1/*
2 * Implement the default iomap interfaces
3 *
4 * (C) Copyright 2004 Linus Torvalds
5 */
6#include <linux/pci.h>
7#include <linux/io.h>
8
9#include <linux/module.h>
10
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
38static 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
48/*
49 * Ugly macros are a way of life.
50 */
51#define IO_COND(addr, is_pio, is_mmio) do {			\
52	unsigned long port = (unsigned long __force)addr;	\
53	if (port >= PIO_RESERVED) {				\
54		is_mmio;					\
55	} else if (port > PIO_OFFSET) {				\
56		port &= PIO_MASK;				\
57		is_pio;						\
58	} else							\
59		bad_io_access(port, #is_pio );			\
60} while (0)
61
62#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
72unsigned int fastcall ioread8(void __iomem *addr)
73{
74	IO_COND(addr, return inb(port), return readb(addr));
75	return 0xff;
76}
77unsigned int fastcall ioread16(void __iomem *addr)
78{
79	IO_COND(addr, return inw(port), return readw(addr));
80	return 0xffff;
81}
82unsigned int fastcall ioread16be(void __iomem *addr)
83{
84	IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));
85	return 0xffff;
86}
87unsigned int fastcall ioread32(void __iomem *addr)
88{
89	IO_COND(addr, return inl(port), return readl(addr));
90	return 0xffffffff;
91}
92unsigned int fastcall ioread32be(void __iomem *addr)
93{
94	IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr));
95	return 0xffffffff;
96}
97EXPORT_SYMBOL(ioread8);
98EXPORT_SYMBOL(ioread16);
99EXPORT_SYMBOL(ioread16be);
100EXPORT_SYMBOL(ioread32);
101EXPORT_SYMBOL(ioread32be);
102
103#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
113void 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}
121void fastcall iowrite16be(u16 val, void __iomem *addr)
122{
123	IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr));
124}
125void fastcall iowrite32(u32 val, void __iomem *addr)
126{
127	IO_COND(addr, outl(val,port), writel(val, addr));
128}
129void fastcall iowrite32be(u32 val, void __iomem *addr)
130{
131	IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr));
132}
133EXPORT_SYMBOL(iowrite8);
134EXPORT_SYMBOL(iowrite16);
135EXPORT_SYMBOL(iowrite16be);
136EXPORT_SYMBOL(iowrite32);
137EXPORT_SYMBOL(iowrite32be);
138
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 */
145#ifndef mmio_insb
146static 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}
170#endif
171
172#ifndef mmio_outsb
173static 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}
194#endif
195
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
243/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
244void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
245{
246	unsigned long start = pci_resource_start(dev, bar);
247	unsigned long len = pci_resource_len(dev, bar);
248	unsigned long flags = pci_resource_flags(dev, bar);
249
250	if (!len || !start)
251		return NULL;
252	if (maxlen && len > maxlen)
253		len = maxlen;
254	if (flags & IORESOURCE_IO)
255		return ioport_map(start, len);
256	if (flags & IORESOURCE_MEM) {
257		if (flags & IORESOURCE_CACHEABLE)
258			return ioremap(start, len);
259		return ioremap_nocache(start, len);
260	}
261	/* What? */
262	return NULL;
263}
264
265void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
266{
267	IO_COND(addr, /* nothing */, iounmap(addr));
268}
269EXPORT_SYMBOL(pci_iomap);
270EXPORT_SYMBOL(pci_iounmap);
271