flashrom: Winbond SuperIO SPI driver.

Developed and tested to work on Intel D201GLY in July 2008.
Tested by a helpful person on IRC whose name I've since forgotten. Sorry!

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Ward Vandewege <ward@gnu.org>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3910 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 201 insertions, 0 deletions

diff --git a/util/flashrom/wbsio_spi.c b/util/flashrom/wbsio_spi.c
new file mode 100644
index 0000000000..5ad945549d
--- /dev/null
+++ b/util/flashrom/wbsio_spi.c
@@ -0,0 +1,201 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2008 Peter Stuge <peter@stuge.se>
+ *
+ * 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; version 2 of the License.
+ *
+ * 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 <pci/pci.h>
+#include <stdint.h>
+#include <string.h>
+#include "flash.h"
+#include "spi.h"
+
+#define WBSIO_PORT1	0x2e
+#define WBSIO_PORT2	0x4e
+
+static uint16_t wbsio_spibase = 0;
+
+static uint16_t wbsio_get_spibase(uint16_t port) {
+	uint8_t id;
+	uint16_t flashport = 0;
+
+	w836xx_ext_enter(port);
+	id = wbsio_read(port, 0x20);
+	if(id != 0xa0) {
+		fprintf(stderr, "\nW83627 not found at 0x%x, id=0x%02x want=0xa0.\n", port, id);
+		goto done;
+	}
+
+	if (0 == (wbsio_read(port, 0x24) & 2)) {
+		fprintf(stderr, "\nW83627 found at 0x%x, but SPI pins are not enabled. (CR[0x24] bit 1=0)\n", port);
+		goto done;
+	}
+
+	wbsio_write(port, 0x07, 0x06);
+	if (0 == (wbsio_read(port, 0x30) & 1)) {
+		fprintf(stderr, "\nW83627 found at 0x%x, but SPI is not enabled. (LDN6[0x30] bit 0=0)\n", port);
+		goto done;
+	}
+
+	flashport = (wbsio_read(port, 0x62) << 8) | wbsio_read(port, 0x63);
+
+done:
+	w836xx_ext_leave(port);
+	return flashport;
+}
+
+int wbsio_check_for_spi(const char *name) {
+	if (0 == (wbsio_spibase = wbsio_get_spibase(WBSIO_PORT1)))
+		if (0 == (wbsio_spibase = wbsio_get_spibase(WBSIO_PORT2)))
+			return 1;
+
+	printf_debug("\nwbsio_spibase = 0x%x\n", wbsio_spibase);
+	flashbus = BUS_TYPE_WBSIO_SPI;
+	return 0;
+}
+
+/* W83627DHG has 11 command modes:
+ * 1=1 command only
+ * 2=1 command+1 data write
+ * 3=1 command+2 data read
+ * 4=1 command+3 address
+ * 5=1 command+3 address+1 data write
+ * 6=1 command+3 address+4 data write
+ * 7=1 command+3 address+1 dummy address inserted by wbsio+4 data read
+ * 8=1 command+3 address+1 data read
+ * 9=1 command+3 address+2 data read
+ * a=1 command+3 address+3 data read
+ * b=1 command+3 address+4 data read
+ *
+ * mode[7:4] holds the command mode
+ * mode[3:0] holds SPI address bits [19:16]
+ *
+ * The Winbond SPI master only supports 20 bit addresses on the SPI bus. :\
+ * Would one more byte of RAM in the chip (to get all 24 bits) really make
+ * such a big difference?
+ */
+int wbsio_spi_command(unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr) {
+	int i;
+	uint8_t mode = 0;
+
+	printf_debug("%s:", __func__);
+
+	if (1 == writecnt && 0 == readcnt) {
+		mode = 0x10;
+	} else if (2 == writecnt && 0 == readcnt) {
+		OUTB(writearr[1], wbsio_spibase + 4);
+		printf_debug(" data=0x%02x", writearr[1]);
+		mode = 0x20;
+	} else if (1 == writecnt && 2 == readcnt) {
+		mode = 0x30;
+	} else if (4 == writecnt && 0 == readcnt) {
+		printf_debug(" addr=0x%02x", (writearr[1] & 0x0f));
+		for (i = 2; i < writecnt; i++) {
+			OUTB(writearr[i], wbsio_spibase + i);
+			printf_debug("%02x", writearr[i]);
+		}
+		mode = 0x40 | (writearr[1] & 0x0f);
+	} else if (5 == writecnt && 0 == readcnt) {
+		printf_debug(" addr=0x%02x", (writearr[1] & 0x0f));
+		for (i = 2; i < 4; i++) {
+			OUTB(writearr[i], wbsio_spibase + i);
+			printf_debug("%02x", writearr[i]);
+		}
+		OUTB(writearr[i], wbsio_spibase + i);
+		printf_debug(" data=0x%02x", writearr[i]);
+		mode = 0x50 | (writearr[1] & 0x0f);
+	} else if (8 == writecnt && 0 == readcnt) {
+		printf_debug(" addr=0x%02x", (writearr[1] & 0x0f));
+		for (i = 2; i < 4; i++) {
+			OUTB(writearr[i], wbsio_spibase + i);
+			printf_debug("%02x", writearr[i]);
+		}
+		printf_debug(" data=0x");
+		for (; i < writecnt; i++) {
+			OUTB(writearr[i], wbsio_spibase + i);
+			printf_debug("%02x", writearr[i]);
+		}
+		mode = 0x60 | (writearr[1] & 0x0f);
+	} else if (5 == writecnt && 4 == readcnt) {
+		/* XXX: TODO not supported by flashrom infrastructure!
+		 * This mode, 7, discards the fifth byte in writecnt,
+		 * but since we can not express that in flashrom, fail
+		 * the operation for now.
+		 */
+		;
+	} else if (4 == writecnt && readcnt >= 1 && readcnt <= 4) {
+		printf_debug(" addr=0x%02x", (writearr[1] & 0x0f));
+		for (i = 2; i < writecnt; i++) {
+			OUTB(writearr[i], wbsio_spibase + i);
+			printf_debug("%02x", writearr[i]);
+		}
+		mode = ((7 + readcnt) << 4) | (writearr[1] & 0x0f);
+	}
+	printf_debug(" cmd=%02x mode=%02x\n", writearr[0], mode);
+
+	if (!mode) {
+		fprintf(stderr, "%s: unsupported command type wr=%d rd=%d\n",
+			__func__, writecnt, readcnt);
+		return 1;
+	}
+
+	OUTB(writearr[0], wbsio_spibase);
+	OUTB(mode, wbsio_spibase + 1);
+	myusec_delay(10);
+
+	if (!readcnt)
+		return 0;
+
+	printf_debug("%s: returning data =", __func__);
+	for (i = 0; i < readcnt; i++) {
+		readarr[i] = INB(wbsio_spibase + 4 + i);
+		printf_debug(" 0x%02x", readarr[i]);
+	}
+	printf_debug("\n");
+	return 0;
+}
+
+int wbsio_spi_read(struct flashchip *flash, uint8_t *buf) {
+	int size = flash->total_size * 1024;
+
+	if (flash->total_size > 1024) {
+		fprintf(stderr, "%s: Winbond saved on 4 register bits so max chip size is 1024 KB!\n", __func__);
+		return 1;
+	}
+
+	memcpy(buf, (const char *)flash->virtual_memory, size);
+	return 0;
+}
+
+int wbsio_spi_write(struct flashchip *flash, uint8_t *buf) {
+	int pos, size = flash->total_size * 1024;
+
+	if (flash->total_size > 1024) {
+		fprintf(stderr, "%s: Winbond saved on 4 register bits so max chip size is 1024 KB!\n", __func__);
+		return 1;
+	}
+
+	flash->erase(flash);
+	spi_write_enable();
+	for (pos = 0; pos < size; pos++) {
+		spi_byte_program(pos, buf[pos]);
+		while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
+			myusec_delay(10);
+	}
+	spi_write_disable();
+	return 0;
+}