2 * linux/arch/arm/mach-omap2/irq.c
4 * Interrupt handler for OMAP2 boards.
6 * Copyright (C) 2005 Nokia Corporation
7 * Author: Paul Mundt <paul.mundt@nokia.com>
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
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
19 #include <asm/exception.h>
20 #include <asm/mach/irq.h>
21 #include <linux/irqdomain.h>
23 #include <linux/of_address.h>
25 #include <mach/hardware.h>
30 /* selected INTC register offsets */
32 #define INTC_REVISION 0x0000
33 #define INTC_SYSCONFIG 0x0010
34 #define INTC_SYSSTATUS 0x0014
35 #define INTC_SIR 0x0040
36 #define INTC_CONTROL 0x0048
37 #define INTC_PROTECTION 0x004C
38 #define INTC_IDLE 0x0050
39 #define INTC_THRESHOLD 0x0068
40 #define INTC_MIR0 0x0084
41 #define INTC_MIR_CLEAR0 0x0088
42 #define INTC_MIR_SET0 0x008c
43 #define INTC_PENDING_IRQ0 0x0098
44 /* Number of IRQ state bits in each MIR register */
45 #define IRQ_BITS_PER_REG 32
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 */
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.
58 static struct omap_irq_bank {
59 void __iomem *base_reg;
61 } __attribute__ ((aligned(4))) irq_banks[] = {
68 static struct irq_domain *domain;
70 /* Structure to save interrupt controller context */
71 struct omap3_intc_regs {
76 u32 ilr[INTCPS_NR_IRQS];
77 u32 mir[INTCPS_NR_MIR_REGS];
80 /* INTC bank register get/set */
82 static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg)
84 __raw_writel(val, bank->base_reg + reg);
87 static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg)
89 return __raw_readl(bank->base_reg + reg);
92 /* XXX: FIQ and additional INTC support (only MPU at the moment) */
93 static void omap_ack_irq(struct irq_data *d)
95 intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
98 static void omap_mask_ack_irq(struct irq_data *d)
100 irq_gc_mask_disable_reg(d);
104 static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
108 tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff;
109 printk(KERN_INFO "IRQ: Found an INTC at 0x%p "
110 "(revision %ld.%ld) with %d interrupts\n",
111 bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);
113 tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG);
114 tmp |= 1 << 1; /* soft reset */
115 intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG);
117 while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1))
118 /* Wait for reset to complete */;
120 /* Enable autoidle */
121 intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG);
124 int omap_irq_pending(void)
128 for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
129 struct omap_irq_bank *bank = irq_banks + i;
132 for (irq = 0; irq < bank->nr_irqs; irq += 32)
133 if (intc_bank_read_reg(bank, INTC_PENDING_IRQ0 +
141 omap_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
143 struct irq_chip_generic *gc;
144 struct irq_chip_type *ct;
146 gc = irq_alloc_generic_chip("INTC", 1, irq_start, base,
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;
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);
159 static void __init omap_init_irq(u32 base, int nr_irqs,
160 struct device_node *node)
162 void __iomem *omap_irq_base;
163 unsigned long nr_of_irqs = 0;
164 unsigned int nr_banks = 0;
167 omap_irq_base = ioremap(base, SZ_4K);
168 if (WARN_ON(!omap_irq_base))
171 irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
173 pr_warn("Couldn't allocate IRQ numbers\n");
177 domain = irq_domain_add_legacy(node, nr_irqs, irq_base, 0,
178 &irq_domain_simple_ops, NULL);
180 for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
181 struct omap_irq_bank *bank = irq_banks + i;
183 bank->nr_irqs = nr_irqs;
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);
192 omap_irq_bank_init_one(bank);
194 for (j = 0; j < bank->nr_irqs; j += 32)
195 omap_alloc_gc(bank->base_reg + j, j + irq_base, 32);
197 nr_of_irqs += bank->nr_irqs;
201 pr_info("Total of %ld interrupts on %d active controller%s\n",
202 nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");
205 void __init omap2_init_irq(void)
207 omap_init_irq(OMAP24XX_IC_BASE, 96, NULL);
210 void __init omap3_init_irq(void)
212 omap_init_irq(OMAP34XX_IC_BASE, 96, NULL);
215 void __init ti81xx_init_irq(void)
217 omap_init_irq(OMAP34XX_IC_BASE, 128, NULL);
220 static inline void omap_intc_handle_irq(void __iomem *base_addr, struct pt_regs *regs)
225 irqnr = readl_relaxed(base_addr + 0x98);
229 irqnr = readl_relaxed(base_addr + 0xb8);
233 irqnr = readl_relaxed(base_addr + 0xd8);
234 #ifdef CONFIG_SOC_TI81XX
237 irqnr = readl_relaxed(base_addr + 0xf8);
244 irqnr = readl_relaxed(base_addr + INTCPS_SIR_IRQ_OFFSET);
245 irqnr &= ACTIVEIRQ_MASK;
248 irqnr = irq_find_mapping(domain, irqnr);
249 handle_IRQ(irqnr, regs);
254 asmlinkage void __exception_irq_entry omap2_intc_handle_irq(struct pt_regs *regs)
256 void __iomem *base_addr = OMAP2_IRQ_BASE;
257 omap_intc_handle_irq(base_addr, regs);
260 int __init omap_intc_of_init(struct device_node *node,
261 struct device_node *parent)
269 if (of_address_to_resource(node, 0, &res)) {
270 WARN(1, "unable to get intc registers\n");
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);
277 omap_init_irq(res.start, nr_irqs, of_node_get(node));
282 #ifdef CONFIG_ARCH_OMAP3
283 static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)];
285 void omap_intc_save_context(void)
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] =
300 intc_bank_read_reg(bank, (0x100 + 0x4*i));
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 +
308 void omap_intc_restore_context(void)
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,
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],
326 bank, (0x100 + 0x4*i));
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));
331 /* MIRs are saved and restore with other PRCM registers */
334 void omap3_intc_suspend(void)
336 /* A pending interrupt would prevent OMAP from entering suspend */
340 void omap3_intc_prepare_idle(void)
343 * Disable autoidle as it can stall interrupt controller,
344 * cf. errata ID i540 for 3430 (all revisions up to 3.1.x)
346 intc_bank_write_reg(0, &irq_banks[0], INTC_SYSCONFIG);
349 void omap3_intc_resume_idle(void)
351 /* Re-enable autoidle */
352 intc_bank_write_reg(1, &irq_banks[0], INTC_SYSCONFIG);
355 asmlinkage void __exception_irq_entry omap3_intc_handle_irq(struct pt_regs *regs)
357 void __iomem *base_addr = OMAP3_IRQ_BASE;
358 omap_intc_handle_irq(base_addr, regs);
360 #endif /* CONFIG_ARCH_OMAP3 */