1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/arm/mach-pxa/irq.c
4 *
5 * Generic PXA IRQ handling
6 *
7 * Author: Nicolas Pitre
8 * Created: Jun 15, 2001
9 * Copyright: MontaVista Software Inc.
10 */
11 #include <linux/bitops.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/syscore_ops.h>
16 #include <linux/io.h>
17 #include <linux/irq.h>
18 #include <linux/of_address.h>
19 #include <linux/of_irq.h>
20 #include <linux/soc/pxa/cpu.h>
21
22 #include <asm/exception.h>
23
24 #include "irqs.h"
25
26 #include "generic.h"
27 #include "pxa-regs.h"
28
29 #define ICIP (0x000)
30 #define ICMR (0x004)
31 #define ICLR (0x008)
32 #define ICFR (0x00c)
33 #define ICPR (0x010)
34 #define ICCR (0x014)
35 #define ICHP (0x018)
36 #define IPR(i) (((i) < 32) ? (0x01c + ((i) << 2)) : \
37 ((i) < 64) ? (0x0b0 + (((i) - 32) << 2)) : \
38 (0x144 + (((i) - 64) << 2)))
39 #define ICHP_VAL_IRQ (1 << 31)
40 #define ICHP_IRQ(i) (((i) >> 16) & 0x7fff)
41 #define IPR_VALID (1 << 31)
42
43 #define MAX_INTERNAL_IRQS 128
44
45 /*
46 * This is for peripheral IRQs internal to the PXA chip.
47 */
48
49 static void __iomem *pxa_irq_base;
50 static int pxa_internal_irq_nr;
51 static bool cpu_has_ipr;
52 static struct irq_domain *pxa_irq_domain;
53
54 static inline void __iomem *irq_base(int i)
55 {
56 static unsigned long phys_base_offset[] = {
57 0x0,
58 0x9c,
59 0x130,
60 };
61
62 return pxa_irq_base + phys_base_offset[i];
63 }
64
65 void pxa_mask_irq(struct irq_data *d)
66 {
67 void __iomem *base = irq_data_get_irq_chip_data(d);
68 irq_hw_number_t irq = irqd_to_hwirq(d);
69 uint32_t icmr = __raw_readl(base + ICMR);
70
71 icmr &= ~BIT(irq & 0x1f);
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 irq_hw_number_t irq = irqd_to_hwirq(d);
79 uint32_t icmr = __raw_readl(base + ICMR);
80
81 icmr |= BIT(irq & 0x1f);
82 __raw_writel(icmr, base + ICMR);
83 }
84
85 static struct irq_chip pxa_internal_irq_chip = {
86 .name = "SC",
87 .irq_ack = pxa_mask_irq,
88 .irq_mask = pxa_mask_irq,
89 .irq_unmask = pxa_unmask_irq,
90 };
91
92 asmlinkage void __exception_irq_entry icip_handle_irq(struct pt_regs *regs)
93 {
94 uint32_t icip, icmr, mask;
95
96 do {
97 icip = __raw_readl(pxa_irq_base + ICIP);
98 icmr = __raw_readl(pxa_irq_base + ICMR);
99 mask = icip & icmr;
100
101 if (mask == 0)
102 break;
103
104 handle_IRQ(PXA_IRQ(fls(mask) - 1), regs);
105 } while (1);
106 }
107
108 asmlinkage void __exception_irq_entry ichp_handle_irq(struct pt_regs *regs)
109 {
110 uint32_t ichp;
111
112 do {
113 __asm__ __volatile__("mrc p6, 0, %0, c5, c0, 0\n": "=r"(ichp));
114
115 if ((ichp & ICHP_VAL_IRQ) == 0)
116 break;
117
118 handle_IRQ(PXA_IRQ(ICHP_IRQ(ichp)), regs);
119 } while (1);
120 }
121
122 static int pxa_irq_map(struct irq_domain *h, unsigned int virq,
123 irq_hw_number_t hw)
124 {
125 void __iomem *base = irq_base(hw / 32);
126
127 /* initialize interrupt priority */
128 if (cpu_has_ipr)
129 __raw_writel(hw | IPR_VALID, pxa_irq_base + IPR(hw));
130
131 irq_set_chip_and_handler(virq, &pxa_internal_irq_chip,
132 handle_level_irq);
133 irq_set_chip_data(virq, base);
134
135 return 0;
136 }
137
138 static const struct irq_domain_ops pxa_irq_ops = {
139 .map = pxa_irq_map,
140 .xlate = irq_domain_xlate_onecell,
141 };
142
143 static __init void
144 pxa_init_irq_common(struct device_node *node, int irq_nr,
145 int (*fn)(struct irq_data *, unsigned int))
146 {
147 int n;
148
149 pxa_internal_irq_nr = irq_nr;
150 pxa_irq_domain = irq_domain_add_legacy(node, irq_nr,
151 PXA_IRQ(0), 0,
152 &pxa_irq_ops, NULL);
153 if (!pxa_irq_domain)
154 panic("Unable to add PXA IRQ domain\n");
155 irq_set_default_host(pxa_irq_domain);
156
157 for (n = 0; n < irq_nr; n += 32) {
158 void __iomem *base = irq_base(n >> 5);
159
160 __raw_writel(0, base + ICMR); /* disable all IRQs */
161 __raw_writel(0, base + ICLR); /* all IRQs are IRQ, not FIQ */
162 }
163 /* only unmasked interrupts kick us out of idle */
164 __raw_writel(1, irq_base(0) + ICCR);
165
166 pxa_internal_irq_chip.irq_set_wake = fn;
167 }
168
169 void __init pxa_init_irq(int irq_nr, int (*fn)(struct irq_data *, unsigned int))
170 {
171 BUG_ON(irq_nr > MAX_INTERNAL_IRQS);
172
173 pxa_irq_base = io_p2v(0x40d00000);
174 cpu_has_ipr = !cpu_is_pxa25x();
175 pxa_init_irq_common(NULL, irq_nr, fn);
176 }
177
178 #ifdef CONFIG_PM
179 static unsigned long saved_icmr[MAX_INTERNAL_IRQS/32];
180 static unsigned long saved_ipr[MAX_INTERNAL_IRQS];
181
182 static int pxa_irq_suspend(void)
183 {
184 int i;
185
186 for (i = 0; i < DIV_ROUND_UP(pxa_internal_irq_nr, 32); i++) {
187 void __iomem *base = irq_base(i);
188
189 saved_icmr[i] = __raw_readl(base + ICMR);
190 __raw_writel(0, base + ICMR);
191 }
192
193 if (cpu_has_ipr) {
194 for (i = 0; i < pxa_internal_irq_nr; i++)
195 saved_ipr[i] = __raw_readl(pxa_irq_base + IPR(i));
196 }
197
198 return 0;
199 }
200
201 static void pxa_irq_resume(void)
202 {
203 int i;
204
205 for (i = 0; i < DIV_ROUND_UP(pxa_internal_irq_nr, 32); i++) {
206 void __iomem *base = irq_base(i);
207
208 __raw_writel(saved_icmr[i], base + ICMR);
209 __raw_writel(0, base + ICLR);
210 }
211
212 if (cpu_has_ipr)
213 for (i = 0; i < pxa_internal_irq_nr; i++)
214 __raw_writel(saved_ipr[i], pxa_irq_base + IPR(i));
215
216 __raw_writel(1, pxa_irq_base + ICCR);
217 }
218 #else
219 #define pxa_irq_suspend NULL
220 #define pxa_irq_resume NULL
221 #endif
222
223 struct syscore_ops pxa_irq_syscore_ops = {
224 .suspend = pxa_irq_suspend,
225 .resume = pxa_irq_resume,
226 };
227
228 #ifdef CONFIG_OF
229 static const struct of_device_id intc_ids[] __initconst = {
230 { .compatible = "marvell,pxa-intc", },
231 {}
232 };
233
234 void __init pxa_dt_irq_init(int (*fn)(struct irq_data *, unsigned int))
235 {
236 struct device_node *node;
237 struct resource res;
238 int ret;
239
240 node = of_find_matching_node(NULL, intc_ids);
241 if (!node) {
242 pr_err("Failed to find interrupt controller in arch-pxa\n");
243 return;
244 }
245
246 ret = of_property_read_u32(node, "marvell,intc-nr-irqs",
247 &pxa_internal_irq_nr);
248 if (ret) {
249 pr_err("Not found marvell,intc-nr-irqs property\n");
250 return;
251 }
252
253 ret = of_address_to_resource(node, 0, &res);
254 if (ret < 0) {
255 pr_err("No registers defined for node\n");
256 return;
257 }
258 pxa_irq_base = io_p2v(res.start);
259
260 cpu_has_ipr = of_property_read_bool(node, "marvell,intc-priority");
261
262 ret = irq_alloc_descs(-1, 0, pxa_internal_irq_nr, 0);
263 if (ret < 0) {
264 pr_err("Failed to allocate IRQ numbers\n");
265 return;
266 }
267
268 pxa_init_irq_common(node, pxa_internal_irq_nr, fn);
269 }
270 #endif /* CONFIG_OF */
271
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