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-rw-r--r--drivers/mmc/core/mmc_ops.c1065
1 files changed, 1065 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
new file mode 100644
index 000000000..b6bb7f7fa
--- /dev/null
+++ b/drivers/mmc/core/mmc_ops.c
@@ -0,0 +1,1065 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * linux/drivers/mmc/core/mmc_ops.h
+ *
+ * Copyright 2006-2007 Pierre Ossman
+ */
+
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/types.h>
+#include <linux/scatterlist.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/mmc.h>
+
+#include "core.h"
+#include "card.h"
+#include "host.h"
+#include "mmc_ops.h"
+
+#define MMC_BKOPS_TIMEOUT_MS (120 * 1000) /* 120s */
+#define MMC_CACHE_FLUSH_TIMEOUT_MS (30 * 1000) /* 30s */
+#define MMC_SANITIZE_TIMEOUT_MS (240 * 1000) /* 240s */
+
+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_status(struct mmc_card *card, u32 *status, unsigned int retries)
+{
+ int err;
+ struct mmc_command cmd = {};
+
+ 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, 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;
+}
+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);
+}
+EXPORT_SYMBOL_GPL(mmc_send_status);
+
+static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
+{
+ struct mmc_command cmd = {};
+
+ cmd.opcode = MMC_SELECT_CARD;
+
+ if (card) {
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+ } else {
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
+ }
+
+ return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+}
+
+int mmc_select_card(struct mmc_card *card)
+{
+
+ return _mmc_select_card(card->host, card);
+}
+
+int mmc_deselect_cards(struct mmc_host *host)
+{
+ return _mmc_select_card(host, NULL);
+}
+
+/*
+ * Write the value specified in the device tree or board code into the optional
+ * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
+ * drive strength of the DAT and CMD outputs. The actual meaning of a given
+ * value is hardware dependant.
+ * The presence of the DSR register can be determined from the CSD register,
+ * bit 76.
+ */
+int mmc_set_dsr(struct mmc_host *host)
+{
+ struct mmc_command cmd = {};
+
+ cmd.opcode = MMC_SET_DSR;
+
+ cmd.arg = (host->dsr << 16) | 0xffff;
+ cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
+
+ return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+}
+
+int mmc_go_idle(struct mmc_host *host)
+{
+ int err;
+ struct mmc_command cmd = {};
+
+ /*
+ * Non-SPI hosts need to prevent chipselect going active during
+ * GO_IDLE; that would put chips into SPI mode. Remind them of
+ * that in case of hardware that won't pull up DAT3/nCS otherwise.
+ *
+ * SPI hosts ignore ios.chip_select; it's managed according to
+ * rules that must accommodate non-MMC slaves which this layer
+ * won't even know about.
+ */
+ if (!mmc_host_is_spi(host)) {
+ mmc_set_chip_select(host, MMC_CS_HIGH);
+ mmc_delay(1);
+ }
+
+ cmd.opcode = MMC_GO_IDLE_STATE;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
+
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+
+ mmc_delay(1);
+
+ if (!mmc_host_is_spi(host)) {
+ mmc_set_chip_select(host, MMC_CS_DONTCARE);
+ mmc_delay(1);
+ }
+
+ host->use_spi_crc = 0;
+
+ return err;
+}
+
+int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
+{
+ struct mmc_command cmd = {};
+ int i, err = 0;
+
+ cmd.opcode = MMC_SEND_OP_COND;
+ cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
+
+ for (i = 100; i; i--) {
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+ if (err)
+ break;
+
+ /* wait until reset completes */
+ if (mmc_host_is_spi(host)) {
+ if (!(cmd.resp[0] & R1_SPI_IDLE))
+ break;
+ } else {
+ if (cmd.resp[0] & MMC_CARD_BUSY)
+ break;
+ }
+
+ err = -ETIMEDOUT;
+
+ mmc_delay(10);
+
+ /*
+ * According to eMMC specification v5.1 section 6.4.3, we
+ * should issue CMD1 repeatedly in the idle state until
+ * the eMMC is ready. Otherwise some eMMC devices seem to enter
+ * the inactive mode after mmc_init_card() issued CMD0 when
+ * the eMMC device is busy.
+ */
+ if (!ocr && !mmc_host_is_spi(host))
+ cmd.arg = cmd.resp[0] | BIT(30);
+ }
+
+ if (rocr && !mmc_host_is_spi(host))
+ *rocr = cmd.resp[0];
+
+ return err;
+}
+
+int mmc_set_relative_addr(struct mmc_card *card)
+{
+ struct mmc_command cmd = {};
+
+ cmd.opcode = MMC_SET_RELATIVE_ADDR;
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+ return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
+}
+
+static int
+mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
+{
+ int err;
+ struct mmc_command cmd = {};
+
+ cmd.opcode = opcode;
+ cmd.arg = arg;
+ cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
+
+ err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+ if (err)
+ return err;
+
+ memcpy(cxd, cmd.resp, sizeof(u32) * 4);
+
+ 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)
+{
+ struct mmc_request mrq = {};
+ struct mmc_command cmd = {};
+ struct mmc_data data = {};
+ struct scatterlist sg;
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ cmd.opcode = opcode;
+ cmd.arg = 0;
+
+ /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
+ * rely on callers to never use this with "native" calls for reading
+ * CSD or CID. Native versions of those commands use the R2 type,
+ * not R1 plus a data block.
+ */
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ data.blksz = len;
+ data.blocks = 1;
+ data.flags = MMC_DATA_READ;
+ data.sg = &sg;
+ data.sg_len = 1;
+
+ sg_init_one(&sg, buf, len);
+
+ if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
+ /*
+ * The spec states that CSR and CID accesses have a timeout
+ * of 64 clock cycles.
+ */
+ data.timeout_ns = 0;
+ data.timeout_clks = 64;
+ } else
+ mmc_set_data_timeout(&data, card);
+
+ mmc_wait_for_req(host, &mrq);
+
+ if (cmd.error)
+ return cmd.error;
+ if (data.error)
+ return data.error;
+
+ return 0;
+}
+
+static int mmc_spi_send_csd(struct mmc_card *card, u32 *csd)
+{
+ int ret, i;
+ __be32 *csd_tmp;
+
+ csd_tmp = kzalloc(16, GFP_KERNEL);
+ if (!csd_tmp)
+ return -ENOMEM;
+
+ ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
+ if (ret)
+ goto err;
+
+ for (i = 0; i < 4; i++)
+ csd[i] = be32_to_cpu(csd_tmp[i]);
+
+err:
+ kfree(csd_tmp);
+ return ret;
+}
+
+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;
+
+ cid_tmp = kzalloc(16, GFP_KERNEL);
+ if (!cid_tmp)
+ return -ENOMEM;
+
+ ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
+ if (ret)
+ goto err;
+
+ for (i = 0; i < 4; i++)
+ cid[i] = be32_to_cpu(cid_tmp[i]);
+
+err:
+ kfree(cid_tmp);
+ 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;
+ u8 *ext_csd;
+
+ if (!card || !new_ext_csd)
+ return -EINVAL;
+
+ if (!mmc_can_ext_csd(card))
+ return -EOPNOTSUPP;
+
+ /*
+ * As the ext_csd is so large and mostly unused, we don't store the
+ * raw block in mmc_card.
+ */
+ ext_csd = kzalloc(512, GFP_KERNEL);
+ if (!ext_csd)
+ return -ENOMEM;
+
+ err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
+ 512);
+ if (err)
+ kfree(ext_csd);
+ else
+ *new_ext_csd = ext_csd;
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
+
+int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
+{
+ struct mmc_command cmd = {};
+ int err;
+
+ cmd.opcode = MMC_SPI_READ_OCR;
+ cmd.arg = highcap ? (1 << 30) : 0;
+ cmd.flags = MMC_RSP_SPI_R3;
+
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+
+ *ocrp = cmd.resp[1];
+ return err;
+}
+
+int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
+{
+ struct mmc_command cmd = {};
+ int err;
+
+ cmd.opcode = MMC_SPI_CRC_ON_OFF;
+ cmd.flags = MMC_RSP_SPI_R1;
+ cmd.arg = use_crc;
+
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+ if (!err)
+ host->use_spi_crc = use_crc;
+ return err;
+}
+
+static int mmc_switch_status_error(struct mmc_host *host, u32 status)
+{
+ if (mmc_host_is_spi(host)) {
+ if (status & R1_SPI_ILLEGAL_COMMAND)
+ return -EBADMSG;
+ } else {
+ if (R1_STATUS(status))
+ pr_warn("%s: unexpected status %#x after switch\n",
+ mmc_hostname(host), status);
+ if (status & R1_SWITCH_ERROR)
+ return -EBADMSG;
+ }
+ return 0;
+}
+
+/* Caller must hold re-tuning */
+int mmc_switch_status(struct mmc_card *card, bool crc_err_fatal)
+{
+ u32 status;
+ int err;
+
+ err = mmc_send_status(card, &status);
+ if (!crc_err_fatal && err == -EILSEQ)
+ return 0;
+ if (err)
+ return err;
+
+ return mmc_switch_status_error(card->host, status);
+}
+
+static int mmc_busy_status(struct mmc_card *card, bool retry_crc_err,
+ enum mmc_busy_cmd busy_cmd, bool *busy)
+{
+ struct mmc_host *host = card->host;
+ u32 status = 0;
+ int err;
+
+ if (busy_cmd != MMC_BUSY_IO && host->ops->card_busy) {
+ *busy = host->ops->card_busy(host);
+ return 0;
+ }
+
+ err = mmc_send_status(card, &status);
+ if (retry_crc_err && err == -EILSEQ) {
+ *busy = true;
+ return 0;
+ }
+ if (err)
+ return err;
+
+ switch (busy_cmd) {
+ case MMC_BUSY_CMD6:
+ err = mmc_switch_status_error(card->host, status);
+ break;
+ case MMC_BUSY_ERASE:
+ err = R1_STATUS(status) ? -EIO : 0;
+ break;
+ case MMC_BUSY_HPI:
+ case MMC_BUSY_IO:
+ break;
+ default:
+ err = -EINVAL;
+ }
+
+ if (err)
+ return err;
+
+ *busy = !mmc_ready_for_data(status);
+ return 0;
+}
+
+static int __mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
+ bool send_status, bool retry_crc_err,
+ enum mmc_busy_cmd busy_cmd)
+{
+ struct mmc_host *host = card->host;
+ int err;
+ unsigned long timeout;
+ unsigned int udelay = 32, udelay_max = 32768;
+ bool expired = false;
+ bool busy = false;
+
+ /*
+ * In cases when not allowed to poll by using CMD13 or because we aren't
+ * capable of polling by using ->card_busy(), then rely on waiting the
+ * stated timeout to be sufficient.
+ */
+ if (!send_status && !host->ops->card_busy) {
+ mmc_delay(timeout_ms);
+ return 0;
+ }
+
+ timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
+ do {
+ /*
+ * Due to the possibility of being preempted while polling,
+ * check the expiration time first.
+ */
+ expired = time_after(jiffies, timeout);
+
+ err = mmc_busy_status(card, retry_crc_err, busy_cmd, &busy);
+ if (err)
+ return err;
+
+ /* Timeout if the device still remains busy. */
+ if (expired && busy) {
+ pr_err("%s: Card stuck being busy! %s\n",
+ mmc_hostname(host), __func__);
+ return -ETIMEDOUT;
+ }
+
+ /* Throttle the polling rate to avoid hogging the CPU. */
+ if (busy) {
+ usleep_range(udelay, udelay * 2);
+ if (udelay < udelay_max)
+ udelay *= 2;
+ }
+ } while (busy);
+
+ return 0;
+}
+
+int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
+ enum mmc_busy_cmd busy_cmd)
+{
+ return __mmc_poll_for_busy(card, timeout_ms, true, false, busy_cmd);
+}
+
+/**
+ * __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
+ * @timing: new timing to change to
+ * @send_status: send status cmd to poll for busy
+ * @retry_crc_err: retry when CRC errors when polling with CMD13 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, unsigned char timing,
+ bool send_status, bool retry_crc_err)
+{
+ struct mmc_host *host = card->host;
+ int err;
+ struct mmc_command cmd = {};
+ bool use_r1b_resp = true;
+ unsigned char old_timing = host->ios.timing;
+
+ mmc_retune_hold(host);
+
+ if (!timeout_ms) {
+ pr_warn("%s: unspecified timeout for CMD6 - use generic\n",
+ mmc_hostname(host));
+ timeout_ms = card->ext_csd.generic_cmd6_time;
+ }
+
+ /*
+ * If the max_busy_timeout of the host is specified, make sure it's
+ * enough to fit the used timeout_ms. In case it's not, let's instruct
+ * the host to avoid HW busy detection, by converting to a R1 response
+ * instead of a R1B. Note, some hosts requires R1B, which also means
+ * they are on their own when it comes to deal with the busy timeout.
+ */
+ if (!(host->caps & MMC_CAP_NEED_RSP_BUSY) && 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_CMD_AC;
+ if (use_r1b_resp) {
+ cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
+ cmd.busy_timeout = timeout_ms;
+ } else {
+ cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
+ }
+
+ err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+ if (err)
+ goto out;
+
+ /*If SPI or used HW busy detection above, then we don't need to poll. */
+ if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
+ mmc_host_is_spi(host))
+ goto out_tim;
+
+ /* Let's try to poll to find out when the command is completed. */
+ err = __mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err,
+ MMC_BUSY_CMD6);
+ if (err)
+ goto out;
+
+out_tim:
+ /* Switch to new timing before check switch status. */
+ if (timing)
+ mmc_set_timing(host, timing);
+
+ if (send_status) {
+ err = mmc_switch_status(card, true);
+ if (err && timing)
+ mmc_set_timing(host, old_timing);
+ }
+out:
+ mmc_retune_release(host);
+
+ return err;
+}
+
+int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
+ unsigned int timeout_ms)
+{
+ return __mmc_switch(card, set, index, value, timeout_ms, 0,
+ true, false);
+}
+EXPORT_SYMBOL_GPL(mmc_switch);
+
+int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
+{
+ struct mmc_request mrq = {};
+ struct mmc_command cmd = {};
+ struct mmc_data data = {};
+ struct scatterlist sg;
+ struct mmc_ios *ios = &host->ios;
+ const u8 *tuning_block_pattern;
+ int size, err = 0;
+ u8 *data_buf;
+
+ if (ios->bus_width == MMC_BUS_WIDTH_8) {
+ tuning_block_pattern = tuning_blk_pattern_8bit;
+ size = sizeof(tuning_blk_pattern_8bit);
+ } else if (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 = kzalloc(size, GFP_KERNEL);
+ if (!data_buf)
+ return -ENOMEM;
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ cmd.opcode = opcode;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ data.blksz = 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;
+
+ data.sg = &sg;
+ data.sg_len = 1;
+ sg_init_one(&sg, data_buf, size);
+
+ mmc_wait_for_req(host, &mrq);
+
+ if (cmd_error)
+ *cmd_error = cmd.error;
+
+ if (cmd.error) {
+ err = cmd.error;
+ goto out;
+ }
+
+ if (data.error) {
+ err = data.error;
+ goto out;
+ }
+
+ if (memcmp(data_buf, tuning_block_pattern, size))
+ err = -EIO;
+
+out:
+ kfree(data_buf);
+ return err;
+}
+EXPORT_SYMBOL_GPL(mmc_send_tuning);
+
+int mmc_abort_tuning(struct mmc_host *host, u32 opcode)
+{
+ struct mmc_command cmd = {};
+
+ /*
+ * eMMC specification specifies that CMD12 can be used to stop a tuning
+ * command, but SD specification does not, so do nothing unless it is
+ * eMMC.
+ */
+ if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
+ return 0;
+
+ cmd.opcode = MMC_STOP_TRANSMISSION;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
+
+ /*
+ * For drivers that override R1 to R1b, set an arbitrary timeout based
+ * on the tuning timeout i.e. 150ms.
+ */
+ cmd.busy_timeout = 150;
+
+ return mmc_wait_for_cmd(host, &cmd, 0);
+}
+EXPORT_SYMBOL_GPL(mmc_abort_tuning);
+
+static int
+mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
+ u8 len)
+{
+ struct mmc_request mrq = {};
+ struct mmc_command cmd = {};
+ struct mmc_data data = {};
+ struct scatterlist sg;
+ u8 *data_buf;
+ u8 *test_buf;
+ int i, err;
+ static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
+ static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
+
+ /* 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;
+
+ if (len == 8)
+ test_buf = testdata_8bit;
+ else if (len == 4)
+ test_buf = testdata_4bit;
+ else {
+ pr_err("%s: Invalid bus_width %d\n",
+ mmc_hostname(host), len);
+ kfree(data_buf);
+ return -EINVAL;
+ }
+
+ if (opcode == MMC_BUS_TEST_W)
+ memcpy(data_buf, test_buf, len);
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+ cmd.opcode = opcode;
+ cmd.arg = 0;
+
+ /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
+ * rely on callers to never use this with "native" calls for reading
+ * CSD or CID. Native versions of those commands use the R2 type,
+ * not R1 plus a data block.
+ */
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ data.blksz = len;
+ data.blocks = 1;
+ if (opcode == MMC_BUS_TEST_R)
+ data.flags = MMC_DATA_READ;
+ else
+ data.flags = MMC_DATA_WRITE;
+
+ 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;
+ if (opcode == MMC_BUS_TEST_R) {
+ for (i = 0; i < len / 4; i++)
+ if ((test_buf[i] ^ data_buf[i]) != 0xff) {
+ err = -EIO;
+ break;
+ }
+ }
+ kfree(data_buf);
+
+ if (cmd.error)
+ return cmd.error;
+ if (data.error)
+ return data.error;
+
+ return err;
+}
+
+int mmc_bus_test(struct mmc_card *card, u8 bus_width)
+{
+ int width;
+
+ if (bus_width == MMC_BUS_WIDTH_8)
+ width = 8;
+ else if (bus_width == MMC_BUS_WIDTH_4)
+ width = 4;
+ else if (bus_width == MMC_BUS_WIDTH_1)
+ return 0; /* no need for test */
+ else
+ return -EINVAL;
+
+ /*
+ * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
+ * is a problem. This improves chances that the test will work.
+ */
+ mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
+ return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
+}
+
+static int mmc_send_hpi_cmd(struct mmc_card *card)
+{
+ unsigned int busy_timeout_ms = card->ext_csd.out_of_int_time;
+ struct mmc_host *host = card->host;
+ bool use_r1b_resp = true;
+ struct mmc_command cmd = {};
+ int err;
+
+ cmd.opcode = card->ext_csd.hpi_cmd;
+ cmd.arg = card->rca << 16 | 1;
+
+ /*
+ * Make sure the host's max_busy_timeout fit the needed timeout for HPI.
+ * In case it doesn't, let's instruct the host to avoid HW busy
+ * detection, by using a R1 response instead of R1B.
+ */
+ if (host->max_busy_timeout && busy_timeout_ms > host->max_busy_timeout)
+ use_r1b_resp = false;
+
+ if (cmd.opcode == MMC_STOP_TRANSMISSION && use_r1b_resp) {
+ cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
+ cmd.busy_timeout = busy_timeout_ms;
+ } else {
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+ use_r1b_resp = false;
+ }
+
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+ if (err) {
+ pr_warn("%s: HPI error %d. Command response %#x\n",
+ mmc_hostname(host), err, cmd.resp[0]);
+ return err;
+ }
+
+ /* No need to poll when using HW busy detection. */
+ if (host->caps & MMC_CAP_WAIT_WHILE_BUSY && use_r1b_resp)
+ return 0;
+
+ /* Let's poll to find out when the HPI request completes. */
+ return mmc_poll_for_busy(card, busy_timeout_ms, MMC_BUSY_HPI);
+}
+
+/**
+ * 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.
+ */
+static int mmc_interrupt_hpi(struct mmc_card *card)
+{
+ int err;
+ u32 status;
+
+ if (!card->ext_csd.hpi_en) {
+ pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
+ return 1;
+ }
+
+ 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);
+out:
+ return err;
+}
+
+int mmc_can_ext_csd(struct mmc_card *card)
+{
+ return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
+}
+
+static int mmc_read_bkops_status(struct mmc_card *card)
+{
+ int err;
+ u8 *ext_csd;
+
+ err = mmc_get_ext_csd(card, &ext_csd);
+ 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_run_bkops - Run BKOPS for supported cards
+ * @card: MMC card to run BKOPS for
+ *
+ * Run background operations synchronously for cards having manual BKOPS
+ * enabled and in case it reports urgent BKOPS level.
+*/
+void mmc_run_bkops(struct mmc_card *card)
+{
+ int err;
+
+ if (!card->ext_csd.man_bkops_en)
+ 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 ||
+ card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
+ return;
+
+ mmc_retune_hold(card->host);
+
+ /*
+ * For urgent BKOPS status, LEVEL_2 and higher, let's execute
+ * synchronously. Future wise, we may consider to start BKOPS, for less
+ * urgent levels by using an asynchronous background task, when idle.
+ */
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_BKOPS_START, 1, MMC_BKOPS_TIMEOUT_MS);
+ if (err)
+ pr_warn("%s: Error %d starting bkops\n",
+ mmc_hostname(card->host), err);
+
+ mmc_retune_release(card->host);
+}
+EXPORT_SYMBOL(mmc_run_bkops);
+
+/*
+ * Flush the cache to the non-volatile storage.
+ */
+int mmc_flush_cache(struct mmc_card *card)
+{
+ int err = 0;
+
+ if (mmc_cache_enabled(card->host)) {
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_FLUSH_CACHE, 1,
+ MMC_CACHE_FLUSH_TIMEOUT_MS);
+ 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;
+ int err;
+
+ if (!card->ext_csd.cmdq_support)
+ return -EOPNOTSUPP;
+
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
+ val, card->ext_csd.generic_cmd6_time);
+ if (!err)
+ card->ext_csd.cmdq_en = enable;
+
+ return err;
+}
+
+int mmc_cmdq_enable(struct mmc_card *card)
+{
+ return mmc_cmdq_switch(card, true);
+}
+EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
+
+int mmc_cmdq_disable(struct mmc_card *card)
+{
+ return mmc_cmdq_switch(card, false);
+}
+EXPORT_SYMBOL_GPL(mmc_cmdq_disable);
+
+int mmc_sanitize(struct mmc_card *card)
+{
+ struct mmc_host *host = card->host;
+ int err;
+
+ if (!mmc_can_sanitize(card)) {
+ pr_warn("%s: Sanitize not supported\n", mmc_hostname(host));
+ return -EOPNOTSUPP;
+ }
+
+ pr_debug("%s: Sanitize in progress...\n", mmc_hostname(host));
+
+ mmc_retune_hold(host);
+
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_SANITIZE_START,
+ 1, MMC_SANITIZE_TIMEOUT_MS);
+ if (err)
+ pr_err("%s: Sanitize failed err=%d\n", mmc_hostname(host), err);
+
+ /*
+ * If the sanitize operation timed out, the card is probably still busy
+ * in the R1_STATE_PRG. Rather than continue to wait, let's try to abort
+ * it with a HPI command to get back into R1_STATE_TRAN.
+ */
+ if (err == -ETIMEDOUT && !mmc_interrupt_hpi(card))
+ pr_warn("%s: Sanitize aborted\n", mmc_hostname(host));
+
+ mmc_retune_release(host);
+
+ pr_debug("%s: Sanitize completed\n", mmc_hostname(host));
+ return err;
+}
+EXPORT_SYMBOL_GPL(mmc_sanitize);