Initial support for the Intel 82830 northbridge and RCA RM4100 board.

Signed-off-by: Joseph Smith <joe@smittys.pointclark.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3129 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 508 insertions, 0 deletions

diff --git a/src/northbridge/intel/i82830/raminit.c b/src/northbridge/intel/i82830/raminit.c
new file mode 100644
index 0000000000..1deb2572c8
--- /dev/null
+++ b/src/northbridge/intel/i82830/raminit.c
@@ -0,0 +1,508 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008 Joseph Smith <joe@smittys.pointclark.net>
+ *
+ * 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
+ *
+ */
+
+#include <spd.h>
+#include <sdram_mode.h>
+#include <delay.h>
+#include "debug.c"
+#include "i82830.h"
+
+/*-----------------------------------------------------------------------------
+Macros and definitions.
+-----------------------------------------------------------------------------*/
+
+/* Uncomment this to enable debugging output. */
+/* #define DEBUG_RAM_SETUP 1 */
+
+/* Debugging macros. */
+#if defined(DEBUG_RAM_SETUP)
+#define PRINT_DEBUG(x)		print_debug(x)
+#define PRINT_DEBUG_HEX8(x)	print_debug_hex8(x)
+#define PRINT_DEBUG_HEX16(x)	print_debug_hex16(x)
+#define PRINT_DEBUG_HEX32(x)	print_debug_hex32(x)
+#define DUMPNORTH()		dump_pci_device(PCI_DEV(0, 0, 0))
+#else
+#define PRINT_DEBUG(x)
+#define PRINT_DEBUG_HEX8(x)
+#define PRINT_DEBUG_HEX16(x)
+#define PRINT_DEBUG_HEX32(x)
+#define DUMPNORTH()
+#endif
+
+/* DRC[10:8] - Refresh Mode Select (RMS).
+ * 0x0 for Refresh Disabled (Self Refresh)
+ * 0x1 for Refresh interval 15.6 us for 133MHz
+ * 0x2 for Refresh interval 7.8 us for 133MHz
+ * 0x7 /* Refresh interval 128 Clocks. (Fast Refresh Mode)
+ */
+#define RAM_COMMAND_REFRESH		0x2
+
+/* DRC[6:4] - SDRAM Mode Select (SMS). */
+#define RAM_COMMAND_SELF_REFRESH	0x0
+#define RAM_COMMAND_NOP			0x1
+#define RAM_COMMAND_PRECHARGE		0x2
+#define RAM_COMMAND_MRS			0x3
+#define RAM_COMMAND_CBR			0x6
+#define RAM_COMMAND_NORMAL		0x7
+
+/* DRC[29] - Initialization Complete (IC). */
+#define RAM_COMMAND_IC			0x1
+
+/*-----------------------------------------------------------------------------
+SDRAM configuration functions.
+-----------------------------------------------------------------------------*/
+
+/* Send the specified RAM command to all DIMMs. */
+
+static void do_ram_command(const struct mem_controller *ctrl, uint32_t command,
+			   uint32_t addr_offset)
+{
+	int i;
+	uint8_t reg8, reg8_2 = 0;
+	uint32_t reg32;
+
+	/* Configure the RAM command. */
+	reg32 = pci_read_config32(ctrl->d0, DRC);
+	/* Clear bits 29, 10-8, 6-4. */
+	reg32 &= 0xdffff88f;
+	reg32 |= command << 4;
+	/* If RAM_COMMAND_NORMAL set the refresh mode and IC bit. */
+	if (command == RAM_COMMAND_NORMAL)
+		reg32 |= ((RAM_COMMAND_REFRESH << 8) | (RAM_COMMAND_IC << 29));
+	pci_write_config32(ctrl->d0, DRC, reg32);
+
+	/* RAM_COMMAND_NORMAL affects only the memory controller and
+	   doesn't need to be "sent" to the DIMMs. */
+	/* if (command == RAM_COMMAND_NORMAL) return; */
+
+	PRINT_DEBUG("    Sending RAM command 0x");
+	PRINT_DEBUG_HEX32(reg32);
+	PRINT_DEBUG(" to 0x");
+	PRINT_DEBUG_HEX32(0 + addr_offset);
+	PRINT_DEBUG("\r\n");
+
+	/* NOTE: Dual-sided ready. */
+	read32(0 + addr_offset);
+	for (i = 0; i < 4; i++) {
+		reg8 = pci_read_config8(ctrl->d0, DRB + i);
+		if (reg8 != reg8_2)
+			read32(reg8 * 32 * 1024 * 1024);
+		reg8_2 = reg8;
+	}
+}
+
+/*-----------------------------------------------------------------------------
+DIMM-independant configuration functions.
+-----------------------------------------------------------------------------*/
+
+struct dimm_size {
+	unsigned long side1;
+	unsigned long side2;
+};
+
+static struct dimm_size spd_get_dimm_size(unsigned device)
+{
+	struct dimm_size sz;
+	int i, module_density, dimm_banks;
+	sz.side1 = 0;
+	module_density = spd_read_byte(device, 31);
+	dimm_banks = spd_read_byte(device, 5);
+
+	/* Find the size of side1. */
+	/* Find the larger value. The larger value is always side1. */
+	for (i = 512; i >= 0; i >>= 1) {
+		if ((module_density & i) == i) {
+			sz.side1 = i;
+			break;
+		}
+	}
+
+	/* Set to 0 in case it's single sided. */
+	sz.side2 = 0;
+
+	/* Test if it's a dual-sided DIMM. */
+	if (dimm_banks > 1) {
+		/* Test to see if there's a second value, if so it's asymmetrical. */
+		if (module_density != i) {
+			/* Find the second value, picking up where we left off. */
+			/* i >>= 1 done initially to make sure we don't get the same value again. */
+			for (i >>= 1; i >= 0; i >>= 1) {
+				if (module_density == (sz.side1 | i)) {
+					sz.side2 = i;
+					break;
+				}
+			}
+			/* If not, it's symmetrical */
+		} else {
+			sz.side2 = sz.side1;
+		}
+	}
+
+	/* SPD byte 31 is the memory size divided by 4 so we
+	 * need to muliply by 4 to get the total size.
+	 */
+	sz.side1 *= 4;
+	sz.side2 *= 4;
+	return sz;
+}
+
+static void spd_set_dram_size(const struct mem_controller *ctrl)
+{
+	int i, value, drb1, drb2;
+
+	for (i = 0; i < DIMM_SOCKETS; i++) {
+		struct dimm_size sz;
+		unsigned device;
+		device = ctrl->channel0[i];
+		drb1 = 0;
+		drb2 = 0;
+
+		/* First check if a DIMM is actually present. */
+		if (spd_read_byte(device, 2) == 0x4) {
+			print_debug("Found DIMM in slot ");
+			print_debug_hex8(i);
+			print_debug("\r\n");
+
+			sz = spd_get_dimm_size(device);
+
+			/* WISHLIST: would be nice to display it as decimal? */
+			print_debug("DIMM is 0x");
+			print_debug_hex16(sz.side1);
+			print_debug(" on side 1\r\n");
+			print_debug("DIMM is 0x");
+			print_debug_hex16(sz.side2);
+			print_debug(" on side 2\r\n");
+
+			/* Test for PC133 (i82830 only supports PC133) */
+			/* PC133 SPD9 - cycle time is always 75 */
+			if (spd_read_byte(device, 9) != 0x75) {
+				print_err("SPD9 DIMM Is Not PC133 Compatable\r\n");
+				die("HALT\r\n");
+			}
+			/* PC133 SPD10 - access time is always 54 */
+			if (spd_read_byte(device, 10) != 0x54) {
+				print_err("SPD10 DIMM Is Not PC133 Compatable\r\n");
+				die("HALT\r\n");
+			}
+
+			/* The i82830 only supports a symmetrical dual-sided dimms
+			 * and can't handle DIMMs smaller than 32MB per
+			 * side or larger than 256MB per side.
+			 */
+			if ((sz.side2 != 0) && (sz.side1 != sz.side2)) {
+				print_err("This northbridge only supports\r\n");
+				print_err("symmetrical dual-sided DIMMs\r\n");
+				print_err("booting as a single-sided DIMM\r\n");
+				sz.side2 = 0;
+			}
+			if ((sz.side1 < 32)) {
+				print_err("DIMMs smaller than 32MB per side\r\n");
+				print_err("are not supported on this northbridge\r\n");
+				die("HALT\r\n");
+			}
+
+			if ((sz.side1 > 256)) {
+				print_err
+				    ("DIMMs larger than 256MB per side\r\n");
+				print_err
+				    ("are not supported on this northbridge\r\n");
+				die("HALT\r\n");
+			}
+
+			/* We need to divide size by 32 to set up the
+			 * DRB registers.
+			 */
+			if (sz.side1)
+				drb1 = sz.side1 / 32;
+			if (sz.side2)
+				drb2 = sz.side2 / 32;
+		} else {
+			PRINT_DEBUG("No DIMM found in slot ");
+			PRINT_DEBUG_HEX8(i);
+			PRINT_DEBUG("\r\n");
+
+			/* If there's no DIMM in the slot, set value to 0. */
+			drb1 = 0;
+			drb2 = 0;
+		}
+		/* Set the value for DRAM Row Boundary Registers */
+		if (i == 0) {
+			pci_write_config8(ctrl->d0, DRB, drb1);
+			pci_write_config8(ctrl->d0, DRB + 1, drb1 + drb2);
+			PRINT_DEBUG("DRB 0x");
+			PRINT_DEBUG_HEX8(DRB);
+			PRINT_DEBUG(" has been set to 0x");
+			PRINT_DEBUG_HEX8(drb1);
+			PRINT_DEBUG("\r\n");
+			PRINT_DEBUG("DRB1 0x");
+			PRINT_DEBUG_HEX8(DRB + 1);
+			PRINT_DEBUG(" has been set to 0x");
+			PRINT_DEBUG_HEX8(drb1 + drb2);
+			PRINT_DEBUG("\r\n");
+		} else if (i == 1) {
+			value = pci_read_config8(ctrl->d0, DRB + 1);
+			pci_write_config8(ctrl->d0, DRB + 2, value + drb1);
+			pci_write_config8(ctrl->d0, DRB + 3,
+					  value + drb1 + drb2);
+			PRINT_DEBUG("DRB2 0x");
+			PRINT_DEBUG_HEX8(DRB + 2);
+			PRINT_DEBUG(" has been set to 0x");
+			PRINT_DEBUG_HEX8(value + drb1);
+			PRINT_DEBUG("\r\n");
+			PRINT_DEBUG("DRB3 0x");
+			PRINT_DEBUG_HEX8(DRB + 3);
+			PRINT_DEBUG(" has been set to 0x");
+			PRINT_DEBUG_HEX8(value + drb1 + drb2);
+			PRINT_DEBUG("\r\n");
+
+			/* We need to set the highest DRB value to 0x64 and 0x65.
+			 * These are supposed to be "Reserved" but memory will
+			 * not initialize properly if we don't.
+			 */
+			value = pci_read_config8(ctrl->d0, DRB + 3);
+			pci_write_config8(ctrl->d0, DRB + 4, value);
+			pci_write_config8(ctrl->d0, DRB + 5, value);
+		}
+	}
+}
+
+static void set_dram_row_attributes(const struct mem_controller *ctrl)
+{
+	int i, dra, col, width, value;
+
+	for (i = 0; i < DIMM_SOCKETS; i++) {
+		unsigned device;
+		device = ctrl->channel0[i];
+
+		/* First check if a DIMM is actually present. */
+		if (spd_read_byte(device, 2) == 0x4) {
+			print_debug("Found DIMM in slot ");
+			print_debug_hex8(i);
+			print_debug(", setting DRA...\r\n");
+
+			dra = 0x00;
+
+			/* columns */
+			col = spd_read_byte(device, 4);
+
+			/* data width */
+			width = spd_read_byte(device, 6);
+
+			/* calculate page size in bits */
+			value = ((1 << col) * width);
+
+			/* convert to Kilobytes */
+			dra = ((value / 8) >> 10);
+
+			/* # of banks of DIMM (single or double sided) */
+			value = spd_read_byte(device, 5);
+
+			if (value == 1) {
+				switch (dra) {
+				case 2: /* 2KB */
+					dra = 0xF0;
+					break;
+				case 4: /* 4KB */
+					dra = 0xF1;
+					break;
+				case 8: /* 8KB */
+					dra = 0xF2;
+					break;
+				case 16: /* 16KB */
+					dra = 0xF3;
+					break;
+				default:
+					print_err("Page size not supported\r\n");
+					die("HALT\r\n");
+				}
+			} else if (value == 2) {
+				switch (dra) {
+				case 2: /* 2KB */
+					dra = 0x00;
+					break;
+				case 4: /* 4KB */
+					dra = 0x11;
+					break;
+				case 8: /* 8KB */
+					dra = 0x22;
+					break;
+				case 16: /* 16KB */
+					dra = 0x33;
+					break;
+				default:
+					print_err("Page size not supported\r\n");
+					die("HALT\r\n");
+				}
+			} else {
+				print_err("# of banks of DIMM not supported\r\n");
+				die("HALT\r\n");
+			}
+
+		} else {
+			PRINT_DEBUG("No DIMM found in slot ");
+			PRINT_DEBUG_HEX8(i);
+			PRINT_DEBUG(", setting DRA to 0xFF\r\n");
+
+			/* If there's no DIMM in the slot, set dra value to 0xFF. */
+			dra = 0xFF;
+		}
+
+		/* Set the value for DRAM Row Attribute Registers */
+		pci_write_config8(ctrl->d0, DRA + i, dra);
+		PRINT_DEBUG("DRA 0x");
+		PRINT_DEBUG_HEX8(DRA + i);
+		PRINT_DEBUG(" has been set to 0x");
+		PRINT_DEBUG_HEX8(dra);
+		PRINT_DEBUG("\r\n");
+	}
+}
+
+static void set_dram_timing(const struct mem_controller *ctrl)
+{
+	/* Set the value for DRAM Timing Register */
+	/* TODO: Configure the value according to SPD values. */
+	pci_write_config32(ctrl->d0, DRT, 0x00000010);
+}
+
+static void set_dram_buffer_strength(const struct mem_controller *ctrl)
+{
+	/* TODO: This needs to be set according to the DRAM tech
+	 * (x8, x16, or x32). Argh, Intel provides no docs on this!
+	 * Currently, it needs to be pulled from the output of
+	 * lspci -xxx Rx92
+	 */
+
+	/* Set the value for System Memory Buffer Strength Control Registers */
+	pci_write_config32(ctrl->d0, BUFF_SC, 0xFC9B491B);
+}
+
+/*-----------------------------------------------------------------------------
+Public interface.
+-----------------------------------------------------------------------------*/
+
+static void sdram_set_registers(const struct mem_controller *ctrl)
+{
+	uint16_t value;
+	int igd_memory = 0;
+
+	PRINT_DEBUG("Setting initial registers....\r\n");
+
+	/* Set the value for GMCH Control Register #0 */
+	pci_write_config16(ctrl->d0, GCC0, 0xA072);
+
+	/* Set the value for GMCH Control Register #1 */
+	switch (CONFIG_VIDEO_MB) {
+	case 512: /* 512K of memory */
+		igd_memory = 0x2;
+		break;
+	case 1: /* 1M of memory */
+		igd_memory = 0x3;
+		break;
+	case 8: /* 8M of memory */
+		igd_memory = 0x4;
+		break;
+	default: /* No memory */
+		pci_write_config16(ctrl->d0, GCC1, 0x0002);
+		igd_memory = 0x0;
+	}
+
+	value = pci_read_config16(ctrl->d0, GCC1);
+	value |= igd_memory << 4;
+	pci_write_config16(ctrl->d0, GCC1, value);
+
+	/* Set the value for Aperture Base Configuration Register */
+	pci_write_config32(ctrl->d0, APBASE, 0x00000008);
+
+	/* Set the value for Register Range Base Address Register */
+	pci_write_config32(ctrl->d0, RRBAR, 0x00000000);
+
+	/* Set the value for Fixed DRAM Hole Control Register */
+	pci_write_config8(ctrl->d0, FDHC, 0x00);
+
+	/* Set the value for Programable Attribute Map Registers
+	 * Ideally, this should be R/W for as many ranges as possible.
+	 */
+	pci_write_config8(ctrl->d0, PAM0, 0x30);
+	pci_write_config8(ctrl->d0, PAM1, 0x33);
+	pci_write_config8(ctrl->d0, PAM2, 0x33);
+	pci_write_config8(ctrl->d0, PAM3, 0x33);
+	pci_write_config8(ctrl->d0, PAM4, 0x33);
+	pci_write_config8(ctrl->d0, PAM5, 0x33);
+	pci_write_config8(ctrl->d0, PAM6, 0x33);
+
+	/* Set the value for DRAM Throttling Control Register */
+	pci_write_config32(ctrl->d0, DTC, 0x00000000);
+
+	/* Set the value for System Management RAM Control Register */
+	pci_write_config8(ctrl->d0, SMRAM, 0x02);
+
+	/* Set the value for Extended System Management RAM Control Register */
+	pci_write_config8(ctrl->d0, ESMRAMC, 0x38);
+
+	PRINT_DEBUG("Initial registers have been set.\r\n");
+}
+
+static void sdram_set_spd_registers(const struct mem_controller *ctrl)
+{
+	spd_set_dram_size(ctrl);
+	set_dram_row_attributes(ctrl);
+	set_dram_timing(ctrl);
+	set_dram_buffer_strength(ctrl);
+}
+
+static void sdram_enable(int controllers, const struct mem_controller *ctrl)
+{
+	int i;
+
+	/* 0. Wait until power/voltages and clocks are stable (200us). */
+	udelay(200);
+
+	/* 1. Apply NOP. */
+	PRINT_DEBUG("RAM Enable 1: Apply NOP\r\n");
+	do_ram_command(ctrl, RAM_COMMAND_NOP, 0);
+	udelay(200);
+
+	/* 2. Precharge all. Wait tRP. */
+	PRINT_DEBUG("RAM Enable 2: Precharge all\r\n");
+	do_ram_command(ctrl, RAM_COMMAND_PRECHARGE, 0);
+	udelay(1);
+
+	/* 3. Perform 8 refresh cycles. Wait tRC each time. */
+	PRINT_DEBUG("RAM Enable 3: CBR\r\n");
+	for (i = 0; i < 8; i++) {
+		do_ram_command(ctrl, RAM_COMMAND_CBR, 0);
+		udelay(1);
+	}
+
+	/* 4. Mode register set. Wait two memory cycles. */
+	/* TODO: Set offset according to DRT values */
+	PRINT_DEBUG("RAM Enable 4: Mode register set\r\n");
+	do_ram_command(ctrl, RAM_COMMAND_MRS, 0x1d0);
+	udelay(2);
+
+	/* 5. Normal operation (enables refresh) */
+	PRINT_DEBUG("RAM Enable 5: Normal operation\r\n");
+	do_ram_command(ctrl, RAM_COMMAND_NORMAL, 0);
+	udelay(1);
+
+	PRINT_DEBUG("Northbridge following SDRAM init:\r\n");
+	DUMPNORTH();
+}