aboutsummaryrefslogtreecommitdiff
path: root/arch/sh/include/asm/io.h
blob: 73a23f4617a37c5a5270d5bc50d9689af45d8f89 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
#ifndef __ASM_SH_IO_H
#define __ASM_SH_IO_H

/*
 * Convention:
 *    read{b,w,l,q}/write{b,w,l,q} are for PCI,
 *    while in{b,w,l}/out{b,w,l} are for ISA
 *
 * In addition we have 'pausing' versions: in{b,w,l}_p/out{b,w,l}_p
 * and 'string' versions: ins{b,w,l}/outs{b,w,l}
 *
 * While read{b,w,l,q} and write{b,w,l,q} contain memory barriers
 * automatically, there are also __raw versions, which do not.
 */
#include <linux/errno.h>
#include <asm/cache.h>
#include <asm/addrspace.h>
#include <asm/machvec.h>
#include <asm/pgtable.h>
#include <asm-generic/iomap.h>

#ifdef __KERNEL__
#define __IO_PREFIX     generic
#include <asm/io_generic.h>
#include <asm/io_trapped.h>
#include <mach/mangle-port.h>

#define __raw_writeb(v,a)	(__chk_io_ptr(a), *(volatile u8  __force *)(a) = (v))
#define __raw_writew(v,a)	(__chk_io_ptr(a), *(volatile u16 __force *)(a) = (v))
#define __raw_writel(v,a)	(__chk_io_ptr(a), *(volatile u32 __force *)(a) = (v))
#define __raw_writeq(v,a)	(__chk_io_ptr(a), *(volatile u64 __force *)(a) = (v))

#define __raw_readb(a)		(__chk_io_ptr(a), *(volatile u8  __force *)(a))
#define __raw_readw(a)		(__chk_io_ptr(a), *(volatile u16 __force *)(a))
#define __raw_readl(a)		(__chk_io_ptr(a), *(volatile u32 __force *)(a))
#define __raw_readq(a)		(__chk_io_ptr(a), *(volatile u64 __force *)(a))

#define readb_relaxed(c)	({ u8  __v = ioswabb(__raw_readb(c)); __v; })
#define readw_relaxed(c)	({ u16 __v = ioswabw(__raw_readw(c)); __v; })
#define readl_relaxed(c)	({ u32 __v = ioswabl(__raw_readl(c)); __v; })
#define readq_relaxed(c)	({ u64 __v = ioswabq(__raw_readq(c)); __v; })

#define writeb_relaxed(v,c)	((void)__raw_writeb((__force  u8)ioswabb(v),c))
#define writew_relaxed(v,c)	((void)__raw_writew((__force u16)ioswabw(v),c))
#define writel_relaxed(v,c)	((void)__raw_writel((__force u32)ioswabl(v),c))
#define writeq_relaxed(v,c)	((void)__raw_writeq((__force u64)ioswabq(v),c))

#define readb(a)		({ u8  r_ = readb_relaxed(a); rmb(); r_; })
#define readw(a)		({ u16 r_ = readw_relaxed(a); rmb(); r_; })
#define readl(a)		({ u32 r_ = readl_relaxed(a); rmb(); r_; })
#define readq(a)		({ u64 r_ = readq_relaxed(a); rmb(); r_; })

#define writeb(v,a)		({ wmb(); writeb_relaxed((v),(a)); })
#define writew(v,a)		({ wmb(); writew_relaxed((v),(a)); })
#define writel(v,a)		({ wmb(); writel_relaxed((v),(a)); })
#define writeq(v,a)		({ wmb(); writeq_relaxed((v),(a)); })

#define readsb(p,d,l)		__raw_readsb(p,d,l)
#define readsw(p,d,l)		__raw_readsw(p,d,l)
#define readsl(p,d,l)		__raw_readsl(p,d,l)

#define writesb(p,d,l)		__raw_writesb(p,d,l)
#define writesw(p,d,l)		__raw_writesw(p,d,l)
#define writesl(p,d,l)		__raw_writesl(p,d,l)

#define __BUILD_UNCACHED_IO(bwlq, type)					\
static inline type read##bwlq##_uncached(unsigned long addr)		\
{									\
	type ret;							\
	jump_to_uncached();						\
	ret = __raw_read##bwlq(addr);					\
	back_to_cached();						\
	return ret;							\
}									\
									\
static inline void write##bwlq##_uncached(type v, unsigned long addr)	\
{									\
	jump_to_uncached();						\
	__raw_write##bwlq(v, addr);					\
	back_to_cached();						\
}

__BUILD_UNCACHED_IO(b, u8)
__BUILD_UNCACHED_IO(w, u16)
__BUILD_UNCACHED_IO(l, u32)
__BUILD_UNCACHED_IO(q, u64)

#define __BUILD_MEMORY_STRING(pfx, bwlq, type)				\
									\
static inline void							\
pfx##writes##bwlq(volatile void __iomem *mem, const void *addr,		\
		  unsigned int count)					\
{									\
	const volatile type *__addr = addr;				\
									\
	while (count--) {						\
		__raw_write##bwlq(*__addr, mem);			\
		__addr++;						\
	}								\
}									\
									\
static inline void pfx##reads##bwlq(volatile void __iomem *mem,		\
				    void *addr, unsigned int count)	\
{									\
	volatile type *__addr = addr;					\
									\
	while (count--) {						\
		*__addr = __raw_read##bwlq(mem);			\
		__addr++;						\
	}								\
}

__BUILD_MEMORY_STRING(__raw_, b, u8)
__BUILD_MEMORY_STRING(__raw_, w, u16)

#ifdef CONFIG_SUPERH32
void __raw_writesl(void __iomem *addr, const void *data, int longlen);
void __raw_readsl(const void __iomem *addr, void *data, int longlen);
#else
__BUILD_MEMORY_STRING(__raw_, l, u32)
#endif

__BUILD_MEMORY_STRING(__raw_, q, u64)

#ifdef CONFIG_HAS_IOPORT

/*
 * Slowdown I/O port space accesses for antique hardware.
 */
#undef CONF_SLOWDOWN_IO

/*
 * On SuperH I/O ports are memory mapped, so we access them using normal
 * load/store instructions. sh_io_port_base is the virtual address to
 * which all ports are being mapped.
 */
extern unsigned long sh_io_port_base;

static inline void __set_io_port_base(unsigned long pbase)
{
	*(unsigned long *)&sh_io_port_base = pbase;
	barrier();
}

#ifdef CONFIG_GENERIC_IOMAP
#define __ioport_map ioport_map
#else
extern void __iomem *__ioport_map(unsigned long addr, unsigned int size);
#endif

#ifdef CONF_SLOWDOWN_IO
#define SLOW_DOWN_IO __raw_readw(sh_io_port_base)
#else
#define SLOW_DOWN_IO
#endif

#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow)			\
									\
static inline void pfx##out##bwlq##p(type val, unsigned long port)	\
{									\
	volatile type *__addr;						\
									\
	__addr = __ioport_map(port, sizeof(type));			\
	*__addr = val;							\
	slow;								\
}									\
									\
static inline type pfx##in##bwlq##p(unsigned long port)			\
{									\
	volatile type *__addr;						\
	type __val;							\
									\
	__addr = __ioport_map(port, sizeof(type));			\
	__val = *__addr;						\
	slow;								\
									\
	return __val;							\
}

#define __BUILD_IOPORT_PFX(bus, bwlq, type)				\
	__BUILD_IOPORT_SINGLE(bus, bwlq, type, ,)			\
	__BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO)

#define BUILDIO_IOPORT(bwlq, type)					\
	__BUILD_IOPORT_PFX(, bwlq, type)

BUILDIO_IOPORT(b, u8)
BUILDIO_IOPORT(w, u16)
BUILDIO_IOPORT(l, u32)
BUILDIO_IOPORT(q, u64)

#define __BUILD_IOPORT_STRING(bwlq, type)				\
									\
static inline void outs##bwlq(unsigned long port, const void *addr,	\
			      unsigned int count)			\
{									\
	const volatile type *__addr = addr;				\
									\
	while (count--) {						\
		out##bwlq(*__addr, port);				\
		__addr++;						\
	}								\
}									\
									\
static inline void ins##bwlq(unsigned long port, void *addr,		\
			     unsigned int count)			\
{									\
	volatile type *__addr = addr;					\
									\
	while (count--) {						\
		*__addr = in##bwlq(port);				\
		__addr++;						\
	}								\
}

__BUILD_IOPORT_STRING(b, u8)
__BUILD_IOPORT_STRING(w, u16)
__BUILD_IOPORT_STRING(l, u32)
__BUILD_IOPORT_STRING(q, u64)

#else /* !CONFIG_HAS_IOPORT */

#include <asm/io_noioport.h>

#endif


#define IO_SPACE_LIMIT 0xffffffff

/* synco on SH-4A, otherwise a nop */
#define mmiowb()		wmb()

/* We really want to try and get these to memcpy etc */
void memcpy_fromio(void *, const volatile void __iomem *, unsigned long);
void memcpy_toio(volatile void __iomem *, const void *, unsigned long);
void memset_io(volatile void __iomem *, int, unsigned long);

/* Quad-word real-mode I/O, don't ask.. */
unsigned long long peek_real_address_q(unsigned long long addr);
unsigned long long poke_real_address_q(unsigned long long addr,
				       unsigned long long val);

#if !defined(CONFIG_MMU)
#define virt_to_phys(address)	((unsigned long)(address))
#define phys_to_virt(address)	((void *)(address))
#else
#define virt_to_phys(address)	(__pa(address))
#define phys_to_virt(address)	(__va(address))
#endif

/*
 * On 32-bit SH, we traditionally have the whole physical address space
 * mapped at all times (as MIPS does), so "ioremap()" and "iounmap()" do
 * not need to do anything but place the address in the proper segment.
 * This is true for P1 and P2 addresses, as well as some P3 ones.
 * However, most of the P3 addresses and newer cores using extended
 * addressing need to map through page tables, so the ioremap()
 * implementation becomes a bit more complicated.
 *
 * See arch/sh/mm/ioremap.c for additional notes on this.
 *
 * We cheat a bit and always return uncachable areas until we've fixed
 * the drivers to handle caching properly.
 *
 * On the SH-5 the concept of segmentation in the 1:1 PXSEG sense simply
 * doesn't exist, so everything must go through page tables.
 */
#ifdef CONFIG_MMU
void __iomem *__ioremap_caller(phys_addr_t offset, unsigned long size,
			       pgprot_t prot, void *caller);
void __iounmap(void __iomem *addr);

static inline void __iomem *
__ioremap(phys_addr_t offset, unsigned long size, pgprot_t prot)
{
	return __ioremap_caller(offset, size, prot, __builtin_return_address(0));
}

static inline void __iomem *
__ioremap_29bit(phys_addr_t offset, unsigned long size, pgprot_t prot)
{
#ifdef CONFIG_29BIT
	phys_addr_t last_addr = offset + size - 1;

	/*
	 * For P1 and P2 space this is trivial, as everything is already
	 * mapped. Uncached access for P1 addresses are done through P2.
	 * In the P3 case or for addresses outside of the 29-bit space,
	 * mapping must be done by the PMB or by using page tables.
	 */
	if (likely(PXSEG(offset) < P3SEG && PXSEG(last_addr) < P3SEG)) {
		u64 flags = pgprot_val(prot);

		/*
		 * Anything using the legacy PTEA space attributes needs
		 * to be kicked down to page table mappings.
		 */
		if (unlikely(flags & _PAGE_PCC_MASK))
			return NULL;
		if (unlikely(flags & _PAGE_CACHABLE))
			return (void __iomem *)P1SEGADDR(offset);

		return (void __iomem *)P2SEGADDR(offset);
	}

	/* P4 above the store queues are always mapped. */
	if (unlikely(offset >= P3_ADDR_MAX))
		return (void __iomem *)P4SEGADDR(offset);
#endif

	return NULL;
}

static inline void __iomem *
__ioremap_mode(phys_addr_t offset, unsigned long size, pgprot_t prot)
{
	void __iomem *ret;

	ret = __ioremap_trapped(offset, size);
	if (ret)
		return ret;

	ret = __ioremap_29bit(offset, size, prot);
	if (ret)
		return ret;

	return __ioremap(offset, size, prot);
}
#else
#define __ioremap(offset, size, prot)		((void __iomem *)(offset))
#define __ioremap_mode(offset, size, prot)	((void __iomem *)(offset))
#define __iounmap(addr)				do { } while (0)
#endif /* CONFIG_MMU */

static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
{
	return __ioremap_mode(offset, size, PAGE_KERNEL_NOCACHE);
}

static inline void __iomem *
ioremap_cache(phys_addr_t offset, unsigned long size)
{
	return __ioremap_mode(offset, size, PAGE_KERNEL);
}

#ifdef CONFIG_HAVE_IOREMAP_PROT
static inline void __iomem *
ioremap_prot(phys_addr_t offset, unsigned long size, unsigned long flags)
{
	return __ioremap_mode(offset, size, __pgprot(flags));
}
#endif

#ifdef CONFIG_IOREMAP_FIXED
extern void __iomem *ioremap_fixed(phys_addr_t, unsigned long, pgprot_t);
extern int iounmap_fixed(void __iomem *);
extern void ioremap_fixed_init(void);
#else
static inline void __iomem *
ioremap_fixed(phys_addr_t phys_addr, unsigned long size, pgprot_t prot)
{
	BUG();
	return NULL;
}

static inline void ioremap_fixed_init(void) { }
static inline int iounmap_fixed(void __iomem *addr) { return -EINVAL; }
#endif

#define ioremap_nocache	ioremap
#define iounmap		__iounmap

/*
 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 * access
 */
#define xlate_dev_mem_ptr(p)	__va(p)

/*
 * Convert a virtual cached pointer to an uncached pointer
 */
#define xlate_dev_kmem_ptr(p)	p

#define ARCH_HAS_VALID_PHYS_ADDR_RANGE
int valid_phys_addr_range(unsigned long addr, size_t size);
int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);

#endif /* __KERNEL__ */

#endif /* __ASM_SH_IO_H */