Add support for the AMD/ATI SB600 southbridge SPI functionality

This has been tested by Uwe Hermann on an RS690/SB600 board.

Reviewed-by: Joe Bao <zheng.bao@amd.com>

Corresponding to flashrom svn r351 and coreboot v2 svn r3779.

Signed-off-by: Jason Wang <Qingpei.Wang@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

7 files changed, 245 insertions, 19 deletions

diff --git a/Makefile b/Makefile
index 09c68de..c79d402 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@ OBJS = chipset_enable.o board_enable.o udelay.o jedec.o stm50flw0x0x.o \
 	w49f002u.o 82802ab.o pm49fl00x.o sst49lf040.o en29f002a.o \
 	sst49lfxxxc.o sst_fwhub.o layout.o cbtable.o flashchips.o \
 	flashrom.o w39v080fa.o sharplhf00l04.o w29ee011.o spi.o it87spi.o \
-	ichspi.o w39v040c.o
+	ichspi.o w39v040c.o sb600spi.o
 
 all: pciutils dep $(PROGRAM)
 
diff --git a/chipset_enable.c b/chipset_enable.c
index 658313d..22eceb2 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -647,21 +647,36 @@ static int enable_flash_amd8111(struct pci_dev *dev, const char *name)
 
 static int enable_flash_sb600(struct pci_dev *dev, const char *name)
 {
-	uint32_t old, new;
+	uint32_t tmp, low_bits, num;
 	uint8_t reg;
 
-	/* Clear ROM Protect 0-3 */
+	low_bits = tmp = pci_read_long(dev, 0xa0);
+	low_bits &= ~0xffffc000; /* for mmap aligning requirements */
+	low_bits &= 0xfffffff0;	/* remove low 4 bits */
+	tmp &= 0xffffc000;
+	printf_debug("SPI base address is at 0x%x\n", tmp + low_bits);
+
+	sb600_spibar = mmap(0, 0x4000, PROT_READ | PROT_WRITE, MAP_SHARED,
+			    fd_mem, (off_t)tmp);
+	if (sb600_spibar == MAP_FAILED) {
+		perror("Can't mmap memory using " MEM_DEV);
+		exit(1);
+	}
+	sb600_spibar += low_bits;
+
+	/* Clear ROM protect 0-3. */
 	for (reg = 0x50; reg < 0x60; reg += 4) {
-		old = pci_read_long(dev, reg);
-		new = old & 0xFFFFFFFC;
-		if (new != old) {
-			pci_write_byte(dev, reg, new);
-			if (pci_read_long(dev, reg) != new) {
-				printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x50, new, name);
-			}
-		}
+		num = pci_read_long(dev, reg);
+		num &= 0xfffffffc;
+		pci_write_byte(dev, reg, num);
 	}
 
+	flashbus = BUS_TYPE_SB600_SPI;
+
+	/* Enable SPI ROM in SB600 PM register. */
+	OUTB(0x8f, 0xcd6);
+	OUTB(0x0e, 0xcd7);
+
 	return 0;
 }
 
diff --git a/flash.h b/flash.h
index d1e417f..cbc2e48 100644
--- a/flash.h
+++ b/flash.h
@@ -414,6 +414,7 @@ typedef enum {
 	BUS_TYPE_ICH7_SPI,
 	BUS_TYPE_ICH9_SPI,
 	BUS_TYPE_IT87XX_SPI,
+	BUS_TYPE_SB600_SPI,
 	BUS_TYPE_VIA_SPI
 } flashbus_t;
 
@@ -497,6 +498,14 @@ int it8716f_spi_command(unsigned int writecnt, unsigned int readcnt,
 int it8716f_spi_chip_read(struct flashchip *flash, uint8_t *buf);
 int it8716f_spi_chip_write(struct flashchip *flash, uint8_t *buf);
 
+/* sb600spi.c */
+int sb600_spi_command(unsigned int writecnt, unsigned int readcnt,
+		      const unsigned char *writearr, unsigned char *readarr);
+int sb600_spi_read(struct flashchip *flash, uint8_t *buf);
+int sb600_spi_write(struct flashchip *flash, uint8_t *buf);
+uint8_t sb600_read_status_register(void);
+extern uint8_t volatile *sb600_spibar;
+
 /* jedec.c */
 uint8_t oddparity(uint8_t val);
 void toggle_ready_jedec(volatile uint8_t *dst);
diff --git a/flashrom.c b/flashrom.c
index 4f1b488..9357d04 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -463,7 +463,7 @@ int main(int argc, char *argv[])
 				perror(filename);
 				exit(1);
 			}
-			printf("Force reading flash...");
+			printf("Force reading flash... ");
 			if (!flashes[0]->read)
 				memcpy(buf, (const char *)flashes[0]->virtual_memory, size);
 			else
@@ -476,7 +476,7 @@ int main(int argc, char *argv[])
 
 			fwrite(buf, sizeof(char), size, image);
 			fclose(image);
-			printf("done\n");
+			printf("done.\n");
 			free(buf);
 			exit(0);
 		}
@@ -533,19 +533,20 @@ int main(int argc, char *argv[])
 	buf = (uint8_t *) calloc(size, sizeof(char));
 
 	if (erase_it) {
-		printf("Erasing flash chip.\n");
+		printf("Erasing flash chip... ");
 		if (!flash->erase) {
 			fprintf(stderr, "Error: flashrom has no erase function for this flash chip.\n");
 			return 1;
 		}
 		flash->erase(flash);
+		printf("done.\n");
 		exit(0);
 	} else if (read_it) {
 		if ((image = fopen(filename, "w")) == NULL) {
 			perror(filename);
 			exit(1);
 		}
-		printf("Reading Flash...");
+		printf("Reading flash... ");
 		if (flash->read == NULL)
 			memcpy(buf, (const char *)flash->virtual_memory, size);
 		else
@@ -557,7 +558,7 @@ int main(int argc, char *argv[])
 
 		fwrite(buf, sizeof(char), size, image);
 		fclose(image);
-		printf("done\n");
+		printf("done.\n");
 	} else {
 		struct stat image_stat;
 
diff --git a/sb600spi.c b/sb600spi.c
new file mode 100644
index 0000000..0350403
--- /dev/null
+++ b/sb600spi.c
@@ -0,0 +1,175 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2008 Stefan Wildemann <stefan.wildemann@kontron.com>
+ * Copyright (C) 2008 Claus Gindhart <claus.gindhart@kontron.com>
+ * Copyright (C) 2008 Dominik Geyer <dominik.geyer@kontron.com>
+ *
+ * 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 <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <sys/mman.h>
+#include <pci/pci.h>
+#include "flash.h"
+#include "spi.h"
+
+typedef struct _spi_controller {
+	unsigned int spi_cntrl0;	/* 00h */
+	unsigned int restrictedcmd1;	/* 04h */
+	unsigned int restrictedcmd2;	/* 08h */
+	unsigned int spi_cntrl1;	/* 0ch */
+	unsigned int spi_cmdvalue0;	/* 10h */
+	unsigned int spi_cmdvalue1;	/* 14h */
+	unsigned int spi_cmdvalue2;	/* 18h */
+	unsigned int spi_fakeid;	/* 1Ch */
+} sb600_spi_controller;
+
+sb600_spi_controller *spi_bar = NULL;
+uint8_t volatile *sb600_spibar;
+
+int sb600_spi_read(struct flashchip *flash, uint8_t *buf)
+{
+	int rc = 0, i;
+	int total_size = flash->total_size * 1024;
+	int page_size = 8;
+
+	for (i = 0; i < total_size / page_size; i++)
+		spi_nbyte_read(i * page_size, (void *)(buf + i * page_size),
+			       page_size);
+	return rc;
+}
+
+uint8_t sb600_read_status_register(void)
+{
+	const unsigned char cmd[0x02] = { JEDEC_RDSR, 0x00 };
+	unsigned char readarr[JEDEC_RDSR_INSIZE];
+
+	/* Read Status Register */
+	spi_command(sizeof(cmd), sizeof(readarr), cmd, readarr);
+	return readarr[0];
+}
+
+int sb600_spi_write(struct flashchip *flash, uint8_t *buf)
+{
+	int rc = 0, i;
+	int total_size = flash->total_size * 1024;
+
+	/* Erase first */
+	printf("Erasing flash before programming... ");
+	flash->erase(flash);
+	printf("done.\n");
+
+	printf("Programming flash");
+	for (i = 0; i < total_size; i++, buf++) {
+		spi_disable_blockprotect();
+		spi_write_enable();
+		spi_byte_program(i, *buf);
+		/* wait program complete. */
+		if (i % 0x8000 == 0)
+			printf(".");
+		while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
+			;
+	}
+	printf(" done.\n");
+	return rc;
+}
+
+void reset_internal_fifo_pointer(void)
+{
+	sb600_spibar[2] |= 0x10;
+
+	while (sb600_spibar[0xD] & 0x7)
+		printf("reset\n");
+}
+
+void execute_command(void)
+{
+	sb600_spibar[2] |= 1;
+
+	while (sb600_spibar[2] & 1)
+		;
+}
+
+int sb600_spi_command(unsigned int writecnt, unsigned int readcnt,
+		      const unsigned char *writearr, unsigned char *readarr)
+{
+	int count;
+	/* First byte is cmd which can not being sent through FIFO. */
+	unsigned char cmd = *writearr++;
+
+	writecnt--;
+
+	spi_bar = (sb600_spi_controller *) sb600_spibar;
+
+	printf_debug("%s, cmd=%x, writecnt=%x, readcnt=%x\n",
+		     __func__, cmd, writecnt, readcnt);
+
+	if (readcnt > 8) {
+		printf("%s, SB600 SPI controller can not receive %d bytes, "
+		       "which is limited with 8 bytes\n", __func__, readcnt);
+		return 1;
+	}
+
+	if (writecnt > 8) {
+		printf("%s, SB600 SPI controller can not sent %d bytes, "
+		       "which is limited with 8 bytes\n", __func__, writecnt);
+		return 1;
+	}
+
+	sb600_spibar[0] = cmd;
+	sb600_spibar[1] = readcnt << 4 | (writecnt);
+
+	/* Before we use the FIFO, reset it first. */
+	reset_internal_fifo_pointer();
+
+	/* Send the write byte to FIFO. */
+	for (count = 0; count < writecnt; count++, writearr++) {
+		printf_debug(" [%x]", *writearr);
+		sb600_spibar[0xC] = *writearr;
+	}
+	printf_debug("\n");
+
+	/*
+	 * We should send the data by sequence, which means we need to reset
+	 * the FIFO pointer to the first byte we want to send.
+	 */
+	reset_internal_fifo_pointer();
+
+	execute_command();
+
+	/*
+	 * After the command executed, we should find out the index of the
+	 * received byte. Here we just reset the FIFO pointer, skip the
+	 * writecnt, is there anyone who have anther method to replace it?
+	 */
+	reset_internal_fifo_pointer();
+
+	for (count = 0; count < writecnt; count++) {
+		cmd = sb600_spibar[0xC];	/* Skip the byte we send. */
+		printf_debug("[ %2x]", cmd);
+	}
+
+	printf_debug("The FIFO pointer 6 is %d.\n", sb600_spibar[0xd] & 0x07);
+	for (count = 0; count < readcnt; count++, readarr++) {
+		*readarr = sb600_spibar[0xC];
+		printf_debug("[%02x]", *readarr);
+	}
+	printf_debug("\n");
+
+	return 0;
+}
diff --git a/spi.c b/spi.c
index 8812eff..b31a6b8 100644
--- a/spi.c
+++ b/spi.c
@@ -42,6 +42,8 @@ int spi_command(unsigned int writecnt, unsigned int readcnt,
 	case BUS_TYPE_ICH9_SPI:
 	case BUS_TYPE_VIA_SPI:
 		return ich_spi_command(writecnt, readcnt, writearr, readarr);
+	case BUS_TYPE_SB600_SPI:
+		return sb600_spi_command(writecnt, readcnt, writearr, readarr);
 	default:
 		printf_debug
 		    ("%s called, but no SPI chipset/strapping detected\n",
@@ -157,6 +159,7 @@ int probe_spi_rdid4(struct flashchip *flash)
 	case BUS_TYPE_ICH7_SPI:
 	case BUS_TYPE_ICH9_SPI:
 	case BUS_TYPE_VIA_SPI:
+	case BUS_TYPE_SB600_SPI:
 		return probe_spi_rdid_generic(flash, 4);
 	default:
 		printf_debug("4b ID not supported on this SPI controller\n");
@@ -229,7 +232,13 @@ uint8_t spi_read_status_register()
 	unsigned char readarr[JEDEC_RDSR_INSIZE];
 
 	/* Read Status Register */
-	spi_command(sizeof(cmd), sizeof(readarr), cmd, readarr);
+	if (flashbus == BUS_TYPE_SB600_SPI) {
+		/* SB600 uses a different way to read status register. */
+		return sb600_read_status_register();
+	} else {
+		spi_command(sizeof(cmd), sizeof(readarr), cmd, readarr);
+	}
+
 	return readarr[0];
 }
 
@@ -464,6 +473,14 @@ int spi_sector_erase(const struct flashchip *flash, unsigned long addr)
 	return 0;
 }
 
+int spi_write_status_enable()
+{
+	const unsigned char cmd[JEDEC_EWSR_OUTSIZE] = { JEDEC_EWSR };
+
+	/* Send EWSR (Enable Write Status Register). */
+	return spi_command(JEDEC_EWSR_OUTSIZE, JEDEC_EWSR_INSIZE, cmd, NULL);
+}
+
 /*
  * This is according the SST25VF016 datasheet, who knows it is more
  * generic that this...
@@ -500,9 +517,9 @@ int spi_disable_blockprotect(void)
 	/* If there is block protection in effect, unprotect it first. */
 	if ((status & 0x3c) != 0) {
 		printf_debug("Some block protection in effect, disabling\n");
-		result = spi_write_enable();
+		result = spi_write_status_enable();
 		if (result) {
-			printf_debug("spi_write_enable failed\n");
+			printf_debug("spi_write_status_enable failed\n");
 			return result;
 		}
 		result = spi_write_status_register(status & ~0x3c);
@@ -532,6 +549,8 @@ int spi_chip_read(struct flashchip *flash, uint8_t *buf)
 	switch (flashbus) {
 	case BUS_TYPE_IT87XX_SPI:
 		return it8716f_spi_chip_read(flash, buf);
+	case BUS_TYPE_SB600_SPI:
+		return sb600_spi_read(flash, buf);
 	case BUS_TYPE_ICH7_SPI:
 	case BUS_TYPE_ICH9_SPI:
 	case BUS_TYPE_VIA_SPI:
@@ -550,6 +569,8 @@ int spi_chip_write(struct flashchip *flash, uint8_t *buf)
 	switch (flashbus) {
 	case BUS_TYPE_IT87XX_SPI:
 		return it8716f_spi_chip_write(flash, buf);
+	case BUS_TYPE_SB600_SPI:
+		return sb600_spi_write(flash, buf);
 	case BUS_TYPE_ICH7_SPI:
 	case BUS_TYPE_ICH9_SPI:
 	case BUS_TYPE_VIA_SPI:
diff --git a/spi.h b/spi.h
index c096dce..25ce297 100644
--- a/spi.h
+++ b/spi.h
@@ -80,6 +80,11 @@
 #define JEDEC_RDSR_INSIZE	0x01
 #define JEDEC_RDSR_BIT_WIP	(0x01 << 0)
 
+/* Write Status Enable */
+#define JEDEC_EWSR		0x50
+#define JEDEC_EWSR_OUTSIZE	0x01
+#define JEDEC_EWSR_INSIZE	0x00
+
 /* Write Status Register */
 #define JEDEC_WRSR		0x01
 #define JEDEC_WRSR_OUTSIZE	0x02