1 /* 2 * Implement the default iomap interfaces 3 * 4 * (C) Copyright 2004 Linus Torvalds 5 */ 6 #include <linux/pci.h> 7 #include <linux/module.h> 8 #include <asm/io.h> 9 10 /* 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). 15 * 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. 19 * 20 * Architectures for which this is not true can't use this generic 21 * implementation and should do their own copy. 22 */ 23 24 #ifndef HAVE_ARCH_PIO_SIZE 25 /* 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. 31 */ 32 #define PIO_OFFSET 0x10000UL 33 #define PIO_MASK 0x0ffffUL 34 #define PIO_RESERVED 0x40000UL 35 #endif 36 37 /* 38 * Ugly macros are a way of life. 39 */ 40 #define VERIFY_PIO(port) BUG_ON((port & ~PIO_MASK) != PIO_OFFSET) 41 42 #define IO_COND(addr, is_pio, is_mmio) do { \ 43 unsigned long port = (unsigned long __force)addr; \ 44 if (port < PIO_RESERVED) { \ 45 VERIFY_PIO(port); \ 46 port &= PIO_MASK; \ 47 is_pio; \ 48 } else { \ 49 is_mmio; \ 50 } \ 51 } while (0) 52 53 unsigned int fastcall ioread8(void __iomem *addr) 54 { 55 IO_COND(addr, return inb(port), return readb(addr)); 56 } 57 unsigned int fastcall ioread16(void __iomem *addr) 58 { 59 IO_COND(addr, return inw(port), return readw(addr)); 60 } 61 unsigned int fastcall ioread16be(void __iomem *addr) 62 { 63 IO_COND(addr, return inw(port), return be16_to_cpu(__raw_readw(addr))); 64 } 65 unsigned int fastcall ioread32(void __iomem *addr) 66 { 67 IO_COND(addr, return inl(port), return readl(addr)); 68 } 69 unsigned int fastcall ioread32be(void __iomem *addr) 70 { 71 IO_COND(addr, return inl(port), return be32_to_cpu(__raw_readl(addr))); 72 } 73 EXPORT_SYMBOL(ioread8); 74 EXPORT_SYMBOL(ioread16); 75 EXPORT_SYMBOL(ioread16be); 76 EXPORT_SYMBOL(ioread32); 77 EXPORT_SYMBOL(ioread32be); 78 79 void fastcall iowrite8(u8 val, void __iomem *addr) 80 { 81 IO_COND(addr, outb(val,port), writeb(val, addr)); 82 } 83 void fastcall iowrite16(u16 val, void __iomem *addr) 84 { 85 IO_COND(addr, outw(val,port), writew(val, addr)); 86 } 87 void fastcall iowrite16be(u16 val, void __iomem *addr) 88 { 89 IO_COND(addr, outw(val,port), __raw_writew(cpu_to_be16(val), addr)); 90 } 91 void fastcall iowrite32(u32 val, void __iomem *addr) 92 { 93 IO_COND(addr, outl(val,port), writel(val, addr)); 94 } 95 void fastcall iowrite32be(u32 val, void __iomem *addr) 96 { 97 IO_COND(addr, outl(val,port), __raw_writel(cpu_to_be32(val), addr)); 98 } 99 EXPORT_SYMBOL(iowrite8); 100 EXPORT_SYMBOL(iowrite16); 101 EXPORT_SYMBOL(iowrite16be); 102 EXPORT_SYMBOL(iowrite32); 103 EXPORT_SYMBOL(iowrite32be); 104 105 /* 106 * These are the "repeat MMIO read/write" functions. 107 * Note the "__raw" accesses, since we don't want to 108 * convert to CPU byte order. We write in "IO byte 109 * order" (we also don't have IO barriers). 110 */ 111 static inline void mmio_insb(void __iomem *addr, u8 *dst, int count) 112 { 113 while (--count >= 0) { 114 u8 data = __raw_readb(addr); 115 *dst = data; 116 dst++; 117 } 118 } 119 static inline void mmio_insw(void __iomem *addr, u16 *dst, int count) 120 { 121 while (--count >= 0) { 122 u16 data = __raw_readw(addr); 123 *dst = data; 124 dst++; 125 } 126 } 127 static inline void mmio_insl(void __iomem *addr, u32 *dst, int count) 128 { 129 while (--count >= 0) { 130 u32 data = __raw_readl(addr); 131 *dst = data; 132 dst++; 133 } 134 } 135 136 static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count) 137 { 138 while (--count >= 0) { 139 __raw_writeb(*src, addr); 140 src++; 141 } 142 } 143 static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count) 144 { 145 while (--count >= 0) { 146 __raw_writew(*src, addr); 147 src++; 148 } 149 } 150 static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count) 151 { 152 while (--count >= 0) { 153 __raw_writel(*src, addr); 154 src++; 155 } 156 } 157 158 void fastcall ioread8_rep(void __iomem *addr, void *dst, unsigned long count) 159 { 160 IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count)); 161 } 162 void fastcall ioread16_rep(void __iomem *addr, void *dst, unsigned long count) 163 { 164 IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count)); 165 } 166 void fastcall ioread32_rep(void __iomem *addr, void *dst, unsigned long count) 167 { 168 IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count)); 169 } 170 EXPORT_SYMBOL(ioread8_rep); 171 EXPORT_SYMBOL(ioread16_rep); 172 EXPORT_SYMBOL(ioread32_rep); 173 174 void fastcall iowrite8_rep(void __iomem *addr, const void *src, unsigned long count) 175 { 176 IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count)); 177 } 178 void fastcall iowrite16_rep(void __iomem *addr, const void *src, unsigned long count) 179 { 180 IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count)); 181 } 182 void fastcall iowrite32_rep(void __iomem *addr, const void *src, unsigned long count) 183 { 184 IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count)); 185 } 186 EXPORT_SYMBOL(iowrite8_rep); 187 EXPORT_SYMBOL(iowrite16_rep); 188 EXPORT_SYMBOL(iowrite32_rep); 189 190 /* Create a virtual mapping cookie for an IO port range */ 191 void __iomem *ioport_map(unsigned long port, unsigned int nr) 192 { 193 if (port > PIO_MASK) 194 return NULL; 195 return (void __iomem *) (unsigned long) (port + PIO_OFFSET); 196 } 197 198 void ioport_unmap(void __iomem *addr) 199 { 200 /* Nothing to do */ 201 } 202 EXPORT_SYMBOL(ioport_map); 203 EXPORT_SYMBOL(ioport_unmap); 204 205 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */ 206 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) 207 { 208 unsigned long start = pci_resource_start(dev, bar); 209 unsigned long len = pci_resource_len(dev, bar); 210 unsigned long flags = pci_resource_flags(dev, bar); 211 212 if (!len || !start) 213 return NULL; 214 if (maxlen && len > maxlen) 215 len = maxlen; 216 if (flags & IORESOURCE_IO) 217 return ioport_map(start, len); 218 if (flags & IORESOURCE_MEM) { 219 if (flags & IORESOURCE_CACHEABLE) 220 return ioremap(start, len); 221 return ioremap_nocache(start, len); 222 } 223 /* What? */ 224 return NULL; 225 } 226 227 void pci_iounmap(struct pci_dev *dev, void __iomem * addr) 228 { 229 IO_COND(addr, /* nothing */, iounmap(addr)); 230 } 231 EXPORT_SYMBOL(pci_iomap); 232 EXPORT_SYMBOL(pci_iounmap); 233