1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/arm/mach-mmp/irq.c
4 *
5 * Generic IRQ handling, GPIO IRQ demultiplexing, etc.
6 * Copyright (C) 2008 - 2012 Marvell Technology Group Ltd.
7 *
8 * Author: Bin Yang <bin.yang@marvell.com>
9 * Haojian Zhuang <haojian.zhuang@gmail.com>
10 */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/irq.h>
15 #include <linux/irqchip.h>
16 #include <linux/irqchip/chained_irq.h>
17 #include <linux/irqdomain.h>
18 #include <linux/io.h>
19 #include <linux/ioport.h>
20 #include <linux/of_address.h>
21 #include <linux/of_irq.h>
22
23 #include <asm/exception.h>
24 #include <asm/hardirq.h>
25
26 #define MAX_ICU_NR 16
27
28 #define PJ1_INT_SEL 0x10c
29 #define PJ4_INT_SEL 0x104
30
31 /* bit fields in PJ1_INT_SEL and PJ4_INT_SEL */
32 #define SEL_INT_PENDING (1 << 6)
33 #define SEL_INT_NUM_MASK 0x3f
34
35 #define MMP2_ICU_INT_ROUTE_PJ4_IRQ (1 << 5)
36 #define MMP2_ICU_INT_ROUTE_PJ4_FIQ (1 << 6)
37
38 struct icu_chip_data {
39 int nr_irqs;
40 unsigned int virq_base;
41 unsigned int cascade_irq;
42 void __iomem *reg_status;
43 void __iomem *reg_mask;
44 unsigned int conf_enable;
45 unsigned int conf_disable;
46 unsigned int conf_mask;
47 unsigned int conf2_mask;
48 unsigned int clr_mfp_irq_base;
49 unsigned int clr_mfp_hwirq;
50 struct irq_domain *domain;
51 };
52
53 struct mmp_intc_conf {
54 unsigned int conf_enable;
55 unsigned int conf_disable;
56 unsigned int conf_mask;
57 unsigned int conf2_mask;
58 };
59
60 static void __iomem *mmp_icu_base;
61 static void __iomem *mmp_icu2_base;
62 static struct icu_chip_data icu_data[MAX_ICU_NR];
63 static int max_icu_nr;
64
65 extern void mmp2_clear_pmic_int(void);
66
icu_mask_ack_irq(struct irq_data * d)67 static void icu_mask_ack_irq(struct irq_data *d)
68 {
69 struct irq_domain *domain = d->domain;
70 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
71 int hwirq;
72 u32 r;
73
74 hwirq = d->irq - data->virq_base;
75 if (data == &icu_data[0]) {
76 r = readl_relaxed(mmp_icu_base + (hwirq << 2));
77 r &= ~data->conf_mask;
78 r |= data->conf_disable;
79 writel_relaxed(r, mmp_icu_base + (hwirq << 2));
80 } else {
81 #ifdef CONFIG_CPU_MMP2
82 if ((data->virq_base == data->clr_mfp_irq_base)
83 && (hwirq == data->clr_mfp_hwirq))
84 mmp2_clear_pmic_int();
85 #endif
86 r = readl_relaxed(data->reg_mask) | (1 << hwirq);
87 writel_relaxed(r, data->reg_mask);
88 }
89 }
90
icu_mask_irq(struct irq_data * d)91 static void icu_mask_irq(struct irq_data *d)
92 {
93 struct irq_domain *domain = d->domain;
94 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
95 int hwirq;
96 u32 r;
97
98 hwirq = d->irq - data->virq_base;
99 if (data == &icu_data[0]) {
100 r = readl_relaxed(mmp_icu_base + (hwirq << 2));
101 r &= ~data->conf_mask;
102 r |= data->conf_disable;
103 writel_relaxed(r, mmp_icu_base + (hwirq << 2));
104
105 if (data->conf2_mask) {
106 /*
107 * ICU1 (above) only controls PJ4 MP1; if using SMP,
108 * we need to also mask the MP2 and MM cores via ICU2.
109 */
110 r = readl_relaxed(mmp_icu2_base + (hwirq << 2));
111 r &= ~data->conf2_mask;
112 writel_relaxed(r, mmp_icu2_base + (hwirq << 2));
113 }
114 } else {
115 r = readl_relaxed(data->reg_mask) | (1 << hwirq);
116 writel_relaxed(r, data->reg_mask);
117 }
118 }
119
icu_unmask_irq(struct irq_data * d)120 static void icu_unmask_irq(struct irq_data *d)
121 {
122 struct irq_domain *domain = d->domain;
123 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
124 int hwirq;
125 u32 r;
126
127 hwirq = d->irq - data->virq_base;
128 if (data == &icu_data[0]) {
129 r = readl_relaxed(mmp_icu_base + (hwirq << 2));
130 r &= ~data->conf_mask;
131 r |= data->conf_enable;
132 writel_relaxed(r, mmp_icu_base + (hwirq << 2));
133 } else {
134 r = readl_relaxed(data->reg_mask) & ~(1 << hwirq);
135 writel_relaxed(r, data->reg_mask);
136 }
137 }
138
139 struct irq_chip icu_irq_chip = {
140 .name = "icu_irq",
141 .irq_mask = icu_mask_irq,
142 .irq_mask_ack = icu_mask_ack_irq,
143 .irq_unmask = icu_unmask_irq,
144 };
145
icu_mux_irq_demux(struct irq_desc * desc)146 static void icu_mux_irq_demux(struct irq_desc *desc)
147 {
148 unsigned int irq = irq_desc_get_irq(desc);
149 struct irq_chip *chip = irq_desc_get_chip(desc);
150 struct irq_domain *domain;
151 struct icu_chip_data *data;
152 int i;
153 unsigned long mask, status, n;
154
155 chained_irq_enter(chip, desc);
156
157 for (i = 1; i < max_icu_nr; i++) {
158 if (irq == icu_data[i].cascade_irq) {
159 domain = icu_data[i].domain;
160 data = (struct icu_chip_data *)domain->host_data;
161 break;
162 }
163 }
164 if (i >= max_icu_nr) {
165 pr_err("Spurious irq %d in MMP INTC\n", irq);
166 goto out;
167 }
168
169 mask = readl_relaxed(data->reg_mask);
170 while (1) {
171 status = readl_relaxed(data->reg_status) & ~mask;
172 if (status == 0)
173 break;
174 for_each_set_bit(n, &status, BITS_PER_LONG) {
175 generic_handle_irq(icu_data[i].virq_base + n);
176 }
177 }
178
179 out:
180 chained_irq_exit(chip, desc);
181 }
182
mmp_irq_domain_map(struct irq_domain * d,unsigned int irq,irq_hw_number_t hw)183 static int mmp_irq_domain_map(struct irq_domain *d, unsigned int irq,
184 irq_hw_number_t hw)
185 {
186 irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
187 return 0;
188 }
189
mmp_irq_domain_xlate(struct irq_domain * d,struct device_node * node,const u32 * intspec,unsigned int intsize,unsigned long * out_hwirq,unsigned int * out_type)190 static int mmp_irq_domain_xlate(struct irq_domain *d, struct device_node *node,
191 const u32 *intspec, unsigned int intsize,
192 unsigned long *out_hwirq,
193 unsigned int *out_type)
194 {
195 *out_hwirq = intspec[0];
196 return 0;
197 }
198
199 static const struct irq_domain_ops mmp_irq_domain_ops = {
200 .map = mmp_irq_domain_map,
201 .xlate = mmp_irq_domain_xlate,
202 };
203
204 static const struct mmp_intc_conf mmp_conf = {
205 .conf_enable = 0x51,
206 .conf_disable = 0x0,
207 .conf_mask = 0x7f,
208 };
209
210 static const struct mmp_intc_conf mmp2_conf = {
211 .conf_enable = 0x20,
212 .conf_disable = 0x0,
213 .conf_mask = MMP2_ICU_INT_ROUTE_PJ4_IRQ |
214 MMP2_ICU_INT_ROUTE_PJ4_FIQ,
215 };
216
217 static struct mmp_intc_conf mmp3_conf = {
218 .conf_enable = 0x20,
219 .conf_disable = 0x0,
220 .conf_mask = MMP2_ICU_INT_ROUTE_PJ4_IRQ |
221 MMP2_ICU_INT_ROUTE_PJ4_FIQ,
222 .conf2_mask = 0xf0,
223 };
224
mmp_handle_irq(struct pt_regs * regs)225 static void __exception_irq_entry mmp_handle_irq(struct pt_regs *regs)
226 {
227 int hwirq;
228
229 hwirq = readl_relaxed(mmp_icu_base + PJ1_INT_SEL);
230 if (!(hwirq & SEL_INT_PENDING))
231 return;
232 hwirq &= SEL_INT_NUM_MASK;
233 generic_handle_domain_irq(icu_data[0].domain, hwirq);
234 }
235
mmp2_handle_irq(struct pt_regs * regs)236 static void __exception_irq_entry mmp2_handle_irq(struct pt_regs *regs)
237 {
238 int hwirq;
239
240 hwirq = readl_relaxed(mmp_icu_base + PJ4_INT_SEL);
241 if (!(hwirq & SEL_INT_PENDING))
242 return;
243 hwirq &= SEL_INT_NUM_MASK;
244 generic_handle_domain_irq(icu_data[0].domain, hwirq);
245 }
246
mmp_init_bases(struct device_node * node)247 static int __init mmp_init_bases(struct device_node *node)
248 {
249 int ret, nr_irqs, irq, i = 0;
250
251 ret = of_property_read_u32(node, "mrvl,intc-nr-irqs", &nr_irqs);
252 if (ret) {
253 pr_err("Not found mrvl,intc-nr-irqs property\n");
254 return ret;
255 }
256
257 mmp_icu_base = of_iomap(node, 0);
258 if (!mmp_icu_base) {
259 pr_err("Failed to get interrupt controller register\n");
260 return -ENOMEM;
261 }
262
263 icu_data[0].virq_base = 0;
264 icu_data[0].domain = irq_domain_add_linear(node, nr_irqs,
265 &mmp_irq_domain_ops,
266 &icu_data[0]);
267 for (irq = 0; irq < nr_irqs; irq++) {
268 ret = irq_create_mapping(icu_data[0].domain, irq);
269 if (!ret) {
270 pr_err("Failed to mapping hwirq\n");
271 goto err;
272 }
273 if (!irq)
274 icu_data[0].virq_base = ret;
275 }
276 icu_data[0].nr_irqs = nr_irqs;
277 return 0;
278 err:
279 if (icu_data[0].virq_base) {
280 for (i = 0; i < irq; i++)
281 irq_dispose_mapping(icu_data[0].virq_base + i);
282 }
283 irq_domain_remove(icu_data[0].domain);
284 iounmap(mmp_icu_base);
285 return -EINVAL;
286 }
287
mmp_of_init(struct device_node * node,struct device_node * parent)288 static int __init mmp_of_init(struct device_node *node,
289 struct device_node *parent)
290 {
291 int ret;
292
293 ret = mmp_init_bases(node);
294 if (ret < 0)
295 return ret;
296
297 icu_data[0].conf_enable = mmp_conf.conf_enable;
298 icu_data[0].conf_disable = mmp_conf.conf_disable;
299 icu_data[0].conf_mask = mmp_conf.conf_mask;
300 set_handle_irq(mmp_handle_irq);
301 max_icu_nr = 1;
302 return 0;
303 }
304 IRQCHIP_DECLARE(mmp_intc, "mrvl,mmp-intc", mmp_of_init);
305
mmp2_of_init(struct device_node * node,struct device_node * parent)306 static int __init mmp2_of_init(struct device_node *node,
307 struct device_node *parent)
308 {
309 int ret;
310
311 ret = mmp_init_bases(node);
312 if (ret < 0)
313 return ret;
314
315 icu_data[0].conf_enable = mmp2_conf.conf_enable;
316 icu_data[0].conf_disable = mmp2_conf.conf_disable;
317 icu_data[0].conf_mask = mmp2_conf.conf_mask;
318 set_handle_irq(mmp2_handle_irq);
319 max_icu_nr = 1;
320 return 0;
321 }
322 IRQCHIP_DECLARE(mmp2_intc, "mrvl,mmp2-intc", mmp2_of_init);
323
mmp3_of_init(struct device_node * node,struct device_node * parent)324 static int __init mmp3_of_init(struct device_node *node,
325 struct device_node *parent)
326 {
327 int ret;
328
329 mmp_icu2_base = of_iomap(node, 1);
330 if (!mmp_icu2_base) {
331 pr_err("Failed to get interrupt controller register #2\n");
332 return -ENODEV;
333 }
334
335 ret = mmp_init_bases(node);
336 if (ret < 0) {
337 iounmap(mmp_icu2_base);
338 return ret;
339 }
340
341 icu_data[0].conf_enable = mmp3_conf.conf_enable;
342 icu_data[0].conf_disable = mmp3_conf.conf_disable;
343 icu_data[0].conf_mask = mmp3_conf.conf_mask;
344 icu_data[0].conf2_mask = mmp3_conf.conf2_mask;
345
346 if (!parent) {
347 /* This is the main interrupt controller. */
348 set_handle_irq(mmp2_handle_irq);
349 }
350
351 max_icu_nr = 1;
352 return 0;
353 }
354 IRQCHIP_DECLARE(mmp3_intc, "marvell,mmp3-intc", mmp3_of_init);
355
mmp2_mux_of_init(struct device_node * node,struct device_node * parent)356 static int __init mmp2_mux_of_init(struct device_node *node,
357 struct device_node *parent)
358 {
359 int i, ret, irq, j = 0;
360 u32 nr_irqs, mfp_irq;
361 u32 reg[4];
362
363 if (!parent)
364 return -ENODEV;
365
366 i = max_icu_nr;
367 ret = of_property_read_u32(node, "mrvl,intc-nr-irqs",
368 &nr_irqs);
369 if (ret) {
370 pr_err("Not found mrvl,intc-nr-irqs property\n");
371 return -EINVAL;
372 }
373
374 /*
375 * For historical reasons, the "regs" property of the
376 * mrvl,mmp2-mux-intc is not a regular "regs" property containing
377 * addresses on the parent bus, but offsets from the intc's base.
378 * That is why we can't use of_address_to_resource() here.
379 */
380 ret = of_property_read_variable_u32_array(node, "reg", reg,
381 ARRAY_SIZE(reg),
382 ARRAY_SIZE(reg));
383 if (ret < 0) {
384 pr_err("Not found reg property\n");
385 return -EINVAL;
386 }
387 icu_data[i].reg_status = mmp_icu_base + reg[0];
388 icu_data[i].reg_mask = mmp_icu_base + reg[2];
389 icu_data[i].cascade_irq = irq_of_parse_and_map(node, 0);
390 if (!icu_data[i].cascade_irq)
391 return -EINVAL;
392
393 icu_data[i].virq_base = 0;
394 icu_data[i].domain = irq_domain_add_linear(node, nr_irqs,
395 &mmp_irq_domain_ops,
396 &icu_data[i]);
397 for (irq = 0; irq < nr_irqs; irq++) {
398 ret = irq_create_mapping(icu_data[i].domain, irq);
399 if (!ret) {
400 pr_err("Failed to mapping hwirq\n");
401 goto err;
402 }
403 if (!irq)
404 icu_data[i].virq_base = ret;
405 }
406 icu_data[i].nr_irqs = nr_irqs;
407 if (!of_property_read_u32(node, "mrvl,clr-mfp-irq",
408 &mfp_irq)) {
409 icu_data[i].clr_mfp_irq_base = icu_data[i].virq_base;
410 icu_data[i].clr_mfp_hwirq = mfp_irq;
411 }
412 irq_set_chained_handler(icu_data[i].cascade_irq,
413 icu_mux_irq_demux);
414 max_icu_nr++;
415 return 0;
416 err:
417 if (icu_data[i].virq_base) {
418 for (j = 0; j < irq; j++)
419 irq_dispose_mapping(icu_data[i].virq_base + j);
420 }
421 irq_domain_remove(icu_data[i].domain);
422 return -EINVAL;
423 }
424 IRQCHIP_DECLARE(mmp2_mux_intc, "mrvl,mmp2-mux-intc", mmp2_mux_of_init);
425