1 /*
2 * OMAP Dual-Mode Timers
3 *
4 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
5 * Tarun Kanti DebBarma <tarun.kanti@ti.com>
6 * Thara Gopinath <thara@ti.com>
7 *
8 * Platform device conversion and hwmod support.
9 *
10 * Copyright (C) 2005 Nokia Corporation
11 * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
12 * PWM and clock framwork support by Timo Teras.
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2 of the License, or (at your
17 * option) any later version.
18 *
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
22 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * You should have received a copy of the GNU General Public License along
29 * with this program; if not, write to the Free Software Foundation, Inc.,
30 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 */
32
33 #include <linux/delay.h>
34 #include <linux/io.h>
35 #include <linux/platform_device.h>
36
37 #ifndef __CLOCKSOURCE_DMTIMER_H
38 #define __CLOCKSOURCE_DMTIMER_H
39
40 /* clock sources */
41 #define OMAP_TIMER_SRC_SYS_CLK 0x00
42 #define OMAP_TIMER_SRC_32_KHZ 0x01
43 #define OMAP_TIMER_SRC_EXT_CLK 0x02
44
45 /* timer interrupt enable bits */
46 #define OMAP_TIMER_INT_CAPTURE (1 << 2)
47 #define OMAP_TIMER_INT_OVERFLOW (1 << 1)
48 #define OMAP_TIMER_INT_MATCH (1 << 0)
49
50 /* trigger types */
51 #define OMAP_TIMER_TRIGGER_NONE 0x00
52 #define OMAP_TIMER_TRIGGER_OVERFLOW 0x01
53 #define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE 0x02
54
55 /* posted mode types */
56 #define OMAP_TIMER_NONPOSTED 0x00
57 #define OMAP_TIMER_POSTED 0x01
58
59 /* timer capabilities used in hwmod database */
60 #define OMAP_TIMER_SECURE 0x80000000
61 #define OMAP_TIMER_ALWON 0x40000000
62 #define OMAP_TIMER_HAS_PWM 0x20000000
63 #define OMAP_TIMER_NEEDS_RESET 0x10000000
64 #define OMAP_TIMER_HAS_DSP_IRQ 0x08000000
65
66 /*
67 * timer errata flags
68 *
69 * Errata i103/i767 impacts all OMAP3/4/5 devices including AM33xx. This
70 * errata prevents us from using posted mode on these devices, unless the
71 * timer counter register is never read. For more details please refer to
72 * the OMAP3/4/5 errata documents.
73 */
74 #define OMAP_TIMER_ERRATA_I103_I767 0x80000000
75
76 struct timer_regs {
77 u32 tidr;
78 u32 tier;
79 u32 twer;
80 u32 tclr;
81 u32 tcrr;
82 u32 tldr;
83 u32 ttrg;
84 u32 twps;
85 u32 tmar;
86 u32 tcar1;
87 u32 tsicr;
88 u32 tcar2;
89 u32 tpir;
90 u32 tnir;
91 u32 tcvr;
92 u32 tocr;
93 u32 towr;
94 };
95
96 struct omap_dm_timer {
97 int id;
98 int irq;
99 struct clk *fclk;
100
101 void __iomem *io_base;
102 void __iomem *irq_stat; /* TISR/IRQSTATUS interrupt status */
103 void __iomem *irq_ena; /* irq enable */
104 void __iomem *irq_dis; /* irq disable, only on v2 ip */
105 void __iomem *pend; /* write pending */
106 void __iomem *func_base; /* function register base */
107
108 unsigned long rate;
109 unsigned reserved:1;
110 unsigned posted:1;
111 struct timer_regs context;
112 int (*get_context_loss_count)(struct device *);
113 int ctx_loss_count;
114 int revision;
115 u32 capability;
116 u32 errata;
117 struct platform_device *pdev;
118 struct list_head node;
119 };
120
121 int omap_dm_timer_reserve_systimer(int id);
122 struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap);
123
124 int omap_dm_timer_get_irq(struct omap_dm_timer *timer);
125
126 u32 omap_dm_timer_modify_idlect_mask(u32 inputmask);
127
128 int omap_dm_timer_trigger(struct omap_dm_timer *timer);
129
130 int omap_dm_timers_active(void);
131
132 /*
133 * Do not use the defines below, they are not needed. They should be only
134 * used by dmtimer.c and sys_timer related code.
135 */
136
137 /*
138 * The interrupt registers are different between v1 and v2 ip.
139 * These registers are offsets from timer->iobase.
140 */
141 #define OMAP_TIMER_ID_OFFSET 0x00
142 #define OMAP_TIMER_OCP_CFG_OFFSET 0x10
143
144 #define OMAP_TIMER_V1_SYS_STAT_OFFSET 0x14
145 #define OMAP_TIMER_V1_STAT_OFFSET 0x18
146 #define OMAP_TIMER_V1_INT_EN_OFFSET 0x1c
147
148 #define OMAP_TIMER_V2_IRQSTATUS_RAW 0x24
149 #define OMAP_TIMER_V2_IRQSTATUS 0x28
150 #define OMAP_TIMER_V2_IRQENABLE_SET 0x2c
151 #define OMAP_TIMER_V2_IRQENABLE_CLR 0x30
152
153 /*
154 * The functional registers have a different base on v1 and v2 ip.
155 * These registers are offsets from timer->func_base. The func_base
156 * is samae as io_base for v1 and io_base + 0x14 for v2 ip.
157 *
158 */
159 #define OMAP_TIMER_V2_FUNC_OFFSET 0x14
160
161 #define _OMAP_TIMER_WAKEUP_EN_OFFSET 0x20
162 #define _OMAP_TIMER_CTRL_OFFSET 0x24
163 #define OMAP_TIMER_CTRL_GPOCFG (1 << 14)
164 #define OMAP_TIMER_CTRL_CAPTMODE (1 << 13)
165 #define OMAP_TIMER_CTRL_PT (1 << 12)
166 #define OMAP_TIMER_CTRL_TCM_LOWTOHIGH (0x1 << 8)
167 #define OMAP_TIMER_CTRL_TCM_HIGHTOLOW (0x2 << 8)
168 #define OMAP_TIMER_CTRL_TCM_BOTHEDGES (0x3 << 8)
169 #define OMAP_TIMER_CTRL_SCPWM (1 << 7)
170 #define OMAP_TIMER_CTRL_CE (1 << 6) /* compare enable */
171 #define OMAP_TIMER_CTRL_PRE (1 << 5) /* prescaler enable */
172 #define OMAP_TIMER_CTRL_PTV_SHIFT 2 /* prescaler value shift */
173 #define OMAP_TIMER_CTRL_POSTED (1 << 2)
174 #define OMAP_TIMER_CTRL_AR (1 << 1) /* auto-reload enable */
175 #define OMAP_TIMER_CTRL_ST (1 << 0) /* start timer */
176 #define _OMAP_TIMER_COUNTER_OFFSET 0x28
177 #define _OMAP_TIMER_LOAD_OFFSET 0x2c
178 #define _OMAP_TIMER_TRIGGER_OFFSET 0x30
179 #define _OMAP_TIMER_WRITE_PEND_OFFSET 0x34
180 #define WP_NONE 0 /* no write pending bit */
181 #define WP_TCLR (1 << 0)
182 #define WP_TCRR (1 << 1)
183 #define WP_TLDR (1 << 2)
184 #define WP_TTGR (1 << 3)
185 #define WP_TMAR (1 << 4)
186 #define WP_TPIR (1 << 5)
187 #define WP_TNIR (1 << 6)
188 #define WP_TCVR (1 << 7)
189 #define WP_TOCR (1 << 8)
190 #define WP_TOWR (1 << 9)
191 #define _OMAP_TIMER_MATCH_OFFSET 0x38
192 #define _OMAP_TIMER_CAPTURE_OFFSET 0x3c
193 #define _OMAP_TIMER_IF_CTRL_OFFSET 0x40
194 #define _OMAP_TIMER_CAPTURE2_OFFSET 0x44 /* TCAR2, 34xx only */
195 #define _OMAP_TIMER_TICK_POS_OFFSET 0x48 /* TPIR, 34xx only */
196 #define _OMAP_TIMER_TICK_NEG_OFFSET 0x4c /* TNIR, 34xx only */
197 #define _OMAP_TIMER_TICK_COUNT_OFFSET 0x50 /* TCVR, 34xx only */
198 #define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET 0x54 /* TOCR, 34xx only */
199 #define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET 0x58 /* TOWR, 34xx only */
200
201 /* register offsets with the write pending bit encoded */
202 #define WPSHIFT 16
203
204 #define OMAP_TIMER_WAKEUP_EN_REG (_OMAP_TIMER_WAKEUP_EN_OFFSET \
205 | (WP_NONE << WPSHIFT))
206
207 #define OMAP_TIMER_CTRL_REG (_OMAP_TIMER_CTRL_OFFSET \
208 | (WP_TCLR << WPSHIFT))
209
210 #define OMAP_TIMER_COUNTER_REG (_OMAP_TIMER_COUNTER_OFFSET \
211 | (WP_TCRR << WPSHIFT))
212
213 #define OMAP_TIMER_LOAD_REG (_OMAP_TIMER_LOAD_OFFSET \
214 | (WP_TLDR << WPSHIFT))
215
216 #define OMAP_TIMER_TRIGGER_REG (_OMAP_TIMER_TRIGGER_OFFSET \
217 | (WP_TTGR << WPSHIFT))
218
219 #define OMAP_TIMER_WRITE_PEND_REG (_OMAP_TIMER_WRITE_PEND_OFFSET \
220 | (WP_NONE << WPSHIFT))
221
222 #define OMAP_TIMER_MATCH_REG (_OMAP_TIMER_MATCH_OFFSET \
223 | (WP_TMAR << WPSHIFT))
224
225 #define OMAP_TIMER_CAPTURE_REG (_OMAP_TIMER_CAPTURE_OFFSET \
226 | (WP_NONE << WPSHIFT))
227
228 #define OMAP_TIMER_IF_CTRL_REG (_OMAP_TIMER_IF_CTRL_OFFSET \
229 | (WP_NONE << WPSHIFT))
230
231 #define OMAP_TIMER_CAPTURE2_REG (_OMAP_TIMER_CAPTURE2_OFFSET \
232 | (WP_NONE << WPSHIFT))
233
234 #define OMAP_TIMER_TICK_POS_REG (_OMAP_TIMER_TICK_POS_OFFSET \
235 | (WP_TPIR << WPSHIFT))
236
237 #define OMAP_TIMER_TICK_NEG_REG (_OMAP_TIMER_TICK_NEG_OFFSET \
238 | (WP_TNIR << WPSHIFT))
239
240 #define OMAP_TIMER_TICK_COUNT_REG (_OMAP_TIMER_TICK_COUNT_OFFSET \
241 | (WP_TCVR << WPSHIFT))
242
243 #define OMAP_TIMER_TICK_INT_MASK_SET_REG \
244 (_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT))
245
246 #define OMAP_TIMER_TICK_INT_MASK_COUNT_REG \
247 (_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))
248
249 /*
250 * The below are inlined to optimize code size for system timers. Other code
251 * should not need these at all, see
252 * include/linux/platform_data/pwm_omap_dmtimer.h
253 */
254 #if defined(CONFIG_ARCH_OMAP1) || defined(CONFIG_ARCH_OMAP2PLUS)
__omap_dm_timer_read(struct omap_dm_timer * timer,u32 reg,int posted)255 static inline u32 __omap_dm_timer_read(struct omap_dm_timer *timer, u32 reg,
256 int posted)
257 {
258 if (posted)
259 while (readl_relaxed(timer->pend) & (reg >> WPSHIFT))
260 cpu_relax();
261
262 return readl_relaxed(timer->func_base + (reg & 0xff));
263 }
264
__omap_dm_timer_write(struct omap_dm_timer * timer,u32 reg,u32 val,int posted)265 static inline void __omap_dm_timer_write(struct omap_dm_timer *timer,
266 u32 reg, u32 val, int posted)
267 {
268 if (posted)
269 while (readl_relaxed(timer->pend) & (reg >> WPSHIFT))
270 cpu_relax();
271
272 writel_relaxed(val, timer->func_base + (reg & 0xff));
273 }
274
__omap_dm_timer_init_regs(struct omap_dm_timer * timer)275 static inline void __omap_dm_timer_init_regs(struct omap_dm_timer *timer)
276 {
277 u32 tidr;
278
279 /* Assume v1 ip if bits [31:16] are zero */
280 tidr = readl_relaxed(timer->io_base);
281 if (!(tidr >> 16)) {
282 timer->revision = 1;
283 timer->irq_stat = timer->io_base + OMAP_TIMER_V1_STAT_OFFSET;
284 timer->irq_ena = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
285 timer->irq_dis = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
286 timer->pend = timer->io_base + _OMAP_TIMER_WRITE_PEND_OFFSET;
287 timer->func_base = timer->io_base;
288 } else {
289 timer->revision = 2;
290 timer->irq_stat = timer->io_base + OMAP_TIMER_V2_IRQSTATUS;
291 timer->irq_ena = timer->io_base + OMAP_TIMER_V2_IRQENABLE_SET;
292 timer->irq_dis = timer->io_base + OMAP_TIMER_V2_IRQENABLE_CLR;
293 timer->pend = timer->io_base +
294 _OMAP_TIMER_WRITE_PEND_OFFSET +
295 OMAP_TIMER_V2_FUNC_OFFSET;
296 timer->func_base = timer->io_base + OMAP_TIMER_V2_FUNC_OFFSET;
297 }
298 }
299
300 /*
301 * __omap_dm_timer_enable_posted - enables write posted mode
302 * @timer: pointer to timer instance handle
303 *
304 * Enables the write posted mode for the timer. When posted mode is enabled
305 * writes to certain timer registers are immediately acknowledged by the
306 * internal bus and hence prevents stalling the CPU waiting for the write to
307 * complete. Enabling this feature can improve performance for writing to the
308 * timer registers.
309 */
__omap_dm_timer_enable_posted(struct omap_dm_timer * timer)310 static inline void __omap_dm_timer_enable_posted(struct omap_dm_timer *timer)
311 {
312 if (timer->posted)
313 return;
314
315 if (timer->errata & OMAP_TIMER_ERRATA_I103_I767) {
316 timer->posted = OMAP_TIMER_NONPOSTED;
317 __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0, 0);
318 return;
319 }
320
321 __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG,
322 OMAP_TIMER_CTRL_POSTED, 0);
323 timer->context.tsicr = OMAP_TIMER_CTRL_POSTED;
324 timer->posted = OMAP_TIMER_POSTED;
325 }
326
327 /**
328 * __omap_dm_timer_override_errata - override errata flags for a timer
329 * @timer: pointer to timer handle
330 * @errata: errata flags to be ignored
331 *
332 * For a given timer, override a timer errata by clearing the flags
333 * specified by the errata argument. A specific erratum should only be
334 * overridden for a timer if the timer is used in such a way the erratum
335 * has no impact.
336 */
__omap_dm_timer_override_errata(struct omap_dm_timer * timer,u32 errata)337 static inline void __omap_dm_timer_override_errata(struct omap_dm_timer *timer,
338 u32 errata)
339 {
340 timer->errata &= ~errata;
341 }
342
__omap_dm_timer_stop(struct omap_dm_timer * timer,int posted,unsigned long rate)343 static inline void __omap_dm_timer_stop(struct omap_dm_timer *timer,
344 int posted, unsigned long rate)
345 {
346 u32 l;
347
348 l = __omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted);
349 if (l & OMAP_TIMER_CTRL_ST) {
350 l &= ~0x1;
351 __omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, l, posted);
352 #ifdef CONFIG_ARCH_OMAP2PLUS
353 /* Readback to make sure write has completed */
354 __omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted);
355 /*
356 * Wait for functional clock period x 3.5 to make sure that
357 * timer is stopped
358 */
359 udelay(3500000 / rate + 1);
360 #endif
361 }
362
363 /* Ack possibly pending interrupt */
364 writel_relaxed(OMAP_TIMER_INT_OVERFLOW, timer->irq_stat);
365 }
366
__omap_dm_timer_load_start(struct omap_dm_timer * timer,u32 ctrl,unsigned int load,int posted)367 static inline void __omap_dm_timer_load_start(struct omap_dm_timer *timer,
368 u32 ctrl, unsigned int load,
369 int posted)
370 {
371 __omap_dm_timer_write(timer, OMAP_TIMER_COUNTER_REG, load, posted);
372 __omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, ctrl, posted);
373 }
374
__omap_dm_timer_int_enable(struct omap_dm_timer * timer,unsigned int value)375 static inline void __omap_dm_timer_int_enable(struct omap_dm_timer *timer,
376 unsigned int value)
377 {
378 writel_relaxed(value, timer->irq_ena);
379 __omap_dm_timer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, value, 0);
380 }
381
382 static inline unsigned int
__omap_dm_timer_read_counter(struct omap_dm_timer * timer,int posted)383 __omap_dm_timer_read_counter(struct omap_dm_timer *timer, int posted)
384 {
385 return __omap_dm_timer_read(timer, OMAP_TIMER_COUNTER_REG, posted);
386 }
387
__omap_dm_timer_write_status(struct omap_dm_timer * timer,unsigned int value)388 static inline void __omap_dm_timer_write_status(struct omap_dm_timer *timer,
389 unsigned int value)
390 {
391 writel_relaxed(value, timer->irq_stat);
392 }
393 #endif /* CONFIG_ARCH_OMAP1 || CONFIG_ARCH_OMAP2PLUS */
394 #endif /* __CLOCKSOURCE_DMTIMER_H */
395
