omap_hsmmc: support for deeper power saving states
Support for multi-level dynamic power saving states in omap_hsmmc (ENABLED->DISABLED->OFF). In the "deepest" state (OFF) we switch off the voltage regulators. Signed-off-by: Denis Karpov <ext-denis.2.karpov@nokia.com> Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com> Acked-by: Matt Fleming <matt@console-pimps.org> Cc: Ian Molton <ian@mnementh.co.uk> Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com> Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com> Cc: Denis Karpov <ext-denis.2.karpov@nokia.com> Cc: Pierre Ossman <pierre@ossman.eu> Cc: Philip Langdale <philipl@overt.org> Cc: "Madhusudhan" <madhu.cr@ti.com> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Denis Karpov
Linus Torvalds
parent
23d99bb923
commit
dd498effcf
@ -418,6 +418,9 @@ void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
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if (c->nonremovable)
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mmc->slots[0].nonremovable = 1;
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if (c->power_saving)
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mmc->slots[0].power_saving = 1;
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/* NOTE: MMC slots should have a Vcc regulator set up.
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* This may be from a TWL4030-family chip, another
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* controllable regulator, or a fixed supply.
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@ -13,6 +13,7 @@ struct twl4030_hsmmc_info {
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bool ext_clock; /* use external pin for input clock */
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bool cover_only; /* No card detect - just cover switch */
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bool nonremovable; /* Nonremovable e.g. eMMC */
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bool power_saving; /* Try to sleep or power off when possible */
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int gpio_cd; /* or -EINVAL */
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int gpio_wp; /* or -EINVAL */
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char *name; /* or NULL for default */
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@ -86,6 +86,9 @@ struct omap_mmc_platform_data {
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/* nonremovable e.g. eMMC */
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unsigned nonremovable:1;
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/* Try to sleep or power off when possible */
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unsigned power_saving:1;
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int switch_pin; /* gpio (card detect) */
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int gpio_wp; /* gpio (write protect) */
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@ -113,6 +113,10 @@
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#define OMAP_MMC_MASTER_CLOCK 96000000
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#define DRIVER_NAME "mmci-omap-hs"
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/* Timeouts for entering power saving states on inactivity, msec */
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#define OMAP_MMC_DISABLED_TIMEOUT 100
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#define OMAP_MMC_OFF_TIMEOUT 1000
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/*
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* One controller can have multiple slots, like on some omap boards using
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* omap.c controller driver. Luckily this is not currently done on any known
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@ -157,6 +161,7 @@ struct mmc_omap_host {
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int dbclk_enabled;
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int response_busy;
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int context_loss;
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int dpm_state;
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struct omap_mmc_platform_data *pdata;
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};
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@ -992,29 +997,6 @@ mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
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return 0;
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}
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static int omap_mmc_enable(struct mmc_host *mmc)
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{
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struct mmc_omap_host *host = mmc_priv(mmc);
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int err;
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err = clk_enable(host->fclk);
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if (err)
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return err;
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dev_dbg(mmc_dev(host->mmc), "mmc_fclk: enabled\n");
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omap_mmc_restore_ctx(host);
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return 0;
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}
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static int omap_mmc_disable(struct mmc_host *mmc, int lazy)
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{
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struct mmc_omap_host *host = mmc_priv(mmc);
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omap_mmc_save_ctx(host);
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clk_disable(host->fclk);
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dev_dbg(mmc_dev(host->mmc), "mmc_fclk: disabled\n");
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return 0;
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}
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/*
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* Request function. for read/write operation
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*/
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@ -1068,6 +1050,8 @@ static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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host->power_mode = ios->power_mode;
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}
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/* FIXME: set registers based only on changes to ios */
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con = OMAP_HSMMC_READ(host->base, CON);
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switch (mmc->ios.bus_width) {
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case MMC_BUS_WIDTH_8:
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@ -1140,7 +1124,10 @@ static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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else
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OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
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mmc_host_lazy_disable(host->mmc);
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if (host->power_mode == MMC_POWER_OFF)
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mmc_host_disable(host->mmc);
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else
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mmc_host_lazy_disable(host->mmc);
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}
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static int omap_hsmmc_get_cd(struct mmc_host *mmc)
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@ -1190,7 +1177,191 @@ static void omap_hsmmc_init(struct mmc_omap_host *host)
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set_sd_bus_power(host);
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}
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static struct mmc_host_ops mmc_omap_ops = {
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/*
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* Dynamic power saving handling, FSM:
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* ENABLED -> DISABLED -> OFF
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* ^___________| |
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* |______________________|
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*
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* ENABLED: mmc host is fully functional
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* DISABLED: fclk is off
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* OFF: fclk is off,voltage regulator is off
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*
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* Transition handlers return the timeout for the next state transition
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* or negative error.
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*/
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enum {ENABLED = 0, DISABLED, OFF};
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/* Handler for [ENABLED -> DISABLED] transition */
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static int omap_mmc_enabled_to_disabled(struct mmc_omap_host *host)
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{
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omap_mmc_save_ctx(host);
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clk_disable(host->fclk);
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host->dpm_state = DISABLED;
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dev_dbg(mmc_dev(host->mmc), "ENABLED -> DISABLED\n");
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if (host->power_mode == MMC_POWER_OFF)
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return 0;
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return msecs_to_jiffies(OMAP_MMC_OFF_TIMEOUT);
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}
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/* Handler for [DISABLED -> OFF] transition */
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static int omap_mmc_disabled_to_off(struct mmc_omap_host *host)
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{
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int new_state;
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dev_dbg(mmc_dev(host->mmc), "DISABLED -> OFF\n");
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if (!mmc_try_claim_host(host->mmc))
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return 0;
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clk_enable(host->fclk);
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omap_mmc_restore_ctx(host);
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if ((host->mmc->caps & MMC_CAP_NONREMOVABLE) ||
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mmc_slot(host).card_detect ||
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(mmc_slot(host).get_cover_state &&
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mmc_slot(host).get_cover_state(host->dev, host->slot_id))) {
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mmc_power_save_host(host->mmc);
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new_state = OFF;
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} else
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new_state = DISABLED;
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OMAP_HSMMC_WRITE(host->base, ISE, 0);
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OMAP_HSMMC_WRITE(host->base, IE, 0);
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OMAP_HSMMC_WRITE(host->base, HCTL,
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OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
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clk_disable(host->fclk);
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clk_disable(host->iclk);
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clk_disable(host->dbclk);
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host->dpm_state = new_state;
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mmc_release_host(host->mmc);
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return 0;
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}
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/* Handler for [DISABLED -> ENABLED] transition */
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static int omap_mmc_disabled_to_enabled(struct mmc_omap_host *host)
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{
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int err;
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err = clk_enable(host->fclk);
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if (err < 0)
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return err;
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omap_mmc_restore_ctx(host);
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host->dpm_state = ENABLED;
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dev_dbg(mmc_dev(host->mmc), "DISABLED -> ENABLED\n");
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return 0;
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}
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/* Handler for [OFF -> ENABLED] transition */
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static int omap_mmc_off_to_enabled(struct mmc_omap_host *host)
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{
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clk_enable(host->fclk);
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clk_enable(host->iclk);
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if (clk_enable(host->dbclk))
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dev_dbg(mmc_dev(host->mmc),
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"Enabling debounce clk failed\n");
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omap_mmc_restore_ctx(host);
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omap_hsmmc_init(host);
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mmc_power_restore_host(host->mmc);
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host->dpm_state = ENABLED;
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dev_dbg(mmc_dev(host->mmc), "OFF -> ENABLED\n");
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return 0;
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}
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/*
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* Bring MMC host to ENABLED from any other PM state.
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*/
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static int omap_mmc_enable(struct mmc_host *mmc)
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{
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struct mmc_omap_host *host = mmc_priv(mmc);
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switch (host->dpm_state) {
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case DISABLED:
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return omap_mmc_disabled_to_enabled(host);
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case OFF:
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return omap_mmc_off_to_enabled(host);
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default:
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dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n");
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return -EINVAL;
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}
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}
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/*
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* Bring MMC host in PM state (one level deeper).
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*/
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static int omap_mmc_disable(struct mmc_host *mmc, int lazy)
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{
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struct mmc_omap_host *host = mmc_priv(mmc);
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switch (host->dpm_state) {
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case ENABLED: {
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int delay;
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delay = omap_mmc_enabled_to_disabled(host);
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if (lazy || delay < 0)
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return delay;
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return 0;
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}
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case DISABLED:
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return omap_mmc_disabled_to_off(host);
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default:
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dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n");
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return -EINVAL;
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}
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}
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static int omap_mmc_enable_fclk(struct mmc_host *mmc)
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{
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struct mmc_omap_host *host = mmc_priv(mmc);
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int err;
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err = clk_enable(host->fclk);
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if (err)
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return err;
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dev_dbg(mmc_dev(host->mmc), "mmc_fclk: enabled\n");
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omap_mmc_restore_ctx(host);
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return 0;
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}
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static int omap_mmc_disable_fclk(struct mmc_host *mmc, int lazy)
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{
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struct mmc_omap_host *host = mmc_priv(mmc);
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omap_mmc_save_ctx(host);
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clk_disable(host->fclk);
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dev_dbg(mmc_dev(host->mmc), "mmc_fclk: disabled\n");
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return 0;
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}
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static const struct mmc_host_ops mmc_omap_ops = {
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.enable = omap_mmc_enable_fclk,
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.disable = omap_mmc_disable_fclk,
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.request = omap_mmc_request,
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.set_ios = omap_mmc_set_ios,
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.get_cd = omap_hsmmc_get_cd,
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.get_ro = omap_hsmmc_get_ro,
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/* NYET -- enable_sdio_irq */
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};
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static const struct mmc_host_ops mmc_omap_ps_ops = {
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.enable = omap_mmc_enable,
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.disable = omap_mmc_disable,
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.request = omap_mmc_request,
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@ -1214,15 +1385,22 @@ static int mmc_regs_show(struct seq_file *s, void *data)
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seq_printf(s, "mmc%d:\n"
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" enabled:\t%d\n"
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" dpm_state:\t%d\n"
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" nesting_cnt:\t%d\n"
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" ctx_loss:\t%d:%d\n"
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"\nregs:\n",
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mmc->index, mmc->enabled ? 1 : 0, mmc->nesting_cnt,
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mmc->index, mmc->enabled ? 1 : 0,
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host->dpm_state, mmc->nesting_cnt,
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host->context_loss, context_loss);
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if (host->suspended || host->dpm_state == OFF) {
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seq_printf(s, "host suspended, can't read registers\n");
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return 0;
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}
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if (clk_enable(host->fclk) != 0) {
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seq_printf(s, "can't read the regs\n");
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goto err;
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return 0;
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}
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seq_printf(s, "SYSCONFIG:\t0x%08x\n",
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@ -1241,7 +1419,7 @@ static int mmc_regs_show(struct seq_file *s, void *data)
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OMAP_HSMMC_READ(host->base, CAPA));
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clk_disable(host->fclk);
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err:
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return 0;
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}
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@ -1323,7 +1501,11 @@ static int __init omap_mmc_probe(struct platform_device *pdev)
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platform_set_drvdata(pdev, host);
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INIT_WORK(&host->mmc_carddetect_work, mmc_omap_detect);
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mmc->ops = &mmc_omap_ops;
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if (pdata->slots[host->slot_id].power_saving)
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mmc->ops = &mmc_omap_ps_ops;
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else
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mmc->ops = &mmc_omap_ops;
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mmc->f_min = 400000;
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mmc->f_max = 52000000;
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@ -1346,7 +1528,10 @@ static int __init omap_mmc_probe(struct platform_device *pdev)
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omap_mmc_save_ctx(host);
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mmc->caps |= MMC_CAP_DISABLE;
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mmc_set_disable_delay(mmc, 100);
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mmc_set_disable_delay(mmc, OMAP_MMC_DISABLED_TIMEOUT);
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/* we start off in DISABLED state */
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host->dpm_state = DISABLED;
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if (mmc_host_enable(host->mmc) != 0) {
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clk_put(host->iclk);
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clk_put(host->fclk);
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