1 // SPDX-License-Identifier: GPL-2.0
3 * Implement the default iomap interfaces
5 * (C) Copyright 2004 Linus Torvalds
10 #include <linux/export.h>
13 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
14 * access or a MMIO access, these functions don't care. The info is
15 * encoded in the hardware mapping set up by the mapping functions
16 * (or the cookie itself, depending on implementation and hw).
18 * The generic routines don't assume any hardware mappings, and just
19 * encode the PIO/MMIO as part of the cookie. They coldly assume that
20 * the MMIO IO mappings are not in the low address range.
22 * Architectures for which this is not true can't use this generic
23 * implementation and should do their own copy.
26 #ifndef HAVE_ARCH_PIO_SIZE
28 * We encode the physical PIO addresses (0-0xffff) into the
29 * pointer by offsetting them with a constant (0x10000) and
30 * assuming that all the low addresses are always PIO. That means
31 * we can do some sanity checks on the low bits, and don't
32 * need to just take things for granted.
34 #define PIO_OFFSET 0x10000UL
35 #define PIO_MASK 0x0ffffUL
36 #define PIO_RESERVED 0x40000UL
39 static void bad_io_access(unsigned long port, const char *access)
41 static int count = 10;
44 WARN(1, KERN_ERR "Bad IO access at port %#lx (%s)\n", port, access);
49 * Ugly macros are a way of life.
51 #define IO_COND(addr, is_pio, is_mmio) do { \
52 unsigned long port = (unsigned long __force)addr; \
53 if (port >= PIO_RESERVED) { \
55 } else if (port > PIO_OFFSET) { \
59 bad_io_access(port, #is_pio ); \
63 #define pio_read16be(port) swab16(inw(port))
64 #define pio_read32be(port) swab32(inl(port))
68 #define mmio_read16be(addr) swab16(readw(addr))
69 #define mmio_read32be(addr) swab32(readl(addr))
70 #define mmio_read64be(addr) swab64(readq(addr))
73 unsigned int ioread8(const void __iomem *addr)
75 IO_COND(addr, return inb(port), return readb(addr));
78 unsigned int ioread16(const void __iomem *addr)
80 IO_COND(addr, return inw(port), return readw(addr));
83 unsigned int ioread16be(const void __iomem *addr)
85 IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));
88 unsigned int ioread32(const void __iomem *addr)
90 IO_COND(addr, return inl(port), return readl(addr));
93 unsigned int ioread32be(const void __iomem *addr)
95 IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr));
98 EXPORT_SYMBOL(ioread8);
99 EXPORT_SYMBOL(ioread16);
100 EXPORT_SYMBOL(ioread16be);
101 EXPORT_SYMBOL(ioread32);
102 EXPORT_SYMBOL(ioread32be);
105 static u64 pio_read64_lo_hi(unsigned long port)
110 hi = inl(port + sizeof(u32));
112 return lo | (hi << 32);
115 static u64 pio_read64_hi_lo(unsigned long port)
119 hi = inl(port + sizeof(u32));
122 return lo | (hi << 32);
125 static u64 pio_read64be_lo_hi(unsigned long port)
129 lo = pio_read32be(port + sizeof(u32));
130 hi = pio_read32be(port);
132 return lo | (hi << 32);
135 static u64 pio_read64be_hi_lo(unsigned long port)
139 hi = pio_read32be(port);
140 lo = pio_read32be(port + sizeof(u32));
142 return lo | (hi << 32);
145 u64 ioread64_lo_hi(const void __iomem *addr)
147 IO_COND(addr, return pio_read64_lo_hi(port), return readq(addr));
148 return 0xffffffffffffffffULL;
151 u64 ioread64_hi_lo(const void __iomem *addr)
153 IO_COND(addr, return pio_read64_hi_lo(port), return readq(addr));
154 return 0xffffffffffffffffULL;
157 u64 ioread64be_lo_hi(const void __iomem *addr)
159 IO_COND(addr, return pio_read64be_lo_hi(port),
160 return mmio_read64be(addr));
161 return 0xffffffffffffffffULL;
164 u64 ioread64be_hi_lo(const void __iomem *addr)
166 IO_COND(addr, return pio_read64be_hi_lo(port),
167 return mmio_read64be(addr));
168 return 0xffffffffffffffffULL;
171 EXPORT_SYMBOL(ioread64_lo_hi);
172 EXPORT_SYMBOL(ioread64_hi_lo);
173 EXPORT_SYMBOL(ioread64be_lo_hi);
174 EXPORT_SYMBOL(ioread64be_hi_lo);
178 #ifndef pio_write16be
179 #define pio_write16be(val,port) outw(swab16(val),port)
180 #define pio_write32be(val,port) outl(swab32(val),port)
183 #ifndef mmio_write16be
184 #define mmio_write16be(val,port) writew(swab16(val),port)
185 #define mmio_write32be(val,port) writel(swab32(val),port)
186 #define mmio_write64be(val,port) writeq(swab64(val),port)
189 void iowrite8(u8 val, void __iomem *addr)
191 IO_COND(addr, outb(val,port), writeb(val, addr));
193 void iowrite16(u16 val, void __iomem *addr)
195 IO_COND(addr, outw(val,port), writew(val, addr));
197 void iowrite16be(u16 val, void __iomem *addr)
199 IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr));
201 void iowrite32(u32 val, void __iomem *addr)
203 IO_COND(addr, outl(val,port), writel(val, addr));
205 void iowrite32be(u32 val, void __iomem *addr)
207 IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr));
209 EXPORT_SYMBOL(iowrite8);
210 EXPORT_SYMBOL(iowrite16);
211 EXPORT_SYMBOL(iowrite16be);
212 EXPORT_SYMBOL(iowrite32);
213 EXPORT_SYMBOL(iowrite32be);
216 static void pio_write64_lo_hi(u64 val, unsigned long port)
219 outl(val >> 32, port + sizeof(u32));
222 static void pio_write64_hi_lo(u64 val, unsigned long port)
224 outl(val >> 32, port + sizeof(u32));
228 static void pio_write64be_lo_hi(u64 val, unsigned long port)
230 pio_write32be(val, port + sizeof(u32));
231 pio_write32be(val >> 32, port);
234 static void pio_write64be_hi_lo(u64 val, unsigned long port)
236 pio_write32be(val >> 32, port);
237 pio_write32be(val, port + sizeof(u32));
240 void iowrite64_lo_hi(u64 val, void __iomem *addr)
242 IO_COND(addr, pio_write64_lo_hi(val, port),
246 void iowrite64_hi_lo(u64 val, void __iomem *addr)
248 IO_COND(addr, pio_write64_hi_lo(val, port),
252 void iowrite64be_lo_hi(u64 val, void __iomem *addr)
254 IO_COND(addr, pio_write64be_lo_hi(val, port),
255 mmio_write64be(val, addr));
258 void iowrite64be_hi_lo(u64 val, void __iomem *addr)
260 IO_COND(addr, pio_write64be_hi_lo(val, port),
261 mmio_write64be(val, addr));
264 EXPORT_SYMBOL(iowrite64_lo_hi);
265 EXPORT_SYMBOL(iowrite64_hi_lo);
266 EXPORT_SYMBOL(iowrite64be_lo_hi);
267 EXPORT_SYMBOL(iowrite64be_hi_lo);
272 * These are the "repeat MMIO read/write" functions.
273 * Note the "__raw" accesses, since we don't want to
274 * convert to CPU byte order. We write in "IO byte
275 * order" (we also don't have IO barriers).
278 static inline void mmio_insb(const void __iomem *addr, u8 *dst, int count)
280 while (--count >= 0) {
281 u8 data = __raw_readb(addr);
286 static inline void mmio_insw(const void __iomem *addr, u16 *dst, int count)
288 while (--count >= 0) {
289 u16 data = __raw_readw(addr);
294 static inline void mmio_insl(const void __iomem *addr, u32 *dst, int count)
296 while (--count >= 0) {
297 u32 data = __raw_readl(addr);
305 static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
307 while (--count >= 0) {
308 __raw_writeb(*src, addr);
312 static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
314 while (--count >= 0) {
315 __raw_writew(*src, addr);
319 static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
321 while (--count >= 0) {
322 __raw_writel(*src, addr);
328 void ioread8_rep(const void __iomem *addr, void *dst, unsigned long count)
330 IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
332 void ioread16_rep(const void __iomem *addr, void *dst, unsigned long count)
334 IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
336 void ioread32_rep(const void __iomem *addr, void *dst, unsigned long count)
338 IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
340 EXPORT_SYMBOL(ioread8_rep);
341 EXPORT_SYMBOL(ioread16_rep);
342 EXPORT_SYMBOL(ioread32_rep);
344 void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
346 IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
348 void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
350 IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
352 void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
354 IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
356 EXPORT_SYMBOL(iowrite8_rep);
357 EXPORT_SYMBOL(iowrite16_rep);
358 EXPORT_SYMBOL(iowrite32_rep);
360 #ifdef CONFIG_HAS_IOPORT_MAP
361 /* Create a virtual mapping cookie for an IO port range */
362 void __iomem *ioport_map(unsigned long port, unsigned int nr)
366 return (void __iomem *) (unsigned long) (port + PIO_OFFSET);
369 void ioport_unmap(void __iomem *addr)
373 EXPORT_SYMBOL(ioport_map);
374 EXPORT_SYMBOL(ioport_unmap);
375 #endif /* CONFIG_HAS_IOPORT_MAP */
378 /* Hide the details if this is a MMIO or PIO address space and just do what
379 * you expect in the correct way. */
380 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
382 IO_COND(addr, /* nothing */, iounmap(addr));
384 EXPORT_SYMBOL(pci_iounmap);
385 #endif /* CONFIG_PCI */