tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Implement the default iomap interfaces
3 *
4 * (C) Copyright 2004 Linus Torvalds
5 */
6#include <linux/pci.h>
7#include <linux/module.h>
8#include <asm/io.h>
9
10/*
11 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
12 * access or a MMIO access, these functions don't care. The info is
13 * encoded in the hardware mapping set up by the mapping functions
14 * (or the cookie itself, depending on implementation and hw).
15 *
16 * The generic routines don't assume any hardware mappings, and just
17 * encode the PIO/MMIO as part of the cookie. They coldly assume that
18 * the MMIO IO mappings are not in the low address range.
19 *
20 * Architectures for which this is not true can't use this generic
21 * implementation and should do their own copy.
22 */
23
24#ifndef HAVE_ARCH_PIO_SIZE
25/*
26 * We encode the physical PIO addresses (0-0xffff) into the
27 * pointer by offsetting them with a constant (0x10000) and
28 * assuming that all the low addresses are always PIO. That means
29 * we can do some sanity checks on the low bits, and don't
30 * need to just take things for granted.
31 */
32#define PIO_OFFSET 0x10000UL
33#define PIO_MASK 0x0ffffUL
34#define PIO_RESERVED 0x40000UL
35#endif
36
37/*
38 * Ugly macros are a way of life.
39 */
40#define VERIFY_PIO(port) BUG_ON((port & ~PIO_MASK) != PIO_OFFSET)
41
42#define IO_COND(addr, is_pio, is_mmio) do { \
43 unsigned long port = (unsigned long __force)addr; \
44 if (port < PIO_RESERVED) { \
45 VERIFY_PIO(port); \
46 port &= PIO_MASK; \
47 is_pio; \
48 } else { \
49 is_mmio; \
50 } \
51} while (0)
52
53unsigned int fastcall ioread8(void __iomem *addr)
54{
55 IO_COND(addr, return inb(port), return readb(addr));
56}
57unsigned int fastcall ioread16(void __iomem *addr)
58{
59 IO_COND(addr, return inw(port), return readw(addr));
60}
61unsigned int fastcall ioread16be(void __iomem *addr)
62{
63 IO_COND(addr, return inw(port), return be16_to_cpu(__raw_readw(addr)));
64}
65unsigned int fastcall ioread32(void __iomem *addr)
66{
67 IO_COND(addr, return inl(port), return readl(addr));
68}
69unsigned int fastcall ioread32be(void __iomem *addr)
70{
71 IO_COND(addr, return inl(port), return be32_to_cpu(__raw_readl(addr)));
72}
73EXPORT_SYMBOL(ioread8);
74EXPORT_SYMBOL(ioread16);
75EXPORT_SYMBOL(ioread16be);
76EXPORT_SYMBOL(ioread32);
77EXPORT_SYMBOL(ioread32be);
78
79void fastcall iowrite8(u8 val, void __iomem *addr)
80{
81 IO_COND(addr, outb(val,port), writeb(val, addr));
82}
83void fastcall iowrite16(u16 val, void __iomem *addr)
84{
85 IO_COND(addr, outw(val,port), writew(val, addr));
86}
87void fastcall iowrite16be(u16 val, void __iomem *addr)
88{
89 IO_COND(addr, outw(val,port), __raw_writew(cpu_to_be16(val), addr));
90}
91void fastcall iowrite32(u32 val, void __iomem *addr)
92{
93 IO_COND(addr, outl(val,port), writel(val, addr));
94}
95void fastcall iowrite32be(u32 val, void __iomem *addr)
96{
97 IO_COND(addr, outl(val,port), __raw_writel(cpu_to_be32(val), addr));
98}
99EXPORT_SYMBOL(iowrite8);
100EXPORT_SYMBOL(iowrite16);
101EXPORT_SYMBOL(iowrite16be);
102EXPORT_SYMBOL(iowrite32);
103EXPORT_SYMBOL(iowrite32be);
104
105/*
106 * These are the "repeat MMIO read/write" functions.
107 * Note the "__raw" accesses, since we don't want to
108 * convert to CPU byte order. We write in "IO byte
109 * order" (we also don't have IO barriers).
110 */
111static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
112{
113 while (--count >= 0) {
114 u8 data = __raw_readb(addr);
115 *dst = data;
116 dst++;
117 }
118}
119static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
120{
121 while (--count >= 0) {
122 u16 data = __raw_readw(addr);
123 *dst = data;
124 dst++;
125 }
126}
127static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
128{
129 while (--count >= 0) {
130 u32 data = __raw_readl(addr);
131 *dst = data;
132 dst++;
133 }
134}
135
136static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
137{
138 while (--count >= 0) {
139 __raw_writeb(*src, addr);
140 src++;
141 }
142}
143static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
144{
145 while (--count >= 0) {
146 __raw_writew(*src, addr);
147 src++;
148 }
149}
150static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
151{
152 while (--count >= 0) {
153 __raw_writel(*src, addr);
154 src++;
155 }
156}
157
158void fastcall ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
159{
160 IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
161}
162void fastcall ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
163{
164 IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
165}
166void fastcall ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
167{
168 IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
169}
170EXPORT_SYMBOL(ioread8_rep);
171EXPORT_SYMBOL(ioread16_rep);
172EXPORT_SYMBOL(ioread32_rep);
173
174void fastcall iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
175{
176 IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
177}
178void fastcall iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
179{
180 IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
181}
182void fastcall iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
183{
184 IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
185}
186EXPORT_SYMBOL(iowrite8_rep);
187EXPORT_SYMBOL(iowrite16_rep);
188EXPORT_SYMBOL(iowrite32_rep);
189
190/* Create a virtual mapping cookie for an IO port range */
191void __iomem *ioport_map(unsigned long port, unsigned int nr)
192{
193 if (port > PIO_MASK)
194 return NULL;
195 return (void __iomem *) (unsigned long) (port + PIO_OFFSET);
196}
197
198void ioport_unmap(void __iomem *addr)
199{
200 /* Nothing to do */
201}
202EXPORT_SYMBOL(ioport_map);
203EXPORT_SYMBOL(ioport_unmap);
204
205/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
206void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
207{
208 unsigned long start = pci_resource_start(dev, bar);
209 unsigned long len = pci_resource_len(dev, bar);
210 unsigned long flags = pci_resource_flags(dev, bar);
211
212 if (!len || !start)
213 return NULL;
214 if (maxlen && len > maxlen)
215 len = maxlen;
216 if (flags & IORESOURCE_IO)
217 return ioport_map(start, len);
218 if (flags & IORESOURCE_MEM) {
219 if (flags & IORESOURCE_CACHEABLE)
220 return ioremap(start, len);
221 return ioremap_nocache(start, len);
222 }
223 /* What? */
224 return NULL;
225}
226
227void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
228{
229 IO_COND(addr, /* nothing */, iounmap(addr));
230}
231EXPORT_SYMBOL(pci_iomap);
232EXPORT_SYMBOL(pci_iounmap);