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omap3: Introduce function to detect the IGEP v2 hardwarerevision

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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@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Enric Balletbo i Serra 2010-10-08 10:22:35 -07:00 committed by Tony Lindgren
parent bee1539064
commit 3f8c48d95f
1 changed files with 47 additions and 0 deletions
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47
arch/arm/mach-omap2/board-igep0020.c
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@ -46,6 +46,49 @@
#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)
@ -538,6 +581,10 @@ 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();