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diff --git a/arch/arm/mach-u300/timer.c b/arch/arm/mach-u300/timer.c
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1/*
2 *
3 * arch/arm/mach-u300/timer.c
4 *
5 *
6 * Copyright (C) 2007-2009 ST-Ericsson AB
7 * License terms: GNU General Public License (GPL) version 2
8 * Timer COH 901 328, runs the OS timer interrupt.
9 * Author: Linus Walleij <linus.walleij@stericsson.com>
10 */
11#include <linux/interrupt.h>
12#include <linux/time.h>
13#include <linux/timex.h>
14#include <linux/clockchips.h>
15#include <linux/clocksource.h>
16#include <linux/types.h>
17#include <linux/io.h>
18
19#include <mach/hardware.h>
20
21/* Generic stuff */
22#include <asm/mach/map.h>
23#include <asm/mach/time.h>
24#include <asm/mach/irq.h>
25
26#include "clock.h"
27
28/*
29 * APP side special timer registers
30 * This timer contains four timers which can fire an interrupt each.
31 * OS (operating system) timer @ 32768 Hz
32 * DD (device driver) timer @ 1 kHz
33 * GP1 (general purpose 1) timer @ 1MHz
34 * GP2 (general purpose 2) timer @ 1MHz
35 */
36
37/* Reset OS Timer 32bit (-/W) */
38#define U300_TIMER_APP_ROST (0x0000)
39#define U300_TIMER_APP_ROST_TIMER_RESET (0x00000000)
40/* Enable OS Timer 32bit (-/W) */
41#define U300_TIMER_APP_EOST (0x0004)
42#define U300_TIMER_APP_EOST_TIMER_ENABLE (0x00000000)
43/* Disable OS Timer 32bit (-/W) */
44#define U300_TIMER_APP_DOST (0x0008)
45#define U300_TIMER_APP_DOST_TIMER_DISABLE (0x00000000)
46/* OS Timer Mode Register 32bit (-/W) */
47#define U300_TIMER_APP_SOSTM (0x000c)
48#define U300_TIMER_APP_SOSTM_MODE_CONTINUOUS (0x00000000)
49#define U300_TIMER_APP_SOSTM_MODE_ONE_SHOT (0x00000001)
50/* OS Timer Status Register 32bit (R/-) */
51#define U300_TIMER_APP_OSTS (0x0010)
52#define U300_TIMER_APP_OSTS_TIMER_STATE_MASK (0x0000000F)
53#define U300_TIMER_APP_OSTS_TIMER_STATE_IDLE (0x00000001)
54#define U300_TIMER_APP_OSTS_TIMER_STATE_ACTIVE (0x00000002)
55#define U300_TIMER_APP_OSTS_ENABLE_IND (0x00000010)
56#define U300_TIMER_APP_OSTS_MODE_MASK (0x00000020)
57#define U300_TIMER_APP_OSTS_MODE_CONTINUOUS (0x00000000)
58#define U300_TIMER_APP_OSTS_MODE_ONE_SHOT (0x00000020)
59#define U300_TIMER_APP_OSTS_IRQ_ENABLED_IND (0x00000040)
60#define U300_TIMER_APP_OSTS_IRQ_PENDING_IND (0x00000080)
61/* OS Timer Current Count Register 32bit (R/-) */
62#define U300_TIMER_APP_OSTCC (0x0014)
63/* OS Timer Terminal Count Register 32bit (R/W) */
64#define U300_TIMER_APP_OSTTC (0x0018)
65/* OS Timer Interrupt Enable Register 32bit (-/W) */
66#define U300_TIMER_APP_OSTIE (0x001c)
67#define U300_TIMER_APP_OSTIE_IRQ_DISABLE (0x00000000)
68#define U300_TIMER_APP_OSTIE_IRQ_ENABLE (0x00000001)
69/* OS Timer Interrupt Acknowledge Register 32bit (-/W) */
70#define U300_TIMER_APP_OSTIA (0x0020)
71#define U300_TIMER_APP_OSTIA_IRQ_ACK (0x00000080)
72
73/* Reset DD Timer 32bit (-/W) */
74#define U300_TIMER_APP_RDDT (0x0040)
75#define U300_TIMER_APP_RDDT_TIMER_RESET (0x00000000)
76/* Enable DD Timer 32bit (-/W) */
77#define U300_TIMER_APP_EDDT (0x0044)
78#define U300_TIMER_APP_EDDT_TIMER_ENABLE (0x00000000)
79/* Disable DD Timer 32bit (-/W) */
80#define U300_TIMER_APP_DDDT (0x0048)
81#define U300_TIMER_APP_DDDT_TIMER_DISABLE (0x00000000)
82/* DD Timer Mode Register 32bit (-/W) */
83#define U300_TIMER_APP_SDDTM (0x004c)
84#define U300_TIMER_APP_SDDTM_MODE_CONTINUOUS (0x00000000)
85#define U300_TIMER_APP_SDDTM_MODE_ONE_SHOT (0x00000001)
86/* DD Timer Status Register 32bit (R/-) */
87#define U300_TIMER_APP_DDTS (0x0050)
88#define U300_TIMER_APP_DDTS_TIMER_STATE_MASK (0x0000000F)
89#define U300_TIMER_APP_DDTS_TIMER_STATE_IDLE (0x00000001)
90#define U300_TIMER_APP_DDTS_TIMER_STATE_ACTIVE (0x00000002)
91#define U300_TIMER_APP_DDTS_ENABLE_IND (0x00000010)
92#define U300_TIMER_APP_DDTS_MODE_MASK (0x00000020)
93#define U300_TIMER_APP_DDTS_MODE_CONTINUOUS (0x00000000)
94#define U300_TIMER_APP_DDTS_MODE_ONE_SHOT (0x00000020)
95#define U300_TIMER_APP_DDTS_IRQ_ENABLED_IND (0x00000040)
96#define U300_TIMER_APP_DDTS_IRQ_PENDING_IND (0x00000080)
97/* DD Timer Current Count Register 32bit (R/-) */
98#define U300_TIMER_APP_DDTCC (0x0054)
99/* DD Timer Terminal Count Register 32bit (R/W) */
100#define U300_TIMER_APP_DDTTC (0x0058)
101/* DD Timer Interrupt Enable Register 32bit (-/W) */
102#define U300_TIMER_APP_DDTIE (0x005c)
103#define U300_TIMER_APP_DDTIE_IRQ_DISABLE (0x00000000)
104#define U300_TIMER_APP_DDTIE_IRQ_ENABLE (0x00000001)
105/* DD Timer Interrupt Acknowledge Register 32bit (-/W) */
106#define U300_TIMER_APP_DDTIA (0x0060)
107#define U300_TIMER_APP_DDTIA_IRQ_ACK (0x00000080)
108
109/* Reset GP1 Timer 32bit (-/W) */
110#define U300_TIMER_APP_RGPT1 (0x0080)
111#define U300_TIMER_APP_RGPT1_TIMER_RESET (0x00000000)
112/* Enable GP1 Timer 32bit (-/W) */
113#define U300_TIMER_APP_EGPT1 (0x0084)
114#define U300_TIMER_APP_EGPT1_TIMER_ENABLE (0x00000000)
115/* Disable GP1 Timer 32bit (-/W) */
116#define U300_TIMER_APP_DGPT1 (0x0088)
117#define U300_TIMER_APP_DGPT1_TIMER_DISABLE (0x00000000)
118/* GP1 Timer Mode Register 32bit (-/W) */
119#define U300_TIMER_APP_SGPT1M (0x008c)
120#define U300_TIMER_APP_SGPT1M_MODE_CONTINUOUS (0x00000000)
121#define U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT (0x00000001)
122/* GP1 Timer Status Register 32bit (R/-) */
123#define U300_TIMER_APP_GPT1S (0x0090)
124#define U300_TIMER_APP_GPT1S_TIMER_STATE_MASK (0x0000000F)
125#define U300_TIMER_APP_GPT1S_TIMER_STATE_IDLE (0x00000001)
126#define U300_TIMER_APP_GPT1S_TIMER_STATE_ACTIVE (0x00000002)
127#define U300_TIMER_APP_GPT1S_ENABLE_IND (0x00000010)
128#define U300_TIMER_APP_GPT1S_MODE_MASK (0x00000020)
129#define U300_TIMER_APP_GPT1S_MODE_CONTINUOUS (0x00000000)
130#define U300_TIMER_APP_GPT1S_MODE_ONE_SHOT (0x00000020)
131#define U300_TIMER_APP_GPT1S_IRQ_ENABLED_IND (0x00000040)
132#define U300_TIMER_APP_GPT1S_IRQ_PENDING_IND (0x00000080)
133/* GP1 Timer Current Count Register 32bit (R/-) */
134#define U300_TIMER_APP_GPT1CC (0x0094)
135/* GP1 Timer Terminal Count Register 32bit (R/W) */
136#define U300_TIMER_APP_GPT1TC (0x0098)
137/* GP1 Timer Interrupt Enable Register 32bit (-/W) */
138#define U300_TIMER_APP_GPT1IE (0x009c)
139#define U300_TIMER_APP_GPT1IE_IRQ_DISABLE (0x00000000)
140#define U300_TIMER_APP_GPT1IE_IRQ_ENABLE (0x00000001)
141/* GP1 Timer Interrupt Acknowledge Register 32bit (-/W) */
142#define U300_TIMER_APP_GPT1IA (0x00a0)
143#define U300_TIMER_APP_GPT1IA_IRQ_ACK (0x00000080)
144
145/* Reset GP2 Timer 32bit (-/W) */
146#define U300_TIMER_APP_RGPT2 (0x00c0)
147#define U300_TIMER_APP_RGPT2_TIMER_RESET (0x00000000)
148/* Enable GP2 Timer 32bit (-/W) */
149#define U300_TIMER_APP_EGPT2 (0x00c4)
150#define U300_TIMER_APP_EGPT2_TIMER_ENABLE (0x00000000)
151/* Disable GP2 Timer 32bit (-/W) */
152#define U300_TIMER_APP_DGPT2 (0x00c8)
153#define U300_TIMER_APP_DGPT2_TIMER_DISABLE (0x00000000)
154/* GP2 Timer Mode Register 32bit (-/W) */
155#define U300_TIMER_APP_SGPT2M (0x00cc)
156#define U300_TIMER_APP_SGPT2M_MODE_CONTINUOUS (0x00000000)
157#define U300_TIMER_APP_SGPT2M_MODE_ONE_SHOT (0x00000001)
158/* GP2 Timer Status Register 32bit (R/-) */
159#define U300_TIMER_APP_GPT2S (0x00d0)
160#define U300_TIMER_APP_GPT2S_TIMER_STATE_MASK (0x0000000F)
161#define U300_TIMER_APP_GPT2S_TIMER_STATE_IDLE (0x00000001)
162#define U300_TIMER_APP_GPT2S_TIMER_STATE_ACTIVE (0x00000002)
163#define U300_TIMER_APP_GPT2S_ENABLE_IND (0x00000010)
164#define U300_TIMER_APP_GPT2S_MODE_MASK (0x00000020)
165#define U300_TIMER_APP_GPT2S_MODE_CONTINUOUS (0x00000000)
166#define U300_TIMER_APP_GPT2S_MODE_ONE_SHOT (0x00000020)
167#define U300_TIMER_APP_GPT2S_IRQ_ENABLED_IND (0x00000040)
168#define U300_TIMER_APP_GPT2S_IRQ_PENDING_IND (0x00000080)
169/* GP2 Timer Current Count Register 32bit (R/-) */
170#define U300_TIMER_APP_GPT2CC (0x00d4)
171/* GP2 Timer Terminal Count Register 32bit (R/W) */
172#define U300_TIMER_APP_GPT2TC (0x00d8)
173/* GP2 Timer Interrupt Enable Register 32bit (-/W) */
174#define U300_TIMER_APP_GPT2IE (0x00dc)
175#define U300_TIMER_APP_GPT2IE_IRQ_DISABLE (0x00000000)
176#define U300_TIMER_APP_GPT2IE_IRQ_ENABLE (0x00000001)
177/* GP2 Timer Interrupt Acknowledge Register 32bit (-/W) */
178#define U300_TIMER_APP_GPT2IA (0x00e0)
179#define U300_TIMER_APP_GPT2IA_IRQ_ACK (0x00000080)
180
181/* Clock request control register - all four timers */
182#define U300_TIMER_APP_CRC (0x100)
183#define U300_TIMER_APP_CRC_CLOCK_REQUEST_ENABLE (0x00000001)
184
185#define TICKS_PER_JIFFY ((CLOCK_TICK_RATE + (HZ/2)) / HZ)
186#define US_PER_TICK ((1000000 + (HZ/2)) / HZ)
187
188/*
189 * The u300_set_mode() function is always called first, if we
190 * have oneshot timer active, the oneshot scheduling function
191 * u300_set_next_event() is called immediately after.
192 */
193static void u300_set_mode(enum clock_event_mode mode,
194 struct clock_event_device *evt)
195{
196 switch (mode) {
197 case CLOCK_EVT_MODE_PERIODIC:
198 /* Disable interrupts on GPT1 */
199 writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
200 U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
201 /* Disable GP1 while we're reprogramming it. */
202 writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
203 U300_TIMER_APP_VBASE + U300_TIMER_APP_DGPT1);
204 /*
205 * Set the periodic mode to a certain number of ticks per
206 * jiffy.
207 */
208 writel(TICKS_PER_JIFFY,
209 U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1TC);
210 /*
211 * Set continuous mode, so the timer keeps triggering
212 * interrupts.
213 */
214 writel(U300_TIMER_APP_SGPT1M_MODE_CONTINUOUS,
215 U300_TIMER_APP_VBASE + U300_TIMER_APP_SGPT1M);
216 /* Enable timer interrupts */
217 writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
218 U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
219 /* Then enable the OS timer again */
220 writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
221 U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT1);
222 break;
223 case CLOCK_EVT_MODE_ONESHOT:
224 /* Just break; here? */
225 /*
226 * The actual event will be programmed by the next event hook,
227 * so we just set a dummy value somewhere at the end of the
228 * universe here.
229 */
230 /* Disable interrupts on GPT1 */
231 writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
232 U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
233 /* Disable GP1 while we're reprogramming it. */
234 writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
235 U300_TIMER_APP_VBASE + U300_TIMER_APP_DGPT1);
236 /*
237 * Expire far in the future, u300_set_next_event() will be
238 * called soon...
239 */
240 writel(0xFFFFFFFF, U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1TC);
241 /* We run one shot per tick here! */
242 writel(U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT,
243 U300_TIMER_APP_VBASE + U300_TIMER_APP_SGPT1M);
244 /* Enable interrupts for this timer */
245 writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
246 U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
247 /* Enable timer */
248 writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
249 U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT1);
250 break;
251 case CLOCK_EVT_MODE_UNUSED:
252 case CLOCK_EVT_MODE_SHUTDOWN:
253 /* Disable interrupts on GP1 */
254 writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
255 U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
256 /* Disable GP1 */
257 writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
258 U300_TIMER_APP_VBASE + U300_TIMER_APP_DGPT1);
259 break;
260 case CLOCK_EVT_MODE_RESUME:
261 /* Ignore this call */
262 break;
263 }
264}
265
266/*
267 * The app timer in one shot mode obviously has to be reprogrammed
268 * in EXACTLY this sequence to work properly. Do NOT try to e.g. replace
269 * the interrupt disable + timer disable commands with a reset command,
270 * it will fail miserably. Apparently (and I found this the hard way)
271 * the timer is very sensitive to the instruction order, though you don't
272 * get that impression from the data sheet.
273 */
274static int u300_set_next_event(unsigned long cycles,
275 struct clock_event_device *evt)
276
277{
278 /* Disable interrupts on GPT1 */
279 writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
280 U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
281 /* Disable GP1 while we're reprogramming it. */
282 writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
283 U300_TIMER_APP_VBASE + U300_TIMER_APP_DGPT1);
284 /* Reset the General Purpose timer 1. */
285 writel(U300_TIMER_APP_RGPT1_TIMER_RESET,
286 U300_TIMER_APP_VBASE + U300_TIMER_APP_RGPT1);
287 /* IRQ in n * cycles */
288 writel(cycles, U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1TC);
289 /*
290 * We run one shot per tick here! (This is necessary to reconfigure,
291 * the timer will tilt if you don't!)
292 */
293 writel(U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT,
294 U300_TIMER_APP_VBASE + U300_TIMER_APP_SGPT1M);
295 /* Enable timer interrupts */
296 writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
297 U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
298 /* Then enable the OS timer again */
299 writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
300 U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT1);
301 return 0;
302}
303
304
305/* Use general purpose timer 1 as clock event */
306static struct clock_event_device clockevent_u300_1mhz = {
307 .name = "GPT1",
308 .rating = 300, /* Reasonably fast and accurate clock event */
309 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
310 /* 22 calculated using the algorithm in arch/mips/kernel/time.c */
311 .shift = 22,
312 .set_next_event = u300_set_next_event,
313 .set_mode = u300_set_mode,
314};
315
316/* Clock event timer interrupt handler */
317static irqreturn_t u300_timer_interrupt(int irq, void *dev_id)
318{
319 struct clock_event_device *evt = &clockevent_u300_1mhz;
320 /* ACK/Clear timer IRQ for the APP GPT1 Timer */
321 writel(U300_TIMER_APP_GPT1IA_IRQ_ACK,
322 U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IA);
323 evt->event_handler(evt);
324 return IRQ_HANDLED;
325}
326
327static struct irqaction u300_timer_irq = {
328 .name = "U300 Timer Tick",
329 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
330 .handler = u300_timer_interrupt,
331};
332
333/* Use general purpose timer 2 as clock source */
334static cycle_t u300_get_cycles(struct clocksource *cs)
335{
336 return (cycles_t) readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC);
337}
338
339static struct clocksource clocksource_u300_1mhz = {
340 .name = "GPT2",
341 .rating = 300, /* Reasonably fast and accurate clock source */
342 .read = u300_get_cycles,
343 .mask = CLOCKSOURCE_MASK(32), /* 32 bits */
344 /* 22 calculated using the algorithm in arch/mips/kernel/time.c */
345 .shift = 22,
346 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
347};
348
349
350/*
351 * This sets up the system timers, clock source and clock event.
352 */
353static void __init u300_timer_init(void)
354{
355 u300_enable_timer_clock();
356 /*
357 * Disable the "OS" and "DD" timers - these are designed for Symbian!
358 * Example usage in cnh1601578 cpu subsystem pd_timer_app.c
359 */
360 writel(U300_TIMER_APP_CRC_CLOCK_REQUEST_ENABLE,
361 U300_TIMER_APP_VBASE + U300_TIMER_APP_CRC);
362 writel(U300_TIMER_APP_ROST_TIMER_RESET,
363 U300_TIMER_APP_VBASE + U300_TIMER_APP_ROST);
364 writel(U300_TIMER_APP_DOST_TIMER_DISABLE,
365 U300_TIMER_APP_VBASE + U300_TIMER_APP_DOST);
366 writel(U300_TIMER_APP_RDDT_TIMER_RESET,
367 U300_TIMER_APP_VBASE + U300_TIMER_APP_RDDT);
368 writel(U300_TIMER_APP_DDDT_TIMER_DISABLE,
369 U300_TIMER_APP_VBASE + U300_TIMER_APP_DDDT);
370
371 /* Reset the General Purpose timer 1. */
372 writel(U300_TIMER_APP_RGPT1_TIMER_RESET,
373 U300_TIMER_APP_VBASE + U300_TIMER_APP_RGPT1);
374
375 /* Set up the IRQ handler */
376 setup_irq(IRQ_U300_TIMER_APP_GP1, &u300_timer_irq);
377
378 /* Reset the General Purpose timer 2 */
379 writel(U300_TIMER_APP_RGPT2_TIMER_RESET,
380 U300_TIMER_APP_VBASE + U300_TIMER_APP_RGPT2);
381 /* Set this timer to run around forever */
382 writel(0xFFFFFFFFU, U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2TC);
383 /* Set continuous mode so it wraps around */
384 writel(U300_TIMER_APP_SGPT2M_MODE_CONTINUOUS,
385 U300_TIMER_APP_VBASE + U300_TIMER_APP_SGPT2M);
386 /* Disable timer interrupts */
387 writel(U300_TIMER_APP_GPT2IE_IRQ_DISABLE,
388 U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2IE);
389 /* Then enable the GP2 timer to use as a free running us counter */
390 writel(U300_TIMER_APP_EGPT2_TIMER_ENABLE,
391 U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT2);
392
393 /* This is a pure microsecond clock source */
394 clocksource_u300_1mhz.mult =
395 clocksource_khz2mult(1000, clocksource_u300_1mhz.shift);
396 if (clocksource_register(&clocksource_u300_1mhz))
397 printk(KERN_ERR "timer: failed to initialize clock "
398 "source %s\n", clocksource_u300_1mhz.name);
399
400 clockevent_u300_1mhz.mult =
401 div_sc(1000000, NSEC_PER_SEC, clockevent_u300_1mhz.shift);
402 /* 32bit counter, so 32bits delta is max */
403 clockevent_u300_1mhz.max_delta_ns =
404 clockevent_delta2ns(0xffffffff, &clockevent_u300_1mhz);
405 /* This timer is slow enough to set for 1 cycle == 1 MHz */
406 clockevent_u300_1mhz.min_delta_ns =
407 clockevent_delta2ns(1, &clockevent_u300_1mhz);
408 clockevent_u300_1mhz.cpumask = cpumask_of(0);
409 clockevents_register_device(&clockevent_u300_1mhz);
410 /*
411 * TODO: init and register the rest of the timers too, they can be
412 * used by hrtimers!
413 */
414}
415
416/*
417 * Very simple system timer that only register the clock event and
418 * clock source.
419 */
420struct sys_timer u300_timer = {
421 .init = u300_timer_init,
422};
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