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Linux/lib/iomap.c

  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/export.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                 WARN(1, KERN_ERR "Bad IO access at port %#lx (%s)\n", port, access);
 44         }
 45 }
 46 
 47 /*
 48  * Ugly macros are a way of life.
 49  */
 50 #define IO_COND(addr, is_pio, is_mmio) do {                     \
 51         unsigned long port = (unsigned long __force)addr;       \
 52         if (port >= PIO_RESERVED) {                             \
 53                 is_mmio;                                        \
 54         } else if (port > PIO_OFFSET) {                         \
 55                 port &= PIO_MASK;                               \
 56                 is_pio;                                         \
 57         } else                                                  \
 58                 bad_io_access(port, #is_pio );                  \
 59 } while (0)
 60 
 61 #ifndef pio_read16be
 62 #define pio_read16be(port) swab16(inw(port))
 63 #define pio_read32be(port) swab32(inl(port))
 64 #endif
 65 
 66 #ifndef mmio_read16be
 67 #define mmio_read16be(addr) be16_to_cpu(__raw_readw(addr))
 68 #define mmio_read32be(addr) be32_to_cpu(__raw_readl(addr))
 69 #endif
 70 
 71 unsigned int ioread8(void __iomem *addr)
 72 {
 73         IO_COND(addr, return inb(port), return readb(addr));
 74         return 0xff;
 75 }
 76 unsigned int ioread16(void __iomem *addr)
 77 {
 78         IO_COND(addr, return inw(port), return readw(addr));
 79         return 0xffff;
 80 }
 81 unsigned int ioread16be(void __iomem *addr)
 82 {
 83         IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));
 84         return 0xffff;
 85 }
 86 unsigned int ioread32(void __iomem *addr)
 87 {
 88         IO_COND(addr, return inl(port), return readl(addr));
 89         return 0xffffffff;
 90 }
 91 unsigned int ioread32be(void __iomem *addr)
 92 {
 93         IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr));
 94         return 0xffffffff;
 95 }
 96 EXPORT_SYMBOL(ioread8);
 97 EXPORT_SYMBOL(ioread16);
 98 EXPORT_SYMBOL(ioread16be);
 99 EXPORT_SYMBOL(ioread32);
100 EXPORT_SYMBOL(ioread32be);
101 
102 #ifndef pio_write16be
103 #define pio_write16be(val,port) outw(swab16(val),port)
104 #define pio_write32be(val,port) outl(swab32(val),port)
105 #endif
106 
107 #ifndef mmio_write16be
108 #define mmio_write16be(val,port) __raw_writew(be16_to_cpu(val),port)
109 #define mmio_write32be(val,port) __raw_writel(be32_to_cpu(val),port)
110 #endif
111 
112 void iowrite8(u8 val, void __iomem *addr)
113 {
114         IO_COND(addr, outb(val,port), writeb(val, addr));
115 }
116 void iowrite16(u16 val, void __iomem *addr)
117 {
118         IO_COND(addr, outw(val,port), writew(val, addr));
119 }
120 void iowrite16be(u16 val, void __iomem *addr)
121 {
122         IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr));
123 }
124 void iowrite32(u32 val, void __iomem *addr)
125 {
126         IO_COND(addr, outl(val,port), writel(val, addr));
127 }
128 void iowrite32be(u32 val, void __iomem *addr)
129 {
130         IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr));
131 }
132 EXPORT_SYMBOL(iowrite8);
133 EXPORT_SYMBOL(iowrite16);
134 EXPORT_SYMBOL(iowrite16be);
135 EXPORT_SYMBOL(iowrite32);
136 EXPORT_SYMBOL(iowrite32be);
137 
138 /*
139  * These are the "repeat MMIO read/write" functions.
140  * Note the "__raw" accesses, since we don't want to
141  * convert to CPU byte order. We write in "IO byte
142  * order" (we also don't have IO barriers).
143  */
144 #ifndef mmio_insb
145 static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
146 {
147         while (--count >= 0) {
148                 u8 data = __raw_readb(addr);
149                 *dst = data;
150                 dst++;
151         }
152 }
153 static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
154 {
155         while (--count >= 0) {
156                 u16 data = __raw_readw(addr);
157                 *dst = data;
158                 dst++;
159         }
160 }
161 static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
162 {
163         while (--count >= 0) {
164                 u32 data = __raw_readl(addr);
165                 *dst = data;
166                 dst++;
167         }
168 }
169 #endif
170 
171 #ifndef mmio_outsb
172 static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
173 {
174         while (--count >= 0) {
175                 __raw_writeb(*src, addr);
176                 src++;
177         }
178 }
179 static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
180 {
181         while (--count >= 0) {
182                 __raw_writew(*src, addr);
183                 src++;
184         }
185 }
186 static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
187 {
188         while (--count >= 0) {
189                 __raw_writel(*src, addr);
190                 src++;
191         }
192 }
193 #endif
194 
195 void ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
196 {
197         IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
198 }
199 void ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
200 {
201         IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
202 }
203 void ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
204 {
205         IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
206 }
207 EXPORT_SYMBOL(ioread8_rep);
208 EXPORT_SYMBOL(ioread16_rep);
209 EXPORT_SYMBOL(ioread32_rep);
210 
211 void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
212 {
213         IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
214 }
215 void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
216 {
217         IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
218 }
219 void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
220 {
221         IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
222 }
223 EXPORT_SYMBOL(iowrite8_rep);
224 EXPORT_SYMBOL(iowrite16_rep);
225 EXPORT_SYMBOL(iowrite32_rep);
226 
227 #ifdef CONFIG_HAS_IOPORT_MAP
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 #endif /* CONFIG_HAS_IOPORT_MAP */
243 
244 #ifdef CONFIG_PCI
245 /* Hide the details if this is a MMIO or PIO address space and just do what
246  * you expect in the correct way. */
247 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
248 {
249         IO_COND(addr, /* nothing */, iounmap(addr));
250 }
251 EXPORT_SYMBOL(pci_iounmap);
252 #endif /* CONFIG_PCI */
253 

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