Merge branches 'core/futexes', 'core/locking', 'core/rcu' and 'linus' into core/urgent
[linux-2.6] / arch / arm / plat-s3c64xx / irq.c
1 /* arch/arm/plat-s3c64xx/irq.c
2  *
3  * Copyright 2008 Openmoko, Inc.
4  * Copyright 2008 Simtec Electronics
5  *      Ben Dooks <ben@simtec.co.uk>
6  *      http://armlinux.simtec.co.uk/
7  *
8  * S3C64XX - Interrupt handling
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
15 #include <linux/kernel.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <linux/io.h>
19
20 #include <asm/hardware/vic.h>
21
22 #include <mach/map.h>
23 #include <plat/regs-timer.h>
24 #include <plat/cpu.h>
25
26 /* Timer interrupt handling */
27
28 static void s3c_irq_demux_timer(unsigned int base_irq, unsigned int sub_irq)
29 {
30         generic_handle_irq(sub_irq);
31 }
32
33 static void s3c_irq_demux_timer0(unsigned int irq, struct irq_desc *desc)
34 {
35         s3c_irq_demux_timer(irq, IRQ_TIMER0);
36 }
37
38 static void s3c_irq_demux_timer1(unsigned int irq, struct irq_desc *desc)
39 {
40         s3c_irq_demux_timer(irq, IRQ_TIMER1);
41 }
42
43 static void s3c_irq_demux_timer2(unsigned int irq, struct irq_desc *desc)
44 {
45         s3c_irq_demux_timer(irq, IRQ_TIMER2);
46 }
47
48 static void s3c_irq_demux_timer3(unsigned int irq, struct irq_desc *desc)
49 {
50         s3c_irq_demux_timer(irq, IRQ_TIMER3);
51 }
52
53 static void s3c_irq_demux_timer4(unsigned int irq, struct irq_desc *desc)
54 {
55         s3c_irq_demux_timer(irq, IRQ_TIMER4);
56 }
57
58 /* We assume the IRQ_TIMER0..IRQ_TIMER4 range is continuous. */
59
60 static void s3c_irq_timer_mask(unsigned int irq)
61 {
62         u32 reg = __raw_readl(S3C64XX_TINT_CSTAT);
63
64         reg &= 0x1f;  /* mask out pending interrupts */
65         reg &= ~(1 << (irq - IRQ_TIMER0));
66         __raw_writel(reg, S3C64XX_TINT_CSTAT);
67 }
68
69 static void s3c_irq_timer_unmask(unsigned int irq)
70 {
71         u32 reg = __raw_readl(S3C64XX_TINT_CSTAT);
72
73         reg &= 0x1f;  /* mask out pending interrupts */
74         reg |= 1 << (irq - IRQ_TIMER0);
75         __raw_writel(reg, S3C64XX_TINT_CSTAT);
76 }
77
78 static void s3c_irq_timer_ack(unsigned int irq)
79 {
80         u32 reg = __raw_readl(S3C64XX_TINT_CSTAT);
81
82         reg &= 0x1f;
83         reg |= (1 << 5) << (irq - IRQ_TIMER0);
84         __raw_writel(reg, S3C64XX_TINT_CSTAT);
85 }
86
87 static struct irq_chip s3c_irq_timer = {
88         .name           = "s3c-timer",
89         .mask           = s3c_irq_timer_mask,
90         .unmask         = s3c_irq_timer_unmask,
91         .ack            = s3c_irq_timer_ack,
92 };
93
94 struct uart_irq {
95         void __iomem    *regs;
96         unsigned int     base_irq;
97         unsigned int     parent_irq;
98 };
99
100 /* Note, we make use of the fact that the parent IRQs, IRQ_UART[0..3]
101  * are consecutive when looking up the interrupt in the demux routines.
102  */
103 static struct uart_irq uart_irqs[] = {
104         [0] = {
105                 .regs           = S3C_VA_UART0,
106                 .base_irq       = IRQ_S3CUART_BASE0,
107                 .parent_irq     = IRQ_UART0,
108         },
109         [1] = {
110                 .regs           = S3C_VA_UART1,
111                 .base_irq       = IRQ_S3CUART_BASE1,
112                 .parent_irq     = IRQ_UART1,
113         },
114         [2] = {
115                 .regs           = S3C_VA_UART2,
116                 .base_irq       = IRQ_S3CUART_BASE2,
117                 .parent_irq     = IRQ_UART2,
118         },
119         [3] = {
120                 .regs           = S3C_VA_UART3,
121                 .base_irq       = IRQ_S3CUART_BASE3,
122                 .parent_irq     = IRQ_UART3,
123         },
124 };
125
126 static inline void __iomem *s3c_irq_uart_base(unsigned int irq)
127 {
128         struct uart_irq *uirq = get_irq_chip_data(irq);
129         return uirq->regs;
130 }
131
132 static inline unsigned int s3c_irq_uart_bit(unsigned int irq)
133 {
134         return irq & 3;
135 }
136
137 /* UART interrupt registers, not worth adding to seperate include header */
138 #define S3C64XX_UINTP   0x30
139 #define S3C64XX_UINTSP  0x34
140 #define S3C64XX_UINTM   0x38
141
142 static void s3c_irq_uart_mask(unsigned int irq)
143 {
144         void __iomem *regs = s3c_irq_uart_base(irq);
145         unsigned int bit = s3c_irq_uart_bit(irq);
146         u32 reg;
147
148         reg = __raw_readl(regs + S3C64XX_UINTM);
149         reg |= (1 << bit);
150         __raw_writel(reg, regs + S3C64XX_UINTM);
151 }
152
153 static void s3c_irq_uart_maskack(unsigned int irq)
154 {
155         void __iomem *regs = s3c_irq_uart_base(irq);
156         unsigned int bit = s3c_irq_uart_bit(irq);
157         u32 reg;
158
159         reg = __raw_readl(regs + S3C64XX_UINTM);
160         reg |= (1 << bit);
161         __raw_writel(reg, regs + S3C64XX_UINTM);
162         __raw_writel(1 << bit, regs + S3C64XX_UINTP);
163 }
164
165 static void s3c_irq_uart_unmask(unsigned int irq)
166 {
167         void __iomem *regs = s3c_irq_uart_base(irq);
168         unsigned int bit = s3c_irq_uart_bit(irq);
169         u32 reg;
170
171         reg = __raw_readl(regs + S3C64XX_UINTM);
172         reg &= ~(1 << bit);
173         __raw_writel(reg, regs + S3C64XX_UINTM);
174 }
175
176 static void s3c_irq_uart_ack(unsigned int irq)
177 {
178         void __iomem *regs = s3c_irq_uart_base(irq);
179         unsigned int bit = s3c_irq_uart_bit(irq);
180
181         __raw_writel(1 << bit, regs + S3C64XX_UINTP);
182 }
183
184 static void s3c_irq_demux_uart(unsigned int irq, struct irq_desc *desc)
185 {
186         struct uart_irq *uirq = &uart_irqs[irq - IRQ_UART0];
187         u32 pend = __raw_readl(uirq->regs + S3C64XX_UINTP);
188         int base = uirq->base_irq;
189
190         if (pend & (1 << 0))
191                 generic_handle_irq(base);
192         if (pend & (1 << 1))
193                 generic_handle_irq(base + 1);
194         if (pend & (1 << 2))
195                 generic_handle_irq(base + 2);
196         if (pend & (1 << 3))
197                 generic_handle_irq(base + 3);
198 }
199
200 static struct irq_chip s3c_irq_uart = {
201         .name           = "s3c-uart",
202         .mask           = s3c_irq_uart_mask,
203         .unmask         = s3c_irq_uart_unmask,
204         .mask_ack       = s3c_irq_uart_maskack,
205         .ack            = s3c_irq_uart_ack,
206 };
207
208 static void __init s3c64xx_uart_irq(struct uart_irq *uirq)
209 {
210         void *reg_base = uirq->regs;
211         unsigned int irq;
212         int offs;
213
214         /* mask all interrupts at the start. */
215         __raw_writel(0xf, reg_base + S3C64XX_UINTM);
216
217         for (offs = 0; offs < 3; offs++) {
218                 irq = uirq->base_irq + offs;
219
220                 set_irq_chip(irq, &s3c_irq_uart);
221                 set_irq_chip_data(irq, uirq);
222                 set_irq_handler(irq, handle_level_irq);
223                 set_irq_flags(irq, IRQF_VALID);
224         }
225
226         set_irq_chained_handler(uirq->parent_irq, s3c_irq_demux_uart);
227 }
228
229 void __init s3c64xx_init_irq(u32 vic0_valid, u32 vic1_valid)
230 {
231         int uart, irq;
232
233         printk(KERN_DEBUG "%s: initialising interrupts\n", __func__);
234
235         /* initialise the pair of VICs */
236         vic_init(S3C_VA_VIC0, S3C_VIC0_BASE, vic0_valid);
237         vic_init(S3C_VA_VIC1, S3C_VIC1_BASE, vic1_valid);
238
239         /* add the timer sub-irqs */
240
241         set_irq_chained_handler(IRQ_TIMER0_VIC, s3c_irq_demux_timer0);
242         set_irq_chained_handler(IRQ_TIMER1_VIC, s3c_irq_demux_timer1);
243         set_irq_chained_handler(IRQ_TIMER2_VIC, s3c_irq_demux_timer2);
244         set_irq_chained_handler(IRQ_TIMER3_VIC, s3c_irq_demux_timer3);
245         set_irq_chained_handler(IRQ_TIMER4_VIC, s3c_irq_demux_timer4);
246
247         for (irq = IRQ_TIMER0; irq <= IRQ_TIMER4; irq++) {
248                 set_irq_chip(irq, &s3c_irq_timer);
249                 set_irq_handler(irq, handle_level_irq);
250                 set_irq_flags(irq, IRQF_VALID);
251         }
252
253         for (uart = 0; uart < ARRAY_SIZE(uart_irqs); uart++)
254                 s3c64xx_uart_irq(&uart_irqs[uart]);
255 }
256
257