This is the bitbanging SPI driver infrastructure
If you want support for a particular piece of hardware, just fill in
a few functions in spi_bitbang_master_table. That's it.
On top of this, the RayeR SPI flasher should be supportable in ~20 LOC.
Tested, trace looks OK.
Corresponding to flashrom svn r736.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
diff --git a/bitbang_spi.c b/bitbang_spi.c
new file mode 100644
index 0000000..882d129
--- /dev/null
+++ b/bitbang_spi.c
@@ -0,0 +1,161 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2009 Carl-Daniel Hailfinger
+ *
+ * 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 <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include "flash.h"
+#include "spi.h"
+
+/* Length of half a clock period in usecs */
+int bitbang_half_period = 0;
+
+enum spi_bitbang_master spi_bitbang_master = SPI_BITBANG_INVALID;
+
+const struct spi_bitbang_master_entry spi_bitbang_master_table[] = {
+ {}, /* This entry corresponds to SPI_BITBANG_INVALID. */
+};
+
+const int spi_bitbang_master_count = ARRAY_SIZE(spi_bitbang_master_table);
+
+void bitbang_set_cs(int val)
+{
+ spi_bitbang_master_table[spi_bitbang_master].set_cs(val);
+}
+
+void bitbang_set_sck(int val)
+{
+ spi_bitbang_master_table[spi_bitbang_master].set_sck(val);
+}
+
+void bitbang_set_mosi(int val)
+{
+ spi_bitbang_master_table[spi_bitbang_master].set_mosi(val);
+}
+
+int bitbang_get_miso(void)
+{
+ return spi_bitbang_master_table[spi_bitbang_master].get_miso();
+}
+
+int bitbang_spi_init(void)
+{
+ bitbang_set_cs(1);
+ bitbang_set_sck(0);
+ buses_supported = CHIP_BUSTYPE_SPI;
+ return 0;
+}
+
+uint8_t bitbang_spi_readwrite_byte(uint8_t val)
+{
+ uint8_t ret = 0;
+ int i;
+
+ for (i = 7; i >= 0; i--) {
+ bitbang_set_mosi((val >> i) & 1);
+ programmer_delay(bitbang_half_period);
+ bitbang_set_sck(1);
+ ret <<= 1;
+ ret |= bitbang_get_miso();
+ programmer_delay(bitbang_half_period);
+ bitbang_set_sck(0);
+ }
+ return ret;
+}
+
+int bitbang_spi_send_command(unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr, unsigned char *readarr)
+{
+ static unsigned char *bufout = NULL;
+ static unsigned char *bufin = NULL;
+ static int oldbufsize = 0;
+ int bufsize = max(writecnt + readcnt, 260);
+ int i;
+
+ /* Arbitrary size limitation here. We're only constrained by memory. */
+ if (writecnt > 65536 || readcnt > 65536)
+ return SPI_INVALID_LENGTH;
+
+ if (bufsize != oldbufsize) {
+ bufout = realloc(bufout, bufsize);
+ if (!bufout) {
+ fprintf(stderr, "Out of memory!\n");
+ if (bufin)
+ free(bufin);
+ exit(1);
+ }
+ bufin = realloc(bufout, bufsize);
+ if (!bufin) {
+ fprintf(stderr, "Out of memory!\n");
+ if (bufout)
+ free(bufout);
+ exit(1);
+ }
+ }
+
+ memcpy(bufout, writearr, writecnt);
+ /* Shift out 0x00 while reading data. */
+ memset(bufout + writecnt, 0x00, readcnt);
+ /* Make sure any non-read data is 0xff. */
+ memset(bufin + writecnt, 0xff, readcnt);
+
+ bitbang_set_cs(0);
+ for (i = 0; i < readcnt + writecnt; i++) {
+ bufin[i] = bitbang_spi_readwrite_byte(bufout[i]);
+ }
+ programmer_delay(bitbang_half_period);
+ bitbang_set_cs(1);
+ programmer_delay(bitbang_half_period);
+ memcpy(readarr, bufin + writecnt, readcnt);
+
+ return 0;
+}
+
+int bitbang_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len)
+{
+ /* Maximum read length is unlimited, use 64k bytes. */
+ return spi_read_chunked(flash, buf, start, len, 64 * 1024);
+}
+
+int bitbang_spi_write_256(struct flashchip *flash, uint8_t *buf)
+{
+ int total_size = 1024 * flash->total_size;
+ int i;
+
+ printf_debug("total_size is %d\n", total_size);
+ for (i = 0; i < total_size; i += 256) {
+ int l, r;
+ if (i + 256 <= total_size)
+ l = 256;
+ else
+ l = total_size - i;
+
+ if ((r = spi_nbyte_program(i, &buf[i], l))) {
+ fprintf(stderr, "%s: write fail %d\n", __FUNCTION__, r);
+ return 1;
+ }
+
+ while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
+ /* loop */;
+ }
+
+ return 0;
+}