[MMC] support for mmc chip select in wbsd

Use the chip select ios in the wbsd driver.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 52 insertions, 15 deletions

diff --git a/drivers/mmc/wbsd.c b/drivers/mmc/wbsd.c
index 402c2d661fb2..08ae22aed9e8 100644
--- a/drivers/mmc/wbsd.c
+++ b/drivers/mmc/wbsd.c
@@ -42,7 +42,7 @@
 #include "wbsd.h"
 
 #define DRIVER_NAME "wbsd"
-#define DRIVER_VERSION "1.3"
+#define DRIVER_VERSION "1.4"
 
 #ifdef CONFIG_MMC_DEBUG
 #define DBG(x...) \
@@ -960,8 +960,9 @@ static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
         struct wbsd_host* host = mmc_priv(mmc);
         u8 clk, setup, pwr;
         
-        DBGF("clock %uHz busmode %u powermode %u Vdd %u\n",
-                ios->clock, ios->bus_mode, ios->power_mode, ios->vdd);
+        DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u\n",
+                ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
+                ios->vdd);
 
         spin_lock_bh(&host->lock);
 
@@ -1003,13 +1004,11 @@ static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
 
         /*
          * MMC cards need to have pin 1 high during init.
-         * Init time corresponds rather nicely with the bus mode.
          * It wreaks havoc with the card detection though so
-         * that needs to be disabed.
+         * that needs to be disabled.
          */
         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
-        if ((ios->power_mode == MMC_POWER_ON) &&
-                (ios->bus_mode == MMC_BUSMODE_OPENDRAIN))
+        if (ios->chip_select == MMC_CS_HIGH)
         {
                 setup |= WBSD_DAT3_H;
                 host->flags |= WBSD_FIGNORE_DETECT;
@@ -1017,7 +1016,12 @@ static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
         else
         {
                 setup &= ~WBSD_DAT3_H;
-                host->flags &= ~WBSD_FIGNORE_DETECT;
+
+                /*
+                 * We cannot resume card detection immediatly
+                 * because of capacitance and delays in the chip.
+                 */
+                mod_timer(&host->ignore_timer, jiffies + HZ/100);
         }
         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
         
@@ -1036,6 +1040,31 @@ static struct mmc_host_ops wbsd_ops = {
 \*****************************************************************************/
 
 /*
+ * Helper function to reset detection ignore
+ */
+
+static void wbsd_reset_ignore(unsigned long data)
+{
+        struct wbsd_host *host = (struct wbsd_host*)data;
+
+        BUG_ON(host == NULL);
+
+        DBG("Resetting card detection ignore\n");
+
+        spin_lock_bh(&host->lock);
+
+        host->flags &= ~WBSD_FIGNORE_DETECT;
+
+        /*
+         * Card status might have changed during the
+         * blackout.
+         */
+        tasklet_schedule(&host->card_tasklet);
+
+        spin_unlock_bh(&host->lock);
+}
+
+/*
  * Helper function for card detection
  */
 static void wbsd_detect_card(unsigned long data)
@@ -1097,7 +1126,7 @@ static void wbsd_tasklet_card(unsigned long param)
                          * Delay card detection to allow electrical connections
                          * to stabilise.
                          */
-                        mod_timer(&host->timer, jiffies + HZ/2);
+                        mod_timer(&host->detect_timer, jiffies + HZ/2);
                 }
                 
                 spin_unlock(&host->lock);
@@ -1124,6 +1153,8 @@ static void wbsd_tasklet_card(unsigned long param)
 
                 mmc_detect_change(host->mmc);
         }
+        else
+                spin_unlock(&host->lock);
 }
 
 static void wbsd_tasklet_fifo(unsigned long param)
@@ -1328,11 +1359,15 @@ static int __devinit wbsd_alloc_mmc(struct device* dev)
         spin_lock_init(&host->lock);
         
         /*
-         * Set up detection timer
+         * Set up timers
          */
-        init_timer(&host->timer);
-        host->timer.data = (unsigned long)host;
-        host->timer.function = wbsd_detect_card;
+        init_timer(&host->detect_timer);
+        host->detect_timer.data = (unsigned long)host;
+        host->detect_timer.function = wbsd_detect_card;
+
+        init_timer(&host->ignore_timer);
+        host->ignore_timer.data = (unsigned long)host;
+        host->ignore_timer.function = wbsd_reset_ignore;
         
         /*
          * Maximum number of segments. Worst case is one sector per segment
@@ -1370,7 +1405,8 @@ static void __devexit wbsd_free_mmc(struct device* dev)
         host = mmc_priv(mmc);
         BUG_ON(host == NULL);
         
-        del_timer_sync(&host->timer);
+        del_timer_sync(&host->ignore_timer);
+        del_timer_sync(&host->detect_timer);
         
         mmc_free_host(mmc);
         
diff --git a/drivers/mmc/wbsd.h b/drivers/mmc/wbsd.h
index 661a9f6a6e6f..8af43549f5d5 100644
--- a/drivers/mmc/wbsd.h
+++ b/drivers/mmc/wbsd.h
@@ -181,5 +181,6 @@ struct wbsd_host
         struct tasklet_struct   finish_tasklet;
         struct tasklet_struct   block_tasklet;
         
-        struct timer_list       timer;          /* Card detection timer */
+        struct timer_list       detect_timer;   /* Card detection timer */
+        struct timer_list       ignore_timer;   /* Ignore detection timer */
 };