2 * Implement the default iomap interfaces
4 * (C) Copyright 2004 Linus Torvalds
5 * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org>
6 * (C) Copyright 2007 MIPS Technologies, Inc.
7 * written by Ralf Baechle <ralf@linux-mips.org>
10 #include <linux/module.h>
14 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
15 * access or a MMIO access, these functions don't care. The info is
16 * encoded in the hardware mapping set up by the mapping functions
17 * (or the cookie itself, depending on implementation and hw).
19 * The generic routines don't assume any hardware mappings, and just
20 * encode the PIO/MMIO as part of the cookie. They coldly assume that
21 * the MMIO IO mappings are not in the low address range.
23 * Architectures for which this is not true can't use this generic
24 * implementation and should do their own copy.
27 #define PIO_MASK 0x0ffffUL
29 unsigned int ioread8(void __iomem *addr)
34 EXPORT_SYMBOL(ioread8);
36 unsigned int ioread16(void __iomem *addr)
41 EXPORT_SYMBOL(ioread16);
43 unsigned int ioread16be(void __iomem *addr)
45 return be16_to_cpu(__raw_readw(addr));
48 EXPORT_SYMBOL(ioread16be);
50 unsigned int ioread32(void __iomem *addr)
55 EXPORT_SYMBOL(ioread32);
57 unsigned int ioread32be(void __iomem *addr)
59 return be32_to_cpu(__raw_readl(addr));
62 EXPORT_SYMBOL(ioread32be);
64 void iowrite8(u8 val, void __iomem *addr)
69 EXPORT_SYMBOL(iowrite8);
71 void iowrite16(u16 val, void __iomem *addr)
76 EXPORT_SYMBOL(iowrite16);
78 void iowrite16be(u16 val, void __iomem *addr)
80 __raw_writew(cpu_to_be16(val), addr);
83 EXPORT_SYMBOL(iowrite16be);
85 void iowrite32(u32 val, void __iomem *addr)
90 EXPORT_SYMBOL(iowrite32);
92 void iowrite32be(u32 val, void __iomem *addr)
94 __raw_writel(cpu_to_be32(val), addr);
97 EXPORT_SYMBOL(iowrite32be);
100 * These are the "repeat MMIO read/write" functions.
101 * Note the "__raw" accesses, since we don't want to
102 * convert to CPU byte order. We write in "IO byte
103 * order" (we also don't have IO barriers).
105 static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
107 while (--count >= 0) {
108 u8 data = __raw_readb(addr);
114 static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
116 while (--count >= 0) {
117 u16 data = __raw_readw(addr);
123 static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
125 while (--count >= 0) {
126 u32 data = __raw_readl(addr);
132 static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
134 while (--count >= 0) {
135 __raw_writeb(*src, addr);
140 static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
142 while (--count >= 0) {
143 __raw_writew(*src, addr);
148 static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
150 while (--count >= 0) {
151 __raw_writel(*src, addr);
156 void ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
158 mmio_insb(addr, dst, count);
161 EXPORT_SYMBOL(ioread8_rep);
163 void ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
165 mmio_insw(addr, dst, count);
168 EXPORT_SYMBOL(ioread16_rep);
170 void ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
172 mmio_insl(addr, dst, count);
175 EXPORT_SYMBOL(ioread32_rep);
177 void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
179 mmio_outsb(addr, src, count);
182 EXPORT_SYMBOL(iowrite8_rep);
184 void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
186 mmio_outsw(addr, src, count);
189 EXPORT_SYMBOL(iowrite16_rep);
191 void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
193 mmio_outsl(addr, src, count);
196 EXPORT_SYMBOL(iowrite32_rep);
199 * Create a virtual mapping cookie for an IO port range
201 * This uses the same mapping are as the in/out family which has to be setup
202 * by the platform initialization code.
204 * Just to make matters somewhat more interesting on MIPS systems with
205 * multiple host bridge each will have it's own ioport address space.
207 static void __iomem *ioport_map_legacy(unsigned long port, unsigned int nr)
209 return (void __iomem *) (mips_io_port_base + port);
212 void __iomem *ioport_map(unsigned long port, unsigned int nr)
217 return ioport_map_legacy(port, nr);
220 EXPORT_SYMBOL(ioport_map);
222 void ioport_unmap(void __iomem *addr)
227 EXPORT_SYMBOL(ioport_unmap);