drivers: imx: mxc_usdhc: Add USDHC driver to support boot EMMC
Add USDHC driver to support boot EMMC. Only initialization
and single/multiple block read are tested.
[bod: fixed checkpatch.pl complaints]
[bod: changed name to imx_usdhc for namespace consistency]
[bod: squashed antecedent fixes into this one patch]
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
diff --git a/drivers/imx/usdhc/imx_usdhc.c b/drivers/imx/usdhc/imx_usdhc.c
new file mode 100644
index 0000000..ea96833
--- /dev/null
+++ b/drivers/imx/usdhc/imx_usdhc.c
@@ -0,0 +1,300 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <assert.h>
+#include <debug.h>
+#include <delay_timer.h>
+#include <imx_usdhc.h>
+#include <mmc.h>
+#include <errno.h>
+#include <mmio.h>
+#include <string.h>
+
+static void imx_usdhc_initialize(void);
+static int imx_usdhc_send_cmd(struct mmc_cmd *cmd);
+static int imx_usdhc_set_ios(unsigned int clk, unsigned int width);
+static int imx_usdhc_prepare(int lba, uintptr_t buf, size_t size);
+static int imx_usdhc_read(int lba, uintptr_t buf, size_t size);
+static int imx_usdhc_write(int lba, uintptr_t buf, size_t size);
+
+static const struct mmc_ops imx_usdhc_ops = {
+ .init = imx_usdhc_initialize,
+ .send_cmd = imx_usdhc_send_cmd,
+ .set_ios = imx_usdhc_set_ios,
+ .prepare = imx_usdhc_prepare,
+ .read = imx_usdhc_read,
+ .write = imx_usdhc_write,
+};
+
+static imx_usdhc_params_t imx_usdhc_params;
+
+#define IMX7_MMC_SRC_CLK_RATE (200 * 1000 * 1000)
+static void imx_usdhc_set_clk(int clk)
+{
+ int div = 1;
+ int pre_div = 1;
+ unsigned int sdhc_clk = IMX7_MMC_SRC_CLK_RATE;
+ uintptr_t reg_base = imx_usdhc_params.reg_base;
+
+ assert(clk > 0);
+
+ while (sdhc_clk / (16 * pre_div) > clk && pre_div < 256)
+ pre_div *= 2;
+
+ while (sdhc_clk / div > clk && div < 16)
+ div++;
+
+ pre_div >>= 1;
+ div -= 1;
+ clk = (pre_div << 8) | (div << 4);
+
+ mmio_clrbits32(reg_base + VENDSPEC, VENDSPEC_CARD_CLKEN);
+ mmio_clrsetbits32(reg_base + SYSCTRL, SYSCTRL_CLOCK_MASK, clk);
+ udelay(10000);
+
+ mmio_setbits32(reg_base + VENDSPEC, VENDSPEC_PER_CLKEN | VENDSPEC_CARD_CLKEN);
+}
+
+static void imx_usdhc_initialize(void)
+{
+ unsigned int timeout = 10000;
+ uintptr_t reg_base = imx_usdhc_params.reg_base;
+
+ assert((imx_usdhc_params.reg_base & MMC_BLOCK_MASK) == 0);
+
+ /* reset the controller */
+ mmio_setbits32(reg_base + SYSCTRL, SYSCTRL_RSTA);
+
+ /* wait for reset done */
+ while ((mmio_read_32(reg_base + SYSCTRL) & SYSCTRL_RSTA)) {
+ if (!timeout)
+ ERROR("IMX MMC reset timeout.\n");
+ timeout--;
+ }
+
+ mmio_write_32(reg_base + MMCBOOT, 0);
+ mmio_write_32(reg_base + MIXCTRL, 0);
+ mmio_write_32(reg_base + CLKTUNECTRLSTS, 0);
+
+ mmio_write_32(reg_base + VENDSPEC, VENDSPEC_INIT);
+ mmio_write_32(reg_base + DLLCTRL, 0);
+ mmio_setbits32(reg_base + VENDSPEC, VENDSPEC_IPG_CLKEN | VENDSPEC_PER_CLKEN);
+
+ /* Set the initial boot clock rate */
+ imx_usdhc_set_clk(MMC_BOOT_CLK_RATE);
+ udelay(100);
+
+ /* Clear read/write ready status */
+ mmio_clrbits32(reg_base + INTSTATEN, INTSTATEN_BRR | INTSTATEN_BWR);
+
+ /* configure as little endian */
+ mmio_write_32(reg_base + PROTCTRL, PROTCTRL_LE);
+
+ /* Set timeout to the maximum value */
+ mmio_clrsetbits32(reg_base + SYSCTRL, SYSCTRL_TIMEOUT_MASK,
+ SYSCTRL_TIMEOUT(15));
+
+ /* set wartermark level as 16 for safe for MMC */
+ mmio_clrsetbits32(reg_base + WATERMARKLEV, WMKLV_MASK, 16 | (16 << 16));
+}
+
+#define FSL_CMD_RETRIES 1000
+
+static int imx_usdhc_send_cmd(struct mmc_cmd *cmd)
+{
+ uintptr_t reg_base = imx_usdhc_params.reg_base;
+ unsigned int xfertype = 0, mixctl = 0, multiple = 0, data = 0, err = 0;
+ unsigned int state, flags = INTSTATEN_CC | INTSTATEN_CTOE;
+ unsigned int cmd_retries = 0;
+
+ assert(cmd);
+
+ /* clear all irq status */
+ mmio_write_32(reg_base + INTSTAT, 0xffffffff);
+
+ /* Wait for the bus to be idle */
+ do {
+ state = mmio_read_32(reg_base + PSTATE);
+ } while (state & (PSTATE_CDIHB | PSTATE_CIHB));
+
+ while (mmio_read_32(reg_base + PSTATE) & PSTATE_DLA)
+ ;
+
+ mmio_write_32(reg_base + INTSIGEN, 0);
+ udelay(1000);
+
+ switch (cmd->cmd_idx) {
+ case MMC_CMD(12):
+ xfertype |= XFERTYPE_CMDTYP_ABORT;
+ break;
+ case MMC_CMD(18):
+ multiple = 1;
+ /* fall thru for read op */
+ case MMC_CMD(17):
+ case MMC_CMD(8):
+ mixctl |= MIXCTRL_DTDSEL;
+ data = 1;
+ break;
+ case MMC_CMD(25):
+ multiple = 1;
+ /* fall thru for data op flag */
+ case MMC_CMD(24):
+ data = 1;
+ break;
+ default:
+ break;
+ }
+
+ if (multiple) {
+ mixctl |= MIXCTRL_MSBSEL;
+ mixctl |= MIXCTRL_BCEN;
+ }
+
+ if (data) {
+ xfertype |= XFERTYPE_DPSEL;
+ mixctl |= MIXCTRL_DMAEN;
+ }
+
+ if (cmd->resp_type & MMC_RSP_48)
+ xfertype |= XFERTYPE_RSPTYP_48;
+ else if (cmd->resp_type & MMC_RSP_136)
+ xfertype |= XFERTYPE_RSPTYP_136;
+ else if (cmd->resp_type & MMC_RSP_BUSY)
+ xfertype |= XFERTYPE_RSPTYP_48_BUSY;
+
+ if (cmd->resp_type & MMC_RSP_CMD_IDX)
+ xfertype |= XFERTYPE_CICEN;
+
+ if (cmd->resp_type & MMC_RSP_CRC)
+ xfertype |= XFERTYPE_CCCEN;
+
+ xfertype |= XFERTYPE_CMD(cmd->cmd_idx);
+
+ /* Send the command */
+ mmio_write_32(reg_base + CMDARG, cmd->cmd_arg);
+ mmio_clrsetbits32(reg_base + MIXCTRL, MIXCTRL_DATMASK, mixctl);
+ mmio_write_32(reg_base + XFERTYPE, xfertype);
+
+ /* Wait for the command done */
+ do {
+ state = mmio_read_32(reg_base + INTSTAT);
+ if (cmd_retries)
+ udelay(1);
+ } while ((!(state & flags)) && ++cmd_retries < FSL_CMD_RETRIES);
+
+ if ((state & (INTSTATEN_CTOE | CMD_ERR)) || cmd_retries == FSL_CMD_RETRIES) {
+ if (cmd_retries == FSL_CMD_RETRIES)
+ err = -ETIMEDOUT;
+ else
+ err = -EIO;
+ ERROR("imx_usdhc mmc cmd %d state 0x%x errno=%d\n",
+ cmd->cmd_idx, state, err);
+ goto out;
+ }
+
+ /* Copy the response to the response buffer */
+ if (cmd->resp_type & MMC_RSP_136) {
+ unsigned int cmdrsp3, cmdrsp2, cmdrsp1, cmdrsp0;
+
+ cmdrsp3 = mmio_read_32(reg_base + CMDRSP3);
+ cmdrsp2 = mmio_read_32(reg_base + CMDRSP2);
+ cmdrsp1 = mmio_read_32(reg_base + CMDRSP1);
+ cmdrsp0 = mmio_read_32(reg_base + CMDRSP0);
+ cmd->resp_data[3] = (cmdrsp3 << 8) | (cmdrsp2 >> 24);
+ cmd->resp_data[2] = (cmdrsp2 << 8) | (cmdrsp1 >> 24);
+ cmd->resp_data[1] = (cmdrsp1 << 8) | (cmdrsp0 >> 24);
+ cmd->resp_data[0] = (cmdrsp0 << 8);
+ } else {
+ cmd->resp_data[0] = mmio_read_32(reg_base + CMDRSP0);
+ }
+
+ /* Wait until all of the blocks are transferred */
+ if (data) {
+ flags = DATA_COMPLETE;
+ do {
+ state = mmio_read_32(reg_base + INTSTAT);
+
+ if (state & (INTSTATEN_DTOE | DATA_ERR)) {
+ err = -EIO;
+ ERROR("imx_usdhc mmc data state 0x%x\n", state);
+ goto out;
+ }
+ } while ((state & flags) != flags);
+ }
+
+out:
+ /* Reset CMD and DATA on error */
+ if (err) {
+ mmio_setbits32(reg_base + SYSCTRL, SYSCTRL_RSTC);
+ while (mmio_read_32(reg_base + SYSCTRL) & SYSCTRL_RSTC)
+ ;
+
+ if (data) {
+ mmio_setbits32(reg_base + SYSCTRL, SYSCTRL_RSTD);
+ while (mmio_read_32(reg_base + SYSCTRL) & SYSCTRL_RSTD)
+ ;
+ }
+ }
+
+ /* clear all irq status */
+ mmio_write_32(reg_base + INTSTAT, 0xffffffff);
+
+ return err;
+}
+
+static int imx_usdhc_set_ios(unsigned int clk, unsigned int width)
+{
+ uintptr_t reg_base = imx_usdhc_params.reg_base;
+
+ imx_usdhc_set_clk(clk);
+
+ if (width == MMC_BUS_WIDTH_4)
+ mmio_clrsetbits32(reg_base + PROTCTRL, PROTCTRL_WIDTH_MASK,
+ PROTCTRL_WIDTH_4);
+ else if (width == MMC_BUS_WIDTH_8)
+ mmio_clrsetbits32(reg_base + PROTCTRL, PROTCTRL_WIDTH_MASK,
+ PROTCTRL_WIDTH_8);
+
+ return 0;
+}
+
+static int imx_usdhc_prepare(int lba, uintptr_t buf, size_t size)
+{
+ uintptr_t reg_base = imx_usdhc_params.reg_base;
+
+ mmio_write_32(reg_base + DSADDR, buf);
+ mmio_write_32(reg_base + BLKATT,
+ (size / MMC_BLOCK_SIZE) << 16 | MMC_BLOCK_SIZE);
+
+ return 0;
+}
+
+static int imx_usdhc_read(int lba, uintptr_t buf, size_t size)
+{
+ return 0;
+}
+
+static int imx_usdhc_write(int lba, uintptr_t buf, size_t size)
+{
+ return 0;
+}
+
+void imx_usdhc_init(imx_usdhc_params_t *params,
+ struct mmc_device_info *mmc_dev_info)
+{
+ assert((params != 0) &&
+ ((params->reg_base & MMC_BLOCK_MASK) == 0) &&
+ (params->clk_rate > 0) &&
+ ((params->bus_width == MMC_BUS_WIDTH_1) ||
+ (params->bus_width == MMC_BUS_WIDTH_4) ||
+ (params->bus_width == MMC_BUS_WIDTH_8)));
+
+ memcpy(&imx_usdhc_params, params, sizeof(imx_usdhc_params_t));
+ mmc_init(&imx_usdhc_ops, params->clk_rate, params->bus_width,
+ params->flags, mmc_dev_info);
+}