1 /* 2 * Based on arch/arm/include/asm/io.h 3 * 4 * Copyright (C) 1996-2000 Russell King 5 * Copyright (C) 2012 ARM Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 #ifndef __ASM_IO_H 20 #define __ASM_IO_H 21 22 #ifdef __KERNEL__ 23 24 #include <linux/types.h> 25 #include <linux/blk_types.h> 26 27 #include <asm/byteorder.h> 28 #include <asm/barrier.h> 29 #include <asm/pgtable.h> 30 #include <asm/early_ioremap.h> 31 32 #include <xen/xen.h> 33 34 /* 35 * Generic IO read/write. These perform native-endian accesses. 36 */ 37 static inline void __raw_writeb(u8 val, volatile void __iomem *addr) 38 { 39 asm volatile("strb %w0, [%1]" : : "r" (val), "r" (addr)); 40 } 41 42 static inline void __raw_writew(u16 val, volatile void __iomem *addr) 43 { 44 asm volatile("strh %w0, [%1]" : : "r" (val), "r" (addr)); 45 } 46 47 static inline void __raw_writel(u32 val, volatile void __iomem *addr) 48 { 49 asm volatile("str %w0, [%1]" : : "r" (val), "r" (addr)); 50 } 51 52 static inline void __raw_writeq(u64 val, volatile void __iomem *addr) 53 { 54 asm volatile("str %0, [%1]" : : "r" (val), "r" (addr)); 55 } 56 57 static inline u8 __raw_readb(const volatile void __iomem *addr) 58 { 59 u8 val; 60 asm volatile("ldrb %w0, [%1]" : "=r" (val) : "r" (addr)); 61 return val; 62 } 63 64 static inline u16 __raw_readw(const volatile void __iomem *addr) 65 { 66 u16 val; 67 asm volatile("ldrh %w0, [%1]" : "=r" (val) : "r" (addr)); 68 return val; 69 } 70 71 static inline u32 __raw_readl(const volatile void __iomem *addr) 72 { 73 u32 val; 74 asm volatile("ldr %w0, [%1]" : "=r" (val) : "r" (addr)); 75 return val; 76 } 77 78 static inline u64 __raw_readq(const volatile void __iomem *addr) 79 { 80 u64 val; 81 asm volatile("ldr %0, [%1]" : "=r" (val) : "r" (addr)); 82 return val; 83 } 84 85 /* IO barriers */ 86 #define __iormb() rmb() 87 #define __iowmb() wmb() 88 89 #define mmiowb() do { } while (0) 90 91 /* 92 * Relaxed I/O memory access primitives. These follow the Device memory 93 * ordering rules but do not guarantee any ordering relative to Normal memory 94 * accesses. 95 */ 96 #define readb_relaxed(c) ({ u8 __v = __raw_readb(c); __v; }) 97 #define readw_relaxed(c) ({ u16 __v = le16_to_cpu((__force __le16)__raw_readw(c)); __v; }) 98 #define readl_relaxed(c) ({ u32 __v = le32_to_cpu((__force __le32)__raw_readl(c)); __v; }) 99 #define readq_relaxed(c) ({ u64 __v = le64_to_cpu((__force __le64)__raw_readq(c)); __v; }) 100 101 #define writeb_relaxed(v,c) ((void)__raw_writeb((v),(c))) 102 #define writew_relaxed(v,c) ((void)__raw_writew((__force u16)cpu_to_le16(v),(c))) 103 #define writel_relaxed(v,c) ((void)__raw_writel((__force u32)cpu_to_le32(v),(c))) 104 #define writeq_relaxed(v,c) ((void)__raw_writeq((__force u64)cpu_to_le64(v),(c))) 105 106 /* 107 * I/O memory access primitives. Reads are ordered relative to any 108 * following Normal memory access. Writes are ordered relative to any prior 109 * Normal memory access. 110 */ 111 #define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; }) 112 #define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; }) 113 #define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; }) 114 #define readq(c) ({ u64 __v = readq_relaxed(c); __iormb(); __v; }) 115 116 #define writeb(v,c) ({ __iowmb(); writeb_relaxed((v),(c)); }) 117 #define writew(v,c) ({ __iowmb(); writew_relaxed((v),(c)); }) 118 #define writel(v,c) ({ __iowmb(); writel_relaxed((v),(c)); }) 119 #define writeq(v,c) ({ __iowmb(); writeq_relaxed((v),(c)); }) 120 121 /* 122 * I/O port access primitives. 123 */ 124 #define arch_has_dev_port() (1) 125 #define IO_SPACE_LIMIT (SZ_32M - 1) 126 #define PCI_IOBASE ((void __iomem *)(MODULES_VADDR - SZ_32M)) 127 128 static inline u8 inb(unsigned long addr) 129 { 130 return readb(addr + PCI_IOBASE); 131 } 132 133 static inline u16 inw(unsigned long addr) 134 { 135 return readw(addr + PCI_IOBASE); 136 } 137 138 static inline u32 inl(unsigned long addr) 139 { 140 return readl(addr + PCI_IOBASE); 141 } 142 143 static inline void outb(u8 b, unsigned long addr) 144 { 145 writeb(b, addr + PCI_IOBASE); 146 } 147 148 static inline void outw(u16 b, unsigned long addr) 149 { 150 writew(b, addr + PCI_IOBASE); 151 } 152 153 static inline void outl(u32 b, unsigned long addr) 154 { 155 writel(b, addr + PCI_IOBASE); 156 } 157 158 #define inb_p(addr) inb(addr) 159 #define inw_p(addr) inw(addr) 160 #define inl_p(addr) inl(addr) 161 162 #define outb_p(x, addr) outb((x), (addr)) 163 #define outw_p(x, addr) outw((x), (addr)) 164 #define outl_p(x, addr) outl((x), (addr)) 165 166 static inline void insb(unsigned long addr, void *buffer, int count) 167 { 168 u8 *buf = buffer; 169 while (count--) 170 *buf++ = __raw_readb(addr + PCI_IOBASE); 171 } 172 173 static inline void insw(unsigned long addr, void *buffer, int count) 174 { 175 u16 *buf = buffer; 176 while (count--) 177 *buf++ = __raw_readw(addr + PCI_IOBASE); 178 } 179 180 static inline void insl(unsigned long addr, void *buffer, int count) 181 { 182 u32 *buf = buffer; 183 while (count--) 184 *buf++ = __raw_readl(addr + PCI_IOBASE); 185 } 186 187 static inline void outsb(unsigned long addr, const void *buffer, int count) 188 { 189 const u8 *buf = buffer; 190 while (count--) 191 __raw_writeb(*buf++, addr + PCI_IOBASE); 192 } 193 194 static inline void outsw(unsigned long addr, const void *buffer, int count) 195 { 196 const u16 *buf = buffer; 197 while (count--) 198 __raw_writew(*buf++, addr + PCI_IOBASE); 199 } 200 201 static inline void outsl(unsigned long addr, const void *buffer, int count) 202 { 203 const u32 *buf = buffer; 204 while (count--) 205 __raw_writel(*buf++, addr + PCI_IOBASE); 206 } 207 208 #define insb_p(port,to,len) insb(port,to,len) 209 #define insw_p(port,to,len) insw(port,to,len) 210 #define insl_p(port,to,len) insl(port,to,len) 211 212 #define outsb_p(port,from,len) outsb(port,from,len) 213 #define outsw_p(port,from,len) outsw(port,from,len) 214 #define outsl_p(port,from,len) outsl(port,from,len) 215 216 /* 217 * String version of I/O memory access operations. 218 */ 219 extern void __memcpy_fromio(void *, const volatile void __iomem *, size_t); 220 extern void __memcpy_toio(volatile void __iomem *, const void *, size_t); 221 extern void __memset_io(volatile void __iomem *, int, size_t); 222 223 #define memset_io(c,v,l) __memset_io((c),(v),(l)) 224 #define memcpy_fromio(a,c,l) __memcpy_fromio((a),(c),(l)) 225 #define memcpy_toio(c,a,l) __memcpy_toio((c),(a),(l)) 226 227 /* 228 * I/O memory mapping functions. 229 */ 230 extern void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot); 231 extern void __iounmap(volatile void __iomem *addr); 232 extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size); 233 234 #define ioremap(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) 235 #define ioremap_nocache(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) 236 #define ioremap_wc(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL_NC)) 237 #define iounmap __iounmap 238 239 #define ARCH_HAS_IOREMAP_WC 240 #include <asm-generic/iomap.h> 241 242 /* 243 * More restrictive address range checking than the default implementation 244 * (PHYS_OFFSET and PHYS_MASK taken into account). 245 */ 246 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE 247 extern int valid_phys_addr_range(phys_addr_t addr, size_t size); 248 extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); 249 250 extern int devmem_is_allowed(unsigned long pfn); 251 252 /* 253 * Convert a physical pointer to a virtual kernel pointer for /dev/mem 254 * access 255 */ 256 #define xlate_dev_mem_ptr(p) __va(p) 257 258 /* 259 * Convert a virtual cached pointer to an uncached pointer 260 */ 261 #define xlate_dev_kmem_ptr(p) p 262 263 struct bio_vec; 264 extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, 265 const struct bio_vec *vec2); 266 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ 267 (__BIOVEC_PHYS_MERGEABLE(vec1, vec2) && \ 268 (!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))) 269 270 #endif /* __KERNEL__ */ 271 #endif /* __ASM_IO_H */ 272