xref: /openbmc/u-boot/drivers/mmc/sandbox_mmc.c (revision e8f80a5a)
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