Initial Contribution
msm-2.6.38: tag AU_LINUX_ANDROID_GINGERBREAD.02.03.04.00.142
Signed-off-by: Bryan Huntsman <bryanh@codeaurora.org>
diff --git a/include/linux/vcm_mm.h b/include/linux/vcm_mm.h
new file mode 100644
index 0000000..4cc5358
--- /dev/null
+++ b/include/linux/vcm_mm.h
@@ -0,0 +1,105 @@
+/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ */
+
+/* Architecture-specific VCM functions */
+
+/* Device attributes */
+
+/*
+ * Sharing attributes. Pick only one.
+ */
+#define VCM_DEV_ATTR_NON_SH (0x00)
+#define VCM_DEV_ATTR_SH (0x04)
+
+/*
+ * Caching attributes. Pick only one.
+ */
+#define VCM_DEV_ATTR_NONCACHED (0x00)
+#define VCM_DEV_ATTR_CACHED_WB_WA (0x01)
+#define VCM_DEV_ATTR_CACHED_WB_NWA (0x02)
+#define VCM_DEV_ATTR_CACHED_WT (0x03)
+
+/*
+ * A "good" default set of attributes: shareable and non-cacheable.
+ */
+#define VCM_DEV_DEFAULT_ATTR (VCM_DEV_ATTR_SH | VCM_DEV_ATTR_NONCACHED)
+
+/**
+ * set_arm7_pte_attr() - Set ARMv7 page table attributes
+ * pt_base Virtual address of the first-level page table
+ * @va Virtual address whose attributes are to be set
+ * @len Page size used to map the given virtual address
+ * @attr Attributes to set for this mapping.
+ *
+ * Modify a mapping attribute. The base address of the page table must
+ * be a virtual address containing a valid ARMv7 page table. The
+ * virtual address must refer to an existing mapping and must be
+ * aligned to the length with which it was mapped. The mapping length
+ * must similarly be the same as was specified when the mapping was
+ * made (one of 4KB, 64KB, 1MB, or 16MB). The attribute must be one of
+ * the shareability attributes above ORed with one of the cacheability
+ * attributes. Any previous attributes are completely replaced by the
+ * most recent call to this function. This function only sets the
+ * cacheability and shareability attributes. This is accomplished by
+ * modifying the TEX class and the S bit in the PTE. It is an error to
+ * call this function without having called vcm_setup_tex_classes at
+ * least once.
+ *
+ * The return value is zero on success and non-zero on failure.
+ */
+int set_arm7_pte_attr(unsigned long pt_base, unsigned long va,
+ unsigned long len, unsigned int attr);
+
+
+/**
+ * cpu_set_attr() - Set page table attributes on the CPU's page tables
+ * @va Virtual address whose attributes are to be set
+ * @len Page size used to map the given virtual address
+ * @attr Attributes to set for this mapping.
+ *
+ * Modify a mapping attribute within the ARM page tables. The va must
+ * refer to an existing mapping and must be aligned to the length with
+ * which it was mapped. The mapping length must similarly be the same
+ * as was specified when the mapping was made (one of 4KB, 64KB, 1MB,
+ * or 16MB). The attribute must be one of the shareability attributes
+ * above ORed with one of the cacheability attributes. Any previous
+ * attributes are completely replaced by the most recent call to this
+ * function. This function only sets the cacheability and shareability
+ * attributes. This is accomplished by modifying the TEX class and the
+ * S bit in the PTE. It is an error to call this function without
+ * having called vcm_setup_tex_classes at least once. It is an error
+ * to call this function on any system using a memory configuration
+ * that is anything OTHER than ARMv7 with TEX remap enabled. Only the
+ * HW page tables are modified; the Linux page tables are left
+ * untouched.
+ *
+ * The return value is zero on success and non-zero on failure.
+ */
+int cpu_set_attr(unsigned long va, unsigned long len, unsigned int attr);
+
+
+/**
+ * vcm_setup_tex_classes() - Prepare TEX class table for use
+ *
+ * Initialize the attribute mapping table by examining the TEX classes
+ * used by the CPU and finding the classes that match the device
+ * attributes (VCM_DEV_xx) defined above. This function is only
+ * relevant if TEX remap is enabled. The results will be unpredictable
+ * and irrelevant if TEX remap is not in use. It is an error to call
+ * this function in any system using a memory configuration of
+ * anything OTHER than ARMv7 with TEX remap enabled.
+ *
+ * The return value is zero on success or non-zero on failure. In the
+ * present version, a failure will result in a panic.
+ */
+int vcm_setup_tex_classes(void);