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path: root/drivers/mmc/core/sdio_ops.c
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Diffstat (limited to 'drivers/mmc/core/sdio_ops.c')
-rw-r--r--drivers/mmc/core/sdio_ops.c217
1 files changed, 217 insertions, 0 deletions
diff --git a/drivers/mmc/core/sdio_ops.c b/drivers/mmc/core/sdio_ops.c
new file mode 100644
index 000000000..4c229dd2b
--- /dev/null
+++ b/drivers/mmc/core/sdio_ops.c
@@ -0,0 +1,217 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * linux/drivers/mmc/sdio_ops.c
+ *
+ * Copyright 2006-2007 Pierre Ossman
+ */
+
+#include <linux/scatterlist.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sdio.h>
+
+#include "core.h"
+#include "sdio_ops.h"
+
+int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
+{
+ struct mmc_command cmd = {};
+ int i, err = 0;
+
+ cmd.opcode = SD_IO_SEND_OP_COND;
+ cmd.arg = ocr;
+ cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
+
+ for (i = 100; i; i--) {
+ err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+ 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)) {
+ /*
+ * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
+ * an initialized card under SPI, but some cards
+ * (Marvell's) only behave when looking at this
+ * one.
+ */
+ if (cmd.resp[1] & MMC_CARD_BUSY)
+ break;
+ } else {
+ if (cmd.resp[0] & MMC_CARD_BUSY)
+ break;
+ }
+
+ err = -ETIMEDOUT;
+
+ mmc_delay(10);
+ }
+
+ if (rocr)
+ *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
+
+ return err;
+}
+
+static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
+ unsigned addr, u8 in, u8 *out)
+{
+ struct mmc_command cmd = {};
+ int err;
+
+ if (fn > 7)
+ return -EINVAL;
+
+ /* sanity check */
+ if (addr & ~0x1FFFF)
+ return -EINVAL;
+
+ cmd.opcode = SD_IO_RW_DIRECT;
+ cmd.arg = write ? 0x80000000 : 0x00000000;
+ cmd.arg |= fn << 28;
+ cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
+ cmd.arg |= addr << 9;
+ cmd.arg |= in;
+ cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
+
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+ if (err)
+ return err;
+
+ if (mmc_host_is_spi(host)) {
+ /* host driver already reported errors */
+ } else {
+ if (cmd.resp[0] & R5_ERROR)
+ return -EIO;
+ if (cmd.resp[0] & R5_FUNCTION_NUMBER)
+ return -EINVAL;
+ if (cmd.resp[0] & R5_OUT_OF_RANGE)
+ return -ERANGE;
+ }
+
+ if (out) {
+ if (mmc_host_is_spi(host))
+ *out = (cmd.resp[0] >> 8) & 0xFF;
+ else
+ *out = cmd.resp[0] & 0xFF;
+ }
+
+ return 0;
+}
+
+int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
+ unsigned addr, u8 in, u8 *out)
+{
+ return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
+}
+
+int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
+ unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
+{
+ struct mmc_request mrq = {};
+ struct mmc_command cmd = {};
+ struct mmc_data data = {};
+ struct scatterlist sg, *sg_ptr;
+ struct sg_table sgtable;
+ unsigned int nents, left_size, i;
+ unsigned int seg_size = card->host->max_seg_size;
+ int err;
+
+ WARN_ON(blksz == 0);
+
+ /* sanity check */
+ if (addr & ~0x1FFFF)
+ return -EINVAL;
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ cmd.opcode = SD_IO_RW_EXTENDED;
+ cmd.arg = write ? 0x80000000 : 0x00000000;
+ cmd.arg |= fn << 28;
+ cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
+ cmd.arg |= addr << 9;
+ if (blocks == 0)
+ cmd.arg |= (blksz == 512) ? 0 : blksz; /* byte mode */
+ else
+ cmd.arg |= 0x08000000 | blocks; /* block mode */
+ cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
+
+ data.blksz = blksz;
+ /* Code in host drivers/fwk assumes that "blocks" always is >=1 */
+ data.blocks = blocks ? blocks : 1;
+ data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
+
+ left_size = data.blksz * data.blocks;
+ nents = DIV_ROUND_UP(left_size, seg_size);
+ if (nents > 1) {
+ if (sg_alloc_table(&sgtable, nents, GFP_KERNEL))
+ return -ENOMEM;
+
+ data.sg = sgtable.sgl;
+ data.sg_len = nents;
+
+ for_each_sg(data.sg, sg_ptr, data.sg_len, i) {
+ sg_set_buf(sg_ptr, buf + i * seg_size,
+ min(seg_size, left_size));
+ left_size -= seg_size;
+ }
+ } else {
+ data.sg = &sg;
+ data.sg_len = 1;
+
+ sg_init_one(&sg, buf, left_size);
+ }
+
+ mmc_set_data_timeout(&data, card);
+
+ mmc_pre_req(card->host, &mrq);
+
+ mmc_wait_for_req(card->host, &mrq);
+
+ if (cmd.error)
+ err = cmd.error;
+ else if (data.error)
+ err = data.error;
+ else if (mmc_host_is_spi(card->host))
+ /* host driver already reported errors */
+ err = 0;
+ else if (cmd.resp[0] & R5_ERROR)
+ err = -EIO;
+ else if (cmd.resp[0] & R5_FUNCTION_NUMBER)
+ err = -EINVAL;
+ else if (cmd.resp[0] & R5_OUT_OF_RANGE)
+ err = -ERANGE;
+ else
+ err = 0;
+
+ mmc_post_req(card->host, &mrq, err);
+
+ if (nents > 1)
+ sg_free_table(&sgtable);
+
+ return err;
+}
+
+int sdio_reset(struct mmc_host *host)
+{
+ int ret;
+ u8 abort;
+
+ /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
+
+ ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
+ if (ret)
+ abort = 0x08;
+ else
+ abort |= 0x08;
+
+ return mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
+}
+