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