diff options
Diffstat (limited to 'drivers/net/wireless/marvell/libertas/if_sdio.c')
| -rw-r--r-- | drivers/net/wireless/marvell/libertas/if_sdio.c | 1416 |
1 files changed, 1416 insertions, 0 deletions
diff --git a/drivers/net/wireless/marvell/libertas/if_sdio.c b/drivers/net/wireless/marvell/libertas/if_sdio.c new file mode 100644 index 000000000..a63c5e622 --- /dev/null +++ b/drivers/net/wireless/marvell/libertas/if_sdio.c @@ -0,0 +1,1416 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * linux/drivers/net/wireless/libertas/if_sdio.c + * + * Copyright 2007-2008 Pierre Ossman + * + * Inspired by if_cs.c, Copyright 2007 Holger Schurig + * + * This hardware has more or less no CMD53 support, so all registers + * must be accessed using sdio_readb()/sdio_writeb(). + * + * Transfers must be in one transaction or the firmware goes bonkers. + * This means that the transfer must either be small enough to do a + * byte based transfer or it must be padded to a multiple of the + * current block size. + * + * As SDIO is still new to the kernel, it is unfortunately common with + * bugs in the host controllers related to that. One such bug is that + * controllers cannot do transfers that aren't a multiple of 4 bytes. + * If you don't have time to fix the host controller driver, you can + * work around the problem by modifying if_sdio_host_to_card() and + * if_sdio_card_to_host() to pad the data. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/firmware.h> +#include <linux/netdevice.h> +#include <linux/delay.h> +#include <linux/mmc/card.h> +#include <linux/mmc/sdio_func.h> +#include <linux/mmc/sdio_ids.h> +#include <linux/mmc/sdio.h> +#include <linux/mmc/host.h> +#include <linux/pm_runtime.h> + +#include "host.h" +#include "decl.h" +#include "defs.h" +#include "dev.h" +#include "cmd.h" +#include "if_sdio.h" + +static void if_sdio_interrupt(struct sdio_func *func); + +/* The if_sdio_remove() callback function is called when + * user removes this module from kernel space or ejects + * the card from the slot. The driver handles these 2 cases + * differently for SD8688 combo chip. + * If the user is removing the module, the FUNC_SHUTDOWN + * command for SD8688 is sent to the firmware. + * If the card is removed, there is no need to send this command. + * + * The variable 'user_rmmod' is used to distinguish these two + * scenarios. This flag is initialized as FALSE in case the card + * is removed, and will be set to TRUE for module removal when + * module_exit function is called. + */ +static u8 user_rmmod; + +static const struct sdio_device_id if_sdio_ids[] = { + { SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, + SDIO_DEVICE_ID_MARVELL_LIBERTAS) }, + { SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, + SDIO_DEVICE_ID_MARVELL_8688_WLAN) }, + { /* end: all zeroes */ }, +}; + +MODULE_DEVICE_TABLE(sdio, if_sdio_ids); + +#define MODEL_8385 0x04 +#define MODEL_8686 0x0b +#define MODEL_8688 0x10 + +static const struct lbs_fw_table fw_table[] = { + { MODEL_8385, "libertas/sd8385_helper.bin", "libertas/sd8385.bin" }, + { MODEL_8385, "sd8385_helper.bin", "sd8385.bin" }, + { MODEL_8686, "libertas/sd8686_v9_helper.bin", "libertas/sd8686_v9.bin" }, + { MODEL_8686, "libertas/sd8686_v8_helper.bin", "libertas/sd8686_v8.bin" }, + { MODEL_8686, "sd8686_helper.bin", "sd8686.bin" }, + { MODEL_8688, "libertas/sd8688_helper.bin", "libertas/sd8688.bin" }, + { MODEL_8688, "sd8688_helper.bin", "sd8688.bin" }, + { 0, NULL, NULL } +}; +MODULE_FIRMWARE("libertas/sd8385_helper.bin"); +MODULE_FIRMWARE("libertas/sd8385.bin"); +MODULE_FIRMWARE("sd8385_helper.bin"); +MODULE_FIRMWARE("sd8385.bin"); +MODULE_FIRMWARE("libertas/sd8686_v9_helper.bin"); +MODULE_FIRMWARE("libertas/sd8686_v9.bin"); +MODULE_FIRMWARE("libertas/sd8686_v8_helper.bin"); +MODULE_FIRMWARE("libertas/sd8686_v8.bin"); +MODULE_FIRMWARE("sd8686_helper.bin"); +MODULE_FIRMWARE("sd8686.bin"); +MODULE_FIRMWARE("libertas/sd8688_helper.bin"); +MODULE_FIRMWARE("libertas/sd8688.bin"); +MODULE_FIRMWARE("sd8688_helper.bin"); +MODULE_FIRMWARE("sd8688.bin"); + +struct if_sdio_packet { + struct if_sdio_packet *next; + u16 nb; + u8 buffer[] __aligned(4); +}; + +struct if_sdio_card { + struct sdio_func *func; + struct lbs_private *priv; + + int model; + unsigned long ioport; + unsigned int scratch_reg; + bool started; + wait_queue_head_t pwron_waitq; + + u8 buffer[65536] __attribute__((aligned(4))); + + spinlock_t lock; + struct if_sdio_packet *packets; + + struct workqueue_struct *workqueue; + struct work_struct packet_worker; + + u8 rx_unit; +}; + +static void if_sdio_finish_power_on(struct if_sdio_card *card); +static int if_sdio_power_off(struct if_sdio_card *card); + +/********************************************************************/ +/* I/O */ +/********************************************************************/ + +/* + * For SD8385/SD8686, this function reads firmware status after + * the image is downloaded, or reads RX packet length when + * interrupt (with IF_SDIO_H_INT_UPLD bit set) is received. + * For SD8688, this function reads firmware status only. + */ +static u16 if_sdio_read_scratch(struct if_sdio_card *card, int *err) +{ + int ret; + u16 scratch; + + scratch = sdio_readb(card->func, card->scratch_reg, &ret); + if (!ret) + scratch |= sdio_readb(card->func, card->scratch_reg + 1, + &ret) << 8; + + if (err) + *err = ret; + + if (ret) + return 0xffff; + + return scratch; +} + +static u8 if_sdio_read_rx_unit(struct if_sdio_card *card) +{ + int ret; + u8 rx_unit; + + rx_unit = sdio_readb(card->func, IF_SDIO_RX_UNIT, &ret); + + if (ret) + rx_unit = 0; + + return rx_unit; +} + +static u16 if_sdio_read_rx_len(struct if_sdio_card *card, int *err) +{ + int ret; + u16 rx_len; + + switch (card->model) { + case MODEL_8385: + case MODEL_8686: + rx_len = if_sdio_read_scratch(card, &ret); + break; + case MODEL_8688: + default: /* for newer chipsets */ + rx_len = sdio_readb(card->func, IF_SDIO_RX_LEN, &ret); + if (!ret) + rx_len <<= card->rx_unit; + else + rx_len = 0xffff; /* invalid length */ + + break; + } + + if (err) + *err = ret; + + return rx_len; +} + +static int if_sdio_handle_cmd(struct if_sdio_card *card, + u8 *buffer, unsigned size) +{ + struct lbs_private *priv = card->priv; + int ret; + unsigned long flags; + u8 i; + + if (size > LBS_CMD_BUFFER_SIZE) { + lbs_deb_sdio("response packet too large (%d bytes)\n", + (int)size); + ret = -E2BIG; + goto out; + } + + spin_lock_irqsave(&priv->driver_lock, flags); + + i = (priv->resp_idx == 0) ? 1 : 0; + BUG_ON(priv->resp_len[i]); + priv->resp_len[i] = size; + memcpy(priv->resp_buf[i], buffer, size); + lbs_notify_command_response(priv, i); + + spin_unlock_irqrestore(&priv->driver_lock, flags); + + ret = 0; + +out: + return ret; +} + +static int if_sdio_handle_data(struct if_sdio_card *card, + u8 *buffer, unsigned size) +{ + int ret; + struct sk_buff *skb; + + if (size > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) { + lbs_deb_sdio("response packet too large (%d bytes)\n", + (int)size); + ret = -E2BIG; + goto out; + } + + skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE + NET_IP_ALIGN); + if (!skb) { + ret = -ENOMEM; + goto out; + } + + skb_reserve(skb, NET_IP_ALIGN); + + skb_put_data(skb, buffer, size); + + lbs_process_rxed_packet(card->priv, skb); + + ret = 0; + +out: + return ret; +} + +static int if_sdio_handle_event(struct if_sdio_card *card, + u8 *buffer, unsigned size) +{ + int ret; + u32 event; + + if (card->model == MODEL_8385) { + event = sdio_readb(card->func, IF_SDIO_EVENT, &ret); + if (ret) + goto out; + + /* right shift 3 bits to get the event id */ + event >>= 3; + } else { + if (size < 4) { + lbs_deb_sdio("event packet too small (%d bytes)\n", + (int)size); + ret = -EINVAL; + goto out; + } + event = buffer[3] << 24; + event |= buffer[2] << 16; + event |= buffer[1] << 8; + event |= buffer[0] << 0; + } + + lbs_queue_event(card->priv, event & 0xFF); + ret = 0; + +out: + return ret; +} + +static int if_sdio_wait_status(struct if_sdio_card *card, const u8 condition) +{ + u8 status; + unsigned long timeout; + int ret = 0; + + timeout = jiffies + HZ; + while (1) { + status = sdio_readb(card->func, IF_SDIO_STATUS, &ret); + if (ret) + return ret; + if ((status & condition) == condition) + break; + if (time_after(jiffies, timeout)) + return -ETIMEDOUT; + mdelay(1); + } + return ret; +} + +static int if_sdio_card_to_host(struct if_sdio_card *card) +{ + int ret; + u16 size, type, chunk; + + size = if_sdio_read_rx_len(card, &ret); + if (ret) + goto out; + + if (size < 4) { + lbs_deb_sdio("invalid packet size (%d bytes) from firmware\n", + (int)size); + ret = -EINVAL; + goto out; + } + + ret = if_sdio_wait_status(card, IF_SDIO_IO_RDY); + if (ret) + goto out; + + /* + * The transfer must be in one transaction or the firmware + * goes suicidal. There's no way to guarantee that for all + * controllers, but we can at least try. + */ + chunk = sdio_align_size(card->func, size); + + ret = sdio_readsb(card->func, card->buffer, card->ioport, chunk); + if (ret) + goto out; + + chunk = card->buffer[0] | (card->buffer[1] << 8); + type = card->buffer[2] | (card->buffer[3] << 8); + + lbs_deb_sdio("packet of type %d and size %d bytes\n", + (int)type, (int)chunk); + + if (chunk > size) { + lbs_deb_sdio("packet fragment (%d > %d)\n", + (int)chunk, (int)size); + ret = -EINVAL; + goto out; + } + + if (chunk < size) { + lbs_deb_sdio("packet fragment (%d < %d)\n", + (int)chunk, (int)size); + } + + switch (type) { + case MVMS_CMD: + ret = if_sdio_handle_cmd(card, card->buffer + 4, chunk - 4); + if (ret) + goto out; + break; + case MVMS_DAT: + ret = if_sdio_handle_data(card, card->buffer + 4, chunk - 4); + if (ret) + goto out; + break; + case MVMS_EVENT: + ret = if_sdio_handle_event(card, card->buffer + 4, chunk - 4); + if (ret) + goto out; + break; + default: + lbs_deb_sdio("invalid type (%d) from firmware\n", + (int)type); + ret = -EINVAL; + goto out; + } + +out: + if (ret) + pr_err("problem fetching packet from firmware\n"); + + return ret; +} + +static void if_sdio_host_to_card_worker(struct work_struct *work) +{ + struct if_sdio_card *card; + struct if_sdio_packet *packet; + int ret; + unsigned long flags; + + card = container_of(work, struct if_sdio_card, packet_worker); + + while (1) { + spin_lock_irqsave(&card->lock, flags); + packet = card->packets; + if (packet) + card->packets = packet->next; + spin_unlock_irqrestore(&card->lock, flags); + + if (!packet) + break; + + sdio_claim_host(card->func); + + ret = if_sdio_wait_status(card, IF_SDIO_IO_RDY); + if (ret == 0) { + ret = sdio_writesb(card->func, card->ioport, + packet->buffer, packet->nb); + } + + if (ret) + pr_err("error %d sending packet to firmware\n", ret); + + sdio_release_host(card->func); + + kfree(packet); + } +} + +/********************************************************************/ +/* Firmware */ +/********************************************************************/ + +#define FW_DL_READY_STATUS (IF_SDIO_IO_RDY | IF_SDIO_DL_RDY) + +static int if_sdio_prog_helper(struct if_sdio_card *card, + const struct firmware *fw) +{ + int ret; + unsigned long timeout; + u8 *chunk_buffer; + u32 chunk_size; + const u8 *firmware; + size_t size; + + chunk_buffer = kzalloc(64, GFP_KERNEL); + if (!chunk_buffer) { + ret = -ENOMEM; + goto out; + } + + sdio_claim_host(card->func); + + ret = sdio_set_block_size(card->func, 32); + if (ret) + goto release; + + firmware = fw->data; + size = fw->size; + + while (size) { + ret = if_sdio_wait_status(card, FW_DL_READY_STATUS); + if (ret) + goto release; + + /* On some platforms (like Davinci) the chip needs more time + * between helper blocks. + */ + mdelay(2); + + chunk_size = min_t(size_t, size, 60); + + *((__le32*)chunk_buffer) = cpu_to_le32(chunk_size); + memcpy(chunk_buffer + 4, firmware, chunk_size); +/* + lbs_deb_sdio("sending %d bytes chunk\n", chunk_size); +*/ + ret = sdio_writesb(card->func, card->ioport, + chunk_buffer, 64); + if (ret) + goto release; + + firmware += chunk_size; + size -= chunk_size; + } + + /* an empty block marks the end of the transfer */ + memset(chunk_buffer, 0, 4); + ret = sdio_writesb(card->func, card->ioport, chunk_buffer, 64); + if (ret) + goto release; + + lbs_deb_sdio("waiting for helper to boot...\n"); + + /* wait for the helper to boot by looking at the size register */ + timeout = jiffies + HZ; + while (1) { + u16 req_size; + + req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, &ret); + if (ret) + goto release; + + req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, &ret) << 8; + if (ret) + goto release; + + if (req_size != 0) + break; + + if (time_after(jiffies, timeout)) { + ret = -ETIMEDOUT; + goto release; + } + + msleep(10); + } + + ret = 0; + +release: + sdio_release_host(card->func); + kfree(chunk_buffer); + +out: + if (ret) + pr_err("failed to load helper firmware\n"); + + return ret; +} + +static int if_sdio_prog_real(struct if_sdio_card *card, + const struct firmware *fw) +{ + int ret; + unsigned long timeout; + u8 *chunk_buffer; + u32 chunk_size; + const u8 *firmware; + size_t size, req_size; + + chunk_buffer = kzalloc(512, GFP_KERNEL); + if (!chunk_buffer) { + ret = -ENOMEM; + goto out; + } + + sdio_claim_host(card->func); + + ret = sdio_set_block_size(card->func, 32); + if (ret) + goto release; + + firmware = fw->data; + size = fw->size; + + while (size) { + timeout = jiffies + HZ; + while (1) { + ret = if_sdio_wait_status(card, FW_DL_READY_STATUS); + if (ret) + goto release; + + req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, + &ret); + if (ret) + goto release; + + req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, + &ret) << 8; + if (ret) + goto release; + + /* + * For SD8688 wait until the length is not 0, 1 or 2 + * before downloading the first FW block, + * since BOOT code writes the register to indicate the + * helper/FW download winner, + * the value could be 1 or 2 (Func1 or Func2). + */ + if ((size != fw->size) || (req_size > 2)) + break; + if (time_after(jiffies, timeout)) { + ret = -ETIMEDOUT; + goto release; + } + mdelay(1); + } + +/* + lbs_deb_sdio("firmware wants %d bytes\n", (int)req_size); +*/ + if (req_size == 0) { + lbs_deb_sdio("firmware helper gave up early\n"); + ret = -EIO; + goto release; + } + + if (req_size & 0x01) { + lbs_deb_sdio("firmware helper signalled error\n"); + ret = -EIO; + goto release; + } + + if (req_size > size) + req_size = size; + + while (req_size) { + chunk_size = min_t(size_t, req_size, 512); + + memcpy(chunk_buffer, firmware, chunk_size); +/* + lbs_deb_sdio("sending %d bytes (%d bytes) chunk\n", + chunk_size, (chunk_size + 31) / 32 * 32); +*/ + ret = sdio_writesb(card->func, card->ioport, + chunk_buffer, roundup(chunk_size, 32)); + if (ret) + goto release; + + firmware += chunk_size; + size -= chunk_size; + req_size -= chunk_size; + } + } + + ret = 0; + + lbs_deb_sdio("waiting for firmware to boot...\n"); + + /* wait for the firmware to boot */ + timeout = jiffies + HZ; + while (1) { + u16 scratch; + + scratch = if_sdio_read_scratch(card, &ret); + if (ret) + goto release; + + if (scratch == IF_SDIO_FIRMWARE_OK) + break; + + if (time_after(jiffies, timeout)) { + ret = -ETIMEDOUT; + goto release; + } + + msleep(10); + } + + ret = 0; + +release: + sdio_release_host(card->func); + kfree(chunk_buffer); + +out: + if (ret) + pr_err("failed to load firmware\n"); + + return ret; +} + +static void if_sdio_do_prog_firmware(struct lbs_private *priv, int ret, + const struct firmware *helper, + const struct firmware *mainfw) +{ + struct if_sdio_card *card = priv->card; + + if (ret) { + pr_err("failed to find firmware (%d)\n", ret); + return; + } + + ret = if_sdio_prog_helper(card, helper); + if (ret) + return; + + lbs_deb_sdio("Helper firmware loaded\n"); + + ret = if_sdio_prog_real(card, mainfw); + if (ret) + return; + + lbs_deb_sdio("Firmware loaded\n"); + if_sdio_finish_power_on(card); +} + +static int if_sdio_prog_firmware(struct if_sdio_card *card) +{ + int ret; + u16 scratch; + + /* + * Disable interrupts + */ + sdio_claim_host(card->func); + sdio_writeb(card->func, 0x00, IF_SDIO_H_INT_MASK, &ret); + sdio_release_host(card->func); + + sdio_claim_host(card->func); + scratch = if_sdio_read_scratch(card, &ret); + sdio_release_host(card->func); + + lbs_deb_sdio("firmware status = %#x\n", scratch); + lbs_deb_sdio("scratch ret = %d\n", ret); + + if (ret) + goto out; + + + /* + * The manual clearly describes that FEDC is the right code to use + * to detect firmware presence, but for SD8686 it is not that simple. + * Scratch is also used to store the RX packet length, so we lose + * the FEDC value early on. So we use a non-zero check in order + * to validate firmware presence. + * Additionally, the SD8686 in the Gumstix always has the high scratch + * bit set, even when the firmware is not loaded. So we have to + * exclude that from the test. + */ + if (scratch == IF_SDIO_FIRMWARE_OK) { + lbs_deb_sdio("firmware already loaded\n"); + if_sdio_finish_power_on(card); + return 0; + } else if ((card->model == MODEL_8686) && (scratch & 0x7fff)) { + lbs_deb_sdio("firmware may be running\n"); + if_sdio_finish_power_on(card); + return 0; + } + + ret = lbs_get_firmware_async(card->priv, &card->func->dev, card->model, + fw_table, if_sdio_do_prog_firmware); + +out: + return ret; +} + +/********************************************************************/ +/* Power management */ +/********************************************************************/ + +/* Finish power on sequence (after firmware is loaded) */ +static void if_sdio_finish_power_on(struct if_sdio_card *card) +{ + struct sdio_func *func = card->func; + struct lbs_private *priv = card->priv; + int ret; + + sdio_claim_host(func); + sdio_set_block_size(card->func, IF_SDIO_BLOCK_SIZE); + + /* + * Get rx_unit if the chip is SD8688 or newer. + * SD8385 & SD8686 do not have rx_unit. + */ + if ((card->model != MODEL_8385) + && (card->model != MODEL_8686)) + card->rx_unit = if_sdio_read_rx_unit(card); + else + card->rx_unit = 0; + + /* + * Set up the interrupt handler late. + * + * If we set it up earlier, the (buggy) hardware generates a spurious + * interrupt, even before the interrupt has been enabled, with + * CCCR_INTx = 0. + * + * We register the interrupt handler late so that we can handle any + * spurious interrupts, and also to avoid generation of that known + * spurious interrupt in the first place. + */ + ret = sdio_claim_irq(func, if_sdio_interrupt); + if (ret) + goto release; + + /* + * Enable interrupts now that everything is set up + */ + sdio_writeb(func, 0x0f, IF_SDIO_H_INT_MASK, &ret); + if (ret) + goto release_irq; + + sdio_release_host(func); + + /* Set fw_ready before queuing any commands so that + * lbs_thread won't block from sending them to firmware. + */ + priv->fw_ready = 1; + + /* + * FUNC_INIT is required for SD8688 WLAN/BT multiple functions + */ + if (card->model == MODEL_8688) { + struct cmd_header cmd; + + memset(&cmd, 0, sizeof(cmd)); + + lbs_deb_sdio("send function INIT command\n"); + if (__lbs_cmd(priv, CMD_FUNC_INIT, &cmd, sizeof(cmd), + lbs_cmd_copyback, (unsigned long) &cmd)) + netdev_alert(priv->dev, "CMD_FUNC_INIT cmd failed\n"); + } + + wake_up(&card->pwron_waitq); + + if (!card->started) { + ret = lbs_start_card(priv); + if_sdio_power_off(card); + if (ret == 0) { + card->started = true; + /* Tell PM core that we don't need the card to be + * powered now */ + pm_runtime_put(&func->dev); + } + } + + return; + +release_irq: + sdio_release_irq(func); +release: + sdio_release_host(func); +} + +static int if_sdio_power_on(struct if_sdio_card *card) +{ + struct sdio_func *func = card->func; + struct mmc_host *host = func->card->host; + int ret; + + sdio_claim_host(func); + + ret = sdio_enable_func(func); + if (ret) + goto release; + + /* For 1-bit transfers to the 8686 model, we need to enable the + * interrupt flag in the CCCR register. Set the MMC_QUIRK_LENIENT_FN0 + * bit to allow access to non-vendor registers. */ + if ((card->model == MODEL_8686) && + (host->caps & MMC_CAP_SDIO_IRQ) && + (host->ios.bus_width == MMC_BUS_WIDTH_1)) { + u8 reg; + + func->card->quirks |= MMC_QUIRK_LENIENT_FN0; + reg = sdio_f0_readb(func, SDIO_CCCR_IF, &ret); + if (ret) + goto disable; + + reg |= SDIO_BUS_ECSI; + sdio_f0_writeb(func, reg, SDIO_CCCR_IF, &ret); + if (ret) + goto disable; + } + + card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret); + if (ret) + goto disable; + + card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 1, &ret) << 8; + if (ret) + goto disable; + + card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 2, &ret) << 16; + if (ret) + goto disable; + + sdio_release_host(func); + ret = if_sdio_prog_firmware(card); + if (ret) { + sdio_claim_host(func); + goto disable; + } + + return 0; + +disable: + sdio_disable_func(func); +release: + sdio_release_host(func); + return ret; +} + +static int if_sdio_power_off(struct if_sdio_card *card) +{ + struct sdio_func *func = card->func; + struct lbs_private *priv = card->priv; + + priv->fw_ready = 0; + + sdio_claim_host(func); + sdio_release_irq(func); + sdio_disable_func(func); + sdio_release_host(func); + return 0; +} + + +/*******************************************************************/ +/* Libertas callbacks */ +/*******************************************************************/ + +static int if_sdio_host_to_card(struct lbs_private *priv, + u8 type, u8 *buf, u16 nb) +{ + int ret; + struct if_sdio_card *card; + struct if_sdio_packet *packet, *cur; + u16 size; + unsigned long flags; + + card = priv->card; + + if (nb > (65536 - sizeof(struct if_sdio_packet) - 4)) { + ret = -EINVAL; + goto out; + } + + /* + * The transfer must be in one transaction or the firmware + * goes suicidal. There's no way to guarantee that for all + * controllers, but we can at least try. + */ + size = sdio_align_size(card->func, nb + 4); + + packet = kzalloc(sizeof(struct if_sdio_packet) + size, + GFP_ATOMIC); + if (!packet) { + ret = -ENOMEM; + goto out; + } + + packet->next = NULL; + packet->nb = size; + + /* + * SDIO specific header. + */ + packet->buffer[0] = (nb + 4) & 0xff; + packet->buffer[1] = ((nb + 4) >> 8) & 0xff; + packet->buffer[2] = type; + packet->buffer[3] = 0; + + memcpy(packet->buffer + 4, buf, nb); + + spin_lock_irqsave(&card->lock, flags); + + if (!card->packets) + card->packets = packet; + else { + cur = card->packets; + while (cur->next) + cur = cur->next; + cur->next = packet; + } + + switch (type) { + case MVMS_CMD: + priv->dnld_sent = DNLD_CMD_SENT; + break; + case MVMS_DAT: + priv->dnld_sent = DNLD_DATA_SENT; + break; + default: + lbs_deb_sdio("unknown packet type %d\n", (int)type); + } + + spin_unlock_irqrestore(&card->lock, flags); + + queue_work(card->workqueue, &card->packet_worker); + + ret = 0; + +out: + return ret; +} + +static int if_sdio_enter_deep_sleep(struct lbs_private *priv) +{ + int ret; + struct cmd_header cmd; + + memset(&cmd, 0, sizeof(cmd)); + + lbs_deb_sdio("send DEEP_SLEEP command\n"); + ret = __lbs_cmd(priv, CMD_802_11_DEEP_SLEEP, &cmd, sizeof(cmd), + lbs_cmd_copyback, (unsigned long) &cmd); + if (ret) + netdev_err(priv->dev, "DEEP_SLEEP cmd failed\n"); + + mdelay(200); + return ret; +} + +static int if_sdio_exit_deep_sleep(struct lbs_private *priv) +{ + struct if_sdio_card *card = priv->card; + int ret = -1; + + sdio_claim_host(card->func); + + sdio_writeb(card->func, HOST_POWER_UP, CONFIGURATION_REG, &ret); + if (ret) + netdev_err(priv->dev, "sdio_writeb failed!\n"); + + sdio_release_host(card->func); + + return ret; +} + +static int if_sdio_reset_deep_sleep_wakeup(struct lbs_private *priv) +{ + struct if_sdio_card *card = priv->card; + int ret = -1; + + sdio_claim_host(card->func); + + sdio_writeb(card->func, 0, CONFIGURATION_REG, &ret); + if (ret) + netdev_err(priv->dev, "sdio_writeb failed!\n"); + + sdio_release_host(card->func); + + return ret; + +} + +static struct mmc_host *reset_host; + +static void if_sdio_reset_card_worker(struct work_struct *work) +{ + /* + * The actual reset operation must be run outside of lbs_thread. This + * is because mmc_remove_host() will cause the device to be instantly + * destroyed, and the libertas driver then needs to end lbs_thread, + * leading to a deadlock. + * + * We run it in a workqueue totally independent from the if_sdio_card + * instance for that reason. + */ + + pr_info("Resetting card..."); + mmc_remove_host(reset_host); + mmc_add_host(reset_host); +} +static DECLARE_WORK(card_reset_work, if_sdio_reset_card_worker); + +static void if_sdio_reset_card(struct lbs_private *priv) +{ + struct if_sdio_card *card = priv->card; + + if (work_pending(&card_reset_work)) + return; + + reset_host = card->func->card->host; + schedule_work(&card_reset_work); +} + +static int if_sdio_power_save(struct lbs_private *priv) +{ + struct if_sdio_card *card = priv->card; + int ret; + + flush_workqueue(card->workqueue); + + ret = if_sdio_power_off(card); + + /* Let runtime PM know the card is powered off */ + pm_runtime_put_sync(&card->func->dev); + + return ret; +} + +static int if_sdio_power_restore(struct lbs_private *priv) +{ + struct if_sdio_card *card = priv->card; + int r; + + /* Make sure the card will not be powered off by runtime PM */ + pm_runtime_get_sync(&card->func->dev); + + r = if_sdio_power_on(card); + if (r) + return r; + + wait_event(card->pwron_waitq, priv->fw_ready); + return 0; +} + + +/*******************************************************************/ +/* SDIO callbacks */ +/*******************************************************************/ + +static void if_sdio_interrupt(struct sdio_func *func) +{ + int ret; + struct if_sdio_card *card; + u8 cause; + + card = sdio_get_drvdata(func); + + cause = sdio_readb(card->func, IF_SDIO_H_INT_STATUS, &ret); + if (ret || !cause) + return; + + lbs_deb_sdio("interrupt: 0x%X\n", (unsigned)cause); + + sdio_writeb(card->func, ~cause, IF_SDIO_H_INT_STATUS, &ret); + if (ret) + return; + + /* + * Ignore the define name, this really means the card has + * successfully received the command. + */ + card->priv->is_activity_detected = 1; + if (cause & IF_SDIO_H_INT_DNLD) + lbs_host_to_card_done(card->priv); + + + if (cause & IF_SDIO_H_INT_UPLD) { + ret = if_sdio_card_to_host(card); + if (ret) + return; + } +} + +static int if_sdio_probe(struct sdio_func *func, + const struct sdio_device_id *id) +{ + struct if_sdio_card *card; + struct lbs_private *priv; + int ret, i; + unsigned int model; + struct if_sdio_packet *packet; + + for (i = 0;i < func->card->num_info;i++) { + if (sscanf(func->card->info[i], + "802.11 SDIO ID: %x", &model) == 1) + break; + if (sscanf(func->card->info[i], + "ID: %x", &model) == 1) + break; + if (!strcmp(func->card->info[i], "IBIS Wireless SDIO Card")) { + model = MODEL_8385; + break; + } + } + + if (i == func->card->num_info) { + pr_err("unable to identify card model\n"); + return -ENODEV; + } + + card = kzalloc(sizeof(struct if_sdio_card), GFP_KERNEL); + if (!card) + return -ENOMEM; + + card->func = func; + card->model = model; + + switch (card->model) { + case MODEL_8385: + card->scratch_reg = IF_SDIO_SCRATCH_OLD; + break; + case MODEL_8686: + card->scratch_reg = IF_SDIO_SCRATCH; + break; + case MODEL_8688: + default: /* for newer chipsets */ + card->scratch_reg = IF_SDIO_FW_STATUS; + break; + } + + spin_lock_init(&card->lock); + card->workqueue = alloc_workqueue("libertas_sdio", WQ_MEM_RECLAIM, 0); + if (unlikely(!card->workqueue)) { + ret = -ENOMEM; + goto err_queue; + } + INIT_WORK(&card->packet_worker, if_sdio_host_to_card_worker); + init_waitqueue_head(&card->pwron_waitq); + + /* Check if we support this card */ + for (i = 0; i < ARRAY_SIZE(fw_table); i++) { + if (card->model == fw_table[i].model) + break; + } + if (i == ARRAY_SIZE(fw_table)) { + pr_err("unknown card model 0x%x\n", card->model); + ret = -ENODEV; + goto free; + } + + sdio_set_drvdata(func, card); + + lbs_deb_sdio("class = 0x%X, vendor = 0x%X, " + "device = 0x%X, model = 0x%X, ioport = 0x%X\n", + func->class, func->vendor, func->device, + model, (unsigned)card->ioport); + + + priv = lbs_add_card(card, &func->dev); + if (IS_ERR(priv)) { + ret = PTR_ERR(priv); + goto free; + } + + card->priv = priv; + + priv->card = card; + priv->hw_host_to_card = if_sdio_host_to_card; + priv->enter_deep_sleep = if_sdio_enter_deep_sleep; + priv->exit_deep_sleep = if_sdio_exit_deep_sleep; + priv->reset_deep_sleep_wakeup = if_sdio_reset_deep_sleep_wakeup; + priv->reset_card = if_sdio_reset_card; + priv->power_save = if_sdio_power_save; + priv->power_restore = if_sdio_power_restore; + priv->is_polling = !(func->card->host->caps & MMC_CAP_SDIO_IRQ); + ret = if_sdio_power_on(card); + if (ret) + goto err_activate_card; + +out: + return ret; + +err_activate_card: + flush_workqueue(card->workqueue); + lbs_remove_card(priv); +free: + destroy_workqueue(card->workqueue); +err_queue: + while (card->packets) { + packet = card->packets; + card->packets = card->packets->next; + kfree(packet); + } + + kfree(card); + + goto out; +} + +static void if_sdio_remove(struct sdio_func *func) +{ + struct if_sdio_card *card; + struct if_sdio_packet *packet; + + card = sdio_get_drvdata(func); + + /* Undo decrement done above in if_sdio_probe */ + pm_runtime_get_noresume(&func->dev); + + if (user_rmmod && (card->model == MODEL_8688)) { + /* + * FUNC_SHUTDOWN is required for SD8688 WLAN/BT + * multiple functions + */ + struct cmd_header cmd; + + memset(&cmd, 0, sizeof(cmd)); + + lbs_deb_sdio("send function SHUTDOWN command\n"); + if (__lbs_cmd(card->priv, CMD_FUNC_SHUTDOWN, + &cmd, sizeof(cmd), lbs_cmd_copyback, + (unsigned long) &cmd)) + pr_alert("CMD_FUNC_SHUTDOWN cmd failed\n"); + } + + + lbs_deb_sdio("call remove card\n"); + lbs_stop_card(card->priv); + lbs_remove_card(card->priv); + + destroy_workqueue(card->workqueue); + + while (card->packets) { + packet = card->packets; + card->packets = card->packets->next; + kfree(packet); + } + + kfree(card); +} + +static int if_sdio_suspend(struct device *dev) +{ + struct sdio_func *func = dev_to_sdio_func(dev); + struct if_sdio_card *card = sdio_get_drvdata(func); + struct lbs_private *priv = card->priv; + int ret; + + mmc_pm_flag_t flags = sdio_get_host_pm_caps(func); + priv->power_up_on_resume = false; + + /* If we're powered off anyway, just let the mmc layer remove the + * card. */ + if (!lbs_iface_active(priv)) { + if (priv->fw_ready) { + priv->power_up_on_resume = true; + if_sdio_power_off(card); + } + + return 0; + } + + dev_info(dev, "%s: suspend: PM flags = 0x%x\n", + sdio_func_id(func), flags); + + /* If we aren't being asked to wake on anything, we should bail out + * and let the SD stack power down the card. + */ + if (priv->wol_criteria == EHS_REMOVE_WAKEUP) { + dev_info(dev, "Suspend without wake params -- powering down card\n"); + if (priv->fw_ready) { + ret = lbs_suspend(priv); + if (ret) + return ret; + + priv->power_up_on_resume = true; + if_sdio_power_off(card); + } + + return 0; + } + + if (!(flags & MMC_PM_KEEP_POWER)) { + dev_err(dev, "%s: cannot remain alive while host is suspended\n", + sdio_func_id(func)); + return -ENOSYS; + } + + ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER); + if (ret) + return ret; + + ret = lbs_suspend(priv); + if (ret) + return ret; + + return sdio_set_host_pm_flags(func, MMC_PM_WAKE_SDIO_IRQ); +} + +static int if_sdio_resume(struct device *dev) +{ + struct sdio_func *func = dev_to_sdio_func(dev); + struct if_sdio_card *card = sdio_get_drvdata(func); + int ret; + + dev_info(dev, "%s: resume: we're back\n", sdio_func_id(func)); + + if (card->priv->power_up_on_resume) { + if_sdio_power_on(card); + wait_event(card->pwron_waitq, card->priv->fw_ready); + } + + ret = lbs_resume(card->priv); + + return ret; +} + +static const struct dev_pm_ops if_sdio_pm_ops = { + .suspend = if_sdio_suspend, + .resume = if_sdio_resume, +}; + +static struct sdio_driver if_sdio_driver = { + .name = "libertas_sdio", + .id_table = if_sdio_ids, + .probe = if_sdio_probe, + .remove = if_sdio_remove, + .drv = { + .pm = &if_sdio_pm_ops, + }, +}; + +/*******************************************************************/ +/* Module functions */ +/*******************************************************************/ + +static int __init if_sdio_init_module(void) +{ + int ret = 0; + + printk(KERN_INFO "libertas_sdio: Libertas SDIO driver\n"); + printk(KERN_INFO "libertas_sdio: Copyright Pierre Ossman\n"); + + ret = sdio_register_driver(&if_sdio_driver); + + /* Clear the flag in case user removes the card. */ + user_rmmod = 0; + + return ret; +} + +static void __exit if_sdio_exit_module(void) +{ + /* Set the flag as user is removing this module. */ + user_rmmod = 1; + + cancel_work_sync(&card_reset_work); + + sdio_unregister_driver(&if_sdio_driver); +} + +module_init(if_sdio_init_module); +module_exit(if_sdio_exit_module); + +MODULE_DESCRIPTION("Libertas SDIO WLAN Driver"); +MODULE_AUTHOR("Pierre Ossman"); +MODULE_LICENSE("GPL"); |