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26a8e96a MF |
1 | /* |
2 | * Xtensa MX interrupt distributor | |
3 | * | |
4 | * Copyright (C) 2002 - 2013 Tensilica, Inc. | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | ||
11 | #include <linux/interrupt.h> | |
12 | #include <linux/irqdomain.h> | |
13 | #include <linux/irq.h> | |
14 | #include <linux/of.h> | |
15 | ||
16 | #include <asm/mxregs.h> | |
17 | ||
18 | #include "irqchip.h" | |
19 | ||
20 | #define HW_IRQ_IPI_COUNT 2 | |
21 | #define HW_IRQ_MX_BASE 2 | |
22 | #define HW_IRQ_EXTERN_BASE 3 | |
23 | ||
24 | static DEFINE_PER_CPU(unsigned int, cached_irq_mask); | |
25 | ||
26 | static int xtensa_mx_irq_map(struct irq_domain *d, unsigned int irq, | |
27 | irq_hw_number_t hw) | |
28 | { | |
29 | if (hw < HW_IRQ_IPI_COUNT) { | |
30 | struct irq_chip *irq_chip = d->host_data; | |
31 | irq_set_chip_and_handler_name(irq, irq_chip, | |
32 | handle_percpu_irq, "ipi"); | |
33 | irq_set_status_flags(irq, IRQ_LEVEL); | |
34 | return 0; | |
35 | } | |
36 | return xtensa_irq_map(d, irq, hw); | |
37 | } | |
38 | ||
39 | /* | |
40 | * Device Tree IRQ specifier translation function which works with one or | |
41 | * two cell bindings. First cell value maps directly to the hwirq number. | |
42 | * Second cell if present specifies whether hwirq number is external (1) or | |
43 | * internal (0). | |
44 | */ | |
45 | static int xtensa_mx_irq_domain_xlate(struct irq_domain *d, | |
46 | struct device_node *ctrlr, | |
47 | const u32 *intspec, unsigned int intsize, | |
48 | unsigned long *out_hwirq, unsigned int *out_type) | |
49 | { | |
50 | return xtensa_irq_domain_xlate(intspec, intsize, | |
51 | intspec[0], intspec[0] + HW_IRQ_EXTERN_BASE, | |
52 | out_hwirq, out_type); | |
53 | } | |
54 | ||
55 | static const struct irq_domain_ops xtensa_mx_irq_domain_ops = { | |
56 | .xlate = xtensa_mx_irq_domain_xlate, | |
57 | .map = xtensa_mx_irq_map, | |
58 | }; | |
59 | ||
60 | void secondary_init_irq(void) | |
61 | { | |
62 | __this_cpu_write(cached_irq_mask, | |
63 | XCHAL_INTTYPE_MASK_EXTERN_EDGE | | |
64 | XCHAL_INTTYPE_MASK_EXTERN_LEVEL); | |
65 | set_sr(XCHAL_INTTYPE_MASK_EXTERN_EDGE | | |
66 | XCHAL_INTTYPE_MASK_EXTERN_LEVEL, intenable); | |
67 | } | |
68 | ||
69 | static void xtensa_mx_irq_mask(struct irq_data *d) | |
70 | { | |
71 | unsigned int mask = 1u << d->hwirq; | |
72 | ||
73 | if (mask & (XCHAL_INTTYPE_MASK_EXTERN_EDGE | | |
74 | XCHAL_INTTYPE_MASK_EXTERN_LEVEL)) { | |
75 | set_er(1u << (xtensa_get_ext_irq_no(d->hwirq) - | |
76 | HW_IRQ_MX_BASE), MIENG); | |
77 | } else { | |
78 | mask = __this_cpu_read(cached_irq_mask) & ~mask; | |
79 | __this_cpu_write(cached_irq_mask, mask); | |
80 | set_sr(mask, intenable); | |
81 | } | |
82 | } | |
83 | ||
84 | static void xtensa_mx_irq_unmask(struct irq_data *d) | |
85 | { | |
86 | unsigned int mask = 1u << d->hwirq; | |
87 | ||
88 | if (mask & (XCHAL_INTTYPE_MASK_EXTERN_EDGE | | |
89 | XCHAL_INTTYPE_MASK_EXTERN_LEVEL)) { | |
90 | set_er(1u << (xtensa_get_ext_irq_no(d->hwirq) - | |
91 | HW_IRQ_MX_BASE), MIENGSET); | |
92 | } else { | |
93 | mask |= __this_cpu_read(cached_irq_mask); | |
94 | __this_cpu_write(cached_irq_mask, mask); | |
95 | set_sr(mask, intenable); | |
96 | } | |
97 | } | |
98 | ||
99 | static void xtensa_mx_irq_enable(struct irq_data *d) | |
100 | { | |
101 | variant_irq_enable(d->hwirq); | |
102 | xtensa_mx_irq_unmask(d); | |
103 | } | |
104 | ||
105 | static void xtensa_mx_irq_disable(struct irq_data *d) | |
106 | { | |
107 | xtensa_mx_irq_mask(d); | |
108 | variant_irq_disable(d->hwirq); | |
109 | } | |
110 | ||
111 | static void xtensa_mx_irq_ack(struct irq_data *d) | |
112 | { | |
113 | set_sr(1 << d->hwirq, intclear); | |
114 | } | |
115 | ||
116 | static int xtensa_mx_irq_retrigger(struct irq_data *d) | |
117 | { | |
118 | set_sr(1 << d->hwirq, intset); | |
119 | return 1; | |
120 | } | |
121 | ||
122 | static int xtensa_mx_irq_set_affinity(struct irq_data *d, | |
123 | const struct cpumask *dest, bool force) | |
124 | { | |
125 | unsigned mask = 1u << cpumask_any(dest); | |
126 | ||
127 | set_er(mask, MIROUT(d->hwirq - HW_IRQ_MX_BASE)); | |
128 | return 0; | |
129 | ||
130 | } | |
131 | ||
132 | static struct irq_chip xtensa_mx_irq_chip = { | |
133 | .name = "xtensa-mx", | |
134 | .irq_enable = xtensa_mx_irq_enable, | |
135 | .irq_disable = xtensa_mx_irq_disable, | |
136 | .irq_mask = xtensa_mx_irq_mask, | |
137 | .irq_unmask = xtensa_mx_irq_unmask, | |
138 | .irq_ack = xtensa_mx_irq_ack, | |
139 | .irq_retrigger = xtensa_mx_irq_retrigger, | |
140 | .irq_set_affinity = xtensa_mx_irq_set_affinity, | |
141 | }; | |
142 | ||
143 | int __init xtensa_mx_init_legacy(struct device_node *interrupt_parent) | |
144 | { | |
145 | struct irq_domain *root_domain = | |
146 | irq_domain_add_legacy(NULL, NR_IRQS, 0, 0, | |
147 | &xtensa_mx_irq_domain_ops, | |
148 | &xtensa_mx_irq_chip); | |
149 | irq_set_default_host(root_domain); | |
150 | secondary_init_irq(); | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static int __init xtensa_mx_init(struct device_node *np, | |
155 | struct device_node *interrupt_parent) | |
156 | { | |
157 | struct irq_domain *root_domain = | |
158 | irq_domain_add_linear(np, NR_IRQS, &xtensa_mx_irq_domain_ops, | |
159 | &xtensa_mx_irq_chip); | |
160 | irq_set_default_host(root_domain); | |
161 | secondary_init_irq(); | |
162 | return 0; | |
163 | } | |
164 | IRQCHIP_DECLARE(xtensa_mx_irq_chip, "cdns,xtensa-mx", xtensa_mx_init); |