1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <errno.h>
10 #include <fdtdec.h>
11 #include <mmc.h>
12 #include <asm/test.h>
13
14 struct sandbox_mmc_plat {
15 struct mmc_config cfg;
16 struct mmc mmc;
17 };
18
19 /**
20 * sandbox_mmc_send_cmd() - Emulate SD commands
21 *
22 * This emulate an SD card version 2. Single-block reads result in zero data.
23 * Multiple-block reads return a test string.
24 */
sandbox_mmc_send_cmd(struct udevice * dev,struct mmc_cmd * cmd,struct mmc_data * data)25 static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
26 struct mmc_data *data)
27 {
28 switch (cmd->cmdidx) {
29 case MMC_CMD_ALL_SEND_CID:
30 break;
31 case SD_CMD_SEND_RELATIVE_ADDR:
32 cmd->response[0] = 0 << 16; /* mmc->rca */
33 case MMC_CMD_GO_IDLE_STATE:
34 break;
35 case SD_CMD_SEND_IF_COND:
36 cmd->response[0] = 0xaa;
37 break;
38 case MMC_CMD_SEND_STATUS:
39 cmd->response[0] = MMC_STATUS_RDY_FOR_DATA;
40 break;
41 case MMC_CMD_SELECT_CARD:
42 break;
43 case MMC_CMD_SEND_CSD:
44 cmd->response[0] = 0;
45 cmd->response[1] = 10 << 16; /* 1 << block_len */
46 break;
47 case SD_CMD_SWITCH_FUNC: {
48 if (!data)
49 break;
50 u32 *resp = (u32 *)data->dest;
51 resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY);
52 if ((cmd->cmdarg & 0xF) == UHS_SDR12_BUS_SPEED)
53 resp[4] = (cmd->cmdarg & 0xF) << 24;
54 break;
55 }
56 case MMC_CMD_READ_SINGLE_BLOCK:
57 memset(data->dest, '\0', data->blocksize);
58 break;
59 case MMC_CMD_READ_MULTIPLE_BLOCK:
60 strcpy(data->dest, "this is a test");
61 break;
62 case MMC_CMD_STOP_TRANSMISSION:
63 break;
64 case SD_CMD_APP_SEND_OP_COND:
65 cmd->response[0] = OCR_BUSY | OCR_HCS;
66 cmd->response[1] = 0;
67 cmd->response[2] = 0;
68 break;
69 case MMC_CMD_APP_CMD:
70 break;
71 case MMC_CMD_SET_BLOCKLEN:
72 debug("block len %d\n", cmd->cmdarg);
73 break;
74 case SD_CMD_APP_SEND_SCR: {
75 u32 *scr = (u32 *)data->dest;
76
77 scr[0] = cpu_to_be32(2 << 24 | 1 << 15); /* SD version 3 */
78 break;
79 }
80 default:
81 debug("%s: Unknown command %d\n", __func__, cmd->cmdidx);
82 break;
83 }
84
85 return 0;
86 }
87
sandbox_mmc_set_ios(struct udevice * dev)88 static int sandbox_mmc_set_ios(struct udevice *dev)
89 {
90 return 0;
91 }
92
sandbox_mmc_get_cd(struct udevice * dev)93 static int sandbox_mmc_get_cd(struct udevice *dev)
94 {
95 return 1;
96 }
97
98 static const struct dm_mmc_ops sandbox_mmc_ops = {
99 .send_cmd = sandbox_mmc_send_cmd,
100 .set_ios = sandbox_mmc_set_ios,
101 .get_cd = sandbox_mmc_get_cd,
102 };
103
sandbox_mmc_probe(struct udevice * dev)104 int sandbox_mmc_probe(struct udevice *dev)
105 {
106 struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
107
108 return mmc_init(&plat->mmc);
109 }
110
sandbox_mmc_bind(struct udevice * dev)111 int sandbox_mmc_bind(struct udevice *dev)
112 {
113 struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
114 struct mmc_config *cfg = &plat->cfg;
115
116 cfg->name = dev->name;
117 cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_8BIT;
118 cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34;
119 cfg->f_min = 1000000;
120 cfg->f_max = 52000000;
121 cfg->b_max = U32_MAX;
122
123 return mmc_bind(dev, &plat->mmc, cfg);
124 }
125
sandbox_mmc_unbind(struct udevice * dev)126 int sandbox_mmc_unbind(struct udevice *dev)
127 {
128 mmc_unbind(dev);
129
130 return 0;
131 }
132
133 static const struct udevice_id sandbox_mmc_ids[] = {
134 { .compatible = "sandbox,mmc" },
135 { }
136 };
137
138 U_BOOT_DRIVER(mmc_sandbox) = {
139 .name = "mmc_sandbox",
140 .id = UCLASS_MMC,
141 .of_match = sandbox_mmc_ids,
142 .ops = &sandbox_mmc_ops,
143 .bind = sandbox_mmc_bind,
144 .unbind = sandbox_mmc_unbind,
145 .probe = sandbox_mmc_probe,
146 .platdata_auto_alloc_size = sizeof(struct sandbox_mmc_plat),
147 };
148