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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GPIOs on MPC512x/8349/8572/8610/QorIQ and compatible
4 *
5 * Copyright (C) 2008 Peter Korsgaard <jacmet@sunsite.dk>
6 * Copyright (C) 2016 Freescale Semiconductor Inc.
7 */
8
9#include <linux/acpi.h>
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/spinlock.h>
13#include <linux/io.h>
14#include <linux/of.h>
15#include <linux/of_gpio.h>
16#include <linux/of_address.h>
17#include <linux/of_irq.h>
18#include <linux/of_platform.h>
19#include <linux/property.h>
20#include <linux/mod_devicetable.h>
21#include <linux/slab.h>
22#include <linux/irq.h>
23#include <linux/gpio/driver.h>
24#include <linux/bitops.h>
25#include <linux/interrupt.h>
26
27#define MPC8XXX_GPIO_PINS 32
28
29#define GPIO_DIR 0x00
30#define GPIO_ODR 0x04
31#define GPIO_DAT 0x08
32#define GPIO_IER 0x0c
33#define GPIO_IMR 0x10
34#define GPIO_ICR 0x14
35#define GPIO_ICR2 0x18
36#define GPIO_IBE 0x18
37
38struct mpc8xxx_gpio_chip {
39 struct gpio_chip gc;
40 void __iomem *regs;
41 raw_spinlock_t lock;
42
43 int (*direction_output)(struct gpio_chip *chip,
44 unsigned offset, int value);
45
46 struct irq_domain *irq;
47 int irqn;
48};
49
50/*
51 * This hardware has a big endian bit assignment such that GPIO line 0 is
52 * connected to bit 31, line 1 to bit 30 ... line 31 to bit 0.
53 * This inline helper give the right bitmask for a certain line.
54 */
55static inline u32 mpc_pin2mask(unsigned int offset)
56{
57 return BIT(31 - offset);
58}
59
60/* Workaround GPIO 1 errata on MPC8572/MPC8536. The status of GPIOs
61 * defined as output cannot be determined by reading GPDAT register,
62 * so we use shadow data register instead. The status of input pins
63 * is determined by reading GPDAT register.
64 */
65static int mpc8572_gpio_get(struct gpio_chip *gc, unsigned int gpio)
66{
67 u32 val;
68 struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
69 u32 out_mask, out_shadow;
70
71 out_mask = gc->read_reg(mpc8xxx_gc->regs + GPIO_DIR);
72 val = gc->read_reg(mpc8xxx_gc->regs + GPIO_DAT) & ~out_mask;
73 out_shadow = gc->bgpio_data & out_mask;
74
75 return !!((val | out_shadow) & mpc_pin2mask(gpio));
76}
77
78static int mpc5121_gpio_dir_out(struct gpio_chip *gc,
79 unsigned int gpio, int val)
80{
81 struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
82 /* GPIO 28..31 are input only on MPC5121 */
83 if (gpio >= 28)
84 return -EINVAL;
85
86 return mpc8xxx_gc->direction_output(gc, gpio, val);
87}
88
89static int mpc5125_gpio_dir_out(struct gpio_chip *gc,
90 unsigned int gpio, int val)
91{
92 struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
93 /* GPIO 0..3 are input only on MPC5125 */
94 if (gpio <= 3)
95 return -EINVAL;
96
97 return mpc8xxx_gc->direction_output(gc, gpio, val);
98}
99
100static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
101{
102 struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
103
104 if (mpc8xxx_gc->irq && offset < MPC8XXX_GPIO_PINS)
105 return irq_create_mapping(mpc8xxx_gc->irq, offset);
106 else
107 return -ENXIO;
108}
109
110static irqreturn_t mpc8xxx_gpio_irq_cascade(int irq, void *data)
111{
112 struct mpc8xxx_gpio_chip *mpc8xxx_gc = data;
113 struct gpio_chip *gc = &mpc8xxx_gc->gc;
114 unsigned long mask;
115 int i;
116
117 mask = gc->read_reg(mpc8xxx_gc->regs + GPIO_IER)
118 & gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR);
119 for_each_set_bit(i, &mask, 32)
120 generic_handle_domain_irq(mpc8xxx_gc->irq, 31 - i);
121
122 return IRQ_HANDLED;
123}
124
125static void mpc8xxx_irq_unmask(struct irq_data *d)
126{
127 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
128 struct gpio_chip *gc = &mpc8xxx_gc->gc;
129 unsigned long flags;
130
131 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
132
133 gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR,
134 gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR)
135 | mpc_pin2mask(irqd_to_hwirq(d)));
136
137 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
138}
139
140static void mpc8xxx_irq_mask(struct irq_data *d)
141{
142 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
143 struct gpio_chip *gc = &mpc8xxx_gc->gc;
144 unsigned long flags;
145
146 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
147
148 gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR,
149 gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR)
150 & ~mpc_pin2mask(irqd_to_hwirq(d)));
151
152 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
153}
154
155static void mpc8xxx_irq_ack(struct irq_data *d)
156{
157 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
158 struct gpio_chip *gc = &mpc8xxx_gc->gc;
159
160 gc->write_reg(mpc8xxx_gc->regs + GPIO_IER,
161 mpc_pin2mask(irqd_to_hwirq(d)));
162}
163
164static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
165{
166 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
167 struct gpio_chip *gc = &mpc8xxx_gc->gc;
168 unsigned long flags;
169
170 switch (flow_type) {
171 case IRQ_TYPE_EDGE_FALLING:
172 case IRQ_TYPE_LEVEL_LOW:
173 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
174 gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
175 gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
176 | mpc_pin2mask(irqd_to_hwirq(d)));
177 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
178 break;
179
180 case IRQ_TYPE_EDGE_BOTH:
181 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
182 gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
183 gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
184 & ~mpc_pin2mask(irqd_to_hwirq(d)));
185 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
186 break;
187
188 default:
189 return -EINVAL;
190 }
191
192 return 0;
193}
194
195static int mpc512x_irq_set_type(struct irq_data *d, unsigned int flow_type)
196{
197 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
198 struct gpio_chip *gc = &mpc8xxx_gc->gc;
199 unsigned long gpio = irqd_to_hwirq(d);
200 void __iomem *reg;
201 unsigned int shift;
202 unsigned long flags;
203
204 if (gpio < 16) {
205 reg = mpc8xxx_gc->regs + GPIO_ICR;
206 shift = (15 - gpio) * 2;
207 } else {
208 reg = mpc8xxx_gc->regs + GPIO_ICR2;
209 shift = (15 - (gpio % 16)) * 2;
210 }
211
212 switch (flow_type) {
213 case IRQ_TYPE_EDGE_FALLING:
214 case IRQ_TYPE_LEVEL_LOW:
215 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
216 gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift))
217 | (2 << shift));
218 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
219 break;
220
221 case IRQ_TYPE_EDGE_RISING:
222 case IRQ_TYPE_LEVEL_HIGH:
223 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
224 gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift))
225 | (1 << shift));
226 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
227 break;
228
229 case IRQ_TYPE_EDGE_BOTH:
230 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
231 gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift)));
232 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
233 break;
234
235 default:
236 return -EINVAL;
237 }
238
239 return 0;
240}
241
242static struct irq_chip mpc8xxx_irq_chip = {
243 .name = "mpc8xxx-gpio",
244 .irq_unmask = mpc8xxx_irq_unmask,
245 .irq_mask = mpc8xxx_irq_mask,
246 .irq_ack = mpc8xxx_irq_ack,
247 /* this might get overwritten in mpc8xxx_probe() */
248 .irq_set_type = mpc8xxx_irq_set_type,
249};
250
251static int mpc8xxx_gpio_irq_map(struct irq_domain *h, unsigned int irq,
252 irq_hw_number_t hwirq)
253{
254 irq_set_chip_data(irq, h->host_data);
255 irq_set_chip_and_handler(irq, &mpc8xxx_irq_chip, handle_edge_irq);
256
257 return 0;
258}
259
260static const struct irq_domain_ops mpc8xxx_gpio_irq_ops = {
261 .map = mpc8xxx_gpio_irq_map,
262 .xlate = irq_domain_xlate_twocell,
263};
264
265struct mpc8xxx_gpio_devtype {
266 int (*gpio_dir_out)(struct gpio_chip *, unsigned int, int);
267 int (*gpio_get)(struct gpio_chip *, unsigned int);
268 int (*irq_set_type)(struct irq_data *, unsigned int);
269};
270
271static const struct mpc8xxx_gpio_devtype mpc512x_gpio_devtype = {
272 .gpio_dir_out = mpc5121_gpio_dir_out,
273 .irq_set_type = mpc512x_irq_set_type,
274};
275
276static const struct mpc8xxx_gpio_devtype mpc5125_gpio_devtype = {
277 .gpio_dir_out = mpc5125_gpio_dir_out,
278 .irq_set_type = mpc512x_irq_set_type,
279};
280
281static const struct mpc8xxx_gpio_devtype mpc8572_gpio_devtype = {
282 .gpio_get = mpc8572_gpio_get,
283};
284
285static const struct mpc8xxx_gpio_devtype mpc8xxx_gpio_devtype_default = {
286 .irq_set_type = mpc8xxx_irq_set_type,
287};
288
289static const struct of_device_id mpc8xxx_gpio_ids[] = {
290 { .compatible = "fsl,mpc8349-gpio", },
291 { .compatible = "fsl,mpc8572-gpio", .data = &mpc8572_gpio_devtype, },
292 { .compatible = "fsl,mpc8610-gpio", },
293 { .compatible = "fsl,mpc5121-gpio", .data = &mpc512x_gpio_devtype, },
294 { .compatible = "fsl,mpc5125-gpio", .data = &mpc5125_gpio_devtype, },
295 { .compatible = "fsl,pq3-gpio", },
296 { .compatible = "fsl,ls1028a-gpio", },
297 { .compatible = "fsl,ls1088a-gpio", },
298 { .compatible = "fsl,qoriq-gpio", },
299 {}
300};
301
302static int mpc8xxx_probe(struct platform_device *pdev)
303{
304 struct device_node *np = pdev->dev.of_node;
305 struct mpc8xxx_gpio_chip *mpc8xxx_gc;
306 struct gpio_chip *gc;
307 const struct mpc8xxx_gpio_devtype *devtype = NULL;
308 struct fwnode_handle *fwnode;
309 int ret;
310
311 mpc8xxx_gc = devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc), GFP_KERNEL);
312 if (!mpc8xxx_gc)
313 return -ENOMEM;
314
315 platform_set_drvdata(pdev, mpc8xxx_gc);
316
317 raw_spin_lock_init(&mpc8xxx_gc->lock);
318
319 mpc8xxx_gc->regs = devm_platform_ioremap_resource(pdev, 0);
320 if (IS_ERR(mpc8xxx_gc->regs))
321 return PTR_ERR(mpc8xxx_gc->regs);
322
323 gc = &mpc8xxx_gc->gc;
324 gc->parent = &pdev->dev;
325
326 if (device_property_read_bool(&pdev->dev, "little-endian")) {
327 ret = bgpio_init(gc, &pdev->dev, 4,
328 mpc8xxx_gc->regs + GPIO_DAT,
329 NULL, NULL,
330 mpc8xxx_gc->regs + GPIO_DIR, NULL,
331 BGPIOF_BIG_ENDIAN);
332 if (ret)
333 return ret;
334 dev_dbg(&pdev->dev, "GPIO registers are LITTLE endian\n");
335 } else {
336 ret = bgpio_init(gc, &pdev->dev, 4,
337 mpc8xxx_gc->regs + GPIO_DAT,
338 NULL, NULL,
339 mpc8xxx_gc->regs + GPIO_DIR, NULL,
340 BGPIOF_BIG_ENDIAN
341 | BGPIOF_BIG_ENDIAN_BYTE_ORDER);
342 if (ret)
343 return ret;
344 dev_dbg(&pdev->dev, "GPIO registers are BIG endian\n");
345 }
346
347 mpc8xxx_gc->direction_output = gc->direction_output;
348
349 devtype = device_get_match_data(&pdev->dev);
350 if (!devtype)
351 devtype = &mpc8xxx_gpio_devtype_default;
352
353 /*
354 * It's assumed that only a single type of gpio controller is available
355 * on the current machine, so overwriting global data is fine.
356 */
357 if (devtype->irq_set_type)
358 mpc8xxx_irq_chip.irq_set_type = devtype->irq_set_type;
359
360 if (devtype->gpio_dir_out)
361 gc->direction_output = devtype->gpio_dir_out;
362 if (devtype->gpio_get)
363 gc->get = devtype->gpio_get;
364
365 gc->to_irq = mpc8xxx_gpio_to_irq;
366
367 /*
368 * The GPIO Input Buffer Enable register(GPIO_IBE) is used to control
369 * the input enable of each individual GPIO port. When an individual
370 * GPIO port’s direction is set to input (GPIO_GPDIR[DRn=0]), the
371 * associated input enable must be set (GPIOxGPIE[IEn]=1) to propagate
372 * the port value to the GPIO Data Register.
373 */
374 fwnode = dev_fwnode(&pdev->dev);
375 if (of_device_is_compatible(np, "fsl,qoriq-gpio") ||
376 of_device_is_compatible(np, "fsl,ls1028a-gpio") ||
377 of_device_is_compatible(np, "fsl,ls1088a-gpio") ||
378 is_acpi_node(fwnode))
379 gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
380
381 ret = devm_gpiochip_add_data(&pdev->dev, gc, mpc8xxx_gc);
382 if (ret) {
383 dev_err(&pdev->dev,
384 "GPIO chip registration failed with status %d\n", ret);
385 return ret;
386 }
387
388 mpc8xxx_gc->irqn = platform_get_irq(pdev, 0);
389 if (mpc8xxx_gc->irqn < 0)
390 return mpc8xxx_gc->irqn;
391
392 mpc8xxx_gc->irq = irq_domain_create_linear(fwnode,
393 MPC8XXX_GPIO_PINS,
394 &mpc8xxx_gpio_irq_ops,
395 mpc8xxx_gc);
396
397 if (!mpc8xxx_gc->irq)
398 return 0;
399
400 /* ack and mask all irqs */
401 gc->write_reg(mpc8xxx_gc->regs + GPIO_IER, 0xffffffff);
402 gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR, 0);
403
404 ret = devm_request_irq(&pdev->dev, mpc8xxx_gc->irqn,
405 mpc8xxx_gpio_irq_cascade,
406 IRQF_NO_THREAD | IRQF_SHARED, "gpio-cascade",
407 mpc8xxx_gc);
408 if (ret) {
409 dev_err(&pdev->dev,
410 "failed to devm_request_irq(%d), ret = %d\n",
411 mpc8xxx_gc->irqn, ret);
412 goto err;
413 }
414
415 return 0;
416err:
417 irq_domain_remove(mpc8xxx_gc->irq);
418 return ret;
419}
420
421static int mpc8xxx_remove(struct platform_device *pdev)
422{
423 struct mpc8xxx_gpio_chip *mpc8xxx_gc = platform_get_drvdata(pdev);
424
425 if (mpc8xxx_gc->irq) {
426 irq_set_chained_handler_and_data(mpc8xxx_gc->irqn, NULL, NULL);
427 irq_domain_remove(mpc8xxx_gc->irq);
428 }
429
430 return 0;
431}
432
433#ifdef CONFIG_ACPI
434static const struct acpi_device_id gpio_acpi_ids[] = {
435 {"NXP0031",},
436 { }
437};
438MODULE_DEVICE_TABLE(acpi, gpio_acpi_ids);
439#endif
440
441static struct platform_driver mpc8xxx_plat_driver = {
442 .probe = mpc8xxx_probe,
443 .remove = mpc8xxx_remove,
444 .driver = {
445 .name = "gpio-mpc8xxx",
446 .of_match_table = mpc8xxx_gpio_ids,
447 .acpi_match_table = ACPI_PTR(gpio_acpi_ids),
448 },
449};
450
451static int __init mpc8xxx_init(void)
452{
453 return platform_driver_register(&mpc8xxx_plat_driver);
454}
455
456arch_initcall(mpc8xxx_init);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GPIOs on MPC512x/8349/8572/8610/QorIQ and compatible
4 *
5 * Copyright (C) 2008 Peter Korsgaard <jacmet@sunsite.dk>
6 * Copyright (C) 2016 Freescale Semiconductor Inc.
7 */
8
9#include <linux/acpi.h>
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/platform_device.h>
13#include <linux/spinlock.h>
14#include <linux/io.h>
15#include <linux/of.h>
16#include <linux/property.h>
17#include <linux/mod_devicetable.h>
18#include <linux/slab.h>
19#include <linux/irq.h>
20#include <linux/gpio/driver.h>
21#include <linux/bitops.h>
22#include <linux/interrupt.h>
23
24#define MPC8XXX_GPIO_PINS 32
25
26#define GPIO_DIR 0x00
27#define GPIO_ODR 0x04
28#define GPIO_DAT 0x08
29#define GPIO_IER 0x0c
30#define GPIO_IMR 0x10
31#define GPIO_ICR 0x14
32#define GPIO_ICR2 0x18
33#define GPIO_IBE 0x18
34
35struct mpc8xxx_gpio_chip {
36 struct gpio_chip gc;
37 void __iomem *regs;
38 raw_spinlock_t lock;
39
40 int (*direction_output)(struct gpio_chip *chip,
41 unsigned offset, int value);
42
43 struct irq_domain *irq;
44 int irqn;
45};
46
47/*
48 * This hardware has a big endian bit assignment such that GPIO line 0 is
49 * connected to bit 31, line 1 to bit 30 ... line 31 to bit 0.
50 * This inline helper give the right bitmask for a certain line.
51 */
52static inline u32 mpc_pin2mask(unsigned int offset)
53{
54 return BIT(31 - offset);
55}
56
57/* Workaround GPIO 1 errata on MPC8572/MPC8536. The status of GPIOs
58 * defined as output cannot be determined by reading GPDAT register,
59 * so we use shadow data register instead. The status of input pins
60 * is determined by reading GPDAT register.
61 */
62static int mpc8572_gpio_get(struct gpio_chip *gc, unsigned int gpio)
63{
64 u32 val;
65 struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
66 u32 out_mask, out_shadow;
67
68 out_mask = gc->read_reg(mpc8xxx_gc->regs + GPIO_DIR);
69 val = gc->read_reg(mpc8xxx_gc->regs + GPIO_DAT) & ~out_mask;
70 out_shadow = gc->bgpio_data & out_mask;
71
72 return !!((val | out_shadow) & mpc_pin2mask(gpio));
73}
74
75static int mpc5121_gpio_dir_out(struct gpio_chip *gc,
76 unsigned int gpio, int val)
77{
78 struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
79 /* GPIO 28..31 are input only on MPC5121 */
80 if (gpio >= 28)
81 return -EINVAL;
82
83 return mpc8xxx_gc->direction_output(gc, gpio, val);
84}
85
86static int mpc5125_gpio_dir_out(struct gpio_chip *gc,
87 unsigned int gpio, int val)
88{
89 struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
90 /* GPIO 0..3 are input only on MPC5125 */
91 if (gpio <= 3)
92 return -EINVAL;
93
94 return mpc8xxx_gc->direction_output(gc, gpio, val);
95}
96
97static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
98{
99 struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
100
101 if (mpc8xxx_gc->irq && offset < MPC8XXX_GPIO_PINS)
102 return irq_create_mapping(mpc8xxx_gc->irq, offset);
103 else
104 return -ENXIO;
105}
106
107static irqreturn_t mpc8xxx_gpio_irq_cascade(int irq, void *data)
108{
109 struct mpc8xxx_gpio_chip *mpc8xxx_gc = data;
110 struct gpio_chip *gc = &mpc8xxx_gc->gc;
111 unsigned long mask;
112 int i;
113
114 mask = gc->read_reg(mpc8xxx_gc->regs + GPIO_IER)
115 & gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR);
116 for_each_set_bit(i, &mask, 32)
117 generic_handle_domain_irq(mpc8xxx_gc->irq, 31 - i);
118
119 return IRQ_HANDLED;
120}
121
122static void mpc8xxx_irq_unmask(struct irq_data *d)
123{
124 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
125 struct gpio_chip *gc = &mpc8xxx_gc->gc;
126 unsigned long flags;
127
128 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
129
130 gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR,
131 gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR)
132 | mpc_pin2mask(irqd_to_hwirq(d)));
133
134 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
135}
136
137static void mpc8xxx_irq_mask(struct irq_data *d)
138{
139 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
140 struct gpio_chip *gc = &mpc8xxx_gc->gc;
141 unsigned long flags;
142
143 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
144
145 gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR,
146 gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR)
147 & ~mpc_pin2mask(irqd_to_hwirq(d)));
148
149 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
150}
151
152static void mpc8xxx_irq_ack(struct irq_data *d)
153{
154 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
155 struct gpio_chip *gc = &mpc8xxx_gc->gc;
156
157 gc->write_reg(mpc8xxx_gc->regs + GPIO_IER,
158 mpc_pin2mask(irqd_to_hwirq(d)));
159}
160
161static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
162{
163 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
164 struct gpio_chip *gc = &mpc8xxx_gc->gc;
165 unsigned long flags;
166
167 switch (flow_type) {
168 case IRQ_TYPE_EDGE_FALLING:
169 case IRQ_TYPE_LEVEL_LOW:
170 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
171 gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
172 gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
173 | mpc_pin2mask(irqd_to_hwirq(d)));
174 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
175 break;
176
177 case IRQ_TYPE_EDGE_BOTH:
178 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
179 gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
180 gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
181 & ~mpc_pin2mask(irqd_to_hwirq(d)));
182 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
183 break;
184
185 default:
186 return -EINVAL;
187 }
188
189 return 0;
190}
191
192static int mpc512x_irq_set_type(struct irq_data *d, unsigned int flow_type)
193{
194 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
195 struct gpio_chip *gc = &mpc8xxx_gc->gc;
196 unsigned long gpio = irqd_to_hwirq(d);
197 void __iomem *reg;
198 unsigned int shift;
199 unsigned long flags;
200
201 if (gpio < 16) {
202 reg = mpc8xxx_gc->regs + GPIO_ICR;
203 shift = (15 - gpio) * 2;
204 } else {
205 reg = mpc8xxx_gc->regs + GPIO_ICR2;
206 shift = (15 - (gpio % 16)) * 2;
207 }
208
209 switch (flow_type) {
210 case IRQ_TYPE_EDGE_FALLING:
211 case IRQ_TYPE_LEVEL_LOW:
212 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
213 gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift))
214 | (2 << shift));
215 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
216 break;
217
218 case IRQ_TYPE_EDGE_RISING:
219 case IRQ_TYPE_LEVEL_HIGH:
220 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
221 gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift))
222 | (1 << shift));
223 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
224 break;
225
226 case IRQ_TYPE_EDGE_BOTH:
227 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
228 gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift)));
229 raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
230 break;
231
232 default:
233 return -EINVAL;
234 }
235
236 return 0;
237}
238
239static struct irq_chip mpc8xxx_irq_chip = {
240 .name = "mpc8xxx-gpio",
241 .irq_unmask = mpc8xxx_irq_unmask,
242 .irq_mask = mpc8xxx_irq_mask,
243 .irq_ack = mpc8xxx_irq_ack,
244 /* this might get overwritten in mpc8xxx_probe() */
245 .irq_set_type = mpc8xxx_irq_set_type,
246};
247
248static int mpc8xxx_gpio_irq_map(struct irq_domain *h, unsigned int irq,
249 irq_hw_number_t hwirq)
250{
251 irq_set_chip_data(irq, h->host_data);
252 irq_set_chip_and_handler(irq, &mpc8xxx_irq_chip, handle_edge_irq);
253
254 return 0;
255}
256
257static const struct irq_domain_ops mpc8xxx_gpio_irq_ops = {
258 .map = mpc8xxx_gpio_irq_map,
259 .xlate = irq_domain_xlate_twocell,
260};
261
262struct mpc8xxx_gpio_devtype {
263 int (*gpio_dir_out)(struct gpio_chip *, unsigned int, int);
264 int (*gpio_get)(struct gpio_chip *, unsigned int);
265 int (*irq_set_type)(struct irq_data *, unsigned int);
266};
267
268static const struct mpc8xxx_gpio_devtype mpc512x_gpio_devtype = {
269 .gpio_dir_out = mpc5121_gpio_dir_out,
270 .irq_set_type = mpc512x_irq_set_type,
271};
272
273static const struct mpc8xxx_gpio_devtype mpc5125_gpio_devtype = {
274 .gpio_dir_out = mpc5125_gpio_dir_out,
275 .irq_set_type = mpc512x_irq_set_type,
276};
277
278static const struct mpc8xxx_gpio_devtype mpc8572_gpio_devtype = {
279 .gpio_get = mpc8572_gpio_get,
280};
281
282static const struct mpc8xxx_gpio_devtype mpc8xxx_gpio_devtype_default = {
283 .irq_set_type = mpc8xxx_irq_set_type,
284};
285
286static const struct of_device_id mpc8xxx_gpio_ids[] = {
287 { .compatible = "fsl,mpc8349-gpio", },
288 { .compatible = "fsl,mpc8572-gpio", .data = &mpc8572_gpio_devtype, },
289 { .compatible = "fsl,mpc8610-gpio", },
290 { .compatible = "fsl,mpc5121-gpio", .data = &mpc512x_gpio_devtype, },
291 { .compatible = "fsl,mpc5125-gpio", .data = &mpc5125_gpio_devtype, },
292 { .compatible = "fsl,pq3-gpio", },
293 { .compatible = "fsl,ls1028a-gpio", },
294 { .compatible = "fsl,ls1088a-gpio", },
295 { .compatible = "fsl,qoriq-gpio", },
296 {}
297};
298
299static int mpc8xxx_probe(struct platform_device *pdev)
300{
301 struct device_node *np = pdev->dev.of_node;
302 struct mpc8xxx_gpio_chip *mpc8xxx_gc;
303 struct gpio_chip *gc;
304 const struct mpc8xxx_gpio_devtype *devtype = NULL;
305 struct fwnode_handle *fwnode;
306 int ret;
307
308 mpc8xxx_gc = devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc), GFP_KERNEL);
309 if (!mpc8xxx_gc)
310 return -ENOMEM;
311
312 platform_set_drvdata(pdev, mpc8xxx_gc);
313
314 raw_spin_lock_init(&mpc8xxx_gc->lock);
315
316 mpc8xxx_gc->regs = devm_platform_ioremap_resource(pdev, 0);
317 if (IS_ERR(mpc8xxx_gc->regs))
318 return PTR_ERR(mpc8xxx_gc->regs);
319
320 gc = &mpc8xxx_gc->gc;
321 gc->parent = &pdev->dev;
322
323 if (device_property_read_bool(&pdev->dev, "little-endian")) {
324 ret = bgpio_init(gc, &pdev->dev, 4,
325 mpc8xxx_gc->regs + GPIO_DAT,
326 NULL, NULL,
327 mpc8xxx_gc->regs + GPIO_DIR, NULL,
328 BGPIOF_BIG_ENDIAN);
329 if (ret)
330 return ret;
331 dev_dbg(&pdev->dev, "GPIO registers are LITTLE endian\n");
332 } else {
333 ret = bgpio_init(gc, &pdev->dev, 4,
334 mpc8xxx_gc->regs + GPIO_DAT,
335 NULL, NULL,
336 mpc8xxx_gc->regs + GPIO_DIR, NULL,
337 BGPIOF_BIG_ENDIAN
338 | BGPIOF_BIG_ENDIAN_BYTE_ORDER);
339 if (ret)
340 return ret;
341 dev_dbg(&pdev->dev, "GPIO registers are BIG endian\n");
342 }
343
344 mpc8xxx_gc->direction_output = gc->direction_output;
345
346 devtype = device_get_match_data(&pdev->dev);
347 if (!devtype)
348 devtype = &mpc8xxx_gpio_devtype_default;
349
350 /*
351 * It's assumed that only a single type of gpio controller is available
352 * on the current machine, so overwriting global data is fine.
353 */
354 if (devtype->irq_set_type)
355 mpc8xxx_irq_chip.irq_set_type = devtype->irq_set_type;
356
357 if (devtype->gpio_dir_out)
358 gc->direction_output = devtype->gpio_dir_out;
359 if (devtype->gpio_get)
360 gc->get = devtype->gpio_get;
361
362 gc->to_irq = mpc8xxx_gpio_to_irq;
363
364 /*
365 * The GPIO Input Buffer Enable register(GPIO_IBE) is used to control
366 * the input enable of each individual GPIO port. When an individual
367 * GPIO port’s direction is set to input (GPIO_GPDIR[DRn=0]), the
368 * associated input enable must be set (GPIOxGPIE[IEn]=1) to propagate
369 * the port value to the GPIO Data Register.
370 */
371 fwnode = dev_fwnode(&pdev->dev);
372 if (of_device_is_compatible(np, "fsl,qoriq-gpio") ||
373 of_device_is_compatible(np, "fsl,ls1028a-gpio") ||
374 of_device_is_compatible(np, "fsl,ls1088a-gpio") ||
375 is_acpi_node(fwnode)) {
376 gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
377 /* Also, latch state of GPIOs configured as output by bootloader. */
378 gc->bgpio_data = gc->read_reg(mpc8xxx_gc->regs + GPIO_DAT) &
379 gc->read_reg(mpc8xxx_gc->regs + GPIO_DIR);
380 }
381
382 ret = devm_gpiochip_add_data(&pdev->dev, gc, mpc8xxx_gc);
383 if (ret) {
384 dev_err(&pdev->dev,
385 "GPIO chip registration failed with status %d\n", ret);
386 return ret;
387 }
388
389 mpc8xxx_gc->irqn = platform_get_irq(pdev, 0);
390 if (mpc8xxx_gc->irqn < 0)
391 return mpc8xxx_gc->irqn;
392
393 mpc8xxx_gc->irq = irq_domain_create_linear(fwnode,
394 MPC8XXX_GPIO_PINS,
395 &mpc8xxx_gpio_irq_ops,
396 mpc8xxx_gc);
397
398 if (!mpc8xxx_gc->irq)
399 return 0;
400
401 /* ack and mask all irqs */
402 gc->write_reg(mpc8xxx_gc->regs + GPIO_IER, 0xffffffff);
403 gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR, 0);
404
405 ret = devm_request_irq(&pdev->dev, mpc8xxx_gc->irqn,
406 mpc8xxx_gpio_irq_cascade,
407 IRQF_NO_THREAD | IRQF_SHARED, "gpio-cascade",
408 mpc8xxx_gc);
409 if (ret) {
410 dev_err(&pdev->dev,
411 "failed to devm_request_irq(%d), ret = %d\n",
412 mpc8xxx_gc->irqn, ret);
413 goto err;
414 }
415
416 return 0;
417err:
418 irq_domain_remove(mpc8xxx_gc->irq);
419 return ret;
420}
421
422static void mpc8xxx_remove(struct platform_device *pdev)
423{
424 struct mpc8xxx_gpio_chip *mpc8xxx_gc = platform_get_drvdata(pdev);
425
426 if (mpc8xxx_gc->irq) {
427 irq_set_chained_handler_and_data(mpc8xxx_gc->irqn, NULL, NULL);
428 irq_domain_remove(mpc8xxx_gc->irq);
429 }
430}
431
432#ifdef CONFIG_ACPI
433static const struct acpi_device_id gpio_acpi_ids[] = {
434 {"NXP0031",},
435 { }
436};
437MODULE_DEVICE_TABLE(acpi, gpio_acpi_ids);
438#endif
439
440static struct platform_driver mpc8xxx_plat_driver = {
441 .probe = mpc8xxx_probe,
442 .remove_new = mpc8xxx_remove,
443 .driver = {
444 .name = "gpio-mpc8xxx",
445 .of_match_table = mpc8xxx_gpio_ids,
446 .acpi_match_table = ACPI_PTR(gpio_acpi_ids),
447 },
448};
449
450static int __init mpc8xxx_init(void)
451{
452 return platform_driver_register(&mpc8xxx_plat_driver);
453}
454
455arch_initcall(mpc8xxx_init);