[U-Boot] [PATCH 01/22] mmc: split mmc_startup()
Jean-Jacques Hiblot
jjhiblot at ti.com
Fri May 12 18:16:19 UTC 2017
No functionnal change here. The function is really big and can be split.
The part related to bus configuration are put in 2 separate functions: one
for MMC and one for SD.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot at ti.com>
---
drivers/mmc/mmc.c | 275 +++++++++++++++++++++++++++++-------------------------
1 file changed, 149 insertions(+), 126 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 72fc177..7a17bac 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1103,6 +1103,153 @@ static void mmc_set_bus_width(struct mmc *mmc, uint width)
mmc_set_ios(mmc);
}
+static int sd_select_bus_freq_width(struct mmc *mmc)
+{
+ int err;
+ struct mmc_cmd cmd;
+
+ err = sd_change_freq(mmc);
+ if (err)
+ return err;
+
+ /* Restrict card's capabilities by what the host can do */
+ mmc->card_caps &= mmc->cfg->host_caps;
+
+ if (mmc->card_caps & MMC_MODE_4BIT) {
+ cmd.cmdidx = MMC_CMD_APP_CMD;
+ cmd.resp_type = MMC_RSP_R1;
+ cmd.cmdarg = mmc->rca << 16;
+
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+ if (err)
+ return err;
+
+ cmd.cmdidx = SD_CMD_APP_SET_BUS_WIDTH;
+ cmd.resp_type = MMC_RSP_R1;
+ cmd.cmdarg = 2;
+ err = mmc_send_cmd(mmc, &cmd, NULL);
+ if (err)
+ return err;
+
+ mmc_set_bus_width(mmc, 4);
+ }
+
+ err = sd_read_ssr(mmc);
+ if (err)
+ return err;
+
+ if (mmc->card_caps & MMC_MODE_HS)
+ mmc->tran_speed = 50000000;
+ else
+ mmc->tran_speed = 25000000;
+
+ return 0;
+}
+
+static int mmc_select_bus_freq_width(struct mmc *mmc, const u8 *ext_csd)
+{
+ ALLOC_CACHE_ALIGN_BUFFER(u8, test_csd, MMC_MAX_BLOCK_LEN);
+ /* An array of possible bus widths in order of preference */
+ static const unsigned ext_csd_bits[] = {
+ EXT_CSD_DDR_BUS_WIDTH_8,
+ EXT_CSD_DDR_BUS_WIDTH_4,
+ EXT_CSD_BUS_WIDTH_8,
+ EXT_CSD_BUS_WIDTH_4,
+ EXT_CSD_BUS_WIDTH_1,
+ };
+ /* An array to map CSD bus widths to host cap bits */
+ static const unsigned ext_to_hostcaps[] = {
+ [EXT_CSD_DDR_BUS_WIDTH_4] =
+ MMC_MODE_DDR_52MHz | MMC_MODE_4BIT,
+ [EXT_CSD_DDR_BUS_WIDTH_8] =
+ MMC_MODE_DDR_52MHz | MMC_MODE_8BIT,
+ [EXT_CSD_BUS_WIDTH_4] = MMC_MODE_4BIT,
+ [EXT_CSD_BUS_WIDTH_8] = MMC_MODE_8BIT,
+ };
+ /* An array to map chosen bus width to an integer */
+ static const unsigned widths[] = {
+ 8, 4, 8, 4, 1,
+ };
+ int err;
+ int idx;
+
+ err = mmc_change_freq(mmc);
+ if (err)
+ return err;
+
+ /* Restrict card's capabilities by what the host can do */
+ mmc->card_caps &= mmc->cfg->host_caps;
+
+ /* Only version 4 of MMC supports wider bus widths */
+ if (mmc->version < MMC_VERSION_4)
+ return 0;
+
+ for (idx = 0; idx < ARRAY_SIZE(ext_csd_bits); idx++) {
+ unsigned int extw = ext_csd_bits[idx];
+ unsigned int caps = ext_to_hostcaps[extw];
+
+ /*
+ * If the bus width is still not changed,
+ * don't try to set the default again.
+ * Otherwise, recover from switch attempts
+ * by switching to 1-bit bus width.
+ */
+ if (extw == EXT_CSD_BUS_WIDTH_1 &&
+ mmc->bus_width == 1) {
+ err = 0;
+ break;
+ }
+
+ /*
+ * Check to make sure the card and controller support
+ * these capabilities
+ */
+ if ((mmc->card_caps & caps) != caps)
+ continue;
+
+ err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_BUS_WIDTH, extw);
+
+ if (err)
+ continue;
+
+ mmc->ddr_mode = (caps & MMC_MODE_DDR_52MHz) ? 1 : 0;
+ mmc_set_bus_width(mmc, widths[idx]);
+
+ err = mmc_send_ext_csd(mmc, test_csd);
+
+ if (err)
+ continue;
+
+ /* Only compare read only fields */
+ if (ext_csd[EXT_CSD_PARTITIONING_SUPPORT]
+ == test_csd[EXT_CSD_PARTITIONING_SUPPORT] &&
+ ext_csd[EXT_CSD_HC_WP_GRP_SIZE]
+ == test_csd[EXT_CSD_HC_WP_GRP_SIZE] &&
+ ext_csd[EXT_CSD_REV]
+ == test_csd[EXT_CSD_REV] &&
+ ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]
+ == test_csd[EXT_CSD_HC_ERASE_GRP_SIZE] &&
+ memcmp(&ext_csd[EXT_CSD_SEC_CNT],
+ &test_csd[EXT_CSD_SEC_CNT], 4) == 0)
+ break;
+ else
+ err = -EBADMSG;
+ }
+
+ if (err)
+ return err;
+
+ if (mmc->card_caps & MMC_MODE_HS) {
+ if (mmc->card_caps & MMC_MODE_HS_52MHz)
+ mmc->tran_speed = 52000000;
+ else
+ mmc->tran_speed = 26000000;
+ }
+
+ return err;
+}
+
static int mmc_startup(struct mmc *mmc)
{
int err, i;
@@ -1110,7 +1257,6 @@ static int mmc_startup(struct mmc *mmc)
u64 cmult, csize, capacity;
struct mmc_cmd cmd;
ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN);
- ALLOC_CACHE_ALIGN_BUFFER(u8, test_csd, MMC_MAX_BLOCK_LEN);
bool has_parts = false;
bool part_completed;
struct blk_desc *bdesc;
@@ -1415,136 +1561,13 @@ static int mmc_startup(struct mmc *mmc)
return err;
if (IS_SD(mmc))
- err = sd_change_freq(mmc);
+ err = sd_select_bus_freq_width(mmc);
else
- err = mmc_change_freq(mmc);
+ err = mmc_select_bus_freq_width(mmc, ext_csd);
if (err)
return err;
- /* Restrict card's capabilities by what the host can do */
- mmc->card_caps &= mmc->cfg->host_caps;
-
- if (IS_SD(mmc)) {
- if (mmc->card_caps & MMC_MODE_4BIT) {
- cmd.cmdidx = MMC_CMD_APP_CMD;
- cmd.resp_type = MMC_RSP_R1;
- cmd.cmdarg = mmc->rca << 16;
-
- err = mmc_send_cmd(mmc, &cmd, NULL);
- if (err)
- return err;
-
- cmd.cmdidx = SD_CMD_APP_SET_BUS_WIDTH;
- cmd.resp_type = MMC_RSP_R1;
- cmd.cmdarg = 2;
- err = mmc_send_cmd(mmc, &cmd, NULL);
- if (err)
- return err;
-
- mmc_set_bus_width(mmc, 4);
- }
-
- err = sd_read_ssr(mmc);
- if (err)
- return err;
-
- if (mmc->card_caps & MMC_MODE_HS)
- mmc->tran_speed = 50000000;
- else
- mmc->tran_speed = 25000000;
- } else if (mmc->version >= MMC_VERSION_4) {
- /* Only version 4 of MMC supports wider bus widths */
- int idx;
-
- /* An array of possible bus widths in order of preference */
- static unsigned ext_csd_bits[] = {
- EXT_CSD_DDR_BUS_WIDTH_8,
- EXT_CSD_DDR_BUS_WIDTH_4,
- EXT_CSD_BUS_WIDTH_8,
- EXT_CSD_BUS_WIDTH_4,
- EXT_CSD_BUS_WIDTH_1,
- };
-
- /* An array to map CSD bus widths to host cap bits */
- static unsigned ext_to_hostcaps[] = {
- [EXT_CSD_DDR_BUS_WIDTH_4] =
- MMC_MODE_DDR_52MHz | MMC_MODE_4BIT,
- [EXT_CSD_DDR_BUS_WIDTH_8] =
- MMC_MODE_DDR_52MHz | MMC_MODE_8BIT,
- [EXT_CSD_BUS_WIDTH_4] = MMC_MODE_4BIT,
- [EXT_CSD_BUS_WIDTH_8] = MMC_MODE_8BIT,
- };
-
- /* An array to map chosen bus width to an integer */
- static unsigned widths[] = {
- 8, 4, 8, 4, 1,
- };
-
- for (idx=0; idx < ARRAY_SIZE(ext_csd_bits); idx++) {
- unsigned int extw = ext_csd_bits[idx];
- unsigned int caps = ext_to_hostcaps[extw];
-
- /*
- * If the bus width is still not changed,
- * don't try to set the default again.
- * Otherwise, recover from switch attempts
- * by switching to 1-bit bus width.
- */
- if (extw == EXT_CSD_BUS_WIDTH_1 &&
- mmc->bus_width == 1) {
- err = 0;
- break;
- }
-
- /*
- * Check to make sure the card and controller support
- * these capabilities
- */
- if ((mmc->card_caps & caps) != caps)
- continue;
-
- err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_BUS_WIDTH, extw);
-
- if (err)
- continue;
-
- mmc->ddr_mode = (caps & MMC_MODE_DDR_52MHz) ? 1 : 0;
- mmc_set_bus_width(mmc, widths[idx]);
-
- err = mmc_send_ext_csd(mmc, test_csd);
-
- if (err)
- continue;
-
- /* Only compare read only fields */
- if (ext_csd[EXT_CSD_PARTITIONING_SUPPORT]
- == test_csd[EXT_CSD_PARTITIONING_SUPPORT] &&
- ext_csd[EXT_CSD_HC_WP_GRP_SIZE]
- == test_csd[EXT_CSD_HC_WP_GRP_SIZE] &&
- ext_csd[EXT_CSD_REV]
- == test_csd[EXT_CSD_REV] &&
- ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]
- == test_csd[EXT_CSD_HC_ERASE_GRP_SIZE] &&
- memcmp(&ext_csd[EXT_CSD_SEC_CNT],
- &test_csd[EXT_CSD_SEC_CNT], 4) == 0)
- break;
- else
- err = -EBADMSG;
- }
-
- if (err)
- return err;
-
- if (mmc->card_caps & MMC_MODE_HS) {
- if (mmc->card_caps & MMC_MODE_HS_52MHz)
- mmc->tran_speed = 52000000;
- else
- mmc->tran_speed = 26000000;
- }
- }
-
mmc_set_clock(mmc, mmc->tran_speed);
/* Fix the block length for DDR mode */
--
1.9.1
More information about the U-Boot
mailing list