Commit | Line | Data |
---|---|---|
1dbae815 | 1 | /* |
f30c2269 | 2 | * linux/arch/arm/mach-omap2/irq.c |
1dbae815 TL |
3 | * |
4 | * Interrupt handler for OMAP2 boards. | |
5 | * | |
6 | * Copyright (C) 2005 Nokia Corporation | |
7 | * Author: Paul Mundt <paul.mundt@nokia.com> | |
8 | * | |
9 | * This file is subject to the terms and conditions of the GNU General Public | |
10 | * License. See the file "COPYING" in the main directory of this archive | |
11 | * for more details. | |
12 | */ | |
13 | #include <linux/kernel.h> | |
52fa2120 | 14 | #include <linux/module.h> |
1dbae815 | 15 | #include <linux/init.h> |
1dbae815 | 16 | #include <linux/interrupt.h> |
2e7509e5 | 17 | #include <linux/io.h> |
ee0839c2 | 18 | |
2db14997 | 19 | #include <asm/exception.h> |
1dbae815 | 20 | #include <asm/mach/irq.h> |
52fa2120 BC |
21 | #include <linux/irqdomain.h> |
22 | #include <linux/of.h> | |
23 | #include <linux/of_address.h> | |
1dbae815 | 24 | |
ee0839c2 TL |
25 | #include <mach/hardware.h> |
26 | ||
27 | #include "iomap.h" | |
e2ed89fc | 28 | #include "common.h" |
2e7509e5 PW |
29 | |
30 | /* selected INTC register offsets */ | |
31 | ||
32 | #define INTC_REVISION 0x0000 | |
33 | #define INTC_SYSCONFIG 0x0010 | |
34 | #define INTC_SYSSTATUS 0x0014 | |
6ccc4c0d | 35 | #define INTC_SIR 0x0040 |
2e7509e5 | 36 | #define INTC_CONTROL 0x0048 |
0addd61b RN |
37 | #define INTC_PROTECTION 0x004C |
38 | #define INTC_IDLE 0x0050 | |
39 | #define INTC_THRESHOLD 0x0068 | |
40 | #define INTC_MIR0 0x0084 | |
2e7509e5 PW |
41 | #define INTC_MIR_CLEAR0 0x0088 |
42 | #define INTC_MIR_SET0 0x008c | |
43 | #define INTC_PENDING_IRQ0 0x0098 | |
2e7509e5 PW |
44 | /* Number of IRQ state bits in each MIR register */ |
45 | #define IRQ_BITS_PER_REG 32 | |
1dbae815 | 46 | |
2db14997 MZ |
47 | #define OMAP2_IRQ_BASE OMAP2_L4_IO_ADDRESS(OMAP24XX_IC_BASE) |
48 | #define OMAP3_IRQ_BASE OMAP2_L4_IO_ADDRESS(OMAP34XX_IC_BASE) | |
49 | #define INTCPS_SIR_IRQ_OFFSET 0x0040 /* omap2/3 active interrupt offset */ | |
50 | #define ACTIVEIRQ_MASK 0x7f /* omap2/3 active interrupt bits */ | |
51 | ||
1dbae815 TL |
52 | /* |
53 | * OMAP2 has a number of different interrupt controllers, each interrupt | |
54 | * controller is identified as its own "bank". Register definitions are | |
55 | * fairly consistent for each bank, but not all registers are implemented | |
56 | * for each bank.. when in doubt, consult the TRM. | |
57 | */ | |
58 | static struct omap_irq_bank { | |
e8a91c95 | 59 | void __iomem *base_reg; |
1dbae815 TL |
60 | unsigned int nr_irqs; |
61 | } __attribute__ ((aligned(4))) irq_banks[] = { | |
62 | { | |
63 | /* MPU INTC */ | |
1dbae815 | 64 | .nr_irqs = 96, |
646e3ed1 | 65 | }, |
1dbae815 TL |
66 | }; |
67 | ||
52fa2120 BC |
68 | static struct irq_domain *domain; |
69 | ||
0addd61b RN |
70 | /* Structure to save interrupt controller context */ |
71 | struct omap3_intc_regs { | |
72 | u32 sysconfig; | |
73 | u32 protection; | |
74 | u32 idle; | |
75 | u32 threshold; | |
76 | u32 ilr[INTCPS_NR_IRQS]; | |
77 | u32 mir[INTCPS_NR_MIR_REGS]; | |
78 | }; | |
79 | ||
2e7509e5 PW |
80 | /* INTC bank register get/set */ |
81 | ||
82 | static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg) | |
83 | { | |
84 | __raw_writel(val, bank->base_reg + reg); | |
85 | } | |
86 | ||
87 | static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg) | |
88 | { | |
89 | return __raw_readl(bank->base_reg + reg); | |
90 | } | |
91 | ||
1dbae815 | 92 | /* XXX: FIQ and additional INTC support (only MPU at the moment) */ |
df303477 | 93 | static void omap_ack_irq(struct irq_data *d) |
1dbae815 | 94 | { |
2e7509e5 | 95 | intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL); |
1dbae815 TL |
96 | } |
97 | ||
df303477 | 98 | static void omap_mask_ack_irq(struct irq_data *d) |
1dbae815 | 99 | { |
667a11fa | 100 | irq_gc_mask_disable_reg(d); |
df303477 | 101 | omap_ack_irq(d); |
1dbae815 TL |
102 | } |
103 | ||
1dbae815 TL |
104 | static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank) |
105 | { | |
106 | unsigned long tmp; | |
107 | ||
2e7509e5 | 108 | tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff; |
e8a91c95 | 109 | printk(KERN_INFO "IRQ: Found an INTC at 0x%p " |
1dbae815 TL |
110 | "(revision %ld.%ld) with %d interrupts\n", |
111 | bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs); | |
112 | ||
2e7509e5 | 113 | tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG); |
1dbae815 | 114 | tmp |= 1 << 1; /* soft reset */ |
2e7509e5 | 115 | intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG); |
1dbae815 | 116 | |
2e7509e5 | 117 | while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1)) |
1dbae815 | 118 | /* Wait for reset to complete */; |
375e12ab JY |
119 | |
120 | /* Enable autoidle */ | |
2e7509e5 | 121 | intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG); |
1dbae815 TL |
122 | } |
123 | ||
94434535 JH |
124 | int omap_irq_pending(void) |
125 | { | |
126 | int i; | |
127 | ||
128 | for (i = 0; i < ARRAY_SIZE(irq_banks); i++) { | |
129 | struct omap_irq_bank *bank = irq_banks + i; | |
130 | int irq; | |
131 | ||
132 | for (irq = 0; irq < bank->nr_irqs; irq += 32) | |
133 | if (intc_bank_read_reg(bank, INTC_PENDING_IRQ0 + | |
134 | ((irq >> 5) << 5))) | |
135 | return 1; | |
136 | } | |
137 | return 0; | |
138 | } | |
139 | ||
667a11fa TL |
140 | static __init void |
141 | omap_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num) | |
142 | { | |
143 | struct irq_chip_generic *gc; | |
144 | struct irq_chip_type *ct; | |
145 | ||
146 | gc = irq_alloc_generic_chip("INTC", 1, irq_start, base, | |
147 | handle_level_irq); | |
148 | ct = gc->chip_types; | |
149 | ct->chip.irq_ack = omap_mask_ack_irq; | |
150 | ct->chip.irq_mask = irq_gc_mask_disable_reg; | |
151 | ct->chip.irq_unmask = irq_gc_unmask_enable_reg; | |
152 | ||
667a11fa TL |
153 | ct->regs.enable = INTC_MIR_CLEAR0; |
154 | ct->regs.disable = INTC_MIR_SET0; | |
155 | irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, | |
156 | IRQ_NOREQUEST | IRQ_NOPROBE, 0); | |
157 | } | |
158 | ||
52fa2120 BC |
159 | static void __init omap_init_irq(u32 base, int nr_irqs, |
160 | struct device_node *node) | |
1dbae815 | 161 | { |
ab65be26 | 162 | void __iomem *omap_irq_base; |
4b1135a2 | 163 | unsigned long nr_of_irqs = 0; |
1dbae815 | 164 | unsigned int nr_banks = 0; |
52fa2120 | 165 | int i, j, irq_base; |
1dbae815 | 166 | |
741e3a89 TL |
167 | omap_irq_base = ioremap(base, SZ_4K); |
168 | if (WARN_ON(!omap_irq_base)) | |
169 | return; | |
170 | ||
52fa2120 BC |
171 | irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0); |
172 | if (irq_base < 0) { | |
173 | pr_warn("Couldn't allocate IRQ numbers\n"); | |
174 | irq_base = 0; | |
175 | } | |
176 | ||
177 | domain = irq_domain_add_legacy(node, nr_irqs, irq_base, 0, | |
178 | &irq_domain_simple_ops, NULL); | |
179 | ||
1dbae815 TL |
180 | for (i = 0; i < ARRAY_SIZE(irq_banks); i++) { |
181 | struct omap_irq_bank *bank = irq_banks + i; | |
182 | ||
741e3a89 | 183 | bank->nr_irqs = nr_irqs; |
01001712 | 184 | |
1b26fe86 TL |
185 | /* Static mapping, never released */ |
186 | bank->base_reg = ioremap(base, SZ_4K); | |
187 | if (!bank->base_reg) { | |
52fa2120 | 188 | pr_err("Could not ioremap irq bank%i\n", i); |
1b26fe86 TL |
189 | continue; |
190 | } | |
2e7509e5 | 191 | |
1dbae815 TL |
192 | omap_irq_bank_init_one(bank); |
193 | ||
5c30cdfa | 194 | for (j = 0; j < bank->nr_irqs; j += 32) |
52fa2120 | 195 | omap_alloc_gc(bank->base_reg + j, j + irq_base, 32); |
667a11fa | 196 | |
4b1135a2 | 197 | nr_of_irqs += bank->nr_irqs; |
1dbae815 TL |
198 | nr_banks++; |
199 | } | |
200 | ||
52fa2120 BC |
201 | pr_info("Total of %ld interrupts on %d active controller%s\n", |
202 | nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : ""); | |
1dbae815 TL |
203 | } |
204 | ||
741e3a89 TL |
205 | void __init omap2_init_irq(void) |
206 | { | |
52fa2120 | 207 | omap_init_irq(OMAP24XX_IC_BASE, 96, NULL); |
741e3a89 TL |
208 | } |
209 | ||
210 | void __init omap3_init_irq(void) | |
211 | { | |
52fa2120 | 212 | omap_init_irq(OMAP34XX_IC_BASE, 96, NULL); |
741e3a89 TL |
213 | } |
214 | ||
a920360f | 215 | void __init ti81xx_init_irq(void) |
741e3a89 | 216 | { |
52fa2120 | 217 | omap_init_irq(OMAP34XX_IC_BASE, 128, NULL); |
741e3a89 TL |
218 | } |
219 | ||
2db14997 MZ |
220 | static inline void omap_intc_handle_irq(void __iomem *base_addr, struct pt_regs *regs) |
221 | { | |
222 | u32 irqnr; | |
223 | ||
224 | do { | |
225 | irqnr = readl_relaxed(base_addr + 0x98); | |
226 | if (irqnr) | |
227 | goto out; | |
228 | ||
229 | irqnr = readl_relaxed(base_addr + 0xb8); | |
230 | if (irqnr) | |
231 | goto out; | |
232 | ||
233 | irqnr = readl_relaxed(base_addr + 0xd8); | |
33959553 | 234 | #ifdef CONFIG_SOC_TI81XX |
2db14997 MZ |
235 | if (irqnr) |
236 | goto out; | |
237 | irqnr = readl_relaxed(base_addr + 0xf8); | |
238 | #endif | |
239 | ||
240 | out: | |
241 | if (!irqnr) | |
242 | break; | |
243 | ||
244 | irqnr = readl_relaxed(base_addr + INTCPS_SIR_IRQ_OFFSET); | |
245 | irqnr &= ACTIVEIRQ_MASK; | |
246 | ||
52fa2120 BC |
247 | if (irqnr) { |
248 | irqnr = irq_find_mapping(domain, irqnr); | |
2db14997 | 249 | handle_IRQ(irqnr, regs); |
52fa2120 | 250 | } |
2db14997 MZ |
251 | } while (irqnr); |
252 | } | |
253 | ||
254 | asmlinkage void __exception_irq_entry omap2_intc_handle_irq(struct pt_regs *regs) | |
255 | { | |
256 | void __iomem *base_addr = OMAP2_IRQ_BASE; | |
257 | omap_intc_handle_irq(base_addr, regs); | |
258 | } | |
259 | ||
52fa2120 BC |
260 | int __init omap_intc_of_init(struct device_node *node, |
261 | struct device_node *parent) | |
262 | { | |
263 | struct resource res; | |
264 | u32 nr_irqs = 96; | |
265 | ||
266 | if (WARN_ON(!node)) | |
267 | return -ENODEV; | |
268 | ||
269 | if (of_address_to_resource(node, 0, &res)) { | |
270 | WARN(1, "unable to get intc registers\n"); | |
271 | return -EINVAL; | |
272 | } | |
273 | ||
274 | if (of_property_read_u32(node, "ti,intc-size", &nr_irqs)) | |
275 | pr_warn("unable to get intc-size, default to %d\n", nr_irqs); | |
276 | ||
277 | omap_init_irq(res.start, nr_irqs, of_node_get(node)); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
0addd61b | 282 | #ifdef CONFIG_ARCH_OMAP3 |
ee23b93d FB |
283 | static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)]; |
284 | ||
0addd61b RN |
285 | void omap_intc_save_context(void) |
286 | { | |
287 | int ind = 0, i = 0; | |
288 | for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) { | |
289 | struct omap_irq_bank *bank = irq_banks + ind; | |
290 | intc_context[ind].sysconfig = | |
291 | intc_bank_read_reg(bank, INTC_SYSCONFIG); | |
292 | intc_context[ind].protection = | |
293 | intc_bank_read_reg(bank, INTC_PROTECTION); | |
294 | intc_context[ind].idle = | |
295 | intc_bank_read_reg(bank, INTC_IDLE); | |
296 | intc_context[ind].threshold = | |
297 | intc_bank_read_reg(bank, INTC_THRESHOLD); | |
298 | for (i = 0; i < INTCPS_NR_IRQS; i++) | |
299 | intc_context[ind].ilr[i] = | |
2329e7cc | 300 | intc_bank_read_reg(bank, (0x100 + 0x4*i)); |
0addd61b RN |
301 | for (i = 0; i < INTCPS_NR_MIR_REGS; i++) |
302 | intc_context[ind].mir[i] = | |
303 | intc_bank_read_reg(&irq_banks[0], INTC_MIR0 + | |
304 | (0x20 * i)); | |
305 | } | |
306 | } | |
307 | ||
308 | void omap_intc_restore_context(void) | |
309 | { | |
310 | int ind = 0, i = 0; | |
311 | ||
312 | for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) { | |
313 | struct omap_irq_bank *bank = irq_banks + ind; | |
314 | intc_bank_write_reg(intc_context[ind].sysconfig, | |
315 | bank, INTC_SYSCONFIG); | |
316 | intc_bank_write_reg(intc_context[ind].sysconfig, | |
317 | bank, INTC_SYSCONFIG); | |
318 | intc_bank_write_reg(intc_context[ind].protection, | |
319 | bank, INTC_PROTECTION); | |
320 | intc_bank_write_reg(intc_context[ind].idle, | |
321 | bank, INTC_IDLE); | |
322 | intc_bank_write_reg(intc_context[ind].threshold, | |
323 | bank, INTC_THRESHOLD); | |
324 | for (i = 0; i < INTCPS_NR_IRQS; i++) | |
325 | intc_bank_write_reg(intc_context[ind].ilr[i], | |
2329e7cc | 326 | bank, (0x100 + 0x4*i)); |
0addd61b RN |
327 | for (i = 0; i < INTCPS_NR_MIR_REGS; i++) |
328 | intc_bank_write_reg(intc_context[ind].mir[i], | |
329 | &irq_banks[0], INTC_MIR0 + (0x20 * i)); | |
330 | } | |
331 | /* MIRs are saved and restore with other PRCM registers */ | |
332 | } | |
2bbe3af3 TK |
333 | |
334 | void omap3_intc_suspend(void) | |
335 | { | |
336 | /* A pending interrupt would prevent OMAP from entering suspend */ | |
a7022d60 | 337 | omap_ack_irq(NULL); |
2bbe3af3 | 338 | } |
f18cc2ff TK |
339 | |
340 | void omap3_intc_prepare_idle(void) | |
341 | { | |
447b8da5 JP |
342 | /* |
343 | * Disable autoidle as it can stall interrupt controller, | |
344 | * cf. errata ID i540 for 3430 (all revisions up to 3.1.x) | |
345 | */ | |
f18cc2ff TK |
346 | intc_bank_write_reg(0, &irq_banks[0], INTC_SYSCONFIG); |
347 | } | |
348 | ||
349 | void omap3_intc_resume_idle(void) | |
350 | { | |
351 | /* Re-enable autoidle */ | |
352 | intc_bank_write_reg(1, &irq_banks[0], INTC_SYSCONFIG); | |
353 | } | |
2db14997 MZ |
354 | |
355 | asmlinkage void __exception_irq_entry omap3_intc_handle_irq(struct pt_regs *regs) | |
356 | { | |
357 | void __iomem *base_addr = OMAP3_IRQ_BASE; | |
358 | omap_intc_handle_irq(base_addr, regs); | |
359 | } | |
0addd61b | 360 | #endif /* CONFIG_ARCH_OMAP3 */ |