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[net-next-2.6.git] / arch / cris / arch-v32 / drivers / mach-fs / gpio.c
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6107c61f
JN		 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
26#include <asm/etraxgpio.h>
27#include <hwregs/reg_map.h>
28#include <hwregs/reg_rdwr.h>
29#include <hwregs/gio_defs.h>
30#include <hwregs/intr_vect_defs.h>
31#include <asm/io.h>
32#include <asm/system.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
55static 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
66static char gpio_name[] = "etrax gpio";
67
68#if 0
69static wait_queue_head_t *gpio_wq;
70#endif
71
72#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
73static int virtual_gpio_ioctl(struct file *file, unsigned int cmd,
74 unsigned long arg);
75#endif
76static int gpio_ioctl(struct inode *inode, struct file *file,
77 unsigned int cmd, unsigned long arg);
78static ssize_t gpio_write(struct file *file, const char *buf, size_t count,
79 loff_t *off);
80static int gpio_open(struct inode *inode, struct file *filp);
81static int gpio_release(struct inode *inode, struct file *filp);
82static unsigned int gpio_poll(struct file *filp,
83 struct poll_table_struct *wait);
84
85/* private data per open() of this driver */
86
87struct 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
102static struct gpio_private *alarmlist;
103
104static int gpio_some_alarms; /* Set if someone uses alarm */
105static unsigned long gpio_pa_high_alarms;
106static unsigned long gpio_pa_low_alarms;
107
108static 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)
115unsigned long led_dummy;
116#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
117static unsigned long virtual_dummy;
118static unsigned long virtual_rw_pv_oe = CONFIG_ETRAX_DEF_GIO_PV_OE;
119static unsigned short cached_virtual_gpio_read;
120#endif
121
122static 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
134static 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
146static 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
158static 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
170static 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
2c30da71 184static unsigned int gpio_poll(struct file *file, struct poll_table_struct *wait)
6107c61f
JN		 185{
186 unsigned int mask = 0;
187 struct gpio_private *priv = (struct gpio_private *)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
255int 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
288static irqreturn_t
289gpio_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
296static irqreturn_t
297gpio_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
352static ssize_t gpio_write(struct file *file, const char *buf, size_t count,
353 loff_t *off)
354{
355 struct gpio_private *priv = (struct gpio_private *)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
419static int
420gpio_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
430 if (!priv)
431 return -ENOMEM;
432 memset(priv, 0, sizeof(*priv));
433
434 priv->minor = p;
435
436 /* initialize the io/alarm struct */
437
438 priv->clk_mask = 0;
439 priv->data_mask = 0;
440 priv->highalarm = 0;
441 priv->lowalarm = 0;
442 init_waitqueue_head(&priv->alarm_wq);
443
444 filp->private_data = (void *)priv;
445
446 /* link it into our alarmlist */
447 spin_lock_irq(&alarm_lock);
448 priv->next = alarmlist;
449 alarmlist = priv;
450 spin_unlock_irq(&alarm_lock);
451
452 return 0;
453}
454
455static int
456gpio_release(struct inode *inode, struct file *filp)
457{
458 struct gpio_private *p;
459 struct gpio_private *todel;
460 /* local copies while updating them: */
461 unsigned long a_high, a_low;
462 unsigned long some_alarms;
463
464 /* unlink from alarmlist and free the private structure */
465
466 spin_lock_irq(&alarm_lock);
467 p = alarmlist;
468 todel = (struct gpio_private *)filp->private_data;
469
470 if (p == todel) {
471 alarmlist = todel->next;
472 } else {
473 while (p->next != todel)
474 p = p->next;
475 p->next = todel->next;
476 }
477
478 kfree(todel);
479 /* Check if there are still any alarms set */
480 p = alarmlist;
481 some_alarms = 0;
482 a_high = 0;
483 a_low = 0;
484 while (p) {
485 if (p->minor == GPIO_MINOR_A) {
486#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
487 p->lowalarm |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
488#endif
489 a_high |= p->highalarm;
490 a_low |= p->lowalarm;
491 }
492
493 if (p->highalarm | p->lowalarm)
494 some_alarms = 1;
495 p = p->next;
496 }
497
498#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
499 /* Variables 'some_alarms' and 'a_low' needs to be set here again
500 * to ensure that interrupt for virtual GPIO is handled.
501 */
502 some_alarms = 1;
503 a_low |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
504#endif
505
506 gpio_some_alarms = some_alarms;
507 gpio_pa_high_alarms = a_high;
508 gpio_pa_low_alarms = a_low;
509 spin_unlock_irq(&alarm_lock);
510
511 return 0;
512}
513
514/* Main device API. ioctl's to read/set/clear bits, as well as to
515 * set alarms to wait for using a subsequent select().
516 */
517
518inline unsigned long setget_input(struct gpio_private *priv, unsigned long arg)
519{
520 /* Set direction 0=unchanged 1=input,
521 * return mask with 1=input
522 */
523 unsigned long flags;
524 unsigned long dir_shadow;
525
526 local_irq_save(flags);
527 dir_shadow = *dir_oe[priv->minor];
528 dir_shadow &= ~(arg & changeable_dir[priv->minor]);
529 *dir_oe[priv->minor] = dir_shadow;
530 local_irq_restore(flags);
531
532 if (priv->minor == GPIO_MINOR_A)
533 dir_shadow ^= 0xFF; /* Only 8 bits */
534#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
535 else if (priv->minor == GPIO_MINOR_V)
536 dir_shadow ^= 0xFFFF; /* Only 16 bits */
537#endif
538 else
539 dir_shadow ^= 0x3FFFF; /* Only 18 bits */
540 return dir_shadow;
541
542} /* setget_input */
543
544inline unsigned long setget_output(struct gpio_private *priv, unsigned long arg)
545{
546 unsigned long flags;
547 unsigned long dir_shadow;
548
549 local_irq_save(flags);
550 dir_shadow = *dir_oe[priv->minor];
551 dir_shadow |= (arg & changeable_dir[priv->minor]);
552 *dir_oe[priv->minor] = dir_shadow;
553 local_irq_restore(flags);
554 return dir_shadow;
555} /* setget_output */
556
557static int
558gpio_leds_ioctl(unsigned int cmd, unsigned long arg);
559
560static int
561gpio_ioctl(struct inode *inode, struct file *file,
562 unsigned int cmd, unsigned long arg)
563{
564 unsigned long flags;
565 unsigned long val;
566 unsigned long shadow;
567 struct gpio_private *priv = (struct gpio_private *)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#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
708static int
709virtual_gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
710{
711 unsigned long flags;
712 unsigned short val;
713 unsigned short shadow;
714 struct gpio_private *priv = (struct gpio_private *)file->private_data;
715
716 switch (_IOC_NR(cmd)) {
717 case IO_SETBITS:
718 local_irq_save(flags);
719 /* Set changeable bits with a 1 in arg. */
720 i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
721 shadow |= ~*dir_oe[priv->minor];
722 shadow |= (arg & changeable_bits[priv->minor]);
723 i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
724 local_irq_restore(flags);
725 break;
726 case IO_CLRBITS:
727 local_irq_save(flags);
728 /* Clear changeable bits with a 1 in arg. */
729 i2c_read(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
730 shadow |= ~*dir_oe[priv->minor];
731 shadow &= ~(arg & changeable_bits[priv->minor]);
732 i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
733 local_irq_restore(flags);
734 break;
735 case IO_HIGHALARM:
736 /* Set alarm when bits with 1 in arg go high. */
737 priv->highalarm |= arg;
738 spin_lock(&alarm_lock);
739 gpio_some_alarms = 1;
740 spin_unlock(&alarm_lock);
741 break;
742 case IO_LOWALARM:
743 /* Set alarm when bits with 1 in arg go low. */
744 priv->lowalarm |= arg;
745 spin_lock(&alarm_lock);
746 gpio_some_alarms = 1;
747 spin_unlock(&alarm_lock);
748 break;
749 case IO_CLRALARM:
750 /* Clear alarm for bits with 1 in arg. */
751 priv->highalarm &= ~arg;
752 priv->lowalarm &= ~arg;
753 spin_lock(&alarm_lock);
754 spin_unlock(&alarm_lock);
755 break;
756 case IO_CFG_WRITE_MODE:
757 {
758 unsigned long dir_shadow;
759 dir_shadow = *dir_oe[priv->minor];
760
761 priv->clk_mask = arg & 0xFF;
762 priv->data_mask = (arg >> 8) & 0xFF;
763 priv->write_msb = (arg >> 16) & 0x01;
764 /* Check if we're allowed to change the bits and
765 * the direction is correct
766 */
767 if (!((priv->clk_mask & changeable_bits[priv->minor]) &&
768 (priv->data_mask & changeable_bits[priv->minor]) &&
769 (priv->clk_mask & dir_shadow) &&
770 (priv->data_mask & dir_shadow))) {
771 priv->clk_mask = 0;
772 priv->data_mask = 0;
773 return -EPERM;
774 }
775 break;
776 }
777 case IO_READ_INBITS:
778 /* *arg is result of reading the input pins */
779 val = cached_virtual_gpio_read;
780 val &= ~*dir_oe[priv->minor];
781 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
782 return -EFAULT;
783 return 0;
784 break;
785 case IO_READ_OUTBITS:
786 /* *arg is result of reading the output shadow */
787 i2c_read(VIRT_I2C_ADDR, (void *)&val, sizeof(val));
788 val &= *dir_oe[priv->minor];
789 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
790 return -EFAULT;
791 break;
792 case IO_SETGET_INPUT:
793 {
794 /* bits set in *arg is set to input,
795 * *arg updated with current input pins.
796 */
797 unsigned short input_mask = ~*dir_oe[priv->minor];
798 if (copy_from_user(&val, (unsigned long *)arg, sizeof(val)))
799 return -EFAULT;
800 val = setget_input(priv, val);
801 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
802 return -EFAULT;
803 if ((input_mask & val) != input_mask) {
804 /* Input pins changed. All ports desired as input
805 * should be set to logic 1.
806 */
807 unsigned short change = input_mask ^ val;
808 i2c_read(VIRT_I2C_ADDR, (void *)&shadow,
809 sizeof(shadow));
810 shadow &= ~change;
811 shadow |= val;
812 i2c_write(VIRT_I2C_ADDR, (void *)&shadow,
813 sizeof(shadow));
814 }
815 break;
816 }
817 case IO_SETGET_OUTPUT:
818 /* bits set in *arg is set to output,
819 * *arg updated with current output pins.
820 */
821 if (copy_from_user(&val, (unsigned long *)arg, sizeof(val)))
822 return -EFAULT;
823 val = setget_output(priv, val);
824 if (copy_to_user((unsigned long *)arg, &val, sizeof(val)))
825 return -EFAULT;
826 break;
827 default:
828 return -EINVAL;
829 } /* switch */
830 return 0;
831}
832#endif /* CONFIG_ETRAX_VIRTUAL_GPIO */
833
834static int
835gpio_leds_ioctl(unsigned int cmd, unsigned long arg)
836{
837 unsigned char green;
838 unsigned char red;
839
840 switch (_IOC_NR(cmd)) {
841 case IO_LEDACTIVE_SET:
842 green = ((unsigned char) arg) & 1;
843 red = (((unsigned char) arg) >> 1) & 1;
2c30da71
JN		 844 CRIS_LED_ACTIVE_SET_G(green);
845 CRIS_LED_ACTIVE_SET_R(red);
6107c61f
JN		 846 break;
847
848 default:
849 return -EINVAL;
850 } /* switch */
851
852 return 0;
853}
854
855struct file_operations gpio_fops = {
856 .owner = THIS_MODULE,
857 .poll = gpio_poll,
858 .ioctl = gpio_ioctl,
859 .write = gpio_write,
860 .open = gpio_open,
861 .release = gpio_release,
862};
863
864#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
865static void
866virtual_gpio_init(void)
867{
868 reg_gio_rw_intr_cfg intr_cfg;
869 reg_gio_rw_intr_mask intr_mask;
870 unsigned short shadow;
871
872 shadow = ~virtual_rw_pv_oe; /* Input ports should be set to logic 1 */
873 shadow |= CONFIG_ETRAX_DEF_GIO_PV_OUT;
874 i2c_write(VIRT_I2C_ADDR, (void *)&shadow, sizeof(shadow));
875
876 /* Set interrupt mask and on what state the interrupt shall trigger.
877 * For virtual gpio the interrupt shall trigger on logic '0'.
878 */
879 intr_cfg = REG_RD(gio, regi_gio, rw_intr_cfg);
880 intr_mask = REG_RD(gio, regi_gio, rw_intr_mask);
881
882 switch (CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN) {
883 case 0:
884 intr_cfg.pa0 = regk_gio_lo;
885 intr_mask.pa0 = regk_gio_yes;
886 break;
887 case 1:
888 intr_cfg.pa1 = regk_gio_lo;
889 intr_mask.pa1 = regk_gio_yes;
890 break;
891 case 2:
892 intr_cfg.pa2 = regk_gio_lo;
893 intr_mask.pa2 = regk_gio_yes;
894 break;
895 case 3:
896 intr_cfg.pa3 = regk_gio_lo;
897 intr_mask.pa3 = regk_gio_yes;
898 break;
899 case 4:
900 intr_cfg.pa4 = regk_gio_lo;
901 intr_mask.pa4 = regk_gio_yes;
902 break;
903 case 5:
904 intr_cfg.pa5 = regk_gio_lo;
905 intr_mask.pa5 = regk_gio_yes;
906 break;
907 case 6:
908 intr_cfg.pa6 = regk_gio_lo;
909 intr_mask.pa6 = regk_gio_yes;
910 break;
911 case 7:
912 intr_cfg.pa7 = regk_gio_lo;
913 intr_mask.pa7 = regk_gio_yes;
914 break;
915 }
916
917 REG_WR(gio, regi_gio, rw_intr_cfg, intr_cfg);
918 REG_WR(gio, regi_gio, rw_intr_mask, intr_mask);
919
920 gpio_pa_low_alarms |= (1 << CONFIG_ETRAX_VIRTUAL_GPIO_INTERRUPT_PA_PIN);
921 gpio_some_alarms = 1;
922}
923#endif
924
925/* main driver initialization routine, called from mem.c */
926
927static __init int
928gpio_init(void)
929{
930 int res;
931
932 /* do the formalities */
933
934 res = register_chrdev(GPIO_MAJOR, gpio_name, &gpio_fops);
935 if (res < 0) {
936 printk(KERN_ERR "gpio: couldn't get a major number.\n");
937 return res;
938 }
939
940 /* Clear all leds */
2c30da71
JN		 941 CRIS_LED_NETWORK_GRP0_SET(0);
942 CRIS_LED_NETWORK_GRP1_SET(0);
943 CRIS_LED_ACTIVE_SET(0);
944 CRIS_LED_DISK_READ(0);
945 CRIS_LED_DISK_WRITE(0);
6107c61f
JN		 946
947 printk(KERN_INFO "ETRAX FS GPIO driver v2.5, (c) 2003-2007 "
948 "Axis Communications AB\n");
949 /* We call etrax_gpio_wake_up_check() from timer interrupt and
950 * from cpu_idle() in kernel/process.c
951 * The check in cpu_idle() reduces latency from ~15 ms to ~6 ms
952 * in some tests.
953 */
954 if (request_irq(TIMER0_INTR_VECT, gpio_poll_timer_interrupt,
955 IRQF_SHARED | IRQF_DISABLED, "gpio poll", &alarmlist))
956 printk(KERN_ERR "timer0 irq for gpio\n");
957
958 if (request_irq(GIO_INTR_VECT, gpio_pa_interrupt,
959 IRQF_SHARED | IRQF_DISABLED, "gpio PA", &alarmlist))
960 printk(KERN_ERR "PA irq for gpio\n");
961
962#ifdef CONFIG_ETRAX_VIRTUAL_GPIO
963 virtual_gpio_init();
964#endif
965
966 return res;
967}
968
969/* this makes sure that gpio_init is called during kernel boot */
970
971module_init(gpio_init);
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