1 /* 2 * Copyright (c) 2015 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <dm.h> 10 #include <errno.h> 11 #include <fdtdec.h> 12 #include <mmc.h> 13 #include <asm/test.h> 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 struct sandbox_mmc_plat { 18 struct mmc_config cfg; 19 struct mmc mmc; 20 }; 21 22 /** 23 * sandbox_mmc_send_cmd() - Emulate SD commands 24 * 25 * This emulate an SD card version 2. Single-block reads result in zero data. 26 * Multiple-block reads return a test string. 27 */ 28 static int sandbox_mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, 29 struct mmc_data *data) 30 { 31 switch (cmd->cmdidx) { 32 case MMC_CMD_ALL_SEND_CID: 33 break; 34 case SD_CMD_SEND_RELATIVE_ADDR: 35 cmd->response[0] = 0 << 16; /* mmc->rca */ 36 case MMC_CMD_GO_IDLE_STATE: 37 break; 38 case SD_CMD_SEND_IF_COND: 39 cmd->response[0] = 0xaa; 40 break; 41 case MMC_CMD_SEND_STATUS: 42 cmd->response[0] = MMC_STATUS_RDY_FOR_DATA; 43 break; 44 case MMC_CMD_SELECT_CARD: 45 break; 46 case MMC_CMD_SEND_CSD: 47 cmd->response[0] = 0; 48 cmd->response[1] = 10 << 16; /* 1 << block_len */ 49 break; 50 case SD_CMD_SWITCH_FUNC: { 51 u32 *resp = (u32 *)data->dest; 52 53 resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY); 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 88 static void sandbox_mmc_set_ios(struct mmc *mmc) 89 { 90 } 91 92 static int sandbox_mmc_init(struct mmc *mmc) 93 { 94 return 0; 95 } 96 97 static int sandbox_mmc_getcd(struct mmc *mmc) 98 { 99 return 1; 100 } 101 102 static const struct mmc_ops sandbox_mmc_ops = { 103 .send_cmd = sandbox_mmc_send_cmd, 104 .set_ios = sandbox_mmc_set_ios, 105 .init = sandbox_mmc_init, 106 .getcd = sandbox_mmc_getcd, 107 }; 108 109 int sandbox_mmc_probe(struct udevice *dev) 110 { 111 struct sandbox_mmc_plat *plat = dev_get_platdata(dev); 112 113 return mmc_init(&plat->mmc); 114 } 115 116 int sandbox_mmc_bind(struct udevice *dev) 117 { 118 struct sandbox_mmc_plat *plat = dev_get_platdata(dev); 119 struct mmc_config *cfg = &plat->cfg; 120 int ret; 121 122 cfg->name = dev->name; 123 cfg->ops = &sandbox_mmc_ops; 124 cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_8BIT; 125 cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34; 126 cfg->f_min = 1000000; 127 cfg->f_max = 52000000; 128 cfg->b_max = U32_MAX; 129 130 ret = mmc_bind(dev, &plat->mmc, cfg); 131 if (ret) 132 return ret; 133 134 return 0; 135 } 136 137 int sandbox_mmc_unbind(struct udevice *dev) 138 { 139 mmc_unbind(dev); 140 141 return 0; 142 } 143 144 static const struct udevice_id sandbox_mmc_ids[] = { 145 { .compatible = "sandbox,mmc" }, 146 { } 147 }; 148 149 U_BOOT_DRIVER(mmc_sandbox) = { 150 .name = "mmc_sandbox", 151 .id = UCLASS_MMC, 152 .of_match = sandbox_mmc_ids, 153 .bind = sandbox_mmc_bind, 154 .unbind = sandbox_mmc_unbind, 155 .probe = sandbox_mmc_probe, 156 .platdata_auto_alloc_size = sizeof(struct sandbox_mmc_plat), 157 }; 158