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-rw-r--r--drivers/mmc/core/core.c15
-rw-r--r--drivers/mmc/core/host.h6
-rw-r--r--drivers/mmc/core/sd_ops.c49
-rw-r--r--drivers/mmc/core/sd_ops.h1
-rw-r--r--include/linux/mmc/host.h7
5 files changed, 74 insertions, 4 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index d42037f0f10d..19f1ee57fb34 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2147,8 +2147,12 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
mmc_go_idle(host);
- if (!(host->caps2 & MMC_CAP2_NO_SD))
- mmc_send_if_cond(host, host->ocr_avail);
+ if (!(host->caps2 & MMC_CAP2_NO_SD)) {
+ if (mmc_send_if_cond_pcie(host, host->ocr_avail))
+ goto out;
+ if (mmc_card_sd_express(host))
+ return 0;
+ }
/* Order's important: probe SDIO, then SD, then MMC */
if (!(host->caps2 & MMC_CAP2_NO_SDIO))
@@ -2163,6 +2167,7 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
if (!mmc_attach_mmc(host))
return 0;
+out:
mmc_power_off(host);
return -EIO;
}
@@ -2290,6 +2295,12 @@ void mmc_rescan(struct work_struct *work)
goto out;
}
+ /* If an SD express card is present, then leave it as is. */
+ if (mmc_card_sd_express(host)) {
+ mmc_release_host(host);
+ goto out;
+ }
+
for (i = 0; i < ARRAY_SIZE(freqs); i++) {
unsigned int freq = freqs[i];
if (freq > host->f_max) {
diff --git a/drivers/mmc/core/host.h b/drivers/mmc/core/host.h
index 5e3b9534ffb2..ba407617ed23 100644
--- a/drivers/mmc/core/host.h
+++ b/drivers/mmc/core/host.h
@@ -77,5 +77,11 @@ static inline bool mmc_card_hs400es(struct mmc_card *card)
return card->host->ios.enhanced_strobe;
}
+static inline bool mmc_card_sd_express(struct mmc_host *host)
+{
+ return host->ios.timing == MMC_TIMING_SD_EXP ||
+ host->ios.timing == MMC_TIMING_SD_EXP_1_2V;
+}
+
#endif
diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c
index 22bf528294b9..d61ff811218c 100644
--- a/drivers/mmc/core/sd_ops.c
+++ b/drivers/mmc/core/sd_ops.c
@@ -158,7 +158,8 @@ int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
return err;
}
-int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
+static int __mmc_send_if_cond(struct mmc_host *host, u32 ocr, u8 pcie_bits,
+ u32 *resp)
{
struct mmc_command cmd = {};
int err;
@@ -171,7 +172,7 @@ int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
* SD 1.0 cards.
*/
cmd.opcode = SD_SEND_IF_COND;
- cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
+ cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | pcie_bits << 8 | test_pattern;
cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
err = mmc_wait_for_cmd(host, &cmd, 0);
@@ -186,6 +187,50 @@ int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
if (result_pattern != test_pattern)
return -EIO;
+ if (resp)
+ *resp = cmd.resp[0];
+
+ return 0;
+}
+
+int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
+{
+ return __mmc_send_if_cond(host, ocr, 0, NULL);
+}
+
+int mmc_send_if_cond_pcie(struct mmc_host *host, u32 ocr)
+{
+ u32 resp = 0;
+ u8 pcie_bits = 0;
+ int ret;
+
+ if (host->caps2 & MMC_CAP2_SD_EXP) {
+ /* Probe card for SD express support via PCIe. */
+ pcie_bits = 0x10;
+ if (host->caps2 & MMC_CAP2_SD_EXP_1_2V)
+ /* Probe also for 1.2V support. */
+ pcie_bits = 0x30;
+ }
+
+ ret = __mmc_send_if_cond(host, ocr, pcie_bits, &resp);
+ if (ret)
+ return 0;
+
+ /* Continue with the SD express init, if the card supports it. */
+ resp &= 0x3000;
+ if (pcie_bits && resp) {
+ if (resp == 0x3000)
+ host->ios.timing = MMC_TIMING_SD_EXP_1_2V;
+ else
+ host->ios.timing = MMC_TIMING_SD_EXP;
+
+ /*
+ * According to the spec the clock shall also be gated, but
+ * let's leave this to the host driver for more flexibility.
+ */
+ return host->ops->init_sd_express(host, &host->ios);
+ }
+
return 0;
}
diff --git a/drivers/mmc/core/sd_ops.h b/drivers/mmc/core/sd_ops.h
index 2194cabfcfc5..3ba7b3cf4652 100644
--- a/drivers/mmc/core/sd_ops.h
+++ b/drivers/mmc/core/sd_ops.h
@@ -16,6 +16,7 @@ struct mmc_host;
int mmc_app_set_bus_width(struct mmc_card *card, int width);
int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr);
int mmc_send_if_cond(struct mmc_host *host, u32 ocr);
+int mmc_send_if_cond_pcie(struct mmc_host *host, u32 ocr);
int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca);
int mmc_app_send_scr(struct mmc_card *card);
int mmc_sd_switch(struct mmc_card *card, int mode, int group,
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c079b932330f..01bba36545c5 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -60,6 +60,8 @@ struct mmc_ios {
#define MMC_TIMING_MMC_DDR52 8
#define MMC_TIMING_MMC_HS200 9
#define MMC_TIMING_MMC_HS400 10
+#define MMC_TIMING_SD_EXP 11
+#define MMC_TIMING_SD_EXP_1_2V 12
unsigned char signal_voltage; /* signalling voltage (1.8V or 3.3V) */
@@ -173,6 +175,9 @@ struct mmc_host_ops {
*/
int (*multi_io_quirk)(struct mmc_card *card,
unsigned int direction, int blk_size);
+
+ /* Initialize an SD express card, mandatory for MMC_CAP2_SD_EXP. */
+ int (*init_sd_express)(struct mmc_host *host, struct mmc_ios *ios);
};
struct mmc_cqe_ops {
@@ -358,6 +363,8 @@ struct mmc_host {
#define MMC_CAP2_HS200_1_2V_SDR (1 << 6) /* can support */
#define MMC_CAP2_HS200 (MMC_CAP2_HS200_1_8V_SDR | \
MMC_CAP2_HS200_1_2V_SDR)
+#define MMC_CAP2_SD_EXP (1 << 7) /* SD express via PCIe */
+#define MMC_CAP2_SD_EXP_1_2V (1 << 8) /* SD express 1.2V */
#define MMC_CAP2_CD_ACTIVE_HIGH (1 << 10) /* Card-detect signal active high */
#define MMC_CAP2_RO_ACTIVE_HIGH (1 << 11) /* Write-protect signal active high */
#define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before scan */
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2025-01-21 23:14:46 +0000