Require Intel for PECI, add empty AMD power module

PECI is an Intel-only mechanism for getting CPU temp. AMD will use
SB-TSI to get temps.

Add empty power functions for AMD so the project will compile with AMD
selected.

Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/board/system76/common/acpi.c

@@ -7,11 +7,14 @@
 #include <board/gpio.h>
 #include <board/kbled.h>
 #include <board/lid.h>
-#include <board/peci.h>
 #include <board/pwm.h>
 #include <common/debug.h>
 #include <common/macro.h>
 
+#if CONFIG_PLATFORM_INTEL
+#include <board/peci.h>
+#endif
+
 #ifndef HAVE_LED_AIRPLANE_N
 #define HAVE_LED_AIRPLANE_N 1
 #endif // HAVE_LED_AIRPLANE_N
@@ -113,7 +116,9 @@ uint8_t acpi_read(uint8_t addr) {
             }
             break;
 
+#if CONFIG_PLATFORM_INTEL
         ACPI_8(0x07, peci_temp);
+#endif
 
         // Handle AC adapter and battery present
         case 0x10:

src/board/system76/common/common.mk

@@ -14,7 +14,6 @@ board-common-y += keymap.c
 board-common-y += lid.c
 board-common-y += main.c
 board-common-y += parallel.c
-board-common-y += peci.c
 board-common-y += pmc.c
 board-common-y += pnp.c
 board-common-y += ps2.c
@@ -42,8 +41,12 @@ CFLAGS+=-DLEVEL=4
 #CFLAGS+=-DI2C_DEBUGGER=0x76
 
 ifeq ($(CONFIG_PLATFORM_INTEL),y)
+board-common-y += peci.c
 board-common-y += power/intel.c
 CFLAGS += -DCONFIG_PLATFORM_INTEL=1
+else ifeq ($(CONFIG_PLATFORM_AMD),y)
+board-common-y += power/amd.c
+CFLAGS += -DCONFIG_PLATFORM_AMD=1
 else
 $(error PLATFORM not specified)
 endif

src/board/system76/common/fan.c

@@ -2,12 +2,15 @@
 
 #include <board/fan.h>
 #include <board/dgpu.h>
-#include <board/peci.h>
 #include <board/power.h>
 #include <common/debug.h>
 #include <common/macro.h>
 #include <ec/pwm.h>
 
+#if CONFIG_PLATFORM_INTEL
+#include <board/peci.h>
+#endif
+
 bool fan_max = false;
 
 uint8_t fan1_pwm_actual = 0;
@@ -195,11 +198,16 @@ static uint16_t fan_get_tach1_rpm(void) {
 }
 
 void fan_event(void) {
+#if CONFIG_PLATFORM_INTEL
 #if CONFIG_HAVE_DGPU
     int16_t sys_temp = MAX(peci_temp, dgpu_temp);
 #else
     int16_t sys_temp = peci_temp;
 #endif
+#elif CONFIG_PLATFORM_AMD
+    // TODO: AMD SB-TSI temp
+    int16_t sys_temp = 50;
+#endif
 
     // Fan update interval is 100ms (main.c). The event changes PWM duty
     // by 1 every interval to give a smoothing effect.

src/board/system76/common/include/board/power.h

@@ -17,7 +17,6 @@ void power_init(void);
 void power_on(void);
 void power_off(void);
 void power_cpu_reset(void);
-
 void power_event(void);
 
 #endif // _BOARD_POWER_H

src/board/system76/common/main.c

@@ -18,7 +18,6 @@
 #include <board/kbscan.h>
 #include <board/keymap.h>
 #include <board/lid.h>
-#include <board/peci.h>
 #include <board/pmc.h>
 #include <board/power.h>
 #include <board/ps2.h>
@@ -31,6 +30,10 @@
 #include <common/version.h>
 #include <ec/ec.h>
 
+#if CONFIG_PLATFORM_INTEL
+#include <board/peci.h>
+#endif
+
 #ifdef PARALLEL_DEBUG
 #include <board/parallel.h>
 #endif // PARALLEL_DEBUG
@@ -73,7 +76,9 @@ void init(void) {
         kbscan_init();
     }
     keymap_init();
+#if CONFIG_PLATFORM_INTEL
     peci_init();
+#endif
     pmc_init();
     pwm_init();
     smbus_init();
@@ -140,7 +145,9 @@ void main(void) {
             if ((time - last_time_250ms) >= INTERVAL_250MS) {
                 last_time_250ms = time;
 
+#if CONFIG_PLATFORM_INTEL
                 peci_read_temp();
+#endif
                 dgpu_read_temp();
             }
 

src/board/system76/common/power/amd.c

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
+#include <board/power.h>
+
+enum PowerState power_state = POWER_STATE_OFF;
+
+void update_power_state(void) {}
+void power_init(void) {}
+void power_on(void) {}
+void power_off(void) {}
+void power_cpu_reset(void) {}
+void power_event(void) {}

src/board/system76/common/power/intel.c

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
+#include <board/power.h>
+
 #include <arch/delay.h>
 #include <arch/time.h>
 #include <board/acpi.h>
@@ -12,7 +14,6 @@
 #include <board/kbled.h>
 #include <board/lid.h>
 #include <board/peci.h>
-#include <board/power.h>
 #include <board/pmc.h>
 #include <board/pnp.h>
 #include <board/wireless.h>