[coreboot] r614 - in coreboot-v3/mainboard/artecgroup: . dbe62

[svn at coreboot.org]

Author: rminnich
Date: 2008-02-21 21:34:35 +0100 (Thu, 21 Feb 2008)
New Revision: 614

Added:
   coreboot-v3/mainboard/artecgroup/dbe62/
   coreboot-v3/mainboard/artecgroup/dbe62/initram.c
Log:
Initial support for the dbe62. The next step is to get these timings 
correct, and then populate the rest of the files. I am putting this in 
now so others can help get the timing right.

Signed-off-by: Ronald G. Minnich <rminnich at gmail.com>
Acked-by: Marc Jones <marc.jones at amd.com>



Added: coreboot-v3/mainboard/artecgroup/dbe62/initram.c
===================================================================
--- coreboot-v3/mainboard/artecgroup/dbe62/initram.c	                        (rev 0)
+++ coreboot-v3/mainboard/artecgroup/dbe62/initram.c	2008-02-21 20:34:35 UTC (rev 614)
@@ -0,0 +1,155 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007 Advanced Micro Devices, Inc.
+ * Copyright (C) 2007 Ronald G. Minnich
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#define _MAINOBJECT
+
+#include <types.h>
+#include <lib.h>
+#include <console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <string.h>
+#include <msr.h>
+#include <io.h>
+#include <amd_geodelx.h>
+#include <northbridge/amd/geodelx/raminit.h>
+#include <spd.h>
+
+#define MANUALCONF 0		/* Do automatic strapped PLL config */
+#define PLLMSRHI 0x00001490	/* manual settings for the PLL */
+#define PLLMSRLO 0x02000030
+#define DIMM0 ((u8) 0xA0)
+#define DIMM1 ((u8) 0xA2)
+
+/* The part is a Micron MT46V16M16 P 5B 
+ * 4 M x 16 x 5 Banks, 200 Mhz, Plastic package, TSOP, DDR400B, 5 ns CL3
+ * Commercial rating. 
+ * @ 200 ns, data-out window, 1.6; access, +- 70 ns; dqs-dq skew: .4ns
+ * http://www.micron.com/products/partdetail?part=MT46V16M16P-5B
+ */
+struct spd_entry {
+	u8 address;
+	u8 data;
+};
+
+/* Save space by using a short list of SPD values used by Geode LX Memory init */
+
+static const struct spd_entry spdbytes[] = {
+	{SPD_ACCEPTABLE_CAS_LATENCIES,  0x10},
+	{SPD_BANK_DENSITY,  0x40},
+	{SPD_DEVICE_ATTRIBUTES_GENERAL,  0xff},
+	{SPD_MEMORY_TYPE,  7},
+	{SPD_MIN_CYCLE_TIME_AT_CAS_MAX,  10, /* A guess for the tRAC value */
+	{SPD_MODULE_ATTRIBUTES,  0xff, /* FIXME later when we figure out. */
+	{SPD_NUM_BANKS_PER_SDRAM,  4},
+	{SPD_PRIMARY_SDRAM_WIDTH,  8},
+	{SPD_NUM_DIMM_BANKS,  1},
+	{SPD_NUM_COLUMNS,  0xa},
+	{SPD_NUM_ROWS,  3},
+	{SPD_REFRESH,  0x3a},
+	{SPD_SDRAM_CYCLE_TIME_2ND,  60},
+	{SPD_SDRAM_CYCLE_TIME_3RD,  75},
+	{SPD_tRAS,  40},
+	{SPD_tRCD,  15},
+	{SPD_tRFC,  70},
+	{SPD_tRP,  15},
+	{SPD_tRRD,  10,
+};
+
+
+/**
+ * Given an SMBUS device, and an address in that device, return the value of SPD
+ * for that device. In this mainboard, the only one that can return is DIMM0. 
+ * @param device The device number
+ * @param address The address in SPD rom to return the value of
+ * @returns The value
+ */ 
+static u8 spd_read_byte(u16 device, u8 address)
+{
+	int i;
+	/* returns 0xFF on any failures */
+	u8 ret = 0xff;
+
+	printk(BIOS_DEBUG, "spd_read_byte dev %04x\n", device);
+	if (device == DIMM0){
+		for (i=0; i < (sizeof spd_table/sizeof spd_table[0]); i++){
+			if (spd_table[i].address == address){
+				ret = spd_table[i].data;
+			}
+		}
+	}
+
+	printk(BIOS_DEBUG, " addr %02x returns %02x\n", address, ret);
+	return ret;
+}
+
+/**
+  * Placeholder in case we ever need it. Since this file is a
+  * template for other motherboards, we want this here and we want the
+  * call in the right place.
+  */
+
+static void mb_gpio_init(void)
+{
+	/* Early mainboard specific GPIO setup */
+}
+
+/** 
+  * main for initram for the PC Engines Alix 1C.  It might seem that you
+  * could somehow do these functions in, e.g., the cpu code, but the
+  * order of operations and what those operations are is VERY strongly
+  * mainboard dependent. It's best to leave it in the mainboard code.
+  */
+int main(void)
+{
+	u8 smb_devices[] =  {
+		DIMM0, DIMM1
+	};
+	printk(BIOS_DEBUG, "Hi there from stage1\n");
+	post_code(POST_START_OF_MAIN);
+
+	system_preinit();
+	printk(BIOS_DEBUG, "done preinit\n");
+
+	mb_gpio_init();
+	printk(BIOS_DEBUG, "done gpio init\n");
+
+	pll_reset(MANUALCONF, PLLMSRHI, PLLMSRLO);
+	printk(BIOS_DEBUG, "done pll reset\n");
+
+	cpu_reg_init(0, DIMM0, DIMM1);
+	printk(BIOS_DEBUG, "done cpu reg init\n");
+
+	sdram_set_registers();
+	printk(BIOS_DEBUG, "done sdram set registers\n");
+
+	sdram_set_spd_registers(DIMM0, DIMM1);
+	printk(BIOS_DEBUG, "done sdram set spd registers\n");
+
+	sdram_enable(DIMM0, DIMM1);
+	printk(BIOS_DEBUG, "done sdram enable\n");
+
+	/* Check low memory */
+	/*ram_check(0x00000000, 640*1024); */
+
+	printk(BIOS_DEBUG, "stage1 returns\n");
+	return 0;
+}