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 udevice *dev, 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 if (!data) 52 break; 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; 57 break; 58 } 59 case MMC_CMD_READ_SINGLE_BLOCK: 60 memset(data->dest, '\0', data->blocksize); 61 break; 62 case MMC_CMD_READ_MULTIPLE_BLOCK: 63 strcpy(data->dest, "this is a test"); 64 break; 65 case MMC_CMD_STOP_TRANSMISSION: 66 break; 67 case SD_CMD_APP_SEND_OP_COND: 68 cmd->response[0] = OCR_BUSY | OCR_HCS; 69 cmd->response[1] = 0; 70 cmd->response[2] = 0; 71 break; 72 case MMC_CMD_APP_CMD: 73 break; 74 case MMC_CMD_SET_BLOCKLEN: 75 debug("block len %d\n", cmd->cmdarg); 76 break; 77 case SD_CMD_APP_SEND_SCR: { 78 u32 *scr = (u32 *)data->dest; 79 80 scr[0] = cpu_to_be32(2 << 24 | 1 << 15); /* SD version 3 */ 81 break; 82 } 83 default: 84 debug("%s: Unknown command %d\n", __func__, cmd->cmdidx); 85 break; 86 } 87 88 return 0; 89 } 90 91 static int sandbox_mmc_set_ios(struct udevice *dev) 92 { 93 return 0; 94 } 95 96 static int sandbox_mmc_get_cd(struct udevice *dev) 97 { 98 return 1; 99 } 100 101 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, 105 }; 106 107 int sandbox_mmc_probe(struct udevice *dev) 108 { 109 struct sandbox_mmc_plat *plat = dev_get_platdata(dev); 110 111 return mmc_init(&plat->mmc); 112 } 113 114 int sandbox_mmc_bind(struct udevice *dev) 115 { 116 struct sandbox_mmc_plat *plat = dev_get_platdata(dev); 117 struct mmc_config *cfg = &plat->cfg; 118 119 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; 125 126 return mmc_bind(dev, &plat->mmc, cfg); 127 } 128 129 int sandbox_mmc_unbind(struct udevice *dev) 130 { 131 mmc_unbind(dev); 132 133 return 0; 134 } 135 136 static const struct udevice_id sandbox_mmc_ids[] = { 137 { .compatible = "sandbox,mmc" }, 138 { } 139 }; 140 141 U_BOOT_DRIVER(mmc_sandbox) = { 142 .name = "mmc_sandbox", 143 .id = UCLASS_MMC, 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), 150 }; 151