233 lines
6.2 KiB
C
233 lines
6.2 KiB
C
/*
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* Implement the default iomap interfaces
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*
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* (C) Copyright 2004 Linus Torvalds
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*/
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <asm/io.h>
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/*
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* Read/write from/to an (offsettable) iomem cookie. It might be a PIO
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* access or a MMIO access, these functions don't care. The info is
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* encoded in the hardware mapping set up by the mapping functions
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* (or the cookie itself, depending on implementation and hw).
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*
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* The generic routines don't assume any hardware mappings, and just
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* encode the PIO/MMIO as part of the cookie. They coldly assume that
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* the MMIO IO mappings are not in the low address range.
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*
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* Architectures for which this is not true can't use this generic
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* implementation and should do their own copy.
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*/
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#ifndef HAVE_ARCH_PIO_SIZE
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/*
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* We encode the physical PIO addresses (0-0xffff) into the
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* pointer by offsetting them with a constant (0x10000) and
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* assuming that all the low addresses are always PIO. That means
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* we can do some sanity checks on the low bits, and don't
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* need to just take things for granted.
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*/
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#define PIO_OFFSET 0x10000UL
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#define PIO_MASK 0x0ffffUL
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#define PIO_RESERVED 0x40000UL
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#endif
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/*
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* Ugly macros are a way of life.
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*/
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#define VERIFY_PIO(port) BUG_ON((port & ~PIO_MASK) != PIO_OFFSET)
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#define IO_COND(addr, is_pio, is_mmio) do { \
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unsigned long port = (unsigned long __force)addr; \
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if (port < PIO_RESERVED) { \
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VERIFY_PIO(port); \
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port &= PIO_MASK; \
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is_pio; \
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} else { \
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is_mmio; \
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} \
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} while (0)
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unsigned int fastcall ioread8(void __iomem *addr)
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{
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IO_COND(addr, return inb(port), return readb(addr));
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}
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unsigned int fastcall ioread16(void __iomem *addr)
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{
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IO_COND(addr, return inw(port), return readw(addr));
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}
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unsigned int fastcall ioread16be(void __iomem *addr)
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{
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IO_COND(addr, return inw(port), return be16_to_cpu(__raw_readw(addr)));
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}
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unsigned int fastcall ioread32(void __iomem *addr)
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{
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IO_COND(addr, return inl(port), return readl(addr));
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}
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unsigned int fastcall ioread32be(void __iomem *addr)
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{
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IO_COND(addr, return inl(port), return be32_to_cpu(__raw_readl(addr)));
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}
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EXPORT_SYMBOL(ioread8);
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EXPORT_SYMBOL(ioread16);
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EXPORT_SYMBOL(ioread16be);
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EXPORT_SYMBOL(ioread32);
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EXPORT_SYMBOL(ioread32be);
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void fastcall iowrite8(u8 val, void __iomem *addr)
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{
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IO_COND(addr, outb(val,port), writeb(val, addr));
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}
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void fastcall iowrite16(u16 val, void __iomem *addr)
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{
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IO_COND(addr, outw(val,port), writew(val, addr));
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}
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void fastcall iowrite16be(u16 val, void __iomem *addr)
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{
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IO_COND(addr, outw(val,port), __raw_writew(cpu_to_be16(val), addr));
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}
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void fastcall iowrite32(u32 val, void __iomem *addr)
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{
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IO_COND(addr, outl(val,port), writel(val, addr));
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}
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void fastcall iowrite32be(u32 val, void __iomem *addr)
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{
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IO_COND(addr, outl(val,port), __raw_writel(cpu_to_be32(val), addr));
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}
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EXPORT_SYMBOL(iowrite8);
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EXPORT_SYMBOL(iowrite16);
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EXPORT_SYMBOL(iowrite16be);
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EXPORT_SYMBOL(iowrite32);
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EXPORT_SYMBOL(iowrite32be);
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/*
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* These are the "repeat MMIO read/write" functions.
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* Note the "__raw" accesses, since we don't want to
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* convert to CPU byte order. We write in "IO byte
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* order" (we also don't have IO barriers).
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*/
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static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
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{
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while (--count >= 0) {
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u8 data = __raw_readb(addr);
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*dst = data;
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dst++;
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}
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}
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static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
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{
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while (--count >= 0) {
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u16 data = __raw_readw(addr);
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*dst = data;
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dst++;
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}
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}
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static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
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{
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while (--count >= 0) {
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u32 data = __raw_readl(addr);
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*dst = data;
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dst++;
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}
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}
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static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
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{
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while (--count >= 0) {
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__raw_writeb(*src, addr);
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src++;
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}
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}
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static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
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{
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while (--count >= 0) {
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__raw_writew(*src, addr);
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src++;
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}
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}
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static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
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{
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while (--count >= 0) {
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__raw_writel(*src, addr);
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src++;
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}
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}
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void fastcall ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
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{
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IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
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}
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void fastcall ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
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{
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IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
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}
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void fastcall ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
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{
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IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
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}
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EXPORT_SYMBOL(ioread8_rep);
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EXPORT_SYMBOL(ioread16_rep);
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EXPORT_SYMBOL(ioread32_rep);
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void fastcall iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
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{
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IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
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}
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void fastcall iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
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{
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IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
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}
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void fastcall iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
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{
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IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
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}
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EXPORT_SYMBOL(iowrite8_rep);
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EXPORT_SYMBOL(iowrite16_rep);
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EXPORT_SYMBOL(iowrite32_rep);
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/* Create a virtual mapping cookie for an IO port range */
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void __iomem *ioport_map(unsigned long port, unsigned int nr)
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{
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if (port > PIO_MASK)
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return NULL;
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return (void __iomem *) (unsigned long) (port + PIO_OFFSET);
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}
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void ioport_unmap(void __iomem *addr)
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{
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/* Nothing to do */
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}
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EXPORT_SYMBOL(ioport_map);
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EXPORT_SYMBOL(ioport_unmap);
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/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
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void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
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{
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unsigned long start = pci_resource_start(dev, bar);
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unsigned long len = pci_resource_len(dev, bar);
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unsigned long flags = pci_resource_flags(dev, bar);
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if (!len || !start)
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return NULL;
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if (maxlen && len > maxlen)
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len = maxlen;
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if (flags & IORESOURCE_IO)
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return ioport_map(start, len);
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if (flags & IORESOURCE_MEM) {
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if (flags & IORESOURCE_CACHEABLE)
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return ioremap(start, len);
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return ioremap_nocache(start, len);
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}
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/* What? */
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return NULL;
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}
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void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
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{
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IO_COND(addr, /* nothing */, iounmap(addr));
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}
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EXPORT_SYMBOL(pci_iomap);
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EXPORT_SYMBOL(pci_iounmap);
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