62 lines
1.6 KiB
Diff
62 lines
1.6 KiB
Diff
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From 8098310be5887bd5e80830f105b63ed59dc10421 Mon Sep 17 00:00:00 2001
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From: Alexander Filippov <a.filippov@yadro.com>
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Date: Fri, 22 May 2020 11:45:31 +0300
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Subject: [PATCH] aspeed: add bmc position support
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There are two Nicoles in one chassis in the Tatlin hardware.
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The position is encoded by a pin, read by an MCU, and then translated
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to the BMC via GPIO pin GPIOE1.
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This reads the GPIO pin state and put is as a bootargs item.
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Signed-off-by: Alexander Filippov <a.filippov@yadro.com>
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---
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arch/arm/mach-aspeed/ast-late-init.c | 21 +++++++++++++++++++++
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1 file changed, 21 insertions(+)
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diff --git a/arch/arm/mach-aspeed/ast-late-init.c b/arch/arm/mach-aspeed/ast-late-init.c
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index 5646c0e882..7d36dc0d8a 100644
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--- a/arch/arm/mach-aspeed/ast-late-init.c
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+++ b/arch/arm/mach-aspeed/ast-late-init.c
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@@ -7,6 +7,7 @@
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#include <asm/arch/ast_scu.h>
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#include <asm/arch/regs-scu.h>
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+#include <asm/gpio.h>
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#include <malloc.h>
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static void update_bootargs_cmd(const char *key, const char *value)
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@@ -106,9 +107,29 @@ static void set_reset_reason(void)
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}
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}
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+static void set_bmc_position(void)
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+{
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+ unsigned gpio = ASPEED_GPIO(E, 1);
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+
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+ /* Init GPIO */
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+ if (gpio_request(gpio, "bmcposition") == 0 &&
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+ gpio_direction_input(gpio) == 0)
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+ {
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+ int position = gpio_get_value(gpio);
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+ if (position >= 0)
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+ {
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+ printf("BMC Position: %d\n", position);
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+ update_bootargs_cmd("bmcposition", position ? "1" : "0");
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+ }
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+ }
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+
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+ gpio_free(gpio);
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+}
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+
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int board_late_init(void)
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{
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set_reset_reason();
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+ set_bmc_position();
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return 0;
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}
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--
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2.25.4
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