tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Atheros AR71xx/AR724x/AR913x specific interrupt handling
3 *
4 * Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
5 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
6 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 *
8 * Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 */
14
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/irq.h>
19
20#include <asm/irq_cpu.h>
21#include <asm/mipsregs.h>
22
23#include <asm/mach-ath79/ath79.h>
24#include <asm/mach-ath79/ar71xx_regs.h>
25#include "common.h"
26
27static void (*ath79_ip2_handler)(void);
28static void (*ath79_ip3_handler)(void);
29
30static void ath79_misc_irq_handler(unsigned int irq, struct irq_desc *desc)
31{
32 void __iomem *base = ath79_reset_base;
33 u32 pending;
34
35 pending = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS) &
36 __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
37
38 if (pending & MISC_INT_UART)
39 generic_handle_irq(ATH79_MISC_IRQ_UART);
40
41 else if (pending & MISC_INT_DMA)
42 generic_handle_irq(ATH79_MISC_IRQ_DMA);
43
44 else if (pending & MISC_INT_PERFC)
45 generic_handle_irq(ATH79_MISC_IRQ_PERFC);
46
47 else if (pending & MISC_INT_TIMER)
48 generic_handle_irq(ATH79_MISC_IRQ_TIMER);
49
50 else if (pending & MISC_INT_TIMER2)
51 generic_handle_irq(ATH79_MISC_IRQ_TIMER2);
52
53 else if (pending & MISC_INT_TIMER3)
54 generic_handle_irq(ATH79_MISC_IRQ_TIMER3);
55
56 else if (pending & MISC_INT_TIMER4)
57 generic_handle_irq(ATH79_MISC_IRQ_TIMER4);
58
59 else if (pending & MISC_INT_OHCI)
60 generic_handle_irq(ATH79_MISC_IRQ_OHCI);
61
62 else if (pending & MISC_INT_ERROR)
63 generic_handle_irq(ATH79_MISC_IRQ_ERROR);
64
65 else if (pending & MISC_INT_GPIO)
66 generic_handle_irq(ATH79_MISC_IRQ_GPIO);
67
68 else if (pending & MISC_INT_WDOG)
69 generic_handle_irq(ATH79_MISC_IRQ_WDOG);
70
71 else if (pending & MISC_INT_ETHSW)
72 generic_handle_irq(ATH79_MISC_IRQ_ETHSW);
73
74 else
75 spurious_interrupt();
76}
77
78static void ar71xx_misc_irq_unmask(struct irq_data *d)
79{
80 unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
81 void __iomem *base = ath79_reset_base;
82 u32 t;
83
84 t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
85 __raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);
86
87 /* flush write */
88 __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
89}
90
91static void ar71xx_misc_irq_mask(struct irq_data *d)
92{
93 unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
94 void __iomem *base = ath79_reset_base;
95 u32 t;
96
97 t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
98 __raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);
99
100 /* flush write */
101 __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
102}
103
104static void ar724x_misc_irq_ack(struct irq_data *d)
105{
106 unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
107 void __iomem *base = ath79_reset_base;
108 u32 t;
109
110 t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
111 __raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_STATUS);
112
113 /* flush write */
114 __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
115}
116
117static struct irq_chip ath79_misc_irq_chip = {
118 .name = "MISC",
119 .irq_unmask = ar71xx_misc_irq_unmask,
120 .irq_mask = ar71xx_misc_irq_mask,
121};
122
123static void __init ath79_misc_irq_init(void)
124{
125 void __iomem *base = ath79_reset_base;
126 int i;
127
128 __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
129 __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);
130
131 if (soc_is_ar71xx() || soc_is_ar913x())
132 ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
133 else if (soc_is_ar724x() || soc_is_ar933x() || soc_is_ar934x())
134 ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
135 else
136 BUG();
137
138 for (i = ATH79_MISC_IRQ_BASE;
139 i < ATH79_MISC_IRQ_BASE + ATH79_MISC_IRQ_COUNT; i++) {
140 irq_set_chip_and_handler(i, &ath79_misc_irq_chip,
141 handle_level_irq);
142 }
143
144 irq_set_chained_handler(ATH79_CPU_IRQ_MISC, ath79_misc_irq_handler);
145}
146
147static void ar934x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc)
148{
149 u32 status;
150
151 disable_irq_nosync(irq);
152
153 status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS);
154
155 if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) {
156 ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_PCIE);
157 generic_handle_irq(ATH79_IP2_IRQ(0));
158 } else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
159 ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_WMAC);
160 generic_handle_irq(ATH79_IP2_IRQ(1));
161 } else {
162 spurious_interrupt();
163 }
164
165 enable_irq(irq);
166}
167
168static void ar934x_ip2_irq_init(void)
169{
170 int i;
171
172 for (i = ATH79_IP2_IRQ_BASE;
173 i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
174 irq_set_chip_and_handler(i, &dummy_irq_chip,
175 handle_level_irq);
176
177 irq_set_chained_handler(ATH79_CPU_IRQ_IP2, ar934x_ip2_irq_dispatch);
178}
179
180asmlinkage void plat_irq_dispatch(void)
181{
182 unsigned long pending;
183
184 pending = read_c0_status() & read_c0_cause() & ST0_IM;
185
186 if (pending & STATUSF_IP7)
187 do_IRQ(ATH79_CPU_IRQ_TIMER);
188
189 else if (pending & STATUSF_IP2)
190 ath79_ip2_handler();
191
192 else if (pending & STATUSF_IP4)
193 do_IRQ(ATH79_CPU_IRQ_GE0);
194
195 else if (pending & STATUSF_IP5)
196 do_IRQ(ATH79_CPU_IRQ_GE1);
197
198 else if (pending & STATUSF_IP3)
199 ath79_ip3_handler();
200
201 else if (pending & STATUSF_IP6)
202 do_IRQ(ATH79_CPU_IRQ_MISC);
203
204 else
205 spurious_interrupt();
206}
207
208/*
209 * The IP2/IP3 lines are tied to a PCI/WMAC/USB device. Drivers for
210 * these devices typically allocate coherent DMA memory, however the
211 * DMA controller may still have some unsynchronized data in the FIFO.
212 * Issue a flush in the handlers to ensure that the driver sees
213 * the update.
214 */
215static void ar71xx_ip2_handler(void)
216{
217 ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_PCI);
218 do_IRQ(ATH79_CPU_IRQ_IP2);
219}
220
221static void ar724x_ip2_handler(void)
222{
223 ath79_ddr_wb_flush(AR724X_DDR_REG_FLUSH_PCIE);
224 do_IRQ(ATH79_CPU_IRQ_IP2);
225}
226
227static void ar913x_ip2_handler(void)
228{
229 ath79_ddr_wb_flush(AR913X_DDR_REG_FLUSH_WMAC);
230 do_IRQ(ATH79_CPU_IRQ_IP2);
231}
232
233static void ar933x_ip2_handler(void)
234{
235 ath79_ddr_wb_flush(AR933X_DDR_REG_FLUSH_WMAC);
236 do_IRQ(ATH79_CPU_IRQ_IP2);
237}
238
239static void ar934x_ip2_handler(void)
240{
241 do_IRQ(ATH79_CPU_IRQ_IP2);
242}
243
244static void ar71xx_ip3_handler(void)
245{
246 ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_USB);
247 do_IRQ(ATH79_CPU_IRQ_USB);
248}
249
250static void ar724x_ip3_handler(void)
251{
252 ath79_ddr_wb_flush(AR724X_DDR_REG_FLUSH_USB);
253 do_IRQ(ATH79_CPU_IRQ_USB);
254}
255
256static void ar913x_ip3_handler(void)
257{
258 ath79_ddr_wb_flush(AR913X_DDR_REG_FLUSH_USB);
259 do_IRQ(ATH79_CPU_IRQ_USB);
260}
261
262static void ar933x_ip3_handler(void)
263{
264 ath79_ddr_wb_flush(AR933X_DDR_REG_FLUSH_USB);
265 do_IRQ(ATH79_CPU_IRQ_USB);
266}
267
268static void ar934x_ip3_handler(void)
269{
270 ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_USB);
271 do_IRQ(ATH79_CPU_IRQ_USB);
272}
273
274void __init arch_init_irq(void)
275{
276 if (soc_is_ar71xx()) {
277 ath79_ip2_handler = ar71xx_ip2_handler;
278 ath79_ip3_handler = ar71xx_ip3_handler;
279 } else if (soc_is_ar724x()) {
280 ath79_ip2_handler = ar724x_ip2_handler;
281 ath79_ip3_handler = ar724x_ip3_handler;
282 } else if (soc_is_ar913x()) {
283 ath79_ip2_handler = ar913x_ip2_handler;
284 ath79_ip3_handler = ar913x_ip3_handler;
285 } else if (soc_is_ar933x()) {
286 ath79_ip2_handler = ar933x_ip2_handler;
287 ath79_ip3_handler = ar933x_ip3_handler;
288 } else if (soc_is_ar934x()) {
289 ath79_ip2_handler = ar934x_ip2_handler;
290 ath79_ip3_handler = ar934x_ip3_handler;
291 } else {
292 BUG();
293 }
294
295 cp0_perfcount_irq = ATH79_MISC_IRQ_PERFC;
296 mips_cpu_irq_init();
297 ath79_misc_irq_init();
298
299 if (soc_is_ar934x())
300 ar934x_ip2_irq_init();
301}