Root/target/linux/ifxmips/files/arch/mips/ifxmips/timer.c

1#include <linux/kernel.h>
2#include <linux/module.h>
3#include <linux/version.h>
4#include <linux/types.h>
5#include <linux/fs.h>
6#include <linux/miscdevice.h>
7#include <linux/init.h>
8#include <linux/uaccess.h>
9#include <linux/unistd.h>
10#include <linux/errno.h>
11#include <linux/interrupt.h>
12
13#include <asm/irq.h>
14#include <asm/div64.h>
15
16#include <ifxmips.h>
17#include <ifxmips_irq.h>
18#include <ifxmips_cgu.h>
19#include <ifxmips_gptu.h>
20#include <ifxmips_pmu.h>
21
22#define MAX_NUM_OF_32BIT_TIMER_BLOCKS 6
23
24#ifdef TIMER1A
25#define FIRST_TIMER TIMER1A
26#else
27#define FIRST_TIMER 2
28#endif
29
30/*
31 * GPTC divider is set or not.
32 */
33#define GPTU_CLC_RMC_IS_SET 0
34
35/*
36 * Timer Interrupt (IRQ)
37 */
38/* Must be adjusted when ICU driver is available */
39#define TIMER_INTERRUPT (INT_NUM_IM3_IRL0 + 22)
40
41/*
42 * Bits Operation
43 */
44#define GET_BITS(x, msb, lsb) \
45    (((x) & ((1 << ((msb) + 1)) - 1)) >> (lsb))
46#define SET_BITS(x, msb, lsb, value) \
47    (((x) & ~(((1 << ((msb) + 1)) - 1) ^ ((1 << (lsb)) - 1))) | \
48    (((value) & ((1 << (1 + (msb) - (lsb))) - 1)) << (lsb)))
49
50/*
51 * GPTU Register Mapping
52 */
53#define IFXMIPS_GPTU (KSEG1 + 0x1E100A00)
54#define IFXMIPS_GPTU_CLC ((volatile u32 *)(IFXMIPS_GPTU + 0x0000))
55#define IFXMIPS_GPTU_ID ((volatile u32 *)(IFXMIPS_GPTU + 0x0008))
56#define IFXMIPS_GPTU_CON(n, X) ((volatile u32 *)(IFXMIPS_GPTU + 0x0010 + ((X) * 4) + ((n) - 1) * 0x0020)) /* X must be either A or B */
57#define IFXMIPS_GPTU_RUN(n, X) ((volatile u32 *)(IFXMIPS_GPTU + 0x0018 + ((X) * 4) + ((n) - 1) * 0x0020)) /* X must be either A or B */
58#define IFXMIPS_GPTU_RELOAD(n, X) ((volatile u32 *)(IFXMIPS_GPTU + 0x0020 + ((X) * 4) + ((n) - 1) * 0x0020)) /* X must be either A or B */
59#define IFXMIPS_GPTU_COUNT(n, X) ((volatile u32 *)(IFXMIPS_GPTU + 0x0028 + ((X) * 4) + ((n) - 1) * 0x0020)) /* X must be either A or B */
60#define IFXMIPS_GPTU_IRNEN ((volatile u32 *)(IFXMIPS_GPTU + 0x00F4))
61#define IFXMIPS_GPTU_IRNICR ((volatile u32 *)(IFXMIPS_GPTU + 0x00F8))
62#define IFXMIPS_GPTU_IRNCR ((volatile u32 *)(IFXMIPS_GPTU + 0x00FC))
63
64/*
65 * Clock Control Register
66 */
67#define GPTU_CLC_SMC GET_BITS(*IFXMIPS_GPTU_CLC, 23, 16)
68#define GPTU_CLC_RMC GET_BITS(*IFXMIPS_GPTU_CLC, 15, 8)
69#define GPTU_CLC_FSOE (*IFXMIPS_GPTU_CLC & (1 << 5))
70#define GPTU_CLC_EDIS (*IFXMIPS_GPTU_CLC & (1 << 3))
71#define GPTU_CLC_SPEN (*IFXMIPS_GPTU_CLC & (1 << 2))
72#define GPTU_CLC_DISS (*IFXMIPS_GPTU_CLC & (1 << 1))
73#define GPTU_CLC_DISR (*IFXMIPS_GPTU_CLC & (1 << 0))
74
75#define GPTU_CLC_SMC_SET(value) SET_BITS(0, 23, 16, (value))
76#define GPTU_CLC_RMC_SET(value) SET_BITS(0, 15, 8, (value))
77#define GPTU_CLC_FSOE_SET(value) ((value) ? (1 << 5) : 0)
78#define GPTU_CLC_SBWE_SET(value) ((value) ? (1 << 4) : 0)
79#define GPTU_CLC_EDIS_SET(value) ((value) ? (1 << 3) : 0)
80#define GPTU_CLC_SPEN_SET(value) ((value) ? (1 << 2) : 0)
81#define GPTU_CLC_DISR_SET(value) ((value) ? (1 << 0) : 0)
82
83/*
84 * ID Register
85 */
86#define GPTU_ID_ID GET_BITS(*IFXMIPS_GPTU_ID, 15, 8)
87#define GPTU_ID_CFG GET_BITS(*IFXMIPS_GPTU_ID, 7, 5)
88#define GPTU_ID_REV GET_BITS(*IFXMIPS_GPTU_ID, 4, 0)
89
90/*
91 * Control Register of Timer/Counter nX
92 * n is the index of block (1 based index)
93 * X is either A or B
94 */
95#define GPTU_CON_SRC_EG(n, X) (*IFXMIPS_GPTU_CON(n, X) & (1 << 10))
96#define GPTU_CON_SRC_EXT(n, X) (*IFXMIPS_GPTU_CON(n, X) & (1 << 9))
97#define GPTU_CON_SYNC(n, X) (*IFXMIPS_GPTU_CON(n, X) & (1 << 8))
98#define GPTU_CON_EDGE(n, X) GET_BITS(*IFXMIPS_GPTU_CON(n, X), 7, 6)
99#define GPTU_CON_INV(n, X) (*IFXMIPS_GPTU_CON(n, X) & (1 << 5))
100#define GPTU_CON_EXT(n, X) (*IFXMIPS_GPTU_CON(n, A) & (1 << 4)) /* Timer/Counter B does not have this bit */
101#define GPTU_CON_STP(n, X) (*IFXMIPS_GPTU_CON(n, X) & (1 << 3))
102#define GPTU_CON_CNT(n, X) (*IFXMIPS_GPTU_CON(n, X) & (1 << 2))
103#define GPTU_CON_DIR(n, X) (*IFXMIPS_GPTU_CON(n, X) & (1 << 1))
104#define GPTU_CON_EN(n, X) (*IFXMIPS_GPTU_CON(n, X) & (1 << 0))
105
106#define GPTU_CON_SRC_EG_SET(value) ((value) ? 0 : (1 << 10))
107#define GPTU_CON_SRC_EXT_SET(value) ((value) ? (1 << 9) : 0)
108#define GPTU_CON_SYNC_SET(value) ((value) ? (1 << 8) : 0)
109#define GPTU_CON_EDGE_SET(value) SET_BITS(0, 7, 6, (value))
110#define GPTU_CON_INV_SET(value) ((value) ? (1 << 5) : 0)
111#define GPTU_CON_EXT_SET(value) ((value) ? (1 << 4) : 0)
112#define GPTU_CON_STP_SET(value) ((value) ? (1 << 3) : 0)
113#define GPTU_CON_CNT_SET(value) ((value) ? (1 << 2) : 0)
114#define GPTU_CON_DIR_SET(value) ((value) ? (1 << 1) : 0)
115
116#define GPTU_RUN_RL_SET(value) ((value) ? (1 << 2) : 0)
117#define GPTU_RUN_CEN_SET(value) ((value) ? (1 << 1) : 0)
118#define GPTU_RUN_SEN_SET(value) ((value) ? (1 << 0) : 0)
119
120#define GPTU_IRNEN_TC_SET(n, X, value) ((value) ? (1 << (((n) - 1) * 2 + (X))) : 0)
121#define GPTU_IRNCR_TC_SET(n, X, value) ((value) ? (1 << (((n) - 1) * 2 + (X))) : 0)
122
123#define TIMER_FLAG_MASK_SIZE(x) (x & 0x0001)
124#define TIMER_FLAG_MASK_TYPE(x) (x & 0x0002)
125#define TIMER_FLAG_MASK_STOP(x) (x & 0x0004)
126#define TIMER_FLAG_MASK_DIR(x) (x & 0x0008)
127#define TIMER_FLAG_NONE_EDGE 0x0000
128#define TIMER_FLAG_MASK_EDGE(x) (x & 0x0030)
129#define TIMER_FLAG_REAL 0x0000
130#define TIMER_FLAG_INVERT 0x0040
131#define TIMER_FLAG_MASK_INVERT(x) (x & 0x0040)
132#define TIMER_FLAG_MASK_TRIGGER(x) (x & 0x0070)
133#define TIMER_FLAG_MASK_SYNC(x) (x & 0x0080)
134#define TIMER_FLAG_CALLBACK_IN_HB 0x0200
135#define TIMER_FLAG_MASK_HANDLE(x) (x & 0x0300)
136#define TIMER_FLAG_MASK_SRC(x) (x & 0x1000)
137
138struct timer_dev_timer {
139    unsigned int f_irq_on;
140    unsigned int irq;
141    unsigned int flag;
142    unsigned long arg1;
143    unsigned long arg2;
144};
145
146struct timer_dev {
147    struct mutex gptu_mutex;
148    unsigned int number_of_timers;
149    unsigned int occupation;
150    unsigned int f_gptu_on;
151    struct timer_dev_timer timer[MAX_NUM_OF_32BIT_TIMER_BLOCKS * 2];
152};
153
154static int gptu_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
155static int gptu_open(struct inode *, struct file *);
156static int gptu_release(struct inode *, struct file *);
157
158static struct file_operations gptu_fops = {
159    .owner = THIS_MODULE,
160    .ioctl = gptu_ioctl,
161    .open = gptu_open,
162    .release = gptu_release
163};
164
165static struct miscdevice gptu_miscdev = {
166    .minor = MISC_DYNAMIC_MINOR,
167    .name = "gptu",
168    .fops = &gptu_fops,
169};
170
171static struct timer_dev timer_dev;
172
173static irqreturn_t timer_irq_handler(int irq, void *p)
174{
175    unsigned int timer;
176    unsigned int flag;
177    struct timer_dev_timer *dev_timer = (struct timer_dev_timer *)p;
178
179    timer = irq - TIMER_INTERRUPT;
180    if (timer < timer_dev.number_of_timers
181        && dev_timer == &timer_dev.timer[timer]) {
182        /* Clear interrupt. */
183        ifxmips_w32(1 << timer, IFXMIPS_GPTU_IRNCR);
184
185        /* Call user hanler or signal. */
186        flag = dev_timer->flag;
187        if (!(timer & 0x01)
188            || TIMER_FLAG_MASK_SIZE(flag) == TIMER_FLAG_16BIT) {
189            /* 16-bit timer or timer A of 32-bit timer */
190            switch (TIMER_FLAG_MASK_HANDLE(flag)) {
191            case TIMER_FLAG_CALLBACK_IN_IRQ:
192            case TIMER_FLAG_CALLBACK_IN_HB:
193                if (dev_timer->arg1)
194                    (*(timer_callback)dev_timer->arg1)(dev_timer->arg2);
195                break;
196            case TIMER_FLAG_SIGNAL:
197                send_sig((int)dev_timer->arg2, (struct task_struct *)dev_timer->arg1, 0);
198                break;
199            }
200        }
201    }
202    return IRQ_HANDLED;
203}
204
205static inline void ifxmips_enable_gptu(void)
206{
207    ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_GPT);
208
209    /* Set divider as 1, disable write protection for SPEN, enable module. */
210    *IFXMIPS_GPTU_CLC =
211        GPTU_CLC_SMC_SET(0x00) |
212        GPTU_CLC_RMC_SET(0x01) |
213        GPTU_CLC_FSOE_SET(0) |
214        GPTU_CLC_SBWE_SET(1) |
215        GPTU_CLC_EDIS_SET(0) |
216        GPTU_CLC_SPEN_SET(0) |
217        GPTU_CLC_DISR_SET(0);
218}
219
220static inline void ifxmips_disable_gptu(void)
221{
222    ifxmips_w32(0x00, IFXMIPS_GPTU_IRNEN);
223    ifxmips_w32(0xfff, IFXMIPS_GPTU_IRNCR);
224
225    /* Set divider as 0, enable write protection for SPEN, disable module. */
226    *IFXMIPS_GPTU_CLC =
227        GPTU_CLC_SMC_SET(0x00) |
228        GPTU_CLC_RMC_SET(0x00) |
229        GPTU_CLC_FSOE_SET(0) |
230        GPTU_CLC_SBWE_SET(0) |
231        GPTU_CLC_EDIS_SET(0) |
232        GPTU_CLC_SPEN_SET(0) |
233        GPTU_CLC_DISR_SET(1);
234
235    ifxmips_pmu_disable(IFXMIPS_PMU_PWDCR_GPT);
236}
237
238int ifxmips_request_timer(unsigned int timer, unsigned int flag,
239    unsigned long value, unsigned long arg1, unsigned long arg2)
240{
241    int ret = 0;
242    unsigned int con_reg, irnen_reg;
243    int n, X;
244
245    if (timer >= FIRST_TIMER + timer_dev.number_of_timers)
246        return -EINVAL;
247
248    printk(KERN_INFO "request_timer(%d, 0x%08X, %lu)...",
249        timer, flag, value);
250
251    if (TIMER_FLAG_MASK_SIZE(flag) == TIMER_FLAG_16BIT)
252        value &= 0xFFFF;
253    else
254        timer &= ~0x01;
255
256    mutex_lock(&timer_dev.gptu_mutex);
257
258    /*
259     * Allocate timer.
260     */
261    if (timer < FIRST_TIMER) {
262        unsigned int mask;
263        unsigned int shift;
264        /* This takes care of TIMER1B which is the only choice for Voice TAPI system */
265        unsigned int offset = TIMER2A;
266
267        /*
268         * Pick up a free timer.
269         */
270        if (TIMER_FLAG_MASK_SIZE(flag) == TIMER_FLAG_16BIT) {
271            mask = 1 << offset;
272            shift = 1;
273        } else {
274            mask = 3 << offset;
275            shift = 2;
276        }
277        for (timer = offset;
278             timer < offset + timer_dev.number_of_timers;
279             timer += shift, mask <<= shift)
280            if (!(timer_dev.occupation & mask)) {
281                timer_dev.occupation |= mask;
282                break;
283            }
284        if (timer >= offset + timer_dev.number_of_timers) {
285            printk("failed![%d]\n", __LINE__);
286            mutex_unlock(&timer_dev.gptu_mutex);
287            return -EINVAL;
288        } else
289            ret = timer;
290    } else {
291        register unsigned int mask;
292
293        /*
294         * Check if the requested timer is free.
295         */
296        mask = (TIMER_FLAG_MASK_SIZE(flag) == TIMER_FLAG_16BIT ? 1 : 3) << timer;
297        if ((timer_dev.occupation & mask)) {
298            printk("failed![%d] mask %#x, timer_dev.occupation %#x\n",
299                __LINE__, mask, timer_dev.occupation);
300            mutex_unlock(&timer_dev.gptu_mutex);
301            return -EBUSY;
302        } else {
303            timer_dev.occupation |= mask;
304            ret = 0;
305        }
306    }
307
308    /*
309     * Prepare control register value.
310     */
311    switch (TIMER_FLAG_MASK_EDGE(flag)) {
312    default:
313    case TIMER_FLAG_NONE_EDGE:
314        con_reg = GPTU_CON_EDGE_SET(0x00);
315        break;
316    case TIMER_FLAG_RISE_EDGE:
317        con_reg = GPTU_CON_EDGE_SET(0x01);
318        break;
319    case TIMER_FLAG_FALL_EDGE:
320        con_reg = GPTU_CON_EDGE_SET(0x02);
321        break;
322    case TIMER_FLAG_ANY_EDGE:
323        con_reg = GPTU_CON_EDGE_SET(0x03);
324        break;
325    }
326    if (TIMER_FLAG_MASK_TYPE(flag) == TIMER_FLAG_TIMER)
327        con_reg |=
328            TIMER_FLAG_MASK_SRC(flag) ==
329            TIMER_FLAG_EXT_SRC ? GPTU_CON_SRC_EXT_SET(1) :
330            GPTU_CON_SRC_EXT_SET(0);
331    else
332        con_reg |=
333            TIMER_FLAG_MASK_SRC(flag) ==
334            TIMER_FLAG_EXT_SRC ? GPTU_CON_SRC_EG_SET(1) :
335            GPTU_CON_SRC_EG_SET(0);
336    con_reg |=
337        TIMER_FLAG_MASK_SYNC(flag) ==
338        TIMER_FLAG_UNSYNC ? GPTU_CON_SYNC_SET(0) :
339        GPTU_CON_SYNC_SET(1);
340    con_reg |=
341        TIMER_FLAG_MASK_INVERT(flag) ==
342        TIMER_FLAG_REAL ? GPTU_CON_INV_SET(0) : GPTU_CON_INV_SET(1);
343    con_reg |=
344        TIMER_FLAG_MASK_SIZE(flag) ==
345        TIMER_FLAG_16BIT ? GPTU_CON_EXT_SET(0) :
346        GPTU_CON_EXT_SET(1);
347    con_reg |=
348        TIMER_FLAG_MASK_STOP(flag) ==
349        TIMER_FLAG_ONCE ? GPTU_CON_STP_SET(1) : GPTU_CON_STP_SET(0);
350    con_reg |=
351        TIMER_FLAG_MASK_TYPE(flag) ==
352        TIMER_FLAG_TIMER ? GPTU_CON_CNT_SET(0) :
353        GPTU_CON_CNT_SET(1);
354    con_reg |=
355        TIMER_FLAG_MASK_DIR(flag) ==
356        TIMER_FLAG_UP ? GPTU_CON_DIR_SET(1) : GPTU_CON_DIR_SET(0);
357
358    /*
359     * Fill up running data.
360     */
361    timer_dev.timer[timer - FIRST_TIMER].flag = flag;
362    timer_dev.timer[timer - FIRST_TIMER].arg1 = arg1;
363    timer_dev.timer[timer - FIRST_TIMER].arg2 = arg2;
364    if (TIMER_FLAG_MASK_SIZE(flag) != TIMER_FLAG_16BIT)
365        timer_dev.timer[timer - FIRST_TIMER + 1].flag = flag;
366
367    /*
368     * Enable GPTU module.
369     */
370    if (!timer_dev.f_gptu_on) {
371        ifxmips_enable_gptu();
372        timer_dev.f_gptu_on = 1;
373    }
374
375    /*
376     * Enable IRQ.
377     */
378    if (TIMER_FLAG_MASK_HANDLE(flag) != TIMER_FLAG_NO_HANDLE) {
379        if (TIMER_FLAG_MASK_HANDLE(flag) == TIMER_FLAG_SIGNAL)
380            timer_dev.timer[timer - FIRST_TIMER].arg1 =
381                (unsigned long) find_task_by_vpid((int) arg1);
382
383        irnen_reg = 1 << (timer - FIRST_TIMER);
384
385        if (TIMER_FLAG_MASK_HANDLE(flag) == TIMER_FLAG_SIGNAL
386            || (TIMER_FLAG_MASK_HANDLE(flag) ==
387            TIMER_FLAG_CALLBACK_IN_IRQ
388            && timer_dev.timer[timer - FIRST_TIMER].arg1)) {
389            enable_irq(timer_dev.timer[timer - FIRST_TIMER].irq);
390            timer_dev.timer[timer - FIRST_TIMER].f_irq_on = 1;
391        }
392    } else
393        irnen_reg = 0;
394
395    /*
396     * Write config register, reload value and enable interrupt.
397     */
398    n = timer >> 1;
399    X = timer & 0x01;
400    *IFXMIPS_GPTU_CON(n, X) = con_reg;
401    *IFXMIPS_GPTU_RELOAD(n, X) = value;
402    /* printk("reload value = %d\n", (u32)value); */
403    *IFXMIPS_GPTU_IRNEN |= irnen_reg;
404
405    mutex_unlock(&timer_dev.gptu_mutex);
406    printk("successful!\n");
407    return ret;
408}
409EXPORT_SYMBOL(ifxmips_request_timer);
410
411int ifxmips_free_timer(unsigned int timer)
412{
413    unsigned int flag;
414    unsigned int mask;
415    int n, X;
416
417    if (!timer_dev.f_gptu_on)
418        return -EINVAL;
419
420    if (timer < FIRST_TIMER || timer >= FIRST_TIMER + timer_dev.number_of_timers)
421        return -EINVAL;
422
423    mutex_lock(&timer_dev.gptu_mutex);
424
425    flag = timer_dev.timer[timer - FIRST_TIMER].flag;
426    if (TIMER_FLAG_MASK_SIZE(flag) != TIMER_FLAG_16BIT)
427        timer &= ~0x01;
428
429    mask = (TIMER_FLAG_MASK_SIZE(flag) == TIMER_FLAG_16BIT ? 1 : 3) << timer;
430    if (((timer_dev.occupation & mask) ^ mask)) {
431        mutex_unlock(&timer_dev.gptu_mutex);
432        return -EINVAL;
433    }
434
435    n = timer >> 1;
436    X = timer & 0x01;
437
438    if (GPTU_CON_EN(n, X))
439        *IFXMIPS_GPTU_RUN(n, X) = GPTU_RUN_CEN_SET(1);
440
441    *IFXMIPS_GPTU_IRNEN &= ~GPTU_IRNEN_TC_SET(n, X, 1);
442    *IFXMIPS_GPTU_IRNCR |= GPTU_IRNCR_TC_SET(n, X, 1);
443
444    if (timer_dev.timer[timer - FIRST_TIMER].f_irq_on) {
445        disable_irq(timer_dev.timer[timer - FIRST_TIMER].irq);
446        timer_dev.timer[timer - FIRST_TIMER].f_irq_on = 0;
447    }
448
449    timer_dev.occupation &= ~mask;
450    if (!timer_dev.occupation && timer_dev.f_gptu_on) {
451        ifxmips_disable_gptu();
452        timer_dev.f_gptu_on = 0;
453    }
454
455    mutex_unlock(&timer_dev.gptu_mutex);
456
457    return 0;
458}
459EXPORT_SYMBOL(ifxmips_free_timer);
460
461int ifxmips_start_timer(unsigned int timer, int is_resume)
462{
463    unsigned int flag;
464    unsigned int mask;
465    int n, X;
466
467    if (!timer_dev.f_gptu_on)
468        return -EINVAL;
469
470    if (timer < FIRST_TIMER || timer >= FIRST_TIMER + timer_dev.number_of_timers)
471        return -EINVAL;
472
473    mutex_lock(&timer_dev.gptu_mutex);
474
475    flag = timer_dev.timer[timer - FIRST_TIMER].flag;
476    if (TIMER_FLAG_MASK_SIZE(flag) != TIMER_FLAG_16BIT)
477        timer &= ~0x01;
478
479    mask = (TIMER_FLAG_MASK_SIZE(flag) ==
480    TIMER_FLAG_16BIT ? 1 : 3) << timer;
481    if (((timer_dev.occupation & mask) ^ mask)) {
482        mutex_unlock(&timer_dev.gptu_mutex);
483        return -EINVAL;
484    }
485
486    n = timer >> 1;
487    X = timer & 0x01;
488
489    *IFXMIPS_GPTU_RUN(n, X) = GPTU_RUN_RL_SET(!is_resume) | GPTU_RUN_SEN_SET(1);
490
491    mutex_unlock(&timer_dev.gptu_mutex);
492
493    return 0;
494}
495EXPORT_SYMBOL(ifxmips_start_timer);
496
497int ifxmips_stop_timer(unsigned int timer)
498{
499    unsigned int flag;
500    unsigned int mask;
501    int n, X;
502
503    if (!timer_dev.f_gptu_on)
504        return -EINVAL;
505
506    if (timer < FIRST_TIMER
507        || timer >= FIRST_TIMER + timer_dev.number_of_timers)
508        return -EINVAL;
509
510    mutex_lock(&timer_dev.gptu_mutex);
511
512    flag = timer_dev.timer[timer - FIRST_TIMER].flag;
513    if (TIMER_FLAG_MASK_SIZE(flag) != TIMER_FLAG_16BIT)
514        timer &= ~0x01;
515
516    mask = (TIMER_FLAG_MASK_SIZE(flag) == TIMER_FLAG_16BIT ? 1 : 3) << timer;
517    if (((timer_dev.occupation & mask) ^ mask)) {
518        mutex_unlock(&timer_dev.gptu_mutex);
519        return -EINVAL;
520    }
521
522    n = timer >> 1;
523    X = timer & 0x01;
524
525    *IFXMIPS_GPTU_RUN(n, X) = GPTU_RUN_CEN_SET(1);
526
527    mutex_unlock(&timer_dev.gptu_mutex);
528
529    return 0;
530}
531EXPORT_SYMBOL(ifxmips_stop_timer);
532
533int ifxmips_reset_counter_flags(u32 timer, u32 flags)
534{
535    unsigned int oflag;
536    unsigned int mask, con_reg;
537    int n, X;
538
539    if (!timer_dev.f_gptu_on)
540        return -EINVAL;
541
542    if (timer < FIRST_TIMER || timer >= FIRST_TIMER + timer_dev.number_of_timers)
543        return -EINVAL;
544
545    mutex_lock(&timer_dev.gptu_mutex);
546
547    oflag = timer_dev.timer[timer - FIRST_TIMER].flag;
548    if (TIMER_FLAG_MASK_SIZE(oflag) != TIMER_FLAG_16BIT)
549        timer &= ~0x01;
550
551    mask = (TIMER_FLAG_MASK_SIZE(oflag) == TIMER_FLAG_16BIT ? 1 : 3) << timer;
552    if (((timer_dev.occupation & mask) ^ mask)) {
553        mutex_unlock(&timer_dev.gptu_mutex);
554        return -EINVAL;
555    }
556
557    switch (TIMER_FLAG_MASK_EDGE(flags)) {
558    default:
559    case TIMER_FLAG_NONE_EDGE:
560        con_reg = GPTU_CON_EDGE_SET(0x00);
561        break;
562    case TIMER_FLAG_RISE_EDGE:
563        con_reg = GPTU_CON_EDGE_SET(0x01);
564        break;
565    case TIMER_FLAG_FALL_EDGE:
566        con_reg = GPTU_CON_EDGE_SET(0x02);
567        break;
568    case TIMER_FLAG_ANY_EDGE:
569        con_reg = GPTU_CON_EDGE_SET(0x03);
570        break;
571    }
572    if (TIMER_FLAG_MASK_TYPE(flags) == TIMER_FLAG_TIMER)
573        con_reg |= TIMER_FLAG_MASK_SRC(flags) == TIMER_FLAG_EXT_SRC ? GPTU_CON_SRC_EXT_SET(1) : GPTU_CON_SRC_EXT_SET(0);
574    else
575        con_reg |= TIMER_FLAG_MASK_SRC(flags) == TIMER_FLAG_EXT_SRC ? GPTU_CON_SRC_EG_SET(1) : GPTU_CON_SRC_EG_SET(0);
576    con_reg |= TIMER_FLAG_MASK_SYNC(flags) == TIMER_FLAG_UNSYNC ? GPTU_CON_SYNC_SET(0) : GPTU_CON_SYNC_SET(1);
577    con_reg |= TIMER_FLAG_MASK_INVERT(flags) == TIMER_FLAG_REAL ? GPTU_CON_INV_SET(0) : GPTU_CON_INV_SET(1);
578    con_reg |= TIMER_FLAG_MASK_SIZE(flags) == TIMER_FLAG_16BIT ? GPTU_CON_EXT_SET(0) : GPTU_CON_EXT_SET(1);
579    con_reg |= TIMER_FLAG_MASK_STOP(flags) == TIMER_FLAG_ONCE ? GPTU_CON_STP_SET(1) : GPTU_CON_STP_SET(0);
580    con_reg |= TIMER_FLAG_MASK_TYPE(flags) == TIMER_FLAG_TIMER ? GPTU_CON_CNT_SET(0) : GPTU_CON_CNT_SET(1);
581    con_reg |= TIMER_FLAG_MASK_DIR(flags) == TIMER_FLAG_UP ? GPTU_CON_DIR_SET(1) : GPTU_CON_DIR_SET(0);
582
583    timer_dev.timer[timer - FIRST_TIMER].flag = flags;
584    if (TIMER_FLAG_MASK_SIZE(flags) != TIMER_FLAG_16BIT)
585        timer_dev.timer[timer - FIRST_TIMER + 1].flag = flags;
586
587    n = timer >> 1;
588    X = timer & 0x01;
589
590    *IFXMIPS_GPTU_CON(n, X) = con_reg;
591    smp_wmb();
592    printk(KERN_INFO "[%s]: counter%d oflags %#x, nflags %#x, GPTU_CON %#x\n", __func__, timer, oflag, flags, *IFXMIPS_GPTU_CON(n, X));
593    mutex_unlock(&timer_dev.gptu_mutex);
594    return 0;
595}
596EXPORT_SYMBOL(ifxmips_reset_counter_flags);
597
598int ifxmips_get_count_value(unsigned int timer, unsigned long *value)
599{
600    unsigned int flag;
601    unsigned int mask;
602    int n, X;
603
604    if (!timer_dev.f_gptu_on)
605        return -EINVAL;
606
607    if (timer < FIRST_TIMER
608        || timer >= FIRST_TIMER + timer_dev.number_of_timers)
609        return -EINVAL;
610
611    mutex_lock(&timer_dev.gptu_mutex);
612
613    flag = timer_dev.timer[timer - FIRST_TIMER].flag;
614    if (TIMER_FLAG_MASK_SIZE(flag) != TIMER_FLAG_16BIT)
615        timer &= ~0x01;
616
617    mask = (TIMER_FLAG_MASK_SIZE(flag) == TIMER_FLAG_16BIT ? 1 : 3) << timer;
618    if (((timer_dev.occupation & mask) ^ mask)) {
619        mutex_unlock(&timer_dev.gptu_mutex);
620        return -EINVAL;
621    }
622
623    n = timer >> 1;
624    X = timer & 0x01;
625
626    *value = *IFXMIPS_GPTU_COUNT(n, X);
627
628    mutex_unlock(&timer_dev.gptu_mutex);
629
630    return 0;
631}
632EXPORT_SYMBOL(ifxmips_get_count_value);
633
634u32 ifxmips_cal_divider(unsigned long freq)
635{
636    u64 module_freq, fpi = cgu_get_fpi_bus_clock(2);
637    u32 clock_divider = 1;
638    module_freq = fpi * 1000;
639    do_div(module_freq, clock_divider * freq);
640    return module_freq;
641}
642EXPORT_SYMBOL(ifxmips_cal_divider);
643
644int ifxmips_set_timer(unsigned int timer, unsigned int freq, int is_cyclic,
645    int is_ext_src, unsigned int handle_flag, unsigned long arg1,
646    unsigned long arg2)
647{
648    unsigned long divider;
649    unsigned int flag;
650
651    divider = ifxmips_cal_divider(freq);
652    if (divider == 0)
653        return -EINVAL;
654    flag = ((divider & ~0xFFFF) ? TIMER_FLAG_32BIT : TIMER_FLAG_16BIT)
655        | (is_cyclic ? TIMER_FLAG_CYCLIC : TIMER_FLAG_ONCE)
656        | (is_ext_src ? TIMER_FLAG_EXT_SRC : TIMER_FLAG_INT_SRC)
657        | TIMER_FLAG_TIMER | TIMER_FLAG_DOWN
658        | TIMER_FLAG_MASK_HANDLE(handle_flag);
659
660    printk(KERN_INFO "ifxmips_set_timer(%d, %d), divider = %lu\n",
661        timer, freq, divider);
662    return ifxmips_request_timer(timer, flag, divider, arg1, arg2);
663}
664EXPORT_SYMBOL(ifxmips_set_timer);
665
666int ifxmips_set_counter(unsigned int timer, unsigned int flag, u32 reload,
667    unsigned long arg1, unsigned long arg2)
668{
669    printk(KERN_INFO "ifxmips_set_counter(%d, %#x, %d)\n", timer, flag, reload);
670    return ifxmips_request_timer(timer, flag, reload, arg1, arg2);
671}
672EXPORT_SYMBOL(ifxmips_set_counter);
673
674static int gptu_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
675    unsigned long arg)
676{
677    int ret;
678    struct gptu_ioctl_param param;
679
680    if (!access_ok(VERIFY_READ, arg, sizeof(struct gptu_ioctl_param)))
681        return -EFAULT;
682    copy_from_user(&param, (void *) arg, sizeof(param));
683
684    if ((((cmd == GPTU_REQUEST_TIMER || cmd == GPTU_SET_TIMER
685           || GPTU_SET_COUNTER) && param.timer < 2)
686         || cmd == GPTU_GET_COUNT_VALUE || cmd == GPTU_CALCULATE_DIVIDER)
687        && !access_ok(VERIFY_WRITE, arg,
688               sizeof(struct gptu_ioctl_param)))
689        return -EFAULT;
690
691    switch (cmd) {
692    case GPTU_REQUEST_TIMER:
693        ret = ifxmips_request_timer(param.timer, param.flag, param.value,
694                     (unsigned long) param.pid,
695                     (unsigned long) param.sig);
696        if (ret > 0) {
697            copy_to_user(&((struct gptu_ioctl_param *) arg)->
698                      timer, &ret, sizeof(&ret));
699            ret = 0;
700        }
701        break;
702    case GPTU_FREE_TIMER:
703        ret = ifxmips_free_timer(param.timer);
704        break;
705    case GPTU_START_TIMER:
706        ret = ifxmips_start_timer(param.timer, param.flag);
707        break;
708    case GPTU_STOP_TIMER:
709        ret = ifxmips_stop_timer(param.timer);
710        break;
711    case GPTU_GET_COUNT_VALUE:
712        ret = ifxmips_get_count_value(param.timer, &param.value);
713        if (!ret)
714            copy_to_user(&((struct gptu_ioctl_param *) arg)->
715                      value, &param.value,
716                      sizeof(param.value));
717        break;
718    case GPTU_CALCULATE_DIVIDER:
719        param.value = ifxmips_cal_divider(param.value);
720        if (param.value == 0)
721            ret = -EINVAL;
722        else {
723            copy_to_user(&((struct gptu_ioctl_param *) arg)->
724                      value, &param.value,
725                      sizeof(param.value));
726            ret = 0;
727        }
728        break;
729    case GPTU_SET_TIMER:
730        ret = ifxmips_set_timer(param.timer, param.value,
731                 TIMER_FLAG_MASK_STOP(param.flag) !=
732                 TIMER_FLAG_ONCE ? 1 : 0,
733                 TIMER_FLAG_MASK_SRC(param.flag) ==
734                 TIMER_FLAG_EXT_SRC ? 1 : 0,
735                 TIMER_FLAG_MASK_HANDLE(param.flag) ==
736                 TIMER_FLAG_SIGNAL ? TIMER_FLAG_SIGNAL :
737                 TIMER_FLAG_NO_HANDLE,
738                 (unsigned long) param.pid,
739                 (unsigned long) param.sig);
740        if (ret > 0) {
741            copy_to_user(&((struct gptu_ioctl_param *) arg)->
742                      timer, &ret, sizeof(&ret));
743            ret = 0;
744        }
745        break;
746    case GPTU_SET_COUNTER:
747        ifxmips_set_counter(param.timer, param.flag, param.value, 0, 0);
748        if (ret > 0) {
749            copy_to_user(&((struct gptu_ioctl_param *) arg)->
750                      timer, &ret, sizeof(&ret));
751            ret = 0;
752        }
753        break;
754    default:
755        ret = -ENOTTY;
756    }
757
758    return ret;
759}
760
761static int gptu_open(struct inode *inode, struct file *file)
762{
763    return 0;
764}
765
766static int gptu_release(struct inode *inode, struct file *file)
767{
768    return 0;
769}
770
771int __init ifxmips_gptu_init(void)
772{
773    int ret;
774    unsigned int i;
775
776    ifxmips_w32(0, IFXMIPS_GPTU_IRNEN);
777    ifxmips_w32(0xfff, IFXMIPS_GPTU_IRNCR);
778
779    memset(&timer_dev, 0, sizeof(timer_dev));
780    mutex_init(&timer_dev.gptu_mutex);
781
782    ifxmips_enable_gptu();
783    timer_dev.number_of_timers = GPTU_ID_CFG * 2;
784    ifxmips_disable_gptu();
785    if (timer_dev.number_of_timers > MAX_NUM_OF_32BIT_TIMER_BLOCKS * 2)
786        timer_dev.number_of_timers = MAX_NUM_OF_32BIT_TIMER_BLOCKS * 2;
787    printk(KERN_INFO "gptu: totally %d 16-bit timers/counters\n", timer_dev.number_of_timers);
788
789    ret = misc_register(&gptu_miscdev);
790    if (ret) {
791        printk(KERN_ERR "gptu: can't misc_register, get error %d\n", -ret);
792        return ret;
793    } else {
794        printk(KERN_INFO "gptu: misc_register on minor %d\n", gptu_miscdev.minor);
795    }
796
797    for (i = 0; i < timer_dev.number_of_timers; i++) {
798        ret = request_irq(TIMER_INTERRUPT + i, timer_irq_handler, IRQF_TIMER, gptu_miscdev.name, &timer_dev.timer[i]);
799        if (ret) {
800            for (; i >= 0; i--)
801                free_irq(TIMER_INTERRUPT + i, &timer_dev.timer[i]);
802            misc_deregister(&gptu_miscdev);
803            printk(KERN_ERR "gptu: failed in requesting irq (%d), get error %d\n", i, -ret);
804            return ret;
805        } else {
806            timer_dev.timer[i].irq = TIMER_INTERRUPT + i;
807            disable_irq(timer_dev.timer[i].irq);
808            printk(KERN_INFO "gptu: succeeded to request irq %d\n", timer_dev.timer[i].irq);
809        }
810    }
811
812    return 0;
813}
814
815void __exit ifxmips_gptu_exit(void)
816{
817    unsigned int i;
818
819    for (i = 0; i < timer_dev.number_of_timers; i++) {
820        if (timer_dev.timer[i].f_irq_on)
821            disable_irq(timer_dev.timer[i].irq);
822        free_irq(timer_dev.timer[i].irq, &timer_dev.timer[i]);
823    }
824    ifxmips_disable_gptu();
825    misc_deregister(&gptu_miscdev);
826}
827
828module_init(ifxmips_gptu_init);
829module_exit(ifxmips_gptu_exit);
830

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