[U-Boot] [PATCH 2/2] ARM: rpi_b: enable SD controller, add related env/cmds
Stephen Warren
swarren at wwwdotorg.org
Wed Oct 24 06:50:48 CEST 2012
Enable the SD controller driver for the Raspberry Pi. Enable a number
of useful MMC, partition, and filesystem-related commands. Set up the
environment to provide standard locations for loading a kernel, DTB,
etc. Provide a boot command that loads and executes boot.scr.uimg from
the SD card; this is written considering future extensibilty to USB
storage.
Signed-off-by: Stephen Warren <swarren at wwwdotorg.org>
---
arch/arm/include/asm/arch-bcm2835/mbox.h | 26 ++++++++++++
board/raspberrypi/rpi_b/rpi_b.c | 26 ++++++++++++
include/configs/rpi_b.h | 68 ++++++++++++++++++++++++++++--
3 files changed, 117 insertions(+), 3 deletions(-)
diff --git a/arch/arm/include/asm/arch-bcm2835/mbox.h b/arch/arm/include/asm/arch-bcm2835/mbox.h
index 6e040c5..5a9bd87 100644
--- a/arch/arm/include/asm/arch-bcm2835/mbox.h
+++ b/arch/arm/include/asm/arch-bcm2835/mbox.h
@@ -143,6 +143,32 @@ struct bcm2835_mbox_tag_get_arm_mem {
} body;
};
+#define BCM2835_MBOX_TAG_GET_CLOCK_RATE 0x00030002
+
+#define BCM2835_MBOX_CLOCK_ID_EMMC 1
+#define BCM2835_MBOX_CLOCK_ID_UART 2
+#define BCM2835_MBOX_CLOCK_ID_ARM 3
+#define BCM2835_MBOX_CLOCK_ID_CORE 4
+#define BCM2835_MBOX_CLOCK_ID_V3D 5
+#define BCM2835_MBOX_CLOCK_ID_H264 6
+#define BCM2835_MBOX_CLOCK_ID_ISP 7
+#define BCM2835_MBOX_CLOCK_ID_SDRAM 8
+#define BCM2835_MBOX_CLOCK_ID_PIXEL 9
+#define BCM2835_MBOX_CLOCK_ID_PWM 10
+
+struct bcm2835_mbox_tag_get_clock_rate {
+ struct bcm2835_mbox_tag_hdr tag_hdr;
+ union {
+ struct {
+ u32 clock_id;
+ } req;
+ struct {
+ u32 clock_id;
+ u32 rate_hz;
+ } resp;
+ } body;
+};
+
#define BCM2835_MBOX_TAG_ALLOCATE_BUFFER 0x00040001
struct bcm2835_mbox_tag_allocate_buffer {
diff --git a/board/raspberrypi/rpi_b/rpi_b.c b/board/raspberrypi/rpi_b/rpi_b.c
index 3c654a1..6b3e095 100644
--- a/board/raspberrypi/rpi_b/rpi_b.c
+++ b/board/raspberrypi/rpi_b/rpi_b.c
@@ -16,6 +16,7 @@
#include <common.h>
#include <asm/arch/mbox.h>
+#include <asm/arch/sdhci.h>
#include <asm/global_data.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -26,6 +27,12 @@ struct msg_get_arm_mem {
u32 end_tag;
};
+struct msg_get_clock_rate {
+ struct bcm2835_mbox_hdr hdr;
+ struct bcm2835_mbox_tag_get_clock_rate get_clock_rate;
+ u32 end_tag;
+};
+
int dram_init(void)
{
ALLOC_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1, 16);
@@ -51,3 +58,22 @@ int board_init(void)
return 0;
}
+
+int board_mmc_init(void)
+{
+ ALLOC_ALIGN_BUFFER(struct msg_get_clock_rate, msg_clk, 1, 16);
+ int ret;
+
+ BCM2835_MBOX_INIT_HDR(msg_clk);
+ BCM2835_MBOX_INIT_TAG(&msg_clk->get_clock_rate, GET_CLOCK_RATE);
+ msg_clk->get_clock_rate.body.req.clock_id = BCM2835_MBOX_CLOCK_ID_EMMC;
+
+ ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_clk->hdr);
+ if (ret) {
+ printf("bcm2835: Could not query eMMC clock rate\n");
+ return -1;
+ }
+
+ return bcm2835_sdhci_init(BCM2835_SDHCI_BASE,
+ msg_clk->get_clock_rate.body.resp.rate_hz);
+}
diff --git a/include/configs/rpi_b.h b/include/configs/rpi_b.h
index a709feb..4d834e1 100644
--- a/include/configs/rpi_b.h
+++ b/include/configs/rpi_b.h
@@ -50,6 +50,7 @@
#define CONFIG_SYS_MALLOC_LEN SZ_4M
#define CONFIG_SYS_MEMTEST_START 0x00100000
#define CONFIG_SYS_MEMTEST_END 0x00200000
+#define CONFIG_LOADADDR 0x00200000
/* Flash */
#define CONFIG_SYS_NO_FLASH
@@ -69,6 +70,13 @@
#define CONFIG_VIDEO_BCM2835
#define CONFIG_SYS_WHITE_ON_BLACK
+/* SD/MMC configuration */
+#define CONFIG_GENERIC_MMC
+#define CONFIG_MMC
+#define CONFIG_SDHCI
+#define CONFIG_MMC_SDHCI_IO_ACCESSORS
+#define CONFIG_BCM2835_SDHCI
+
/* Console UART */
#define CONFIG_PL011_SERIAL
#define CONFIG_PL011_CLOCK 3000000
@@ -84,12 +92,59 @@
/* Environment */
#define CONFIG_ENV_SIZE SZ_16K
#define CONFIG_ENV_IS_NOWHERE
+#define CONFIG_ENV_VARS_UBOOT_CONFIG
#define CONFIG_SYS_LOAD_ADDR 0x1000000
#define CONFIG_CONSOLE_MUX
#define CONFIG_SYS_CONSOLE_IS_IN_ENV
-#define CONFIG_EXTRA_ENV_SETTINGS "stdin=serial\0" \
- "stderr=serial,lcd\0" \
- "stdout=serial,lcd\0"
+/*
+ * Memory layout for where various images get loaded by boot scripts:
+ *
+ * scriptaddr can be pretty much anywhere that doesn't conflict with something
+ * else. Put it low in memory to avoid conflicts.
+ *
+ * kernel_addr_r must be within the first 128M of RAM in order for the
+ * kernel's CONFIG_AUTO_ZRELADDR option to work. Since the kernel will
+ * decompress itself to 0x8000 after the start of RAM, kernel_addr_r
+ * should not overlap that area, or the kernel will have to copy itself
+ * somewhere else before decompression. Similarly, the address of any other
+ * data passed to the kernel shouldn't overlap the start of RAM. Pushing
+ * this up to 16M allows for a sizable kernel to be decompressed below the
+ * compressed load address.
+ *
+ * fdt_addr_r simply shouldn't overlap anything else. Choosing 32M allows for
+ * the compressed kernel to be up to 16M too.
+ *
+ * ramdisk_addr_r simply shouldn't overlap anything else. Choosing 33M allows
+ * for the FDT/DTB to be up to 1M, which is hopefully plenty.
+ */
+#define CONFIG_EXTRA_ENV_SETTINGS \
+ "stdin=serial\0" \
+ "stderr=serial,lcd\0" \
+ "stdout=serial,lcd\0" \
+ "scriptaddr=0x00000000\0" \
+ "kernel_addr_r=0x01000000\0" \
+ "fdt_addr_r=0x02000000\0" \
+ "ramdisk_addr_r=0x02100000\0" \
+ "boot_targets=mmc0\0" \
+ \
+ "script_boot=" \
+ "if fatload ${devtype} ${devnum}:1 " \
+ "${scriptaddr} boot.scr.uimg; then " \
+ "source ${scriptaddr}; " \
+ "fi;\0" \
+ \
+ "mmc_boot=" \
+ "setenv devtype mmc; " \
+ "if mmc dev ${devnum}; then " \
+ "run script_boot; " \
+ "fi\0" \
+ \
+ "bootcmd_mmc0=setenv devnum 0; run mmc_boot\0" \
+
+#define CONFIG_BOOTCOMMAND \
+ "for target in ${boot_targets}; do run bootcmd_${target}; done"
+
+#define CONFIG_BOOTDELAY 2
/* Shell */
#define CONFIG_SYS_HUSH_PARSER
@@ -104,6 +159,13 @@
#include <config_cmd_default.h>
#define CONFIG_CMD_BOOTZ
#define CONFIG_CMD_GPIO
+#define CONFIG_CMD_MMC
+#define CONFIG_DOS_PARTITION
+#define CONFIG_PARTITION_UUIDS
+#define CONFIG_CMD_PART
+#define CONFIG_CMD_FS_GENERIC
+#define CONFIG_CMD_FAT
+#define CONFIG_CMD_EXT
/* Some things don't make sense on this HW or yet */
#undef CONFIG_CMD_FPGA
#undef CONFIG_CMD_NET
--
1.7.9.5
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