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
do_mmc_spi(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])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