1/* 2 * Implement the default iomap interfaces 3 * 4 * (C) Copyright 2004 Linus Torvalds 5 */ 6#include <linux/pci.h> 7#include <linux/io.h> 8 9#include <linux/module.h> 10 11/* 12 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO 13 * access or a MMIO access, these functions don't care. The info is 14 * encoded in the hardware mapping set up by the mapping functions 15 * (or the cookie itself, depending on implementation and hw). 16 * 17 * The generic routines don't assume any hardware mappings, and just 18 * encode the PIO/MMIO as part of the cookie. They coldly assume that 19 * the MMIO IO mappings are not in the low address range. 20 * 21 * Architectures for which this is not true can't use this generic 22 * implementation and should do their own copy. 23 */ 24 25#ifndef HAVE_ARCH_PIO_SIZE 26/* 27 * We encode the physical PIO addresses (0-0xffff) into the 28 * pointer by offsetting them with a constant (0x10000) and 29 * assuming that all the low addresses are always PIO. That means 30 * we can do some sanity checks on the low bits, and don't 31 * need to just take things for granted. 32 */ 33#define PIO_OFFSET 0x10000UL 34#define PIO_MASK 0x0ffffUL 35#define PIO_RESERVED 0x40000UL 36#endif 37 38static void bad_io_access(unsigned long port, const char *access) 39{ 40 static int count = 10; 41 if (count) { 42 count--; 43 printk(KERN_ERR "Bad IO access at port %lx (%s)\n", port, access); 44 WARN_ON(1); 45 } 46} 47 48/* 49 * Ugly macros are a way of life. 50 */ 51#define IO_COND(addr, is_pio, is_mmio) do { \ 52 unsigned long port = (unsigned long __force)addr; \ 53 if (port >= PIO_RESERVED) { \ 54 is_mmio; \ 55 } else if (port > PIO_OFFSET) { \ 56 port &= PIO_MASK; \ 57 is_pio; \ 58 } else \ 59 bad_io_access(port, #is_pio ); \ 60} while (0) 61 62#ifndef pio_read16be 63#define pio_read16be(port) swab16(inw(port)) 64#define pio_read32be(port) swab32(inl(port)) 65#endif 66 67#ifndef mmio_read16be 68#define mmio_read16be(addr) be16_to_cpu(__raw_readw(addr)) 69#define mmio_read32be(addr) be32_to_cpu(__raw_readl(addr)) 70#endif 71 72unsigned int fastcall ioread8(void __iomem *addr) 73{ 74 IO_COND(addr, return inb(port), return readb(addr)); 75 return 0xff; 76} 77unsigned int fastcall ioread16(void __iomem *addr) 78{ 79 IO_COND(addr, return inw(port), return readw(addr)); 80 return 0xffff; 81} 82unsigned int fastcall ioread16be(void __iomem *addr) 83{ 84 IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr)); 85 return 0xffff; 86} 87unsigned int fastcall ioread32(void __iomem *addr) 88{ 89 IO_COND(addr, return inl(port), return readl(addr)); 90 return 0xffffffff; 91} 92unsigned int fastcall ioread32be(void __iomem *addr) 93{ 94 IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr)); 95 return 0xffffffff; 96} 97EXPORT_SYMBOL(ioread8); 98EXPORT_SYMBOL(ioread16); 99EXPORT_SYMBOL(ioread16be); 100EXPORT_SYMBOL(ioread32); 101EXPORT_SYMBOL(ioread32be); 102 103#ifndef pio_write16be 104#define pio_write16be(val,port) outw(swab16(val),port) 105#define pio_write32be(val,port) outl(swab32(val),port) 106#endif 107 108#ifndef mmio_write16be 109#define mmio_write16be(val,port) __raw_writew(be16_to_cpu(val),port) 110#define mmio_write32be(val,port) __raw_writel(be32_to_cpu(val),port) 111#endif 112 113void fastcall iowrite8(u8 val, void __iomem *addr) 114{ 115 IO_COND(addr, outb(val,port), writeb(val, addr)); 116} 117void fastcall iowrite16(u16 val, void __iomem *addr) 118{ 119 IO_COND(addr, outw(val,port), writew(val, addr)); 120} 121void fastcall iowrite16be(u16 val, void __iomem *addr) 122{ 123 IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr)); 124} 125void fastcall iowrite32(u32 val, void __iomem *addr) 126{ 127 IO_COND(addr, outl(val,port), writel(val, addr)); 128} 129void fastcall iowrite32be(u32 val, void __iomem *addr) 130{ 131 IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr)); 132} 133EXPORT_SYMBOL(iowrite8); 134EXPORT_SYMBOL(iowrite16); 135EXPORT_SYMBOL(iowrite16be); 136EXPORT_SYMBOL(iowrite32); 137EXPORT_SYMBOL(iowrite32be); 138 139/* 140 * These are the "repeat MMIO read/write" functions. 141 * Note the "__raw" accesses, since we don't want to 142 * convert to CPU byte order. We write in "IO byte 143 * order" (we also don't have IO barriers). 144 */ 145#ifndef mmio_insb 146static inline void mmio_insb(void __iomem *addr, u8 *dst, int count) 147{ 148 while (--count >= 0) { 149 u8 data = __raw_readb(addr); 150 *dst = data; 151 dst++; 152 } 153} 154static inline void mmio_insw(void __iomem *addr, u16 *dst, int count) 155{ 156 while (--count >= 0) { 157 u16 data = __raw_readw(addr); 158 *dst = data; 159 dst++; 160 } 161} 162static inline void mmio_insl(void __iomem *addr, u32 *dst, int count) 163{ 164 while (--count >= 0) { 165 u32 data = __raw_readl(addr); 166 *dst = data; 167 dst++; 168 } 169} 170#endif 171 172#ifndef mmio_outsb 173static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count) 174{ 175 while (--count >= 0) { 176 __raw_writeb(*src, addr); 177 src++; 178 } 179} 180static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count) 181{ 182 while (--count >= 0) { 183 __raw_writew(*src, addr); 184 src++; 185 } 186} 187static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count) 188{ 189 while (--count >= 0) { 190 __raw_writel(*src, addr); 191 src++; 192 } 193} 194#endif 195 196void fastcall ioread8_rep(void __iomem *addr, void *dst, unsigned long count) 197{ 198 IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count)); 199} 200void fastcall ioread16_rep(void __iomem *addr, void *dst, unsigned long count) 201{ 202 IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count)); 203} 204void fastcall ioread32_rep(void __iomem *addr, void *dst, unsigned long count) 205{ 206 IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count)); 207} 208EXPORT_SYMBOL(ioread8_rep); 209EXPORT_SYMBOL(ioread16_rep); 210EXPORT_SYMBOL(ioread32_rep); 211 212void fastcall iowrite8_rep(void __iomem *addr, const void *src, unsigned long count) 213{ 214 IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count)); 215} 216void fastcall iowrite16_rep(void __iomem *addr, const void *src, unsigned long count) 217{ 218 IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count)); 219} 220void fastcall iowrite32_rep(void __iomem *addr, const void *src, unsigned long count) 221{ 222 IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count)); 223} 224EXPORT_SYMBOL(iowrite8_rep); 225EXPORT_SYMBOL(iowrite16_rep); 226EXPORT_SYMBOL(iowrite32_rep); 227 228/* Create a virtual mapping cookie for an IO port range */ 229void __iomem *ioport_map(unsigned long port, unsigned int nr) 230{ 231 if (port > PIO_MASK) 232 return NULL; 233 return (void __iomem *) (unsigned long) (port + PIO_OFFSET); 234} 235 236void ioport_unmap(void __iomem *addr) 237{ 238 /* Nothing to do */ 239} 240EXPORT_SYMBOL(ioport_map); 241EXPORT_SYMBOL(ioport_unmap); 242 243/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */ 244void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 245{ 246 unsigned long start = pci_resource_start(dev, bar); 247 unsigned long len = pci_resource_len(dev, bar); 248 unsigned long flags = pci_resource_flags(dev, bar); 249 250 if (!len || !start) 251 return NULL; 252 if (maxlen && len > maxlen) 253 len = maxlen; 254 if (flags & IORESOURCE_IO) 255 return ioport_map(start, len); 256 if (flags & IORESOURCE_MEM) { 257 if (flags & IORESOURCE_CACHEABLE) 258 return ioremap(start, len); 259 return ioremap_nocache(start, len); 260 } 261 /* What? */ 262 return NULL; 263} 264 265void pci_iounmap(struct pci_dev *dev, void __iomem * addr) 266{ 267 IO_COND(addr, /* nothing */, iounmap(addr)); 268} 269EXPORT_SYMBOL(pci_iomap); 270EXPORT_SYMBOL(pci_iounmap); 271