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> | |
14 | #include <linux/init.h> | |
1dbae815 | 15 | #include <linux/interrupt.h> |
2e7509e5 | 16 | #include <linux/io.h> |
a09e64fb | 17 | #include <mach/hardware.h> |
2db14997 | 18 | #include <asm/exception.h> |
1dbae815 | 19 | #include <asm/mach/irq.h> |
1dbae815 | 20 | |
2e7509e5 PW |
21 | |
22 | /* selected INTC register offsets */ | |
23 | ||
24 | #define INTC_REVISION 0x0000 | |
25 | #define INTC_SYSCONFIG 0x0010 | |
26 | #define INTC_SYSSTATUS 0x0014 | |
6ccc4c0d | 27 | #define INTC_SIR 0x0040 |
2e7509e5 | 28 | #define INTC_CONTROL 0x0048 |
0addd61b RN |
29 | #define INTC_PROTECTION 0x004C |
30 | #define INTC_IDLE 0x0050 | |
31 | #define INTC_THRESHOLD 0x0068 | |
32 | #define INTC_MIR0 0x0084 | |
2e7509e5 PW |
33 | #define INTC_MIR_CLEAR0 0x0088 |
34 | #define INTC_MIR_SET0 0x008c | |
35 | #define INTC_PENDING_IRQ0 0x0098 | |
2e7509e5 PW |
36 | /* Number of IRQ state bits in each MIR register */ |
37 | #define IRQ_BITS_PER_REG 32 | |
1dbae815 | 38 | |
2db14997 MZ |
39 | #define OMAP2_IRQ_BASE OMAP2_L4_IO_ADDRESS(OMAP24XX_IC_BASE) |
40 | #define OMAP3_IRQ_BASE OMAP2_L4_IO_ADDRESS(OMAP34XX_IC_BASE) | |
41 | #define INTCPS_SIR_IRQ_OFFSET 0x0040 /* omap2/3 active interrupt offset */ | |
42 | #define ACTIVEIRQ_MASK 0x7f /* omap2/3 active interrupt bits */ | |
43 | ||
1dbae815 TL |
44 | /* |
45 | * OMAP2 has a number of different interrupt controllers, each interrupt | |
46 | * controller is identified as its own "bank". Register definitions are | |
47 | * fairly consistent for each bank, but not all registers are implemented | |
48 | * for each bank.. when in doubt, consult the TRM. | |
49 | */ | |
50 | static struct omap_irq_bank { | |
e8a91c95 | 51 | void __iomem *base_reg; |
1dbae815 TL |
52 | unsigned int nr_irqs; |
53 | } __attribute__ ((aligned(4))) irq_banks[] = { | |
54 | { | |
55 | /* MPU INTC */ | |
1dbae815 | 56 | .nr_irqs = 96, |
646e3ed1 | 57 | }, |
1dbae815 TL |
58 | }; |
59 | ||
0addd61b RN |
60 | /* Structure to save interrupt controller context */ |
61 | struct omap3_intc_regs { | |
62 | u32 sysconfig; | |
63 | u32 protection; | |
64 | u32 idle; | |
65 | u32 threshold; | |
66 | u32 ilr[INTCPS_NR_IRQS]; | |
67 | u32 mir[INTCPS_NR_MIR_REGS]; | |
68 | }; | |
69 | ||
2e7509e5 PW |
70 | /* INTC bank register get/set */ |
71 | ||
72 | static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg) | |
73 | { | |
74 | __raw_writel(val, bank->base_reg + reg); | |
75 | } | |
76 | ||
77 | static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg) | |
78 | { | |
79 | return __raw_readl(bank->base_reg + reg); | |
80 | } | |
81 | ||
1dbae815 | 82 | /* XXX: FIQ and additional INTC support (only MPU at the moment) */ |
df303477 | 83 | static void omap_ack_irq(struct irq_data *d) |
1dbae815 | 84 | { |
2e7509e5 | 85 | intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL); |
1dbae815 TL |
86 | } |
87 | ||
df303477 | 88 | static void omap_mask_ack_irq(struct irq_data *d) |
1dbae815 | 89 | { |
667a11fa | 90 | irq_gc_mask_disable_reg(d); |
df303477 | 91 | omap_ack_irq(d); |
1dbae815 TL |
92 | } |
93 | ||
1dbae815 TL |
94 | static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank) |
95 | { | |
96 | unsigned long tmp; | |
97 | ||
2e7509e5 | 98 | tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff; |
e8a91c95 | 99 | printk(KERN_INFO "IRQ: Found an INTC at 0x%p " |
1dbae815 TL |
100 | "(revision %ld.%ld) with %d interrupts\n", |
101 | bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs); | |
102 | ||
2e7509e5 | 103 | tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG); |
1dbae815 | 104 | tmp |= 1 << 1; /* soft reset */ |
2e7509e5 | 105 | intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG); |
1dbae815 | 106 | |
2e7509e5 | 107 | while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1)) |
1dbae815 | 108 | /* Wait for reset to complete */; |
375e12ab JY |
109 | |
110 | /* Enable autoidle */ | |
2e7509e5 | 111 | intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG); |
1dbae815 TL |
112 | } |
113 | ||
94434535 JH |
114 | int omap_irq_pending(void) |
115 | { | |
116 | int i; | |
117 | ||
118 | for (i = 0; i < ARRAY_SIZE(irq_banks); i++) { | |
119 | struct omap_irq_bank *bank = irq_banks + i; | |
120 | int irq; | |
121 | ||
122 | for (irq = 0; irq < bank->nr_irqs; irq += 32) | |
123 | if (intc_bank_read_reg(bank, INTC_PENDING_IRQ0 + | |
124 | ((irq >> 5) << 5))) | |
125 | return 1; | |
126 | } | |
127 | return 0; | |
128 | } | |
129 | ||
667a11fa TL |
130 | static __init void |
131 | omap_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num) | |
132 | { | |
133 | struct irq_chip_generic *gc; | |
134 | struct irq_chip_type *ct; | |
135 | ||
136 | gc = irq_alloc_generic_chip("INTC", 1, irq_start, base, | |
137 | handle_level_irq); | |
138 | ct = gc->chip_types; | |
139 | ct->chip.irq_ack = omap_mask_ack_irq; | |
140 | ct->chip.irq_mask = irq_gc_mask_disable_reg; | |
141 | ct->chip.irq_unmask = irq_gc_unmask_enable_reg; | |
142 | ||
143 | ct->regs.ack = INTC_CONTROL; | |
144 | ct->regs.enable = INTC_MIR_CLEAR0; | |
145 | ct->regs.disable = INTC_MIR_SET0; | |
146 | irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, | |
147 | IRQ_NOREQUEST | IRQ_NOPROBE, 0); | |
148 | } | |
149 | ||
741e3a89 | 150 | static void __init omap_init_irq(u32 base, int nr_irqs) |
1dbae815 | 151 | { |
4b1135a2 | 152 | unsigned long nr_of_irqs = 0; |
1dbae815 | 153 | unsigned int nr_banks = 0; |
667a11fa | 154 | int i, j; |
1dbae815 | 155 | |
741e3a89 TL |
156 | omap_irq_base = ioremap(base, SZ_4K); |
157 | if (WARN_ON(!omap_irq_base)) | |
158 | return; | |
159 | ||
1dbae815 TL |
160 | for (i = 0; i < ARRAY_SIZE(irq_banks); i++) { |
161 | struct omap_irq_bank *bank = irq_banks + i; | |
162 | ||
741e3a89 | 163 | bank->nr_irqs = nr_irqs; |
01001712 | 164 | |
1b26fe86 TL |
165 | /* Static mapping, never released */ |
166 | bank->base_reg = ioremap(base, SZ_4K); | |
167 | if (!bank->base_reg) { | |
168 | printk(KERN_ERR "Could not ioremap irq bank%i\n", i); | |
169 | continue; | |
170 | } | |
2e7509e5 | 171 | |
1dbae815 TL |
172 | omap_irq_bank_init_one(bank); |
173 | ||
5c30cdfa TU |
174 | for (j = 0; j < bank->nr_irqs; j += 32) |
175 | omap_alloc_gc(bank->base_reg + j, j, 32); | |
667a11fa | 176 | |
4b1135a2 | 177 | nr_of_irqs += bank->nr_irqs; |
1dbae815 TL |
178 | nr_banks++; |
179 | } | |
180 | ||
181 | printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n", | |
4b1135a2 | 182 | nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : ""); |
1dbae815 TL |
183 | } |
184 | ||
741e3a89 TL |
185 | void __init omap2_init_irq(void) |
186 | { | |
187 | omap_init_irq(OMAP24XX_IC_BASE, 96); | |
188 | } | |
189 | ||
190 | void __init omap3_init_irq(void) | |
191 | { | |
192 | omap_init_irq(OMAP34XX_IC_BASE, 96); | |
193 | } | |
194 | ||
195 | void __init ti816x_init_irq(void) | |
196 | { | |
197 | omap_init_irq(OMAP34XX_IC_BASE, 128); | |
198 | } | |
199 | ||
2db14997 MZ |
200 | static inline void omap_intc_handle_irq(void __iomem *base_addr, struct pt_regs *regs) |
201 | { | |
202 | u32 irqnr; | |
203 | ||
204 | do { | |
205 | irqnr = readl_relaxed(base_addr + 0x98); | |
206 | if (irqnr) | |
207 | goto out; | |
208 | ||
209 | irqnr = readl_relaxed(base_addr + 0xb8); | |
210 | if (irqnr) | |
211 | goto out; | |
212 | ||
213 | irqnr = readl_relaxed(base_addr + 0xd8); | |
214 | #ifdef CONFIG_SOC_OMAPTI816X | |
215 | if (irqnr) | |
216 | goto out; | |
217 | irqnr = readl_relaxed(base_addr + 0xf8); | |
218 | #endif | |
219 | ||
220 | out: | |
221 | if (!irqnr) | |
222 | break; | |
223 | ||
224 | irqnr = readl_relaxed(base_addr + INTCPS_SIR_IRQ_OFFSET); | |
225 | irqnr &= ACTIVEIRQ_MASK; | |
226 | ||
227 | if (irqnr) | |
228 | handle_IRQ(irqnr, regs); | |
229 | } while (irqnr); | |
230 | } | |
231 | ||
232 | asmlinkage void __exception_irq_entry omap2_intc_handle_irq(struct pt_regs *regs) | |
233 | { | |
234 | void __iomem *base_addr = OMAP2_IRQ_BASE; | |
235 | omap_intc_handle_irq(base_addr, regs); | |
236 | } | |
237 | ||
0addd61b | 238 | #ifdef CONFIG_ARCH_OMAP3 |
ee23b93d FB |
239 | static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)]; |
240 | ||
0addd61b RN |
241 | void omap_intc_save_context(void) |
242 | { | |
243 | int ind = 0, i = 0; | |
244 | for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) { | |
245 | struct omap_irq_bank *bank = irq_banks + ind; | |
246 | intc_context[ind].sysconfig = | |
247 | intc_bank_read_reg(bank, INTC_SYSCONFIG); | |
248 | intc_context[ind].protection = | |
249 | intc_bank_read_reg(bank, INTC_PROTECTION); | |
250 | intc_context[ind].idle = | |
251 | intc_bank_read_reg(bank, INTC_IDLE); | |
252 | intc_context[ind].threshold = | |
253 | intc_bank_read_reg(bank, INTC_THRESHOLD); | |
254 | for (i = 0; i < INTCPS_NR_IRQS; i++) | |
255 | intc_context[ind].ilr[i] = | |
2329e7cc | 256 | intc_bank_read_reg(bank, (0x100 + 0x4*i)); |
0addd61b RN |
257 | for (i = 0; i < INTCPS_NR_MIR_REGS; i++) |
258 | intc_context[ind].mir[i] = | |
259 | intc_bank_read_reg(&irq_banks[0], INTC_MIR0 + | |
260 | (0x20 * i)); | |
261 | } | |
262 | } | |
263 | ||
264 | void omap_intc_restore_context(void) | |
265 | { | |
266 | int ind = 0, i = 0; | |
267 | ||
268 | for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) { | |
269 | struct omap_irq_bank *bank = irq_banks + ind; | |
270 | intc_bank_write_reg(intc_context[ind].sysconfig, | |
271 | bank, INTC_SYSCONFIG); | |
272 | intc_bank_write_reg(intc_context[ind].sysconfig, | |
273 | bank, INTC_SYSCONFIG); | |
274 | intc_bank_write_reg(intc_context[ind].protection, | |
275 | bank, INTC_PROTECTION); | |
276 | intc_bank_write_reg(intc_context[ind].idle, | |
277 | bank, INTC_IDLE); | |
278 | intc_bank_write_reg(intc_context[ind].threshold, | |
279 | bank, INTC_THRESHOLD); | |
280 | for (i = 0; i < INTCPS_NR_IRQS; i++) | |
281 | intc_bank_write_reg(intc_context[ind].ilr[i], | |
2329e7cc | 282 | bank, (0x100 + 0x4*i)); |
0addd61b RN |
283 | for (i = 0; i < INTCPS_NR_MIR_REGS; i++) |
284 | intc_bank_write_reg(intc_context[ind].mir[i], | |
285 | &irq_banks[0], INTC_MIR0 + (0x20 * i)); | |
286 | } | |
287 | /* MIRs are saved and restore with other PRCM registers */ | |
288 | } | |
2bbe3af3 TK |
289 | |
290 | void omap3_intc_suspend(void) | |
291 | { | |
292 | /* A pending interrupt would prevent OMAP from entering suspend */ | |
293 | omap_ack_irq(0); | |
294 | } | |
f18cc2ff TK |
295 | |
296 | void omap3_intc_prepare_idle(void) | |
297 | { | |
447b8da5 JP |
298 | /* |
299 | * Disable autoidle as it can stall interrupt controller, | |
300 | * cf. errata ID i540 for 3430 (all revisions up to 3.1.x) | |
301 | */ | |
f18cc2ff TK |
302 | intc_bank_write_reg(0, &irq_banks[0], INTC_SYSCONFIG); |
303 | } | |
304 | ||
305 | void omap3_intc_resume_idle(void) | |
306 | { | |
307 | /* Re-enable autoidle */ | |
308 | intc_bank_write_reg(1, &irq_banks[0], INTC_SYSCONFIG); | |
309 | } | |
2db14997 MZ |
310 | |
311 | asmlinkage void __exception_irq_entry omap3_intc_handle_irq(struct pt_regs *regs) | |
312 | { | |
313 | void __iomem *base_addr = OMAP3_IRQ_BASE; | |
314 | omap_intc_handle_irq(base_addr, regs); | |
315 | } | |
0addd61b | 316 | #endif /* CONFIG_ARCH_OMAP3 */ |