blob: 504899a7296649cecf922065e29282189f6d3d3b [file] [log] [blame]
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +00001/*
2 * Broadcom specific AMBA
3 * GPIO driver
4 *
5 * Copyright 2011, Broadcom Corporation
6 * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
7 *
8 * Licensed under the GNU/GPL. See COPYING for details.
9 */
10
Linus Walleij74f4e0c2015-08-14 00:21:45 +020011#include <linux/gpio/driver.h>
Rafał Miłecki29976092013-12-12 13:46:03 +010012#include <linux/interrupt.h>
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +000013#include <linux/export.h>
14#include <linux/bcma/bcma.h>
15
16#include "bcma_private.h"
17
Rafał Miłecki057fcd42015-03-15 19:43:14 +010018#define BCMA_GPIO_MAX_PINS 32
19
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +000020static inline struct bcma_drv_cc *bcma_gpio_get_cc(struct gpio_chip *chip)
21{
22 return container_of(chip, struct bcma_drv_cc, gpio);
23}
24
25static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
26{
27 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
28
29 return !!bcma_chipco_gpio_in(cc, 1 << gpio);
30}
31
32static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio,
33 int value)
34{
35 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
36
37 bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
38}
39
40static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
41{
42 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
43
44 bcma_chipco_gpio_outen(cc, 1 << gpio, 0);
45 return 0;
46}
47
48static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
49 int value)
50{
51 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
52
53 bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio);
54 bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
55 return 0;
56}
57
58static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio)
59{
60 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
61
62 bcma_chipco_gpio_control(cc, 1 << gpio, 0);
63 /* clear pulldown */
64 bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0);
65 /* Set pullup */
66 bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio);
67
68 return 0;
69}
70
71static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio)
72{
73 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
74
75 /* clear pullup */
76 bcma_chipco_gpio_pullup(cc, 1 << gpio, 0);
77}
78
Rafał Miłecki0cbfc062015-02-20 11:49:05 +010079#if IS_BUILTIN(CONFIG_BCM47XX) || IS_BUILTIN(CONFIG_ARCH_BCM_5301X)
Hauke Mehrtens8f1ca262013-01-26 21:39:44 +010080
Rafał Miłecki29976092013-12-12 13:46:03 +010081static void bcma_gpio_irq_unmask(struct irq_data *d)
82{
Linus Walleij74f4e0c2015-08-14 00:21:45 +020083 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
84 struct bcma_drv_cc *cc = bcma_gpio_get_cc(gc);
Rafał Miłecki29976092013-12-12 13:46:03 +010085 int gpio = irqd_to_hwirq(d);
Hauke Mehrtens978e55d2014-01-02 19:01:08 +010086 u32 val = bcma_chipco_gpio_in(cc, BIT(gpio));
Rafał Miłecki29976092013-12-12 13:46:03 +010087
Hauke Mehrtens978e55d2014-01-02 19:01:08 +010088 bcma_chipco_gpio_polarity(cc, BIT(gpio), val);
Rafał Miłecki29976092013-12-12 13:46:03 +010089 bcma_chipco_gpio_intmask(cc, BIT(gpio), BIT(gpio));
90}
91
92static void bcma_gpio_irq_mask(struct irq_data *d)
93{
Linus Walleij74f4e0c2015-08-14 00:21:45 +020094 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
95 struct bcma_drv_cc *cc = bcma_gpio_get_cc(gc);
Rafał Miłecki29976092013-12-12 13:46:03 +010096 int gpio = irqd_to_hwirq(d);
97
98 bcma_chipco_gpio_intmask(cc, BIT(gpio), 0);
99}
100
101static struct irq_chip bcma_gpio_irq_chip = {
102 .name = "BCMA-GPIO",
103 .irq_mask = bcma_gpio_irq_mask,
104 .irq_unmask = bcma_gpio_irq_unmask,
105};
106
107static irqreturn_t bcma_gpio_irq_handler(int irq, void *dev_id)
108{
109 struct bcma_drv_cc *cc = dev_id;
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200110 struct gpio_chip *gc = &cc->gpio;
Rafał Miłecki29976092013-12-12 13:46:03 +0100111 u32 val = bcma_cc_read32(cc, BCMA_CC_GPIOIN);
112 u32 mask = bcma_cc_read32(cc, BCMA_CC_GPIOIRQ);
113 u32 pol = bcma_cc_read32(cc, BCMA_CC_GPIOPOL);
Rafał Miłeckid5ab2ad2014-01-13 20:05:17 +0100114 unsigned long irqs = (val ^ pol) & mask;
Rafał Miłecki29976092013-12-12 13:46:03 +0100115 int gpio;
116
117 if (!irqs)
118 return IRQ_NONE;
119
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200120 for_each_set_bit(gpio, &irqs, gc->ngpio)
121 generic_handle_irq(irq_find_mapping(gc->irqdomain, gpio));
Rafał Miłecki29976092013-12-12 13:46:03 +0100122 bcma_chipco_gpio_polarity(cc, irqs, val & irqs);
123
124 return IRQ_HANDLED;
125}
126
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200127static int bcma_gpio_irq_init(struct bcma_drv_cc *cc)
Rafał Miłecki29976092013-12-12 13:46:03 +0100128{
129 struct gpio_chip *chip = &cc->gpio;
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200130 int hwirq, err;
Rafał Miłecki29976092013-12-12 13:46:03 +0100131
132 if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC)
133 return 0;
134
Hauke Mehrtens85eb92e2014-11-01 16:54:55 +0100135 hwirq = bcma_core_irq(cc->core, 0);
Rafał Miłecki29976092013-12-12 13:46:03 +0100136 err = request_irq(hwirq, bcma_gpio_irq_handler, IRQF_SHARED, "gpio",
137 cc);
138 if (err)
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200139 return err;
Rafał Miłecki29976092013-12-12 13:46:03 +0100140
Hauke Mehrtens978e55d2014-01-02 19:01:08 +0100141 bcma_chipco_gpio_intmask(cc, ~0, 0);
Rafał Miłecki29976092013-12-12 13:46:03 +0100142 bcma_cc_set32(cc, BCMA_CC_IRQMASK, BCMA_CC_IRQ_GPIO);
143
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200144 err = gpiochip_irqchip_add(chip,
145 &bcma_gpio_irq_chip,
146 0,
147 handle_simple_irq,
148 IRQ_TYPE_NONE);
149 if (err) {
150 free_irq(hwirq, cc);
151 return err;
Rafał Miłecki29976092013-12-12 13:46:03 +0100152 }
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200153
154 return 0;
Rafał Miłecki29976092013-12-12 13:46:03 +0100155}
156
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200157static void bcma_gpio_irq_exit(struct bcma_drv_cc *cc)
Rafał Miłecki29976092013-12-12 13:46:03 +0100158{
Rafał Miłecki29976092013-12-12 13:46:03 +0100159 if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC)
160 return;
161
162 bcma_cc_mask32(cc, BCMA_CC_IRQMASK, ~BCMA_CC_IRQ_GPIO);
Hauke Mehrtens85eb92e2014-11-01 16:54:55 +0100163 free_irq(bcma_core_irq(cc->core, 0), cc);
Rafał Miłecki29976092013-12-12 13:46:03 +0100164}
165#else
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200166static int bcma_gpio_irq_init(struct bcma_drv_cc *cc)
Rafał Miłecki29976092013-12-12 13:46:03 +0100167{
168 return 0;
169}
170
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200171static void bcma_gpio_irq_exit(struct bcma_drv_cc *cc)
Rafał Miłecki29976092013-12-12 13:46:03 +0100172{
173}
174#endif
175
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +0000176int bcma_gpio_init(struct bcma_drv_cc *cc)
177{
Rafał Miłecki057fcd42015-03-15 19:43:14 +0100178 struct bcma_bus *bus = cc->core->bus;
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +0000179 struct gpio_chip *chip = &cc->gpio;
Rafał Miłecki29976092013-12-12 13:46:03 +0100180 int err;
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +0000181
182 chip->label = "bcma_gpio";
183 chip->owner = THIS_MODULE;
184 chip->request = bcma_gpio_request;
185 chip->free = bcma_gpio_free;
186 chip->get = bcma_gpio_get_value;
187 chip->set = bcma_gpio_set_value;
188 chip->direction_input = bcma_gpio_direction_input;
189 chip->direction_output = bcma_gpio_direction_output;
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200190 chip->owner = THIS_MODULE;
191 chip->dev = bcma_bus_get_host_dev(bus);
Rafał Miłeckia0196d12014-09-30 12:55:48 +0200192#if IS_BUILTIN(CONFIG_OF)
193 if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
194 chip->of_node = cc->core->dev.of_node;
195#endif
Rafał Miłecki057fcd42015-03-15 19:43:14 +0100196 switch (bus->chipinfo.id) {
Felix Fietkauf022ea52015-04-15 15:07:53 +0200197 case BCMA_CHIP_ID_BCM4707:
Rafał Miłecki0f8ca012014-03-20 21:09:07 +0100198 case BCMA_CHIP_ID_BCM5357:
Rafał Miłeckif0db59e2014-06-05 20:20:44 +0200199 case BCMA_CHIP_ID_BCM53572:
Rafał Miłecki0f8ca012014-03-20 21:09:07 +0100200 chip->ngpio = 32;
201 break;
202 default:
203 chip->ngpio = 16;
204 }
205
Rafał Miłecki057fcd42015-03-15 19:43:14 +0100206 /*
Felix Fietkau2d57b712015-04-15 15:07:52 +0200207 * Register SoC GPIO devices with absolute GPIO pin base.
208 * On MIPS, we don't have Device Tree and we can't use relative (per chip)
209 * GPIO numbers.
210 * On some ARM devices, user space may want to access some system GPIO
211 * pins directly, which is easier to do with a predictable GPIO base.
Rafał Miłecki057fcd42015-03-15 19:43:14 +0100212 */
Felix Fietkau2d57b712015-04-15 15:07:52 +0200213 if (IS_BUILTIN(CONFIG_BCM47XX) ||
214 cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
215 chip->base = bus->num * BCMA_GPIO_MAX_PINS;
216 else
217 chip->base = -1;
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +0000218
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200219 err = gpiochip_add(chip);
Rafał Miłecki29976092013-12-12 13:46:03 +0100220 if (err)
221 return err;
222
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200223 err = bcma_gpio_irq_init(cc);
Rafał Miłecki29976092013-12-12 13:46:03 +0100224 if (err) {
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200225 gpiochip_remove(chip);
Rafał Miłecki29976092013-12-12 13:46:03 +0100226 return err;
227 }
228
229 return 0;
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +0000230}
Hauke Mehrtensc50ae942013-02-03 23:25:33 +0100231
232int bcma_gpio_unregister(struct bcma_drv_cc *cc)
233{
Linus Walleij74f4e0c2015-08-14 00:21:45 +0200234 bcma_gpio_irq_exit(cc);
abdoulaye berthe88d5e522014-07-12 22:30:14 +0200235 gpiochip_remove(&cc->gpio);
236 return 0;
Hauke Mehrtensc50ae942013-02-03 23:25:33 +0100237}