1 /*
2 * linux/arch/arm/mach-omap2/irq.c
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/module.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/io.h>
18
19 #include <asm/exception.h>
20 #include <asm/mach/irq.h>
21 #include <linux/irqdomain.h>
22 #include <linux/of.h>
23 #include <linux/of_address.h>
24
25 #include <mach/hardware.h>
26
27 #include "iomap.h"
28
29 /* selected INTC register offsets */
30
31 #define INTC_REVISION 0x0000
32 #define INTC_SYSCONFIG 0x0010
33 #define INTC_SYSSTATUS 0x0014
34 #define INTC_SIR 0x0040
35 #define INTC_CONTROL 0x0048
36 #define INTC_PROTECTION 0x004C
37 #define INTC_IDLE 0x0050
38 #define INTC_THRESHOLD 0x0068
39 #define INTC_MIR0 0x0084
40 #define INTC_MIR_CLEAR0 0x0088
41 #define INTC_MIR_SET0 0x008c
42 #define INTC_PENDING_IRQ0 0x0098
43 /* Number of IRQ state bits in each MIR register */
44 #define IRQ_BITS_PER_REG 32
45
46 #define OMAP2_IRQ_BASE OMAP2_L4_IO_ADDRESS(OMAP24XX_IC_BASE)
47 #define OMAP3_IRQ_BASE OMAP2_L4_IO_ADDRESS(OMAP34XX_IC_BASE)
48 #define INTCPS_SIR_IRQ_OFFSET 0x0040 /* omap2/3 active interrupt offset */
49 #define ACTIVEIRQ_MASK 0x7f /* omap2/3 active interrupt bits */
50
51 /*
52 * OMAP2 has a number of different interrupt controllers, each interrupt
53 * controller is identified as its own "bank". Register definitions are
54 * fairly consistent for each bank, but not all registers are implemented
55 * for each bank.. when in doubt, consult the TRM.
56 */
57 static struct omap_irq_bank {
58 void __iomem *base_reg;
59 unsigned int nr_irqs;
60 } __attribute__ ((aligned(4))) irq_banks[] = {
61 {
62 /* MPU INTC */
63 .nr_irqs = 96,
64 },
65 };
66
67 static struct irq_domain *domain;
68
69 /* Structure to save interrupt controller context */
70 struct omap3_intc_regs {
71 u32 sysconfig;
72 u32 protection;
73 u32 idle;
74 u32 threshold;
75 u32 ilr[INTCPS_NR_IRQS];
76 u32 mir[INTCPS_NR_MIR_REGS];
77 };
78
79 /* INTC bank register get/set */
80
intc_bank_write_reg(u32 val,struct omap_irq_bank * bank,u16 reg)81 static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg)
82 {
83 __raw_writel(val, bank->base_reg + reg);
84 }
85
intc_bank_read_reg(struct omap_irq_bank * bank,u16 reg)86 static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg)
87 {
88 return __raw_readl(bank->base_reg + reg);
89 }
90
91 /* XXX: FIQ and additional INTC support (only MPU at the moment) */
omap_ack_irq(struct irq_data * d)92 static void omap_ack_irq(struct irq_data *d)
93 {
94 intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
95 }
96
omap_mask_ack_irq(struct irq_data * d)97 static void omap_mask_ack_irq(struct irq_data *d)
98 {
99 irq_gc_mask_disable_reg(d);
100 omap_ack_irq(d);
101 }
102
omap_irq_bank_init_one(struct omap_irq_bank * bank)103 static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
104 {
105 unsigned long tmp;
106
107 tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff;
108 printk(KERN_INFO "IRQ: Found an INTC at 0x%p "
109 "(revision %ld.%ld) with %d interrupts\n",
110 bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);
111
112 tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG);
113 tmp |= 1 << 1; /* soft reset */
114 intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG);
115
116 while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1))
117 /* Wait for reset to complete */;
118
119 /* Enable autoidle */
120 intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG);
121 }
122
omap_irq_pending(void)123 int omap_irq_pending(void)
124 {
125 int i;
126
127 for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
128 struct omap_irq_bank *bank = irq_banks + i;
129 int irq;
130
131 for (irq = 0; irq < bank->nr_irqs; irq += 32)
132 if (intc_bank_read_reg(bank, INTC_PENDING_IRQ0 +
133 ((irq >> 5) << 5)))
134 return 1;
135 }
136 return 0;
137 }
138
139 static __init void
omap_alloc_gc(void __iomem * base,unsigned int irq_start,unsigned int num)140 omap_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
141 {
142 struct irq_chip_generic *gc;
143 struct irq_chip_type *ct;
144
145 gc = irq_alloc_generic_chip("INTC", 1, irq_start, base,
146 handle_level_irq);
147 ct = gc->chip_types;
148 ct->chip.irq_ack = omap_mask_ack_irq;
149 ct->chip.irq_mask = irq_gc_mask_disable_reg;
150 ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
151
152 ct->regs.ack = INTC_CONTROL;
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
omap_init_irq(u32 base,int nr_irqs,struct device_node * node)159 static void __init omap_init_irq(u32 base, int nr_irqs,
160 struct device_node *node)
161 {
162 void __iomem *omap_irq_base;
163 unsigned long nr_of_irqs = 0;
164 unsigned int nr_banks = 0;
165 int i, j, irq_base;
166
167 omap_irq_base = ioremap(base, SZ_4K);
168 if (WARN_ON(!omap_irq_base))
169 return;
170
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
180 for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
181 struct omap_irq_bank *bank = irq_banks + i;
182
183 bank->nr_irqs = nr_irqs;
184
185 /* Static mapping, never released */
186 bank->base_reg = ioremap(base, SZ_4K);
187 if (!bank->base_reg) {
188 pr_err("Could not ioremap irq bank%i\n", i);
189 continue;
190 }
191
192 omap_irq_bank_init_one(bank);
193
194 for (j = 0; j < bank->nr_irqs; j += 32)
195 omap_alloc_gc(bank->base_reg + j, j + irq_base, 32);
196
197 nr_of_irqs += bank->nr_irqs;
198 nr_banks++;
199 }
200
201 pr_info("Total of %ld interrupts on %d active controller%s\n",
202 nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");
203 }
204
omap2_init_irq(void)205 void __init omap2_init_irq(void)
206 {
207 omap_init_irq(OMAP24XX_IC_BASE, 96, NULL);
208 }
209
omap3_init_irq(void)210 void __init omap3_init_irq(void)
211 {
212 omap_init_irq(OMAP34XX_IC_BASE, 96, NULL);
213 }
214
ti81xx_init_irq(void)215 void __init ti81xx_init_irq(void)
216 {
217 omap_init_irq(OMAP34XX_IC_BASE, 128, NULL);
218 }
219
omap_intc_handle_irq(void __iomem * base_addr,struct pt_regs * regs)220 static inline void omap_intc_handle_irq(void __iomem *base_addr, struct pt_regs *regs)
221 {
222 u32 irqnr;
223 int handled_irq = 0;
224
225 do {
226 irqnr = readl_relaxed(base_addr + 0x98);
227 if (irqnr)
228 goto out;
229
230 irqnr = readl_relaxed(base_addr + 0xb8);
231 if (irqnr)
232 goto out;
233
234 irqnr = readl_relaxed(base_addr + 0xd8);
235 #ifdef CONFIG_SOC_OMAPTI816X
236 if (irqnr)
237 goto out;
238 irqnr = readl_relaxed(base_addr + 0xf8);
239 #endif
240
241 out:
242 if (!irqnr)
243 break;
244
245 irqnr = readl_relaxed(base_addr + INTCPS_SIR_IRQ_OFFSET);
246 irqnr &= ACTIVEIRQ_MASK;
247
248 if (irqnr) {
249 irqnr = irq_find_mapping(domain, irqnr);
250 handle_IRQ(irqnr, regs);
251 handled_irq = 1;
252 }
253 } while (irqnr);
254
255 /* If an irq is masked or deasserted while active, we will
256 * keep ending up here with no irq handled. So remove it from
257 * the INTC with an ack.*/
258 if (!handled_irq)
259 omap_ack_irq(NULL);
260 }
261
omap2_intc_handle_irq(struct pt_regs * regs)262 asmlinkage void __exception_irq_entry omap2_intc_handle_irq(struct pt_regs *regs)
263 {
264 void __iomem *base_addr = OMAP2_IRQ_BASE;
265 omap_intc_handle_irq(base_addr, regs);
266 }
267
omap_intc_of_init(struct device_node * node,struct device_node * parent)268 int __init omap_intc_of_init(struct device_node *node,
269 struct device_node *parent)
270 {
271 struct resource res;
272 u32 nr_irqs = 96;
273
274 if (WARN_ON(!node))
275 return -ENODEV;
276
277 if (of_address_to_resource(node, 0, &res)) {
278 WARN(1, "unable to get intc registers\n");
279 return -EINVAL;
280 }
281
282 if (of_property_read_u32(node, "ti,intc-size", &nr_irqs))
283 pr_warn("unable to get intc-size, default to %d\n", nr_irqs);
284
285 omap_init_irq(res.start, nr_irqs, of_node_get(node));
286
287 return 0;
288 }
289
290 #ifdef CONFIG_ARCH_OMAP3
291 static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)];
292
omap_intc_save_context(void)293 void omap_intc_save_context(void)
294 {
295 int ind = 0, i = 0;
296 for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
297 struct omap_irq_bank *bank = irq_banks + ind;
298 intc_context[ind].sysconfig =
299 intc_bank_read_reg(bank, INTC_SYSCONFIG);
300 intc_context[ind].protection =
301 intc_bank_read_reg(bank, INTC_PROTECTION);
302 intc_context[ind].idle =
303 intc_bank_read_reg(bank, INTC_IDLE);
304 intc_context[ind].threshold =
305 intc_bank_read_reg(bank, INTC_THRESHOLD);
306 for (i = 0; i < INTCPS_NR_IRQS; i++)
307 intc_context[ind].ilr[i] =
308 intc_bank_read_reg(bank, (0x100 + 0x4*i));
309 for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
310 intc_context[ind].mir[i] =
311 intc_bank_read_reg(&irq_banks[0], INTC_MIR0 +
312 (0x20 * i));
313 }
314 }
315
omap_intc_restore_context(void)316 void omap_intc_restore_context(void)
317 {
318 int ind = 0, i = 0;
319
320 for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
321 struct omap_irq_bank *bank = irq_banks + ind;
322 intc_bank_write_reg(intc_context[ind].sysconfig,
323 bank, INTC_SYSCONFIG);
324 intc_bank_write_reg(intc_context[ind].sysconfig,
325 bank, INTC_SYSCONFIG);
326 intc_bank_write_reg(intc_context[ind].protection,
327 bank, INTC_PROTECTION);
328 intc_bank_write_reg(intc_context[ind].idle,
329 bank, INTC_IDLE);
330 intc_bank_write_reg(intc_context[ind].threshold,
331 bank, INTC_THRESHOLD);
332 for (i = 0; i < INTCPS_NR_IRQS; i++)
333 intc_bank_write_reg(intc_context[ind].ilr[i],
334 bank, (0x100 + 0x4*i));
335 for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
336 intc_bank_write_reg(intc_context[ind].mir[i],
337 &irq_banks[0], INTC_MIR0 + (0x20 * i));
338 }
339 /* MIRs are saved and restore with other PRCM registers */
340 }
341
omap3_intc_suspend(void)342 void omap3_intc_suspend(void)
343 {
344 /* A pending interrupt would prevent OMAP from entering suspend */
345 omap_ack_irq(0);
346 }
347
omap3_intc_prepare_idle(void)348 void omap3_intc_prepare_idle(void)
349 {
350 /*
351 * Disable autoidle as it can stall interrupt controller,
352 * cf. errata ID i540 for 3430 (all revisions up to 3.1.x)
353 */
354 intc_bank_write_reg(0, &irq_banks[0], INTC_SYSCONFIG);
355 }
356
omap3_intc_resume_idle(void)357 void omap3_intc_resume_idle(void)
358 {
359 /* Re-enable autoidle */
360 intc_bank_write_reg(1, &irq_banks[0], INTC_SYSCONFIG);
361 }
362
omap3_intc_handle_irq(struct pt_regs * regs)363 asmlinkage void __exception_irq_entry omap3_intc_handle_irq(struct pt_regs *regs)
364 {
365 void __iomem *base_addr = OMAP3_IRQ_BASE;
366 omap_intc_handle_irq(base_addr, regs);
367 }
368 #endif /* CONFIG_ARCH_OMAP3 */
369