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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
[~andy/linux] / arch / arm / plat-samsung / s5p-irq-gpioint.c
1 /*
2  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
3  * Author: Kyungmin Park <kyungmin.park@samsung.com>
4  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
5  * Author: Marek Szyprowski <m.szyprowski@samsung.com>
6  *
7  *  This program is free software; you can redistribute  it and/or modify it
8  *  under  the terms of  the GNU General  Public License as published by the
9  *  Free Software Foundation;  either version 2 of the  License, or (at your
10  *  option) any later version.
11  *
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <linux/irqchip/chained_irq.h>
18 #include <linux/io.h>
19 #include <linux/gpio.h>
20 #include <linux/slab.h>
21
22 #include <mach/map.h>
23 #include <plat/gpio-core.h>
24 #include <plat/gpio-cfg.h>
25
26 #define GPIO_BASE(chip)         ((void __iomem *)((unsigned long)((chip)->base) & 0xFFFFF000u))
27
28 #define CON_OFFSET              0x700
29 #define MASK_OFFSET             0x900
30 #define PEND_OFFSET             0xA00
31 #define REG_OFFSET(x)           ((x) << 2)
32
33 struct s5p_gpioint_bank {
34         struct list_head        list;
35         int                     start;
36         int                     nr_groups;
37         int                     irq;
38         struct samsung_gpio_chip        **chips;
39         void                    (*handler)(unsigned int, struct irq_desc *);
40 };
41
42 static LIST_HEAD(banks);
43
44 static int s5p_gpioint_set_type(struct irq_data *d, unsigned int type)
45 {
46         struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
47         struct irq_chip_type *ct = gc->chip_types;
48         unsigned int shift = (d->irq - gc->irq_base) << 2;
49
50         switch (type) {
51         case IRQ_TYPE_EDGE_RISING:
52                 type = S5P_IRQ_TYPE_EDGE_RISING;
53                 break;
54         case IRQ_TYPE_EDGE_FALLING:
55                 type = S5P_IRQ_TYPE_EDGE_FALLING;
56                 break;
57         case IRQ_TYPE_EDGE_BOTH:
58                 type = S5P_IRQ_TYPE_EDGE_BOTH;
59                 break;
60         case IRQ_TYPE_LEVEL_HIGH:
61                 type = S5P_IRQ_TYPE_LEVEL_HIGH;
62                 break;
63         case IRQ_TYPE_LEVEL_LOW:
64                 type = S5P_IRQ_TYPE_LEVEL_LOW;
65                 break;
66         case IRQ_TYPE_NONE:
67         default:
68                 printk(KERN_WARNING "No irq type\n");
69                 return -EINVAL;
70         }
71
72         gc->type_cache &= ~(0x7 << shift);
73         gc->type_cache |= type << shift;
74         writel(gc->type_cache, gc->reg_base + ct->regs.type);
75         return 0;
76 }
77
78 static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
79 {
80         struct s5p_gpioint_bank *bank = irq_get_handler_data(irq);
81         int group, pend_offset, mask_offset;
82         unsigned int pend, mask;
83
84         struct irq_chip *chip = irq_get_chip(irq);
85         chained_irq_enter(chip, desc);
86
87         for (group = 0; group < bank->nr_groups; group++) {
88                 struct samsung_gpio_chip *chip = bank->chips[group];
89                 if (!chip)
90                         continue;
91
92                 pend_offset = REG_OFFSET(group);
93                 pend = __raw_readl(GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
94                 if (!pend)
95                         continue;
96
97                 mask_offset = REG_OFFSET(group);
98                 mask = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
99                 pend &= ~mask;
100
101                 while (pend) {
102                         int offset = fls(pend) - 1;
103                         int real_irq = chip->irq_base + offset;
104                         generic_handle_irq(real_irq);
105                         pend &= ~BIT(offset);
106                 }
107         }
108         chained_irq_exit(chip, desc);
109 }
110
111 static __init int s5p_gpioint_add(struct samsung_gpio_chip *chip)
112 {
113         static int used_gpioint_groups = 0;
114         int group = chip->group;
115         struct s5p_gpioint_bank *b, *bank = NULL;
116         struct irq_chip_generic *gc;
117         struct irq_chip_type *ct;
118
119         if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
120                 return -ENOMEM;
121
122         list_for_each_entry(b, &banks, list) {
123                 if (group >= b->start && group < b->start + b->nr_groups) {
124                         bank = b;
125                         break;
126                 }
127         }
128         if (!bank)
129                 return -EINVAL;
130
131         if (!bank->handler) {
132                 bank->chips = kzalloc(sizeof(struct samsung_gpio_chip *) *
133                                       bank->nr_groups, GFP_KERNEL);
134                 if (!bank->chips)
135                         return -ENOMEM;
136
137                 irq_set_chained_handler(bank->irq, s5p_gpioint_handler);
138                 irq_set_handler_data(bank->irq, bank);
139                 bank->handler = s5p_gpioint_handler;
140                 printk(KERN_INFO "Registered chained gpio int handler for interrupt %d.\n",
141                        bank->irq);
142         }
143
144         /*
145          * chained GPIO irq has been successfully registered, allocate new gpio
146          * int group and assign irq nubmers
147          */
148         chip->irq_base = S5P_GPIOINT_BASE +
149                          used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE;
150         used_gpioint_groups++;
151
152         bank->chips[group - bank->start] = chip;
153
154         gc = irq_alloc_generic_chip("s5p_gpioint", 1, chip->irq_base,
155                                     GPIO_BASE(chip),
156                                     handle_level_irq);
157         if (!gc)
158                 return -ENOMEM;
159         ct = gc->chip_types;
160         ct->chip.irq_ack = irq_gc_ack_set_bit;
161         ct->chip.irq_mask = irq_gc_mask_set_bit;
162         ct->chip.irq_unmask = irq_gc_mask_clr_bit;
163         ct->chip.irq_set_type = s5p_gpioint_set_type,
164         ct->regs.ack = PEND_OFFSET + REG_OFFSET(group - bank->start);
165         ct->regs.mask = MASK_OFFSET + REG_OFFSET(group - bank->start);
166         ct->regs.type = CON_OFFSET + REG_OFFSET(group - bank->start);
167         irq_setup_generic_chip(gc, IRQ_MSK(chip->chip.ngpio),
168                                IRQ_GC_INIT_MASK_CACHE,
169                                IRQ_NOREQUEST | IRQ_NOPROBE, 0);
170         return 0;
171 }
172
173 int __init s5p_register_gpio_interrupt(int pin)
174 {
175         struct samsung_gpio_chip *my_chip = samsung_gpiolib_getchip(pin);
176         int offset, group;
177         int ret;
178
179         if (!my_chip)
180                 return -EINVAL;
181
182         offset = pin - my_chip->chip.base;
183         group = my_chip->group;
184
185         /* check if the group has been already registered */
186         if (my_chip->irq_base)
187                 goto success;
188
189         /* register gpio group */
190         ret = s5p_gpioint_add(my_chip);
191         if (ret == 0) {
192                 my_chip->chip.to_irq = samsung_gpiolib_to_irq;
193                 printk(KERN_INFO "Registered interrupt support for gpio group %d.\n",
194                        group);
195                 goto success;
196         }
197         return ret;
198 success:
199         my_chip->bitmap_gpio_int |= BIT(offset);
200
201         return my_chip->irq_base + offset;
202 }
203
204 int __init s5p_register_gpioint_bank(int chain_irq, int start, int nr_groups)
205 {
206         struct s5p_gpioint_bank *bank;
207
208         bank = kzalloc(sizeof(*bank), GFP_KERNEL);
209         if (!bank)
210                 return -ENOMEM;
211
212         bank->start = start;
213         bank->nr_groups = nr_groups;
214         bank->irq = chain_irq;
215
216         list_add_tail(&bank->list, &banks);
217         return 0;
218 }