mmc: sandbox: Add support for writing

This adds support writing to the sandbox mmc backed by an in-memory
buffer. The unit test has been updated to test reading, writing, and
erasing. I'm not sure what MMCs erase to; I picked 0, but if it's 0xFF
then that can be easily changed.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/mmc/sandbox_mmc.c b/drivers/mmc/sandbox_mmc.c
index 8a2391d..18ba020 100644 (file)
--- a/drivers/mmc/sandbox_mmc.c
+++ b/drivers/mmc/sandbox_mmc.c
@@ -17,6 +17,17 @@ struct sandbox_mmc_plat {
        struct mmc mmc;
 };
 
+#define MMC_CSIZE 0
+#define MMC_CMULT 8 /* 8 because the card is high-capacity */
+#define MMC_BL_LEN_SHIFT 10
+#define MMC_BL_LEN BIT(MMC_BL_LEN_SHIFT)
+#define MMC_CAPACITY (((MMC_CSIZE + 1) << (MMC_CMULT + 2)) \
+                     * MMC_BL_LEN) /* 1 MiB */
+
+struct sandbox_mmc_priv {
+       u8 buf[MMC_CAPACITY];
+};
+
 /**
  * sandbox_mmc_send_cmd() - Emulate SD commands
  *
@@ -26,6 +37,10 @@ struct sandbox_mmc_plat {
 static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
                                struct mmc_data *data)
 {
+       struct sandbox_mmc_priv *priv = dev_get_priv(dev);
+       struct mmc *mmc = mmc_get_mmc_dev(dev);
+       static ulong erase_start, erase_end;
+
        switch (cmd->cmdidx) {
        case MMC_CMD_ALL_SEND_CID:
                memset(cmd->response, '\0', sizeof(cmd->response));
@@ -44,8 +59,9 @@ static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
                break;
        case MMC_CMD_SEND_CSD:
                cmd->response[0] = 0;
-               cmd->response[1] = 10 << 16;    /* 1 << block_len */
-               cmd->response[2] = 0;
+               cmd->response[1] = (MMC_BL_LEN_SHIFT << 16) |
+                                  ((MMC_CSIZE >> 16) & 0x3f);
+               cmd->response[2] = (MMC_CSIZE & 0xffff) << 16;
                cmd->response[3] = 0;
                break;
        case SD_CMD_SWITCH_FUNC: {
@@ -59,13 +75,27 @@ static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
                break;
        }
        case MMC_CMD_READ_SINGLE_BLOCK:
-               memset(data->dest, '\0', data->blocksize);
-               break;
        case MMC_CMD_READ_MULTIPLE_BLOCK:
-               strcpy(data->dest, "this is a test");
+               memcpy(data->dest, &priv->buf[cmd->cmdarg * data->blocksize],
+                      data->blocks * data->blocksize);
+               break;
+       case MMC_CMD_WRITE_SINGLE_BLOCK:
+       case MMC_CMD_WRITE_MULTIPLE_BLOCK:
+               memcpy(&priv->buf[cmd->cmdarg * data->blocksize], data->src,
+                      data->blocks * data->blocksize);
                break;
        case MMC_CMD_STOP_TRANSMISSION:
                break;
+       case SD_CMD_ERASE_WR_BLK_START:
+               erase_start = cmd->cmdarg;
+               break;
+       case SD_CMD_ERASE_WR_BLK_END:
+               erase_end = cmd->cmdarg;
+               break;
+       case MMC_CMD_ERASE:
+               memset(&priv->buf[erase_start * mmc->write_bl_len], '\0',
+                      (erase_end - erase_start + 1) * mmc->write_bl_len);
+               break;
        case SD_CMD_APP_SEND_OP_COND:
                cmd->response[0] = OCR_BUSY | OCR_HCS;
                cmd->response[1] = 0;
@@ -148,5 +178,6 @@ U_BOOT_DRIVER(mmc_sandbox) = {
        .bind           = sandbox_mmc_bind,
        .unbind         = sandbox_mmc_unbind,
        .probe          = sandbox_mmc_probe,
-       .plat_auto      = sizeof(struct sandbox_mmc_plat),
+       .priv_auto = sizeof(struct sandbox_mmc_priv),
+       .plat_auto = sizeof(struct sandbox_mmc_plat),
 };

diff --git a/test/dm/mmc.c b/test/dm/mmc.c
index 4e5136c..f744452 100644 (file)
--- a/test/dm/mmc.c
+++ b/test/dm/mmc.c
@@ -29,16 +29,25 @@ static int dm_test_mmc_blk(struct unit_test_state *uts)
 {
        struct udevice *dev;
        struct blk_desc *dev_desc;
-       char cmp[1024];
+       int i;
+       char write[1024], read[1024];
 
        ut_assertok(uclass_get_device(UCLASS_MMC, 0, &dev));
        ut_assertok(blk_get_device_by_str("mmc", "0", &dev_desc));
 
-       /* Read a few blocks and look for the string we expect */
+       /* Write a few blocks and verify that we get the same data back */
        ut_asserteq(512, dev_desc->blksz);
-       memset(cmp, '\0', sizeof(cmp));
-       ut_asserteq(2, blk_dread(dev_desc, 0, 2, cmp));
-       ut_assertok(strcmp(cmp, "this is a test"));
+       for (i = 0; i < sizeof(write); i++)
+               write[i] = i;
+       ut_asserteq(2, blk_dwrite(dev_desc, 0, 2, write));
+       ut_asserteq(2, blk_dread(dev_desc, 0, 2, read));
+       ut_asserteq_mem(write, read, sizeof(write));
+
+       /* Now erase them */
+       memset(write, '\0', sizeof(write));
+       ut_asserteq(2, blk_derase(dev_desc, 0, 2));
+       ut_asserteq(2, blk_dread(dev_desc, 0, 2, read));
+       ut_asserteq_mem(write, read, sizeof(write));
 
        return 0;
 }