1 files changed, 630 insertions, 0 deletions

diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h
new file mode 100644
index 000000000000..039845f2e6b0
--- /dev/null
+++ b/include/asm-mips/io.h
@@ -0,0 +1,630 @@
+/*
+ * 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 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/config.h>
+#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#include <asm/addrspace.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 <mangle-port.h>
+
+/*
+ * Slowdown I/O port space accesses for antique hardware.
+ */
+#undef CONF_SLOWDOWN_IO
+
+/*
+ * 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(x)       (x)
+# define __raw_ioswabw(x)       (x)
+# define __raw_ioswabl(x)       (x)
+# define __raw_ioswabq(x)       (x)
+
+/*
+ * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
+ * less sane hardware forces software to fiddle with this...
+ */
+#if defined(CONFIG_SWAP_IO_SPACE)
+
+# define ioswabb(x)             (x)
+# ifdef CONFIG_SGI_IP22
+/*
+ * IP22 seems braindead enough to swap 16bits values in hardware, but
+ * not 32bits.  Go figure... Can't tell without documentation.
+ */
+#  define ioswabw(x)            (x)
+# else
+#  define ioswabw(x)            le16_to_cpu(x)
+# endif
+# define ioswabl(x)             le32_to_cpu(x)
+# define ioswabq(x)             le64_to_cpu(x)
+
+#else
+
+# define ioswabb(x)             (x)
+# define ioswabw(x)             (x)
+# define ioswabl(x)             (x)
+# define ioswabq(x)             (x)
+
+#endif
+
+/*
+ * Native bus accesses never swapped.
+ */
+#define bus_ioswabb(x)          (x)
+#define bus_ioswabw(x)          (x)
+#define bus_ioswabl(x)          (x)
+#define bus_ioswabq(x)          (x)
+
+#define __bus_ioswabq           bus_ioswabq
+
+#define IO_SPACE_LIMIT 0xffff
+
+/*
+ * 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
+ * on any sane architecture; generic code does not use this assumption.
+ */
+extern const unsigned long mips_io_port_base;
+
+#define set_io_port_base(base)  \
+        do { * (unsigned long *) &mips_io_port_base = (base); } while (0)
+
+/*
+ * Thanks to James van Artsdalen for a better timing-fix than
+ * the two short jumps: using outb's to a nonexistent port seems
+ * to guarantee better timings even on fast machines.
+ *
+ * On the other hand, I'd like to be sure of a non-existent port:
+ * I feel a bit unsafe about using 0x80 (should be safe, though)
+ *
+ *              Linus
+ *
+ */
+
+#define __SLOW_DOWN_IO \
+        __asm__ __volatile__( \
+                "sb\t$0,0x80(%0)" \
+                : : "r" (mips_io_port_base));
+
+#ifdef CONF_SLOWDOWN_IO
+#ifdef REALLY_SLOW_IO
+#define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
+#else
+#define SLOW_DOWN_IO __SLOW_DOWN_IO
+#endif
+#else
+#define SLOW_DOWN_IO
+#endif
+
+/*
+ *     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(volatile void * address)
+{
+        return (unsigned long)address - PAGE_OFFSET;
+}
+
+/*
+ *     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 (void *)(address + PAGE_OFFSET);
+}
+
+/*
+ * 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 (unsigned long)address - PAGE_OFFSET;
+}
+
+static inline void * isa_bus_to_virt(unsigned long address)
+{
+        return (void *)(address + PAGE_OFFSET);
+}
+
+#define isa_page_to_bus page_to_phys
+
+/*
+ * However PCI ones are not necessarily 1:1 and therefore these interfaces
+ * are forbidden in portable PCI drivers.
+ *
+ * Allow them for x86 for legacy drivers, though.
+ */
+#define virt_to_bus virt_to_phys
+#define bus_to_virt phys_to_virt
+
+/*
+ * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
+ * for the processor.  This implies the assumption that there is only
+ * one of these busses.
+ */
+extern unsigned long isa_slot_offset;
+
+/*
+ * Change "struct page" to physical address.
+ */
+#define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
+
+extern void * __ioremap(phys_t offset, phys_t size, unsigned long flags);
+extern void __iounmap(volatile void __iomem *addr);
+
+static inline void * __ioremap_mode(phys_t offset, unsigned long size,
+        unsigned long flags)
+{
+        if (cpu_has_64bit_addresses) {
+                u64 base = UNCAC_BASE;
+
+                /*
+                 * R10000 supports a 2 bit uncached attribute therefore
+                 * UNCAC_BASE may not equal IO_BASE.
+                 */
+                if (flags == _CACHE_UNCACHED)
+                        base = (u64) IO_BASE;
+                return (void *) (unsigned long) (base + offset);
+        }
+
+        return __ioremap(offset, size, flags);
+}
+
+/*
+ * 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_mode((offset), (size), _CACHE_UNCACHED)
+
+/*
+ * ioremap_nocache     -   map bus memory into CPU space
+ * @offset:    bus address of the memory
+ * @size:      size of the resource to map
+ *
+ * ioremap_nocache 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
+ * on the CPU as well as honouring existing caching rules from things like
+ * the PCI bus. Note that there are other caches and buffers on many
+ * busses. In paticular driver authors should read up on PCI writes
+ *
+ * It's useful if some control registers are in such an area and
+ * write combining or read caching is not desirable:
+ */
+#define ioremap_nocache(offset, size)                                   \
+        __ioremap_mode((offset), (size), _CACHE_UNCACHED)
+
+/*
+ * These two are MIPS specific ioremap variant.  ioremap_cacheable_cow
+ * requests a cachable mapping, ioremap_uncached_accelerated requests a
+ * mapping using the uncached accelerated mode which isn't supported on
+ * all processors.
+ */
+#define ioremap_cacheable_cow(offset, size)                             \
+        __ioremap_mode((offset), (size), _CACHE_CACHABLE_COW)
+#define ioremap_uncached_accelerated(offset, size)                      \
+        __ioremap_mode((offset), (size), _CACHE_UNCACHED_ACCELERATED)
+
+static inline void iounmap(volatile void __iomem *addr)
+{
+        if (cpu_has_64bit_addresses)
+                return;
+
+        __iounmap(addr);
+}
+
+
+#define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq)                     \
+                                                                        \
+static inline void pfx##write##bwlq(type val,                           \
+                                    volatile void __iomem *mem)         \
+{                                                                       \
+        volatile type *__mem;                                           \
+        type __val;                                                     \
+                                                                        \
+        __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem));    \
+                                                                        \
+        __val = pfx##ioswab##bwlq(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   mips3"          "\t\t# __writeq""\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   mips0"                          "\n"    \
+                        : "=r" (__tmp)                                  \
+                        : "0" (__val), "m" (*__mem));                   \
+                if (irq)                                                \
+                        local_irq_restore(__flags);                     \
+        } else                                                          \
+                BUG();                                                  \
+}                                                                       \
+                                                                        \
+static inline type pfx##read##bwlq(volatile void __iomem *mem)          \
+{                                                                       \
+        volatile type *__mem;                                           \
+        type __val;                                                     \
+                                                                        \
+        __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem));    \
+                                                                        \
+        if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
+                __val = *__mem;                                         \
+        else if (cpu_has_64bits) {                                      \
+                unsigned long __flags;                                  \
+                                                                        \
+                local_irq_save(__flags);                                \
+                __asm__ __volatile__(                                   \
+                        ".set   mips3"          "\t\t# __readq" "\n\t"  \
+                        "ld     %L0, %1"                        "\n\t"  \
+                        "dsra32 %M0, %L0, 0"                    "\n\t"  \
+                        "sll    %L0, %L0, 0"                    "\n\t"  \
+                        ".set   mips0"                          "\n"    \
+                        : "=r" (__val)                                  \
+                        : "m" (*__mem));                                \
+                local_irq_restore(__flags);                             \
+        } else {                                                        \
+                __val = 0;                                              \
+                BUG();                                                  \
+        }                                                               \
+                                                                        \
+        return pfx##ioswab##bwlq(__val);                                \
+}
+
+#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow)                 \
+                                                                        \
+static inline void pfx##out##bwlq##p(type val, unsigned long port)      \
+{                                                                       \
+        volatile type *__addr;                                          \
+        type __val;                                                     \
+                                                                        \
+        port = __swizzle_addr_##bwlq(port);                             \
+        __addr = (void *)(mips_io_port_base + port);                    \
+                                                                        \
+        __val = pfx##ioswab##bwlq(val);                                 \
+                                                                        \
+        if (sizeof(type) != sizeof(u64)) {                              \
+                *__addr = __val;                                        \
+                slow;                                                   \
+        } else                                                          \
+                BUILD_BUG();                                            \
+}                                                                       \
+                                                                        \
+static inline type pfx##in##bwlq##p(unsigned long port)                 \
+{                                                                       \
+        volatile type *__addr;                                          \
+        type __val;                                                     \
+                                                                        \
+        port = __swizzle_addr_##bwlq(port);                             \
+        __addr = (void *)(mips_io_port_base + port);                    \
+                                                                        \
+        if (sizeof(type) != sizeof(u64)) {                              \
+                __val = *__addr;                                        \
+                slow;                                                   \
+        } else {                                                        \
+                __val = 0;                                              \
+                BUILD_BUG();                                            \
+        }                                                               \
+                                                                        \
+        return pfx##ioswab##bwlq(__val);                                \
+}
+
+#define __BUILD_MEMORY_PFX(bus, bwlq, type)                             \
+                                                                        \
+__BUILD_MEMORY_SINGLE(bus, bwlq, type, 1)
+
+#define __BUILD_IOPORT_PFX(bus, bwlq, type)                             \
+                                                                        \
+__BUILD_IOPORT_SINGLE(bus, bwlq, type, ,)                               \
+__BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO)
+
+#define BUILDIO(bwlq, type)                                             \
+                                                                        \
+__BUILD_MEMORY_PFX(, bwlq, type)                                        \
+__BUILD_MEMORY_PFX(__raw_, bwlq, type)                                  \
+__BUILD_MEMORY_PFX(bus_, bwlq, type)                                    \
+__BUILD_IOPORT_PFX(, bwlq, type)                                        \
+__BUILD_IOPORT_PFX(__raw_, bwlq, type)
+
+#define __BUILDIO(bwlq, type)                                           \
+                                                                        \
+__BUILD_MEMORY_SINGLE(__bus_, bwlq, type, 0)
+
+BUILDIO(b, u8)
+BUILDIO(w, u16)
+BUILDIO(l, u32)
+BUILDIO(q, u64)
+
+__BUILDIO(q, u64)
+
+#define readb_relaxed                   readb
+#define readw_relaxed                   readw
+#define readl_relaxed                   readl
+#define readq_relaxed                   readq
+
+/*
+ * Some code tests for these symbols
+ */
+#define readq                           readq
+#define writeq                          writeq
+
+#define __BUILD_MEMORY_STRING(bwlq, type)                               \
+                                                                        \
+static inline void writes##bwlq(volatile void __iomem *mem, void *addr, \
+                                unsigned int count)                     \
+{                                                                       \
+        volatile type *__addr = addr;                                   \
+                                                                        \
+        while (count--) {                                               \
+                __raw_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 = __raw_read##bwlq(mem);                        \
+                __addr++;                                               \
+        }                                                               \
+}
+
+#define __BUILD_IOPORT_STRING(bwlq, type)                               \
+                                                                        \
+static inline void outs##bwlq(unsigned long port, void *addr,           \
+                              unsigned int count)                       \
+{                                                                       \
+        volatile type *__addr = addr;                                   \
+                                                                        \
+        while (count--) {                                               \
+                __raw_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 = __raw_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)
+BUILDSTRING(q, u64)
+
+
+/* Depends on MIPS II instruction set */
+#define mmiowb() asm volatile ("sync" ::: "memory")
+
+#define memset_io(a,b,c)        memset((void *)(a),(b),(c))
+#define memcpy_fromio(a,b,c)    memcpy((a),(void *)(b),(c))
+#define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
+
+/*
+ * Memory Mapped I/O
+ */
+#define ioread8(addr)           readb(addr)
+#define ioread16(addr)          readw(addr)
+#define ioread32(addr)          readl(addr)
+
+#define iowrite8(b,addr)        writeb(b,addr)
+#define iowrite16(w,addr)       writew(w,addr)
+#define iowrite32(l,addr)       writel(l,addr)
+
+#define ioread8_rep(a,b,c)      readsb(a,b,c)
+#define ioread16_rep(a,b,c)     readsw(a,b,c)
+#define ioread32_rep(a,b,c)     readsl(a,b,c)
+
+#define iowrite8_rep(a,b,c)     writesb(a,b,c)
+#define iowrite16_rep(a,b,c)    writesw(a,b,c)
+#define iowrite32_rep(a,b,c)    writesl(a,b,c)
+
+/* Create a virtual mapping cookie for an IO port range */
+extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
+extern void ioport_unmap(void __iomem *);
+
+/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
+struct pci_dev;
+extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
+extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
+
+/*
+ * ISA space is 'always mapped' on currently supported MIPS systems, no need
+ * to explicitly ioremap() it. The fact that the ISA IO space is mapped
+ * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
+ * are physical addresses. The following constant pointer can be
+ * used as the IO-area pointer (it can be iounmapped as well, so the
+ * analogy with PCI is quite large):
+ */
+#define __ISA_IO_base ((char *)(isa_slot_offset))
+
+#define isa_readb(a)            readb(__ISA_IO_base + (a))
+#define isa_readw(a)            readw(__ISA_IO_base + (a))
+#define isa_readl(a)            readl(__ISA_IO_base + (a))
+#define isa_readq(a)            readq(__ISA_IO_base + (a))
+#define isa_writeb(b,a)         writeb(b,__ISA_IO_base + (a))
+#define isa_writew(w,a)         writew(w,__ISA_IO_base + (a))
+#define isa_writel(l,a)         writel(l,__ISA_IO_base + (a))
+#define isa_writeq(q,a)         writeq(q,__ISA_IO_base + (a))
+#define isa_memset_io(a,b,c)    memset_io(__ISA_IO_base + (a),(b),(c))
+#define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ISA_IO_base + (b),(c))
+#define isa_memcpy_toio(a,b,c)  memcpy_toio(__ISA_IO_base + (a),(b),(c))
+
+/*
+ * We don't have csum_partial_copy_fromio() yet, so we cheat here and
+ * just copy it. The net code will then do the checksum later.
+ */
+#define eth_io_copy_and_sum(skb,src,len,unused) memcpy_fromio((skb)->data,(src),(len))
+#define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(b),(c),(d))
+
+/*
+ *     check_signature         -       find BIOS signatures
+ *     @io_addr: mmio address to check
+ *     @signature:  signature block
+ *     @length: length of signature
+ *
+ *     Perform a signature comparison with the mmio address io_addr. This
+ *     address should have been obtained by ioremap.
+ *     Returns 1 on a match.
+ */
+static inline int check_signature(char __iomem *io_addr,
+        const unsigned char *signature, int length)
+{
+        int retval = 0;
+        do {
+                if (readb(io_addr) != *signature)
+                        goto out;
+                io_addr++;
+                signature++;
+                length--;
+        } while (length);
+        retval = 1;
+out:
+        return retval;
+}
+
+/*
+ * 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.
+ */
+#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)
+
+/*
+ * Convert a virtual cached pointer to an uncached pointer
+ */
+#define xlate_dev_kmem_ptr(p)   p
+
+#endif /* _ASM_IO_H */