This is a port of Linux driver for SDHC host controller hardware
found on Freescale's MX2 and MX3 processors. Uses new generic MMC
framework (CONFIG_GENERIC_MMC) and it looks like there are some
problems with a framework (at least on LE cpus). Some of these
problems are addressed in the following patches.
Signed-off-by: Ilya Yanok <ya...@emcraft.com>
---
cpu/arm926ejs/mx27/generic.c | 16 ++
drivers/mmc/Makefile | 1 +
drivers/mmc/mxcmmc.c | 520 ++++++++++++++++++++++++++++++++++++
include/asm-arm/arch-mx27/mxcmmc.h | 25 ++
4 files changed, 562 insertions(+), 0 deletions(-)
create mode 100644 drivers/mmc/mxcmmc.c
create mode 100644 include/asm-arm/arch-mx27/mxcmmc.h
diff --git a/cpu/arm926ejs/mx27/generic.c b/cpu/arm926ejs/mx27/generic.c
index fdbc8b7..a0be35b 100644
--- a/cpu/arm926ejs/mx27/generic.c
+++ b/cpu/arm926ejs/mx27/generic.c
@@ -21,6 +21,9 @@
#include <common.h>
#include <div64.h>
#include <asm/arch/imx-regs.h>
+#ifdef CONFIG_MXC_MMC
+#include <asm/arch/mxcmmc.h>
+#endif
/*
* get the system pll clock in Hz
*
@@ -143,6 +146,19 @@ int print_cpuinfo (void)
}
#endif
+/*
+ * Initializes on-chip MMC controllers.
+ * to override, implement board_mmc_init()
+ */
+int cpu_mmc_init(bd_t *bis)
+{
+#ifdef CONFIG_MXC_MMC
+ return mxc_mmc_init(bis);
+#else
+ return 0;
+#endif
+}
+
void imx_gpio_mode(int gpio_mode)
{
unsigned int pin = gpio_mode & GPIO_PIN_MASK;
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 1b0af12..6fa04b8 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -30,6 +30,7 @@ COBJS-$(CONFIG_ATMEL_MCI) += atmel_mci.o
COBJS-$(CONFIG_BFIN_SDH) += bfin_sdh.o
COBJS-$(CONFIG_OMAP3_MMC) += omap3_mmc.o
COBJS-$(CONFIG_FSL_ESDHC) += fsl_esdhc.o
+COBJS-$(CONFIG_MXC_MMC) += mxcmmc.o
COBJS-$(CONFIG_PXA_MMC) += pxa_mmc.o
COBJS := $(COBJS-y)
diff --git a/drivers/mmc/mxcmmc.c b/drivers/mmc/mxcmmc.c
new file mode 100644
index 0000000..9635d6e
--- /dev/null
+++ b/drivers/mmc/mxcmmc.c
@@ -0,0 +1,520 @@
+/*
+ * This is a driver for the SDHC controller found in Freescale MX2/MX3
+ * SoCs. It is basically the same hardware as found on MX1 (imxmmc.c).
+ * Unlike the hardware found on MX1, this hardware just works and does
+ * not need all the quirks found in imxmmc.c, hence the seperate driver.
+ *
+ * Copyright (C) 2009 Ilya Yanok, <ya...@emcraft.com>
+ * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.ha...@pengutronix.de>
+ * Copyright (C) 2006 Pavel Pisa, PiKRON <pp...@pikron.com>
+ *
+ * derived from pxamci.c by Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <config.h>
+#include <common.h>
+#include <command.h>
+#include <mmc.h>
+#include <part.h>
+#include <malloc.h>
+#include <mmc.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#ifdef CONFIG_MX27
+#include <asm/arch/clock.h>
+#endif
+
+#define DRIVER_NAME "mxc-mmc"
+
+#define MMC_REG_STR_STP_CLK 0x00
+#define MMC_REG_STATUS 0x04
+#define MMC_REG_CLK_RATE 0x08
+#define MMC_REG_CMD_DAT_CONT 0x0C
+#define MMC_REG_RES_TO 0x10
+#define MMC_REG_READ_TO 0x14
+#define MMC_REG_BLK_LEN 0x18
+#define MMC_REG_NOB 0x1C
+#define MMC_REG_REV_NO 0x20
+#define MMC_REG_INT_CNTR 0x24
+#define MMC_REG_CMD 0x28
+#define MMC_REG_ARG 0x2C
+#define MMC_REG_RES_FIFO 0x34
+#define MMC_REG_BUFFER_ACCESS 0x38
+
+#define STR_STP_CLK_RESET (1 << 3)
+#define STR_STP_CLK_START_CLK (1 << 1)
+#define STR_STP_CLK_STOP_CLK (1 << 0)
+
+#define STATUS_CARD_INSERTION (1 << 31)
+#define STATUS_CARD_REMOVAL (1 << 30)
+#define STATUS_YBUF_EMPTY (1 << 29)
+#define STATUS_XBUF_EMPTY (1 << 28)
+#define STATUS_YBUF_FULL (1 << 27)
+#define STATUS_XBUF_FULL (1 << 26)
+#define STATUS_BUF_UND_RUN (1 << 25)
+#define STATUS_BUF_OVFL (1 << 24)
+#define STATUS_SDIO_INT_ACTIVE (1 << 14)
+#define STATUS_END_CMD_RESP (1 << 13)
+#define STATUS_WRITE_OP_DONE (1 << 12)
+#define STATUS_DATA_TRANS_DONE (1 << 11)
+#define STATUS_READ_OP_DONE (1 << 11)
+#define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10)
+#define STATUS_CARD_BUS_CLK_RUN (1 << 8)
+#define STATUS_BUF_READ_RDY (1 << 7)
+#define STATUS_BUF_WRITE_RDY (1 << 6)
+#define STATUS_RESP_CRC_ERR (1 << 5)
+#define STATUS_CRC_READ_ERR (1 << 3)
+#define STATUS_CRC_WRITE_ERR (1 << 2)
+#define STATUS_TIME_OUT_RESP (1 << 1)
+#define STATUS_TIME_OUT_READ (1 << 0)
+#define STATUS_ERR_MASK 0x2f
+
+#define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12)
+#define CMD_DAT_CONT_STOP_READWAIT (1 << 11)
+#define CMD_DAT_CONT_START_READWAIT (1 << 10)
+#define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8)
+#define CMD_DAT_CONT_INIT (1 << 7)
+#define CMD_DAT_CONT_WRITE (1 << 4)
+#define CMD_DAT_CONT_DATA_ENABLE (1 << 3)
+#define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0)
+#define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0)
+#define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0)
+
+#define INT_SDIO_INT_WKP_EN (1 << 18)
+#define INT_CARD_INSERTION_WKP_EN (1 << 17)
+#define INT_CARD_REMOVAL_WKP_EN (1 << 16)
+#define INT_CARD_INSERTION_EN (1 << 15)
+#define INT_CARD_REMOVAL_EN (1 << 14)
+#define INT_SDIO_IRQ_EN (1 << 13)
+#define INT_DAT0_EN (1 << 12)
+#define INT_BUF_READ_EN (1 << 4)
+#define INT_BUF_WRITE_EN (1 << 3)
+#define INT_END_CMD_RES_EN (1 << 2)
+#define INT_WRITE_OP_DONE_EN (1 << 1)
+#define INT_READ_OP_EN (1 << 0)
+
+struct mxcmci_host {
+ struct mmc *mmc;
+ void *base;
+ int irq;
+ int detect_irq;
+ int dma;
+ int do_dma;
+ unsigned int power_mode;
+
+ struct mmc_cmd *cmd;
+ struct mmc_data *data;
+
+ unsigned int dma_nents;
+ unsigned int datasize;
+ unsigned int dma_dir;
+
+ u16 rev_no;
+ unsigned int cmdat;
+
+ int clock;
+};
+
+static struct mxcmci_host mxcmci_host;
+static struct mxcmci_host *host = &mxcmci_host;
+
+static inline int mxcmci_use_dma(struct mxcmci_host *host)
+{
+ return host->do_dma;
+}
+
+static void mxcmci_softreset(struct mxcmci_host *host)
+{
+ int i;
+
+ /* reset sequence */
+ writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK);
+ writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK,
+ host->base + MMC_REG_STR_STP_CLK);
+
+ for (i = 0; i < 8; i++)
+ writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
+
+ writew(0xff, host->base + MMC_REG_RES_TO);
+}
+
+static void mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
+{
+ unsigned int nob = data->blocks;
+ unsigned int blksz = data->blocksize;
+ unsigned int datasize = nob * blksz;
+
+ host->data = data;
+
+ writew(nob, host->base + MMC_REG_NOB);
+ writew(blksz, host->base + MMC_REG_BLK_LEN);
+ host->datasize = datasize;
+}
+
+static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_cmd *cmd,
+ unsigned int cmdat)
+{
+ if (host->cmd != NULL)
+ printf("mxcmci: error!\n");
+ host->cmd = cmd;
+
+ switch (cmd->resp_type) {
+ case MMC_RSP_R1: /* short CRC, OPCODE */
+ case MMC_RSP_R1b:/* short CRC, OPCODE, BUSY */
+ cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC;
+ break;
+ case MMC_RSP_R2: /* long 136 bit + CRC */
+ cmdat |= CMD_DAT_CONT_RESPONSE_136BIT;
+ break;
+ case MMC_RSP_R3: /* short */
+ cmdat |= CMD_DAT_CONT_RESPONSE_48BIT;
+ break;
+ case MMC_RSP_NONE:
+ break;
+ default:
+ printf("mxcmci: unhandled response type 0x%x\n",
+ cmd->resp_type);
+ return -EINVAL;
+ }
+
+ writew(cmd->cmdidx, host->base + MMC_REG_CMD);
+ writel(cmd->cmdarg, host->base + MMC_REG_ARG);
+ writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT);
+
+ return 0;
+}
+
+static void mxcmci_finish_request(struct mxcmci_host *host,
+ struct mmc_cmd *cmd, struct mmc_data *data)
+{
+ host->cmd = NULL;
+ host->data = NULL;
+}
+
+static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat)
+{
+ int data_error = 0;
+
+ if (stat & STATUS_ERR_MASK) {
+ printf("request failed. status: 0x%08x\n",
+ stat);
+ if (stat & STATUS_CRC_READ_ERR) {
+ data_error = -EILSEQ;
+ } else if (stat & STATUS_CRC_WRITE_ERR) {
+ u32 err_code = (stat >> 9) & 0x3;
+ if (err_code == 2) /* No CRC response */
+ data_error = TIMEOUT;
+ else
+ data_error = -EILSEQ;
+ } else if (stat & STATUS_TIME_OUT_READ) {
+ data_error = TIMEOUT;
+ } else {
+ data_error = -EIO;
+ }
+ }
+
+ host->data = NULL;
+
+ return data_error;
+}
+
+static int mxcmci_read_response(struct mxcmci_host *host, unsigned int stat)
+{
+ struct mmc_cmd *cmd = host->cmd;
+ int i;
+ u32 a, b, c;
+ u32 *resp = (u32 *)cmd->response;
+
+ if (!cmd)
+ return 0;
+
+ if (stat & STATUS_TIME_OUT_RESP) {
+ printf("CMD TIMEOUT\n");
+ return TIMEOUT;
+ } else if (stat & STATUS_RESP_CRC_ERR && cmd->resp_type & MMC_RSP_CRC) {
+ printf("cmd crc error\n");
+ return -EILSEQ;
+ }
+
+ if (cmd->resp_type & MMC_RSP_PRESENT) {
+ if (cmd->resp_type & MMC_RSP_136) {
+ for (i = 0; i < 4; i++) {
+ a = readw(host->base + MMC_REG_RES_FIFO);
+ b = readw(host->base + MMC_REG_RES_FIFO);
+ resp[i] = a << 16 | b;
+ }
+ } else {
+ a = readw(host->base + MMC_REG_RES_FIFO);
+ b = readw(host->base + MMC_REG_RES_FIFO);
+ c = readw(host->base + MMC_REG_RES_FIFO);
+ resp[0] = a << 24 | b << 8 | c >> 8;
+ }
+ }
+ return 0;
+}
+
+static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask)
+{
+ u32 stat;
+ unsigned long timeout = get_ticks() + CONFIG_SYS_HZ;
+
+ do {
+ stat = readl(host->base + MMC_REG_STATUS);
+ if (stat & STATUS_ERR_MASK)
+ return stat;
+ if (timeout < get_ticks())
+ return STATUS_TIME_OUT_READ;
+ if (stat & mask)
+ return 0;
+ } while (1);
+}
+
+static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes)
+{
+ unsigned int stat;
+ u32 *buf = _buf;
+
+ while (bytes > 3) {
+ stat = mxcmci_poll_status(host,
+ STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
+ if (stat)
+ return stat;
+ *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS);
+ bytes -= 4;
+ }
+
+ if (bytes) {
+ u8 *b = (u8 *)buf;
+ u32 tmp;
+
+ stat = mxcmci_poll_status(host,
+ STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE);
+ if (stat)
+ return stat;
+ tmp = readl(host->base + MMC_REG_BUFFER_ACCESS);
+ memcpy(b, &tmp, bytes);
+ }
+
+ return 0;
+}
+
+static int mxcmci_push(struct mxcmci_host *host, const void *_buf, int bytes)
+{
+ unsigned int stat;
+ const u32 *buf = _buf;
+
+ while (bytes > 3) {
+ stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
+ if (stat)
+ return stat;
+ writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS);
+ bytes -= 4;
+ }
+
+ if (bytes) {
+ const u8 *b = (u8 *)buf;
+ u32 tmp;
+
+ stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
+ if (stat)
+ return stat;
+
+ memcpy(&tmp, b, bytes);
+ writel(tmp, host->base + MMC_REG_BUFFER_ACCESS);
+ }
+
+ stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY);
+ if (stat)
+ return stat;
+
+ return 0;
+}
+
+static int mxcmci_transfer_data(struct mxcmci_host *host)
+{
+ struct mmc_data *data = host->data;
+ int stat;
+ unsigned long length;
+
+ length = data->blocks * data->blocksize;
+ host->datasize = 0;
+
+ if (data->flags & MMC_DATA_READ) {
+ stat = mxcmci_pull(host, data->dest, length);
+ if (stat)
+ return stat;
+ host->datasize += length;
+ } else {
+ stat = mxcmci_push(host, (const void *)(data->src), length);
+ if (stat)
+ return stat;
+ host->datasize += length;
+ stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE);
+ if (stat)
+ return stat;
+ }
+ return 0;
+}
+
+static int mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
+{
+ int datastat;
+ int ret;
+
+ ret = mxcmci_read_response(host, stat);
+
+ if (ret) {
+ mxcmci_finish_request(host, host->cmd, host->data);
+ return ret;
+ }
+
+ if (!host->data) {
+ mxcmci_finish_request(host, host->cmd, host->data);
+ return 0;
+ }
+
+ datastat = mxcmci_transfer_data(host);
+ ret = mxcmci_finish_data(host, datastat);
+ mxcmci_finish_request(host, host->cmd, host->data);
+ return ret;
+}
+
+static int mxcmci_request(struct mmc *mmc, struct mmc_cmd *cmd,
+ struct mmc_data *data)
+{
+ struct mxcmci_host *host = mmc->priv;
+ unsigned int cmdat = host->cmdat;
+ u32 stat;
+ int ret;
+
+ host->cmdat &= ~CMD_DAT_CONT_INIT;
+ if (data) {
+ mxcmci_setup_data(host, data);
+
+ cmdat |= CMD_DAT_CONT_DATA_ENABLE;
+
+ if (data->flags & MMC_DATA_WRITE)
+ cmdat |= CMD_DAT_CONT_WRITE;
+ }
+
+ if ((ret = mxcmci_start_cmd(host, cmd, cmdat))) {
+ mxcmci_finish_request(host, cmd, data);
+ return ret;
+ }
+
+ do {
+ stat = readl(host->base + MMC_REG_STATUS);
+ writel(stat, host->base + MMC_REG_STATUS);
+ } while (!(stat & STATUS_END_CMD_RESP));
+
+ return mxcmci_cmd_done(host, stat);
+}
+
+static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
+{
+ unsigned int divider;
+ int prescaler = 0;
+ unsigned long clk_in = imx_get_perclk2();
+
+ while (prescaler <= 0x800) {
+ for (divider = 1; divider <= 0xF; divider++) {
+ int x;
+
+ x = (clk_in / (divider + 1));
+
+ if (prescaler)
+ x /= (prescaler * 2);
+
+ if (x <= clk_ios)
+ break;
+ }
+ if (divider < 0x10)
+ break;
+
+ if (prescaler == 0)
+ prescaler = 1;
+ else
+ prescaler <<= 1;
+ }
+
+ writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE);
+}
+
+static void mxcmci_set_ios(struct mmc *mmc)
+{
+ struct mxcmci_host *host = mmc->priv;
+ if (mmc->bus_width == 4)
+ host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
+ else
+ host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
+
+ if (mmc->clock) {
+ mxcmci_set_clk_rate(host, mmc->clock);
+ writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
+ } else {
+ writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK);
+ }
+
+ host->clock = mmc->clock;
+}
+
+static int mxcmci_init(struct mmc *mmc)
+{
+ struct mxcmci_host *host = mmc->priv;
+
+ mxcmci_softreset(host);
+
+ host->rev_no = readw(host->base + MMC_REG_REV_NO);
+ if (host->rev_no != 0x400) {
+ printf("wrong rev.no. 0x%08x. aborting.\n",
+ host->rev_no);
+ return -ENODEV;
+ }
+
+ /* recommended in data sheet */
+ writew(0x2db4, host->base + MMC_REG_READ_TO);
+
+ writel(0, host->base + MMC_REG_INT_CNTR);
+
+ return 0;
+}
+
+static int mxcmci_initialize(bd_t *bis)
+{
+ struct mmc *mmc = NULL;
+
+ mmc = malloc(sizeof(struct mmc));
+
+ if (!mmc)
+ return -ENOMEM;
+
+ sprintf(mmc->name, "MXC MCI");
+ mmc->send_cmd = mxcmci_request;
+ mmc->set_ios = mxcmci_set_ios;
+ mmc->init = mxcmci_init;
+ mmc->host_caps = MMC_MODE_4BIT;
+
+ host->base = (void *)CONFIG_MXC_MCI_REGS_BASE;
+ mmc->priv = host;
+ host->mmc = mmc;
+
+ mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
+
+ mmc->f_min = imx_get_perclk2() >> 7;
+ mmc->f_max = imx_get_perclk2() >> 1;
+
+ mmc_register(mmc);
+
+ return 0;
+}
+
+int mxc_mmc_init(bd_t *bis)
+{
+ return mxcmci_initialize(bis);
+}
+
diff --git a/include/asm-arm/arch-mx27/mxcmmc.h
b/include/asm-arm/arch-mx27/mxcmmc.h
new file mode 100644
index 0000000..4c83cc7
--- /dev/null
+++ b/include/asm-arm/arch-mx27/mxcmmc.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2009 Ilya Yanok <ya...@emcraft.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef ASM_ARCH_MXCMMC_H
+#define ASM_ARCH_MXCMMC_H
+
+int mxc_mmc_init(bd_t *bis);
+
+#endif
--
1.6.0.6
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