1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/sh/boards/se/7724/irq.c
4 *
5 * Copyright (C) 2009 Renesas Solutions Corp.
6 *
7 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
8 *
9 * Based on linux/arch/sh/boards/se/7722/irq.c
10 * Copyright (C) 2007 Nobuhiro Iwamatsu
11 *
12 * Hitachi UL SolutionEngine 7724 Support.
13 */
14 #include <linux/init.h>
15 #include <linux/irq.h>
16 #include <linux/interrupt.h>
17 #include <linux/export.h>
18 #include <linux/topology.h>
19 #include <linux/io.h>
20 #include <linux/err.h>
21 #include <mach-se/mach/se7724.h>
22
23 struct fpga_irq {
24 unsigned long sraddr;
25 unsigned long mraddr;
26 unsigned short mask;
27 unsigned int base;
28 };
29
30 static unsigned int fpga2irq(unsigned int irq)
31 {
32 if (irq >= IRQ0_BASE &&
33 irq <= IRQ0_END)
34 return IRQ0_IRQ;
35 else if (irq >= IRQ1_BASE &&
36 irq <= IRQ1_END)
37 return IRQ1_IRQ;
38 else
39 return IRQ2_IRQ;
40 }
41
42 static struct fpga_irq get_fpga_irq(unsigned int irq)
43 {
44 struct fpga_irq set;
45
46 switch (irq) {
47 case IRQ0_IRQ:
48 set.sraddr = IRQ0_SR;
49 set.mraddr = IRQ0_MR;
50 set.mask = IRQ0_MASK;
51 set.base = IRQ0_BASE;
52 break;
53 case IRQ1_IRQ:
54 set.sraddr = IRQ1_SR;
55 set.mraddr = IRQ1_MR;
56 set.mask = IRQ1_MASK;
57 set.base = IRQ1_BASE;
58 break;
59 default:
60 set.sraddr = IRQ2_SR;
61 set.mraddr = IRQ2_MR;
62 set.mask = IRQ2_MASK;
63 set.base = IRQ2_BASE;
64 break;
65 }
66
67 return set;
68 }
69
70 static void disable_se7724_irq(struct irq_data *data)
71 {
72 unsigned int irq = data->irq;
73 struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
74 unsigned int bit = irq - set.base;
75 __raw_writew(__raw_readw(set.mraddr) | 0x0001 << bit, set.mraddr);
76 }
77
78 static void enable_se7724_irq(struct irq_data *data)
79 {
80 unsigned int irq = data->irq;
81 struct fpga_irq set = get_fpga_irq(fpga2irq(irq));
82 unsigned int bit = irq - set.base;
83 __raw_writew(__raw_readw(set.mraddr) & ~(0x0001 << bit), set.mraddr);
84 }
85
86 static struct irq_chip se7724_irq_chip __read_mostly = {
87 .name = "SE7724-FPGA",
88 .irq_mask = disable_se7724_irq,
89 .irq_unmask = enable_se7724_irq,
90 };
91
92 static void se7724_irq_demux(struct irq_desc *desc)
93 {
94 unsigned int irq = irq_desc_get_irq(desc);
95 struct fpga_irq set = get_fpga_irq(irq);
96 unsigned short intv = __raw_readw(set.sraddr);
97 unsigned int ext_irq = set.base;
98
99 intv &= set.mask;
100
101 for (; intv; intv >>= 1, ext_irq++) {
102 if (!(intv & 1))
103 continue;
104
105 generic_handle_irq(ext_irq);
106 }
107 }
108
109 /*
110 * Initialize IRQ setting
111 */
112 void __init init_se7724_IRQ(void)
113 {
114 int irq_base, i;
115
116 __raw_writew(0xffff, IRQ0_MR); /* mask all */
117 __raw_writew(0xffff, IRQ1_MR); /* mask all */
118 __raw_writew(0xffff, IRQ2_MR); /* mask all */
119 __raw_writew(0x0000, IRQ0_SR); /* clear irq */
120 __raw_writew(0x0000, IRQ1_SR); /* clear irq */
121 __raw_writew(0x0000, IRQ2_SR); /* clear irq */
122 __raw_writew(0x002a, IRQ_MODE); /* set irq type */
123
124 irq_base = irq_alloc_descs(SE7724_FPGA_IRQ_BASE, SE7724_FPGA_IRQ_BASE,
125 SE7724_FPGA_IRQ_NR, numa_node_id());
126 if (IS_ERR_VALUE(irq_base)) {
127 pr_err("%s: failed hooking irqs for FPGA\n", __func__);
128 return;
129 }
130
131 for (i = 0; i < SE7724_FPGA_IRQ_NR; i++)
132 irq_set_chip_and_handler_name(irq_base + i, &se7724_irq_chip,
133 handle_level_irq, "level");
134
135 irq_set_chained_handler(IRQ0_IRQ, se7724_irq_demux);
136 irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);
137
138 irq_set_chained_handler(IRQ1_IRQ, se7724_irq_demux);
139 irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
140
141 irq_set_chained_handler(IRQ2_IRQ, se7724_irq_demux);
142 irq_set_irq_type(IRQ2_IRQ, IRQ_TYPE_LEVEL_LOW);
143 }
144
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