Commit | Line | Data |
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171bb2f1 JC |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify it | |
3 | * under the terms of the GNU General Public License version 2 as published | |
4 | * by the Free Software Foundation. | |
5 | * | |
6 | * Copyright (C) 2010 John Crispin <blogic@openwrt.org> | |
7 | * Copyright (C) 2010 Thomas Langer <thomas.langer@lantiq.com> | |
8 | */ | |
9 | ||
10 | #include <linux/interrupt.h> | |
11 | #include <linux/ioport.h> | |
3645da02 JC |
12 | #include <linux/sched.h> |
13 | #include <linux/irqdomain.h> | |
14 | #include <linux/of_platform.h> | |
15 | #include <linux/of_address.h> | |
16 | #include <linux/of_irq.h> | |
171bb2f1 JC |
17 | |
18 | #include <asm/bootinfo.h> | |
19 | #include <asm/irq_cpu.h> | |
20 | ||
21 | #include <lantiq_soc.h> | |
22 | #include <irq.h> | |
23 | ||
3645da02 | 24 | /* register definitions - internal irqs */ |
171bb2f1 JC |
25 | #define LTQ_ICU_IM0_ISR 0x0000 |
26 | #define LTQ_ICU_IM0_IER 0x0008 | |
27 | #define LTQ_ICU_IM0_IOSR 0x0010 | |
28 | #define LTQ_ICU_IM0_IRSR 0x0018 | |
29 | #define LTQ_ICU_IM0_IMR 0x0020 | |
30 | #define LTQ_ICU_IM1_ISR 0x0028 | |
31 | #define LTQ_ICU_OFFSET (LTQ_ICU_IM1_ISR - LTQ_ICU_IM0_ISR) | |
32 | ||
3645da02 | 33 | /* register definitions - external irqs */ |
171bb2f1 JC |
34 | #define LTQ_EIU_EXIN_C 0x0000 |
35 | #define LTQ_EIU_EXIN_INIC 0x0004 | |
36 | #define LTQ_EIU_EXIN_INEN 0x000C | |
37 | ||
38 | /* irq numbers used by the external interrupt unit (EIU) */ | |
39 | #define LTQ_EIU_IR0 (INT_NUM_IM4_IRL0 + 30) | |
40 | #define LTQ_EIU_IR1 (INT_NUM_IM3_IRL0 + 31) | |
41 | #define LTQ_EIU_IR2 (INT_NUM_IM1_IRL0 + 26) | |
42 | #define LTQ_EIU_IR3 INT_NUM_IM1_IRL0 | |
43 | #define LTQ_EIU_IR4 (INT_NUM_IM1_IRL0 + 1) | |
44 | #define LTQ_EIU_IR5 (INT_NUM_IM1_IRL0 + 2) | |
45 | #define LTQ_EIU_IR6 (INT_NUM_IM2_IRL0 + 30) | |
3645da02 | 46 | #define XWAY_EXIN_COUNT 3 |
171bb2f1 JC |
47 | #define MAX_EIU 6 |
48 | ||
59c11579 JC |
49 | /* the performance counter */ |
50 | #define LTQ_PERF_IRQ (INT_NUM_IM4_IRL0 + 31) | |
51 | ||
3645da02 JC |
52 | /* |
53 | * irqs generated by devices attached to the EBU need to be acked in | |
171bb2f1 JC |
54 | * a special manner |
55 | */ | |
56 | #define LTQ_ICU_EBU_IRQ 22 | |
57 | ||
58 | #define ltq_icu_w32(x, y) ltq_w32((x), ltq_icu_membase + (y)) | |
59 | #define ltq_icu_r32(x) ltq_r32(ltq_icu_membase + (x)) | |
60 | ||
61 | #define ltq_eiu_w32(x, y) ltq_w32((x), ltq_eiu_membase + (y)) | |
62 | #define ltq_eiu_r32(x) ltq_r32(ltq_eiu_membase + (x)) | |
63 | ||
a8d096ef JC |
64 | /* our 2 ipi interrupts for VSMP */ |
65 | #define MIPS_CPU_IPI_RESCHED_IRQ 0 | |
66 | #define MIPS_CPU_IPI_CALL_IRQ 1 | |
67 | ||
3645da02 JC |
68 | /* we have a cascade of 8 irqs */ |
69 | #define MIPS_CPU_IRQ_CASCADE 8 | |
70 | ||
a8d096ef JC |
71 | #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC) |
72 | int gic_present; | |
73 | #endif | |
74 | ||
171bb2f1 JC |
75 | static unsigned short ltq_eiu_irq[MAX_EIU] = { |
76 | LTQ_EIU_IR0, | |
77 | LTQ_EIU_IR1, | |
78 | LTQ_EIU_IR2, | |
79 | LTQ_EIU_IR3, | |
80 | LTQ_EIU_IR4, | |
81 | LTQ_EIU_IR5, | |
82 | }; | |
83 | ||
3645da02 | 84 | static int exin_avail; |
171bb2f1 JC |
85 | static void __iomem *ltq_icu_membase; |
86 | static void __iomem *ltq_eiu_membase; | |
87 | ||
88 | void ltq_disable_irq(struct irq_data *d) | |
89 | { | |
90 | u32 ier = LTQ_ICU_IM0_IER; | |
3645da02 | 91 | int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE; |
171bb2f1 | 92 | |
3645da02 JC |
93 | ier += LTQ_ICU_OFFSET * (offset / INT_NUM_IM_OFFSET); |
94 | offset %= INT_NUM_IM_OFFSET; | |
95 | ltq_icu_w32(ltq_icu_r32(ier) & ~BIT(offset), ier); | |
171bb2f1 JC |
96 | } |
97 | ||
98 | void ltq_mask_and_ack_irq(struct irq_data *d) | |
99 | { | |
100 | u32 ier = LTQ_ICU_IM0_IER; | |
101 | u32 isr = LTQ_ICU_IM0_ISR; | |
3645da02 | 102 | int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE; |
171bb2f1 | 103 | |
3645da02 JC |
104 | ier += LTQ_ICU_OFFSET * (offset / INT_NUM_IM_OFFSET); |
105 | isr += LTQ_ICU_OFFSET * (offset / INT_NUM_IM_OFFSET); | |
106 | offset %= INT_NUM_IM_OFFSET; | |
107 | ltq_icu_w32(ltq_icu_r32(ier) & ~BIT(offset), ier); | |
108 | ltq_icu_w32(BIT(offset), isr); | |
171bb2f1 JC |
109 | } |
110 | ||
111 | static void ltq_ack_irq(struct irq_data *d) | |
112 | { | |
113 | u32 isr = LTQ_ICU_IM0_ISR; | |
3645da02 | 114 | int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE; |
171bb2f1 | 115 | |
3645da02 JC |
116 | isr += LTQ_ICU_OFFSET * (offset / INT_NUM_IM_OFFSET); |
117 | offset %= INT_NUM_IM_OFFSET; | |
118 | ltq_icu_w32(BIT(offset), isr); | |
171bb2f1 JC |
119 | } |
120 | ||
121 | void ltq_enable_irq(struct irq_data *d) | |
122 | { | |
123 | u32 ier = LTQ_ICU_IM0_IER; | |
3645da02 | 124 | int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE; |
171bb2f1 | 125 | |
3645da02 JC |
126 | ier += LTQ_ICU_OFFSET * (offset / INT_NUM_IM_OFFSET); |
127 | offset %= INT_NUM_IM_OFFSET; | |
128 | ltq_icu_w32(ltq_icu_r32(ier) | BIT(offset), ier); | |
171bb2f1 JC |
129 | } |
130 | ||
131 | static unsigned int ltq_startup_eiu_irq(struct irq_data *d) | |
132 | { | |
133 | int i; | |
171bb2f1 JC |
134 | |
135 | ltq_enable_irq(d); | |
136 | for (i = 0; i < MAX_EIU; i++) { | |
3645da02 | 137 | if (d->hwirq == ltq_eiu_irq[i]) { |
171bb2f1 JC |
138 | /* low level - we should really handle set_type */ |
139 | ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_C) | | |
140 | (0x6 << (i * 4)), LTQ_EIU_EXIN_C); | |
141 | /* clear all pending */ | |
3645da02 | 142 | ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INIC) & ~BIT(i), |
171bb2f1 JC |
143 | LTQ_EIU_EXIN_INIC); |
144 | /* enable */ | |
3645da02 | 145 | ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) | BIT(i), |
171bb2f1 JC |
146 | LTQ_EIU_EXIN_INEN); |
147 | break; | |
148 | } | |
149 | } | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static void ltq_shutdown_eiu_irq(struct irq_data *d) | |
155 | { | |
156 | int i; | |
171bb2f1 JC |
157 | |
158 | ltq_disable_irq(d); | |
159 | for (i = 0; i < MAX_EIU; i++) { | |
3645da02 | 160 | if (d->hwirq == ltq_eiu_irq[i]) { |
171bb2f1 | 161 | /* disable */ |
3645da02 | 162 | ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) & ~BIT(i), |
171bb2f1 JC |
163 | LTQ_EIU_EXIN_INEN); |
164 | break; | |
165 | } | |
166 | } | |
167 | } | |
168 | ||
169 | static struct irq_chip ltq_irq_type = { | |
170 | "icu", | |
171 | .irq_enable = ltq_enable_irq, | |
172 | .irq_disable = ltq_disable_irq, | |
173 | .irq_unmask = ltq_enable_irq, | |
174 | .irq_ack = ltq_ack_irq, | |
175 | .irq_mask = ltq_disable_irq, | |
176 | .irq_mask_ack = ltq_mask_and_ack_irq, | |
177 | }; | |
178 | ||
179 | static struct irq_chip ltq_eiu_type = { | |
180 | "eiu", | |
181 | .irq_startup = ltq_startup_eiu_irq, | |
182 | .irq_shutdown = ltq_shutdown_eiu_irq, | |
183 | .irq_enable = ltq_enable_irq, | |
184 | .irq_disable = ltq_disable_irq, | |
185 | .irq_unmask = ltq_enable_irq, | |
186 | .irq_ack = ltq_ack_irq, | |
187 | .irq_mask = ltq_disable_irq, | |
188 | .irq_mask_ack = ltq_mask_and_ack_irq, | |
189 | }; | |
190 | ||
191 | static void ltq_hw_irqdispatch(int module) | |
192 | { | |
193 | u32 irq; | |
194 | ||
195 | irq = ltq_icu_r32(LTQ_ICU_IM0_IOSR + (module * LTQ_ICU_OFFSET)); | |
196 | if (irq == 0) | |
197 | return; | |
198 | ||
3645da02 JC |
199 | /* |
200 | * silicon bug causes only the msb set to 1 to be valid. all | |
171bb2f1 JC |
201 | * other bits might be bogus |
202 | */ | |
203 | irq = __fls(irq); | |
3645da02 | 204 | do_IRQ((int)irq + MIPS_CPU_IRQ_CASCADE + (INT_NUM_IM_OFFSET * module)); |
171bb2f1 JC |
205 | |
206 | /* if this is a EBU irq, we need to ack it or get a deadlock */ | |
3645da02 | 207 | if ((irq == LTQ_ICU_EBU_IRQ) && (module == 0) && LTQ_EBU_PCC_ISTAT) |
171bb2f1 JC |
208 | ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_ISTAT) | 0x10, |
209 | LTQ_EBU_PCC_ISTAT); | |
210 | } | |
211 | ||
212 | #define DEFINE_HWx_IRQDISPATCH(x) \ | |
213 | static void ltq_hw ## x ## _irqdispatch(void) \ | |
214 | { \ | |
215 | ltq_hw_irqdispatch(x); \ | |
216 | } | |
217 | DEFINE_HWx_IRQDISPATCH(0) | |
218 | DEFINE_HWx_IRQDISPATCH(1) | |
219 | DEFINE_HWx_IRQDISPATCH(2) | |
220 | DEFINE_HWx_IRQDISPATCH(3) | |
221 | DEFINE_HWx_IRQDISPATCH(4) | |
222 | ||
223 | static void ltq_hw5_irqdispatch(void) | |
224 | { | |
225 | do_IRQ(MIPS_CPU_TIMER_IRQ); | |
226 | } | |
227 | ||
a8d096ef JC |
228 | #ifdef CONFIG_MIPS_MT_SMP |
229 | void __init arch_init_ipiirq(int irq, struct irqaction *action) | |
230 | { | |
231 | setup_irq(irq, action); | |
232 | irq_set_handler(irq, handle_percpu_irq); | |
233 | } | |
234 | ||
235 | static void ltq_sw0_irqdispatch(void) | |
236 | { | |
237 | do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ); | |
238 | } | |
239 | ||
240 | static void ltq_sw1_irqdispatch(void) | |
241 | { | |
242 | do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ); | |
243 | } | |
244 | static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id) | |
245 | { | |
246 | scheduler_ipi(); | |
247 | return IRQ_HANDLED; | |
248 | } | |
249 | ||
250 | static irqreturn_t ipi_call_interrupt(int irq, void *dev_id) | |
251 | { | |
252 | smp_call_function_interrupt(); | |
253 | return IRQ_HANDLED; | |
254 | } | |
255 | ||
256 | static struct irqaction irq_resched = { | |
257 | .handler = ipi_resched_interrupt, | |
258 | .flags = IRQF_PERCPU, | |
259 | .name = "IPI_resched" | |
260 | }; | |
261 | ||
262 | static struct irqaction irq_call = { | |
263 | .handler = ipi_call_interrupt, | |
264 | .flags = IRQF_PERCPU, | |
265 | .name = "IPI_call" | |
266 | }; | |
267 | #endif | |
268 | ||
171bb2f1 JC |
269 | asmlinkage void plat_irq_dispatch(void) |
270 | { | |
271 | unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; | |
272 | unsigned int i; | |
273 | ||
274 | if (pending & CAUSEF_IP7) { | |
275 | do_IRQ(MIPS_CPU_TIMER_IRQ); | |
276 | goto out; | |
277 | } else { | |
278 | for (i = 0; i < 5; i++) { | |
279 | if (pending & (CAUSEF_IP2 << i)) { | |
280 | ltq_hw_irqdispatch(i); | |
281 | goto out; | |
282 | } | |
283 | } | |
284 | } | |
285 | pr_alert("Spurious IRQ: CAUSE=0x%08x\n", read_c0_status()); | |
286 | ||
287 | out: | |
288 | return; | |
289 | } | |
290 | ||
3645da02 JC |
291 | static int icu_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) |
292 | { | |
293 | struct irq_chip *chip = <q_irq_type; | |
294 | int i; | |
295 | ||
296 | for (i = 0; i < exin_avail; i++) | |
297 | if (hw == ltq_eiu_irq[i]) | |
298 | chip = <q_eiu_type; | |
299 | ||
300 | irq_set_chip_and_handler(hw, chip, handle_level_irq); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static const struct irq_domain_ops irq_domain_ops = { | |
306 | .xlate = irq_domain_xlate_onetwocell, | |
307 | .map = icu_map, | |
308 | }; | |
309 | ||
171bb2f1 JC |
310 | static struct irqaction cascade = { |
311 | .handler = no_action, | |
171bb2f1 JC |
312 | .name = "cascade", |
313 | }; | |
314 | ||
3645da02 | 315 | int __init icu_of_init(struct device_node *node, struct device_node *parent) |
171bb2f1 | 316 | { |
3645da02 JC |
317 | struct device_node *eiu_node; |
318 | struct resource res; | |
171bb2f1 JC |
319 | int i; |
320 | ||
3645da02 JC |
321 | if (of_address_to_resource(node, 0, &res)) |
322 | panic("Failed to get icu memory range"); | |
171bb2f1 | 323 | |
3645da02 JC |
324 | if (request_mem_region(res.start, resource_size(&res), res.name) < 0) |
325 | pr_err("Failed to request icu memory"); | |
171bb2f1 | 326 | |
3645da02 | 327 | ltq_icu_membase = ioremap_nocache(res.start, resource_size(&res)); |
171bb2f1 | 328 | if (!ltq_icu_membase) |
ab75dc02 | 329 | panic("Failed to remap icu memory"); |
171bb2f1 | 330 | |
3645da02 JC |
331 | /* the external interrupts are optional and xway only */ |
332 | eiu_node = of_find_compatible_node(NULL, NULL, "lantiq,eiu"); | |
333 | if (eiu_node && of_address_to_resource(eiu_node, 0, &res)) { | |
334 | /* find out how many external irq sources we have */ | |
335 | const __be32 *count = of_get_property(node, | |
336 | "lantiq,count", NULL); | |
337 | ||
338 | if (count) | |
339 | exin_avail = *count; | |
340 | if (exin_avail > MAX_EIU) | |
341 | exin_avail = MAX_EIU; | |
342 | ||
343 | if (request_mem_region(res.start, resource_size(&res), | |
344 | res.name) < 0) | |
345 | pr_err("Failed to request eiu memory"); | |
346 | ||
347 | ltq_eiu_membase = ioremap_nocache(res.start, | |
348 | resource_size(&res)); | |
349 | if (!ltq_eiu_membase) | |
350 | panic("Failed to remap eiu memory"); | |
351 | } | |
171bb2f1 | 352 | |
16f70b56 JC |
353 | /* turn off all irqs by default */ |
354 | for (i = 0; i < 5; i++) { | |
355 | /* make sure all irqs are turned off by default */ | |
171bb2f1 | 356 | ltq_icu_w32(0, LTQ_ICU_IM0_IER + (i * LTQ_ICU_OFFSET)); |
16f70b56 JC |
357 | /* clear all possibly pending interrupts */ |
358 | ltq_icu_w32(~0, LTQ_ICU_IM0_ISR + (i * LTQ_ICU_OFFSET)); | |
359 | } | |
171bb2f1 JC |
360 | |
361 | mips_cpu_irq_init(); | |
362 | ||
363 | for (i = 2; i <= 6; i++) | |
364 | setup_irq(i, &cascade); | |
365 | ||
366 | if (cpu_has_vint) { | |
367 | pr_info("Setting up vectored interrupts\n"); | |
368 | set_vi_handler(2, ltq_hw0_irqdispatch); | |
369 | set_vi_handler(3, ltq_hw1_irqdispatch); | |
370 | set_vi_handler(4, ltq_hw2_irqdispatch); | |
371 | set_vi_handler(5, ltq_hw3_irqdispatch); | |
372 | set_vi_handler(6, ltq_hw4_irqdispatch); | |
373 | set_vi_handler(7, ltq_hw5_irqdispatch); | |
374 | } | |
375 | ||
3645da02 JC |
376 | irq_domain_add_linear(node, 6 * INT_NUM_IM_OFFSET, |
377 | &irq_domain_ops, 0); | |
171bb2f1 | 378 | |
a8d096ef JC |
379 | #if defined(CONFIG_MIPS_MT_SMP) |
380 | if (cpu_has_vint) { | |
381 | pr_info("Setting up IPI vectored interrupts\n"); | |
382 | set_vi_handler(MIPS_CPU_IPI_RESCHED_IRQ, ltq_sw0_irqdispatch); | |
383 | set_vi_handler(MIPS_CPU_IPI_CALL_IRQ, ltq_sw1_irqdispatch); | |
384 | } | |
385 | arch_init_ipiirq(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ, | |
386 | &irq_resched); | |
387 | arch_init_ipiirq(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ, &irq_call); | |
388 | #endif | |
389 | ||
171bb2f1 JC |
390 | #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC) |
391 | set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | | |
392 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); | |
393 | #else | |
394 | set_c0_status(IE_SW0 | IE_SW1 | IE_IRQ0 | IE_IRQ1 | | |
395 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); | |
396 | #endif | |
59c11579 JC |
397 | |
398 | /* tell oprofile which irq to use */ | |
399 | cp0_perfcount_irq = LTQ_PERF_IRQ; | |
3645da02 | 400 | return 0; |
171bb2f1 JC |
401 | } |
402 | ||
403 | unsigned int __cpuinit get_c0_compare_int(void) | |
404 | { | |
405 | return CP0_LEGACY_COMPARE_IRQ; | |
406 | } | |
3645da02 JC |
407 | |
408 | static struct of_device_id __initdata of_irq_ids[] = { | |
409 | { .compatible = "lantiq,icu", .data = icu_of_init }, | |
410 | {}, | |
411 | }; | |
412 | ||
413 | void __init arch_init_irq(void) | |
414 | { | |
415 | of_irq_init(of_irq_ids); | |
416 | } |