From 6fe7845a9823c12aa673ad3590059528c184b987 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Tue, 18 Nov 2014 21:40:21 -0700 Subject: 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 Reviewed-by: Simon Glass Tested-by: Simon Glass --- arch/arm/include/asm/arch-bcm2835/mbox.h | 33 ++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'arch/arm/include/asm/arch-bcm2835/mbox.h') diff --git a/arch/arm/include/asm/arch-bcm2835/mbox.h b/arch/arm/include/asm/arch-bcm2835/mbox.h index 61f427d914..0289ba6a91 100644 --- a/arch/arm/include/asm/arch-bcm2835/mbox.h +++ b/arch/arm/include/asm/arch-bcm2835/mbox.h @@ -119,6 +119,39 @@ struct bcm2835_mbox_tag_hdr { * }; */ +#define BCM2835_MBOX_TAG_GET_BOARD_REV 0x00010002 + +/* + * 0x2..0xf from: + * http://raspberryalphaomega.org.uk/2013/02/06/automatic-raspberry-pi-board-revision-detection-model-a-b1-and-b2/ + * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=32733 + * 0x10, 0x11 from swarren's testing + */ +#define BCM2835_BOARD_REV_B_I2C0_2 0x2 +#define BCM2835_BOARD_REV_B_I2C0_3 0x3 +#define BCM2835_BOARD_REV_B_I2C1_4 0x4 +#define BCM2835_BOARD_REV_B_I2C1_5 0x5 +#define BCM2835_BOARD_REV_B_I2C1_6 0x6 +#define BCM2835_BOARD_REV_A_7 0x7 +#define BCM2835_BOARD_REV_A_8 0x8 +#define BCM2835_BOARD_REV_A_9 0x9 +#define BCM2835_BOARD_REV_B_REV2_d 0xd +#define BCM2835_BOARD_REV_B_REV2_e 0xe +#define BCM2835_BOARD_REV_B_REV2_f 0xf +#define BCM2835_BOARD_REV_B_PLUS 0x10 +#define BCM2835_BOARD_REV_CM 0x11 + +struct bcm2835_mbox_tag_get_board_rev { + struct bcm2835_mbox_tag_hdr tag_hdr; + union { + struct { + } req; + struct { + u32 rev; + } resp; + } body; +}; + #define BCM2835_MBOX_TAG_GET_MAC_ADDRESS 0x00010003 struct bcm2835_mbox_tag_get_mac_address { -- cgit v1.2.1