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1/*
2 * SuperH Timer Support - MTU2
3 *
4 * Copyright (C) 2009 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.
14 *
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
18 */
19
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>
26#include <linux/io.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
34struct sh_mtu2_priv {
35 void __iomem *mapbase;
36 struct clk *clk;
37 struct irqaction irqaction;
38 struct platform_device *pdev;
39 unsigned long rate;
40 unsigned long periodic;
41 struct clock_event_device ced;
42};
43
44static DEFINE_SPINLOCK(sh_mtu2_lock);
45
46#define TSTR -1 /* shared register */
47#define TCR 0 /* channel register */
48#define TMDR 1 /* channel register */
49#define TIOR 2 /* channel register */
50#define TIER 3 /* channel register */
51#define TSR 4 /* channel register */
52#define TCNT 5 /* channel register */
53#define TGR 6 /* channel register */
54
55static unsigned long mtu2_reg_offs[] = {
56 [TCR] = 0,
57 [TMDR] = 1,
58 [TIOR] = 2,
59 [TIER] = 4,
60 [TSR] = 5,
61 [TCNT] = 6,
62 [TGR] = 8,
63};
64
65static inline unsigned long sh_mtu2_read(struct sh_mtu2_priv *p, int reg_nr)
66{
67 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
68 void __iomem *base = p->mapbase;
69 unsigned long offs;
70
71 if (reg_nr == TSTR)
72 return ioread8(base + cfg->channel_offset);
73
74 offs = mtu2_reg_offs[reg_nr];
75
76 if ((reg_nr == TCNT) || (reg_nr == TGR))
77 return ioread16(base + offs);
78 else
79 return ioread8(base + offs);
80}
81
82static inline void sh_mtu2_write(struct sh_mtu2_priv *p, int reg_nr,
83 unsigned long value)
84{
85 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
86 void __iomem *base = p->mapbase;
87 unsigned long offs;
88
89 if (reg_nr == TSTR) {
90 iowrite8(value, base + cfg->channel_offset);
91 return;
92 }
93
94 offs = mtu2_reg_offs[reg_nr];
95
96 if ((reg_nr == TCNT) || (reg_nr == TGR))
97 iowrite16(value, base + offs);
98 else
99 iowrite8(value, base + offs);
100}
101
102static void sh_mtu2_start_stop_ch(struct sh_mtu2_priv *p, int start)
103{
104 struct sh_timer_config *cfg = p->pdev->dev.platform_data;
105 unsigned long flags, value;
106
107 /* start stop register shared by multiple timer channels */
108 spin_lock_irqsave(&sh_mtu2_lock, flags);
109 value = sh_mtu2_read(p, TSTR);
110
111 if (start)
112 value |= 1 << cfg->timer_bit;
113 else
114 value &= ~(1 << cfg->timer_bit);
115
116 sh_mtu2_write(p, TSTR, value);
117 spin_unlock_irqrestore(&sh_mtu2_lock, flags);
118}
119
120static int sh_mtu2_enable(struct sh_mtu2_priv *p)
121{
122 int ret;
123
124 /* enable clock */
125 ret = clk_enable(p->clk);
126 if (ret) {
127 dev_err(&p->pdev->dev, "cannot enable clock\n");
128 return ret;
129 }
130
131 /* make sure channel is disabled */
132 sh_mtu2_start_stop_ch(p, 0);
133
134 p->rate = clk_get_rate(p->clk) / 64;
135 p->periodic = (p->rate + HZ/2) / HZ;
136
137 /* "Periodic Counter Operation" */
138 sh_mtu2_write(p, TCR, 0x23); /* TGRA clear, divide clock by 64 */
139 sh_mtu2_write(p, TIOR, 0);
140 sh_mtu2_write(p, TGR, p->periodic);
141 sh_mtu2_write(p, TCNT, 0);
142 sh_mtu2_write(p, TMDR, 0);
143 sh_mtu2_write(p, TIER, 0x01);
144
145 /* enable channel */
146 sh_mtu2_start_stop_ch(p, 1);
147
148 return 0;
149}
150
151static void sh_mtu2_disable(struct sh_mtu2_priv *p)
152{
153 /* disable channel */
154 sh_mtu2_start_stop_ch(p, 0);
155
156 /* stop clock */
157 clk_disable(p->clk);
158}
159
160static irqreturn_t sh_mtu2_interrupt(int irq, void *dev_id)
161{
162 struct sh_mtu2_priv *p = dev_id;
163
164 /* acknowledge interrupt */
165 sh_mtu2_read(p, TSR);
166 sh_mtu2_write(p, TSR, 0xfe);
167
168 /* notify clockevent layer */
169 p->ced.event_handler(&p->ced);
170 return IRQ_HANDLED;
171}
172
173static struct sh_mtu2_priv *ced_to_sh_mtu2(struct clock_event_device *ced)
174{
175 return container_of(ced, struct sh_mtu2_priv, ced);
176}
177
178static void sh_mtu2_clock_event_mode(enum clock_event_mode mode,
179 struct clock_event_device *ced)
180{
181 struct sh_mtu2_priv *p = ced_to_sh_mtu2(ced);
182 int disabled = 0;
183
184 /* deal with old setting first */
185 switch (ced->mode) {
186 case CLOCK_EVT_MODE_PERIODIC:
187 sh_mtu2_disable(p);
188 disabled = 1;
189 break;
190 default:
191 break;
192 }
193
194 switch (mode) {
195 case CLOCK_EVT_MODE_PERIODIC:
196 dev_info(&p->pdev->dev, "used for periodic clock events\n");
197 sh_mtu2_enable(p);
198 break;
199 case CLOCK_EVT_MODE_UNUSED:
200 if (!disabled)
201 sh_mtu2_disable(p);
202 break;
203 case CLOCK_EVT_MODE_SHUTDOWN:
204 default:
205 break;
206 }
207}
208
209static void sh_mtu2_register_clockevent(struct sh_mtu2_priv *p,
210 char *name, unsigned long rating)
211{
212 struct clock_event_device *ced = &p->ced;
213 int ret;
214
215 memset(ced, 0, sizeof(*ced));
216
217 ced->name = name;
218 ced->features = CLOCK_EVT_FEAT_PERIODIC;
219 ced->rating = rating;
220 ced->cpumask = cpumask_of(0);
221 ced->set_mode = sh_mtu2_clock_event_mode;
222
223 dev_info(&p->pdev->dev, "used for clock events\n");
224 clockevents_register_device(ced);
225
226 ret = setup_irq(p->irqaction.irq, &p->irqaction);
227 if (ret) {
228 dev_err(&p->pdev->dev, "failed to request irq %d\n",
229 p->irqaction.irq);
230 return;
231 }
232}
233
234static int sh_mtu2_register(struct sh_mtu2_priv *p, char *name,
235 unsigned long clockevent_rating)
236{
237 if (clockevent_rating)
238 sh_mtu2_register_clockevent(p, name, clockevent_rating);
239
240 return 0;
241}
242
243static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev)
244{
245 struct sh_timer_config *cfg = pdev->dev.platform_data;
246 struct resource *res;
247 int irq, ret;
248 ret = -ENXIO;
249
250 memset(p, 0, sizeof(*p));
251 p->pdev = pdev;
252
253 if (!cfg) {
254 dev_err(&p->pdev->dev, "missing platform data\n");
255 goto err0;
256 }
257
258 platform_set_drvdata(pdev, p);
259
260 res = platform_get_resource(p->pdev, IORESOURCE_MEM, 0);
261 if (!res) {
262 dev_err(&p->pdev->dev, "failed to get I/O memory\n");
263 goto err0;
264 }
265
266 irq = platform_get_irq(p->pdev, 0);
267 if (irq < 0) {
268 dev_err(&p->pdev->dev, "failed to get irq\n");
269 goto err0;
270 }
271
272 /* map memory, let mapbase point to our channel */
273 p->mapbase = ioremap_nocache(res->start, resource_size(res));
274 if (p->mapbase == NULL) {
275 dev_err(&p->pdev->dev, "failed to remap I/O memory\n");
276 goto err0;
277 }
278
279 /* setup data for setup_irq() (too early for request_irq()) */
280 p->irqaction.name = dev_name(&p->pdev->dev);
281 p->irqaction.handler = sh_mtu2_interrupt;
282 p->irqaction.dev_id = p;
283 p->irqaction.irq = irq;
284 p->irqaction.flags = IRQF_DISABLED | IRQF_TIMER | \
285 IRQF_IRQPOLL | IRQF_NOBALANCING;
286
287 /* get hold of clock */
288 p->clk = clk_get(&p->pdev->dev, "mtu2_fck");
289 if (IS_ERR(p->clk)) {
290 dev_err(&p->pdev->dev, "cannot get clock\n");
291 ret = PTR_ERR(p->clk);
292 goto err1;
293 }
294
295 return sh_mtu2_register(p, (char *)dev_name(&p->pdev->dev),
296 cfg->clockevent_rating);
297 err1:
298 iounmap(p->mapbase);
299 err0:
300 return ret;
301}
302
303static int __devinit sh_mtu2_probe(struct platform_device *pdev)
304{
305 struct sh_mtu2_priv *p = platform_get_drvdata(pdev);
306 int ret;
307
308 if (p) {
309 dev_info(&pdev->dev, "kept as earlytimer\n");
310 return 0;
311 }
312
313 p = kmalloc(sizeof(*p), GFP_KERNEL);
314 if (p == NULL) {
315 dev_err(&pdev->dev, "failed to allocate driver data\n");
316 return -ENOMEM;
317 }
318
319 ret = sh_mtu2_setup(p, pdev);
320 if (ret) {
321 kfree(p);
322 platform_set_drvdata(pdev, NULL);
323 }
324 return ret;
325}
326
327static int __devexit sh_mtu2_remove(struct platform_device *pdev)
328{
329 return -EBUSY; /* cannot unregister clockevent */
330}
331
332static struct platform_driver sh_mtu2_device_driver = {
333 .probe = sh_mtu2_probe,
334 .remove = __devexit_p(sh_mtu2_remove),
335 .driver = {
336 .name = "sh_mtu2",
337 }
338};
339
340static int __init sh_mtu2_init(void)
341{
342 return platform_driver_register(&sh_mtu2_device_driver);
343}
344
345static void __exit sh_mtu2_exit(void)
346{
347 platform_driver_unregister(&sh_mtu2_device_driver);
348}
349
350early_platform_init("earlytimer", &sh_mtu2_device_driver);
351module_init(sh_mtu2_init);
352module_exit(sh_mtu2_exit);
353
354MODULE_AUTHOR("Magnus Damm");
355MODULE_DESCRIPTION("SuperH MTU2 Timer Driver");
356MODULE_LICENSE("GPL v2");
1/*
2 * SuperH Timer Support - MTU2
3 *
4 * Copyright (C) 2009 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.
14 */
15
16#include <linux/clk.h>
17#include <linux/clockchips.h>
18#include <linux/delay.h>
19#include <linux/err.h>
20#include <linux/init.h>
21#include <linux/interrupt.h>
22#include <linux/io.h>
23#include <linux/ioport.h>
24#include <linux/irq.h>
25#include <linux/module.h>
26#include <linux/of.h>
27#include <linux/platform_device.h>
28#include <linux/pm_domain.h>
29#include <linux/pm_runtime.h>
30#include <linux/sh_timer.h>
31#include <linux/slab.h>
32#include <linux/spinlock.h>
33
34struct sh_mtu2_device;
35
36struct sh_mtu2_channel {
37 struct sh_mtu2_device *mtu;
38 unsigned int index;
39
40 void __iomem *base;
41
42 struct clock_event_device ced;
43};
44
45struct sh_mtu2_device {
46 struct platform_device *pdev;
47
48 void __iomem *mapbase;
49 struct clk *clk;
50
51 raw_spinlock_t lock; /* Protect the shared registers */
52
53 struct sh_mtu2_channel *channels;
54 unsigned int num_channels;
55
56 bool has_clockevent;
57};
58
59#define TSTR -1 /* shared register */
60#define TCR 0 /* channel register */
61#define TMDR 1 /* channel register */
62#define TIOR 2 /* channel register */
63#define TIER 3 /* channel register */
64#define TSR 4 /* channel register */
65#define TCNT 5 /* channel register */
66#define TGR 6 /* channel register */
67
68#define TCR_CCLR_NONE (0 << 5)
69#define TCR_CCLR_TGRA (1 << 5)
70#define TCR_CCLR_TGRB (2 << 5)
71#define TCR_CCLR_SYNC (3 << 5)
72#define TCR_CCLR_TGRC (5 << 5)
73#define TCR_CCLR_TGRD (6 << 5)
74#define TCR_CCLR_MASK (7 << 5)
75#define TCR_CKEG_RISING (0 << 3)
76#define TCR_CKEG_FALLING (1 << 3)
77#define TCR_CKEG_BOTH (2 << 3)
78#define TCR_CKEG_MASK (3 << 3)
79/* Values 4 to 7 are channel-dependent */
80#define TCR_TPSC_P1 (0 << 0)
81#define TCR_TPSC_P4 (1 << 0)
82#define TCR_TPSC_P16 (2 << 0)
83#define TCR_TPSC_P64 (3 << 0)
84#define TCR_TPSC_CH0_TCLKA (4 << 0)
85#define TCR_TPSC_CH0_TCLKB (5 << 0)
86#define TCR_TPSC_CH0_TCLKC (6 << 0)
87#define TCR_TPSC_CH0_TCLKD (7 << 0)
88#define TCR_TPSC_CH1_TCLKA (4 << 0)
89#define TCR_TPSC_CH1_TCLKB (5 << 0)
90#define TCR_TPSC_CH1_P256 (6 << 0)
91#define TCR_TPSC_CH1_TCNT2 (7 << 0)
92#define TCR_TPSC_CH2_TCLKA (4 << 0)
93#define TCR_TPSC_CH2_TCLKB (5 << 0)
94#define TCR_TPSC_CH2_TCLKC (6 << 0)
95#define TCR_TPSC_CH2_P1024 (7 << 0)
96#define TCR_TPSC_CH34_P256 (4 << 0)
97#define TCR_TPSC_CH34_P1024 (5 << 0)
98#define TCR_TPSC_CH34_TCLKA (6 << 0)
99#define TCR_TPSC_CH34_TCLKB (7 << 0)
100#define TCR_TPSC_MASK (7 << 0)
101
102#define TMDR_BFE (1 << 6)
103#define TMDR_BFB (1 << 5)
104#define TMDR_BFA (1 << 4)
105#define TMDR_MD_NORMAL (0 << 0)
106#define TMDR_MD_PWM_1 (2 << 0)
107#define TMDR_MD_PWM_2 (3 << 0)
108#define TMDR_MD_PHASE_1 (4 << 0)
109#define TMDR_MD_PHASE_2 (5 << 0)
110#define TMDR_MD_PHASE_3 (6 << 0)
111#define TMDR_MD_PHASE_4 (7 << 0)
112#define TMDR_MD_PWM_SYNC (8 << 0)
113#define TMDR_MD_PWM_COMP_CREST (13 << 0)
114#define TMDR_MD_PWM_COMP_TROUGH (14 << 0)
115#define TMDR_MD_PWM_COMP_BOTH (15 << 0)
116#define TMDR_MD_MASK (15 << 0)
117
118#define TIOC_IOCH(n) ((n) << 4)
119#define TIOC_IOCL(n) ((n) << 0)
120#define TIOR_OC_RETAIN (0 << 0)
121#define TIOR_OC_0_CLEAR (1 << 0)
122#define TIOR_OC_0_SET (2 << 0)
123#define TIOR_OC_0_TOGGLE (3 << 0)
124#define TIOR_OC_1_CLEAR (5 << 0)
125#define TIOR_OC_1_SET (6 << 0)
126#define TIOR_OC_1_TOGGLE (7 << 0)
127#define TIOR_IC_RISING (8 << 0)
128#define TIOR_IC_FALLING (9 << 0)
129#define TIOR_IC_BOTH (10 << 0)
130#define TIOR_IC_TCNT (12 << 0)
131#define TIOR_MASK (15 << 0)
132
133#define TIER_TTGE (1 << 7)
134#define TIER_TTGE2 (1 << 6)
135#define TIER_TCIEU (1 << 5)
136#define TIER_TCIEV (1 << 4)
137#define TIER_TGIED (1 << 3)
138#define TIER_TGIEC (1 << 2)
139#define TIER_TGIEB (1 << 1)
140#define TIER_TGIEA (1 << 0)
141
142#define TSR_TCFD (1 << 7)
143#define TSR_TCFU (1 << 5)
144#define TSR_TCFV (1 << 4)
145#define TSR_TGFD (1 << 3)
146#define TSR_TGFC (1 << 2)
147#define TSR_TGFB (1 << 1)
148#define TSR_TGFA (1 << 0)
149
150static unsigned long mtu2_reg_offs[] = {
151 [TCR] = 0,
152 [TMDR] = 1,
153 [TIOR] = 2,
154 [TIER] = 4,
155 [TSR] = 5,
156 [TCNT] = 6,
157 [TGR] = 8,
158};
159
160static inline unsigned long sh_mtu2_read(struct sh_mtu2_channel *ch, int reg_nr)
161{
162 unsigned long offs;
163
164 if (reg_nr == TSTR)
165 return ioread8(ch->mtu->mapbase + 0x280);
166
167 offs = mtu2_reg_offs[reg_nr];
168
169 if ((reg_nr == TCNT) || (reg_nr == TGR))
170 return ioread16(ch->base + offs);
171 else
172 return ioread8(ch->base + offs);
173}
174
175static inline void sh_mtu2_write(struct sh_mtu2_channel *ch, int reg_nr,
176 unsigned long value)
177{
178 unsigned long offs;
179
180 if (reg_nr == TSTR)
181 return iowrite8(value, ch->mtu->mapbase + 0x280);
182
183 offs = mtu2_reg_offs[reg_nr];
184
185 if ((reg_nr == TCNT) || (reg_nr == TGR))
186 iowrite16(value, ch->base + offs);
187 else
188 iowrite8(value, ch->base + offs);
189}
190
191static void sh_mtu2_start_stop_ch(struct sh_mtu2_channel *ch, int start)
192{
193 unsigned long flags, value;
194
195 /* start stop register shared by multiple timer channels */
196 raw_spin_lock_irqsave(&ch->mtu->lock, flags);
197 value = sh_mtu2_read(ch, TSTR);
198
199 if (start)
200 value |= 1 << ch->index;
201 else
202 value &= ~(1 << ch->index);
203
204 sh_mtu2_write(ch, TSTR, value);
205 raw_spin_unlock_irqrestore(&ch->mtu->lock, flags);
206}
207
208static int sh_mtu2_enable(struct sh_mtu2_channel *ch)
209{
210 unsigned long periodic;
211 unsigned long rate;
212 int ret;
213
214 pm_runtime_get_sync(&ch->mtu->pdev->dev);
215 dev_pm_syscore_device(&ch->mtu->pdev->dev, true);
216
217 /* enable clock */
218 ret = clk_enable(ch->mtu->clk);
219 if (ret) {
220 dev_err(&ch->mtu->pdev->dev, "ch%u: cannot enable clock\n",
221 ch->index);
222 return ret;
223 }
224
225 /* make sure channel is disabled */
226 sh_mtu2_start_stop_ch(ch, 0);
227
228 rate = clk_get_rate(ch->mtu->clk) / 64;
229 periodic = (rate + HZ/2) / HZ;
230
231 /*
232 * "Periodic Counter Operation"
233 * Clear on TGRA compare match, divide clock by 64.
234 */
235 sh_mtu2_write(ch, TCR, TCR_CCLR_TGRA | TCR_TPSC_P64);
236 sh_mtu2_write(ch, TIOR, TIOC_IOCH(TIOR_OC_0_CLEAR) |
237 TIOC_IOCL(TIOR_OC_0_CLEAR));
238 sh_mtu2_write(ch, TGR, periodic);
239 sh_mtu2_write(ch, TCNT, 0);
240 sh_mtu2_write(ch, TMDR, TMDR_MD_NORMAL);
241 sh_mtu2_write(ch, TIER, TIER_TGIEA);
242
243 /* enable channel */
244 sh_mtu2_start_stop_ch(ch, 1);
245
246 return 0;
247}
248
249static void sh_mtu2_disable(struct sh_mtu2_channel *ch)
250{
251 /* disable channel */
252 sh_mtu2_start_stop_ch(ch, 0);
253
254 /* stop clock */
255 clk_disable(ch->mtu->clk);
256
257 dev_pm_syscore_device(&ch->mtu->pdev->dev, false);
258 pm_runtime_put(&ch->mtu->pdev->dev);
259}
260
261static irqreturn_t sh_mtu2_interrupt(int irq, void *dev_id)
262{
263 struct sh_mtu2_channel *ch = dev_id;
264
265 /* acknowledge interrupt */
266 sh_mtu2_read(ch, TSR);
267 sh_mtu2_write(ch, TSR, ~TSR_TGFA);
268
269 /* notify clockevent layer */
270 ch->ced.event_handler(&ch->ced);
271 return IRQ_HANDLED;
272}
273
274static struct sh_mtu2_channel *ced_to_sh_mtu2(struct clock_event_device *ced)
275{
276 return container_of(ced, struct sh_mtu2_channel, ced);
277}
278
279static int sh_mtu2_clock_event_shutdown(struct clock_event_device *ced)
280{
281 struct sh_mtu2_channel *ch = ced_to_sh_mtu2(ced);
282
283 if (clockevent_state_periodic(ced))
284 sh_mtu2_disable(ch);
285
286 return 0;
287}
288
289static int sh_mtu2_clock_event_set_periodic(struct clock_event_device *ced)
290{
291 struct sh_mtu2_channel *ch = ced_to_sh_mtu2(ced);
292
293 if (clockevent_state_periodic(ced))
294 sh_mtu2_disable(ch);
295
296 dev_info(&ch->mtu->pdev->dev, "ch%u: used for periodic clock events\n",
297 ch->index);
298 sh_mtu2_enable(ch);
299 return 0;
300}
301
302static void sh_mtu2_clock_event_suspend(struct clock_event_device *ced)
303{
304 pm_genpd_syscore_poweroff(&ced_to_sh_mtu2(ced)->mtu->pdev->dev);
305}
306
307static void sh_mtu2_clock_event_resume(struct clock_event_device *ced)
308{
309 pm_genpd_syscore_poweron(&ced_to_sh_mtu2(ced)->mtu->pdev->dev);
310}
311
312static void sh_mtu2_register_clockevent(struct sh_mtu2_channel *ch,
313 const char *name)
314{
315 struct clock_event_device *ced = &ch->ced;
316
317 ced->name = name;
318 ced->features = CLOCK_EVT_FEAT_PERIODIC;
319 ced->rating = 200;
320 ced->cpumask = cpu_possible_mask;
321 ced->set_state_shutdown = sh_mtu2_clock_event_shutdown;
322 ced->set_state_periodic = sh_mtu2_clock_event_set_periodic;
323 ced->suspend = sh_mtu2_clock_event_suspend;
324 ced->resume = sh_mtu2_clock_event_resume;
325
326 dev_info(&ch->mtu->pdev->dev, "ch%u: used for clock events\n",
327 ch->index);
328 clockevents_register_device(ced);
329}
330
331static int sh_mtu2_register(struct sh_mtu2_channel *ch, const char *name)
332{
333 ch->mtu->has_clockevent = true;
334 sh_mtu2_register_clockevent(ch, name);
335
336 return 0;
337}
338
339static int sh_mtu2_setup_channel(struct sh_mtu2_channel *ch, unsigned int index,
340 struct sh_mtu2_device *mtu)
341{
342 static const unsigned int channel_offsets[] = {
343 0x300, 0x380, 0x000,
344 };
345 char name[6];
346 int irq;
347 int ret;
348
349 ch->mtu = mtu;
350
351 sprintf(name, "tgi%ua", index);
352 irq = platform_get_irq_byname(mtu->pdev, name);
353 if (irq < 0) {
354 /* Skip channels with no declared interrupt. */
355 return 0;
356 }
357
358 ret = request_irq(irq, sh_mtu2_interrupt,
359 IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING,
360 dev_name(&ch->mtu->pdev->dev), ch);
361 if (ret) {
362 dev_err(&ch->mtu->pdev->dev, "ch%u: failed to request irq %d\n",
363 index, irq);
364 return ret;
365 }
366
367 ch->base = mtu->mapbase + channel_offsets[index];
368 ch->index = index;
369
370 return sh_mtu2_register(ch, dev_name(&mtu->pdev->dev));
371}
372
373static int sh_mtu2_map_memory(struct sh_mtu2_device *mtu)
374{
375 struct resource *res;
376
377 res = platform_get_resource(mtu->pdev, IORESOURCE_MEM, 0);
378 if (!res) {
379 dev_err(&mtu->pdev->dev, "failed to get I/O memory\n");
380 return -ENXIO;
381 }
382
383 mtu->mapbase = ioremap_nocache(res->start, resource_size(res));
384 if (mtu->mapbase == NULL)
385 return -ENXIO;
386
387 return 0;
388}
389
390static int sh_mtu2_setup(struct sh_mtu2_device *mtu,
391 struct platform_device *pdev)
392{
393 unsigned int i;
394 int ret;
395
396 mtu->pdev = pdev;
397
398 raw_spin_lock_init(&mtu->lock);
399
400 /* Get hold of clock. */
401 mtu->clk = clk_get(&mtu->pdev->dev, "fck");
402 if (IS_ERR(mtu->clk)) {
403 dev_err(&mtu->pdev->dev, "cannot get clock\n");
404 return PTR_ERR(mtu->clk);
405 }
406
407 ret = clk_prepare(mtu->clk);
408 if (ret < 0)
409 goto err_clk_put;
410
411 /* Map the memory resource. */
412 ret = sh_mtu2_map_memory(mtu);
413 if (ret < 0) {
414 dev_err(&mtu->pdev->dev, "failed to remap I/O memory\n");
415 goto err_clk_unprepare;
416 }
417
418 /* Allocate and setup the channels. */
419 mtu->num_channels = 3;
420
421 mtu->channels = kzalloc(sizeof(*mtu->channels) * mtu->num_channels,
422 GFP_KERNEL);
423 if (mtu->channels == NULL) {
424 ret = -ENOMEM;
425 goto err_unmap;
426 }
427
428 for (i = 0; i < mtu->num_channels; ++i) {
429 ret = sh_mtu2_setup_channel(&mtu->channels[i], i, mtu);
430 if (ret < 0)
431 goto err_unmap;
432 }
433
434 platform_set_drvdata(pdev, mtu);
435
436 return 0;
437
438err_unmap:
439 kfree(mtu->channels);
440 iounmap(mtu->mapbase);
441err_clk_unprepare:
442 clk_unprepare(mtu->clk);
443err_clk_put:
444 clk_put(mtu->clk);
445 return ret;
446}
447
448static int sh_mtu2_probe(struct platform_device *pdev)
449{
450 struct sh_mtu2_device *mtu = platform_get_drvdata(pdev);
451 int ret;
452
453 if (!is_early_platform_device(pdev)) {
454 pm_runtime_set_active(&pdev->dev);
455 pm_runtime_enable(&pdev->dev);
456 }
457
458 if (mtu) {
459 dev_info(&pdev->dev, "kept as earlytimer\n");
460 goto out;
461 }
462
463 mtu = kzalloc(sizeof(*mtu), GFP_KERNEL);
464 if (mtu == NULL)
465 return -ENOMEM;
466
467 ret = sh_mtu2_setup(mtu, pdev);
468 if (ret) {
469 kfree(mtu);
470 pm_runtime_idle(&pdev->dev);
471 return ret;
472 }
473 if (is_early_platform_device(pdev))
474 return 0;
475
476 out:
477 if (mtu->has_clockevent)
478 pm_runtime_irq_safe(&pdev->dev);
479 else
480 pm_runtime_idle(&pdev->dev);
481
482 return 0;
483}
484
485static int sh_mtu2_remove(struct platform_device *pdev)
486{
487 return -EBUSY; /* cannot unregister clockevent */
488}
489
490static const struct platform_device_id sh_mtu2_id_table[] = {
491 { "sh-mtu2", 0 },
492 { },
493};
494MODULE_DEVICE_TABLE(platform, sh_mtu2_id_table);
495
496static const struct of_device_id sh_mtu2_of_table[] __maybe_unused = {
497 { .compatible = "renesas,mtu2" },
498 { }
499};
500MODULE_DEVICE_TABLE(of, sh_mtu2_of_table);
501
502static struct platform_driver sh_mtu2_device_driver = {
503 .probe = sh_mtu2_probe,
504 .remove = sh_mtu2_remove,
505 .driver = {
506 .name = "sh_mtu2",
507 .of_match_table = of_match_ptr(sh_mtu2_of_table),
508 },
509 .id_table = sh_mtu2_id_table,
510};
511
512static int __init sh_mtu2_init(void)
513{
514 return platform_driver_register(&sh_mtu2_device_driver);
515}
516
517static void __exit sh_mtu2_exit(void)
518{
519 platform_driver_unregister(&sh_mtu2_device_driver);
520}
521
522early_platform_init("earlytimer", &sh_mtu2_device_driver);
523subsys_initcall(sh_mtu2_init);
524module_exit(sh_mtu2_exit);
525
526MODULE_AUTHOR("Magnus Damm");
527MODULE_DESCRIPTION("SuperH MTU2 Timer Driver");
528MODULE_LICENSE("GPL v2");