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mmc: tmio_mmc: support the generic MMC GPIO card hotplug helper

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If the platform specifies the TMIO_MMC_HAS_COLD_CD flag, use the generic
MMC GPIO card hotplug helper.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Guennadi Liakhovetski 2012-02-09 22:57:09 +01:00 committed by Chris Ball
parent 2b1ac5c2ca
commit c8be24c2af
3 changed files with 50 additions and 48 deletions
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4
drivers/mmc/host/tmio_mmc.h
View file

@ -53,10 +53,6 @@ struct tmio_mmc_host {
void (*set_pwr)(struct platform_device *host, int state);
void (*set_clk_div)(struct platform_device *host, int state);
int pm_error;
/* recognise system-wide suspend in runtime PM methods */
bool pm_global;
/* pio related stuff */
struct scatterlist *sg_ptr;
struct scatterlist *sg_orig;

69
drivers/mmc/host/tmio_mmc_pio.c
View file

@ -34,6 +34,7 @@
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/cd-gpio.h>
#include <linux/mmc/host.h>
#include <linux/mmc/tmio.h>
#include <linux/module.h>
@ -791,8 +792,10 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
spin_unlock_irqrestore(&host->lock, flags);
/*
* pdata->power == false only if COLD_CD is available, otherwise only
* in short time intervals during probing or resuming
* pdata->power toggles between false and true in both cases - either
* or not the controller can be runtime-suspended during inactivity.
* But if the controller has to be kept on, the runtime-pm usage_count
* is kept positive, so no suspending actually takes place.
*/
if (ios->power_mode == MMC_POWER_ON && ios->clock) {
if (!pdata->power) {
@ -916,7 +919,7 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host,
else
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
_host->native_hotplug = !(pdata->flags & TMIO_MMC_HAS_COLD_CD ||
_host->native_hotplug = !(pdata->flags & TMIO_MMC_USE_GPIO_CD ||
mmc->caps & MMC_CAP_NEEDS_POLL ||
mmc->caps & MMC_CAP_NONREMOVABLE);
@ -933,8 +936,9 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host,
* 3) a worker thread polls the sdhi - indicated by MMC_CAP_NEEDS_POLL
* 4) the medium is non-removable - indicated by MMC_CAP_NONREMOVABLE
*
* While we increment the rtpm counter for all scenarios when the mmc
* core activates us by calling an appropriate set_ios(), we must
* While we increment the runtime PM counter for all scenarios when
* the mmc core activates us by calling an appropriate set_ios(), we
* must additionally ensure that in case 2) the tmio mmc hardware stays
* additionally ensure that in case 2) the tmio mmc hardware stays
* powered on during runtime for the card detection to work.
*/
@ -973,6 +977,14 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host,
tmio_mmc_enable_mmc_irqs(_host, irq_mask);
if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
ret = mmc_cd_gpio_request(mmc, pdata->cd_gpio);
if (ret < 0) {
tmio_mmc_host_remove(_host);
return ret;
}
}
*host = _host;
return 0;
@ -990,20 +1002,22 @@ EXPORT_SYMBOL(tmio_mmc_host_probe);
void tmio_mmc_host_remove(struct tmio_mmc_host *host)
{
struct platform_device *pdev = host->pdev;
struct tmio_mmc_data *pdata = host->pdata;
struct mmc_host *mmc = host->mmc;
if (pdata->flags & TMIO_MMC_USE_GPIO_CD)
/*
* This means we can miss a card-eject, but this is anyway
* possible, because of delayed processing of hotplug events.
*/
mmc_cd_gpio_free(mmc);
/*
* We don't have to manipulate pdata->power here: if there is a card in
* the slot, the runtime PM is active and our .runtime_resume() will not
* be run. If there is no card in the slot and the platform can suspend
* the controller, the runtime PM is suspended and pdata->power == false,
* so, our .runtime_resume() will not try to detect a card in the slot.
*/
if (!host->native_hotplug)
pm_runtime_get_sync(&pdev->dev);
dev_pm_qos_hide_latency_limit(&pdev->dev);
mmc_remove_host(host->mmc);
mmc_remove_host(mmc);
cancel_work_sync(&host->done);
cancel_delayed_work_sync(&host->delayed_reset_work);
tmio_mmc_release_dma(host);
@ -1012,7 +1026,7 @@ void tmio_mmc_host_remove(struct tmio_mmc_host *host)
pm_runtime_disable(&pdev->dev);
iounmap(host->ctl);
mmc_free_host(host->mmc);
mmc_free_host(mmc);
}
EXPORT_SYMBOL(tmio_mmc_host_remove);
@ -1026,8 +1040,6 @@ int tmio_mmc_host_suspend(struct device *dev)
if (!ret)
tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
host->pm_error = pm_runtime_put_sync(dev);
return ret;
}
EXPORT_SYMBOL(tmio_mmc_host_suspend);
@ -1037,20 +1049,10 @@ int tmio_mmc_host_resume(struct device *dev)
struct mmc_host *mmc = dev_get_drvdata(dev);
struct tmio_mmc_host *host = mmc_priv(mmc);
tmio_mmc_reset(host);
tmio_mmc_enable_dma(host, true);
/* The MMC core will perform the complete set up */
host->pdata->power = false;
host->pm_global = true;
if (!host->pm_error)
pm_runtime_get_sync(dev);
if (host->pm_global) {
/* Runtime PM resume callback didn't run */
tmio_mmc_reset(host);
tmio_mmc_enable_dma(host, true);
host->pm_global = false;
}
return mmc_resume_host(mmc);
}
EXPORT_SYMBOL(tmio_mmc_host_resume);
@ -1067,19 +1069,10 @@ int tmio_mmc_host_runtime_resume(struct device *dev)
{
struct mmc_host *mmc = dev_get_drvdata(dev);
struct tmio_mmc_host *host = mmc_priv(mmc);
struct tmio_mmc_data *pdata = host->pdata;
tmio_mmc_reset(host);
tmio_mmc_enable_dma(host, true);
if (pdata->power) {
/* Only entered after a card-insert interrupt */
if (!mmc->card)
tmio_mmc_set_ios(mmc, &mmc->ios);
mmc_detect_change(mmc, msecs_to_jiffies(100));
}
host->pm_global = false;
return 0;
}
EXPORT_SYMBOL(tmio_mmc_host_runtime_resume);

25
include/linux/mfd/tmio.h
View file

@ -1,8 +1,10 @@
#ifndef MFD_TMIO_H
#define MFD_TMIO_H
#include <linux/device.h>
#include <linux/fb.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
@ -64,8 +66,8 @@
#define TMIO_MMC_SDIO_IRQ (1 << 2)
/*
* Some platforms can detect card insertion events with controller powered
* down, in which case they have to call tmio_mmc_cd_wakeup() to power up the
* controller and report the event to the driver.
* down, using a GPIO IRQ, in which case they have to fill in cd_irq, cd_gpio,
* and cd_flags fields of struct tmio_mmc_data.
*/
#define TMIO_MMC_HAS_COLD_CD (1 << 3)
/*
@ -73,6 +75,12 @@
* idle before writing to some registers.
*/
#define TMIO_MMC_HAS_IDLE_WAIT (1 << 4)
/*
* A GPIO is used for card hotplug detection. We need an extra flag for this,
* because 0 is a valid GPIO number too, and requiring users to specify
* cd_gpio < 0 to disable GPIO hotplug would break backwards compatibility.
*/
#define TMIO_MMC_USE_GPIO_CD (1 << 5)
int tmio_core_mmc_enable(void __iomem *cnf, int shift, unsigned long base);
int tmio_core_mmc_resume(void __iomem *cnf, int shift, unsigned long base);
@ -98,18 +106,23 @@ struct tmio_mmc_data {
struct tmio_mmc_dma *dma;
struct device *dev;
bool power;
unsigned int cd_gpio;
void (*set_pwr)(struct platform_device *host, int state);
void (*set_clk_div)(struct platform_device *host, int state);
int (*get_cd)(struct platform_device *host);
int (*write16_hook)(struct tmio_mmc_host *host, int addr);
};
/*
* This function is deprecated and will be removed soon. Please, convert your
* platform to use drivers/mmc/core/cd-gpio.c
*/
#include <linux/mmc/host.h>
static inline void tmio_mmc_cd_wakeup(struct tmio_mmc_data *pdata)
{
if (pdata && !pdata->power) {
pdata->power = true;
pm_runtime_get(pdata->dev);
}
if (pdata)
mmc_detect_change(dev_get_drvdata(pdata->dev),
msecs_to_jiffies(100));
}
/*