--- /dev/null
+// 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;
+
+ if (!host->mmc->parent->platform_data) {
+ dev_err(mmc_dev(host->mmc), "no platform data!\n");
+ return -EINVAL;
+ }
+
+ plat_data = (struct mcf_esdhc_platform_data *)
+ host->mmc->parent->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 int 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);
+
+ return 0;
+}
+
+static struct platform_driver sdhci_esdhc_mcf_driver = {
+ .driver = {
+ .name = "sdhci-esdhc-mcf",
+ },
+ .probe = sdhci_esdhc_mcf_probe,
+ .remove = 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");
projects / kernel.git / commitdiff