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Linux 3.8-rc7
[cris-mirror.git] / arch / cris / arch-v32 / drivers / mach-fs / gpio.c
bloba2ac0917f1a615989243bd3c1d0dc091c7f2d552
1 /*
2 * ETRAX CRISv32 general port I/O device
3 *
4 * Copyright (c) 1999-2006 Axis Communications AB
5 *
6 * Authors: Bjorn Wesen (initial version)
7 * Ola Knutsson (LED handling)
8 * Johan Adolfsson (read/set directions, write, port G,
9 * port to ETRAX FS.
10 *
11 */
12
13 #include <linux/module.h>
14 #include <linux/sched.h>
15 #include <linux/slab.h>
16 #include <linux/ioport.h>
17 #include <linux/errno.h>
18 #include <linux/kernel.h>
19 #include <linux/fs.h>
20 #include <linux/string.h>
21 #include <linux/poll.h>
22 #include <linux/init.h>
23 #include <linux/interrupt.h>
24 #include <linux/spinlock.h>
25 #include <linux/mutex.h>
26
27 #include <asm/etraxgpio.h>
28 #include <hwregs/reg_map.h>
29 #include <hwregs/reg_rdwr.h>
30 #include <hwregs/gio_defs.h>
31 #include <hwregs/intr_vect_defs.h>
32 #include <asm/io.h>
33 #include <asm/irq.h>
34
35 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
36 #include "../i2c.h"
37
38 #define VIRT_I2C_ADDR 0x40
39 #endif
40
41 /* The following gio ports on ETRAX FS is available:
42 * pa 8 bits, supports interrupts off, hi, low, set, posedge, negedge anyedge
43 * pb 18 bits
44 * pc 18 bits
45 * pd 18 bits
46 * pe 18 bits
47 * each port has a rw_px_dout, r_px_din and rw_px_oe register.
48 */
49
50 #define GPIO_MAJOR 120 /* experimental MAJOR number */
51
52 #define D(x)
53
54 #if 0
55 static int dp_cnt;
56 #define DP(x) \
57 do { \
58 dp_cnt++; \
59 if (dp_cnt % 1000 == 0) \
60 x; \
61 } while (0)
62 #else
63 #define DP(x)
64 #endif
65
66 static DEFINE_MUTEX(gpio_mutex);
67 static char gpio_name[] = "etrax gpio";
68
69 #if 0
70 static wait_queue_head_t *gpio_wq;
71 #endif
72
73 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
74 static int virtual_gpio_ioctl(struct file *file, unsigned int cmd,
75 unsigned long arg);
76 #endif
77 static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
78 static ssize_t gpio_write(struct file *file, const char *buf, size_t count,
79 loff_t *off);
80 static int gpio_open(struct inode *inode, struct file *filp);
81 static int gpio_release(struct inode *inode, struct file *filp);
82 static unsigned int gpio_poll(struct file *filp,
83 struct poll_table_struct *wait);
84
85 /* private data per open() of this driver */
86
87 struct gpio_private {
88 struct gpio_private *next;
89 /* The IO_CFG_WRITE_MODE_VALUE only support 8 bits: */
90 unsigned char clk_mask;
91 unsigned char data_mask;
92 unsigned char write_msb;
93 unsigned char pad1;
94 /* These fields are generic */
95 unsigned long highalarm, lowalarm;
96 wait_queue_head_t alarm_wq;
97 int minor;
98 };
99
100 /* linked list of alarms to check for */
101
102 static struct gpio_private *alarmlist;
103
104 static int gpio_some_alarms; /* Set if someone uses alarm */
105 static unsigned long gpio_pa_high_alarms;
106 static unsigned long gpio_pa_low_alarms;
107
108 static DEFINE_SPINLOCK(alarm_lock);
109
110 #define NUM_PORTS (GPIO_MINOR_LAST+1)
111 #define GIO_REG_RD_ADDR(reg) \
112 (volatile unsigned long *)(regi_gio + REG_RD_ADDR_gio_##reg)
113 #define GIO_REG_WR_ADDR(reg) \
114 (volatile unsigned long *)(regi_gio + REG_RD_ADDR_gio_##reg)
115 unsigned long led_dummy;
116 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
117 static unsigned long virtual_dummy;
118 static unsigned long virtual_rw_pv_oe = CONFIG_ETRAX_DEF_GIO_PV_OE;
119 static unsigned short cached_virtual_gpio_read;
120 #endif
121
122 static volatile unsigned long *data_out[NUM_PORTS] = {
123 GIO_REG_WR_ADDR(rw_pa_dout),
124 GIO_REG_WR_ADDR(rw_pb_dout),
125 &led_dummy,
126 GIO_REG_WR_ADDR(rw_pc_dout),
127 GIO_REG_WR_ADDR(rw_pd_dout),
128 GIO_REG_WR_ADDR(rw_pe_dout),
129 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
130 &virtual_dummy,
131 #endif
132 };
133
134 static volatile unsigned long *data_in[NUM_PORTS] = {
135 GIO_REG_RD_ADDR(r_pa_din),
136 GIO_REG_RD_ADDR(r_pb_din),
137 &led_dummy,
138 GIO_REG_RD_ADDR(r_pc_din),
139 GIO_REG_RD_ADDR(r_pd_din),
140 GIO_REG_RD_ADDR(r_pe_din),
141 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
142 &virtual_dummy,
143 #endif
144 };
145
146 static unsigned long changeable_dir[NUM_PORTS] = {
147 CONFIG_ETRAX_PA_CHANGEABLE_DIR,
148 CONFIG_ETRAX_PB_CHANGEABLE_DIR,
149 0,
150 CONFIG_ETRAX_PC_CHANGEABLE_DIR,
151 CONFIG_ETRAX_PD_CHANGEABLE_DIR,
152 CONFIG_ETRAX_PE_CHANGEABLE_DIR,
153 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
154 CONFIG_ETRAX_PV_CHANGEABLE_DIR,
155 #endif
156 };
157
158 static unsigned long changeable_bits[NUM_PORTS] = {
159 CONFIG_ETRAX_PA_CHANGEABLE_BITS,
160 CONFIG_ETRAX_PB_CHANGEABLE_BITS,
161 0,
162 CONFIG_ETRAX_PC_CHANGEABLE_BITS,
163 CONFIG_ETRAX_PD_CHANGEABLE_BITS,
164 CONFIG_ETRAX_PE_CHANGEABLE_BITS,
165 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
166 CONFIG_ETRAX_PV_CHANGEABLE_BITS,
167 #endif
168 };
169
170 static volatile unsigned long *dir_oe[NUM_PORTS] = {
171 GIO_REG_WR_ADDR(rw_pa_oe),
172 GIO_REG_WR_ADDR(rw_pb_oe),
173 &led_dummy,
174 GIO_REG_WR_ADDR(rw_pc_oe),
175 GIO_REG_WR_ADDR(rw_pd_oe),
176 GIO_REG_WR_ADDR(rw_pe_oe),
177 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
178 &virtual_rw_pv_oe,
179 #endif
180 };
181
182
183
184 static unsigned int gpio_poll(struct file *file, struct poll_table_struct *wait)
185 {
186 unsigned int mask = 0;
187 struct gpio_private *priv = file->private_data;
188 unsigned long data;
189 poll_wait(file, &priv->alarm_wq, wait);
190 if (priv->minor == GPIO_MINOR_A) {
191 reg_gio_rw_intr_cfg intr_cfg;
192 unsigned long tmp;
193 unsigned long flags;
194
195 local_irq_save(flags);
196 data = REG_TYPE_CONV(unsigned long, reg_gio_r_pa_din,
197 REG_RD(gio, regi_gio, r_pa_din));
198 /* PA has support for interrupt
199 * lets activate high for those low and with highalarm set
200 */
201 intr_cfg = REG_RD(gio, regi_gio, rw_intr_cfg);
202
203 tmp = ~data & priv->highalarm & 0xFF;
204 if (tmp & (1 << 0))
205 intr_cfg.pa0 = regk_gio_hi;
206 if (tmp & (1 << 1))
207 intr_cfg.pa1 = regk_gio_hi;
208 if (tmp & (1 << 2))
209 intr_cfg.pa2 = regk_gio_hi;
210 if (tmp & (1 << 3))
211 intr_cfg.pa3 = regk_gio_hi;
212 if (tmp & (1 << 4))
213 intr_cfg.pa4 = regk_gio_hi;
214 if (tmp & (1 << 5))
215 intr_cfg.pa5 = regk_gio_hi;
216 if (tmp & (1 << 6))
217 intr_cfg.pa6 = regk_gio_hi;
218 if (tmp & (1 << 7))
219 intr_cfg.pa7 = regk_gio_hi;
220 /*
221 * lets activate low for those high and with lowalarm set
222 */
223 tmp = data & priv->lowalarm & 0xFF;
224 if (tmp & (1 << 0))
225 intr_cfg.pa0 = regk_gio_lo;
226 if (tmp & (1 << 1))
227 intr_cfg.pa1 = regk_gio_lo;
228 if (tmp & (1 << 2))
229 intr_cfg.pa2 = regk_gio_lo;
230 if (tmp & (1 << 3))
231 intr_cfg.pa3 = regk_gio_lo;
232 if (tmp & (1 << 4))
233 intr_cfg.pa4 = regk_gio_lo;
234 if (tmp & (1 << 5))
235 intr_cfg.pa5 = regk_gio_lo;
236 if (tmp & (1 << 6))
237 intr_cfg.pa6 = regk_gio_lo;
238 if (tmp & (1 << 7))
239 intr_cfg.pa7 = regk_gio_lo;
240
241 REG_WR(gio, regi_gio, rw_intr_cfg, intr_cfg);
242 local_irq_restore(flags);
243 } else if (priv->minor <= GPIO_MINOR_E)
244 data = *data_in[priv->minor];
245 else
246 return 0;
247
248 if ((data & priv->highalarm) || (~data & priv->lowalarm))
249 mask = POLLIN|POLLRDNORM;
250
251 DP(printk(KERN_DEBUG "gpio_poll ready: mask 0x%08X\n", mask));
252 return mask;
253 }
254
255 int etrax_gpio_wake_up_check(void)
256 {
257 struct gpio_private *priv;
258 unsigned long data = 0;
259 unsigned long flags;
260 int ret = 0;
261 spin_lock_irqsave(&alarm_lock, flags);
262 priv = alarmlist;
263 while (priv) {
264 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
265 if (priv->minor == GPIO_MINOR_V)
266 data = (unsigned long)cached_virtual_gpio_read;
267 else {
268 data = *data_in[priv->minor];
269 if (priv->minor == GPIO_MINOR_A)
270 priv->lowalarm |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
271 }
272 #else
273 data = *data_in[priv->minor];
274 #endif
275 if ((data & priv->highalarm) ||
276 (~data & priv->lowalarm)) {
277 DP(printk(KERN_DEBUG
278 "etrax_gpio_wake_up_check %i\n", priv->minor));
279 wake_up_interruptible(&priv->alarm_wq);
280 ret = 1;
281 }
282 priv = priv->next;
283 }
284 spin_unlock_irqrestore(&alarm_lock, flags);
285 return ret;
286 }
287
288 static irqreturn_t
289 gpio_poll_timer_interrupt(int irq, void *dev_id)
290 {
291 if (gpio_some_alarms)
292 return IRQ_RETVAL(etrax_gpio_wake_up_check());
293 return IRQ_NONE;
294 }
295
296 static irqreturn_t
297 gpio_pa_interrupt(int irq, void *dev_id)
298 {
299 reg_gio_rw_intr_mask intr_mask;
300 reg_gio_r_masked_intr masked_intr;
301 reg_gio_rw_ack_intr ack_intr;
302 unsigned long tmp;
303 unsigned long tmp2;
304 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
305 unsigned char enable_gpiov_ack = 0;
306 #endif
307
308 /* Find what PA interrupts are active */
309 masked_intr = REG_RD(gio, regi_gio, r_masked_intr);
310 tmp = REG_TYPE_CONV(unsigned long, reg_gio_r_masked_intr, masked_intr);
311
312 /* Find those that we have enabled */
313 spin_lock(&alarm_lock);
314 tmp &= (gpio_pa_high_alarms | gpio_pa_low_alarms);
315 spin_unlock(&alarm_lock);
316
317 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
318 /* Something changed on virtual GPIO. Interrupt is acked by
319 * reading the device.
320 */
321 if (tmp & (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN)) {
322 i2c_read(VIRT_I2C_ADDR, (void *)&cached_virtual_gpio_read,
323 sizeof(cached_virtual_gpio_read));
324 enable_gpiov_ack = 1;
325 }
326 #endif
327
328 /* Ack them */
329 ack_intr = REG_TYPE_CONV(reg_gio_rw_ack_intr, unsigned long, tmp);
330 REG_WR(gio, regi_gio, rw_ack_intr, ack_intr);
331
332 /* Disable those interrupts.. */
333 intr_mask = REG_RD(gio, regi_gio, rw_intr_mask);
334 tmp2 = REG_TYPE_CONV(unsigned long, reg_gio_rw_intr_mask, intr_mask);
335 tmp2 &= ~tmp;
336 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
337 /* Do not disable interrupt on virtual GPIO. Changes on virtual
338 * pins are only noticed by an interrupt.
339 */
340 if (enable_gpiov_ack)
341 tmp2 |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
342 #endif
343 intr_mask = REG_TYPE_CONV(reg_gio_rw_intr_mask, unsigned long, tmp2);
344 REG_WR(gio, regi_gio, rw_intr_mask, intr_mask);
345
346 if (gpio_some_alarms)
347 return IRQ_RETVAL(etrax_gpio_wake_up_check());
348 return IRQ_NONE;
349 }
350
351
352 static ssize_t gpio_write(struct file *file, const char *buf, size_t count,
353 loff_t *off)
354 {
355 struct gpio_private *priv = file->private_data;
356 unsigned char data, clk_mask, data_mask, write_msb;
357 unsigned long flags;
358 unsigned long shadow;
359 volatile unsigned long *port;
360 ssize_t retval = count;
361 /* Only bits 0-7 may be used for write operations but allow all
362 devices except leds... */
363 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
364 if (priv->minor == GPIO_MINOR_V)
365 return -EFAULT;
366 #endif
367 if (priv->minor == GPIO_MINOR_LEDS)
368 return -EFAULT;
369
370 if (!access_ok(VERIFY_READ, buf, count))
371 return -EFAULT;
372 clk_mask = priv->clk_mask;
373 data_mask = priv->data_mask;
374 /* It must have been configured using the IO_CFG_WRITE_MODE */
375 /* Perhaps a better error code? */
376 if (clk_mask == 0 || data_mask == 0)
377 return -EPERM;
378 write_msb = priv->write_msb;
379 D(printk(KERN_DEBUG "gpio_write: %lu to data 0x%02X clk 0x%02X "
380 "msb: %i\n", count, data_mask, clk_mask, write_msb));
381 port = data_out[priv->minor];
382
383 while (count--) {
384 int i;
385 data = *buf++;
386 if (priv->write_msb) {
387 for (i = 7; i >= 0; i--) {
388 local_irq_save(flags);
389 shadow = *port;
390 *port = shadow &= ~clk_mask;
391 if (data & 1<<i)
392 *port = shadow |= data_mask;
393 else
394 *port = shadow &= ~data_mask;
395 /* For FPGA: min 5.0ns (DCC) before CCLK high */
396 *port = shadow |= clk_mask;
397 local_irq_restore(flags);
398 }
399 } else {
400 for (i = 0; i <= 7; i++) {
401 local_irq_save(flags);
402 shadow = *port;
403 *port = shadow &= ~clk_mask;
404 if (data & 1<<i)
405 *port = shadow |= data_mask;
406 else
407 *port = shadow &= ~data_mask;
408 /* For FPGA: min 5.0ns (DCC) before CCLK high */
409 *port = shadow |= clk_mask;
410 local_irq_restore(flags);
411 }
412 }
413 }
414 return retval;
415 }
416
417
418
419 static int
420 gpio_open(struct inode *inode, struct file *filp)
421 {
422 struct gpio_private *priv;
423 int p = iminor(inode);
424
425 if (p > GPIO_MINOR_LAST)
426 return -EINVAL;
427
428 priv = kmalloc(sizeof(struct gpio_private), GFP_KERNEL);
429 if (!priv)
430 return -ENOMEM;
431
432 mutex_lock(&gpio_mutex);
433 memset(priv, 0, sizeof(*priv));
434
435 priv->minor = p;
436
437 /* initialize the io/alarm struct */
438
439 priv->clk_mask = 0;
440 priv->data_mask = 0;
441 priv->highalarm = 0;
442 priv->lowalarm = 0;
443 init_waitqueue_head(&priv->alarm_wq);
444
445 filp->private_data = (void *)priv;
446
447 /* link it into our alarmlist */
448 spin_lock_irq(&alarm_lock);
449 priv->next = alarmlist;
450 alarmlist = priv;
451 spin_unlock_irq(&alarm_lock);
452
453 mutex_unlock(&gpio_mutex);
454 return 0;
455 }
456
457 static int
458 gpio_release(struct inode *inode, struct file *filp)
459 {
460 struct gpio_private *p;
461 struct gpio_private *todel;
462 /* local copies while updating them: */
463 unsigned long a_high, a_low;
464 unsigned long some_alarms;
465
466 /* unlink from alarmlist and free the private structure */
467
468 spin_lock_irq(&alarm_lock);
469 p = alarmlist;
470 todel = filp->private_data;
471
472 if (p == todel) {
473 alarmlist = todel->next;
474 } else {
475 while (p->next != todel)
476 p = p->next;
477 p->next = todel->next;
478 }
479
480 kfree(todel);
481 /* Check if there are still any alarms set */
482 p = alarmlist;
483 some_alarms = 0;
484 a_high = 0;
485 a_low = 0;
486 while (p) {
487 if (p->minor == GPIO_MINOR_A) {
488 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
489 p->lowalarm |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
490 #endif
491 a_high |= p->highalarm;
492 a_low |= p->lowalarm;
493 }
494
495 if (p->highalarm | p->lowalarm)
496 some_alarms = 1;
497 p = p->next;
498 }
499
500 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
501 /* Variables 'some_alarms' and 'a_low' needs to be set here again
502 * to ensure that interrupt for virtual GPIO is handled.
503 */
504 some_alarms = 1;
505 a_low |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
506 #endif
507
508 gpio_some_alarms = some_alarms;
509 gpio_pa_high_alarms = a_high;
510 gpio_pa_low_alarms = a_low;
511 spin_unlock_irq(&alarm_lock);
512
513 return 0;
514 }
515
516 /* Main device API. ioctl's to read/set/clear bits, as well as to
517 * set alarms to wait for using a subsequent select().
518 */
519
520 inline unsigned long setget_input(struct gpio_private *priv, unsigned long arg)
521 {
522 /* Set direction 0=unchanged 1=input,
523 * return mask with 1=input
524 */
525 unsigned long flags;
526 unsigned long dir_shadow;
527
528 local_irq_save(flags);
529 dir_shadow = *dir_oe[priv->minor];
530 dir_shadow &= ~(arg & changeable_dir[priv->minor]);
531 *dir_oe[priv->minor] = dir_shadow;
532 local_irq_restore(flags);
533
534 if (priv->minor == GPIO_MINOR_A)
535 dir_shadow ^= 0xFF; /* Only 8 bits */
536 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
537 else if (priv->minor == GPIO_MINOR_V)
538 dir_shadow ^= 0xFFFF; /* Only 16 bits */
539 #endif
540 else
541 dir_shadow ^= 0x3FFFF; /* Only 18 bits */
542 return dir_shadow;
543
544 } /* setget_input */
545
546 inline unsigned long setget_output(struct gpio_private *priv, unsigned long arg)
547 {
548 unsigned long flags;
549 unsigned long dir_shadow;
550
551 local_irq_save(flags);
552 dir_shadow = *dir_oe[priv->minor];
553 dir_shadow |= (arg & changeable_dir[priv->minor]);
554 *dir_oe[priv->minor] = dir_shadow;
555 local_irq_restore(flags);
556 return dir_shadow;
557 } /* setget_output */
558
559 static int gpio_leds_ioctl(unsigned int cmd, unsigned long arg);
560
561 static int
562 gpio_ioctl_unlocked(struct file *file, unsigned int cmd, unsigned long arg)
563 {
564 unsigned long flags;
565 unsigned long val;
566 unsigned long shadow;
567 struct gpio_private *priv = file->private_data;
568 if (_IOC_TYPE(cmd) != ETRAXGPIO_IOCTYPE)
569 return -EINVAL;
570
571 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
572 if (priv->minor == GPIO_MINOR_V)
573 return virtual_gpio_ioctl(file, cmd, arg);
574 #endif
575
576 switch (_IOC_NR(cmd)) {
577 case IO_READBITS: /* Use IO_READ_INBITS and IO_READ_OUTBITS instead */
578 /* Read the port. */
579 return *data_in[priv->minor];
580 break;
581 case IO_SETBITS:
582 local_irq_save(flags);
583 /* Set changeable bits with a 1 in arg. */
584 shadow = *data_out[priv->minor];
585 shadow |= (arg & changeable_bits[priv->minor]);
586 *data_out[priv->minor] = shadow;
587 local_irq_restore(flags);
588 break;
589 case IO_CLRBITS:
590 local_irq_save(flags);
591 /* Clear changeable bits with a 1 in arg. */
592 shadow = *data_out[priv->minor];
593 shadow &= ~(arg & changeable_bits[priv->minor]);
594 *data_out[priv->minor] = shadow;
595 local_irq_restore(flags);
596 break;
597 case IO_HIGHALARM:
598 /* Set alarm when bits with 1 in arg go high. */
599 priv->highalarm |= arg;
600 spin_lock_irqsave(&alarm_lock, flags);
601 gpio_some_alarms = 1;
602 if (priv->minor == GPIO_MINOR_A)
603 gpio_pa_high_alarms |= arg;
604 spin_unlock_irqrestore(&alarm_lock, flags);
605 break;
606 case IO_LOWALARM:
607 /* Set alarm when bits with 1 in arg go low. */
608 priv->lowalarm |= arg;
609 spin_lock_irqsave(&alarm_lock, flags);
610 gpio_some_alarms = 1;
611 if (priv->minor == GPIO_MINOR_A)
612 gpio_pa_low_alarms |= arg;
613 spin_unlock_irqrestore(&alarm_lock, flags);
614 break;
615 case IO_CLRALARM:
616 /* Clear alarm for bits with 1 in arg. */
617 priv->highalarm &= ~arg;
618 priv->lowalarm &= ~arg;
619 spin_lock_irqsave(&alarm_lock, flags);
620 if (priv->minor == GPIO_MINOR_A) {
621 if (gpio_pa_high_alarms & arg ||
622 gpio_pa_low_alarms & arg)
623 /* Must update the gpio_pa_*alarms masks */
624 ;
625 }
626 spin_unlock_irqrestore(&alarm_lock, flags);
627 break;
628 case IO_READDIR: /* Use IO_SETGET_INPUT/OUTPUT instead! */
629 /* Read direction 0=input 1=output */
630 return *dir_oe[priv->minor];
631 case IO_SETINPUT: /* Use IO_SETGET_INPUT instead! */
632 /* Set direction 0=unchanged 1=input,
633 * return mask with 1=input
634 */
635 return setget_input(priv, arg);
636 break;
637 case IO_SETOUTPUT: /* Use IO_SETGET_OUTPUT instead! */
638 /* Set direction 0=unchanged 1=output,
639 * return mask with 1=output
640 */
641 return setget_output(priv, arg);
642
643 case IO_CFG_WRITE_MODE:
644 {
645 unsigned long dir_shadow;
646 dir_shadow = *dir_oe[priv->minor];
647
648 priv->clk_mask = arg & 0xFF;
649 priv->data_mask = (arg >> 8) & 0xFF;
650 priv->write_msb = (arg >> 16) & 0x01;
651 /* Check if we're allowed to change the bits and
652 * the direction is correct
653 */
654 if (!((priv->clk_mask & changeable_bits[priv->minor]) &&
655 (priv->data_mask & changeable_bits[priv->minor]) &&
656 (priv->clk_mask & dir_shadow) &&
657 (priv->data_mask & dir_shadow))) {
658 priv->clk_mask = 0;
659 priv->data_mask = 0;
660 return -EPERM;
661 }
662 break;
663 }
664 case IO_READ_INBITS:
665 /* *arg is result of reading the input pins */
666 val = *data_in[priv->minor];
667 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
668 return -EFAULT;
669 return 0;
670 break;
671 case IO_READ_OUTBITS:
672 /* *arg is result of reading the output shadow */
673 val = *data_out[priv->minor];
674 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
675 return -EFAULT;
676 break;
677 case IO_SETGET_INPUT:
678 /* bits set in *arg is set to input,
679 * *arg updated with current input pins.
680 */
681 if (copy_from_user(&val, (unsigned long *)arg, sizeof(val)))
682 return -EFAULT;
683 val = setget_input(priv, val);
684 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
685 return -EFAULT;
686 break;
687 case IO_SETGET_OUTPUT:
688 /* bits set in *arg is set to output,
689 * *arg updated with current output pins.
690 */
691 if (copy_from_user(&val, (unsigned long *)arg, sizeof(val)))
692 return -EFAULT;
693 val = setget_output(priv, val);
694 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
695 return -EFAULT;
696 break;
697 default:
698 if (priv->minor == GPIO_MINOR_LEDS)
699 return gpio_leds_ioctl(cmd, arg);
700 else
701 return -EINVAL;
702 } /* switch */
703
704 return 0;
705 }
706
707 static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
708 {
709 long ret;
710
711 mutex_lock(&gpio_mutex);
712 ret = gpio_ioctl_unlocked(file, cmd, arg);
713 mutex_unlock(&gpio_mutex);
714
715 return ret;
716 }
717
718 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
719 static int
720 virtual_gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
721 {
722 unsigned long flags;
723 unsigned short val;
724 unsigned short shadow;
725 struct gpio_private *priv = file->private_data;
726
727 switch (_IOC_NR(cmd)) {
728 case IO_SETBITS:
729 local_irq_save(flags);
730 /* Set changeable bits with a 1 in arg. */
731 i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
732 shadow |= ~*dir_oe[priv->minor];
733 shadow |= (arg & changeable_bits[priv->minor]);
734 i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
735 local_irq_restore(flags);
736 break;
737 case IO_CLRBITS:
738 local_irq_save(flags);
739 /* Clear changeable bits with a 1 in arg. */
740 i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
741 shadow |= ~*dir_oe[priv->minor];
742 shadow &= ~(arg & changeable_bits[priv->minor]);
743 i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
744 local_irq_restore(flags);
745 break;
746 case IO_HIGHALARM:
747 /* Set alarm when bits with 1 in arg go high. */
748 priv->highalarm |= arg;
749 spin_lock(&alarm_lock);
750 gpio_some_alarms = 1;
751 spin_unlock(&alarm_lock);
752 break;
753 case IO_LOWALARM:
754 /* Set alarm when bits with 1 in arg go low. */
755 priv->lowalarm |= arg;
756 spin_lock(&alarm_lock);
757 gpio_some_alarms = 1;
758 spin_unlock(&alarm_lock);
759 break;
760 case IO_CLRALARM:
761 /* Clear alarm for bits with 1 in arg. */
762 priv->highalarm &= ~arg;
763 priv->lowalarm &= ~arg;
764 spin_lock(&alarm_lock);
765 spin_unlock(&alarm_lock);
766 break;
767 case IO_CFG_WRITE_MODE:
768 {
769 unsigned long dir_shadow;
770 dir_shadow = *dir_oe[priv->minor];
771
772 priv->clk_mask = arg & 0xFF;
773 priv->data_mask = (arg >> 8) & 0xFF;
774 priv->write_msb = (arg >> 16) & 0x01;
775 /* Check if we're allowed to change the bits and
776 * the direction is correct
777 */
778 if (!((priv->clk_mask & changeable_bits[priv->minor]) &&
779 (priv->data_mask & changeable_bits[priv->minor]) &&
780 (priv->clk_mask & dir_shadow) &&
781 (priv->data_mask & dir_shadow))) {
782 priv->clk_mask = 0;
783 priv->data_mask = 0;
784 return -EPERM;
785 }
786 break;
787 }
788 case IO_READ_INBITS:
789 /* *arg is result of reading the input pins */
790 val = cached_virtual_gpio_read;
791 val &= ~*dir_oe[priv->minor];
792 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
793 return -EFAULT;
794 return 0;
795 break;
796 case IO_READ_OUTBITS:
797 /* *arg is result of reading the output shadow */
798 i2c_read(VIRT_I2C_ADDR, (void *)&val, sizeof(val));
799 val &= *dir_oe[priv->minor];
800 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
801 return -EFAULT;
802 break;
803 case IO_SETGET_INPUT:
804 {
805 /* bits set in *arg is set to input,
806 * *arg updated with current input pins.
807 */
808 unsigned short input_mask = ~*dir_oe[priv->minor];
809 if (copy_from_user(&val, (unsigned long *)arg, sizeof(val)))
810 return -EFAULT;
811 val = setget_input(priv, val);
812 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
813 return -EFAULT;
814 if ((input_mask & val) != input_mask) {
815 /* Input pins changed. All ports desired as input
816 * should be set to logic 1.
817 */
818 unsigned short change = input_mask ^ val;
819 i2c_read(VIRT_I2C_ADDR, (void *)&shadow,
820 sizeof(shadow));
821 shadow &= ~change;
822 shadow |= val;
823 i2c_write(VIRT_I2C_ADDR, (void *)&shadow,
824 sizeof(shadow));
825 }
826 break;
827 }
828 case IO_SETGET_OUTPUT:
829 /* bits set in *arg is set to output,
830 * *arg updated with current output pins.
831 */
832 if (copy_from_user(&val, (unsigned long *)arg, sizeof(val)))
833 return -EFAULT;
834 val = setget_output(priv, val);
835 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
836 return -EFAULT;
837 break;
838 default:
839 return -EINVAL;
840 } /* switch */
841 return 0;
842 }
843 #endif /* CONFIG_ETRAX_VIRTUAL_GPIO */
844
845 static int
846 gpio_leds_ioctl(unsigned int cmd, unsigned long arg)
847 {
848 unsigned char green;
849 unsigned char red;
850
851 switch (_IOC_NR(cmd)) {
852 case IO_LEDACTIVE_SET:
853 green = ((unsigned char) arg) & 1;
854 red = (((unsigned char) arg) >> 1) & 1;
855 CRIS_LED_ACTIVE_SET_G(green);
856 CRIS_LED_ACTIVE_SET_R(red);
857 break;
858
859 default:
860 return -EINVAL;
861 } /* switch */
862
863 return 0;
864 }
865
866 static const struct file_operations gpio_fops = {
867 .owner = THIS_MODULE,
868 .poll = gpio_poll,
869 .unlocked_ioctl = gpio_ioctl,
870 .write = gpio_write,
871 .open = gpio_open,
872 .release = gpio_release,
873 .llseek = noop_llseek,
874 };
875
876 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
877 static void
878 virtual_gpio_init(void)
879 {
880 reg_gio_rw_intr_cfg intr_cfg;
881 reg_gio_rw_intr_mask intr_mask;
882 unsigned short shadow;
883
884 shadow = ~virtual_rw_pv_oe; /* Input ports should be set to logic 1 */
885 shadow |= CONFIG_ETRAX_DEF_GIO_PV_OUT;
886 i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
887
888 /* Set interrupt mask and on what state the interrupt shall trigger.
889 * For virtual gpio the interrupt shall trigger on logic '0'.
890 */
891 intr_cfg = REG_RD(gio, regi_gio, rw_intr_cfg);
892 intr_mask = REG_RD(gio, regi_gio, rw_intr_mask);
893
894 switch (CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN) {
895 case 0:
896 intr_cfg.pa0 = regk_gio_lo;
897 intr_mask.pa0 = regk_gio_yes;
898 break;
899 case 1:
900 intr_cfg.pa1 = regk_gio_lo;
901 intr_mask.pa1 = regk_gio_yes;
902 break;
903 case 2:
904 intr_cfg.pa2 = regk_gio_lo;
905 intr_mask.pa2 = regk_gio_yes;
906 break;
907 case 3:
908 intr_cfg.pa3 = regk_gio_lo;
909 intr_mask.pa3 = regk_gio_yes;
910 break;
911 case 4:
912 intr_cfg.pa4 = regk_gio_lo;
913 intr_mask.pa4 = regk_gio_yes;
914 break;
915 case 5:
916 intr_cfg.pa5 = regk_gio_lo;
917 intr_mask.pa5 = regk_gio_yes;
918 break;
919 case 6:
920 intr_cfg.pa6 = regk_gio_lo;
921 intr_mask.pa6 = regk_gio_yes;
922 break;
923 case 7:
924 intr_cfg.pa7 = regk_gio_lo;
925 intr_mask.pa7 = regk_gio_yes;
926 break;
927 }
928
929 REG_WR(gio, regi_gio, rw_intr_cfg, intr_cfg);
930 REG_WR(gio, regi_gio, rw_intr_mask, intr_mask);
931
932 gpio_pa_low_alarms |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
933 gpio_some_alarms = 1;
934 }
935 #endif
936
937 /* main driver initialization routine, called from mem.c */
938
939 static __init int
940 gpio_init(void)
941 {
942 int res;
943
944 /* do the formalities */
945
946 res = register_chrdev(GPIO_MAJOR, gpio_name, &gpio_fops);
947 if (res < 0) {
948 printk(KERN_ERR "gpio: couldn't get a major number.\n");
949 return res;
950 }
951
952 /* Clear all leds */
953 CRIS_LED_NETWORK_GRP0_SET(0);
954 CRIS_LED_NETWORK_GRP1_SET(0);
955 CRIS_LED_ACTIVE_SET(0);
956 CRIS_LED_DISK_READ(0);
957 CRIS_LED_DISK_WRITE(0);
958
959 printk(KERN_INFO "ETRAX FS GPIO driver v2.5, (c) 2003-2007 "
960 "Axis Communications AB\n");
961 /* We call etrax_gpio_wake_up_check() from timer interrupt and
962 * from cpu_idle() in kernel/process.c
963 * The check in cpu_idle() reduces latency from ~15 ms to ~6 ms
964 * in some tests.
965 */
966 if (request_irq(TIMER0_INTR_VECT, gpio_poll_timer_interrupt,
967 IRQF_SHARED | IRQF_DISABLED, "gpio poll", &alarmlist))
968 printk(KERN_ERR "timer0 irq for gpio\n");
969
970 if (request_irq(GIO_INTR_VECT, gpio_pa_interrupt,
971 IRQF_SHARED | IRQF_DISABLED, "gpio PA", &alarmlist))
972 printk(KERN_ERR "PA irq for gpio\n");
973
974 #ifdef CONFIG_ETRAX_VIRTUAL_GPIO
975 virtual_gpio_init();
976 #endif
977
978 return res;
979 }
980
981 /* this makes sure that gpio_init is called during kernel boot */
982
983 module_init(gpio_init);
CRIS linux kernel tree