mmc: core: support HPI send command

HPI command is defined in eMMC4.41.
This feature is important for eMMC4.5 devices.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 4e11d56b3f70..007863eea4fb 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -547,3 +547,34 @@ int mmc_bus_test(struct mmc_card *card, u8 bus_width)
         err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
         return err;
 }
+
+int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
+{
+        struct mmc_command cmd = {0};
+        unsigned int opcode;
+        unsigned int flags;
+        int err;
+
+        opcode = card->ext_csd.hpi_cmd;
+        if (opcode == MMC_STOP_TRANSMISSION)
+                flags = MMC_RSP_R1 | MMC_CMD_AC;
+        else if (opcode == MMC_SEND_STATUS)
+                flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+        cmd.opcode = opcode;
+        cmd.arg = card->rca << 16 | 1;
+        cmd.flags = flags;
+        cmd.cmd_timeout_ms = card->ext_csd.out_of_int_time;
+
+        err = mmc_wait_for_cmd(card->host, &cmd, 0);
+        if (err) {
+                pr_warn("%s: error %d interrupting operation. "
+                        "HPI command response %#x\n", mmc_hostname(card->host),
+                        err, cmd.resp[0]);
+                return err;
+        }
+        if (status)
+                *status = cmd.resp[0];
+
+        return 0;
+}