powerpc/44x: Support OCM(On Chip Memory) for APM821xx SoC and Bluestone board

This patch consists of:
- Add driver for OCM component
- Export OCM Information at /sys/kernel/debug/ppc4xx_ocm/info

Signed-off-by: Vinh Nguyen Huu Tuong <vhtnguyen@apm.com>
Acked-by: Josh Boyer <jwboyer@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/ppc4xx_ocm.h

@@ -0,0 +1,45 @@
+/*
+ * PowerPC 4xx OCM memory allocation support
+ *
+ * (C) Copyright 2009, Applied Micro Circuits Corporation
+ * Victor Gallardo (vgallardo@amcc.com)
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __ASM_POWERPC_PPC4XX_OCM_H__
+#define __ASM_POWERPC_PPC4XX_OCM_H__
+
+#define PPC4XX_OCM_NON_CACHED 0
+#define PPC4XX_OCM_CACHED     1
+
+#if defined(CONFIG_PPC4xx_OCM)
+
+void *ppc4xx_ocm_alloc(phys_addr_t *phys, int size, int align,
+		  int flags, const char *owner);
+void ppc4xx_ocm_free(const void *virt);
+
+#else
+
+#define ppc4xx_ocm_alloc(phys, size, align, flags, owner)	NULL
+#define ppc4xx_ocm_free(addr)	((void)0)
+
+#endif /* CONFIG_PPC4xx_OCM */
+
+#endif  /* __ASM_POWERPC_PPC4XX_OCM_H__ */