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-rw-r--r--drivers/sh/intc/access.c237
1 files changed, 237 insertions, 0 deletions
diff --git a/drivers/sh/intc/access.c b/drivers/sh/intc/access.c
new file mode 100644
index 000000000000..f892ae1d212a
--- /dev/null
+++ b/drivers/sh/intc/access.c
@@ -0,0 +1,237 @@
1/*
2 * Common INTC2 register accessors
3 *
4 * Copyright (C) 2007, 2008 Magnus Damm
5 * Copyright (C) 2009, 2010 Paul Mundt
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
9 * for more details.
10 */
11#include <linux/io.h>
12#include "internals.h"
13
14unsigned long intc_phys_to_virt(struct intc_desc_int *d, unsigned long address)
15{
16 struct intc_window *window;
17 int k;
18
19 /* scan through physical windows and convert address */
20 for (k = 0; k < d->nr_windows; k++) {
21 window = d->window + k;
22
23 if (address < window->phys)
24 continue;
25
26 if (address >= (window->phys + window->size))
27 continue;
28
29 address -= window->phys;
30 address += (unsigned long)window->virt;
31
32 return address;
33 }
34
35 /* no windows defined, register must be 1:1 mapped virt:phys */
36 return address;
37}
38
39unsigned int intc_get_reg(struct intc_desc_int *d, unsigned long address)
40{
41 unsigned int k;
42
43 address = intc_phys_to_virt(d, address);
44
45 for (k = 0; k < d->nr_reg; k++) {
46 if (d->reg[k] == address)
47 return k;
48 }
49
50 BUG();
51 return 0;
52}
53
54unsigned int intc_set_field_from_handle(unsigned int value,
55 unsigned int field_value,
56 unsigned int handle)
57{
58 unsigned int width = _INTC_WIDTH(handle);
59 unsigned int shift = _INTC_SHIFT(handle);
60
61 value &= ~(((1 << width) - 1) << shift);
62 value |= field_value << shift;
63 return value;
64}
65
66unsigned long intc_get_field_from_handle(unsigned int value, unsigned int handle)
67{
68 unsigned int width = _INTC_WIDTH(handle);
69 unsigned int shift = _INTC_SHIFT(handle);
70 unsigned int mask = ((1 << width) - 1) << shift;
71
72 return (value & mask) >> shift;
73}
74
75static unsigned long test_8(unsigned long addr, unsigned long h,
76 unsigned long ignore)
77{
78 return intc_get_field_from_handle(__raw_readb(addr), h);
79}
80
81static unsigned long test_16(unsigned long addr, unsigned long h,
82 unsigned long ignore)
83{
84 return intc_get_field_from_handle(__raw_readw(addr), h);
85}
86
87static unsigned long test_32(unsigned long addr, unsigned long h,
88 unsigned long ignore)
89{
90 return intc_get_field_from_handle(__raw_readl(addr), h);
91}
92
93static unsigned long write_8(unsigned long addr, unsigned long h,
94 unsigned long data)
95{
96 __raw_writeb(intc_set_field_from_handle(0, data, h), addr);
97 (void)__raw_readb(addr); /* Defeat write posting */
98 return 0;
99}
100
101static unsigned long write_16(unsigned long addr, unsigned long h,
102 unsigned long data)
103{
104 __raw_writew(intc_set_field_from_handle(0, data, h), addr);
105 (void)__raw_readw(addr); /* Defeat write posting */
106 return 0;
107}
108
109static unsigned long write_32(unsigned long addr, unsigned long h,
110 unsigned long data)
111{
112 __raw_writel(intc_set_field_from_handle(0, data, h), addr);
113 (void)__raw_readl(addr); /* Defeat write posting */
114 return 0;
115}
116
117static unsigned long modify_8(unsigned long addr, unsigned long h,
118 unsigned long data)
119{
120 unsigned long flags;
121 unsigned int value;
122 local_irq_save(flags);
123 value = intc_set_field_from_handle(__raw_readb(addr), data, h);
124 __raw_writeb(value, addr);
125 (void)__raw_readb(addr); /* Defeat write posting */
126 local_irq_restore(flags);
127 return 0;
128}
129
130static unsigned long modify_16(unsigned long addr, unsigned long h,
131 unsigned long data)
132{
133 unsigned long flags;
134 unsigned int value;
135 local_irq_save(flags);
136 value = intc_set_field_from_handle(__raw_readw(addr), data, h);
137 __raw_writew(value, addr);
138 (void)__raw_readw(addr); /* Defeat write posting */
139 local_irq_restore(flags);
140 return 0;
141}
142
143static unsigned long modify_32(unsigned long addr, unsigned long h,
144 unsigned long data)
145{
146 unsigned long flags;
147 unsigned int value;
148 local_irq_save(flags);
149 value = intc_set_field_from_handle(__raw_readl(addr), data, h);
150 __raw_writel(value, addr);
151 (void)__raw_readl(addr); /* Defeat write posting */
152 local_irq_restore(flags);
153 return 0;
154}
155
156static unsigned long intc_mode_field(unsigned long addr,
157 unsigned long handle,
158 unsigned long (*fn)(unsigned long,
159 unsigned long,
160 unsigned long),
161 unsigned int irq)
162{
163 return fn(addr, handle, ((1 << _INTC_WIDTH(handle)) - 1));
164}
165
166static unsigned long intc_mode_zero(unsigned long addr,
167 unsigned long handle,
168 unsigned long (*fn)(unsigned long,
169 unsigned long,
170 unsigned long),
171 unsigned int irq)
172{
173 return fn(addr, handle, 0);
174}
175
176static unsigned long intc_mode_prio(unsigned long addr,
177 unsigned long handle,
178 unsigned long (*fn)(unsigned long,
179 unsigned long,
180 unsigned long),
181 unsigned int irq)
182{
183 return fn(addr, handle, intc_get_prio_level(irq));
184}
185
186unsigned long (*intc_reg_fns[])(unsigned long addr,
187 unsigned long h,
188 unsigned long data) = {
189 [REG_FN_TEST_BASE + 0] = test_8,
190 [REG_FN_TEST_BASE + 1] = test_16,
191 [REG_FN_TEST_BASE + 3] = test_32,
192 [REG_FN_WRITE_BASE + 0] = write_8,
193 [REG_FN_WRITE_BASE + 1] = write_16,
194 [REG_FN_WRITE_BASE + 3] = write_32,
195 [REG_FN_MODIFY_BASE + 0] = modify_8,
196 [REG_FN_MODIFY_BASE + 1] = modify_16,
197 [REG_FN_MODIFY_BASE + 3] = modify_32,
198};
199
200unsigned long (*intc_enable_fns[])(unsigned long addr,
201 unsigned long handle,
202 unsigned long (*fn)(unsigned long,
203 unsigned long,
204 unsigned long),
205 unsigned int irq) = {
206 [MODE_ENABLE_REG] = intc_mode_field,
207 [MODE_MASK_REG] = intc_mode_zero,
208 [MODE_DUAL_REG] = intc_mode_field,
209 [MODE_PRIO_REG] = intc_mode_prio,
210 [MODE_PCLR_REG] = intc_mode_prio,
211};
212
213unsigned long (*intc_disable_fns[])(unsigned long addr,
214 unsigned long handle,
215 unsigned long (*fn)(unsigned long,
216 unsigned long,
217 unsigned long),
218 unsigned int irq) = {
219 [MODE_ENABLE_REG] = intc_mode_zero,
220 [MODE_MASK_REG] = intc_mode_field,
221 [MODE_DUAL_REG] = intc_mode_field,
222 [MODE_PRIO_REG] = intc_mode_zero,
223 [MODE_PCLR_REG] = intc_mode_field,
224};
225
226unsigned long (*intc_enable_noprio_fns[])(unsigned long addr,
227 unsigned long handle,
228 unsigned long (*fn)(unsigned long,
229 unsigned long,
230 unsigned long),
231 unsigned int irq) = {
232 [MODE_ENABLE_REG] = intc_mode_field,
233 [MODE_MASK_REG] = intc_mode_zero,
234 [MODE_DUAL_REG] = intc_mode_field,
235 [MODE_PRIO_REG] = intc_mode_field,
236 [MODE_PCLR_REG] = intc_mode_field,
237};
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