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!
Corresponding to flashrom svn r404 and coreboot v2 svn r3910.
Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Ward Vandewege <ward@gnu.org>
diff --git a/wbsio_spi.c b/wbsio_spi.c
new file mode 100644
index 0000000..5ad9455
--- /dev/null
+++ b/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;
+}