[coreboot] [PATCH] flashrom: Add dummy SPI controller support

[Carl-Daniel Hailfinger]

Add a dummy SPI controller driver, similar to the dummy LPC/FWH/Parallel
flasher driver.
Does not support reading or writing the fake chip yet.

flashrom --programmer dummy
also enables the dummy SPI controller driver.

Testing the dummy SPI driver revealed a RDID debug printing bug in the
SPI core. Fix that as well.

Signed-off-by: Carl-Daniel Hailfinger

Index: flashrom-dummy_spi/flash.h
===================================================================
--- flashrom-dummy_spi/flash.h	(Revision 495)
+++ flashrom-dummy_spi/flash.h	(Arbeitskopie)
@@ -569,7 +569,8 @@
    BUS_TYPE_IT87XX_SPI,
    BUS_TYPE_SB600_SPI,
    BUS_TYPE_VIA_SPI,
-	BUS_TYPE_WBSIO_SPI
+	BUS_TYPE_WBSIO_SPI,
+	BUS_TYPE_DUMMY_SPI
 } flashbus_t;

extern flashbus_t flashbus;
@@ -600,6 +601,8 @@
 uint8_t dummy_chip_readb(const volatile void *addr);
 uint16_t dummy_chip_readw(const volatile void *addr);
 uint32_t dummy_chip_readl(const volatile void *addr);
+int dummy_spi_command(unsigned int writecnt, unsigned int readcnt,
+		      const unsigned char *writearr, unsigned char *readarr);

/* flashrom.c */
 extern int verbose;
Index: flashrom-dummy_spi/spi.c
===================================================================
--- flashrom-dummy_spi/spi.c	(Revision 495)
+++ flashrom-dummy_spi/spi.c	(Arbeitskopie)
@@ -46,6 +46,8 @@
    	return sb600_spi_command(writecnt, readcnt, writearr, readarr);
    case BUS_TYPE_WBSIO_SPI:
    	return wbsio_spi_command(writecnt, readcnt, writearr, readarr);
+	case BUS_TYPE_DUMMY_SPI:
+		return dummy_spi_command(writecnt, readcnt, writearr, readarr);
    default:
    	printf_debug
    	    ("%s called, but no SPI chipset/strapping detected\n",
@@ -57,11 +59,14 @@
 static int spi_rdid(unsigned char *readarr, int bytes)
 {
    const unsigned char cmd[JEDEC_RDID_OUTSIZE] = { JEDEC_RDID };
+	int i;

if (spi_command(sizeof(cmd), bytes, cmd, readarr))
    	return 1;
-	printf_debug("RDID returned %02x %02x %02x.\n", readarr[0], readarr[1],
-		     readarr[2]);
+	printf_debug("RDID returned");
+	for (i = 0; i < bytes; i++)
+		printf_debug(" 0x%02x", readarr[i]);
+	printf_debug("\n");
    return 0;
 }

@@ -178,6 +183,7 @@
    case BUS_TYPE_VIA_SPI:
    case BUS_TYPE_SB600_SPI:
    case BUS_TYPE_WBSIO_SPI:
+	case BUS_TYPE_DUMMY_SPI:
    	return probe_spi_rdid_generic(flash, 4);
    default:
    	printf_debug("4b ID not supported on this SPI controller\n");
Index: flashrom-dummy_spi/dummyflasher.c
===================================================================
--- flashrom-dummy_spi/dummyflasher.c	(Revision 495)
+++ flashrom-dummy_spi/dummyflasher.c	(Arbeitskopie)
@@ -31,6 +31,7 @@
 int dummy_init(void)
 {
    printf_debug("%s\n", __func__);
+	flashbus = BUS_TYPE_DUMMY_SPI;
    return 0; 
 }

@@ -86,3 +87,23 @@
    return 0xffffffff;
 }

+int dummy_spi_command(unsigned int writecnt, unsigned int readcnt,
+		      const unsigned char *writearr, unsigned char *readarr)
+{
+	int i;
+
+	printf_debug("%s:", __func__);
+
+	printf_debug(" writing %u bytes:", writecnt);
+	for (i = 0; i < writecnt; i++)
+		printf_debug(" 0x%02x", writearr[i]);
+
+	printf_debug(" reading %u bytes:", readcnt);
+	for (i = 0; i < readcnt; i++) {
+		printf_debug(" 0xff");
+		readarr[i] = 0xff;
+	}
+
+	printf_debug("\n");
+	return 0;
+}