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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 | #include <linux/clk.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/irq.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/of_address.h> | |
23 | #include <linux/of_irq.h> | |
24 | #include <linux/sched_clock.h> | |
25 | ||
26 | /* Generic stuff */ | |
27 | #include <asm/mach/map.h> | |
28 | #include <asm/mach/time.h> | |
29 | ||
30 | /* | |
31 | * APP side special timer registers | |
32 | * This timer contains four timers which can fire an interrupt each. | |
33 | * OS (operating system) timer @ 32768 Hz | |
34 | * DD (device driver) timer @ 1 kHz | |
35 | * GP1 (general purpose 1) timer @ 1MHz | |
36 | * GP2 (general purpose 2) timer @ 1MHz | |
37 | */ | |
38 | ||
39 | /* Reset OS Timer 32bit (-/W) */ | |
40 | #define U300_TIMER_APP_ROST (0x0000) | |
41 | #define U300_TIMER_APP_ROST_TIMER_RESET (0x00000000) | |
42 | /* Enable OS Timer 32bit (-/W) */ | |
43 | #define U300_TIMER_APP_EOST (0x0004) | |
44 | #define U300_TIMER_APP_EOST_TIMER_ENABLE (0x00000000) | |
45 | /* Disable OS Timer 32bit (-/W) */ | |
46 | #define U300_TIMER_APP_DOST (0x0008) | |
47 | #define U300_TIMER_APP_DOST_TIMER_DISABLE (0x00000000) | |
48 | /* OS Timer Mode Register 32bit (-/W) */ | |
49 | #define U300_TIMER_APP_SOSTM (0x000c) | |
50 | #define U300_TIMER_APP_SOSTM_MODE_CONTINUOUS (0x00000000) | |
51 | #define U300_TIMER_APP_SOSTM_MODE_ONE_SHOT (0x00000001) | |
52 | /* OS Timer Status Register 32bit (R/-) */ | |
53 | #define U300_TIMER_APP_OSTS (0x0010) | |
54 | #define U300_TIMER_APP_OSTS_TIMER_STATE_MASK (0x0000000F) | |
55 | #define U300_TIMER_APP_OSTS_TIMER_STATE_IDLE (0x00000001) | |
56 | #define U300_TIMER_APP_OSTS_TIMER_STATE_ACTIVE (0x00000002) | |
57 | #define U300_TIMER_APP_OSTS_ENABLE_IND (0x00000010) | |
58 | #define U300_TIMER_APP_OSTS_MODE_MASK (0x00000020) | |
59 | #define U300_TIMER_APP_OSTS_MODE_CONTINUOUS (0x00000000) | |
60 | #define U300_TIMER_APP_OSTS_MODE_ONE_SHOT (0x00000020) | |
61 | #define U300_TIMER_APP_OSTS_IRQ_ENABLED_IND (0x00000040) | |
62 | #define U300_TIMER_APP_OSTS_IRQ_PENDING_IND (0x00000080) | |
63 | /* OS Timer Current Count Register 32bit (R/-) */ | |
64 | #define U300_TIMER_APP_OSTCC (0x0014) | |
65 | /* OS Timer Terminal Count Register 32bit (R/W) */ | |
66 | #define U300_TIMER_APP_OSTTC (0x0018) | |
67 | /* OS Timer Interrupt Enable Register 32bit (-/W) */ | |
68 | #define U300_TIMER_APP_OSTIE (0x001c) | |
69 | #define U300_TIMER_APP_OSTIE_IRQ_DISABLE (0x00000000) | |
70 | #define U300_TIMER_APP_OSTIE_IRQ_ENABLE (0x00000001) | |
71 | /* OS Timer Interrupt Acknowledge Register 32bit (-/W) */ | |
72 | #define U300_TIMER_APP_OSTIA (0x0020) | |
73 | #define U300_TIMER_APP_OSTIA_IRQ_ACK (0x00000080) | |
74 | ||
75 | /* Reset DD Timer 32bit (-/W) */ | |
76 | #define U300_TIMER_APP_RDDT (0x0040) | |
77 | #define U300_TIMER_APP_RDDT_TIMER_RESET (0x00000000) | |
78 | /* Enable DD Timer 32bit (-/W) */ | |
79 | #define U300_TIMER_APP_EDDT (0x0044) | |
80 | #define U300_TIMER_APP_EDDT_TIMER_ENABLE (0x00000000) | |
81 | /* Disable DD Timer 32bit (-/W) */ | |
82 | #define U300_TIMER_APP_DDDT (0x0048) | |
83 | #define U300_TIMER_APP_DDDT_TIMER_DISABLE (0x00000000) | |
84 | /* DD Timer Mode Register 32bit (-/W) */ | |
85 | #define U300_TIMER_APP_SDDTM (0x004c) | |
86 | #define U300_TIMER_APP_SDDTM_MODE_CONTINUOUS (0x00000000) | |
87 | #define U300_TIMER_APP_SDDTM_MODE_ONE_SHOT (0x00000001) | |
88 | /* DD Timer Status Register 32bit (R/-) */ | |
89 | #define U300_TIMER_APP_DDTS (0x0050) | |
90 | #define U300_TIMER_APP_DDTS_TIMER_STATE_MASK (0x0000000F) | |
91 | #define U300_TIMER_APP_DDTS_TIMER_STATE_IDLE (0x00000001) | |
92 | #define U300_TIMER_APP_DDTS_TIMER_STATE_ACTIVE (0x00000002) | |
93 | #define U300_TIMER_APP_DDTS_ENABLE_IND (0x00000010) | |
94 | #define U300_TIMER_APP_DDTS_MODE_MASK (0x00000020) | |
95 | #define U300_TIMER_APP_DDTS_MODE_CONTINUOUS (0x00000000) | |
96 | #define U300_TIMER_APP_DDTS_MODE_ONE_SHOT (0x00000020) | |
97 | #define U300_TIMER_APP_DDTS_IRQ_ENABLED_IND (0x00000040) | |
98 | #define U300_TIMER_APP_DDTS_IRQ_PENDING_IND (0x00000080) | |
99 | /* DD Timer Current Count Register 32bit (R/-) */ | |
100 | #define U300_TIMER_APP_DDTCC (0x0054) | |
101 | /* DD Timer Terminal Count Register 32bit (R/W) */ | |
102 | #define U300_TIMER_APP_DDTTC (0x0058) | |
103 | /* DD Timer Interrupt Enable Register 32bit (-/W) */ | |
104 | #define U300_TIMER_APP_DDTIE (0x005c) | |
105 | #define U300_TIMER_APP_DDTIE_IRQ_DISABLE (0x00000000) | |
106 | #define U300_TIMER_APP_DDTIE_IRQ_ENABLE (0x00000001) | |
107 | /* DD Timer Interrupt Acknowledge Register 32bit (-/W) */ | |
108 | #define U300_TIMER_APP_DDTIA (0x0060) | |
109 | #define U300_TIMER_APP_DDTIA_IRQ_ACK (0x00000080) | |
110 | ||
111 | /* Reset GP1 Timer 32bit (-/W) */ | |
112 | #define U300_TIMER_APP_RGPT1 (0x0080) | |
113 | #define U300_TIMER_APP_RGPT1_TIMER_RESET (0x00000000) | |
114 | /* Enable GP1 Timer 32bit (-/W) */ | |
115 | #define U300_TIMER_APP_EGPT1 (0x0084) | |
116 | #define U300_TIMER_APP_EGPT1_TIMER_ENABLE (0x00000000) | |
117 | /* Disable GP1 Timer 32bit (-/W) */ | |
118 | #define U300_TIMER_APP_DGPT1 (0x0088) | |
119 | #define U300_TIMER_APP_DGPT1_TIMER_DISABLE (0x00000000) | |
120 | /* GP1 Timer Mode Register 32bit (-/W) */ | |
121 | #define U300_TIMER_APP_SGPT1M (0x008c) | |
122 | #define U300_TIMER_APP_SGPT1M_MODE_CONTINUOUS (0x00000000) | |
123 | #define U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT (0x00000001) | |
124 | /* GP1 Timer Status Register 32bit (R/-) */ | |
125 | #define U300_TIMER_APP_GPT1S (0x0090) | |
126 | #define U300_TIMER_APP_GPT1S_TIMER_STATE_MASK (0x0000000F) | |
127 | #define U300_TIMER_APP_GPT1S_TIMER_STATE_IDLE (0x00000001) | |
128 | #define U300_TIMER_APP_GPT1S_TIMER_STATE_ACTIVE (0x00000002) | |
129 | #define U300_TIMER_APP_GPT1S_ENABLE_IND (0x00000010) | |
130 | #define U300_TIMER_APP_GPT1S_MODE_MASK (0x00000020) | |
131 | #define U300_TIMER_APP_GPT1S_MODE_CONTINUOUS (0x00000000) | |
132 | #define U300_TIMER_APP_GPT1S_MODE_ONE_SHOT (0x00000020) | |
133 | #define U300_TIMER_APP_GPT1S_IRQ_ENABLED_IND (0x00000040) | |
134 | #define U300_TIMER_APP_GPT1S_IRQ_PENDING_IND (0x00000080) | |
135 | /* GP1 Timer Current Count Register 32bit (R/-) */ | |
136 | #define U300_TIMER_APP_GPT1CC (0x0094) | |
137 | /* GP1 Timer Terminal Count Register 32bit (R/W) */ | |
138 | #define U300_TIMER_APP_GPT1TC (0x0098) | |
139 | /* GP1 Timer Interrupt Enable Register 32bit (-/W) */ | |
140 | #define U300_TIMER_APP_GPT1IE (0x009c) | |
141 | #define U300_TIMER_APP_GPT1IE_IRQ_DISABLE (0x00000000) | |
142 | #define U300_TIMER_APP_GPT1IE_IRQ_ENABLE (0x00000001) | |
143 | /* GP1 Timer Interrupt Acknowledge Register 32bit (-/W) */ | |
144 | #define U300_TIMER_APP_GPT1IA (0x00a0) | |
145 | #define U300_TIMER_APP_GPT1IA_IRQ_ACK (0x00000080) | |
146 | ||
147 | /* Reset GP2 Timer 32bit (-/W) */ | |
148 | #define U300_TIMER_APP_RGPT2 (0x00c0) | |
149 | #define U300_TIMER_APP_RGPT2_TIMER_RESET (0x00000000) | |
150 | /* Enable GP2 Timer 32bit (-/W) */ | |
151 | #define U300_TIMER_APP_EGPT2 (0x00c4) | |
152 | #define U300_TIMER_APP_EGPT2_TIMER_ENABLE (0x00000000) | |
153 | /* Disable GP2 Timer 32bit (-/W) */ | |
154 | #define U300_TIMER_APP_DGPT2 (0x00c8) | |
155 | #define U300_TIMER_APP_DGPT2_TIMER_DISABLE (0x00000000) | |
156 | /* GP2 Timer Mode Register 32bit (-/W) */ | |
157 | #define U300_TIMER_APP_SGPT2M (0x00cc) | |
158 | #define U300_TIMER_APP_SGPT2M_MODE_CONTINUOUS (0x00000000) | |
159 | #define U300_TIMER_APP_SGPT2M_MODE_ONE_SHOT (0x00000001) | |
160 | /* GP2 Timer Status Register 32bit (R/-) */ | |
161 | #define U300_TIMER_APP_GPT2S (0x00d0) | |
162 | #define U300_TIMER_APP_GPT2S_TIMER_STATE_MASK (0x0000000F) | |
163 | #define U300_TIMER_APP_GPT2S_TIMER_STATE_IDLE (0x00000001) | |
164 | #define U300_TIMER_APP_GPT2S_TIMER_STATE_ACTIVE (0x00000002) | |
165 | #define U300_TIMER_APP_GPT2S_ENABLE_IND (0x00000010) | |
166 | #define U300_TIMER_APP_GPT2S_MODE_MASK (0x00000020) | |
167 | #define U300_TIMER_APP_GPT2S_MODE_CONTINUOUS (0x00000000) | |
168 | #define U300_TIMER_APP_GPT2S_MODE_ONE_SHOT (0x00000020) | |
169 | #define U300_TIMER_APP_GPT2S_IRQ_ENABLED_IND (0x00000040) | |
170 | #define U300_TIMER_APP_GPT2S_IRQ_PENDING_IND (0x00000080) | |
171 | /* GP2 Timer Current Count Register 32bit (R/-) */ | |
172 | #define U300_TIMER_APP_GPT2CC (0x00d4) | |
173 | /* GP2 Timer Terminal Count Register 32bit (R/W) */ | |
174 | #define U300_TIMER_APP_GPT2TC (0x00d8) | |
175 | /* GP2 Timer Interrupt Enable Register 32bit (-/W) */ | |
176 | #define U300_TIMER_APP_GPT2IE (0x00dc) | |
177 | #define U300_TIMER_APP_GPT2IE_IRQ_DISABLE (0x00000000) | |
178 | #define U300_TIMER_APP_GPT2IE_IRQ_ENABLE (0x00000001) | |
179 | /* GP2 Timer Interrupt Acknowledge Register 32bit (-/W) */ | |
180 | #define U300_TIMER_APP_GPT2IA (0x00e0) | |
181 | #define U300_TIMER_APP_GPT2IA_IRQ_ACK (0x00000080) | |
182 | ||
183 | /* Clock request control register - all four timers */ | |
184 | #define U300_TIMER_APP_CRC (0x100) | |
185 | #define U300_TIMER_APP_CRC_CLOCK_REQUEST_ENABLE (0x00000001) | |
186 | ||
187 | #define TICKS_PER_JIFFY ((CLOCK_TICK_RATE + (HZ/2)) / HZ) | |
188 | #define US_PER_TICK ((1000000 + (HZ/2)) / HZ) | |
189 | ||
190 | static void __iomem *u300_timer_base; | |
191 | ||
192 | /* | |
193 | * The u300_set_mode() function is always called first, if we | |
194 | * have oneshot timer active, the oneshot scheduling function | |
195 | * u300_set_next_event() is called immediately after. | |
196 | */ | |
197 | static void u300_set_mode(enum clock_event_mode mode, | |
198 | struct clock_event_device *evt) | |
199 | { | |
200 | switch (mode) { | |
201 | case CLOCK_EVT_MODE_PERIODIC: | |
202 | /* Disable interrupts on GPT1 */ | |
203 | writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE, | |
204 | u300_timer_base + U300_TIMER_APP_GPT1IE); | |
205 | /* Disable GP1 while we're reprogramming it. */ | |
206 | writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE, | |
207 | u300_timer_base + U300_TIMER_APP_DGPT1); | |
208 | /* | |
209 | * Set the periodic mode to a certain number of ticks per | |
210 | * jiffy. | |
211 | */ | |
212 | writel(TICKS_PER_JIFFY, | |
213 | u300_timer_base + U300_TIMER_APP_GPT1TC); | |
214 | /* | |
215 | * Set continuous mode, so the timer keeps triggering | |
216 | * interrupts. | |
217 | */ | |
218 | writel(U300_TIMER_APP_SGPT1M_MODE_CONTINUOUS, | |
219 | u300_timer_base + U300_TIMER_APP_SGPT1M); | |
220 | /* Enable timer interrupts */ | |
221 | writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE, | |
222 | u300_timer_base + U300_TIMER_APP_GPT1IE); | |
223 | /* Then enable the OS timer again */ | |
224 | writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE, | |
225 | u300_timer_base + U300_TIMER_APP_EGPT1); | |
226 | break; | |
227 | case CLOCK_EVT_MODE_ONESHOT: | |
228 | /* Just break; here? */ | |
229 | /* | |
230 | * The actual event will be programmed by the next event hook, | |
231 | * so we just set a dummy value somewhere at the end of the | |
232 | * universe here. | |
233 | */ | |
234 | /* Disable interrupts on GPT1 */ | |
235 | writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE, | |
236 | u300_timer_base + U300_TIMER_APP_GPT1IE); | |
237 | /* Disable GP1 while we're reprogramming it. */ | |
238 | writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE, | |
239 | u300_timer_base + U300_TIMER_APP_DGPT1); | |
240 | /* | |
241 | * Expire far in the future, u300_set_next_event() will be | |
242 | * called soon... | |
243 | */ | |
244 | writel(0xFFFFFFFF, u300_timer_base + U300_TIMER_APP_GPT1TC); | |
245 | /* We run one shot per tick here! */ | |
246 | writel(U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT, | |
247 | u300_timer_base + U300_TIMER_APP_SGPT1M); | |
248 | /* Enable interrupts for this timer */ | |
249 | writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE, | |
250 | u300_timer_base + U300_TIMER_APP_GPT1IE); | |
251 | /* Enable timer */ | |
252 | writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE, | |
253 | u300_timer_base + U300_TIMER_APP_EGPT1); | |
254 | break; | |
255 | case CLOCK_EVT_MODE_UNUSED: | |
256 | case CLOCK_EVT_MODE_SHUTDOWN: | |
257 | /* Disable interrupts on GP1 */ | |
258 | writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE, | |
259 | u300_timer_base + U300_TIMER_APP_GPT1IE); | |
260 | /* Disable GP1 */ | |
261 | writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE, | |
262 | u300_timer_base + U300_TIMER_APP_DGPT1); | |
263 | break; | |
264 | case CLOCK_EVT_MODE_RESUME: | |
265 | /* Ignore this call */ | |
266 | break; | |
267 | } | |
268 | } | |
269 | ||
270 | /* | |
271 | * The app timer in one shot mode obviously has to be reprogrammed | |
272 | * in EXACTLY this sequence to work properly. Do NOT try to e.g. replace | |
273 | * the interrupt disable + timer disable commands with a reset command, | |
274 | * it will fail miserably. Apparently (and I found this the hard way) | |
275 | * the timer is very sensitive to the instruction order, though you don't | |
276 | * get that impression from the data sheet. | |
277 | */ | |
278 | static int u300_set_next_event(unsigned long cycles, | |
279 | struct clock_event_device *evt) | |
280 | ||
281 | { | |
282 | /* Disable interrupts on GPT1 */ | |
283 | writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE, | |
284 | u300_timer_base + U300_TIMER_APP_GPT1IE); | |
285 | /* Disable GP1 while we're reprogramming it. */ | |
286 | writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE, | |
287 | u300_timer_base + U300_TIMER_APP_DGPT1); | |
288 | /* Reset the General Purpose timer 1. */ | |
289 | writel(U300_TIMER_APP_RGPT1_TIMER_RESET, | |
290 | u300_timer_base + U300_TIMER_APP_RGPT1); | |
291 | /* IRQ in n * cycles */ | |
292 | writel(cycles, u300_timer_base + U300_TIMER_APP_GPT1TC); | |
293 | /* | |
294 | * We run one shot per tick here! (This is necessary to reconfigure, | |
295 | * the timer will tilt if you don't!) | |
296 | */ | |
297 | writel(U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT, | |
298 | u300_timer_base + U300_TIMER_APP_SGPT1M); | |
299 | /* Enable timer interrupts */ | |
300 | writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE, | |
301 | u300_timer_base + U300_TIMER_APP_GPT1IE); | |
302 | /* Then enable the OS timer again */ | |
303 | writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE, | |
304 | u300_timer_base + U300_TIMER_APP_EGPT1); | |
305 | return 0; | |
306 | } | |
307 | ||
308 | ||
309 | /* Use general purpose timer 1 as clock event */ | |
310 | static struct clock_event_device clockevent_u300_1mhz = { | |
311 | .name = "GPT1", | |
312 | .rating = 300, /* Reasonably fast and accurate clock event */ | |
313 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, | |
314 | .set_next_event = u300_set_next_event, | |
315 | .set_mode = u300_set_mode, | |
316 | }; | |
317 | ||
318 | /* Clock event timer interrupt handler */ | |
319 | static irqreturn_t u300_timer_interrupt(int irq, void *dev_id) | |
320 | { | |
321 | struct clock_event_device *evt = &clockevent_u300_1mhz; | |
322 | /* ACK/Clear timer IRQ for the APP GPT1 Timer */ | |
323 | ||
324 | writel(U300_TIMER_APP_GPT1IA_IRQ_ACK, | |
325 | u300_timer_base + U300_TIMER_APP_GPT1IA); | |
326 | evt->event_handler(evt); | |
327 | return IRQ_HANDLED; | |
328 | } | |
329 | ||
330 | static struct irqaction u300_timer_irq = { | |
331 | .name = "U300 Timer Tick", | |
332 | .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, | |
333 | .handler = u300_timer_interrupt, | |
334 | }; | |
335 | ||
336 | /* | |
337 | * Override the global weak sched_clock symbol with this | |
338 | * local implementation which uses the clocksource to get some | |
339 | * better resolution when scheduling the kernel. We accept that | |
340 | * this wraps around for now, since it is just a relative time | |
341 | * stamp. (Inspired by OMAP implementation.) | |
342 | */ | |
343 | ||
344 | static u32 notrace u300_read_sched_clock(void) | |
345 | { | |
346 | return readl(u300_timer_base + U300_TIMER_APP_GPT2CC); | |
347 | } | |
348 | ||
349 | static unsigned long u300_read_current_timer(void) | |
350 | { | |
351 | return readl(u300_timer_base + U300_TIMER_APP_GPT2CC); | |
352 | } | |
353 | ||
354 | static struct delay_timer u300_delay_timer; | |
355 | ||
356 | /* | |
357 | * This sets up the system timers, clock source and clock event. | |
358 | */ | |
359 | static void __init u300_timer_init_of(struct device_node *np) | |
360 | { | |
361 | struct resource irq_res; | |
362 | int irq; | |
363 | struct clk *clk; | |
364 | unsigned long rate; | |
365 | ||
366 | u300_timer_base = of_iomap(np, 0); | |
367 | if (!u300_timer_base) | |
368 | panic("could not ioremap system timer\n"); | |
369 | ||
370 | /* Get the IRQ for the GP1 timer */ | |
371 | irq = of_irq_to_resource(np, 2, &irq_res); | |
372 | if (irq <= 0) | |
373 | panic("no IRQ for system timer\n"); | |
374 | ||
375 | pr_info("U300 GP1 timer @ base: %p, IRQ: %d\n", u300_timer_base, irq); | |
376 | ||
377 | /* Clock the interrupt controller */ | |
378 | clk = of_clk_get(np, 0); | |
379 | BUG_ON(IS_ERR(clk)); | |
380 | clk_prepare_enable(clk); | |
381 | rate = clk_get_rate(clk); | |
382 | ||
383 | setup_sched_clock(u300_read_sched_clock, 32, rate); | |
384 | ||
385 | u300_delay_timer.read_current_timer = &u300_read_current_timer; | |
386 | u300_delay_timer.freq = rate; | |
387 | register_current_timer_delay(&u300_delay_timer); | |
388 | ||
389 | /* | |
390 | * Disable the "OS" and "DD" timers - these are designed for Symbian! | |
391 | * Example usage in cnh1601578 cpu subsystem pd_timer_app.c | |
392 | */ | |
393 | writel(U300_TIMER_APP_CRC_CLOCK_REQUEST_ENABLE, | |
394 | u300_timer_base + U300_TIMER_APP_CRC); | |
395 | writel(U300_TIMER_APP_ROST_TIMER_RESET, | |
396 | u300_timer_base + U300_TIMER_APP_ROST); | |
397 | writel(U300_TIMER_APP_DOST_TIMER_DISABLE, | |
398 | u300_timer_base + U300_TIMER_APP_DOST); | |
399 | writel(U300_TIMER_APP_RDDT_TIMER_RESET, | |
400 | u300_timer_base + U300_TIMER_APP_RDDT); | |
401 | writel(U300_TIMER_APP_DDDT_TIMER_DISABLE, | |
402 | u300_timer_base + U300_TIMER_APP_DDDT); | |
403 | ||
404 | /* Reset the General Purpose timer 1. */ | |
405 | writel(U300_TIMER_APP_RGPT1_TIMER_RESET, | |
406 | u300_timer_base + U300_TIMER_APP_RGPT1); | |
407 | ||
408 | /* Set up the IRQ handler */ | |
409 | setup_irq(irq, &u300_timer_irq); | |
410 | ||
411 | /* Reset the General Purpose timer 2 */ | |
412 | writel(U300_TIMER_APP_RGPT2_TIMER_RESET, | |
413 | u300_timer_base + U300_TIMER_APP_RGPT2); | |
414 | /* Set this timer to run around forever */ | |
415 | writel(0xFFFFFFFFU, u300_timer_base + U300_TIMER_APP_GPT2TC); | |
416 | /* Set continuous mode so it wraps around */ | |
417 | writel(U300_TIMER_APP_SGPT2M_MODE_CONTINUOUS, | |
418 | u300_timer_base + U300_TIMER_APP_SGPT2M); | |
419 | /* Disable timer interrupts */ | |
420 | writel(U300_TIMER_APP_GPT2IE_IRQ_DISABLE, | |
421 | u300_timer_base + U300_TIMER_APP_GPT2IE); | |
422 | /* Then enable the GP2 timer to use as a free running us counter */ | |
423 | writel(U300_TIMER_APP_EGPT2_TIMER_ENABLE, | |
424 | u300_timer_base + U300_TIMER_APP_EGPT2); | |
425 | ||
426 | /* Use general purpose timer 2 as clock source */ | |
427 | if (clocksource_mmio_init(u300_timer_base + U300_TIMER_APP_GPT2CC, | |
428 | "GPT2", rate, 300, 32, clocksource_mmio_readl_up)) | |
429 | pr_err("timer: failed to initialize U300 clock source\n"); | |
430 | ||
431 | /* Configure and register the clockevent */ | |
432 | clockevents_config_and_register(&clockevent_u300_1mhz, rate, | |
433 | 1, 0xffffffff); | |
434 | ||
435 | /* | |
436 | * TODO: init and register the rest of the timers too, they can be | |
437 | * used by hrtimers! | |
438 | */ | |
439 | } | |
440 | ||
441 | CLOCKSOURCE_OF_DECLARE(u300_timer, "stericsson,u300-apptimer", | |
442 | u300_timer_init_of); |