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1da177e4 LT |
1 | /* |
2 | * iomap.c - Implement iomap interface for PA-RISC | |
3 | * Copyright (c) 2004 Matthew Wilcox | |
4 | */ | |
5 | ||
6 | #include <linux/ioport.h> | |
7 | #include <linux/pci.h> | |
8 | #include <asm/io.h> | |
9 | ||
10 | /* | |
11 | * The iomap space on 32-bit PA-RISC is intended to look like this: | |
12 | * 00000000-7fffffff virtual mapped IO | |
13 | * 80000000-8fffffff ISA/EISA port space that can't be virtually mapped | |
14 | * 90000000-9fffffff Dino port space | |
15 | * a0000000-afffffff Astro port space | |
16 | * b0000000-bfffffff PAT port space | |
17 | * c0000000-cfffffff non-swapped memory IO | |
18 | * f0000000-ffffffff legacy IO memory pointers | |
19 | * | |
20 | * For the moment, here's what it looks like: | |
21 | * 80000000-8fffffff All ISA/EISA port space | |
22 | * f0000000-ffffffff legacy IO memory pointers | |
23 | * | |
24 | * On 64-bit, everything is extended, so: | |
25 | * 8000000000000000-8fffffffffffffff All ISA/EISA port space | |
26 | * f000000000000000-ffffffffffffffff legacy IO memory pointers | |
27 | */ | |
28 | ||
29 | /* | |
30 | * Technically, this should be 'if (VMALLOC_START < addr < VMALLOC_END), | |
31 | * but that's slow and we know it'll be within the first 2GB. | |
32 | */ | |
33 | #ifdef CONFIG_64BIT | |
34 | #define INDIRECT_ADDR(addr) (((unsigned long)(addr) & 1UL<<63) != 0) | |
35 | #define ADDR_TO_REGION(addr) (((unsigned long)addr >> 60) & 7) | |
36 | #define IOPORT_MAP_BASE (8UL << 60) | |
37 | #else | |
38 | #define INDIRECT_ADDR(addr) (((unsigned long)(addr) & 1UL<<31) != 0) | |
39 | #define ADDR_TO_REGION(addr) (((unsigned long)addr >> 28) & 7) | |
40 | #define IOPORT_MAP_BASE (8UL << 28) | |
41 | #endif | |
42 | ||
43 | struct iomap_ops { | |
44 | unsigned int (*read8)(void __iomem *); | |
45 | unsigned int (*read16)(void __iomem *); | |
46 | unsigned int (*read32)(void __iomem *); | |
47 | void (*write8)(u8, void __iomem *); | |
48 | void (*write16)(u16, void __iomem *); | |
49 | void (*write32)(u32, void __iomem *); | |
50 | void (*read8r)(void __iomem *, void *, unsigned long); | |
51 | void (*read16r)(void __iomem *, void *, unsigned long); | |
52 | void (*read32r)(void __iomem *, void *, unsigned long); | |
53 | void (*write8r)(void __iomem *, const void *, unsigned long); | |
54 | void (*write16r)(void __iomem *, const void *, unsigned long); | |
55 | void (*write32r)(void __iomem *, const void *, unsigned long); | |
56 | }; | |
57 | ||
58 | /* Generic ioport ops. To be replaced later by specific dino/elroy/wax code */ | |
59 | ||
60 | #define ADDR2PORT(addr) ((unsigned long __force)(addr) & 0xffffff) | |
61 | ||
62 | static unsigned int ioport_read8(void __iomem *addr) | |
63 | { | |
64 | return inb(ADDR2PORT(addr)); | |
65 | } | |
66 | ||
67 | static unsigned int ioport_read16(void __iomem *addr) | |
68 | { | |
69 | return inw(ADDR2PORT(addr)); | |
70 | } | |
71 | ||
72 | static unsigned int ioport_read32(void __iomem *addr) | |
73 | { | |
74 | return inl(ADDR2PORT(addr)); | |
75 | } | |
76 | ||
77 | static void ioport_write8(u8 datum, void __iomem *addr) | |
78 | { | |
79 | outb(datum, ADDR2PORT(addr)); | |
80 | } | |
81 | ||
82 | static void ioport_write16(u16 datum, void __iomem *addr) | |
83 | { | |
84 | outw(datum, ADDR2PORT(addr)); | |
85 | } | |
86 | ||
87 | static void ioport_write32(u32 datum, void __iomem *addr) | |
88 | { | |
89 | outl(datum, ADDR2PORT(addr)); | |
90 | } | |
91 | ||
92 | static void ioport_read8r(void __iomem *addr, void *dst, unsigned long count) | |
93 | { | |
94 | insb(ADDR2PORT(addr), dst, count); | |
95 | } | |
96 | ||
97 | static void ioport_read16r(void __iomem *addr, void *dst, unsigned long count) | |
98 | { | |
99 | insw(ADDR2PORT(addr), dst, count); | |
100 | } | |
101 | ||
102 | static void ioport_read32r(void __iomem *addr, void *dst, unsigned long count) | |
103 | { | |
104 | insl(ADDR2PORT(addr), dst, count); | |
105 | } | |
106 | ||
107 | static void ioport_write8r(void __iomem *addr, const void *s, unsigned long n) | |
108 | { | |
109 | outsb(ADDR2PORT(addr), s, n); | |
110 | } | |
111 | ||
112 | static void ioport_write16r(void __iomem *addr, const void *s, unsigned long n) | |
113 | { | |
114 | outsw(ADDR2PORT(addr), s, n); | |
115 | } | |
116 | ||
117 | static void ioport_write32r(void __iomem *addr, const void *s, unsigned long n) | |
118 | { | |
119 | outsl(ADDR2PORT(addr), s, n); | |
120 | } | |
121 | ||
122 | static const struct iomap_ops ioport_ops = { | |
123 | ioport_read8, | |
124 | ioport_read16, | |
125 | ioport_read32, | |
126 | ioport_write8, | |
127 | ioport_write16, | |
128 | ioport_write32, | |
129 | ioport_read8r, | |
130 | ioport_read16r, | |
131 | ioport_read32r, | |
132 | ioport_write8r, | |
133 | ioport_write16r, | |
134 | ioport_write32r, | |
135 | }; | |
136 | ||
137 | /* Legacy I/O memory ops */ | |
138 | ||
139 | static unsigned int iomem_read8(void __iomem *addr) | |
140 | { | |
141 | return readb(addr); | |
142 | } | |
143 | ||
144 | static unsigned int iomem_read16(void __iomem *addr) | |
145 | { | |
146 | return readw(addr); | |
147 | } | |
148 | ||
149 | static unsigned int iomem_read32(void __iomem *addr) | |
150 | { | |
151 | return readl(addr); | |
152 | } | |
153 | ||
154 | static void iomem_write8(u8 datum, void __iomem *addr) | |
155 | { | |
156 | writeb(datum, addr); | |
157 | } | |
158 | ||
159 | static void iomem_write16(u16 datum, void __iomem *addr) | |
160 | { | |
161 | writew(datum, addr); | |
162 | } | |
163 | ||
164 | static void iomem_write32(u32 datum, void __iomem *addr) | |
165 | { | |
166 | writel(datum, addr); | |
167 | } | |
168 | ||
169 | static void iomem_read8r(void __iomem *addr, void *dst, unsigned long count) | |
170 | { | |
171 | while (count--) { | |
172 | *(u8 *)dst = __raw_readb(addr); | |
173 | dst++; | |
174 | } | |
175 | } | |
176 | ||
177 | static void iomem_read16r(void __iomem *addr, void *dst, unsigned long count) | |
178 | { | |
179 | while (count--) { | |
180 | *(u16 *)dst = __raw_readw(addr); | |
181 | dst += 2; | |
182 | } | |
183 | } | |
184 | ||
185 | static void iomem_read32r(void __iomem *addr, void *dst, unsigned long count) | |
186 | { | |
187 | while (count--) { | |
188 | *(u32 *)dst = __raw_readl(addr); | |
189 | dst += 4; | |
190 | } | |
191 | } | |
192 | ||
193 | static void iomem_write8r(void __iomem *addr, const void *s, unsigned long n) | |
194 | { | |
195 | while (n--) { | |
196 | __raw_writeb(*(u8 *)s, addr); | |
197 | s++; | |
198 | } | |
199 | } | |
200 | ||
201 | static void iomem_write16r(void __iomem *addr, const void *s, unsigned long n) | |
202 | { | |
203 | while (n--) { | |
204 | __raw_writew(*(u16 *)s, addr); | |
205 | s += 2; | |
206 | } | |
207 | } | |
208 | ||
209 | static void iomem_write32r(void __iomem *addr, const void *s, unsigned long n) | |
210 | { | |
211 | while (n--) { | |
212 | __raw_writel(*(u32 *)s, addr); | |
213 | s += 4; | |
214 | } | |
215 | } | |
216 | ||
217 | static const struct iomap_ops iomem_ops = { | |
218 | iomem_read8, | |
219 | iomem_read16, | |
220 | iomem_read32, | |
221 | iomem_write8, | |
222 | iomem_write16, | |
223 | iomem_write32, | |
224 | iomem_read8r, | |
225 | iomem_read16r, | |
226 | iomem_read32r, | |
227 | iomem_write8r, | |
228 | iomem_write16r, | |
229 | iomem_write32r, | |
230 | }; | |
231 | ||
232 | const struct iomap_ops *iomap_ops[8] = { | |
233 | [0] = &ioport_ops, | |
234 | #ifdef CONFIG_DEBUG_IOREMAP | |
235 | [6] = &iomem_ops, | |
236 | #else | |
237 | [7] = &iomem_ops | |
238 | #endif | |
239 | }; | |
240 | ||
241 | ||
242 | unsigned int ioread8(void __iomem *addr) | |
243 | { | |
244 | if (unlikely(INDIRECT_ADDR(addr))) | |
245 | return iomap_ops[ADDR_TO_REGION(addr)]->read8(addr); | |
246 | return *((u8 *)addr); | |
247 | } | |
248 | ||
249 | unsigned int ioread16(void __iomem *addr) | |
250 | { | |
251 | if (unlikely(INDIRECT_ADDR(addr))) | |
252 | return iomap_ops[ADDR_TO_REGION(addr)]->read16(addr); | |
253 | return le16_to_cpup((u16 *)addr); | |
254 | } | |
255 | ||
256 | unsigned int ioread32(void __iomem *addr) | |
257 | { | |
258 | if (unlikely(INDIRECT_ADDR(addr))) | |
259 | return iomap_ops[ADDR_TO_REGION(addr)]->read32(addr); | |
260 | return le32_to_cpup((u32 *)addr); | |
261 | } | |
262 | ||
263 | void iowrite8(u8 datum, void __iomem *addr) | |
264 | { | |
265 | if (unlikely(INDIRECT_ADDR(addr))) { | |
266 | iomap_ops[ADDR_TO_REGION(addr)]->write8(datum, addr); | |
267 | } else { | |
268 | *((u8 *)addr) = datum; | |
269 | } | |
270 | } | |
271 | ||
272 | void iowrite16(u16 datum, void __iomem *addr) | |
273 | { | |
274 | if (unlikely(INDIRECT_ADDR(addr))) { | |
275 | iomap_ops[ADDR_TO_REGION(addr)]->write16(datum, addr); | |
276 | } else { | |
277 | *((u16 *)addr) = cpu_to_le16(datum); | |
278 | } | |
279 | } | |
280 | ||
281 | void iowrite32(u32 datum, void __iomem *addr) | |
282 | { | |
283 | if (unlikely(INDIRECT_ADDR(addr))) { | |
284 | iomap_ops[ADDR_TO_REGION(addr)]->write32(datum, addr); | |
285 | } else { | |
286 | *((u32 *)addr) = cpu_to_le32(datum); | |
287 | } | |
288 | } | |
289 | ||
290 | /* Repeating interfaces */ | |
291 | ||
292 | void ioread8_rep(void __iomem *addr, void *dst, unsigned long count) | |
293 | { | |
294 | if (unlikely(INDIRECT_ADDR(addr))) { | |
295 | iomap_ops[ADDR_TO_REGION(addr)]->read8r(addr, dst, count); | |
296 | } else { | |
297 | while (count--) { | |
298 | *(u8 *)dst = *(u8 *)addr; | |
299 | dst++; | |
300 | } | |
301 | } | |
302 | } | |
303 | ||
304 | void ioread16_rep(void __iomem *addr, void *dst, unsigned long count) | |
305 | { | |
306 | if (unlikely(INDIRECT_ADDR(addr))) { | |
307 | iomap_ops[ADDR_TO_REGION(addr)]->read16r(addr, dst, count); | |
308 | } else { | |
309 | while (count--) { | |
310 | *(u16 *)dst = *(u16 *)addr; | |
311 | dst += 2; | |
312 | } | |
313 | } | |
314 | } | |
315 | ||
316 | void ioread32_rep(void __iomem *addr, void *dst, unsigned long count) | |
317 | { | |
318 | if (unlikely(INDIRECT_ADDR(addr))) { | |
319 | iomap_ops[ADDR_TO_REGION(addr)]->read32r(addr, dst, count); | |
320 | } else { | |
321 | while (count--) { | |
322 | *(u32 *)dst = *(u32 *)addr; | |
323 | dst += 4; | |
324 | } | |
325 | } | |
326 | } | |
327 | ||
328 | void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count) | |
329 | { | |
330 | if (unlikely(INDIRECT_ADDR(addr))) { | |
331 | iomap_ops[ADDR_TO_REGION(addr)]->write8r(addr, src, count); | |
332 | } else { | |
333 | while (count--) { | |
334 | *(u8 *)addr = *(u8 *)src; | |
335 | src++; | |
336 | } | |
337 | } | |
338 | } | |
339 | ||
340 | void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count) | |
341 | { | |
342 | if (unlikely(INDIRECT_ADDR(addr))) { | |
343 | iomap_ops[ADDR_TO_REGION(addr)]->write16r(addr, src, count); | |
344 | } else { | |
345 | while (count--) { | |
346 | *(u16 *)addr = *(u16 *)src; | |
347 | src += 2; | |
348 | } | |
349 | } | |
350 | } | |
351 | ||
352 | void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count) | |
353 | { | |
354 | if (unlikely(INDIRECT_ADDR(addr))) { | |
355 | iomap_ops[ADDR_TO_REGION(addr)]->write32r(addr, src, count); | |
356 | } else { | |
357 | while (count--) { | |
358 | *(u32 *)addr = *(u32 *)src; | |
359 | src += 4; | |
360 | } | |
361 | } | |
362 | } | |
363 | ||
364 | /* Mapping interfaces */ | |
365 | ||
366 | void __iomem *ioport_map(unsigned long port, unsigned int nr) | |
367 | { | |
368 | return (void __iomem *)(IOPORT_MAP_BASE | port); | |
369 | } | |
370 | ||
371 | void ioport_unmap(void __iomem *addr) | |
372 | { | |
373 | if (!INDIRECT_ADDR(addr)) { | |
374 | iounmap(addr); | |
375 | } | |
376 | } | |
377 | ||
378 | /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */ | |
379 | void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) | |
380 | { | |
381 | unsigned long start = pci_resource_start(dev, bar); | |
382 | unsigned long len = pci_resource_len(dev, bar); | |
383 | unsigned long flags = pci_resource_flags(dev, bar); | |
384 | ||
385 | if (!len || !start) | |
386 | return NULL; | |
387 | if (maxlen && len > maxlen) | |
388 | len = maxlen; | |
389 | if (flags & IORESOURCE_IO) | |
390 | return ioport_map(start, len); | |
391 | if (flags & IORESOURCE_MEM) { | |
392 | if (flags & IORESOURCE_CACHEABLE) | |
393 | return ioremap(start, len); | |
394 | return ioremap_nocache(start, len); | |
395 | } | |
396 | /* What? */ | |
397 | return NULL; | |
398 | } | |
399 | ||
400 | void pci_iounmap(struct pci_dev *dev, void __iomem * addr) | |
401 | { | |
402 | if (!INDIRECT_ADDR(addr)) { | |
403 | iounmap(addr); | |
404 | } | |
405 | } | |
406 | ||
407 | EXPORT_SYMBOL(ioread8); | |
408 | EXPORT_SYMBOL(ioread16); | |
409 | EXPORT_SYMBOL(ioread32); | |
410 | EXPORT_SYMBOL(iowrite8); | |
411 | EXPORT_SYMBOL(iowrite16); | |
412 | EXPORT_SYMBOL(iowrite32); | |
413 | EXPORT_SYMBOL(ioread8_rep); | |
414 | EXPORT_SYMBOL(ioread16_rep); | |
415 | EXPORT_SYMBOL(ioread32_rep); | |
416 | EXPORT_SYMBOL(iowrite8_rep); | |
417 | EXPORT_SYMBOL(iowrite16_rep); | |
418 | EXPORT_SYMBOL(iowrite32_rep); | |
419 | EXPORT_SYMBOL(ioport_map); | |
420 | EXPORT_SYMBOL(ioport_unmap); | |
421 | EXPORT_SYMBOL(pci_iomap); | |
422 | EXPORT_SYMBOL(pci_iounmap); |