2 * SuperH Timer Support - MTU2
4 * Copyright (C) 2009 Magnus Damm
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
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22 #include <linux/spinlock.h>
23 #include <linux/interrupt.h>
24 #include <linux/ioport.h>
25 #include <linux/delay.h>
27 #include <linux/clk.h>
28 #include <linux/irq.h>
29 #include <linux/err.h>
30 #include <linux/clockchips.h>
31 #include <linux/sh_timer.h>
32 #include <linux/slab.h>
33 #include <linux/module.h>
34 #include <linux/pm_domain.h>
35 #include <linux/pm_runtime.h>
37 struct sh_mtu2_device;
39 struct sh_mtu2_channel {
40 struct sh_mtu2_device *mtu;
46 struct clock_event_device ced;
49 struct sh_mtu2_device {
50 struct platform_device *pdev;
52 void __iomem *mapbase;
55 struct sh_mtu2_channel *channels;
56 unsigned int num_channels;
59 static DEFINE_RAW_SPINLOCK(sh_mtu2_lock);
61 #define TSTR -1 /* shared register */
62 #define TCR 0 /* channel register */
63 #define TMDR 1 /* channel register */
64 #define TIOR 2 /* channel register */
65 #define TIER 3 /* channel register */
66 #define TSR 4 /* channel register */
67 #define TCNT 5 /* channel register */
68 #define TGR 6 /* channel register */
70 #define TCR_CCLR_NONE (0 << 5)
71 #define TCR_CCLR_TGRA (1 << 5)
72 #define TCR_CCLR_TGRB (2 << 5)
73 #define TCR_CCLR_SYNC (3 << 5)
74 #define TCR_CCLR_TGRC (5 << 5)
75 #define TCR_CCLR_TGRD (6 << 5)
76 #define TCR_CCLR_MASK (7 << 5)
77 #define TCR_CKEG_RISING (0 << 3)
78 #define TCR_CKEG_FALLING (1 << 3)
79 #define TCR_CKEG_BOTH (2 << 3)
80 #define TCR_CKEG_MASK (3 << 3)
81 /* Values 4 to 7 are channel-dependent */
82 #define TCR_TPSC_P1 (0 << 0)
83 #define TCR_TPSC_P4 (1 << 0)
84 #define TCR_TPSC_P16 (2 << 0)
85 #define TCR_TPSC_P64 (3 << 0)
86 #define TCR_TPSC_CH0_TCLKA (4 << 0)
87 #define TCR_TPSC_CH0_TCLKB (5 << 0)
88 #define TCR_TPSC_CH0_TCLKC (6 << 0)
89 #define TCR_TPSC_CH0_TCLKD (7 << 0)
90 #define TCR_TPSC_CH1_TCLKA (4 << 0)
91 #define TCR_TPSC_CH1_TCLKB (5 << 0)
92 #define TCR_TPSC_CH1_P256 (6 << 0)
93 #define TCR_TPSC_CH1_TCNT2 (7 << 0)
94 #define TCR_TPSC_CH2_TCLKA (4 << 0)
95 #define TCR_TPSC_CH2_TCLKB (5 << 0)
96 #define TCR_TPSC_CH2_TCLKC (6 << 0)
97 #define TCR_TPSC_CH2_P1024 (7 << 0)
98 #define TCR_TPSC_CH34_P256 (4 << 0)
99 #define TCR_TPSC_CH34_P1024 (5 << 0)
100 #define TCR_TPSC_CH34_TCLKA (6 << 0)
101 #define TCR_TPSC_CH34_TCLKB (7 << 0)
102 #define TCR_TPSC_MASK (7 << 0)
104 #define TMDR_BFE (1 << 6)
105 #define TMDR_BFB (1 << 5)
106 #define TMDR_BFA (1 << 4)
107 #define TMDR_MD_NORMAL (0 << 0)
108 #define TMDR_MD_PWM_1 (2 << 0)
109 #define TMDR_MD_PWM_2 (3 << 0)
110 #define TMDR_MD_PHASE_1 (4 << 0)
111 #define TMDR_MD_PHASE_2 (5 << 0)
112 #define TMDR_MD_PHASE_3 (6 << 0)
113 #define TMDR_MD_PHASE_4 (7 << 0)
114 #define TMDR_MD_PWM_SYNC (8 << 0)
115 #define TMDR_MD_PWM_COMP_CREST (13 << 0)
116 #define TMDR_MD_PWM_COMP_TROUGH (14 << 0)
117 #define TMDR_MD_PWM_COMP_BOTH (15 << 0)
118 #define TMDR_MD_MASK (15 << 0)
120 #define TIOC_IOCH(n) ((n) << 4)
121 #define TIOC_IOCL(n) ((n) << 0)
122 #define TIOR_OC_RETAIN (0 << 0)
123 #define TIOR_OC_0_CLEAR (1 << 0)
124 #define TIOR_OC_0_SET (2 << 0)
125 #define TIOR_OC_0_TOGGLE (3 << 0)
126 #define TIOR_OC_1_CLEAR (5 << 0)
127 #define TIOR_OC_1_SET (6 << 0)
128 #define TIOR_OC_1_TOGGLE (7 << 0)
129 #define TIOR_IC_RISING (8 << 0)
130 #define TIOR_IC_FALLING (9 << 0)
131 #define TIOR_IC_BOTH (10 << 0)
132 #define TIOR_IC_TCNT (12 << 0)
133 #define TIOR_MASK (15 << 0)
135 #define TIER_TTGE (1 << 7)
136 #define TIER_TTGE2 (1 << 6)
137 #define TIER_TCIEU (1 << 5)
138 #define TIER_TCIEV (1 << 4)
139 #define TIER_TGIED (1 << 3)
140 #define TIER_TGIEC (1 << 2)
141 #define TIER_TGIEB (1 << 1)
142 #define TIER_TGIEA (1 << 0)
144 #define TSR_TCFD (1 << 7)
145 #define TSR_TCFU (1 << 5)
146 #define TSR_TCFV (1 << 4)
147 #define TSR_TGFD (1 << 3)
148 #define TSR_TGFC (1 << 2)
149 #define TSR_TGFB (1 << 1)
150 #define TSR_TGFA (1 << 0)
152 static unsigned long mtu2_reg_offs[] = {
162 static inline unsigned long sh_mtu2_read(struct sh_mtu2_channel *ch, int reg_nr)
167 return ioread8(ch->mtu->mapbase);
169 offs = mtu2_reg_offs[reg_nr];
171 if ((reg_nr == TCNT) || (reg_nr == TGR))
172 return ioread16(ch->base + offs);
174 return ioread8(ch->base + offs);
177 static inline void sh_mtu2_write(struct sh_mtu2_channel *ch, int reg_nr,
182 if (reg_nr == TSTR) {
183 iowrite8(value, ch->mtu->mapbase);
187 offs = mtu2_reg_offs[reg_nr];
189 if ((reg_nr == TCNT) || (reg_nr == TGR))
190 iowrite16(value, ch->base + offs);
192 iowrite8(value, ch->base + offs);
195 static void sh_mtu2_start_stop_ch(struct sh_mtu2_channel *ch, int start)
197 unsigned long flags, value;
199 /* start stop register shared by multiple timer channels */
200 raw_spin_lock_irqsave(&sh_mtu2_lock, flags);
201 value = sh_mtu2_read(ch, TSTR);
204 value |= 1 << ch->index;
206 value &= ~(1 << ch->index);
208 sh_mtu2_write(ch, TSTR, value);
209 raw_spin_unlock_irqrestore(&sh_mtu2_lock, flags);
212 static int sh_mtu2_enable(struct sh_mtu2_channel *ch)
214 unsigned long periodic;
218 pm_runtime_get_sync(&ch->mtu->pdev->dev);
219 dev_pm_syscore_device(&ch->mtu->pdev->dev, true);
222 ret = clk_enable(ch->mtu->clk);
224 dev_err(&ch->mtu->pdev->dev, "ch%u: cannot enable clock\n",
229 /* make sure channel is disabled */
230 sh_mtu2_start_stop_ch(ch, 0);
232 rate = clk_get_rate(ch->mtu->clk) / 64;
233 periodic = (rate + HZ/2) / HZ;
236 * "Periodic Counter Operation"
237 * Clear on TGRA compare match, divide clock by 64.
239 sh_mtu2_write(ch, TCR, TCR_CCLR_TGRA | TCR_TPSC_P64);
240 sh_mtu2_write(ch, TIOR, TIOC_IOCH(TIOR_OC_0_CLEAR) |
241 TIOC_IOCL(TIOR_OC_0_CLEAR));
242 sh_mtu2_write(ch, TGR, periodic);
243 sh_mtu2_write(ch, TCNT, 0);
244 sh_mtu2_write(ch, TMDR, TMDR_MD_NORMAL);
245 sh_mtu2_write(ch, TIER, TIER_TGIEA);
248 sh_mtu2_start_stop_ch(ch, 1);
253 static void sh_mtu2_disable(struct sh_mtu2_channel *ch)
255 /* disable channel */
256 sh_mtu2_start_stop_ch(ch, 0);
259 clk_disable(ch->mtu->clk);
261 dev_pm_syscore_device(&ch->mtu->pdev->dev, false);
262 pm_runtime_put(&ch->mtu->pdev->dev);
265 static irqreturn_t sh_mtu2_interrupt(int irq, void *dev_id)
267 struct sh_mtu2_channel *ch = dev_id;
269 /* acknowledge interrupt */
270 sh_mtu2_read(ch, TSR);
271 sh_mtu2_write(ch, TSR, ~TSR_TGFA);
273 /* notify clockevent layer */
274 ch->ced.event_handler(&ch->ced);
278 static struct sh_mtu2_channel *ced_to_sh_mtu2(struct clock_event_device *ced)
280 return container_of(ced, struct sh_mtu2_channel, ced);
283 static void sh_mtu2_clock_event_mode(enum clock_event_mode mode,
284 struct clock_event_device *ced)
286 struct sh_mtu2_channel *ch = ced_to_sh_mtu2(ced);
289 /* deal with old setting first */
291 case CLOCK_EVT_MODE_PERIODIC:
300 case CLOCK_EVT_MODE_PERIODIC:
301 dev_info(&ch->mtu->pdev->dev,
302 "ch%u: used for periodic clock events\n", ch->index);
305 case CLOCK_EVT_MODE_UNUSED:
309 case CLOCK_EVT_MODE_SHUTDOWN:
315 static void sh_mtu2_clock_event_suspend(struct clock_event_device *ced)
317 pm_genpd_syscore_poweroff(&ced_to_sh_mtu2(ced)->mtu->pdev->dev);
320 static void sh_mtu2_clock_event_resume(struct clock_event_device *ced)
322 pm_genpd_syscore_poweron(&ced_to_sh_mtu2(ced)->mtu->pdev->dev);
325 static void sh_mtu2_register_clockevent(struct sh_mtu2_channel *ch,
328 struct clock_event_device *ced = &ch->ced;
332 ced->features = CLOCK_EVT_FEAT_PERIODIC;
334 ced->cpumask = cpu_possible_mask;
335 ced->set_mode = sh_mtu2_clock_event_mode;
336 ced->suspend = sh_mtu2_clock_event_suspend;
337 ced->resume = sh_mtu2_clock_event_resume;
339 dev_info(&ch->mtu->pdev->dev, "ch%u: used for clock events\n",
341 clockevents_register_device(ced);
343 ret = request_irq(ch->irq, sh_mtu2_interrupt,
344 IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING,
345 dev_name(&ch->mtu->pdev->dev), ch);
347 dev_err(&ch->mtu->pdev->dev, "ch%u: failed to request irq %d\n",
353 static int sh_mtu2_register(struct sh_mtu2_channel *ch, const char *name,
357 sh_mtu2_register_clockevent(ch, name);
362 static int sh_mtu2_setup_channel(struct sh_mtu2_channel *ch,
363 struct sh_mtu2_device *mtu)
365 struct sh_timer_config *cfg = mtu->pdev->dev.platform_data;
368 ch->index = cfg->timer_bit;
370 ch->irq = platform_get_irq(mtu->pdev, 0);
372 dev_err(&mtu->pdev->dev, "ch%u: failed to get irq\n",
377 return sh_mtu2_register(ch, dev_name(&mtu->pdev->dev),
378 cfg->clockevent_rating != 0);
381 static int sh_mtu2_setup(struct sh_mtu2_device *mtu,
382 struct platform_device *pdev)
384 struct sh_timer_config *cfg = pdev->dev.platform_data;
385 struct resource *res;
393 dev_err(&mtu->pdev->dev, "missing platform data\n");
397 platform_set_drvdata(pdev, mtu);
399 res = platform_get_resource(mtu->pdev, IORESOURCE_MEM, 0);
401 dev_err(&mtu->pdev->dev, "failed to get I/O memory\n");
406 * Map memory, let base point to our channel and mapbase to the
407 * start/stop shared register.
409 base = ioremap_nocache(res->start, resource_size(res));
411 dev_err(&mtu->pdev->dev, "failed to remap I/O memory\n");
415 mtu->mapbase = base + cfg->channel_offset;
417 /* get hold of clock */
418 mtu->clk = clk_get(&mtu->pdev->dev, "mtu2_fck");
419 if (IS_ERR(mtu->clk)) {
420 dev_err(&mtu->pdev->dev, "cannot get clock\n");
421 ret = PTR_ERR(mtu->clk);
425 ret = clk_prepare(mtu->clk);
429 mtu->channels = kzalloc(sizeof(*mtu->channels), GFP_KERNEL);
430 if (mtu->channels == NULL) {
435 mtu->num_channels = 1;
437 mtu->channels[0].base = base;
439 ret = sh_mtu2_setup_channel(&mtu->channels[0], mtu);
445 kfree(mtu->channels);
446 clk_unprepare(mtu->clk);
455 static int sh_mtu2_probe(struct platform_device *pdev)
457 struct sh_mtu2_device *mtu = platform_get_drvdata(pdev);
458 struct sh_timer_config *cfg = pdev->dev.platform_data;
461 if (!is_early_platform_device(pdev)) {
462 pm_runtime_set_active(&pdev->dev);
463 pm_runtime_enable(&pdev->dev);
467 dev_info(&pdev->dev, "kept as earlytimer\n");
471 mtu = kzalloc(sizeof(*mtu), GFP_KERNEL);
473 dev_err(&pdev->dev, "failed to allocate driver data\n");
477 ret = sh_mtu2_setup(mtu, pdev);
480 pm_runtime_idle(&pdev->dev);
483 if (is_early_platform_device(pdev))
487 if (cfg->clockevent_rating)
488 pm_runtime_irq_safe(&pdev->dev);
490 pm_runtime_idle(&pdev->dev);
495 static int sh_mtu2_remove(struct platform_device *pdev)
497 return -EBUSY; /* cannot unregister clockevent */
500 static struct platform_driver sh_mtu2_device_driver = {
501 .probe = sh_mtu2_probe,
502 .remove = sh_mtu2_remove,
508 static int __init sh_mtu2_init(void)
510 return platform_driver_register(&sh_mtu2_device_driver);
513 static void __exit sh_mtu2_exit(void)
515 platform_driver_unregister(&sh_mtu2_device_driver);
518 early_platform_init("earlytimer", &sh_mtu2_device_driver);
519 subsys_initcall(sh_mtu2_init);
520 module_exit(sh_mtu2_exit);
522 MODULE_AUTHOR("Magnus Damm");
523 MODULE_DESCRIPTION("SuperH MTU2 Timer Driver");
524 MODULE_LICENSE("GPL v2");