[ARM] 3078/1: lubbock platform updates, mostly mmc detection

Patch from David Brownell

Lubbock updates:

  * Provide an address for the SMC91x chip that doesn't generate
    a boot-time warning (matching the EEPROM).

  * Update MMC support to (a) detect card insert/remove, and
    (b) report the readonly switch setting for SD cards.

Previously, MMC/SD cards had to be present at boot time else they
couldn't be detected.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 60 insertions, 3 deletions

diff --git a/arch/arm/mach-pxa/lubbock.c b/arch/arm/mach-pxa/lubbock.c
index beccf455f796..689f31349bd6 100644
--- a/arch/arm/mach-pxa/lubbock.c
+++ b/arch/arm/mach-pxa/lubbock.c
@@ -175,7 +175,7 @@ static struct platform_device sa1111_device = {
 static struct resource smc91x_resources[] = {
         [0] = {
                 .name   = "smc91x-regs",
-                .start  = 0x0c000000,
+                .start  = 0x0c000c00,
                 .end    = 0x0c0fffff,
                 .flags  = IORESOURCE_MEM,
         },
@@ -224,18 +224,75 @@ static struct pxafb_mach_info sharp_lm8v31 __initdata = {
         .lccr3          = LCCR3_PCP | LCCR3_Acb(255),
 };
 
-static int lubbock_mci_init(struct device *dev, irqreturn_t (*lubbock_detect_int)(int, void *, struct pt_regs *), void *data)
+#define MMC_POLL_RATE           msecs_to_jiffies(1000)
+
+static void lubbock_mmc_poll(unsigned long);
+static irqreturn_t (*mmc_detect_int)(int, void *, struct pt_regs *);
+
+static struct timer_list mmc_timer = {
+        .function       = lubbock_mmc_poll,
+};
+
+static void lubbock_mmc_poll(unsigned long data)
+{
+        unsigned long flags;
+
+        /* clear any previous irq state, then ... */
+        local_irq_save(flags);
+        LUB_IRQ_SET_CLR &= ~(1 << 0);
+        local_irq_restore(flags);
+
+        /* poll until mmc/sd card is removed */
+        if (LUB_IRQ_SET_CLR & (1 << 0))
+                mod_timer(&mmc_timer, jiffies + MMC_POLL_RATE);
+        else {
+                (void) mmc_detect_int(LUBBOCK_SD_IRQ, (void *)data, NULL);
+                enable_irq(LUBBOCK_SD_IRQ);
+        }
+}
+
+static irqreturn_t lubbock_detect_int(int irq, void *data, struct pt_regs *regs)
+{
+        /* IRQ is level triggered; disable, and poll for removal */
+        disable_irq(irq);
+        mod_timer(&mmc_timer, jiffies + MMC_POLL_RATE);
+
+        return mmc_detect_int(irq, data, regs);
+}
+
+static int lubbock_mci_init(struct device *dev,
+                irqreturn_t (*detect_int)(int, void *, struct pt_regs *),
+                void *data)
 {
         /* setup GPIO for PXA25x MMC controller */
         pxa_gpio_mode(GPIO6_MMCCLK_MD);
         pxa_gpio_mode(GPIO8_MMCCS0_MD);
 
-        return 0;
+        /* detect card insert/eject */
+        mmc_detect_int = detect_int;
+        init_timer(&mmc_timer);
+        mmc_timer.data = (unsigned long) data;
+        return request_irq(LUBBOCK_SD_IRQ, lubbock_detect_int,
+                        SA_SAMPLE_RANDOM, "lubbock-sd-detect", data);
+}
+
+static int lubbock_mci_get_ro(struct device *dev)
+{
+        return (LUB_MISC_RD & (1 << 2)) != 0;
+}
+
+static void lubbock_mci_exit(struct device *dev, void *data)
+{
+        free_irq(LUBBOCK_SD_IRQ, data);
+        del_timer_sync(&mmc_timer);
 }
 
 static struct pxamci_platform_data lubbock_mci_platform_data = {
         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
+        .detect_delay   = 1,
         .init           = lubbock_mci_init,
+        .get_ro         = lubbock_mci_get_ro,
+        .exit           = lubbock_mci_exit,
 };
 
 static void lubbock_irda_transceiver_mode(struct device *dev, int mode)