[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>

diff --git a/arch/arm/mach-pxa/lubbock.c b/arch/arm/mach-pxa/lubbock.c
index beccf45..689f313 100644 (file)
--- 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)