1 /*
2  * linux/arch/arm/mach-omap1/irq.c
3  *
4  * Interrupt handler for all OMAP boards
5  *
6  * Copyright (C) 2004 Nokia Corporation
7  * Written by Tony Lindgren <tony@atomide.com>
8  * Major cleanups by Juha Yrjölä <juha.yrjola@nokia.com>
9  *
10  * Completely re-written to support various OMAP chips with bank specific
11  * interrupt handlers.
12  *
13  * Some snippets of the code taken from the older OMAP interrupt handler
14  * Copyright (C) 2001 RidgeRun, Inc. Greg Lonnon <glonnon@ridgerun.com>
15  *
16  * GPIO interrupt handler moved to gpio.c by Juha Yrjola
17  *
18  * This program is free software; you can redistribute it and/or modify it
19  * under the terms of the GNU General Public License as published by the
20  * Free Software Foundation; either version 2 of the License, or (at your
21  * option) any later version.
22  *
23  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
26  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
29  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
30  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33  *
34  * You should have received a copy of the  GNU General Public License along
35  * with this program; if not, write  to the Free Software Foundation, Inc.,
36  * 675 Mass Ave, Cambridge, MA 02139, USA.
37  */
38 #include <linux/gpio.h>
39 #include <linux/init.h>
40 #include <linux/module.h>
41 #include <linux/sched.h>
42 #include <linux/interrupt.h>
43 #include <linux/io.h>
44 
45 #include <asm/irq.h>
46 #include <asm/exception.h>
47 #include <asm/mach/irq.h>
48 
49 #include "soc.h"
50 #include "hardware.h"
51 #include "common.h"
52 
53 #define IRQ_BANK(irq) ((irq) >> 5)
54 #define IRQ_BIT(irq)  ((irq) & 0x1f)
55 
56 struct omap_irq_bank {
57 	unsigned long base_reg;
58 	void __iomem *va;
59 	unsigned long trigger_map;
60 	unsigned long wake_enable;
61 };
62 
63 static u32 omap_l2_irq;
64 static unsigned int irq_bank_count;
65 static struct omap_irq_bank *irq_banks;
66 static struct irq_domain *domain;
67 
irq_bank_readl(int bank,int offset)68 static inline unsigned int irq_bank_readl(int bank, int offset)
69 {
70 	return readl_relaxed(irq_banks[bank].va + offset);
71 }
irq_bank_writel(unsigned long value,int bank,int offset)72 static inline void irq_bank_writel(unsigned long value, int bank, int offset)
73 {
74 	writel_relaxed(value, irq_banks[bank].va + offset);
75 }
76 
omap_ack_irq(int irq)77 static void omap_ack_irq(int irq)
78 {
79 	if (irq > 31)
80 		writel_relaxed(0x1, irq_banks[1].va + IRQ_CONTROL_REG_OFFSET);
81 
82 	writel_relaxed(0x1, irq_banks[0].va + IRQ_CONTROL_REG_OFFSET);
83 }
84 
omap_mask_ack_irq(struct irq_data * d)85 static void omap_mask_ack_irq(struct irq_data *d)
86 {
87 	struct irq_chip_type *ct = irq_data_get_chip_type(d);
88 
89 	ct->chip.irq_mask(d);
90 	omap_ack_irq(d->irq);
91 }
92 
93 /*
94  * Allows tuning the IRQ type and priority
95  *
96  * NOTE: There is currently no OMAP fiq handler for Linux. Read the
97  *	 mailing list threads on FIQ handlers if you are planning to
98  *	 add a FIQ handler for OMAP.
99  */
omap_irq_set_cfg(int irq,int fiq,int priority,int trigger)100 static void omap_irq_set_cfg(int irq, int fiq, int priority, int trigger)
101 {
102 	signed int bank;
103 	unsigned long val, offset;
104 
105 	bank = IRQ_BANK(irq);
106 	/* FIQ is only available on bank 0 interrupts */
107 	fiq = bank ? 0 : (fiq & 0x1);
108 	val = fiq | ((priority & 0x1f) << 2) | ((trigger & 0x1) << 1);
109 	offset = IRQ_ILR0_REG_OFFSET + IRQ_BIT(irq) * 0x4;
110 	irq_bank_writel(val, bank, offset);
111 }
112 
113 #if defined (CONFIG_ARCH_OMAP730) || defined (CONFIG_ARCH_OMAP850)
114 static struct omap_irq_bank omap7xx_irq_banks[] = {
115 	{ .base_reg = OMAP_IH1_BASE,		.trigger_map = 0xb3f8e22f },
116 	{ .base_reg = OMAP_IH2_BASE,		.trigger_map = 0xfdb9c1f2 },
117 	{ .base_reg = OMAP_IH2_BASE + 0x100,	.trigger_map = 0x800040f3 },
118 };
119 #endif
120 
121 #ifdef CONFIG_ARCH_OMAP15XX
122 static struct omap_irq_bank omap1510_irq_banks[] = {
123 	{ .base_reg = OMAP_IH1_BASE,		.trigger_map = 0xb3febfff },
124 	{ .base_reg = OMAP_IH2_BASE,		.trigger_map = 0xffbfffed },
125 };
126 static struct omap_irq_bank omap310_irq_banks[] = {
127 	{ .base_reg = OMAP_IH1_BASE,		.trigger_map = 0xb3faefc3 },
128 	{ .base_reg = OMAP_IH2_BASE,		.trigger_map = 0x65b3c061 },
129 };
130 #endif
131 
132 #if defined(CONFIG_ARCH_OMAP16XX)
133 
134 static struct omap_irq_bank omap1610_irq_banks[] = {
135 	{ .base_reg = OMAP_IH1_BASE,		.trigger_map = 0xb3fefe8f },
136 	{ .base_reg = OMAP_IH2_BASE,		.trigger_map = 0xfdb7c1fd },
137 	{ .base_reg = OMAP_IH2_BASE + 0x100,	.trigger_map = 0xffffb7ff },
138 	{ .base_reg = OMAP_IH2_BASE + 0x200,	.trigger_map = 0xffffffff },
139 };
140 #endif
141 
omap1_handle_irq(struct pt_regs * regs)142 asmlinkage void __exception_irq_entry omap1_handle_irq(struct pt_regs *regs)
143 {
144 	void __iomem *l1 = irq_banks[0].va;
145 	void __iomem *l2 = irq_banks[1].va;
146 	u32 irqnr;
147 
148 	do {
149 		irqnr = readl_relaxed(l1 + IRQ_ITR_REG_OFFSET);
150 		irqnr &= ~(readl_relaxed(l1 + IRQ_MIR_REG_OFFSET) & 0xffffffff);
151 		if (!irqnr)
152 			break;
153 
154 		irqnr = readl_relaxed(l1 + IRQ_SIR_FIQ_REG_OFFSET);
155 		if (irqnr)
156 			goto irq;
157 
158 		irqnr = readl_relaxed(l1 + IRQ_SIR_IRQ_REG_OFFSET);
159 		if (irqnr == omap_l2_irq) {
160 			irqnr = readl_relaxed(l2 + IRQ_SIR_IRQ_REG_OFFSET);
161 			if (irqnr)
162 				irqnr += 32;
163 		}
164 irq:
165 		if (irqnr)
166 			generic_handle_domain_irq(domain, irqnr);
167 		else
168 			break;
169 	} while (irqnr);
170 }
171 
172 static __init void
omap_alloc_gc(void __iomem * base,unsigned int irq_start,unsigned int num)173 omap_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
174 {
175 	struct irq_chip_generic *gc;
176 	struct irq_chip_type *ct;
177 
178 	gc = irq_alloc_generic_chip("MPU", 1, irq_start, base,
179 				    handle_level_irq);
180 	ct = gc->chip_types;
181 	ct->chip.irq_ack = omap_mask_ack_irq;
182 	ct->chip.irq_mask = irq_gc_mask_set_bit;
183 	ct->chip.irq_unmask = irq_gc_mask_clr_bit;
184 	ct->chip.irq_set_wake = irq_gc_set_wake;
185 	ct->regs.mask = IRQ_MIR_REG_OFFSET;
186 	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
187 			       IRQ_NOREQUEST | IRQ_NOPROBE, 0);
188 }
189 
omap1_init_irq(void)190 void __init omap1_init_irq(void)
191 {
192 	struct irq_chip_type *ct;
193 	struct irq_data *d = NULL;
194 	int i, j, irq_base;
195 	unsigned long nr_irqs;
196 
197 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
198 	if (cpu_is_omap7xx()) {
199 		irq_banks = omap7xx_irq_banks;
200 		irq_bank_count = ARRAY_SIZE(omap7xx_irq_banks);
201 	}
202 #endif
203 #ifdef CONFIG_ARCH_OMAP15XX
204 	if (cpu_is_omap1510()) {
205 		irq_banks = omap1510_irq_banks;
206 		irq_bank_count = ARRAY_SIZE(omap1510_irq_banks);
207 	}
208 	if (cpu_is_omap310()) {
209 		irq_banks = omap310_irq_banks;
210 		irq_bank_count = ARRAY_SIZE(omap310_irq_banks);
211 	}
212 #endif
213 #if defined(CONFIG_ARCH_OMAP16XX)
214 	if (cpu_is_omap16xx()) {
215 		irq_banks = omap1610_irq_banks;
216 		irq_bank_count = ARRAY_SIZE(omap1610_irq_banks);
217 	}
218 #endif
219 
220 	for (i = 0; i < irq_bank_count; i++) {
221 		irq_banks[i].va = ioremap(irq_banks[i].base_reg, 0xff);
222 		if (WARN_ON(!irq_banks[i].va))
223 			return;
224 	}
225 
226 	nr_irqs = irq_bank_count * 32;
227 
228 	irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
229 	if (irq_base < 0) {
230 		pr_warn("Couldn't allocate IRQ numbers\n");
231 		irq_base = 0;
232 	}
233 	omap_l2_irq = cpu_is_omap7xx() ? irq_base + 1 : irq_base;
234 	omap_l2_irq -= NR_IRQS_LEGACY;
235 
236 	domain = irq_domain_add_legacy(NULL, nr_irqs, irq_base, 0,
237 				       &irq_domain_simple_ops, NULL);
238 
239 	pr_info("Total of %lu interrupts in %i interrupt banks\n",
240 		nr_irqs, irq_bank_count);
241 
242 	/* Mask and clear all interrupts */
243 	for (i = 0; i < irq_bank_count; i++) {
244 		irq_bank_writel(~0x0, i, IRQ_MIR_REG_OFFSET);
245 		irq_bank_writel(0x0, i, IRQ_ITR_REG_OFFSET);
246 	}
247 
248 	/* Clear any pending interrupts */
249 	irq_bank_writel(0x03, 0, IRQ_CONTROL_REG_OFFSET);
250 	irq_bank_writel(0x03, 1, IRQ_CONTROL_REG_OFFSET);
251 
252 	/* Enable interrupts in global mask */
253 	if (cpu_is_omap7xx())
254 		irq_bank_writel(0x0, 0, IRQ_GMR_REG_OFFSET);
255 
256 	/* Install the interrupt handlers for each bank */
257 	for (i = 0; i < irq_bank_count; i++) {
258 		for (j = i * 32; j < (i + 1) * 32; j++) {
259 			int irq_trigger;
260 
261 			irq_trigger = irq_banks[i].trigger_map >> IRQ_BIT(j);
262 			omap_irq_set_cfg(j, 0, 0, irq_trigger);
263 			irq_clear_status_flags(j, IRQ_NOREQUEST);
264 		}
265 		omap_alloc_gc(irq_banks[i].va, irq_base + i * 32, 32);
266 	}
267 
268 	/* Unmask level 2 handler */
269 	d = irq_get_irq_data(irq_find_mapping(domain, omap_l2_irq));
270 	if (d) {
271 		ct = irq_data_get_chip_type(d);
272 		ct->chip.irq_unmask(d);
273 	}
274 }
275