#include <linux/mmc/mmc.h>
#include "core.h"
+#include "card.h"
#include "host.h"
#include "mmc_ops.h"
0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
};
-int mmc_send_status(struct mmc_card *card, u32 *status)
+int __mmc_send_status(struct mmc_card *card, u32 *status, unsigned int retries)
{
int err;
struct mmc_command cmd = {};
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);
+ err = mmc_wait_for_cmd(card->host, &cmd, retries);
if (err)
return err;
return 0;
}
+EXPORT_SYMBOL_GPL(__mmc_send_status);
+
+int mmc_send_status(struct mmc_card *card, u32 *status)
+{
+ return __mmc_send_status(card, status, MMC_CMD_RETRIES);
+}
static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
{
return err;
}
-int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
-{
- int err;
- struct mmc_command cmd = {};
-
- cmd.opcode = MMC_ALL_SEND_CID;
- cmd.arg = 0;
- cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
-
- err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
- if (err)
- return err;
-
- memcpy(cid, cmd.resp, sizeof(u32) * 4);
-
- return 0;
-}
-
int mmc_set_relative_addr(struct mmc_card *card)
{
struct mmc_command cmd = {};
return 0;
}
-int mmc_send_csd(struct mmc_card *card, u32 *csd)
+static int mmc_spi_send_csd(struct mmc_card *card, u32 *csd)
{
int ret, i;
__be32 *csd_tmp;
- if (!mmc_host_is_spi(card->host))
- return mmc_send_cxd_native(card->host, card->rca << 16,
- csd, MMC_SEND_CSD);
-
csd_tmp = kzalloc(16, GFP_KERNEL);
if (!csd_tmp)
return -ENOMEM;
return ret;
}
-int mmc_send_cid(struct mmc_host *host, u32 *cid)
+int mmc_send_csd(struct mmc_card *card, u32 *csd)
+{
+ if (mmc_host_is_spi(card->host))
+ return mmc_spi_send_csd(card, csd);
+
+ return mmc_send_cxd_native(card->host, card->rca << 16, csd,
+ MMC_SEND_CSD);
+}
+
+static int mmc_spi_send_cid(struct mmc_host *host, u32 *cid)
{
int ret, i;
__be32 *cid_tmp;
- if (!mmc_host_is_spi(host)) {
- if (!host->card)
- return -EINVAL;
- return mmc_send_cxd_native(host, host->card->rca << 16,
- cid, MMC_SEND_CID);
- }
-
cid_tmp = kzalloc(16, GFP_KERNEL);
if (!cid_tmp)
return -ENOMEM;
return ret;
}
+int mmc_send_cid(struct mmc_host *host, u32 *cid)
+{
+ if (mmc_host_is_spi(host))
+ return mmc_spi_send_cid(host, cid);
+
+ return mmc_send_cxd_native(host, 0, cid, MMC_ALL_SEND_CID);
+}
+
int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
{
int err;
return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
}
-int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
+static int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
{
struct mmc_command cmd = {};
unsigned int opcode;
return 0;
}
+/**
+ * mmc_interrupt_hpi - Issue for High priority Interrupt
+ * @card: the MMC card associated with the HPI transfer
+ *
+ * Issued High Priority Interrupt, and check for card status
+ * until out-of prg-state.
+ */
+int mmc_interrupt_hpi(struct mmc_card *card)
+{
+ int err;
+ u32 status;
+ unsigned long prg_wait;
+
+ if (!card->ext_csd.hpi_en) {
+ pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
+ return 1;
+ }
+
+ mmc_claim_host(card->host);
+ err = mmc_send_status(card, &status);
+ if (err) {
+ pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
+ goto out;
+ }
+
+ switch (R1_CURRENT_STATE(status)) {
+ case R1_STATE_IDLE:
+ case R1_STATE_READY:
+ case R1_STATE_STBY:
+ case R1_STATE_TRAN:
+ /*
+ * In idle and transfer states, HPI is not needed and the caller
+ * can issue the next intended command immediately
+ */
+ goto out;
+ case R1_STATE_PRG:
+ break;
+ default:
+ /* In all other states, it's illegal to issue HPI */
+ pr_debug("%s: HPI cannot be sent. Card state=%d\n",
+ mmc_hostname(card->host), R1_CURRENT_STATE(status));
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = mmc_send_hpi_cmd(card, &status);
+ if (err)
+ goto out;
+
+ prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
+ do {
+ err = mmc_send_status(card, &status);
+
+ if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
+ break;
+ if (time_after(jiffies, prg_wait))
+ err = -ETIMEDOUT;
+ } while (!err);
+
+out:
+ mmc_release_host(card->host);
+ return err;
+}
+
int mmc_can_ext_csd(struct mmc_card *card)
{
return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
}
+/**
+ * mmc_stop_bkops - stop ongoing BKOPS
+ * @card: MMC card to check BKOPS
+ *
+ * Send HPI command to stop ongoing background operations to
+ * allow rapid servicing of foreground operations, e.g. read/
+ * writes. Wait until the card comes out of the programming state
+ * to avoid errors in servicing read/write requests.
+ */
+int mmc_stop_bkops(struct mmc_card *card)
+{
+ int err = 0;
+
+ err = mmc_interrupt_hpi(card);
+
+ /*
+ * If err is EINVAL, we can't issue an HPI.
+ * It should complete the BKOPS.
+ */
+ if (!err || (err == -EINVAL)) {
+ mmc_card_clr_doing_bkops(card);
+ mmc_retune_release(card->host);
+ err = 0;
+ }
+
+ return err;
+}
+
+static int mmc_read_bkops_status(struct mmc_card *card)
+{
+ int err;
+ u8 *ext_csd;
+
+ mmc_claim_host(card->host);
+ err = mmc_get_ext_csd(card, &ext_csd);
+ mmc_release_host(card->host);
+ if (err)
+ return err;
+
+ card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
+ card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
+ kfree(ext_csd);
+ return 0;
+}
+
+/**
+ * mmc_start_bkops - start BKOPS for supported cards
+ * @card: MMC card to start BKOPS
+ * @form_exception: A flag to indicate if this function was
+ * called due to an exception raised by the card
+ *
+ * Start background operations whenever requested.
+ * When the urgent BKOPS bit is set in a R1 command response
+ * then background operations should be started immediately.
+*/
+void mmc_start_bkops(struct mmc_card *card, bool from_exception)
+{
+ int err;
+ int timeout;
+ bool use_busy_signal;
+
+ if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
+ return;
+
+ err = mmc_read_bkops_status(card);
+ if (err) {
+ pr_err("%s: Failed to read bkops status: %d\n",
+ mmc_hostname(card->host), err);
+ return;
+ }
+
+ if (!card->ext_csd.raw_bkops_status)
+ return;
+
+ if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
+ from_exception)
+ return;
+
+ mmc_claim_host(card->host);
+ if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
+ timeout = MMC_OPS_TIMEOUT_MS;
+ use_busy_signal = true;
+ } else {
+ timeout = 0;
+ use_busy_signal = false;
+ }
+
+ mmc_retune_hold(card->host);
+
+ err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_BKOPS_START, 1, timeout, 0,
+ use_busy_signal, true, false);
+ if (err) {
+ pr_warn("%s: Error %d starting bkops\n",
+ mmc_hostname(card->host), err);
+ mmc_retune_release(card->host);
+ goto out;
+ }
+
+ /*
+ * For urgent bkops status (LEVEL_2 and more)
+ * bkops executed synchronously, otherwise
+ * the operation is in progress
+ */
+ if (!use_busy_signal)
+ mmc_card_set_doing_bkops(card);
+ else
+ mmc_retune_release(card->host);
+out:
+ mmc_release_host(card->host);
+}
+
+/*
+ * Flush the cache to the non-volatile storage.
+ */
+int mmc_flush_cache(struct mmc_card *card)
+{
+ int err = 0;
+
+ if (mmc_card_mmc(card) &&
+ (card->ext_csd.cache_size > 0) &&
+ (card->ext_csd.cache_ctrl & 1)) {
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_FLUSH_CACHE, 1, 0);
+ if (err)
+ pr_err("%s: cache flush error %d\n",
+ mmc_hostname(card->host), err);
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(mmc_flush_cache);
+
static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
{
u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
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