Move gpio_debug from board to EC code

The gpio_debug() functionality depends on the ITE registers and not
anything board-specific.

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

src/ec/ite/gpio.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 #include <ec/gpio.h>
+#include <common/debug.h>
 
 bool gpio_get(struct Gpio *gpio) {
     if (*(gpio->data) & gpio->value) {
@@ -17,3 +18,43 @@ void gpio_set(struct Gpio *gpio, bool value) {
         *(gpio->data) &= ~(gpio->value);
     }
 }
+
+#ifdef GPIO_DEBUG
+static void gpio_debug_bank(
+    char *bank,
+    uint8_t data,
+    uint8_t mirror,
+    uint8_t pot,
+    volatile uint8_t *control
+) {
+    for (char i = 0; i < 8; i++) {
+        DEBUG(
+            "%s%d: data %d mirror %d pot %d control %02X\n",
+            bank,
+            i,
+            (data >> i) & 1,
+            (mirror >> i) & 1,
+            (pot >> i) & 1,
+            *(control + i)
+        );
+    }
+}
+
+void gpio_debug(void) {
+#define bank(BANK) gpio_debug_bank(#BANK, GPDR##BANK, GPDMR##BANK, GPOT##BANK, &GPCR##BANK##0)
+    bank(A);
+    bank(B);
+    bank(C);
+    bank(D);
+    bank(E);
+    bank(F);
+    bank(G);
+    bank(H);
+    bank(I);
+    bank(J);
+#define GPOTM 0
+    bank(M);
+#undef GPOTM
+#undef bank
+}
+#endif // GPIO_DEBUG

src/ec/ite/include/ec/gpio.h

@@ -35,6 +35,10 @@ struct Gpio {
 bool gpio_get(struct Gpio *gpio);
 void gpio_set(struct Gpio *gpio, bool value);
 
+#ifdef GPIO_DEBUG
+void gpio_debug(void);
+#endif
+
 volatile uint8_t __xdata __at(0x1600) GCR;
 volatile uint8_t __xdata __at(0x16F0) GCR1;
 volatile uint8_t __xdata __at(0x16F1) GCR2;