For use by drivers that support eMMC standard tuning, add a new
mmc_send_tuning helper that sends 64-128 bytes and checks the result
for bit errors.
Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
---
drivers/mci/mci-core.c | 78 ++++++++++++++++++++++++++++++++++++++++++
include/mci.h | 1 +
2 files changed, 79 insertions(+)
diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index 2645f9240d93..204143011e30 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -1607,6 +1607,84 @@ int mci_execute_tuning(struct mci *mci)
return host->ops.execute_tuning(host, opcode);
}
+static const u8 tuning_blk_pattern_4bit[] = {
+ 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
+ 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
+ 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
+ 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
+ 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
+ 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
+ 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
+ 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
+};
+
+static const u8 tuning_blk_pattern_8bit[] = {
+ 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
+ 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
+ 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
+ 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
+ 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
+ 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
+ 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
+ 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
+ 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+ 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
+ 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
+ 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
+ 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
+ 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
+ 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
+ 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
+};
+
+int mmc_send_tuning(struct mci *mci, u32 opcode)
+{
+ struct mci_cmd cmd = {};
+ struct mci_data data = {};
+ const u8 *tuning_block_pattern;
+ int size, err = 0;
+ u8 *data_buf;
+
+ if (mci->host->ios.bus_width == MMC_BUS_WIDTH_8) {
+ tuning_block_pattern = tuning_blk_pattern_8bit;
+ size = sizeof(tuning_blk_pattern_8bit);
+ } else if (mci->host->ios.bus_width == MMC_BUS_WIDTH_4) {
+ tuning_block_pattern = tuning_blk_pattern_4bit;
+ size = sizeof(tuning_blk_pattern_4bit);
+ } else
+ return -EINVAL;
+
+ data_buf = calloc(size, 1);
+ if (!data_buf)
+ return -ENOMEM;
+
+ mci_setup_cmd(&cmd, opcode, 0, MMC_RSP_R1 | MMC_CMD_ADTC);
+
+
+ data.blocksize = size;
+ data.blocks = 1;
+ data.flags = MMC_DATA_READ;
+
+ /*
+ * According to the tuning specs, Tuning process
+ * is normally shorter 40 executions of CMD19,
+ * and timeout value should be shorter than 150 ms
+ */
+ data.timeout_ns = 150 * NSEC_PER_MSEC;
+
+ err = mci_send_cmd(mci, &cmd, &data);
+ if (err)
+ goto out;
+
+ if (memcmp(data_buf, tuning_block_pattern, size))
+ err = -EIO;
+
+out:
+ free(data_buf);
+ return err;
+}
+EXPORT_SYMBOL_GPL(mmc_send_tuning);
+
int mci_send_abort_tuning(struct mci *mci, u32 opcode)
{
struct mci_cmd cmd = {};
diff --git a/include/mci.h b/include/mci.h
index 29aaecb46305..207fb9779a14 100644
--- a/include/mci.h
+++ b/include/mci.h
@@ -773,6 +773,7 @@ static inline int mmc_card_hs(struct mci *mci)
*/
int mmc_hs200_tuning(struct mci *mci);
int mci_execute_tuning(struct mci *mci);
+int mmc_send_tuning(struct mci *mci, u32 opcode);
int mci_send_abort_tuning(struct mci *mci, u32 opcode);
int mmc_select_timing(struct mci *mci);
int mci_set_blockcount(struct mci *mci, unsigned int cmdarg);
--
2.39.5
