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path: root/drivers/mmc/host/sdhci.c
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Diffstat (limited to 'drivers/mmc/host/sdhci.c')
-rw-r--r--drivers/mmc/host/sdhci.c99
1 files changed, 92 insertions, 7 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 5b29d62e0cbf..72b9476ff012 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1,7 +1,7 @@
/*
* linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
*
- * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
+ * Copyright (C) 2005-2011 Pierre Ossman, All Rights Reserved.
*
* 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
@@ -25,10 +25,12 @@
#include <linux/mmc/mmc.h>
#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
#include "sdhci.h"
#define DRIVER_NAME "sdhci"
+#define CLK_TIMEOUT (10 * HZ)
#define DBG(f, x...) \
pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
@@ -46,6 +48,48 @@ static void sdhci_finish_data(struct sdhci_host *);
static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
static void sdhci_finish_command(struct sdhci_host *);
+static void sdhci_clk_worker(struct work_struct *work)
+{
+ unsigned long flags;
+ struct sdhci_host *host =
+ container_of(work, struct sdhci_host, clk_worker.work);
+
+ spin_lock_irqsave(&host->lock, flags);
+ if (host->ops->platform_clk_ctrl && host->clk_status)
+ host->ops->platform_clk_ctrl(host, false);
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static inline bool sdhci_is_sdio_attached(struct sdhci_host *host)
+{
+ struct mmc_card *card = host->mmc->card;
+
+ if (card && card->sdio_func[0])
+ return true;
+ return false;
+}
+
+static void sdhci_enable_clk(struct sdhci_host *host)
+{
+ if (host->clk_mgr_en) {
+ if (!in_interrupt())
+ cancel_delayed_work(&host->clk_worker);
+ if (!host->clk_status && host->ops->platform_clk_ctrl)
+ host->ops->platform_clk_ctrl(host, true);
+ }
+}
+
+static void sdhci_disable_clk(struct sdhci_host *host, int delay)
+{
+ if (host->clk_mgr_en && !sdhci_is_sdio_attached(host)) {
+ if (delay == 0 && !in_interrupt()) {
+ if (host->ops->platform_clk_ctrl && host->clk_status)
+ host->ops->platform_clk_ctrl(host, false);
+ } else
+ schedule_delayed_work(&host->clk_worker, delay);
+ }
+}
+
static void sdhci_dumpregs(struct sdhci_host *host)
{
printk(KERN_DEBUG DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
@@ -235,12 +279,14 @@ static void sdhci_led_control(struct led_classdev *led,
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
+ sdhci_enable_clk(host);
if (brightness == LED_OFF)
sdhci_deactivate_led(host);
else
sdhci_activate_led(host);
+ sdhci_disable_clk(host, CLK_TIMEOUT);
spin_unlock_irqrestore(&host->lock, flags);
}
#endif
@@ -1139,6 +1185,7 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
}
host->mrq = mrq;
+ sdhci_enable_clk(host);
/* If polling, assume that the card is always present. */
if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
@@ -1166,6 +1213,7 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
host = mmc_priv(mmc);
spin_lock_irqsave(&host->lock, flags);
+ sdhci_enable_clk(host);
if (host->flags & SDHCI_DEVICE_DEAD)
goto out;
@@ -1241,6 +1289,9 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
out:
mmiowb();
+ if (ios->power_mode == MMC_POWER_OFF)
+ sdhci_disable_clk(host, 0);
+
spin_unlock_irqrestore(&host->lock, flags);
}
@@ -1253,6 +1304,7 @@ static int sdhci_get_ro(struct mmc_host *mmc)
host = mmc_priv(mmc);
spin_lock_irqsave(&host->lock, flags);
+ sdhci_enable_clk(host);
if (host->flags & SDHCI_DEVICE_DEAD)
is_readonly = 0;
@@ -1277,6 +1329,7 @@ static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
host = mmc_priv(mmc);
spin_lock_irqsave(&host->lock, flags);
+ sdhci_enable_clk(host);
if (host->flags & SDHCI_DEVICE_DEAD)
goto out;
@@ -1313,6 +1366,9 @@ static void sdhci_tasklet_card(unsigned long param)
spin_lock_irqsave(&host->lock, flags);
+ if (host->clk_mgr_en)
+ goto out;
+
if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
if (host->mrq) {
printk(KERN_ERR "%s: Card removed during transfer!\n",
@@ -1327,7 +1383,7 @@ static void sdhci_tasklet_card(unsigned long param)
tasklet_schedule(&host->finish_tasklet);
}
}
-
+out:
spin_unlock_irqrestore(&host->lock, flags);
mmc_detect_change(host->mmc, msecs_to_jiffies(200));
@@ -1382,6 +1438,7 @@ static void sdhci_tasklet_finish(unsigned long param)
#endif
mmiowb();
+ sdhci_disable_clk(host, CLK_TIMEOUT);
spin_unlock_irqrestore(&host->lock, flags);
mmc_request_done(host->mmc, mrq);
@@ -1662,17 +1719,24 @@ int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
{
int ret;
+ sdhci_enable_clk(host);
sdhci_disable_card_detection(host);
ret = mmc_suspend_host(host->mmc);
if (ret)
- return ret;
+ goto out;
free_irq(host->irq, host);
if (host->vmmc)
ret = regulator_disable(host->vmmc);
+out:
+ /* sync worker
+ * mmc_suspend_host may disable the clk
+ */
+ sdhci_enable_clk(host);
+ sdhci_disable_clk(host, 0);
return ret;
}
@@ -1688,7 +1752,7 @@ int sdhci_resume_host(struct sdhci_host *host)
return ret;
}
-
+ sdhci_enable_clk(host);
if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
if (host->ops->enable_dma)
host->ops->enable_dma(host);
@@ -1697,14 +1761,21 @@ int sdhci_resume_host(struct sdhci_host *host)
ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
mmc_hostname(host->mmc), host);
if (ret)
- return ret;
+ goto out;
sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
mmiowb();
ret = mmc_resume_host(host->mmc);
+
+ /* mmc_resume_host may disable the clk */
+ sdhci_enable_clk(host);
sdhci_enable_card_detection(host);
+out:
+ /* sync worker */
+ sdhci_disable_clk(host, 0);
+
return ret;
}
@@ -1713,9 +1784,12 @@ EXPORT_SYMBOL_GPL(sdhci_resume_host);
void sdhci_enable_irq_wakeups(struct sdhci_host *host)
{
u8 val;
+
+ sdhci_enable_clk(host);
val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
val |= SDHCI_WAKE_ON_INT;
sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
+ sdhci_disable_clk(host, CLK_TIMEOUT);
}
EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
@@ -1763,6 +1837,10 @@ int sdhci_add_host(struct sdhci_host *host)
if (debug_quirks)
host->quirks = debug_quirks;
+ if (host->clk_mgr_en)
+ INIT_DELAYED_WORK(&host->clk_worker, sdhci_clk_worker);
+
+ sdhci_enable_clk(host);
sdhci_reset(host, SDHCI_RESET_ALL);
host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
@@ -1853,6 +1931,7 @@ int sdhci_add_host(struct sdhci_host *host)
printk(KERN_ERR
"%s: Hardware doesn't specify base clock "
"frequency.\n", mmc_hostname(mmc));
+ sdhci_disable_clk(host, 0);
return -ENODEV;
}
host->max_clk = host->ops->get_max_clock(host);
@@ -1868,6 +1947,7 @@ int sdhci_add_host(struct sdhci_host *host)
printk(KERN_ERR
"%s: Hardware doesn't specify timeout clock "
"frequency.\n", mmc_hostname(mmc));
+ sdhci_disable_clk(host, 0);
return -ENODEV;
}
}
@@ -1929,6 +2009,7 @@ int sdhci_add_host(struct sdhci_host *host)
if (mmc->ocr_avail == 0) {
printk(KERN_ERR "%s: Hardware doesn't report any "
"support voltages.\n", mmc_hostname(mmc));
+ sdhci_disable_clk(host, 0);
return -ENODEV;
}
@@ -2043,7 +2124,7 @@ int sdhci_add_host(struct sdhci_host *host)
(host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
sdhci_enable_card_detection(host);
-
+ sdhci_disable_clk(host, CLK_TIMEOUT);
return 0;
#ifdef SDHCI_USE_LEDS_CLASS
@@ -2054,7 +2135,7 @@ reset:
untasklet:
tasklet_kill(&host->card_tasklet);
tasklet_kill(&host->finish_tasklet);
-
+ sdhci_disable_clk(host, 0);
return ret;
}
@@ -2074,12 +2155,14 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
" transfer!\n", mmc_hostname(host->mmc));
host->mrq->cmd->error = -ENOMEDIUM;
+ sdhci_enable_clk(host);
tasklet_schedule(&host->finish_tasklet);
}
spin_unlock_irqrestore(&host->lock, flags);
}
+ sdhci_enable_clk(host);
sdhci_disable_card_detection(host);
mmc_remove_host(host->mmc);
@@ -2088,8 +2171,10 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
led_classdev_unregister(&host->led);
#endif
+ sdhci_enable_clk(host);
if (!dead)
sdhci_reset(host, SDHCI_RESET_ALL);
+ sdhci_disable_clk(host, 0);
free_irq(host->irq, host);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-16 09:39:05 +0000