Patchwork Bitbanging SPI driver

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Submitter Carl-Daniel Hailfinger
Date 2009-08-12 17:05:17
Message ID <4A82F64D.5050900@gmx.net>
Download mbox | patch
Permalink /patch/113/
State Superseded
Headers show

Comments

Carl-Daniel Hailfinger - 2009-08-12 17:05:17
This is a bitbanging SPI driver without hardware support. If you want
support for a particular piece of hardware, just fill in a few
functions. That's it.

Tested, trace looks OK.

Not 0.9.1 material. If I get an ack, I'll commit after 0.9.1.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

Patch

Index: flashrom-bitbang_spi/flash.h
===================================================================
--- flashrom-bitbang_spi/flash.h	(Revision 682)
+++ flashrom-bitbang_spi/flash.h	(Arbeitskopie)
@@ -90,6 +90,7 @@ 
 #if SERPROG_SUPPORT == 1
 	PROGRAMMER_SERPROG,
 #endif
+	PROGRAMMER_BITBANGSPI,
 	PROGRAMMER_INVALID /* This must always be the last entry. */
 };
 
@@ -390,6 +391,12 @@ 
 int ft2232_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len);
 int ft2232_spi_write_256(struct flashchip *flash, uint8_t *buf);
 
+/* bitbang_spi.c */
+int bitbang_spi_init(void);
+int bitbang_spi_send_command(unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr);
+int bitbang_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len);
+int bitbang_spi_write_256(struct flashchip *flash, uint8_t *buf);
+
 /* flashrom.c */
 extern char *programmer_param;
 extern int verbose;
@@ -428,6 +435,7 @@ 
 	SPI_CONTROLLER_WBSIO,
 	SPI_CONTROLLER_FT2232,
 	SPI_CONTROLLER_DUMMY,
+	SPI_CONTROLLER_BITBANG,
 };
 struct spi_command {
 	unsigned int writecnt;
Index: flashrom-bitbang_spi/bitbang_spi.c
===================================================================
--- flashrom-bitbang_spi/bitbang_spi.c	(Revision 0)
+++ flashrom-bitbang_spi/bitbang_spi.c	(Revision 0)
@@ -0,0 +1,183 @@ 
+/*
+ * 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"
+
+#if BITBANG_SPI_SUPPORT == 1
+
+/* Length of half a clock period in usecs */
+int bitbang_half_period = 0;
+
+/* Empty functions, need to be replaced with actual driver implementation. */
+void bitbang_set_cs(int val)
+{
+}
+
+void bitbang_set_sck(int val)
+{
+}
+
+void bitbang_set_mosi(int val)
+{
+}
+
+int bitbang_get_miso(void)
+{
+	return 1;
+}
+
+int bitbang_spi_init(void)
+{
+	bitbang_set_cs(1);
+	bitbang_set_sck(0);
+
+	buses_supported = CHIP_BUSTYPE_SPI;
+	spi_controller = SPI_CONTROLLER_BITBANG;
+
+	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;
+}
+
+#else
+int bitbang_spi_init(void)
+{
+	fprintf(stderr, "Bitbanging SPI support was not compiled in\n");
+	exit(1);
+}
+
+int bitbang_spi_send_command(unsigned int writecnt, unsigned int readcnt,
+		const unsigned char *writearr, unsigned char *readarr)
+{
+	fprintf(stderr, "Bitbanging SPI support was not compiled in\n");
+	exit(1);
+}
+
+int bitbang_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len)
+{
+	fprintf(stderr, "Bitbanging SPI support was not compiled in\n");
+	exit(1);
+}
+
+int bitbang_spi_write_256(struct flashchip *flash, uint8_t *buf)
+{
+	fprintf(stderr, "Bitbanging SPI support was not compiled in\n");
+	exit(1);
+}
+#endif
Index: flashrom-bitbang_spi/spi.c
===================================================================
--- flashrom-bitbang_spi/spi.c	(Revision 682)
+++ flashrom-bitbang_spi/spi.c	(Arbeitskopie)
@@ -95,6 +95,13 @@ 
 		.read = NULL,
 		.write_256 = NULL,
 	},
+
+	{ /* SPI_CONTROLLER_BITBANG */
+		.command = bitbang_spi_send_command,
+		.multicommand = default_spi_send_multicommand,
+		.read = bitbang_spi_read,
+		.write_256 = bitbang_spi_write_256,
+	},
 };
 
 
Index: flashrom-bitbang_spi/Makefile
===================================================================
--- flashrom-bitbang_spi/Makefile	(Revision 682)
+++ flashrom-bitbang_spi/Makefile	(Arbeitskopie)
@@ -67,11 +67,19 @@ 
 # Always enable serprog for now. Needs to be disabled on Windows.
 CONFIG_SERPROG = yes
 
+# Bitbanging SPI is not yet ready.
+CONFIG_BITBANG_SPI = yes
+
 ifeq ($(CONFIG_SERPROG), yes)
 FEATURE_CFLAGS += -D'SERPROG_SUPPORT=1'
 OBJS += serprog.o
 endif
 
+ifeq ($(CONFIG_BITBANG_SPI), yes)
+FEATURE_CFLAGS += -D'BITBANG_SPI_SUPPORT=1'
+OBJS += bitbang_spi.o
+endif
+
 FEATURE_CFLAGS += $(shell LC_ALL=C grep -q "FTDISUPPORT := yes" .features && printf "%s" "-D'FT2232_SPI_SUPPORT=1'")
 
 FEATURE_LIBS += $(shell LC_ALL=C grep -q "FTDISUPPORT := yes" .features && printf "%s" "-lftdi")
Index: flashrom-bitbang_spi/flashrom.c
===================================================================
--- flashrom-bitbang_spi/flashrom.c	(Revision 682)
+++ flashrom-bitbang_spi/flashrom.c	(Arbeitskopie)
@@ -158,6 +158,23 @@ 
 	},
 #endif
 
+	{
+		.name			= "bitbangspi",
+		.init			= bitbang_spi_init,
+		.shutdown		= fallback_shutdown,
+		.map_flash_region	= fallback_map,
+		.unmap_flash_region	= fallback_unmap,
+		.chip_readb		= dummy_chip_readb,
+		.chip_readw		= fallback_chip_readw,
+		.chip_readl		= fallback_chip_readl,
+		.chip_readn		= fallback_chip_readn,
+		.chip_writeb		= fallback_chip_writeb,
+		.chip_writew		= fallback_chip_writew,
+		.chip_writel		= fallback_chip_writel,
+		.chip_writen		= fallback_chip_writen,
+		.delay			= internal_delay,
+	},
+
 	{}, /* This entry corresponds to PROGRAMMER_INVALID. */
 };
 
@@ -512,7 +529,7 @@ 
 	     "   -z | --list-supported-wiki:       print supported devices in wiki syntax\n"
 	     "   -p | --programmer <name>:         specify the programmer device\n"
 	     "                                     (internal, dummy, nic3com, satasii,\n"
-	     "                                     it87spi, ft2232spi, serprog)\n"
+	     "                                     it87spi, ft2232spi, serprog, bitbangspi)\n"
 	     "   -h | --help:                      print this help text\n"
 	     "   -R | --version:                   print the version (release)\n"
 	     "\nYou can specify one of -E, -r, -w, -v or no operation. If no operation is\n"