mmc: atmel-mci: add runtime pm support
Add runtime pm support to atmel mci controller. Use runtime pm APIs to enable/disable atmel mci's clock. Use runtime autosuspend APIs to enable auto suspend delay. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> Acked-by: Ludovic Desroches <ludovic.desroches@atmel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> [Ulf: Fixed compile error]
This commit is contained in:
Wenyou Yang
Ulf Hansson
parent
3ee14bf79d
commit
ae552ab02c
|
|
@ -37,6 +37,8 @@
|
|||
|
||||
#include <linux/atmel-mci.h>
|
||||
#include <linux/atmel_pdc.h>
|
||||
#include <linux/pm.h>
|
||||
#include <linux/pm_runtime.h>
|
||||
|
||||
#include <asm/cacheflush.h>
|
||||
#include <asm/io.h>
|
||||
|
|
@ -44,6 +46,8 @@
|
|||
|
||||
#include "atmel-mci-regs.h"
|
||||
|
||||
#define AUTOSUSPEND_DELAY 50
|
||||
|
||||
#define ATMCI_DATA_ERROR_FLAGS (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
|
||||
#define ATMCI_DMA_THRESHOLD 16
|
||||
|
||||
|
|
@ -386,20 +390,19 @@ static int atmci_regs_show(struct seq_file *s, void *v)
|
|||
if (!buf)
|
||||
return -ENOMEM;
|
||||
|
||||
pm_runtime_get_sync(&host->pdev->dev);
|
||||
|
||||
/*
|
||||
* Grab a more or less consistent snapshot. Note that we're
|
||||
* not disabling interrupts, so IMR and SR may not be
|
||||
* consistent.
|
||||
*/
|
||||
ret = clk_prepare_enable(host->mck);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
spin_lock_bh(&host->lock);
|
||||
memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
|
||||
spin_unlock_bh(&host->lock);
|
||||
|
||||
clk_disable_unprepare(host->mck);
|
||||
pm_runtime_mark_last_busy(&host->pdev->dev);
|
||||
pm_runtime_put_autosuspend(&host->pdev->dev);
|
||||
|
||||
seq_printf(s, "MR:\t0x%08x%s%s ",
|
||||
buf[ATMCI_MR / 4],
|
||||
|
|
@ -449,7 +452,6 @@ static int atmci_regs_show(struct seq_file *s, void *v)
|
|||
val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
|
||||
}
|
||||
|
||||
out:
|
||||
kfree(buf);
|
||||
|
||||
return ret;
|
||||
|
|
@ -1255,6 +1257,8 @@ static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|||
WARN_ON(slot->mrq);
|
||||
dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
|
||||
|
||||
pm_runtime_get_sync(&host->pdev->dev);
|
||||
|
||||
/*
|
||||
* We may "know" the card is gone even though there's still an
|
||||
* electrical connection. If so, we really need to communicate
|
||||
|
|
@ -1284,7 +1288,8 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|||
struct atmel_mci_slot *slot = mmc_priv(mmc);
|
||||
struct atmel_mci *host = slot->host;
|
||||
unsigned int i;
|
||||
bool unprepare_clk;
|
||||
|
||||
pm_runtime_get_sync(&host->pdev->dev);
|
||||
|
||||
slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
|
||||
switch (ios->bus_width) {
|
||||
|
|
@ -1300,13 +1305,8 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|||
unsigned int clock_min = ~0U;
|
||||
u32 clkdiv;
|
||||
|
||||
clk_prepare(host->mck);
|
||||
unprepare_clk = true;
|
||||
|
||||
spin_lock_bh(&host->lock);
|
||||
if (!host->mode_reg) {
|
||||
clk_enable(host->mck);
|
||||
unprepare_clk = false;
|
||||
atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
|
||||
atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
|
||||
if (host->caps.has_cfg_reg)
|
||||
|
|
@ -1374,8 +1374,6 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|||
} else {
|
||||
bool any_slot_active = false;
|
||||
|
||||
unprepare_clk = false;
|
||||
|
||||
spin_lock_bh(&host->lock);
|
||||
slot->clock = 0;
|
||||
for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
|
||||
|
|
@ -1388,17 +1386,12 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|||
atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
|
||||
if (host->mode_reg) {
|
||||
atmci_readl(host, ATMCI_MR);
|
||||
clk_disable(host->mck);
|
||||
unprepare_clk = true;
|
||||
}
|
||||
host->mode_reg = 0;
|
||||
}
|
||||
spin_unlock_bh(&host->lock);
|
||||
}
|
||||
|
||||
if (unprepare_clk)
|
||||
clk_unprepare(host->mck);
|
||||
|
||||
switch (ios->power_mode) {
|
||||
case MMC_POWER_OFF:
|
||||
if (!IS_ERR(mmc->supply.vmmc))
|
||||
|
|
@ -1424,6 +1417,9 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|||
*/
|
||||
break;
|
||||
}
|
||||
|
||||
pm_runtime_mark_last_busy(&host->pdev->dev);
|
||||
pm_runtime_put_autosuspend(&host->pdev->dev);
|
||||
}
|
||||
|
||||
static int atmci_get_ro(struct mmc_host *mmc)
|
||||
|
|
@ -1515,6 +1511,9 @@ static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
|
|||
spin_unlock(&host->lock);
|
||||
mmc_request_done(prev_mmc, mrq);
|
||||
spin_lock(&host->lock);
|
||||
|
||||
pm_runtime_mark_last_busy(&host->pdev->dev);
|
||||
pm_runtime_put_autosuspend(&host->pdev->dev);
|
||||
}
|
||||
|
||||
static void atmci_command_complete(struct atmel_mci *host,
|
||||
|
|
@ -2424,15 +2423,16 @@ static int __init atmci_probe(struct platform_device *pdev)
|
|||
|
||||
atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
|
||||
host->bus_hz = clk_get_rate(host->mck);
|
||||
clk_disable_unprepare(host->mck);
|
||||
|
||||
host->mapbase = regs->start;
|
||||
|
||||
tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
|
||||
|
||||
ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
|
||||
if (ret)
|
||||
if (ret) {
|
||||
clk_disable_unprepare(host->mck);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Get MCI capabilities and set operations according to it */
|
||||
atmci_get_cap(host);
|
||||
|
|
@ -2456,6 +2456,12 @@ static int __init atmci_probe(struct platform_device *pdev)
|
|||
|
||||
setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host);
|
||||
|
||||
pm_runtime_get_noresume(&pdev->dev);
|
||||
pm_runtime_set_active(&pdev->dev);
|
||||
pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_DELAY);
|
||||
pm_runtime_use_autosuspend(&pdev->dev);
|
||||
pm_runtime_enable(&pdev->dev);
|
||||
|
||||
/* We need at least one slot to succeed */
|
||||
nr_slots = 0;
|
||||
ret = -ENODEV;
|
||||
|
|
@ -2498,6 +2504,9 @@ static int __init atmci_probe(struct platform_device *pdev)
|
|||
"Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
|
||||
host->mapbase, irq, nr_slots);
|
||||
|
||||
pm_runtime_mark_last_busy(&host->pdev->dev);
|
||||
pm_runtime_put_autosuspend(&pdev->dev);
|
||||
|
||||
return 0;
|
||||
|
||||
err_dma_alloc:
|
||||
|
|
@ -2506,6 +2515,11 @@ err_dma_alloc:
|
|||
atmci_cleanup_slot(host->slot[i], i);
|
||||
}
|
||||
err_init_slot:
|
||||
clk_disable_unprepare(host->mck);
|
||||
|
||||
pm_runtime_disable(&pdev->dev);
|
||||
pm_runtime_put_noidle(&pdev->dev);
|
||||
|
||||
del_timer_sync(&host->timer);
|
||||
if (host->dma.chan)
|
||||
dma_release_channel(host->dma.chan);
|
||||
|
|
@ -2518,6 +2532,8 @@ static int __exit atmci_remove(struct platform_device *pdev)
|
|||
struct atmel_mci *host = platform_get_drvdata(pdev);
|
||||
unsigned int i;
|
||||
|
||||
pm_runtime_get_sync(&pdev->dev);
|
||||
|
||||
if (host->buffer)
|
||||
dma_free_coherent(&pdev->dev, host->buf_size,
|
||||
host->buffer, host->buf_phys_addr);
|
||||
|
|
@ -2527,11 +2543,9 @@ static int __exit atmci_remove(struct platform_device *pdev)
|
|||
atmci_cleanup_slot(host->slot[i], i);
|
||||
}
|
||||
|
||||
clk_prepare_enable(host->mck);
|
||||
atmci_writel(host, ATMCI_IDR, ~0UL);
|
||||
atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
|
||||
atmci_readl(host, ATMCI_SR);
|
||||
clk_disable_unprepare(host->mck);
|
||||
|
||||
del_timer_sync(&host->timer);
|
||||
if (host->dma.chan)
|
||||
|
|
@ -2539,14 +2553,44 @@ static int __exit atmci_remove(struct platform_device *pdev)
|
|||
|
||||
free_irq(platform_get_irq(pdev, 0), host);
|
||||
|
||||
clk_disable_unprepare(host->mck);
|
||||
|
||||
pm_runtime_disable(&pdev->dev);
|
||||
pm_runtime_put_noidle(&pdev->dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int atmci_runtime_suspend(struct device *dev)
|
||||
{
|
||||
struct atmel_mci *host = dev_get_drvdata(dev);
|
||||
|
||||
clk_disable_unprepare(host->mck);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int atmci_runtime_resume(struct device *dev)
|
||||
{
|
||||
struct atmel_mci *host = dev_get_drvdata(dev);
|
||||
|
||||
return clk_prepare_enable(host->mck);
|
||||
}
|
||||
#endif
|
||||
|
||||
static const struct dev_pm_ops atmci_dev_pm_ops = {
|
||||
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
|
||||
pm_runtime_force_resume)
|
||||
SET_PM_RUNTIME_PM_OPS(atmci_runtime_suspend, atmci_runtime_resume, NULL)
|
||||
};
|
||||
|
||||
static struct platform_driver atmci_driver = {
|
||||
.remove = __exit_p(atmci_remove),
|
||||
.driver = {
|
||||
.name = "atmel_mci",
|
||||
.of_match_table = of_match_ptr(atmci_dt_ids),
|
||||
.pm = &atmci_dev_pm_ops,
|
||||
},
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue