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path: root/drivers/mmc/core/sdio_irq.c
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Diffstat (limited to 'drivers/mmc/core/sdio_irq.c')
-rw-r--r--drivers/mmc/core/sdio_irq.c127
1 files changed, 103 insertions, 24 deletions
diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c
index 3bd3021f5e8..5cc13c8d35b 100644
--- a/drivers/mmc/core/sdio_irq.c
+++ b/drivers/mmc/core/sdio_irq.c
@@ -5,6 +5,8 @@
* Created: June 18, 2007
* Copyright: MontaVista Software Inc.
*
+ * Copyright 2008 Pierre Ossman
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
@@ -14,6 +16,7 @@
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kthread.h>
+#include <linux/export.h>
#include <linux/wait.h>
#include <linux/delay.h>
@@ -25,32 +28,56 @@
#include "sdio_ops.h"
-static int process_sdio_pending_irqs(struct mmc_card *card)
+static int process_sdio_pending_irqs(struct mmc_host *host)
{
+ struct mmc_card *card = host->card;
int i, ret, count;
unsigned char pending;
+ struct sdio_func *func;
+
+ /*
+ * Optimization, if there is only 1 function interrupt registered
+ * and we know an IRQ was signaled then call irq handler directly.
+ * Otherwise do the full probe.
+ */
+ func = card->sdio_single_irq;
+ if (func && host->sdio_irq_pending) {
+ func->irq_handler(func);
+ return 1;
+ }
ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, &pending);
if (ret) {
- printk(KERN_DEBUG "%s: error %d reading SDIO_CCCR_INTx\n",
+ pr_debug("%s: error %d reading SDIO_CCCR_INTx\n",
mmc_card_id(card), ret);
return ret;
}
+ if (pending && mmc_card_broken_irq_polling(card) &&
+ !(host->caps & MMC_CAP_SDIO_IRQ)) {
+ unsigned char dummy;
+
+ /* A fake interrupt could be created when we poll SDIO_CCCR_INTx
+ * register with a Marvell SD8797 card. A dummy CMD52 read to
+ * function 0 register 0xff can avoid this.
+ */
+ mmc_io_rw_direct(card, 0, 0, 0xff, 0, &dummy);
+ }
+
count = 0;
for (i = 1; i <= 7; i++) {
if (pending & (1 << i)) {
- struct sdio_func *func = card->sdio_func[i - 1];
+ func = card->sdio_func[i - 1];
if (!func) {
- printk(KERN_WARNING "%s: pending IRQ for "
- "non-existant function\n",
+ pr_warning("%s: pending IRQ for "
+ "non-existent function\n",
mmc_card_id(card));
ret = -EINVAL;
} else if (func->irq_handler) {
func->irq_handler(func);
count++;
} else {
- printk(KERN_WARNING "%s: pending IRQ with no handler\n",
+ pr_warning("%s: pending IRQ with no handler\n",
sdio_func_id(func));
ret = -EINVAL;
}
@@ -63,6 +90,15 @@ static int process_sdio_pending_irqs(struct mmc_card *card)
return ret;
}
+void sdio_run_irqs(struct mmc_host *host)
+{
+ mmc_claim_host(host);
+ host->sdio_irq_pending = true;
+ process_sdio_pending_irqs(host);
+ mmc_release_host(host);
+}
+EXPORT_SYMBOL_GPL(sdio_run_irqs);
+
static int sdio_irq_thread(void *_host)
{
struct mmc_host *host = _host;
@@ -102,16 +138,20 @@ static int sdio_irq_thread(void *_host)
ret = __mmc_claim_host(host, &host->sdio_irq_thread_abort);
if (ret)
break;
- ret = process_sdio_pending_irqs(host->card);
+ ret = process_sdio_pending_irqs(host);
+ host->sdio_irq_pending = false;
mmc_release_host(host);
/*
* Give other threads a chance to run in the presence of
- * errors. FIXME: determine if due to card removal and
- * possibly exit this thread if so.
+ * errors.
*/
- if (ret < 0)
- ssleep(1);
+ if (ret < 0) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (!kthread_should_stop())
+ schedule_timeout(HZ);
+ set_current_state(TASK_RUNNING);
+ }
/*
* Adaptive polling frequency based on the assumption
@@ -128,16 +168,22 @@ static int sdio_irq_thread(void *_host)
}
}
- set_task_state(current, TASK_INTERRUPTIBLE);
- if (host->caps & MMC_CAP_SDIO_IRQ)
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (host->caps & MMC_CAP_SDIO_IRQ) {
+ mmc_host_clk_hold(host);
host->ops->enable_sdio_irq(host, 1);
+ mmc_host_clk_release(host);
+ }
if (!kthread_should_stop())
schedule_timeout(period);
- set_task_state(current, TASK_RUNNING);
+ set_current_state(TASK_RUNNING);
} while (!kthread_should_stop());
- if (host->caps & MMC_CAP_SDIO_IRQ)
+ if (host->caps & MMC_CAP_SDIO_IRQ) {
+ mmc_host_clk_hold(host);
host->ops->enable_sdio_irq(host, 0);
+ mmc_host_clk_release(host);
+ }
pr_debug("%s: IRQ thread exiting with code %d\n",
mmc_hostname(host), ret);
@@ -152,13 +198,20 @@ static int sdio_card_irq_get(struct mmc_card *card)
WARN_ON(!host->claimed);
if (!host->sdio_irqs++) {
- atomic_set(&host->sdio_irq_thread_abort, 0);
- host->sdio_irq_thread =
- kthread_run(sdio_irq_thread, host, "ksdiorqd");
- if (IS_ERR(host->sdio_irq_thread)) {
- int err = PTR_ERR(host->sdio_irq_thread);
- host->sdio_irqs--;
- return err;
+ if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
+ atomic_set(&host->sdio_irq_thread_abort, 0);
+ host->sdio_irq_thread =
+ kthread_run(sdio_irq_thread, host,
+ "ksdioirqd/%s", mmc_hostname(host));
+ if (IS_ERR(host->sdio_irq_thread)) {
+ int err = PTR_ERR(host->sdio_irq_thread);
+ host->sdio_irqs--;
+ return err;
+ }
+ } else {
+ mmc_host_clk_hold(host);
+ host->ops->enable_sdio_irq(host, 1);
+ mmc_host_clk_release(host);
}
}
@@ -173,13 +226,37 @@ static int sdio_card_irq_put(struct mmc_card *card)
BUG_ON(host->sdio_irqs < 1);
if (!--host->sdio_irqs) {
- atomic_set(&host->sdio_irq_thread_abort, 1);
- kthread_stop(host->sdio_irq_thread);
+ if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
+ atomic_set(&host->sdio_irq_thread_abort, 1);
+ kthread_stop(host->sdio_irq_thread);
+ } else {
+ mmc_host_clk_hold(host);
+ host->ops->enable_sdio_irq(host, 0);
+ mmc_host_clk_release(host);
+ }
}
return 0;
}
+/* If there is only 1 function registered set sdio_single_irq */
+static void sdio_single_irq_set(struct mmc_card *card)
+{
+ struct sdio_func *func;
+ int i;
+
+ card->sdio_single_irq = NULL;
+ if ((card->host->caps & MMC_CAP_SDIO_IRQ) &&
+ card->host->sdio_irqs == 1)
+ for (i = 0; i < card->sdio_funcs; i++) {
+ func = card->sdio_func[i];
+ if (func && func->irq_handler) {
+ card->sdio_single_irq = func;
+ break;
+ }
+ }
+}
+
/**
* sdio_claim_irq - claim the IRQ for a SDIO function
* @func: SDIO function
@@ -221,6 +298,7 @@ int sdio_claim_irq(struct sdio_func *func, sdio_irq_handler_t *handler)
ret = sdio_card_irq_get(func->card);
if (ret)
func->irq_handler = NULL;
+ sdio_single_irq_set(func->card);
return ret;
}
@@ -245,6 +323,7 @@ int sdio_release_irq(struct sdio_func *func)
if (func->irq_handler) {
func->irq_handler = NULL;
sdio_card_irq_put(func->card);
+ sdio_single_irq_set(func->card);
}
ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, &reg);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 06:39:59 +0000