2 * Pinmuxed GPIO support for SuperH.
3 * Copy from linux kernel driver/sh/pfc.c
5 * Copyright (C) 2008 Magnus Damm
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
13 #include <asm/bitops.h>
17 static struct pinmux_info *gpioc;
19 #define pfc_phys_to_virt(p, a) ((void *)a)
21 static int enum_in_range(pinmux_enum_t enum_id, struct pinmux_range *r)
23 if (enum_id < r->begin)
32 static unsigned long gpio_read_raw_reg(void *mapped_reg,
33 unsigned long reg_width)
38 return readb(mapped_reg);
40 return readw(mapped_reg);
42 return readl(mapped_reg);
49 static void gpio_write_raw_reg(void *mapped_reg,
50 unsigned long reg_width,
55 writeb(data, mapped_reg);
58 writew(data, mapped_reg);
61 writel(data, mapped_reg);
68 static int gpio_read_bit(struct pinmux_data_reg *dr,
73 pos = dr->reg_width - (in_pos + 1);
75 debug("read_bit: addr = %lx, pos = %ld, "
76 "r_width = %ld\n", dr->reg, pos, dr->reg_width);
79 (gpio_read_raw_reg(dr->mapped_reg + 0x4, dr->reg_width) >> pos) & 1;
82 static void gpio_write_bit(struct pinmux_data_reg *dr,
83 unsigned long in_pos, unsigned long value)
87 pos = dr->reg_width - (in_pos + 1);
89 debug("write_bit addr = %lx, value = %d, pos = %ld, "
91 dr->reg, !!value, pos, dr->reg_width);
94 __set_bit(pos, &dr->reg_shadow);
96 __clear_bit(pos, &dr->reg_shadow);
98 gpio_write_raw_reg(dr->mapped_reg, dr->reg_width, dr->reg_shadow);
101 static void config_reg_helper(struct pinmux_info *gpioc,
102 struct pinmux_cfg_reg *crp,
103 unsigned long in_pos,
105 void __iomem **mapped_regp,
109 unsigned long *maskp,
114 *mapped_regp = pfc_phys_to_virt(gpioc, crp->reg);
116 if (crp->field_width) {
117 *maskp = (1 << crp->field_width) - 1;
118 *posp = crp->reg_width - ((in_pos + 1) * crp->field_width);
120 *maskp = (1 << crp->var_field_width[in_pos]) - 1;
121 *posp = crp->reg_width;
122 for (k = 0; k <= in_pos; k++)
123 *posp -= crp->var_field_width[k];
127 static int read_config_reg(struct pinmux_info *gpioc,
128 struct pinmux_cfg_reg *crp,
133 unsigned long mask, pos;
135 config_reg_helper(gpioc, crp, field, &mapped_reg, &mask, &pos);
137 debug("read_reg: addr = %lx, field = %ld, "
138 "r_width = %ld, f_width = %ld\n",
139 crp->reg, field, crp->reg_width, crp->field_width);
141 return (gpio_read_raw_reg(mapped_reg, crp->reg_width) >> pos) & mask;
144 static void write_config_reg(struct pinmux_info *gpioc,
145 struct pinmux_cfg_reg *crp,
146 unsigned long field, unsigned long value)
149 unsigned long mask, pos, data;
151 config_reg_helper(gpioc, crp, field, &mapped_reg, &mask, &pos);
153 debug("write_reg addr = %lx, value = %ld, field = %ld, "
154 "r_width = %ld, f_width = %ld\n",
155 crp->reg, value, field, crp->reg_width, crp->field_width);
157 mask = ~(mask << pos);
158 value = value << pos;
160 data = gpio_read_raw_reg(mapped_reg, crp->reg_width);
164 if (gpioc->unlock_reg)
165 gpio_write_raw_reg(pfc_phys_to_virt(gpioc, gpioc->unlock_reg),
168 gpio_write_raw_reg(mapped_reg, crp->reg_width, data);
171 static int setup_data_reg(struct pinmux_info *gpioc, unsigned gpio)
173 struct pinmux_gpio *gpiop = &gpioc->gpios[gpio];
174 struct pinmux_data_reg *data_reg;
177 if (!enum_in_range(gpiop->enum_id, &gpioc->data))
182 data_reg = gpioc->data_regs + k;
184 if (!data_reg->reg_width)
187 data_reg->mapped_reg = pfc_phys_to_virt(gpioc, data_reg->reg);
189 for (n = 0; n < data_reg->reg_width; n++) {
190 if (data_reg->enum_ids[n] == gpiop->enum_id) {
191 gpiop->flags &= ~PINMUX_FLAG_DREG;
192 gpiop->flags |= (k << PINMUX_FLAG_DREG_SHIFT);
193 gpiop->flags &= ~PINMUX_FLAG_DBIT;
194 gpiop->flags |= (n << PINMUX_FLAG_DBIT_SHIFT);
206 static void setup_data_regs(struct pinmux_info *gpioc)
208 struct pinmux_data_reg *drp;
211 for (k = gpioc->first_gpio; k <= gpioc->last_gpio; k++)
212 setup_data_reg(gpioc, k);
216 drp = gpioc->data_regs + k;
221 drp->reg_shadow = gpio_read_raw_reg(drp->mapped_reg,
227 static int get_data_reg(struct pinmux_info *gpioc, unsigned gpio,
228 struct pinmux_data_reg **drp, int *bitp)
230 struct pinmux_gpio *gpiop = &gpioc->gpios[gpio];
233 if (!enum_in_range(gpiop->enum_id, &gpioc->data))
236 k = (gpiop->flags & PINMUX_FLAG_DREG) >> PINMUX_FLAG_DREG_SHIFT;
237 n = (gpiop->flags & PINMUX_FLAG_DBIT) >> PINMUX_FLAG_DBIT_SHIFT;
238 *drp = gpioc->data_regs + k;
243 static int get_config_reg(struct pinmux_info *gpioc, pinmux_enum_t enum_id,
244 struct pinmux_cfg_reg **crp,
245 int *fieldp, int *valuep,
246 unsigned long **cntp)
248 struct pinmux_cfg_reg *config_reg;
249 unsigned long r_width, f_width, curr_width, ncomb;
250 int k, m, n, pos, bit_pos;
254 config_reg = gpioc->cfg_regs + k;
256 r_width = config_reg->reg_width;
257 f_width = config_reg->field_width;
264 for (bit_pos = 0; bit_pos < r_width; bit_pos += curr_width) {
266 curr_width = f_width;
268 curr_width = config_reg->var_field_width[m];
270 ncomb = 1 << curr_width;
271 for (n = 0; n < ncomb; n++) {
272 if (config_reg->enum_ids[pos + n] == enum_id) {
276 *cntp = &config_reg->cnt[m];
289 static int get_gpio_enum_id(struct pinmux_info *gpioc, unsigned gpio,
290 int pos, pinmux_enum_t *enum_idp)
292 pinmux_enum_t enum_id = gpioc->gpios[gpio].enum_id;
293 pinmux_enum_t *data = gpioc->gpio_data;
296 if (!enum_in_range(enum_id, &gpioc->data)) {
297 if (!enum_in_range(enum_id, &gpioc->mark)) {
298 debug("non data/mark enum_id for gpio %d\n", gpio);
304 *enum_idp = data[pos + 1];
308 for (k = 0; k < gpioc->gpio_data_size; k++) {
309 if (data[k] == enum_id) {
310 *enum_idp = data[k + 1];
315 debug("cannot locate data/mark enum_id for gpio %d\n", gpio);
319 enum { GPIO_CFG_DRYRUN, GPIO_CFG_REQ, GPIO_CFG_FREE };
321 static int pinmux_config_gpio(struct pinmux_info *gpioc, unsigned gpio,
322 int pinmux_type, int cfg_mode)
324 struct pinmux_cfg_reg *cr = NULL;
325 pinmux_enum_t enum_id;
326 struct pinmux_range *range;
327 int in_range, pos, field, value;
330 switch (pinmux_type) {
332 case PINMUX_TYPE_FUNCTION:
336 case PINMUX_TYPE_OUTPUT:
337 range = &gpioc->output;
340 case PINMUX_TYPE_INPUT:
341 range = &gpioc->input;
344 case PINMUX_TYPE_INPUT_PULLUP:
345 range = &gpioc->input_pu;
348 case PINMUX_TYPE_INPUT_PULLDOWN:
349 range = &gpioc->input_pd;
361 pos = get_gpio_enum_id(gpioc, gpio, pos, &enum_id);
368 /* first check if this is a function enum */
369 in_range = enum_in_range(enum_id, &gpioc->function);
371 /* not a function enum */
374 * other range exists, so this pin is
375 * a regular GPIO pin that now is being
376 * bound to a specific direction.
378 * for this case we only allow function enums
379 * and the enums that match the other range.
381 in_range = enum_in_range(enum_id, range);
384 * special case pass through for fixed
385 * input-only or output-only pins without
386 * function enum register association.
388 if (in_range && enum_id == range->force)
392 * no other range exists, so this pin
393 * must then be of the function type.
395 * allow function type pins to select
396 * any combination of function/in/out
397 * in their MARK lists.
406 if (get_config_reg(gpioc, enum_id, &cr,
407 &field, &value, &cntp) != 0)
411 case GPIO_CFG_DRYRUN:
413 (read_config_reg(gpioc, cr, field) != value))
418 write_config_reg(gpioc, cr, field, value);
434 static DEFINE_SPINLOCK(gpio_lock);
435 static struct pinmux_info *chip_to_pinmux(struct gpio_chip *chip)
437 return container_of(chip, struct pinmux_info, chip);
441 static int sh_gpio_request(unsigned offset)
443 struct pinmux_data_reg *dummy;
444 int i, ret, pinmux_type;
451 if ((gpioc->gpios[offset].flags & PINMUX_FLAG_TYPE) != PINMUX_TYPE_NONE)
454 /* setup pin function here if no data is associated with pin */
456 if (get_data_reg(gpioc, offset, &dummy, &i) != 0)
457 pinmux_type = PINMUX_TYPE_FUNCTION;
459 pinmux_type = PINMUX_TYPE_GPIO;
461 if (pinmux_type == PINMUX_TYPE_FUNCTION) {
462 if (pinmux_config_gpio(gpioc, offset,
464 GPIO_CFG_DRYRUN) != 0)
467 if (pinmux_config_gpio(gpioc, offset,
473 gpioc->gpios[offset].flags &= ~PINMUX_FLAG_TYPE;
474 gpioc->gpios[offset].flags |= pinmux_type;
481 static void sh_gpio_free(unsigned offset)
488 pinmux_type = gpioc->gpios[offset].flags & PINMUX_FLAG_TYPE;
489 pinmux_config_gpio(gpioc, offset, pinmux_type, GPIO_CFG_FREE);
490 gpioc->gpios[offset].flags &= ~PINMUX_FLAG_TYPE;
491 gpioc->gpios[offset].flags |= PINMUX_TYPE_NONE;
494 static int pinmux_direction(struct pinmux_info *gpioc,
495 unsigned gpio, int new_pinmux_type)
503 pinmux_type = gpioc->gpios[gpio].flags & PINMUX_FLAG_TYPE;
505 switch (pinmux_type) {
506 case PINMUX_TYPE_GPIO:
508 case PINMUX_TYPE_OUTPUT:
509 case PINMUX_TYPE_INPUT:
510 case PINMUX_TYPE_INPUT_PULLUP:
511 case PINMUX_TYPE_INPUT_PULLDOWN:
512 pinmux_config_gpio(gpioc, gpio, pinmux_type, GPIO_CFG_FREE);
518 if (pinmux_config_gpio(gpioc, gpio,
520 GPIO_CFG_DRYRUN) != 0)
523 if (pinmux_config_gpio(gpioc, gpio,
528 gpioc->gpios[gpio].flags &= ~PINMUX_FLAG_TYPE;
529 gpioc->gpios[gpio].flags |= new_pinmux_type;
536 static int sh_gpio_direction_input(unsigned offset)
538 return pinmux_direction(gpioc, offset, PINMUX_TYPE_INPUT);
541 static void sh_gpio_set_value(struct pinmux_info *gpioc,
542 unsigned gpio, int value)
544 struct pinmux_data_reg *dr = NULL;
547 if (!gpioc || get_data_reg(gpioc, gpio, &dr, &bit) != 0)
550 gpio_write_bit(dr, bit, value);
553 static int sh_gpio_direction_output(unsigned offset, int value)
555 sh_gpio_set_value(gpioc, offset, value);
556 return pinmux_direction(gpioc, offset, PINMUX_TYPE_OUTPUT);
559 static int sh_gpio_get_value(struct pinmux_info *gpioc, unsigned gpio)
561 struct pinmux_data_reg *dr = NULL;
564 if (!gpioc || get_data_reg(gpioc, gpio, &dr, &bit) != 0)
567 return gpio_read_bit(dr, bit);
570 static int sh_gpio_get(unsigned offset)
572 return sh_gpio_get_value(gpioc, offset);
575 static void sh_gpio_set(unsigned offset, int value)
577 sh_gpio_set_value(gpioc, offset, value);
580 int register_pinmux(struct pinmux_info *pip)
584 debug("%s deregistering\n", pip->name);
585 setup_data_regs(gpioc);
590 int unregister_pinmux(struct pinmux_info *pip)
592 debug("%s deregistering\n", pip->name);
600 int gpio_request(unsigned gpio, const char *label)
602 sh_gpio_request(gpio);
606 int gpio_free(unsigned gpio)
612 int gpio_direction_input(unsigned gpio)
614 return sh_gpio_direction_input(gpio);
617 int gpio_direction_output(unsigned gpio, int value)
619 return sh_gpio_direction_output(gpio, value);
622 void gpio_set_value(unsigned gpio, int value)
624 sh_gpio_set(gpio, value);
627 int gpio_get_value(unsigned gpio)
629 return sh_gpio_get(gpio);