diff options
Diffstat (limited to 'drivers/mmc/host/sdhci.c')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 5003 |
1 files changed, 5003 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c new file mode 100644 index 000000000..ad73d528a --- /dev/null +++ b/drivers/mmc/host/sdhci.c @@ -0,0 +1,5003 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver + * + * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. + * + * Thanks to the following companies for their support: + * + * - JMicron (hardware and technical support) + */ + +#include <linux/bitfield.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/ktime.h> +#include <linux/highmem.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/scatterlist.h> +#include <linux/sizes.h> +#include <linux/regulator/consumer.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> + +#include <linux/leds.h> + +#include <linux/mmc/mmc.h> +#include <linux/mmc/host.h> +#include <linux/mmc/card.h> +#include <linux/mmc/sdio.h> +#include <linux/mmc/slot-gpio.h> + +#include "sdhci.h" + +#define DRIVER_NAME "sdhci" + +#define DBG(f, x...) \ + pr_debug("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x) + +#define SDHCI_DUMP(f, x...) \ + pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x) + +#define MAX_TUNING_LOOP 40 + +static unsigned int debug_quirks = 0; +static unsigned int debug_quirks2; + +static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable); + +static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd); + +void sdhci_dumpregs(struct sdhci_host *host) +{ + SDHCI_DUMP("============ SDHCI REGISTER DUMP ===========\n"); + + SDHCI_DUMP("Sys addr: 0x%08x | Version: 0x%08x\n", + sdhci_readl(host, SDHCI_DMA_ADDRESS), + sdhci_readw(host, SDHCI_HOST_VERSION)); + SDHCI_DUMP("Blk size: 0x%08x | Blk cnt: 0x%08x\n", + sdhci_readw(host, SDHCI_BLOCK_SIZE), + sdhci_readw(host, SDHCI_BLOCK_COUNT)); + SDHCI_DUMP("Argument: 0x%08x | Trn mode: 0x%08x\n", + sdhci_readl(host, SDHCI_ARGUMENT), + sdhci_readw(host, SDHCI_TRANSFER_MODE)); + SDHCI_DUMP("Present: 0x%08x | Host ctl: 0x%08x\n", + sdhci_readl(host, SDHCI_PRESENT_STATE), + sdhci_readb(host, SDHCI_HOST_CONTROL)); + SDHCI_DUMP("Power: 0x%08x | Blk gap: 0x%08x\n", + sdhci_readb(host, SDHCI_POWER_CONTROL), + sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL)); + SDHCI_DUMP("Wake-up: 0x%08x | Clock: 0x%08x\n", + sdhci_readb(host, SDHCI_WAKE_UP_CONTROL), + sdhci_readw(host, SDHCI_CLOCK_CONTROL)); + SDHCI_DUMP("Timeout: 0x%08x | Int stat: 0x%08x\n", + sdhci_readb(host, SDHCI_TIMEOUT_CONTROL), + sdhci_readl(host, SDHCI_INT_STATUS)); + SDHCI_DUMP("Int enab: 0x%08x | Sig enab: 0x%08x\n", + sdhci_readl(host, SDHCI_INT_ENABLE), + sdhci_readl(host, SDHCI_SIGNAL_ENABLE)); + SDHCI_DUMP("ACmd stat: 0x%08x | Slot int: 0x%08x\n", + sdhci_readw(host, SDHCI_AUTO_CMD_STATUS), + sdhci_readw(host, SDHCI_SLOT_INT_STATUS)); + SDHCI_DUMP("Caps: 0x%08x | Caps_1: 0x%08x\n", + sdhci_readl(host, SDHCI_CAPABILITIES), + sdhci_readl(host, SDHCI_CAPABILITIES_1)); + SDHCI_DUMP("Cmd: 0x%08x | Max curr: 0x%08x\n", + sdhci_readw(host, SDHCI_COMMAND), + sdhci_readl(host, SDHCI_MAX_CURRENT)); + SDHCI_DUMP("Resp[0]: 0x%08x | Resp[1]: 0x%08x\n", + sdhci_readl(host, SDHCI_RESPONSE), + sdhci_readl(host, SDHCI_RESPONSE + 4)); + SDHCI_DUMP("Resp[2]: 0x%08x | Resp[3]: 0x%08x\n", + sdhci_readl(host, SDHCI_RESPONSE + 8), + sdhci_readl(host, SDHCI_RESPONSE + 12)); + SDHCI_DUMP("Host ctl2: 0x%08x\n", + sdhci_readw(host, SDHCI_HOST_CONTROL2)); + + if (host->flags & SDHCI_USE_ADMA) { + if (host->flags & SDHCI_USE_64_BIT_DMA) { + SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n", + sdhci_readl(host, SDHCI_ADMA_ERROR), + sdhci_readl(host, SDHCI_ADMA_ADDRESS_HI), + sdhci_readl(host, SDHCI_ADMA_ADDRESS)); + } else { + SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n", + sdhci_readl(host, SDHCI_ADMA_ERROR), + sdhci_readl(host, SDHCI_ADMA_ADDRESS)); + } + } + + if (host->ops->dump_vendor_regs) + host->ops->dump_vendor_regs(host); + + SDHCI_DUMP("============================================\n"); +} +EXPORT_SYMBOL_GPL(sdhci_dumpregs); + +/*****************************************************************************\ + * * + * Low level functions * + * * +\*****************************************************************************/ + +static void sdhci_do_enable_v4_mode(struct sdhci_host *host) +{ + u16 ctrl2; + + ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (ctrl2 & SDHCI_CTRL_V4_MODE) + return; + + ctrl2 |= SDHCI_CTRL_V4_MODE; + sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2); +} + +/* + * This can be called before sdhci_add_host() by Vendor's host controller + * driver to enable v4 mode if supported. + */ +void sdhci_enable_v4_mode(struct sdhci_host *host) +{ + host->v4_mode = true; + sdhci_do_enable_v4_mode(host); +} +EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode); + +static inline bool sdhci_data_line_cmd(struct mmc_command *cmd) +{ + return cmd->data || cmd->flags & MMC_RSP_BUSY; +} + +static void sdhci_set_card_detection(struct sdhci_host *host, bool enable) +{ + u32 present; + + if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) || + !mmc_card_is_removable(host->mmc) || mmc_can_gpio_cd(host->mmc)) + return; + + if (enable) { + present = sdhci_readl(host, SDHCI_PRESENT_STATE) & + SDHCI_CARD_PRESENT; + + host->ier |= present ? SDHCI_INT_CARD_REMOVE : + SDHCI_INT_CARD_INSERT; + } else { + host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT); + } + + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); +} + +static void sdhci_enable_card_detection(struct sdhci_host *host) +{ + sdhci_set_card_detection(host, true); +} + +static void sdhci_disable_card_detection(struct sdhci_host *host) +{ + sdhci_set_card_detection(host, false); +} + +static void sdhci_runtime_pm_bus_on(struct sdhci_host *host) +{ + if (host->bus_on) + return; + host->bus_on = true; + pm_runtime_get_noresume(mmc_dev(host->mmc)); +} + +static void sdhci_runtime_pm_bus_off(struct sdhci_host *host) +{ + if (!host->bus_on) + return; + host->bus_on = false; + pm_runtime_put_noidle(mmc_dev(host->mmc)); +} + +void sdhci_reset(struct sdhci_host *host, u8 mask) +{ + ktime_t timeout; + + sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET); + + if (mask & SDHCI_RESET_ALL) { + host->clock = 0; + /* Reset-all turns off SD Bus Power */ + if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) + sdhci_runtime_pm_bus_off(host); + } + + /* Wait max 100 ms */ + timeout = ktime_add_ms(ktime_get(), 100); + + /* hw clears the bit when it's done */ + while (1) { + bool timedout = ktime_after(ktime_get(), timeout); + + if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask)) + break; + if (timedout) { + pr_err("%s: Reset 0x%x never completed.\n", + mmc_hostname(host->mmc), (int)mask); + sdhci_err_stats_inc(host, CTRL_TIMEOUT); + sdhci_dumpregs(host); + return; + } + udelay(10); + } +} +EXPORT_SYMBOL_GPL(sdhci_reset); + +static bool sdhci_do_reset(struct sdhci_host *host, u8 mask) +{ + if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) { + struct mmc_host *mmc = host->mmc; + + if (!mmc->ops->get_cd(mmc)) + return false; + } + + host->ops->reset(host, mask); + + return true; +} + +static void sdhci_reset_for_all(struct sdhci_host *host) +{ + if (sdhci_do_reset(host, SDHCI_RESET_ALL)) { + if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { + if (host->ops->enable_dma) + host->ops->enable_dma(host); + } + /* Resetting the controller clears many */ + host->preset_enabled = false; + } +} + +enum sdhci_reset_reason { + SDHCI_RESET_FOR_INIT, + SDHCI_RESET_FOR_REQUEST_ERROR, + SDHCI_RESET_FOR_REQUEST_ERROR_DATA_ONLY, + SDHCI_RESET_FOR_TUNING_ABORT, + SDHCI_RESET_FOR_CARD_REMOVED, + SDHCI_RESET_FOR_CQE_RECOVERY, +}; + +static void sdhci_reset_for_reason(struct sdhci_host *host, enum sdhci_reset_reason reason) +{ + if (host->quirks2 & SDHCI_QUIRK2_ISSUE_CMD_DAT_RESET_TOGETHER) { + sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); + return; + } + + switch (reason) { + case SDHCI_RESET_FOR_INIT: + sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); + break; + case SDHCI_RESET_FOR_REQUEST_ERROR: + case SDHCI_RESET_FOR_TUNING_ABORT: + case SDHCI_RESET_FOR_CARD_REMOVED: + case SDHCI_RESET_FOR_CQE_RECOVERY: + sdhci_do_reset(host, SDHCI_RESET_CMD); + sdhci_do_reset(host, SDHCI_RESET_DATA); + break; + case SDHCI_RESET_FOR_REQUEST_ERROR_DATA_ONLY: + sdhci_do_reset(host, SDHCI_RESET_DATA); + break; + } +} + +#define sdhci_reset_for(h, r) sdhci_reset_for_reason((h), SDHCI_RESET_FOR_##r) + +static void sdhci_set_default_irqs(struct sdhci_host *host) +{ + host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT | + SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | + SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC | + SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END | + SDHCI_INT_RESPONSE; + + if (host->tuning_mode == SDHCI_TUNING_MODE_2 || + host->tuning_mode == SDHCI_TUNING_MODE_3) + host->ier |= SDHCI_INT_RETUNE; + + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); +} + +static void sdhci_config_dma(struct sdhci_host *host) +{ + u8 ctrl; + u16 ctrl2; + + if (host->version < SDHCI_SPEC_200) + return; + + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + + /* + * Always adjust the DMA selection as some controllers + * (e.g. JMicron) can't do PIO properly when the selection + * is ADMA. + */ + ctrl &= ~SDHCI_CTRL_DMA_MASK; + if (!(host->flags & SDHCI_REQ_USE_DMA)) + goto out; + + /* Note if DMA Select is zero then SDMA is selected */ + if (host->flags & SDHCI_USE_ADMA) + ctrl |= SDHCI_CTRL_ADMA32; + + if (host->flags & SDHCI_USE_64_BIT_DMA) { + /* + * If v4 mode, all supported DMA can be 64-bit addressing if + * controller supports 64-bit system address, otherwise only + * ADMA can support 64-bit addressing. + */ + if (host->v4_mode) { + ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + ctrl2 |= SDHCI_CTRL_64BIT_ADDR; + sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2); + } else if (host->flags & SDHCI_USE_ADMA) { + /* + * Don't need to undo SDHCI_CTRL_ADMA32 in order to + * set SDHCI_CTRL_ADMA64. + */ + ctrl |= SDHCI_CTRL_ADMA64; + } + } + +out: + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); +} + +static void sdhci_init(struct sdhci_host *host, int soft) +{ + struct mmc_host *mmc = host->mmc; + unsigned long flags; + + if (soft) + sdhci_reset_for(host, INIT); + else + sdhci_reset_for_all(host); + + if (host->v4_mode) + sdhci_do_enable_v4_mode(host); + + spin_lock_irqsave(&host->lock, flags); + sdhci_set_default_irqs(host); + spin_unlock_irqrestore(&host->lock, flags); + + host->cqe_on = false; + + if (soft) { + /* force clock reconfiguration */ + host->clock = 0; + host->reinit_uhs = true; + mmc->ops->set_ios(mmc, &mmc->ios); + } +} + +static void sdhci_reinit(struct sdhci_host *host) +{ + u32 cd = host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT); + + sdhci_init(host, 0); + sdhci_enable_card_detection(host); + + /* + * A change to the card detect bits indicates a change in present state, + * refer sdhci_set_card_detection(). A card detect interrupt might have + * been missed while the host controller was being reset, so trigger a + * rescan to check. + */ + if (cd != (host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT))) + mmc_detect_change(host->mmc, msecs_to_jiffies(200)); +} + +static void __sdhci_led_activate(struct sdhci_host *host) +{ + u8 ctrl; + + if (host->quirks & SDHCI_QUIRK_NO_LED) + return; + + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + ctrl |= SDHCI_CTRL_LED; + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); +} + +static void __sdhci_led_deactivate(struct sdhci_host *host) +{ + u8 ctrl; + + if (host->quirks & SDHCI_QUIRK_NO_LED) + return; + + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + ctrl &= ~SDHCI_CTRL_LED; + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); +} + +#if IS_REACHABLE(CONFIG_LEDS_CLASS) +static void sdhci_led_control(struct led_classdev *led, + enum led_brightness brightness) +{ + struct sdhci_host *host = container_of(led, struct sdhci_host, led); + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + + if (host->runtime_suspended) + goto out; + + if (brightness == LED_OFF) + __sdhci_led_deactivate(host); + else + __sdhci_led_activate(host); +out: + spin_unlock_irqrestore(&host->lock, flags); +} + +static int sdhci_led_register(struct sdhci_host *host) +{ + struct mmc_host *mmc = host->mmc; + + if (host->quirks & SDHCI_QUIRK_NO_LED) + return 0; + + snprintf(host->led_name, sizeof(host->led_name), + "%s::", mmc_hostname(mmc)); + + host->led.name = host->led_name; + host->led.brightness = LED_OFF; + host->led.default_trigger = mmc_hostname(mmc); + host->led.brightness_set = sdhci_led_control; + + return led_classdev_register(mmc_dev(mmc), &host->led); +} + +static void sdhci_led_unregister(struct sdhci_host *host) +{ + if (host->quirks & SDHCI_QUIRK_NO_LED) + return; + + led_classdev_unregister(&host->led); +} + +static inline void sdhci_led_activate(struct sdhci_host *host) +{ +} + +static inline void sdhci_led_deactivate(struct sdhci_host *host) +{ +} + +#else + +static inline int sdhci_led_register(struct sdhci_host *host) +{ + return 0; +} + +static inline void sdhci_led_unregister(struct sdhci_host *host) +{ +} + +static inline void sdhci_led_activate(struct sdhci_host *host) +{ + __sdhci_led_activate(host); +} + +static inline void sdhci_led_deactivate(struct sdhci_host *host) +{ + __sdhci_led_deactivate(host); +} + +#endif + +static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq, + unsigned long timeout) +{ + if (sdhci_data_line_cmd(mrq->cmd)) + mod_timer(&host->data_timer, timeout); + else + mod_timer(&host->timer, timeout); +} + +static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq) +{ + if (sdhci_data_line_cmd(mrq->cmd)) + del_timer(&host->data_timer); + else + del_timer(&host->timer); +} + +static inline bool sdhci_has_requests(struct sdhci_host *host) +{ + return host->cmd || host->data_cmd; +} + +/*****************************************************************************\ + * * + * Core functions * + * * +\*****************************************************************************/ + +static void sdhci_read_block_pio(struct sdhci_host *host) +{ + unsigned long flags; + size_t blksize, len, chunk; + u32 scratch; + u8 *buf; + + DBG("PIO reading\n"); + + blksize = host->data->blksz; + chunk = 0; + + local_irq_save(flags); + + while (blksize) { + BUG_ON(!sg_miter_next(&host->sg_miter)); + + len = min(host->sg_miter.length, blksize); + + blksize -= len; + host->sg_miter.consumed = len; + + buf = host->sg_miter.addr; + + while (len) { + if (chunk == 0) { + scratch = sdhci_readl(host, SDHCI_BUFFER); + chunk = 4; + } + + *buf = scratch & 0xFF; + + buf++; + scratch >>= 8; + chunk--; + len--; + } + } + + sg_miter_stop(&host->sg_miter); + + local_irq_restore(flags); +} + +static void sdhci_write_block_pio(struct sdhci_host *host) +{ + unsigned long flags; + size_t blksize, len, chunk; + u32 scratch; + u8 *buf; + + DBG("PIO writing\n"); + + blksize = host->data->blksz; + chunk = 0; + scratch = 0; + + local_irq_save(flags); + + while (blksize) { + BUG_ON(!sg_miter_next(&host->sg_miter)); + + len = min(host->sg_miter.length, blksize); + + blksize -= len; + host->sg_miter.consumed = len; + + buf = host->sg_miter.addr; + + while (len) { + scratch |= (u32)*buf << (chunk * 8); + + buf++; + chunk++; + len--; + + if ((chunk == 4) || ((len == 0) && (blksize == 0))) { + sdhci_writel(host, scratch, SDHCI_BUFFER); + chunk = 0; + scratch = 0; + } + } + } + + sg_miter_stop(&host->sg_miter); + + local_irq_restore(flags); +} + +static void sdhci_transfer_pio(struct sdhci_host *host) +{ + u32 mask; + + if (host->blocks == 0) + return; + + if (host->data->flags & MMC_DATA_READ) + mask = SDHCI_DATA_AVAILABLE; + else + mask = SDHCI_SPACE_AVAILABLE; + + /* + * Some controllers (JMicron JMB38x) mess up the buffer bits + * for transfers < 4 bytes. As long as it is just one block, + * we can ignore the bits. + */ + if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) && + (host->data->blocks == 1)) + mask = ~0; + + while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) { + if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY) + udelay(100); + + if (host->data->flags & MMC_DATA_READ) + sdhci_read_block_pio(host); + else + sdhci_write_block_pio(host); + + host->blocks--; + if (host->blocks == 0) + break; + } + + DBG("PIO transfer complete.\n"); +} + +static int sdhci_pre_dma_transfer(struct sdhci_host *host, + struct mmc_data *data, int cookie) +{ + int sg_count; + + /* + * If the data buffers are already mapped, return the previous + * dma_map_sg() result. + */ + if (data->host_cookie == COOKIE_PRE_MAPPED) + return data->sg_count; + + /* Bounce write requests to the bounce buffer */ + if (host->bounce_buffer) { + unsigned int length = data->blksz * data->blocks; + + if (length > host->bounce_buffer_size) { + pr_err("%s: asked for transfer of %u bytes exceeds bounce buffer %u bytes\n", + mmc_hostname(host->mmc), length, + host->bounce_buffer_size); + return -EIO; + } + if (mmc_get_dma_dir(data) == DMA_TO_DEVICE) { + /* Copy the data to the bounce buffer */ + if (host->ops->copy_to_bounce_buffer) { + host->ops->copy_to_bounce_buffer(host, + data, length); + } else { + sg_copy_to_buffer(data->sg, data->sg_len, + host->bounce_buffer, length); + } + } + /* Switch ownership to the DMA */ + dma_sync_single_for_device(mmc_dev(host->mmc), + host->bounce_addr, + host->bounce_buffer_size, + mmc_get_dma_dir(data)); + /* Just a dummy value */ + sg_count = 1; + } else { + /* Just access the data directly from memory */ + sg_count = dma_map_sg(mmc_dev(host->mmc), + data->sg, data->sg_len, + mmc_get_dma_dir(data)); + } + + if (sg_count == 0) + return -ENOSPC; + + data->sg_count = sg_count; + data->host_cookie = cookie; + + return sg_count; +} + +static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags) +{ + local_irq_save(*flags); + return kmap_atomic(sg_page(sg)) + sg->offset; +} + +static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags) +{ + kunmap_atomic(buffer); + local_irq_restore(*flags); +} + +void sdhci_adma_write_desc(struct sdhci_host *host, void **desc, + dma_addr_t addr, int len, unsigned int cmd) +{ + struct sdhci_adma2_64_desc *dma_desc = *desc; + + /* 32-bit and 64-bit descriptors have these members in same position */ + dma_desc->cmd = cpu_to_le16(cmd); + dma_desc->len = cpu_to_le16(len); + dma_desc->addr_lo = cpu_to_le32(lower_32_bits(addr)); + + if (host->flags & SDHCI_USE_64_BIT_DMA) + dma_desc->addr_hi = cpu_to_le32(upper_32_bits(addr)); + + *desc += host->desc_sz; +} +EXPORT_SYMBOL_GPL(sdhci_adma_write_desc); + +static inline void __sdhci_adma_write_desc(struct sdhci_host *host, + void **desc, dma_addr_t addr, + int len, unsigned int cmd) +{ + if (host->ops->adma_write_desc) + host->ops->adma_write_desc(host, desc, addr, len, cmd); + else + sdhci_adma_write_desc(host, desc, addr, len, cmd); +} + +static void sdhci_adma_mark_end(void *desc) +{ + struct sdhci_adma2_64_desc *dma_desc = desc; + + /* 32-bit and 64-bit descriptors have 'cmd' in same position */ + dma_desc->cmd |= cpu_to_le16(ADMA2_END); +} + +static void sdhci_adma_table_pre(struct sdhci_host *host, + struct mmc_data *data, int sg_count) +{ + struct scatterlist *sg; + unsigned long flags; + dma_addr_t addr, align_addr; + void *desc, *align; + char *buffer; + int len, offset, i; + + /* + * The spec does not specify endianness of descriptor table. + * We currently guess that it is LE. + */ + + host->sg_count = sg_count; + + desc = host->adma_table; + align = host->align_buffer; + + align_addr = host->align_addr; + + for_each_sg(data->sg, sg, host->sg_count, i) { + addr = sg_dma_address(sg); + len = sg_dma_len(sg); + + /* + * The SDHCI specification states that ADMA addresses must + * be 32-bit aligned. If they aren't, then we use a bounce + * buffer for the (up to three) bytes that screw up the + * alignment. + */ + offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) & + SDHCI_ADMA2_MASK; + if (offset) { + if (data->flags & MMC_DATA_WRITE) { + buffer = sdhci_kmap_atomic(sg, &flags); + memcpy(align, buffer, offset); + sdhci_kunmap_atomic(buffer, &flags); + } + + /* tran, valid */ + __sdhci_adma_write_desc(host, &desc, align_addr, + offset, ADMA2_TRAN_VALID); + + BUG_ON(offset > 65536); + + align += SDHCI_ADMA2_ALIGN; + align_addr += SDHCI_ADMA2_ALIGN; + + addr += offset; + len -= offset; + } + + /* + * The block layer forces a minimum segment size of PAGE_SIZE, + * so 'len' can be too big here if PAGE_SIZE >= 64KiB. Write + * multiple descriptors, noting that the ADMA table is sized + * for 4KiB chunks anyway, so it will be big enough. + */ + while (len > host->max_adma) { + int n = 32 * 1024; /* 32KiB*/ + + __sdhci_adma_write_desc(host, &desc, addr, n, ADMA2_TRAN_VALID); + addr += n; + len -= n; + } + + /* tran, valid */ + if (len) + __sdhci_adma_write_desc(host, &desc, addr, len, + ADMA2_TRAN_VALID); + + /* + * If this triggers then we have a calculation bug + * somewhere. :/ + */ + WARN_ON((desc - host->adma_table) >= host->adma_table_sz); + } + + if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) { + /* Mark the last descriptor as the terminating descriptor */ + if (desc != host->adma_table) { + desc -= host->desc_sz; + sdhci_adma_mark_end(desc); + } + } else { + /* Add a terminating entry - nop, end, valid */ + __sdhci_adma_write_desc(host, &desc, 0, 0, ADMA2_NOP_END_VALID); + } +} + +static void sdhci_adma_table_post(struct sdhci_host *host, + struct mmc_data *data) +{ + struct scatterlist *sg; + int i, size; + void *align; + char *buffer; + unsigned long flags; + + if (data->flags & MMC_DATA_READ) { + bool has_unaligned = false; + + /* Do a quick scan of the SG list for any unaligned mappings */ + for_each_sg(data->sg, sg, host->sg_count, i) + if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) { + has_unaligned = true; + break; + } + + if (has_unaligned) { + dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg, + data->sg_len, DMA_FROM_DEVICE); + + align = host->align_buffer; + + for_each_sg(data->sg, sg, host->sg_count, i) { + if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) { + size = SDHCI_ADMA2_ALIGN - + (sg_dma_address(sg) & SDHCI_ADMA2_MASK); + + buffer = sdhci_kmap_atomic(sg, &flags); + memcpy(buffer, align, size); + sdhci_kunmap_atomic(buffer, &flags); + + align += SDHCI_ADMA2_ALIGN; + } + } + } + } +} + +static void sdhci_set_adma_addr(struct sdhci_host *host, dma_addr_t addr) +{ + sdhci_writel(host, lower_32_bits(addr), SDHCI_ADMA_ADDRESS); + if (host->flags & SDHCI_USE_64_BIT_DMA) + sdhci_writel(host, upper_32_bits(addr), SDHCI_ADMA_ADDRESS_HI); +} + +static dma_addr_t sdhci_sdma_address(struct sdhci_host *host) +{ + if (host->bounce_buffer) + return host->bounce_addr; + else + return sg_dma_address(host->data->sg); +} + +static void sdhci_set_sdma_addr(struct sdhci_host *host, dma_addr_t addr) +{ + if (host->v4_mode) + sdhci_set_adma_addr(host, addr); + else + sdhci_writel(host, addr, SDHCI_DMA_ADDRESS); +} + +static unsigned int sdhci_target_timeout(struct sdhci_host *host, + struct mmc_command *cmd, + struct mmc_data *data) +{ + unsigned int target_timeout; + + /* timeout in us */ + if (!data) { + target_timeout = cmd->busy_timeout * 1000; + } else { + target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000); + if (host->clock && data->timeout_clks) { + unsigned long long val; + + /* + * data->timeout_clks is in units of clock cycles. + * host->clock is in Hz. target_timeout is in us. + * Hence, us = 1000000 * cycles / Hz. Round up. + */ + val = 1000000ULL * data->timeout_clks; + if (do_div(val, host->clock)) + target_timeout++; + target_timeout += val; + } + } + + return target_timeout; +} + +static void sdhci_calc_sw_timeout(struct sdhci_host *host, + struct mmc_command *cmd) +{ + struct mmc_data *data = cmd->data; + struct mmc_host *mmc = host->mmc; + struct mmc_ios *ios = &mmc->ios; + unsigned char bus_width = 1 << ios->bus_width; + unsigned int blksz; + unsigned int freq; + u64 target_timeout; + u64 transfer_time; + + target_timeout = sdhci_target_timeout(host, cmd, data); + target_timeout *= NSEC_PER_USEC; + + if (data) { + blksz = data->blksz; + freq = mmc->actual_clock ? : host->clock; + transfer_time = (u64)blksz * NSEC_PER_SEC * (8 / bus_width); + do_div(transfer_time, freq); + /* multiply by '2' to account for any unknowns */ + transfer_time = transfer_time * 2; + /* calculate timeout for the entire data */ + host->data_timeout = data->blocks * target_timeout + + transfer_time; + } else { + host->data_timeout = target_timeout; + } + + if (host->data_timeout) + host->data_timeout += MMC_CMD_TRANSFER_TIME; +} + +static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd, + bool *too_big) +{ + u8 count; + struct mmc_data *data; + unsigned target_timeout, current_timeout; + + *too_big = false; + + /* + * If the host controller provides us with an incorrect timeout + * value, just skip the check and use the maximum. The hardware may take + * longer to time out, but that's much better than having a too-short + * timeout value. + */ + if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL) + return host->max_timeout_count; + + /* Unspecified command, assume max */ + if (cmd == NULL) + return host->max_timeout_count; + + data = cmd->data; + /* Unspecified timeout, assume max */ + if (!data && !cmd->busy_timeout) + return host->max_timeout_count; + + /* timeout in us */ + target_timeout = sdhci_target_timeout(host, cmd, data); + + /* + * Figure out needed cycles. + * We do this in steps in order to fit inside a 32 bit int. + * The first step is the minimum timeout, which will have a + * minimum resolution of 6 bits: + * (1) 2^13*1000 > 2^22, + * (2) host->timeout_clk < 2^16 + * => + * (1) / (2) > 2^6 + */ + count = 0; + current_timeout = (1 << 13) * 1000 / host->timeout_clk; + while (current_timeout < target_timeout) { + count++; + current_timeout <<= 1; + if (count > host->max_timeout_count) { + if (!(host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT)) + DBG("Too large timeout 0x%x requested for CMD%d!\n", + count, cmd->opcode); + count = host->max_timeout_count; + *too_big = true; + break; + } + } + + return count; +} + +static void sdhci_set_transfer_irqs(struct sdhci_host *host) +{ + u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL; + u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR; + + if (host->flags & SDHCI_REQ_USE_DMA) + host->ier = (host->ier & ~pio_irqs) | dma_irqs; + else + host->ier = (host->ier & ~dma_irqs) | pio_irqs; + + if (host->flags & (SDHCI_AUTO_CMD23 | SDHCI_AUTO_CMD12)) + host->ier |= SDHCI_INT_AUTO_CMD_ERR; + else + host->ier &= ~SDHCI_INT_AUTO_CMD_ERR; + + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); +} + +void sdhci_set_data_timeout_irq(struct sdhci_host *host, bool enable) +{ + if (enable) + host->ier |= SDHCI_INT_DATA_TIMEOUT; + else + host->ier &= ~SDHCI_INT_DATA_TIMEOUT; + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); +} +EXPORT_SYMBOL_GPL(sdhci_set_data_timeout_irq); + +void __sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd) +{ + bool too_big = false; + u8 count = sdhci_calc_timeout(host, cmd, &too_big); + + if (too_big && + host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) { + sdhci_calc_sw_timeout(host, cmd); + sdhci_set_data_timeout_irq(host, false); + } else if (!(host->ier & SDHCI_INT_DATA_TIMEOUT)) { + sdhci_set_data_timeout_irq(host, true); + } + + sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL); +} +EXPORT_SYMBOL_GPL(__sdhci_set_timeout); + +static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd) +{ + if (host->ops->set_timeout) + host->ops->set_timeout(host, cmd); + else + __sdhci_set_timeout(host, cmd); +} + +static void sdhci_initialize_data(struct sdhci_host *host, + struct mmc_data *data) +{ + WARN_ON(host->data); + + /* Sanity checks */ + BUG_ON(data->blksz * data->blocks > 524288); + BUG_ON(data->blksz > host->mmc->max_blk_size); + BUG_ON(data->blocks > 65535); + + host->data = data; + host->data_early = 0; + host->data->bytes_xfered = 0; +} + +static inline void sdhci_set_block_info(struct sdhci_host *host, + struct mmc_data *data) +{ + /* Set the DMA boundary value and block size */ + sdhci_writew(host, + SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz), + SDHCI_BLOCK_SIZE); + /* + * For Version 4.10 onwards, if v4 mode is enabled, 32-bit Block Count + * can be supported, in that case 16-bit block count register must be 0. + */ + if (host->version >= SDHCI_SPEC_410 && host->v4_mode && + (host->quirks2 & SDHCI_QUIRK2_USE_32BIT_BLK_CNT)) { + if (sdhci_readw(host, SDHCI_BLOCK_COUNT)) + sdhci_writew(host, 0, SDHCI_BLOCK_COUNT); + sdhci_writew(host, data->blocks, SDHCI_32BIT_BLK_CNT); + } else { + sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT); + } +} + +static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) +{ + struct mmc_data *data = cmd->data; + + sdhci_initialize_data(host, data); + + if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { + struct scatterlist *sg; + unsigned int length_mask, offset_mask; + int i; + + host->flags |= SDHCI_REQ_USE_DMA; + + /* + * FIXME: This doesn't account for merging when mapping the + * scatterlist. + * + * The assumption here being that alignment and lengths are + * the same after DMA mapping to device address space. + */ + length_mask = 0; + offset_mask = 0; + if (host->flags & SDHCI_USE_ADMA) { + if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) { + length_mask = 3; + /* + * As we use up to 3 byte chunks to work + * around alignment problems, we need to + * check the offset as well. + */ + offset_mask = 3; + } + } else { + if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE) + length_mask = 3; + if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) + offset_mask = 3; + } + + if (unlikely(length_mask | offset_mask)) { + for_each_sg(data->sg, sg, data->sg_len, i) { + if (sg->length & length_mask) { + DBG("Reverting to PIO because of transfer size (%d)\n", + sg->length); + host->flags &= ~SDHCI_REQ_USE_DMA; + break; + } + if (sg->offset & offset_mask) { + DBG("Reverting to PIO because of bad alignment\n"); + host->flags &= ~SDHCI_REQ_USE_DMA; + break; + } + } + } + } + + sdhci_config_dma(host); + + if (host->flags & SDHCI_REQ_USE_DMA) { + int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED); + + if (sg_cnt <= 0) { + /* + * This only happens when someone fed + * us an invalid request. + */ + WARN_ON(1); + host->flags &= ~SDHCI_REQ_USE_DMA; + } else if (host->flags & SDHCI_USE_ADMA) { + sdhci_adma_table_pre(host, data, sg_cnt); + sdhci_set_adma_addr(host, host->adma_addr); + } else { + WARN_ON(sg_cnt != 1); + sdhci_set_sdma_addr(host, sdhci_sdma_address(host)); + } + } + + if (!(host->flags & SDHCI_REQ_USE_DMA)) { + int flags; + + flags = SG_MITER_ATOMIC; + if (host->data->flags & MMC_DATA_READ) + flags |= SG_MITER_TO_SG; + else + flags |= SG_MITER_FROM_SG; + sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); + host->blocks = data->blocks; + } + + sdhci_set_transfer_irqs(host); + + sdhci_set_block_info(host, data); +} + +#if IS_ENABLED(CONFIG_MMC_SDHCI_EXTERNAL_DMA) + +static int sdhci_external_dma_init(struct sdhci_host *host) +{ + int ret = 0; + struct mmc_host *mmc = host->mmc; + + host->tx_chan = dma_request_chan(mmc_dev(mmc), "tx"); + if (IS_ERR(host->tx_chan)) { + ret = PTR_ERR(host->tx_chan); + if (ret != -EPROBE_DEFER) + pr_warn("Failed to request TX DMA channel.\n"); + host->tx_chan = NULL; + return ret; + } + + host->rx_chan = dma_request_chan(mmc_dev(mmc), "rx"); + if (IS_ERR(host->rx_chan)) { + if (host->tx_chan) { + dma_release_channel(host->tx_chan); + host->tx_chan = NULL; + } + + ret = PTR_ERR(host->rx_chan); + if (ret != -EPROBE_DEFER) + pr_warn("Failed to request RX DMA channel.\n"); + host->rx_chan = NULL; + } + + return ret; +} + +static struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host, + struct mmc_data *data) +{ + return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan; +} + +static int sdhci_external_dma_setup(struct sdhci_host *host, + struct mmc_command *cmd) +{ + int ret, i; + enum dma_transfer_direction dir; + struct dma_async_tx_descriptor *desc; + struct mmc_data *data = cmd->data; + struct dma_chan *chan; + struct dma_slave_config cfg; + dma_cookie_t cookie; + int sg_cnt; + + if (!host->mapbase) + return -EINVAL; + + memset(&cfg, 0, sizeof(cfg)); + cfg.src_addr = host->mapbase + SDHCI_BUFFER; + cfg.dst_addr = host->mapbase + SDHCI_BUFFER; + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + cfg.src_maxburst = data->blksz / 4; + cfg.dst_maxburst = data->blksz / 4; + + /* Sanity check: all the SG entries must be aligned by block size. */ + for (i = 0; i < data->sg_len; i++) { + if ((data->sg + i)->length % data->blksz) + return -EINVAL; + } + + chan = sdhci_external_dma_channel(host, data); + + ret = dmaengine_slave_config(chan, &cfg); + if (ret) + return ret; + + sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED); + if (sg_cnt <= 0) + return -EINVAL; + + dir = data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; + desc = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, dir, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc) + return -EINVAL; + + desc->callback = NULL; + desc->callback_param = NULL; + + cookie = dmaengine_submit(desc); + if (dma_submit_error(cookie)) + ret = cookie; + + return ret; +} + +static void sdhci_external_dma_release(struct sdhci_host *host) +{ + if (host->tx_chan) { + dma_release_channel(host->tx_chan); + host->tx_chan = NULL; + } + + if (host->rx_chan) { + dma_release_channel(host->rx_chan); + host->rx_chan = NULL; + } + + sdhci_switch_external_dma(host, false); +} + +static void __sdhci_external_dma_prepare_data(struct sdhci_host *host, + struct mmc_command *cmd) +{ + struct mmc_data *data = cmd->data; + + sdhci_initialize_data(host, data); + + host->flags |= SDHCI_REQ_USE_DMA; + sdhci_set_transfer_irqs(host); + + sdhci_set_block_info(host, data); +} + +static void sdhci_external_dma_prepare_data(struct sdhci_host *host, + struct mmc_command *cmd) +{ + if (!sdhci_external_dma_setup(host, cmd)) { + __sdhci_external_dma_prepare_data(host, cmd); + } else { + sdhci_external_dma_release(host); + pr_err("%s: Cannot use external DMA, switch to the DMA/PIO which standard SDHCI provides.\n", + mmc_hostname(host->mmc)); + sdhci_prepare_data(host, cmd); + } +} + +static void sdhci_external_dma_pre_transfer(struct sdhci_host *host, + struct mmc_command *cmd) +{ + struct dma_chan *chan; + + if (!cmd->data) + return; + + chan = sdhci_external_dma_channel(host, cmd->data); + if (chan) + dma_async_issue_pending(chan); +} + +#else + +static inline int sdhci_external_dma_init(struct sdhci_host *host) +{ + return -EOPNOTSUPP; +} + +static inline void sdhci_external_dma_release(struct sdhci_host *host) +{ +} + +static inline void sdhci_external_dma_prepare_data(struct sdhci_host *host, + struct mmc_command *cmd) +{ + /* This should never happen */ + WARN_ON_ONCE(1); +} + +static inline void sdhci_external_dma_pre_transfer(struct sdhci_host *host, + struct mmc_command *cmd) +{ +} + +static inline struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host, + struct mmc_data *data) +{ + return NULL; +} + +#endif + +void sdhci_switch_external_dma(struct sdhci_host *host, bool en) +{ + host->use_external_dma = en; +} +EXPORT_SYMBOL_GPL(sdhci_switch_external_dma); + +static inline bool sdhci_auto_cmd12(struct sdhci_host *host, + struct mmc_request *mrq) +{ + return !mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) && + !mrq->cap_cmd_during_tfr; +} + +static inline bool sdhci_auto_cmd23(struct sdhci_host *host, + struct mmc_request *mrq) +{ + return mrq->sbc && (host->flags & SDHCI_AUTO_CMD23); +} + +static inline bool sdhci_manual_cmd23(struct sdhci_host *host, + struct mmc_request *mrq) +{ + return mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23); +} + +static inline void sdhci_auto_cmd_select(struct sdhci_host *host, + struct mmc_command *cmd, + u16 *mode) +{ + bool use_cmd12 = sdhci_auto_cmd12(host, cmd->mrq) && + (cmd->opcode != SD_IO_RW_EXTENDED); + bool use_cmd23 = sdhci_auto_cmd23(host, cmd->mrq); + u16 ctrl2; + + /* + * In case of Version 4.10 or later, use of 'Auto CMD Auto + * Select' is recommended rather than use of 'Auto CMD12 + * Enable' or 'Auto CMD23 Enable'. We require Version 4 Mode + * here because some controllers (e.g sdhci-of-dwmshc) expect it. + */ + if (host->version >= SDHCI_SPEC_410 && host->v4_mode && + (use_cmd12 || use_cmd23)) { + *mode |= SDHCI_TRNS_AUTO_SEL; + + ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (use_cmd23) + ctrl2 |= SDHCI_CMD23_ENABLE; + else + ctrl2 &= ~SDHCI_CMD23_ENABLE; + sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2); + + return; + } + + /* + * If we are sending CMD23, CMD12 never gets sent + * on successful completion (so no Auto-CMD12). + */ + if (use_cmd12) + *mode |= SDHCI_TRNS_AUTO_CMD12; + else if (use_cmd23) + *mode |= SDHCI_TRNS_AUTO_CMD23; +} + +static void sdhci_set_transfer_mode(struct sdhci_host *host, + struct mmc_command *cmd) +{ + u16 mode = 0; + struct mmc_data *data = cmd->data; + + if (data == NULL) { + if (host->quirks2 & + SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) { + /* must not clear SDHCI_TRANSFER_MODE when tuning */ + if (cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) + sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE); + } else { + /* clear Auto CMD settings for no data CMDs */ + mode = sdhci_readw(host, SDHCI_TRANSFER_MODE); + sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 | + SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE); + } + return; + } + + WARN_ON(!host->data); + + if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE)) + mode = SDHCI_TRNS_BLK_CNT_EN; + + if (mmc_op_multi(cmd->opcode) || data->blocks > 1) { + mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI; + sdhci_auto_cmd_select(host, cmd, &mode); + if (sdhci_auto_cmd23(host, cmd->mrq)) + sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2); + } + + if (data->flags & MMC_DATA_READ) + mode |= SDHCI_TRNS_READ; + if (host->flags & SDHCI_REQ_USE_DMA) + mode |= SDHCI_TRNS_DMA; + + sdhci_writew(host, mode, SDHCI_TRANSFER_MODE); +} + +static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq) +{ + return (!(host->flags & SDHCI_DEVICE_DEAD) && + ((mrq->cmd && mrq->cmd->error) || + (mrq->sbc && mrq->sbc->error) || + (mrq->data && mrq->data->stop && mrq->data->stop->error) || + (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))); +} + +static void sdhci_set_mrq_done(struct sdhci_host *host, struct mmc_request *mrq) +{ + int i; + + for (i = 0; i < SDHCI_MAX_MRQS; i++) { + if (host->mrqs_done[i] == mrq) { + WARN_ON(1); + return; + } + } + + for (i = 0; i < SDHCI_MAX_MRQS; i++) { + if (!host->mrqs_done[i]) { + host->mrqs_done[i] = mrq; + break; + } + } + + WARN_ON(i >= SDHCI_MAX_MRQS); +} + +static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq) +{ + if (host->cmd && host->cmd->mrq == mrq) + host->cmd = NULL; + + if (host->data_cmd && host->data_cmd->mrq == mrq) + host->data_cmd = NULL; + + if (host->deferred_cmd && host->deferred_cmd->mrq == mrq) + host->deferred_cmd = NULL; + + if (host->data && host->data->mrq == mrq) + host->data = NULL; + + if (sdhci_needs_reset(host, mrq)) + host->pending_reset = true; + + sdhci_set_mrq_done(host, mrq); + + sdhci_del_timer(host, mrq); + + if (!sdhci_has_requests(host)) + sdhci_led_deactivate(host); +} + +static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq) +{ + __sdhci_finish_mrq(host, mrq); + + queue_work(host->complete_wq, &host->complete_work); +} + +static void __sdhci_finish_data(struct sdhci_host *host, bool sw_data_timeout) +{ + struct mmc_command *data_cmd = host->data_cmd; + struct mmc_data *data = host->data; + + host->data = NULL; + host->data_cmd = NULL; + + /* + * The controller needs a reset of internal state machines upon error + * conditions. + */ + if (data->error) { + if (!host->cmd || host->cmd == data_cmd) + sdhci_reset_for(host, REQUEST_ERROR); + else + sdhci_reset_for(host, REQUEST_ERROR_DATA_ONLY); + } + + if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) == + (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) + sdhci_adma_table_post(host, data); + + /* + * The specification states that the block count register must + * be updated, but it does not specify at what point in the + * data flow. That makes the register entirely useless to read + * back so we have to assume that nothing made it to the card + * in the event of an error. + */ + if (data->error) + data->bytes_xfered = 0; + else + data->bytes_xfered = data->blksz * data->blocks; + + /* + * Need to send CMD12 if - + * a) open-ended multiblock transfer not using auto CMD12 (no CMD23) + * b) error in multiblock transfer + */ + if (data->stop && + ((!data->mrq->sbc && !sdhci_auto_cmd12(host, data->mrq)) || + data->error)) { + /* + * 'cap_cmd_during_tfr' request must not use the command line + * after mmc_command_done() has been called. It is upper layer's + * responsibility to send the stop command if required. + */ + if (data->mrq->cap_cmd_during_tfr) { + __sdhci_finish_mrq(host, data->mrq); + } else { + /* Avoid triggering warning in sdhci_send_command() */ + host->cmd = NULL; + if (!sdhci_send_command(host, data->stop)) { + if (sw_data_timeout) { + /* + * This is anyway a sw data timeout, so + * give up now. + */ + data->stop->error = -EIO; + __sdhci_finish_mrq(host, data->mrq); + } else { + WARN_ON(host->deferred_cmd); + host->deferred_cmd = data->stop; + } + } + } + } else { + __sdhci_finish_mrq(host, data->mrq); + } +} + +static void sdhci_finish_data(struct sdhci_host *host) +{ + __sdhci_finish_data(host, false); +} + +static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) +{ + int flags; + u32 mask; + unsigned long timeout; + + WARN_ON(host->cmd); + + /* Initially, a command has no error */ + cmd->error = 0; + + if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) && + cmd->opcode == MMC_STOP_TRANSMISSION) + cmd->flags |= MMC_RSP_BUSY; + + mask = SDHCI_CMD_INHIBIT; + if (sdhci_data_line_cmd(cmd)) + mask |= SDHCI_DATA_INHIBIT; + + /* We shouldn't wait for data inihibit for stop commands, even + though they might use busy signaling */ + if (cmd->mrq->data && (cmd == cmd->mrq->data->stop)) + mask &= ~SDHCI_DATA_INHIBIT; + + if (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) + return false; + + host->cmd = cmd; + host->data_timeout = 0; + if (sdhci_data_line_cmd(cmd)) { + WARN_ON(host->data_cmd); + host->data_cmd = cmd; + sdhci_set_timeout(host, cmd); + } + + if (cmd->data) { + if (host->use_external_dma) + sdhci_external_dma_prepare_data(host, cmd); + else + sdhci_prepare_data(host, cmd); + } + + sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT); + + sdhci_set_transfer_mode(host, cmd); + + if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) { + WARN_ONCE(1, "Unsupported response type!\n"); + /* + * This does not happen in practice because 136-bit response + * commands never have busy waiting, so rather than complicate + * the error path, just remove busy waiting and continue. + */ + cmd->flags &= ~MMC_RSP_BUSY; + } + + if (!(cmd->flags & MMC_RSP_PRESENT)) + flags = SDHCI_CMD_RESP_NONE; + else if (cmd->flags & MMC_RSP_136) + flags = SDHCI_CMD_RESP_LONG; + else if (cmd->flags & MMC_RSP_BUSY) + flags = SDHCI_CMD_RESP_SHORT_BUSY; + else + flags = SDHCI_CMD_RESP_SHORT; + + if (cmd->flags & MMC_RSP_CRC) + flags |= SDHCI_CMD_CRC; + if (cmd->flags & MMC_RSP_OPCODE) + flags |= SDHCI_CMD_INDEX; + + /* CMD19 is special in that the Data Present Select should be set */ + if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK || + cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200) + flags |= SDHCI_CMD_DATA; + + timeout = jiffies; + if (host->data_timeout) + timeout += nsecs_to_jiffies(host->data_timeout); + else if (!cmd->data && cmd->busy_timeout > 9000) + timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ; + else + timeout += 10 * HZ; + sdhci_mod_timer(host, cmd->mrq, timeout); + + if (host->use_external_dma) + sdhci_external_dma_pre_transfer(host, cmd); + + sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND); + + return true; +} + +static bool sdhci_present_error(struct sdhci_host *host, + struct mmc_command *cmd, bool present) +{ + if (!present || host->flags & SDHCI_DEVICE_DEAD) { + cmd->error = -ENOMEDIUM; + return true; + } + + return false; +} + +static bool sdhci_send_command_retry(struct sdhci_host *host, + struct mmc_command *cmd, + unsigned long flags) + __releases(host->lock) + __acquires(host->lock) +{ + struct mmc_command *deferred_cmd = host->deferred_cmd; + int timeout = 10; /* Approx. 10 ms */ + bool present; + + while (!sdhci_send_command(host, cmd)) { + if (!timeout--) { + pr_err("%s: Controller never released inhibit bit(s).\n", + mmc_hostname(host->mmc)); + sdhci_err_stats_inc(host, CTRL_TIMEOUT); + sdhci_dumpregs(host); + cmd->error = -EIO; + return false; + } + + spin_unlock_irqrestore(&host->lock, flags); + + usleep_range(1000, 1250); + + present = host->mmc->ops->get_cd(host->mmc); + + spin_lock_irqsave(&host->lock, flags); + + /* A deferred command might disappear, handle that */ + if (cmd == deferred_cmd && cmd != host->deferred_cmd) + return true; + + if (sdhci_present_error(host, cmd, present)) + return false; + } + + if (cmd == host->deferred_cmd) + host->deferred_cmd = NULL; + + return true; +} + +static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd) +{ + int i, reg; + + for (i = 0; i < 4; i++) { + reg = SDHCI_RESPONSE + (3 - i) * 4; + cmd->resp[i] = sdhci_readl(host, reg); + } + + if (host->quirks2 & SDHCI_QUIRK2_RSP_136_HAS_CRC) + return; + + /* CRC is stripped so we need to do some shifting */ + for (i = 0; i < 4; i++) { + cmd->resp[i] <<= 8; + if (i != 3) + cmd->resp[i] |= cmd->resp[i + 1] >> 24; + } +} + +static void sdhci_finish_command(struct sdhci_host *host) +{ + struct mmc_command *cmd = host->cmd; + + host->cmd = NULL; + + if (cmd->flags & MMC_RSP_PRESENT) { + if (cmd->flags & MMC_RSP_136) { + sdhci_read_rsp_136(host, cmd); + } else { + cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE); + } + } + + if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd) + mmc_command_done(host->mmc, cmd->mrq); + + /* + * The host can send and interrupt when the busy state has + * ended, allowing us to wait without wasting CPU cycles. + * The busy signal uses DAT0 so this is similar to waiting + * for data to complete. + * + * Note: The 1.0 specification is a bit ambiguous about this + * feature so there might be some problems with older + * controllers. + */ + if (cmd->flags & MMC_RSP_BUSY) { + if (cmd->data) { + DBG("Cannot wait for busy signal when also doing a data transfer"); + } else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) && + cmd == host->data_cmd) { + /* Command complete before busy is ended */ + return; + } + } + + /* Finished CMD23, now send actual command. */ + if (cmd == cmd->mrq->sbc) { + if (!sdhci_send_command(host, cmd->mrq->cmd)) { + WARN_ON(host->deferred_cmd); + host->deferred_cmd = cmd->mrq->cmd; + } + } else { + + /* Processed actual command. */ + if (host->data && host->data_early) + sdhci_finish_data(host); + + if (!cmd->data) + __sdhci_finish_mrq(host, cmd->mrq); + } +} + +static u16 sdhci_get_preset_value(struct sdhci_host *host) +{ + u16 preset = 0; + + switch (host->timing) { + case MMC_TIMING_MMC_HS: + case MMC_TIMING_SD_HS: + preset = sdhci_readw(host, SDHCI_PRESET_FOR_HIGH_SPEED); + break; + case MMC_TIMING_UHS_SDR12: + preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12); + break; + case MMC_TIMING_UHS_SDR25: + preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25); + break; + case MMC_TIMING_UHS_SDR50: + preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50); + break; + case MMC_TIMING_UHS_SDR104: + case MMC_TIMING_MMC_HS200: + preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104); + break; + case MMC_TIMING_UHS_DDR50: + case MMC_TIMING_MMC_DDR52: + preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50); + break; + case MMC_TIMING_MMC_HS400: + preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400); + break; + default: + pr_warn("%s: Invalid UHS-I mode selected\n", + mmc_hostname(host->mmc)); + preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12); + break; + } + return preset; +} + +u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock, + unsigned int *actual_clock) +{ + int div = 0; /* Initialized for compiler warning */ + int real_div = div, clk_mul = 1; + u16 clk = 0; + bool switch_base_clk = false; + + if (host->version >= SDHCI_SPEC_300) { + if (host->preset_enabled) { + u16 pre_val; + + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + pre_val = sdhci_get_preset_value(host); + div = FIELD_GET(SDHCI_PRESET_SDCLK_FREQ_MASK, pre_val); + if (host->clk_mul && + (pre_val & SDHCI_PRESET_CLKGEN_SEL)) { + clk = SDHCI_PROG_CLOCK_MODE; + real_div = div + 1; + clk_mul = host->clk_mul; + } else { + real_div = max_t(int, 1, div << 1); + } + goto clock_set; + } + + /* + * Check if the Host Controller supports Programmable Clock + * Mode. + */ + if (host->clk_mul) { + for (div = 1; div <= 1024; div++) { + if ((host->max_clk * host->clk_mul / div) + <= clock) + break; + } + if ((host->max_clk * host->clk_mul / div) <= clock) { + /* + * Set Programmable Clock Mode in the Clock + * Control register. + */ + clk = SDHCI_PROG_CLOCK_MODE; + real_div = div; + clk_mul = host->clk_mul; + div--; + } else { + /* + * Divisor can be too small to reach clock + * speed requirement. Then use the base clock. + */ + switch_base_clk = true; + } + } + + if (!host->clk_mul || switch_base_clk) { + /* Version 3.00 divisors must be a multiple of 2. */ + if (host->max_clk <= clock) + div = 1; + else { + for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; + div += 2) { + if ((host->max_clk / div) <= clock) + break; + } + } + real_div = div; + div >>= 1; + if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN) + && !div && host->max_clk <= 25000000) + div = 1; + } + } else { + /* Version 2.00 divisors must be a power of 2. */ + for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) { + if ((host->max_clk / div) <= clock) + break; + } + real_div = div; + div >>= 1; + } + +clock_set: + if (real_div) + *actual_clock = (host->max_clk * clk_mul) / real_div; + clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT; + clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN) + << SDHCI_DIVIDER_HI_SHIFT; + + return clk; +} +EXPORT_SYMBOL_GPL(sdhci_calc_clk); + +void sdhci_enable_clk(struct sdhci_host *host, u16 clk) +{ + ktime_t timeout; + + clk |= SDHCI_CLOCK_INT_EN; + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); + + /* Wait max 150 ms */ + timeout = ktime_add_ms(ktime_get(), 150); + while (1) { + bool timedout = ktime_after(ktime_get(), timeout); + + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + if (clk & SDHCI_CLOCK_INT_STABLE) + break; + if (timedout) { + pr_err("%s: Internal clock never stabilised.\n", + mmc_hostname(host->mmc)); + sdhci_err_stats_inc(host, CTRL_TIMEOUT); + sdhci_dumpregs(host); + return; + } + udelay(10); + } + + if (host->version >= SDHCI_SPEC_410 && host->v4_mode) { + clk |= SDHCI_CLOCK_PLL_EN; + clk &= ~SDHCI_CLOCK_INT_STABLE; + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); + + /* Wait max 150 ms */ + timeout = ktime_add_ms(ktime_get(), 150); + while (1) { + bool timedout = ktime_after(ktime_get(), timeout); + + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + if (clk & SDHCI_CLOCK_INT_STABLE) + break; + if (timedout) { + pr_err("%s: PLL clock never stabilised.\n", + mmc_hostname(host->mmc)); + sdhci_err_stats_inc(host, CTRL_TIMEOUT); + sdhci_dumpregs(host); + return; + } + udelay(10); + } + } + + clk |= SDHCI_CLOCK_CARD_EN; + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); +} +EXPORT_SYMBOL_GPL(sdhci_enable_clk); + +void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) +{ + u16 clk; + + host->mmc->actual_clock = 0; + + sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL); + + if (clock == 0) + return; + + clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock); + sdhci_enable_clk(host, clk); +} +EXPORT_SYMBOL_GPL(sdhci_set_clock); + +static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode, + unsigned short vdd) +{ + struct mmc_host *mmc = host->mmc; + + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); + + if (mode != MMC_POWER_OFF) + sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL); + else + sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); +} + +void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode, + unsigned short vdd) +{ + u8 pwr = 0; + + if (mode != MMC_POWER_OFF) { + switch (1 << vdd) { + case MMC_VDD_165_195: + /* + * Without a regulator, SDHCI does not support 2.0v + * so we only get here if the driver deliberately + * added the 2.0v range to ocr_avail. Map it to 1.8v + * for the purpose of turning on the power. + */ + case MMC_VDD_20_21: + pwr = SDHCI_POWER_180; + break; + case MMC_VDD_29_30: + case MMC_VDD_30_31: + pwr = SDHCI_POWER_300; + break; + case MMC_VDD_32_33: + case MMC_VDD_33_34: + /* + * 3.4 ~ 3.6V are valid only for those platforms where it's + * known that the voltage range is supported by hardware. + */ + case MMC_VDD_34_35: + case MMC_VDD_35_36: + pwr = SDHCI_POWER_330; + break; + default: + WARN(1, "%s: Invalid vdd %#x\n", + mmc_hostname(host->mmc), vdd); + break; + } + } + + if (host->pwr == pwr) + return; + + host->pwr = pwr; + + if (pwr == 0) { + sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); + if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) + sdhci_runtime_pm_bus_off(host); + } else { + /* + * Spec says that we should clear the power reg before setting + * a new value. Some controllers don't seem to like this though. + */ + if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE)) + sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); + + /* + * At least the Marvell CaFe chip gets confused if we set the + * voltage and set turn on power at the same time, so set the + * voltage first. + */ + if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER) + sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL); + + pwr |= SDHCI_POWER_ON; + + sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL); + + if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON) + sdhci_runtime_pm_bus_on(host); + + /* + * Some controllers need an extra 10ms delay of 10ms before + * they can apply clock after applying power + */ + if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER) + mdelay(10); + } +} +EXPORT_SYMBOL_GPL(sdhci_set_power_noreg); + +void sdhci_set_power(struct sdhci_host *host, unsigned char mode, + unsigned short vdd) +{ + if (IS_ERR(host->mmc->supply.vmmc)) + sdhci_set_power_noreg(host, mode, vdd); + else + sdhci_set_power_reg(host, mode, vdd); +} +EXPORT_SYMBOL_GPL(sdhci_set_power); + +/* + * Some controllers need to configure a valid bus voltage on their power + * register regardless of whether an external regulator is taking care of power + * supply. This helper function takes care of it if set as the controller's + * sdhci_ops.set_power callback. + */ +void sdhci_set_power_and_bus_voltage(struct sdhci_host *host, + unsigned char mode, + unsigned short vdd) +{ + if (!IS_ERR(host->mmc->supply.vmmc)) { + struct mmc_host *mmc = host->mmc; + + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); + } + sdhci_set_power_noreg(host, mode, vdd); +} +EXPORT_SYMBOL_GPL(sdhci_set_power_and_bus_voltage); + +/*****************************************************************************\ + * * + * MMC callbacks * + * * +\*****************************************************************************/ + +void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct sdhci_host *host = mmc_priv(mmc); + struct mmc_command *cmd; + unsigned long flags; + bool present; + + /* Firstly check card presence */ + present = mmc->ops->get_cd(mmc); + + spin_lock_irqsave(&host->lock, flags); + + sdhci_led_activate(host); + + if (sdhci_present_error(host, mrq->cmd, present)) + goto out_finish; + + cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd; + + if (!sdhci_send_command_retry(host, cmd, flags)) + goto out_finish; + + spin_unlock_irqrestore(&host->lock, flags); + + return; + +out_finish: + sdhci_finish_mrq(host, mrq); + spin_unlock_irqrestore(&host->lock, flags); +} +EXPORT_SYMBOL_GPL(sdhci_request); + +int sdhci_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct sdhci_host *host = mmc_priv(mmc); + struct mmc_command *cmd; + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&host->lock, flags); + + if (sdhci_present_error(host, mrq->cmd, true)) { + sdhci_finish_mrq(host, mrq); + goto out_finish; + } + + cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd; + + /* + * The HSQ may send a command in interrupt context without polling + * the busy signaling, which means we should return BUSY if controller + * has not released inhibit bits to allow HSQ trying to send request + * again in non-atomic context. So we should not finish this request + * here. + */ + if (!sdhci_send_command(host, cmd)) + ret = -EBUSY; + else + sdhci_led_activate(host); + +out_finish: + spin_unlock_irqrestore(&host->lock, flags); + return ret; +} +EXPORT_SYMBOL_GPL(sdhci_request_atomic); + +void sdhci_set_bus_width(struct sdhci_host *host, int width) +{ + u8 ctrl; + + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + if (width == MMC_BUS_WIDTH_8) { + ctrl &= ~SDHCI_CTRL_4BITBUS; + ctrl |= SDHCI_CTRL_8BITBUS; + } else { + if (host->mmc->caps & MMC_CAP_8_BIT_DATA) + ctrl &= ~SDHCI_CTRL_8BITBUS; + if (width == MMC_BUS_WIDTH_4) + ctrl |= SDHCI_CTRL_4BITBUS; + else + ctrl &= ~SDHCI_CTRL_4BITBUS; + } + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); +} +EXPORT_SYMBOL_GPL(sdhci_set_bus_width); + +void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing) +{ + u16 ctrl_2; + + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + /* Select Bus Speed Mode for host */ + ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; + if ((timing == MMC_TIMING_MMC_HS200) || + (timing == MMC_TIMING_UHS_SDR104)) + ctrl_2 |= SDHCI_CTRL_UHS_SDR104; + else if (timing == MMC_TIMING_UHS_SDR12) + ctrl_2 |= SDHCI_CTRL_UHS_SDR12; + else if (timing == MMC_TIMING_UHS_SDR25) + ctrl_2 |= SDHCI_CTRL_UHS_SDR25; + else if (timing == MMC_TIMING_UHS_SDR50) + ctrl_2 |= SDHCI_CTRL_UHS_SDR50; + else if ((timing == MMC_TIMING_UHS_DDR50) || + (timing == MMC_TIMING_MMC_DDR52)) + ctrl_2 |= SDHCI_CTRL_UHS_DDR50; + else if (timing == MMC_TIMING_MMC_HS400) + ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */ + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); +} +EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling); + +static bool sdhci_timing_has_preset(unsigned char timing) +{ + switch (timing) { + case MMC_TIMING_UHS_SDR12: + case MMC_TIMING_UHS_SDR25: + case MMC_TIMING_UHS_SDR50: + case MMC_TIMING_UHS_SDR104: + case MMC_TIMING_UHS_DDR50: + case MMC_TIMING_MMC_DDR52: + return true; + }; + return false; +} + +static bool sdhci_preset_needed(struct sdhci_host *host, unsigned char timing) +{ + return !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) && + sdhci_timing_has_preset(timing); +} + +static bool sdhci_presetable_values_change(struct sdhci_host *host, struct mmc_ios *ios) +{ + /* + * Preset Values are: Driver Strength, Clock Generator and SDCLK/RCLK + * Frequency. Check if preset values need to be enabled, or the Driver + * Strength needs updating. Note, clock changes are handled separately. + */ + return !host->preset_enabled && + (sdhci_preset_needed(host, ios->timing) || host->drv_type != ios->drv_type); +} + +void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct sdhci_host *host = mmc_priv(mmc); + bool reinit_uhs = host->reinit_uhs; + bool turning_on_clk = false; + u8 ctrl; + + host->reinit_uhs = false; + + if (ios->power_mode == MMC_POWER_UNDEFINED) + return; + + if (host->flags & SDHCI_DEVICE_DEAD) { + if (!IS_ERR(mmc->supply.vmmc) && + ios->power_mode == MMC_POWER_OFF) + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); + return; + } + + /* + * Reset the chip on each power off. + * Should clear out any weird states. + */ + if (ios->power_mode == MMC_POWER_OFF) { + sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); + sdhci_reinit(host); + } + + if (host->version >= SDHCI_SPEC_300 && + (ios->power_mode == MMC_POWER_UP) && + !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) + sdhci_enable_preset_value(host, false); + + if (!ios->clock || ios->clock != host->clock) { + turning_on_clk = ios->clock && !host->clock; + + host->ops->set_clock(host, ios->clock); + host->clock = ios->clock; + + if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK && + host->clock) { + host->timeout_clk = mmc->actual_clock ? + mmc->actual_clock / 1000 : + host->clock / 1000; + mmc->max_busy_timeout = + host->ops->get_max_timeout_count ? + host->ops->get_max_timeout_count(host) : + 1 << 27; + mmc->max_busy_timeout /= host->timeout_clk; + } + } + + if (host->ops->set_power) + host->ops->set_power(host, ios->power_mode, ios->vdd); + else + sdhci_set_power(host, ios->power_mode, ios->vdd); + + if (host->ops->platform_send_init_74_clocks) + host->ops->platform_send_init_74_clocks(host, ios->power_mode); + + host->ops->set_bus_width(host, ios->bus_width); + + /* + * Special case to avoid multiple clock changes during voltage + * switching. + */ + if (!reinit_uhs && + turning_on_clk && + host->timing == ios->timing && + host->version >= SDHCI_SPEC_300 && + !sdhci_presetable_values_change(host, ios)) + return; + + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + + if (!(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) { + if (ios->timing == MMC_TIMING_SD_HS || + ios->timing == MMC_TIMING_MMC_HS || + ios->timing == MMC_TIMING_MMC_HS400 || + ios->timing == MMC_TIMING_MMC_HS200 || + ios->timing == MMC_TIMING_MMC_DDR52 || + ios->timing == MMC_TIMING_UHS_SDR50 || + ios->timing == MMC_TIMING_UHS_SDR104 || + ios->timing == MMC_TIMING_UHS_DDR50 || + ios->timing == MMC_TIMING_UHS_SDR25) + ctrl |= SDHCI_CTRL_HISPD; + else + ctrl &= ~SDHCI_CTRL_HISPD; + } + + if (host->version >= SDHCI_SPEC_300) { + u16 clk, ctrl_2; + + if (!host->preset_enabled) { + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + /* + * We only need to set Driver Strength if the + * preset value enable is not set. + */ + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK; + if (ios->drv_type == MMC_SET_DRIVER_TYPE_A) + ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A; + else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B) + ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B; + else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C) + ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C; + else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D) + ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D; + else { + pr_warn("%s: invalid driver type, default to driver type B\n", + mmc_hostname(mmc)); + ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B; + } + + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); + host->drv_type = ios->drv_type; + } else { + /* + * According to SDHC Spec v3.00, if the Preset Value + * Enable in the Host Control 2 register is set, we + * need to reset SD Clock Enable before changing High + * Speed Enable to avoid generating clock gliches. + */ + + /* Reset SD Clock Enable */ + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + clk &= ~SDHCI_CLOCK_CARD_EN; + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); + + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + + /* Re-enable SD Clock */ + host->ops->set_clock(host, host->clock); + } + + /* Reset SD Clock Enable */ + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + clk &= ~SDHCI_CLOCK_CARD_EN; + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); + + host->ops->set_uhs_signaling(host, ios->timing); + host->timing = ios->timing; + + if (sdhci_preset_needed(host, ios->timing)) { + u16 preset; + + sdhci_enable_preset_value(host, true); + preset = sdhci_get_preset_value(host); + ios->drv_type = FIELD_GET(SDHCI_PRESET_DRV_MASK, + preset); + host->drv_type = ios->drv_type; + } + + /* Re-enable SD Clock */ + host->ops->set_clock(host, host->clock); + } else + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); +} +EXPORT_SYMBOL_GPL(sdhci_set_ios); + +static int sdhci_get_cd(struct mmc_host *mmc) +{ + struct sdhci_host *host = mmc_priv(mmc); + int gpio_cd = mmc_gpio_get_cd(mmc); + + if (host->flags & SDHCI_DEVICE_DEAD) + return 0; + + /* If nonremovable, assume that the card is always present. */ + if (!mmc_card_is_removable(mmc)) + return 1; + + /* + * Try slot gpio detect, if defined it take precedence + * over build in controller functionality + */ + if (gpio_cd >= 0) + return !!gpio_cd; + + /* If polling, assume that the card is always present. */ + if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) + return 1; + + /* Host native card detect */ + return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT); +} + +int sdhci_get_cd_nogpio(struct mmc_host *mmc) +{ + struct sdhci_host *host = mmc_priv(mmc); + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&host->lock, flags); + + if (host->flags & SDHCI_DEVICE_DEAD) + goto out; + + ret = !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT); +out: + spin_unlock_irqrestore(&host->lock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(sdhci_get_cd_nogpio); + +static int sdhci_check_ro(struct sdhci_host *host) +{ + unsigned long flags; + int is_readonly; + + spin_lock_irqsave(&host->lock, flags); + + if (host->flags & SDHCI_DEVICE_DEAD) + is_readonly = 0; + else if (host->ops->get_ro) + is_readonly = host->ops->get_ro(host); + else if (mmc_can_gpio_ro(host->mmc)) + is_readonly = mmc_gpio_get_ro(host->mmc); + else + is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE) + & SDHCI_WRITE_PROTECT); + + spin_unlock_irqrestore(&host->lock, flags); + + /* This quirk needs to be replaced by a callback-function later */ + return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ? + !is_readonly : is_readonly; +} + +#define SAMPLE_COUNT 5 + +static int sdhci_get_ro(struct mmc_host *mmc) +{ + struct sdhci_host *host = mmc_priv(mmc); + int i, ro_count; + + if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT)) + return sdhci_check_ro(host); + + ro_count = 0; + for (i = 0; i < SAMPLE_COUNT; i++) { + if (sdhci_check_ro(host)) { + if (++ro_count > SAMPLE_COUNT / 2) + return 1; + } + msleep(30); + } + return 0; +} + +static void sdhci_hw_reset(struct mmc_host *mmc) +{ + struct sdhci_host *host = mmc_priv(mmc); + + if (host->ops && host->ops->hw_reset) + host->ops->hw_reset(host); +} + +static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable) +{ + if (!(host->flags & SDHCI_DEVICE_DEAD)) { + if (enable) + host->ier |= SDHCI_INT_CARD_INT; + else + host->ier &= ~SDHCI_INT_CARD_INT; + + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); + } +} + +void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable) +{ + struct sdhci_host *host = mmc_priv(mmc); + unsigned long flags; + + if (enable) + pm_runtime_get_noresume(mmc_dev(mmc)); + + spin_lock_irqsave(&host->lock, flags); + sdhci_enable_sdio_irq_nolock(host, enable); + spin_unlock_irqrestore(&host->lock, flags); + + if (!enable) + pm_runtime_put_noidle(mmc_dev(mmc)); +} +EXPORT_SYMBOL_GPL(sdhci_enable_sdio_irq); + +static void sdhci_ack_sdio_irq(struct mmc_host *mmc) +{ + struct sdhci_host *host = mmc_priv(mmc); + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + sdhci_enable_sdio_irq_nolock(host, true); + spin_unlock_irqrestore(&host->lock, flags); +} + +int sdhci_start_signal_voltage_switch(struct mmc_host *mmc, + struct mmc_ios *ios) +{ + struct sdhci_host *host = mmc_priv(mmc); + u16 ctrl; + int ret; + + /* + * Signal Voltage Switching is only applicable for Host Controllers + * v3.00 and above. + */ + if (host->version < SDHCI_SPEC_300) + return 0; + + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); + + switch (ios->signal_voltage) { + case MMC_SIGNAL_VOLTAGE_330: + if (!(host->flags & SDHCI_SIGNALING_330)) + return -EINVAL; + /* Set 1.8V Signal Enable in the Host Control2 register to 0 */ + ctrl &= ~SDHCI_CTRL_VDD_180; + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); + + if (!IS_ERR(mmc->supply.vqmmc)) { + ret = mmc_regulator_set_vqmmc(mmc, ios); + if (ret < 0) { + pr_warn("%s: Switching to 3.3V signalling voltage failed\n", + mmc_hostname(mmc)); + return -EIO; + } + } + /* Wait for 5ms */ + usleep_range(5000, 5500); + + /* 3.3V regulator output should be stable within 5 ms */ + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (!(ctrl & SDHCI_CTRL_VDD_180)) + return 0; + + pr_warn("%s: 3.3V regulator output did not become stable\n", + mmc_hostname(mmc)); + + return -EAGAIN; + case MMC_SIGNAL_VOLTAGE_180: + if (!(host->flags & SDHCI_SIGNALING_180)) + return -EINVAL; + if (!IS_ERR(mmc->supply.vqmmc)) { + ret = mmc_regulator_set_vqmmc(mmc, ios); + if (ret < 0) { + pr_warn("%s: Switching to 1.8V signalling voltage failed\n", + mmc_hostname(mmc)); + return -EIO; + } + } + + /* + * Enable 1.8V Signal Enable in the Host Control2 + * register + */ + ctrl |= SDHCI_CTRL_VDD_180; + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); + + /* Some controller need to do more when switching */ + if (host->ops->voltage_switch) + host->ops->voltage_switch(host); + + /* 1.8V regulator output should be stable within 5 ms */ + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (ctrl & SDHCI_CTRL_VDD_180) + return 0; + + pr_warn("%s: 1.8V regulator output did not become stable\n", + mmc_hostname(mmc)); + + return -EAGAIN; + case MMC_SIGNAL_VOLTAGE_120: + if (!(host->flags & SDHCI_SIGNALING_120)) + return -EINVAL; + if (!IS_ERR(mmc->supply.vqmmc)) { + ret = mmc_regulator_set_vqmmc(mmc, ios); + if (ret < 0) { + pr_warn("%s: Switching to 1.2V signalling voltage failed\n", + mmc_hostname(mmc)); + return -EIO; + } + } + return 0; + default: + /* No signal voltage switch required */ + return 0; + } +} +EXPORT_SYMBOL_GPL(sdhci_start_signal_voltage_switch); + +static int sdhci_card_busy(struct mmc_host *mmc) +{ + struct sdhci_host *host = mmc_priv(mmc); + u32 present_state; + + /* Check whether DAT[0] is 0 */ + present_state = sdhci_readl(host, SDHCI_PRESENT_STATE); + + return !(present_state & SDHCI_DATA_0_LVL_MASK); +} + +static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct sdhci_host *host = mmc_priv(mmc); + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + host->flags |= SDHCI_HS400_TUNING; + spin_unlock_irqrestore(&host->lock, flags); + + return 0; +} + +void sdhci_start_tuning(struct sdhci_host *host) +{ + u16 ctrl; + + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); + ctrl |= SDHCI_CTRL_EXEC_TUNING; + if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND) + ctrl |= SDHCI_CTRL_TUNED_CLK; + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); + + /* + * As per the Host Controller spec v3.00, tuning command + * generates Buffer Read Ready interrupt, so enable that. + * + * Note: The spec clearly says that when tuning sequence + * is being performed, the controller does not generate + * interrupts other than Buffer Read Ready interrupt. But + * to make sure we don't hit a controller bug, we _only_ + * enable Buffer Read Ready interrupt here. + */ + sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE); + sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE); +} +EXPORT_SYMBOL_GPL(sdhci_start_tuning); + +void sdhci_end_tuning(struct sdhci_host *host) +{ + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); +} +EXPORT_SYMBOL_GPL(sdhci_end_tuning); + +void sdhci_reset_tuning(struct sdhci_host *host) +{ + u16 ctrl; + + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); + ctrl &= ~SDHCI_CTRL_TUNED_CLK; + ctrl &= ~SDHCI_CTRL_EXEC_TUNING; + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); +} +EXPORT_SYMBOL_GPL(sdhci_reset_tuning); + +void sdhci_abort_tuning(struct sdhci_host *host, u32 opcode) +{ + sdhci_reset_tuning(host); + + sdhci_reset_for(host, TUNING_ABORT); + + sdhci_end_tuning(host); + + mmc_send_abort_tuning(host->mmc, opcode); +} +EXPORT_SYMBOL_GPL(sdhci_abort_tuning); + +/* + * We use sdhci_send_tuning() because mmc_send_tuning() is not a good fit. SDHCI + * tuning command does not have a data payload (or rather the hardware does it + * automatically) so mmc_send_tuning() will return -EIO. Also the tuning command + * interrupt setup is different to other commands and there is no timeout + * interrupt so special handling is needed. + */ +void sdhci_send_tuning(struct sdhci_host *host, u32 opcode) +{ + struct mmc_host *mmc = host->mmc; + struct mmc_command cmd = {}; + struct mmc_request mrq = {}; + unsigned long flags; + u32 b = host->sdma_boundary; + + spin_lock_irqsave(&host->lock, flags); + + cmd.opcode = opcode; + cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; + cmd.mrq = &mrq; + + mrq.cmd = &cmd; + /* + * In response to CMD19, the card sends 64 bytes of tuning + * block to the Host Controller. So we set the block size + * to 64 here. + */ + if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 && + mmc->ios.bus_width == MMC_BUS_WIDTH_8) + sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 128), SDHCI_BLOCK_SIZE); + else + sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 64), SDHCI_BLOCK_SIZE); + + /* + * The tuning block is sent by the card to the host controller. + * So we set the TRNS_READ bit in the Transfer Mode register. + * This also takes care of setting DMA Enable and Multi Block + * Select in the same register to 0. + */ + sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE); + + if (!sdhci_send_command_retry(host, &cmd, flags)) { + spin_unlock_irqrestore(&host->lock, flags); + host->tuning_done = 0; + return; + } + + host->cmd = NULL; + + sdhci_del_timer(host, &mrq); + + host->tuning_done = 0; + + spin_unlock_irqrestore(&host->lock, flags); + + /* Wait for Buffer Read Ready interrupt */ + wait_event_timeout(host->buf_ready_int, (host->tuning_done == 1), + msecs_to_jiffies(50)); + +} +EXPORT_SYMBOL_GPL(sdhci_send_tuning); + +static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode) +{ + int i; + + /* + * Issue opcode repeatedly till Execute Tuning is set to 0 or the number + * of loops reaches tuning loop count. + */ + for (i = 0; i < host->tuning_loop_count; i++) { + u16 ctrl; + + sdhci_send_tuning(host, opcode); + + if (!host->tuning_done) { + pr_debug("%s: Tuning timeout, falling back to fixed sampling clock\n", + mmc_hostname(host->mmc)); + sdhci_abort_tuning(host, opcode); + return -ETIMEDOUT; + } + + /* Spec does not require a delay between tuning cycles */ + if (host->tuning_delay > 0) + mdelay(host->tuning_delay); + + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) { + if (ctrl & SDHCI_CTRL_TUNED_CLK) + return 0; /* Success! */ + break; + } + + } + + pr_info("%s: Tuning failed, falling back to fixed sampling clock\n", + mmc_hostname(host->mmc)); + sdhci_reset_tuning(host); + return -EAGAIN; +} + +int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) +{ + struct sdhci_host *host = mmc_priv(mmc); + int err = 0; + unsigned int tuning_count = 0; + bool hs400_tuning; + + hs400_tuning = host->flags & SDHCI_HS400_TUNING; + + if (host->tuning_mode == SDHCI_TUNING_MODE_1) + tuning_count = host->tuning_count; + + /* + * The Host Controller needs tuning in case of SDR104 and DDR50 + * mode, and for SDR50 mode when Use Tuning for SDR50 is set in + * the Capabilities register. + * If the Host Controller supports the HS200 mode then the + * tuning function has to be executed. + */ + switch (host->timing) { + /* HS400 tuning is done in HS200 mode */ + case MMC_TIMING_MMC_HS400: + err = -EINVAL; + goto out; + + case MMC_TIMING_MMC_HS200: + /* + * Periodic re-tuning for HS400 is not expected to be needed, so + * disable it here. + */ + if (hs400_tuning) + tuning_count = 0; + break; + + case MMC_TIMING_UHS_SDR104: + case MMC_TIMING_UHS_DDR50: + break; + + case MMC_TIMING_UHS_SDR50: + if (host->flags & SDHCI_SDR50_NEEDS_TUNING) + break; + fallthrough; + + default: + goto out; + } + + if (host->ops->platform_execute_tuning) { + err = host->ops->platform_execute_tuning(host, opcode); + goto out; + } + + mmc->retune_period = tuning_count; + + if (host->tuning_delay < 0) + host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK; + + sdhci_start_tuning(host); + + host->tuning_err = __sdhci_execute_tuning(host, opcode); + + sdhci_end_tuning(host); +out: + host->flags &= ~SDHCI_HS400_TUNING; + + return err; +} +EXPORT_SYMBOL_GPL(sdhci_execute_tuning); + +static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable) +{ + /* Host Controller v3.00 defines preset value registers */ + if (host->version < SDHCI_SPEC_300) + return; + + /* + * We only enable or disable Preset Value if they are not already + * enabled or disabled respectively. Otherwise, we bail out. + */ + if (host->preset_enabled != enable) { + u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); + + if (enable) + ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE; + else + ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE; + + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); + + if (enable) + host->flags |= SDHCI_PV_ENABLED; + else + host->flags &= ~SDHCI_PV_ENABLED; + + host->preset_enabled = enable; + } +} + +static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq, + int err) +{ + struct mmc_data *data = mrq->data; + + if (data->host_cookie != COOKIE_UNMAPPED) + dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len, + mmc_get_dma_dir(data)); + + data->host_cookie = COOKIE_UNMAPPED; +} + +static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct sdhci_host *host = mmc_priv(mmc); + + mrq->data->host_cookie = COOKIE_UNMAPPED; + + /* + * No pre-mapping in the pre hook if we're using the bounce buffer, + * for that we would need two bounce buffers since one buffer is + * in flight when this is getting called. + */ + if (host->flags & SDHCI_REQ_USE_DMA && !host->bounce_buffer) + sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED); +} + +static void sdhci_error_out_mrqs(struct sdhci_host *host, int err) +{ + if (host->data_cmd) { + host->data_cmd->error = err; + sdhci_finish_mrq(host, host->data_cmd->mrq); + } + + if (host->cmd) { + host->cmd->error = err; + sdhci_finish_mrq(host, host->cmd->mrq); + } +} + +static void sdhci_card_event(struct mmc_host *mmc) +{ + struct sdhci_host *host = mmc_priv(mmc); + unsigned long flags; + int present; + + /* First check if client has provided their own card event */ + if (host->ops->card_event) + host->ops->card_event(host); + + present = mmc->ops->get_cd(mmc); + + spin_lock_irqsave(&host->lock, flags); + + /* Check sdhci_has_requests() first in case we are runtime suspended */ + if (sdhci_has_requests(host) && !present) { + pr_err("%s: Card removed during transfer!\n", + mmc_hostname(mmc)); + pr_err("%s: Resetting controller.\n", + mmc_hostname(mmc)); + + sdhci_reset_for(host, CARD_REMOVED); + + sdhci_error_out_mrqs(host, -ENOMEDIUM); + } + + spin_unlock_irqrestore(&host->lock, flags); +} + +static const struct mmc_host_ops sdhci_ops = { + .request = sdhci_request, + .post_req = sdhci_post_req, + .pre_req = sdhci_pre_req, + .set_ios = sdhci_set_ios, + .get_cd = sdhci_get_cd, + .get_ro = sdhci_get_ro, + .card_hw_reset = sdhci_hw_reset, + .enable_sdio_irq = sdhci_enable_sdio_irq, + .ack_sdio_irq = sdhci_ack_sdio_irq, + .start_signal_voltage_switch = sdhci_start_signal_voltage_switch, + .prepare_hs400_tuning = sdhci_prepare_hs400_tuning, + .execute_tuning = sdhci_execute_tuning, + .card_event = sdhci_card_event, + .card_busy = sdhci_card_busy, +}; + +/*****************************************************************************\ + * * + * Request done * + * * +\*****************************************************************************/ + +static bool sdhci_request_done(struct sdhci_host *host) +{ + unsigned long flags; + struct mmc_request *mrq; + int i; + + spin_lock_irqsave(&host->lock, flags); + + for (i = 0; i < SDHCI_MAX_MRQS; i++) { + mrq = host->mrqs_done[i]; + if (mrq) + break; + } + + if (!mrq) { + spin_unlock_irqrestore(&host->lock, flags); + return true; + } + + /* + * The controller needs a reset of internal state machines + * upon error conditions. + */ + if (sdhci_needs_reset(host, mrq)) { + /* + * Do not finish until command and data lines are available for + * reset. Note there can only be one other mrq, so it cannot + * also be in mrqs_done, otherwise host->cmd and host->data_cmd + * would both be null. + */ + if (host->cmd || host->data_cmd) { + spin_unlock_irqrestore(&host->lock, flags); + return true; + } + + /* Some controllers need this kick or reset won't work here */ + if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) + /* This is to force an update */ + host->ops->set_clock(host, host->clock); + + sdhci_reset_for(host, REQUEST_ERROR); + + host->pending_reset = false; + } + + /* + * Always unmap the data buffers if they were mapped by + * sdhci_prepare_data() whenever we finish with a request. + * This avoids leaking DMA mappings on error. + */ + if (host->flags & SDHCI_REQ_USE_DMA) { + struct mmc_data *data = mrq->data; + + if (host->use_external_dma && data && + (mrq->cmd->error || data->error)) { + struct dma_chan *chan = sdhci_external_dma_channel(host, data); + + host->mrqs_done[i] = NULL; + spin_unlock_irqrestore(&host->lock, flags); + dmaengine_terminate_sync(chan); + spin_lock_irqsave(&host->lock, flags); + sdhci_set_mrq_done(host, mrq); + } + + if (data && data->host_cookie == COOKIE_MAPPED) { + if (host->bounce_buffer) { + /* + * On reads, copy the bounced data into the + * sglist + */ + if (mmc_get_dma_dir(data) == DMA_FROM_DEVICE) { + unsigned int length = data->bytes_xfered; + + if (length > host->bounce_buffer_size) { + pr_err("%s: bounce buffer is %u bytes but DMA claims to have transferred %u bytes\n", + mmc_hostname(host->mmc), + host->bounce_buffer_size, + data->bytes_xfered); + /* Cap it down and continue */ + length = host->bounce_buffer_size; + } + dma_sync_single_for_cpu( + mmc_dev(host->mmc), + host->bounce_addr, + host->bounce_buffer_size, + DMA_FROM_DEVICE); + sg_copy_from_buffer(data->sg, + data->sg_len, + host->bounce_buffer, + length); + } else { + /* No copying, just switch ownership */ + dma_sync_single_for_cpu( + mmc_dev(host->mmc), + host->bounce_addr, + host->bounce_buffer_size, + mmc_get_dma_dir(data)); + } + } else { + /* Unmap the raw data */ + dma_unmap_sg(mmc_dev(host->mmc), data->sg, + data->sg_len, + mmc_get_dma_dir(data)); + } + data->host_cookie = COOKIE_UNMAPPED; + } + } + + host->mrqs_done[i] = NULL; + + spin_unlock_irqrestore(&host->lock, flags); + + if (host->ops->request_done) + host->ops->request_done(host, mrq); + else + mmc_request_done(host->mmc, mrq); + + return false; +} + +static void sdhci_complete_work(struct work_struct *work) +{ + struct sdhci_host *host = container_of(work, struct sdhci_host, + complete_work); + + while (!sdhci_request_done(host)) + ; +} + +static void sdhci_timeout_timer(struct timer_list *t) +{ + struct sdhci_host *host; + unsigned long flags; + + host = from_timer(host, t, timer); + + spin_lock_irqsave(&host->lock, flags); + + if (host->cmd && !sdhci_data_line_cmd(host->cmd)) { + pr_err("%s: Timeout waiting for hardware cmd interrupt.\n", + mmc_hostname(host->mmc)); + sdhci_err_stats_inc(host, REQ_TIMEOUT); + sdhci_dumpregs(host); + + host->cmd->error = -ETIMEDOUT; + sdhci_finish_mrq(host, host->cmd->mrq); + } + + spin_unlock_irqrestore(&host->lock, flags); +} + +static void sdhci_timeout_data_timer(struct timer_list *t) +{ + struct sdhci_host *host; + unsigned long flags; + + host = from_timer(host, t, data_timer); + + spin_lock_irqsave(&host->lock, flags); + + if (host->data || host->data_cmd || + (host->cmd && sdhci_data_line_cmd(host->cmd))) { + pr_err("%s: Timeout waiting for hardware interrupt.\n", + mmc_hostname(host->mmc)); + sdhci_err_stats_inc(host, REQ_TIMEOUT); + sdhci_dumpregs(host); + + if (host->data) { + host->data->error = -ETIMEDOUT; + __sdhci_finish_data(host, true); + queue_work(host->complete_wq, &host->complete_work); + } else if (host->data_cmd) { + host->data_cmd->error = -ETIMEDOUT; + sdhci_finish_mrq(host, host->data_cmd->mrq); + } else { + host->cmd->error = -ETIMEDOUT; + sdhci_finish_mrq(host, host->cmd->mrq); + } + } + + spin_unlock_irqrestore(&host->lock, flags); +} + +/*****************************************************************************\ + * * + * Interrupt handling * + * * +\*****************************************************************************/ + +static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p) +{ + /* Handle auto-CMD12 error */ + if (intmask & SDHCI_INT_AUTO_CMD_ERR && host->data_cmd) { + struct mmc_request *mrq = host->data_cmd->mrq; + u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS); + int data_err_bit = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ? + SDHCI_INT_DATA_TIMEOUT : + SDHCI_INT_DATA_CRC; + + /* Treat auto-CMD12 error the same as data error */ + if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) { + *intmask_p |= data_err_bit; + return; + } + } + + if (!host->cmd) { + /* + * SDHCI recovers from errors by resetting the cmd and data + * circuits. Until that is done, there very well might be more + * interrupts, so ignore them in that case. + */ + if (host->pending_reset) + return; + pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n", + mmc_hostname(host->mmc), (unsigned)intmask); + sdhci_err_stats_inc(host, UNEXPECTED_IRQ); + sdhci_dumpregs(host); + return; + } + + if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC | + SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) { + if (intmask & SDHCI_INT_TIMEOUT) { + host->cmd->error = -ETIMEDOUT; + sdhci_err_stats_inc(host, CMD_TIMEOUT); + } else { + host->cmd->error = -EILSEQ; + if (!mmc_op_tuning(host->cmd->opcode)) + sdhci_err_stats_inc(host, CMD_CRC); + } + /* Treat data command CRC error the same as data CRC error */ + if (host->cmd->data && + (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) == + SDHCI_INT_CRC) { + host->cmd = NULL; + *intmask_p |= SDHCI_INT_DATA_CRC; + return; + } + + __sdhci_finish_mrq(host, host->cmd->mrq); + return; + } + + /* Handle auto-CMD23 error */ + if (intmask & SDHCI_INT_AUTO_CMD_ERR) { + struct mmc_request *mrq = host->cmd->mrq; + u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS); + int err = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ? + -ETIMEDOUT : + -EILSEQ; + + sdhci_err_stats_inc(host, AUTO_CMD); + + if (sdhci_auto_cmd23(host, mrq)) { + mrq->sbc->error = err; + __sdhci_finish_mrq(host, mrq); + return; + } + } + + if (intmask & SDHCI_INT_RESPONSE) + sdhci_finish_command(host); +} + +static void sdhci_adma_show_error(struct sdhci_host *host) +{ + void *desc = host->adma_table; + dma_addr_t dma = host->adma_addr; + + sdhci_dumpregs(host); + + while (true) { + struct sdhci_adma2_64_desc *dma_desc = desc; + + if (host->flags & SDHCI_USE_64_BIT_DMA) + SDHCI_DUMP("%08llx: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n", + (unsigned long long)dma, + le32_to_cpu(dma_desc->addr_hi), + le32_to_cpu(dma_desc->addr_lo), + le16_to_cpu(dma_desc->len), + le16_to_cpu(dma_desc->cmd)); + else + SDHCI_DUMP("%08llx: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n", + (unsigned long long)dma, + le32_to_cpu(dma_desc->addr_lo), + le16_to_cpu(dma_desc->len), + le16_to_cpu(dma_desc->cmd)); + + desc += host->desc_sz; + dma += host->desc_sz; + + if (dma_desc->cmd & cpu_to_le16(ADMA2_END)) + break; + } +} + +static void sdhci_data_irq(struct sdhci_host *host, u32 intmask) +{ + u32 command; + + /* + * CMD19 generates _only_ Buffer Read Ready interrupt if + * use sdhci_send_tuning. + * Need to exclude this case: PIO mode and use mmc_send_tuning, + * If not, sdhci_transfer_pio will never be called, make the + * SDHCI_INT_DATA_AVAIL always there, stuck in irq storm. + */ + if (intmask & SDHCI_INT_DATA_AVAIL && !host->data) { + command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)); + if (command == MMC_SEND_TUNING_BLOCK || + command == MMC_SEND_TUNING_BLOCK_HS200) { + host->tuning_done = 1; + wake_up(&host->buf_ready_int); + return; + } + } + + if (!host->data) { + struct mmc_command *data_cmd = host->data_cmd; + + /* + * The "data complete" interrupt is also used to + * indicate that a busy state has ended. See comment + * above in sdhci_cmd_irq(). + */ + if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) { + if (intmask & SDHCI_INT_DATA_TIMEOUT) { + host->data_cmd = NULL; + data_cmd->error = -ETIMEDOUT; + sdhci_err_stats_inc(host, CMD_TIMEOUT); + __sdhci_finish_mrq(host, data_cmd->mrq); + return; + } + if (intmask & SDHCI_INT_DATA_END) { + host->data_cmd = NULL; + /* + * Some cards handle busy-end interrupt + * before the command completed, so make + * sure we do things in the proper order. + */ + if (host->cmd == data_cmd) + return; + + __sdhci_finish_mrq(host, data_cmd->mrq); + return; + } + } + + /* + * SDHCI recovers from errors by resetting the cmd and data + * circuits. Until that is done, there very well might be more + * interrupts, so ignore them in that case. + */ + if (host->pending_reset) + return; + + pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n", + mmc_hostname(host->mmc), (unsigned)intmask); + sdhci_err_stats_inc(host, UNEXPECTED_IRQ); + sdhci_dumpregs(host); + + return; + } + + if (intmask & SDHCI_INT_DATA_TIMEOUT) { + host->data->error = -ETIMEDOUT; + sdhci_err_stats_inc(host, DAT_TIMEOUT); + } else if (intmask & SDHCI_INT_DATA_END_BIT) { + host->data->error = -EILSEQ; + if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)))) + sdhci_err_stats_inc(host, DAT_CRC); + } else if ((intmask & SDHCI_INT_DATA_CRC) && + SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)) + != MMC_BUS_TEST_R) { + host->data->error = -EILSEQ; + if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)))) + sdhci_err_stats_inc(host, DAT_CRC); + } else if (intmask & SDHCI_INT_ADMA_ERROR) { + pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc), + intmask); + sdhci_adma_show_error(host); + sdhci_err_stats_inc(host, ADMA); + host->data->error = -EIO; + if (host->ops->adma_workaround) + host->ops->adma_workaround(host, intmask); + } + + if (host->data->error) + sdhci_finish_data(host); + else { + if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL)) + sdhci_transfer_pio(host); + + /* + * We currently don't do anything fancy with DMA + * boundaries, but as we can't disable the feature + * we need to at least restart the transfer. + * + * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS) + * should return a valid address to continue from, but as + * some controllers are faulty, don't trust them. + */ + if (intmask & SDHCI_INT_DMA_END) { + dma_addr_t dmastart, dmanow; + + dmastart = sdhci_sdma_address(host); + dmanow = dmastart + host->data->bytes_xfered; + /* + * Force update to the next DMA block boundary. + */ + dmanow = (dmanow & + ~((dma_addr_t)SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) + + SDHCI_DEFAULT_BOUNDARY_SIZE; + host->data->bytes_xfered = dmanow - dmastart; + DBG("DMA base %pad, transferred 0x%06x bytes, next %pad\n", + &dmastart, host->data->bytes_xfered, &dmanow); + sdhci_set_sdma_addr(host, dmanow); + } + + if (intmask & SDHCI_INT_DATA_END) { + if (host->cmd == host->data_cmd) { + /* + * Data managed to finish before the + * command completed. Make sure we do + * things in the proper order. + */ + host->data_early = 1; + } else { + sdhci_finish_data(host); + } + } + } +} + +static inline bool sdhci_defer_done(struct sdhci_host *host, + struct mmc_request *mrq) +{ + struct mmc_data *data = mrq->data; + + return host->pending_reset || host->always_defer_done || + ((host->flags & SDHCI_REQ_USE_DMA) && data && + data->host_cookie == COOKIE_MAPPED); +} + +static irqreturn_t sdhci_irq(int irq, void *dev_id) +{ + struct mmc_request *mrqs_done[SDHCI_MAX_MRQS] = {0}; + irqreturn_t result = IRQ_NONE; + struct sdhci_host *host = dev_id; + u32 intmask, mask, unexpected = 0; + int max_loops = 16; + int i; + + spin_lock(&host->lock); + + if (host->runtime_suspended) { + spin_unlock(&host->lock); + return IRQ_NONE; + } + + intmask = sdhci_readl(host, SDHCI_INT_STATUS); + if (!intmask || intmask == 0xffffffff) { + result = IRQ_NONE; + goto out; + } + + do { + DBG("IRQ status 0x%08x\n", intmask); + + if (host->ops->irq) { + intmask = host->ops->irq(host, intmask); + if (!intmask) + goto cont; + } + + /* Clear selected interrupts. */ + mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK | + SDHCI_INT_BUS_POWER); + sdhci_writel(host, mask, SDHCI_INT_STATUS); + + if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) { + u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) & + SDHCI_CARD_PRESENT; + + /* + * There is a observation on i.mx esdhc. INSERT + * bit will be immediately set again when it gets + * cleared, if a card is inserted. We have to mask + * the irq to prevent interrupt storm which will + * freeze the system. And the REMOVE gets the + * same situation. + * + * More testing are needed here to ensure it works + * for other platforms though. + */ + host->ier &= ~(SDHCI_INT_CARD_INSERT | + SDHCI_INT_CARD_REMOVE); + host->ier |= present ? SDHCI_INT_CARD_REMOVE : + SDHCI_INT_CARD_INSERT; + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); + + sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT | + SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS); + + host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT | + SDHCI_INT_CARD_REMOVE); + result = IRQ_WAKE_THREAD; + } + + if (intmask & SDHCI_INT_CMD_MASK) + sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK, &intmask); + + if (intmask & SDHCI_INT_DATA_MASK) + sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK); + + if (intmask & SDHCI_INT_BUS_POWER) + pr_err("%s: Card is consuming too much power!\n", + mmc_hostname(host->mmc)); + + if (intmask & SDHCI_INT_RETUNE) + mmc_retune_needed(host->mmc); + + if ((intmask & SDHCI_INT_CARD_INT) && + (host->ier & SDHCI_INT_CARD_INT)) { + sdhci_enable_sdio_irq_nolock(host, false); + sdio_signal_irq(host->mmc); + } + + intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE | + SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK | + SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER | + SDHCI_INT_RETUNE | SDHCI_INT_CARD_INT); + + if (intmask) { + unexpected |= intmask; + sdhci_writel(host, intmask, SDHCI_INT_STATUS); + } +cont: + if (result == IRQ_NONE) + result = IRQ_HANDLED; + + intmask = sdhci_readl(host, SDHCI_INT_STATUS); + } while (intmask && --max_loops); + + /* Determine if mrqs can be completed immediately */ + for (i = 0; i < SDHCI_MAX_MRQS; i++) { + struct mmc_request *mrq = host->mrqs_done[i]; + + if (!mrq) + continue; + + if (sdhci_defer_done(host, mrq)) { + result = IRQ_WAKE_THREAD; + } else { + mrqs_done[i] = mrq; + host->mrqs_done[i] = NULL; + } + } +out: + if (host->deferred_cmd) + result = IRQ_WAKE_THREAD; + + spin_unlock(&host->lock); + + /* Process mrqs ready for immediate completion */ + for (i = 0; i < SDHCI_MAX_MRQS; i++) { + if (!mrqs_done[i]) + continue; + + if (host->ops->request_done) + host->ops->request_done(host, mrqs_done[i]); + else + mmc_request_done(host->mmc, mrqs_done[i]); + } + + if (unexpected) { + pr_err("%s: Unexpected interrupt 0x%08x.\n", + mmc_hostname(host->mmc), unexpected); + sdhci_err_stats_inc(host, UNEXPECTED_IRQ); + sdhci_dumpregs(host); + } + + return result; +} + +static irqreturn_t sdhci_thread_irq(int irq, void *dev_id) +{ + struct sdhci_host *host = dev_id; + struct mmc_command *cmd; + unsigned long flags; + u32 isr; + + while (!sdhci_request_done(host)) + ; + + spin_lock_irqsave(&host->lock, flags); + + isr = host->thread_isr; + host->thread_isr = 0; + + cmd = host->deferred_cmd; + if (cmd && !sdhci_send_command_retry(host, cmd, flags)) + sdhci_finish_mrq(host, cmd->mrq); + + spin_unlock_irqrestore(&host->lock, flags); + + if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) { + struct mmc_host *mmc = host->mmc; + + mmc->ops->card_event(mmc); + mmc_detect_change(mmc, msecs_to_jiffies(200)); + } + + return IRQ_HANDLED; +} + +/*****************************************************************************\ + * * + * Suspend/resume * + * * +\*****************************************************************************/ + +#ifdef CONFIG_PM + +static bool sdhci_cd_irq_can_wakeup(struct sdhci_host *host) +{ + return mmc_card_is_removable(host->mmc) && + !(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) && + !mmc_can_gpio_cd(host->mmc); +} + +/* + * To enable wakeup events, the corresponding events have to be enabled in + * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal + * Table' in the SD Host Controller Standard Specification. + * It is useless to restore SDHCI_INT_ENABLE state in + * sdhci_disable_irq_wakeups() since it will be set by + * sdhci_enable_card_detection() or sdhci_init(). + */ +static bool sdhci_enable_irq_wakeups(struct sdhci_host *host) +{ + u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE | + SDHCI_WAKE_ON_INT; + u32 irq_val = 0; + u8 wake_val = 0; + u8 val; + + if (sdhci_cd_irq_can_wakeup(host)) { + wake_val |= SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE; + irq_val |= SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE; + } + + if (mmc_card_wake_sdio_irq(host->mmc)) { + wake_val |= SDHCI_WAKE_ON_INT; + irq_val |= SDHCI_INT_CARD_INT; + } + + if (!irq_val) + return false; + + val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL); + val &= ~mask; + val |= wake_val; + sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL); + + sdhci_writel(host, irq_val, SDHCI_INT_ENABLE); + + host->irq_wake_enabled = !enable_irq_wake(host->irq); + + return host->irq_wake_enabled; +} + +static void sdhci_disable_irq_wakeups(struct sdhci_host *host) +{ + u8 val; + u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE + | SDHCI_WAKE_ON_INT; + + val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL); + val &= ~mask; + sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL); + + disable_irq_wake(host->irq); + + host->irq_wake_enabled = false; +} + +int sdhci_suspend_host(struct sdhci_host *host) +{ + sdhci_disable_card_detection(host); + + mmc_retune_timer_stop(host->mmc); + + if (!device_may_wakeup(mmc_dev(host->mmc)) || + !sdhci_enable_irq_wakeups(host)) { + host->ier = 0; + sdhci_writel(host, 0, SDHCI_INT_ENABLE); + sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); + free_irq(host->irq, host); + } + + return 0; +} + +EXPORT_SYMBOL_GPL(sdhci_suspend_host); + +int sdhci_resume_host(struct sdhci_host *host) +{ + struct mmc_host *mmc = host->mmc; + int ret = 0; + + if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { + if (host->ops->enable_dma) + host->ops->enable_dma(host); + } + + if ((mmc->pm_flags & MMC_PM_KEEP_POWER) && + (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) { + /* Card keeps power but host controller does not */ + sdhci_init(host, 0); + host->pwr = 0; + host->clock = 0; + host->reinit_uhs = true; + mmc->ops->set_ios(mmc, &mmc->ios); + } else { + sdhci_init(host, (mmc->pm_flags & MMC_PM_KEEP_POWER)); + } + + if (host->irq_wake_enabled) { + sdhci_disable_irq_wakeups(host); + } else { + ret = request_threaded_irq(host->irq, sdhci_irq, + sdhci_thread_irq, IRQF_SHARED, + mmc_hostname(mmc), host); + if (ret) + return ret; + } + + sdhci_enable_card_detection(host); + + return ret; +} + +EXPORT_SYMBOL_GPL(sdhci_resume_host); + +int sdhci_runtime_suspend_host(struct sdhci_host *host) +{ + unsigned long flags; + + mmc_retune_timer_stop(host->mmc); + + spin_lock_irqsave(&host->lock, flags); + host->ier &= SDHCI_INT_CARD_INT; + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); + spin_unlock_irqrestore(&host->lock, flags); + + synchronize_hardirq(host->irq); + + spin_lock_irqsave(&host->lock, flags); + host->runtime_suspended = true; + spin_unlock_irqrestore(&host->lock, flags); + + return 0; +} +EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host); + +int sdhci_runtime_resume_host(struct sdhci_host *host, int soft_reset) +{ + struct mmc_host *mmc = host->mmc; + unsigned long flags; + int host_flags = host->flags; + + if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { + if (host->ops->enable_dma) + host->ops->enable_dma(host); + } + + sdhci_init(host, soft_reset); + + if (mmc->ios.power_mode != MMC_POWER_UNDEFINED && + mmc->ios.power_mode != MMC_POWER_OFF) { + /* Force clock and power re-program */ + host->pwr = 0; + host->clock = 0; + host->reinit_uhs = true; + mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios); + mmc->ops->set_ios(mmc, &mmc->ios); + + if ((host_flags & SDHCI_PV_ENABLED) && + !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) { + spin_lock_irqsave(&host->lock, flags); + sdhci_enable_preset_value(host, true); + spin_unlock_irqrestore(&host->lock, flags); + } + + if ((mmc->caps2 & MMC_CAP2_HS400_ES) && + mmc->ops->hs400_enhanced_strobe) + mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios); + } + + spin_lock_irqsave(&host->lock, flags); + + host->runtime_suspended = false; + + /* Enable SDIO IRQ */ + if (sdio_irq_claimed(mmc)) + sdhci_enable_sdio_irq_nolock(host, true); + + /* Enable Card Detection */ + sdhci_enable_card_detection(host); + + spin_unlock_irqrestore(&host->lock, flags); + + return 0; +} +EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host); + +#endif /* CONFIG_PM */ + +/*****************************************************************************\ + * * + * Command Queue Engine (CQE) helpers * + * * +\*****************************************************************************/ + +void sdhci_cqe_enable(struct mmc_host *mmc) +{ + struct sdhci_host *host = mmc_priv(mmc); + unsigned long flags; + u8 ctrl; + + spin_lock_irqsave(&host->lock, flags); + + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + ctrl &= ~SDHCI_CTRL_DMA_MASK; + /* + * Host from V4.10 supports ADMA3 DMA type. + * ADMA3 performs integrated descriptor which is more suitable + * for cmd queuing to fetch both command and transfer descriptors. + */ + if (host->v4_mode && (host->caps1 & SDHCI_CAN_DO_ADMA3)) + ctrl |= SDHCI_CTRL_ADMA3; + else if (host->flags & SDHCI_USE_64_BIT_DMA) + ctrl |= SDHCI_CTRL_ADMA64; + else + ctrl |= SDHCI_CTRL_ADMA32; + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + + sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, 512), + SDHCI_BLOCK_SIZE); + + /* Set maximum timeout */ + sdhci_set_timeout(host, NULL); + + host->ier = host->cqe_ier; + + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); + + host->cqe_on = true; + + pr_debug("%s: sdhci: CQE on, IRQ mask %#x, IRQ status %#x\n", + mmc_hostname(mmc), host->ier, + sdhci_readl(host, SDHCI_INT_STATUS)); + + spin_unlock_irqrestore(&host->lock, flags); +} +EXPORT_SYMBOL_GPL(sdhci_cqe_enable); + +void sdhci_cqe_disable(struct mmc_host *mmc, bool recovery) +{ + struct sdhci_host *host = mmc_priv(mmc); + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + + sdhci_set_default_irqs(host); + + host->cqe_on = false; + + if (recovery) + sdhci_reset_for(host, CQE_RECOVERY); + + pr_debug("%s: sdhci: CQE off, IRQ mask %#x, IRQ status %#x\n", + mmc_hostname(mmc), host->ier, + sdhci_readl(host, SDHCI_INT_STATUS)); + + spin_unlock_irqrestore(&host->lock, flags); +} +EXPORT_SYMBOL_GPL(sdhci_cqe_disable); + +bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error, + int *data_error) +{ + u32 mask; + + if (!host->cqe_on) + return false; + + if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC)) { + *cmd_error = -EILSEQ; + if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)))) + sdhci_err_stats_inc(host, CMD_CRC); + } else if (intmask & SDHCI_INT_TIMEOUT) { + *cmd_error = -ETIMEDOUT; + sdhci_err_stats_inc(host, CMD_TIMEOUT); + } else + *cmd_error = 0; + + if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC)) { + *data_error = -EILSEQ; + if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)))) + sdhci_err_stats_inc(host, DAT_CRC); + } else if (intmask & SDHCI_INT_DATA_TIMEOUT) { + *data_error = -ETIMEDOUT; + sdhci_err_stats_inc(host, DAT_TIMEOUT); + } else if (intmask & SDHCI_INT_ADMA_ERROR) { + *data_error = -EIO; + sdhci_err_stats_inc(host, ADMA); + } else + *data_error = 0; + + /* Clear selected interrupts. */ + mask = intmask & host->cqe_ier; + sdhci_writel(host, mask, SDHCI_INT_STATUS); + + if (intmask & SDHCI_INT_BUS_POWER) + pr_err("%s: Card is consuming too much power!\n", + mmc_hostname(host->mmc)); + + intmask &= ~(host->cqe_ier | SDHCI_INT_ERROR); + if (intmask) { + sdhci_writel(host, intmask, SDHCI_INT_STATUS); + pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n", + mmc_hostname(host->mmc), intmask); + sdhci_err_stats_inc(host, UNEXPECTED_IRQ); + sdhci_dumpregs(host); + } + + return true; +} +EXPORT_SYMBOL_GPL(sdhci_cqe_irq); + +/*****************************************************************************\ + * * + * Device allocation/registration * + * * +\*****************************************************************************/ + +struct sdhci_host *sdhci_alloc_host(struct device *dev, + size_t priv_size) +{ + struct mmc_host *mmc; + struct sdhci_host *host; + + WARN_ON(dev == NULL); + + mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev); + if (!mmc) + return ERR_PTR(-ENOMEM); + + host = mmc_priv(mmc); + host->mmc = mmc; + host->mmc_host_ops = sdhci_ops; + mmc->ops = &host->mmc_host_ops; + + host->flags = SDHCI_SIGNALING_330; + + host->cqe_ier = SDHCI_CQE_INT_MASK; + host->cqe_err_ier = SDHCI_CQE_INT_ERR_MASK; + + host->tuning_delay = -1; + host->tuning_loop_count = MAX_TUNING_LOOP; + + host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG; + + /* + * The DMA table descriptor count is calculated as the maximum + * number of segments times 2, to allow for an alignment + * descriptor for each segment, plus 1 for a nop end descriptor. + */ + host->adma_table_cnt = SDHCI_MAX_SEGS * 2 + 1; + host->max_adma = 65536; + + host->max_timeout_count = 0xE; + + return host; +} + +EXPORT_SYMBOL_GPL(sdhci_alloc_host); + +static int sdhci_set_dma_mask(struct sdhci_host *host) +{ + struct mmc_host *mmc = host->mmc; + struct device *dev = mmc_dev(mmc); + int ret = -EINVAL; + + if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA) + host->flags &= ~SDHCI_USE_64_BIT_DMA; + + /* Try 64-bit mask if hardware is capable of it */ + if (host->flags & SDHCI_USE_64_BIT_DMA) { + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)); + if (ret) { + pr_warn("%s: Failed to set 64-bit DMA mask.\n", + mmc_hostname(mmc)); + host->flags &= ~SDHCI_USE_64_BIT_DMA; + } + } + + /* 32-bit mask as default & fallback */ + if (ret) { + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); + if (ret) + pr_warn("%s: Failed to set 32-bit DMA mask.\n", + mmc_hostname(mmc)); + } + + return ret; +} + +void __sdhci_read_caps(struct sdhci_host *host, const u16 *ver, + const u32 *caps, const u32 *caps1) +{ + u16 v; + u64 dt_caps_mask = 0; + u64 dt_caps = 0; + + if (host->read_caps) + return; + + host->read_caps = true; + + if (debug_quirks) + host->quirks = debug_quirks; + + if (debug_quirks2) + host->quirks2 = debug_quirks2; + + sdhci_reset_for_all(host); + + if (host->v4_mode) + sdhci_do_enable_v4_mode(host); + + device_property_read_u64(mmc_dev(host->mmc), + "sdhci-caps-mask", &dt_caps_mask); + device_property_read_u64(mmc_dev(host->mmc), + "sdhci-caps", &dt_caps); + + v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION); + host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT; + + if (host->quirks & SDHCI_QUIRK_MISSING_CAPS) + return; + + if (caps) { + host->caps = *caps; + } else { + host->caps = sdhci_readl(host, SDHCI_CAPABILITIES); + host->caps &= ~lower_32_bits(dt_caps_mask); + host->caps |= lower_32_bits(dt_caps); + } + + if (host->version < SDHCI_SPEC_300) + return; + + if (caps1) { + host->caps1 = *caps1; + } else { + host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1); + host->caps1 &= ~upper_32_bits(dt_caps_mask); + host->caps1 |= upper_32_bits(dt_caps); + } +} +EXPORT_SYMBOL_GPL(__sdhci_read_caps); + +static void sdhci_allocate_bounce_buffer(struct sdhci_host *host) +{ + struct mmc_host *mmc = host->mmc; + unsigned int max_blocks; + unsigned int bounce_size; + int ret; + + /* + * Cap the bounce buffer at 64KB. Using a bigger bounce buffer + * has diminishing returns, this is probably because SD/MMC + * cards are usually optimized to handle this size of requests. + */ + bounce_size = SZ_64K; + /* + * Adjust downwards to maximum request size if this is less + * than our segment size, else hammer down the maximum + * request size to the maximum buffer size. + */ + if (mmc->max_req_size < bounce_size) + bounce_size = mmc->max_req_size; + max_blocks = bounce_size / 512; + + /* + * When we just support one segment, we can get significant + * speedups by the help of a bounce buffer to group scattered + * reads/writes together. + */ + host->bounce_buffer = devm_kmalloc(mmc_dev(mmc), + bounce_size, + GFP_KERNEL); + if (!host->bounce_buffer) { + pr_err("%s: failed to allocate %u bytes for bounce buffer, falling back to single segments\n", + mmc_hostname(mmc), + bounce_size); + /* + * Exiting with zero here makes sure we proceed with + * mmc->max_segs == 1. + */ + return; + } + + host->bounce_addr = dma_map_single(mmc_dev(mmc), + host->bounce_buffer, + bounce_size, + DMA_BIDIRECTIONAL); + ret = dma_mapping_error(mmc_dev(mmc), host->bounce_addr); + if (ret) { + devm_kfree(mmc_dev(mmc), host->bounce_buffer); + host->bounce_buffer = NULL; + /* Again fall back to max_segs == 1 */ + return; + } + + host->bounce_buffer_size = bounce_size; + + /* Lie about this since we're bouncing */ + mmc->max_segs = max_blocks; + mmc->max_seg_size = bounce_size; + mmc->max_req_size = bounce_size; + + pr_info("%s bounce up to %u segments into one, max segment size %u bytes\n", + mmc_hostname(mmc), max_blocks, bounce_size); +} + +static inline bool sdhci_can_64bit_dma(struct sdhci_host *host) +{ + /* + * According to SD Host Controller spec v4.10, bit[27] added from + * version 4.10 in Capabilities Register is used as 64-bit System + * Address support for V4 mode. + */ + if (host->version >= SDHCI_SPEC_410 && host->v4_mode) + return host->caps & SDHCI_CAN_64BIT_V4; + + return host->caps & SDHCI_CAN_64BIT; +} + +int sdhci_setup_host(struct sdhci_host *host) +{ + struct mmc_host *mmc; + u32 max_current_caps; + unsigned int ocr_avail; + unsigned int override_timeout_clk; + u32 max_clk; + int ret = 0; + bool enable_vqmmc = false; + + WARN_ON(host == NULL); + if (host == NULL) + return -EINVAL; + + mmc = host->mmc; + + /* + * If there are external regulators, get them. Note this must be done + * early before resetting the host and reading the capabilities so that + * the host can take the appropriate action if regulators are not + * available. + */ + if (!mmc->supply.vqmmc) { + ret = mmc_regulator_get_supply(mmc); + if (ret) + return ret; + enable_vqmmc = true; + } + + DBG("Version: 0x%08x | Present: 0x%08x\n", + sdhci_readw(host, SDHCI_HOST_VERSION), + sdhci_readl(host, SDHCI_PRESENT_STATE)); + DBG("Caps: 0x%08x | Caps_1: 0x%08x\n", + sdhci_readl(host, SDHCI_CAPABILITIES), + sdhci_readl(host, SDHCI_CAPABILITIES_1)); + + sdhci_read_caps(host); + + override_timeout_clk = host->timeout_clk; + + if (host->version > SDHCI_SPEC_420) { + pr_err("%s: Unknown controller version (%d). You may experience problems.\n", + mmc_hostname(mmc), host->version); + } + + if (host->quirks & SDHCI_QUIRK_FORCE_DMA) + host->flags |= SDHCI_USE_SDMA; + else if (!(host->caps & SDHCI_CAN_DO_SDMA)) + DBG("Controller doesn't have SDMA capability\n"); + else + host->flags |= SDHCI_USE_SDMA; + + if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) && + (host->flags & SDHCI_USE_SDMA)) { + DBG("Disabling DMA as it is marked broken\n"); + host->flags &= ~SDHCI_USE_SDMA; + } + + if ((host->version >= SDHCI_SPEC_200) && + (host->caps & SDHCI_CAN_DO_ADMA2)) + host->flags |= SDHCI_USE_ADMA; + + if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) && + (host->flags & SDHCI_USE_ADMA)) { + DBG("Disabling ADMA as it is marked broken\n"); + host->flags &= ~SDHCI_USE_ADMA; + } + + if (sdhci_can_64bit_dma(host)) + host->flags |= SDHCI_USE_64_BIT_DMA; + + if (host->use_external_dma) { + ret = sdhci_external_dma_init(host); + if (ret == -EPROBE_DEFER) + goto unreg; + /* + * Fall back to use the DMA/PIO integrated in standard SDHCI + * instead of external DMA devices. + */ + else if (ret) + sdhci_switch_external_dma(host, false); + /* Disable internal DMA sources */ + else + host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA); + } + + if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { + if (host->ops->set_dma_mask) + ret = host->ops->set_dma_mask(host); + else + ret = sdhci_set_dma_mask(host); + + if (!ret && host->ops->enable_dma) + ret = host->ops->enable_dma(host); + + if (ret) { + pr_warn("%s: No suitable DMA available - falling back to PIO\n", + mmc_hostname(mmc)); + host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA); + + ret = 0; + } + } + + /* SDMA does not support 64-bit DMA if v4 mode not set */ + if ((host->flags & SDHCI_USE_64_BIT_DMA) && !host->v4_mode) + host->flags &= ~SDHCI_USE_SDMA; + + if (host->flags & SDHCI_USE_ADMA) { + dma_addr_t dma; + void *buf; + + if (!(host->flags & SDHCI_USE_64_BIT_DMA)) + host->alloc_desc_sz = SDHCI_ADMA2_32_DESC_SZ; + else if (!host->alloc_desc_sz) + host->alloc_desc_sz = SDHCI_ADMA2_64_DESC_SZ(host); + + host->desc_sz = host->alloc_desc_sz; + host->adma_table_sz = host->adma_table_cnt * host->desc_sz; + + host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN; + /* + * Use zalloc to zero the reserved high 32-bits of 128-bit + * descriptors so that they never need to be written. + */ + buf = dma_alloc_coherent(mmc_dev(mmc), + host->align_buffer_sz + host->adma_table_sz, + &dma, GFP_KERNEL); + if (!buf) { + pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n", + mmc_hostname(mmc)); + host->flags &= ~SDHCI_USE_ADMA; + } else if ((dma + host->align_buffer_sz) & + (SDHCI_ADMA2_DESC_ALIGN - 1)) { + pr_warn("%s: unable to allocate aligned ADMA descriptor\n", + mmc_hostname(mmc)); + host->flags &= ~SDHCI_USE_ADMA; + dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz + + host->adma_table_sz, buf, dma); + } else { + host->align_buffer = buf; + host->align_addr = dma; + + host->adma_table = buf + host->align_buffer_sz; + host->adma_addr = dma + host->align_buffer_sz; + } + } + + /* + * If we use DMA, then it's up to the caller to set the DMA + * mask, but PIO does not need the hw shim so we set a new + * mask here in that case. + */ + if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) { + host->dma_mask = DMA_BIT_MASK(64); + mmc_dev(mmc)->dma_mask = &host->dma_mask; + } + + if (host->version >= SDHCI_SPEC_300) + host->max_clk = FIELD_GET(SDHCI_CLOCK_V3_BASE_MASK, host->caps); + else + host->max_clk = FIELD_GET(SDHCI_CLOCK_BASE_MASK, host->caps); + + host->max_clk *= 1000000; + if (host->max_clk == 0 || host->quirks & + SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) { + if (!host->ops->get_max_clock) { + pr_err("%s: Hardware doesn't specify base clock frequency.\n", + mmc_hostname(mmc)); + ret = -ENODEV; + goto undma; + } + host->max_clk = host->ops->get_max_clock(host); + } + + /* + * In case of Host Controller v3.00, find out whether clock + * multiplier is supported. + */ + host->clk_mul = FIELD_GET(SDHCI_CLOCK_MUL_MASK, host->caps1); + + /* + * In case the value in Clock Multiplier is 0, then programmable + * clock mode is not supported, otherwise the actual clock + * multiplier is one more than the value of Clock Multiplier + * in the Capabilities Register. + */ + if (host->clk_mul) + host->clk_mul += 1; + + /* + * Set host parameters. + */ + max_clk = host->max_clk; + + if (host->ops->get_min_clock) + mmc->f_min = host->ops->get_min_clock(host); + else if (host->version >= SDHCI_SPEC_300) { + if (host->clk_mul) + max_clk = host->max_clk * host->clk_mul; + /* + * Divided Clock Mode minimum clock rate is always less than + * Programmable Clock Mode minimum clock rate. + */ + mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300; + } else + mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200; + + if (!mmc->f_max || mmc->f_max > max_clk) + mmc->f_max = max_clk; + + if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) { + host->timeout_clk = FIELD_GET(SDHCI_TIMEOUT_CLK_MASK, host->caps); + + if (host->caps & SDHCI_TIMEOUT_CLK_UNIT) + host->timeout_clk *= 1000; + + if (host->timeout_clk == 0) { + if (!host->ops->get_timeout_clock) { + pr_err("%s: Hardware doesn't specify timeout clock frequency.\n", + mmc_hostname(mmc)); + ret = -ENODEV; + goto undma; + } + + host->timeout_clk = + DIV_ROUND_UP(host->ops->get_timeout_clock(host), + 1000); + } + + if (override_timeout_clk) + host->timeout_clk = override_timeout_clk; + + mmc->max_busy_timeout = host->ops->get_max_timeout_count ? + host->ops->get_max_timeout_count(host) : 1 << 27; + mmc->max_busy_timeout /= host->timeout_clk; + } + + if (host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT && + !host->ops->get_max_timeout_count) + mmc->max_busy_timeout = 0; + + mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_CMD23; + mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD; + + if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) + host->flags |= SDHCI_AUTO_CMD12; + + /* + * For v3 mode, Auto-CMD23 stuff only works in ADMA or PIO. + * For v4 mode, SDMA may use Auto-CMD23 as well. + */ + if ((host->version >= SDHCI_SPEC_300) && + ((host->flags & SDHCI_USE_ADMA) || + !(host->flags & SDHCI_USE_SDMA) || host->v4_mode) && + !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) { + host->flags |= SDHCI_AUTO_CMD23; + DBG("Auto-CMD23 available\n"); + } else { + DBG("Auto-CMD23 unavailable\n"); + } + + /* + * A controller may support 8-bit width, but the board itself + * might not have the pins brought out. Boards that support + * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in + * their platform code before calling sdhci_add_host(), and we + * won't assume 8-bit width for hosts without that CAP. + */ + if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA)) + mmc->caps |= MMC_CAP_4_BIT_DATA; + + if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23) + mmc->caps &= ~MMC_CAP_CMD23; + + if (host->caps & SDHCI_CAN_DO_HISPD) + mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED; + + if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) && + mmc_card_is_removable(mmc) && + mmc_gpio_get_cd(mmc) < 0) + mmc->caps |= MMC_CAP_NEEDS_POLL; + + if (!IS_ERR(mmc->supply.vqmmc)) { + if (enable_vqmmc) { + ret = regulator_enable(mmc->supply.vqmmc); + host->sdhci_core_to_disable_vqmmc = !ret; + } + + /* If vqmmc provides no 1.8V signalling, then there's no UHS */ + if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000, + 1950000)) + host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | + SDHCI_SUPPORT_SDR50 | + SDHCI_SUPPORT_DDR50); + + /* In eMMC case vqmmc might be a fixed 1.8V regulator */ + if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000, + 3600000)) + host->flags &= ~SDHCI_SIGNALING_330; + + if (ret) { + pr_warn("%s: Failed to enable vqmmc regulator: %d\n", + mmc_hostname(mmc), ret); + mmc->supply.vqmmc = ERR_PTR(-EINVAL); + } + + } + + if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) { + host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | + SDHCI_SUPPORT_DDR50); + /* + * The SDHCI controller in a SoC might support HS200/HS400 + * (indicated using mmc-hs200-1_8v/mmc-hs400-1_8v dt property), + * but if the board is modeled such that the IO lines are not + * connected to 1.8v then HS200/HS400 cannot be supported. + * Disable HS200/HS400 if the board does not have 1.8v connected + * to the IO lines. (Applicable for other modes in 1.8v) + */ + mmc->caps2 &= ~(MMC_CAP2_HSX00_1_8V | MMC_CAP2_HS400_ES); + mmc->caps &= ~(MMC_CAP_1_8V_DDR | MMC_CAP_UHS); + } + + /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */ + if (host->caps1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | + SDHCI_SUPPORT_DDR50)) + mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25; + + /* SDR104 supports also implies SDR50 support */ + if (host->caps1 & SDHCI_SUPPORT_SDR104) { + mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50; + /* SD3.0: SDR104 is supported so (for eMMC) the caps2 + * field can be promoted to support HS200. + */ + if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200)) + mmc->caps2 |= MMC_CAP2_HS200; + } else if (host->caps1 & SDHCI_SUPPORT_SDR50) { + mmc->caps |= MMC_CAP_UHS_SDR50; + } + + if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 && + (host->caps1 & SDHCI_SUPPORT_HS400)) + mmc->caps2 |= MMC_CAP2_HS400; + + if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) && + (IS_ERR(mmc->supply.vqmmc) || + !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000, + 1300000))) + mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V; + + if ((host->caps1 & SDHCI_SUPPORT_DDR50) && + !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50)) + mmc->caps |= MMC_CAP_UHS_DDR50; + + /* Does the host need tuning for SDR50? */ + if (host->caps1 & SDHCI_USE_SDR50_TUNING) + host->flags |= SDHCI_SDR50_NEEDS_TUNING; + + /* Driver Type(s) (A, C, D) supported by the host */ + if (host->caps1 & SDHCI_DRIVER_TYPE_A) + mmc->caps |= MMC_CAP_DRIVER_TYPE_A; + if (host->caps1 & SDHCI_DRIVER_TYPE_C) + mmc->caps |= MMC_CAP_DRIVER_TYPE_C; + if (host->caps1 & SDHCI_DRIVER_TYPE_D) + mmc->caps |= MMC_CAP_DRIVER_TYPE_D; + + /* Initial value for re-tuning timer count */ + host->tuning_count = FIELD_GET(SDHCI_RETUNING_TIMER_COUNT_MASK, + host->caps1); + + /* + * In case Re-tuning Timer is not disabled, the actual value of + * re-tuning timer will be 2 ^ (n - 1). + */ + if (host->tuning_count) + host->tuning_count = 1 << (host->tuning_count - 1); + + /* Re-tuning mode supported by the Host Controller */ + host->tuning_mode = FIELD_GET(SDHCI_RETUNING_MODE_MASK, host->caps1); + + ocr_avail = 0; + + /* + * According to SD Host Controller spec v3.00, if the Host System + * can afford more than 150mA, Host Driver should set XPC to 1. Also + * the value is meaningful only if Voltage Support in the Capabilities + * register is set. The actual current value is 4 times the register + * value. + */ + max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT); + if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) { + int curr = regulator_get_current_limit(mmc->supply.vmmc); + if (curr > 0) { + + /* convert to SDHCI_MAX_CURRENT format */ + curr = curr/1000; /* convert to mA */ + curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER; + + curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT); + max_current_caps = + FIELD_PREP(SDHCI_MAX_CURRENT_330_MASK, curr) | + FIELD_PREP(SDHCI_MAX_CURRENT_300_MASK, curr) | + FIELD_PREP(SDHCI_MAX_CURRENT_180_MASK, curr); + } + } + + if (host->caps & SDHCI_CAN_VDD_330) { + ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34; + + mmc->max_current_330 = FIELD_GET(SDHCI_MAX_CURRENT_330_MASK, + max_current_caps) * + SDHCI_MAX_CURRENT_MULTIPLIER; + } + if (host->caps & SDHCI_CAN_VDD_300) { + ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31; + + mmc->max_current_300 = FIELD_GET(SDHCI_MAX_CURRENT_300_MASK, + max_current_caps) * + SDHCI_MAX_CURRENT_MULTIPLIER; + } + if (host->caps & SDHCI_CAN_VDD_180) { + ocr_avail |= MMC_VDD_165_195; + + mmc->max_current_180 = FIELD_GET(SDHCI_MAX_CURRENT_180_MASK, + max_current_caps) * + SDHCI_MAX_CURRENT_MULTIPLIER; + } + + /* If OCR set by host, use it instead. */ + if (host->ocr_mask) + ocr_avail = host->ocr_mask; + + /* If OCR set by external regulators, give it highest prio. */ + if (mmc->ocr_avail) + ocr_avail = mmc->ocr_avail; + + mmc->ocr_avail = ocr_avail; + mmc->ocr_avail_sdio = ocr_avail; + if (host->ocr_avail_sdio) + mmc->ocr_avail_sdio &= host->ocr_avail_sdio; + mmc->ocr_avail_sd = ocr_avail; + if (host->ocr_avail_sd) + mmc->ocr_avail_sd &= host->ocr_avail_sd; + else /* normal SD controllers don't support 1.8V */ + mmc->ocr_avail_sd &= ~MMC_VDD_165_195; + mmc->ocr_avail_mmc = ocr_avail; + if (host->ocr_avail_mmc) + mmc->ocr_avail_mmc &= host->ocr_avail_mmc; + + if (mmc->ocr_avail == 0) { + pr_err("%s: Hardware doesn't report any support voltages.\n", + mmc_hostname(mmc)); + ret = -ENODEV; + goto unreg; + } + + if ((mmc->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | + MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR)) || + (mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V))) + host->flags |= SDHCI_SIGNALING_180; + + if (mmc->caps2 & MMC_CAP2_HSX00_1_2V) + host->flags |= SDHCI_SIGNALING_120; + + spin_lock_init(&host->lock); + + /* + * Maximum number of sectors in one transfer. Limited by SDMA boundary + * size (512KiB). Note some tuning modes impose a 4MiB limit, but this + * is less anyway. + */ + mmc->max_req_size = 524288; + + /* + * Maximum number of segments. Depends on if the hardware + * can do scatter/gather or not. + */ + if (host->flags & SDHCI_USE_ADMA) { + mmc->max_segs = SDHCI_MAX_SEGS; + } else if (host->flags & SDHCI_USE_SDMA) { + mmc->max_segs = 1; + mmc->max_req_size = min_t(size_t, mmc->max_req_size, + dma_max_mapping_size(mmc_dev(mmc))); + } else { /* PIO */ + mmc->max_segs = SDHCI_MAX_SEGS; + } + + /* + * Maximum segment size. Could be one segment with the maximum number + * of bytes. When doing hardware scatter/gather, each entry cannot + * be larger than 64 KiB though. + */ + if (host->flags & SDHCI_USE_ADMA) { + if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC) { + host->max_adma = 65532; /* 32-bit alignment */ + mmc->max_seg_size = 65535; + } else { + mmc->max_seg_size = 65536; + } + } else { + mmc->max_seg_size = mmc->max_req_size; + } + + /* + * Maximum block size. This varies from controller to controller and + * is specified in the capabilities register. + */ + if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) { + mmc->max_blk_size = 2; + } else { + mmc->max_blk_size = (host->caps & SDHCI_MAX_BLOCK_MASK) >> + SDHCI_MAX_BLOCK_SHIFT; + if (mmc->max_blk_size >= 3) { + pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n", + mmc_hostname(mmc)); + mmc->max_blk_size = 0; + } + } + + mmc->max_blk_size = 512 << mmc->max_blk_size; + + /* + * Maximum block count. + */ + mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535; + + if (mmc->max_segs == 1) + /* This may alter mmc->*_blk_* parameters */ + sdhci_allocate_bounce_buffer(host); + + return 0; + +unreg: + if (host->sdhci_core_to_disable_vqmmc) + regulator_disable(mmc->supply.vqmmc); +undma: + if (host->align_buffer) + dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz + + host->adma_table_sz, host->align_buffer, + host->align_addr); + host->adma_table = NULL; + host->align_buffer = NULL; + + return ret; +} +EXPORT_SYMBOL_GPL(sdhci_setup_host); + +void sdhci_cleanup_host(struct sdhci_host *host) +{ + struct mmc_host *mmc = host->mmc; + + if (host->sdhci_core_to_disable_vqmmc) + regulator_disable(mmc->supply.vqmmc); + + if (host->align_buffer) + dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz + + host->adma_table_sz, host->align_buffer, + host->align_addr); + + if (host->use_external_dma) + sdhci_external_dma_release(host); + + host->adma_table = NULL; + host->align_buffer = NULL; +} +EXPORT_SYMBOL_GPL(sdhci_cleanup_host); + +int __sdhci_add_host(struct sdhci_host *host) +{ + unsigned int flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI; + struct mmc_host *mmc = host->mmc; + int ret; + + if ((mmc->caps2 & MMC_CAP2_CQE) && + (host->quirks & SDHCI_QUIRK_BROKEN_CQE)) { + mmc->caps2 &= ~MMC_CAP2_CQE; + mmc->cqe_ops = NULL; + } + + host->complete_wq = alloc_workqueue("sdhci", flags, 0); + if (!host->complete_wq) + return -ENOMEM; + + INIT_WORK(&host->complete_work, sdhci_complete_work); + + timer_setup(&host->timer, sdhci_timeout_timer, 0); + timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0); + + init_waitqueue_head(&host->buf_ready_int); + + sdhci_init(host, 0); + + ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq, + IRQF_SHARED, mmc_hostname(mmc), host); + if (ret) { + pr_err("%s: Failed to request IRQ %d: %d\n", + mmc_hostname(mmc), host->irq, ret); + goto unwq; + } + + ret = sdhci_led_register(host); + if (ret) { + pr_err("%s: Failed to register LED device: %d\n", + mmc_hostname(mmc), ret); + goto unirq; + } + + ret = mmc_add_host(mmc); + if (ret) + goto unled; + + pr_info("%s: SDHCI controller on %s [%s] using %s\n", + mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)), + host->use_external_dma ? "External DMA" : + (host->flags & SDHCI_USE_ADMA) ? + (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" : + (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO"); + + sdhci_enable_card_detection(host); + + return 0; + +unled: + sdhci_led_unregister(host); +unirq: + sdhci_reset_for_all(host); + sdhci_writel(host, 0, SDHCI_INT_ENABLE); + sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); + free_irq(host->irq, host); +unwq: + destroy_workqueue(host->complete_wq); + + return ret; +} +EXPORT_SYMBOL_GPL(__sdhci_add_host); + +int sdhci_add_host(struct sdhci_host *host) +{ + int ret; + + ret = sdhci_setup_host(host); + if (ret) + return ret; + + ret = __sdhci_add_host(host); + if (ret) + goto cleanup; + + return 0; + +cleanup: + sdhci_cleanup_host(host); + + return ret; +} +EXPORT_SYMBOL_GPL(sdhci_add_host); + +void sdhci_remove_host(struct sdhci_host *host, int dead) +{ + struct mmc_host *mmc = host->mmc; + unsigned long flags; + + if (dead) { + spin_lock_irqsave(&host->lock, flags); + + host->flags |= SDHCI_DEVICE_DEAD; + + if (sdhci_has_requests(host)) { + pr_err("%s: Controller removed during " + " transfer!\n", mmc_hostname(mmc)); + sdhci_error_out_mrqs(host, -ENOMEDIUM); + } + + spin_unlock_irqrestore(&host->lock, flags); + } + + sdhci_disable_card_detection(host); + + mmc_remove_host(mmc); + + sdhci_led_unregister(host); + + if (!dead) + sdhci_reset_for_all(host); + + sdhci_writel(host, 0, SDHCI_INT_ENABLE); + sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE); + free_irq(host->irq, host); + + del_timer_sync(&host->timer); + del_timer_sync(&host->data_timer); + + destroy_workqueue(host->complete_wq); + + if (host->sdhci_core_to_disable_vqmmc) + regulator_disable(mmc->supply.vqmmc); + + if (host->align_buffer) + dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz + + host->adma_table_sz, host->align_buffer, + host->align_addr); + + if (host->use_external_dma) + sdhci_external_dma_release(host); + + host->adma_table = NULL; + host->align_buffer = NULL; +} + +EXPORT_SYMBOL_GPL(sdhci_remove_host); + +void sdhci_free_host(struct sdhci_host *host) +{ + mmc_free_host(host->mmc); +} + +EXPORT_SYMBOL_GPL(sdhci_free_host); + +/*****************************************************************************\ + * * + * Driver init/exit * + * * +\*****************************************************************************/ + +static int __init sdhci_drv_init(void) +{ + pr_info(DRIVER_NAME + ": Secure Digital Host Controller Interface driver\n"); + pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); + + return 0; +} + +static void __exit sdhci_drv_exit(void) +{ +} + +module_init(sdhci_drv_init); +module_exit(sdhci_drv_exit); + +module_param(debug_quirks, uint, 0444); +module_param(debug_quirks2, uint, 0444); + +MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>"); +MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver"); +MODULE_LICENSE("GPL"); + +MODULE_PARM_DESC(debug_quirks, "Force certain quirks."); +MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks."); |