diff options
Diffstat (limited to 'drivers/mmc/host/sdhci-esdhc-mcf.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-esdhc-mcf.c | 520 |
1 files changed, 520 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-esdhc-mcf.c b/drivers/mmc/host/sdhci-esdhc-mcf.c new file mode 100644 index 0000000000..a07f8333cd --- /dev/null +++ b/drivers/mmc/host/sdhci-esdhc-mcf.c @@ -0,0 +1,520 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Freescale eSDHC ColdFire family controller driver, platform bus. + * + * Copyright (c) 2020 Timesys Corporation + * Author: Angelo Dureghello <angelo.dureghello@timesys.it> + */ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/platform_data/mmc-esdhc-mcf.h> +#include <linux/mmc/mmc.h> +#include "sdhci-pltfm.h" +#include "sdhci-esdhc.h" + +#define ESDHC_PROCTL_D3CD 0x08 +#define ESDHC_SYS_CTRL_DTOCV_MASK 0x0f +#define ESDHC_DEFAULT_HOST_CONTROL 0x28 + +/* + * Freescale eSDHC has DMA ERR flag at bit 28, not as std spec says, bit 25. + */ +#define ESDHC_INT_VENDOR_SPEC_DMA_ERR BIT(28) + +struct pltfm_mcf_data { + struct clk *clk_ipg; + struct clk *clk_ahb; + struct clk *clk_per; + int aside; + int current_bus_width; +}; + +static inline void esdhc_mcf_buffer_swap32(u32 *buf, int len) +{ + int i; + u32 temp; + + len = (len + 3) >> 2; + + for (i = 0; i < len; i++) { + temp = swab32(*buf); + *buf++ = temp; + } +} + +static inline void esdhc_clrset_be(struct sdhci_host *host, + u32 mask, u32 val, int reg) +{ + void __iomem *base = host->ioaddr + (reg & ~3); + u8 shift = (reg & 3) << 3; + + mask <<= shift; + val <<= shift; + + if (reg == SDHCI_HOST_CONTROL) + val |= ESDHC_PROCTL_D3CD; + + writel((readl(base) & ~mask) | val, base); +} + +/* + * Note: mcf is big-endian, single bytes need to be accessed at big endian + * offsets. + */ +static void esdhc_mcf_writeb_be(struct sdhci_host *host, u8 val, int reg) +{ + void __iomem *base = host->ioaddr + (reg & ~3); + u8 shift = (reg & 3) << 3; + u32 mask = ~(0xff << shift); + + if (reg == SDHCI_HOST_CONTROL) { + u32 host_ctrl = ESDHC_DEFAULT_HOST_CONTROL; + u8 dma_bits = (val & SDHCI_CTRL_DMA_MASK) >> 3; + u8 tmp = readb(host->ioaddr + SDHCI_HOST_CONTROL + 1); + + tmp &= ~0x03; + tmp |= dma_bits; + + /* + * Recomposition needed, restore always endianness and + * keep D3CD and AI, just setting bus width. + */ + host_ctrl |= val; + host_ctrl |= (dma_bits << 8); + writel(host_ctrl, host->ioaddr + SDHCI_HOST_CONTROL); + + return; + } + + writel((readl(base) & mask) | (val << shift), base); +} + +static void esdhc_mcf_writew_be(struct sdhci_host *host, u16 val, int reg) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct pltfm_mcf_data *mcf_data = sdhci_pltfm_priv(pltfm_host); + void __iomem *base = host->ioaddr + (reg & ~3); + u8 shift = (reg & 3) << 3; + u32 mask = ~(0xffff << shift); + + switch (reg) { + case SDHCI_TRANSFER_MODE: + mcf_data->aside = val; + return; + case SDHCI_COMMAND: + if (host->cmd->opcode == MMC_STOP_TRANSMISSION) + val |= SDHCI_CMD_ABORTCMD; + + /* + * As for the fsl driver, + * we have to set the mode in a single write here. + */ + writel(val << 16 | mcf_data->aside, + host->ioaddr + SDHCI_TRANSFER_MODE); + return; + } + + writel((readl(base) & mask) | (val << shift), base); +} + +static void esdhc_mcf_writel_be(struct sdhci_host *host, u32 val, int reg) +{ + writel(val, host->ioaddr + reg); +} + +static u8 esdhc_mcf_readb_be(struct sdhci_host *host, int reg) +{ + if (reg == SDHCI_HOST_CONTROL) { + u8 __iomem *base = host->ioaddr + (reg & ~3); + u16 val = readw(base + 2); + u8 dma_bits = (val >> 5) & SDHCI_CTRL_DMA_MASK; + u8 host_ctrl = val & 0xff; + + host_ctrl &= ~SDHCI_CTRL_DMA_MASK; + host_ctrl |= dma_bits; + + return host_ctrl; + } + + return readb(host->ioaddr + (reg ^ 0x3)); +} + +static u16 esdhc_mcf_readw_be(struct sdhci_host *host, int reg) +{ + /* + * For SDHCI_HOST_VERSION, sdhci specs defines 0xFE, + * a wrong offset for us, we are at 0xFC. + */ + if (reg == SDHCI_HOST_VERSION) + reg -= 2; + + return readw(host->ioaddr + (reg ^ 0x2)); +} + +static u32 esdhc_mcf_readl_be(struct sdhci_host *host, int reg) +{ + u32 val; + + val = readl(host->ioaddr + reg); + + /* + * RM (25.3.9) sd pin clock must never exceed 25Mhz. + * So forcing legacy mode at 25Mhz. + */ + if (unlikely(reg == SDHCI_CAPABILITIES)) + val &= ~SDHCI_CAN_DO_HISPD; + + if (unlikely(reg == SDHCI_INT_STATUS)) { + if (val & ESDHC_INT_VENDOR_SPEC_DMA_ERR) { + val &= ~ESDHC_INT_VENDOR_SPEC_DMA_ERR; + val |= SDHCI_INT_ADMA_ERROR; + } + } + + return val; +} + +static unsigned int esdhc_mcf_get_max_timeout_count(struct sdhci_host *host) +{ + return 1 << 27; +} + +static void esdhc_mcf_set_timeout(struct sdhci_host *host, + struct mmc_command *cmd) +{ + /* Use maximum timeout counter */ + esdhc_clrset_be(host, ESDHC_SYS_CTRL_DTOCV_MASK, 0xE, + SDHCI_TIMEOUT_CONTROL); +} + +static void esdhc_mcf_reset(struct sdhci_host *host, u8 mask) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct pltfm_mcf_data *mcf_data = sdhci_pltfm_priv(pltfm_host); + + sdhci_reset(host, mask); + + esdhc_clrset_be(host, ESDHC_CTRL_BUSWIDTH_MASK, + mcf_data->current_bus_width, SDHCI_HOST_CONTROL); + + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); +} + +static unsigned int esdhc_mcf_pltfm_get_max_clock(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + + return pltfm_host->clock; +} + +static unsigned int esdhc_mcf_pltfm_get_min_clock(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + + return pltfm_host->clock / 256 / 16; +} + +static void esdhc_mcf_pltfm_set_clock(struct sdhci_host *host, + unsigned int clock) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + unsigned long *pll_dr = (unsigned long *)MCF_PLL_DR; + u32 fvco, fsys, fesdhc, temp; + const int sdclkfs[] = {2, 4, 8, 16, 32, 64, 128, 256}; + int delta, old_delta = clock; + int i, q, ri, rq; + + if (clock == 0) { + host->mmc->actual_clock = 0; + return; + } + + /* + * ColdFire eSDHC clock.s + * + * pll -+-> / outdiv1 --> fsys + * +-> / outdiv3 --> eSDHC clock ---> / SDCCLKFS / DVS + * + * mcf5441x datasheet says: + * (8.1.2) eSDHC should be 40 MHz max + * (25.3.9) eSDHC input is, as example, 96 Mhz ... + * (25.3.9) sd pin clock must never exceed 25Mhz + * + * fvco = fsys * outdvi1 + 1 + * fshdc = fvco / outdiv3 + 1 + */ + temp = readl(pll_dr); + fsys = pltfm_host->clock; + fvco = fsys * ((temp & 0x1f) + 1); + fesdhc = fvco / (((temp >> 10) & 0x1f) + 1); + + for (i = 0; i < 8; ++i) { + int result = fesdhc / sdclkfs[i]; + + for (q = 1; q < 17; ++q) { + int finale = result / q; + + delta = abs(clock - finale); + + if (delta < old_delta) { + old_delta = delta; + ri = i; + rq = q; + } + } + } + + /* + * Apply divisors and re-enable all the clocks + */ + temp = ((sdclkfs[ri] >> 1) << 8) | ((rq - 1) << 4) | + (ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN); + esdhc_clrset_be(host, 0x0000fff7, temp, SDHCI_CLOCK_CONTROL); + + host->mmc->actual_clock = clock; + + mdelay(1); +} + +static void esdhc_mcf_pltfm_set_bus_width(struct sdhci_host *host, int width) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct pltfm_mcf_data *mcf_data = sdhci_pltfm_priv(pltfm_host); + + switch (width) { + case MMC_BUS_WIDTH_4: + mcf_data->current_bus_width = ESDHC_CTRL_4BITBUS; + break; + default: + mcf_data->current_bus_width = 0; + break; + } + + esdhc_clrset_be(host, ESDHC_CTRL_BUSWIDTH_MASK, + mcf_data->current_bus_width, SDHCI_HOST_CONTROL); +} + +static void esdhc_mcf_request_done(struct sdhci_host *host, + struct mmc_request *mrq) +{ + struct scatterlist *sg; + u32 *buffer; + int i; + + if (!mrq->data || !mrq->data->bytes_xfered) + goto exit_done; + + if (mmc_get_dma_dir(mrq->data) != DMA_FROM_DEVICE) + goto exit_done; + + /* + * On mcf5441x there is no hw sdma option/flag to select the dma + * transfer endiannes. A swap after the transfer is needed. + */ + for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i) { + buffer = (u32 *)sg_virt(sg); + esdhc_mcf_buffer_swap32(buffer, sg->length); + } + +exit_done: + mmc_request_done(host->mmc, mrq); +} + +static void esdhc_mcf_copy_to_bounce_buffer(struct sdhci_host *host, + struct mmc_data *data, + unsigned int length) +{ + sg_copy_to_buffer(data->sg, data->sg_len, + host->bounce_buffer, length); + + esdhc_mcf_buffer_swap32((u32 *)host->bounce_buffer, + data->blksz * data->blocks); +} + +static struct sdhci_ops sdhci_esdhc_ops = { + .reset = esdhc_mcf_reset, + .set_clock = esdhc_mcf_pltfm_set_clock, + .get_max_clock = esdhc_mcf_pltfm_get_max_clock, + .get_min_clock = esdhc_mcf_pltfm_get_min_clock, + .set_bus_width = esdhc_mcf_pltfm_set_bus_width, + .get_max_timeout_count = esdhc_mcf_get_max_timeout_count, + .set_timeout = esdhc_mcf_set_timeout, + .write_b = esdhc_mcf_writeb_be, + .write_w = esdhc_mcf_writew_be, + .write_l = esdhc_mcf_writel_be, + .read_b = esdhc_mcf_readb_be, + .read_w = esdhc_mcf_readw_be, + .read_l = esdhc_mcf_readl_be, + .copy_to_bounce_buffer = esdhc_mcf_copy_to_bounce_buffer, + .request_done = esdhc_mcf_request_done, +}; + +static const struct sdhci_pltfm_data sdhci_esdhc_mcf_pdata = { + .ops = &sdhci_esdhc_ops, + .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_FORCE_DMA, + /* + * Mandatory quirk, + * controller does not support cmd23, + * without, on > 8G cards cmd23 is used, and + * driver times out. + */ + SDHCI_QUIRK2_HOST_NO_CMD23, +}; + +static int esdhc_mcf_plat_init(struct sdhci_host *host, + struct pltfm_mcf_data *mcf_data) +{ + struct mcf_esdhc_platform_data *plat_data; + struct device *dev = mmc_dev(host->mmc); + + if (!dev->platform_data) { + dev_err(dev, "no platform data!\n"); + return -EINVAL; + } + + plat_data = (struct mcf_esdhc_platform_data *)dev->platform_data; + + /* Card_detect */ + switch (plat_data->cd_type) { + default: + case ESDHC_CD_CONTROLLER: + /* We have a working card_detect back */ + host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION; + break; + case ESDHC_CD_PERMANENT: + host->mmc->caps |= MMC_CAP_NONREMOVABLE; + break; + case ESDHC_CD_NONE: + break; + } + + switch (plat_data->max_bus_width) { + case 4: + host->mmc->caps |= MMC_CAP_4_BIT_DATA; + break; + case 1: + default: + host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; + break; + } + + return 0; +} + +static int sdhci_esdhc_mcf_probe(struct platform_device *pdev) +{ + struct sdhci_host *host; + struct sdhci_pltfm_host *pltfm_host; + struct pltfm_mcf_data *mcf_data; + int err; + + host = sdhci_pltfm_init(pdev, &sdhci_esdhc_mcf_pdata, + sizeof(*mcf_data)); + + if (IS_ERR(host)) + return PTR_ERR(host); + + pltfm_host = sdhci_priv(host); + mcf_data = sdhci_pltfm_priv(pltfm_host); + + host->sdma_boundary = 0; + + host->flags |= SDHCI_AUTO_CMD12; + + mcf_data->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); + if (IS_ERR(mcf_data->clk_ipg)) { + err = PTR_ERR(mcf_data->clk_ipg); + goto err_exit; + } + + mcf_data->clk_ahb = devm_clk_get(&pdev->dev, "ahb"); + if (IS_ERR(mcf_data->clk_ahb)) { + err = PTR_ERR(mcf_data->clk_ahb); + goto err_exit; + } + + mcf_data->clk_per = devm_clk_get(&pdev->dev, "per"); + if (IS_ERR(mcf_data->clk_per)) { + err = PTR_ERR(mcf_data->clk_per); + goto err_exit; + } + + pltfm_host->clk = mcf_data->clk_per; + pltfm_host->clock = clk_get_rate(pltfm_host->clk); + err = clk_prepare_enable(mcf_data->clk_per); + if (err) + goto err_exit; + + err = clk_prepare_enable(mcf_data->clk_ipg); + if (err) + goto unprep_per; + + err = clk_prepare_enable(mcf_data->clk_ahb); + if (err) + goto unprep_ipg; + + err = esdhc_mcf_plat_init(host, mcf_data); + if (err) + goto unprep_ahb; + + err = sdhci_setup_host(host); + if (err) + goto unprep_ahb; + + if (!host->bounce_buffer) { + dev_err(&pdev->dev, "bounce buffer not allocated"); + err = -ENOMEM; + goto cleanup; + } + + err = __sdhci_add_host(host); + if (err) + goto cleanup; + + return 0; + +cleanup: + sdhci_cleanup_host(host); +unprep_ahb: + clk_disable_unprepare(mcf_data->clk_ahb); +unprep_ipg: + clk_disable_unprepare(mcf_data->clk_ipg); +unprep_per: + clk_disable_unprepare(mcf_data->clk_per); +err_exit: + sdhci_pltfm_free(pdev); + + return err; +} + +static void sdhci_esdhc_mcf_remove(struct platform_device *pdev) +{ + struct sdhci_host *host = platform_get_drvdata(pdev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct pltfm_mcf_data *mcf_data = sdhci_pltfm_priv(pltfm_host); + + sdhci_remove_host(host, 0); + + clk_disable_unprepare(mcf_data->clk_ipg); + clk_disable_unprepare(mcf_data->clk_ahb); + clk_disable_unprepare(mcf_data->clk_per); + + sdhci_pltfm_free(pdev); +} + +static struct platform_driver sdhci_esdhc_mcf_driver = { + .driver = { + .name = "sdhci-esdhc-mcf", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .probe = sdhci_esdhc_mcf_probe, + .remove_new = sdhci_esdhc_mcf_remove, +}; + +module_platform_driver(sdhci_esdhc_mcf_driver); + +MODULE_DESCRIPTION("SDHCI driver for Freescale ColdFire eSDHC"); +MODULE_AUTHOR("Angelo Dureghello <angelo.dureghello@timesys.com>"); +MODULE_LICENSE("GPL v2"); |