Initial import

1 files changed, 584 insertions, 0 deletions

diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h
new file mode 100644
index 000000000..f05bdb4b1
--- /dev/null
+++ b/arch/alpha/include/asm/io.h
@@ -0,0 +1,584 @@
+#ifndef __ALPHA_IO_H
+#define __ALPHA_IO_H
+
+#ifdef __KERNEL__
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <asm/compiler.h>
+#include <asm/pgtable.h>
+#include <asm/machvec.h>
+#include <asm/hwrpb.h>
+
+/* The generic header contains only prototypes.  Including it ensures that
+   the implementation we have here matches that interface.  */
+#include <asm-generic/iomap.h>
+
+/* We don't use IO slowdowns on the Alpha, but.. */
+#define __SLOW_DOWN_IO	do { } while (0)
+#define SLOW_DOWN_IO	do { } while (0)
+
+/*
+ * Virtual -> physical identity mapping starts at this offset
+ */
+#ifdef USE_48_BIT_KSEG
+#define IDENT_ADDR     0xffff800000000000UL
+#else
+#define IDENT_ADDR     0xfffffc0000000000UL
+#endif
+
+/*
+ * We try to avoid hae updates (thus the cache), but when we
+ * do need to update the hae, we need to do it atomically, so
+ * that any interrupts wouldn't get confused with the hae
+ * register not being up-to-date with respect to the hardware
+ * value.
+ */
+extern inline void __set_hae(unsigned long new_hae)
+{
+	unsigned long flags = swpipl(IPL_MAX);
+
+	barrier();
+
+	alpha_mv.hae_cache = new_hae;
+	*alpha_mv.hae_register = new_hae;
+	mb();
+	/* Re-read to make sure it was written.  */
+	new_hae = *alpha_mv.hae_register;
+
+	setipl(flags);
+	barrier();
+}
+
+extern inline void set_hae(unsigned long new_hae)
+{
+	if (new_hae != alpha_mv.hae_cache)
+		__set_hae(new_hae);
+}
+
+/*
+ * Change virtual addresses to physical addresses and vv.
+ */
+#ifdef USE_48_BIT_KSEG
+static inline unsigned long virt_to_phys(void *address)
+{
+	return (unsigned long)address - IDENT_ADDR;
+}
+
+static inline void * phys_to_virt(unsigned long address)
+{
+	return (void *) (address + IDENT_ADDR);
+}
+#else
+static inline unsigned long virt_to_phys(void *address)
+{
+        unsigned long phys = (unsigned long)address;
+
+	/* Sign-extend from bit 41.  */
+	phys <<= (64 - 41);
+	phys = (long)phys >> (64 - 41);
+
+	/* Crop to the physical address width of the processor.  */
+        phys &= (1ul << hwrpb->pa_bits) - 1;
+
+        return phys;
+}
+
+static inline void * phys_to_virt(unsigned long address)
+{
+        return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1)));
+}
+#endif
+
+#define page_to_phys(page)	page_to_pa(page)
+
+static inline dma_addr_t __deprecated isa_page_to_bus(struct page *page)
+{
+	return page_to_phys(page);
+}
+
+/* Maximum PIO space address supported?  */
+#define IO_SPACE_LIMIT 0xffff
+
+/*
+ * Change addresses as seen by the kernel (virtual) to addresses as
+ * seen by a device (bus), and vice versa.
+ *
+ * Note that this only works for a limited range of kernel addresses,
+ * and very well may not span all memory.  Consider this interface 
+ * deprecated in favour of the DMA-mapping API.
+ */
+extern unsigned long __direct_map_base;
+extern unsigned long __direct_map_size;
+
+static inline unsigned long __deprecated virt_to_bus(void *address)
+{
+	unsigned long phys = virt_to_phys(address);
+	unsigned long bus = phys + __direct_map_base;
+	return phys <= __direct_map_size ? bus : 0;
+}
+#define isa_virt_to_bus virt_to_bus
+
+static inline void * __deprecated bus_to_virt(unsigned long address)
+{
+	void *virt;
+
+	/* This check is a sanity check but also ensures that bus address 0
+	   maps to virtual address 0 which is useful to detect null pointers
+	   (the NCR driver is much simpler if NULL pointers are preserved).  */
+	address -= __direct_map_base;
+	virt = phys_to_virt(address);
+	return (long)address <= 0 ? NULL : virt;
+}
+#define isa_bus_to_virt bus_to_virt
+
+/*
+ * There are different chipsets to interface the Alpha CPUs to the world.
+ */
+
+#define IO_CONCAT(a,b)	_IO_CONCAT(a,b)
+#define _IO_CONCAT(a,b)	a ## _ ## b
+
+#ifdef CONFIG_ALPHA_GENERIC
+
+/* In a generic kernel, we always go through the machine vector.  */
+
+#define REMAP1(TYPE, NAME, QUAL)					\
+static inline TYPE generic_##NAME(QUAL void __iomem *addr)		\
+{									\
+	return alpha_mv.mv_##NAME(addr);				\
+}
+
+#define REMAP2(TYPE, NAME, QUAL)					\
+static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr)	\
+{									\
+	alpha_mv.mv_##NAME(b, addr);					\
+}
+
+REMAP1(unsigned int, ioread8, /**/)
+REMAP1(unsigned int, ioread16, /**/)
+REMAP1(unsigned int, ioread32, /**/)
+REMAP1(u8, readb, const volatile)
+REMAP1(u16, readw, const volatile)
+REMAP1(u32, readl, const volatile)
+REMAP1(u64, readq, const volatile)
+
+REMAP2(u8, iowrite8, /**/)
+REMAP2(u16, iowrite16, /**/)
+REMAP2(u32, iowrite32, /**/)
+REMAP2(u8, writeb, volatile)
+REMAP2(u16, writew, volatile)
+REMAP2(u32, writel, volatile)
+REMAP2(u64, writeq, volatile)
+
+#undef REMAP1
+#undef REMAP2
+
+extern inline void __iomem *generic_ioportmap(unsigned long a)
+{
+	return alpha_mv.mv_ioportmap(a);
+}
+
+static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s)
+{
+	return alpha_mv.mv_ioremap(a, s);
+}
+
+static inline void generic_iounmap(volatile void __iomem *a)
+{
+	return alpha_mv.mv_iounmap(a);
+}
+
+static inline int generic_is_ioaddr(unsigned long a)
+{
+	return alpha_mv.mv_is_ioaddr(a);
+}
+
+static inline int generic_is_mmio(const volatile void __iomem *a)
+{
+	return alpha_mv.mv_is_mmio(a);
+}
+
+#define __IO_PREFIX		generic
+#define generic_trivial_rw_bw	0
+#define generic_trivial_rw_lq	0
+#define generic_trivial_io_bw	0
+#define generic_trivial_io_lq	0
+#define generic_trivial_iounmap	0
+
+#else
+
+#if defined(CONFIG_ALPHA_APECS)
+# include <asm/core_apecs.h>
+#elif defined(CONFIG_ALPHA_CIA)
+# include <asm/core_cia.h>
+#elif defined(CONFIG_ALPHA_IRONGATE)
+# include <asm/core_irongate.h>
+#elif defined(CONFIG_ALPHA_JENSEN)
+# include <asm/jensen.h>
+#elif defined(CONFIG_ALPHA_LCA)
+# include <asm/core_lca.h>
+#elif defined(CONFIG_ALPHA_MARVEL)
+# include <asm/core_marvel.h>
+#elif defined(CONFIG_ALPHA_MCPCIA)
+# include <asm/core_mcpcia.h>
+#elif defined(CONFIG_ALPHA_POLARIS)
+# include <asm/core_polaris.h>
+#elif defined(CONFIG_ALPHA_T2)
+# include <asm/core_t2.h>
+#elif defined(CONFIG_ALPHA_TSUNAMI)
+# include <asm/core_tsunami.h>
+#elif defined(CONFIG_ALPHA_TITAN)
+# include <asm/core_titan.h>
+#elif defined(CONFIG_ALPHA_WILDFIRE)
+# include <asm/core_wildfire.h>
+#else
+#error "What system is this?"
+#endif
+
+#endif /* GENERIC */
+
+/*
+ * We always have external versions of these routines.
+ */
+extern u8		inb(unsigned long port);
+extern u16		inw(unsigned long port);
+extern u32		inl(unsigned long port);
+extern void		outb(u8 b, unsigned long port);
+extern void		outw(u16 b, unsigned long port);
+extern void		outl(u32 b, unsigned long port);
+
+extern u8		readb(const volatile void __iomem *addr);
+extern u16		readw(const volatile void __iomem *addr);
+extern u32		readl(const volatile void __iomem *addr);
+extern u64		readq(const volatile void __iomem *addr);
+extern void		writeb(u8 b, volatile void __iomem *addr);
+extern void		writew(u16 b, volatile void __iomem *addr);
+extern void		writel(u32 b, volatile void __iomem *addr);
+extern void		writeq(u64 b, volatile void __iomem *addr);
+
+extern u8		__raw_readb(const volatile void __iomem *addr);
+extern u16		__raw_readw(const volatile void __iomem *addr);
+extern u32		__raw_readl(const volatile void __iomem *addr);
+extern u64		__raw_readq(const volatile void __iomem *addr);
+extern void		__raw_writeb(u8 b, volatile void __iomem *addr);
+extern void		__raw_writew(u16 b, volatile void __iomem *addr);
+extern void		__raw_writel(u32 b, volatile void __iomem *addr);
+extern void		__raw_writeq(u64 b, volatile void __iomem *addr);
+
+/*
+ * Mapping from port numbers to __iomem space is pretty easy.
+ */
+
+/* These two have to be extern inline because of the extern prototype from
+   <asm-generic/iomap.h>.  It is not legal to mix "extern" and "static" for
+   the same declaration.  */
+extern inline void __iomem *ioport_map(unsigned long port, unsigned int size)
+{
+	return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
+}
+
+extern inline void ioport_unmap(void __iomem *addr)
+{
+}
+
+static inline void __iomem *ioremap(unsigned long port, unsigned long size)
+{
+	return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
+}
+
+static inline void __iomem *__ioremap(unsigned long port, unsigned long size,
+				      unsigned long flags)
+{
+	return ioremap(port, size);
+}
+
+static inline void __iomem * ioremap_nocache(unsigned long offset,
+					     unsigned long size)
+{
+	return ioremap(offset, size);
+} 
+
+static inline void iounmap(volatile void __iomem *addr)
+{
+	IO_CONCAT(__IO_PREFIX,iounmap)(addr);
+}
+
+static inline int __is_ioaddr(unsigned long addr)
+{
+	return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
+}
+#define __is_ioaddr(a)		__is_ioaddr((unsigned long)(a))
+
+static inline int __is_mmio(const volatile void __iomem *addr)
+{
+	return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
+}
+
+
+/*
+ * If the actual I/O bits are sufficiently trivial, then expand inline.
+ */
+
+#if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
+extern inline unsigned int ioread8(void __iomem *addr)
+{
+	unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
+	mb();
+	return ret;
+}
+
+extern inline unsigned int ioread16(void __iomem *addr)
+{
+	unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
+	mb();
+	return ret;
+}
+
+extern inline void iowrite8(u8 b, void __iomem *addr)
+{
+	IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
+	mb();
+}
+
+extern inline void iowrite16(u16 b, void __iomem *addr)
+{
+	IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
+	mb();
+}
+
+extern inline u8 inb(unsigned long port)
+{
+	return ioread8(ioport_map(port, 1));
+}
+
+extern inline u16 inw(unsigned long port)
+{
+	return ioread16(ioport_map(port, 2));
+}
+
+extern inline void outb(u8 b, unsigned long port)
+{
+	iowrite8(b, ioport_map(port, 1));
+}
+
+extern inline void outw(u16 b, unsigned long port)
+{
+	iowrite16(b, ioport_map(port, 2));
+}
+#endif
+
+#if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
+extern inline unsigned int ioread32(void __iomem *addr)
+{
+	unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
+	mb();
+	return ret;
+}
+
+extern inline void iowrite32(u32 b, void __iomem *addr)
+{
+	IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
+	mb();
+}
+
+extern inline u32 inl(unsigned long port)
+{
+	return ioread32(ioport_map(port, 4));
+}
+
+extern inline void outl(u32 b, unsigned long port)
+{
+	iowrite32(b, ioport_map(port, 4));
+}
+#endif
+
+#if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
+extern inline u8 __raw_readb(const volatile void __iomem *addr)
+{
+	return IO_CONCAT(__IO_PREFIX,readb)(addr);
+}
+
+extern inline u16 __raw_readw(const volatile void __iomem *addr)
+{
+	return IO_CONCAT(__IO_PREFIX,readw)(addr);
+}
+
+extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
+{
+	IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
+}
+
+extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
+{
+	IO_CONCAT(__IO_PREFIX,writew)(b, addr);
+}
+
+extern inline u8 readb(const volatile void __iomem *addr)
+{
+	u8 ret = __raw_readb(addr);
+	mb();
+	return ret;
+}
+
+extern inline u16 readw(const volatile void __iomem *addr)
+{
+	u16 ret = __raw_readw(addr);
+	mb();
+	return ret;
+}
+
+extern inline void writeb(u8 b, volatile void __iomem *addr)
+{
+	__raw_writeb(b, addr);
+	mb();
+}
+
+extern inline void writew(u16 b, volatile void __iomem *addr)
+{
+	__raw_writew(b, addr);
+	mb();
+}
+#endif
+
+#if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
+extern inline u32 __raw_readl(const volatile void __iomem *addr)
+{
+	return IO_CONCAT(__IO_PREFIX,readl)(addr);
+}
+
+extern inline u64 __raw_readq(const volatile void __iomem *addr)
+{
+	return IO_CONCAT(__IO_PREFIX,readq)(addr);
+}
+
+extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
+{
+	IO_CONCAT(__IO_PREFIX,writel)(b, addr);
+}
+
+extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
+{
+	IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
+}
+
+extern inline u32 readl(const volatile void __iomem *addr)
+{
+	u32 ret = __raw_readl(addr);
+	mb();
+	return ret;
+}
+
+extern inline u64 readq(const volatile void __iomem *addr)
+{
+	u64 ret = __raw_readq(addr);
+	mb();
+	return ret;
+}
+
+extern inline void writel(u32 b, volatile void __iomem *addr)
+{
+	__raw_writel(b, addr);
+	mb();
+}
+
+extern inline void writeq(u64 b, volatile void __iomem *addr)
+{
+	__raw_writeq(b, addr);
+	mb();
+}
+#endif
+
+#define ioread16be(p) be16_to_cpu(ioread16(p))
+#define ioread32be(p) be32_to_cpu(ioread32(p))
+#define iowrite16be(v,p) iowrite16(cpu_to_be16(v), (p))
+#define iowrite32be(v,p) iowrite32(cpu_to_be32(v), (p))
+
+#define inb_p		inb
+#define inw_p		inw
+#define inl_p		inl
+#define outb_p		outb
+#define outw_p		outw
+#define outl_p		outl
+#define readb_relaxed(addr)	__raw_readb(addr)
+#define readw_relaxed(addr)	__raw_readw(addr)
+#define readl_relaxed(addr)	__raw_readl(addr)
+#define readq_relaxed(addr)	__raw_readq(addr)
+#define writeb_relaxed(b, addr)	__raw_writeb(b, addr)
+#define writew_relaxed(b, addr)	__raw_writew(b, addr)
+#define writel_relaxed(b, addr)	__raw_writel(b, addr)
+#define writeq_relaxed(b, addr)	__raw_writeq(b, addr)
+
+#define mmiowb()
+
+/*
+ * String version of IO memory access ops:
+ */
+extern void memcpy_fromio(void *, const volatile void __iomem *, long);
+extern void memcpy_toio(volatile void __iomem *, const void *, long);
+extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
+
+static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
+{
+	_memset_c_io(addr, 0x0101010101010101UL * c, len);
+}
+
+#define __HAVE_ARCH_MEMSETW_IO
+static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
+{
+	_memset_c_io(addr, 0x0001000100010001UL * c, len);
+}
+
+/*
+ * String versions of in/out ops:
+ */
+extern void insb (unsigned long port, void *dst, unsigned long count);
+extern void insw (unsigned long port, void *dst, unsigned long count);
+extern void insl (unsigned long port, void *dst, unsigned long count);
+extern void outsb (unsigned long port, const void *src, unsigned long count);
+extern void outsw (unsigned long port, const void *src, unsigned long count);
+extern void outsl (unsigned long port, const void *src, unsigned long count);
+
+/*
+ * The Alpha Jensen hardware for some rather strange reason puts
+ * the RTC clock at 0x170 instead of 0x70. Probably due to some
+ * misguided idea about using 0x70 for NMI stuff.
+ *
+ * These defines will override the defaults when doing RTC queries
+ */
+
+#ifdef CONFIG_ALPHA_GENERIC
+# define RTC_PORT(x)	((x) + alpha_mv.rtc_port)
+#else
+# ifdef CONFIG_ALPHA_JENSEN
+#  define RTC_PORT(x)	(0x170+(x))
+# else
+#  define RTC_PORT(x)	(0x70 + (x))
+# endif
+#endif
+#define RTC_ALWAYS_BCD	0
+
+/*
+ * Some mucking forons use if[n]def writeq to check if platform has it.
+ * It's a bloody bad idea and we probably want ARCH_HAS_WRITEQ for them
+ * to play with; for now just use cpp anti-recursion logics and make sure
+ * that damn thing is defined and expands to itself.
+ */
+
+#define writeq writeq
+#define readq readq
+
+/*
+ * 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 /* __KERNEL__ */
+
+#endif /* __ALPHA_IO_H */