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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Intel Medfield MSIC GPIO driver>
4 * Copyright (c) 2011, Intel Corporation.
5 *
6 * Author: Mathias Nyman <mathias.nyman@linux.intel.com>
7 * Based on intel_pmic_gpio.c
8 */
9
10#include <linux/gpio/driver.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/mfd/intel_msic.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17
18/* the offset for the mapping of global gpio pin to irq */
19#define MSIC_GPIO_IRQ_OFFSET 0x100
20
21#define MSIC_GPIO_DIR_IN 0
22#define MSIC_GPIO_DIR_OUT BIT(5)
23#define MSIC_GPIO_TRIG_FALL BIT(1)
24#define MSIC_GPIO_TRIG_RISE BIT(2)
25
26/* masks for msic gpio output GPIOxxxxCTLO registers */
27#define MSIC_GPIO_DIR_MASK BIT(5)
28#define MSIC_GPIO_DRV_MASK BIT(4)
29#define MSIC_GPIO_REN_MASK BIT(3)
30#define MSIC_GPIO_RVAL_MASK (BIT(2) | BIT(1))
31#define MSIC_GPIO_DOUT_MASK BIT(0)
32
33/* masks for msic gpio input GPIOxxxxCTLI registers */
34#define MSIC_GPIO_GLBYP_MASK BIT(5)
35#define MSIC_GPIO_DBNC_MASK (BIT(4) | BIT(3))
36#define MSIC_GPIO_INTCNT_MASK (BIT(2) | BIT(1))
37#define MSIC_GPIO_DIN_MASK BIT(0)
38
39#define MSIC_NUM_GPIO 24
40
41struct msic_gpio {
42 struct platform_device *pdev;
43 struct mutex buslock;
44 struct gpio_chip chip;
45 int irq;
46 unsigned irq_base;
47 unsigned long trig_change_mask;
48 unsigned trig_type;
49};
50
51/*
52 * MSIC has 24 gpios, 16 low voltage (1.2-1.8v) and 8 high voltage (3v).
53 * Both the high and low voltage gpios are divided in two banks.
54 * GPIOs are numbered with GPIO0LV0 as gpio_base in the following order:
55 * GPIO0LV0..GPIO0LV7: low voltage, bank 0, gpio_base
56 * GPIO1LV0..GPIO1LV7: low voltage, bank 1, gpio_base + 8
57 * GPIO0HV0..GPIO0HV3: high voltage, bank 0, gpio_base + 16
58 * GPIO1HV0..GPIO1HV3: high voltage, bank 1, gpio_base + 20
59 */
60
61static int msic_gpio_to_ireg(unsigned offset)
62{
63 if (offset >= MSIC_NUM_GPIO)
64 return -EINVAL;
65
66 if (offset < 8)
67 return INTEL_MSIC_GPIO0LV0CTLI - offset;
68 if (offset < 16)
69 return INTEL_MSIC_GPIO1LV0CTLI - offset + 8;
70 if (offset < 20)
71 return INTEL_MSIC_GPIO0HV0CTLI - offset + 16;
72
73 return INTEL_MSIC_GPIO1HV0CTLI - offset + 20;
74}
75
76static int msic_gpio_to_oreg(unsigned offset)
77{
78 if (offset >= MSIC_NUM_GPIO)
79 return -EINVAL;
80
81 if (offset < 8)
82 return INTEL_MSIC_GPIO0LV0CTLO - offset;
83 if (offset < 16)
84 return INTEL_MSIC_GPIO1LV0CTLO - offset + 8;
85 if (offset < 20)
86 return INTEL_MSIC_GPIO0HV0CTLO - offset + 16;
87
88 return INTEL_MSIC_GPIO1HV0CTLO - offset + 20;
89}
90
91static int msic_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
92{
93 int reg;
94
95 reg = msic_gpio_to_oreg(offset);
96 if (reg < 0)
97 return reg;
98
99 return intel_msic_reg_update(reg, MSIC_GPIO_DIR_IN, MSIC_GPIO_DIR_MASK);
100}
101
102static int msic_gpio_direction_output(struct gpio_chip *chip,
103 unsigned offset, int value)
104{
105 int reg;
106 unsigned mask;
107
108 value = (!!value) | MSIC_GPIO_DIR_OUT;
109 mask = MSIC_GPIO_DIR_MASK | MSIC_GPIO_DOUT_MASK;
110
111 reg = msic_gpio_to_oreg(offset);
112 if (reg < 0)
113 return reg;
114
115 return intel_msic_reg_update(reg, value, mask);
116}
117
118static int msic_gpio_get(struct gpio_chip *chip, unsigned offset)
119{
120 u8 r;
121 int ret;
122 int reg;
123
124 reg = msic_gpio_to_ireg(offset);
125 if (reg < 0)
126 return reg;
127
128 ret = intel_msic_reg_read(reg, &r);
129 if (ret < 0)
130 return ret;
131
132 return !!(r & MSIC_GPIO_DIN_MASK);
133}
134
135static void msic_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
136{
137 int reg;
138
139 reg = msic_gpio_to_oreg(offset);
140 if (reg < 0)
141 return;
142
143 intel_msic_reg_update(reg, !!value , MSIC_GPIO_DOUT_MASK);
144}
145
146/*
147 * This is called from genirq with mg->buslock locked and
148 * irq_desc->lock held. We can not access the scu bus here, so we
149 * store the change and update in the bus_sync_unlock() function below
150 */
151static int msic_irq_type(struct irq_data *data, unsigned type)
152{
153 struct msic_gpio *mg = irq_data_get_irq_chip_data(data);
154 u32 gpio = data->irq - mg->irq_base;
155
156 if (gpio >= mg->chip.ngpio)
157 return -EINVAL;
158
159 /* mark for which gpio the trigger changed, protected by buslock */
160 mg->trig_change_mask |= (1 << gpio);
161 mg->trig_type = type;
162
163 return 0;
164}
165
166static int msic_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
167{
168 struct msic_gpio *mg = gpiochip_get_data(chip);
169 return mg->irq_base + offset;
170}
171
172static void msic_bus_lock(struct irq_data *data)
173{
174 struct msic_gpio *mg = irq_data_get_irq_chip_data(data);
175 mutex_lock(&mg->buslock);
176}
177
178static void msic_bus_sync_unlock(struct irq_data *data)
179{
180 struct msic_gpio *mg = irq_data_get_irq_chip_data(data);
181 int offset;
182 int reg;
183 u8 trig = 0;
184
185 /* We can only get one change at a time as the buslock covers the
186 entire transaction. The irq_desc->lock is dropped before we are
187 called but that is fine */
188 if (mg->trig_change_mask) {
189 offset = __ffs(mg->trig_change_mask);
190
191 reg = msic_gpio_to_ireg(offset);
192 if (reg < 0)
193 goto out;
194
195 if (mg->trig_type & IRQ_TYPE_EDGE_RISING)
196 trig |= MSIC_GPIO_TRIG_RISE;
197 if (mg->trig_type & IRQ_TYPE_EDGE_FALLING)
198 trig |= MSIC_GPIO_TRIG_FALL;
199
200 intel_msic_reg_update(reg, trig, MSIC_GPIO_INTCNT_MASK);
201 mg->trig_change_mask = 0;
202 }
203out:
204 mutex_unlock(&mg->buslock);
205}
206
207/* Firmware does all the masking and unmasking for us, no masking here. */
208static void msic_irq_unmask(struct irq_data *data) { }
209
210static void msic_irq_mask(struct irq_data *data) { }
211
212static struct irq_chip msic_irqchip = {
213 .name = "MSIC-GPIO",
214 .irq_mask = msic_irq_mask,
215 .irq_unmask = msic_irq_unmask,
216 .irq_set_type = msic_irq_type,
217 .irq_bus_lock = msic_bus_lock,
218 .irq_bus_sync_unlock = msic_bus_sync_unlock,
219};
220
221static void msic_gpio_irq_handler(struct irq_desc *desc)
222{
223 struct irq_data *data = irq_desc_get_irq_data(desc);
224 struct msic_gpio *mg = irq_data_get_irq_handler_data(data);
225 struct irq_chip *chip = irq_data_get_irq_chip(data);
226 struct intel_msic *msic = pdev_to_intel_msic(mg->pdev);
227 unsigned long pending;
228 int i;
229 int bitnr;
230 u8 pin;
231
232 for (i = 0; i < (mg->chip.ngpio / BITS_PER_BYTE); i++) {
233 intel_msic_irq_read(msic, INTEL_MSIC_GPIO0LVIRQ + i, &pin);
234 pending = pin;
235
236 for_each_set_bit(bitnr, &pending, BITS_PER_BYTE)
237 generic_handle_irq(mg->irq_base + i * BITS_PER_BYTE + bitnr);
238 }
239 chip->irq_eoi(data);
240}
241
242static int platform_msic_gpio_probe(struct platform_device *pdev)
243{
244 struct device *dev = &pdev->dev;
245 struct intel_msic_gpio_pdata *pdata = dev_get_platdata(dev);
246 struct msic_gpio *mg;
247 int irq = platform_get_irq(pdev, 0);
248 int retval;
249 int i;
250
251 if (irq < 0) {
252 dev_err(dev, "no IRQ line: %d\n", irq);
253 return irq;
254 }
255
256 if (!pdata || !pdata->gpio_base) {
257 dev_err(dev, "incorrect or missing platform data\n");
258 return -EINVAL;
259 }
260
261 mg = kzalloc(sizeof(*mg), GFP_KERNEL);
262 if (!mg)
263 return -ENOMEM;
264
265 dev_set_drvdata(dev, mg);
266
267 mg->pdev = pdev;
268 mg->irq = irq;
269 mg->irq_base = pdata->gpio_base + MSIC_GPIO_IRQ_OFFSET;
270 mg->chip.label = "msic_gpio";
271 mg->chip.direction_input = msic_gpio_direction_input;
272 mg->chip.direction_output = msic_gpio_direction_output;
273 mg->chip.get = msic_gpio_get;
274 mg->chip.set = msic_gpio_set;
275 mg->chip.to_irq = msic_gpio_to_irq;
276 mg->chip.base = pdata->gpio_base;
277 mg->chip.ngpio = MSIC_NUM_GPIO;
278 mg->chip.can_sleep = true;
279 mg->chip.parent = dev;
280
281 mutex_init(&mg->buslock);
282
283 retval = gpiochip_add_data(&mg->chip, mg);
284 if (retval) {
285 dev_err(dev, "Adding MSIC gpio chip failed\n");
286 goto err;
287 }
288
289 for (i = 0; i < mg->chip.ngpio; i++) {
290 irq_set_chip_data(i + mg->irq_base, mg);
291 irq_set_chip_and_handler(i + mg->irq_base,
292 &msic_irqchip,
293 handle_simple_irq);
294 }
295 irq_set_chained_handler_and_data(mg->irq, msic_gpio_irq_handler, mg);
296
297 return 0;
298err:
299 kfree(mg);
300 return retval;
301}
302
303static struct platform_driver platform_msic_gpio_driver = {
304 .driver = {
305 .name = "msic_gpio",
306 },
307 .probe = platform_msic_gpio_probe,
308};
309
310static int __init platform_msic_gpio_init(void)
311{
312 return platform_driver_register(&platform_msic_gpio_driver);
313}
314subsys_initcall(platform_msic_gpio_init);
1/*
2 * Intel Medfield MSIC GPIO driver>
3 * Copyright (c) 2011, Intel Corporation.
4 *
5 * Author: Mathias Nyman <mathias.nyman@linux.intel.com>
6 * Based on intel_pmic_gpio.c
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 */
22
23#include <linux/kernel.h>
24#include <linux/slab.h>
25#include <linux/interrupt.h>
26#include <linux/init.h>
27#include <linux/gpio.h>
28#include <linux/platform_device.h>
29#include <linux/mfd/intel_msic.h>
30
31/* the offset for the mapping of global gpio pin to irq */
32#define MSIC_GPIO_IRQ_OFFSET 0x100
33
34#define MSIC_GPIO_DIR_IN 0
35#define MSIC_GPIO_DIR_OUT BIT(5)
36#define MSIC_GPIO_TRIG_FALL BIT(1)
37#define MSIC_GPIO_TRIG_RISE BIT(2)
38
39/* masks for msic gpio output GPIOxxxxCTLO registers */
40#define MSIC_GPIO_DIR_MASK BIT(5)
41#define MSIC_GPIO_DRV_MASK BIT(4)
42#define MSIC_GPIO_REN_MASK BIT(3)
43#define MSIC_GPIO_RVAL_MASK (BIT(2) | BIT(1))
44#define MSIC_GPIO_DOUT_MASK BIT(0)
45
46/* masks for msic gpio input GPIOxxxxCTLI registers */
47#define MSIC_GPIO_GLBYP_MASK BIT(5)
48#define MSIC_GPIO_DBNC_MASK (BIT(4) | BIT(3))
49#define MSIC_GPIO_INTCNT_MASK (BIT(2) | BIT(1))
50#define MSIC_GPIO_DIN_MASK BIT(0)
51
52#define MSIC_NUM_GPIO 24
53
54struct msic_gpio {
55 struct platform_device *pdev;
56 struct mutex buslock;
57 struct gpio_chip chip;
58 int irq;
59 unsigned irq_base;
60 unsigned long trig_change_mask;
61 unsigned trig_type;
62};
63
64/*
65 * MSIC has 24 gpios, 16 low voltage (1.2-1.8v) and 8 high voltage (3v).
66 * Both the high and low voltage gpios are divided in two banks.
67 * GPIOs are numbered with GPIO0LV0 as gpio_base in the following order:
68 * GPIO0LV0..GPIO0LV7: low voltage, bank 0, gpio_base
69 * GPIO1LV0..GPIO1LV7: low voltage, bank 1, gpio_base + 8
70 * GPIO0HV0..GPIO0HV3: high voltage, bank 0, gpio_base + 16
71 * GPIO1HV0..GPIO1HV3: high voltage, bank 1, gpio_base + 20
72 */
73
74static int msic_gpio_to_ireg(unsigned offset)
75{
76 if (offset >= MSIC_NUM_GPIO)
77 return -EINVAL;
78
79 if (offset < 8)
80 return INTEL_MSIC_GPIO0LV0CTLI - offset;
81 if (offset < 16)
82 return INTEL_MSIC_GPIO1LV0CTLI - offset + 8;
83 if (offset < 20)
84 return INTEL_MSIC_GPIO0HV0CTLI - offset + 16;
85
86 return INTEL_MSIC_GPIO1HV0CTLI - offset + 20;
87}
88
89static int msic_gpio_to_oreg(unsigned offset)
90{
91 if (offset >= MSIC_NUM_GPIO)
92 return -EINVAL;
93
94 if (offset < 8)
95 return INTEL_MSIC_GPIO0LV0CTLO - offset;
96 if (offset < 16)
97 return INTEL_MSIC_GPIO1LV0CTLO - offset + 8;
98 if (offset < 20)
99 return INTEL_MSIC_GPIO0HV0CTLO - offset + 16;
100
101 return INTEL_MSIC_GPIO1HV0CTLO - offset + 20;
102}
103
104static int msic_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
105{
106 int reg;
107
108 reg = msic_gpio_to_oreg(offset);
109 if (reg < 0)
110 return reg;
111
112 return intel_msic_reg_update(reg, MSIC_GPIO_DIR_IN, MSIC_GPIO_DIR_MASK);
113}
114
115static int msic_gpio_direction_output(struct gpio_chip *chip,
116 unsigned offset, int value)
117{
118 int reg;
119 unsigned mask;
120
121 value = (!!value) | MSIC_GPIO_DIR_OUT;
122 mask = MSIC_GPIO_DIR_MASK | MSIC_GPIO_DOUT_MASK;
123
124 reg = msic_gpio_to_oreg(offset);
125 if (reg < 0)
126 return reg;
127
128 return intel_msic_reg_update(reg, value, mask);
129}
130
131static int msic_gpio_get(struct gpio_chip *chip, unsigned offset)
132{
133 u8 r;
134 int ret;
135 int reg;
136
137 reg = msic_gpio_to_ireg(offset);
138 if (reg < 0)
139 return reg;
140
141 ret = intel_msic_reg_read(reg, &r);
142 if (ret < 0)
143 return ret;
144
145 return !!(r & MSIC_GPIO_DIN_MASK);
146}
147
148static void msic_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
149{
150 int reg;
151
152 reg = msic_gpio_to_oreg(offset);
153 if (reg < 0)
154 return;
155
156 intel_msic_reg_update(reg, !!value , MSIC_GPIO_DOUT_MASK);
157}
158
159/*
160 * This is called from genirq with mg->buslock locked and
161 * irq_desc->lock held. We can not access the scu bus here, so we
162 * store the change and update in the bus_sync_unlock() function below
163 */
164static int msic_irq_type(struct irq_data *data, unsigned type)
165{
166 struct msic_gpio *mg = irq_data_get_irq_chip_data(data);
167 u32 gpio = data->irq - mg->irq_base;
168
169 if (gpio >= mg->chip.ngpio)
170 return -EINVAL;
171
172 /* mark for which gpio the trigger changed, protected by buslock */
173 mg->trig_change_mask |= (1 << gpio);
174 mg->trig_type = type;
175
176 return 0;
177}
178
179static int msic_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
180{
181 struct msic_gpio *mg = gpiochip_get_data(chip);
182 return mg->irq_base + offset;
183}
184
185static void msic_bus_lock(struct irq_data *data)
186{
187 struct msic_gpio *mg = irq_data_get_irq_chip_data(data);
188 mutex_lock(&mg->buslock);
189}
190
191static void msic_bus_sync_unlock(struct irq_data *data)
192{
193 struct msic_gpio *mg = irq_data_get_irq_chip_data(data);
194 int offset;
195 int reg;
196 u8 trig = 0;
197
198 /* We can only get one change at a time as the buslock covers the
199 entire transaction. The irq_desc->lock is dropped before we are
200 called but that is fine */
201 if (mg->trig_change_mask) {
202 offset = __ffs(mg->trig_change_mask);
203
204 reg = msic_gpio_to_ireg(offset);
205 if (reg < 0)
206 goto out;
207
208 if (mg->trig_type & IRQ_TYPE_EDGE_RISING)
209 trig |= MSIC_GPIO_TRIG_RISE;
210 if (mg->trig_type & IRQ_TYPE_EDGE_FALLING)
211 trig |= MSIC_GPIO_TRIG_FALL;
212
213 intel_msic_reg_update(reg, trig, MSIC_GPIO_INTCNT_MASK);
214 mg->trig_change_mask = 0;
215 }
216out:
217 mutex_unlock(&mg->buslock);
218}
219
220/* Firmware does all the masking and unmasking for us, no masking here. */
221static void msic_irq_unmask(struct irq_data *data) { }
222
223static void msic_irq_mask(struct irq_data *data) { }
224
225static struct irq_chip msic_irqchip = {
226 .name = "MSIC-GPIO",
227 .irq_mask = msic_irq_mask,
228 .irq_unmask = msic_irq_unmask,
229 .irq_set_type = msic_irq_type,
230 .irq_bus_lock = msic_bus_lock,
231 .irq_bus_sync_unlock = msic_bus_sync_unlock,
232};
233
234static void msic_gpio_irq_handler(struct irq_desc *desc)
235{
236 struct irq_data *data = irq_desc_get_irq_data(desc);
237 struct msic_gpio *mg = irq_data_get_irq_handler_data(data);
238 struct irq_chip *chip = irq_data_get_irq_chip(data);
239 struct intel_msic *msic = pdev_to_intel_msic(mg->pdev);
240 int i;
241 int bitnr;
242 u8 pin;
243 unsigned long pending = 0;
244
245 for (i = 0; i < (mg->chip.ngpio / BITS_PER_BYTE); i++) {
246 intel_msic_irq_read(msic, INTEL_MSIC_GPIO0LVIRQ + i, &pin);
247 pending = pin;
248
249 if (pending) {
250 for_each_set_bit(bitnr, &pending, BITS_PER_BYTE)
251 generic_handle_irq(mg->irq_base +
252 (i * BITS_PER_BYTE) + bitnr);
253 }
254 }
255 chip->irq_eoi(data);
256}
257
258static int platform_msic_gpio_probe(struct platform_device *pdev)
259{
260 struct device *dev = &pdev->dev;
261 struct intel_msic_gpio_pdata *pdata = dev_get_platdata(dev);
262 struct msic_gpio *mg;
263 int irq = platform_get_irq(pdev, 0);
264 int retval;
265 int i;
266
267 if (irq < 0) {
268 dev_err(dev, "no IRQ line: %d\n", irq);
269 return irq;
270 }
271
272 if (!pdata || !pdata->gpio_base) {
273 dev_err(dev, "incorrect or missing platform data\n");
274 return -EINVAL;
275 }
276
277 mg = kzalloc(sizeof(*mg), GFP_KERNEL);
278 if (!mg)
279 return -ENOMEM;
280
281 dev_set_drvdata(dev, mg);
282
283 mg->pdev = pdev;
284 mg->irq = irq;
285 mg->irq_base = pdata->gpio_base + MSIC_GPIO_IRQ_OFFSET;
286 mg->chip.label = "msic_gpio";
287 mg->chip.direction_input = msic_gpio_direction_input;
288 mg->chip.direction_output = msic_gpio_direction_output;
289 mg->chip.get = msic_gpio_get;
290 mg->chip.set = msic_gpio_set;
291 mg->chip.to_irq = msic_gpio_to_irq;
292 mg->chip.base = pdata->gpio_base;
293 mg->chip.ngpio = MSIC_NUM_GPIO;
294 mg->chip.can_sleep = true;
295 mg->chip.parent = dev;
296
297 mutex_init(&mg->buslock);
298
299 retval = gpiochip_add_data(&mg->chip, mg);
300 if (retval) {
301 dev_err(dev, "Adding MSIC gpio chip failed\n");
302 goto err;
303 }
304
305 for (i = 0; i < mg->chip.ngpio; i++) {
306 irq_set_chip_data(i + mg->irq_base, mg);
307 irq_set_chip_and_handler(i + mg->irq_base,
308 &msic_irqchip,
309 handle_simple_irq);
310 }
311 irq_set_chained_handler_and_data(mg->irq, msic_gpio_irq_handler, mg);
312
313 return 0;
314err:
315 kfree(mg);
316 return retval;
317}
318
319static struct platform_driver platform_msic_gpio_driver = {
320 .driver = {
321 .name = "msic_gpio",
322 },
323 .probe = platform_msic_gpio_probe,
324};
325
326static int __init platform_msic_gpio_init(void)
327{
328 return platform_driver_register(&platform_msic_gpio_driver);
329}
330subsys_initcall(platform_msic_gpio_init);