diff options
| author | Lubomir Popov <lpopov@mm-sol.com> | 2013-08-14 18:59:18 +0300 |
|---|---|---|
| committer | Pantelis Antoniou <panto@antoniou-consulting.com> | 2013-09-17 20:03:44 +0300 |
| commit | 152ba36362377bd1a7c99e7e50cf53b5a8851e5c (patch) | |
| tree | d86eb6d1f3cc205fc75a8fb093bb6e03aa939c17 /drivers | |
| parent | 61a6cc27bce36ce2c27a8e4970796caa653c8529 (diff) | |
ARM: OMAP: Enable 8-bit eMMC access for OMAP4/5/DRA7xx
Enable 8-bit host capability for HSMMC2 and/or HSMMC3. CONFIG_HSMMC2_8BIT
(for OMAP4/5/DRA7xx) and/or CONFIG_HSMMC3_8BIT (for DRA7xx only) must be
defined in the board header if an 8-bit eMMC device is connected to the
corresponding port.
Fix the "No status update" error that appeared for eMMC devices by
inserting a 20 us delay between writing arguments and command. This
solution has been proposed by Michael Cashwell <mboards@prograde.net>.
A minor cosmetic fix in a comment as well.
Signed-off-by: Lubomir Popov <lpopov@mm-sol.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/omap_hsmmc.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c index 0e36bf9214..d3a8b5303d 100644 --- a/drivers/mmc/omap_hsmmc.c +++ b/drivers/mmc/omap_hsmmc.c @@ -400,6 +400,7 @@ static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, } writel(cmd->cmdarg, &mmc_base->arg); + udelay(20); /* To fix "No status update" error on eMMC */ writel((cmd->cmdidx << 24) | flags, &mmc_base->cmd); start = get_timer(0); @@ -504,7 +505,7 @@ static int mmc_write_data(struct hsmmc *mmc_base, const char *buf, unsigned int count; /* - * Start Polled Read + * Start Polled Write */ count = (size > MMCSD_SECTOR_SIZE) ? MMCSD_SECTOR_SIZE : size; count /= 4; @@ -610,6 +611,8 @@ int omap_mmc_init(int dev_index, uint host_caps_mask, uint f_max, int cd_gpio, { struct mmc *mmc = &hsmmc_dev[dev_index]; struct omap_hsmmc_data *priv_data = &hsmmc_dev_data[dev_index]; + uint host_caps_val = MMC_MODE_4BIT | MMC_MODE_HS_52MHz | MMC_MODE_HS | + MMC_MODE_HC; sprintf(mmc->name, "OMAP SD/MMC"); mmc->send_cmd = mmc_send_cmd; @@ -624,11 +627,20 @@ int omap_mmc_init(int dev_index, uint host_caps_mask, uint f_max, int cd_gpio, #ifdef OMAP_HSMMC2_BASE case 1: priv_data->base_addr = (struct hsmmc *)OMAP_HSMMC2_BASE; +#if (defined(CONFIG_OMAP44XX) || defined(CONFIG_OMAP54XX) || \ + defined(CONFIG_DRA7XX)) && defined(CONFIG_HSMMC2_8BIT) + /* Enable 8-bit interface for eMMC on OMAP4/5 or DRA7XX */ + host_caps_val |= MMC_MODE_8BIT; +#endif break; #endif #ifdef OMAP_HSMMC3_BASE case 2: priv_data->base_addr = (struct hsmmc *)OMAP_HSMMC3_BASE; +#if defined(CONFIG_DRA7XX) && defined(CONFIG_HSMMC3_8BIT) + /* Enable 8-bit interface for eMMC on DRA7XX */ + host_caps_val |= MMC_MODE_8BIT; +#endif break; #endif default: @@ -644,8 +656,7 @@ int omap_mmc_init(int dev_index, uint host_caps_mask, uint f_max, int cd_gpio, mmc->getwp = omap_mmc_getwp; mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195; - mmc->host_caps = (MMC_MODE_4BIT | MMC_MODE_HS_52MHz | MMC_MODE_HS | - MMC_MODE_HC) & ~host_caps_mask; + mmc->host_caps = host_caps_val & ~host_caps_mask; mmc->f_min = 400000; |