--- /dev/null
+/*
+ * linux/drivers/mmc/core/sd_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/types.h>
+#include <linux/export.h>
+#include <linux/scatterlist.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sd.h>
+
+#include "core.h"
+#include "sd_ops.h"
+
+int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
+{
+ int err;
+ struct mmc_command cmd = {0};
+
+ BUG_ON(!host);
+ BUG_ON(card && (card->host != host));
+
+ cmd.opcode = MMC_APP_CMD;
+
+ if (card) {
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
+ } else {
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
+ }
+
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+ if (err)
+ return err;
+
+ /* Check that card supported application commands */
+ if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
+ return -EOPNOTSUPP;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mmc_app_cmd);
+
+/**
+ * mmc_wait_for_app_cmd - start an application command and wait for
+ completion
+ * @host: MMC host to start command
+ * @card: Card to send MMC_APP_CMD to
+ * @cmd: MMC command to start
+ * @retries: maximum number of retries
+ *
+ * Sends a MMC_APP_CMD, checks the card response, sends the command
+ * in the parameter and waits for it to complete. Return any error
+ * that occurred while the command was executing. Do not attempt to
+ * parse the response.
+ */
+int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
+ struct mmc_command *cmd, int retries)
+{
+ struct mmc_request mrq = {NULL};
+
+ int i, err;
+
+ BUG_ON(!cmd);
+ BUG_ON(retries < 0);
+
+ err = -EIO;
+
+ /*
+ * We have to resend MMC_APP_CMD for each attempt so
+ * we cannot use the retries field in mmc_command.
+ */
+ for (i = 0;i <= retries;i++) {
+ err = mmc_app_cmd(host, card);
+ if (err) {
+ /* no point in retrying; no APP commands allowed */
+ if (mmc_host_is_spi(host)) {
+ if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
+ break;
+ }
+ continue;
+ }
+
+ memset(&mrq, 0, sizeof(struct mmc_request));
+
+ memset(cmd->resp, 0, sizeof(cmd->resp));
+ cmd->retries = 0;
+
+ mrq.cmd = cmd;
+ cmd->data = NULL;
+
+ mmc_wait_for_req(host, &mrq);
+
+ err = cmd->error;
+ if (!cmd->error)
+ break;
+
+ /* no point in retrying illegal APP commands */
+ if (mmc_host_is_spi(host)) {
+ if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
+ break;
+ }
+ }
+
+ return err;
+}
+
+EXPORT_SYMBOL(mmc_wait_for_app_cmd);
+
+int mmc_app_set_bus_width(struct mmc_card *card, int width)
+{
+ int err;
+ struct mmc_command cmd = {0};
+
+ BUG_ON(!card);
+ BUG_ON(!card->host);
+
+ cmd.opcode = SD_APP_SET_BUS_WIDTH;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+ switch (width) {
+ case MMC_BUS_WIDTH_1:
+ cmd.arg = SD_BUS_WIDTH_1;
+ break;
+ case MMC_BUS_WIDTH_4:
+ cmd.arg = SD_BUS_WIDTH_4;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
+{
+ struct mmc_command cmd = {0};
+ int i, err = 0;
+
+ BUG_ON(!host);
+
+ cmd.opcode = SD_APP_OP_COND;
+ if (mmc_host_is_spi(host))
+ cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
+ else
+ cmd.arg = ocr;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
+
+ for (i = 100; i; i--) {
+ err = mmc_wait_for_app_cmd(host, NULL, &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)) {
+ if (!(cmd.resp[0] & R1_SPI_IDLE))
+ break;
+ } else {
+ if (cmd.resp[0] & MMC_CARD_BUSY)
+ break;
+ }
+
+ err = -ETIMEDOUT;
+
+ mmc_delay(10);
+ }
+
+ if (!i)
+ pr_err("%s: card never left busy state\n", mmc_hostname(host));
+
+ if (rocr && !mmc_host_is_spi(host))
+ *rocr = cmd.resp[0];
+
+ return err;
+}
+
+int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
+{
+ struct mmc_command cmd = {0};
+ int err;
+ static const u8 test_pattern = 0xAA;
+ u8 result_pattern;
+
+ /*
+ * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
+ * before SD_APP_OP_COND. This command will harmlessly fail for
+ * SD 1.0 cards.
+ */
+ cmd.opcode = SD_SEND_IF_COND;
+ cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
+ cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
+
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+ if (err)
+ return err;
+
+ if (mmc_host_is_spi(host))
+ result_pattern = cmd.resp[1] & 0xFF;
+ else
+ result_pattern = cmd.resp[0] & 0xFF;
+
+ if (result_pattern != test_pattern)
+ return -EIO;
+
+ return 0;
+}
+
+int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
+{
+ int err;
+ struct mmc_command cmd = {0};
+
+ BUG_ON(!host);
+ BUG_ON(!rca);
+
+ cmd.opcode = SD_SEND_RELATIVE_ADDR;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
+
+ err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+ if (err)
+ return err;
+
+ *rca = cmd.resp[0] >> 16;
+
+ return 0;
+}
+
+int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
+{
+ int err;
+ struct mmc_request mrq = {NULL};
+ struct mmc_command cmd = {0};
+ struct mmc_data data = {0};
+ struct scatterlist sg;
+ void *data_buf;
+
+ BUG_ON(!card);
+ BUG_ON(!card->host);
+ BUG_ON(!scr);
+
+ /* NOTE: caller guarantees scr is heap-allocated */
+
+ err = mmc_app_cmd(card->host, card);
+ if (err)
+ return err;
+
+ /* dma onto stack is unsafe/nonportable, but callers to this
+ * routine normally provide temporary on-stack buffers ...
+ */
+ data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
+ if (data_buf == NULL)
+ return -ENOMEM;
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ cmd.opcode = SD_APP_SEND_SCR;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ data.blksz = 8;
+ data.blocks = 1;
+ data.flags = MMC_DATA_READ;
+ data.sg = &sg;
+ data.sg_len = 1;
+
+ sg_init_one(&sg, data_buf, 8);
+
+ mmc_set_data_timeout(&data, card);
+
+ mmc_wait_for_req(card->host, &mrq);
+
+ memcpy(scr, data_buf, sizeof(card->raw_scr));
+ kfree(data_buf);
+
+ if (cmd.error)
+ return cmd.error;
+ if (data.error)
+ return data.error;
+
+ scr[0] = be32_to_cpu(scr[0]);
+ scr[1] = be32_to_cpu(scr[1]);
+
+ return 0;
+}
+
+int mmc_sd_switch(struct mmc_card *card, int mode, int group,
+ u8 value, u8 *resp)
+{
+ struct mmc_request mrq = {NULL};
+ struct mmc_command cmd = {0};
+ struct mmc_data data = {0};
+ struct scatterlist sg;
+
+ BUG_ON(!card);
+ BUG_ON(!card->host);
+
+ /* NOTE: caller guarantees resp is heap-allocated */
+
+ mode = !!mode;
+ value &= 0xF;
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ cmd.opcode = SD_SWITCH;
+ cmd.arg = mode << 31 | 0x00FFFFFF;
+ cmd.arg &= ~(0xF << (group * 4));
+ cmd.arg |= value << (group * 4);
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ data.blksz = 64;
+ data.blocks = 1;
+ data.flags = MMC_DATA_READ;
+ data.sg = &sg;
+ data.sg_len = 1;
+
+ sg_init_one(&sg, resp, 64);
+
+ mmc_set_data_timeout(&data, card);
+
+ mmc_wait_for_req(card->host, &mrq);
+
+ if (cmd.error)
+ return cmd.error;
+ if (data.error)
+ return data.error;
+
+ return 0;
+}
+
+int mmc_app_sd_status(struct mmc_card *card, void *ssr)
+{
+ int err;
+ struct mmc_request mrq = {NULL};
+ struct mmc_command cmd = {0};
+ struct mmc_data data = {0};
+ struct scatterlist sg;
+
+ BUG_ON(!card);
+ BUG_ON(!card->host);
+ BUG_ON(!ssr);
+
+ /* NOTE: caller guarantees ssr is heap-allocated */
+
+ err = mmc_app_cmd(card->host, card);
+ if (err)
+ return err;
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ cmd.opcode = SD_APP_SD_STATUS;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ data.blksz = 64;
+ data.blocks = 1;
+ data.flags = MMC_DATA_READ;
+ data.sg = &sg;
+ data.sg_len = 1;
+
+ sg_init_one(&sg, ssr, 64);
+
+ mmc_set_data_timeout(&data, card);
+
+ mmc_wait_for_req(card->host, &mrq);
+
+ if (cmd.error)
+ return cmd.error;
+ if (data.error)
+ return data.error;
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff