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 38 static 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 72 unsigned int fastcall ioread8(void __iomem *addr) 73 { 74 IO_COND(addr, return inb(port), return readb(addr)); 75 return 0xff; 76 } 77 unsigned int fastcall ioread16(void __iomem *addr) 78 { 79 IO_COND(addr, return inw(port), return readw(addr)); 80 return 0xffff; 81 } 82 unsigned int fastcall ioread16be(void __iomem *addr) 83 { 84 IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr)); 85 return 0xffff; 86 } 87 unsigned int fastcall ioread32(void __iomem *addr) 88 { 89 IO_COND(addr, return inl(port), return readl(addr)); 90 return 0xffffffff; 91 } 92 unsigned int fastcall ioread32be(void __iomem *addr) 93 { 94 IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr)); 95 return 0xffffffff; 96 } 97 EXPORT_SYMBOL(ioread8); 98 EXPORT_SYMBOL(ioread16); 99 EXPORT_SYMBOL(ioread16be); 100 EXPORT_SYMBOL(ioread32); 101 EXPORT_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 112 113 void fastcall iowrite8(u8 val, void __iomem *addr) 114 { 115 IO_COND(addr, outb(val,port), writeb(val, addr)); 116 } 117 void fastcall iowrite16(u16 val, void __iomem *addr) 118 { 119 IO_COND(addr, outw(val,port), writew(val, addr)); 120 } 121 void fastcall iowrite16be(u16 val, void __iomem *addr) 122 { 123 IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr)); 124 } 125 void fastcall iowrite32(u32 val, void __iomem *addr) 126 { 127 IO_COND(addr, outl(val,port), writel(val, addr)); 128 } 129 void fastcall iowrite32be(u32 val, void __iomem *addr) 130 { 131 IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr)); 132 } 133 EXPORT_SYMBOL(iowrite8); 134 EXPORT_SYMBOL(iowrite16); 135 EXPORT_SYMBOL(iowrite16be); 136 EXPORT_SYMBOL(iowrite32); 137 EXPORT_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 146 static 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 } 154 static 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 } 162 static 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 173 static 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 } 180 static 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 } 187 static 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 195 196 void 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 } 200 void 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 } 204 void 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 } 208 EXPORT_SYMBOL(ioread8_rep); 209 EXPORT_SYMBOL(ioread16_rep); 210 EXPORT_SYMBOL(ioread32_rep); 211 212 void 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 } 216 void 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 } 220 void 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 } 224 EXPORT_SYMBOL(iowrite8_rep); 225 EXPORT_SYMBOL(iowrite16_rep); 226 EXPORT_SYMBOL(iowrite32_rep); 227 228 /* Create a virtual mapping cookie for an IO port range */ 229 void __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 } 235 236 void ioport_unmap(void __iomem *addr) 237 { 238 /* Nothing to do */ 239 } 240 EXPORT_SYMBOL(ioport_map); 241 EXPORT_SYMBOL(ioport_unmap); 242 243 /** 244 * pci_iomap - create a virtual mapping cookie for a PCI BAR 245 * @dev: PCI device that owns the BAR 246 * @bar: BAR number 247 * @maxlen: length of the memory to map 248 * 249 * Using this function you will get a __iomem address to your device BAR. 250 * You can access it using ioread*() and iowrite*(). These functions hide 251 * the details if this is a MMIO or PIO address space and will just do what 252 * you expect from them in the correct way. 253 * 254 * @maxlen specifies the maximum length to map. If you want to get access to 255 * the complete BAR without checking for its length first, pass %0 here. 256 * */ 257 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 258 { 259 unsigned long start = pci_resource_start(dev, bar); 260 unsigned long len = pci_resource_len(dev, bar); 261 unsigned long flags = pci_resource_flags(dev, bar); 262 263 if (!len || !start) 264 return NULL; 265 if (maxlen && len > maxlen) 266 len = maxlen; 267 if (flags & IORESOURCE_IO) 268 return ioport_map(start, len); 269 if (flags & IORESOURCE_MEM) { 270 if (flags & IORESOURCE_CACHEABLE) 271 return ioremap(start, len); 272 return ioremap_nocache(start, len); 273 } 274 /* What? */ 275 return NULL; 276 } 277 278 void pci_iounmap(struct pci_dev *dev, void __iomem * addr) 279 { 280 IO_COND(addr, /* nothing */, iounmap(addr)); 281 } 282 EXPORT_SYMBOL(pci_iomap); 283 EXPORT_SYMBOL(pci_iounmap); 284