Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc: (67 commits)
  mmc: don't use weight32()
  pxamci: support arbitrary block size
  sdio: make the IRQ thread more resilient in the presence of bad states
  sdio: fix IRQ diagnostic message
  sdhci: remove old dma module params
  sdhci: add SDHCI_QUIRK_BROKEN_DMA quirk
  sdhci: remove DMA capability check from controller's PCI Class reg
  sdhci: fix a typo
  mmc: Disabler for Ricoh MMC controller
  sdio: adaptive interrupt polling
  mmc: pxamci: add SDIO card interrupt reporting capability
  mmc: pxamci: set proper buswidth capabilities according to PXA flavor
  mmc: pxamci: set proper block capabilities according to PXA flavor
  mmc: pxamci: better pending IRQ determination
  arm: i.MX/MX1 SDHC implements SD cards read-only switch read-back
  mmc: add led trigger
  mmc_spi host driver
  MMC core learns about SPI
  MMC/SD card driver learns SPI
  MMC headers learn about SPI
  ...

MAINTAINERS

@@ -2561,12 +2561,18 @@ L:	linux-kernel@vger.kernel.org
 W:	http://www.atnf.csiro.au/~rgooch/linux/kernel-patches.html
 S:	Maintained
 
-MULTIMEDIA CARD (MMC) AND SECURE DIGITAL (SD) SUBSYSTEM
+MULTIMEDIA CARD (MMC), SECURE DIGITAL (SD) AND SDIO SUBSYSTEM
 P:	Pierre Ossman
 M:	drzeus-mmc@drzeus.cx
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 
+MULTIMEDIA CARD (MMC) ETC. OVER SPI
+P:	David Brownell
+M:	dbrownell@users.sourceforge.net
+L:	linux-kernel@vger.kernel.org
+S:	Odd fixes
+
 MULTISOUND SOUND DRIVER
 P:	Andrew Veliath
 M:	andrewtv@usa.net

arch/arm/mach-imx/mx1ads.c

@@ -116,7 +116,7 @@ static struct platform_device *devices[] __initdata = {
 };
 
 #ifdef CONFIG_MMC_IMX
-static int mx1ads_mmc_card_present(void)
+static int mx1ads_mmc_card_present(struct device *dev)
 {
 	/* MMC/SD Card Detect is PB 20 on MX1ADS V1.0.7 */
 	return (SSR(1) & (1 << 20) ? 0 : 1);

drivers/mmc/card/Kconfig

@@ -32,3 +32,10 @@ config MMC_BLOCK_BOUNCE
 
 	  If unsure, say Y here.
 
+config SDIO_UART
+	tristate "SDIO UART/GPS class support"
+	depends on MMC
+	help
+	  SDIO function driver for SDIO cards that implements the UART
+	  class, as well as the GPS class which appears like a UART.
+

drivers/mmc/card/Makefile

@@ -9,3 +9,5 @@ endif
 obj-$(CONFIG_MMC_BLOCK)		+= mmc_block.o
 mmc_block-objs			:= block.o queue.o
 
+obj-$(CONFIG_SDIO_UART)		+= sdio_uart.o
+

drivers/mmc/card/block.c

@@ -151,17 +151,19 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 
 	cmd.opcode = MMC_APP_CMD;
 	cmd.arg = card->rca << 16;
-	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 
 	err = mmc_wait_for_cmd(card->host, &cmd, 0);
-	if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD))
+	if (err)
+		return (u32)-1;
+	if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 		return (u32)-1;
 
 	memset(&cmd, 0, sizeof(struct mmc_command));
 
 	cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 	cmd.arg = 0;
-	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 
 	memset(&data, 0, sizeof(struct mmc_data));
 
@@ -192,7 +194,7 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 
 	mmc_wait_for_req(card->host, &mrq);
 
-	if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE)
+	if (cmd.error || data.error)
 		return (u32)-1;
 
 	blocks = ntohl(blocks);
@@ -220,17 +222,15 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 		brq.cmd.arg = req->sector;
 		if (!mmc_card_blockaddr(card))
 			brq.cmd.arg <<= 9;
-		brq.cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+		brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 		brq.data.blksz = 1 << md->block_bits;
 		brq.stop.opcode = MMC_STOP_TRANSMISSION;
 		brq.stop.arg = 0;
-		brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
+		brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 		brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
 		if (brq.data.blocks > card->host->max_blk_count)
 			brq.data.blocks = card->host->max_blk_count;
 
-		mmc_set_data_timeout(&brq.data, card, rq_data_dir(req) != READ);
-
 		/*
 		 * If the host doesn't support multiple block writes, force
 		 * block writes to single block. SD cards are excepted from
@@ -243,7 +243,11 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 			brq.data.blocks = 1;
 
 		if (brq.data.blocks > 1) {
-			brq.data.flags |= MMC_DATA_MULTI;
+			/* SPI multiblock writes terminate using a special
+			 * token, not a STOP_TRANSMISSION request.
+			 */
+			if (!mmc_host_is_spi(card->host)
+					|| rq_data_dir(req) == READ)
 				brq.mrq.stop = &brq.stop;
 			readcmd = MMC_READ_MULTIPLE_BLOCK;
 			writecmd = MMC_WRITE_MULTIPLE_BLOCK;
@@ -261,6 +265,8 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 			brq.data.flags |= MMC_DATA_WRITE;
 		}
 
+		mmc_set_data_timeout(&brq.data, card);
+
 		brq.data.sg = mq->sg;
 		brq.data.sg_len = mmc_queue_map_sg(mq);
 
@@ -302,7 +308,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 			goto cmd_err;
 		}
 
-		if (rq_data_dir(req) != READ) {
+		if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
 			do {
 				int err;
 
@@ -510,7 +516,7 @@ mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 	mmc_claim_host(card->host);
 	cmd.opcode = MMC_SET_BLOCKLEN;
 	cmd.arg = 1 << md->block_bits;
-	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 	err = mmc_wait_for_cmd(card->host, &cmd, 5);
 	mmc_release_host(card->host);
 

drivers/mmc/core/Makefile

@@ -8,5 +8,7 @@ endif
 
 obj-$(CONFIG_MMC)		+= mmc_core.o
 mmc_core-y			:= core.o sysfs.o bus.o host.o \
-				   mmc.o mmc_ops.o sd.o sd_ops.o
+				   mmc.o mmc_ops.o sd.o sd_ops.o \
+				   sdio.o sdio_ops.o sdio_bus.o \
+				   sdio_cis.o sdio_io.o sdio_irq.o
 

drivers/mmc/core/bus.c

@@ -19,6 +19,7 @@
 
 #include "sysfs.h"
 #include "core.h"
+#include "sdio_cis.h"
 #include "bus.h"
 
 #define dev_to_mmc_card(d)	container_of(d, struct mmc_card, dev)
@@ -34,6 +35,8 @@ static ssize_t mmc_type_show(struct device *dev,
 		return sprintf(buf, "MMC\n");
 	case MMC_TYPE_SD:
 		return sprintf(buf, "SD\n");
+	case MMC_TYPE_SDIO:
+		return sprintf(buf, "SDIO\n");
 	default:
 		return -EFAULT;
 	}
@@ -59,28 +62,34 @@ mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
 		int buf_size)
 {
 	struct mmc_card *card = dev_to_mmc_card(dev);
-	int retval = 0, i = 0, length = 0;
-
-#define add_env(fmt,val) do {					\
-	retval = add_uevent_var(envp, num_envp, &i,		\
-				buf, buf_size, &length,		\
-				fmt, val);			\
-	if (retval)						\
-		return retval;					\
-} while (0);
+	const char *type;
+	int i = 0, length = 0;
 
 	switch (card->type) {
 	case MMC_TYPE_MMC:
-		add_env("MMC_TYPE=%s", "MMC");
+		type = "MMC";
 		break;
 	case MMC_TYPE_SD:
-		add_env("MMC_TYPE=%s", "SD");
+		type = "SD";
 		break;
+	case MMC_TYPE_SDIO:
+		type = "SDIO";
+		break;
+	default:
+		type = NULL;
 	}
 
-	add_env("MMC_NAME=%s", mmc_card_name(card));
+	if (type) {
+		if (add_uevent_var(envp, num_envp, &i,
+				buf, buf_size, &length,
+				"MMC_TYPE=%s", type))
+			return -ENOMEM;
+	}
 
-#undef add_env
+	if (add_uevent_var(envp, num_envp, &i,
+			buf, buf_size, &length,
+			"MMC_NAME=%s", mmc_card_name(card)))
+		return -ENOMEM;
 
 	envp[i] = NULL;
 
@@ -176,6 +185,11 @@ static void mmc_release_card(struct device *dev)
 {
 	struct mmc_card *card = dev_to_mmc_card(dev);
 
+	sdio_free_common_cis(card);
+
+	if (card->info)
+		kfree(card->info);
+
 	kfree(card);
 }
 
@@ -221,15 +235,25 @@ int mmc_add_card(struct mmc_card *card)
 		if (mmc_card_blockaddr(card))
 			type = "SDHC";
 		break;
+	case MMC_TYPE_SDIO:
+		type = "SDIO";
+		break;
 	default:
 		type = "?";
 		break;
 	}
 
+	if (mmc_host_is_spi(card->host)) {
+		printk(KERN_INFO "%s: new %s%s card on SPI\n",
+			mmc_hostname(card->host),
+			mmc_card_highspeed(card) ? "high speed " : "",
+			type);
+	} else {
 		printk(KERN_INFO "%s: new %s%s card at address %04x\n",
 			mmc_hostname(card->host),
 			mmc_card_highspeed(card) ? "high speed " : "",
 			type, card->rca);
+	}
 
 	card->dev.uevent_suppress = 1;
 
@@ -261,8 +285,13 @@ int mmc_add_card(struct mmc_card *card)
 void mmc_remove_card(struct mmc_card *card)
 {
 	if (mmc_card_present(card)) {
+		if (mmc_host_is_spi(card->host)) {
+			printk(KERN_INFO "%s: SPI card removed\n",
+				mmc_hostname(card->host));
+		} else {
 			printk(KERN_INFO "%s: card %04x removed\n",
 				mmc_hostname(card->host), card->rca);
+		}
 
 		if (card->host->bus_ops->sysfs_remove)
 			card->host->bus_ops->sysfs_remove(card->host, card);

drivers/mmc/core/core.c

@@ -18,6 +18,7 @@
 #include <linux/delay.h>
 #include <linux/pagemap.h>
 #include <linux/err.h>
+#include <linux/leds.h>
 #include <asm/scatterlist.h>
 #include <linux/scatterlist.h>
 
@@ -29,15 +30,26 @@
 #include "core.h"
 #include "bus.h"
 #include "host.h"
+#include "sdio_bus.h"
 
 #include "mmc_ops.h"
 #include "sd_ops.h"
+#include "sdio_ops.h"
 
 extern int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
 extern int mmc_attach_sd(struct mmc_host *host, u32 ocr);
+extern int mmc_attach_sdio(struct mmc_host *host, u32 ocr);
 
 static struct workqueue_struct *workqueue;
 
+/*
+ * Enabling software CRCs on the data blocks can be a significant (30%)
+ * performance cost, and for other reasons may not always be desired.
+ * So we allow it it to be disabled.
+ */
+int use_spi_crc = 1;
+module_param(use_spi_crc, bool, 0);
+
 /*
  * Internal function. Schedule delayed work in the MMC work queue.
  */
@@ -68,6 +80,11 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
 	struct mmc_command *cmd = mrq->cmd;
 	int err = cmd->error;
 
+	if (err && cmd->retries && mmc_host_is_spi(host)) {
+		if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
+			cmd->retries = 0;
+	}
+
 	if (err && cmd->retries) {
 		pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
 			mmc_hostname(host), cmd->opcode, err);
@@ -76,6 +93,8 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
 		cmd->error = 0;
 		host->ops->request(host, mrq);
 	} else {
+		led_trigger_event(host->led, LED_OFF);
+
 		pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
 			mmc_hostname(host), cmd->opcode, err,
 			cmd->resp[0], cmd->resp[1],
@@ -118,7 +137,7 @@ mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
 			"tsac %d ms nsac %d\n",
 			mmc_hostname(host), mrq->data->blksz,
 			mrq->data->blocks, mrq->data->flags,
-			mrq->data->timeout_ns / 10000000,
+			mrq->data->timeout_ns / 1000000,
 			mrq->data->timeout_clks);
 	}
 
@@ -130,6 +149,8 @@ mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
 
 	WARN_ON(!host->claimed);
 
+	led_trigger_event(host->led, LED_FULL);
+
 	mrq->cmd->error = 0;
 	mrq->cmd->mrq = mrq;
 	if (mrq->data) {
@@ -199,7 +220,7 @@ int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries
 {
 	struct mmc_request mrq;
 
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
 
@@ -220,16 +241,23 @@ EXPORT_SYMBOL(mmc_wait_for_cmd);
  *	mmc_set_data_timeout - set the timeout for a data command
  *	@data: data phase for command
  *	@card: the MMC card associated with the data transfer
- *	@write: flag to differentiate reads from writes
  *
  *	Computes the data timeout parameters according to the
  *	correct algorithm given the card type.
  */
-void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
-			  int write)
+void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
 {
 	unsigned int mult;
 
+	/*
+	 * SDIO cards only define an upper 1 s limit on access.
+	 */
+	if (mmc_card_sdio(card)) {
+		data->timeout_ns = 1000000000;
+		data->timeout_clks = 0;
+		return;
+	}
+
 	/*
 	 * SD cards use a 100 multiplier rather than 10
 	 */
@@ -239,7 +267,7 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
 	 * Scale up the multiplier (and therefore the timeout) by
 	 * the r2w factor for writes.
 	 */
-	if (write)
+	if (data->flags & MMC_DATA_WRITE)
 		mult <<= card->csd.r2w_factor;
 
 	data->timeout_ns = card->csd.tacc_ns * mult;
@@ -255,7 +283,7 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
 		timeout_us += data->timeout_clks * 1000 /
 			(card->host->ios.clock / 1000);
 
-		if (write)
+		if (data->flags & MMC_DATA_WRITE)
 			limit_us = 250000;
 		else
 			limit_us = 100000;
@@ -272,15 +300,20 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
 EXPORT_SYMBOL(mmc_set_data_timeout);
 
 /**
- *	mmc_claim_host - exclusively claim a host
+ *	__mmc_claim_host - exclusively claim a host
  *	@host: mmc host to claim
+ *	@abort: whether or not the operation should be aborted
  *
- *	Claim a host for a set of operations.
+ *	Claim a host for a set of operations.  If @abort is non null and
+ *	dereference a non-zero value then this will return prematurely with
+ *	that non-zero value without acquiring the lock.  Returns zero
+ *	with the lock held otherwise.
  */
-void mmc_claim_host(struct mmc_host *host)
+int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
 {
 	DECLARE_WAITQUEUE(wait, current);
 	unsigned long flags;
+	int stop;
 
 	might_sleep();
 
@@ -288,19 +321,24 @@ void mmc_claim_host(struct mmc_host *host)
 	spin_lock_irqsave(&host->lock, flags);
 	while (1) {
 		set_current_state(TASK_UNINTERRUPTIBLE);
-		if (!host->claimed)
+		stop = abort ? atomic_read(abort) : 0;
+		if (stop || !host->claimed)
 			break;
 		spin_unlock_irqrestore(&host->lock, flags);
 		schedule();
 		spin_lock_irqsave(&host->lock, flags);
 	}
 	set_current_state(TASK_RUNNING);
+	if (!stop)
 		host->claimed = 1;
+	else
+		wake_up(&host->wq);
 	spin_unlock_irqrestore(&host->lock, flags);
 	remove_wait_queue(&host->wq, &wait);
+	return stop;
 }
 
-EXPORT_SYMBOL(mmc_claim_host);
+EXPORT_SYMBOL(__mmc_claim_host);
 
 /**
  *	mmc_release_host - release a host
@@ -313,7 +351,7 @@ void mmc_release_host(struct mmc_host *host)
 {
 	unsigned long flags;
 
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	spin_lock_irqsave(&host->lock, flags);
 	host->claimed = 0;
@@ -433,19 +471,32 @@ static void mmc_power_up(struct mmc_host *host)
 	int bit = fls(host->ocr_avail) - 1;
 
 	host->ios.vdd = bit;
-	host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+	if (mmc_host_is_spi(host)) {
+		host->ios.chip_select = MMC_CS_HIGH;
+		host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
+	} else {
 		host->ios.chip_select = MMC_CS_DONTCARE;
+		host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+	}
 	host->ios.power_mode = MMC_POWER_UP;
 	host->ios.bus_width = MMC_BUS_WIDTH_1;
 	host->ios.timing = MMC_TIMING_LEGACY;
 	mmc_set_ios(host);
 
-	mmc_delay(1);
+	/*
+	 * This delay should be sufficient to allow the power supply
+	 * to reach the minimum voltage.
+	 */
+	mmc_delay(2);
 
 	host->ios.clock = host->f_min;
 	host->ios.power_mode = MMC_POWER_ON;
 	mmc_set_ios(host);
 
+	/*
+	 * This delay must be at least 74 clock sizes, or 1 ms, or the
+	 * time required to reach a stable voltage.
+	 */
 	mmc_delay(2);
 }
 
@@ -453,8 +504,10 @@ static void mmc_power_off(struct mmc_host *host)
 {
 	host->ios.clock = 0;
 	host->ios.vdd = 0;
+	if (!mmc_host_is_spi(host)) {
 		host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
 		host->ios.chip_select = MMC_CS_DONTCARE;
+	}
 	host->ios.power_mode = MMC_POWER_OFF;
 	host->ios.bus_width = MMC_BUS_WIDTH_1;
 	host->ios.timing = MMC_TIMING_LEGACY;
@@ -511,7 +564,7 @@ void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
 	BUG_ON(!host);
 	BUG_ON(!ops);
 
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	spin_lock_irqsave(&host->lock, flags);
 
@@ -535,8 +588,8 @@ void mmc_detach_bus(struct mmc_host *host)
 
 	BUG_ON(!host);
 
-	BUG_ON(!host->claimed);
-	BUG_ON(!host->bus_ops);
+	WARN_ON(!host->claimed);
+	WARN_ON(!host->bus_ops);
 
 	spin_lock_irqsave(&host->lock, flags);
 
@@ -564,7 +617,7 @@ void mmc_detect_change(struct mmc_host *host, unsigned long delay)
 #ifdef CONFIG_MMC_DEBUG
 	unsigned long flags;
 	spin_lock_irqsave(&host->lock, flags);
-	BUG_ON(host->removed);
+	WARN_ON(host->removed);
 	spin_unlock_irqrestore(&host->lock, flags);
 #endif
 
@@ -597,24 +650,38 @@ void mmc_rescan(struct work_struct *work)
 
 		mmc_send_if_cond(host, host->ocr_avail);
 
+		/*
+		 * First we search for SDIO...
+		 */
+		err = mmc_send_io_op_cond(host, 0, &ocr);
+		if (!err) {
+			if (mmc_attach_sdio(host, ocr))
+				mmc_power_off(host);
+			return;
+		}
+
+		/*
+		 * ...then normal SD...
+		 */
 		err = mmc_send_app_op_cond(host, 0, &ocr);
-		if (err == MMC_ERR_NONE) {
+		if (!err) {
 			if (mmc_attach_sd(host, ocr))
 				mmc_power_off(host);
-		} else {
+			return;
+		}
+
 		/*
-			 * If we fail to detect any SD cards then try
-			 * searching for MMC cards.
+		 * ...and finally MMC.
 		 */
 		err = mmc_send_op_cond(host, 0, &ocr);
-			if (err == MMC_ERR_NONE) {
+		if (!err) {
 			if (mmc_attach_mmc(host, ocr))
 				mmc_power_off(host);
-			} else {
-				mmc_power_off(host);
-				mmc_release_host(host);
-			}
+			return;
 		}
+
+		mmc_release_host(host);
+		mmc_power_off(host);
 	} else {
 		if (host->bus_ops->detect && !host->bus_dead)
 			host->bus_ops->detect(host);
@@ -725,22 +792,38 @@ static int __init mmc_init(void)
 		return -ENOMEM;
 
 	ret = mmc_register_bus();
-	if (ret == 0) {
+	if (ret)
+		goto destroy_workqueue;
+
 	ret = mmc_register_host_class();
 	if (ret)
+		goto unregister_bus;
+
+	ret = sdio_register_bus();
+	if (ret)
+		goto unregister_host_class;
+
+	return 0;
+
+unregister_host_class:
+	mmc_unregister_host_class();
+unregister_bus:
 	mmc_unregister_bus();
-	}
+destroy_workqueue:
+	destroy_workqueue(workqueue);
+
 	return ret;
 }
 
 static void __exit mmc_exit(void)
 {
+	sdio_unregister_bus();
 	mmc_unregister_host_class();
 	mmc_unregister_bus();
 	destroy_workqueue(workqueue);
 }
 
-module_init(mmc_init);
+subsys_initcall(mmc_init);
 module_exit(mmc_exit);
 
 MODULE_LICENSE("GPL");

drivers/mmc/core/core.h

@@ -48,5 +48,7 @@ void mmc_rescan(struct work_struct *work);
 void mmc_start_host(struct mmc_host *host);
 void mmc_stop_host(struct mmc_host *host);
 
+extern int use_spi_crc;
+
 #endif
 

drivers/mmc/core/host.c

@@ -15,6 +15,7 @@
 #include <linux/err.h>
 #include <linux/idr.h>
 #include <linux/pagemap.h>
+#include <linux/leds.h>
 
 #include <linux/mmc/host.h>
 
@@ -100,6 +101,9 @@ int mmc_add_host(struct mmc_host *host)
 {
 	int err;
 
+	WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
+		!host->ops->enable_sdio_irq);
+
 	if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
 		return -ENOMEM;
 
@@ -112,6 +116,8 @@ int mmc_add_host(struct mmc_host *host)
 	snprintf(host->class_dev.bus_id, BUS_ID_SIZE,
 		 "mmc%d", host->index);
 
+	led_trigger_register_simple(host->class_dev.bus_id, &host->led);
+
 	err = device_add(&host->class_dev);
 	if (err)
 		return err;
@@ -137,6 +143,8 @@ void mmc_remove_host(struct mmc_host *host)
 
 	device_del(&host->class_dev);
 
+	led_trigger_unregister(host->led);
+
 	spin_lock(&mmc_host_lock);
 	idr_remove(&mmc_host_idr, host->index);
 	spin_unlock(&mmc_host_lock);

drivers/mmc/core/mmc.c

@@ -161,13 +161,12 @@ static int mmc_read_ext_csd(struct mmc_card *card)
 {
 	int err;
 	u8 *ext_csd;
+	unsigned int ext_csd_struct;
 
 	BUG_ON(!card);
 
-	err = MMC_ERR_FAILED;
-
 	if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
-		return MMC_ERR_NONE;
+		return 0;
 
 	/*
 	 * As the ext_csd is so large and mostly unused, we don't store the
@@ -176,13 +175,19 @@ static int mmc_read_ext_csd(struct mmc_card *card)
 	ext_csd = kmalloc(512, GFP_KERNEL);
 	if (!ext_csd) {
 		printk(KERN_ERR "%s: could not allocate a buffer to "
-			"receive the ext_csd. mmc v4 cards will be "
-			"treated as v3.\n", mmc_hostname(card->host));
-		return MMC_ERR_FAILED;
+			"receive the ext_csd.\n", mmc_hostname(card->host));
+		return -ENOMEM;
 	}
 
 	err = mmc_send_ext_csd(card, ext_csd);
-	if (err != MMC_ERR_NONE) {
+	if (err) {
+		/*
+		 * We all hosts that cannot perform the command
+		 * to fail more gracefully
+		 */
+		if (err != -EINVAL)
+			goto out;
+
 		/*
 		 * High capacity cards should have this "magic" size
 		 * stored in their CSD.
@@ -197,11 +202,21 @@ static int mmc_read_ext_csd(struct mmc_card *card)
 				"EXT_CSD, performance might "
 				"suffer.\n",
 				mmc_hostname(card->host));
-			err = MMC_ERR_NONE;
+			err = 0;
 		}
+
 		goto out;
 	}
 
+	ext_csd_struct = ext_csd[EXT_CSD_REV];
+	if (ext_csd_struct > 2) {
+		printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
+			"version %d\n", mmc_hostname(card->host),
+			ext_csd_struct);
+		return -EINVAL;
+	}
+
+	if (ext_csd_struct >= 2) {
 		card->ext_csd.sectors =
 			ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 			ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
@@ -209,6 +224,7 @@ static int mmc_read_ext_csd(struct mmc_card *card)
 			ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 		if (card->ext_csd.sectors)
 			mmc_card_set_blockaddr(card);
+	}
 
 	switch (ext_csd[EXT_CSD_CARD_TYPE]) {
 	case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
@@ -246,7 +262,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	unsigned int max_dtr;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	/*
 	 * Since we're changing the OCR value, we seem to
@@ -258,19 +274,33 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 
 	/* The extra bit indicates that we support high capacity */
 	err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
-	if (err != MMC_ERR_NONE)
+	if (err)
+		goto err;
+
+	/*
+	 * For SPI, enable CRC as appropriate.
+	 */
+	if (mmc_host_is_spi(host)) {
+		err = mmc_spi_set_crc(host, use_spi_crc);
+		if (err)
 			goto err;
+	}
 
 	/*
 	 * Fetch CID from card.
 	 */
+	if (mmc_host_is_spi(host))
+		err = mmc_send_cid(host, cid);
+	else
 		err = mmc_all_send_cid(host, cid);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		goto err;
 
 	if (oldcard) {
-		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
+		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
+			err = -ENOENT;
 			goto err;
+		}
 
 		card = oldcard;
 	} else {
@@ -278,8 +308,10 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 		 * Allocate card structure.
 		 */
 		card = mmc_alloc_card(host);
-		if (IS_ERR(card))
+		if (IS_ERR(card)) {
+			err = PTR_ERR(card);
 			goto err;
+		}
 
 		card->type = MMC_TYPE_MMC;
 		card->rca = 1;
@@ -287,43 +319,47 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	}
 
 	/*
-	 * Set card RCA.
+	 * For native busses:  set card RCA and quit open drain mode.
 	 */
+	if (!mmc_host_is_spi(host)) {
 		err = mmc_set_relative_addr(card);
-	if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
 
 		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+	}
 
 	if (!oldcard) {
 		/*
 		 * Fetch CSD from card.
 		 */
 		err = mmc_send_csd(card, card->raw_csd);
-		if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
 
 		err = mmc_decode_csd(card);
-		if (err < 0)
+		if (err)
 			goto free_card;
 		err = mmc_decode_cid(card);
-		if (err < 0)
+		if (err)
 			goto free_card;
 	}
 
 	/*
 	 * Select card, as all following commands rely on that.
 	 */
+	if (!mmc_host_is_spi(host)) {
 		err = mmc_select_card(card);
-	if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
+	}
 
 	if (!oldcard) {
 		/*
-		 * Fetch and process extened CSD.
+		 * Fetch and process extended CSD.
 		 */
 		err = mmc_read_ext_csd(card);
-		if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
 	}
 
@@ -334,7 +370,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 		(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 			EXT_CSD_HS_TIMING, 1);
-		if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
 
 		mmc_card_set_highspeed(card);
@@ -363,7 +399,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 		(host->caps & MMC_CAP_4_BIT_DATA)) {
 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 			EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
-		if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
 
 		mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
@@ -372,14 +408,14 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	if (!oldcard)
 		host->card = card;
 
-	return MMC_ERR_NONE;
+	return 0;
 
 free_card:
 	if (!oldcard)
 		mmc_remove_card(card);
 err:
 
-	return MMC_ERR_FAILED;
+	return err;
 }
 
 /*
@@ -413,7 +449,7 @@ static void mmc_detect(struct mmc_host *host)
 
 	mmc_release_host(host);
 
-	if (err != MMC_ERR_NONE) {
+	if (err) {
 		mmc_remove(host);
 
 		mmc_claim_host(host);
@@ -480,6 +516,7 @@ static void mmc_suspend(struct mmc_host *host)
 	BUG_ON(!host->card);
 
 	mmc_claim_host(host);
+	if (!mmc_host_is_spi(host))
 		mmc_deselect_cards(host);
 	host->card->state &= ~MMC_STATE_HIGHSPEED;
 	mmc_release_host(host);
@@ -502,7 +539,7 @@ static void mmc_resume(struct mmc_host *host)
 	err = mmc_init_card(host, host->ocr, host->card);
 	mmc_release_host(host);
 
-	if (err != MMC_ERR_NONE) {
+	if (err) {
 		mmc_remove(host);
 
 		mmc_claim_host(host);
@@ -536,10 +573,19 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
 	int err;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	mmc_attach_bus(host, &mmc_ops);
 
+	/*
+	 * We need to get OCR a different way for SPI.
+	 */
+	if (mmc_host_is_spi(host)) {
+		err = mmc_spi_read_ocr(host, 1, &ocr);
+		if (err)
+			goto err;
+	}
+
 	/*
 	 * Sanity check the voltages that the card claims to
 	 * support.
@@ -565,7 +611,7 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
 	 * Detect and init the card.
 	 */
 	err = mmc_init_card(host, host->ocr, NULL);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		goto err;
 
 	mmc_release_host(host);
@@ -587,6 +633,6 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
 	printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
 		mmc_hostname(host), err);
 
-	return 0;
+	return err;
 }
 

drivers/mmc/core/mmc_ops.c

@@ -40,10 +40,10 @@ static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
 	}
 
 	err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		return err;
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 
 int mmc_select_card(struct mmc_card *card)
@@ -63,23 +63,36 @@ int mmc_go_idle(struct mmc_host *host)
 	int err;
 	struct mmc_command cmd;
 
+	/*
+	 * Non-SPI hosts need to prevent chipselect going active during
+	 * GO_IDLE; that would put chips into SPI mode.  Remind them of
+	 * that in case of hardware that won't pull up DAT3/nCS otherwise.
+	 *
+	 * SPI hosts ignore ios.chip_select; it's managed according to
+	 * rules that must accomodate non-MMC slaves which this layer
+	 * won't even know about.
+	 */
+	if (!mmc_host_is_spi(host)) {
 		mmc_set_chip_select(host, MMC_CS_HIGH);
-
 		mmc_delay(1);
+	}
 
 	memset(&cmd, 0, sizeof(struct mmc_command));
 
 	cmd.opcode = MMC_GO_IDLE_STATE;
 	cmd.arg = 0;
-	cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
 
 	err = mmc_wait_for_cmd(host, &cmd, 0);
 
 	mmc_delay(1);
 
+	if (!mmc_host_is_spi(host)) {
 		mmc_set_chip_select(host, MMC_CS_DONTCARE);
-
 		mmc_delay(1);
+	}
+
+	host->use_spi_crc = 0;
 
 	return err;
 }
@@ -94,23 +107,33 @@ int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 	memset(&cmd, 0, sizeof(struct mmc_command));
 
 	cmd.opcode = MMC_SEND_OP_COND;
-	cmd.arg = ocr;
-	cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
+	cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 
 	for (i = 100; i; i--) {
 		err = mmc_wait_for_cmd(host, &cmd, 0);
-		if (err != MMC_ERR_NONE)
+		if (err)
 			break;
 
-		if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
+		/* if we're just probing, do a single pass */
+		if (ocr == 0)
 			break;
 
-		err = MMC_ERR_TIMEOUT;
+		/* otherwise wait until reset completes */
+		if (mmc_host_is_spi(host)) {
+			if (!(cmd.resp[0] & R1_SPI_IDLE))
+				break;
+		} else {
+			if (cmd.resp[0] & MMC_CARD_BUSY)
+				break;
+		}
+
+		err = -ETIMEDOUT;
 
 		mmc_delay(10);
 	}
 
-	if (rocr)
+	if (rocr && !mmc_host_is_spi(host))
 		*rocr = cmd.resp[0];
 
 	return err;
@@ -131,12 +154,12 @@ int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
 	cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
 
 	err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		return err;
 
 	memcpy(cid, cmd.resp, sizeof(u32) * 4);
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 
 int mmc_set_relative_addr(struct mmc_card *card)
@@ -154,46 +177,52 @@ int mmc_set_relative_addr(struct mmc_card *card)
 	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 
 	err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		return err;
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 
-int mmc_send_csd(struct mmc_card *card, u32 *csd)
+static int
+mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
 {
 	int err;
 	struct mmc_command cmd;
 
-	BUG_ON(!card);
-	BUG_ON(!card->host);
-	BUG_ON(!csd);
+	BUG_ON(!host);
+	BUG_ON(!cxd);
 
 	memset(&cmd, 0, sizeof(struct mmc_command));
 
-	cmd.opcode = MMC_SEND_CSD;
-	cmd.arg = card->rca << 16;
+	cmd.opcode = opcode;
+	cmd.arg = arg;
 	cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
 
-	err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
-	if (err != MMC_ERR_NONE)
+	err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+	if (err)
 		return err;
 
-	memcpy(csd, cmd.resp, sizeof(u32) * 4);
+	memcpy(cxd, cmd.resp, sizeof(u32) * 4);
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 
-int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
+static int
+mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
+		u32 opcode, void *buf, unsigned len)
 {
 	struct mmc_request mrq;
 	struct mmc_command cmd;
 	struct mmc_data data;
 	struct scatterlist sg;
+	void *data_buf;
 
-	BUG_ON(!card);
-	BUG_ON(!card->host);
-	BUG_ON(!ext_csd);
+	/* dma onto stack is unsafe/nonportable, but callers to this
+	 * routine normally provide temporary on-stack buffers ...
+	 */
+	data_buf = kmalloc(len, GFP_KERNEL);
+	if (data_buf == NULL)
+		return -ENOMEM;
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
 	memset(&cmd, 0, sizeof(struct mmc_command));
@@ -202,28 +231,99 @@ int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
 	mrq.cmd = &cmd;
 	mrq.data = &data;
 
-	cmd.opcode = MMC_SEND_EXT_CSD;
+	cmd.opcode = opcode;
 	cmd.arg = 0;
-	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
 
-	data.blksz = 512;
+	/* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
+	 * rely on callers to never use this with "native" calls for reading
+	 * CSD or CID.  Native versions of those commands use the R2 type,
+	 * not R1 plus a data block.
+	 */
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+
+	data.blksz = len;
 	data.blocks = 1;
 	data.flags = MMC_DATA_READ;
 	data.sg = &sg;
 	data.sg_len = 1;
 
-	sg_init_one(&sg, ext_csd, 512);
+	sg_init_one(&sg, data_buf, len);
 
-	mmc_set_data_timeout(&data, card, 0);
+	if (card)
+		mmc_set_data_timeout(&data, card);
 
-	mmc_wait_for_req(card->host, &mrq);
+	mmc_wait_for_req(host, &mrq);
 
-	if (cmd.error != MMC_ERR_NONE)
+	memcpy(buf, data_buf, len);
+	kfree(data_buf);
+
+	if (cmd.error)
 		return cmd.error;
-	if (data.error != MMC_ERR_NONE)
+	if (data.error)
 		return data.error;
 
-	return MMC_ERR_NONE;
+	return 0;
+}
+
+int mmc_send_csd(struct mmc_card *card, u32 *csd)
+{
+	if (!mmc_host_is_spi(card->host))
+		return mmc_send_cxd_native(card->host, card->rca << 16,
+				csd, MMC_SEND_CSD);
+
+	return mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
+}
+
+int mmc_send_cid(struct mmc_host *host, u32 *cid)
+{
+	if (!mmc_host_is_spi(host)) {
+		if (!host->card)
+			return -EINVAL;
+		return mmc_send_cxd_native(host, host->card->rca << 16,
+				cid, MMC_SEND_CID);
+	}
+
+	return mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
+}
+
+int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
+{
+	return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
+			ext_csd, 512);
+}
+
+int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
+{
+	struct mmc_command cmd;
+	int err;
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = MMC_SPI_READ_OCR;
+	cmd.arg = highcap ? (1 << 30) : 0;
+	cmd.flags = MMC_RSP_SPI_R3;
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+
+	*ocrp = cmd.resp[1];
+	return err;
+}
+
+int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
+{
+	struct mmc_command cmd;
+	int err;
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = MMC_SPI_CRC_ON_OFF;
+	cmd.flags = MMC_RSP_SPI_R1;
+	cmd.arg = use_crc;
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (!err)
+		host->use_spi_crc = use_crc;
+	return err;
 }
 
 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
@@ -241,13 +341,13 @@ int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
 		  (index << 16) |
 		  (value << 8) |
 		  set;
-	cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
+	cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 
 	err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		return err;
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 
 int mmc_send_status(struct mmc_card *card, u32 *status)
@@ -261,16 +361,20 @@ int mmc_send_status(struct mmc_card *card, u32 *status)
 	memset(&cmd, 0, sizeof(struct mmc_command));
 
 	cmd.opcode = MMC_SEND_STATUS;
+	if (!mmc_host_is_spi(card->host))
 		cmd.arg = card->rca << 16;
-	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+	cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 
 	err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		return err;
 
+	/* NOTE: callers are required to understand the difference
+	 * between "native" and SPI format status words!
+	 */
 	if (status)
 		*status = cmd.resp[0];
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 

drivers/mmc/core/mmc_ops.h

@@ -22,6 +22,9 @@ int mmc_send_csd(struct mmc_card *card, u32 *csd);
 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd);
 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value);
 int mmc_send_status(struct mmc_card *card, u32 *status);
+int mmc_send_cid(struct mmc_host *host, u32 *cid);
+int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp);
+int mmc_spi_set_crc(struct mmc_host *host, int use_crc);
 
 #endif
 

drivers/mmc/core/sd.c

@@ -166,8 +166,6 @@ static int mmc_decode_scr(struct mmc_card *card)
 	unsigned int scr_struct;
 	u32 resp[4];
 
-	BUG_ON(!mmc_card_sd(card));
-
 	resp[3] = card->raw_scr[1];
 	resp[2] = card->raw_scr[0];
 
@@ -193,30 +191,38 @@ static int mmc_read_switch(struct mmc_card *card)
 	u8 *status;
 
 	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
-		return MMC_ERR_NONE;
+		return 0;
 
 	if (!(card->csd.cmdclass & CCC_SWITCH)) {
 		printk(KERN_WARNING "%s: card lacks mandatory switch "
 			"function, performance might suffer.\n",
 			mmc_hostname(card->host));
-		return MMC_ERR_NONE;
+		return 0;
 	}
 
-	err = MMC_ERR_FAILED;
+	err = -EIO;
 
 	status = kmalloc(64, GFP_KERNEL);
 	if (!status) {
 		printk(KERN_ERR "%s: could not allocate a buffer for "
 			"switch capabilities.\n", mmc_hostname(card->host));
-		return err;
+		return -ENOMEM;
 	}
 
 	err = mmc_sd_switch(card, 0, 0, 1, status);
-	if (err != MMC_ERR_NONE) {
+	if (err) {
+		/*
+		 * We all hosts that cannot perform the command
+		 * to fail more gracefully
+		 */
+		if (err != -EINVAL)
+			goto out;
+
 		printk(KERN_WARNING "%s: problem reading switch "
 			"capabilities, performance might suffer.\n",
 			mmc_hostname(card->host));
-		err = MMC_ERR_NONE;
+		err = 0;
+
 		goto out;
 	}
 
@@ -238,28 +244,28 @@ static int mmc_switch_hs(struct mmc_card *card)
 	u8 *status;
 
 	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
-		return MMC_ERR_NONE;
+		return 0;
 
 	if (!(card->csd.cmdclass & CCC_SWITCH))
-		return MMC_ERR_NONE;
+		return 0;
 
 	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
-		return MMC_ERR_NONE;
+		return 0;
 
 	if (card->sw_caps.hs_max_dtr == 0)
-		return MMC_ERR_NONE;
+		return 0;
 
-	err = MMC_ERR_FAILED;
+	err = -EIO;
 
 	status = kmalloc(64, GFP_KERNEL);
 	if (!status) {
 		printk(KERN_ERR "%s: could not allocate a buffer for "
 			"switch capabilities.\n", mmc_hostname(card->host));
-		return err;
+		return -ENOMEM;
 	}
 
 	err = mmc_sd_switch(card, 1, 0, 1, status);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		goto out;
 
 	if ((status[16] & 0xF) != 1) {
@@ -292,7 +298,7 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 	unsigned int max_dtr;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	/*
 	 * Since we're changing the OCR value, we seem to
@@ -309,23 +315,37 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 	 * block-addressed SDHC cards.
 	 */
 	err = mmc_send_if_cond(host, ocr);
-	if (err == MMC_ERR_NONE)
+	if (!err)
 		ocr |= 1 << 30;
 
 	err = mmc_send_app_op_cond(host, ocr, NULL);
-	if (err != MMC_ERR_NONE)
+	if (err)
+		goto err;
+
+	/*
+	 * For SPI, enable CRC as appropriate.
+	 */
+	if (mmc_host_is_spi(host)) {
+		err = mmc_spi_set_crc(host, use_spi_crc);
+		if (err)
 			goto err;
+	}
 
 	/*
 	 * Fetch CID from card.
 	 */
+	if (mmc_host_is_spi(host))
+		err = mmc_send_cid(host, cid);
+	else
 		err = mmc_all_send_cid(host, cid);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		goto err;
 
 	if (oldcard) {
-		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
+		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
+			err = -ENOENT;
 			goto err;
+		}
 
 		card = oldcard;
 	} else {
@@ -333,32 +353,36 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 		 * Allocate card structure.
 		 */
 		card = mmc_alloc_card(host);
-		if (IS_ERR(card))
+		if (IS_ERR(card)) {
+			err = PTR_ERR(card);
 			goto err;
+		}
 
 		card->type = MMC_TYPE_SD;
 		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 	}
 
 	/*
-	 * Set card RCA.
+	 * For native busses:  get card RCA and quit open drain mode.
 	 */
+	if (!mmc_host_is_spi(host)) {
 		err = mmc_send_relative_addr(host, &card->rca);
-	if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
 
 		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+	}
 
 	if (!oldcard) {
 		/*
 		 * Fetch CSD from card.
 		 */
 		err = mmc_send_csd(card, card->raw_csd);
-		if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
 
 		err = mmc_decode_csd(card);
-		if (err < 0)
+		if (err)
 			goto free_card;
 
 		mmc_decode_cid(card);
@@ -367,16 +391,18 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 	/*
 	 * Select card, as all following commands rely on that.
 	 */
+	if (!mmc_host_is_spi(host)) {
 		err = mmc_select_card(card);
-	if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
+	}
 
 	if (!oldcard) {
 		/*
 		 * Fetch SCR from card.
 		 */
 		err = mmc_app_send_scr(card, card->raw_scr);
-		if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
 
 		err = mmc_decode_scr(card);
@@ -387,7 +413,7 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 		 * Fetch switch information from card.
 		 */
 		err = mmc_read_switch(card);
-		if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
 	}
 
@@ -395,7 +421,7 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 	 * Attempt to change to high-speed (if supported)
 	 */
 	err = mmc_switch_hs(card);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		goto free_card;
 
 	/*
@@ -418,7 +444,7 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 	if ((host->caps & MMC_CAP_4_BIT_DATA) &&
 		(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
 		err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
-		if (err != MMC_ERR_NONE)
+		if (err)
 			goto free_card;
 
 		mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
@@ -442,14 +468,14 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 	if (!oldcard)
 		host->card = card;
 
-	return MMC_ERR_NONE;
+	return 0;
 
 free_card:
 	if (!oldcard)
 		mmc_remove_card(card);
 err:
 
-	return MMC_ERR_FAILED;
+	return err;
 }
 
 /*
@@ -483,7 +509,7 @@ static void mmc_sd_detect(struct mmc_host *host)
 
 	mmc_release_host(host);
 
-	if (err != MMC_ERR_NONE) {
+	if (err) {
 		mmc_sd_remove(host);
 
 		mmc_claim_host(host);
@@ -552,6 +578,7 @@ static void mmc_sd_suspend(struct mmc_host *host)
 	BUG_ON(!host->card);
 
 	mmc_claim_host(host);
+	if (!mmc_host_is_spi(host))
 		mmc_deselect_cards(host);
 	host->card->state &= ~MMC_STATE_HIGHSPEED;
 	mmc_release_host(host);
@@ -574,7 +601,7 @@ static void mmc_sd_resume(struct mmc_host *host)
 	err = mmc_sd_init_card(host, host->ocr, host->card);
 	mmc_release_host(host);
 
-	if (err != MMC_ERR_NONE) {
+	if (err) {
 		mmc_sd_remove(host);
 
 		mmc_claim_host(host);
@@ -608,10 +635,21 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 	int err;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	mmc_attach_bus(host, &mmc_sd_ops);
 
+	/*
+	 * We need to get OCR a different way for SPI.
+	 */
+	if (mmc_host_is_spi(host)) {
+		mmc_go_idle(host);
+
+		err = mmc_spi_read_ocr(host, 0, &ocr);
+		if (err)
+			goto err;
+	}
+
 	/*
 	 * Sanity check the voltages that the card claims to
 	 * support.
@@ -644,7 +682,7 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 	 * Detect and init the card.
 	 */
 	err = mmc_sd_init_card(host, host->ocr, NULL);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		goto err;
 
 	mmc_release_host(host);
@@ -666,6 +704,6 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 	printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
 		mmc_hostname(host), err);
 
-	return 0;
+	return err;
 }
 

drivers/mmc/core/sd_ops.c

@@ -33,21 +33,21 @@ static int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
 
 	if (card) {
 		cmd.arg = card->rca << 16;
-		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+		cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 	} else {
 		cmd.arg = 0;
-		cmd.flags = MMC_RSP_R1 | MMC_CMD_BCR;
+		cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
 	}
 
 	err = mmc_wait_for_cmd(host, &cmd, 0);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		return err;
 
 	/* Check that card supported application commands */
-	if (!(cmd.resp[0] & R1_APP_CMD))
-		return MMC_ERR_FAILED;
+	if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
+		return -EOPNOTSUPP;
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 
 /**
@@ -73,7 +73,7 @@ int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
 	BUG_ON(!cmd);
 	BUG_ON(retries < 0);
 
-	err = MMC_ERR_INVALID;
+	err = -EIO;
 
 	/*
 	 * We have to resend MMC_APP_CMD for each attempt so
@@ -83,8 +83,14 @@ int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
 		memset(&mrq, 0, sizeof(struct mmc_request));
 
 		err = mmc_app_cmd(host, card);
-		if (err != MMC_ERR_NONE)
+		if (err) {
+			/* no point in retrying; no APP commands allowed */
+			if (mmc_host_is_spi(host)) {
+				if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
+					break;
+			}
 			continue;
+		}
 
 		memset(&mrq, 0, sizeof(struct mmc_request));
 
@@ -97,9 +103,15 @@ int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
 		mmc_wait_for_req(host, &mrq);
 
 		err = cmd->error;
-		if (cmd->error == MMC_ERR_NONE)
+		if (!cmd->error)
+			break;
+
+		/* no point in retrying illegal APP commands */
+		if (mmc_host_is_spi(host)) {
+			if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
 				break;
 		}
+	}
 
 	return err;
 }
@@ -127,14 +139,14 @@ int mmc_app_set_bus_width(struct mmc_card *card, int width)
 		cmd.arg = SD_BUS_WIDTH_4;
 		break;
 	default:
-		return MMC_ERR_INVALID;
+		return -EINVAL;
 	}
 
 	err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		return err;
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 
 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
@@ -147,23 +159,36 @@ int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 	memset(&cmd, 0, sizeof(struct mmc_command));
 
 	cmd.opcode = SD_APP_OP_COND;
+	if (mmc_host_is_spi(host))
+		cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
+	else
 		cmd.arg = ocr;
-	cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 
 	for (i = 100; i; i--) {
 		err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
-		if (err != MMC_ERR_NONE)
+		if (err)
 			break;
 
-		if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
+		/* if we're just probing, do a single pass */
+		if (ocr == 0)
 			break;
 
-		err = MMC_ERR_TIMEOUT;
+		/* otherwise wait until reset completes */
+		if (mmc_host_is_spi(host)) {
+			if (!(cmd.resp[0] & R1_SPI_IDLE))
+				break;
+		} else {
+			if (cmd.resp[0] & MMC_CARD_BUSY)
+				break;
+		}
+
+		err = -ETIMEDOUT;
 
 		mmc_delay(10);
 	}
 
-	if (rocr)
+	if (rocr && !mmc_host_is_spi(host))
 		*rocr = cmd.resp[0];
 
 	return err;
@@ -174,6 +199,7 @@ int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 	struct mmc_command cmd;
 	int err;
 	static const u8 test_pattern = 0xAA;
+	u8 result_pattern;
 
 	/*
 	 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
@@ -182,16 +208,21 @@ int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 	 */
 	cmd.opcode = SD_SEND_IF_COND;
 	cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
-	cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
+	cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
 
 	err = mmc_wait_for_cmd(host, &cmd, 0);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		return err;
 
-	if ((cmd.resp[0] & 0xFF) != test_pattern)
-		return MMC_ERR_FAILED;
+	if (mmc_host_is_spi(host))
+		result_pattern = cmd.resp[1] & 0xFF;
+	else
+		result_pattern = cmd.resp[0] & 0xFF;
 
-	return MMC_ERR_NONE;
+	if (result_pattern != test_pattern)
+		return -EIO;
+
+	return 0;
 }
 
 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
@@ -209,12 +240,12 @@ int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
 	cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
 
 	err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		return err;
 
 	*rca = cmd.resp[0] >> 16;
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 
 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
@@ -229,8 +260,10 @@ int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 	BUG_ON(!card->host);
 	BUG_ON(!scr);
 
+	/* NOTE: caller guarantees scr is heap-allocated */
+
 	err = mmc_app_cmd(card->host, card);
-	if (err != MMC_ERR_NONE)
+	if (err)
 		return err;
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
@@ -242,7 +275,7 @@ int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 
 	cmd.opcode = SD_APP_SEND_SCR;
 	cmd.arg = 0;
-	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 
 	data.blksz = 8;
 	data.blocks = 1;
@@ -252,19 +285,19 @@ int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 
 	sg_init_one(&sg, scr, 8);
 
-	mmc_set_data_timeout(&data, card, 0);
+	mmc_set_data_timeout(&data, card);
 
 	mmc_wait_for_req(card->host, &mrq);
 
-	if (cmd.error != MMC_ERR_NONE)
+	if (cmd.error)
 		return cmd.error;
-	if (data.error != MMC_ERR_NONE)
+	if (data.error)
 		return data.error;
 
 	scr[0] = ntohl(scr[0]);
 	scr[1] = ntohl(scr[1]);
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 
 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
@@ -278,6 +311,8 @@ int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 	BUG_ON(!card);
 	BUG_ON(!card->host);
 
+	/* NOTE: caller guarantees resp is heap-allocated */
+
 	mode = !!mode;
 	value &= 0xF;
 
@@ -292,7 +327,7 @@ int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 	cmd.arg = mode << 31 | 0x00FFFFFF;
 	cmd.arg &= ~(0xF << (group * 4));
 	cmd.arg |= value << (group * 4);
-	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 
 	data.blksz = 64;
 	data.blocks = 1;
@@ -302,15 +337,15 @@ int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 
 	sg_init_one(&sg, resp, 64);
 
-	mmc_set_data_timeout(&data, card, 0);
+	mmc_set_data_timeout(&data, card);
 
 	mmc_wait_for_req(card->host, &mrq);
 
-	if (cmd.error != MMC_ERR_NONE)
+	if (cmd.error)
 		return cmd.error;
-	if (data.error != MMC_ERR_NONE)
+	if (data.error)
 		return data.error;
 
-	return MMC_ERR_NONE;
+	return 0;
 }
 

drivers/mmc/core/sdio.c

+/*
+ *  linux/drivers/mmc/sdio.c
+ *
+ *  Copyright 2006-2007 Pierre Ossman
+ *
+ * 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.
+ */
+
+#include <linux/err.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "core.h"
+#include "bus.h"
+#include "sdio_bus.h"
+#include "mmc_ops.h"
+#include "sd_ops.h"
+#include "sdio_ops.h"
+#include "sdio_cis.h"
+
+static int sdio_read_fbr(struct sdio_func *func)
+{
+	int ret;
+	unsigned char data;
+
+	ret = mmc_io_rw_direct(func->card, 0, 0,
+		SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
+	if (ret)
+		goto out;
+
+	data &= 0x0f;
+
+	if (data == 0x0f) {
+		ret = mmc_io_rw_direct(func->card, 0, 0,
+			SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
+		if (ret)
+			goto out;
+	}
+
+	func->class = data;
+
+out:
+	return ret;
+}
+
+static int sdio_init_func(struct mmc_card *card, unsigned int fn)
+{
+	int ret;
+	struct sdio_func *func;
+
+	BUG_ON(fn > SDIO_MAX_FUNCS);
+
+	func = sdio_alloc_func(card);
+	if (IS_ERR(func))
+		return PTR_ERR(func);
+
+	func->num = fn;
+
+	ret = sdio_read_fbr(func);
+	if (ret)
+		goto fail;
+
+	ret = sdio_read_func_cis(func);
+	if (ret)
+		goto fail;
+
+	card->sdio_func[fn - 1] = func;
+
+	return 0;
+
+fail:
+	/*
+	 * It is okay to remove the function here even though we hold
+	 * the host lock as we haven't registered the device yet.
+	 */
+	sdio_remove_func(func);
+	return ret;
+}
+
+static int sdio_read_cccr(struct mmc_card *card)
+{
+	int ret;
+	int cccr_vsn;
+	unsigned char data;
+
+	memset(&card->cccr, 0, sizeof(struct sdio_cccr));
+
+	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
+	if (ret)
+		goto out;
+
+	cccr_vsn = data & 0x0f;
+
+	if (cccr_vsn > SDIO_CCCR_REV_1_20) {
+		printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
+			mmc_hostname(card->host), cccr_vsn);
+		return -EINVAL;
+	}
+
+	card->cccr.sdio_vsn = (data & 0xf0) >> 4;
+
+	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
+	if (ret)
+		goto out;
+
+	if (data & SDIO_CCCR_CAP_SMB)
+		card->cccr.multi_block = 1;
+	if (data & SDIO_CCCR_CAP_LSC)
+		card->cccr.low_speed = 1;
+	if (data & SDIO_CCCR_CAP_4BLS)
+		card->cccr.wide_bus = 1;
+
+	if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
+		ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
+		if (ret)
+			goto out;
+
+		if (data & SDIO_POWER_SMPC)
+			card->cccr.high_power = 1;
+	}
+
+	if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
+		ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
+		if (ret)
+			goto out;
+
+		if (data & SDIO_SPEED_SHS)
+			card->cccr.high_speed = 1;
+	}
+
+out:
+	return ret;
+}
+
+static int sdio_enable_wide(struct mmc_card *card)
+{
+	int ret;
+	u8 ctrl;
+
+	if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
+		return 0;
+
+	if (card->cccr.low_speed && !card->cccr.wide_bus)
+		return 0;
+
+	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
+	if (ret)
+		return ret;
+
+	ctrl |= SDIO_BUS_WIDTH_4BIT;
+
+	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
+	if (ret)
+		return ret;
+
+	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
+
+	return 0;
+}
+
+/*
+ * Host is being removed. Free up the current card.
+ */
+static void mmc_sdio_remove(struct mmc_host *host)
+{
+	int i;
+
+	BUG_ON(!host);
+	BUG_ON(!host->card);
+
+	for (i = 0;i < host->card->sdio_funcs;i++) {
+		if (host->card->sdio_func[i]) {
+			sdio_remove_func(host->card->sdio_func[i]);
+			host->card->sdio_func[i] = NULL;
+		}
+	}
+
+	mmc_remove_card(host->card);
+	host->card = NULL;
+}
+
+/*
+ * Card detection callback from host.
+ */
+static void mmc_sdio_detect(struct mmc_host *host)
+{
+	int err;
+
+	BUG_ON(!host);
+	BUG_ON(!host->card);
+
+	mmc_claim_host(host);
+
+	/*
+	 * Just check if our card has been removed.
+	 */
+	err = mmc_select_card(host->card);
+
+	mmc_release_host(host);
+
+	if (err) {
+		mmc_sdio_remove(host);
+
+		mmc_claim_host(host);
+		mmc_detach_bus(host);
+		mmc_release_host(host);
+	}
+}
+
+
+static const struct mmc_bus_ops mmc_sdio_ops = {
+	.remove = mmc_sdio_remove,
+	.detect = mmc_sdio_detect,
+};
+
+
+/*
+ * Starting point for SDIO card init.
+ */
+int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
+{
+	int err;
+	int i, funcs;
+	struct mmc_card *card;
+
+	BUG_ON(!host);
+	WARN_ON(!host->claimed);
+
+	mmc_attach_bus(host, &mmc_sdio_ops);
+
+	/*
+	 * Sanity check the voltages that the card claims to
+	 * support.
+	 */
+	if (ocr & 0x7F) {
+		printk(KERN_WARNING "%s: card claims to support voltages "
+		       "below the defined range. These will be ignored.\n",
+		       mmc_hostname(host));
+		ocr &= ~0x7F;
+	}
+
+	if (ocr & MMC_VDD_165_195) {
+		printk(KERN_WARNING "%s: SDIO card claims to support the "
+		       "incompletely defined 'low voltage range'. This "
+		       "will be ignored.\n", mmc_hostname(host));
+		ocr &= ~MMC_VDD_165_195;
+	}
+
+	host->ocr = mmc_select_voltage(host, ocr);
+
+	/*
+	 * Can we support the voltage(s) of the card(s)?
+	 */
+	if (!host->ocr) {
+		err = -EINVAL;
+		goto err;
+	}
+
+	/*
+	 * Inform the card of the voltage
+	 */
+	err = mmc_send_io_op_cond(host, host->ocr, &ocr);
+	if (err)
+		goto err;
+
+	/*
+	 * For SPI, enable CRC as appropriate.
+	 */
+	if (mmc_host_is_spi(host)) {
+		err = mmc_spi_set_crc(host, use_spi_crc);
+		if (err)
+			goto err;
+	}
+
+	/*
+	 * The number of functions on the card is encoded inside
+	 * the ocr.
+	 */
+	funcs = (ocr & 0x70000000) >> 28;
+
+	/*
+	 * Allocate card structure.
+	 */
+	card = mmc_alloc_card(host);
+	if (IS_ERR(card)) {
+		err = PTR_ERR(card);
+		goto err;
+	}
+
+	card->type = MMC_TYPE_SDIO;
+	card->sdio_funcs = funcs;
+
+	host->card = card;
+
+	/*
+	 * For native busses:  set card RCA and quit open drain mode.
+	 */
+	if (!mmc_host_is_spi(host)) {
+		err = mmc_send_relative_addr(host, &card->rca);
+		if (err)
+			goto remove;
+
+		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+	}
+
+	/*
+	 * Select card, as all following commands rely on that.
+	 */
+	if (!mmc_host_is_spi(host)) {
+		err = mmc_select_card(card);
+		if (err)
+			goto remove;
+	}
+
+	/*
+	 * Read the common registers.
+	 */
+	err = sdio_read_cccr(card);
+	if (err)
+		goto remove;
+
+	/*
+	 * Read the common CIS tuples.
+	 */
+	err = sdio_read_common_cis(card);
+	if (err)
+		goto remove;
+
+	/*
+	 * No support for high-speed yet, so just set
+	 * the card's maximum speed.
+	 */
+	mmc_set_clock(host, card->cis.max_dtr);
+
+	/*
+	 * Switch to wider bus (if supported).
+	 */
+	err = sdio_enable_wide(card);
+	if (err)
+		goto remove;
+
+	/*
+	 * Initialize (but don't add) all present functions.
+	 */
+	for (i = 0;i < funcs;i++) {
+		err = sdio_init_func(host->card, i + 1);
+		if (err)
+			goto remove;
+	}
+
+	mmc_release_host(host);
+
+	/*
+	 * First add the card to the driver model...
+	 */
+	err = mmc_add_card(host->card);
+	if (err)
+		goto remove_added;
+
+	/*
+	 * ...then the SDIO functions.
+	 */
+	for (i = 0;i < funcs;i++) {
+		err = sdio_add_func(host->card->sdio_func[i]);
+		if (err)
+			goto remove_added;
+	}
+
+	return 0;
+
+
+remove_added:
+	/* Remove without lock if the device has been added. */
+	mmc_sdio_remove(host);
+	mmc_claim_host(host);
+remove:
+	/* And with lock if it hasn't been added. */
+	if (host->card)
+		mmc_sdio_remove(host);
+err:
+	mmc_detach_bus(host);
+	mmc_release_host(host);
+
+	printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
+		mmc_hostname(host), err);
+
+	return err;
+}
+

drivers/mmc/core/sdio_bus.c

+/*
+ *  linux/drivers/mmc/core/sdio_bus.c
+ *
+ *  Copyright 2007 Pierre Ossman
+ *
+ * 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.
+ *
+ * SDIO function driver model
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "sdio_cis.h"
+#include "sdio_bus.h"
+
+#define dev_to_sdio_func(d)	container_of(d, struct sdio_func, dev)
+#define to_sdio_driver(d)      container_of(d, struct sdio_driver, drv)
+
+/* show configuration fields */
+#define sdio_config_attr(field, format_string)				\
+static ssize_t								\
+field##_show(struct device *dev, struct device_attribute *attr, char *buf)				\
+{									\
+	struct sdio_func *func;						\
+									\
+	func = dev_to_sdio_func (dev);					\
+	return sprintf (buf, format_string, func->field);		\
+}
+
+sdio_config_attr(class, "0x%02x\n");
+sdio_config_attr(vendor, "0x%04x\n");
+sdio_config_attr(device, "0x%04x\n");
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct sdio_func *func = dev_to_sdio_func (dev);
+
+	return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
+			func->class, func->vendor, func->device);
+}
+
+static struct device_attribute sdio_dev_attrs[] = {
+	__ATTR_RO(class),
+	__ATTR_RO(vendor),
+	__ATTR_RO(device),
+	__ATTR_RO(modalias),
+	__ATTR_NULL,
+};
+
+static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
+	const struct sdio_device_id *id)
+{
+	if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
+		return NULL;
+	if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
+		return NULL;
+	if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
+		return NULL;
+	return id;
+}
+
+static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
+	struct sdio_driver *sdrv)
+{
+	const struct sdio_device_id *ids;
+
+	ids = sdrv->id_table;
+
+	if (ids) {
+		while (ids->class || ids->vendor || ids->device) {
+			if (sdio_match_one(func, ids))
+				return ids;
+			ids++;
+		}
+	}
+
+	return NULL;
+}
+
+static int sdio_bus_match(struct device *dev, struct device_driver *drv)
+{
+	struct sdio_func *func = dev_to_sdio_func(dev);
+	struct sdio_driver *sdrv = to_sdio_driver(drv);
+
+	if (sdio_match_device(func, sdrv))
+		return 1;
+
+	return 0;
+}
+
+static int
+sdio_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
+		int buf_size)
+{
+	struct sdio_func *func = dev_to_sdio_func(dev);
+	int i = 0, length = 0;
+
+	if (add_uevent_var(envp, num_envp, &i,
+			buf, buf_size, &length,
+			"SDIO_CLASS=%02X", func->class))
+		return -ENOMEM;
+
+	if (add_uevent_var(envp, num_envp, &i,
+			buf, buf_size, &length,
+			"SDIO_ID=%04X:%04X", func->vendor, func->device))
+		return -ENOMEM;
+
+	if (add_uevent_var(envp, num_envp, &i,
+			buf, buf_size, &length,
+			"MODALIAS=sdio:c%02Xv%04Xd%04X",
+			func->class, func->vendor, func->device))
+		return -ENOMEM;
+
+	envp[i] = NULL;
+
+	return 0;
+}
+
+static int sdio_bus_probe(struct device *dev)
+{
+	struct sdio_driver *drv = to_sdio_driver(dev->driver);
+	struct sdio_func *func = dev_to_sdio_func(dev);
+	const struct sdio_device_id *id;
+	int ret;
+
+	id = sdio_match_device(func, drv);
+	if (!id)
+		return -ENODEV;
+
+	/* Set the default block size so the driver is sure it's something
+	 * sensible. */
+	sdio_claim_host(func);
+	ret = sdio_set_block_size(func, 0);
+	sdio_release_host(func);
+	if (ret)
+		return ret;
+
+	return drv->probe(func, id);
+}
+
+static int sdio_bus_remove(struct device *dev)
+{
+	struct sdio_driver *drv = to_sdio_driver(dev->driver);
+	struct sdio_func *func = dev_to_sdio_func(dev);
+
+	drv->remove(func);
+
+	if (func->irq_handler) {
+		printk(KERN_WARNING "WARNING: driver %s did not remove "
+			"its interrupt handler!\n", drv->name);
+		sdio_claim_host(func);
+		sdio_release_irq(func);
+		sdio_release_host(func);
+	}
+
+	return 0;
+}
+
+static struct bus_type sdio_bus_type = {
+	.name		= "sdio",
+	.dev_attrs	= sdio_dev_attrs,
+	.match		= sdio_bus_match,
+	.uevent		= sdio_bus_uevent,
+	.probe		= sdio_bus_probe,
+	.remove		= sdio_bus_remove,
+};
+
+int sdio_register_bus(void)
+{
+	return bus_register(&sdio_bus_type);
+}
+
+void sdio_unregister_bus(void)
+{
+	bus_unregister(&sdio_bus_type);
+}
+
+/**
+ *	sdio_register_driver - register a function driver
+ *	@drv: SDIO function driver
+ */
+int sdio_register_driver(struct sdio_driver *drv)
+{
+	drv->drv.name = drv->name;
+	drv->drv.bus = &sdio_bus_type;
+	return driver_register(&drv->drv);
+}
+EXPORT_SYMBOL_GPL(sdio_register_driver);
+
+/**
+ *	sdio_unregister_driver - unregister a function driver
+ *	@drv: SDIO function driver
+ */
+void sdio_unregister_driver(struct sdio_driver *drv)
+{
+	drv->drv.bus = &sdio_bus_type;
+	driver_unregister(&drv->drv);
+}
+EXPORT_SYMBOL_GPL(sdio_unregister_driver);
+
+static void sdio_release_func(struct device *dev)
+{
+	struct sdio_func *func = dev_to_sdio_func(dev);
+
+	sdio_free_func_cis(func);
+
+	if (func->info)
+		kfree(func->info);
+
+	kfree(func);
+}
+
+/*
+ * Allocate and initialise a new SDIO function structure.
+ */
+struct sdio_func *sdio_alloc_func(struct mmc_card *card)
+{
+	struct sdio_func *func;
+
+	func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
+	if (!func)
+		return ERR_PTR(-ENOMEM);
+
+	func->card = card;
+
+	device_initialize(&func->dev);
+
+	func->dev.parent = &card->dev;
+	func->dev.bus = &sdio_bus_type;
+	func->dev.release = sdio_release_func;
+
+	return func;
+}
+
+/*
+ * Register a new SDIO function with the driver model.
+ */
+int sdio_add_func(struct sdio_func *func)
+{
+	int ret;
+
+	snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
+		 "%s:%d", mmc_card_id(func->card), func->num);
+
+	ret = device_add(&func->dev);
+	if (ret == 0)
+		sdio_func_set_present(func);
+
+	return ret;
+}
+
+/*
+ * Unregister a SDIO function with the driver model, and
+ * (eventually) free it.
+ */
+void sdio_remove_func(struct sdio_func *func)
+{
+	if (sdio_func_present(func))
+		device_del(&func->dev);
+
+	put_device(&func->dev);
+}
+

drivers/mmc/core/sdio_bus.h

+/*
+ *  linux/drivers/mmc/core/sdio_bus.h
+ *
+ *  Copyright 2007 Pierre Ossman
+ *
+ * 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.
+ */
+#ifndef _MMC_CORE_SDIO_BUS_H
+#define _MMC_CORE_SDIO_BUS_H
+
+struct sdio_func *sdio_alloc_func(struct mmc_card *card);
+int sdio_add_func(struct sdio_func *func);
+void sdio_remove_func(struct sdio_func *func);
+
+int sdio_register_bus(void);
+void sdio_unregister_bus(void);
+
+#endif
+

drivers/mmc/core/sdio_cis.c

+/*
+ * linux/drivers/mmc/core/sdio_cis.c
+ *
+ * Author:	Nicolas Pitre
+ * Created:	June 11, 2007
+ * Copyright:	MontaVista Software Inc.
+ *
+ * Copyright 2007 Pierre Ossman
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "sdio_cis.h"
+#include "sdio_ops.h"
+
+static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
+			 const unsigned char *buf, unsigned size)
+{
+	unsigned i, nr_strings;
+	char **buffer, *string;
+
+	buf += 2;
+	size -= 2;
+
+	nr_strings = 0;
+	for (i = 0; i < size; i++) {
+		if (buf[i] == 0xff)
+			break;
+		if (buf[i] == 0)
+			nr_strings++;
+	}
+
+	if (buf[i-1] != '\0') {
+		printk(KERN_WARNING "SDIO: ignoring broken CISTPL_VERS_1\n");
+		return 0;
+	}
+
+	size = i;
+
+	buffer = kzalloc(sizeof(char*) * nr_strings + size, GFP_KERNEL);
+	if (!buffer)
+		return -ENOMEM;
+
+	string = (char*)(buffer + nr_strings);
+
+	for (i = 0; i < nr_strings; i++) {
+		buffer[i] = string;
+		strcpy(string, buf);
+		string += strlen(string) + 1;
+		buf += strlen(buf) + 1;
+	}
+
+	if (func) {
+		func->num_info = nr_strings;
+		func->info = (const char**)buffer;
+	} else {
+		card->num_info = nr_strings;
+		card->info = (const char**)buffer;
+	}
+
+	return 0;
+}
+
+static int cistpl_manfid(struct mmc_card *card, struct sdio_func *func,
+			 const unsigned char *buf, unsigned size)
+{
+	unsigned int vendor, device;
+
+	/* TPLMID_MANF */
+	vendor = buf[0] | (buf[1] << 8);
+
+	/* TPLMID_CARD */
+	device = buf[2] | (buf[3] << 8);
+
+	if (func) {
+		func->vendor = vendor;
+		func->device = device;
+	} else {
+		card->cis.vendor = vendor;
+		card->cis.device = device;
+	}
+
+	return 0;
+}
+
+static const unsigned char speed_val[16] =
+	{ 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
+static const unsigned int speed_unit[8] =
+	{ 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 };
+
+static int cistpl_funce_common(struct mmc_card *card,
+			       const unsigned char *buf, unsigned size)
+{
+	if (size < 0x04 || buf[0] != 0)
+		return -EINVAL;
+
+	/* TPLFE_FN0_BLK_SIZE */
+	card->cis.blksize = buf[1] | (buf[2] << 8);
+
+	/* TPLFE_MAX_TRAN_SPEED */
+	card->cis.max_dtr = speed_val[(buf[3] >> 3) & 15] *
+			    speed_unit[buf[3] & 7];
+
+	return 0;
+}
+
+static int cistpl_funce_func(struct sdio_func *func,
+			     const unsigned char *buf, unsigned size)
+{
+	unsigned vsn;
+	unsigned min_size;
+
+	vsn = func->card->cccr.sdio_vsn;
+	min_size = (vsn == SDIO_SDIO_REV_1_00) ? 28 : 42;
+
+	if (size < min_size || buf[0] != 1)
+		return -EINVAL;
+
+	/* TPLFE_MAX_BLK_SIZE */
+	func->max_blksize = buf[12] | (buf[13] << 8);
+
+	return 0;
+}
+
+static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,
+			const unsigned char *buf, unsigned size)
+{
+	int ret;
+
+	/*
+	 * There should be two versions of the CISTPL_FUNCE tuple,
+	 * one for the common CIS (function 0) and a version used by
+	 * the individual function's CIS (1-7). Yet, the later has a
+	 * different length depending on the SDIO spec version.
+	 */
+	if (func)
+		ret = cistpl_funce_func(func, buf, size);
+	else
+		ret = cistpl_funce_common(card, buf, size);
+
+	if (ret) {
+		printk(KERN_ERR "%s: bad CISTPL_FUNCE size %u "
+		       "type %u\n", mmc_hostname(card->host), size, buf[0]);
+		return ret;
+	}
+
+	return 0;
+}
+
+typedef int (tpl_parse_t)(struct mmc_card *, struct sdio_func *,
+			   const unsigned char *, unsigned);
+
+struct cis_tpl {
+	unsigned char code;
+	unsigned char min_size;
+	tpl_parse_t *parse;
+};
+
+static const struct cis_tpl cis_tpl_list[] = {
+	{	0x15,	3,	cistpl_vers_1		},
+	{	0x20,	4,	cistpl_manfid		},
+	{	0x21,	2,	/* cistpl_funcid */	},
+	{	0x22,	0,	cistpl_funce		},
+};
+
+static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func)
+{
+	int ret;
+	struct sdio_func_tuple *this, **prev;
+	unsigned i, ptr = 0;
+
+	/*
+	 * Note that this works for the common CIS (function number 0) as
+	 * well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS
+	 * have the same offset.
+	 */
+	for (i = 0; i < 3; i++) {
+		unsigned char x, fn;
+
+		if (func)
+			fn = func->num;
+		else
+			fn = 0;
+
+		ret = mmc_io_rw_direct(card, 0, 0,
+			SDIO_FBR_BASE(fn) + SDIO_FBR_CIS + i, 0, &x);
+		if (ret)
+			return ret;
+		ptr |= x << (i * 8);
+	}
+
+	if (func)
+		prev = &func->tuples;
+	else
+		prev = &card->tuples;
+
+	BUG_ON(*prev);
+
+	do {
+		unsigned char tpl_code, tpl_link;
+
+		ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code);
+		if (ret)
+			break;
+
+		/* 0xff means we're done */
+		if (tpl_code == 0xff)
+			break;
+
+		ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_link);
+		if (ret)
+			break;
+
+		this = kmalloc(sizeof(*this) + tpl_link, GFP_KERNEL);
+		if (!this)
+			return -ENOMEM;
+
+		for (i = 0; i < tpl_link; i++) {
+			ret = mmc_io_rw_direct(card, 0, 0,
+					       ptr + i, 0, &this->data[i]);
+			if (ret)
+				break;
+		}
+		if (ret) {
+			kfree(this);
+			break;
+		}
+
+		for (i = 0; i < ARRAY_SIZE(cis_tpl_list); i++)
+			if (cis_tpl_list[i].code == tpl_code)
+				break;
+		if (i >= ARRAY_SIZE(cis_tpl_list)) {
+			/* this tuple is unknown to the core */
+			this->next = NULL;
+			this->code = tpl_code;
+			this->size = tpl_link;
+			*prev = this;
+			prev = &this->next;
+			printk(KERN_DEBUG
+			       "%s: queuing CIS tuple 0x%02x length %u\n",
+			       mmc_hostname(card->host), tpl_code, tpl_link);
+		} else {
+			const struct cis_tpl *tpl = cis_tpl_list + i;
+			if (tpl_link < tpl->min_size) {
+				printk(KERN_ERR
+				       "%s: bad CIS tuple 0x%02x (length = %u, expected >= %u)\n",
+				       mmc_hostname(card->host),
+				       tpl_code, tpl_link, tpl->min_size);
+				ret = -EINVAL;
+			} else if (tpl->parse) {
+				ret = tpl->parse(card, func,
+						 this->data, tpl_link);
+			}
+			kfree(this);
+		}
+
+		ptr += tpl_link;
+	} while (!ret);
+
+	/*
+	 * Link in all unknown tuples found in the common CIS so that
+	 * drivers don't have to go digging in two places.
+	 */
+	if (func)
+		*prev = card->tuples;
+
+	return ret;
+}
+
+int sdio_read_common_cis(struct mmc_card *card)
+{
+	return sdio_read_cis(card, NULL);
+}
+
+void sdio_free_common_cis(struct mmc_card *card)
+{
+	struct sdio_func_tuple *tuple, *victim;
+
+	tuple = card->tuples;
+
+	while (tuple) {
+		victim = tuple;
+		tuple = tuple->next;
+		kfree(victim);
+	}
+
+	card->tuples = NULL;
+}
+
+int sdio_read_func_cis(struct sdio_func *func)
+{
+	int ret;
+
+	ret = sdio_read_cis(func->card, func);
+	if (ret)
+		return ret;
+
+	/*
+	 * Since we've linked to tuples in the card structure,
+	 * we must make sure we have a reference to it.
+	 */
+	get_device(&func->card->dev);
+
+	/*
+	 * Vendor/device id is optional for function CIS, so
+	 * copy it from the card structure as needed.
+	 */
+	if (func->vendor == 0) {
+		func->vendor = func->card->cis.vendor;
+		func->device = func->card->cis.device;
+	}
+
+	return 0;
+}
+
+void sdio_free_func_cis(struct sdio_func *func)
+{
+	struct sdio_func_tuple *tuple, *victim;
+
+	tuple = func->tuples;
+
+	while (tuple && tuple != func->card->tuples) {
+		victim = tuple;
+		tuple = tuple->next;
+		kfree(victim);
+	}
+
+	func->tuples = NULL;
+
+	/*
+	 * We have now removed the link to the tuples in the
+	 * card structure, so remove the reference.
+	 */
+	put_device(&func->card->dev);
+}
+

drivers/mmc/core/sdio_cis.h

+/*
+ * linux/drivers/mmc/core/sdio_cis.h
+ *
+ * Author:	Nicolas Pitre
+ * Created:	June 11, 2007
+ * Copyright:	MontaVista Software Inc.
+ *
+ * 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.
+ */
+
+#ifndef _MMC_SDIO_CIS_H
+#define _MMC_SDIO_CIS_H
+
+int sdio_read_common_cis(struct mmc_card *card);
+void sdio_free_common_cis(struct mmc_card *card);
+
+int sdio_read_func_cis(struct sdio_func *func);
+void sdio_free_func_cis(struct sdio_func *func);
+
+#endif

drivers/mmc/core/sdio_irq.c

+/*
+ * linux/drivers/mmc/core/sdio_irq.c
+ *
+ * Author:      Nicolas Pitre
+ * Created:     June 18, 2007
+ * Copyright:   MontaVista Software Inc.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kthread.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+
+#include <linux/mmc/core.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "sdio_ops.h"
+
+static int process_sdio_pending_irqs(struct mmc_card *card)
+{
+	int i, ret, count;
+	unsigned char pending;
+
+	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, &pending);
+	if (ret) {
+		printk(KERN_DEBUG "%s: error %d reading SDIO_CCCR_INTx\n",
+		       mmc_card_id(card), ret);
+		return ret;
+	}
+
+	count = 0;
+	for (i = 1; i <= 7; i++) {
+		if (pending & (1 << i)) {
+			struct sdio_func *func = card->sdio_func[i - 1];
+			if (!func) {
+				printk(KERN_WARNING "%s: pending IRQ for "
+					"non-existant function\n",
+					mmc_card_id(card));
+				ret = -EINVAL;
+			} else if (func->irq_handler) {
+				func->irq_handler(func);
+				count++;
+			} else {
+				printk(KERN_WARNING "%s: pending IRQ with no handler\n",
+				       sdio_func_id(func));
+				ret = -EINVAL;
+			}
+		}
+	}
+
+	if (count)
+		return count;
+
+	return ret;
+}
+
+static int sdio_irq_thread(void *_host)
+{
+	struct mmc_host *host = _host;
+	struct sched_param param = { .sched_priority = 1 };
+	unsigned long period, idle_period;
+	int ret;
+
+	sched_setscheduler(current, SCHED_FIFO, &param);
+
+	/*
+	 * We want to allow for SDIO cards to work even on non SDIO
+	 * aware hosts.  One thing that non SDIO host cannot do is
+	 * asynchronous notification of pending SDIO card interrupts
+	 * hence we poll for them in that case.
+	 */
+	idle_period = msecs_to_jiffies(10);
+	period = (host->caps & MMC_CAP_SDIO_IRQ) ?
+		MAX_SCHEDULE_TIMEOUT : idle_period;
+
+	pr_debug("%s: IRQ thread started (poll period = %lu jiffies)\n",
+		 mmc_hostname(host), period);
+
+	do {
+		/*
+		 * We claim the host here on drivers behalf for a couple
+		 * reasons:
+		 *
+		 * 1) it is already needed to retrieve the CCCR_INTx;
+		 * 2) we want the driver(s) to clear the IRQ condition ASAP;
+		 * 3) we need to control the abort condition locally.
+		 *
+		 * Just like traditional hard IRQ handlers, we expect SDIO
+		 * IRQ handlers to be quick and to the point, so that the
+		 * holding of the host lock does not cover too much work
+		 * that doesn't require that lock to be held.
+		 */
+		ret = __mmc_claim_host(host, &host->sdio_irq_thread_abort);
+		if (ret)
+			break;
+		ret = process_sdio_pending_irqs(host->card);
+		mmc_release_host(host);
+
+		/*
+		 * Give other threads a chance to run in the presence of
+		 * errors.  FIXME: determine if due to card removal and
+		 * possibly exit this thread if so.
+		 */
+		if (ret < 0)
+			ssleep(1);
+
+		/*
+		 * Adaptive polling frequency based on the assumption
+		 * that an interrupt will be closely followed by more.
+		 * This has a substantial benefit for network devices.
+		 */
+		if (!(host->caps & MMC_CAP_SDIO_IRQ)) {
+			if (ret > 0)
+				period /= 2;
+			else {
+				period++;
+				if (period > idle_period)
+					period = idle_period;
+			}
+		}
+
+		set_task_state(current, TASK_INTERRUPTIBLE);
+		if (host->caps & MMC_CAP_SDIO_IRQ)
+			host->ops->enable_sdio_irq(host, 1);
+		if (!kthread_should_stop())
+			schedule_timeout(period);
+		set_task_state(current, TASK_RUNNING);
+	} while (!kthread_should_stop());
+
+	if (host->caps & MMC_CAP_SDIO_IRQ)
+		host->ops->enable_sdio_irq(host, 0);
+
+	pr_debug("%s: IRQ thread exiting with code %d\n",
+		 mmc_hostname(host), ret);
+
+	return ret;
+}
+
+static int sdio_card_irq_get(struct mmc_card *card)
+{
+	struct mmc_host *host = card->host;
+
+	WARN_ON(!host->claimed);
+
+	if (!host->sdio_irqs++) {
+		atomic_set(&host->sdio_irq_thread_abort, 0);
+		host->sdio_irq_thread =
+			kthread_run(sdio_irq_thread, host, "ksdiorqd");
+		if (IS_ERR(host->sdio_irq_thread)) {
+			int err = PTR_ERR(host->sdio_irq_thread);
+			host->sdio_irqs--;
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+static int sdio_card_irq_put(struct mmc_card *card)
+{
+	struct mmc_host *host = card->host;
+
+	WARN_ON(!host->claimed);
+	BUG_ON(host->sdio_irqs < 1);
+
+	if (!--host->sdio_irqs) {
+		atomic_set(&host->sdio_irq_thread_abort, 1);
+		kthread_stop(host->sdio_irq_thread);
+	}
+
+	return 0;
+}
+
+/**
+ *	sdio_claim_irq - claim the IRQ for a SDIO function
+ *	@func: SDIO function
+ *	@handler: IRQ handler callback
+ *
+ *	Claim and activate the IRQ for the given SDIO function. The provided
+ *	handler will be called when that IRQ is asserted.  The host is always
+ *	claimed already when the handler is called so the handler must not
+ *	call sdio_claim_host() nor sdio_release_host().
+ */
+int sdio_claim_irq(struct sdio_func *func, sdio_irq_handler_t *handler)
+{
+	int ret;
+	unsigned char reg;
+
+	BUG_ON(!func);
+	BUG_ON(!func->card);
+
+	pr_debug("SDIO: Enabling IRQ for %s...\n", sdio_func_id(func));
+
+	if (func->irq_handler) {
+		pr_debug("SDIO: IRQ for %s already in use.\n", sdio_func_id(func));
+		return -EBUSY;
+	}
+
+	ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, &reg);
+	if (ret)
+		return ret;
+
+	reg |= 1 << func->num;
+
+	reg |= 1; /* Master interrupt enable */
+
+	ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IENx, reg, NULL);
+	if (ret)
+		return ret;
+
+	func->irq_handler = handler;
+	ret = sdio_card_irq_get(func->card);
+	if (ret)
+		func->irq_handler = NULL;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sdio_claim_irq);
+
+/**
+ *	sdio_release_irq - release the IRQ for a SDIO function
+ *	@func: SDIO function
+ *
+ *	Disable and release the IRQ for the given SDIO function.
+ */
+int sdio_release_irq(struct sdio_func *func)
+{
+	int ret;
+	unsigned char reg;
+
+	BUG_ON(!func);
+	BUG_ON(!func->card);
+
+	pr_debug("SDIO: Disabling IRQ for %s...\n", sdio_func_id(func));
+
+	if (func->irq_handler) {
+		func->irq_handler = NULL;
+		sdio_card_irq_put(func->card);
+	}
+
+	ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, &reg);
+	if (ret)
+		return ret;
+
+	reg &= ~(1 << func->num);
+
+	/* Disable master interrupt with the last function interrupt */
+	if (!(reg & 0xFE))
+		reg = 0;
+
+	ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IENx, reg, NULL);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(sdio_release_irq);
+

drivers/mmc/core/sdio_ops.c

+/*
+ *  linux/drivers/mmc/sdio_ops.c
+ *
+ *  Copyright 2006-2007 Pierre Ossman
+ *
+ * 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.
+ */
+
+#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sdio.h>
+
+#include "core.h"
+
+int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
+{
+	struct mmc_command cmd;
+	int i, err = 0;
+
+	BUG_ON(!host);
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = SD_IO_SEND_OP_COND;
+	cmd.arg = ocr;
+	cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
+
+	for (i = 100; i; i--) {
+		err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+		if (err)
+			break;
+
+		/* if we're just probing, do a single pass */
+		if (ocr == 0)
+			break;
+
+		/* otherwise wait until reset completes */
+		if (mmc_host_is_spi(host)) {
+			/*
+			 * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
+			 * an initialized card under SPI, but some cards
+			 * (Marvell's) only behave when looking at this
+			 * one.
+			 */
+			if (cmd.resp[1] & MMC_CARD_BUSY)
+				break;
+		} else {
+			if (cmd.resp[0] & MMC_CARD_BUSY)
+				break;
+		}
+
+		err = -ETIMEDOUT;
+
+		mmc_delay(10);
+	}
+
+	if (rocr)
+		*rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
+
+	return err;
+}
+
+int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
+	unsigned addr, u8 in, u8* out)
+{
+	struct mmc_command cmd;
+	int err;
+
+	BUG_ON(!card);
+	BUG_ON(fn > 7);
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = SD_IO_RW_DIRECT;
+	cmd.arg = write ? 0x80000000 : 0x00000000;
+	cmd.arg |= fn << 28;
+	cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
+	cmd.arg |= addr << 9;
+	cmd.arg |= in;
+	cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
+
+	err = mmc_wait_for_cmd(card->host, &cmd, 0);
+	if (err)
+		return err;
+
+	if (mmc_host_is_spi(card->host)) {
+		/* host driver already reported errors */
+	} else {
+		if (cmd.resp[0] & R5_ERROR)
+			return -EIO;
+		if (cmd.resp[0] & R5_FUNCTION_NUMBER)
+			return -EINVAL;
+		if (cmd.resp[0] & R5_OUT_OF_RANGE)
+			return -ERANGE;
+	}
+
+	if (out) {
+		if (mmc_host_is_spi(card->host))
+			*out = (cmd.resp[0] >> 8) & 0xFF;
+		else
+			*out = cmd.resp[0] & 0xFF;
+	}
+
+	return 0;
+}
+
+int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
+	unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
+{
+	struct mmc_request mrq;
+	struct mmc_command cmd;
+	struct mmc_data data;
+	struct scatterlist sg;
+
+	BUG_ON(!card);
+	BUG_ON(fn > 7);
+	BUG_ON(blocks == 1 && blksz > 512);
+	WARN_ON(blocks == 0);
+	WARN_ON(blksz == 0);
+
+	memset(&mrq, 0, sizeof(struct mmc_request));
+	memset(&cmd, 0, sizeof(struct mmc_command));
+	memset(&data, 0, sizeof(struct mmc_data));
+
+	mrq.cmd = &cmd;
+	mrq.data = &data;
+
+	cmd.opcode = SD_IO_RW_EXTENDED;
+	cmd.arg = write ? 0x80000000 : 0x00000000;
+	cmd.arg |= fn << 28;
+	cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
+	cmd.arg |= addr << 9;
+	if (blocks == 1 && blksz <= 512)
+		cmd.arg |= (blksz == 512) ? 0 : blksz;	/* byte mode */
+	else
+		cmd.arg |= 0x08000000 | blocks;		/* block mode */
+	cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
+
+	data.blksz = blksz;
+	data.blocks = blocks;
+	data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
+	data.sg = &sg;
+	data.sg_len = 1;
+
+	sg_init_one(&sg, buf, blksz * blocks);
+
+	mmc_set_data_timeout(&data, card);
+
+	mmc_wait_for_req(card->host, &mrq);
+
+	if (cmd.error)
+		return cmd.error;
+	if (data.error)
+		return data.error;
+
+	if (mmc_host_is_spi(card->host)) {
+		/* host driver already reported errors */
+	} else {
+		if (cmd.resp[0] & R5_ERROR)
+			return -EIO;
+		if (cmd.resp[0] & R5_FUNCTION_NUMBER)
+			return -EINVAL;
+		if (cmd.resp[0] & R5_OUT_OF_RANGE)
+			return -ERANGE;
+	}
+
+	return 0;
+}
+

drivers/mmc/core/sdio_ops.h

+/*
+ *  linux/drivers/mmc/sdio_ops.c
+ *
+ *  Copyright 2006-2007 Pierre Ossman
+ *
+ * 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.
+ */
+
+#ifndef _MMC_SDIO_OPS_H
+#define _MMC_SDIO_OPS_H
+
+int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr);
+int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
+	unsigned addr, u8 in, u8* out);
+int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
+	unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz);
+
+#endif
+

drivers/mmc/host/Makefile

@@ -10,9 +10,11 @@ obj-$(CONFIG_MMC_ARMMMCI)	+= mmci.o
 obj-$(CONFIG_MMC_PXA)		+= pxamci.o
 obj-$(CONFIG_MMC_IMX)		+= imxmmc.o
 obj-$(CONFIG_MMC_SDHCI)		+= sdhci.o
+obj-$(CONFIG_MMC_RICOH_MMC)	+= ricoh_mmc.o
 obj-$(CONFIG_MMC_WBSD)		+= wbsd.o
 obj-$(CONFIG_MMC_AU1X)		+= au1xmmc.o
 obj-$(CONFIG_MMC_OMAP)		+= omap.o
 obj-$(CONFIG_MMC_AT91)		+= at91_mci.o
 obj-$(CONFIG_MMC_TIFM_SD)	+= tifm_sd.o
+obj-$(CONFIG_MMC_SPI)		+= mmc_spi.o