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]hifive-unleashed-5.1
Wenyou Yang
Ulf Hansson
parent
3ee14bf79d
commit
ae552ab02c
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@ -37,6 +37,8 @@
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#include <linux/atmel-mci.h>
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#include <linux/atmel_pdc.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <asm/cacheflush.h>
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#include <asm/io.h>
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@ -44,6 +46,8 @@
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#include "atmel-mci-regs.h"
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#define AUTOSUSPEND_DELAY 50
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#define ATMCI_DATA_ERROR_FLAGS (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
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#define ATMCI_DMA_THRESHOLD 16
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@ -386,20 +390,19 @@ static int atmci_regs_show(struct seq_file *s, void *v)
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if (!buf)
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return -ENOMEM;
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pm_runtime_get_sync(&host->pdev->dev);
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/*
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* Grab a more or less consistent snapshot. Note that we're
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* not disabling interrupts, so IMR and SR may not be
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* consistent.
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*/
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ret = clk_prepare_enable(host->mck);
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if (ret)
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goto out;
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spin_lock_bh(&host->lock);
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memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
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spin_unlock_bh(&host->lock);
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clk_disable_unprepare(host->mck);
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pm_runtime_mark_last_busy(&host->pdev->dev);
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pm_runtime_put_autosuspend(&host->pdev->dev);
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seq_printf(s, "MR:\t0x%08x%s%s ",
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buf[ATMCI_MR / 4],
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@ -449,7 +452,6 @@ static int atmci_regs_show(struct seq_file *s, void *v)
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val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
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}
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out:
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kfree(buf);
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return ret;
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@ -1255,6 +1257,8 @@ static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
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WARN_ON(slot->mrq);
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dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
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pm_runtime_get_sync(&host->pdev->dev);
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/*
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* We may "know" the card is gone even though there's still an
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* electrical connection. If so, we really need to communicate
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@ -1284,7 +1288,8 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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struct atmel_mci_slot *slot = mmc_priv(mmc);
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struct atmel_mci *host = slot->host;
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unsigned int i;
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bool unprepare_clk;
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pm_runtime_get_sync(&host->pdev->dev);
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slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
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switch (ios->bus_width) {
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@ -1300,13 +1305,8 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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unsigned int clock_min = ~0U;
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u32 clkdiv;
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clk_prepare(host->mck);
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unprepare_clk = true;
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spin_lock_bh(&host->lock);
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if (!host->mode_reg) {
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clk_enable(host->mck);
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unprepare_clk = false;
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atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
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atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
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if (host->caps.has_cfg_reg)
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@ -1374,8 +1374,6 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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} else {
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bool any_slot_active = false;
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unprepare_clk = false;
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spin_lock_bh(&host->lock);
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slot->clock = 0;
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for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
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@ -1388,17 +1386,12 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
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if (host->mode_reg) {
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atmci_readl(host, ATMCI_MR);
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clk_disable(host->mck);
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unprepare_clk = true;
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}
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host->mode_reg = 0;
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}
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spin_unlock_bh(&host->lock);
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}
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if (unprepare_clk)
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clk_unprepare(host->mck);
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switch (ios->power_mode) {
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case MMC_POWER_OFF:
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if (!IS_ERR(mmc->supply.vmmc))
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@ -1424,6 +1417,9 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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*/
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break;
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}
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pm_runtime_mark_last_busy(&host->pdev->dev);
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pm_runtime_put_autosuspend(&host->pdev->dev);
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}
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static int atmci_get_ro(struct mmc_host *mmc)
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@ -1515,6 +1511,9 @@ static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
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spin_unlock(&host->lock);
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mmc_request_done(prev_mmc, mrq);
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spin_lock(&host->lock);
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pm_runtime_mark_last_busy(&host->pdev->dev);
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pm_runtime_put_autosuspend(&host->pdev->dev);
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}
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static void atmci_command_complete(struct atmel_mci *host,
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@ -2424,15 +2423,16 @@ static int __init atmci_probe(struct platform_device *pdev)
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atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
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host->bus_hz = clk_get_rate(host->mck);
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clk_disable_unprepare(host->mck);
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host->mapbase = regs->start;
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tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
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ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
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if (ret)
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if (ret) {
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clk_disable_unprepare(host->mck);
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return ret;
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}
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/* Get MCI capabilities and set operations according to it */
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atmci_get_cap(host);
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@ -2456,6 +2456,12 @@ static int __init atmci_probe(struct platform_device *pdev)
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setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host);
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pm_runtime_get_noresume(&pdev->dev);
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_DELAY);
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pm_runtime_use_autosuspend(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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/* We need at least one slot to succeed */
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nr_slots = 0;
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ret = -ENODEV;
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@ -2498,6 +2504,9 @@ static int __init atmci_probe(struct platform_device *pdev)
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"Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
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host->mapbase, irq, nr_slots);
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pm_runtime_mark_last_busy(&host->pdev->dev);
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pm_runtime_put_autosuspend(&pdev->dev);
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return 0;
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err_dma_alloc:
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@ -2506,6 +2515,11 @@ err_dma_alloc:
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atmci_cleanup_slot(host->slot[i], i);
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}
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err_init_slot:
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clk_disable_unprepare(host->mck);
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pm_runtime_disable(&pdev->dev);
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pm_runtime_put_noidle(&pdev->dev);
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del_timer_sync(&host->timer);
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if (host->dma.chan)
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dma_release_channel(host->dma.chan);
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@ -2518,6 +2532,8 @@ static int __exit atmci_remove(struct platform_device *pdev)
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struct atmel_mci *host = platform_get_drvdata(pdev);
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unsigned int i;
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pm_runtime_get_sync(&pdev->dev);
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if (host->buffer)
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dma_free_coherent(&pdev->dev, host->buf_size,
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host->buffer, host->buf_phys_addr);
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@ -2527,11 +2543,9 @@ static int __exit atmci_remove(struct platform_device *pdev)
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atmci_cleanup_slot(host->slot[i], i);
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}
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clk_prepare_enable(host->mck);
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atmci_writel(host, ATMCI_IDR, ~0UL);
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atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
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atmci_readl(host, ATMCI_SR);
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clk_disable_unprepare(host->mck);
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del_timer_sync(&host->timer);
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if (host->dma.chan)
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@ -2539,14 +2553,44 @@ static int __exit atmci_remove(struct platform_device *pdev)
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free_irq(platform_get_irq(pdev, 0), host);
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clk_disable_unprepare(host->mck);
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pm_runtime_disable(&pdev->dev);
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pm_runtime_put_noidle(&pdev->dev);
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return 0;
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}
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#ifdef CONFIG_PM
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static int atmci_runtime_suspend(struct device *dev)
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{
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struct atmel_mci *host = dev_get_drvdata(dev);
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clk_disable_unprepare(host->mck);
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return 0;
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}
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static int atmci_runtime_resume(struct device *dev)
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{
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struct atmel_mci *host = dev_get_drvdata(dev);
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return clk_prepare_enable(host->mck);
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}
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#endif
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static const struct dev_pm_ops atmci_dev_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
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pm_runtime_force_resume)
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SET_PM_RUNTIME_PM_OPS(atmci_runtime_suspend, atmci_runtime_resume, NULL)
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};
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static struct platform_driver atmci_driver = {
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.remove = __exit_p(atmci_remove),
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.driver = {
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.name = "atmel_mci",
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.of_match_table = of_match_ptr(atmci_dt_ids),
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.pm = &atmci_dev_pm_ops,
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},
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};
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