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170a4617 MS |
1 | /* linux/arch/arm/plat-s5p/irq-gpioint.c |
2 | * | |
3 | * Copyright (c) 2010 Samsung Electronics Co., Ltd. | |
4 | * Author: Kyungmin Park <kyungmin.park@samsung.com> | |
5 | * Author: Joonyoung Shim <jy0922.shim@samsung.com> | |
6 | * Author: Marek Szyprowski <m.szyprowski@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/irq.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/gpio.h> | |
a43efddc | 20 | #include <linux/slab.h> |
170a4617 MS |
21 | |
22 | #include <mach/map.h> | |
23 | #include <plat/gpio-core.h> | |
24 | #include <plat/gpio-cfg.h> | |
25 | ||
3f6065dd MS |
26 | #include <asm/mach/irq.h> |
27 | ||
2de09262 | 28 | #define GPIO_BASE(chip) (((unsigned long)(chip)->base) & 0xFFFFF000u) |
170a4617 | 29 | |
2de09262 MS |
30 | #define CON_OFFSET 0x700 |
31 | #define MASK_OFFSET 0x900 | |
32 | #define PEND_OFFSET 0xA00 | |
33 | #define REG_OFFSET(x) ((x) << 2) | |
170a4617 | 34 | |
a43efddc MS |
35 | struct s5p_gpioint_bank { |
36 | struct list_head list; | |
37 | int start; | |
38 | int nr_groups; | |
39 | int irq; | |
782d8a3c | 40 | struct samsung_gpio_chip **chips; |
a43efddc MS |
41 | void (*handler)(unsigned int, struct irq_desc *); |
42 | }; | |
43 | ||
6d259a25 | 44 | static LIST_HEAD(banks); |
170a4617 | 45 | |
ad739dcf | 46 | static int s5p_gpioint_set_type(struct irq_data *d, unsigned int type) |
170a4617 | 47 | { |
ad739dcf TG |
48 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); |
49 | struct irq_chip_type *ct = gc->chip_types; | |
50 | unsigned int shift = (d->irq - gc->irq_base) << 2; | |
170a4617 MS |
51 | |
52 | switch (type) { | |
53 | case IRQ_TYPE_EDGE_RISING: | |
9adf5d22 | 54 | type = S5P_IRQ_TYPE_EDGE_RISING; |
170a4617 MS |
55 | break; |
56 | case IRQ_TYPE_EDGE_FALLING: | |
9adf5d22 | 57 | type = S5P_IRQ_TYPE_EDGE_FALLING; |
170a4617 MS |
58 | break; |
59 | case IRQ_TYPE_EDGE_BOTH: | |
9adf5d22 | 60 | type = S5P_IRQ_TYPE_EDGE_BOTH; |
170a4617 MS |
61 | break; |
62 | case IRQ_TYPE_LEVEL_HIGH: | |
9adf5d22 | 63 | type = S5P_IRQ_TYPE_LEVEL_HIGH; |
170a4617 MS |
64 | break; |
65 | case IRQ_TYPE_LEVEL_LOW: | |
9adf5d22 | 66 | type = S5P_IRQ_TYPE_LEVEL_LOW; |
170a4617 MS |
67 | break; |
68 | case IRQ_TYPE_NONE: | |
69 | default: | |
70 | printk(KERN_WARNING "No irq type\n"); | |
71 | return -EINVAL; | |
72 | } | |
73 | ||
ad739dcf TG |
74 | gc->type_cache &= ~(0x7 << shift); |
75 | gc->type_cache |= type << shift; | |
76 | writel(gc->type_cache, gc->reg_base + ct->regs.type); | |
170a4617 MS |
77 | return 0; |
78 | } | |
79 | ||
170a4617 MS |
80 | static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc) |
81 | { | |
6845664a | 82 | struct s5p_gpioint_bank *bank = irq_get_handler_data(irq); |
2de09262 | 83 | int group, pend_offset, mask_offset; |
170a4617 MS |
84 | unsigned int pend, mask; |
85 | ||
3f6065dd MS |
86 | struct irq_chip *chip = irq_get_chip(irq); |
87 | chained_irq_enter(chip, desc); | |
88 | ||
a43efddc | 89 | for (group = 0; group < bank->nr_groups; group++) { |
782d8a3c | 90 | struct samsung_gpio_chip *chip = bank->chips[group]; |
2de09262 MS |
91 | if (!chip) |
92 | continue; | |
93 | ||
94 | pend_offset = REG_OFFSET(group); | |
95 | pend = __raw_readl(GPIO_BASE(chip) + PEND_OFFSET + pend_offset); | |
170a4617 MS |
96 | if (!pend) |
97 | continue; | |
98 | ||
2de09262 MS |
99 | mask_offset = REG_OFFSET(group); |
100 | mask = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset); | |
170a4617 MS |
101 | pend &= ~mask; |
102 | ||
2de09262 MS |
103 | while (pend) { |
104 | int offset = fls(pend) - 1; | |
105 | int real_irq = chip->irq_base + offset; | |
106 | generic_handle_irq(real_irq); | |
107 | pend &= ~BIT(offset); | |
170a4617 MS |
108 | } |
109 | } | |
3f6065dd | 110 | chained_irq_exit(chip, desc); |
170a4617 MS |
111 | } |
112 | ||
782d8a3c | 113 | static __init int s5p_gpioint_add(struct samsung_gpio_chip *chip) |
170a4617 MS |
114 | { |
115 | static int used_gpioint_groups = 0; | |
ad739dcf | 116 | int group = chip->group; |
b76f7cdc | 117 | struct s5p_gpioint_bank *b, *bank = NULL; |
ad739dcf TG |
118 | struct irq_chip_generic *gc; |
119 | struct irq_chip_type *ct; | |
170a4617 MS |
120 | |
121 | if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT) | |
122 | return -ENOMEM; | |
123 | ||
b76f7cdc MS |
124 | list_for_each_entry(b, &banks, list) { |
125 | if (group >= b->start && group < b->start + b->nr_groups) { | |
126 | bank = b; | |
a43efddc | 127 | break; |
b76f7cdc | 128 | } |
a43efddc MS |
129 | } |
130 | if (!bank) | |
131 | return -EINVAL; | |
132 | ||
133 | if (!bank->handler) { | |
782d8a3c | 134 | bank->chips = kzalloc(sizeof(struct samsung_gpio_chip *) * |
a43efddc MS |
135 | bank->nr_groups, GFP_KERNEL); |
136 | if (!bank->chips) | |
137 | return -ENOMEM; | |
138 | ||
6845664a TG |
139 | irq_set_chained_handler(bank->irq, s5p_gpioint_handler); |
140 | irq_set_handler_data(bank->irq, bank); | |
a43efddc MS |
141 | bank->handler = s5p_gpioint_handler; |
142 | printk(KERN_INFO "Registered chained gpio int handler for interrupt %d.\n", | |
143 | bank->irq); | |
144 | } | |
145 | ||
146 | /* | |
25985edc | 147 | * chained GPIO irq has been successfully registered, allocate new gpio |
a43efddc MS |
148 | * int group and assign irq nubmers |
149 | */ | |
170a4617 MS |
150 | chip->irq_base = S5P_GPIOINT_BASE + |
151 | used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE; | |
152 | used_gpioint_groups++; | |
153 | ||
a43efddc | 154 | bank->chips[group - bank->start] = chip; |
ad739dcf TG |
155 | |
156 | gc = irq_alloc_generic_chip("s5p_gpioint", 1, chip->irq_base, | |
157 | (void __iomem *)GPIO_BASE(chip), | |
158 | handle_level_irq); | |
159 | if (!gc) | |
160 | return -ENOMEM; | |
161 | ct = gc->chip_types; | |
659fb32d | 162 | ct->chip.irq_ack = irq_gc_ack_set_bit; |
ad739dcf TG |
163 | ct->chip.irq_mask = irq_gc_mask_set_bit; |
164 | ct->chip.irq_unmask = irq_gc_mask_clr_bit; | |
165 | ct->chip.irq_set_type = s5p_gpioint_set_type, | |
1052cff3 MS |
166 | ct->regs.ack = PEND_OFFSET + REG_OFFSET(group - bank->start); |
167 | ct->regs.mask = MASK_OFFSET + REG_OFFSET(group - bank->start); | |
168 | ct->regs.type = CON_OFFSET + REG_OFFSET(group - bank->start); | |
ad739dcf TG |
169 | irq_setup_generic_chip(gc, IRQ_MSK(chip->chip.ngpio), |
170 | IRQ_GC_INIT_MASK_CACHE, | |
171 | IRQ_NOREQUEST | IRQ_NOPROBE, 0); | |
170a4617 MS |
172 | return 0; |
173 | } | |
174 | ||
175 | int __init s5p_register_gpio_interrupt(int pin) | |
176 | { | |
782d8a3c | 177 | struct samsung_gpio_chip *my_chip = samsung_gpiolib_getchip(pin); |
170a4617 MS |
178 | int offset, group; |
179 | int ret; | |
180 | ||
181 | if (!my_chip) | |
182 | return -EINVAL; | |
183 | ||
184 | offset = pin - my_chip->chip.base; | |
185 | group = my_chip->group; | |
186 | ||
187 | /* check if the group has been already registered */ | |
188 | if (my_chip->irq_base) | |
189 | return my_chip->irq_base + offset; | |
190 | ||
191 | /* register gpio group */ | |
192 | ret = s5p_gpioint_add(my_chip); | |
193 | if (ret == 0) { | |
8ce14a22 | 194 | my_chip->chip.to_irq = samsung_gpiolib_to_irq; |
170a4617 MS |
195 | printk(KERN_INFO "Registered interrupt support for gpio group %d.\n", |
196 | group); | |
197 | return my_chip->irq_base + offset; | |
198 | } | |
199 | return ret; | |
200 | } | |
a43efddc MS |
201 | |
202 | int __init s5p_register_gpioint_bank(int chain_irq, int start, int nr_groups) | |
203 | { | |
204 | struct s5p_gpioint_bank *bank; | |
205 | ||
206 | bank = kzalloc(sizeof(*bank), GFP_KERNEL); | |
207 | if (!bank) | |
208 | return -ENOMEM; | |
209 | ||
210 | bank->start = start; | |
211 | bank->nr_groups = nr_groups; | |
212 | bank->irq = chain_irq; | |
213 | ||
214 | list_add_tail(&bank->list, &banks); | |
215 | return 0; | |
216 | } |