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1 /*
2  * arch/arm/mach-lpc32xx/irq.c
3  *
4  * Author: Kevin Wells <kevin.wells@nxp.com>
5  *
6  * Copyright (C) 2010 NXP Semiconductors
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  */
18
19 #include <linux/kernel.h>
20 #include <linux/types.h>
21 #include <linux/interrupt.h>
22 #include <linux/irq.h>
23 #include <linux/err.h>
24 #include <linux/io.h>
25
26 #include <mach/irqs.h>
27 #include <mach/hardware.h>
28 #include <mach/platform.h>
29 #include "common.h"
30
31 /*
32  * Default value representing the Activation polarity of all internal
33  * interrupt sources
34  */
35 #define MIC_APR_DEFAULT         0x3FF0EFE0
36 #define SIC1_APR_DEFAULT        0xFBD27186
37 #define SIC2_APR_DEFAULT        0x801810C0
38
39 /*
40  * Default value representing the Activation Type of all internal
41  * interrupt sources. All are level sensitive.
42  */
43 #define MIC_ATR_DEFAULT         0x00000000
44 #define SIC1_ATR_DEFAULT        0x00026000
45 #define SIC2_ATR_DEFAULT        0x00000000
46
47 struct lpc32xx_event_group_regs {
48         void __iomem *enab_reg;
49         void __iomem *edge_reg;
50         void __iomem *maskstat_reg;
51         void __iomem *rawstat_reg;
52 };
53
54 static const struct lpc32xx_event_group_regs lpc32xx_event_int_regs = {
55         .enab_reg = LPC32XX_CLKPWR_INT_ER,
56         .edge_reg = LPC32XX_CLKPWR_INT_AP,
57         .maskstat_reg = LPC32XX_CLKPWR_INT_SR,
58         .rawstat_reg = LPC32XX_CLKPWR_INT_RS,
59 };
60
61 static const struct lpc32xx_event_group_regs lpc32xx_event_pin_regs = {
62         .enab_reg = LPC32XX_CLKPWR_PIN_ER,
63         .edge_reg = LPC32XX_CLKPWR_PIN_AP,
64         .maskstat_reg = LPC32XX_CLKPWR_PIN_SR,
65         .rawstat_reg = LPC32XX_CLKPWR_PIN_RS,
66 };
67
68 struct lpc32xx_event_info {
69         const struct lpc32xx_event_group_regs *event_group;
70         u32 mask;
71 };
72
73 /*
74  * Maps an IRQ number to and event mask and register
75  */
76 static const struct lpc32xx_event_info lpc32xx_events[NR_IRQS] = {
77         [IRQ_LPC32XX_GPI_08] = {
78                 .event_group = &lpc32xx_event_pin_regs,
79                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_08_BIT,
80         },
81         [IRQ_LPC32XX_GPI_09] = {
82                 .event_group = &lpc32xx_event_pin_regs,
83                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_09_BIT,
84         },
85         [IRQ_LPC32XX_GPI_19] = {
86                 .event_group = &lpc32xx_event_pin_regs,
87                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_19_BIT,
88         },
89         [IRQ_LPC32XX_GPI_07] = {
90                 .event_group = &lpc32xx_event_pin_regs,
91                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_07_BIT,
92         },
93         [IRQ_LPC32XX_GPI_00] = {
94                 .event_group = &lpc32xx_event_pin_regs,
95                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_00_BIT,
96         },
97         [IRQ_LPC32XX_GPI_01] = {
98                 .event_group = &lpc32xx_event_pin_regs,
99                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_01_BIT,
100         },
101         [IRQ_LPC32XX_GPI_02] = {
102                 .event_group = &lpc32xx_event_pin_regs,
103                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_02_BIT,
104         },
105         [IRQ_LPC32XX_GPI_03] = {
106                 .event_group = &lpc32xx_event_pin_regs,
107                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_03_BIT,
108         },
109         [IRQ_LPC32XX_GPI_04] = {
110                 .event_group = &lpc32xx_event_pin_regs,
111                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_04_BIT,
112         },
113         [IRQ_LPC32XX_GPI_05] = {
114                 .event_group = &lpc32xx_event_pin_regs,
115                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_05_BIT,
116         },
117         [IRQ_LPC32XX_GPI_06] = {
118                 .event_group = &lpc32xx_event_pin_regs,
119                 .mask = LPC32XX_CLKPWR_EXTSRC_GPI_06_BIT,
120         },
121         [IRQ_LPC32XX_GPIO_00] = {
122                 .event_group = &lpc32xx_event_int_regs,
123                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_00_BIT,
124         },
125         [IRQ_LPC32XX_GPIO_01] = {
126                 .event_group = &lpc32xx_event_int_regs,
127                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_01_BIT,
128         },
129         [IRQ_LPC32XX_GPIO_02] = {
130                 .event_group = &lpc32xx_event_int_regs,
131                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_02_BIT,
132         },
133         [IRQ_LPC32XX_GPIO_03] = {
134                 .event_group = &lpc32xx_event_int_regs,
135                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_03_BIT,
136         },
137         [IRQ_LPC32XX_GPIO_04] = {
138                 .event_group = &lpc32xx_event_int_regs,
139                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_04_BIT,
140         },
141         [IRQ_LPC32XX_GPIO_05] = {
142                 .event_group = &lpc32xx_event_int_regs,
143                 .mask = LPC32XX_CLKPWR_INTSRC_GPIO_05_BIT,
144         },
145         [IRQ_LPC32XX_KEY] = {
146                 .event_group = &lpc32xx_event_int_regs,
147                 .mask = LPC32XX_CLKPWR_INTSRC_KEY_BIT,
148         },
149         [IRQ_LPC32XX_USB_OTG_ATX] = {
150                 .event_group = &lpc32xx_event_int_regs,
151                 .mask = LPC32XX_CLKPWR_INTSRC_USBATXINT_BIT,
152         },
153         [IRQ_LPC32XX_USB_HOST] = {
154                 .event_group = &lpc32xx_event_int_regs,
155                 .mask = LPC32XX_CLKPWR_INTSRC_USB_BIT,
156         },
157         [IRQ_LPC32XX_RTC] = {
158                 .event_group = &lpc32xx_event_int_regs,
159                 .mask = LPC32XX_CLKPWR_INTSRC_RTC_BIT,
160         },
161         [IRQ_LPC32XX_MSTIMER] = {
162                 .event_group = &lpc32xx_event_int_regs,
163                 .mask = LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT,
164         },
165         [IRQ_LPC32XX_TS_AUX] = {
166                 .event_group = &lpc32xx_event_int_regs,
167                 .mask = LPC32XX_CLKPWR_INTSRC_TS_AUX_BIT,
168         },
169         [IRQ_LPC32XX_TS_P] = {
170                 .event_group = &lpc32xx_event_int_regs,
171                 .mask = LPC32XX_CLKPWR_INTSRC_TS_P_BIT,
172         },
173         [IRQ_LPC32XX_TS_IRQ] = {
174                 .event_group = &lpc32xx_event_int_regs,
175                 .mask = LPC32XX_CLKPWR_INTSRC_ADC_BIT,
176         },
177 };
178
179 static void get_controller(unsigned int irq, unsigned int *base,
180         unsigned int *irqbit)
181 {
182         if (irq < 32) {
183                 *base = LPC32XX_MIC_BASE;
184                 *irqbit = 1 << irq;
185         } else if (irq < 64) {
186                 *base = LPC32XX_SIC1_BASE;
187                 *irqbit = 1 << (irq - 32);
188         } else {
189                 *base = LPC32XX_SIC2_BASE;
190                 *irqbit = 1 << (irq - 64);
191         }
192 }
193
194 static void lpc32xx_mask_irq(struct irq_data *d)
195 {
196         unsigned int reg, ctrl, mask;
197
198         get_controller(d->irq, &ctrl, &mask);
199
200         reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) & ~mask;
201         __raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
202 }
203
204 static void lpc32xx_unmask_irq(struct irq_data *d)
205 {
206         unsigned int reg, ctrl, mask;
207
208         get_controller(d->irq, &ctrl, &mask);
209
210         reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) | mask;
211         __raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
212 }
213
214 static void lpc32xx_ack_irq(struct irq_data *d)
215 {
216         unsigned int ctrl, mask;
217
218         get_controller(d->irq, &ctrl, &mask);
219
220         __raw_writel(mask, LPC32XX_INTC_RAW_STAT(ctrl));
221
222         /* Also need to clear pending wake event */
223         if (lpc32xx_events[d->irq].mask != 0)
224                 __raw_writel(lpc32xx_events[d->irq].mask,
225                         lpc32xx_events[d->irq].event_group->rawstat_reg);
226 }
227
228 static void __lpc32xx_set_irq_type(unsigned int irq, int use_high_level,
229         int use_edge)
230 {
231         unsigned int reg, ctrl, mask;
232
233         get_controller(irq, &ctrl, &mask);
234
235         /* Activation level, high or low */
236         reg = __raw_readl(LPC32XX_INTC_POLAR(ctrl));
237         if (use_high_level)
238                 reg |= mask;
239         else
240                 reg &= ~mask;
241         __raw_writel(reg, LPC32XX_INTC_POLAR(ctrl));
242
243         /* Activation type, edge or level */
244         reg = __raw_readl(LPC32XX_INTC_ACT_TYPE(ctrl));
245         if (use_edge)
246                 reg |= mask;
247         else
248                 reg &= ~mask;
249         __raw_writel(reg, LPC32XX_INTC_ACT_TYPE(ctrl));
250
251         /* Use same polarity for the wake events */
252         if (lpc32xx_events[irq].mask != 0) {
253                 reg = __raw_readl(lpc32xx_events[irq].event_group->edge_reg);
254
255                 if (use_high_level)
256                         reg |= lpc32xx_events[irq].mask;
257                 else
258                         reg &= ~lpc32xx_events[irq].mask;
259
260                 __raw_writel(reg, lpc32xx_events[irq].event_group->edge_reg);
261         }
262 }
263
264 static int lpc32xx_set_irq_type(struct irq_data *d, unsigned int type)
265 {
266         switch (type) {
267         case IRQ_TYPE_EDGE_RISING:
268                 /* Rising edge sensitive */
269                 __lpc32xx_set_irq_type(d->irq, 1, 1);
270                 break;
271
272         case IRQ_TYPE_EDGE_FALLING:
273                 /* Falling edge sensitive */
274                 __lpc32xx_set_irq_type(d->irq, 0, 1);
275                 break;
276
277         case IRQ_TYPE_LEVEL_LOW:
278                 /* Low level sensitive */
279                 __lpc32xx_set_irq_type(d->irq, 0, 0);
280                 break;
281
282         case IRQ_TYPE_LEVEL_HIGH:
283                 /* High level sensitive */
284                 __lpc32xx_set_irq_type(d->irq, 1, 0);
285                 break;
286
287         /* Other modes are not supported */
288         default:
289                 return -EINVAL;
290         }
291
292         /* Ok to use the level handler for all types */
293         irq_set_handler(d->irq, handle_level_irq);
294
295         return 0;
296 }
297
298 static int lpc32xx_irq_wake(struct irq_data *d, unsigned int state)
299 {
300         unsigned long eventreg;
301
302         if (lpc32xx_events[d->irq].mask != 0) {
303                 eventreg = __raw_readl(lpc32xx_events[d->irq].
304                         event_group->enab_reg);
305
306                 if (state)
307                         eventreg |= lpc32xx_events[d->irq].mask;
308                 else
309                         eventreg &= ~lpc32xx_events[d->irq].mask;
310
311                 __raw_writel(eventreg,
312                         lpc32xx_events[d->irq].event_group->enab_reg);
313
314                 return 0;
315         }
316
317         /* Clear event */
318         __raw_writel(lpc32xx_events[d->irq].mask,
319                 lpc32xx_events[d->irq].event_group->rawstat_reg);
320
321         return -ENODEV;
322 }
323
324 static void __init lpc32xx_set_default_mappings(unsigned int apr,
325         unsigned int atr, unsigned int offset)
326 {
327         unsigned int i;
328
329         /* Set activation levels for each interrupt */
330         i = 0;
331         while (i < 32) {
332                 __lpc32xx_set_irq_type(offset + i, ((apr >> i) & 0x1),
333                         ((atr >> i) & 0x1));
334                 i++;
335         }
336 }
337
338 static struct irq_chip lpc32xx_irq_chip = {
339         .irq_ack = lpc32xx_ack_irq,
340         .irq_mask = lpc32xx_mask_irq,
341         .irq_unmask = lpc32xx_unmask_irq,
342         .irq_set_type = lpc32xx_set_irq_type,
343         .irq_set_wake = lpc32xx_irq_wake
344 };
345
346 static void lpc32xx_sic1_handler(unsigned int irq, struct irq_desc *desc)
347 {
348         unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC1_BASE));
349
350         while (ints != 0) {
351                 int irqno = fls(ints) - 1;
352
353                 ints &= ~(1 << irqno);
354
355                 generic_handle_irq(LPC32XX_SIC1_IRQ(irqno));
356         }
357 }
358
359 static void lpc32xx_sic2_handler(unsigned int irq, struct irq_desc *desc)
360 {
361         unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC2_BASE));
362
363         while (ints != 0) {
364                 int irqno = fls(ints) - 1;
365
366                 ints &= ~(1 << irqno);
367
368                 generic_handle_irq(LPC32XX_SIC2_IRQ(irqno));
369         }
370 }
371
372 void __init lpc32xx_init_irq(void)
373 {
374         unsigned int i;
375
376         /* Setup MIC */
377         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
378         __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_MIC_BASE));
379         __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_MIC_BASE));
380
381         /* Setup SIC1 */
382         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
383         __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC1_BASE));
384         __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC1_BASE));
385
386         /* Setup SIC2 */
387         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
388         __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC2_BASE));
389         __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC2_BASE));
390
391         /* Configure supported IRQ's */
392         for (i = 0; i < NR_IRQS; i++) {
393                 irq_set_chip_and_handler(i, &lpc32xx_irq_chip,
394                                          handle_level_irq);
395                 set_irq_flags(i, IRQF_VALID);
396         }
397
398         /* Set default mappings */
399         lpc32xx_set_default_mappings(MIC_APR_DEFAULT, MIC_ATR_DEFAULT, 0);
400         lpc32xx_set_default_mappings(SIC1_APR_DEFAULT, SIC1_ATR_DEFAULT, 32);
401         lpc32xx_set_default_mappings(SIC2_APR_DEFAULT, SIC2_ATR_DEFAULT, 64);
402
403         /* mask all interrupts except SUBIRQ */
404         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
405         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
406         __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
407
408         /* MIC SUBIRQx interrupts will route handling to the chain handlers */
409         irq_set_chained_handler(IRQ_LPC32XX_SUB1IRQ, lpc32xx_sic1_handler);
410         irq_set_chained_handler(IRQ_LPC32XX_SUB2IRQ, lpc32xx_sic2_handler);
411
412         /* Initially disable all wake events */
413         __raw_writel(0, LPC32XX_CLKPWR_P01_ER);
414         __raw_writel(0, LPC32XX_CLKPWR_INT_ER);
415         __raw_writel(0, LPC32XX_CLKPWR_PIN_ER);
416
417         /*
418          * Default wake activation polarities, all pin sources are low edge
419          * triggered
420          */
421         __raw_writel(LPC32XX_CLKPWR_INTSRC_TS_P_BIT |
422                 LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT |
423                 LPC32XX_CLKPWR_INTSRC_RTC_BIT,
424                 LPC32XX_CLKPWR_INT_AP);
425         __raw_writel(0, LPC32XX_CLKPWR_PIN_AP);
426
427         /* Clear latched wake event states */
428         __raw_writel(__raw_readl(LPC32XX_CLKPWR_PIN_RS),
429                 LPC32XX_CLKPWR_PIN_RS);
430         __raw_writel(__raw_readl(LPC32XX_CLKPWR_INT_RS),
431                 LPC32XX_CLKPWR_INT_RS);
432 }