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authorThomas Chou <thomas@wytron.com.tw>2010-12-24 13:12:21 +0000
committerAndy Fleming <afleming@freescale.com>2011-04-13 06:35:22 -0500
commitd52ebf102209cc1ad460c79b9498b2c8936ba413 (patch)
tree843fc83bf6b7d92f49177bc0c585a56b20662bb2 /common/cmd_mmc_spi.c
parent5f837c2c0ebda8f22474d26f85857993fb81ad7c (diff)
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mmc: add generic mmc spi driver
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>
Diffstat (limited to 'common/cmd_mmc_spi.c')
-rw-r--r--common/cmd_mmc_spi.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/common/cmd_mmc_spi.c b/common/cmd_mmc_spi.c
new file mode 100644
index 0000000..63fe313
--- /dev/null
+++ b/common/cmd_mmc_spi.c
@@ -0,0 +1,88 @@
+/*
+ * Command for mmc_spi setup.
+ *
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <mmc.h>
+#include <spi.h>
+
+#ifndef CONFIG_MMC_SPI_BUS
+# define CONFIG_MMC_SPI_BUS 0
+#endif
+#ifndef CONFIG_MMC_SPI_CS
+# define CONFIG_MMC_SPI_CS 1
+#endif
+/* in SPI mode, MMC speed limit is 20MHz, while SD speed limit is 25MHz */
+#ifndef CONFIG_MMC_SPI_SPEED
+# define CONFIG_MMC_SPI_SPEED 25000000
+#endif
+/* MMC and SD specs only seem to care that sampling is on the
+ * rising edge ... meaning SPI modes 0 or 3. So either SPI mode
+ * should be legit. We'll use mode 0 since the steady state is 0,
+ * which is appropriate for hotplugging, unless the platform data
+ * specify mode 3 (if hardware is not compatible to mode 0).
+ */
+#ifndef CONFIG_MMC_SPI_MODE
+# define CONFIG_MMC_SPI_MODE SPI_MODE_0
+#endif
+
+static int do_mmc_spi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ uint bus = CONFIG_MMC_SPI_BUS;
+ uint cs = CONFIG_MMC_SPI_CS;
+ uint speed = CONFIG_MMC_SPI_SPEED;
+ uint mode = CONFIG_MMC_SPI_MODE;
+ char *endp;
+ struct mmc *mmc;
+
+ if (argc < 2)
+ goto usage;
+
+ cs = simple_strtoul(argv[1], &endp, 0);
+ if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
+ goto usage;
+ if (*endp == ':') {
+ if (endp[1] == 0)
+ goto usage;
+ bus = cs;
+ cs = simple_strtoul(endp + 1, &endp, 0);
+ if (*endp != 0)
+ goto usage;
+ }
+ if (argc >= 3) {
+ speed = simple_strtoul(argv[2], &endp, 0);
+ if (*argv[2] == 0 || *endp != 0)
+ goto usage;
+ }
+ if (argc >= 4) {
+ mode = simple_strtoul(argv[3], &endp, 16);
+ if (*argv[3] == 0 || *endp != 0)
+ goto usage;
+ }
+ if (!spi_cs_is_valid(bus, cs)) {
+ printf("Invalid SPI bus %u cs %u\n", bus, cs);
+ return 1;
+ }
+
+ mmc = mmc_spi_init(bus, cs, speed, mode);
+ if (!mmc) {
+ printf("Failed to create MMC Device\n");
+ return 1;
+ }
+ printf("%s: %d at %u:%u hz %u mode %u\n", mmc->name, mmc->block_dev.dev,
+ bus, cs, speed, mode);
+ return 0;
+
+usage:
+ cmd_usage(cmdtp);
+ return 1;
+}
+
+U_BOOT_CMD(
+ mmc_spi, 4, 0, do_mmc_spi,
+ "mmc_spi setup",
+ "[bus:]cs [hz] [mode] - setup mmc_spi device"
+);