i.MX27 CPU: Add basic i.MX27 CPU support

Add basic i.MX27 CPU support
Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>

arch/arm/mach-mx2/Kconfig

 comment "MX2 family CPU support"
 	depends on ARCH_MX2
 
+config MACH_MX27
+	bool "i.MX27 support"
+	depends on ARCH_MX2
+	help
+	  This enables support for Freescale's MX2 based i.MX27 processor.
+
 comment "MX2 Platforms"
 	depends on ARCH_MX2

arch/arm/mach-mx2/Makefile

@@ -5,3 +5,5 @@
 # Object file lists.
 
 obj-y	:=  system.o generic.o devices.o serial.o
+
+obj-$(CONFIG_MACH_MX27) += cpu_imx27.o

arch/arm/mach-mx2/cpu_imx27.c

+/*
+ * Copyright 2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
+ *
+ * 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; either version 2
+ * of the License, or (at your option) any later version.
+ * 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 Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+/*
+ * i.MX27 specific CPU detection code
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+
+#include <asm/hardware.h>
+
+#include "crm_regs.h"
+
+static int cpu_silicon_rev = -1;
+static int cpu_partnumber;
+
+static void query_silicon_parameter(void)
+{
+	u32 val;
+	/*
+	 * now we have access to the IO registers. As we need
+	 * the silicon revision very early we read it here to
+	 * avoid any further hooks
+	*/
+	val = __raw_readl(IO_ADDRESS(SYSCTRL_BASE_ADDR) + SYS_CHIP_ID);
+
+	cpu_silicon_rev = (int)(val >> 28);
+	cpu_partnumber = (int)((val >> 12) & 0xFFFF);
+}
+
+/*
+ * Returns:
+ *	the silicon revision of the cpu
+ *	-EINVAL - not a mx27
+ */
+int mx27_revision(void)
+{
+	if (cpu_silicon_rev == -1)
+		query_silicon_parameter();
+
+	if (cpu_partnumber != 0x8821)
+		return -EINVAL;
+
+	return cpu_silicon_rev;
+}
+EXPORT_SYMBOL(mx27_revision);

include/asm-arm/arch-mxc/hardware.h

@@ -27,6 +27,9 @@
 #endif
 
 #ifdef CONFIG_ARCH_MX2
+# ifdef CONFIG_MACH_MX27
+#  include <asm/arch/mx27.h>
+# endif
 #endif
 
 #include <asm/arch/mxc.h>

include/asm-arm/arch-mxc/mxc.h

@@ -29,4 +29,8 @@
 # define cpu_is_mx31() (0)
 #endif
 
+#ifndef CONFIG_MACH_MX27
+# define cpu_is_mx27() (0)
+#endif
+
 #endif /*  __ASM_ARCH_MXC_H__ */