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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