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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Implement the default iomap interfaces
3 *
4 * (C) Copyright 2004 Linus Torvalds
5 */
6#include <linux/pci.h>
Tejun Heo9ac78492007-01-20 16:00:26 +09007#include <linux/io.h>
8
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
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
Linus Torvalds6cbf0c72007-05-04 20:44:23 -070038static void bad_io_access(unsigned long port, const char *access)
39{
40 static int count = 10;
41 if (count) {
42 count--;
43 printk(KERN_ERR "Bad IO access at port %lx (%s)\n", port, access);
44 WARN_ON(1);
45 }
46}
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048/*
49 * Ugly macros are a way of life.
50 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define IO_COND(addr, is_pio, is_mmio) do { \
52 unsigned long port = (unsigned long __force)addr; \
Linus Torvalds6cbf0c72007-05-04 20:44:23 -070053 if (port >= PIO_RESERVED) { \
54 is_mmio; \
55 } else if (port > PIO_OFFSET) { \
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 port &= PIO_MASK; \
57 is_pio; \
Linus Torvalds6cbf0c72007-05-04 20:44:23 -070058 } else \
59 bad_io_access(port, #is_pio ); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070060} while (0)
61
Linus Torvalds34ba8a52006-11-11 17:24:46 +110062#ifndef pio_read16be
63#define pio_read16be(port) swab16(inw(port))
64#define pio_read32be(port) swab32(inl(port))
65#endif
66
67#ifndef mmio_read16be
68#define mmio_read16be(addr) be16_to_cpu(__raw_readw(addr))
69#define mmio_read32be(addr) be32_to_cpu(__raw_readl(addr))
70#endif
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072unsigned int fastcall ioread8(void __iomem *addr)
73{
74 IO_COND(addr, return inb(port), return readb(addr));
Linus Torvalds6cbf0c72007-05-04 20:44:23 -070075 return 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77unsigned int fastcall ioread16(void __iomem *addr)
78{
79 IO_COND(addr, return inw(port), return readw(addr));
Linus Torvalds6cbf0c72007-05-04 20:44:23 -070080 return 0xffff;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081}
James Bottomleydae409a2005-04-16 15:25:54 -070082unsigned int fastcall ioread16be(void __iomem *addr)
83{
Linus Torvalds34ba8a52006-11-11 17:24:46 +110084 IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));
Linus Torvalds6cbf0c72007-05-04 20:44:23 -070085 return 0xffff;
James Bottomleydae409a2005-04-16 15:25:54 -070086}
Linus Torvalds1da177e2005-04-16 15:20:36 -070087unsigned int fastcall ioread32(void __iomem *addr)
88{
89 IO_COND(addr, return inl(port), return readl(addr));
Linus Torvalds6cbf0c72007-05-04 20:44:23 -070090 return 0xffffffff;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
James Bottomleydae409a2005-04-16 15:25:54 -070092unsigned int fastcall ioread32be(void __iomem *addr)
93{
Linus Torvalds34ba8a52006-11-11 17:24:46 +110094 IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr));
Linus Torvalds6cbf0c72007-05-04 20:44:23 -070095 return 0xffffffff;
James Bottomleydae409a2005-04-16 15:25:54 -070096}
Linus Torvalds1da177e2005-04-16 15:20:36 -070097EXPORT_SYMBOL(ioread8);
98EXPORT_SYMBOL(ioread16);
James Bottomleydae409a2005-04-16 15:25:54 -070099EXPORT_SYMBOL(ioread16be);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100EXPORT_SYMBOL(ioread32);
James Bottomleydae409a2005-04-16 15:25:54 -0700101EXPORT_SYMBOL(ioread32be);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Linus Torvalds34ba8a52006-11-11 17:24:46 +1100103#ifndef pio_write16be
104#define pio_write16be(val,port) outw(swab16(val),port)
105#define pio_write32be(val,port) outl(swab32(val),port)
106#endif
107
108#ifndef mmio_write16be
109#define mmio_write16be(val,port) __raw_writew(be16_to_cpu(val),port)
110#define mmio_write32be(val,port) __raw_writel(be32_to_cpu(val),port)
111#endif
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113void fastcall iowrite8(u8 val, void __iomem *addr)
114{
115 IO_COND(addr, outb(val,port), writeb(val, addr));
116}
117void fastcall iowrite16(u16 val, void __iomem *addr)
118{
119 IO_COND(addr, outw(val,port), writew(val, addr));
120}
James Bottomleydae409a2005-04-16 15:25:54 -0700121void fastcall iowrite16be(u16 val, void __iomem *addr)
122{
Linus Torvalds34ba8a52006-11-11 17:24:46 +1100123 IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr));
James Bottomleydae409a2005-04-16 15:25:54 -0700124}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125void fastcall iowrite32(u32 val, void __iomem *addr)
126{
127 IO_COND(addr, outl(val,port), writel(val, addr));
128}
James Bottomleydae409a2005-04-16 15:25:54 -0700129void fastcall iowrite32be(u32 val, void __iomem *addr)
130{
Linus Torvalds34ba8a52006-11-11 17:24:46 +1100131 IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr));
James Bottomleydae409a2005-04-16 15:25:54 -0700132}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133EXPORT_SYMBOL(iowrite8);
134EXPORT_SYMBOL(iowrite16);
James Bottomleydae409a2005-04-16 15:25:54 -0700135EXPORT_SYMBOL(iowrite16be);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136EXPORT_SYMBOL(iowrite32);
James Bottomleydae409a2005-04-16 15:25:54 -0700137EXPORT_SYMBOL(iowrite32be);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139/*
140 * These are the "repeat MMIO read/write" functions.
141 * Note the "__raw" accesses, since we don't want to
142 * convert to CPU byte order. We write in "IO byte
143 * order" (we also don't have IO barriers).
144 */
Linus Torvalds34ba8a52006-11-11 17:24:46 +1100145#ifndef mmio_insb
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
147{
148 while (--count >= 0) {
149 u8 data = __raw_readb(addr);
150 *dst = data;
151 dst++;
152 }
153}
154static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
155{
156 while (--count >= 0) {
157 u16 data = __raw_readw(addr);
158 *dst = data;
159 dst++;
160 }
161}
162static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
163{
164 while (--count >= 0) {
165 u32 data = __raw_readl(addr);
166 *dst = data;
167 dst++;
168 }
169}
Linus Torvalds34ba8a52006-11-11 17:24:46 +1100170#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Linus Torvalds34ba8a52006-11-11 17:24:46 +1100172#ifndef mmio_outsb
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
174{
175 while (--count >= 0) {
176 __raw_writeb(*src, addr);
177 src++;
178 }
179}
180static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
181{
182 while (--count >= 0) {
183 __raw_writew(*src, addr);
184 src++;
185 }
186}
187static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
188{
189 while (--count >= 0) {
190 __raw_writel(*src, addr);
191 src++;
192 }
193}
Linus Torvalds34ba8a52006-11-11 17:24:46 +1100194#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196void fastcall ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
197{
198 IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
199}
200void fastcall ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
201{
202 IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
203}
204void fastcall ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
205{
206 IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
207}
208EXPORT_SYMBOL(ioread8_rep);
209EXPORT_SYMBOL(ioread16_rep);
210EXPORT_SYMBOL(ioread32_rep);
211
212void fastcall iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
213{
214 IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
215}
216void fastcall iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
217{
218 IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
219}
220void fastcall iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
221{
222 IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
223}
224EXPORT_SYMBOL(iowrite8_rep);
225EXPORT_SYMBOL(iowrite16_rep);
226EXPORT_SYMBOL(iowrite32_rep);
227
228/* Create a virtual mapping cookie for an IO port range */
229void __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
236void ioport_unmap(void __iomem *addr)
237{
238 /* Nothing to do */
239}
240EXPORT_SYMBOL(ioport_map);
241EXPORT_SYMBOL(ioport_unmap);
242
Rolf Eike Beer5ca24812007-07-19 17:48:44 -0700243/**
244 * pci_iomap - create a virtual mapping cookie for a PCI BAR
245 * @dev: PCI device that owns the BAR
246 * @bar: BAR number
247 * @maxlen: length of the memory to map
248 *
249 * Using this function you will get a __iomem address to your device BAR.
250 * You can access it using ioread*() and iowrite*(). These functions hide
251 * the details if this is a MMIO or PIO address space and will just do what
252 * you expect from them in the correct way.
253 *
254 * @maxlen specifies the maximum length to map. If you want to get access to
255 * the complete BAR without checking for its length first, pass %0 here.
256 * */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
258{
259 unsigned long start = pci_resource_start(dev, bar);
260 unsigned long len = pci_resource_len(dev, bar);
261 unsigned long flags = pci_resource_flags(dev, bar);
262
263 if (!len || !start)
264 return NULL;
265 if (maxlen && len > maxlen)
266 len = maxlen;
267 if (flags & IORESOURCE_IO)
268 return ioport_map(start, len);
269 if (flags & IORESOURCE_MEM) {
270 if (flags & IORESOURCE_CACHEABLE)
271 return ioremap(start, len);
272 return ioremap_nocache(start, len);
273 }
274 /* What? */
275 return NULL;
276}
277
278void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
279{
280 IO_COND(addr, /* nothing */, iounmap(addr));
281}
282EXPORT_SYMBOL(pci_iomap);
283EXPORT_SYMBOL(pci_iounmap);