sh: SH-4A Privileged Space Mapping Buffer (PMB) support.

Add support for 32-bit physical addressing through the SH-4A
Privileged Space Mapping Buffer (PMB).

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 47 insertions, 1 deletions

diff --git a/include/asm-sh/mmu.h b/include/asm-sh/mmu.h
index 72f07be..91c8846 100644
--- a/include/asm-sh/mmu.h
+++ b/include/asm-sh/mmu.h
@@ -25,5 +25,51 @@ typedef struct {
 typedef unsigned long mm_context_t;
 
 #endif /* CONFIG_MMU */
-#endif /* __MMH_H */
+
+/*
+ * Privileged Space Mapping Buffer (PMB) definitions
+ */
+#define PMB_PASCR		0xff000070
+#define PMB_IRMCR		0xff000078
+
+#define PMB_ADDR		0xf6100000
+#define PMB_DATA		0xf7100000
+#define PMB_ENTRY_MAX		16
+#define PMB_E_MASK		0x0000000f
+#define PMB_E_SHIFT		8
+
+#define PMB_SZ_16M		0x00000000
+#define PMB_SZ_64M		0x00000010
+#define PMB_SZ_128M		0x00000080
+#define PMB_SZ_512M		0x00000090
+#define PMB_SZ_MASK		PMB_SZ_512M
+#define PMB_C			0x00000008
+#define PMB_WT			0x00000001
+#define PMB_UB			0x00000200
+#define PMB_V			0x00000100
+
+#define PMB_NO_ENTRY		(-1)
+
+struct pmb_entry {
+	unsigned long vpn;
+	unsigned long ppn;
+	unsigned long flags;
+
+	/*
+	 * 0 .. NR_PMB_ENTRIES for specific entry selection, or
+	 * PMB_NO_ENTRY to search for a free one
+	 */
+	int entry;
+};
+
+/* arch/sh/mm/pmb.c */
+int __set_pmb_entry(unsigned long vpn, unsigned long ppn,
+		    unsigned long flags, int *entry);
+void set_pmb_entry(struct pmb_entry *pmbe);
+void clear_pmb_entry(struct pmb_entry *pmbe);
+struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
+			    unsigned long flags);
+void pmb_free(struct pmb_entry *pmbe);
+
+#endif /* __MMU_H */