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https://github.com/AsahiLinux/u-boot
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d52ebf1022
This patch supports mmc/sd card with spi interface. It is based on the generic mmc framework. It works with SDHC and supports multi blocks read/write. The crc checksum on data packet is enabled with the def, There is a subcomamnd "mmc_spi" to setup spi bus and cs at run time. Signed-off-by: Thomas Chou <thomas@wytron.com.tw> Signed-off-by: Andy Fleming <afleming@freescale.com>
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
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* Command for mmc_spi setup.
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*
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* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <mmc.h>
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#include <spi.h>
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#ifndef CONFIG_MMC_SPI_BUS
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# define CONFIG_MMC_SPI_BUS 0
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#endif
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#ifndef CONFIG_MMC_SPI_CS
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# define CONFIG_MMC_SPI_CS 1
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#endif
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/* in SPI mode, MMC speed limit is 20MHz, while SD speed limit is 25MHz */
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#ifndef CONFIG_MMC_SPI_SPEED
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# define CONFIG_MMC_SPI_SPEED 25000000
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#endif
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/* MMC and SD specs only seem to care that sampling is on the
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* rising edge ... meaning SPI modes 0 or 3. So either SPI mode
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* should be legit. We'll use mode 0 since the steady state is 0,
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* which is appropriate for hotplugging, unless the platform data
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* specify mode 3 (if hardware is not compatible to mode 0).
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*/
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#ifndef CONFIG_MMC_SPI_MODE
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# define CONFIG_MMC_SPI_MODE SPI_MODE_0
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#endif
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static int do_mmc_spi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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uint bus = CONFIG_MMC_SPI_BUS;
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uint cs = CONFIG_MMC_SPI_CS;
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uint speed = CONFIG_MMC_SPI_SPEED;
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uint mode = CONFIG_MMC_SPI_MODE;
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char *endp;
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struct mmc *mmc;
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if (argc < 2)
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goto usage;
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cs = simple_strtoul(argv[1], &endp, 0);
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if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
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goto usage;
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if (*endp == ':') {
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if (endp[1] == 0)
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goto usage;
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bus = cs;
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cs = simple_strtoul(endp + 1, &endp, 0);
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if (*endp != 0)
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goto usage;
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}
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if (argc >= 3) {
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speed = simple_strtoul(argv[2], &endp, 0);
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if (*argv[2] == 0 || *endp != 0)
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goto usage;
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}
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if (argc >= 4) {
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mode = simple_strtoul(argv[3], &endp, 16);
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if (*argv[3] == 0 || *endp != 0)
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goto usage;
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}
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if (!spi_cs_is_valid(bus, cs)) {
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printf("Invalid SPI bus %u cs %u\n", bus, cs);
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return 1;
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}
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mmc = mmc_spi_init(bus, cs, speed, mode);
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if (!mmc) {
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printf("Failed to create MMC Device\n");
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return 1;
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}
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printf("%s: %d at %u:%u hz %u mode %u\n", mmc->name, mmc->block_dev.dev,
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bus, cs, speed, mode);
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return 0;
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usage:
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cmd_usage(cmdtp);
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return 1;
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}
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U_BOOT_CMD(
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mmc_spi, 4, 0, do_mmc_spi,
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"mmc_spi setup",
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"[bus:]cs [hz] [mode] - setup mmc_spi device"
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);
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