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 struct sandbox_mmc_plat { 16 struct mmc_config cfg; 17 struct mmc mmc; 18 }; 19 20 /** 21 * sandbox_mmc_send_cmd() - Emulate SD commands 22 * 23 * This emulate an SD card version 2. Single-block reads result in zero data. 24 * Multiple-block reads return a test string. 25 */ 26 static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, 27 struct mmc_data *data) 28 { 29 switch (cmd->cmdidx) { 30 case MMC_CMD_ALL_SEND_CID: 31 break; 32 case SD_CMD_SEND_RELATIVE_ADDR: 33 cmd->response[0] = 0 << 16; /* mmc->rca */ 34 case MMC_CMD_GO_IDLE_STATE: 35 break; 36 case SD_CMD_SEND_IF_COND: 37 cmd->response[0] = 0xaa; 38 break; 39 case MMC_CMD_SEND_STATUS: 40 cmd->response[0] = MMC_STATUS_RDY_FOR_DATA; 41 break; 42 case MMC_CMD_SELECT_CARD: 43 break; 44 case MMC_CMD_SEND_CSD: 45 cmd->response[0] = 0; 46 cmd->response[1] = 10 << 16; /* 1 << block_len */ 47 break; 48 case SD_CMD_SWITCH_FUNC: { 49 if (!data) 50 break; 51 u32 *resp = (u32 *)data->dest; 52 resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY); 53 if ((cmd->cmdarg & 0xF) == UHS_SDR12_BUS_SPEED) 54 resp[4] = (cmd->cmdarg & 0xF) << 24; 55 break; 56 } 57 case MMC_CMD_READ_SINGLE_BLOCK: 58 memset(data->dest, '\0', data->blocksize); 59 break; 60 case MMC_CMD_READ_MULTIPLE_BLOCK: 61 strcpy(data->dest, "this is a test"); 62 break; 63 case MMC_CMD_STOP_TRANSMISSION: 64 break; 65 case SD_CMD_APP_SEND_OP_COND: 66 cmd->response[0] = OCR_BUSY | OCR_HCS; 67 cmd->response[1] = 0; 68 cmd->response[2] = 0; 69 break; 70 case MMC_CMD_APP_CMD: 71 break; 72 case MMC_CMD_SET_BLOCKLEN: 73 debug("block len %d\n", cmd->cmdarg); 74 break; 75 case SD_CMD_APP_SEND_SCR: { 76 u32 *scr = (u32 *)data->dest; 77 78 scr[0] = cpu_to_be32(2 << 24 | 1 << 15); /* SD version 3 */ 79 break; 80 } 81 default: 82 debug("%s: Unknown command %d\n", __func__, cmd->cmdidx); 83 break; 84 } 85 86 return 0; 87 } 88 89 static int sandbox_mmc_set_ios(struct udevice *dev) 90 { 91 return 0; 92 } 93 94 static int sandbox_mmc_get_cd(struct udevice *dev) 95 { 96 return 1; 97 } 98 99 static const struct dm_mmc_ops sandbox_mmc_ops = { 100 .send_cmd = sandbox_mmc_send_cmd, 101 .set_ios = sandbox_mmc_set_ios, 102 .get_cd = sandbox_mmc_get_cd, 103 }; 104 105 int sandbox_mmc_probe(struct udevice *dev) 106 { 107 struct sandbox_mmc_plat *plat = dev_get_platdata(dev); 108 109 return mmc_init(&plat->mmc); 110 } 111 112 int sandbox_mmc_bind(struct udevice *dev) 113 { 114 struct sandbox_mmc_plat *plat = dev_get_platdata(dev); 115 struct mmc_config *cfg = &plat->cfg; 116 117 cfg->name = dev->name; 118 cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_8BIT; 119 cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34; 120 cfg->f_min = 1000000; 121 cfg->f_max = 52000000; 122 cfg->b_max = U32_MAX; 123 124 return mmc_bind(dev, &plat->mmc, cfg); 125 } 126 127 int sandbox_mmc_unbind(struct udevice *dev) 128 { 129 mmc_unbind(dev); 130 131 return 0; 132 } 133 134 static const struct udevice_id sandbox_mmc_ids[] = { 135 { .compatible = "sandbox,mmc" }, 136 { } 137 }; 138 139 U_BOOT_DRIVER(mmc_sandbox) = { 140 .name = "mmc_sandbox", 141 .id = UCLASS_MMC, 142 .of_match = sandbox_mmc_ids, 143 .ops = &sandbox_mmc_ops, 144 .bind = sandbox_mmc_bind, 145 .unbind = sandbox_mmc_unbind, 146 .probe = sandbox_mmc_probe, 147 .platdata_auto_alloc_size = sizeof(struct sandbox_mmc_plat), 148 }; 149