summaryrefslogtreecommitdiffstats
path: root/arch/mips/include/asm/io.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/include/asm/io.h')
-rw-r--r--arch/mips/include/asm/io.h560
1 files changed, 560 insertions, 0 deletions
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
new file mode 100644
index 0000000000..062dd4e6b9
--- /dev/null
+++ b/arch/mips/include/asm/io.h
@@ -0,0 +1,560 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994, 1995 Waldorf GmbH
+ * Copyright (C) 1994 - 2000, 06 Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
+ * Author: Maciej W. Rozycki <macro@mips.com>
+ */
+#ifndef _ASM_IO_H
+#define _ASM_IO_H
+
+#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/irqflags.h>
+
+#include <asm/addrspace.h>
+#include <asm/barrier.h>
+#include <asm/bug.h>
+#include <asm/byteorder.h>
+#include <asm/cpu.h>
+#include <asm/cpu-features.h>
+#include <asm/page.h>
+#include <asm/pgtable-bits.h>
+#include <asm/processor.h>
+#include <asm/string.h>
+#include <mangle-port.h>
+
+/*
+ * Raw operations are never swapped in software. OTOH values that raw
+ * operations are working on may or may not have been swapped by the bus
+ * hardware. An example use would be for flash memory that's used for
+ * execute in place.
+ */
+# define __raw_ioswabb(a, x) (x)
+# define __raw_ioswabw(a, x) (x)
+# define __raw_ioswabl(a, x) (x)
+# define __raw_ioswabq(a, x) (x)
+# define ____raw_ioswabq(a, x) (x)
+
+# define __relaxed_ioswabb ioswabb
+# define __relaxed_ioswabw ioswabw
+# define __relaxed_ioswabl ioswabl
+# define __relaxed_ioswabq ioswabq
+
+/* ioswab[bwlq], __mem_ioswab[bwlq] are defined in mangle-port.h */
+
+/*
+ * On MIPS I/O ports are memory mapped, so we access them using normal
+ * load/store instructions. mips_io_port_base is the virtual address to
+ * which all ports are being mapped. For sake of efficiency some code
+ * assumes that this is an address that can be loaded with a single lui
+ * instruction, so the lower 16 bits must be zero. Should be true on
+ * any sane architecture; generic code does not use this assumption.
+ */
+extern unsigned long mips_io_port_base;
+
+static inline void set_io_port_base(unsigned long base)
+{
+ mips_io_port_base = base;
+}
+
+/*
+ * Provide the necessary definitions for generic iomap. We make use of
+ * mips_io_port_base for iomap(), but we don't reserve any low addresses for
+ * use with I/O ports.
+ */
+
+#define HAVE_ARCH_PIO_SIZE
+#define PIO_OFFSET mips_io_port_base
+#define PIO_MASK IO_SPACE_LIMIT
+#define PIO_RESERVED 0x0UL
+
+/*
+ * Enforce in-order execution of data I/O. In the MIPS architecture
+ * these are equivalent to corresponding platform-specific memory
+ * barriers defined in <asm/barrier.h>. API pinched from PowerPC,
+ * with sync additionally defined.
+ */
+#define iobarrier_rw() mb()
+#define iobarrier_r() rmb()
+#define iobarrier_w() wmb()
+#define iobarrier_sync() iob()
+
+/*
+ * virt_to_phys - map virtual addresses to physical
+ * @address: address to remap
+ *
+ * The returned physical address is the physical (CPU) mapping for
+ * the memory address given. It is only valid to use this function on
+ * addresses directly mapped or allocated via kmalloc.
+ *
+ * This function does not give bus mappings for DMA transfers. In
+ * almost all conceivable cases a device driver should not be using
+ * this function
+ */
+static inline unsigned long __virt_to_phys_nodebug(volatile const void *address)
+{
+ return __pa(address);
+}
+
+#ifdef CONFIG_DEBUG_VIRTUAL
+extern phys_addr_t __virt_to_phys(volatile const void *x);
+#else
+#define __virt_to_phys(x) __virt_to_phys_nodebug(x)
+#endif
+
+#define virt_to_phys virt_to_phys
+static inline phys_addr_t virt_to_phys(const volatile void *x)
+{
+ return __virt_to_phys(x);
+}
+
+/*
+ * phys_to_virt - map physical address to virtual
+ * @address: address to remap
+ *
+ * The returned virtual address is a current CPU mapping for
+ * the memory address given. It is only valid to use this function on
+ * addresses that have a kernel mapping
+ *
+ * This function does not handle bus mappings for DMA transfers. In
+ * almost all conceivable cases a device driver should not be using
+ * this function
+ */
+static inline void * phys_to_virt(unsigned long address)
+{
+ return __va(address);
+}
+
+/*
+ * ISA I/O bus memory addresses are 1:1 with the physical address.
+ */
+static inline unsigned long isa_virt_to_bus(volatile void *address)
+{
+ return virt_to_phys(address);
+}
+
+static inline void *isa_bus_to_virt(unsigned long address)
+{
+ return phys_to_virt(address);
+}
+
+/*
+ * Change "struct page" to physical address.
+ */
+#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
+
+void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size,
+ unsigned long prot_val);
+void iounmap(const volatile void __iomem *addr);
+
+/*
+ * ioremap - map bus memory into CPU space
+ * @offset: bus address of the memory
+ * @size: size of the resource to map
+ *
+ * ioremap performs a platform specific sequence of operations to
+ * make bus memory CPU accessible via the readb/readw/readl/writeb/
+ * writew/writel functions and the other mmio helpers. The returned
+ * address is not guaranteed to be usable directly as a virtual
+ * address.
+ */
+#define ioremap(offset, size) \
+ ioremap_prot((offset), (size), _CACHE_UNCACHED)
+#define ioremap_uc ioremap
+
+/*
+ * ioremap_cache - map bus memory into CPU space
+ * @offset: bus address of the memory
+ * @size: size of the resource to map
+ *
+ * ioremap_cache performs a platform specific sequence of operations to
+ * make bus memory CPU accessible via the readb/readw/readl/writeb/
+ * writew/writel functions and the other mmio helpers. The returned
+ * address is not guaranteed to be usable directly as a virtual
+ * address.
+ *
+ * This version of ioremap ensures that the memory is marked cachable by
+ * the CPU. Also enables full write-combining. Useful for some
+ * memory-like regions on I/O busses.
+ */
+#define ioremap_cache(offset, size) \
+ ioremap_prot((offset), (size), _page_cachable_default)
+
+/*
+ * ioremap_wc - map bus memory into CPU space
+ * @offset: bus address of the memory
+ * @size: size of the resource to map
+ *
+ * ioremap_wc performs a platform specific sequence of operations to
+ * make bus memory CPU accessible via the readb/readw/readl/writeb/
+ * writew/writel functions and the other mmio helpers. The returned
+ * address is not guaranteed to be usable directly as a virtual
+ * address.
+ *
+ * This version of ioremap ensures that the memory is marked uncachable
+ * but accelerated by means of write-combining feature. It is specifically
+ * useful for PCIe prefetchable windows, which may vastly improve a
+ * communications performance. If it was determined on boot stage, what
+ * CPU CCA doesn't support UCA, the method shall fall-back to the
+ * _CACHE_UNCACHED option (see cpu_probe() method).
+ */
+#define ioremap_wc(offset, size) \
+ ioremap_prot((offset), (size), boot_cpu_data.writecombine)
+
+#include <asm-generic/iomap.h>
+
+#if defined(CONFIG_CPU_CAVIUM_OCTEON)
+#define war_io_reorder_wmb() wmb()
+#else
+#define war_io_reorder_wmb() barrier()
+#endif
+
+#define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, barrier, relax, irq) \
+ \
+static inline void pfx##write##bwlq(type val, \
+ volatile void __iomem *mem) \
+{ \
+ volatile type *__mem; \
+ type __val; \
+ \
+ if (barrier) \
+ iobarrier_rw(); \
+ else \
+ war_io_reorder_wmb(); \
+ \
+ __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \
+ \
+ __val = pfx##ioswab##bwlq(__mem, val); \
+ \
+ if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
+ *__mem = __val; \
+ else if (cpu_has_64bits) { \
+ unsigned long __flags; \
+ type __tmp; \
+ \
+ if (irq) \
+ local_irq_save(__flags); \
+ __asm__ __volatile__( \
+ ".set push" "\t\t# __writeq""\n\t" \
+ ".set arch=r4000" "\n\t" \
+ "dsll32 %L0, %L0, 0" "\n\t" \
+ "dsrl32 %L0, %L0, 0" "\n\t" \
+ "dsll32 %M0, %M0, 0" "\n\t" \
+ "or %L0, %L0, %M0" "\n\t" \
+ "sd %L0, %2" "\n\t" \
+ ".set pop" "\n" \
+ : "=r" (__tmp) \
+ : "0" (__val), "m" (*__mem)); \
+ if (irq) \
+ local_irq_restore(__flags); \
+ } else \
+ BUG(); \
+} \
+ \
+static inline type pfx##read##bwlq(const volatile void __iomem *mem) \
+{ \
+ volatile type *__mem; \
+ type __val; \
+ \
+ __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \
+ \
+ if (barrier) \
+ iobarrier_rw(); \
+ \
+ if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
+ __val = *__mem; \
+ else if (cpu_has_64bits) { \
+ unsigned long __flags; \
+ \
+ if (irq) \
+ local_irq_save(__flags); \
+ __asm__ __volatile__( \
+ ".set push" "\t\t# __readq" "\n\t" \
+ ".set arch=r4000" "\n\t" \
+ "ld %L0, %1" "\n\t" \
+ "dsra32 %M0, %L0, 0" "\n\t" \
+ "sll %L0, %L0, 0" "\n\t" \
+ ".set pop" "\n" \
+ : "=r" (__val) \
+ : "m" (*__mem)); \
+ if (irq) \
+ local_irq_restore(__flags); \
+ } else { \
+ __val = 0; \
+ BUG(); \
+ } \
+ \
+ /* prevent prefetching of coherent DMA data prematurely */ \
+ if (!relax) \
+ rmb(); \
+ return pfx##ioswab##bwlq(__mem, __val); \
+}
+
+#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, barrier, relax, p) \
+ \
+static inline void pfx##out##bwlq##p(type val, unsigned long port) \
+{ \
+ volatile type *__addr; \
+ type __val; \
+ \
+ if (barrier) \
+ iobarrier_rw(); \
+ else \
+ war_io_reorder_wmb(); \
+ \
+ __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
+ \
+ __val = pfx##ioswab##bwlq(__addr, val); \
+ \
+ /* Really, we want this to be atomic */ \
+ BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \
+ \
+ *__addr = __val; \
+} \
+ \
+static inline type pfx##in##bwlq##p(unsigned long port) \
+{ \
+ volatile type *__addr; \
+ type __val; \
+ \
+ __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
+ \
+ BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \
+ \
+ if (barrier) \
+ iobarrier_rw(); \
+ \
+ __val = *__addr; \
+ \
+ /* prevent prefetching of coherent DMA data prematurely */ \
+ if (!relax) \
+ rmb(); \
+ return pfx##ioswab##bwlq(__addr, __val); \
+}
+
+#define __BUILD_MEMORY_PFX(bus, bwlq, type, relax) \
+ \
+__BUILD_MEMORY_SINGLE(bus, bwlq, type, 1, relax, 1)
+
+#define BUILDIO_MEM(bwlq, type) \
+ \
+__BUILD_MEMORY_PFX(__raw_, bwlq, type, 0) \
+__BUILD_MEMORY_PFX(__relaxed_, bwlq, type, 1) \
+__BUILD_MEMORY_PFX(__mem_, bwlq, type, 0) \
+__BUILD_MEMORY_PFX(, bwlq, type, 0)
+
+BUILDIO_MEM(b, u8)
+BUILDIO_MEM(w, u16)
+BUILDIO_MEM(l, u32)
+#ifdef CONFIG_64BIT
+BUILDIO_MEM(q, u64)
+#else
+__BUILD_MEMORY_PFX(__raw_, q, u64, 0)
+__BUILD_MEMORY_PFX(__mem_, q, u64, 0)
+#endif
+
+#define __BUILD_IOPORT_PFX(bus, bwlq, type) \
+ __BUILD_IOPORT_SINGLE(bus, bwlq, type, 1, 0,) \
+ __BUILD_IOPORT_SINGLE(bus, bwlq, type, 1, 0, _p)
+
+#define BUILDIO_IOPORT(bwlq, type) \
+ __BUILD_IOPORT_PFX(, bwlq, type) \
+ __BUILD_IOPORT_PFX(__mem_, bwlq, type)
+
+BUILDIO_IOPORT(b, u8)
+BUILDIO_IOPORT(w, u16)
+BUILDIO_IOPORT(l, u32)
+#ifdef CONFIG_64BIT
+BUILDIO_IOPORT(q, u64)
+#endif
+
+#define __BUILDIO(bwlq, type) \
+ \
+__BUILD_MEMORY_SINGLE(____raw_, bwlq, type, 1, 0, 0)
+
+__BUILDIO(q, u64)
+
+#define readb_relaxed __relaxed_readb
+#define readw_relaxed __relaxed_readw
+#define readl_relaxed __relaxed_readl
+#ifdef CONFIG_64BIT
+#define readq_relaxed __relaxed_readq
+#endif
+
+#define writeb_relaxed __relaxed_writeb
+#define writew_relaxed __relaxed_writew
+#define writel_relaxed __relaxed_writel
+#ifdef CONFIG_64BIT
+#define writeq_relaxed __relaxed_writeq
+#endif
+
+#define readb_be(addr) \
+ __raw_readb((__force unsigned *)(addr))
+#define readw_be(addr) \
+ be16_to_cpu(__raw_readw((__force unsigned *)(addr)))
+#define readl_be(addr) \
+ be32_to_cpu(__raw_readl((__force unsigned *)(addr)))
+#define readq_be(addr) \
+ be64_to_cpu(__raw_readq((__force unsigned *)(addr)))
+
+#define writeb_be(val, addr) \
+ __raw_writeb((val), (__force unsigned *)(addr))
+#define writew_be(val, addr) \
+ __raw_writew(cpu_to_be16((val)), (__force unsigned *)(addr))
+#define writel_be(val, addr) \
+ __raw_writel(cpu_to_be32((val)), (__force unsigned *)(addr))
+#define writeq_be(val, addr) \
+ __raw_writeq(cpu_to_be64((val)), (__force unsigned *)(addr))
+
+/*
+ * Some code tests for these symbols
+ */
+#ifdef CONFIG_64BIT
+#define readq readq
+#define writeq writeq
+#endif
+
+#define __BUILD_MEMORY_STRING(bwlq, type) \
+ \
+static inline void writes##bwlq(volatile void __iomem *mem, \
+ const void *addr, unsigned int count) \
+{ \
+ const volatile type *__addr = addr; \
+ \
+ while (count--) { \
+ __mem_write##bwlq(*__addr, mem); \
+ __addr++; \
+ } \
+} \
+ \
+static inline void reads##bwlq(volatile void __iomem *mem, void *addr, \
+ unsigned int count) \
+{ \
+ volatile type *__addr = addr; \
+ \
+ while (count--) { \
+ *__addr = __mem_read##bwlq(mem); \
+ __addr++; \
+ } \
+}
+
+#define __BUILD_IOPORT_STRING(bwlq, type) \
+ \
+static inline void outs##bwlq(unsigned long port, const void *addr, \
+ unsigned int count) \
+{ \
+ const volatile type *__addr = addr; \
+ \
+ while (count--) { \
+ __mem_out##bwlq(*__addr, port); \
+ __addr++; \
+ } \
+} \
+ \
+static inline void ins##bwlq(unsigned long port, void *addr, \
+ unsigned int count) \
+{ \
+ volatile type *__addr = addr; \
+ \
+ while (count--) { \
+ *__addr = __mem_in##bwlq(port); \
+ __addr++; \
+ } \
+}
+
+#define BUILDSTRING(bwlq, type) \
+ \
+__BUILD_MEMORY_STRING(bwlq, type) \
+__BUILD_IOPORT_STRING(bwlq, type)
+
+BUILDSTRING(b, u8)
+BUILDSTRING(w, u16)
+BUILDSTRING(l, u32)
+#ifdef CONFIG_64BIT
+BUILDSTRING(q, u64)
+#endif
+
+static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
+{
+ memset((void __force *) addr, val, count);
+}
+static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
+{
+ memcpy(dst, (void __force *) src, count);
+}
+static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
+{
+ memcpy((void __force *) dst, src, count);
+}
+
+/*
+ * The caches on some architectures aren't dma-coherent and have need to
+ * handle this in software. There are three types of operations that
+ * can be applied to dma buffers.
+ *
+ * - dma_cache_wback_inv(start, size) makes caches and coherent by
+ * writing the content of the caches back to memory, if necessary.
+ * The function also invalidates the affected part of the caches as
+ * necessary before DMA transfers from outside to memory.
+ * - dma_cache_wback(start, size) makes caches and coherent by
+ * writing the content of the caches back to memory, if necessary.
+ * The function also invalidates the affected part of the caches as
+ * necessary before DMA transfers from outside to memory.
+ * - dma_cache_inv(start, size) invalidates the affected parts of the
+ * caches. Dirty lines of the caches may be written back or simply
+ * be discarded. This operation is necessary before dma operations
+ * to the memory.
+ *
+ * This API used to be exported; it now is for arch code internal use only.
+ */
+#ifdef CONFIG_DMA_NONCOHERENT
+
+extern void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
+extern void (*_dma_cache_wback)(unsigned long start, unsigned long size);
+extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
+
+#define dma_cache_wback_inv(start, size) _dma_cache_wback_inv(start, size)
+#define dma_cache_wback(start, size) _dma_cache_wback(start, size)
+#define dma_cache_inv(start, size) _dma_cache_inv(start, size)
+
+#else /* Sane hardware */
+
+#define dma_cache_wback_inv(start,size) \
+ do { (void) (start); (void) (size); } while (0)
+#define dma_cache_wback(start,size) \
+ do { (void) (start); (void) (size); } while (0)
+#define dma_cache_inv(start,size) \
+ do { (void) (start); (void) (size); } while (0)
+
+#endif /* CONFIG_DMA_NONCOHERENT */
+
+/*
+ * Read a 32-bit register that requires a 64-bit read cycle on the bus.
+ * Avoid interrupt mucking, just adjust the address for 4-byte access.
+ * Assume the addresses are 8-byte aligned.
+ */
+#ifdef __MIPSEB__
+#define __CSR_32_ADJUST 4
+#else
+#define __CSR_32_ADJUST 0
+#endif
+
+#define csr_out32(v, a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST) = (v))
+#define csr_in32(a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST))
+
+/*
+ * Convert a physical pointer to a virtual kernel pointer for /dev/mem
+ * access
+ */
+#define xlate_dev_mem_ptr(p) __va(p)
+#define unxlate_dev_mem_ptr(p, v) do { } while (0)
+
+void __ioread64_copy(void *to, const void __iomem *from, size_t count);
+
+#endif /* _ASM_IO_H */