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author | Stephen Warren <swarren@wwwdotorg.org> | 2014-11-18 21:40:21 -0700 |
---|---|---|
committer | Tom Rini <trini@ti.com> | 2014-12-08 09:35:42 -0500 |
commit | 6fe7845a9823c12aa673ad3590059528c184b987 (patch) | |
tree | 0a7ae3d163810facecf4576530befac2f05b903d /board/raspberrypi/rpi_b | |
parent | 4c5bbc2328a24f5e1ee990c9a9527e48e5fb3b5f (diff) | |
download | u-boot-imx-6fe7845a9823c12aa673ad3590059528c184b987.zip u-boot-imx-6fe7845a9823c12aa673ad3590059528c184b987.tar.gz u-boot-imx-6fe7845a9823c12aa673ad3590059528c184b987.tar.bz2 |
ARM: rpi_b: detect board revision
Detect the board revision early during boot, and print the decoded
model name.
Eventually, this information can be used for tasks such as:
- Allowing/preventing USB device mode; some models have a USB device on-
board so only host mode makes sense. Others connect the SoC directly
to the USB connector, so device-mode might make sense.
- The on-board USB hub/Ethernet requires different GPIOs to enable it,
although luckily the default appears to be fine so far.
- The compute module contains an on-board eMMC device, so we could store
the environment there. Other models use an SD card and so don't support
saving the environment (unless we store it in a file on the FAT boot
partition...)
Set $fdtfile based on this information. At present, the mainline Linux
kernel doesn't contain a separate DTB for most models, but I hope that
will change soon.
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'board/raspberrypi/rpi_b')
-rw-r--r-- | board/raspberrypi/rpi_b/rpi_b.c | 122 |
1 files changed, 119 insertions, 3 deletions
diff --git a/board/raspberrypi/rpi_b/rpi_b.c b/board/raspberrypi/rpi_b/rpi_b.c index db904a4..51a4fa1 100644 --- a/board/raspberrypi/rpi_b/rpi_b.c +++ b/board/raspberrypi/rpi_b/rpi_b.c @@ -42,6 +42,12 @@ struct msg_get_arm_mem { u32 end_tag; }; +struct msg_get_board_rev { + struct bcm2835_mbox_hdr hdr; + struct bcm2835_mbox_tag_get_board_rev get_board_rev; + u32 end_tag; +}; + struct msg_get_mac_address { struct bcm2835_mbox_hdr hdr; struct bcm2835_mbox_tag_get_mac_address get_mac_address; @@ -60,6 +66,67 @@ struct msg_get_clock_rate { u32 end_tag; }; +/* See comments in mbox.h for data source */ +static const struct { + const char *name; + const char *fdtfile; +} models[] = { + [BCM2835_BOARD_REV_B_I2C0_2] = { + "Model B (no P5)", + "bcm2835-rpi-b-i2c0.dtb", + }, + [BCM2835_BOARD_REV_B_I2C0_3] = { + "Model B (no P5)", + "bcm2835-rpi-b-i2c0.dtb", + }, + [BCM2835_BOARD_REV_B_I2C1_4] = { + "Model B", + "bcm2835-rpi-b.dtb", + }, + [BCM2835_BOARD_REV_B_I2C1_5] = { + "Model B", + "bcm2835-rpi-b.dtb", + }, + [BCM2835_BOARD_REV_B_I2C1_6] = { + "Model B", + "bcm2835-rpi-b.dtb", + }, + [BCM2835_BOARD_REV_A_7] = { + "Model A", + "bcm2835-rpi-a.dtb", + }, + [BCM2835_BOARD_REV_A_8] = { + "Model A", + "bcm2835-rpi-a.dtb", + }, + [BCM2835_BOARD_REV_A_9] = { + "Model A", + "bcm2835-rpi-a.dtb", + }, + [BCM2835_BOARD_REV_B_REV2_d] = { + "Model B rev2", + "bcm2835-rpi-b-rev2.dtb", + }, + [BCM2835_BOARD_REV_B_REV2_e] = { + "Model B rev2", + "bcm2835-rpi-b-rev2.dtb", + }, + [BCM2835_BOARD_REV_B_REV2_f] = { + "Model B rev2", + "bcm2835-rpi-b-rev2.dtb", + }, + [BCM2835_BOARD_REV_B_PLUS] = { + "Model B+", + "bcm2835-rpi-b-plus.dtb", + }, + [BCM2835_BOARD_REV_CM] = { + "Compute Module", + "bcm2835-rpi-cm.dtb", + }, +}; + +u32 rpi_board_rev = 0; + int dram_init(void) { ALLOC_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1, 16); @@ -79,13 +146,27 @@ int dram_init(void) return 0; } -int misc_init_r(void) +static void set_fdtfile(void) +{ + const char *fdtfile; + + if (getenv("fdtfile")) + return; + + fdtfile = models[rpi_board_rev].fdtfile; + if (!fdtfile) + fdtfile = "bcm2835-rpi-other.dtb"; + + setenv("fdtfile", fdtfile); +} + +static void set_usbethaddr(void) { ALLOC_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1, 16); int ret; if (getenv("usbethaddr")) - return 0; + return; BCM2835_MBOX_INIT_HDR(msg); BCM2835_MBOX_INIT_TAG(&msg->get_mac_address, GET_MAC_ADDRESS); @@ -94,11 +175,18 @@ int misc_init_r(void) if (ret) { printf("bcm2835: Could not query MAC address\n"); /* Ignore error; not critical */ - return 0; + return; } eth_setenv_enetaddr("usbethaddr", msg->get_mac_address.body.resp.mac); + return; +} + +int misc_init_r(void) +{ + set_fdtfile(); + set_usbethaddr(); return 0; } @@ -126,8 +214,36 @@ static int power_on_module(u32 module) return 0; } +static void get_board_rev(void) +{ + ALLOC_ALIGN_BUFFER(struct msg_get_board_rev, msg, 1, 16); + int ret; + const char *name; + + BCM2835_MBOX_INIT_HDR(msg); + BCM2835_MBOX_INIT_TAG(&msg->get_board_rev, GET_BOARD_REV); + + ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr); + if (ret) { + printf("bcm2835: Could not query board revision\n"); + /* Ignore error; not critical */ + return; + } + + rpi_board_rev = msg->get_board_rev.body.resp.rev; + if (rpi_board_rev >= ARRAY_SIZE(models)) + rpi_board_rev = 0; + + name = models[rpi_board_rev].name; + if (!name) + name = "Unknown model"; + printf("RPI model: %s\n", name); +} + int board_init(void) { + get_board_rev(); + gd->bd->bi_boot_params = 0x100; return power_on_module(BCM2835_MBOX_POWER_DEVID_USB_HCD); |