xref: /openbmc/linux/drivers/sh/intc/access.c (revision f5c27da4)
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 
14 unsigned 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 
39 unsigned 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 
54 unsigned 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 
66 unsigned 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 
75 static unsigned long test_8(unsigned long addr, unsigned long h,
76 			    unsigned long ignore)
77 {
78 	void __iomem *ptr = (void __iomem *)addr;
79 	return intc_get_field_from_handle(__raw_readb(ptr), h);
80 }
81 
82 static unsigned long test_16(unsigned long addr, unsigned long h,
83 			     unsigned long ignore)
84 {
85 	void __iomem *ptr = (void __iomem *)addr;
86 	return intc_get_field_from_handle(__raw_readw(ptr), h);
87 }
88 
89 static unsigned long test_32(unsigned long addr, unsigned long h,
90 			     unsigned long ignore)
91 {
92 	void __iomem *ptr = (void __iomem *)addr;
93 	return intc_get_field_from_handle(__raw_readl(ptr), h);
94 }
95 
96 static unsigned long write_8(unsigned long addr, unsigned long h,
97 			     unsigned long data)
98 {
99 	void __iomem *ptr = (void __iomem *)addr;
100 	__raw_writeb(intc_set_field_from_handle(0, data, h), ptr);
101 	(void)__raw_readb(ptr);	/* Defeat write posting */
102 	return 0;
103 }
104 
105 static unsigned long write_16(unsigned long addr, unsigned long h,
106 			      unsigned long data)
107 {
108 	void __iomem *ptr = (void __iomem *)addr;
109 	__raw_writew(intc_set_field_from_handle(0, data, h), ptr);
110 	(void)__raw_readw(ptr);	/* Defeat write posting */
111 	return 0;
112 }
113 
114 static unsigned long write_32(unsigned long addr, unsigned long h,
115 			      unsigned long data)
116 {
117 	void __iomem *ptr = (void __iomem *)addr;
118 	__raw_writel(intc_set_field_from_handle(0, data, h), ptr);
119 	(void)__raw_readl(ptr);	/* Defeat write posting */
120 	return 0;
121 }
122 
123 static unsigned long modify_8(unsigned long addr, unsigned long h,
124 			      unsigned long data)
125 {
126 	void __iomem *ptr = (void __iomem *)addr;
127 	unsigned long flags;
128 	unsigned int value;
129 	local_irq_save(flags);
130 	value = intc_set_field_from_handle(__raw_readb(ptr), data, h);
131 	__raw_writeb(value, ptr);
132 	(void)__raw_readb(ptr);	/* Defeat write posting */
133 	local_irq_restore(flags);
134 	return 0;
135 }
136 
137 static unsigned long modify_16(unsigned long addr, unsigned long h,
138 			       unsigned long data)
139 {
140 	void __iomem *ptr = (void __iomem *)addr;
141 	unsigned long flags;
142 	unsigned int value;
143 	local_irq_save(flags);
144 	value = intc_set_field_from_handle(__raw_readw(ptr), data, h);
145 	__raw_writew(value, ptr);
146 	(void)__raw_readw(ptr);	/* Defeat write posting */
147 	local_irq_restore(flags);
148 	return 0;
149 }
150 
151 static unsigned long modify_32(unsigned long addr, unsigned long h,
152 			       unsigned long data)
153 {
154 	void __iomem *ptr = (void __iomem *)addr;
155 	unsigned long flags;
156 	unsigned int value;
157 	local_irq_save(flags);
158 	value = intc_set_field_from_handle(__raw_readl(ptr), data, h);
159 	__raw_writel(value, ptr);
160 	(void)__raw_readl(ptr);	/* Defeat write posting */
161 	local_irq_restore(flags);
162 	return 0;
163 }
164 
165 static unsigned long intc_mode_field(unsigned long addr,
166 				     unsigned long handle,
167 				     unsigned long (*fn)(unsigned long,
168 						unsigned long,
169 						unsigned long),
170 				     unsigned int irq)
171 {
172 	return fn(addr, handle, ((1 << _INTC_WIDTH(handle)) - 1));
173 }
174 
175 static unsigned long intc_mode_zero(unsigned long addr,
176 				    unsigned long handle,
177 				    unsigned long (*fn)(unsigned long,
178 					       unsigned long,
179 					       unsigned long),
180 				    unsigned int irq)
181 {
182 	return fn(addr, handle, 0);
183 }
184 
185 static unsigned long intc_mode_prio(unsigned long addr,
186 				    unsigned long handle,
187 				    unsigned long (*fn)(unsigned long,
188 					       unsigned long,
189 					       unsigned long),
190 				    unsigned int irq)
191 {
192 	return fn(addr, handle, intc_get_prio_level(irq));
193 }
194 
195 unsigned long (*intc_reg_fns[])(unsigned long addr,
196 				unsigned long h,
197 				unsigned long data) = {
198 	[REG_FN_TEST_BASE + 0] = test_8,
199 	[REG_FN_TEST_BASE + 1] = test_16,
200 	[REG_FN_TEST_BASE + 3] = test_32,
201 	[REG_FN_WRITE_BASE + 0] = write_8,
202 	[REG_FN_WRITE_BASE + 1] = write_16,
203 	[REG_FN_WRITE_BASE + 3] = write_32,
204 	[REG_FN_MODIFY_BASE + 0] = modify_8,
205 	[REG_FN_MODIFY_BASE + 1] = modify_16,
206 	[REG_FN_MODIFY_BASE + 3] = modify_32,
207 };
208 
209 unsigned long (*intc_enable_fns[])(unsigned long addr,
210 				   unsigned long handle,
211 				   unsigned long (*fn)(unsigned long,
212 					    unsigned long,
213 					    unsigned long),
214 				   unsigned int irq) = {
215 	[MODE_ENABLE_REG] = intc_mode_field,
216 	[MODE_MASK_REG] = intc_mode_zero,
217 	[MODE_DUAL_REG] = intc_mode_field,
218 	[MODE_PRIO_REG] = intc_mode_prio,
219 	[MODE_PCLR_REG] = intc_mode_prio,
220 };
221 
222 unsigned long (*intc_disable_fns[])(unsigned long addr,
223 				    unsigned long handle,
224 				    unsigned long (*fn)(unsigned long,
225 					     unsigned long,
226 					     unsigned long),
227 				    unsigned int irq) = {
228 	[MODE_ENABLE_REG] = intc_mode_zero,
229 	[MODE_MASK_REG] = intc_mode_field,
230 	[MODE_DUAL_REG] = intc_mode_field,
231 	[MODE_PRIO_REG] = intc_mode_zero,
232 	[MODE_PCLR_REG] = intc_mode_field,
233 };
234 
235 unsigned long (*intc_enable_noprio_fns[])(unsigned long addr,
236 					  unsigned long handle,
237 					  unsigned long (*fn)(unsigned long,
238 						unsigned long,
239 						unsigned long),
240 					  unsigned int irq) = {
241 	[MODE_ENABLE_REG] = intc_mode_field,
242 	[MODE_MASK_REG] = intc_mode_zero,
243 	[MODE_DUAL_REG] = intc_mode_field,
244 	[MODE_PRIO_REG] = intc_mode_field,
245 	[MODE_PCLR_REG] = intc_mode_field,
246 };
247