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1/*
2 * linux/arch/arm/mach-sa1100/gpio.c
3 *
4 * Generic SA-1100 GPIO handling
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/gpio.h>
11#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/io.h>
14#include <linux/syscore_ops.h>
15#include <mach/hardware.h>
16#include <mach/irqs.h>
17
18static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
19{
20 return !!(GPLR & GPIO_GPIO(offset));
21}
22
23static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
24{
25 if (value)
26 GPSR = GPIO_GPIO(offset);
27 else
28 GPCR = GPIO_GPIO(offset);
29}
30
31static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
32{
33 unsigned long flags;
34
35 local_irq_save(flags);
36 GPDR &= ~GPIO_GPIO(offset);
37 local_irq_restore(flags);
38 return 0;
39}
40
41static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
42{
43 unsigned long flags;
44
45 local_irq_save(flags);
46 sa1100_gpio_set(chip, offset, value);
47 GPDR |= GPIO_GPIO(offset);
48 local_irq_restore(flags);
49 return 0;
50}
51
52static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
53{
54 return IRQ_GPIO0 + offset;
55}
56
57static struct gpio_chip sa1100_gpio_chip = {
58 .label = "gpio",
59 .direction_input = sa1100_direction_input,
60 .direction_output = sa1100_direction_output,
61 .set = sa1100_gpio_set,
62 .get = sa1100_gpio_get,
63 .to_irq = sa1100_to_irq,
64 .base = 0,
65 .ngpio = GPIO_MAX + 1,
66};
67
68/*
69 * SA1100 GPIO edge detection for IRQs:
70 * IRQs are generated on Falling-Edge, Rising-Edge, or both.
71 * Use this instead of directly setting GRER/GFER.
72 */
73static int GPIO_IRQ_rising_edge;
74static int GPIO_IRQ_falling_edge;
75static int GPIO_IRQ_mask;
76
77static int sa1100_gpio_type(struct irq_data *d, unsigned int type)
78{
79 unsigned int mask;
80
81 mask = BIT(d->hwirq);
82
83 if (type == IRQ_TYPE_PROBE) {
84 if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
85 return 0;
86 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
87 }
88
89 if (type & IRQ_TYPE_EDGE_RISING)
90 GPIO_IRQ_rising_edge |= mask;
91 else
92 GPIO_IRQ_rising_edge &= ~mask;
93 if (type & IRQ_TYPE_EDGE_FALLING)
94 GPIO_IRQ_falling_edge |= mask;
95 else
96 GPIO_IRQ_falling_edge &= ~mask;
97
98 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
99 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
100
101 return 0;
102}
103
104/*
105 * GPIO IRQs must be acknowledged.
106 */
107static void sa1100_gpio_ack(struct irq_data *d)
108{
109 GEDR = BIT(d->hwirq);
110}
111
112static void sa1100_gpio_mask(struct irq_data *d)
113{
114 unsigned int mask = BIT(d->hwirq);
115
116 GPIO_IRQ_mask &= ~mask;
117
118 GRER &= ~mask;
119 GFER &= ~mask;
120}
121
122static void sa1100_gpio_unmask(struct irq_data *d)
123{
124 unsigned int mask = BIT(d->hwirq);
125
126 GPIO_IRQ_mask |= mask;
127
128 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
129 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
130}
131
132static int sa1100_gpio_wake(struct irq_data *d, unsigned int on)
133{
134 if (on)
135 PWER |= BIT(d->hwirq);
136 else
137 PWER &= ~BIT(d->hwirq);
138 return 0;
139}
140
141/*
142 * This is for GPIO IRQs
143 */
144static struct irq_chip sa1100_gpio_irq_chip = {
145 .name = "GPIO",
146 .irq_ack = sa1100_gpio_ack,
147 .irq_mask = sa1100_gpio_mask,
148 .irq_unmask = sa1100_gpio_unmask,
149 .irq_set_type = sa1100_gpio_type,
150 .irq_set_wake = sa1100_gpio_wake,
151};
152
153static int sa1100_gpio_irqdomain_map(struct irq_domain *d,
154 unsigned int irq, irq_hw_number_t hwirq)
155{
156 irq_set_chip_and_handler(irq, &sa1100_gpio_irq_chip,
157 handle_edge_irq);
158 irq_set_noprobe(irq);
159
160 return 0;
161}
162
163static const struct irq_domain_ops sa1100_gpio_irqdomain_ops = {
164 .map = sa1100_gpio_irqdomain_map,
165 .xlate = irq_domain_xlate_onetwocell,
166};
167
168static struct irq_domain *sa1100_gpio_irqdomain;
169
170/*
171 * IRQ 0-11 (GPIO) handler. We enter here with the
172 * irq_controller_lock held, and IRQs disabled. Decode the IRQ
173 * and call the handler.
174 */
175static void sa1100_gpio_handler(struct irq_desc *desc)
176{
177 unsigned int irq, mask;
178
179 mask = GEDR;
180 do {
181 /*
182 * clear down all currently active IRQ sources.
183 * We will be processing them all.
184 */
185 GEDR = mask;
186
187 irq = IRQ_GPIO0;
188 do {
189 if (mask & 1)
190 generic_handle_irq(irq);
191 mask >>= 1;
192 irq++;
193 } while (mask);
194
195 mask = GEDR;
196 } while (mask);
197}
198
199static int sa1100_gpio_suspend(void)
200{
201 /*
202 * Set the appropriate edges for wakeup.
203 */
204 GRER = PWER & GPIO_IRQ_rising_edge;
205 GFER = PWER & GPIO_IRQ_falling_edge;
206
207 /*
208 * Clear any pending GPIO interrupts.
209 */
210 GEDR = GEDR;
211
212 return 0;
213}
214
215static void sa1100_gpio_resume(void)
216{
217 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
218 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
219}
220
221static struct syscore_ops sa1100_gpio_syscore_ops = {
222 .suspend = sa1100_gpio_suspend,
223 .resume = sa1100_gpio_resume,
224};
225
226static int __init sa1100_gpio_init_devicefs(void)
227{
228 register_syscore_ops(&sa1100_gpio_syscore_ops);
229 return 0;
230}
231
232device_initcall(sa1100_gpio_init_devicefs);
233
234void __init sa1100_init_gpio(void)
235{
236 /* clear all GPIO edge detects */
237 GFER = 0;
238 GRER = 0;
239 GEDR = -1;
240
241 gpiochip_add_data(&sa1100_gpio_chip, NULL);
242
243 sa1100_gpio_irqdomain = irq_domain_add_simple(NULL,
244 28, IRQ_GPIO0,
245 &sa1100_gpio_irqdomain_ops, NULL);
246
247 /*
248 * Install handlers for GPIO 0-10 edge detect interrupts
249 */
250 irq_set_chained_handler(IRQ_GPIO0_SC, sa1100_gpio_handler);
251 irq_set_chained_handler(IRQ_GPIO1_SC, sa1100_gpio_handler);
252 irq_set_chained_handler(IRQ_GPIO2_SC, sa1100_gpio_handler);
253 irq_set_chained_handler(IRQ_GPIO3_SC, sa1100_gpio_handler);
254 irq_set_chained_handler(IRQ_GPIO4_SC, sa1100_gpio_handler);
255 irq_set_chained_handler(IRQ_GPIO5_SC, sa1100_gpio_handler);
256 irq_set_chained_handler(IRQ_GPIO6_SC, sa1100_gpio_handler);
257 irq_set_chained_handler(IRQ_GPIO7_SC, sa1100_gpio_handler);
258 irq_set_chained_handler(IRQ_GPIO8_SC, sa1100_gpio_handler);
259 irq_set_chained_handler(IRQ_GPIO9_SC, sa1100_gpio_handler);
260 irq_set_chained_handler(IRQ_GPIO10_SC, sa1100_gpio_handler);
261 /*
262 * Install handler for GPIO 11-27 edge detect interrupts
263 */
264 irq_set_chained_handler(IRQ_GPIO11_27, sa1100_gpio_handler);
265
266}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/mach-sa1100/gpio.c
4 *
5 * Generic SA-1100 GPIO handling
6 */
7#include <linux/gpio/driver.h>
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/io.h>
11#include <linux/syscore_ops.h>
12#include <soc/sa1100/pwer.h>
13#include <mach/hardware.h>
14#include <mach/irqs.h>
15
16struct sa1100_gpio_chip {
17 struct gpio_chip chip;
18 void __iomem *membase;
19 int irqbase;
20 u32 irqmask;
21 u32 irqrising;
22 u32 irqfalling;
23 u32 irqwake;
24};
25
26#define sa1100_gpio_chip(x) container_of(x, struct sa1100_gpio_chip, chip)
27
28enum {
29 R_GPLR = 0x00,
30 R_GPDR = 0x04,
31 R_GPSR = 0x08,
32 R_GPCR = 0x0c,
33 R_GRER = 0x10,
34 R_GFER = 0x14,
35 R_GEDR = 0x18,
36 R_GAFR = 0x1c,
37};
38
39static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
40{
41 return readl_relaxed(sa1100_gpio_chip(chip)->membase + R_GPLR) &
42 BIT(offset);
43}
44
45static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
46{
47 int reg = value ? R_GPSR : R_GPCR;
48
49 writel_relaxed(BIT(offset), sa1100_gpio_chip(chip)->membase + reg);
50}
51
52static int sa1100_get_direction(struct gpio_chip *chip, unsigned offset)
53{
54 void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR;
55
56 return !(readl_relaxed(gpdr) & BIT(offset));
57}
58
59static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
60{
61 void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR;
62 unsigned long flags;
63
64 local_irq_save(flags);
65 writel_relaxed(readl_relaxed(gpdr) & ~BIT(offset), gpdr);
66 local_irq_restore(flags);
67
68 return 0;
69}
70
71static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
72{
73 void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR;
74 unsigned long flags;
75
76 local_irq_save(flags);
77 sa1100_gpio_set(chip, offset, value);
78 writel_relaxed(readl_relaxed(gpdr) | BIT(offset), gpdr);
79 local_irq_restore(flags);
80
81 return 0;
82}
83
84static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
85{
86 return sa1100_gpio_chip(chip)->irqbase + offset;
87}
88
89static struct sa1100_gpio_chip sa1100_gpio_chip = {
90 .chip = {
91 .label = "gpio",
92 .get_direction = sa1100_get_direction,
93 .direction_input = sa1100_direction_input,
94 .direction_output = sa1100_direction_output,
95 .set = sa1100_gpio_set,
96 .get = sa1100_gpio_get,
97 .to_irq = sa1100_to_irq,
98 .base = 0,
99 .ngpio = GPIO_MAX + 1,
100 },
101 .membase = (void *)&GPLR,
102 .irqbase = IRQ_GPIO0,
103};
104
105/*
106 * SA1100 GPIO edge detection for IRQs:
107 * IRQs are generated on Falling-Edge, Rising-Edge, or both.
108 * Use this instead of directly setting GRER/GFER.
109 */
110static void sa1100_update_edge_regs(struct sa1100_gpio_chip *sgc)
111{
112 void *base = sgc->membase;
113 u32 grer, gfer;
114
115 grer = sgc->irqrising & sgc->irqmask;
116 gfer = sgc->irqfalling & sgc->irqmask;
117
118 writel_relaxed(grer, base + R_GRER);
119 writel_relaxed(gfer, base + R_GFER);
120}
121
122static int sa1100_gpio_type(struct irq_data *d, unsigned int type)
123{
124 struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d);
125 unsigned int mask = BIT(d->hwirq);
126
127 if (type == IRQ_TYPE_PROBE) {
128 if ((sgc->irqrising | sgc->irqfalling) & mask)
129 return 0;
130 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
131 }
132
133 if (type & IRQ_TYPE_EDGE_RISING)
134 sgc->irqrising |= mask;
135 else
136 sgc->irqrising &= ~mask;
137 if (type & IRQ_TYPE_EDGE_FALLING)
138 sgc->irqfalling |= mask;
139 else
140 sgc->irqfalling &= ~mask;
141
142 sa1100_update_edge_regs(sgc);
143
144 return 0;
145}
146
147/*
148 * GPIO IRQs must be acknowledged.
149 */
150static void sa1100_gpio_ack(struct irq_data *d)
151{
152 struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d);
153
154 writel_relaxed(BIT(d->hwirq), sgc->membase + R_GEDR);
155}
156
157static void sa1100_gpio_mask(struct irq_data *d)
158{
159 struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d);
160 unsigned int mask = BIT(d->hwirq);
161
162 sgc->irqmask &= ~mask;
163
164 sa1100_update_edge_regs(sgc);
165}
166
167static void sa1100_gpio_unmask(struct irq_data *d)
168{
169 struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d);
170 unsigned int mask = BIT(d->hwirq);
171
172 sgc->irqmask |= mask;
173
174 sa1100_update_edge_regs(sgc);
175}
176
177static int sa1100_gpio_wake(struct irq_data *d, unsigned int on)
178{
179 struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d);
180 int ret = sa11x0_gpio_set_wake(d->hwirq, on);
181 if (!ret) {
182 if (on)
183 sgc->irqwake |= BIT(d->hwirq);
184 else
185 sgc->irqwake &= ~BIT(d->hwirq);
186 }
187 return ret;
188}
189
190/*
191 * This is for GPIO IRQs
192 */
193static struct irq_chip sa1100_gpio_irq_chip = {
194 .name = "GPIO",
195 .irq_ack = sa1100_gpio_ack,
196 .irq_mask = sa1100_gpio_mask,
197 .irq_unmask = sa1100_gpio_unmask,
198 .irq_set_type = sa1100_gpio_type,
199 .irq_set_wake = sa1100_gpio_wake,
200};
201
202static int sa1100_gpio_irqdomain_map(struct irq_domain *d,
203 unsigned int irq, irq_hw_number_t hwirq)
204{
205 struct sa1100_gpio_chip *sgc = d->host_data;
206
207 irq_set_chip_data(irq, sgc);
208 irq_set_chip_and_handler(irq, &sa1100_gpio_irq_chip, handle_edge_irq);
209 irq_set_probe(irq);
210
211 return 0;
212}
213
214static const struct irq_domain_ops sa1100_gpio_irqdomain_ops = {
215 .map = sa1100_gpio_irqdomain_map,
216 .xlate = irq_domain_xlate_onetwocell,
217};
218
219static struct irq_domain *sa1100_gpio_irqdomain;
220
221/*
222 * IRQ 0-11 (GPIO) handler. We enter here with the
223 * irq_controller_lock held, and IRQs disabled. Decode the IRQ
224 * and call the handler.
225 */
226static void sa1100_gpio_handler(struct irq_desc *desc)
227{
228 struct sa1100_gpio_chip *sgc = irq_desc_get_handler_data(desc);
229 unsigned int irq, mask;
230 void __iomem *gedr = sgc->membase + R_GEDR;
231
232 mask = readl_relaxed(gedr);
233 do {
234 /*
235 * clear down all currently active IRQ sources.
236 * We will be processing them all.
237 */
238 writel_relaxed(mask, gedr);
239
240 irq = sgc->irqbase;
241 do {
242 if (mask & 1)
243 generic_handle_irq(irq);
244 mask >>= 1;
245 irq++;
246 } while (mask);
247
248 mask = readl_relaxed(gedr);
249 } while (mask);
250}
251
252static int sa1100_gpio_suspend(void)
253{
254 struct sa1100_gpio_chip *sgc = &sa1100_gpio_chip;
255
256 /*
257 * Set the appropriate edges for wakeup.
258 */
259 writel_relaxed(sgc->irqwake & sgc->irqrising, sgc->membase + R_GRER);
260 writel_relaxed(sgc->irqwake & sgc->irqfalling, sgc->membase + R_GFER);
261
262 /*
263 * Clear any pending GPIO interrupts.
264 */
265 writel_relaxed(readl_relaxed(sgc->membase + R_GEDR),
266 sgc->membase + R_GEDR);
267
268 return 0;
269}
270
271static void sa1100_gpio_resume(void)
272{
273 sa1100_update_edge_regs(&sa1100_gpio_chip);
274}
275
276static struct syscore_ops sa1100_gpio_syscore_ops = {
277 .suspend = sa1100_gpio_suspend,
278 .resume = sa1100_gpio_resume,
279};
280
281static int __init sa1100_gpio_init_devicefs(void)
282{
283 register_syscore_ops(&sa1100_gpio_syscore_ops);
284 return 0;
285}
286
287device_initcall(sa1100_gpio_init_devicefs);
288
289static const int sa1100_gpio_irqs[] __initconst = {
290 /* Install handlers for GPIO 0-10 edge detect interrupts */
291 IRQ_GPIO0_SC,
292 IRQ_GPIO1_SC,
293 IRQ_GPIO2_SC,
294 IRQ_GPIO3_SC,
295 IRQ_GPIO4_SC,
296 IRQ_GPIO5_SC,
297 IRQ_GPIO6_SC,
298 IRQ_GPIO7_SC,
299 IRQ_GPIO8_SC,
300 IRQ_GPIO9_SC,
301 IRQ_GPIO10_SC,
302 /* Install handler for GPIO 11-27 edge detect interrupts */
303 IRQ_GPIO11_27,
304};
305
306void __init sa1100_init_gpio(void)
307{
308 struct sa1100_gpio_chip *sgc = &sa1100_gpio_chip;
309 int i;
310
311 /* clear all GPIO edge detects */
312 writel_relaxed(0, sgc->membase + R_GFER);
313 writel_relaxed(0, sgc->membase + R_GRER);
314 writel_relaxed(-1, sgc->membase + R_GEDR);
315
316 gpiochip_add_data(&sa1100_gpio_chip.chip, NULL);
317
318 sa1100_gpio_irqdomain = irq_domain_add_simple(NULL,
319 28, IRQ_GPIO0,
320 &sa1100_gpio_irqdomain_ops, sgc);
321
322 for (i = 0; i < ARRAY_SIZE(sa1100_gpio_irqs); i++)
323 irq_set_chained_handler_and_data(sa1100_gpio_irqs[i],
324 sa1100_gpio_handler, sgc);
325}