Add PECI init

src/board/system76/lemp9/main.c

@@ -51,11 +51,9 @@ void init(void) {
     kbscan_init();
     pwm_init();
     smbus_init();
+    peci_init();
 
-    //TODO: INTC, PECI
-
-    // Allow PECI pin to be used
-    GCR2 |= (1 << 4);
+    //TODO: INTC
 }
 
 void ac_adapter() {

src/board/system76/lemp9/peci.c

@@ -2,6 +2,7 @@
 
 #include <board/peci.h>
 #include <common/debug.h>
+#include <ec/gpio.h>
 #include <ec/pwm.h>
 
 // Tjunction = 100C for i7-8565U (and probably the same for all WHL-U)
@@ -16,6 +17,16 @@ static bool peci_config_loaded = false;
 
 #define PECI_TEMP(X) (((int16_t)(X)) << 6)
 
+void peci_init(void) {
+    // Allow PECI pin to be used
+    GCR2 |= (1 << 4);
+
+    // Set frequency to 1MHz
+    HOCTL2R = 0x01;
+    // Set VTT to 1V
+    PADCTLR = 0x02;
+}
+
 // Read tjmax using index 16 of RdPkgConfig
 static void peci_config(void) {
     // Wait for completion

src/ec/it5570e/include/ec/peci.h

@@ -13,5 +13,6 @@ static volatile uint8_t __xdata __at(0x3006) HOWRDR;
 static volatile uint8_t __xdata __at(0x3007) HORDDR;
 static volatile uint8_t __xdata __at(0x3008) HOCTL2R;
 static volatile uint8_t __xdata __at(0x3009) RWFCSV;
+static volatile uint8_t __xdata __at(0x300E) PADCTLR;
 
 #endif // _EC_PECI_H