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Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001/*
2 * SuperH Timer Support - CMT
3 *
4 * Copyright (C) 2008 Magnus Damm
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
Magnus Damm3fb1b6a2009-01-22 09:55:59 +000014 */
15
Magnus Damm3fb1b6a2009-01-22 09:55:59 +000016#include <linux/clk.h>
Magnus Damm3fb1b6a2009-01-22 09:55:59 +000017#include <linux/clockchips.h>
Laurent Pincharte7a9bcc2014-02-12 16:56:44 +010018#include <linux/clocksource.h>
19#include <linux/delay.h>
20#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/interrupt.h>
23#include <linux/io.h>
24#include <linux/ioport.h>
25#include <linux/irq.h>
Paul Gortmaker7deeab52011-07-03 13:36:22 -040026#include <linux/module.h>
Laurent Pinchart1768aa22014-02-12 17:12:40 +010027#include <linux/of.h>
Laurent Pincharte7a9bcc2014-02-12 16:56:44 +010028#include <linux/platform_device.h>
Rafael J. Wysocki615a4452012-03-13 22:40:06 +010029#include <linux/pm_domain.h>
Rafael J. Wysockibad81382012-08-06 01:48:57 +020030#include <linux/pm_runtime.h>
Laurent Pincharte7a9bcc2014-02-12 16:56:44 +010031#include <linux/sh_timer.h>
32#include <linux/slab.h>
33#include <linux/spinlock.h>
Magnus Damm3fb1b6a2009-01-22 09:55:59 +000034
Laurent Pinchart2653caf2014-01-27 22:04:17 +010035struct sh_cmt_device;
Laurent Pinchart7269f932014-01-27 15:29:19 +010036
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +010037/*
38 * The CMT comes in 5 different identified flavours, depending not only on the
39 * SoC but also on the particular instance. The following table lists the main
40 * characteristics of those flavours.
41 *
42 * 16B 32B 32B-F 48B 48B-2
43 * -----------------------------------------------------------------------------
44 * Channels 2 1/4 1 6 2/8
45 * Control Width 16 16 16 16 32
46 * Counter Width 16 32 32 32/48 32/48
47 * Shared Start/Stop Y Y Y Y N
48 *
49 * The 48-bit gen2 version has a per-channel start/stop register located in the
50 * channel registers block. All other versions have a shared start/stop register
51 * located in the global space.
52 *
Laurent Pinchart81b3b272014-01-28 12:36:48 +010053 * Channels are indexed from 0 to N-1 in the documentation. The channel index
54 * infers the start/stop bit position in the control register and the channel
55 * registers block address. Some CMT instances have a subset of channels
56 * available, in which case the index in the documentation doesn't match the
57 * "real" index as implemented in hardware. This is for instance the case with
58 * CMT0 on r8a7740, which is a 32-bit variant with a single channel numbered 0
59 * in the documentation but using start/stop bit 5 and having its registers
60 * block at 0x60.
61 *
62 * Similarly CMT0 on r8a73a4, r8a7790 and r8a7791, while implementing 32-bit
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +010063 * channels only, is a 48-bit gen2 CMT with the 48-bit channels unavailable.
64 */
65
66enum sh_cmt_model {
67 SH_CMT_16BIT,
68 SH_CMT_32BIT,
69 SH_CMT_32BIT_FAST,
70 SH_CMT_48BIT,
71 SH_CMT_48BIT_GEN2,
72};
73
74struct sh_cmt_info {
75 enum sh_cmt_model model;
76
77 unsigned long width; /* 16 or 32 bit version of hardware block */
78 unsigned long overflow_bit;
79 unsigned long clear_bits;
80
81 /* callbacks for CMSTR and CMCSR access */
82 unsigned long (*read_control)(void __iomem *base, unsigned long offs);
83 void (*write_control)(void __iomem *base, unsigned long offs,
84 unsigned long value);
85
86 /* callbacks for CMCNT and CMCOR access */
87 unsigned long (*read_count)(void __iomem *base, unsigned long offs);
88 void (*write_count)(void __iomem *base, unsigned long offs,
89 unsigned long value);
90};
91
Laurent Pinchart7269f932014-01-27 15:29:19 +010092struct sh_cmt_channel {
Laurent Pinchart2653caf2014-01-27 22:04:17 +010093 struct sh_cmt_device *cmt;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +000094
Laurent Pinchart81b3b272014-01-28 12:36:48 +010095 unsigned int index; /* Index in the documentation */
96 unsigned int hwidx; /* Real hardware index */
Laurent Pinchartc924d2d2014-01-27 22:04:17 +010097
Laurent Pinchart81b3b272014-01-28 12:36:48 +010098 void __iomem *iostart;
99 void __iomem *ioctrl;
100
101 unsigned int timer_bit;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000102 unsigned long flags;
103 unsigned long match_value;
104 unsigned long next_match_value;
105 unsigned long max_match_value;
106 unsigned long rate;
Paul Mundt7d0c3992012-05-25 13:36:43 +0900107 raw_spinlock_t lock;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000108 struct clock_event_device ced;
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000109 struct clocksource cs;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000110 unsigned long total_cycles;
Rafael J. Wysockibad81382012-08-06 01:48:57 +0200111 bool cs_enabled;
Laurent Pinchart7269f932014-01-27 15:29:19 +0100112};
113
Laurent Pinchart2653caf2014-01-27 22:04:17 +0100114struct sh_cmt_device {
Laurent Pinchart7269f932014-01-27 15:29:19 +0100115 struct platform_device *pdev;
116
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100117 const struct sh_cmt_info *info;
118
Laurent Pinchart7269f932014-01-27 15:29:19 +0100119 void __iomem *mapbase;
Laurent Pinchart7269f932014-01-27 15:29:19 +0100120 struct clk *clk;
121
Laurent Pinchartde599c82014-02-17 16:49:05 +0100122 raw_spinlock_t lock; /* Protect the shared start/stop register */
123
Laurent Pinchartf5ec9b12014-01-27 22:04:17 +0100124 struct sh_cmt_channel *channels;
125 unsigned int num_channels;
Laurent Pinchart1768aa22014-02-12 17:12:40 +0100126 unsigned int hw_channels;
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100127
128 bool has_clockevent;
129 bool has_clocksource;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000130};
131
Laurent Pinchartd14be992014-01-29 00:33:08 +0100132#define SH_CMT16_CMCSR_CMF (1 << 7)
133#define SH_CMT16_CMCSR_CMIE (1 << 6)
134#define SH_CMT16_CMCSR_CKS8 (0 << 0)
135#define SH_CMT16_CMCSR_CKS32 (1 << 0)
136#define SH_CMT16_CMCSR_CKS128 (2 << 0)
137#define SH_CMT16_CMCSR_CKS512 (3 << 0)
138#define SH_CMT16_CMCSR_CKS_MASK (3 << 0)
139
140#define SH_CMT32_CMCSR_CMF (1 << 15)
141#define SH_CMT32_CMCSR_OVF (1 << 14)
142#define SH_CMT32_CMCSR_WRFLG (1 << 13)
143#define SH_CMT32_CMCSR_STTF (1 << 12)
144#define SH_CMT32_CMCSR_STPF (1 << 11)
145#define SH_CMT32_CMCSR_SSIE (1 << 10)
146#define SH_CMT32_CMCSR_CMS (1 << 9)
147#define SH_CMT32_CMCSR_CMM (1 << 8)
148#define SH_CMT32_CMCSR_CMTOUT_IE (1 << 7)
149#define SH_CMT32_CMCSR_CMR_NONE (0 << 4)
150#define SH_CMT32_CMCSR_CMR_DMA (1 << 4)
151#define SH_CMT32_CMCSR_CMR_IRQ (2 << 4)
152#define SH_CMT32_CMCSR_CMR_MASK (3 << 4)
153#define SH_CMT32_CMCSR_DBGIVD (1 << 3)
154#define SH_CMT32_CMCSR_CKS_RCLK8 (4 << 0)
155#define SH_CMT32_CMCSR_CKS_RCLK32 (5 << 0)
156#define SH_CMT32_CMCSR_CKS_RCLK128 (6 << 0)
157#define SH_CMT32_CMCSR_CKS_RCLK1 (7 << 0)
158#define SH_CMT32_CMCSR_CKS_MASK (7 << 0)
159
Magnus Damma6a912c2012-12-14 14:54:19 +0900160static unsigned long sh_cmt_read16(void __iomem *base, unsigned long offs)
Magnus Damm587acb32012-12-14 14:54:10 +0900161{
162 return ioread16(base + (offs << 1));
163}
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000164
Magnus Damma6a912c2012-12-14 14:54:19 +0900165static unsigned long sh_cmt_read32(void __iomem *base, unsigned long offs)
166{
167 return ioread32(base + (offs << 2));
168}
169
170static void sh_cmt_write16(void __iomem *base, unsigned long offs,
171 unsigned long value)
Magnus Damm587acb32012-12-14 14:54:10 +0900172{
173 iowrite16(value, base + (offs << 1));
174}
175
Magnus Damma6a912c2012-12-14 14:54:19 +0900176static void sh_cmt_write32(void __iomem *base, unsigned long offs,
177 unsigned long value)
178{
179 iowrite32(value, base + (offs << 2));
180}
181
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100182static const struct sh_cmt_info sh_cmt_info[] = {
183 [SH_CMT_16BIT] = {
184 .model = SH_CMT_16BIT,
185 .width = 16,
Laurent Pinchartd14be992014-01-29 00:33:08 +0100186 .overflow_bit = SH_CMT16_CMCSR_CMF,
187 .clear_bits = ~SH_CMT16_CMCSR_CMF,
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100188 .read_control = sh_cmt_read16,
189 .write_control = sh_cmt_write16,
190 .read_count = sh_cmt_read16,
191 .write_count = sh_cmt_write16,
192 },
193 [SH_CMT_32BIT] = {
194 .model = SH_CMT_32BIT,
195 .width = 32,
Laurent Pinchartd14be992014-01-29 00:33:08 +0100196 .overflow_bit = SH_CMT32_CMCSR_CMF,
197 .clear_bits = ~(SH_CMT32_CMCSR_CMF | SH_CMT32_CMCSR_OVF),
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100198 .read_control = sh_cmt_read16,
199 .write_control = sh_cmt_write16,
200 .read_count = sh_cmt_read32,
201 .write_count = sh_cmt_write32,
202 },
203 [SH_CMT_32BIT_FAST] = {
204 .model = SH_CMT_32BIT_FAST,
205 .width = 32,
Laurent Pinchartd14be992014-01-29 00:33:08 +0100206 .overflow_bit = SH_CMT32_CMCSR_CMF,
207 .clear_bits = ~(SH_CMT32_CMCSR_CMF | SH_CMT32_CMCSR_OVF),
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100208 .read_control = sh_cmt_read16,
209 .write_control = sh_cmt_write16,
210 .read_count = sh_cmt_read32,
211 .write_count = sh_cmt_write32,
212 },
213 [SH_CMT_48BIT] = {
214 .model = SH_CMT_48BIT,
215 .width = 32,
Laurent Pinchartd14be992014-01-29 00:33:08 +0100216 .overflow_bit = SH_CMT32_CMCSR_CMF,
217 .clear_bits = ~(SH_CMT32_CMCSR_CMF | SH_CMT32_CMCSR_OVF),
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100218 .read_control = sh_cmt_read32,
219 .write_control = sh_cmt_write32,
220 .read_count = sh_cmt_read32,
221 .write_count = sh_cmt_write32,
222 },
223 [SH_CMT_48BIT_GEN2] = {
224 .model = SH_CMT_48BIT_GEN2,
225 .width = 32,
Laurent Pinchartd14be992014-01-29 00:33:08 +0100226 .overflow_bit = SH_CMT32_CMCSR_CMF,
227 .clear_bits = ~(SH_CMT32_CMCSR_CMF | SH_CMT32_CMCSR_OVF),
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100228 .read_control = sh_cmt_read32,
229 .write_control = sh_cmt_write32,
230 .read_count = sh_cmt_read32,
231 .write_count = sh_cmt_write32,
232 },
233};
234
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000235#define CMCSR 0 /* channel register */
236#define CMCNT 1 /* channel register */
237#define CMCOR 2 /* channel register */
238
Laurent Pinchart7269f932014-01-27 15:29:19 +0100239static inline unsigned long sh_cmt_read_cmstr(struct sh_cmt_channel *ch)
Magnus Damm1b56b962012-12-14 14:54:00 +0900240{
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100241 if (ch->iostart)
242 return ch->cmt->info->read_control(ch->iostart, 0);
243 else
244 return ch->cmt->info->read_control(ch->cmt->mapbase, 0);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000245}
246
Laurent Pinchart7269f932014-01-27 15:29:19 +0100247static inline void sh_cmt_write_cmstr(struct sh_cmt_channel *ch,
Magnus Damm1b56b962012-12-14 14:54:00 +0900248 unsigned long value)
249{
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100250 if (ch->iostart)
251 ch->cmt->info->write_control(ch->iostart, 0, value);
252 else
253 ch->cmt->info->write_control(ch->cmt->mapbase, 0, value);
254}
255
256static inline unsigned long sh_cmt_read_cmcsr(struct sh_cmt_channel *ch)
257{
258 return ch->cmt->info->read_control(ch->ioctrl, CMCSR);
Magnus Damm1b56b962012-12-14 14:54:00 +0900259}
260
Laurent Pinchart7269f932014-01-27 15:29:19 +0100261static inline void sh_cmt_write_cmcsr(struct sh_cmt_channel *ch,
Magnus Damm1b56b962012-12-14 14:54:00 +0900262 unsigned long value)
263{
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100264 ch->cmt->info->write_control(ch->ioctrl, CMCSR, value);
265}
266
267static inline unsigned long sh_cmt_read_cmcnt(struct sh_cmt_channel *ch)
268{
269 return ch->cmt->info->read_count(ch->ioctrl, CMCNT);
Magnus Damm1b56b962012-12-14 14:54:00 +0900270}
271
Laurent Pinchart7269f932014-01-27 15:29:19 +0100272static inline void sh_cmt_write_cmcnt(struct sh_cmt_channel *ch,
Magnus Damm1b56b962012-12-14 14:54:00 +0900273 unsigned long value)
274{
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100275 ch->cmt->info->write_count(ch->ioctrl, CMCNT, value);
Magnus Damm1b56b962012-12-14 14:54:00 +0900276}
277
Laurent Pinchart7269f932014-01-27 15:29:19 +0100278static inline void sh_cmt_write_cmcor(struct sh_cmt_channel *ch,
Magnus Damm1b56b962012-12-14 14:54:00 +0900279 unsigned long value)
280{
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100281 ch->cmt->info->write_count(ch->ioctrl, CMCOR, value);
Magnus Damm1b56b962012-12-14 14:54:00 +0900282}
283
Laurent Pinchart7269f932014-01-27 15:29:19 +0100284static unsigned long sh_cmt_get_counter(struct sh_cmt_channel *ch,
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000285 int *has_wrapped)
286{
287 unsigned long v1, v2, v3;
Magnus Damm5b644c72009-04-28 08:17:54 +0000288 int o1, o2;
289
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100290 o1 = sh_cmt_read_cmcsr(ch) & ch->cmt->info->overflow_bit;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000291
292 /* Make sure the timer value is stable. Stolen from acpi_pm.c */
293 do {
Magnus Damm5b644c72009-04-28 08:17:54 +0000294 o2 = o1;
Laurent Pinchart7269f932014-01-27 15:29:19 +0100295 v1 = sh_cmt_read_cmcnt(ch);
296 v2 = sh_cmt_read_cmcnt(ch);
297 v3 = sh_cmt_read_cmcnt(ch);
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100298 o1 = sh_cmt_read_cmcsr(ch) & ch->cmt->info->overflow_bit;
Magnus Damm5b644c72009-04-28 08:17:54 +0000299 } while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
300 || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000301
Magnus Damm5b644c72009-04-28 08:17:54 +0000302 *has_wrapped = o1;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000303 return v2;
304}
305
Laurent Pinchart7269f932014-01-27 15:29:19 +0100306static void sh_cmt_start_stop_ch(struct sh_cmt_channel *ch, int start)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000307{
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000308 unsigned long flags, value;
309
310 /* start stop register shared by multiple timer channels */
Laurent Pinchartde599c82014-02-17 16:49:05 +0100311 raw_spin_lock_irqsave(&ch->cmt->lock, flags);
Laurent Pinchart7269f932014-01-27 15:29:19 +0100312 value = sh_cmt_read_cmstr(ch);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000313
314 if (start)
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100315 value |= 1 << ch->timer_bit;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000316 else
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100317 value &= ~(1 << ch->timer_bit);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000318
Laurent Pinchart7269f932014-01-27 15:29:19 +0100319 sh_cmt_write_cmstr(ch, value);
Laurent Pinchartde599c82014-02-17 16:49:05 +0100320 raw_spin_unlock_irqrestore(&ch->cmt->lock, flags);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000321}
322
Laurent Pinchart7269f932014-01-27 15:29:19 +0100323static int sh_cmt_enable(struct sh_cmt_channel *ch, unsigned long *rate)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000324{
Magnus Damm3f7e5e22011-07-13 07:59:48 +0000325 int k, ret;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000326
Laurent Pinchart7269f932014-01-27 15:29:19 +0100327 pm_runtime_get_sync(&ch->cmt->pdev->dev);
328 dev_pm_syscore_device(&ch->cmt->pdev->dev, true);
Rafael J. Wysockibad81382012-08-06 01:48:57 +0200329
Paul Mundt9436b4a2011-05-31 15:26:42 +0900330 /* enable clock */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100331 ret = clk_enable(ch->cmt->clk);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000332 if (ret) {
Laurent Pinchart740a9512014-01-27 22:04:17 +0100333 dev_err(&ch->cmt->pdev->dev, "ch%u: cannot enable clock\n",
334 ch->index);
Magnus Damm3f7e5e22011-07-13 07:59:48 +0000335 goto err0;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000336 }
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000337
338 /* make sure channel is disabled */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100339 sh_cmt_start_stop_ch(ch, 0);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000340
341 /* configure channel, periodic mode and maximum timeout */
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100342 if (ch->cmt->info->width == 16) {
Laurent Pinchart7269f932014-01-27 15:29:19 +0100343 *rate = clk_get_rate(ch->cmt->clk) / 512;
Laurent Pinchartd14be992014-01-29 00:33:08 +0100344 sh_cmt_write_cmcsr(ch, SH_CMT16_CMCSR_CMIE |
345 SH_CMT16_CMCSR_CKS512);
Magnus Damm3014f472009-04-29 14:50:37 +0000346 } else {
Laurent Pinchart7269f932014-01-27 15:29:19 +0100347 *rate = clk_get_rate(ch->cmt->clk) / 8;
Laurent Pinchartd14be992014-01-29 00:33:08 +0100348 sh_cmt_write_cmcsr(ch, SH_CMT32_CMCSR_CMM |
349 SH_CMT32_CMCSR_CMTOUT_IE |
350 SH_CMT32_CMCSR_CMR_IRQ |
351 SH_CMT32_CMCSR_CKS_RCLK8);
Magnus Damm3014f472009-04-29 14:50:37 +0000352 }
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000353
Laurent Pinchart7269f932014-01-27 15:29:19 +0100354 sh_cmt_write_cmcor(ch, 0xffffffff);
355 sh_cmt_write_cmcnt(ch, 0);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000356
Magnus Damm3f7e5e22011-07-13 07:59:48 +0000357 /*
358 * According to the sh73a0 user's manual, as CMCNT can be operated
359 * only by the RCLK (Pseudo 32 KHz), there's one restriction on
360 * modifying CMCNT register; two RCLK cycles are necessary before
361 * this register is either read or any modification of the value
362 * it holds is reflected in the LSI's actual operation.
363 *
364 * While at it, we're supposed to clear out the CMCNT as of this
365 * moment, so make sure it's processed properly here. This will
366 * take RCLKx2 at maximum.
367 */
368 for (k = 0; k < 100; k++) {
Laurent Pinchart7269f932014-01-27 15:29:19 +0100369 if (!sh_cmt_read_cmcnt(ch))
Magnus Damm3f7e5e22011-07-13 07:59:48 +0000370 break;
371 udelay(1);
372 }
373
Laurent Pinchart7269f932014-01-27 15:29:19 +0100374 if (sh_cmt_read_cmcnt(ch)) {
Laurent Pinchart740a9512014-01-27 22:04:17 +0100375 dev_err(&ch->cmt->pdev->dev, "ch%u: cannot clear CMCNT\n",
376 ch->index);
Magnus Damm3f7e5e22011-07-13 07:59:48 +0000377 ret = -ETIMEDOUT;
378 goto err1;
379 }
380
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000381 /* enable channel */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100382 sh_cmt_start_stop_ch(ch, 1);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000383 return 0;
Magnus Damm3f7e5e22011-07-13 07:59:48 +0000384 err1:
385 /* stop clock */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100386 clk_disable(ch->cmt->clk);
Magnus Damm3f7e5e22011-07-13 07:59:48 +0000387
388 err0:
389 return ret;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000390}
391
Laurent Pinchart7269f932014-01-27 15:29:19 +0100392static void sh_cmt_disable(struct sh_cmt_channel *ch)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000393{
394 /* disable channel */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100395 sh_cmt_start_stop_ch(ch, 0);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000396
Magnus Dammbe890a12009-06-17 05:04:04 +0000397 /* disable interrupts in CMT block */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100398 sh_cmt_write_cmcsr(ch, 0);
Magnus Dammbe890a12009-06-17 05:04:04 +0000399
Paul Mundt9436b4a2011-05-31 15:26:42 +0900400 /* stop clock */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100401 clk_disable(ch->cmt->clk);
Rafael J. Wysockibad81382012-08-06 01:48:57 +0200402
Laurent Pinchart7269f932014-01-27 15:29:19 +0100403 dev_pm_syscore_device(&ch->cmt->pdev->dev, false);
404 pm_runtime_put(&ch->cmt->pdev->dev);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000405}
406
407/* private flags */
408#define FLAG_CLOCKEVENT (1 << 0)
409#define FLAG_CLOCKSOURCE (1 << 1)
410#define FLAG_REPROGRAM (1 << 2)
411#define FLAG_SKIPEVENT (1 << 3)
412#define FLAG_IRQCONTEXT (1 << 4)
413
Laurent Pinchart7269f932014-01-27 15:29:19 +0100414static void sh_cmt_clock_event_program_verify(struct sh_cmt_channel *ch,
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000415 int absolute)
416{
417 unsigned long new_match;
Laurent Pinchart7269f932014-01-27 15:29:19 +0100418 unsigned long value = ch->next_match_value;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000419 unsigned long delay = 0;
420 unsigned long now = 0;
421 int has_wrapped;
422
Laurent Pinchart7269f932014-01-27 15:29:19 +0100423 now = sh_cmt_get_counter(ch, &has_wrapped);
424 ch->flags |= FLAG_REPROGRAM; /* force reprogram */
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000425
426 if (has_wrapped) {
427 /* we're competing with the interrupt handler.
428 * -> let the interrupt handler reprogram the timer.
429 * -> interrupt number two handles the event.
430 */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100431 ch->flags |= FLAG_SKIPEVENT;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000432 return;
433 }
434
435 if (absolute)
436 now = 0;
437
438 do {
439 /* reprogram the timer hardware,
440 * but don't save the new match value yet.
441 */
442 new_match = now + value + delay;
Laurent Pinchart7269f932014-01-27 15:29:19 +0100443 if (new_match > ch->max_match_value)
444 new_match = ch->max_match_value;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000445
Laurent Pinchart7269f932014-01-27 15:29:19 +0100446 sh_cmt_write_cmcor(ch, new_match);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000447
Laurent Pinchart7269f932014-01-27 15:29:19 +0100448 now = sh_cmt_get_counter(ch, &has_wrapped);
449 if (has_wrapped && (new_match > ch->match_value)) {
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000450 /* we are changing to a greater match value,
451 * so this wrap must be caused by the counter
452 * matching the old value.
453 * -> first interrupt reprograms the timer.
454 * -> interrupt number two handles the event.
455 */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100456 ch->flags |= FLAG_SKIPEVENT;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000457 break;
458 }
459
460 if (has_wrapped) {
461 /* we are changing to a smaller match value,
462 * so the wrap must be caused by the counter
463 * matching the new value.
464 * -> save programmed match value.
465 * -> let isr handle the event.
466 */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100467 ch->match_value = new_match;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000468 break;
469 }
470
471 /* be safe: verify hardware settings */
472 if (now < new_match) {
473 /* timer value is below match value, all good.
474 * this makes sure we won't miss any match events.
475 * -> save programmed match value.
476 * -> let isr handle the event.
477 */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100478 ch->match_value = new_match;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000479 break;
480 }
481
482 /* the counter has reached a value greater
483 * than our new match value. and since the
484 * has_wrapped flag isn't set we must have
485 * programmed a too close event.
486 * -> increase delay and retry.
487 */
488 if (delay)
489 delay <<= 1;
490 else
491 delay = 1;
492
493 if (!delay)
Laurent Pinchart740a9512014-01-27 22:04:17 +0100494 dev_warn(&ch->cmt->pdev->dev, "ch%u: too long delay\n",
495 ch->index);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000496
497 } while (delay);
498}
499
Laurent Pinchart7269f932014-01-27 15:29:19 +0100500static void __sh_cmt_set_next(struct sh_cmt_channel *ch, unsigned long delta)
Takashi YOSHII65ada542010-12-17 07:25:09 +0000501{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100502 if (delta > ch->max_match_value)
Laurent Pinchart740a9512014-01-27 22:04:17 +0100503 dev_warn(&ch->cmt->pdev->dev, "ch%u: delta out of range\n",
504 ch->index);
Takashi YOSHII65ada542010-12-17 07:25:09 +0000505
Laurent Pinchart7269f932014-01-27 15:29:19 +0100506 ch->next_match_value = delta;
507 sh_cmt_clock_event_program_verify(ch, 0);
Takashi YOSHII65ada542010-12-17 07:25:09 +0000508}
509
Laurent Pinchart7269f932014-01-27 15:29:19 +0100510static void sh_cmt_set_next(struct sh_cmt_channel *ch, unsigned long delta)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000511{
512 unsigned long flags;
513
Laurent Pinchart7269f932014-01-27 15:29:19 +0100514 raw_spin_lock_irqsave(&ch->lock, flags);
515 __sh_cmt_set_next(ch, delta);
516 raw_spin_unlock_irqrestore(&ch->lock, flags);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000517}
518
519static irqreturn_t sh_cmt_interrupt(int irq, void *dev_id)
520{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100521 struct sh_cmt_channel *ch = dev_id;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000522
523 /* clear flags */
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100524 sh_cmt_write_cmcsr(ch, sh_cmt_read_cmcsr(ch) &
525 ch->cmt->info->clear_bits);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000526
527 /* update clock source counter to begin with if enabled
528 * the wrap flag should be cleared by the timer specific
529 * isr before we end up here.
530 */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100531 if (ch->flags & FLAG_CLOCKSOURCE)
532 ch->total_cycles += ch->match_value + 1;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000533
Laurent Pinchart7269f932014-01-27 15:29:19 +0100534 if (!(ch->flags & FLAG_REPROGRAM))
535 ch->next_match_value = ch->max_match_value;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000536
Laurent Pinchart7269f932014-01-27 15:29:19 +0100537 ch->flags |= FLAG_IRQCONTEXT;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000538
Laurent Pinchart7269f932014-01-27 15:29:19 +0100539 if (ch->flags & FLAG_CLOCKEVENT) {
540 if (!(ch->flags & FLAG_SKIPEVENT)) {
Viresh Kumar051b7822015-06-18 16:24:34 +0530541 if (clockevent_state_oneshot(&ch->ced)) {
Laurent Pinchart7269f932014-01-27 15:29:19 +0100542 ch->next_match_value = ch->max_match_value;
543 ch->flags |= FLAG_REPROGRAM;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000544 }
545
Laurent Pinchart7269f932014-01-27 15:29:19 +0100546 ch->ced.event_handler(&ch->ced);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000547 }
548 }
549
Laurent Pinchart7269f932014-01-27 15:29:19 +0100550 ch->flags &= ~FLAG_SKIPEVENT;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000551
Laurent Pinchart7269f932014-01-27 15:29:19 +0100552 if (ch->flags & FLAG_REPROGRAM) {
553 ch->flags &= ~FLAG_REPROGRAM;
554 sh_cmt_clock_event_program_verify(ch, 1);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000555
Laurent Pinchart7269f932014-01-27 15:29:19 +0100556 if (ch->flags & FLAG_CLOCKEVENT)
Viresh Kumar051b7822015-06-18 16:24:34 +0530557 if ((clockevent_state_shutdown(&ch->ced))
Laurent Pinchart7269f932014-01-27 15:29:19 +0100558 || (ch->match_value == ch->next_match_value))
559 ch->flags &= ~FLAG_REPROGRAM;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000560 }
561
Laurent Pinchart7269f932014-01-27 15:29:19 +0100562 ch->flags &= ~FLAG_IRQCONTEXT;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000563
564 return IRQ_HANDLED;
565}
566
Laurent Pinchart7269f932014-01-27 15:29:19 +0100567static int sh_cmt_start(struct sh_cmt_channel *ch, unsigned long flag)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000568{
569 int ret = 0;
570 unsigned long flags;
571
Laurent Pinchart7269f932014-01-27 15:29:19 +0100572 raw_spin_lock_irqsave(&ch->lock, flags);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000573
Laurent Pinchart7269f932014-01-27 15:29:19 +0100574 if (!(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE)))
575 ret = sh_cmt_enable(ch, &ch->rate);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000576
577 if (ret)
578 goto out;
Laurent Pinchart7269f932014-01-27 15:29:19 +0100579 ch->flags |= flag;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000580
581 /* setup timeout if no clockevent */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100582 if ((flag == FLAG_CLOCKSOURCE) && (!(ch->flags & FLAG_CLOCKEVENT)))
583 __sh_cmt_set_next(ch, ch->max_match_value);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000584 out:
Laurent Pinchart7269f932014-01-27 15:29:19 +0100585 raw_spin_unlock_irqrestore(&ch->lock, flags);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000586
587 return ret;
588}
589
Laurent Pinchart7269f932014-01-27 15:29:19 +0100590static void sh_cmt_stop(struct sh_cmt_channel *ch, unsigned long flag)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000591{
592 unsigned long flags;
593 unsigned long f;
594
Laurent Pinchart7269f932014-01-27 15:29:19 +0100595 raw_spin_lock_irqsave(&ch->lock, flags);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000596
Laurent Pinchart7269f932014-01-27 15:29:19 +0100597 f = ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE);
598 ch->flags &= ~flag;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000599
Laurent Pinchart7269f932014-01-27 15:29:19 +0100600 if (f && !(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE)))
601 sh_cmt_disable(ch);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000602
603 /* adjust the timeout to maximum if only clocksource left */
Laurent Pinchart7269f932014-01-27 15:29:19 +0100604 if ((flag == FLAG_CLOCKEVENT) && (ch->flags & FLAG_CLOCKSOURCE))
605 __sh_cmt_set_next(ch, ch->max_match_value);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000606
Laurent Pinchart7269f932014-01-27 15:29:19 +0100607 raw_spin_unlock_irqrestore(&ch->lock, flags);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000608}
609
Laurent Pinchart7269f932014-01-27 15:29:19 +0100610static struct sh_cmt_channel *cs_to_sh_cmt(struct clocksource *cs)
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000611{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100612 return container_of(cs, struct sh_cmt_channel, cs);
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000613}
614
615static cycle_t sh_cmt_clocksource_read(struct clocksource *cs)
616{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100617 struct sh_cmt_channel *ch = cs_to_sh_cmt(cs);
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000618 unsigned long flags, raw;
619 unsigned long value;
620 int has_wrapped;
621
Laurent Pinchart7269f932014-01-27 15:29:19 +0100622 raw_spin_lock_irqsave(&ch->lock, flags);
623 value = ch->total_cycles;
624 raw = sh_cmt_get_counter(ch, &has_wrapped);
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000625
626 if (unlikely(has_wrapped))
Laurent Pinchart7269f932014-01-27 15:29:19 +0100627 raw += ch->match_value + 1;
628 raw_spin_unlock_irqrestore(&ch->lock, flags);
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000629
630 return value + raw;
631}
632
633static int sh_cmt_clocksource_enable(struct clocksource *cs)
634{
Magnus Damm3593f5f2011-04-25 22:32:11 +0900635 int ret;
Laurent Pinchart7269f932014-01-27 15:29:19 +0100636 struct sh_cmt_channel *ch = cs_to_sh_cmt(cs);
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000637
Laurent Pinchart7269f932014-01-27 15:29:19 +0100638 WARN_ON(ch->cs_enabled);
Rafael J. Wysockibad81382012-08-06 01:48:57 +0200639
Laurent Pinchart7269f932014-01-27 15:29:19 +0100640 ch->total_cycles = 0;
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000641
Laurent Pinchart7269f932014-01-27 15:29:19 +0100642 ret = sh_cmt_start(ch, FLAG_CLOCKSOURCE);
Rafael J. Wysockibad81382012-08-06 01:48:57 +0200643 if (!ret) {
John Stultzfba9e072015-03-11 21:16:40 -0700644 __clocksource_update_freq_hz(cs, ch->rate);
Laurent Pinchart7269f932014-01-27 15:29:19 +0100645 ch->cs_enabled = true;
Rafael J. Wysockibad81382012-08-06 01:48:57 +0200646 }
Magnus Damm3593f5f2011-04-25 22:32:11 +0900647 return ret;
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000648}
649
650static void sh_cmt_clocksource_disable(struct clocksource *cs)
651{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100652 struct sh_cmt_channel *ch = cs_to_sh_cmt(cs);
Rafael J. Wysockibad81382012-08-06 01:48:57 +0200653
Laurent Pinchart7269f932014-01-27 15:29:19 +0100654 WARN_ON(!ch->cs_enabled);
Rafael J. Wysockibad81382012-08-06 01:48:57 +0200655
Laurent Pinchart7269f932014-01-27 15:29:19 +0100656 sh_cmt_stop(ch, FLAG_CLOCKSOURCE);
657 ch->cs_enabled = false;
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000658}
659
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +0200660static void sh_cmt_clocksource_suspend(struct clocksource *cs)
661{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100662 struct sh_cmt_channel *ch = cs_to_sh_cmt(cs);
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +0200663
Geert Uytterhoeven54d46b72015-08-06 17:32:06 +0200664 if (!ch->cs_enabled)
665 return;
666
Laurent Pinchart7269f932014-01-27 15:29:19 +0100667 sh_cmt_stop(ch, FLAG_CLOCKSOURCE);
668 pm_genpd_syscore_poweroff(&ch->cmt->pdev->dev);
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +0200669}
670
Magnus Dammc8162882010-02-02 14:41:40 -0800671static void sh_cmt_clocksource_resume(struct clocksource *cs)
672{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100673 struct sh_cmt_channel *ch = cs_to_sh_cmt(cs);
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +0200674
Geert Uytterhoeven54d46b72015-08-06 17:32:06 +0200675 if (!ch->cs_enabled)
676 return;
677
Laurent Pinchart7269f932014-01-27 15:29:19 +0100678 pm_genpd_syscore_poweron(&ch->cmt->pdev->dev);
679 sh_cmt_start(ch, FLAG_CLOCKSOURCE);
Magnus Dammc8162882010-02-02 14:41:40 -0800680}
681
Laurent Pinchart7269f932014-01-27 15:29:19 +0100682static int sh_cmt_register_clocksource(struct sh_cmt_channel *ch,
Laurent Pinchartfb28a652014-02-19 17:00:31 +0100683 const char *name)
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000684{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100685 struct clocksource *cs = &ch->cs;
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000686
687 cs->name = name;
Laurent Pinchartfb28a652014-02-19 17:00:31 +0100688 cs->rating = 125;
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000689 cs->read = sh_cmt_clocksource_read;
690 cs->enable = sh_cmt_clocksource_enable;
691 cs->disable = sh_cmt_clocksource_disable;
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +0200692 cs->suspend = sh_cmt_clocksource_suspend;
Magnus Dammc8162882010-02-02 14:41:40 -0800693 cs->resume = sh_cmt_clocksource_resume;
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000694 cs->mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
695 cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
Paul Mundtf4d7c352010-06-02 17:10:44 +0900696
Laurent Pinchart740a9512014-01-27 22:04:17 +0100697 dev_info(&ch->cmt->pdev->dev, "ch%u: used as clock source\n",
698 ch->index);
Paul Mundtf4d7c352010-06-02 17:10:44 +0900699
Magnus Damm3593f5f2011-04-25 22:32:11 +0900700 /* Register with dummy 1 Hz value, gets updated in ->enable() */
701 clocksource_register_hz(cs, 1);
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000702 return 0;
703}
704
Laurent Pinchart7269f932014-01-27 15:29:19 +0100705static struct sh_cmt_channel *ced_to_sh_cmt(struct clock_event_device *ced)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000706{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100707 return container_of(ced, struct sh_cmt_channel, ced);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000708}
709
Laurent Pinchart7269f932014-01-27 15:29:19 +0100710static void sh_cmt_clock_event_start(struct sh_cmt_channel *ch, int periodic)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000711{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100712 struct clock_event_device *ced = &ch->ced;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000713
Laurent Pinchart7269f932014-01-27 15:29:19 +0100714 sh_cmt_start(ch, FLAG_CLOCKEVENT);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000715
716 /* TODO: calculate good shift from rate and counter bit width */
717
718 ced->shift = 32;
Laurent Pinchart7269f932014-01-27 15:29:19 +0100719 ced->mult = div_sc(ch->rate, NSEC_PER_SEC, ced->shift);
720 ced->max_delta_ns = clockevent_delta2ns(ch->max_match_value, ced);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000721 ced->min_delta_ns = clockevent_delta2ns(0x1f, ced);
722
723 if (periodic)
Laurent Pinchart7269f932014-01-27 15:29:19 +0100724 sh_cmt_set_next(ch, ((ch->rate + HZ/2) / HZ) - 1);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000725 else
Laurent Pinchart7269f932014-01-27 15:29:19 +0100726 sh_cmt_set_next(ch, ch->max_match_value);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000727}
728
Viresh Kumar051b7822015-06-18 16:24:34 +0530729static int sh_cmt_clock_event_shutdown(struct clock_event_device *ced)
730{
731 struct sh_cmt_channel *ch = ced_to_sh_cmt(ced);
732
733 sh_cmt_stop(ch, FLAG_CLOCKEVENT);
734 return 0;
735}
736
737static int sh_cmt_clock_event_set_state(struct clock_event_device *ced,
738 int periodic)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000739{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100740 struct sh_cmt_channel *ch = ced_to_sh_cmt(ced);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000741
742 /* deal with old setting first */
Viresh Kumar051b7822015-06-18 16:24:34 +0530743 if (clockevent_state_oneshot(ced) || clockevent_state_periodic(ced))
Laurent Pinchart7269f932014-01-27 15:29:19 +0100744 sh_cmt_stop(ch, FLAG_CLOCKEVENT);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000745
Viresh Kumar051b7822015-06-18 16:24:34 +0530746 dev_info(&ch->cmt->pdev->dev, "ch%u: used for %s clock events\n",
747 ch->index, periodic ? "periodic" : "oneshot");
748 sh_cmt_clock_event_start(ch, periodic);
749 return 0;
750}
751
752static int sh_cmt_clock_event_set_oneshot(struct clock_event_device *ced)
753{
754 return sh_cmt_clock_event_set_state(ced, 0);
755}
756
757static int sh_cmt_clock_event_set_periodic(struct clock_event_device *ced)
758{
759 return sh_cmt_clock_event_set_state(ced, 1);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000760}
761
762static int sh_cmt_clock_event_next(unsigned long delta,
763 struct clock_event_device *ced)
764{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100765 struct sh_cmt_channel *ch = ced_to_sh_cmt(ced);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000766
Viresh Kumar051b7822015-06-18 16:24:34 +0530767 BUG_ON(!clockevent_state_oneshot(ced));
Laurent Pinchart7269f932014-01-27 15:29:19 +0100768 if (likely(ch->flags & FLAG_IRQCONTEXT))
769 ch->next_match_value = delta - 1;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000770 else
Laurent Pinchart7269f932014-01-27 15:29:19 +0100771 sh_cmt_set_next(ch, delta - 1);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000772
773 return 0;
774}
775
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +0200776static void sh_cmt_clock_event_suspend(struct clock_event_device *ced)
777{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100778 struct sh_cmt_channel *ch = ced_to_sh_cmt(ced);
Laurent Pinchart57dee992013-12-14 15:07:32 +0900779
Laurent Pinchart7269f932014-01-27 15:29:19 +0100780 pm_genpd_syscore_poweroff(&ch->cmt->pdev->dev);
781 clk_unprepare(ch->cmt->clk);
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +0200782}
783
784static void sh_cmt_clock_event_resume(struct clock_event_device *ced)
785{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100786 struct sh_cmt_channel *ch = ced_to_sh_cmt(ced);
Laurent Pinchart57dee992013-12-14 15:07:32 +0900787
Laurent Pinchart7269f932014-01-27 15:29:19 +0100788 clk_prepare(ch->cmt->clk);
789 pm_genpd_syscore_poweron(&ch->cmt->pdev->dev);
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +0200790}
791
Laurent Pinchartbfa76bb2014-02-21 01:24:47 +0100792static int sh_cmt_register_clockevent(struct sh_cmt_channel *ch,
793 const char *name)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000794{
Laurent Pinchart7269f932014-01-27 15:29:19 +0100795 struct clock_event_device *ced = &ch->ced;
Laurent Pinchartbfa76bb2014-02-21 01:24:47 +0100796 int irq;
797 int ret;
798
Laurent Pinchart31e912f2014-01-28 15:52:46 +0100799 irq = platform_get_irq(ch->cmt->pdev, ch->index);
Laurent Pinchartbfa76bb2014-02-21 01:24:47 +0100800 if (irq < 0) {
801 dev_err(&ch->cmt->pdev->dev, "ch%u: failed to get irq\n",
802 ch->index);
803 return irq;
804 }
805
806 ret = request_irq(irq, sh_cmt_interrupt,
807 IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING,
808 dev_name(&ch->cmt->pdev->dev), ch);
809 if (ret) {
810 dev_err(&ch->cmt->pdev->dev, "ch%u: failed to request irq %d\n",
811 ch->index, irq);
812 return ret;
813 }
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000814
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000815 ced->name = name;
816 ced->features = CLOCK_EVT_FEAT_PERIODIC;
817 ced->features |= CLOCK_EVT_FEAT_ONESHOT;
Laurent Pinchartb7fcbb02014-02-19 17:00:31 +0100818 ced->rating = 125;
Laurent Pinchartf1ebe1e2014-02-19 16:19:44 +0100819 ced->cpumask = cpu_possible_mask;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000820 ced->set_next_event = sh_cmt_clock_event_next;
Viresh Kumar051b7822015-06-18 16:24:34 +0530821 ced->set_state_shutdown = sh_cmt_clock_event_shutdown;
822 ced->set_state_periodic = sh_cmt_clock_event_set_periodic;
823 ced->set_state_oneshot = sh_cmt_clock_event_set_oneshot;
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +0200824 ced->suspend = sh_cmt_clock_event_suspend;
825 ced->resume = sh_cmt_clock_event_resume;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000826
Laurent Pinchart740a9512014-01-27 22:04:17 +0100827 dev_info(&ch->cmt->pdev->dev, "ch%u: used for clock events\n",
828 ch->index);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000829 clockevents_register_device(ced);
Laurent Pinchartbfa76bb2014-02-21 01:24:47 +0100830
831 return 0;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000832}
833
Laurent Pinchart1d053e12014-02-17 16:04:16 +0100834static int sh_cmt_register(struct sh_cmt_channel *ch, const char *name,
Laurent Pinchartfb28a652014-02-19 17:00:31 +0100835 bool clockevent, bool clocksource)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000836{
Laurent Pinchartbfa76bb2014-02-21 01:24:47 +0100837 int ret;
838
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100839 if (clockevent) {
840 ch->cmt->has_clockevent = true;
Laurent Pinchartbfa76bb2014-02-21 01:24:47 +0100841 ret = sh_cmt_register_clockevent(ch, name);
842 if (ret < 0)
843 return ret;
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100844 }
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000845
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100846 if (clocksource) {
847 ch->cmt->has_clocksource = true;
Laurent Pinchartfb28a652014-02-19 17:00:31 +0100848 sh_cmt_register_clocksource(ch, name);
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100849 }
Magnus Damm19bdc9d2009-04-17 05:26:31 +0000850
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000851 return 0;
852}
853
Laurent Pinchart740a9512014-01-27 22:04:17 +0100854static int sh_cmt_setup_channel(struct sh_cmt_channel *ch, unsigned int index,
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100855 unsigned int hwidx, bool clockevent,
856 bool clocksource, struct sh_cmt_device *cmt)
Laurent Pinchartb882e7b2014-01-27 22:04:17 +0100857{
Laurent Pinchartb882e7b2014-01-27 22:04:17 +0100858 int ret;
859
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100860 /* Skip unused channels. */
861 if (!clockevent && !clocksource)
862 return 0;
Laurent Pinchartb882e7b2014-01-27 22:04:17 +0100863
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100864 ch->cmt = cmt;
865 ch->index = index;
866 ch->hwidx = hwidx;
867
868 /*
869 * Compute the address of the channel control register block. For the
870 * timers with a per-channel start/stop register, compute its address
871 * as well.
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100872 */
Laurent Pinchart31e912f2014-01-28 15:52:46 +0100873 switch (cmt->info->model) {
874 case SH_CMT_16BIT:
875 ch->ioctrl = cmt->mapbase + 2 + ch->hwidx * 6;
876 break;
877 case SH_CMT_32BIT:
878 case SH_CMT_48BIT:
879 ch->ioctrl = cmt->mapbase + 0x10 + ch->hwidx * 0x10;
880 break;
881 case SH_CMT_32BIT_FAST:
882 /*
883 * The 32-bit "fast" timer has a single channel at hwidx 5 but
884 * is located at offset 0x40 instead of 0x60 for some reason.
885 */
886 ch->ioctrl = cmt->mapbase + 0x40;
887 break;
888 case SH_CMT_48BIT_GEN2:
889 ch->iostart = cmt->mapbase + ch->hwidx * 0x100;
890 ch->ioctrl = ch->iostart + 0x10;
891 break;
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100892 }
893
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100894 if (cmt->info->width == (sizeof(ch->max_match_value) * 8))
Laurent Pinchartb882e7b2014-01-27 22:04:17 +0100895 ch->max_match_value = ~0;
896 else
Laurent Pinchart2cda3ac2014-02-11 23:46:48 +0100897 ch->max_match_value = (1 << cmt->info->width) - 1;
Laurent Pinchartb882e7b2014-01-27 22:04:17 +0100898
899 ch->match_value = ch->max_match_value;
900 raw_spin_lock_init(&ch->lock);
901
Laurent Pinchart31e912f2014-01-28 15:52:46 +0100902 ch->timer_bit = cmt->info->model == SH_CMT_48BIT_GEN2 ? 0 : ch->hwidx;
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100903
Laurent Pinchart1d053e12014-02-17 16:04:16 +0100904 ret = sh_cmt_register(ch, dev_name(&cmt->pdev->dev),
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100905 clockevent, clocksource);
Laurent Pinchartb882e7b2014-01-27 22:04:17 +0100906 if (ret) {
Laurent Pinchart740a9512014-01-27 22:04:17 +0100907 dev_err(&cmt->pdev->dev, "ch%u: registration failed\n",
908 ch->index);
Laurent Pinchartb882e7b2014-01-27 22:04:17 +0100909 return ret;
910 }
911 ch->cs_enabled = false;
912
Laurent Pinchartb882e7b2014-01-27 22:04:17 +0100913 return 0;
914}
915
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100916static int sh_cmt_map_memory(struct sh_cmt_device *cmt)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000917{
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100918 struct resource *mem;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000919
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100920 mem = platform_get_resource(cmt->pdev, IORESOURCE_MEM, 0);
921 if (!mem) {
922 dev_err(&cmt->pdev->dev, "failed to get I/O memory\n");
923 return -ENXIO;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +0000924 }
925
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100926 cmt->mapbase = ioremap_nocache(mem->start, resource_size(mem));
927 if (cmt->mapbase == NULL) {
928 dev_err(&cmt->pdev->dev, "failed to remap I/O memory\n");
929 return -ENXIO;
930 }
931
932 return 0;
933}
934
Laurent Pinchart1768aa22014-02-12 17:12:40 +0100935static const struct platform_device_id sh_cmt_id_table[] = {
936 { "sh-cmt-16", (kernel_ulong_t)&sh_cmt_info[SH_CMT_16BIT] },
937 { "sh-cmt-32", (kernel_ulong_t)&sh_cmt_info[SH_CMT_32BIT] },
Laurent Pinchart1768aa22014-02-12 17:12:40 +0100938 { }
939};
940MODULE_DEVICE_TABLE(platform, sh_cmt_id_table);
941
942static const struct of_device_id sh_cmt_of_table[] __maybe_unused = {
943 { .compatible = "renesas,cmt-32", .data = &sh_cmt_info[SH_CMT_32BIT] },
944 { .compatible = "renesas,cmt-32-fast", .data = &sh_cmt_info[SH_CMT_32BIT_FAST] },
945 { .compatible = "renesas,cmt-48", .data = &sh_cmt_info[SH_CMT_48BIT] },
946 { .compatible = "renesas,cmt-48-gen2", .data = &sh_cmt_info[SH_CMT_48BIT_GEN2] },
947 { }
948};
949MODULE_DEVICE_TABLE(of, sh_cmt_of_table);
950
951static int sh_cmt_parse_dt(struct sh_cmt_device *cmt)
952{
953 struct device_node *np = cmt->pdev->dev.of_node;
954
955 return of_property_read_u32(np, "renesas,channels-mask",
956 &cmt->hw_channels);
957}
958
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100959static int sh_cmt_setup(struct sh_cmt_device *cmt, struct platform_device *pdev)
960{
Laurent Pinchart31e912f2014-01-28 15:52:46 +0100961 unsigned int mask;
962 unsigned int i;
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100963 int ret;
964
965 memset(cmt, 0, sizeof(*cmt));
966 cmt->pdev = pdev;
Laurent Pinchartde599c82014-02-17 16:49:05 +0100967 raw_spin_lock_init(&cmt->lock);
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100968
Laurent Pinchart1768aa22014-02-12 17:12:40 +0100969 if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
970 const struct of_device_id *id;
971
972 id = of_match_node(sh_cmt_of_table, pdev->dev.of_node);
973 cmt->info = id->data;
974
975 ret = sh_cmt_parse_dt(cmt);
976 if (ret < 0)
977 return ret;
978 } else if (pdev->dev.platform_data) {
979 struct sh_timer_config *cfg = pdev->dev.platform_data;
980 const struct platform_device_id *id = pdev->id_entry;
981
982 cmt->info = (const struct sh_cmt_info *)id->driver_data;
983 cmt->hw_channels = cfg->channels_mask;
984 } else {
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100985 dev_err(&cmt->pdev->dev, "missing platform data\n");
986 return -ENXIO;
Laurent Pinchartf5ec9b12014-01-27 22:04:17 +0100987 }
988
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100989 /* Get hold of clock. */
Laurent Pinchart31e912f2014-01-28 15:52:46 +0100990 cmt->clk = clk_get(&cmt->pdev->dev, "fck");
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100991 if (IS_ERR(cmt->clk)) {
992 dev_err(&cmt->pdev->dev, "cannot get clock\n");
993 return PTR_ERR(cmt->clk);
994 }
995
996 ret = clk_prepare(cmt->clk);
Laurent Pinchartb882e7b2014-01-27 22:04:17 +0100997 if (ret < 0)
Laurent Pinchart81b3b272014-01-28 12:36:48 +0100998 goto err_clk_put;
999
Laurent Pinchart31e912f2014-01-28 15:52:46 +01001000 /* Map the memory resource(s). */
1001 ret = sh_cmt_map_memory(cmt);
Laurent Pinchart81b3b272014-01-28 12:36:48 +01001002 if (ret < 0)
1003 goto err_clk_unprepare;
1004
1005 /* Allocate and setup the channels. */
Laurent Pinchart1768aa22014-02-12 17:12:40 +01001006 cmt->num_channels = hweight8(cmt->hw_channels);
Laurent Pinchart81b3b272014-01-28 12:36:48 +01001007 cmt->channels = kzalloc(cmt->num_channels * sizeof(*cmt->channels),
1008 GFP_KERNEL);
1009 if (cmt->channels == NULL) {
1010 ret = -ENOMEM;
1011 goto err_unmap;
1012 }
1013
Laurent Pinchart31e912f2014-01-28 15:52:46 +01001014 /*
1015 * Use the first channel as a clock event device and the second channel
1016 * as a clock source. If only one channel is available use it for both.
1017 */
Laurent Pinchart1768aa22014-02-12 17:12:40 +01001018 for (i = 0, mask = cmt->hw_channels; i < cmt->num_channels; ++i) {
Laurent Pinchart31e912f2014-01-28 15:52:46 +01001019 unsigned int hwidx = ffs(mask) - 1;
1020 bool clocksource = i == 1 || cmt->num_channels == 1;
1021 bool clockevent = i == 0;
1022
1023 ret = sh_cmt_setup_channel(&cmt->channels[i], i, hwidx,
1024 clockevent, clocksource, cmt);
Laurent Pinchart81b3b272014-01-28 12:36:48 +01001025 if (ret < 0)
1026 goto err_unmap;
Laurent Pinchart81b3b272014-01-28 12:36:48 +01001027
Laurent Pinchart31e912f2014-01-28 15:52:46 +01001028 mask &= ~(1 << hwidx);
Laurent Pinchart81b3b272014-01-28 12:36:48 +01001029 }
Paul Mundtda64c2a2010-02-25 16:37:46 +09001030
Laurent Pinchart2653caf2014-01-27 22:04:17 +01001031 platform_set_drvdata(pdev, cmt);
Magnus Dammadccc692012-12-14 14:53:51 +09001032
Paul Mundtda64c2a2010-02-25 16:37:46 +09001033 return 0;
Laurent Pinchart81b3b272014-01-28 12:36:48 +01001034
1035err_unmap:
Laurent Pinchartf5ec9b12014-01-27 22:04:17 +01001036 kfree(cmt->channels);
Laurent Pinchart31e912f2014-01-28 15:52:46 +01001037 iounmap(cmt->mapbase);
Laurent Pinchart81b3b272014-01-28 12:36:48 +01001038err_clk_unprepare:
Laurent Pinchart2653caf2014-01-27 22:04:17 +01001039 clk_unprepare(cmt->clk);
Laurent Pinchart81b3b272014-01-28 12:36:48 +01001040err_clk_put:
Laurent Pinchart2653caf2014-01-27 22:04:17 +01001041 clk_put(cmt->clk);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001042 return ret;
1043}
1044
Greg Kroah-Hartman18505142012-12-21 15:11:38 -08001045static int sh_cmt_probe(struct platform_device *pdev)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001046{
Laurent Pinchart2653caf2014-01-27 22:04:17 +01001047 struct sh_cmt_device *cmt = platform_get_drvdata(pdev);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001048 int ret;
1049
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +02001050 if (!is_early_platform_device(pdev)) {
Rafael J. Wysockibad81382012-08-06 01:48:57 +02001051 pm_runtime_set_active(&pdev->dev);
1052 pm_runtime_enable(&pdev->dev);
Rafael J. Wysocki9bb5ec82012-08-06 01:43:03 +02001053 }
Rafael J. Wysocki615a4452012-03-13 22:40:06 +01001054
Laurent Pinchart2653caf2014-01-27 22:04:17 +01001055 if (cmt) {
Paul Mundt214a6072010-03-10 16:26:25 +09001056 dev_info(&pdev->dev, "kept as earlytimer\n");
Rafael J. Wysockibad81382012-08-06 01:48:57 +02001057 goto out;
Magnus Damme475eed2009-04-15 10:50:04 +00001058 }
1059
Laurent Pinchartb262bc72014-01-27 22:04:17 +01001060 cmt = kzalloc(sizeof(*cmt), GFP_KERNEL);
Jingoo Han0178f412014-05-22 14:05:06 +02001061 if (cmt == NULL)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001062 return -ENOMEM;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001063
Laurent Pinchart2653caf2014-01-27 22:04:17 +01001064 ret = sh_cmt_setup(cmt, pdev);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001065 if (ret) {
Laurent Pinchart2653caf2014-01-27 22:04:17 +01001066 kfree(cmt);
Rafael J. Wysockibad81382012-08-06 01:48:57 +02001067 pm_runtime_idle(&pdev->dev);
1068 return ret;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001069 }
Rafael J. Wysockibad81382012-08-06 01:48:57 +02001070 if (is_early_platform_device(pdev))
1071 return 0;
1072
1073 out:
Laurent Pinchart81b3b272014-01-28 12:36:48 +01001074 if (cmt->has_clockevent || cmt->has_clocksource)
Rafael J. Wysockibad81382012-08-06 01:48:57 +02001075 pm_runtime_irq_safe(&pdev->dev);
1076 else
1077 pm_runtime_idle(&pdev->dev);
1078
1079 return 0;
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001080}
1081
Greg Kroah-Hartman18505142012-12-21 15:11:38 -08001082static int sh_cmt_remove(struct platform_device *pdev)
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001083{
1084 return -EBUSY; /* cannot unregister clockevent and clocksource */
1085}
1086
1087static struct platform_driver sh_cmt_device_driver = {
1088 .probe = sh_cmt_probe,
Greg Kroah-Hartman18505142012-12-21 15:11:38 -08001089 .remove = sh_cmt_remove,
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001090 .driver = {
1091 .name = "sh_cmt",
Laurent Pinchart1768aa22014-02-12 17:12:40 +01001092 .of_match_table = of_match_ptr(sh_cmt_of_table),
Laurent Pinchart81b3b272014-01-28 12:36:48 +01001093 },
1094 .id_table = sh_cmt_id_table,
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001095};
1096
1097static int __init sh_cmt_init(void)
1098{
1099 return platform_driver_register(&sh_cmt_device_driver);
1100}
1101
1102static void __exit sh_cmt_exit(void)
1103{
1104 platform_driver_unregister(&sh_cmt_device_driver);
1105}
1106
Magnus Damme475eed2009-04-15 10:50:04 +00001107early_platform_init("earlytimer", &sh_cmt_device_driver);
Simon Hormane903a032013-03-05 15:40:42 +09001108subsys_initcall(sh_cmt_init);
Magnus Damm3fb1b6a2009-01-22 09:55:59 +00001109module_exit(sh_cmt_exit);
1110
1111MODULE_AUTHOR("Magnus Damm");
1112MODULE_DESCRIPTION("SuperH CMT Timer Driver");
1113MODULE_LICENSE("GPL v2");