Merge git://git.infradead.org/~dedekind/ubi-2.6

[linux-2.6-omap-h63xx.git] / drivers / mmc / core / core.c

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index b8f27e5ade97a3eb0ff417c4fad987ee9dc711de..b96667448eb5618ffcfae4e02e15cfaeca52146f 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -18,7 +18,7 @@
 #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>
@@ -41,6 +41,14 @@ 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.
  */
@@ -71,6 +79,11 @@ 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);
@@ -79,6 +92,8 @@ 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],
@@ -121,7 +136,7 @@ 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);
        }
 
@@ -133,6 +148,8 @@ 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) {
@@ -202,7 +219,7 @@ 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));
 
@@ -231,6 +248,15 @@ 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
         */
@@ -273,15 +299,20 @@ 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();
 
@@ -289,19 +320,24 @@ 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);
-       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
@@ -314,7 +350,7 @@ 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;
@@ -434,19 +470,32 @@ 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;
-       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);
 }
 
@@ -454,8 +503,10 @@ static void mmc_power_off(struct mmc_host *host)
 {
        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;
@@ -512,7 +563,7 @@ 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);
 
@@ -536,8 +587,8 @@ 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);
 
@@ -565,7 +616,7 @@ 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