1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994-1996  Linus Torvalds & authors
7 *
8 * Copied from i386; many of the especially older MIPS or ISA-based platforms
9 * are basically identical.  Using this file probably implies i8259 PIC
10 * support in a system but the very least interrupt numbers 0 - 15 need to
11 * be put aside for legacy devices.
12 */
13#ifndef __ASM_MACH_GENERIC_IDE_H
14#define __ASM_MACH_GENERIC_IDE_H
15
16#ifdef __KERNEL__
17
18#include <linux/pci.h>
19#include <linux/stddef.h>
20#include <asm/processor.h>
21
22/* MIPS port and memory-mapped I/O string operations.  */
23static inline void __ide_flush_prologue(void)
24{
25#ifdef CONFIG_SMP
26	if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
27		preempt_disable();
28#endif
29}
30
31static inline void __ide_flush_epilogue(void)
32{
33#ifdef CONFIG_SMP
34	if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
35		preempt_enable();
36#endif
37}
38
39static inline void __ide_flush_dcache_range(unsigned long addr, unsigned long size)
40{
41	if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc) {
42		unsigned long end = addr + size;
43
44		while (addr < end) {
45			local_flush_data_cache_page((void *)addr);
46			addr += PAGE_SIZE;
47		}
48	}
49}
50
51/*
52 * insw() and gang might be called with interrupts disabled, so we can't
53 * send IPIs for flushing due to the potencial of deadlocks, see the comment
54 * above smp_call_function() in arch/mips/kernel/smp.c.	 We work around the
55 * problem by disabling preemption so we know we actually perform the flush
56 * on the processor that actually has the lines to be flushed which hopefully
57 * is even better for performance anyway.
58 */
59static inline void __ide_insw(unsigned long port, void *addr,
60	unsigned int count)
61{
62	__ide_flush_prologue();
63	insw(port, addr, count);
64	__ide_flush_dcache_range((unsigned long)addr, count * 2);
65	__ide_flush_epilogue();
66}
67
68static inline void __ide_insl(unsigned long port, void *addr, unsigned int count)
69{
70	__ide_flush_prologue();
71	insl(port, addr, count);
72	__ide_flush_dcache_range((unsigned long)addr, count * 4);
73	__ide_flush_epilogue();
74}
75
76static inline void __ide_outsw(unsigned long port, const void *addr,
77	unsigned long count)
78{
79	__ide_flush_prologue();
80	outsw(port, addr, count);
81	__ide_flush_dcache_range((unsigned long)addr, count * 2);
82	__ide_flush_epilogue();
83}
84
85static inline void __ide_outsl(unsigned long port, const void *addr,
86	unsigned long count)
87{
88	__ide_flush_prologue();
89	outsl(port, addr, count);
90	__ide_flush_dcache_range((unsigned long)addr, count * 4);
91	__ide_flush_epilogue();
92}
93
94static inline void __ide_mm_insw(void __iomem *port, void *addr, u32 count)
95{
96	__ide_flush_prologue();
97	readsw(port, addr, count);
98	__ide_flush_dcache_range((unsigned long)addr, count * 2);
99	__ide_flush_epilogue();
100}
101
102static inline void __ide_mm_insl(void __iomem *port, void *addr, u32 count)
103{
104	__ide_flush_prologue();
105	readsl(port, addr, count);
106	__ide_flush_dcache_range((unsigned long)addr, count * 4);
107	__ide_flush_epilogue();
108}
109
110static inline void __ide_mm_outsw(void __iomem *port, void *addr, u32 count)
111{
112	__ide_flush_prologue();
113	writesw(port, addr, count);
114	__ide_flush_dcache_range((unsigned long)addr, count * 2);
115	__ide_flush_epilogue();
116}
117
118static inline void __ide_mm_outsl(void __iomem * port, void *addr, u32 count)
119{
120	__ide_flush_prologue();
121	writesl(port, addr, count);
122	__ide_flush_dcache_range((unsigned long)addr, count * 4);
123	__ide_flush_epilogue();
124}
125
126/* ide_insw calls insw, not __ide_insw.	 Why? */
127#undef insw
128#undef insl
129#undef outsw
130#undef outsl
131#define insw(port, addr, count) __ide_insw(port, addr, count)
132#define insl(port, addr, count) __ide_insl(port, addr, count)
133#define outsw(port, addr, count) __ide_outsw(port, addr, count)
134#define outsl(port, addr, count) __ide_outsl(port, addr, count)
135
136#endif /* __KERNEL__ */
137
138#endif /* __ASM_MACH_GENERIC_IDE_H */
139