From 4062f179a755ca3b303f444ee3ef812fb287f9f1 Mon Sep 17 00:00:00 2001
From: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
Date: Tue, 21 May 2013 03:13:46 +0200
Subject: Lenovo X60: Add int15 handler

Without that commit, with CONFIG_PCI_OPTION_ROM_RUN_YABEL,
  The VGA option rom doesn't init the right display:
  it initializes the external display, where we have
  a black scren(with backlight on).

This commit is based on the code of mainboard.c in
  src/mainboard/roda/rk886ex.

Change-Id: I8457aaf0503e0efdf0fcba9ff5e8a07ac04c5ca6
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
Reviewed-on: http://review.coreboot.org/3265
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
---
 src/mainboard/lenovo/x60/mainboard.c | 40 ++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

(limited to 'src/mainboard/lenovo/x60')

diff --git a/src/mainboard/lenovo/x60/mainboard.c b/src/mainboard/lenovo/x60/mainboard.c
index 032d64160a..d2d0733487 100644
--- a/src/mainboard/lenovo/x60/mainboard.c
+++ b/src/mainboard/lenovo/x60/mainboard.c
@@ -28,6 +28,7 @@
 #include <device/pci_ops.h>
 #include <device/pci_ids.h>
 #include <arch/io.h>
+#include <arch/interrupt.h>
 #include <ec/lenovo/pmh7/pmh7.h>
 #include <ec/acpi/ec.h>
 #include <ec/lenovo/h8/h8.h>
@@ -35,6 +36,8 @@
 #include <pc80/mc146818rtc.h>
 #include "dock.h"
 #include <arch/x86/include/arch/acpigen.h>
+#include <x86emu/x86emu.h>
+#define PANEL INT15_5F35_CL_DISPLAY_DEFAULT
 
 int i915lightup(unsigned int physbase, unsigned int iobase, unsigned int mmio,
         unsigned int gfx);
@@ -45,6 +48,37 @@ static acpi_cstate_t cst_entries[] = {
 	{ 2, 17,  250, { 0x01, 8, 0, { 0 }, DEFAULT_PMBASE + LV3, 0 } },
 };
 
+#if CONFIG_PCI_OPTION_ROM_RUN_YABEL || CONFIG_PCI_OPTION_ROM_RUN_REALMODE
+static int int15_handler(void)
+{
+	/* The right way to do this is to move this handler code into
+	 * the mainboard or northbridge code.
+	 * TODO: completely move to mainboards / chipsets.
+	 */
+	printk(BIOS_DEBUG, "%s: AX=%04x BX=%04x CX=%04x DX=%04x\n",
+	       __func__, X86_AX, X86_BX, X86_CX, X86_DX);
+
+	switch (X86_AX) {
+	case 0x5f35: /* Boot Display */
+		X86_AX = 0x005f; // Success
+		X86_CL = PANEL;
+		break;
+	case 0x5f40: /* Boot Panel Type */
+		X86_AX = 0x005f; // Success
+		X86_CL = 3;
+		printk(BIOS_DEBUG, "DISPLAY=%x\n", X86_CL);
+		break;
+	default:
+		/* Interrupt was not handled */
+		printk(BIOS_DEBUG, "Unknown INT15 function %04x!\n", X86_AX);
+		return 0;
+	}
+
+	/* Interrupt handled */
+	return 1;
+}
+#endif
+
 int get_cst_entries(acpi_cstate_t **entries)
 {
 	*entries = cst_entries;
@@ -61,6 +95,12 @@ static void mainboard_enable(device_t dev)
 		ec_set_bit(0x03, 2);
 		ec_write(0x0c, 0x88);
 	}
+
+#if CONFIG_PCI_OPTION_ROM_RUN_YABEL || CONFIG_PCI_OPTION_ROM_RUN_REALMODE
+	/* Install custom int15 handler for VGA OPROM */
+	mainboard_interrupt_handlers(0x15, &int15_handler);
+#endif
+
 	/* If we're resuming from suspend, blink suspend LED */
 	dev0 = dev_find_slot(0, PCI_DEVFN(0,0));
 	if (dev0 && pci_read_config32(dev0, SKPAD) == SKPAD_ACPI_S3_MAGIC)
-- 
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