From 954bed046fe57724851879a9db813eecb1d15f55 Mon Sep 17 00:00:00 2001 From: Robert Nelson Date: Thu, 23 Sep 2010 18:22:47 -0700 Subject: [PATCH] omap: Beagle: revision detection Due to the omap3530 ES3.0 Silicon being used on both the B5/B6 and C1/2/3 Beagle we can't use the cpu_is_omap34xx() routines to differentiate the Beagle Boards. However gpio pins 171,172,173 where setup for this prupose, so lets use them. Changes: for older U-Boot's, use omap_mux_init_gpio() keep Beagle Rev in board-omap3beagle.c gpio_free on gpio request failure Tested on Beagle Revisions: B5, C2, C4, and xMA Signed-off-by: Robert Nelson Acked-by: Jarkko Nikula Signed-off-by: Tony Lindgren --- arch/arm/mach-omap2/board-omap3beagle.c | 88 +++++++++++++++++++++++++ 1 file changed, 88 insertions(+) diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c index 87969c7df65..1aebb3f4f20 100644 --- a/arch/arm/mach-omap2/board-omap3beagle.c +++ b/arch/arm/mach-omap2/board-omap3beagle.c @@ -50,6 +50,93 @@ #define NAND_BLOCK_SIZE SZ_128K +/* + * OMAP3 Beagle revision + * Run time detection of Beagle revision is done by reading GPIO. + * GPIO ID - + * AXBX = GPIO173, GPIO172, GPIO171: 1 1 1 + * C1_3 = GPIO173, GPIO172, GPIO171: 1 1 0 + * C4 = GPIO173, GPIO172, GPIO171: 1 0 1 + * XM = GPIO173, GPIO172, GPIO171: 0 0 0 + */ +enum { + OMAP3BEAGLE_BOARD_UNKN = 0, + OMAP3BEAGLE_BOARD_AXBX, + OMAP3BEAGLE_BOARD_C1_3, + OMAP3BEAGLE_BOARD_C4, + OMAP3BEAGLE_BOARD_XM, +}; + +static u8 omap3_beagle_version; + +static u8 omap3_beagle_get_rev(void) +{ + return omap3_beagle_version; +} + +static void __init omap3_beagle_init_rev(void) +{ + int ret; + u16 beagle_rev = 0; + + omap_mux_init_gpio(171, OMAP_PIN_INPUT_PULLUP); + omap_mux_init_gpio(172, OMAP_PIN_INPUT_PULLUP); + omap_mux_init_gpio(173, OMAP_PIN_INPUT_PULLUP); + + ret = gpio_request(171, "rev_id_0"); + if (ret < 0) + goto fail0; + + ret = gpio_request(172, "rev_id_1"); + if (ret < 0) + goto fail1; + + ret = gpio_request(173, "rev_id_2"); + if (ret < 0) + goto fail2; + + gpio_direction_input(171); + gpio_direction_input(172); + gpio_direction_input(173); + + beagle_rev = gpio_get_value(171) | (gpio_get_value(172) << 1) + | (gpio_get_value(173) << 2); + + switch (beagle_rev) { + case 7: + printk(KERN_INFO "OMAP3 Beagle Rev: Ax/Bx\n"); + omap3_beagle_version = OMAP3BEAGLE_BOARD_AXBX; + break; + case 6: + printk(KERN_INFO "OMAP3 Beagle Rev: C1/C2/C3\n"); + omap3_beagle_version = OMAP3BEAGLE_BOARD_C1_3; + break; + case 5: + printk(KERN_INFO "OMAP3 Beagle Rev: C4\n"); + omap3_beagle_version = OMAP3BEAGLE_BOARD_C4; + break; + case 0: + printk(KERN_INFO "OMAP3 Beagle Rev: xM\n"); + omap3_beagle_version = OMAP3BEAGLE_BOARD_XM; + break; + default: + printk(KERN_INFO "OMAP3 Beagle Rev: unknown %hd\n", beagle_rev); + omap3_beagle_version = OMAP3BEAGLE_BOARD_UNKN; + } + + return; + +fail2: + gpio_free(172); +fail1: + gpio_free(171); +fail0: + printk(KERN_ERR "Unable to get revision detection GPIO pins\n"); + omap3_beagle_version = OMAP3BEAGLE_BOARD_UNKN; + + return; +} + static struct mtd_partition omap3beagle_nand_partitions[] = { /* All the partition sizes are listed in terms of NAND block size */ { @@ -464,6 +551,7 @@ static struct omap_musb_board_data musb_board_data = { static void __init omap3_beagle_init(void) { omap3_mux_init(board_mux, OMAP_PACKAGE_CBB); + omap3_beagle_init_rev(); omap3_beagle_i2c_init(); platform_add_devices(omap3_beagle_devices, ARRAY_SIZE(omap3_beagle_devices)); -- 2.20.1