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/init.h>
15 #include <linux/interrupt.h>
17 #include <mach/hardware.h>
18 #include <asm/mach/irq.h>
21 /* selected INTC register offsets */
23 #define INTC_REVISION 0x0000
24 #define INTC_SYSCONFIG 0x0010
25 #define INTC_SYSSTATUS 0x0014
26 #define INTC_SIR 0x0040
27 #define INTC_CONTROL 0x0048
28 #define INTC_PROTECTION 0x004C
29 #define INTC_IDLE 0x0050
30 #define INTC_THRESHOLD 0x0068
31 #define INTC_MIR0 0x0084
32 #define INTC_MIR_CLEAR0 0x0088
33 #define INTC_MIR_SET0 0x008c
34 #define INTC_PENDING_IRQ0 0x0098
35 /* Number of IRQ state bits in each MIR register */
36 #define IRQ_BITS_PER_REG 32
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.
44 static struct omap_irq_bank {
45 void __iomem *base_reg;
47 } __attribute__ ((aligned(4))) irq_banks[] = {
54 /* Structure to save interrupt controller context */
55 struct omap3_intc_regs {
60 u32 ilr[INTCPS_NR_IRQS];
61 u32 mir[INTCPS_NR_MIR_REGS];
64 static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)];
66 /* INTC bank register get/set */
68 static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg)
70 __raw_writel(val, bank->base_reg + reg);
73 static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg)
75 return __raw_readl(bank->base_reg + reg);
78 static int previous_irq;
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.
85 static int omap_check_spurious(unsigned int irq)
89 sir = intc_bank_read_reg(&irq_banks[0], INTC_SIR);
93 printk(KERN_WARNING "Spurious irq %i: 0x%08x, please flush "
94 "posted write for irq %i\n",
95 irq, sir, previous_irq);
102 /* XXX: FIQ and additional INTC support (only MPU at the moment) */
103 static void omap_ack_irq(struct irq_data *d)
105 intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
108 static void omap_mask_irq(struct irq_data *d)
110 unsigned int irq = d->irq;
111 int offset = irq & (~(IRQ_BITS_PER_REG - 1));
113 if (cpu_is_omap34xx() && !cpu_is_ti816x()) {
117 * INT_34XX_GPT12_IRQ is also the spurious irq. Maybe because
118 * it is the highest irq number?
120 if (irq == INT_34XX_GPT12_IRQ)
121 spurious = omap_check_spurious(irq);
127 irq &= (IRQ_BITS_PER_REG - 1);
129 intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_SET0 + offset);
132 static void omap_unmask_irq(struct irq_data *d)
134 unsigned int irq = d->irq;
135 int offset = irq & (~(IRQ_BITS_PER_REG - 1));
137 irq &= (IRQ_BITS_PER_REG - 1);
139 intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_CLEAR0 + offset);
142 static void omap_mask_ack_irq(struct irq_data *d)
148 static struct irq_chip omap_irq_chip = {
150 .irq_ack = omap_mask_ack_irq,
151 .irq_mask = omap_mask_irq,
152 .irq_unmask = omap_unmask_irq,
155 static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
159 tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff;
160 printk(KERN_INFO "IRQ: Found an INTC at 0x%p "
161 "(revision %ld.%ld) with %d interrupts\n",
162 bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);
164 tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG);
165 tmp |= 1 << 1; /* soft reset */
166 intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG);
168 while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1))
169 /* Wait for reset to complete */;
171 /* Enable autoidle */
172 intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG);
175 int omap_irq_pending(void)
179 for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
180 struct omap_irq_bank *bank = irq_banks + i;
183 for (irq = 0; irq < bank->nr_irqs; irq += 32)
184 if (intc_bank_read_reg(bank, INTC_PENDING_IRQ0 +
191 void __init omap_init_irq(void)
193 unsigned long nr_of_irqs = 0;
194 unsigned int nr_banks = 0;
197 for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
198 unsigned long base = 0;
199 struct omap_irq_bank *bank = irq_banks + i;
201 if (cpu_is_omap24xx())
202 base = OMAP24XX_IC_BASE;
203 else if (cpu_is_omap34xx())
204 base = OMAP34XX_IC_BASE;
211 /* Static mapping, never released */
212 bank->base_reg = ioremap(base, SZ_4K);
213 if (!bank->base_reg) {
214 printk(KERN_ERR "Could not ioremap irq bank%i\n", i);
218 omap_irq_bank_init_one(bank);
220 nr_of_irqs += bank->nr_irqs;
224 printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
225 nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");
227 for (i = 0; i < nr_of_irqs; i++) {
228 set_irq_chip(i, &omap_irq_chip);
229 set_irq_handler(i, handle_level_irq);
230 set_irq_flags(i, IRQF_VALID);
234 #ifdef CONFIG_ARCH_OMAP3
235 void omap_intc_save_context(void)
238 for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
239 struct omap_irq_bank *bank = irq_banks + ind;
240 intc_context[ind].sysconfig =
241 intc_bank_read_reg(bank, INTC_SYSCONFIG);
242 intc_context[ind].protection =
243 intc_bank_read_reg(bank, INTC_PROTECTION);
244 intc_context[ind].idle =
245 intc_bank_read_reg(bank, INTC_IDLE);
246 intc_context[ind].threshold =
247 intc_bank_read_reg(bank, INTC_THRESHOLD);
248 for (i = 0; i < INTCPS_NR_IRQS; i++)
249 intc_context[ind].ilr[i] =
250 intc_bank_read_reg(bank, (0x100 + 0x4*i));
251 for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
252 intc_context[ind].mir[i] =
253 intc_bank_read_reg(&irq_banks[0], INTC_MIR0 +
258 void omap_intc_restore_context(void)
262 for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
263 struct omap_irq_bank *bank = irq_banks + ind;
264 intc_bank_write_reg(intc_context[ind].sysconfig,
265 bank, INTC_SYSCONFIG);
266 intc_bank_write_reg(intc_context[ind].sysconfig,
267 bank, INTC_SYSCONFIG);
268 intc_bank_write_reg(intc_context[ind].protection,
269 bank, INTC_PROTECTION);
270 intc_bank_write_reg(intc_context[ind].idle,
272 intc_bank_write_reg(intc_context[ind].threshold,
273 bank, INTC_THRESHOLD);
274 for (i = 0; i < INTCPS_NR_IRQS; i++)
275 intc_bank_write_reg(intc_context[ind].ilr[i],
276 bank, (0x100 + 0x4*i));
277 for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
278 intc_bank_write_reg(intc_context[ind].mir[i],
279 &irq_banks[0], INTC_MIR0 + (0x20 * i));
281 /* MIRs are saved and restore with other PRCM registers */
284 void omap3_intc_suspend(void)
286 /* A pending interrupt would prevent OMAP from entering suspend */
290 void omap3_intc_prepare_idle(void)
293 * Disable autoidle as it can stall interrupt controller,
294 * cf. errata ID i540 for 3430 (all revisions up to 3.1.x)
296 intc_bank_write_reg(0, &irq_banks[0], INTC_SYSCONFIG);
299 void omap3_intc_resume_idle(void)
301 /* Re-enable autoidle */
302 intc_bank_write_reg(1, &irq_banks[0], INTC_SYSCONFIG);
304 #endif /* CONFIG_ARCH_OMAP3 */