2 * Atheros AR71xx SoC specific interrupt handling
4 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 * Parts of this file are based on Atheros' 2.6.15 BSP
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
19 #include <asm/irq_cpu.h>
20 #include <asm/mipsregs.h>
22 #include <asm/mach-ar71xx/ar71xx.h>
25 static void ar71xx_pci_irq_dispatch(void)
29 pending
= ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_STATUS
) &
30 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE
);
32 if (pending
& PCI_INT_DEV0
)
33 do_IRQ(AR71XX_PCI_IRQ_DEV0
);
35 else if (pending
& PCI_INT_DEV1
)
36 do_IRQ(AR71XX_PCI_IRQ_DEV1
);
38 else if (pending
& PCI_INT_DEV2
)
39 do_IRQ(AR71XX_PCI_IRQ_DEV2
);
41 else if (pending
& PCI_INT_CORE
)
42 do_IRQ(AR71XX_PCI_IRQ_CORE
);
48 static void ar71xx_pci_irq_unmask(unsigned int irq
)
50 irq
-= AR71XX_PCI_IRQ_BASE
;
51 ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_ENABLE
,
52 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE
) | (1 << irq
));
55 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE
);
58 static void ar71xx_pci_irq_mask(unsigned int irq
)
60 irq
-= AR71XX_PCI_IRQ_BASE
;
61 ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_ENABLE
,
62 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE
) & ~(1 << irq
));
65 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE
);
68 static struct irq_chip ar71xx_pci_irq_chip
= {
69 .name
= "AR71XX PCI ",
70 .mask
= ar71xx_pci_irq_mask
,
71 .unmask
= ar71xx_pci_irq_unmask
,
72 .mask_ack
= ar71xx_pci_irq_mask
,
75 static struct irqaction ar71xx_pci_irqaction
= {
77 .name
= "cascade [AR71XX PCI]",
80 static void __init
ar71xx_pci_irq_init(void)
84 ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_ENABLE
, 0);
85 ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_STATUS
, 0);
87 for (i
= AR71XX_PCI_IRQ_BASE
;
88 i
< AR71XX_PCI_IRQ_BASE
+ AR71XX_PCI_IRQ_COUNT
; i
++) {
89 irq_desc
[i
].status
= IRQ_DISABLED
;
90 set_irq_chip_and_handler(i
, &ar71xx_pci_irq_chip
,
94 setup_irq(AR71XX_CPU_IRQ_PCI
, &ar71xx_pci_irqaction
);
96 #endif /* CONFIG_PCI */
98 static void ar71xx_gpio_irq_dispatch(void)
102 pending
= ar71xx_gpio_rr(GPIO_REG_INT_PENDING
)
103 & ar71xx_gpio_rr(GPIO_REG_INT_ENABLE
);
106 do_IRQ(AR71XX_GPIO_IRQ_BASE
+ fls(pending
) - 1);
108 spurious_interrupt();
111 static void ar71xx_gpio_irq_unmask(unsigned int irq
)
113 irq
-= AR71XX_GPIO_IRQ_BASE
;
114 ar71xx_gpio_wr(GPIO_REG_INT_ENABLE
,
115 ar71xx_gpio_rr(GPIO_REG_INT_ENABLE
) | (1 << irq
));
118 ar71xx_gpio_rr(GPIO_REG_INT_ENABLE
);
121 static void ar71xx_gpio_irq_mask(unsigned int irq
)
123 irq
-= AR71XX_GPIO_IRQ_BASE
;
124 ar71xx_gpio_wr(GPIO_REG_INT_ENABLE
,
125 ar71xx_gpio_rr(GPIO_REG_INT_ENABLE
) & ~(1 << irq
));
128 ar71xx_gpio_rr(GPIO_REG_INT_ENABLE
);
132 static int ar71xx_gpio_irq_set_type(unsigned int irq
, unsigned int flow_type
)
134 /* TODO: implement */
138 #define ar71xx_gpio_irq_set_type NULL
141 struct irq_chip ar71xx_gpio_irq_chip
= {
142 .name
= "AR71XX GPIO",
143 .unmask
= ar71xx_gpio_irq_unmask
,
144 .mask
= ar71xx_gpio_irq_mask
,
145 .mask_ack
= ar71xx_gpio_irq_mask
,
146 .set_type
= ar71xx_gpio_irq_set_type
,
149 static struct irqaction ar71xx_gpio_irqaction
= {
150 .handler
= no_action
,
151 .name
= "cascade [AR71XX GPIO]",
154 #define GPIO_IRQ_INIT_STATUS (IRQ_LEVEL | IRQ_TYPE_LEVEL_HIGH | IRQ_DISABLED)
155 #define GPIO_INT_ALL 0xffff
157 static void __init
ar71xx_gpio_irq_init(void)
161 ar71xx_gpio_wr(GPIO_REG_INT_ENABLE
, 0);
162 ar71xx_gpio_wr(GPIO_REG_INT_PENDING
, 0);
164 /* setup type of all GPIO interrupts to level sensitive */
165 ar71xx_gpio_wr(GPIO_REG_INT_TYPE
, GPIO_INT_ALL
);
167 /* setup polarity of all GPIO interrupts to active high */
168 ar71xx_gpio_wr(GPIO_REG_INT_POLARITY
, GPIO_INT_ALL
);
170 for (i
= AR71XX_GPIO_IRQ_BASE
;
171 i
< AR71XX_GPIO_IRQ_BASE
+ AR71XX_GPIO_IRQ_COUNT
; i
++) {
172 irq_desc
[i
].status
= GPIO_IRQ_INIT_STATUS
;
173 set_irq_chip_and_handler(i
, &ar71xx_gpio_irq_chip
,
177 setup_irq(AR71XX_MISC_IRQ_GPIO
, &ar71xx_gpio_irqaction
);
180 static void ar71xx_misc_irq_dispatch(void)
184 pending
= ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_STATUS
)
185 & ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE
);
187 if (pending
& MISC_INT_UART
)
188 do_IRQ(AR71XX_MISC_IRQ_UART
);
190 else if (pending
& MISC_INT_DMA
)
191 do_IRQ(AR71XX_MISC_IRQ_DMA
);
193 else if (pending
& MISC_INT_PERFC
)
194 do_IRQ(AR71XX_MISC_IRQ_PERFC
);
196 else if (pending
& MISC_INT_TIMER
)
197 do_IRQ(AR71XX_MISC_IRQ_TIMER
);
199 else if (pending
& MISC_INT_OHCI
)
200 do_IRQ(AR71XX_MISC_IRQ_OHCI
);
202 else if (pending
& MISC_INT_ERROR
)
203 do_IRQ(AR71XX_MISC_IRQ_ERROR
);
205 else if (pending
& MISC_INT_GPIO
)
206 ar71xx_gpio_irq_dispatch();
208 else if (pending
& MISC_INT_WDOG
)
209 do_IRQ(AR71XX_MISC_IRQ_WDOG
);
212 spurious_interrupt();
215 static void ar71xx_misc_irq_unmask(unsigned int irq
)
217 irq
-= AR71XX_MISC_IRQ_BASE
;
218 ar71xx_reset_wr(AR71XX_RESET_REG_MISC_INT_ENABLE
,
219 ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE
) | (1 << irq
));
222 ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE
);
225 static void ar71xx_misc_irq_mask(unsigned int irq
)
227 irq
-= AR71XX_MISC_IRQ_BASE
;
228 ar71xx_reset_wr(AR71XX_RESET_REG_MISC_INT_ENABLE
,
229 ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE
) & ~(1 << irq
));
232 ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE
);
235 struct irq_chip ar71xx_misc_irq_chip
= {
236 .name
= "AR71XX MISC",
237 .unmask
= ar71xx_misc_irq_unmask
,
238 .mask
= ar71xx_misc_irq_mask
,
239 .mask_ack
= ar71xx_misc_irq_mask
,
242 static struct irqaction ar71xx_misc_irqaction
= {
243 .handler
= no_action
,
244 .name
= "cascade [AR71XX MISC]",
247 static void __init
ar71xx_misc_irq_init(void)
251 ar71xx_reset_wr(AR71XX_RESET_REG_MISC_INT_ENABLE
, 0);
252 ar71xx_reset_wr(AR71XX_RESET_REG_MISC_INT_STATUS
, 0);
254 for (i
= AR71XX_MISC_IRQ_BASE
;
255 i
< AR71XX_MISC_IRQ_BASE
+ AR71XX_MISC_IRQ_COUNT
; i
++) {
256 irq_desc
[i
].status
= IRQ_DISABLED
;
257 set_irq_chip_and_handler(i
, &ar71xx_misc_irq_chip
,
261 setup_irq(AR71XX_CPU_IRQ_MISC
, &ar71xx_misc_irqaction
);
264 static void ar913x_wmac_irq_dispatch(void)
266 do_IRQ(AR71XX_CPU_IRQ_WMAC
);
269 static void (* ar71xx_ip2_irq_handler
)(void) = spurious_interrupt
;
271 asmlinkage
void plat_irq_dispatch(void)
273 unsigned long pending
;
275 pending
= read_c0_status() & read_c0_cause() & ST0_IM
;
277 if (pending
& STATUSF_IP7
)
278 do_IRQ(AR71XX_CPU_IRQ_TIMER
);
280 else if (pending
& STATUSF_IP2
)
281 ar71xx_ip2_irq_handler();
283 else if (pending
& STATUSF_IP4
)
284 do_IRQ(AR71XX_CPU_IRQ_GE0
);
286 else if (pending
& STATUSF_IP5
)
287 do_IRQ(AR71XX_CPU_IRQ_GE1
);
289 else if (pending
& STATUSF_IP3
)
290 do_IRQ(AR71XX_CPU_IRQ_USB
);
292 else if (pending
& STATUSF_IP6
)
293 ar71xx_misc_irq_dispatch();
296 spurious_interrupt();
299 void __init
arch_init_irq(void)
303 ar71xx_misc_irq_init();
305 switch (ar71xx_soc
) {
306 case AR71XX_SOC_AR7130
:
307 case AR71XX_SOC_AR7141
:
308 case AR71XX_SOC_AR7161
:
309 case AR71XX_SOC_AR7240
:
311 ar71xx_pci_irq_init();
312 ar71xx_ip2_irq_handler
= ar71xx_pci_irq_dispatch
;
315 case AR71XX_SOC_AR9130
:
316 case AR71XX_SOC_AR9132
:
317 ar71xx_ip2_irq_handler
= ar913x_wmac_irq_dispatch
;
323 ar71xx_gpio_irq_init();