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> |
41a83e06 | 20 | #include <linux/irqchip.h> |
52fa2120 BC |
21 | #include <linux/irqdomain.h> |
22 | #include <linux/of.h> | |
23 | #include <linux/of_address.h> | |
c4082d49 | 24 | #include <linux/of_irq.h> |
1dbae815 | 25 | |
f3142635 BD |
26 | #include <linux/irqchip/irq-omap-intc.h> |
27 | ||
2e7509e5 PW |
28 | /* selected INTC register offsets */ |
29 | ||
30 | #define INTC_REVISION 0x0000 | |
31 | #define INTC_SYSCONFIG 0x0010 | |
32 | #define INTC_SYSSTATUS 0x0014 | |
6ccc4c0d | 33 | #define INTC_SIR 0x0040 |
2e7509e5 | 34 | #define INTC_CONTROL 0x0048 |
0addd61b RN |
35 | #define INTC_PROTECTION 0x004C |
36 | #define INTC_IDLE 0x0050 | |
37 | #define INTC_THRESHOLD 0x0068 | |
38 | #define INTC_MIR0 0x0084 | |
2e7509e5 PW |
39 | #define INTC_MIR_CLEAR0 0x0088 |
40 | #define INTC_MIR_SET0 0x008c | |
41 | #define INTC_PENDING_IRQ0 0x0098 | |
11983656 FB |
42 | #define INTC_PENDING_IRQ1 0x00b8 |
43 | #define INTC_PENDING_IRQ2 0x00d8 | |
44 | #define INTC_PENDING_IRQ3 0x00f8 | |
33c7c7b7 | 45 | #define INTC_ILR0 0x0100 |
1dbae815 | 46 | |
2db14997 | 47 | #define ACTIVEIRQ_MASK 0x7f /* omap2/3 active interrupt bits */ |
d3b421cd | 48 | #define SPURIOUSIRQ_MASK (0x1ffffff << 7) |
a88ab430 | 49 | #define INTCPS_NR_ILR_REGS 128 |
74b6c8ef | 50 | #define INTCPS_NR_MIR_REGS 4 |
2db14997 | 51 | |
b3079149 FB |
52 | #define INTC_IDLE_FUNCIDLE (1 << 0) |
53 | #define INTC_IDLE_TURBO (1 << 1) | |
54 | ||
9836ee9f FB |
55 | #define INTC_PROTECTION_ENABLE (1 << 0) |
56 | ||
272a8b04 | 57 | struct omap_intc_regs { |
0addd61b RN |
58 | u32 sysconfig; |
59 | u32 protection; | |
60 | u32 idle; | |
61 | u32 threshold; | |
a88ab430 | 62 | u32 ilr[INTCPS_NR_ILR_REGS]; |
0addd61b RN |
63 | u32 mir[INTCPS_NR_MIR_REGS]; |
64 | }; | |
131b48c0 FB |
65 | static struct omap_intc_regs intc_context; |
66 | ||
67 | static struct irq_domain *domain; | |
68 | static void __iomem *omap_irq_base; | |
77c858fa LM |
69 | static int omap_nr_pending; |
70 | static int omap_nr_irqs; | |
0addd61b | 71 | |
71be00c9 | 72 | static void intc_writel(u32 reg, u32 val) |
2e7509e5 | 73 | { |
71be00c9 | 74 | writel_relaxed(val, omap_irq_base + reg); |
2e7509e5 PW |
75 | } |
76 | ||
71be00c9 | 77 | static u32 intc_readl(u32 reg) |
2e7509e5 | 78 | { |
71be00c9 | 79 | return readl_relaxed(omap_irq_base + reg); |
2e7509e5 PW |
80 | } |
81 | ||
131b48c0 FB |
82 | void omap_intc_save_context(void) |
83 | { | |
84 | int i; | |
85 | ||
86 | intc_context.sysconfig = | |
87 | intc_readl(INTC_SYSCONFIG); | |
88 | intc_context.protection = | |
89 | intc_readl(INTC_PROTECTION); | |
90 | intc_context.idle = | |
91 | intc_readl(INTC_IDLE); | |
92 | intc_context.threshold = | |
93 | intc_readl(INTC_THRESHOLD); | |
94 | ||
95 | for (i = 0; i < omap_nr_irqs; i++) | |
96 | intc_context.ilr[i] = | |
97 | intc_readl((INTC_ILR0 + 0x4 * i)); | |
98 | for (i = 0; i < INTCPS_NR_MIR_REGS; i++) | |
99 | intc_context.mir[i] = | |
100 | intc_readl(INTC_MIR0 + (0x20 * i)); | |
101 | } | |
102 | ||
103 | void omap_intc_restore_context(void) | |
104 | { | |
105 | int i; | |
106 | ||
107 | intc_writel(INTC_SYSCONFIG, intc_context.sysconfig); | |
108 | intc_writel(INTC_PROTECTION, intc_context.protection); | |
109 | intc_writel(INTC_IDLE, intc_context.idle); | |
110 | intc_writel(INTC_THRESHOLD, intc_context.threshold); | |
111 | ||
112 | for (i = 0; i < omap_nr_irqs; i++) | |
113 | intc_writel(INTC_ILR0 + 0x4 * i, | |
114 | intc_context.ilr[i]); | |
115 | ||
116 | for (i = 0; i < INTCPS_NR_MIR_REGS; i++) | |
117 | intc_writel(INTC_MIR0 + 0x20 * i, | |
118 | intc_context.mir[i]); | |
119 | /* MIRs are saved and restore with other PRCM registers */ | |
120 | } | |
121 | ||
122 | void omap3_intc_prepare_idle(void) | |
123 | { | |
124 | /* | |
125 | * Disable autoidle as it can stall interrupt controller, | |
126 | * cf. errata ID i540 for 3430 (all revisions up to 3.1.x) | |
127 | */ | |
128 | intc_writel(INTC_SYSCONFIG, 0); | |
b3079149 | 129 | intc_writel(INTC_IDLE, INTC_IDLE_TURBO); |
131b48c0 FB |
130 | } |
131 | ||
132 | void omap3_intc_resume_idle(void) | |
133 | { | |
134 | /* Re-enable autoidle */ | |
135 | intc_writel(INTC_SYSCONFIG, 1); | |
b3079149 | 136 | intc_writel(INTC_IDLE, 0); |
131b48c0 FB |
137 | } |
138 | ||
1dbae815 | 139 | /* XXX: FIQ and additional INTC support (only MPU at the moment) */ |
df303477 | 140 | static void omap_ack_irq(struct irq_data *d) |
1dbae815 | 141 | { |
71be00c9 | 142 | intc_writel(INTC_CONTROL, 0x1); |
1dbae815 TL |
143 | } |
144 | ||
df303477 | 145 | static void omap_mask_ack_irq(struct irq_data *d) |
1dbae815 | 146 | { |
667a11fa | 147 | irq_gc_mask_disable_reg(d); |
df303477 | 148 | omap_ack_irq(d); |
1dbae815 TL |
149 | } |
150 | ||
a88ab430 | 151 | static void __init omap_irq_soft_reset(void) |
1dbae815 TL |
152 | { |
153 | unsigned long tmp; | |
154 | ||
71be00c9 | 155 | tmp = intc_readl(INTC_REVISION) & 0xff; |
a88ab430 | 156 | |
7852ec05 | 157 | pr_info("IRQ: Found an INTC at 0x%p (revision %ld.%ld) with %d interrupts\n", |
a88ab430 | 158 | omap_irq_base, tmp >> 4, tmp & 0xf, omap_nr_irqs); |
1dbae815 | 159 | |
71be00c9 | 160 | tmp = intc_readl(INTC_SYSCONFIG); |
1dbae815 | 161 | tmp |= 1 << 1; /* soft reset */ |
71be00c9 | 162 | intc_writel(INTC_SYSCONFIG, tmp); |
1dbae815 | 163 | |
71be00c9 | 164 | while (!(intc_readl(INTC_SYSSTATUS) & 0x1)) |
1dbae815 | 165 | /* Wait for reset to complete */; |
375e12ab JY |
166 | |
167 | /* Enable autoidle */ | |
71be00c9 | 168 | intc_writel(INTC_SYSCONFIG, 1 << 0); |
1dbae815 TL |
169 | } |
170 | ||
94434535 JH |
171 | int omap_irq_pending(void) |
172 | { | |
6bd0f16e | 173 | int i; |
94434535 | 174 | |
6bd0f16e FB |
175 | for (i = 0; i < omap_nr_pending; i++) |
176 | if (intc_readl(INTC_PENDING_IRQ0 + (0x20 * i))) | |
a88ab430 | 177 | return 1; |
94434535 JH |
178 | return 0; |
179 | } | |
180 | ||
131b48c0 FB |
181 | void omap3_intc_suspend(void) |
182 | { | |
183 | /* A pending interrupt would prevent OMAP from entering suspend */ | |
184 | omap_ack_irq(NULL); | |
185 | } | |
186 | ||
55601c9f FB |
187 | static int __init omap_alloc_gc_of(struct irq_domain *d, void __iomem *base) |
188 | { | |
189 | int ret; | |
190 | int i; | |
191 | ||
192 | ret = irq_alloc_domain_generic_chips(d, 32, 1, "INTC", | |
193 | handle_level_irq, IRQ_NOREQUEST | IRQ_NOPROBE, | |
194 | IRQ_LEVEL, 0); | |
195 | if (ret) { | |
196 | pr_warn("Failed to allocate irq chips\n"); | |
197 | return ret; | |
198 | } | |
199 | ||
200 | for (i = 0; i < omap_nr_pending; i++) { | |
201 | struct irq_chip_generic *gc; | |
202 | struct irq_chip_type *ct; | |
203 | ||
204 | gc = irq_get_domain_generic_chip(d, 32 * i); | |
205 | gc->reg_base = base; | |
206 | ct = gc->chip_types; | |
207 | ||
208 | ct->type = IRQ_TYPE_LEVEL_MASK; | |
55601c9f FB |
209 | |
210 | ct->chip.irq_ack = omap_mask_ack_irq; | |
211 | ct->chip.irq_mask = irq_gc_mask_disable_reg; | |
212 | ct->chip.irq_unmask = irq_gc_unmask_enable_reg; | |
213 | ||
214 | ct->chip.flags |= IRQCHIP_SKIP_SET_WAKE; | |
215 | ||
216 | ct->regs.enable = INTC_MIR_CLEAR0 + 32 * i; | |
217 | ct->regs.disable = INTC_MIR_SET0 + 32 * i; | |
218 | } | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static void __init omap_alloc_gc_legacy(void __iomem *base, | |
224 | unsigned int irq_start, unsigned int num) | |
667a11fa TL |
225 | { |
226 | struct irq_chip_generic *gc; | |
227 | struct irq_chip_type *ct; | |
228 | ||
229 | gc = irq_alloc_generic_chip("INTC", 1, irq_start, base, | |
55601c9f | 230 | handle_level_irq); |
667a11fa TL |
231 | ct = gc->chip_types; |
232 | ct->chip.irq_ack = omap_mask_ack_irq; | |
233 | ct->chip.irq_mask = irq_gc_mask_disable_reg; | |
234 | ct->chip.irq_unmask = irq_gc_unmask_enable_reg; | |
e3c83c2d | 235 | ct->chip.flags |= IRQCHIP_SKIP_SET_WAKE; |
667a11fa | 236 | |
667a11fa TL |
237 | ct->regs.enable = INTC_MIR_CLEAR0; |
238 | ct->regs.disable = INTC_MIR_SET0; | |
239 | irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, | |
55601c9f | 240 | IRQ_NOREQUEST | IRQ_NOPROBE, 0); |
667a11fa TL |
241 | } |
242 | ||
55601c9f FB |
243 | static int __init omap_init_irq_of(struct device_node *node) |
244 | { | |
245 | int ret; | |
246 | ||
247 | omap_irq_base = of_iomap(node, 0); | |
248 | if (WARN_ON(!omap_irq_base)) | |
249 | return -ENOMEM; | |
250 | ||
251 | domain = irq_domain_add_linear(node, omap_nr_irqs, | |
252 | &irq_generic_chip_ops, NULL); | |
253 | ||
254 | omap_irq_soft_reset(); | |
255 | ||
256 | ret = omap_alloc_gc_of(domain, omap_irq_base); | |
257 | if (ret < 0) | |
258 | irq_domain_remove(domain); | |
259 | ||
260 | return ret; | |
261 | } | |
262 | ||
4b149e41 | 263 | static int __init omap_init_irq_legacy(u32 base, struct device_node *node) |
1dbae815 | 264 | { |
a88ab430 | 265 | int j, irq_base; |
1dbae815 | 266 | |
741e3a89 TL |
267 | omap_irq_base = ioremap(base, SZ_4K); |
268 | if (WARN_ON(!omap_irq_base)) | |
55601c9f | 269 | return -ENOMEM; |
741e3a89 | 270 | |
a74f0a17 | 271 | irq_base = irq_alloc_descs(-1, 0, omap_nr_irqs, 0); |
52fa2120 BC |
272 | if (irq_base < 0) { |
273 | pr_warn("Couldn't allocate IRQ numbers\n"); | |
274 | irq_base = 0; | |
275 | } | |
276 | ||
4b149e41 | 277 | domain = irq_domain_add_legacy(node, omap_nr_irqs, irq_base, 0, |
a88ab430 | 278 | &irq_domain_simple_ops, NULL); |
1dbae815 | 279 | |
a88ab430 | 280 | omap_irq_soft_reset(); |
667a11fa | 281 | |
a88ab430 | 282 | for (j = 0; j < omap_nr_irqs; j += 32) |
55601c9f FB |
283 | omap_alloc_gc_legacy(omap_irq_base + j, j + irq_base, 32); |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
9836ee9f FB |
288 | static void __init omap_irq_enable_protection(void) |
289 | { | |
290 | u32 reg; | |
291 | ||
292 | reg = intc_readl(INTC_PROTECTION); | |
293 | reg |= INTC_PROTECTION_ENABLE; | |
294 | intc_writel(INTC_PROTECTION, reg); | |
295 | } | |
296 | ||
55601c9f FB |
297 | static int __init omap_init_irq(u32 base, struct device_node *node) |
298 | { | |
9836ee9f FB |
299 | int ret; |
300 | ||
4b149e41 FB |
301 | /* |
302 | * FIXME legacy OMAP DMA driver sitting under arch/arm/plat-omap/dma.c | |
303 | * depends is still not ready for linear IRQ domains; because of that | |
304 | * we need to temporarily "blacklist" OMAP2 and OMAP3 devices from using | |
305 | * linear IRQ Domain until that driver is finally fixed. | |
306 | */ | |
307 | if (of_device_is_compatible(node, "ti,omap2-intc") || | |
308 | of_device_is_compatible(node, "ti,omap3-intc")) { | |
309 | struct resource res; | |
310 | ||
311 | if (of_address_to_resource(node, 0, &res)) | |
312 | return -ENOMEM; | |
313 | ||
314 | base = res.start; | |
315 | ret = omap_init_irq_legacy(base, node); | |
316 | } else if (node) { | |
9836ee9f | 317 | ret = omap_init_irq_of(node); |
4b149e41 FB |
318 | } else { |
319 | ret = omap_init_irq_legacy(base, NULL); | |
320 | } | |
9836ee9f FB |
321 | |
322 | if (ret == 0) | |
323 | omap_irq_enable_protection(); | |
324 | ||
325 | return ret; | |
1dbae815 TL |
326 | } |
327 | ||
2aced892 FB |
328 | static asmlinkage void __exception_irq_entry |
329 | omap_intc_handle_irq(struct pt_regs *regs) | |
2db14997 | 330 | { |
d3b421cd | 331 | extern unsigned long irq_err_count; |
6ed34648 | 332 | u32 irqnr; |
2db14997 | 333 | |
6ed34648 | 334 | irqnr = intc_readl(INTC_SIR); |
d3b421cd SN |
335 | |
336 | /* | |
337 | * A spurious IRQ can result if interrupt that triggered the | |
338 | * sorting is no longer active during the sorting (10 INTC | |
339 | * functional clock cycles after interrupt assertion). Or a | |
340 | * change in interrupt mask affected the result during sorting | |
341 | * time. There is no special handling required except ignoring | |
342 | * the SIR register value just read and retrying. | |
343 | * See section 6.2.5 of AM335x TRM Literature Number: SPRUH73K | |
344 | * | |
345 | * Many a times, a spurious interrupt situation has been fixed | |
346 | * by adding a flush for the posted write acking the IRQ in | |
347 | * the device driver. Typically, this is going be the device | |
348 | * driver whose interrupt was handled just before the spurious | |
349 | * IRQ occurred. Pay attention to those device drivers if you | |
350 | * run into hitting the spurious IRQ condition below. | |
351 | */ | |
352 | if (unlikely((irqnr & SPURIOUSIRQ_MASK) == SPURIOUSIRQ_MASK)) { | |
353 | pr_err_once("%s: spurious irq!\n", __func__); | |
354 | irq_err_count++; | |
355 | omap_ack_irq(NULL); | |
356 | return; | |
357 | } | |
358 | ||
6ed34648 | 359 | irqnr &= ACTIVEIRQ_MASK; |
6ed34648 | 360 | handle_domain_irq(domain, irqnr, regs); |
2db14997 MZ |
361 | } |
362 | ||
00b6b031 | 363 | static int __init intc_of_init(struct device_node *node, |
52fa2120 BC |
364 | struct device_node *parent) |
365 | { | |
55601c9f | 366 | int ret; |
a74f0a17 | 367 | |
52b1e129 | 368 | omap_nr_pending = 3; |
a74f0a17 | 369 | omap_nr_irqs = 96; |
52fa2120 BC |
370 | |
371 | if (WARN_ON(!node)) | |
372 | return -ENODEV; | |
373 | ||
19f92b23 TL |
374 | if (of_device_is_compatible(node, "ti,dm814-intc") || |
375 | of_device_is_compatible(node, "ti,dm816-intc") || | |
376 | of_device_is_compatible(node, "ti,am33xx-intc")) { | |
a74f0a17 | 377 | omap_nr_irqs = 128; |
52b1e129 FB |
378 | omap_nr_pending = 4; |
379 | } | |
470f30de | 380 | |
55601c9f FB |
381 | ret = omap_init_irq(-1, of_node_get(node)); |
382 | if (ret < 0) | |
383 | return ret; | |
52fa2120 | 384 | |
2aced892 | 385 | set_handle_irq(omap_intc_handle_irq); |
b15c76b7 | 386 | |
52fa2120 BC |
387 | return 0; |
388 | } | |
389 | ||
a35db9a4 FB |
390 | IRQCHIP_DECLARE(omap2_intc, "ti,omap2-intc", intc_of_init); |
391 | IRQCHIP_DECLARE(omap3_intc, "ti,omap3-intc", intc_of_init); | |
19f92b23 TL |
392 | IRQCHIP_DECLARE(dm814x_intc, "ti,dm814-intc", intc_of_init); |
393 | IRQCHIP_DECLARE(dm816x_intc, "ti,dm816-intc", intc_of_init); | |
a35db9a4 | 394 | IRQCHIP_DECLARE(am33xx_intc, "ti,am33xx-intc", intc_of_init); |