2 * Atheros AR71xx SoC specific interrupt handling
4 * Copyright (C) 2008-2010 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_handler(unsigned int irq, struct irq_desc *desc)
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 generic_handle_irq(AR71XX_PCI_IRQ_DEV0);
35 else if (pending & PCI_INT_DEV1)
36 generic_handle_irq(AR71XX_PCI_IRQ_DEV1);
38 else if (pending & PCI_INT_DEV2)
39 generic_handle_irq(AR71XX_PCI_IRQ_DEV2);
41 else if (pending & PCI_INT_CORE)
42 generic_handle_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 void __init ar71xx_pci_irq_init(void)
79 ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_ENABLE, 0);
80 ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_STATUS, 0);
82 for (i = AR71XX_PCI_IRQ_BASE;
83 i < AR71XX_PCI_IRQ_BASE + AR71XX_PCI_IRQ_COUNT; i++) {
84 irq_desc[i].status = IRQ_DISABLED;
85 set_irq_chip_and_handler(i, &ar71xx_pci_irq_chip,
89 set_irq_chained_handler(AR71XX_CPU_IRQ_IP2, ar71xx_pci_irq_handler);
92 static void ar724x_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
96 pending = ar724x_pci_rr(AR724X_PCI_REG_INT_STATUS) &
97 ar724x_pci_rr(AR724X_PCI_REG_INT_MASK);
99 if (pending & AR724X_PCI_INT_DEV0)
100 generic_handle_irq(AR71XX_PCI_IRQ_DEV0);
103 spurious_interrupt();
106 static void ar724x_pci_irq_unmask(unsigned int irq)
109 case AR71XX_PCI_IRQ_DEV0:
110 irq -= AR71XX_PCI_IRQ_BASE;
111 ar724x_pci_wr(AR724X_PCI_REG_INT_MASK,
112 ar724x_pci_rr(AR724X_PCI_REG_INT_MASK) |
113 AR724X_PCI_INT_DEV0);
115 ar724x_pci_rr(AR724X_PCI_REG_INT_MASK);
119 static void ar724x_pci_irq_mask(unsigned int irq)
122 case AR71XX_PCI_IRQ_DEV0:
123 irq -= AR71XX_PCI_IRQ_BASE;
124 ar724x_pci_wr(AR724X_PCI_REG_INT_MASK,
125 ar724x_pci_rr(AR724X_PCI_REG_INT_MASK) &
126 ~AR724X_PCI_INT_DEV0);
128 ar724x_pci_rr(AR724X_PCI_REG_INT_MASK);
130 ar724x_pci_wr(AR724X_PCI_REG_INT_STATUS,
131 ar724x_pci_rr(AR724X_PCI_REG_INT_STATUS) |
132 AR724X_PCI_INT_DEV0);
134 ar724x_pci_rr(AR724X_PCI_REG_INT_STATUS);
138 static struct irq_chip ar724x_pci_irq_chip = {
139 .name = "AR724X PCI ",
140 .mask = ar724x_pci_irq_mask,
141 .unmask = ar724x_pci_irq_unmask,
142 .mask_ack = ar724x_pci_irq_mask,
145 static void __init ar724x_pci_irq_init(void)
150 t = ar71xx_reset_rr(AR724X_RESET_REG_RESET_MODULE);
151 if (t & (AR724X_RESET_PCIE | AR724X_RESET_PCIE_PHY |
152 AR724X_RESET_PCIE_PHY_SERIAL)) {
156 ar724x_pci_wr(AR724X_PCI_REG_INT_MASK, 0);
157 ar724x_pci_wr(AR724X_PCI_REG_INT_STATUS, 0);
159 for (i = AR71XX_PCI_IRQ_BASE;
160 i < AR71XX_PCI_IRQ_BASE + AR71XX_PCI_IRQ_COUNT; i++) {
161 irq_desc[i].status = IRQ_DISABLED;
162 set_irq_chip_and_handler(i, &ar724x_pci_irq_chip,
166 set_irq_chained_handler(AR71XX_CPU_IRQ_IP2, ar724x_pci_irq_handler);
169 static inline void ar71xx_pci_irq_init(void) {};
170 static inline void ar724x_pci_irq_init(void) {};
171 #endif /* CONFIG_PCI */
173 static void ar71xx_gpio_irq_dispatch(void)
177 pending = ar71xx_gpio_rr(GPIO_REG_INT_PENDING)
178 & ar71xx_gpio_rr(GPIO_REG_INT_ENABLE);
181 do_IRQ(AR71XX_GPIO_IRQ_BASE + fls(pending) - 1);
183 spurious_interrupt();
186 static void ar71xx_gpio_irq_unmask(unsigned int irq)
188 irq -= AR71XX_GPIO_IRQ_BASE;
189 ar71xx_gpio_wr(GPIO_REG_INT_ENABLE,
190 ar71xx_gpio_rr(GPIO_REG_INT_ENABLE) | (1 << irq));
193 ar71xx_gpio_rr(GPIO_REG_INT_ENABLE);
196 static void ar71xx_gpio_irq_mask(unsigned int irq)
198 irq -= AR71XX_GPIO_IRQ_BASE;
199 ar71xx_gpio_wr(GPIO_REG_INT_ENABLE,
200 ar71xx_gpio_rr(GPIO_REG_INT_ENABLE) & ~(1 << irq));
203 ar71xx_gpio_rr(GPIO_REG_INT_ENABLE);
207 static int ar71xx_gpio_irq_set_type(unsigned int irq, unsigned int flow_type)
209 /* TODO: implement */
213 #define ar71xx_gpio_irq_set_type NULL
216 static struct irq_chip ar71xx_gpio_irq_chip = {
217 .name = "AR71XX GPIO",
218 .unmask = ar71xx_gpio_irq_unmask,
219 .mask = ar71xx_gpio_irq_mask,
220 .mask_ack = ar71xx_gpio_irq_mask,
221 .set_type = ar71xx_gpio_irq_set_type,
224 static struct irqaction ar71xx_gpio_irqaction = {
225 .handler = no_action,
226 .name = "cascade [AR71XX GPIO]",
229 #define GPIO_IRQ_INIT_STATUS (IRQ_LEVEL | IRQ_TYPE_LEVEL_HIGH | IRQ_DISABLED)
230 #define GPIO_INT_ALL 0xffff
232 static void __init ar71xx_gpio_irq_init(void)
236 ar71xx_gpio_wr(GPIO_REG_INT_ENABLE, 0);
237 ar71xx_gpio_wr(GPIO_REG_INT_PENDING, 0);
239 /* setup type of all GPIO interrupts to level sensitive */
240 ar71xx_gpio_wr(GPIO_REG_INT_TYPE, GPIO_INT_ALL);
242 /* setup polarity of all GPIO interrupts to active high */
243 ar71xx_gpio_wr(GPIO_REG_INT_POLARITY, GPIO_INT_ALL);
245 for (i = AR71XX_GPIO_IRQ_BASE;
246 i < AR71XX_GPIO_IRQ_BASE + AR71XX_GPIO_IRQ_COUNT; i++) {
247 irq_desc[i].status = GPIO_IRQ_INIT_STATUS;
248 set_irq_chip_and_handler(i, &ar71xx_gpio_irq_chip,
252 setup_irq(AR71XX_MISC_IRQ_GPIO, &ar71xx_gpio_irqaction);
255 static void ar71xx_misc_irq_dispatch(void)
259 pending = ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_STATUS)
260 & ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE);
262 if (pending & MISC_INT_UART)
263 do_IRQ(AR71XX_MISC_IRQ_UART);
265 else if (pending & MISC_INT_DMA)
266 do_IRQ(AR71XX_MISC_IRQ_DMA);
268 else if (pending & MISC_INT_PERFC)
269 do_IRQ(AR71XX_MISC_IRQ_PERFC);
271 else if (pending & MISC_INT_TIMER)
272 do_IRQ(AR71XX_MISC_IRQ_TIMER);
274 else if (pending & MISC_INT_OHCI)
275 do_IRQ(AR71XX_MISC_IRQ_OHCI);
277 else if (pending & MISC_INT_ERROR)
278 do_IRQ(AR71XX_MISC_IRQ_ERROR);
280 else if (pending & MISC_INT_GPIO)
281 ar71xx_gpio_irq_dispatch();
283 else if (pending & MISC_INT_WDOG)
284 do_IRQ(AR71XX_MISC_IRQ_WDOG);
287 spurious_interrupt();
290 static void ar71xx_misc_irq_unmask(unsigned int irq)
292 irq -= AR71XX_MISC_IRQ_BASE;
293 ar71xx_reset_wr(AR71XX_RESET_REG_MISC_INT_ENABLE,
294 ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE) | (1 << irq));
297 ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE);
300 static void ar71xx_misc_irq_mask(unsigned int irq)
302 irq -= AR71XX_MISC_IRQ_BASE;
303 ar71xx_reset_wr(AR71XX_RESET_REG_MISC_INT_ENABLE,
304 ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE) & ~(1 << irq));
307 ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE);
310 static void ar724x_misc_irq_ack(unsigned int irq)
312 irq -= AR71XX_MISC_IRQ_BASE;
313 ar71xx_reset_wr(AR71XX_RESET_REG_MISC_INT_STATUS,
314 ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_STATUS) & ~(1 << irq));
317 ar71xx_reset_rr(AR71XX_RESET_REG_MISC_INT_STATUS);
320 static struct irq_chip ar71xx_misc_irq_chip = {
321 .name = "AR71XX MISC",
322 .unmask = ar71xx_misc_irq_unmask,
323 .mask = ar71xx_misc_irq_mask,
326 static struct irqaction ar71xx_misc_irqaction = {
327 .handler = no_action,
328 .name = "cascade [AR71XX MISC]",
331 static void __init ar71xx_misc_irq_init(void)
335 ar71xx_reset_wr(AR71XX_RESET_REG_MISC_INT_ENABLE, 0);
336 ar71xx_reset_wr(AR71XX_RESET_REG_MISC_INT_STATUS, 0);
338 if (ar71xx_soc == AR71XX_SOC_AR7240)
339 ar71xx_misc_irq_chip.ack = ar724x_misc_irq_ack;
341 ar71xx_misc_irq_chip.mask_ack = ar71xx_misc_irq_mask;
343 for (i = AR71XX_MISC_IRQ_BASE;
344 i < AR71XX_MISC_IRQ_BASE + AR71XX_MISC_IRQ_COUNT; i++) {
345 irq_desc[i].status = IRQ_DISABLED;
346 set_irq_chip_and_handler(i, &ar71xx_misc_irq_chip,
350 setup_irq(AR71XX_CPU_IRQ_MISC, &ar71xx_misc_irqaction);
353 asmlinkage void plat_irq_dispatch(void)
355 unsigned long pending;
357 pending = read_c0_status() & read_c0_cause() & ST0_IM;
359 if (pending & STATUSF_IP7)
360 do_IRQ(AR71XX_CPU_IRQ_TIMER);
362 else if (pending & STATUSF_IP2)
363 do_IRQ(AR71XX_CPU_IRQ_IP2);
365 else if (pending & STATUSF_IP4)
366 do_IRQ(AR71XX_CPU_IRQ_GE0);
368 else if (pending & STATUSF_IP5)
369 do_IRQ(AR71XX_CPU_IRQ_GE1);
371 else if (pending & STATUSF_IP3)
372 do_IRQ(AR71XX_CPU_IRQ_USB);
374 else if (pending & STATUSF_IP6)
375 ar71xx_misc_irq_dispatch();
378 spurious_interrupt();
381 void __init arch_init_irq(void)
385 ar71xx_misc_irq_init();
387 cp0_perfcount_irq = AR71XX_MISC_IRQ_PERFC;
389 switch (ar71xx_soc) {
390 case AR71XX_SOC_AR7130:
391 case AR71XX_SOC_AR7141:
392 case AR71XX_SOC_AR7161:
393 ar71xx_pci_irq_init();
395 case AR71XX_SOC_AR7240:
396 ar724x_pci_irq_init();
402 ar71xx_gpio_irq_init();