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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GPIO driver for the ACCES 104-DIO-48E series
4 * Copyright (C) 2016 William Breathitt Gray
5 *
6 * This driver supports the following ACCES devices: 104-DIO-48E and
7 * 104-DIO-24E.
8 */
9#include <linux/bitmap.h>
10#include <linux/bitops.h>
11#include <linux/device.h>
12#include <linux/errno.h>
13#include <linux/gpio/driver.h>
14#include <linux/io.h>
15#include <linux/ioport.h>
16#include <linux/interrupt.h>
17#include <linux/irqdesc.h>
18#include <linux/isa.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/moduleparam.h>
22#include <linux/spinlock.h>
23
24#define DIO48E_EXTENT 16
25#define MAX_NUM_DIO48E max_num_isa_dev(DIO48E_EXTENT)
26
27static unsigned int base[MAX_NUM_DIO48E];
28static unsigned int num_dio48e;
29module_param_hw_array(base, uint, ioport, &num_dio48e, 0);
30MODULE_PARM_DESC(base, "ACCES 104-DIO-48E base addresses");
31
32static unsigned int irq[MAX_NUM_DIO48E];
33module_param_hw_array(irq, uint, irq, NULL, 0);
34MODULE_PARM_DESC(irq, "ACCES 104-DIO-48E interrupt line numbers");
35
36/**
37 * struct dio48e_gpio - GPIO device private data structure
38 * @chip: instance of the gpio_chip
39 * @io_state: bit I/O state (whether bit is set to input or output)
40 * @out_state: output bits state
41 * @control: Control registers state
42 * @lock: synchronization lock to prevent I/O race conditions
43 * @base: base port address of the GPIO device
44 * @irq_mask: I/O bits affected by interrupts
45 */
46struct dio48e_gpio {
47 struct gpio_chip chip;
48 unsigned char io_state[6];
49 unsigned char out_state[6];
50 unsigned char control[2];
51 raw_spinlock_t lock;
52 unsigned base;
53 unsigned char irq_mask;
54};
55
56static int dio48e_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
57{
58 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
59 const unsigned port = offset / 8;
60 const unsigned mask = BIT(offset % 8);
61
62 if (dio48egpio->io_state[port] & mask)
63 return GPIO_LINE_DIRECTION_IN;
64
65 return GPIO_LINE_DIRECTION_OUT;
66}
67
68static int dio48e_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
69{
70 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
71 const unsigned io_port = offset / 8;
72 const unsigned int control_port = io_port / 3;
73 const unsigned control_addr = dio48egpio->base + 3 + control_port*4;
74 unsigned long flags;
75 unsigned control;
76
77 raw_spin_lock_irqsave(&dio48egpio->lock, flags);
78
79 /* Check if configuring Port C */
80 if (io_port == 2 || io_port == 5) {
81 /* Port C can be configured by nibble */
82 if (offset % 8 > 3) {
83 dio48egpio->io_state[io_port] |= 0xF0;
84 dio48egpio->control[control_port] |= BIT(3);
85 } else {
86 dio48egpio->io_state[io_port] |= 0x0F;
87 dio48egpio->control[control_port] |= BIT(0);
88 }
89 } else {
90 dio48egpio->io_state[io_port] |= 0xFF;
91 if (io_port == 0 || io_port == 3)
92 dio48egpio->control[control_port] |= BIT(4);
93 else
94 dio48egpio->control[control_port] |= BIT(1);
95 }
96
97 control = BIT(7) | dio48egpio->control[control_port];
98 outb(control, control_addr);
99 control &= ~BIT(7);
100 outb(control, control_addr);
101
102 raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
103
104 return 0;
105}
106
107static int dio48e_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
108 int value)
109{
110 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
111 const unsigned io_port = offset / 8;
112 const unsigned int control_port = io_port / 3;
113 const unsigned mask = BIT(offset % 8);
114 const unsigned control_addr = dio48egpio->base + 3 + control_port*4;
115 const unsigned out_port = (io_port > 2) ? io_port + 1 : io_port;
116 unsigned long flags;
117 unsigned control;
118
119 raw_spin_lock_irqsave(&dio48egpio->lock, flags);
120
121 /* Check if configuring Port C */
122 if (io_port == 2 || io_port == 5) {
123 /* Port C can be configured by nibble */
124 if (offset % 8 > 3) {
125 dio48egpio->io_state[io_port] &= 0x0F;
126 dio48egpio->control[control_port] &= ~BIT(3);
127 } else {
128 dio48egpio->io_state[io_port] &= 0xF0;
129 dio48egpio->control[control_port] &= ~BIT(0);
130 }
131 } else {
132 dio48egpio->io_state[io_port] &= 0x00;
133 if (io_port == 0 || io_port == 3)
134 dio48egpio->control[control_port] &= ~BIT(4);
135 else
136 dio48egpio->control[control_port] &= ~BIT(1);
137 }
138
139 if (value)
140 dio48egpio->out_state[io_port] |= mask;
141 else
142 dio48egpio->out_state[io_port] &= ~mask;
143
144 control = BIT(7) | dio48egpio->control[control_port];
145 outb(control, control_addr);
146
147 outb(dio48egpio->out_state[io_port], dio48egpio->base + out_port);
148
149 control &= ~BIT(7);
150 outb(control, control_addr);
151
152 raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
153
154 return 0;
155}
156
157static int dio48e_gpio_get(struct gpio_chip *chip, unsigned offset)
158{
159 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
160 const unsigned port = offset / 8;
161 const unsigned mask = BIT(offset % 8);
162 const unsigned in_port = (port > 2) ? port + 1 : port;
163 unsigned long flags;
164 unsigned port_state;
165
166 raw_spin_lock_irqsave(&dio48egpio->lock, flags);
167
168 /* ensure that GPIO is set for input */
169 if (!(dio48egpio->io_state[port] & mask)) {
170 raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
171 return -EINVAL;
172 }
173
174 port_state = inb(dio48egpio->base + in_port);
175
176 raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
177
178 return !!(port_state & mask);
179}
180
181static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
182
183static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
184 unsigned long *bits)
185{
186 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
187 unsigned long offset;
188 unsigned long gpio_mask;
189 unsigned int port_addr;
190 unsigned long port_state;
191
192 /* clear bits array to a clean slate */
193 bitmap_zero(bits, chip->ngpio);
194
195 for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
196 port_addr = dio48egpio->base + ports[offset / 8];
197 port_state = inb(port_addr) & gpio_mask;
198
199 bitmap_set_value8(bits, port_state, offset);
200 }
201
202 return 0;
203}
204
205static void dio48e_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
206{
207 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
208 const unsigned port = offset / 8;
209 const unsigned mask = BIT(offset % 8);
210 const unsigned out_port = (port > 2) ? port + 1 : port;
211 unsigned long flags;
212
213 raw_spin_lock_irqsave(&dio48egpio->lock, flags);
214
215 if (value)
216 dio48egpio->out_state[port] |= mask;
217 else
218 dio48egpio->out_state[port] &= ~mask;
219
220 outb(dio48egpio->out_state[port], dio48egpio->base + out_port);
221
222 raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
223}
224
225static void dio48e_gpio_set_multiple(struct gpio_chip *chip,
226 unsigned long *mask, unsigned long *bits)
227{
228 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
229 unsigned long offset;
230 unsigned long gpio_mask;
231 size_t index;
232 unsigned int port_addr;
233 unsigned long bitmask;
234 unsigned long flags;
235
236 for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
237 index = offset / 8;
238 port_addr = dio48egpio->base + ports[index];
239
240 bitmask = bitmap_get_value8(bits, offset) & gpio_mask;
241
242 raw_spin_lock_irqsave(&dio48egpio->lock, flags);
243
244 /* update output state data and set device gpio register */
245 dio48egpio->out_state[index] &= ~gpio_mask;
246 dio48egpio->out_state[index] |= bitmask;
247 outb(dio48egpio->out_state[index], port_addr);
248
249 raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
250 }
251}
252
253static void dio48e_irq_ack(struct irq_data *data)
254{
255}
256
257static void dio48e_irq_mask(struct irq_data *data)
258{
259 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
260 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
261 const unsigned long offset = irqd_to_hwirq(data);
262 unsigned long flags;
263
264 /* only bit 3 on each respective Port C supports interrupts */
265 if (offset != 19 && offset != 43)
266 return;
267
268 raw_spin_lock_irqsave(&dio48egpio->lock, flags);
269
270 if (offset == 19)
271 dio48egpio->irq_mask &= ~BIT(0);
272 else
273 dio48egpio->irq_mask &= ~BIT(1);
274
275 if (!dio48egpio->irq_mask)
276 /* disable interrupts */
277 inb(dio48egpio->base + 0xB);
278
279 raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
280}
281
282static void dio48e_irq_unmask(struct irq_data *data)
283{
284 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
285 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
286 const unsigned long offset = irqd_to_hwirq(data);
287 unsigned long flags;
288
289 /* only bit 3 on each respective Port C supports interrupts */
290 if (offset != 19 && offset != 43)
291 return;
292
293 raw_spin_lock_irqsave(&dio48egpio->lock, flags);
294
295 if (!dio48egpio->irq_mask) {
296 /* enable interrupts */
297 outb(0x00, dio48egpio->base + 0xF);
298 outb(0x00, dio48egpio->base + 0xB);
299 }
300
301 if (offset == 19)
302 dio48egpio->irq_mask |= BIT(0);
303 else
304 dio48egpio->irq_mask |= BIT(1);
305
306 raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
307}
308
309static int dio48e_irq_set_type(struct irq_data *data, unsigned flow_type)
310{
311 const unsigned long offset = irqd_to_hwirq(data);
312
313 /* only bit 3 on each respective Port C supports interrupts */
314 if (offset != 19 && offset != 43)
315 return -EINVAL;
316
317 if (flow_type != IRQ_TYPE_NONE && flow_type != IRQ_TYPE_EDGE_RISING)
318 return -EINVAL;
319
320 return 0;
321}
322
323static struct irq_chip dio48e_irqchip = {
324 .name = "104-dio-48e",
325 .irq_ack = dio48e_irq_ack,
326 .irq_mask = dio48e_irq_mask,
327 .irq_unmask = dio48e_irq_unmask,
328 .irq_set_type = dio48e_irq_set_type
329};
330
331static irqreturn_t dio48e_irq_handler(int irq, void *dev_id)
332{
333 struct dio48e_gpio *const dio48egpio = dev_id;
334 struct gpio_chip *const chip = &dio48egpio->chip;
335 const unsigned long irq_mask = dio48egpio->irq_mask;
336 unsigned long gpio;
337
338 for_each_set_bit(gpio, &irq_mask, 2)
339 generic_handle_irq(irq_find_mapping(chip->irq.domain,
340 19 + gpio*24));
341
342 raw_spin_lock(&dio48egpio->lock);
343
344 outb(0x00, dio48egpio->base + 0xF);
345
346 raw_spin_unlock(&dio48egpio->lock);
347
348 return IRQ_HANDLED;
349}
350
351#define DIO48E_NGPIO 48
352static const char *dio48e_names[DIO48E_NGPIO] = {
353 "PPI Group 0 Port A 0", "PPI Group 0 Port A 1", "PPI Group 0 Port A 2",
354 "PPI Group 0 Port A 3", "PPI Group 0 Port A 4", "PPI Group 0 Port A 5",
355 "PPI Group 0 Port A 6", "PPI Group 0 Port A 7", "PPI Group 0 Port B 0",
356 "PPI Group 0 Port B 1", "PPI Group 0 Port B 2", "PPI Group 0 Port B 3",
357 "PPI Group 0 Port B 4", "PPI Group 0 Port B 5", "PPI Group 0 Port B 6",
358 "PPI Group 0 Port B 7", "PPI Group 0 Port C 0", "PPI Group 0 Port C 1",
359 "PPI Group 0 Port C 2", "PPI Group 0 Port C 3", "PPI Group 0 Port C 4",
360 "PPI Group 0 Port C 5", "PPI Group 0 Port C 6", "PPI Group 0 Port C 7",
361 "PPI Group 1 Port A 0", "PPI Group 1 Port A 1", "PPI Group 1 Port A 2",
362 "PPI Group 1 Port A 3", "PPI Group 1 Port A 4", "PPI Group 1 Port A 5",
363 "PPI Group 1 Port A 6", "PPI Group 1 Port A 7", "PPI Group 1 Port B 0",
364 "PPI Group 1 Port B 1", "PPI Group 1 Port B 2", "PPI Group 1 Port B 3",
365 "PPI Group 1 Port B 4", "PPI Group 1 Port B 5", "PPI Group 1 Port B 6",
366 "PPI Group 1 Port B 7", "PPI Group 1 Port C 0", "PPI Group 1 Port C 1",
367 "PPI Group 1 Port C 2", "PPI Group 1 Port C 3", "PPI Group 1 Port C 4",
368 "PPI Group 1 Port C 5", "PPI Group 1 Port C 6", "PPI Group 1 Port C 7"
369};
370
371static int dio48e_irq_init_hw(struct gpio_chip *gc)
372{
373 struct dio48e_gpio *const dio48egpio = gpiochip_get_data(gc);
374
375 /* Disable IRQ by default */
376 inb(dio48egpio->base + 0xB);
377
378 return 0;
379}
380
381static int dio48e_probe(struct device *dev, unsigned int id)
382{
383 struct dio48e_gpio *dio48egpio;
384 const char *const name = dev_name(dev);
385 struct gpio_irq_chip *girq;
386 int err;
387
388 dio48egpio = devm_kzalloc(dev, sizeof(*dio48egpio), GFP_KERNEL);
389 if (!dio48egpio)
390 return -ENOMEM;
391
392 if (!devm_request_region(dev, base[id], DIO48E_EXTENT, name)) {
393 dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
394 base[id], base[id] + DIO48E_EXTENT);
395 return -EBUSY;
396 }
397
398 dio48egpio->chip.label = name;
399 dio48egpio->chip.parent = dev;
400 dio48egpio->chip.owner = THIS_MODULE;
401 dio48egpio->chip.base = -1;
402 dio48egpio->chip.ngpio = DIO48E_NGPIO;
403 dio48egpio->chip.names = dio48e_names;
404 dio48egpio->chip.get_direction = dio48e_gpio_get_direction;
405 dio48egpio->chip.direction_input = dio48e_gpio_direction_input;
406 dio48egpio->chip.direction_output = dio48e_gpio_direction_output;
407 dio48egpio->chip.get = dio48e_gpio_get;
408 dio48egpio->chip.get_multiple = dio48e_gpio_get_multiple;
409 dio48egpio->chip.set = dio48e_gpio_set;
410 dio48egpio->chip.set_multiple = dio48e_gpio_set_multiple;
411 dio48egpio->base = base[id];
412
413 girq = &dio48egpio->chip.irq;
414 girq->chip = &dio48e_irqchip;
415 /* This will let us handle the parent IRQ in the driver */
416 girq->parent_handler = NULL;
417 girq->num_parents = 0;
418 girq->parents = NULL;
419 girq->default_type = IRQ_TYPE_NONE;
420 girq->handler = handle_edge_irq;
421 girq->init_hw = dio48e_irq_init_hw;
422
423 raw_spin_lock_init(&dio48egpio->lock);
424
425 /* initialize all GPIO as output */
426 outb(0x80, base[id] + 3);
427 outb(0x00, base[id]);
428 outb(0x00, base[id] + 1);
429 outb(0x00, base[id] + 2);
430 outb(0x00, base[id] + 3);
431 outb(0x80, base[id] + 7);
432 outb(0x00, base[id] + 4);
433 outb(0x00, base[id] + 5);
434 outb(0x00, base[id] + 6);
435 outb(0x00, base[id] + 7);
436
437 err = devm_gpiochip_add_data(dev, &dio48egpio->chip, dio48egpio);
438 if (err) {
439 dev_err(dev, "GPIO registering failed (%d)\n", err);
440 return err;
441 }
442
443 err = devm_request_irq(dev, irq[id], dio48e_irq_handler, 0, name,
444 dio48egpio);
445 if (err) {
446 dev_err(dev, "IRQ handler registering failed (%d)\n", err);
447 return err;
448 }
449
450 return 0;
451}
452
453static struct isa_driver dio48e_driver = {
454 .probe = dio48e_probe,
455 .driver = {
456 .name = "104-dio-48e"
457 },
458};
459module_isa_driver(dio48e_driver, num_dio48e);
460
461MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
462MODULE_DESCRIPTION("ACCES 104-DIO-48E GPIO driver");
463MODULE_LICENSE("GPL v2");