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-rw-r--r--arch/m68k/include/asm/sun3mmu.h172
1 files changed, 172 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/sun3mmu.h b/arch/m68k/include/asm/sun3mmu.h
new file mode 100644
index 000000000..21a75daa2
--- /dev/null
+++ b/arch/m68k/include/asm/sun3mmu.h
@@ -0,0 +1,172 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Definitions for Sun3 custom MMU.
+ */
+#ifndef __SUN3_MMU_H__
+#define __SUN3_MMU_H__
+
+#include <linux/types.h>
+#include <asm/movs.h>
+#include <asm/sun3-head.h>
+
+/* MMU characteristics. */
+#define SUN3_SEGMAPS_PER_CONTEXT 2048
+#define SUN3_PMEGS_NUM 256
+#define SUN3_CONTEXTS_NUM 8
+
+#define SUN3_PMEG_SIZE_BITS 17
+#define SUN3_PMEG_SIZE (1 << SUN3_PMEG_SIZE_BITS)
+#define SUN3_PMEG_MASK (SUN3_PMEG_SIZE - 1)
+
+#define SUN3_PTE_SIZE_BITS 13
+#define SUN3_PTE_SIZE (1 << SUN3_PTE_SIZE_BITS)
+#define SUN3_PTE_MASK (SUN3_PTE_SIZE - 1)
+
+#define SUN3_CONTROL_MASK (0x0FFFFFFC)
+#define SUN3_INVALID_PMEG 255
+#define SUN3_INVALID_CONTEXT 255
+
+#define AC_IDPROM 0x00000000 /* 34 ID PROM, R/O, byte, 32 bytes */
+#define AC_PAGEMAP 0x10000000 /* 3 Pagemap R/W, long */
+#define AC_SEGMAP 0x20000000 /* 3 Segment map, byte */
+#define AC_CONTEXT 0x30000000 /* 34c current mmu-context */
+#define AC_SENABLE 0x40000000 /* 34c system dvma/cache/reset enable reg*/
+#define AC_UDVMA_ENB 0x50000000 /* 34 Not used on Sun boards, byte */
+#define AC_BUS_ERROR 0x60000000 /* 34 Cleared on read, byte. */
+#define AC_SYNC_ERR 0x60000000 /* c fault type */
+#define AC_SYNC_VA 0x60000004 /* c fault virtual address */
+#define AC_ASYNC_ERR 0x60000008 /* c asynchronous fault type */
+#define AC_ASYNC_VA 0x6000000c /* c async fault virtual address */
+#define AC_LEDS 0x70000000 /* 34 Zero turns on LEDs, byte */
+#define AC_CACHETAGS 0x80000000 /* 34c direct access to the VAC tags */
+#define AC_CACHEDDATA 0x90000000 /* 3 c direct access to the VAC data */
+#define AC_UDVMA_MAP 0xD0000000 /* 4 Not used on Sun boards, byte */
+#define AC_VME_VECTOR 0xE0000000 /* 4 For non-Autovector VME, byte */
+#define AC_BOOT_SCC 0xF0000000 /* 34 bypass to access Zilog 8530. byte.*/
+
+#define SUN3_PAGE_CHG_MASK (SUN3_PAGE_PGNUM_MASK \
+ | SUN3_PAGE_ACCESSED | SUN3_PAGE_MODIFIED)
+
+/* Bus access type within PTE. */
+#define SUN3_PAGE_TYPE_MASK (0x0c000000)
+#define SUN3_PAGE_TYPE_MEMORY (0x00000000)
+#define SUN3_PAGE_TYPE_IO (0x04000000)
+#define SUN3_PAGE_TYPE_VME16 (0x08000000)
+#define SUN3_PAGE_TYPE_VME32 (0x0c000000)
+
+/* Mask for page number within PTE. */
+#define SUN3_PAGE_PGNUM_MASK (0x0007FFFF)
+
+/* Bits within bus-error register. */
+#define SUN3_BUSERR_WATCHDOG (0x01)
+#define SUN3_BUSERR_unused (0x02)
+#define SUN3_BUSERR_FPAENERR (0x04)
+#define SUN3_BUSERR_FPABERR (0x08)
+#define SUN3_BUSERR_VMEBERR (0x10)
+#define SUN3_BUSERR_TIMEOUT (0x20)
+#define SUN3_BUSERR_PROTERR (0x40)
+#define SUN3_BUSERR_INVALID (0x80)
+
+#ifndef __ASSEMBLY__
+
+/* Read bus error status register (implicitly clearing it). */
+static inline unsigned char sun3_get_buserr(void)
+{
+ unsigned char sfc, c;
+
+ GET_SFC (sfc);
+ SET_SFC (FC_CONTROL);
+ GET_CONTROL_BYTE (AC_BUS_ERROR, c);
+ SET_SFC (sfc);
+
+ return c;
+}
+
+/* Read segmap from hardware MMU. */
+static inline unsigned long sun3_get_segmap(unsigned long addr)
+{
+ register unsigned long entry;
+ unsigned char c, sfc;
+
+ GET_SFC (sfc);
+ SET_SFC (FC_CONTROL);
+ GET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), c);
+ SET_SFC (sfc);
+ entry = c;
+
+ return entry;
+}
+
+/* Write segmap to hardware MMU. */
+static inline void sun3_put_segmap(unsigned long addr, unsigned long entry)
+{
+ unsigned char sfc;
+
+ GET_DFC (sfc);
+ SET_DFC (FC_CONTROL);
+ SET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), entry);
+ SET_DFC (sfc);
+
+ return;
+}
+
+/* Read PTE from hardware MMU. */
+static inline unsigned long sun3_get_pte(unsigned long addr)
+{
+ register unsigned long entry;
+ unsigned char sfc;
+
+ GET_SFC (sfc);
+ SET_SFC (FC_CONTROL);
+ GET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
+ SET_SFC (sfc);
+
+ return entry;
+}
+
+/* Write PTE to hardware MMU. */
+static inline void sun3_put_pte(unsigned long addr, unsigned long entry)
+{
+ unsigned char sfc;
+
+ GET_DFC (sfc);
+ SET_DFC (FC_CONTROL);
+ SET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
+ SET_DFC (sfc);
+
+ return;
+}
+
+/* get current context */
+static inline unsigned char sun3_get_context(void)
+{
+ unsigned char sfc, c;
+
+ GET_SFC(sfc);
+ SET_SFC(FC_CONTROL);
+ GET_CONTROL_BYTE(AC_CONTEXT, c);
+ SET_SFC(sfc);
+
+ return c;
+}
+
+/* set alternate context */
+static inline void sun3_put_context(unsigned char c)
+{
+ unsigned char dfc;
+ GET_DFC(dfc);
+ SET_DFC(FC_CONTROL);
+ SET_CONTROL_BYTE(AC_CONTEXT, c);
+ SET_DFC(dfc);
+
+ return;
+}
+
+extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
+ unsigned long type);
+
+extern int sun3_map_test(unsigned long addr, char *val);
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* !__SUN3_MMU_H__ */