diff options
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/atomic.h | 165 | ||||
| -rw-r--r-- | include/asm-generic/io.h | 300 |
2 files changed, 465 insertions, 0 deletions
diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h new file mode 100644 index 00000000000..c99c64dc5f3 --- /dev/null +++ b/include/asm-generic/atomic.h @@ -0,0 +1,165 @@ +/* + * Generic C implementation of atomic counter operations + * Originally implemented for MN10300. + * + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#ifndef __ASM_GENERIC_ATOMIC_H +#define __ASM_GENERIC_ATOMIC_H + +#ifdef CONFIG_SMP +#error not SMP safe +#endif + +/* + * Atomic operations that C can't guarantee us. Useful for + * resource counting etc.. + */ + +#define ATOMIC_INIT(i) { (i) } + +#ifdef __KERNEL__ + +/** + * atomic_read - read atomic variable + * @v: pointer of type atomic_t + * + * Atomically reads the value of @v. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ +#define atomic_read(v) ((v)->counter) + +/** + * atomic_set - set atomic variable + * @v: pointer of type atomic_t + * @i: required value + * + * Atomically sets the value of @v to @i. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ +#define atomic_set(v, i) (((v)->counter) = (i)) + +#include <asm/system.h> + +/** + * atomic_add_return - add integer to atomic variable + * @i: integer value to add + * @v: pointer of type atomic_t + * + * Atomically adds @i to @v and returns the result + * Note that the guaranteed useful range of an atomic_t is only 24 bits. + */ +static inline int atomic_add_return(int i, atomic_t *v) +{ + unsigned long flags; + int temp; + + local_irq_save(flags); + temp = v->counter; + temp += i; + v->counter = temp; + local_irq_restore(flags); + + return temp; +} + +/** + * atomic_sub_return - subtract integer from atomic variable + * @i: integer value to subtract + * @v: pointer of type atomic_t + * + * Atomically subtracts @i from @v and returns the result + * Note that the guaranteed useful range of an atomic_t is only 24 bits. + */ +static inline int atomic_sub_return(int i, atomic_t *v) +{ + unsigned long flags; + int temp; + + local_irq_save(flags); + temp = v->counter; + temp -= i; + v->counter = temp; + local_irq_restore(flags); + + return temp; +} + +static inline int atomic_add_negative(int i, atomic_t *v) +{ + return atomic_add_return(i, v) < 0; +} + +static inline void atomic_add(int i, atomic_t *v) +{ + atomic_add_return(i, v); +} + +static inline void atomic_sub(int i, atomic_t *v) +{ + atomic_sub_return(i, v); +} + +static inline void atomic_inc(atomic_t *v) +{ + atomic_add_return(1, v); +} + +static inline void atomic_dec(atomic_t *v) +{ + atomic_sub_return(1, v); +} + +#define atomic_dec_return(v) atomic_sub_return(1, (v)) +#define atomic_inc_return(v) atomic_add_return(1, (v)) + +#define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) +#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) +#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) + +#define atomic_add_unless(v, a, u) \ +({ \ + int c, old; \ + c = atomic_read(v); \ + while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ + c = old; \ + c != (u); \ +}) + +#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) + +static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr) +{ + unsigned long flags; + + mask = ~mask; + local_irq_save(flags); + *addr &= mask; + local_irq_restore(flags); +} + +#define atomic_xchg(ptr, v) (xchg(&(ptr)->counter, (v))) +#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new))) + +#define cmpxchg_local(ptr, o, n) \ + ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\ + (unsigned long)(n), sizeof(*(ptr)))) + +#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) + +/* Assume that atomic operations are already serializing */ +#define smp_mb__before_atomic_dec() barrier() +#define smp_mb__after_atomic_dec() barrier() +#define smp_mb__before_atomic_inc() barrier() +#define smp_mb__after_atomic_inc() barrier() + +#include <asm-generic/atomic-long.h> + +#endif /* __KERNEL__ */ +#endif /* __ASM_GENERIC_ATOMIC_H */ diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h new file mode 100644 index 00000000000..bcee6365dca --- /dev/null +++ b/include/asm-generic/io.h @@ -0,0 +1,300 @@ +/* Generic I/O port emulation, based on MN10300 code + * + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#ifndef __ASM_GENERIC_IO_H +#define __ASM_GENERIC_IO_H + +#include <asm/page.h> /* I/O is all done through memory accesses */ +#include <asm/cacheflush.h> +#include <linux/types.h> + +#ifdef CONFIG_GENERIC_IOMAP +#include <asm-generic/iomap.h> +#endif + +#define mmiowb() do {} while (0) + +/*****************************************************************************/ +/* + * readX/writeX() are used to access memory mapped devices. On some + * architectures the memory mapped IO stuff needs to be accessed + * differently. On the simple architectures, we just read/write the + * memory location directly. + */ +static inline u8 __raw_readb(const volatile void __iomem *addr) +{ + return *(const volatile u8 __force *) addr; +} + +static inline u16 __raw_readw(const volatile void __iomem *addr) +{ + return *(const volatile u16 __force *) addr; +} + +static inline u32 __raw_readl(const volatile void __iomem *addr) +{ + return *(const volatile u32 __force *) addr; +} + +#define readb __raw_readb +#define readw(addr) __le16_to_cpu(__raw_readw(addr)) +#define readl(addr) __le32_to_cpu(__raw_readl(addr)) + +static inline void __raw_writeb(u8 b, volatile void __iomem *addr) +{ + *(volatile u8 __force *) addr = b; +} + +static inline void __raw_writew(u16 b, volatile void __iomem *addr) +{ + *(volatile u16 __force *) addr = b; +} + +static inline void __raw_writel(u32 b, volatile void __iomem *addr) +{ + *(volatile u32 __force *) addr = b; +} + +#define writeb __raw_writeb +#define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr) +#define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr) + +#ifdef CONFIG_64BIT +static inline u64 __raw_readq(const volatile void __iomem *addr) +{ + return *(const volatile u64 __force *) addr; +} +#define readq(addr) __le64_to_cpu(__raw_readq(addr)) + +static inline void __raw_writeq(u64 b, volatile void __iomem *addr) +{ + *(volatile u64 __force *) addr = b; +} +#define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr) +#endif + +/*****************************************************************************/ +/* + * traditional input/output functions + */ + +static inline u8 inb(unsigned long addr) +{ + return readb((volatile void __iomem *) addr); +} + +static inline u16 inw(unsigned long addr) +{ + return readw((volatile void __iomem *) addr); +} + +static inline u32 inl(unsigned long addr) +{ + return readl((volatile void __iomem *) addr); +} + +static inline void outb(u8 b, unsigned long addr) +{ + writeb(b, (volatile void __iomem *) addr); +} + +static inline void outw(u16 b, unsigned long addr) +{ + writew(b, (volatile void __iomem *) addr); +} + +static inline void outl(u32 b, unsigned long addr) +{ + writel(b, (volatile void __iomem *) addr); +} + +#define inb_p(addr) inb(addr) +#define inw_p(addr) inw(addr) +#define inl_p(addr) inl(addr) +#define outb_p(x, addr) outb((x), (addr)) +#define outw_p(x, addr) outw((x), (addr)) +#define outl_p(x, addr) outl((x), (addr)) + +static inline void insb(unsigned long addr, void *buffer, int count) +{ + if (count) { + u8 *buf = buffer; + do { + u8 x = inb(addr); + *buf++ = x; + } while (--count); + } +} + +static inline void insw(unsigned long addr, void *buffer, int count) +{ + if (count) { + u16 *buf = buffer; + do { + u16 x = inw(addr); + *buf++ = x; + } while (--count); + } +} + +static inline void insl(unsigned long addr, void *buffer, int count) +{ + if (count) { + u32 *buf = buffer; + do { + u32 x = inl(addr); + *buf++ = x; + } while (--count); + } +} + +static inline void outsb(unsigned long addr, const void *buffer, int count) +{ + if (count) { + const u8 *buf = buffer; + do { + outb(*buf++, addr); + } while (--count); + } +} + +static inline void outsw(unsigned long addr, const void *buffer, int count) +{ + if (count) { + const u16 *buf = buffer; + do { + outw(*buf++, addr); + } while (--count); + } +} + +static inline void outsl(unsigned long addr, const void *buffer, int count) +{ + if (count) { + const u32 *buf = buffer; + do { + outl(*buf++, addr); + } while (--count); + } +} + +#ifndef CONFIG_GENERIC_IOMAP +#define ioread8(addr) readb(addr) +#define ioread16(addr) readw(addr) +#define ioread32(addr) readl(addr) + +#define iowrite8(v, addr) writeb((v), (addr)) +#define iowrite16(v, addr) writew((v), (addr)) +#define iowrite32(v, addr) writel((v), (addr)) + +#define ioread8_rep(p, dst, count) \ + insb((unsigned long) (p), (dst), (count)) +#define ioread16_rep(p, dst, count) \ + insw((unsigned long) (p), (dst), (count)) +#define ioread32_rep(p, dst, count) \ + insl((unsigned long) (p), (dst), (count)) + +#define iowrite8_rep(p, src, count) \ + outsb((unsigned long) (p), (src), (count)) +#define iowrite16_rep(p, src, count) \ + outsw((unsigned long) (p), (src), (count)) +#define iowrite32_rep(p, src, count) \ + outsl((unsigned long) (p), (src), (count)) +#endif /* CONFIG_GENERIC_IOMAP */ + + +#define IO_SPACE_LIMIT 0xffffffff + +#ifdef __KERNEL__ + +#include <linux/vmalloc.h> +#define __io_virt(x) ((void __force *) (x)) + +#ifndef CONFIG_GENERIC_IOMAP +/* 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); +static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p) +{ +} +#endif /* CONFIG_GENERIC_IOMAP */ + +/* + * Change virtual addresses to physical addresses and vv. + * These are pretty trivial + */ +static inline unsigned long virt_to_phys(volatile void *address) +{ + return __pa((unsigned long)address); +} + +static inline void *phys_to_virt(unsigned long address) +{ + return __va(address); +} + +/* + * Change "struct page" to physical address. + */ +static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size) +{ + return (void __iomem*) (unsigned long)offset; +} + +#define __ioremap(offset, size, flags) ioremap(offset, size) + +#ifndef ioremap_nocache +#define ioremap_nocache ioremap +#endif + +#ifndef ioremap_wc +#define ioremap_wc ioremap_nocache +#endif + +static inline void iounmap(void *addr) +{ +} + +#ifndef CONFIG_GENERIC_IOMAP +static inline void __iomem *ioport_map(unsigned long port, unsigned int nr) +{ + return (void __iomem *) port; +} + +static inline void ioport_unmap(void __iomem *p) +{ +} +#else /* CONFIG_GENERIC_IOMAP */ +extern void __iomem *ioport_map(unsigned long port, unsigned int nr); +extern void ioport_unmap(void __iomem *p); +#endif /* CONFIG_GENERIC_IOMAP */ + +#define xlate_dev_kmem_ptr(p) p +#define xlate_dev_mem_ptr(p) ((void *) (p)) + +#ifndef virt_to_bus +static inline unsigned long virt_to_bus(volatile void *address) +{ + return ((unsigned long) address); +} + +static inline void *bus_to_virt(unsigned long address) +{ + return (void *) address; +} +#endif + +#define memset_io(a, b, c) memset(__io_virt(a), (b), (c)) +#define memcpy_fromio(a, b, c) memcpy((a), __io_virt(b), (c)) +#define memcpy_toio(a, b, c) memcpy(__io_virt(a), (b), (c)) + +#endif /* __KERNEL__ */ + +#endif /* __ASM_GENERIC_IO_H */ |