blob: cfd0fb11367625dbd21f4fcc395795289cdcba2b [file] [log] [blame]
Thomas Choud52ebf12010-12-24 13:12:21 +00001/*
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
32static 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->name, mmc->block_dev.dev,
76 bus, cs, speed, mode);
Thomas Chou28df15e2011-04-17 21:00:46 +000077 mmc_init(mmc);
Thomas Choud52ebf12010-12-24 13:12:21 +000078 return 0;
79
80usage:
81 cmd_usage(cmdtp);
82 return 1;
83}
84
85U_BOOT_CMD(
86 mmc_spi, 4, 0, do_mmc_spi,
87 "mmc_spi setup",
88 "[bus:]cs [hz] [mode] - setup mmc_spi device"
89);