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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / irqchip / qcom-pdc.c
blob6ae9e1f0819da1615f80fbfb6eda00c348b9c256
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
4 */
5
6 #include <linux/err.h>
7 #include <linux/init.h>
8 #include <linux/interrupt.h>
9 #include <linux/irq.h>
10 #include <linux/irqchip.h>
11 #include <linux/irqdomain.h>
12 #include <linux/io.h>
13 #include <linux/kernel.h>
14 #include <linux/of.h>
15 #include <linux/of_address.h>
16 #include <linux/of_device.h>
17 #include <linux/soc/qcom/irq.h>
18 #include <linux/spinlock.h>
19 #include <linux/slab.h>
20 #include <linux/types.h>
21
22 #define PDC_MAX_IRQS 168
23 #define PDC_MAX_GPIO_IRQS 256
24
25 #define CLEAR_INTR(reg, intr) (reg & ~(1 << intr))
26 #define ENABLE_INTR(reg, intr) (reg | (1 << intr))
27
28 #define IRQ_ENABLE_BANK 0x10
29 #define IRQ_i_CFG 0x110
30
31 #define PDC_NO_PARENT_IRQ ~0UL
32
33 struct pdc_pin_region {
34 u32 pin_base;
35 u32 parent_base;
36 u32 cnt;
37 };
38
39 static DEFINE_RAW_SPINLOCK(pdc_lock);
40 static void __iomem *pdc_base;
41 static struct pdc_pin_region *pdc_region;
42 static int pdc_region_cnt;
43
44 static void pdc_reg_write(int reg, u32 i, u32 val)
45 {
46 writel_relaxed(val, pdc_base + reg + i * sizeof(u32));
47 }
48
49 static u32 pdc_reg_read(int reg, u32 i)
50 {
51 return readl_relaxed(pdc_base + reg + i * sizeof(u32));
52 }
53
54 static int qcom_pdc_gic_get_irqchip_state(struct irq_data *d,
55 enum irqchip_irq_state which,
56 bool *state)
57 {
58 if (d->hwirq == GPIO_NO_WAKE_IRQ)
59 return 0;
60
61 return irq_chip_get_parent_state(d, which, state);
62 }
63
64 static int qcom_pdc_gic_set_irqchip_state(struct irq_data *d,
65 enum irqchip_irq_state which,
66 bool value)
67 {
68 if (d->hwirq == GPIO_NO_WAKE_IRQ)
69 return 0;
70
71 return irq_chip_set_parent_state(d, which, value);
72 }
73
74 static void pdc_enable_intr(struct irq_data *d, bool on)
75 {
76 int pin_out = d->hwirq;
77 u32 index, mask;
78 u32 enable;
79
80 index = pin_out / 32;
81 mask = pin_out % 32;
82
83 raw_spin_lock(&pdc_lock);
84 enable = pdc_reg_read(IRQ_ENABLE_BANK, index);
85 enable = on ? ENABLE_INTR(enable, mask) : CLEAR_INTR(enable, mask);
86 pdc_reg_write(IRQ_ENABLE_BANK, index, enable);
87 raw_spin_unlock(&pdc_lock);
88 }
89
90 static void qcom_pdc_gic_disable(struct irq_data *d)
91 {
92 if (d->hwirq == GPIO_NO_WAKE_IRQ)
93 return;
94
95 pdc_enable_intr(d, false);
96 irq_chip_disable_parent(d);
97 }
98
99 static void qcom_pdc_gic_enable(struct irq_data *d)
100 {
101 if (d->hwirq == GPIO_NO_WAKE_IRQ)
102 return;
103
104 pdc_enable_intr(d, true);
105 irq_chip_enable_parent(d);
106 }
107
108 static void qcom_pdc_gic_mask(struct irq_data *d)
109 {
110 if (d->hwirq == GPIO_NO_WAKE_IRQ)
111 return;
112
113 irq_chip_mask_parent(d);
114 }
115
116 static void qcom_pdc_gic_unmask(struct irq_data *d)
117 {
118 if (d->hwirq == GPIO_NO_WAKE_IRQ)
119 return;
120
121 irq_chip_unmask_parent(d);
122 }
123
124 /*
125 * GIC does not handle falling edge or active low. To allow falling edge and
126 * active low interrupts to be handled at GIC, PDC has an inverter that inverts
127 * falling edge into a rising edge and active low into an active high.
128 * For the inverter to work, the polarity bit in the IRQ_CONFIG register has to
129 * set as per the table below.
130 * Level sensitive active low LOW
131 * Rising edge sensitive NOT USED
132 * Falling edge sensitive LOW
133 * Dual Edge sensitive NOT USED
134 * Level sensitive active High HIGH
135 * Falling Edge sensitive NOT USED
136 * Rising edge sensitive HIGH
137 * Dual Edge sensitive HIGH
138 */
139 enum pdc_irq_config_bits {
140 PDC_LEVEL_LOW = 0b000,
141 PDC_EDGE_FALLING = 0b010,
142 PDC_LEVEL_HIGH = 0b100,
143 PDC_EDGE_RISING = 0b110,
144 PDC_EDGE_DUAL = 0b111,
145 };
146
147 /**
148 * qcom_pdc_gic_set_type: Configure PDC for the interrupt
149 *
150 * @d: the interrupt data
151 * @type: the interrupt type
152 *
153 * If @type is edge triggered, forward that as Rising edge as PDC
154 * takes care of converting falling edge to rising edge signal
155 * If @type is level, then forward that as level high as PDC
156 * takes care of converting falling edge to rising edge signal
157 */
158 static int qcom_pdc_gic_set_type(struct irq_data *d, unsigned int type)
159 {
160 int pin_out = d->hwirq;
161 enum pdc_irq_config_bits pdc_type;
162
163 if (pin_out == GPIO_NO_WAKE_IRQ)
164 return 0;
165
166 switch (type) {
167 case IRQ_TYPE_EDGE_RISING:
168 pdc_type = PDC_EDGE_RISING;
169 break;
170 case IRQ_TYPE_EDGE_FALLING:
171 pdc_type = PDC_EDGE_FALLING;
172 type = IRQ_TYPE_EDGE_RISING;
173 break;
174 case IRQ_TYPE_EDGE_BOTH:
175 pdc_type = PDC_EDGE_DUAL;
176 type = IRQ_TYPE_EDGE_RISING;
177 break;
178 case IRQ_TYPE_LEVEL_HIGH:
179 pdc_type = PDC_LEVEL_HIGH;
180 break;
181 case IRQ_TYPE_LEVEL_LOW:
182 pdc_type = PDC_LEVEL_LOW;
183 type = IRQ_TYPE_LEVEL_HIGH;
184 break;
185 default:
186 WARN_ON(1);
187 return -EINVAL;
188 }
189
190 pdc_reg_write(IRQ_i_CFG, pin_out, pdc_type);
191
192 return irq_chip_set_type_parent(d, type);
193 }
194
195 static struct irq_chip qcom_pdc_gic_chip = {
196 .name = "PDC",
197 .irq_eoi = irq_chip_eoi_parent,
198 .irq_mask = qcom_pdc_gic_mask,
199 .irq_unmask = qcom_pdc_gic_unmask,
200 .irq_disable = qcom_pdc_gic_disable,
201 .irq_enable = qcom_pdc_gic_enable,
202 .irq_get_irqchip_state = qcom_pdc_gic_get_irqchip_state,
203 .irq_set_irqchip_state = qcom_pdc_gic_set_irqchip_state,
204 .irq_retrigger = irq_chip_retrigger_hierarchy,
205 .irq_set_type = qcom_pdc_gic_set_type,
206 .flags = IRQCHIP_MASK_ON_SUSPEND |
207 IRQCHIP_SET_TYPE_MASKED |
208 IRQCHIP_SKIP_SET_WAKE,
209 .irq_set_vcpu_affinity = irq_chip_set_vcpu_affinity_parent,
210 .irq_set_affinity = irq_chip_set_affinity_parent,
211 };
212
213 static irq_hw_number_t get_parent_hwirq(int pin)
214 {
215 int i;
216 struct pdc_pin_region *region;
217
218 for (i = 0; i < pdc_region_cnt; i++) {
219 region = &pdc_region[i];
220 if (pin >= region->pin_base &&
221 pin < region->pin_base + region->cnt)
222 return (region->parent_base + pin - region->pin_base);
223 }
224
225 return PDC_NO_PARENT_IRQ;
226 }
227
228 static int qcom_pdc_translate(struct irq_domain *d, struct irq_fwspec *fwspec,
229 unsigned long *hwirq, unsigned int *type)
230 {
231 if (is_of_node(fwspec->fwnode)) {
232 if (fwspec->param_count != 2)
233 return -EINVAL;
234
235 *hwirq = fwspec->param[0];
236 *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
237 return 0;
238 }
239
240 return -EINVAL;
241 }
242
243 static int qcom_pdc_alloc(struct irq_domain *domain, unsigned int virq,
244 unsigned int nr_irqs, void *data)
245 {
246 struct irq_fwspec *fwspec = data;
247 struct irq_fwspec parent_fwspec;
248 irq_hw_number_t hwirq, parent_hwirq;
249 unsigned int type;
250 int ret;
251
252 ret = qcom_pdc_translate(domain, fwspec, &hwirq, &type);
253 if (ret)
254 return ret;
255
256 ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
257 &qcom_pdc_gic_chip, NULL);
258 if (ret)
259 return ret;
260
261 parent_hwirq = get_parent_hwirq(hwirq);
262 if (parent_hwirq == PDC_NO_PARENT_IRQ)
263 return 0;
264
265 if (type & IRQ_TYPE_EDGE_BOTH)
266 type = IRQ_TYPE_EDGE_RISING;
267
268 if (type & IRQ_TYPE_LEVEL_MASK)
269 type = IRQ_TYPE_LEVEL_HIGH;
270
271 parent_fwspec.fwnode = domain->parent->fwnode;
272 parent_fwspec.param_count = 3;
273 parent_fwspec.param[0] = 0;
274 parent_fwspec.param[1] = parent_hwirq;
275 parent_fwspec.param[2] = type;
276
277 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
278 &parent_fwspec);
279 }
280
281 static const struct irq_domain_ops qcom_pdc_ops = {
282 .translate = qcom_pdc_translate,
283 .alloc = qcom_pdc_alloc,
284 .free = irq_domain_free_irqs_common,
285 };
286
287 static int qcom_pdc_gpio_alloc(struct irq_domain *domain, unsigned int virq,
288 unsigned int nr_irqs, void *data)
289 {
290 struct irq_fwspec *fwspec = data;
291 struct irq_fwspec parent_fwspec;
292 irq_hw_number_t hwirq, parent_hwirq;
293 unsigned int type;
294 int ret;
295
296 ret = qcom_pdc_translate(domain, fwspec, &hwirq, &type);
297 if (ret)
298 return ret;
299
300 ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
301 &qcom_pdc_gic_chip, NULL);
302 if (ret)
303 return ret;
304
305 if (hwirq == GPIO_NO_WAKE_IRQ)
306 return 0;
307
308 parent_hwirq = get_parent_hwirq(hwirq);
309 if (parent_hwirq == PDC_NO_PARENT_IRQ)
310 return 0;
311
312 if (type & IRQ_TYPE_EDGE_BOTH)
313 type = IRQ_TYPE_EDGE_RISING;
314
315 if (type & IRQ_TYPE_LEVEL_MASK)
316 type = IRQ_TYPE_LEVEL_HIGH;
317
318 parent_fwspec.fwnode = domain->parent->fwnode;
319 parent_fwspec.param_count = 3;
320 parent_fwspec.param[0] = 0;
321 parent_fwspec.param[1] = parent_hwirq;
322 parent_fwspec.param[2] = type;
323
324 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
325 &parent_fwspec);
326 }
327
328 static int qcom_pdc_gpio_domain_select(struct irq_domain *d,
329 struct irq_fwspec *fwspec,
330 enum irq_domain_bus_token bus_token)
331 {
332 return bus_token == DOMAIN_BUS_WAKEUP;
333 }
334
335 static const struct irq_domain_ops qcom_pdc_gpio_ops = {
336 .select = qcom_pdc_gpio_domain_select,
337 .alloc = qcom_pdc_gpio_alloc,
338 .free = irq_domain_free_irqs_common,
339 };
340
341 static int pdc_setup_pin_mapping(struct device_node *np)
342 {
343 int ret, n;
344
345 n = of_property_count_elems_of_size(np, "qcom,pdc-ranges", sizeof(u32));
346 if (n <= 0 || n % 3)
347 return -EINVAL;
348
349 pdc_region_cnt = n / 3;
350 pdc_region = kcalloc(pdc_region_cnt, sizeof(*pdc_region), GFP_KERNEL);
351 if (!pdc_region) {
352 pdc_region_cnt = 0;
353 return -ENOMEM;
354 }
355
356 for (n = 0; n < pdc_region_cnt; n++) {
357 ret = of_property_read_u32_index(np, "qcom,pdc-ranges",
358 n * 3 + 0,
359 &pdc_region[n].pin_base);
360 if (ret)
361 return ret;
362 ret = of_property_read_u32_index(np, "qcom,pdc-ranges",
363 n * 3 + 1,
364 &pdc_region[n].parent_base);
365 if (ret)
366 return ret;
367 ret = of_property_read_u32_index(np, "qcom,pdc-ranges",
368 n * 3 + 2,
369 &pdc_region[n].cnt);
370 if (ret)
371 return ret;
372 }
373
374 return 0;
375 }
376
377 static int qcom_pdc_init(struct device_node *node, struct device_node *parent)
378 {
379 struct irq_domain *parent_domain, *pdc_domain, *pdc_gpio_domain;
380 int ret;
381
382 pdc_base = of_iomap(node, 0);
383 if (!pdc_base) {
384 pr_err("%pOF: unable to map PDC registers\n", node);
385 return -ENXIO;
386 }
387
388 parent_domain = irq_find_host(parent);
389 if (!parent_domain) {
390 pr_err("%pOF: unable to find PDC's parent domain\n", node);
391 ret = -ENXIO;
392 goto fail;
393 }
394
395 ret = pdc_setup_pin_mapping(node);
396 if (ret) {
397 pr_err("%pOF: failed to init PDC pin-hwirq mapping\n", node);
398 goto fail;
399 }
400
401 pdc_domain = irq_domain_create_hierarchy(parent_domain, 0, PDC_MAX_IRQS,
402 of_fwnode_handle(node),
403 &qcom_pdc_ops, NULL);
404 if (!pdc_domain) {
405 pr_err("%pOF: GIC domain add failed\n", node);
406 ret = -ENOMEM;
407 goto fail;
408 }
409
410 pdc_gpio_domain = irq_domain_create_hierarchy(parent_domain,
411 IRQ_DOMAIN_FLAG_QCOM_PDC_WAKEUP,
412 PDC_MAX_GPIO_IRQS,
413 of_fwnode_handle(node),
414 &qcom_pdc_gpio_ops, NULL);
415 if (!pdc_gpio_domain) {
416 pr_err("%pOF: PDC domain add failed for GPIO domain\n", node);
417 ret = -ENOMEM;
418 goto remove;
419 }
420
421 irq_domain_update_bus_token(pdc_gpio_domain, DOMAIN_BUS_WAKEUP);
422
423 return 0;
424
425 remove:
426 irq_domain_remove(pdc_domain);
427 fail:
428 kfree(pdc_region);
429 iounmap(pdc_base);
430 return ret;
431 }
432
433 IRQCHIP_DECLARE(qcom_pdc, "qcom,pdc", qcom_pdc_init);
Linux with added FPC-III support