1 /*
2 * Based on linux/arch/mips/jmr3927/rbhma3100/irq.c,
3 * linux/arch/mips/tx4927/common/tx4927_irq.c,
4 * linux/arch/mips/tx4938/common/irq.c
5 *
6 * Copyright 2001, 2003-2005 MontaVista Software Inc.
7 * Author: MontaVista Software, Inc.
8 * ahennessy@mvista.com
9 * source@mvista.com
10 * Copyright (C) 2000-2001 Toshiba Corporation
11 *
12 * This file is subject to the terms and conditions of the GNU General Public
13 * License. See the file "COPYING" in the main directory of this archive
14 * for more details.
15 */
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/types.h>
19 #include <linux/irq.h>
20 #include <asm/txx9irq.h>
21
22 struct txx9_irc_reg {
23 u32 cer;
24 u32 cr[2];
25 u32 unused0;
26 u32 ilr[8];
27 u32 unused1[4];
28 u32 imr;
29 u32 unused2[7];
30 u32 scr;
31 u32 unused3[7];
32 u32 ssr;
33 u32 unused4[7];
34 u32 csr;
35 };
36
37 /* IRCER : Int. Control Enable */
38 #define TXx9_IRCER_ICE 0x00000001
39
40 /* IRCR : Int. Control */
41 #define TXx9_IRCR_LOW 0x00000000
42 #define TXx9_IRCR_HIGH 0x00000001
43 #define TXx9_IRCR_DOWN 0x00000002
44 #define TXx9_IRCR_UP 0x00000003
45 #define TXx9_IRCR_EDGE(cr) ((cr) & 0x00000002)
46
47 /* IRSCR : Int. Status Control */
48 #define TXx9_IRSCR_EIClrE 0x00000100
49 #define TXx9_IRSCR_EIClr_MASK 0x0000000f
50
51 /* IRCSR : Int. Current Status */
52 #define TXx9_IRCSR_IF 0x00010000
53 #define TXx9_IRCSR_ILV_MASK 0x00000700
54 #define TXx9_IRCSR_IVL_MASK 0x0000001f
55
56 #define irc_dlevel 0
57 #define irc_elevel 1
58
59 static struct txx9_irc_reg __iomem *txx9_ircptr __read_mostly;
60
61 static struct {
62 unsigned char level;
63 unsigned char mode;
64 } txx9irq[TXx9_MAX_IR] __read_mostly;
65
66 static void txx9_irq_unmask(struct irq_data *d)
67 {
68 unsigned int irq_nr = d->irq - TXX9_IRQ_BASE;
69 u32 __iomem *ilrp = &txx9_ircptr->ilr[(irq_nr % 16 ) / 2];
70 int ofs = irq_nr / 16 * 16 + (irq_nr & 1) * 8;
71
72 __raw_writel((__raw_readl(ilrp) & ~(0xff << ofs))
73 | (txx9irq[irq_nr].level << ofs),
74 ilrp);
75 }
76
77 static inline void txx9_irq_mask(struct irq_data *d)
78 {
79 unsigned int irq_nr = d->irq - TXX9_IRQ_BASE;
80 u32 __iomem *ilrp = &txx9_ircptr->ilr[(irq_nr % 16) / 2];
81 int ofs = irq_nr / 16 * 16 + (irq_nr & 1) * 8;
82
83 __raw_writel((__raw_readl(ilrp) & ~(0xff << ofs))
84 | (irc_dlevel << ofs),
85 ilrp);
86 mmiowb();
87 }
88
89 static void txx9_irq_mask_ack(struct irq_data *d)
90 {
91 unsigned int irq_nr = d->irq - TXX9_IRQ_BASE;
92
93 txx9_irq_mask(d);
94 /* clear edge detection */
95 if (unlikely(TXx9_IRCR_EDGE(txx9irq[irq_nr].mode)))
96 __raw_writel(TXx9_IRSCR_EIClrE | irq_nr, &txx9_ircptr->scr);
97 }
98
99 static int txx9_irq_set_type(struct irq_data *d, unsigned int flow_type)
100 {
101 unsigned int irq_nr = d->irq - TXX9_IRQ_BASE;
102 u32 cr;
103 u32 __iomem *crp;
104 int ofs;
105 int mode;
106
107 if (flow_type & IRQF_TRIGGER_PROBE)
108 return 0;
109 switch (flow_type & IRQF_TRIGGER_MASK) {
110 case IRQF_TRIGGER_RISING: mode = TXx9_IRCR_UP; break;
111 case IRQF_TRIGGER_FALLING: mode = TXx9_IRCR_DOWN; break;
112 case IRQF_TRIGGER_HIGH: mode = TXx9_IRCR_HIGH; break;
113 case IRQF_TRIGGER_LOW: mode = TXx9_IRCR_LOW; break;
114 default:
115 return -EINVAL;
116 }
117 crp = &txx9_ircptr->cr[(unsigned int)irq_nr / 8];
118 cr = __raw_readl(crp);
119 ofs = (irq_nr & (8 - 1)) * 2;
120 cr &= ~(0x3 << ofs);
121 cr |= (mode & 0x3) << ofs;
122 __raw_writel(cr, crp);
123 txx9irq[irq_nr].mode = mode;
124 return 0;
125 }
126
127 static struct irq_chip txx9_irq_chip = {
128 .name = "TXX9",
129 .irq_ack = txx9_irq_mask_ack,
130 .irq_mask = txx9_irq_mask,
131 .irq_mask_ack = txx9_irq_mask_ack,
132 .irq_unmask = txx9_irq_unmask,
133 .irq_set_type = txx9_irq_set_type,
134 };
135
136 void __init txx9_irq_init(unsigned long baseaddr)
137 {
138 int i;
139
140 txx9_ircptr = ioremap(baseaddr, sizeof(struct txx9_irc_reg));
141 for (i = 0; i < TXx9_MAX_IR; i++) {
142 txx9irq[i].level = 4; /* middle level */
143 txx9irq[i].mode = TXx9_IRCR_LOW;
144 irq_set_chip_and_handler(TXX9_IRQ_BASE + i, &txx9_irq_chip,
145 handle_level_irq);
146 }
147
148 /* mask all IRC interrupts */
149 __raw_writel(0, &txx9_ircptr->imr);
150 for (i = 0; i < 8; i++)
151 __raw_writel(0, &txx9_ircptr->ilr[i]);
152 /* setup IRC interrupt mode (Low Active) */
153 for (i = 0; i < 2; i++)
154 __raw_writel(0, &txx9_ircptr->cr[i]);
155 /* enable interrupt control */
156 __raw_writel(TXx9_IRCER_ICE, &txx9_ircptr->cer);
157 __raw_writel(irc_elevel, &txx9_ircptr->imr);
158 }
159
160 int __init txx9_irq_set_pri(int irc_irq, int new_pri)
161 {
162 int old_pri;
163
164 if ((unsigned int)irc_irq >= TXx9_MAX_IR)
165 return 0;
166 old_pri = txx9irq[irc_irq].level;
167 txx9irq[irc_irq].level = new_pri;
168 return old_pri;
169 }
170
171 int txx9_irq(void)
172 {
173 u32 csr = __raw_readl(&txx9_ircptr->csr);
174
175 if (likely(!(csr & TXx9_IRCSR_IF)))
176 return TXX9_IRQ_BASE + (csr & (TXx9_MAX_IR - 1));
177 return -1;
178 }
179
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