[PATCH] at91_mci: use generic GPIO calls
From: Nicolas Ferre
Date: Mon Feb 04 2008 - 12:13:19 EST
From: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
---
Little update from previous patch to match the modification introduced
by :
http://lkml.org/lkml/2008/1/30/308
So it applies on to of it.
drivers/mmc/host/at91_mci.c | 114 ++++++++++++++++++++++++++++++--------------
1 file changed, 80 insertions(+), 34 deletions(-)
--- linux-2.6-snapshot.orig/drivers/mmc/host/at91_mci.c
+++ linux-2.6-snapshot/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"
@@ -659,10 +660,10 @@ static void at91_mci_set_ios(struct mmc_
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:
- at91_set_gpio_value(host->board->vcc_pin, 1);
+ gpio_set_value(host->board->vcc_pin, 1);
break;
default:
break;
@@ -769,7 +770,7 @@ static irqreturn_t at91_mci_irq(int irq,
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,
@@ -794,7 +795,7 @@ static int at91_mci_get_ro(struct mmc_ho
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") );
}
@@ -821,8 +822,6 @@ static int __init at91_mci_probe(struct
struct resource *res;
int ret;
- pr_debug("Probe MCI devices\n");
-
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENXIO;
@@ -832,9 +831,9 @@ static int __init at91_mci_probe(struct
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;
@@ -854,19 +853,44 @@ static int __init at91_mci_probe(struct
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;
}
/*
@@ -874,10 +898,8 @@ static int __init at91_mci_probe(struct
*/
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;
}
/*
@@ -891,15 +913,11 @@ static int __init at91_mci_probe(struct
* 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);
@@ -908,8 +926,7 @@ static int __init at91_mci_probe(struct
* 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;
@@ -920,15 +937,38 @@ static int __init at91_mci_probe(struct
* 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;
}
/*
@@ -946,9 +986,10 @@ static int __exit at91_mci_remove(struct
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);
@@ -958,6 +999,11 @@ static int __exit at91_mci_remove(struct
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);
--
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