summaryrefslogtreecommitdiffstats
path: root/arch/loongarch/include/asm/addrspace.h
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--arch/loongarch/include/asm/addrspace.h128
1 files changed, 128 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/addrspace.h b/arch/loongarch/include/asm/addrspace.h
new file mode 100644
index 000000000..d342935e5
--- /dev/null
+++ b/arch/loongarch/include/asm/addrspace.h
@@ -0,0 +1,128 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ *
+ * Derived from MIPS:
+ * Copyright (C) 1996, 99 Ralf Baechle
+ * Copyright (C) 2000, 2002 Maciej W. Rozycki
+ * Copyright (C) 1990, 1999 by Silicon Graphics, Inc.
+ */
+#ifndef _ASM_ADDRSPACE_H
+#define _ASM_ADDRSPACE_H
+
+#include <linux/const.h>
+
+#include <asm/loongarch.h>
+
+/*
+ * This gives the physical RAM offset.
+ */
+#ifndef __ASSEMBLY__
+#ifndef PHYS_OFFSET
+#define PHYS_OFFSET _AC(0, UL)
+#endif
+extern unsigned long vm_map_base;
+#endif /* __ASSEMBLY__ */
+
+#ifndef IO_BASE
+#define IO_BASE CSR_DMW0_BASE
+#endif
+
+#ifndef CACHE_BASE
+#define CACHE_BASE CSR_DMW1_BASE
+#endif
+
+#ifndef UNCACHE_BASE
+#define UNCACHE_BASE CSR_DMW0_BASE
+#endif
+
+#define DMW_PABITS 48
+#define TO_PHYS_MASK ((1ULL << DMW_PABITS) - 1)
+
+/*
+ * Memory above this physical address will be considered highmem.
+ */
+#ifndef HIGHMEM_START
+#define HIGHMEM_START (_AC(1, UL) << _AC(DMW_PABITS, UL))
+#endif
+
+#define TO_PHYS(x) ( ((x) & TO_PHYS_MASK))
+#define TO_CACHE(x) (CACHE_BASE | ((x) & TO_PHYS_MASK))
+#define TO_UNCACHE(x) (UNCACHE_BASE | ((x) & TO_PHYS_MASK))
+
+/*
+ * This handles the memory map.
+ */
+#ifndef PAGE_OFFSET
+#define PAGE_OFFSET (CACHE_BASE + PHYS_OFFSET)
+#endif
+
+#ifndef FIXADDR_TOP
+#define FIXADDR_TOP ((unsigned long)(long)(int)0xfffe0000)
+#endif
+
+#ifdef __ASSEMBLY__
+#define _ATYPE_
+#define _ATYPE32_
+#define _ATYPE64_
+#define _CONST64_(x) x
+#else
+#define _ATYPE_ __PTRDIFF_TYPE__
+#define _ATYPE32_ int
+#define _ATYPE64_ __s64
+#ifdef CONFIG_64BIT
+#define _CONST64_(x) x ## L
+#else
+#define _CONST64_(x) x ## LL
+#endif
+#endif
+
+/*
+ * 32/64-bit LoongArch address spaces
+ */
+#ifdef __ASSEMBLY__
+#define _ACAST32_
+#define _ACAST64_
+#else
+#define _ACAST32_ (_ATYPE_)(_ATYPE32_) /* widen if necessary */
+#define _ACAST64_ (_ATYPE64_) /* do _not_ narrow */
+#endif
+
+#ifdef CONFIG_32BIT
+
+#define UVRANGE 0x00000000
+#define KPRANGE0 0x80000000
+#define KPRANGE1 0xa0000000
+#define KVRANGE 0xc0000000
+
+#else
+
+#define XUVRANGE _CONST64_(0x0000000000000000)
+#define XSPRANGE _CONST64_(0x4000000000000000)
+#define XKPRANGE _CONST64_(0x8000000000000000)
+#define XKVRANGE _CONST64_(0xc000000000000000)
+
+#endif
+
+/*
+ * Returns the physical address of a KPRANGEx / XKPRANGE address
+ */
+#define PHYSADDR(a) ((_ACAST64_(a)) & TO_PHYS_MASK)
+
+/*
+ * On LoongArch, I/O ports mappring is following:
+ *
+ * | .... |
+ * |-----------------------|
+ * | pci io ports(16K~32M) |
+ * |-----------------------|
+ * | isa io ports(0 ~16K) |
+ * PCI_IOBASE ->|-----------------------|
+ * | .... |
+ */
+#define PCI_IOBASE ((void __iomem *)(vm_map_base + (2 * PAGE_SIZE)))
+#define PCI_IOSIZE SZ_32M
+#define ISA_IOSIZE SZ_16K
+#define IO_SPACE_LIMIT (PCI_IOSIZE - 1)
+
+#endif /* _ASM_ADDRSPACE_H */