From 13189e78caa824f0285b1823519c020591641207 Mon Sep 17 00:00:00 2001 From: Jarkko Lavinen Date: Tue, 22 Sep 2009 16:44:53 -0700 Subject: [PATCH] omap_hsmmc: add mmc card sleep and awake support After 1 second of inactivity, put card and/or regulator to sleep. After 8 seconds of inactivity, turn off the power. Signed-off-by: Jarkko Lavinen Signed-off-by: Adrian Hunter Acked-by: Matt Fleming Cc: Ian Molton Cc: "Roberto A. Foglietta" Cc: Jarkko Lavinen Cc: Denis Karpov Cc: Pierre Ossman Cc: Philip Langdale Cc: "Madhusudhan" Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/mmc/host/omap_hsmmc.c | 162 +++++++++++++++++++++++------------------- 1 file changed, 88 insertions(+), 74 deletions(-) diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index c82ec7f..b83f7a4 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -115,7 +116,8 @@ /* Timeouts for entering power saving states on inactivity, msec */ #define OMAP_MMC_DISABLED_TIMEOUT 100 -#define OMAP_MMC_OFF_TIMEOUT 1000 +#define OMAP_MMC_SLEEP_TIMEOUT 1000 +#define OMAP_MMC_OFF_TIMEOUT 8000 /* * One controller can have multiple slots, like on some omap boards using @@ -1182,20 +1184,21 @@ static void omap_hsmmc_init(struct mmc_omap_host *host) /* * Dynamic power saving handling, FSM: - * ENABLED -> DISABLED -> OFF / REGSLEEP - * ^___________| | - * |______________________| + * ENABLED -> DISABLED -> CARDSLEEP / REGSLEEP -> OFF + * ^___________| | | + * |______________________|______________________| * * ENABLED: mmc host is fully functional * DISABLED: fclk is off - * OFF: fclk is off,voltage regulator is off - * REGSLEEP: fclk is off,voltage regulator is asleep + * CARDSLEEP: fclk is off, card is asleep, voltage regulator is asleep + * REGSLEEP: fclk is off, voltage regulator is asleep + * OFF: fclk is off, voltage regulator is off * * Transition handlers return the timeout for the next state transition * or negative error. */ -enum {ENABLED = 0, DISABLED, REGSLEEP, OFF}; +enum {ENABLED = 0, DISABLED, CARDSLEEP, REGSLEEP, OFF}; /* Handler for [ENABLED -> DISABLED] transition */ static int omap_mmc_enabled_to_disabled(struct mmc_omap_host *host) @@ -1209,46 +1212,72 @@ static int omap_mmc_enabled_to_disabled(struct mmc_omap_host *host) if (host->power_mode == MMC_POWER_OFF) return 0; - return msecs_to_jiffies(OMAP_MMC_OFF_TIMEOUT); + return msecs_to_jiffies(OMAP_MMC_SLEEP_TIMEOUT); } -/* Handler for [DISABLED -> OFF] transition */ -static int omap_mmc_disabled_to_off(struct mmc_omap_host *host) +/* Handler for [DISABLED -> REGSLEEP / CARDSLEEP] transition */ +static int omap_mmc_disabled_to_sleep(struct mmc_omap_host *host) { - int new_state; - - dev_dbg(mmc_dev(host->mmc), "DISABLED -> OFF\n"); + int err, new_state; if (!mmc_try_claim_host(host->mmc)) return 0; clk_enable(host->fclk); - omap_mmc_restore_ctx(host); + if (mmc_card_can_sleep(host->mmc)) { + err = mmc_card_sleep(host->mmc); + if (err < 0) { + clk_disable(host->fclk); + mmc_release_host(host->mmc); + return err; + } + new_state = CARDSLEEP; + } else + new_state = REGSLEEP; + if (mmc_slot(host).set_sleep) + mmc_slot(host).set_sleep(host->dev, host->slot_id, 1, 0, + new_state == CARDSLEEP); + /* FIXME: turn off bus power and perhaps interrupts too */ + clk_disable(host->fclk); + host->dpm_state = new_state; + + mmc_release_host(host->mmc); + + dev_dbg(mmc_dev(host->mmc), "DISABLED -> %s\n", + host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP"); if ((host->mmc->caps & MMC_CAP_NONREMOVABLE) || mmc_slot(host).card_detect || (mmc_slot(host).get_cover_state && - mmc_slot(host).get_cover_state(host->dev, host->slot_id))) { - mmc_power_save_host(host->mmc); - new_state = OFF; - } else { - if (mmc_slot(host).set_sleep) - mmc_slot(host).set_sleep(host->dev, host->slot_id, - 1, 0, 0); - new_state = REGSLEEP; + mmc_slot(host).get_cover_state(host->dev, host->slot_id))) + return msecs_to_jiffies(OMAP_MMC_OFF_TIMEOUT); + + return 0; +} + +/* Handler for [REGSLEEP / CARDSLEEP -> OFF] transition */ +static int omap_mmc_sleep_to_off(struct mmc_omap_host *host) +{ + if (!mmc_try_claim_host(host->mmc)) + return 0; + + if (!((host->mmc->caps & MMC_CAP_NONREMOVABLE) || + mmc_slot(host).card_detect || + (mmc_slot(host).get_cover_state && + mmc_slot(host).get_cover_state(host->dev, host->slot_id)))) { + mmc_release_host(host->mmc); + return 0; } - OMAP_HSMMC_WRITE(host->base, ISE, 0); - OMAP_HSMMC_WRITE(host->base, IE, 0); - OMAP_HSMMC_WRITE(host->base, HCTL, - OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP); + mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0); + host->vdd = 0; + host->power_mode = MMC_POWER_OFF; - clk_disable(host->fclk); - clk_disable(host->iclk); - clk_disable(host->dbclk); + dev_dbg(mmc_dev(host->mmc), "%s -> OFF\n", + host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP"); - host->dpm_state = new_state; + host->dpm_state = OFF; mmc_release_host(host->mmc); @@ -1273,62 +1302,43 @@ static int omap_mmc_disabled_to_enabled(struct mmc_omap_host *host) return 0; } -/* Handler for [OFF -> ENABLED] transition */ -static int omap_mmc_off_to_enabled(struct mmc_omap_host *host) +/* Handler for [SLEEP -> ENABLED] transition */ +static int omap_mmc_sleep_to_enabled(struct mmc_omap_host *host) { - clk_enable(host->fclk); - clk_enable(host->iclk); - - if (clk_enable(host->dbclk)) - dev_dbg(mmc_dev(host->mmc), - "Enabling debounce clk failed\n"); + if (!mmc_try_claim_host(host->mmc)) + return 0; + clk_enable(host->fclk); omap_mmc_restore_ctx(host); - omap_hsmmc_init(host); - mmc_power_restore_host(host->mmc); + if (mmc_slot(host).set_sleep) + mmc_slot(host).set_sleep(host->dev, host->slot_id, 0, + host->vdd, host->dpm_state == CARDSLEEP); + if (mmc_card_can_sleep(host->mmc)) + mmc_card_awake(host->mmc); + + dev_dbg(mmc_dev(host->mmc), "%s -> ENABLED\n", + host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP"); host->dpm_state = ENABLED; - dev_dbg(mmc_dev(host->mmc), "OFF -> ENABLED\n"); + mmc_release_host(host->mmc); return 0; } -/* Handler for [REGSLEEP -> ENABLED] transition */ -static int omap_mmc_regsleep_to_enabled(struct mmc_omap_host *host) +/* Handler for [OFF -> ENABLED] transition */ +static int omap_mmc_off_to_enabled(struct mmc_omap_host *host) { - unsigned long timeout; - - dev_dbg(mmc_dev(host->mmc), "REGSLEEP -> ENABLED\n"); - clk_enable(host->fclk); - clk_enable(host->iclk); - - if (clk_enable(host->dbclk)) - dev_dbg(mmc_dev(host->mmc), - "Enabling debounce clk failed\n"); omap_mmc_restore_ctx(host); - - /* - * We turned off interrupts and bus power. Interrupts - * are turned on by 'mmc_omap_start_command()' so we - * just need to turn on the bus power here. - */ - OMAP_HSMMC_WRITE(host->base, HCTL, - OMAP_HSMMC_READ(host->base, HCTL) | SDBP); - - timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); - while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP && - time_before(jiffies, timeout)) - ; - - if (mmc_slot(host).set_sleep) - mmc_slot(host).set_sleep(host->dev, host->slot_id, - 0, host->vdd, 0); + omap_hsmmc_init(host); + mmc_power_restore_host(host->mmc); host->dpm_state = ENABLED; + dev_dbg(mmc_dev(host->mmc), "OFF -> ENABLED\n"); + return 0; } @@ -1342,8 +1352,9 @@ static int omap_mmc_enable(struct mmc_host *mmc) switch (host->dpm_state) { case DISABLED: return omap_mmc_disabled_to_enabled(host); + case CARDSLEEP: case REGSLEEP: - return omap_mmc_regsleep_to_enabled(host); + return omap_mmc_sleep_to_enabled(host); case OFF: return omap_mmc_off_to_enabled(host); default: @@ -1369,7 +1380,10 @@ static int omap_mmc_disable(struct mmc_host *mmc, int lazy) return 0; } case DISABLED: - return omap_mmc_disabled_to_off(host); + return omap_mmc_disabled_to_sleep(host); + case CARDSLEEP: + case REGSLEEP: + return omap_mmc_sleep_to_off(host); default: dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n"); return -EINVAL; @@ -1441,8 +1455,7 @@ static int mmc_regs_show(struct seq_file *s, void *data) host->dpm_state, mmc->nesting_cnt, host->context_loss, context_loss); - if (host->suspended || host->dpm_state == OFF || - host->dpm_state == REGSLEEP) { + if (host->suspended || host->dpm_state == OFF) { seq_printf(s, "host suspended, can't read registers\n"); return 0; } @@ -1617,7 +1630,8 @@ static int __init omap_mmc_probe(struct platform_device *pdev) mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; mmc->max_seg_size = mmc->max_req_size; - mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED; + mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED | + MMC_CAP_WAIT_WHILE_BUSY; if (pdata->slots[host->slot_id].wires >= 8) mmc->caps |= MMC_CAP_8_BIT_DATA; -- 2.7.4