--- /dev/null
+/*
+ * linux/drivers/mmc/core/mmc_ops.h
+ *
+ * Copyright 2006-2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#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 "mmc_ops.h"
+
+#define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
+
+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,
+};
+
+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;
+ struct mmc_command cmd = {0};
+
+ BUG_ON(!host);
+
+ 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;
+ }
+
+ err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+int mmc_select_card(struct mmc_card *card)
+{
+ BUG_ON(!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 = {0};
+
+ 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 = {0};
+
+ /*
+ * 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 = {0};
+ int i, err = 0;
+
+ BUG_ON(!host);
+
+ 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;
+
+ /* if we're just probing, do a single pass */
+ if (ocr == 0)
+ break;
+
+ /* otherwise 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);
+ }
+
+ if (rocr && !mmc_host_is_spi(host))
+ *rocr = cmd.resp[0];
+
+ return err;
+}
+
+int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
+{
+ int err;
+ struct mmc_command cmd = {0};
+
+ BUG_ON(!host);
+ BUG_ON(!cid);
+
+ 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)
+{
+ int err;
+ struct mmc_command cmd = {0};
+
+ BUG_ON(!card);
+ BUG_ON(!card->host);
+
+ cmd.opcode = MMC_SET_RELATIVE_ADDR;
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+ err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static int
+mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
+{
+ int err;
+ struct mmc_command cmd = {0};
+
+ BUG_ON(!host);
+ BUG_ON(!cxd);
+
+ 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 = {NULL};
+ struct mmc_command cmd = {0};
+ struct mmc_data data = {0};
+ 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;
+}
+
+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);
+
+ 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_cid(struct mmc_host *host, u32 *cid)
+{
+ int ret, i;
+ u32 *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;
+
+ 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_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 = {0};
+ 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 = {0};
+ 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;
+}
+
+/**
+ * __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, bool use_busy_signal, bool send_status,
+ bool ignore_crc)
+{
+ struct mmc_host *host = card->host;
+ int err;
+ struct mmc_command cmd = {0};
+ unsigned long timeout;
+ u32 status = 0;
+ bool use_r1b_resp = use_busy_signal;
+
+ /*
+ * 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_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;
+ }
+
+ if (index == EXT_CSD_SANITIZE_START)
+ cmd.sanitize_busy = true;
+
+ err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+ if (err)
+ return err;
+
+ /* 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 {
+ 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(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(host)) {
+ if (status & R1_SPI_ILLEGAL_COMMAND)
+ return -EBADMSG;
+ } else {
+ if (status & 0xFDFFA000)
+ 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);
+
+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, true, true,
+ false);
+}
+EXPORT_SYMBOL_GPL(mmc_switch);
+
+int mmc_send_tuning(struct mmc_host *host)
+{
+ struct mmc_request mrq = {NULL};
+ struct mmc_command cmd = {0};
+ struct mmc_data data = {0};
+ struct scatterlist sg;
+ struct mmc_ios *ios = &host->ios;
+ const u8 *tuning_block_pattern;
+ int size, err = 0;
+ u8 *data_buf;
+ u32 opcode;
+
+ if (ios->bus_width == MMC_BUS_WIDTH_8) {
+ tuning_block_pattern = tuning_blk_pattern_8bit;
+ size = sizeof(tuning_blk_pattern_8bit);
+ opcode = MMC_SEND_TUNING_BLOCK_HS200;
+ } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
+ tuning_block_pattern = tuning_blk_pattern_4bit;
+ size = sizeof(tuning_blk_pattern_4bit);
+ opcode = MMC_SEND_TUNING_BLOCK;
+ } 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) {
+ 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);
+
+static int
+mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
+ u8 len)
+{
+ struct mmc_request mrq = {NULL};
+ struct mmc_command cmd = {0};
+ struct mmc_data data = {0};
+ 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 err, 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);
+ 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;
+ int err;
+
+ if (!card->ext_csd.hpi) {
+ pr_warn("%s: Card didn't support HPI command\n",
+ mmc_hostname(card->host));
+ return -EINVAL;
+ }
+
+ opcode = card->ext_csd.hpi_cmd;
+ if (opcode == MMC_STOP_TRANSMISSION)
+ cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
+ else if (opcode == MMC_SEND_STATUS)
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+ cmd.opcode = opcode;
+ cmd.arg = card->rca << 16 | 1;
+
+ 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;
+}
+
+int mmc_can_ext_csd(struct mmc_card *card)
+{
+ return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
+}
Code Review / kvmfornfv.git / blobdiff