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>

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index b1edcef..21acecc 100644 (file)
--- 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);