xref: /linux/arch/arm/mach-pxa/irq.c (revision f7018c21350204c4cf628462f229d44d03545254) 
1 /*
2  *  linux/arch/arm/mach-pxa/irq.c
3  *
4  *  Generic PXA IRQ handling
5  *
6  *  Author:	Nicolas Pitre
7  *  Created:	Jun 15, 2001
8  *  Copyright:	MontaVista Software Inc.
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License version 2 as
12  *  published by the Free Software Foundation.
13  */
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/interrupt.h>
17 #include <linux/syscore_ops.h>
18 #include <linux/io.h>
19 #include <linux/irq.h>
20 #include <linux/of_address.h>
21 #include <linux/of_irq.h>
22 
23 #include <asm/exception.h>
24 
25 #include <mach/hardware.h>
26 #include <mach/irqs.h>
27 
28 #include "generic.h"
29 
30 #define ICIP			(0x000)
31 #define ICMR			(0x004)
32 #define ICLR			(0x008)
33 #define ICFR			(0x00c)
34 #define ICPR			(0x010)
35 #define ICCR			(0x014)
36 #define ICHP			(0x018)
37 #define IPR(i)			(((i) < 32) ? (0x01c + ((i) << 2)) :		\
38 				((i) < 64) ? (0x0b0 + (((i) - 32) << 2)) :	\
39 				      (0x144 + (((i) - 64) << 2)))
40 #define ICHP_VAL_IRQ		(1 << 31)
41 #define ICHP_IRQ(i)		(((i) >> 16) & 0x7fff)
42 #define IPR_VALID		(1 << 31)
43 #define IRQ_BIT(n)		(((n) - PXA_IRQ(0)) & 0x1f)
44 
45 #define MAX_INTERNAL_IRQS	128
46 
47 /*
48  * This is for peripheral IRQs internal to the PXA chip.
49  */
50 
51 static void __iomem *pxa_irq_base;
52 static int pxa_internal_irq_nr;
53 static bool cpu_has_ipr;
54 
55 static inline void __iomem *irq_base(int i)
56 {
57 	static unsigned long phys_base_offset[] = {
58 		0x0,
59 		0x9c,
60 		0x130,
61 	};
62 
63 	return pxa_irq_base + phys_base_offset[i];
64 }
65 
66 void pxa_mask_irq(struct irq_data *d)
67 {
68 	void __iomem *base = irq_data_get_irq_chip_data(d);
69 	uint32_t icmr = __raw_readl(base + ICMR);
70 
71 	icmr &= ~(1 << IRQ_BIT(d->irq));
72 	__raw_writel(icmr, base + ICMR);
73 }
74 
75 void pxa_unmask_irq(struct irq_data *d)
76 {
77 	void __iomem *base = irq_data_get_irq_chip_data(d);
78 	uint32_t icmr = __raw_readl(base + ICMR);
79 
80 	icmr |= 1 << IRQ_BIT(d->irq);
81 	__raw_writel(icmr, base + ICMR);
82 }
83 
84 static struct irq_chip pxa_internal_irq_chip = {
85 	.name		= "SC",
86 	.irq_ack	= pxa_mask_irq,
87 	.irq_mask	= pxa_mask_irq,
88 	.irq_unmask	= pxa_unmask_irq,
89 };
90 
91 asmlinkage void __exception_irq_entry icip_handle_irq(struct pt_regs *regs)
92 {
93 	uint32_t icip, icmr, mask;
94 
95 	do {
96 		icip = __raw_readl(pxa_irq_base + ICIP);
97 		icmr = __raw_readl(pxa_irq_base + ICMR);
98 		mask = icip & icmr;
99 
100 		if (mask == 0)
101 			break;
102 
103 		handle_IRQ(PXA_IRQ(fls(mask) - 1), regs);
104 	} while (1);
105 }
106 
107 asmlinkage void __exception_irq_entry ichp_handle_irq(struct pt_regs *regs)
108 {
109 	uint32_t ichp;
110 
111 	do {
112 		__asm__ __volatile__("mrc p6, 0, %0, c5, c0, 0\n": "=r"(ichp));
113 
114 		if ((ichp & ICHP_VAL_IRQ) == 0)
115 			break;
116 
117 		handle_IRQ(PXA_IRQ(ICHP_IRQ(ichp)), regs);
118 	} while (1);
119 }
120 
121 void __init pxa_init_irq(int irq_nr, int (*fn)(struct irq_data *, unsigned int))
122 {
123 	int irq, i, n;
124 
125 	BUG_ON(irq_nr > MAX_INTERNAL_IRQS);
126 
127 	pxa_internal_irq_nr = irq_nr;
128 	cpu_has_ipr = !cpu_is_pxa25x();
129 	pxa_irq_base = io_p2v(0x40d00000);
130 
131 	for (n = 0; n < irq_nr; n += 32) {
132 		void __iomem *base = irq_base(n >> 5);
133 
134 		__raw_writel(0, base + ICMR);	/* disable all IRQs */
135 		__raw_writel(0, base + ICLR);	/* all IRQs are IRQ, not FIQ */
136 		for (i = n; (i < (n + 32)) && (i < irq_nr); i++) {
137 			/* initialize interrupt priority */
138 			if (cpu_has_ipr)
139 				__raw_writel(i | IPR_VALID, pxa_irq_base + IPR(i));
140 
141 			irq = PXA_IRQ(i);
142 			irq_set_chip_and_handler(irq, &pxa_internal_irq_chip,
143 						 handle_level_irq);
144 			irq_set_chip_data(irq, base);
145 			set_irq_flags(irq, IRQF_VALID);
146 		}
147 	}
148 
149 	/* only unmasked interrupts kick us out of idle */
150 	__raw_writel(1, irq_base(0) + ICCR);
151 
152 	pxa_internal_irq_chip.irq_set_wake = fn;
153 }
154 
155 #ifdef CONFIG_PM
156 static unsigned long saved_icmr[MAX_INTERNAL_IRQS/32];
157 static unsigned long saved_ipr[MAX_INTERNAL_IRQS];
158 
159 static int pxa_irq_suspend(void)
160 {
161 	int i;
162 
163 	for (i = 0; i < pxa_internal_irq_nr / 32; i++) {
164 		void __iomem *base = irq_base(i);
165 
166 		saved_icmr[i] = __raw_readl(base + ICMR);
167 		__raw_writel(0, base + ICMR);
168 	}
169 
170 	if (cpu_has_ipr) {
171 		for (i = 0; i < pxa_internal_irq_nr; i++)
172 			saved_ipr[i] = __raw_readl(pxa_irq_base + IPR(i));
173 	}
174 
175 	return 0;
176 }
177 
178 static void pxa_irq_resume(void)
179 {
180 	int i;
181 
182 	for (i = 0; i < pxa_internal_irq_nr / 32; i++) {
183 		void __iomem *base = irq_base(i);
184 
185 		__raw_writel(saved_icmr[i], base + ICMR);
186 		__raw_writel(0, base + ICLR);
187 	}
188 
189 	if (cpu_has_ipr)
190 		for (i = 0; i < pxa_internal_irq_nr; i++)
191 			__raw_writel(saved_ipr[i], pxa_irq_base + IPR(i));
192 
193 	__raw_writel(1, pxa_irq_base + ICCR);
194 }
195 #else
196 #define pxa_irq_suspend		NULL
197 #define pxa_irq_resume		NULL
198 #endif
199 
200 struct syscore_ops pxa_irq_syscore_ops = {
201 	.suspend	= pxa_irq_suspend,
202 	.resume		= pxa_irq_resume,
203 };
204 
205 #ifdef CONFIG_OF
206 static struct irq_domain *pxa_irq_domain;
207 
208 static int pxa_irq_map(struct irq_domain *h, unsigned int virq,
209 		       irq_hw_number_t hw)
210 {
211 	void __iomem *base = irq_base(hw / 32);
212 
213 	/* initialize interrupt priority */
214 	if (cpu_has_ipr)
215 		__raw_writel(hw | IPR_VALID, pxa_irq_base + IPR(hw));
216 
217 	irq_set_chip_and_handler(hw, &pxa_internal_irq_chip,
218 				 handle_level_irq);
219 	irq_set_chip_data(hw, base);
220 	set_irq_flags(hw, IRQF_VALID);
221 
222 	return 0;
223 }
224 
225 static struct irq_domain_ops pxa_irq_ops = {
226 	.map    = pxa_irq_map,
227 	.xlate  = irq_domain_xlate_onecell,
228 };
229 
230 static const struct of_device_id intc_ids[] __initconst = {
231 	{ .compatible = "marvell,pxa-intc", },
232 	{}
233 };
234 
235 void __init pxa_dt_irq_init(int (*fn)(struct irq_data *, unsigned int))
236 {
237 	struct device_node *node;
238 	struct resource res;
239 	int n, ret;
240 
241 	node = of_find_matching_node(NULL, intc_ids);
242 	if (!node) {
243 		pr_err("Failed to find interrupt controller in arch-pxa\n");
244 		return;
245 	}
246 
247 	ret = of_property_read_u32(node, "marvell,intc-nr-irqs",
248 				   &pxa_internal_irq_nr);
249 	if (ret) {
250 		pr_err("Not found marvell,intc-nr-irqs property\n");
251 		return;
252 	}
253 
254 	ret = of_address_to_resource(node, 0, &res);
255 	if (ret < 0) {
256 		pr_err("No registers defined for node\n");
257 		return;
258 	}
259 	pxa_irq_base = io_p2v(res.start);
260 
261 	if (of_find_property(node, "marvell,intc-priority", NULL))
262 		cpu_has_ipr = 1;
263 
264 	ret = irq_alloc_descs(-1, 0, pxa_internal_irq_nr, 0);
265 	if (ret < 0) {
266 		pr_err("Failed to allocate IRQ numbers\n");
267 		return;
268 	}
269 
270 	pxa_irq_domain = irq_domain_add_legacy(node, pxa_internal_irq_nr, 0, 0,
271 					       &pxa_irq_ops, NULL);
272 	if (!pxa_irq_domain)
273 		panic("Unable to add PXA IRQ domain\n");
274 
275 	irq_set_default_host(pxa_irq_domain);
276 
277 	for (n = 0; n < pxa_internal_irq_nr; n += 32) {
278 		void __iomem *base = irq_base(n >> 5);
279 
280 		__raw_writel(0, base + ICMR);	/* disable all IRQs */
281 		__raw_writel(0, base + ICLR);	/* all IRQs are IRQ, not FIQ */
282 	}
283 
284 	/* only unmasked interrupts kick us out of idle */
285 	__raw_writel(1, irq_base(0) + ICCR);
286 
287 	pxa_internal_irq_chip.irq_set_wake = fn;
288 }
289 #endif /* CONFIG_OF */
290