2 * Copyright (c) 2015 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
5 * SPDX-License-Identifier: GPL-2.0+
15 DECLARE_GLOBAL_DATA_PTR;
17 struct sandbox_mmc_plat {
18 struct mmc_config cfg;
23 * sandbox_mmc_send_cmd() - Emulate SD commands
25 * This emulate an SD card version 2. Single-block reads result in zero data.
26 * Multiple-block reads return a test string.
28 static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
29 struct mmc_data *data)
31 switch (cmd->cmdidx) {
32 case MMC_CMD_ALL_SEND_CID:
34 case SD_CMD_SEND_RELATIVE_ADDR:
35 cmd->response[0] = 0 << 16; /* mmc->rca */
36 case MMC_CMD_GO_IDLE_STATE:
38 case SD_CMD_SEND_IF_COND:
39 cmd->response[0] = 0xaa;
41 case MMC_CMD_SEND_STATUS:
42 cmd->response[0] = MMC_STATUS_RDY_FOR_DATA;
44 case MMC_CMD_SELECT_CARD:
46 case MMC_CMD_SEND_CSD:
48 cmd->response[1] = 10 << 16; /* 1 << block_len */
50 case SD_CMD_SWITCH_FUNC: {
53 u32 *resp = (u32 *)data->dest;
54 resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY);
55 if ((cmd->cmdarg & 0xF) == UHS_SDR12_BUS_SPEED)
56 resp[4] = (cmd->cmdarg & 0xF) << 24;
59 case MMC_CMD_READ_SINGLE_BLOCK:
60 memset(data->dest, '\0', data->blocksize);
62 case MMC_CMD_READ_MULTIPLE_BLOCK:
63 strcpy(data->dest, "this is a test");
65 case MMC_CMD_STOP_TRANSMISSION:
67 case SD_CMD_APP_SEND_OP_COND:
68 cmd->response[0] = OCR_BUSY | OCR_HCS;
74 case MMC_CMD_SET_BLOCKLEN:
75 debug("block len %d\n", cmd->cmdarg);
77 case SD_CMD_APP_SEND_SCR: {
78 u32 *scr = (u32 *)data->dest;
80 scr[0] = cpu_to_be32(2 << 24 | 1 << 15); /* SD version 3 */
84 debug("%s: Unknown command %d\n", __func__, cmd->cmdidx);
91 static int sandbox_mmc_set_ios(struct udevice *dev)
96 static int sandbox_mmc_get_cd(struct udevice *dev)
101 static const struct dm_mmc_ops sandbox_mmc_ops = {
102 .send_cmd = sandbox_mmc_send_cmd,
103 .set_ios = sandbox_mmc_set_ios,
104 .get_cd = sandbox_mmc_get_cd,
107 int sandbox_mmc_probe(struct udevice *dev)
109 struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
111 return mmc_init(&plat->mmc);
114 int sandbox_mmc_bind(struct udevice *dev)
116 struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
117 struct mmc_config *cfg = &plat->cfg;
119 cfg->name = dev->name;
120 cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_8BIT;
121 cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34;
122 cfg->f_min = 1000000;
123 cfg->f_max = 52000000;
124 cfg->b_max = U32_MAX;
126 return mmc_bind(dev, &plat->mmc, cfg);
129 int sandbox_mmc_unbind(struct udevice *dev)
136 static const struct udevice_id sandbox_mmc_ids[] = {
137 { .compatible = "sandbox,mmc" },
141 U_BOOT_DRIVER(mmc_sandbox) = {
142 .name = "mmc_sandbox",
144 .of_match = sandbox_mmc_ids,
145 .ops = &sandbox_mmc_ops,
146 .bind = sandbox_mmc_bind,
147 .unbind = sandbox_mmc_unbind,
148 .probe = sandbox_mmc_probe,
149 .platdata_auto_alloc_size = sizeof(struct sandbox_mmc_plat),