Internal: introduce processor enables and abort if top/bottom alignment is unknown

The internal programmer needs correct information about flash_base and
chip window top/bottom alignment on non-x86 before it can be used. Abort
any internal programmer action for now until the code is fixed.

Add the concept of a processor enable for systems where flashing is
impacted by processor settings or processor model.

Corresponding to flashrom svn r1031.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

Makefile

@@ -124,7 +124,7 @@ CONFIG_PRINT_WIKI ?= no
 
 ifeq ($(CONFIG_INTERNAL), yes)
 FEATURE_CFLAGS += -D'CONFIG_INTERNAL=1'
-PROGRAMMER_OBJS += chipset_enable.o board_enable.o cbtable.o dmi.o internal.o
+PROGRAMMER_OBJS += processor_enable.o chipset_enable.o board_enable.o cbtable.o dmi.o internal.o
 # FIXME: The PROGRAMMER_OBJS below should only be included on x86.
 PROGRAMMER_OBJS += it87spi.o ichspi.o sb600spi.o wbsio_spi.o
 NEED_PCI := yes

flash.h

@@ -361,6 +361,9 @@ int board_flash_enable(const char *vendor, const char *part);
 /* chipset_enable.c */
 int chipset_flash_enable(void);
 
+/* processor_enable.c */
+int processor_flash_enable(void);
+
 /* physmap.c */
 void *physmap(const char *descr, unsigned long phys_addr, size_t len);
 void *physmap_try_ro(const char *descr, unsigned long phys_addr, size_t len);

internal.c

@@ -165,16 +165,28 @@ int internal_init(void)
 	pci_init(pacc);		/* Initialize the PCI library */
 	pci_scan_bus(pacc);	/* We want to get the list of devices */
 
-	/* We look at the lbtable first to see if we need a
+	if (processor_flash_enable()) {
+		msg_perr("Processor detection/init failed.\n"
+			 "Aborting.\n");
+		return 1;
+	}
+
+#if defined(__i386__) || defined(__x86_64__)
+	/* We look at the cbtable first to see if we need a
 	 * mainboard specific flash enable sequence.
 	 */
 	coreboot_init();
 
-#if defined(__i386__) || defined(__x86_64__)
 	dmi_init();
 
 	/* Probe for the Super I/O chip and fill global struct superio. */
 	probe_superio();
+#else
+	/* FIXME: Enable cbtable searching on all non-x86 platforms supported
+	 *        by coreboot.
+	 * FIXME: Find a replacement for DMI on non-x86.
+	 * FIXME: Enable Super I/O probing once port I/O is possible.
+	 */
 #endif
 
 	/* Warn if a laptop is detected. */
@@ -200,6 +212,7 @@ int internal_init(void)
 		}
 	}
 
+#if __FLASHROM_LITTLE_ENDIAN__
 	/* try to enable it. Failure IS an option, since not all motherboards
 	 * really need this to be done, etc., etc.
 	 */
@@ -220,7 +233,26 @@ int internal_init(void)
 	 * The error code might have been a warning only.
 	 * Besides that, we don't check the board enable return code either.
 	 */
+#if defined(__i386__) || defined(__x86_64__)
 	return 0;
+#else
+	msg_perr("Your platform is not supported yet for the internal "
+		 "programmer due to missing\n"
+		 "flash_base and top/bottom alignment information.\n"
+		 "Aborting.\n");
+	return 1;
+#endif
+#else
+	/* FIXME: Remove this unconditional abort once all PCI drivers are
+	 * converted to use little-endian accesses for memory BARs.
+	 */
+	msg_perr("Your platform is not supported yet for the internal "
+		 "programmer because it has\n"
+		 "not been converted from native endian to little endian "
+		 "access yet.\n"
+		 "Aborting.\n");
+	return 1;
+#endif
 }
 
 int internal_shutdown(void)

processor_enable.c

+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2010 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
+ */
+
+/*
+ * Contains the processor specific flash enables and system settings.
+ */
+
+#include "flash.h"
+
+#if defined(__i386__) || defined(__x86_64__)
+
+int processor_flash_enable(void)
+{
+	/* On x86, flash access is not processor specific except on
+	 * AMD Elan SC520, AMD Geode and maybe other SoC-style CPUs.
+	 * FIXME: Move enable_flash_cs5536 and get_flashbase_sc520 here.
+	 */
+	return 0;
+}
+
+#else
+
+int processor_flash_enable(void)
+{
+	/* Not implemented yet. Oh well. */
+	return 1;
+}
+
+#endif