diff options
Diffstat (limited to 'drivers/mmc/core/mmc.c')
-rw-r--r-- | drivers/mmc/core/mmc.c | 149 |
1 files changed, 119 insertions, 30 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 2fb9d5f..bfefce3 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -160,7 +160,6 @@ static int mmc_read_ext_csd(struct mmc_card *card) { int err; u8 *ext_csd; - unsigned int ext_csd_struct; BUG_ON(!card); @@ -180,11 +179,11 @@ static int mmc_read_ext_csd(struct mmc_card *card) err = mmc_send_ext_csd(card, ext_csd); if (err) { - /* - * We all hosts that cannot perform the command - * to fail more gracefully - */ - if (err != -EINVAL) + /* If the host or the card can't do the switch, + * fail more gracefully. */ + if ((err != -EINVAL) + && (err != -ENOSYS) + && (err != -EFAULT)) goto out; /* @@ -207,16 +206,16 @@ static int mmc_read_ext_csd(struct mmc_card *card) goto out; } - ext_csd_struct = ext_csd[EXT_CSD_REV]; - if (ext_csd_struct > 3) { + card->ext_csd.rev = ext_csd[EXT_CSD_REV]; + if (card->ext_csd.rev > 3) { printk(KERN_ERR "%s: unrecognised EXT_CSD structure " "version %d\n", mmc_hostname(card->host), - ext_csd_struct); + card->ext_csd.rev); err = -EINVAL; goto out; } - if (ext_csd_struct >= 2) { + if (card->ext_csd.rev >= 2) { card->ext_csd.sectors = ext_csd[EXT_CSD_SEC_CNT + 0] << 0 | ext_csd[EXT_CSD_SEC_CNT + 1] << 8 | @@ -241,6 +240,15 @@ static int mmc_read_ext_csd(struct mmc_card *card) goto out; } + if (card->ext_csd.rev >= 3) { + u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT]; + + /* Sleep / awake timeout in 100ns units */ + if (sa_shift > 0 && sa_shift <= 0x17) + card->ext_csd.sa_timeout = + 1 << ext_csd[EXT_CSD_S_A_TIMEOUT]; + } + out: kfree(ext_csd); @@ -408,12 +416,17 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, (host->caps & MMC_CAP_MMC_HIGHSPEED)) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, 1); - if (err) + if (err && err != -EBADMSG) goto free_card; - mmc_card_set_highspeed(card); - - mmc_set_timing(card->host, MMC_TIMING_MMC_HS); + if (err) { + printk(KERN_WARNING "%s: switch to highspeed failed\n", + mmc_hostname(card->host)); + err = 0; + } else { + mmc_card_set_highspeed(card); + mmc_set_timing(card->host, MMC_TIMING_MMC_HS); + } } /* @@ -448,10 +461,17 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH, ext_csd_bit); - if (err) + if (err && err != -EBADMSG) goto free_card; - mmc_set_bus_width(card->host, bus_width); + if (err) { + printk(KERN_WARNING "%s: switch to bus width %d " + "failed\n", mmc_hostname(card->host), + 1 << bus_width); + err = 0; + } else { + mmc_set_bus_width(card->host, bus_width); + } } if (!oldcard) @@ -507,12 +527,10 @@ static void mmc_detect(struct mmc_host *host) } } -#ifdef CONFIG_MMC_UNSAFE_RESUME - /* * Suspend callback from host. */ -static void mmc_suspend(struct mmc_host *host) +static int mmc_suspend(struct mmc_host *host) { BUG_ON(!host); BUG_ON(!host->card); @@ -522,6 +540,8 @@ static void mmc_suspend(struct mmc_host *host) mmc_deselect_cards(host); host->card->state &= ~MMC_STATE_HIGHSPEED; mmc_release_host(host); + + return 0; } /* @@ -530,7 +550,7 @@ static void mmc_suspend(struct mmc_host *host) * This function tries to determine if the same card is still present * and, if so, restore all state to it. */ -static void mmc_resume(struct mmc_host *host) +static int mmc_resume(struct mmc_host *host) { int err; @@ -541,30 +561,99 @@ static void mmc_resume(struct mmc_host *host) err = mmc_init_card(host, host->ocr, host->card); mmc_release_host(host); - if (err) { - mmc_remove(host); + return err; +} - mmc_claim_host(host); - mmc_detach_bus(host); - mmc_release_host(host); +static void mmc_power_restore(struct mmc_host *host) +{ + host->card->state &= ~MMC_STATE_HIGHSPEED; + mmc_claim_host(host); + mmc_init_card(host, host->ocr, host->card); + mmc_release_host(host); +} + +static int mmc_sleep(struct mmc_host *host) +{ + struct mmc_card *card = host->card; + int err = -ENOSYS; + + if (card && card->ext_csd.rev >= 3) { + err = mmc_card_sleepawake(host, 1); + if (err < 0) + pr_debug("%s: Error %d while putting card into sleep", + mmc_hostname(host), err); } + return err; } -#else +static int mmc_awake(struct mmc_host *host) +{ + struct mmc_card *card = host->card; + int err = -ENOSYS; + + if (card && card->ext_csd.rev >= 3) { + err = mmc_card_sleepawake(host, 0); + if (err < 0) + pr_debug("%s: Error %d while awaking sleeping card", + mmc_hostname(host), err); + } + + return err; +} -#define mmc_suspend NULL -#define mmc_resume NULL +#ifdef CONFIG_MMC_UNSAFE_RESUME -#endif +static const struct mmc_bus_ops mmc_ops = { + .awake = mmc_awake, + .sleep = mmc_sleep, + .remove = mmc_remove, + .detect = mmc_detect, + .suspend = mmc_suspend, + .resume = mmc_resume, + .power_restore = mmc_power_restore, +}; + +static void mmc_attach_bus_ops(struct mmc_host *host) +{ + mmc_attach_bus(host, &mmc_ops); +} + +#else static const struct mmc_bus_ops mmc_ops = { + .awake = mmc_awake, + .sleep = mmc_sleep, + .remove = mmc_remove, + .detect = mmc_detect, + .suspend = NULL, + .resume = NULL, + .power_restore = mmc_power_restore, +}; + +static const struct mmc_bus_ops mmc_ops_unsafe = { + .awake = mmc_awake, + .sleep = mmc_sleep, .remove = mmc_remove, .detect = mmc_detect, .suspend = mmc_suspend, .resume = mmc_resume, + .power_restore = mmc_power_restore, }; +static void mmc_attach_bus_ops(struct mmc_host *host) +{ + const struct mmc_bus_ops *bus_ops; + + if (host->caps & MMC_CAP_NONREMOVABLE) + bus_ops = &mmc_ops_unsafe; + else + bus_ops = &mmc_ops; + mmc_attach_bus(host, bus_ops); +} + +#endif + /* * Starting point for MMC card init. */ @@ -575,7 +664,7 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr) BUG_ON(!host); WARN_ON(!host->claimed); - mmc_attach_bus(host, &mmc_ops); + mmc_attach_bus_ops(host); /* * We need to get OCR a different way for SPI. |