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path: root/drivers/mmc/core/mmc_ops.c
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Diffstat (limited to 'drivers/mmc/core/mmc_ops.c')
-rw-r--r--drivers/mmc/core/mmc_ops.c258
1 files changed, 165 insertions, 93 deletions
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 69370f494e0..f51b5ba3bbe 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -21,6 +21,42 @@
#include "core.h"
#include "mmc_ops.h"
+#define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
+
+static inline int __mmc_send_status(struct mmc_card *card, u32 *status,
+ bool ignore_crc)
+{
+ int err;
+ struct mmc_command cmd = {0};
+
+ BUG_ON(!card);
+ BUG_ON(!card->host);
+
+ cmd.opcode = MMC_SEND_STATUS;
+ if (!mmc_host_is_spi(card->host))
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
+ if (ignore_crc)
+ cmd.flags &= ~MMC_RSP_CRC;
+
+ err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
+ if (err)
+ return err;
+
+ /* NOTE: callers are required to understand the difference
+ * between "native" and SPI format status words!
+ */
+ if (status)
+ *status = cmd.resp[0];
+
+ return 0;
+}
+
+int mmc_send_status(struct mmc_card *card, u32 *status)
+{
+ return __mmc_send_status(card, status, false);
+}
+
static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
{
int err;
@@ -57,40 +93,6 @@ int mmc_deselect_cards(struct mmc_host *host)
return _mmc_select_card(host, NULL);
}
-int mmc_card_sleepawake(struct mmc_host *host, int sleep)
-{
- struct mmc_command cmd = {0};
- struct mmc_card *card = host->card;
- int err;
-
- if (sleep)
- mmc_deselect_cards(host);
-
- cmd.opcode = MMC_SLEEP_AWAKE;
- cmd.arg = card->rca << 16;
- if (sleep)
- cmd.arg |= 1 << 15;
-
- cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
- err = mmc_wait_for_cmd(host, &cmd, 0);
- if (err)
- return err;
-
- /*
- * If the host does not wait while the card signals busy, then we will
- * will have to wait the sleep/awake timeout. Note, we cannot use the
- * SEND_STATUS command to poll the status because that command (and most
- * others) is invalid while the card sleeps.
- */
- if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
- mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
-
- if (!sleep)
- err = mmc_select_card(card);
-
- return err;
-}
-
int mmc_go_idle(struct mmc_host *host)
{
int err;
@@ -230,6 +232,10 @@ mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
return 0;
}
+/*
+ * NOTE: void *buf, caller for the buf is required to use DMA-capable
+ * buffer or on-stack buffer (with some overhead in callee).
+ */
static int
mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
u32 opcode, void *buf, unsigned len)
@@ -239,13 +245,19 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
struct mmc_data data = {0};
struct scatterlist sg;
void *data_buf;
+ int is_on_stack;
- /* dma onto stack is unsafe/nonportable, but callers to this
- * routine normally provide temporary on-stack buffers ...
- */
- data_buf = kmalloc(len, GFP_KERNEL);
- if (data_buf == NULL)
- return -ENOMEM;
+ is_on_stack = object_is_on_stack(buf);
+ if (is_on_stack) {
+ /*
+ * dma onto stack is unsafe/nonportable, but callers to this
+ * routine normally provide temporary on-stack buffers ...
+ */
+ data_buf = kmalloc(len, GFP_KERNEL);
+ if (!data_buf)
+ return -ENOMEM;
+ } else
+ data_buf = buf;
mrq.cmd = &cmd;
mrq.data = &data;
@@ -280,8 +292,10 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
mmc_wait_for_req(host, &mrq);
- memcpy(buf, data_buf, len);
- kfree(data_buf);
+ if (is_on_stack) {
+ memcpy(buf, data_buf, len);
+ kfree(data_buf);
+ }
if (cmd.error)
return cmd.error;
@@ -294,24 +308,32 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
int mmc_send_csd(struct mmc_card *card, u32 *csd)
{
int ret, i;
+ u32 *csd_tmp;
if (!mmc_host_is_spi(card->host))
return mmc_send_cxd_native(card->host, card->rca << 16,
csd, MMC_SEND_CSD);
- ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
+ csd_tmp = kmalloc(16, GFP_KERNEL);
+ if (!csd_tmp)
+ return -ENOMEM;
+
+ ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
if (ret)
- return ret;
+ goto err;
for (i = 0;i < 4;i++)
- csd[i] = be32_to_cpu(csd[i]);
+ csd[i] = be32_to_cpu(csd_tmp[i]);
- return 0;
+err:
+ kfree(csd_tmp);
+ return ret;
}
int mmc_send_cid(struct mmc_host *host, u32 *cid)
{
int ret, i;
+ u32 *cid_tmp;
if (!mmc_host_is_spi(host)) {
if (!host->card)
@@ -320,14 +342,20 @@ int mmc_send_cid(struct mmc_host *host, u32 *cid)
cid, MMC_SEND_CID);
}
- ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
+ cid_tmp = kmalloc(16, GFP_KERNEL);
+ if (!cid_tmp)
+ return -ENOMEM;
+
+ ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
if (ret)
- return ret;
+ goto err;
for (i = 0;i < 4;i++)
- cid[i] = be32_to_cpu(cid[i]);
+ cid[i] = be32_to_cpu(cid_tmp[i]);
- return 0;
+err:
+ kfree(cid_tmp);
+ return ret;
}
int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
@@ -335,6 +363,7 @@ int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
ext_csd, 512);
}
+EXPORT_SYMBOL_GPL(mmc_send_ext_csd);
int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
{
@@ -367,89 +396,132 @@ int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
}
/**
- * mmc_switch - modify EXT_CSD register
+ * __mmc_switch - modify EXT_CSD register
* @card: the MMC card associated with the data transfer
* @set: cmd set values
* @index: EXT_CSD register index
* @value: value to program into EXT_CSD register
* @timeout_ms: timeout (ms) for operation performed by register write,
* timeout of zero implies maximum possible timeout
+ * @use_busy_signal: use the busy signal as response type
+ * @send_status: send status cmd to poll for busy
+ * @ignore_crc: ignore CRC errors when sending status cmd to poll for busy
*
* Modifies the EXT_CSD register for selected card.
*/
-int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
- unsigned int timeout_ms)
+int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
+ unsigned int timeout_ms, bool use_busy_signal, bool send_status,
+ bool ignore_crc)
{
+ struct mmc_host *host = card->host;
int err;
struct mmc_command cmd = {0};
- u32 status;
+ unsigned long timeout;
+ u32 status = 0;
+ bool use_r1b_resp = use_busy_signal;
- BUG_ON(!card);
- BUG_ON(!card->host);
+ /*
+ * If the cmd timeout and the max_busy_timeout of the host are both
+ * specified, let's validate them. A failure means we need to prevent
+ * the host from doing hw busy detection, which is done by converting
+ * to a R1 response instead of a R1B.
+ */
+ if (timeout_ms && host->max_busy_timeout &&
+ (timeout_ms > host->max_busy_timeout))
+ use_r1b_resp = false;
cmd.opcode = MMC_SWITCH;
cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
(index << 16) |
(value << 8) |
set;
- cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
- cmd.cmd_timeout_ms = timeout_ms;
+ cmd.flags = MMC_CMD_AC;
+ if (use_r1b_resp) {
+ cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
+ /*
+ * A busy_timeout of zero means the host can decide to use
+ * whatever value it finds suitable.
+ */
+ cmd.busy_timeout = timeout_ms;
+ } else {
+ cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
+ }
- err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
+ if (index == EXT_CSD_SANITIZE_START)
+ cmd.sanitize_busy = true;
+
+ err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
if (err)
return err;
- /* Must check status to be sure of no errors */
+ /* No need to check card status in case of unblocking command */
+ if (!use_busy_signal)
+ return 0;
+
+ /*
+ * CRC errors shall only be ignored in cases were CMD13 is used to poll
+ * to detect busy completion.
+ */
+ if ((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
+ ignore_crc = false;
+
+ /* We have an unspecified cmd timeout, use the fallback value. */
+ if (!timeout_ms)
+ timeout_ms = MMC_OPS_TIMEOUT_MS;
+
+ /* Must check status to be sure of no errors. */
+ timeout = jiffies + msecs_to_jiffies(timeout_ms);
do {
- err = mmc_send_status(card, &status);
- if (err)
- return err;
- if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
+ if (send_status) {
+ err = __mmc_send_status(card, &status, ignore_crc);
+ if (err)
+ return err;
+ }
+ if ((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
break;
- if (mmc_host_is_spi(card->host))
+ if (mmc_host_is_spi(host))
break;
+
+ /*
+ * We are not allowed to issue a status command and the host
+ * does'nt support MMC_CAP_WAIT_WHILE_BUSY, then we can only
+ * rely on waiting for the stated timeout to be sufficient.
+ */
+ if (!send_status) {
+ mmc_delay(timeout_ms);
+ return 0;
+ }
+
+ /* Timeout if the device never leaves the program state. */
+ if (time_after(jiffies, timeout)) {
+ pr_err("%s: Card stuck in programming state! %s\n",
+ mmc_hostname(host), __func__);
+ return -ETIMEDOUT;
+ }
} while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
- if (mmc_host_is_spi(card->host)) {
+ if (mmc_host_is_spi(host)) {
if (status & R1_SPI_ILLEGAL_COMMAND)
return -EBADMSG;
} else {
if (status & 0xFDFFA000)
- pr_warning("%s: unexpected status %#x after "
- "switch", mmc_hostname(card->host), status);
+ pr_warn("%s: unexpected status %#x after switch\n",
+ mmc_hostname(host), status);
if (status & R1_SWITCH_ERROR)
return -EBADMSG;
}
return 0;
}
-EXPORT_SYMBOL_GPL(mmc_switch);
+EXPORT_SYMBOL_GPL(__mmc_switch);
-int mmc_send_status(struct mmc_card *card, u32 *status)
+int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
+ unsigned int timeout_ms)
{
- int err;
- struct mmc_command cmd = {0};
-
- BUG_ON(!card);
- BUG_ON(!card->host);
-
- cmd.opcode = MMC_SEND_STATUS;
- if (!mmc_host_is_spi(card->host))
- cmd.arg = card->rca << 16;
- cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
-
- err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
- if (err)
- return err;
-
- /* NOTE: callers are required to understand the difference
- * between "native" and SPI format status words!
- */
- if (status)
- *status = cmd.resp[0];
-
- return 0;
+ return __mmc_switch(card, set, index, value, timeout_ms, true, true,
+ false);
}
+EXPORT_SYMBOL_GPL(mmc_switch);
static int
mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
@@ -507,6 +579,7 @@ mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
data.sg = &sg;
data.sg_len = 1;
+ mmc_set_data_timeout(&data, card);
sg_init_one(&sg, data_buf, len);
mmc_wait_for_req(host, &mrq);
err = 0;
@@ -569,7 +642,6 @@ int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
cmd.opcode = opcode;
cmd.arg = card->rca << 16 | 1;
- cmd.cmd_timeout_ms = card->ext_csd.out_of_int_time;
err = mmc_wait_for_cmd(card->host, &cmd, 0);
if (err) {
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 15:20:32 +0000