1From 8098310be5887bd5e80830f105b63ed59dc10421 Mon Sep 17 00:00:00 2001
2From: Alexander Filippov <a.filippov@yadro.com>
3Date: Fri, 22 May 2020 11:45:31 +0300
4Subject: [PATCH] aspeed: add bmc position support
5
6There are two Nicoles in one chassis in the Tatlin hardware.
7The position is encoded by a pin, read by an MCU, and then translated
8to the BMC via GPIO pin GPIOE1.
9
10This reads the GPIO pin state and put is as a bootargs item.
11
12Signed-off-by: Alexander Filippov <a.filippov@yadro.com>
13---
14 arch/arm/mach-aspeed/ast-late-init.c | 21 +++++++++++++++++++++
15 1 file changed, 21 insertions(+)
16
17diff --git a/arch/arm/mach-aspeed/ast-late-init.c b/arch/arm/mach-aspeed/ast-late-init.c
18index 5646c0e882..7d36dc0d8a 100644
19--- a/arch/arm/mach-aspeed/ast-late-init.c
20+++ b/arch/arm/mach-aspeed/ast-late-init.c
21@@ -7,6 +7,7 @@
22
23 #include <asm/arch/ast_scu.h>
24 #include <asm/arch/regs-scu.h>
25+#include <asm/gpio.h>
26 #include <malloc.h>
27
28 static void update_bootargs_cmd(const char *key, const char *value)
29@@ -106,9 +107,29 @@ static void set_reset_reason(void)
30     }
31 }
32
33+static void set_bmc_position(void)
34+{
35+    unsigned gpio = ASPEED_GPIO(E, 1);
36+
37+    /* Init GPIO */
38+    if (gpio_request(gpio, "bmcposition") == 0 &&
39+        gpio_direction_input(gpio) == 0)
40+    {
41+        int position = gpio_get_value(gpio);
42+        if (position >= 0)
43+        {
44+            printf("BMC Position: %d\n", position);
45+            update_bootargs_cmd("bmcposition", position ? "1" : "0");
46+        }
47+    }
48+
49+    gpio_free(gpio);
50+}
51+
52 int board_late_init(void)
53 {
54     set_reset_reason();
55+    set_bmc_position();
56
57     return 0;
58 }
59--
602.25.4
61
62