From 395578c94f1fe2a5bcb40a6daf6c10eb411eda5a Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jeremy@system76.com>
Date: Tue, 2 Nov 2021 13:45:38 -0600
Subject: [PATCH] Add post code ring-buffer support

---
 src/board/system76/common/pnp.c | 11 +++++++++++
 src/ec/ite/ec.c                 | 11 +++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/board/system76/common/pnp.c b/src/board/system76/common/pnp.c
index 7dff19aa9..fe0b5db9c 100644
--- a/src/board/system76/common/pnp.c
+++ b/src/board/system76/common/pnp.c
@@ -5,6 +5,7 @@
 #include <board/pnp.h>
 #include <common/macro.h>
 #include <common/debug.h>
+#include <ec/bram.h>
 #include <ec/espi.h>
 
 volatile uint8_t __xdata __at(0x1200) IHIOA;
@@ -73,4 +74,14 @@ void pnp_enable() {
     // Enable SWUC
     pnp_write(0x07, 0x04);
     pnp_write(0x30, 0x01);
+
+#ifdef POST_CODE_RING_BUFFER
+    // Set up ring-buffer for POST codes
+    for (uint8_t i = 0x80; i <= 0xBF; i++) {
+        BRAM[i] = 0;
+    }
+    pnp_write(0x07, 0x10);
+    pnp_write(0xF3, 0x00);
+    pnp_write(0xF4, 0x3F);
+#endif // POST_CODE_RING_BUFFER
 }
diff --git a/src/ec/ite/ec.c b/src/ec/ite/ec.c
index a8d077ec5..9e241eae3 100644
--- a/src/ec/ite/ec.c
+++ b/src/ec/ite/ec.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
+#include <ec/bram.h>
 #include <ec/ec.h>
 #include <ec/gctrl.h>
 #include <common/debug.h>
@@ -23,7 +24,17 @@ void ec_read_post_codes(void) {
         uint8_t p81h = P81HD;
         P80H81HS |= 1;
 
+#ifdef POST_CODE_RING_BUFFER
+        DEBUG("POST %02X%02X:", p81h, p80h);
+
+        // Also dump ring-buffer
+        for (uint8_t i = 0x80; i <= 0xBF; i+=2) {
+            DEBUG(" %02X%02X", BRAM[i + 1], BRAM[i]);
+        }
+        DEBUG("\n");
+#else // POST_CODE_RING_BUFFER
         DEBUG("POST %02X%02X\n", p81h, p80h);
+#endif // POST_CODE_RING_BUFFER
     }
 #endif
 }