2 * Implement the default iomap interfaces
4 * (C) Copyright 2004 Linus Torvalds
7 #include <linux/module.h>
11 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
12 * access or a MMIO access, these functions don't care. The info is
13 * encoded in the hardware mapping set up by the mapping functions
14 * (or the cookie itself, depending on implementation and hw).
16 * The generic routines don't assume any hardware mappings, and just
17 * encode the PIO/MMIO as part of the cookie. They coldly assume that
18 * the MMIO IO mappings are not in the low address range.
20 * Architectures for which this is not true can't use this generic
21 * implementation and should do their own copy.
24 #ifndef HAVE_ARCH_PIO_SIZE
26 * We encode the physical PIO addresses (0-0xffff) into the
27 * pointer by offsetting them with a constant (0x10000) and
28 * assuming that all the low addresses are always PIO. That means
29 * we can do some sanity checks on the low bits, and don't
30 * need to just take things for granted.
32 #define PIO_OFFSET 0x10000UL
33 #define PIO_MASK 0x0ffffUL
34 #define PIO_RESERVED 0x40000UL
38 * Ugly macros are a way of life.
40 #define VERIFY_PIO(port) BUG_ON((port & ~PIO_MASK) != PIO_OFFSET)
42 #define IO_COND(addr, is_pio, is_mmio) do { \
43 unsigned long port = (unsigned long __force)addr; \
44 if (port < PIO_RESERVED) { \
53 unsigned int fastcall ioread8(void __iomem *addr)
55 IO_COND(addr, return inb(port), return readb(addr));
57 unsigned int fastcall ioread16(void __iomem *addr)
59 IO_COND(addr, return inw(port), return readw(addr));
61 unsigned int fastcall ioread32(void __iomem *addr)
63 IO_COND(addr, return inl(port), return readl(addr));
65 EXPORT_SYMBOL(ioread8);
66 EXPORT_SYMBOL(ioread16);
67 EXPORT_SYMBOL(ioread32);
69 void fastcall iowrite8(u8 val, void __iomem *addr)
71 IO_COND(addr, outb(val,port), writeb(val, addr));
73 void fastcall iowrite16(u16 val, void __iomem *addr)
75 IO_COND(addr, outw(val,port), writew(val, addr));
77 void fastcall iowrite32(u32 val, void __iomem *addr)
79 IO_COND(addr, outl(val,port), writel(val, addr));
81 EXPORT_SYMBOL(iowrite8);
82 EXPORT_SYMBOL(iowrite16);
83 EXPORT_SYMBOL(iowrite32);
86 * These are the "repeat MMIO read/write" functions.
87 * Note the "__raw" accesses, since we don't want to
88 * convert to CPU byte order. We write in "IO byte
89 * order" (we also don't have IO barriers).
91 static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
93 while (--count >= 0) {
94 u8 data = __raw_readb(addr);
99 static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
101 while (--count >= 0) {
102 u16 data = __raw_readw(addr);
107 static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
109 while (--count >= 0) {
110 u32 data = __raw_readl(addr);
116 static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
118 while (--count >= 0) {
119 __raw_writeb(*src, addr);
123 static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
125 while (--count >= 0) {
126 __raw_writew(*src, addr);
130 static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
132 while (--count >= 0) {
133 __raw_writel(*src, addr);
138 void fastcall ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
140 IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
142 void fastcall ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
144 IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
146 void fastcall ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
148 IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
150 EXPORT_SYMBOL(ioread8_rep);
151 EXPORT_SYMBOL(ioread16_rep);
152 EXPORT_SYMBOL(ioread32_rep);
154 void fastcall iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
156 IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
158 void fastcall iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
160 IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
162 void fastcall iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
164 IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
166 EXPORT_SYMBOL(iowrite8_rep);
167 EXPORT_SYMBOL(iowrite16_rep);
168 EXPORT_SYMBOL(iowrite32_rep);
170 /* Create a virtual mapping cookie for an IO port range */
171 void __iomem *ioport_map(unsigned long port, unsigned int nr)
175 return (void __iomem *) (unsigned long) (port + PIO_OFFSET);
178 void ioport_unmap(void __iomem *addr)
182 EXPORT_SYMBOL(ioport_map);
183 EXPORT_SYMBOL(ioport_unmap);
185 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
186 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
188 unsigned long start = pci_resource_start(dev, bar);
189 unsigned long len = pci_resource_len(dev, bar);
190 unsigned long flags = pci_resource_flags(dev, bar);
194 if (maxlen && len > maxlen)
196 if (flags & IORESOURCE_IO)
197 return ioport_map(start, len);
198 if (flags & IORESOURCE_MEM) {
199 if (flags & IORESOURCE_CACHEABLE)
200 return ioremap(start, len);
201 return ioremap_nocache(start, len);
207 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
209 IO_COND(addr, /* nothing */, iounmap(addr));
211 EXPORT_SYMBOL(pci_iomap);
212 EXPORT_SYMBOL(pci_iounmap);