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.

Corresponding to flashrom svn r507.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

dummyflasher.c

@@ -31,6 +31,7 @@
 int dummy_init(void)
 {
 	printf_debug("%s\n", __func__);
+	flashbus = BUS_TYPE_DUMMY_SPI;
 	return 0; 
 }
 
@@ -86,3 +87,23 @@ uint32_t dummy_chip_readl(const volatile void *addr)
 	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;
+}

flash.h

@@ -571,7 +571,8 @@ typedef enum {
 	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;
@@ -602,6 +603,8 @@ void dummy_chip_writel(uint32_t val, volatile void *addr);
 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);
 
 /* nic3com.c */
 int nic3com_init(void);

spi.c

@@ -46,6 +46,8 @@ int spi_command(unsigned int writecnt, unsigned int readcnt,
 		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",
@@ -58,12 +60,15 @@ static int spi_rdid(unsigned char *readarr, int bytes)
 {
 	const unsigned char cmd[JEDEC_RDID_OUTSIZE] = { JEDEC_RDID };
 	int ret;
+	int i;
 
 	ret = spi_command(sizeof(cmd), bytes, cmd, readarr);
 	if (ret)
 		return ret;
-	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;
 }
 
@@ -202,6 +207,7 @@ int probe_spi_rdid4(struct flashchip *flash)
 	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");