Add preliminary SPI flash identification support for SPI chips attached to ITE IT8716F Super I/O

Right now this is hardcoded to the Gigabyte M57SLI board. It works only
with rev 2.0 of the board, but it will bail out on earlier versions, so
no damage can occur.

Corresponding to flashrom svn r139 and coreboot v2 svn r2811.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Ward Vandewege <ward@gnu.org>

1 files changed, 101 insertions, 0 deletions

diff --git a/board_enable.c b/board_enable.c
index 89519b2..43ca02c 100644
--- a/board_enable.c
+++ b/board_enable.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2005-2007 coresystems GmbH <stepan@coresystems.de>
  * Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
  * Copyright (C) 2007 Luc Verhaegen <libv@skynet.be>
+ * Copyright (C) 2007 Carl-Daniel Hailfinger
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -29,6 +30,104 @@
 #include <string.h>
 #include "flash.h"
 
+/* Generic Super I/O helper functions */
+uint8_t regval(uint16_t port, uint8_t reg)
+{
+	outb(reg, port);
+	return inb(port + 1);
+}
+
+void regwrite(uint16_t port, uint8_t reg, uint8_t val)
+{
+	outb(reg, port);
+	outb(val, port + 1);
+}
+
+/* Helper functions for most recent ITE IT87xx Super I/O chips */
+#define CHIP_ID_BYTE1_REG	0x20
+#define CHIP_ID_BYTE2_REG	0x21
+static void enter_conf_mode_ite(uint16_t port)
+{
+	outb(0x87, port);
+	outb(0x01, port);
+	outb(0x55, port);
+	if (port == 0x2e)
+		outb(0x55, port);
+	else
+		outb(0xaa, port);
+}
+
+static void exit_conf_mode_ite(uint16_t port)
+{
+	regwrite(port, 0x02, 0x02);
+}
+
+static uint16_t find_ite_serial_flash_port(uint16_t port)
+{
+	uint8_t tmp = 0;
+	uint16_t id, flashport = 0;
+
+	enter_conf_mode_ite(port);
+
+	id = regval(port, CHIP_ID_BYTE1_REG) << 8;
+	id |= regval(port, CHIP_ID_BYTE2_REG);
+
+	/* TODO: Handle more IT87xx if they support flash translation */
+	if (id == 0x8716) {
+		/* NOLDN, reg 0x24, mask out lowest bit (suspend) */
+		tmp = regval(port, 0x24) & 0xFE;
+		printf("Serial flash segment 0x%08x-0x%08x %sabled\n",
+			0xFFFE0000, 0xFFFFFFFF, (tmp & 1 << 1) ? "en" : "dis");
+		printf("Serial flash segment 0x%08x-0x%08x %sabled\n",
+			0x000E0000, 0x000FFFFF, (tmp & 1 << 1) ? "en" : "dis");
+		printf("Serial flash segment 0x%08x-0x%08x %sabled\n",
+			0xFFEE0000, 0xFFEFFFFF, (tmp & 1 << 2) ? "en" : "dis");
+		printf("Serial flash segment 0x%08x-0x%08x %sabled\n",
+			0xFFF80000, 0xFFFEFFFF, (tmp & 1 << 3) ? "en" : "dis");
+		printf("LPC write to serial flash %sabled\n",
+			(tmp & 1 << 4) ? "en" : "dis");
+		printf("serial flash pin %i\n",	(tmp & 1 << 5) ? 87 : 29);
+		/* LDN 0x7, reg 0x64/0x65 */
+		regwrite(port, 0x07, 0x7);
+		flashport = regval(port, 0x64) << 8;
+		flashport |= regval(port, 0x65);
+	}
+	exit_conf_mode_ite(port);
+	return flashport;
+}
+
+static void it8716_serial_rdid(uint16_t port)
+{
+	uint8_t busy, data0, data1, data2;
+	do {
+		busy = inb(port) & 0x80;
+	} while (busy);
+	/* RDID */
+	outb(0x9f, port + 1);
+	/* Start IO, 33MHz, 3 input bytes, 0 output bytes*/
+	outb((0x5<<4)|(0x3<<2)|(0x0), port);
+	do {
+		busy = inb(port) & 0x80;
+	} while (busy);
+	data0 = inb(port + 5);
+	data1 = inb(port + 6);
+	data2 = inb(port + 7);
+	printf("RDID returned %02x %02x %02x\n", data0, data1, data2);
+	return;
+}
+
+static int it87xx_probe_serial_flash(const char *name)
+{
+	uint16_t flashport;
+	flashport = find_ite_serial_flash_port(0x2e);
+	if (flashport)
+		it8716_serial_rdid(flashport);
+	flashport = find_ite_serial_flash_port(0x4e);
+	if (flashport)
+		it8716_serial_rdid(flashport);
+	return 0;
+}
+
 /*
  * Helper functions for many Winbond Super I/Os of the W836xx range.
  */
@@ -314,6 +413,8 @@ struct board_pciid_enable {
 };
 
 struct board_pciid_enable board_pciid_enables[] = {
+	{0x10de, 0x0360, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
+	 "gigabyte", "m57sli", "GIGABYTE GA-M57SLI", it87xx_probe_serial_flash},
 	{0x1022, 0x7468, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 	 "iwill", "dk8_htx", "IWILL DK8-HTX", w83627hf_gpio24_raise},
 	{0x1022, 0x746B, 0x1022, 0x36C0, 0x0000, 0x0000, 0x0000, 0x0000,