[PATCHv4 3/6] omap3: Introduce function to detect the IGEP v2 hardware revision.
Enric Balletbo i Serra
eballetbo at gmail.com
Tue Oct 5 10:15:19 EDT 2010
There are currently two versions of IGEP v2 board, this patch introduces a
function to detect the hardware revision of IGEP board.
--------------------------
| Id. | Hw Rev. | GPIO 28 |
--------------------------
| 0 | B/C | high |
| 1 | C | low |
--------------------------
Signed-off-by: Enric Balletbo i Serra <eballetbo at gmail.com>
---
arch/arm/mach-omap2/board-igep0020.c | 47 ++++++++++++++++++++++++++++++++++
1 files changed, 47 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/board-igep0020.c b/arch/arm/mach-omap2/board-igep0020.c
index 83a30ce..5510f95 100644
--- a/arch/arm/mach-omap2/board-igep0020.c
+++ b/arch/arm/mach-omap2/board-igep0020.c
@@ -45,6 +45,49 @@
#define IGEP2_GPIO_WIFI_NPD 94
#define IGEP2_GPIO_WIFI_NRESET 95
+/*
+ * IGEP2 Hardware Revision Table
+ *
+ * --------------------------
+ * | Id. | Hw Rev. | HW0 (28) |
+ * --------------------------
+ * | 0 | B/C | high |
+ * | 1 | C | low |
+ * --------------------------
+ */
+
+#define IGEP2_BOARD_HWREV_B 0
+#define IGEP2_BOARD_HWREV_C 1
+
+static u8 hwrev;
+
+static void __init igep2_get_revision(void)
+{
+ u8 ret;
+
+ omap_mux_init_gpio(IGEP2_GPIO_LED1_RED, OMAP_PIN_INPUT);
+
+ if ((gpio_request(IGEP2_GPIO_LED1_RED, "GPIO_HW0_REV") == 0) &&
+ (gpio_direction_input(IGEP2_GPIO_LED1_RED) == 0)) {
+ ret = gpio_get_value(IGEP2_GPIO_LED1_RED);
+ if (ret == 0) {
+ pr_info("IGEP2: Hardware Revision C (B-NON compatible)\n");
+ hwrev = IGEP2_BOARD_HWREV_C;
+ } else if (ret == 1) {
+ pr_info("IGEP2: Hardware Revision B/C (B compatible)\n");
+ hwrev = IGEP2_BOARD_HWREV_B;
+ } else {
+ pr_err("IGEP2: Unknown Hardware Revision\n");
+ hwrev = -1;
+ }
+ } else {
+ pr_warning("IGEP2: Could not obtain gpio GPIO_HW0_REV\n");
+ pr_err("IGEP2: Unknown Hardware Revision\n");
+ }
+
+ gpio_free(IGEP2_GPIO_LED1_RED);
+}
+
#if defined(CONFIG_MTD_ONENAND_OMAP2) || \
defined(CONFIG_MTD_ONENAND_OMAP2_MODULE)
@@ -537,6 +580,10 @@ static struct omap_board_mux board_mux[] __initdata = {
static void __init igep2_init(void)
{
omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
+
+ /* Get IGEP2 hardware revision */
+ igep2_get_revision();
+
igep2_i2c_init();
platform_add_devices(igep2_devices, ARRAY_SIZE(igep2_devices));
omap_serial_init();
--
1.7.0.4
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