1 /* 2 * Command for mmc_spi setup. 3 * 4 * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> 5 * Licensed under the GPL-2 or later. 6 */ 7 8 #include <common.h> 9 #include <mmc.h> 10 #include <spi.h> 11 12 #ifndef CONFIG_MMC_SPI_BUS 13 # define CONFIG_MMC_SPI_BUS 0 14 #endif 15 #ifndef CONFIG_MMC_SPI_CS 16 # define CONFIG_MMC_SPI_CS 1 17 #endif 18 /* in SPI mode, MMC speed limit is 20MHz, while SD speed limit is 25MHz */ 19 #ifndef CONFIG_MMC_SPI_SPEED 20 # define CONFIG_MMC_SPI_SPEED 25000000 21 #endif 22 /* MMC and SD specs only seem to care that sampling is on the 23 * rising edge ... meaning SPI modes 0 or 3. So either SPI mode 24 * should be legit. We'll use mode 0 since the steady state is 0, 25 * which is appropriate for hotplugging, unless the platform data 26 * specify mode 3 (if hardware is not compatible to mode 0). 27 */ 28 #ifndef CONFIG_MMC_SPI_MODE 29 # define CONFIG_MMC_SPI_MODE SPI_MODE_0 30 #endif 31 32 static int do_mmc_spi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 33 { 34 uint bus = CONFIG_MMC_SPI_BUS; 35 uint cs = CONFIG_MMC_SPI_CS; 36 uint speed = CONFIG_MMC_SPI_SPEED; 37 uint mode = CONFIG_MMC_SPI_MODE; 38 char *endp; 39 struct mmc *mmc; 40 41 if (argc < 2) 42 goto usage; 43 44 cs = simple_strtoul(argv[1], &endp, 0); 45 if (*argv[1] == 0 || (*endp != 0 && *endp != ':')) 46 goto usage; 47 if (*endp == ':') { 48 if (endp[1] == 0) 49 goto usage; 50 bus = cs; 51 cs = simple_strtoul(endp + 1, &endp, 0); 52 if (*endp != 0) 53 goto usage; 54 } 55 if (argc >= 3) { 56 speed = simple_strtoul(argv[2], &endp, 0); 57 if (*argv[2] == 0 || *endp != 0) 58 goto usage; 59 } 60 if (argc >= 4) { 61 mode = simple_strtoul(argv[3], &endp, 16); 62 if (*argv[3] == 0 || *endp != 0) 63 goto usage; 64 } 65 if (!spi_cs_is_valid(bus, cs)) { 66 printf("Invalid SPI bus %u cs %u\n", bus, cs); 67 return 1; 68 } 69 70 mmc = mmc_spi_init(bus, cs, speed, mode); 71 if (!mmc) { 72 printf("Failed to create MMC Device\n"); 73 return 1; 74 } 75 printf("%s: %d at %u:%u hz %u mode %u\n", mmc->cfg->name, 76 mmc->block_dev.devnum, bus, cs, speed, mode); 77 mmc_init(mmc); 78 return 0; 79 80 usage: 81 return CMD_RET_USAGE; 82 } 83 84 U_BOOT_CMD( 85 mmc_spi, 4, 0, do_mmc_spi, 86 "mmc_spi setup", 87 "[bus:]cs [hz] [mode] - setup mmc_spi device" 88 ); 89