at91_mci: use generic GPIO calls

Update the AT91 MMC driver to use the generic GPIO calls instead of the
AT91-specific calls; and to request (and release) those GPIO signals.

That required updating the probe() fault cleanup codepaths.  Now there
is a single sequence for freeing resources, in reverse order of their
allocation.  Also that code uses use dev_*() for messaging, and has less
abuse of KERN_ERR.

Likewise with updating remove() cleanup.  This had to free the GPIOs,
and while adding that code I noticed and fixed two other problems:  it
was poking at a workqueue owned by the mmc core; and in one (rare)
case would try freeing an IRQ that it didn't allocate.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 80 insertions, 34 deletions

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index b1edcefdd4f9..21acecc9fe3a 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -70,10 +70,11 @@
 
 #include <asm/io.h>
 #include <asm/irq.h>
+#include <asm/gpio.h>
+
 #include <asm/mach/mmc.h>
 #include <asm/arch/board.h>
 #include <asm/arch/cpu.h>
-#include <asm/arch/gpio.h>
 #include <asm/arch/at91_mci.h>
 
 #define DRIVER_NAME "at91_mci"
@@ -659,11 +660,11 @@ static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         if (host->board->vcc_pin) {
                 switch (ios->power_mode) {
                         case MMC_POWER_OFF:
-                                at91_set_gpio_value(host->board->vcc_pin, 0);
+                                gpio_set_value(host->board->vcc_pin, 0);
                                 break;
                         case MMC_POWER_UP:
                         case MMC_POWER_ON:
-                                at91_set_gpio_value(host->board->vcc_pin, 1);
+                                gpio_set_value(host->board->vcc_pin, 1);
                                 break;
                 }
         }
@@ -768,7 +769,7 @@ static irqreturn_t at91_mci_irq(int irq, void *devid)
 static irqreturn_t at91_mmc_det_irq(int irq, void *_host)
 {
         struct at91mci_host *host = _host;
-        int present = !at91_get_gpio_value(irq);
+        int present = !gpio_get_value(irq_to_gpio(irq));
 
         /*
          * we expect this irq on both insert and remove,
@@ -793,7 +794,7 @@ static int at91_mci_get_ro(struct mmc_host *mmc)
         struct at91mci_host *host = mmc_priv(mmc);
 
         if (host->board->wp_pin) {
-                read_only = at91_get_gpio_value(host->board->wp_pin);
+                read_only = gpio_get_value(host->board->wp_pin);
                 printk(KERN_WARNING "%s: card is %s\n", mmc_hostname(mmc),
                                 (read_only ? "read-only" : "read-write") );
         }
@@ -820,8 +821,6 @@ static int __init at91_mci_probe(struct platform_device *pdev)
         struct resource *res;
         int ret;
 
-        pr_debug("Probe MCI devices\n");
-
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (!res)
                 return -ENXIO;
@@ -831,9 +830,9 @@ static int __init at91_mci_probe(struct platform_device *pdev)
 
         mmc = mmc_alloc_host(sizeof(struct at91mci_host), &pdev->dev);
         if (!mmc) {
-                pr_debug("Failed to allocate mmc host\n");
-                release_mem_region(res->start, res->end - res->start + 1);
-                return -ENOMEM;
+                ret = -ENOMEM;
+                dev_dbg(&pdev->dev, "couldn't allocate mmc host\n");
+                goto fail6;
         }
 
         mmc->ops = &at91_mci_ops;
@@ -853,19 +852,44 @@ static int __init at91_mci_probe(struct platform_device *pdev)
                 if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
                         mmc->caps |= MMC_CAP_4_BIT_DATA;
                 else
-                        printk("AT91 MMC: 4 wire bus mode not supported"
+                        dev_warn(&pdev->dev, "4 wire bus mode not supported"
                                 " - using 1 wire\n");
         }
 
         /*
+         * Reserve GPIOs ... board init code makes sure these pins are set
+         * up as GPIOs with the right direction (input, except for vcc)
+         */
+        if (host->board->det_pin) {
+                ret = gpio_request(host->board->det_pin, "mmc_detect");
+                if (ret < 0) {
+                        dev_dbg(&pdev->dev, "couldn't claim card detect pin\n");
+                        goto fail5;
+                }
+        }
+        if (host->board->wp_pin) {
+                ret = gpio_request(host->board->wp_pin, "mmc_wp");
+                if (ret < 0) {
+                        dev_dbg(&pdev->dev, "couldn't claim wp sense pin\n");
+                        goto fail4;
+                }
+        }
+        if (host->board->vcc_pin) {
+                ret = gpio_request(host->board->vcc_pin, "mmc_vcc");
+                if (ret < 0) {
+                        dev_dbg(&pdev->dev, "couldn't claim vcc switch pin\n");
+                        goto fail3;
+                }
+        }
+
+        /*
          * Get Clock
          */
         host->mci_clk = clk_get(&pdev->dev, "mci_clk");
         if (IS_ERR(host->mci_clk)) {
-                printk(KERN_ERR "AT91 MMC: no clock defined.\n");
-                mmc_free_host(mmc);
-                release_mem_region(res->start, res->end - res->start + 1);
-                return -ENODEV;
+                ret = -ENODEV;
+                dev_dbg(&pdev->dev, "no mci_clk?\n");
+                goto fail2;
         }
 
         /*
@@ -873,10 +897,8 @@ static int __init at91_mci_probe(struct platform_device *pdev)
          */
         host->baseaddr = ioremap(res->start, res->end - res->start + 1);
         if (!host->baseaddr) {
-                clk_put(host->mci_clk);
-                mmc_free_host(mmc);
-                release_mem_region(res->start, res->end - res->start + 1);
-                return -ENOMEM;
+                ret = -ENOMEM;
+                goto fail1;
         }
 
         /*
@@ -890,15 +912,11 @@ static int __init at91_mci_probe(struct platform_device *pdev)
          * Allocate the MCI interrupt
          */
         host->irq = platform_get_irq(pdev, 0);
-        ret = request_irq(host->irq, at91_mci_irq, IRQF_SHARED, DRIVER_NAME, host);
+        ret = request_irq(host->irq, at91_mci_irq, IRQF_SHARED,
+                        mmc_hostname(mmc), host);
         if (ret) {
-                printk(KERN_ERR "AT91 MMC: Failed to request MCI interrupt\n");
-                clk_disable(host->mci_clk);
-                clk_put(host->mci_clk);
-                mmc_free_host(mmc);
-                iounmap(host->baseaddr);
-                release_mem_region(res->start, res->end - res->start + 1);
-                return ret;
+                dev_dbg(&pdev->dev, "request MCI interrupt failed\n");
+                goto fail0;
         }
 
         platform_set_drvdata(pdev, mmc);
@@ -907,8 +925,7 @@ static int __init at91_mci_probe(struct platform_device *pdev)
          * Add host to MMC layer
          */
         if (host->board->det_pin) {
-                host->present = !at91_get_gpio_value(host->board->det_pin);
-                device_init_wakeup(&pdev->dev, 1);
+                host->present = !gpio_get_value(host->board->det_pin);
         }
         else
                 host->present = -1;
@@ -919,15 +936,38 @@ static int __init at91_mci_probe(struct platform_device *pdev)
          * monitor card insertion/removal if we can
          */
         if (host->board->det_pin) {
-                ret = request_irq(host->board->det_pin, at91_mmc_det_irq,
-                                0, DRIVER_NAME, host);
+                ret = request_irq(gpio_to_irq(host->board->det_pin),
+                                at91_mmc_det_irq, 0, mmc_hostname(mmc), host);
                 if (ret)
-                        printk(KERN_ERR "AT91 MMC: Couldn't allocate MMC detect irq\n");
+                        dev_warn(&pdev->dev, "request MMC detect irq failed\n");
+                else
+                        device_init_wakeup(&pdev->dev, 1);
         }
 
         pr_debug("Added MCI driver\n");
 
         return 0;
+
+fail0:
+        clk_disable(host->mci_clk);
+        iounmap(host->baseaddr);
+fail1:
+        clk_put(host->mci_clk);
+fail2:
+        if (host->board->vcc_pin)
+                gpio_free(host->board->vcc_pin);
+fail3:
+        if (host->board->wp_pin)
+                gpio_free(host->board->wp_pin);
+fail4:
+        if (host->board->det_pin)
+                gpio_free(host->board->det_pin);
+fail5:
+        mmc_free_host(mmc);
+fail6:
+        release_mem_region(res->start, res->end - res->start + 1);
+        dev_err(&pdev->dev, "probe failed, err %d\n", ret);
+        return ret;
 }
 
 /*
@@ -945,9 +985,10 @@ static int __exit at91_mci_remove(struct platform_device *pdev)
         host = mmc_priv(mmc);
 
         if (host->board->det_pin) {
+                if (device_can_wakeup(&pdev->dev))
+                        free_irq(gpio_to_irq(host->board->det_pin), host);
                 device_init_wakeup(&pdev->dev, 0);
-                free_irq(host->board->det_pin, host);
-                cancel_delayed_work(&host->mmc->detect);
+                gpio_free(host->board->det_pin);
         }
 
         at91_mci_disable(host);
@@ -957,6 +998,11 @@ static int __exit at91_mci_remove(struct platform_device *pdev)
         clk_disable(host->mci_clk);                     /* Disable the peripheral clock */
         clk_put(host->mci_clk);
 
+        if (host->board->vcc_pin)
+                gpio_free(host->board->vcc_pin);
+        if (host->board->wp_pin)
+                gpio_free(host->board->wp_pin);
+
         iounmap(host->baseaddr);
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         release_mem_region(res->start, res->end - res->start + 1);