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Paul Mundt2be6bb02010-10-05 22:10:30 +09001/*
2 * IRQ chip definitions for INTC IRQs.
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/cpumask.h>
12#include <linux/io.h>
13#include "internals.h"
14
Paul Mundt26599a92010-10-27 15:42:10 +090015void _intc_enable(struct irq_data *data, unsigned long handle)
Paul Mundt2be6bb02010-10-05 22:10:30 +090016{
Paul Mundt26599a92010-10-27 15:42:10 +090017 unsigned int irq = data->irq;
Paul Mundt2be6bb02010-10-05 22:10:30 +090018 struct intc_desc_int *d = get_intc_desc(irq);
19 unsigned long addr;
20 unsigned int cpu;
21
22 for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) {
23#ifdef CONFIG_SMP
Paul Mundt26599a92010-10-27 15:42:10 +090024 if (!cpumask_test_cpu(cpu, data->affinity))
Paul Mundt2be6bb02010-10-05 22:10:30 +090025 continue;
26#endif
27 addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu);
28 intc_enable_fns[_INTC_MODE(handle)](addr, handle, intc_reg_fns\
29 [_INTC_FN(handle)], irq);
30 }
31
32 intc_balancing_enable(irq);
33}
34
Paul Mundt26599a92010-10-27 15:42:10 +090035static void intc_enable(struct irq_data *data)
Paul Mundt2be6bb02010-10-05 22:10:30 +090036{
Paul Mundt26599a92010-10-27 15:42:10 +090037 _intc_enable(data, (unsigned long)irq_data_get_irq_chip_data(data));
Paul Mundt2be6bb02010-10-05 22:10:30 +090038}
39
Paul Mundt26599a92010-10-27 15:42:10 +090040static void intc_disable(struct irq_data *data)
Paul Mundt2be6bb02010-10-05 22:10:30 +090041{
Paul Mundt26599a92010-10-27 15:42:10 +090042 unsigned int irq = data->irq;
Paul Mundt2be6bb02010-10-05 22:10:30 +090043 struct intc_desc_int *d = get_intc_desc(irq);
Paul Mundt26599a92010-10-27 15:42:10 +090044 unsigned long handle = (unsigned long)irq_data_get_irq_chip_data(data);
Paul Mundt2be6bb02010-10-05 22:10:30 +090045 unsigned long addr;
46 unsigned int cpu;
47
48 intc_balancing_disable(irq);
49
50 for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) {
51#ifdef CONFIG_SMP
Paul Mundt26599a92010-10-27 15:42:10 +090052 if (!cpumask_test_cpu(cpu, data->affinity))
Paul Mundt2be6bb02010-10-05 22:10:30 +090053 continue;
54#endif
55 addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu);
56 intc_disable_fns[_INTC_MODE(handle)](addr, handle,intc_reg_fns\
57 [_INTC_FN(handle)], irq);
58 }
59}
60
Paul Mundt26599a92010-10-27 15:42:10 +090061static int intc_set_wake(struct irq_data *data, unsigned int on)
Paul Mundt2be6bb02010-10-05 22:10:30 +090062{
63 return 0; /* allow wakeup, but setup hardware in intc_suspend() */
64}
65
66#ifdef CONFIG_SMP
67/*
68 * This is held with the irq desc lock held, so we don't require any
69 * additional locking here at the intc desc level. The affinity mask is
70 * later tested in the enable/disable paths.
71 */
Paul Mundt26599a92010-10-27 15:42:10 +090072static int intc_set_affinity(struct irq_data *data,
73 const struct cpumask *cpumask,
74 bool force)
Paul Mundt2be6bb02010-10-05 22:10:30 +090075{
76 if (!cpumask_intersects(cpumask, cpu_online_mask))
77 return -1;
78
Paul Mundt26599a92010-10-27 15:42:10 +090079 cpumask_copy(data->affinity, cpumask);
Paul Mundt2be6bb02010-10-05 22:10:30 +090080
81 return 0;
82}
83#endif
84
Paul Mundt26599a92010-10-27 15:42:10 +090085static void intc_mask_ack(struct irq_data *data)
Paul Mundt2be6bb02010-10-05 22:10:30 +090086{
Paul Mundt26599a92010-10-27 15:42:10 +090087 unsigned int irq = data->irq;
Paul Mundt2be6bb02010-10-05 22:10:30 +090088 struct intc_desc_int *d = get_intc_desc(irq);
89 unsigned long handle = intc_get_ack_handle(irq);
90 unsigned long addr;
91
Paul Mundt26599a92010-10-27 15:42:10 +090092 intc_disable(data);
Paul Mundt2be6bb02010-10-05 22:10:30 +090093
94 /* read register and write zero only to the associated bit */
95 if (handle) {
96 unsigned int value;
97
98 addr = INTC_REG(d, _INTC_ADDR_D(handle), 0);
99 value = intc_set_field_from_handle(0, 1, handle);
100
101 switch (_INTC_FN(handle)) {
102 case REG_FN_MODIFY_BASE + 0: /* 8bit */
103 __raw_readb(addr);
104 __raw_writeb(0xff ^ value, addr);
105 break;
106 case REG_FN_MODIFY_BASE + 1: /* 16bit */
107 __raw_readw(addr);
108 __raw_writew(0xffff ^ value, addr);
109 break;
110 case REG_FN_MODIFY_BASE + 3: /* 32bit */
111 __raw_readl(addr);
112 __raw_writel(0xffffffff ^ value, addr);
113 break;
114 default:
115 BUG();
116 break;
117 }
118 }
119}
120
121static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp,
122 unsigned int nr_hp,
123 unsigned int irq)
124{
125 int i;
126
127 /*
128 * this doesn't scale well, but...
129 *
130 * this function should only be used for cerain uncommon
131 * operations such as intc_set_priority() and intc_set_type()
132 * and in those rare cases performance doesn't matter that much.
133 * keeping the memory footprint low is more important.
134 *
135 * one rather simple way to speed this up and still keep the
136 * memory footprint down is to make sure the array is sorted
137 * and then perform a bisect to lookup the irq.
138 */
139 for (i = 0; i < nr_hp; i++) {
140 if ((hp + i)->irq != irq)
141 continue;
142
143 return hp + i;
144 }
145
146 return NULL;
147}
148
149int intc_set_priority(unsigned int irq, unsigned int prio)
150{
151 struct intc_desc_int *d = get_intc_desc(irq);
Paul Mundt26599a92010-10-27 15:42:10 +0900152 struct irq_data *data = irq_get_irq_data(irq);
Paul Mundt2be6bb02010-10-05 22:10:30 +0900153 struct intc_handle_int *ihp;
154
155 if (!intc_get_prio_level(irq) || prio <= 1)
156 return -EINVAL;
157
158 ihp = intc_find_irq(d->prio, d->nr_prio, irq);
159 if (ihp) {
160 if (prio >= (1 << _INTC_WIDTH(ihp->handle)))
161 return -EINVAL;
162
163 intc_set_prio_level(irq, prio);
164
165 /*
166 * only set secondary masking method directly
167 * primary masking method is using intc_prio_level[irq]
168 * priority level will be set during next enable()
169 */
170 if (_INTC_FN(ihp->handle) != REG_FN_ERR)
Paul Mundt26599a92010-10-27 15:42:10 +0900171 _intc_enable(data, ihp->handle);
Paul Mundt2be6bb02010-10-05 22:10:30 +0900172 }
173 return 0;
174}
175
Magnus Damm8a5a7782011-01-19 08:16:29 +0000176#define SENSE_VALID_FLAG 0x80
177#define VALID(x) (x | SENSE_VALID_FLAG)
Paul Mundt2be6bb02010-10-05 22:10:30 +0900178
179static unsigned char intc_irq_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
180 [IRQ_TYPE_EDGE_FALLING] = VALID(0),
181 [IRQ_TYPE_EDGE_RISING] = VALID(1),
182 [IRQ_TYPE_LEVEL_LOW] = VALID(2),
183 /* SH7706, SH7707 and SH7709 do not support high level triggered */
184#if !defined(CONFIG_CPU_SUBTYPE_SH7706) && \
185 !defined(CONFIG_CPU_SUBTYPE_SH7707) && \
186 !defined(CONFIG_CPU_SUBTYPE_SH7709)
187 [IRQ_TYPE_LEVEL_HIGH] = VALID(3),
188#endif
189};
190
Paul Mundt26599a92010-10-27 15:42:10 +0900191static int intc_set_type(struct irq_data *data, unsigned int type)
Paul Mundt2be6bb02010-10-05 22:10:30 +0900192{
Paul Mundt26599a92010-10-27 15:42:10 +0900193 unsigned int irq = data->irq;
Paul Mundt2be6bb02010-10-05 22:10:30 +0900194 struct intc_desc_int *d = get_intc_desc(irq);
195 unsigned char value = intc_irq_sense_table[type & IRQ_TYPE_SENSE_MASK];
196 struct intc_handle_int *ihp;
197 unsigned long addr;
198
199 if (!value)
200 return -EINVAL;
201
202 ihp = intc_find_irq(d->sense, d->nr_sense, irq);
203 if (ihp) {
204 addr = INTC_REG(d, _INTC_ADDR_E(ihp->handle), 0);
Magnus Damm8a5a7782011-01-19 08:16:29 +0000205 intc_reg_fns[_INTC_FN(ihp->handle)](addr, ihp->handle,
206 value & ~SENSE_VALID_FLAG);
Paul Mundt2be6bb02010-10-05 22:10:30 +0900207 }
208
209 return 0;
210}
211
212struct irq_chip intc_irq_chip = {
Paul Mundt26599a92010-10-27 15:42:10 +0900213 .irq_mask = intc_disable,
214 .irq_unmask = intc_enable,
215 .irq_mask_ack = intc_mask_ack,
216 .irq_enable = intc_enable,
217 .irq_disable = intc_disable,
218 .irq_shutdown = intc_disable,
219 .irq_set_type = intc_set_type,
220 .irq_set_wake = intc_set_wake,
Paul Mundt2be6bb02010-10-05 22:10:30 +0900221#ifdef CONFIG_SMP
Paul Mundt26599a92010-10-27 15:42:10 +0900222 .irq_set_affinity = intc_set_affinity,
Paul Mundt2be6bb02010-10-05 22:10:30 +0900223#endif
224};