ppc4xx: Add variable "korat_usbcf" for Korat board

The new environment variable "korat_usbcf" selects the USB
port used by the Korat board's CompactFlash controller.

Signed-off-by: Larry Johnson <lrj@acm.org>
Signed-off-by: Stefan Roese <sr@denx.de>

board/korat/korat.c

@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2007-2008
+ * (C) Copyright 2007-2009
  * Larry Johnson, lrj@acm.org
  *
  * (C) Copyright 2006-2007
@@ -351,6 +351,7 @@ int misc_init_r(void)
 	unsigned long sdr0_pfc1;
 	uint32_t const flash1_size = gd->bd->bi_flashsize - CONFIG_SYS_FLASH0_SIZE;
 	char const *const act = getenv("usbact");
+	char const *const usbcf = getenv("korat_usbcf");
 
 	/*
 	 * Re-do FLASH1 sizing and adjust flash start and offset.
@@ -405,6 +406,26 @@ int misc_init_r(void)
 	/*
 	 * USB suff...
 	 */
+	/*
+	 * Select the USB controller on the 440EPx ("ppc") or on the PCI bus
+	 * ("pci") for the CompactFlash.
+	 */
+	if (usbcf != NULL && (strcmp(usbcf, "ppc") == 0)) {
+		/*
+		 * If environment variable "usbcf" is defined and set to "ppc",
+		 * then connect the CompactFlash controller to the PowerPC USB
+		 * port.
+		 */
+		printf("Attaching CompactFalsh controller to PPC USB\n");
+		out_8((u8 *) CONFIG_SYS_CPLD_BASE + 0x02,
+		      in_8((u8 *) CONFIG_SYS_CPLD_BASE + 0x02) | 0x10);
+	} else {
+		if (usbcf != NULL && (strcmp(usbcf, "pci") != 0))
+			printf("Warning: \"korat_usbcf\" is not set to a legal "
+			       "value (\"ppc\" or \"pci\")\n");
+
+		printf("Attaching CompactFalsh controller to PCI USB\n");
+	}
 	if (act == NULL || strcmp(act, "hostdev") == 0) {
 		/* SDR Setting */
 		mfsdr(SDR0_PFC1, sdr0_pfc1);

doc/README.korat

@@ -49,3 +49,17 @@ creates the upgradable U-Boot but selecting loader file "u-boot-F7FC.lds" and
 leaving preprocessor symbol "CONFIG_KORAT_PERMANENT" undefined.
 
 2008-02-22, Larry Johnson <lrj@acm.org>
+
+
+
+The CompactFlash(R) controller on the Korat board provides a hi-speed USB
+interface.  This may be connected to either a dedicated port on the on-board
+USB controller, or to a USB port on the PowerPC 440EPx processor.  The U-Boot
+environment variable "korat_usbcf" can be used to specify which of these two
+USB host ports is used for CompactFlash.  The valid setting for the variable are
+the strings "pci" and "ppc".  If the variable defined and set to "ppc", then the
+PowerPC USB port is used.  In all other cases the on-board USB controller is
+used, but if "korat_usbcf" is defined but is set to a string other than the two
+valid options, a warning is also issued.
+
+2009-01-28, Larry Johnson <lrj@acm.org>