#include <linux/delay.h>
#include <linux/pagemap.h>
#include <linux/err.h>
-#include <asm/scatterlist.h>
+#include <linux/leds.h>
#include <linux/scatterlist.h>
#include <linux/mmc/card.h>
#include "core.h"
#include "bus.h"
#include "host.h"
+#include "sdio_bus.h"
#include "mmc_ops.h"
#include "sd_ops.h"
-
-extern int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
-extern int mmc_attach_sd(struct mmc_host *host, u32 ocr);
+#include "sdio_ops.h"
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.
*/
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);
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],
EXPORT_SYMBOL(mmc_request_done);
-/**
- * mmc_start_request - start a command on a host
- * @host: MMC host to start command on
- * @mrq: MMC request to start
- *
- * Queue a command on the specified host. We expect the
- * caller to be holding the host lock with interrupts disabled.
- */
-void
+static void
mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
{
#ifdef CONFIG_MMC_DEBUG
"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);
}
WARN_ON(!host->claimed);
+ led_trigger_event(host->led, LED_FULL);
+
mrq->cmd->error = 0;
mrq->cmd->mrq = mrq;
if (mrq->data) {
host->ops->request(host, mrq);
}
-EXPORT_SYMBOL(mmc_start_request);
-
static void mmc_wait_done(struct mmc_request *mrq)
{
complete(mrq->done_data);
{
struct mmc_request mrq;
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
memset(&mrq, 0, sizeof(struct mmc_request));
* 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
*/
* 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;
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;
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();
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);
- host->claimed = 1;
+ 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
{
unsigned long flags;
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
spin_lock_irqsave(&host->lock, flags);
host->claimed = 0;
int bit = fls(host->ocr_avail) - 1;
host->ios.vdd = bit;
- host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
- host->ios.chip_select = MMC_CS_DONTCARE;
+ 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);
}
{
host->ios.clock = 0;
host->ios.vdd = 0;
- host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
- host->ios.chip_select = MMC_CS_DONTCARE;
+ 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;
mmc_set_ios(host);
}
+/*
+ * Cleanup when the last reference to the bus operator is dropped.
+ */
+static void __mmc_release_bus(struct mmc_host *host)
+{
+ BUG_ON(!host);
+ BUG_ON(host->bus_refs);
+ BUG_ON(!host->bus_dead);
+
+ host->bus_ops = NULL;
+}
+
+/*
+ * Increase reference count of bus operator
+ */
+static inline void mmc_bus_get(struct mmc_host *host)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ host->bus_refs++;
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+/*
+ * Decrease reference count of bus operator and free it if
+ * it is the last reference.
+ */
+static inline void mmc_bus_put(struct mmc_host *host)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ host->bus_refs--;
+ if ((host->bus_refs == 0) && host->bus_ops)
+ __mmc_release_bus(host);
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
/*
* Assign a mmc bus handler to a host. Only one bus handler may control a
* host at any given time.
BUG_ON(!host);
BUG_ON(!ops);
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
spin_lock_irqsave(&host->lock, flags);
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);
mmc_bus_put(host);
}
-/*
- * Cleanup when the last reference to the bus operator is dropped.
- */
-void __mmc_release_bus(struct mmc_host *host)
-{
- BUG_ON(!host);
- BUG_ON(host->bus_refs);
- BUG_ON(!host->bus_dead);
-
- host->bus_ops = NULL;
-}
-
/**
* mmc_detect_change - process change of state on a MMC socket
* @host: host which changed state.
#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
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 {
- /*
- * If we fail to detect any SD cards then try
- * searching for MMC cards.
- */
- err = mmc_send_op_cond(host, 0, &ocr);
- if (err == MMC_ERR_NONE) {
- if (mmc_attach_mmc(host, ocr))
- mmc_power_off(host);
- } else {
+ return;
+ }
+
+ /*
+ * ...and finally MMC.
+ */
+ err = mmc_send_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_mmc(host, ocr))
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);
return -ENOMEM;
ret = mmc_register_bus();
- if (ret == 0) {
- ret = mmc_register_host_class();
- if (ret)
- mmc_unregister_bus();
- }
+ 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");
projects / linux-2.6 / blobdiff