[PATCH v5 1/3] ARM: OMAP: Beagle: revision detection

Robert Nelson
2010-08-18T15:57:04Z

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 <robertcnelson@gmail.com>
Cc: Jarkko Nikula <jhnikula@gmail.com>
---
arch/arm/mach-omap2/board-omap3beagle.c | 90 +++++++++++++++++++++++++++++++
1 files changed, 90 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 87969c7..62d69a9 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -50,6 +50,95 @@

#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(173);
+fail1:
+ gpio_free(172);
+fail0:
+ gpio_free(171);
+
+ 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 +553,7 @@ 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));
--
1.7.0.4