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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> |
1dbae815 | 18 | #include <asm/mach/irq.h> |
1dbae815 | 19 | |
2e7509e5 PW |
20 | |
21 | /* selected INTC register offsets */ | |
22 | ||
23 | #define INTC_REVISION 0x0000 | |
24 | #define INTC_SYSCONFIG 0x0010 | |
25 | #define INTC_SYSSTATUS 0x0014 | |
6ccc4c0d | 26 | #define INTC_SIR 0x0040 |
2e7509e5 | 27 | #define INTC_CONTROL 0x0048 |
0addd61b RN |
28 | #define INTC_PROTECTION 0x004C |
29 | #define INTC_IDLE 0x0050 | |
30 | #define INTC_THRESHOLD 0x0068 | |
31 | #define INTC_MIR0 0x0084 | |
2e7509e5 PW |
32 | #define INTC_MIR_CLEAR0 0x0088 |
33 | #define INTC_MIR_SET0 0x008c | |
34 | #define INTC_PENDING_IRQ0 0x0098 | |
2e7509e5 PW |
35 | /* Number of IRQ state bits in each MIR register */ |
36 | #define IRQ_BITS_PER_REG 32 | |
1dbae815 TL |
37 | |
38 | /* | |
39 | * OMAP2 has a number of different interrupt controllers, each interrupt | |
40 | * controller is identified as its own "bank". Register definitions are | |
41 | * fairly consistent for each bank, but not all registers are implemented | |
42 | * for each bank.. when in doubt, consult the TRM. | |
43 | */ | |
44 | static struct omap_irq_bank { | |
e8a91c95 | 45 | void __iomem *base_reg; |
1dbae815 TL |
46 | unsigned int nr_irqs; |
47 | } __attribute__ ((aligned(4))) irq_banks[] = { | |
48 | { | |
49 | /* MPU INTC */ | |
1dbae815 | 50 | .nr_irqs = 96, |
646e3ed1 | 51 | }, |
1dbae815 TL |
52 | }; |
53 | ||
0addd61b RN |
54 | /* Structure to save interrupt controller context */ |
55 | struct omap3_intc_regs { | |
56 | u32 sysconfig; | |
57 | u32 protection; | |
58 | u32 idle; | |
59 | u32 threshold; | |
60 | u32 ilr[INTCPS_NR_IRQS]; | |
61 | u32 mir[INTCPS_NR_MIR_REGS]; | |
62 | }; | |
63 | ||
64 | static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)]; | |
65 | ||
2e7509e5 PW |
66 | /* INTC bank register get/set */ |
67 | ||
68 | static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg) | |
69 | { | |
70 | __raw_writel(val, bank->base_reg + reg); | |
71 | } | |
72 | ||
73 | static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg) | |
74 | { | |
75 | return __raw_readl(bank->base_reg + reg); | |
76 | } | |
77 | ||
6ccc4c0d TL |
78 | static int previous_irq; |
79 | ||
80 | /* | |
81 | * On 34xx we can get occasional spurious interrupts if the ack from | |
82 | * an interrupt handler does not get posted before we unmask. Warn about | |
83 | * the interrupt handlers that need to flush posted writes. | |
84 | */ | |
85 | static int omap_check_spurious(unsigned int irq) | |
86 | { | |
87 | u32 sir, spurious; | |
88 | ||
89 | sir = intc_bank_read_reg(&irq_banks[0], INTC_SIR); | |
846c29f1 | 90 | spurious = sir >> 7; |
6ccc4c0d | 91 | |
846c29f1 | 92 | if (spurious) { |
6ccc4c0d TL |
93 | printk(KERN_WARNING "Spurious irq %i: 0x%08x, please flush " |
94 | "posted write for irq %i\n", | |
95 | irq, sir, previous_irq); | |
96 | return spurious; | |
97 | } | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
1dbae815 TL |
102 | /* XXX: FIQ and additional INTC support (only MPU at the moment) */ |
103 | static void omap_ack_irq(unsigned int irq) | |
104 | { | |
2e7509e5 | 105 | intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL); |
1dbae815 TL |
106 | } |
107 | ||
108 | static void omap_mask_irq(unsigned int irq) | |
109 | { | |
2e7509e5 | 110 | int offset = irq & (~(IRQ_BITS_PER_REG - 1)); |
1dbae815 | 111 | |
6ccc4c0d TL |
112 | if (cpu_is_omap34xx()) { |
113 | int spurious = 0; | |
114 | ||
115 | /* | |
116 | * INT_34XX_GPT12_IRQ is also the spurious irq. Maybe because | |
117 | * it is the highest irq number? | |
118 | */ | |
119 | if (irq == INT_34XX_GPT12_IRQ) | |
120 | spurious = omap_check_spurious(irq); | |
121 | ||
122 | if (!spurious) | |
123 | previous_irq = irq; | |
124 | } | |
125 | ||
2e7509e5 | 126 | irq &= (IRQ_BITS_PER_REG - 1); |
1dbae815 | 127 | |
2e7509e5 | 128 | intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_SET0 + offset); |
1dbae815 TL |
129 | } |
130 | ||
131 | static void omap_unmask_irq(unsigned int irq) | |
132 | { | |
2e7509e5 | 133 | int offset = irq & (~(IRQ_BITS_PER_REG - 1)); |
1dbae815 | 134 | |
2e7509e5 | 135 | irq &= (IRQ_BITS_PER_REG - 1); |
1dbae815 | 136 | |
2e7509e5 | 137 | intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_CLEAR0 + offset); |
1dbae815 TL |
138 | } |
139 | ||
140 | static void omap_mask_ack_irq(unsigned int irq) | |
141 | { | |
142 | omap_mask_irq(irq); | |
143 | omap_ack_irq(irq); | |
144 | } | |
145 | ||
38c677cb DB |
146 | static struct irq_chip omap_irq_chip = { |
147 | .name = "INTC", | |
1dbae815 TL |
148 | .ack = omap_mask_ack_irq, |
149 | .mask = omap_mask_irq, | |
150 | .unmask = omap_unmask_irq, | |
151 | }; | |
152 | ||
153 | static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank) | |
154 | { | |
155 | unsigned long tmp; | |
156 | ||
2e7509e5 | 157 | tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff; |
e8a91c95 | 158 | printk(KERN_INFO "IRQ: Found an INTC at 0x%p " |
1dbae815 TL |
159 | "(revision %ld.%ld) with %d interrupts\n", |
160 | bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs); | |
161 | ||
2e7509e5 | 162 | tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG); |
1dbae815 | 163 | tmp |= 1 << 1; /* soft reset */ |
2e7509e5 | 164 | intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG); |
1dbae815 | 165 | |
2e7509e5 | 166 | while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1)) |
1dbae815 | 167 | /* Wait for reset to complete */; |
375e12ab JY |
168 | |
169 | /* Enable autoidle */ | |
2e7509e5 | 170 | intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG); |
1dbae815 TL |
171 | } |
172 | ||
94434535 JH |
173 | int omap_irq_pending(void) |
174 | { | |
175 | int i; | |
176 | ||
177 | for (i = 0; i < ARRAY_SIZE(irq_banks); i++) { | |
178 | struct omap_irq_bank *bank = irq_banks + i; | |
179 | int irq; | |
180 | ||
181 | for (irq = 0; irq < bank->nr_irqs; irq += 32) | |
182 | if (intc_bank_read_reg(bank, INTC_PENDING_IRQ0 + | |
183 | ((irq >> 5) << 5))) | |
184 | return 1; | |
185 | } | |
186 | return 0; | |
187 | } | |
188 | ||
1dbae815 TL |
189 | void __init omap_init_irq(void) |
190 | { | |
4b1135a2 | 191 | unsigned long nr_of_irqs = 0; |
1dbae815 TL |
192 | unsigned int nr_banks = 0; |
193 | int i; | |
194 | ||
195 | for (i = 0; i < ARRAY_SIZE(irq_banks); i++) { | |
74005a2b | 196 | unsigned long base = 0; |
1dbae815 TL |
197 | struct omap_irq_bank *bank = irq_banks + i; |
198 | ||
646e3ed1 | 199 | if (cpu_is_omap24xx()) |
1b26fe86 | 200 | base = OMAP24XX_IC_BASE; |
cc26b3b0 | 201 | else if (cpu_is_omap34xx()) |
1b26fe86 TL |
202 | base = OMAP34XX_IC_BASE; |
203 | ||
74005a2b KH |
204 | BUG_ON(!base); |
205 | ||
1b26fe86 TL |
206 | /* Static mapping, never released */ |
207 | bank->base_reg = ioremap(base, SZ_4K); | |
208 | if (!bank->base_reg) { | |
209 | printk(KERN_ERR "Could not ioremap irq bank%i\n", i); | |
210 | continue; | |
211 | } | |
2e7509e5 | 212 | |
1dbae815 TL |
213 | omap_irq_bank_init_one(bank); |
214 | ||
4b1135a2 | 215 | nr_of_irqs += bank->nr_irqs; |
1dbae815 TL |
216 | nr_banks++; |
217 | } | |
218 | ||
219 | printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n", | |
4b1135a2 | 220 | nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : ""); |
1dbae815 | 221 | |
4b1135a2 | 222 | for (i = 0; i < nr_of_irqs; i++) { |
1dbae815 | 223 | set_irq_chip(i, &omap_irq_chip); |
10dd5ce2 | 224 | set_irq_handler(i, handle_level_irq); |
1dbae815 TL |
225 | set_irq_flags(i, IRQF_VALID); |
226 | } | |
227 | } | |
228 | ||
0addd61b RN |
229 | #ifdef CONFIG_ARCH_OMAP3 |
230 | void omap_intc_save_context(void) | |
231 | { | |
232 | int ind = 0, i = 0; | |
233 | for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) { | |
234 | struct omap_irq_bank *bank = irq_banks + ind; | |
235 | intc_context[ind].sysconfig = | |
236 | intc_bank_read_reg(bank, INTC_SYSCONFIG); | |
237 | intc_context[ind].protection = | |
238 | intc_bank_read_reg(bank, INTC_PROTECTION); | |
239 | intc_context[ind].idle = | |
240 | intc_bank_read_reg(bank, INTC_IDLE); | |
241 | intc_context[ind].threshold = | |
242 | intc_bank_read_reg(bank, INTC_THRESHOLD); | |
243 | for (i = 0; i < INTCPS_NR_IRQS; i++) | |
244 | intc_context[ind].ilr[i] = | |
2329e7cc | 245 | intc_bank_read_reg(bank, (0x100 + 0x4*i)); |
0addd61b RN |
246 | for (i = 0; i < INTCPS_NR_MIR_REGS; i++) |
247 | intc_context[ind].mir[i] = | |
248 | intc_bank_read_reg(&irq_banks[0], INTC_MIR0 + | |
249 | (0x20 * i)); | |
250 | } | |
251 | } | |
252 | ||
253 | void omap_intc_restore_context(void) | |
254 | { | |
255 | int ind = 0, i = 0; | |
256 | ||
257 | for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) { | |
258 | struct omap_irq_bank *bank = irq_banks + ind; | |
259 | intc_bank_write_reg(intc_context[ind].sysconfig, | |
260 | bank, INTC_SYSCONFIG); | |
261 | intc_bank_write_reg(intc_context[ind].sysconfig, | |
262 | bank, INTC_SYSCONFIG); | |
263 | intc_bank_write_reg(intc_context[ind].protection, | |
264 | bank, INTC_PROTECTION); | |
265 | intc_bank_write_reg(intc_context[ind].idle, | |
266 | bank, INTC_IDLE); | |
267 | intc_bank_write_reg(intc_context[ind].threshold, | |
268 | bank, INTC_THRESHOLD); | |
269 | for (i = 0; i < INTCPS_NR_IRQS; i++) | |
270 | intc_bank_write_reg(intc_context[ind].ilr[i], | |
2329e7cc | 271 | bank, (0x100 + 0x4*i)); |
0addd61b RN |
272 | for (i = 0; i < INTCPS_NR_MIR_REGS; i++) |
273 | intc_bank_write_reg(intc_context[ind].mir[i], | |
274 | &irq_banks[0], INTC_MIR0 + (0x20 * i)); | |
275 | } | |
276 | /* MIRs are saved and restore with other PRCM registers */ | |
277 | } | |
2bbe3af3 TK |
278 | |
279 | void omap3_intc_suspend(void) | |
280 | { | |
281 | /* A pending interrupt would prevent OMAP from entering suspend */ | |
282 | omap_ack_irq(0); | |
283 | } | |
f18cc2ff TK |
284 | |
285 | void omap3_intc_prepare_idle(void) | |
286 | { | |
287 | /* Disable autoidle as it can stall interrupt controller */ | |
288 | intc_bank_write_reg(0, &irq_banks[0], INTC_SYSCONFIG); | |
289 | } | |
290 | ||
291 | void omap3_intc_resume_idle(void) | |
292 | { | |
293 | /* Re-enable autoidle */ | |
294 | intc_bank_write_reg(1, &irq_banks[0], INTC_SYSCONFIG); | |
295 | } | |
0addd61b | 296 | #endif /* CONFIG_ARCH_OMAP3 */ |