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16#include <linux/kernel.h>
17#include <linux/err.h>
18#include <linux/errno.h>
19#include <linux/list.h>
20#include <linux/io.h>
21#include <linux/of.h>
22#include <linux/spinlock.h>
23#include <linux/bitops.h>
24#include <linux/slab.h>
25#include <linux/export.h>
26#include <asm/fsl_gtm.h>
27
28#define GTCFR_STP(x) ((x) & 1 ? 1 << 5 : 1 << 1)
29#define GTCFR_RST(x) ((x) & 1 ? 1 << 4 : 1 << 0)
30
31#define GTMDR_ICLK_MASK (3 << 1)
32#define GTMDR_ICLK_ICAS (0 << 1)
33#define GTMDR_ICLK_ICLK (1 << 1)
34#define GTMDR_ICLK_SLGO (2 << 1)
35#define GTMDR_FRR (1 << 3)
36#define GTMDR_ORI (1 << 4)
37#define GTMDR_SPS(x) ((x) << 8)
38
39struct gtm_timers_regs {
40 u8 gtcfr1;
41 u8 res0[0x3];
42 u8 gtcfr2;
43 u8 res1[0xB];
44 __be16 gtmdr1;
45 __be16 gtmdr2;
46 __be16 gtrfr1;
47 __be16 gtrfr2;
48 __be16 gtcpr1;
49 __be16 gtcpr2;
50 __be16 gtcnr1;
51 __be16 gtcnr2;
52 __be16 gtmdr3;
53 __be16 gtmdr4;
54 __be16 gtrfr3;
55 __be16 gtrfr4;
56 __be16 gtcpr3;
57 __be16 gtcpr4;
58 __be16 gtcnr3;
59 __be16 gtcnr4;
60 __be16 gtevr1;
61 __be16 gtevr2;
62 __be16 gtevr3;
63 __be16 gtevr4;
64 __be16 gtpsr1;
65 __be16 gtpsr2;
66 __be16 gtpsr3;
67 __be16 gtpsr4;
68 u8 res2[0x40];
69} __attribute__ ((packed));
70
71struct gtm {
72 unsigned int clock;
73 struct gtm_timers_regs __iomem *regs;
74 struct gtm_timer timers[4];
75 spinlock_t lock;
76 struct list_head list_node;
77};
78
79static LIST_HEAD(gtms);
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88
89struct gtm_timer *gtm_get_timer16(void)
90{
91 struct gtm *gtm = NULL;
92 int i;
93
94 list_for_each_entry(gtm, >ms, list_node) {
95 spin_lock_irq(>m->lock);
96
97 for (i = 0; i < ARRAY_SIZE(gtm->timers); i++) {
98 if (!gtm->timers[i].requested) {
99 gtm->timers[i].requested = true;
100 spin_unlock_irq(>m->lock);
101 return >m->timers[i];
102 }
103 }
104
105 spin_unlock_irq(>m->lock);
106 }
107
108 if (gtm)
109 return ERR_PTR(-EBUSY);
110 return ERR_PTR(-ENODEV);
111}
112EXPORT_SYMBOL(gtm_get_timer16);
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123
124struct gtm_timer *gtm_get_specific_timer16(struct gtm *gtm,
125 unsigned int timer)
126{
127 struct gtm_timer *ret = ERR_PTR(-EBUSY);
128
129 if (timer > 3)
130 return ERR_PTR(-EINVAL);
131
132 spin_lock_irq(>m->lock);
133
134 if (gtm->timers[timer].requested)
135 goto out;
136
137 ret = >m->timers[timer];
138 ret->requested = true;
139
140out:
141 spin_unlock_irq(>m->lock);
142 return ret;
143}
144EXPORT_SYMBOL(gtm_get_specific_timer16);
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152
153void gtm_put_timer16(struct gtm_timer *tmr)
154{
155 gtm_stop_timer16(tmr);
156
157 spin_lock_irq(&tmr->gtm->lock);
158 tmr->requested = false;
159 spin_unlock_irq(&tmr->gtm->lock);
160}
161EXPORT_SYMBOL(gtm_put_timer16);
162
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166
167static int gtm_set_ref_timer16(struct gtm_timer *tmr, int frequency,
168 int reference_value, bool free_run)
169{
170 struct gtm *gtm = tmr->gtm;
171 int num = tmr - >m->timers[0];
172 unsigned int prescaler;
173 u8 iclk = GTMDR_ICLK_ICLK;
174 u8 psr;
175 u8 sps;
176 unsigned long flags;
177 int max_prescaler = 256 * 256 * 16;
178
179
180 if (!tmr->gtpsr)
181 max_prescaler /= 256;
182
183 prescaler = gtm->clock / frequency;
184
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187
188
189 if (prescaler > max_prescaler)
190 return -EINVAL;
191
192 if (prescaler > max_prescaler / 16) {
193 iclk = GTMDR_ICLK_SLGO;
194 prescaler /= 16;
195 }
196
197 if (prescaler <= 256) {
198 psr = 0;
199 sps = prescaler - 1;
200 } else {
201 psr = 256 - 1;
202 sps = prescaler / 256 - 1;
203 }
204
205 spin_lock_irqsave(>m->lock, flags);
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210
211 clrsetbits_8(tmr->gtcfr, ~(GTCFR_STP(num) | GTCFR_RST(num)),
212 GTCFR_STP(num) | GTCFR_RST(num));
213
214 setbits8(tmr->gtcfr, GTCFR_STP(num));
215
216 if (tmr->gtpsr)
217 out_be16(tmr->gtpsr, psr);
218 clrsetbits_be16(tmr->gtmdr, 0xFFFF, iclk | GTMDR_SPS(sps) |
219 GTMDR_ORI | (free_run ? GTMDR_FRR : 0));
220 out_be16(tmr->gtcnr, 0);
221 out_be16(tmr->gtrfr, reference_value);
222 out_be16(tmr->gtevr, 0xFFFF);
223
224
225 clrbits8(tmr->gtcfr, GTCFR_STP(num));
226
227 spin_unlock_irqrestore(>m->lock, flags);
228
229 return 0;
230}
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244
245int gtm_set_timer16(struct gtm_timer *tmr, unsigned long usec, bool reload)
246{
247
248 int freq = 1000000;
249 unsigned int bit;
250
251 bit = fls_long(usec);
252 if (bit > 15) {
253 freq >>= bit - 15;
254 usec >>= bit - 15;
255 }
256
257 if (!freq)
258 return -EINVAL;
259
260 return gtm_set_ref_timer16(tmr, freq, usec, reload);
261}
262EXPORT_SYMBOL(gtm_set_timer16);
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281int gtm_set_exact_timer16(struct gtm_timer *tmr, u16 usec, bool reload)
282{
283
284 const int freq = 1000000;
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293 return gtm_set_ref_timer16(tmr, freq, usec, reload);
294}
295EXPORT_SYMBOL(gtm_set_exact_timer16);
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303
304void gtm_stop_timer16(struct gtm_timer *tmr)
305{
306 struct gtm *gtm = tmr->gtm;
307 int num = tmr - >m->timers[0];
308 unsigned long flags;
309
310 spin_lock_irqsave(>m->lock, flags);
311
312 setbits8(tmr->gtcfr, GTCFR_STP(num));
313 out_be16(tmr->gtevr, 0xFFFF);
314
315 spin_unlock_irqrestore(>m->lock, flags);
316}
317EXPORT_SYMBOL(gtm_stop_timer16);
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327
328void gtm_ack_timer16(struct gtm_timer *tmr, u16 events)
329{
330 out_be16(tmr->gtevr, events);
331}
332EXPORT_SYMBOL(gtm_ack_timer16);
333
334static void __init gtm_set_shortcuts(struct device_node *np,
335 struct gtm_timer *timers,
336 struct gtm_timers_regs __iomem *regs)
337{
338
339
340
341
342
343
344 timers[0].gtcfr = ®s->gtcfr1;
345 timers[0].gtmdr = ®s->gtmdr1;
346 timers[0].gtcnr = ®s->gtcnr1;
347 timers[0].gtrfr = ®s->gtrfr1;
348 timers[0].gtevr = ®s->gtevr1;
349
350 timers[1].gtcfr = ®s->gtcfr1;
351 timers[1].gtmdr = ®s->gtmdr2;
352 timers[1].gtcnr = ®s->gtcnr2;
353 timers[1].gtrfr = ®s->gtrfr2;
354 timers[1].gtevr = ®s->gtevr2;
355
356 timers[2].gtcfr = ®s->gtcfr2;
357 timers[2].gtmdr = ®s->gtmdr3;
358 timers[2].gtcnr = ®s->gtcnr3;
359 timers[2].gtrfr = ®s->gtrfr3;
360 timers[2].gtevr = ®s->gtevr3;
361
362 timers[3].gtcfr = ®s->gtcfr2;
363 timers[3].gtmdr = ®s->gtmdr4;
364 timers[3].gtcnr = ®s->gtcnr4;
365 timers[3].gtrfr = ®s->gtrfr4;
366 timers[3].gtevr = ®s->gtevr4;
367
368
369 if (!of_device_is_compatible(np, "fsl,cpm2-gtm")) {
370 timers[0].gtpsr = ®s->gtpsr1;
371 timers[1].gtpsr = ®s->gtpsr2;
372 timers[2].gtpsr = ®s->gtpsr3;
373 timers[3].gtpsr = ®s->gtpsr4;
374 }
375}
376
377static int __init fsl_gtm_init(void)
378{
379 struct device_node *np;
380
381 for_each_compatible_node(np, NULL, "fsl,gtm") {
382 int i;
383 struct gtm *gtm;
384 const u32 *clock;
385 int size;
386
387 gtm = kzalloc(sizeof(*gtm), GFP_KERNEL);
388 if (!gtm) {
389 pr_err("%s: unable to allocate memory\n",
390 np->full_name);
391 continue;
392 }
393
394 spin_lock_init(>m->lock);
395
396 clock = of_get_property(np, "clock-frequency", &size);
397 if (!clock || size != sizeof(*clock)) {
398 pr_err("%s: no clock-frequency\n", np->full_name);
399 goto err;
400 }
401 gtm->clock = *clock;
402
403 for (i = 0; i < ARRAY_SIZE(gtm->timers); i++) {
404 int ret;
405 struct resource irq;
406
407 ret = of_irq_to_resource(np, i, &irq);
408 if (ret == NO_IRQ) {
409 pr_err("%s: not enough interrupts specified\n",
410 np->full_name);
411 goto err;
412 }
413 gtm->timers[i].irq = irq.start;
414 gtm->timers[i].gtm = gtm;
415 }
416
417 gtm->regs = of_iomap(np, 0);
418 if (!gtm->regs) {
419 pr_err("%s: unable to iomap registers\n",
420 np->full_name);
421 goto err;
422 }
423
424 gtm_set_shortcuts(np, gtm->timers, gtm->regs);
425 list_add(>m->list_node, >ms);
426
427
428 np->data = gtm;
429 of_node_get(np);
430
431 continue;
432err:
433 kfree(gtm);
434 }
435 return 0;
436}
437arch_initcall(fsl_gtm_init);
438