Merge branch 'master' of git://git.denx.de/u-boot-mmc

common/Makefile

@@ -118,6 +118,7 @@ COBJS-$(CONFIG_CMD_MII) += miiphyutil.o
 COBJS-$(CONFIG_CMD_MII) += cmd_mii.o
 COBJS-$(CONFIG_CMD_MISC) += cmd_misc.o
 COBJS-$(CONFIG_CMD_MMC) += cmd_mmc.o
+COBJS-$(CONFIG_CMD_MMC_SPI) += cmd_mmc_spi.o
 COBJS-$(CONFIG_MP) += cmd_mp.o
 COBJS-$(CONFIG_CMD_MTDPARTS) += cmd_mtdparts.o
 COBJS-$(CONFIG_CMD_NAND) += cmd_nand.o

common/cmd_mmc.c

@@ -104,7 +104,8 @@ static void print_mmcinfo(struct mmc *mmc)
 			(mmc->version >> 4) & 0xf, mmc->version & 0xf);
 
 	printf("High Capacity: %s\n", mmc->high_capacity ? "Yes" : "No");
-	printf("Capacity: %lld\n", mmc->capacity);
+	puts("Capacity: ");
+	print_size(mmc->capacity, "\n");
 
 	printf("Bus Width: %d-bit\n", mmc->bus_width);
 }

common/cmd_mmc_spi.c

@@ -0,0 +1,88 @@
+/*
+ * Command for mmc_spi setup.
+ *
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <mmc.h>
+#include <spi.h>
+
+#ifndef CONFIG_MMC_SPI_BUS
+# define CONFIG_MMC_SPI_BUS 0
+#endif
+#ifndef CONFIG_MMC_SPI_CS
+# define CONFIG_MMC_SPI_CS 1
+#endif
+/* in SPI mode, MMC speed limit is 20MHz, while SD speed limit is 25MHz */
+#ifndef CONFIG_MMC_SPI_SPEED
+# define CONFIG_MMC_SPI_SPEED 25000000
+#endif
+/* MMC and SD specs only seem to care that sampling is on the
+ * rising edge ... meaning SPI modes 0 or 3.  So either SPI mode
+ * should be legit.  We'll use mode 0 since the steady state is 0,
+ * which is appropriate for hotplugging, unless the platform data
+ * specify mode 3 (if hardware is not compatible to mode 0).
+ */
+#ifndef CONFIG_MMC_SPI_MODE
+# define CONFIG_MMC_SPI_MODE SPI_MODE_0
+#endif
+
+static int do_mmc_spi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	uint bus = CONFIG_MMC_SPI_BUS;
+	uint cs = CONFIG_MMC_SPI_CS;
+	uint speed = CONFIG_MMC_SPI_SPEED;
+	uint mode = CONFIG_MMC_SPI_MODE;
+	char *endp;
+	struct mmc *mmc;
+
+	if (argc < 2)
+		goto usage;
+
+	cs = simple_strtoul(argv[1], &endp, 0);
+	if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
+		goto usage;
+	if (*endp == ':') {
+		if (endp[1] == 0)
+			goto usage;
+		bus = cs;
+		cs = simple_strtoul(endp + 1, &endp, 0);
+		if (*endp != 0)
+			goto usage;
+	}
+	if (argc >= 3) {
+		speed = simple_strtoul(argv[2], &endp, 0);
+		if (*argv[2] == 0 || *endp != 0)
+			goto usage;
+	}
+	if (argc >= 4) {
+		mode = simple_strtoul(argv[3], &endp, 16);
+		if (*argv[3] == 0 || *endp != 0)
+			goto usage;
+	}
+	if (!spi_cs_is_valid(bus, cs)) {
+		printf("Invalid SPI bus %u cs %u\n", bus, cs);
+		return 1;
+	}
+
+	mmc = mmc_spi_init(bus, cs, speed, mode);
+	if (!mmc) {
+		printf("Failed to create MMC Device\n");
+		return 1;
+	}
+	printf("%s: %d at %u:%u hz %u mode %u\n", mmc->name, mmc->block_dev.dev,
+	       bus, cs, speed, mode);
+	return 0;
+
+usage:
+	cmd_usage(cmdtp);
+	return 1;
+}
+
+U_BOOT_CMD(
+	mmc_spi,	4,	0,	do_mmc_spi,
+	"mmc_spi setup",
+	"[bus:]cs [hz] [mode]	- setup mmc_spi device"
+);

drivers/mmc/Makefile

@@ -31,6 +31,7 @@ COBJS-$(CONFIG_DAVINCI_MMC) += davinci_mmc.o
 COBJS-$(CONFIG_FSL_ESDHC) += fsl_esdhc.o
 COBJS-$(CONFIG_GENERIC_MMC) += mmc.o
 COBJS-$(CONFIG_GENERIC_ATMEL_MCI) += gen_atmel_mci.o
+COBJS-$(CONFIG_MMC_SPI) += mmc_spi.o
 COBJS-$(CONFIG_MXC_MMC) += mxcmmc.o
 COBJS-$(CONFIG_OMAP3_MMC) += omap3_mmc.o
 COBJS-$(CONFIG_OMAP_HSMMC) += omap_hsmmc.o

drivers/mmc/fsl_esdhc.c

@@ -332,11 +332,11 @@ esdhc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 		do {
 			irqstat = esdhc_read32(&regs->irqstat);
 
-			if (irqstat & DATA_ERR)
-				return COMM_ERR;
-
 			if (irqstat & IRQSTAT_DTOE)
 				return TIMEOUT;
+
+			if (irqstat & DATA_ERR)
+				return COMM_ERR;
 		} while (!(irqstat & IRQSTAT_TC) &&
 				(esdhc_read32(&regs->prsstat) & PRSSTAT_DLA));
 #endif

drivers/mmc/mmc.c

@@ -30,9 +30,13 @@
 #include <part.h>
 #include <malloc.h>
 #include <linux/list.h>
-#include <mmc.h>
 #include <div64.h>
 
+/* Set block count limit because of 16 bit register limit on some hardware*/
+#ifndef CONFIG_SYS_MMC_MAX_BLK_COUNT
+#define CONFIG_SYS_MMC_MAX_BLK_COUNT 65535
+#endif
+
 static struct list_head mmc_devices;
 static int cur_dev_num = -1;
 
@@ -45,7 +49,100 @@ int board_mmc_getcd(u8 *cd, struct mmc *mmc)__attribute__((weak,
 
 int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 {
+#ifdef CONFIG_MMC_TRACE
+	int ret;
+	int i;
+	u8 *ptr;
+
+	printf("CMD_SEND:%d\n", cmd->cmdidx);
+	printf("\t\tARG\t\t\t 0x%08X\n", cmd->cmdarg);
+	printf("\t\tFLAG\t\t\t %d\n", cmd->flags);
+	ret = mmc->send_cmd(mmc, cmd, data);
+	switch (cmd->resp_type) {
+		case MMC_RSP_NONE:
+			printf("\t\tMMC_RSP_NONE\n");
+			break;
+		case MMC_RSP_R1:
+			printf("\t\tMMC_RSP_R1,5,6,7 \t 0x%08X \n",
+				cmd->response[0]);
+			break;
+		case MMC_RSP_R1b:
+			printf("\t\tMMC_RSP_R1b\t\t 0x%08X \n",
+				cmd->response[0]);
+			break;
+		case MMC_RSP_R2:
+			printf("\t\tMMC_RSP_R2\t\t 0x%08X \n",
+				cmd->response[0]);
+			printf("\t\t          \t\t 0x%08X \n",
+				cmd->response[1]);
+			printf("\t\t          \t\t 0x%08X \n",
+				cmd->response[2]);
+			printf("\t\t          \t\t 0x%08X \n",
+				cmd->response[3]);
+			printf("\n");
+			printf("\t\t\t\t\tDUMPING DATA\n");
+			for (i = 0; i < 4; i++) {
+				int j;
+				printf("\t\t\t\t\t%03d - ", i*4);
+				ptr = &cmd->response[i];
+				ptr += 3;
+				for (j = 0; j < 4; j++)
+					printf("%02X ", *ptr--);
+				printf("\n");
+			}
+			break;
+		case MMC_RSP_R3:
+			printf("\t\tMMC_RSP_R3,4\t\t 0x%08X \n",
+				cmd->response[0]);
+			break;
+		default:
+			printf("\t\tERROR MMC rsp not supported\n");
+			break;
+	}
+	return ret;
+#else
 	return mmc->send_cmd(mmc, cmd, data);
+#endif
+}
+
+int mmc_send_status(struct mmc *mmc, int timeout)
+{
+	struct mmc_cmd cmd;
+	int err;
+#ifdef CONFIG_MMC_TRACE
+	int status;
+#endif
+
+	cmd.cmdidx = MMC_CMD_SEND_STATUS;
+	cmd.resp_type = MMC_RSP_R1;
+	cmd.cmdarg = 0;
+	cmd.flags = 0;
+
+	do {
+		err = mmc_send_cmd(mmc, &cmd, NULL);
+		if (err)
+			return err;
+		else if (cmd.response[0] & MMC_STATUS_RDY_FOR_DATA)
+			break;
+
+		udelay(1000);
+
+		if (cmd.response[0] & MMC_STATUS_MASK) {
+			printf("Status Error: 0x%08X\n", cmd.response[0]);
+			return COMM_ERR;
+		}
+	} while (timeout--);
+
+#ifdef CONFIG_MMC_TRACE
+	status = (cmd.response[0] & MMC_STATUS_CURR_STATE) >> 9;
+	printf("CURR STATE:%d\n", status);
+#endif
+	if (!timeout) {
+		printf("Timeout waiting card ready\n");
+		return TIMEOUT;
+	}
+
+	return 0;
 }
 
 int mmc_set_blocklen(struct mmc *mmc, int len)
@@ -82,6 +179,7 @@ mmc_write_blocks(struct mmc *mmc, ulong start, lbaint_t blkcnt, const void*src)
 {
 	struct mmc_cmd cmd;
 	struct mmc_data data;
+	int timeout = 1000;
 
 	if ((start + blkcnt) > mmc->block_dev.lba) {
 		printf("MMC: block number 0x%lx exceeds max(0x%lx)\n",
@@ -112,7 +210,10 @@ mmc_write_blocks(struct mmc *mmc, ulong start, lbaint_t blkcnt, const void*src)
 		return 0;
 	}
 
-	if (blkcnt > 1) {
+	/* SPI multiblock writes terminate using a special
+	 * token, not a STOP_TRANSMISSION request.
+	 */
+	if (!mmc_host_is_spi(mmc) && blkcnt > 1) {
 		cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
 		cmd.cmdarg = 0;
 		cmd.resp_type = MMC_RSP_R1b;
@@ -121,6 +222,9 @@ mmc_write_blocks(struct mmc *mmc, ulong start, lbaint_t blkcnt, const void*src)
 			printf("mmc fail to send stop cmd\n");
 			return 0;
 		}
+
+		/* Waiting for the ready status */
+		mmc_send_status(mmc, timeout);
 	}
 
 	return blkcnt;
@@ -139,11 +243,8 @@ mmc_bwrite(int dev_num, ulong start, lbaint_t blkcnt, const void*src)
 		return 0;
 
 	do {
-		/*
+		cur = (blocks_todo > CONFIG_SYS_MMC_MAX_BLK_COUNT) ?
-		 * The 65535 constraint comes from some hardware has
+		       CONFIG_SYS_MMC_MAX_BLK_COUNT : blocks_todo;
-		 * only 16 bit width block number counter
-		 */
-		cur = (blocks_todo > 65535) ? 65535 : blocks_todo;
 		if(mmc_write_blocks(mmc, start, cur, src) != cur)
 			return 0;
 		blocks_todo -= cur;
@@ -158,6 +259,7 @@ int mmc_read_blocks(struct mmc *mmc, void *dst, ulong start, lbaint_t blkcnt)
 {
 	struct mmc_cmd cmd;
 	struct mmc_data data;
+	int timeout = 1000;
 
 	if (blkcnt > 1)
 		cmd.cmdidx = MMC_CMD_READ_MULTIPLE_BLOCK;
@@ -189,6 +291,9 @@ int mmc_read_blocks(struct mmc *mmc, void *dst, ulong start, lbaint_t blkcnt)
 			printf("mmc fail to send stop cmd\n");
 			return 0;
 		}
+
+		/* Waiting for the ready status */
+		mmc_send_status(mmc, timeout);
 	}
 
 	return blkcnt;
@@ -215,11 +320,8 @@ static ulong mmc_bread(int dev_num, ulong start, lbaint_t blkcnt, void *dst)
 		return 0;
 
 	do {
-		/*
+		cur = (blocks_todo > CONFIG_SYS_MMC_MAX_BLK_COUNT) ?
-		 * The 65535 constraint comes from some hardware has
+		       CONFIG_SYS_MMC_MAX_BLK_COUNT : blocks_todo;
-		 * only 16 bit width block number counter
-		 */
-		cur = (blocks_todo > 65535) ? 65535 : blocks_todo;
 		if(mmc_read_blocks(mmc, dst, start, cur) != cur)
 			return 0;
 		blocks_todo -= cur;
@@ -280,7 +382,8 @@ sd_send_op_cond(struct mmc *mmc)
 		 * how to manage low voltages SD card is not yet
 		 * specified.
 		 */
-		cmd.cmdarg = mmc->voltages & 0xff8000;
+		cmd.cmdarg = mmc_host_is_spi(mmc) ? 0 :
+			(mmc->voltages & 0xff8000);
 
 		if (mmc->version == SD_VERSION_2)
 			cmd.cmdarg |= OCR_HCS;
@@ -299,6 +402,18 @@ sd_send_op_cond(struct mmc *mmc)
 	if (mmc->version != SD_VERSION_2)
 		mmc->version = SD_VERSION_1_0;
 
+	if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
+		cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
+		cmd.resp_type = MMC_RSP_R3;
+		cmd.cmdarg = 0;
+		cmd.flags = 0;
+
+		err = mmc_send_cmd(mmc, &cmd, NULL);
+
+		if (err)
+			return err;
+	}
+
 	mmc->ocr = cmd.response[0];
 
 	mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
@@ -309,17 +424,33 @@ sd_send_op_cond(struct mmc *mmc)
 
 int mmc_send_op_cond(struct mmc *mmc)
 {
-	int timeout = 1000;
+	int timeout = 10000;
 	struct mmc_cmd cmd;
 	int err;
 
 	/* Some cards seem to need this */
 	mmc_go_idle(mmc);
 
+ 	/* Asking to the card its capabilities */
+ 	cmd.cmdidx = MMC_CMD_SEND_OP_COND;
+ 	cmd.resp_type = MMC_RSP_R3;
+ 	cmd.cmdarg = 0;
+ 	cmd.flags = 0;
+ 
+ 	err = mmc_send_cmd(mmc, &cmd, NULL);
+ 
+ 	if (err)
+ 		return err;
+ 
+ 	udelay(1000);
+ 
 	do {
 		cmd.cmdidx = MMC_CMD_SEND_OP_COND;
 		cmd.resp_type = MMC_RSP_R3;
-		cmd.cmdarg = OCR_HCS | mmc->voltages;
+		cmd.cmdarg = (mmc_host_is_spi(mmc) ? 0 :
+				(mmc->voltages &
+				(cmd.response[0] & OCR_VOLTAGE_MASK)) |
+				(cmd.response[0] & OCR_ACCESS_MODE));
 		cmd.flags = 0;
 
 		err = mmc_send_cmd(mmc, &cmd, NULL);
@@ -333,6 +464,18 @@ int mmc_send_op_cond(struct mmc *mmc)
 	if (timeout <= 0)
 		return UNUSABLE_ERR;
 
+	if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
+		cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
+		cmd.resp_type = MMC_RSP_R3;
+		cmd.cmdarg = 0;
+		cmd.flags = 0;
+
+		err = mmc_send_cmd(mmc, &cmd, NULL);
+
+		if (err)
+			return err;
+	}
+
 	mmc->version = MMC_VERSION_UNKNOWN;
 	mmc->ocr = cmd.response[0];
 
@@ -369,6 +512,8 @@ int mmc_send_ext_csd(struct mmc *mmc, char *ext_csd)
 int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value)
 {
 	struct mmc_cmd cmd;
+	int timeout = 1000;
+	int ret;
 
 	cmd.cmdidx = MMC_CMD_SWITCH;
 	cmd.resp_type = MMC_RSP_R1b;
@@ -377,7 +522,13 @@ int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value)
 				 (value << 8);
 	cmd.flags = 0;
 
-	return mmc_send_cmd(mmc, &cmd, NULL);
+	ret = mmc_send_cmd(mmc, &cmd, NULL);
+
+	/* Waiting for the ready status */
+	mmc_send_status(mmc, timeout);
+
+	return ret;
+
 }
 
 int mmc_change_freq(struct mmc *mmc)
@@ -388,6 +539,9 @@ int mmc_change_freq(struct mmc *mmc)
 
 	mmc->card_caps = 0;
 
+	if (mmc_host_is_spi(mmc))
+		return 0;
+
 	/* Only version 4 supports high-speed */
 	if (mmc->version < MMC_VERSION_4)
 		return 0;
@@ -399,9 +553,6 @@ int mmc_change_freq(struct mmc *mmc)
 	if (err)
 		return err;
 
-	if (ext_csd[212] || ext_csd[213] || ext_csd[214] || ext_csd[215])
-		mmc->high_capacity = 1;
-
 	cardtype = ext_csd[196] & 0xf;
 
 	err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, 1);
@@ -461,6 +612,9 @@ int sd_change_freq(struct mmc *mmc)
 
 	mmc->card_caps = 0;
 
+	if (mmc_host_is_spi(mmc))
+		return 0;
+
 	/* Read the SCR to find out if this card supports higher speeds */
 	cmd.cmdidx = MMC_CMD_APP_CMD;
 	cmd.resp_type = MMC_RSP_R1;
@@ -512,6 +666,9 @@ retry_scr:
 			break;
 	}
 
+	if (mmc->scr[0] & SD_DATA_4BIT)
+		mmc->card_caps |= MMC_MODE_4BIT;
+
 	/* Version 1.0 doesn't support switching */
 	if (mmc->version == SD_VERSION_1_0)
 		return 0;
@@ -529,9 +686,6 @@ retry_scr:
 			break;
 	}
 
-	if (mmc->scr[0] & SD_DATA_4BIT)
-		mmc->card_caps |= MMC_MODE_4BIT;
-
 	/* If high-speed isn't supported, we return */
 	if (!(__be32_to_cpu(switch_status[3]) & SD_HIGHSPEED_SUPPORTED))
 		return 0;
@@ -549,7 +703,7 @@ retry_scr:
 
 /* frequency bases */
 /* divided by 10 to be nice to platforms without floating point */
-int fbase[] = {
+static const int fbase[] = {
 	10000,
 	100000,
 	1000000,
@@ -559,7 +713,7 @@ int fbase[] = {
 /* Multiplier values for TRAN_SPEED.  Multiplied by 10 to be nice
  * to platforms without floating point.
  */
-int multipliers[] = {
+static const int multipliers[] = {
 	0,	/* reserved */
 	10,
 	12,
@@ -610,9 +764,24 @@ int mmc_startup(struct mmc *mmc)
 	u64 cmult, csize;
 	struct mmc_cmd cmd;
 	char ext_csd[512];
+	int timeout = 1000;
+
+#ifdef CONFIG_MMC_SPI_CRC_ON
+	if (mmc_host_is_spi(mmc)) { /* enable CRC check for spi */
+		cmd.cmdidx = MMC_CMD_SPI_CRC_ON_OFF;
+		cmd.resp_type = MMC_RSP_R1;
+		cmd.cmdarg = 1;
+		cmd.flags = 0;
+		err = mmc_send_cmd(mmc, &cmd, NULL);
+
+		if (err)
+			return err;
+	}
+#endif
 
 	/* Put the Card in Identify Mode */
-	cmd.cmdidx = MMC_CMD_ALL_SEND_CID;
+	cmd.cmdidx = mmc_host_is_spi(mmc) ? MMC_CMD_SEND_CID :
+		MMC_CMD_ALL_SEND_CID; /* cmd not supported in spi */
 	cmd.resp_type = MMC_RSP_R2;
 	cmd.cmdarg = 0;
 	cmd.flags = 0;
@@ -629,6 +798,7 @@ int mmc_startup(struct mmc *mmc)
 	 * For SD cards, get the Relatvie Address.
 	 * This also puts the cards into Standby State
 	 */
+	if (!mmc_host_is_spi(mmc)) { /* cmd not supported in spi */
 		cmd.cmdidx = SD_CMD_SEND_RELATIVE_ADDR;
 		cmd.cmdarg = mmc->rca << 16;
 		cmd.resp_type = MMC_RSP_R6;
@@ -641,6 +811,7 @@ int mmc_startup(struct mmc *mmc)
 
 		if (IS_SD(mmc))
 			mmc->rca = (cmd.response[0] >> 16) & 0xffff;
+	}
 
 	/* Get the Card-Specific Data */
 	cmd.cmdidx = MMC_CMD_SEND_CSD;
@@ -650,6 +821,9 @@ int mmc_startup(struct mmc *mmc)
 
 	err = mmc_send_cmd(mmc, &cmd, NULL);
 
+	/* Waiting for the ready status */
+	mmc_send_status(mmc, timeout);
+
 	if (err)
 		return err;
 
@@ -716,6 +890,7 @@ int mmc_startup(struct mmc *mmc)
 		mmc->write_bl_len = 512;
 
 	/* Select the card, and put it into Transfer Mode */
+	if (!mmc_host_is_spi(mmc)) { /* cmd not supported in spi */
 		cmd.cmdidx = MMC_CMD_SELECT_CARD;
 		cmd.resp_type = MMC_RSP_R1b;
 		cmd.cmdarg = mmc->rca << 16;
@@ -724,6 +899,7 @@ int mmc_startup(struct mmc *mmc)
 
 		if (err)
 			return err;
+	}
 
 	if (!IS_SD(mmc) && (mmc->version >= MMC_VERSION_4)) {
 		/* check  ext_csd version and capacity */

drivers/mmc/mmc_spi.c

@@ -0,0 +1,280 @@
+/*
+ * generic mmc spi driver
+ *
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ * Licensed under the GPL-2 or later.
+ */
+#include <common.h>
+#include <malloc.h>
+#include <part.h>
+#include <mmc.h>
+#include <spi.h>
+#include <crc.h>
+#include <linux/crc7.h>
+#include <linux/byteorder/swab.h>
+
+/* MMC/SD in SPI mode reports R1 status always */
+#define R1_SPI_IDLE		(1 << 0)
+#define R1_SPI_ERASE_RESET	(1 << 1)
+#define R1_SPI_ILLEGAL_COMMAND	(1 << 2)
+#define R1_SPI_COM_CRC		(1 << 3)
+#define R1_SPI_ERASE_SEQ	(1 << 4)
+#define R1_SPI_ADDRESS		(1 << 5)
+#define R1_SPI_PARAMETER	(1 << 6)
+/* R1 bit 7 is always zero, reuse this bit for error */
+#define R1_SPI_ERROR		(1 << 7)
+
+/* Response tokens used to ack each block written: */
+#define SPI_MMC_RESPONSE_CODE(x)	((x) & 0x1f)
+#define SPI_RESPONSE_ACCEPTED		((2 << 1)|1)
+#define SPI_RESPONSE_CRC_ERR		((5 << 1)|1)
+#define SPI_RESPONSE_WRITE_ERR		((6 << 1)|1)
+
+/* Read and write blocks start with these tokens and end with crc;
+ * on error, read tokens act like a subset of R2_SPI_* values.
+ */
+#define SPI_TOKEN_SINGLE	0xfe	/* single block r/w, multiblock read */
+#define SPI_TOKEN_MULTI_WRITE	0xfc	/* multiblock write */
+#define SPI_TOKEN_STOP_TRAN	0xfd	/* terminate multiblock write */
+
+/* MMC SPI commands start with a start bit "0" and a transmit bit "1" */
+#define MMC_SPI_CMD(x) (0x40 | (x & 0x3f))
+
+/* bus capability */
+#define MMC_SPI_VOLTAGE (MMC_VDD_32_33 | MMC_VDD_33_34)
+#define MMC_SPI_MIN_CLOCK 400000 /* 400KHz to meet MMC spec */
+
+/* timeout value */
+#define CTOUT 8
+#define RTOUT 3000000 /* 1 sec */
+#define WTOUT 3000000 /* 1 sec */
+
+static uint mmc_spi_sendcmd(struct mmc *mmc, ushort cmdidx, u32 cmdarg)
+{
+	struct spi_slave *spi = mmc->priv;
+	u8 cmdo[7];
+	u8 r1;
+	int i;
+	cmdo[0] = 0xff;
+	cmdo[1] = MMC_SPI_CMD(cmdidx);
+	cmdo[2] = cmdarg >> 24;
+	cmdo[3] = cmdarg >> 16;
+	cmdo[4] = cmdarg >> 8;
+	cmdo[5] = cmdarg;
+	cmdo[6] = (crc7(0, &cmdo[1], 5) << 1) | 0x01;
+	spi_xfer(spi, sizeof(cmdo) * 8, cmdo, NULL, 0);
+	for (i = 0; i < CTOUT; i++) {
+		spi_xfer(spi, 1 * 8, NULL, &r1, 0);
+		if (i && (r1 & 0x80) == 0) /* r1 response */
+			break;
+	}
+	debug("%s:cmd%d resp%d %x\n", __func__, cmdidx, i, r1);
+	return r1;
+}
+
+static uint mmc_spi_readdata(struct mmc *mmc, void *xbuf,
+				u32 bcnt, u32 bsize)
+{
+	struct spi_slave *spi = mmc->priv;
+	u8 *buf = xbuf;
+	u8 r1;
+	u16 crc;
+	int i;
+	while (bcnt--) {
+		for (i = 0; i < RTOUT; i++) {
+			spi_xfer(spi, 1 * 8, NULL, &r1, 0);
+			if (r1 != 0xff) /* data token */
+				break;
+		}
+		debug("%s:tok%d %x\n", __func__, i, r1);
+		if (r1 == SPI_TOKEN_SINGLE) {
+			spi_xfer(spi, bsize * 8, NULL, buf, 0);
+			spi_xfer(spi, 2 * 8, NULL, &crc, 0);
+#ifdef CONFIG_MMC_SPI_CRC_ON
+			if (swab16(cyg_crc16(buf, bsize)) != crc) {
+				debug("%s: CRC error\n", mmc->name);
+				r1 = R1_SPI_COM_CRC;
+				break;
+			}
+#endif
+			r1 = 0;
+		} else {
+			r1 = R1_SPI_ERROR;
+			break;
+		}
+		buf += bsize;
+	}
+	return r1;
+}
+
+static uint mmc_spi_writedata(struct mmc *mmc, const void *xbuf,
+			      u32 bcnt, u32 bsize, int multi)
+{
+	struct spi_slave *spi = mmc->priv;
+	const u8 *buf = xbuf;
+	u8 r1;
+	u16 crc;
+	u8 tok[2];
+	int i;
+	tok[0] = 0xff;
+	tok[1] = multi ? SPI_TOKEN_MULTI_WRITE : SPI_TOKEN_SINGLE;
+	while (bcnt--) {
+#ifdef CONFIG_MMC_SPI_CRC_ON
+		crc = swab16(cyg_crc16((u8 *)buf, bsize));
+#endif
+		spi_xfer(spi, 2 * 8, tok, NULL, 0);
+		spi_xfer(spi, bsize * 8, buf, NULL, 0);
+		spi_xfer(spi, 2 * 8, &crc, NULL, 0);
+		for (i = 0; i < CTOUT; i++) {
+			spi_xfer(spi, 1 * 8, NULL, &r1, 0);
+			if ((r1 & 0x10) == 0) /* response token */
+				break;
+		}
+		debug("%s:tok%d %x\n", __func__, i, r1);
+		if (SPI_MMC_RESPONSE_CODE(r1) == SPI_RESPONSE_ACCEPTED) {
+			for (i = 0; i < WTOUT; i++) { /* wait busy */
+				spi_xfer(spi, 1 * 8, NULL, &r1, 0);
+				if (i && r1 == 0xff) {
+					r1 = 0;
+					break;
+				}
+			}
+			if (i == WTOUT) {
+				debug("%s:wtout %x\n", __func__, r1);
+				r1 = R1_SPI_ERROR;
+				break;
+			}
+		} else {
+			debug("%s: err %x\n", __func__, r1);
+			r1 = R1_SPI_COM_CRC;
+			break;
+		}
+		buf += bsize;
+	}
+	if (multi && bcnt == -1) { /* stop multi write */
+		tok[1] = SPI_TOKEN_STOP_TRAN;
+		spi_xfer(spi, 2 * 8, tok, NULL, 0);
+		for (i = 0; i < WTOUT; i++) { /* wait busy */
+			spi_xfer(spi, 1 * 8, NULL, &r1, 0);
+			if (i && r1 == 0xff) {
+				r1 = 0;
+				break;
+			}
+		}
+		if (i == WTOUT) {
+			debug("%s:wstop %x\n", __func__, r1);
+			r1 = R1_SPI_ERROR;
+		}
+	}
+	return r1;
+}
+
+static int mmc_spi_request(struct mmc *mmc, struct mmc_cmd *cmd,
+		struct mmc_data *data)
+{
+	struct spi_slave *spi = mmc->priv;
+	u8 r1;
+	int i;
+	int ret = 0;
+	debug("%s:cmd%d %x %x %x\n", __func__,
+	      cmd->cmdidx, cmd->resp_type, cmd->cmdarg, cmd->flags);
+	spi_claim_bus(spi);
+	spi_cs_activate(spi);
+	r1 = mmc_spi_sendcmd(mmc, cmd->cmdidx, cmd->cmdarg);
+	if (r1 == 0xff) { /* no response */
+		ret = NO_CARD_ERR;
+		goto done;
+	} else if (r1 & R1_SPI_COM_CRC) {
+		ret = COMM_ERR;
+		goto done;
+	} else if (r1 & ~R1_SPI_IDLE) { /* other errors */
+		ret = TIMEOUT;
+		goto done;
+	} else if (cmd->resp_type == MMC_RSP_R2) {
+		r1 = mmc_spi_readdata(mmc, cmd->response, 1, 16);
+		for (i = 0; i < 4; i++)
+			cmd->response[i] = swab32(cmd->response[i]);
+		debug("r128 %x %x %x %x\n", cmd->response[0], cmd->response[1],
+		      cmd->response[2], cmd->response[3]);
+	} else if (!data) {
+		switch (cmd->cmdidx) {
+		case SD_CMD_APP_SEND_OP_COND:
+		case MMC_CMD_SEND_OP_COND:
+			cmd->response[0] = (r1 & R1_SPI_IDLE) ? 0 : OCR_BUSY;
+			break;
+		case SD_CMD_SEND_IF_COND:
+		case MMC_CMD_SPI_READ_OCR:
+			spi_xfer(spi, 4 * 8, NULL, cmd->response, 0);
+			cmd->response[0] = swab32(cmd->response[0]);
+			debug("r32 %x\n", cmd->response[0]);
+			break;
+		}
+	} else {
+		debug("%s:data %x %x %x\n", __func__,
+		      data->flags, data->blocks, data->blocksize);
+		if (data->flags == MMC_DATA_READ)
+			r1 = mmc_spi_readdata(mmc, data->dest,
+				data->blocks, data->blocksize);
+		else if  (data->flags == MMC_DATA_WRITE)
+			r1 = mmc_spi_writedata(mmc, data->src,
+				data->blocks, data->blocksize,
+				(cmd->cmdidx == MMC_CMD_WRITE_MULTIPLE_BLOCK));
+		if (r1 & R1_SPI_COM_CRC)
+			ret = COMM_ERR;
+		else if (r1) /* other errors */
+			ret = TIMEOUT;
+	}
+done:
+	spi_cs_deactivate(spi);
+	spi_release_bus(spi);
+	return ret;
+}
+
+static void mmc_spi_set_ios(struct mmc *mmc)
+{
+	struct spi_slave *spi = mmc->priv;
+	debug("%s: clock %u\n", __func__, mmc->clock);
+	if (mmc->clock)
+		spi_set_speed(spi, mmc->clock);
+}
+
+static int mmc_spi_init_p(struct mmc *mmc)
+{
+	struct spi_slave *spi = mmc->priv;
+	mmc->clock = 0;
+	spi_set_speed(spi, MMC_SPI_MIN_CLOCK);
+	spi_claim_bus(spi);
+	/* cs deactivated for 100+ clock */
+	spi_xfer(spi, 18 * 8, NULL, NULL, 0);
+	spi_release_bus(spi);
+	return 0;
+}
+
+struct mmc *mmc_spi_init(uint bus, uint cs, uint speed, uint mode)
+{
+	struct mmc *mmc;
+
+	mmc = malloc(sizeof(*mmc));
+	if (!mmc)
+		return NULL;
+	memset(mmc, 0, sizeof(*mmc));
+	mmc->priv = spi_setup_slave(bus, cs, speed, mode);
+	if (!mmc->priv) {
+		free(mmc);
+		return NULL;
+	}
+	sprintf(mmc->name, "MMC_SPI");
+	mmc->send_cmd = mmc_spi_request;
+	mmc->set_ios = mmc_spi_set_ios;
+	mmc->init = mmc_spi_init_p;
+	mmc->host_caps = MMC_MODE_SPI;
+
+	mmc->voltages = MMC_SPI_VOLTAGE;
+	mmc->f_max = speed;
+	mmc->f_min = MMC_SPI_MIN_CLOCK;
+	mmc->block_dev.part_type = PART_TYPE_DOS;
+
+	mmc_register(mmc);
+
+	return mmc;
+}

drivers/spi/cf_spi.c

@@ -49,6 +49,14 @@ extern void cfspi_release_bus(uint bus, uint cs);
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#ifndef CONFIG_SPI_IDLE_VAL
+#if defined(CONFIG_SPI_MMC)
+#define CONFIG_SPI_IDLE_VAL	0xFFFF
+#else
+#define CONFIG_SPI_IDLE_VAL	0x0
+#endif
+#endif
+
 #if defined(CONFIG_CF_DSPI)
 /* DSPI specific mode */
 #define SPI_MODE_MOD	0x00200000
@@ -145,7 +153,7 @@ int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout,
 			}
 
 			if (din != NULL) {
-				cfspi_tx(ctrl, 0);
+				cfspi_tx(ctrl, CONFIG_SPI_IDLE_VAL);
 				if (cfslave->charbit == 16)
 					*spi_rd16++ = cfspi_rx();
 				else
@@ -169,7 +177,7 @@ int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout,
 		}
 
 		if (din != NULL) {
-			cfspi_tx(ctrl, 0);
+			cfspi_tx(ctrl, CONFIG_SPI_IDLE_VAL);
 			if (cfslave->charbit == 16)
 				*spi_rd16 = cfspi_rx();
 			else
@@ -177,7 +185,7 @@ int cfspi_xfer(struct spi_slave *slave, uint bitlen, const void *dout,
 		}
 	} else {
 		/* dummy read */
-		cfspi_tx(ctrl, 0);
+		cfspi_tx(ctrl, CONFIG_SPI_IDLE_VAL);
 		cfspi_rx();
 	}
 

include/mmc.h

@@ -44,6 +44,7 @@
 #define MMC_MODE_HS_52MHz	0x010
 #define MMC_MODE_4BIT		0x100
 #define MMC_MODE_8BIT		0x200
+#define MMC_MODE_SPI		0x400
 
 #define SD_DATA_4BIT	0x00040000
 
@@ -75,6 +76,8 @@
 #define MMC_CMD_WRITE_SINGLE_BLOCK	24
 #define MMC_CMD_WRITE_MULTIPLE_BLOCK	25
 #define MMC_CMD_APP_CMD			55
+#define MMC_CMD_SPI_READ_OCR		58
+#define MMC_CMD_SPI_CRC_ON_OFF		59
 
 #define SD_CMD_SEND_RELATIVE_ADDR	3
 #define SD_CMD_SWITCH_FUNC		6
@@ -93,6 +96,12 @@
 
 #define OCR_BUSY	0x80000000
 #define OCR_HCS		0x40000000
+#define OCR_VOLTAGE_MASK	0x007FFF80
+#define OCR_ACCESS_MODE		0x60000000
+
+#define MMC_STATUS_MASK		(~0x0206BF7F)
+#define MMC_STATUS_RDY_FOR_DATA (1<<8)
+#define MMC_STATUS_CURR_STATE	(0xf<<9)
 
 #define MMC_VDD_165_195		0x00000080	/* VDD voltage 1.65 - 1.95 */
 #define MMC_VDD_20_21		0x00000100	/* VDD voltage 2.0 ~ 2.1 */
@@ -291,6 +300,8 @@ int board_mmc_getcd(u8 *cd, struct mmc *mmc);
 
 #ifdef CONFIG_GENERIC_MMC
 int atmel_mci_init(void *regs);
+#define mmc_host_is_spi(mmc)	((mmc)->host_caps & MMC_MODE_SPI)
+struct mmc *mmc_spi_init(uint bus, uint cs, uint speed, uint mode);
 #else
 int mmc_legacy_init(int verbose);
 #endif