Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux-2.6-block.git] / drivers / pinctrl / qcom / pinctrl-msm.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2013, Sony Mobile Communications AB.
4  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
5  */
6
7 #include <linux/delay.h>
8 #include <linux/err.h>
9 #include <linux/io.h>
10 #include <linux/module.h>
11 #include <linux/of.h>
12 #include <linux/platform_device.h>
13 #include <linux/pinctrl/machine.h>
14 #include <linux/pinctrl/pinctrl.h>
15 #include <linux/pinctrl/pinmux.h>
16 #include <linux/pinctrl/pinconf.h>
17 #include <linux/pinctrl/pinconf-generic.h>
18 #include <linux/slab.h>
19 #include <linux/gpio/driver.h>
20 #include <linux/interrupt.h>
21 #include <linux/spinlock.h>
22 #include <linux/reboot.h>
23 #include <linux/pm.h>
24 #include <linux/log2.h>
25
26 #include "../core.h"
27 #include "../pinconf.h"
28 #include "pinctrl-msm.h"
29 #include "../pinctrl-utils.h"
30
31 #define MAX_NR_GPIO 300
32 #define MAX_NR_TILES 4
33 #define PS_HOLD_OFFSET 0x820
34
35 /**
36  * struct msm_pinctrl - state for a pinctrl-msm device
37  * @dev:            device handle.
38  * @pctrl:          pinctrl handle.
39  * @chip:           gpiochip handle.
40  * @restart_nb:     restart notifier block.
41  * @irq:            parent irq for the TLMM irq_chip.
42  * @lock:           Spinlock to protect register resources as well
43  *                  as msm_pinctrl data structures.
44  * @enabled_irqs:   Bitmap of currently enabled irqs.
45  * @dual_edge_irqs: Bitmap of irqs that need sw emulated dual edge
46  *                  detection.
47  * @soc;            Reference to soc_data of platform specific data.
48  * @regs:           Base addresses for the TLMM tiles.
49  */
50 struct msm_pinctrl {
51         struct device *dev;
52         struct pinctrl_dev *pctrl;
53         struct gpio_chip chip;
54         struct pinctrl_desc desc;
55         struct notifier_block restart_nb;
56
57         struct irq_chip irq_chip;
58         int irq;
59
60         raw_spinlock_t lock;
61
62         DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO);
63         DECLARE_BITMAP(enabled_irqs, MAX_NR_GPIO);
64
65         const struct msm_pinctrl_soc_data *soc;
66         void __iomem *regs[MAX_NR_TILES];
67 };
68
69 #define MSM_ACCESSOR(name) \
70 static u32 msm_readl_##name(struct msm_pinctrl *pctrl, \
71                             const struct msm_pingroup *g) \
72 { \
73         return readl(pctrl->regs[g->tile] + g->name##_reg); \
74 } \
75 static void msm_writel_##name(u32 val, struct msm_pinctrl *pctrl, \
76                               const struct msm_pingroup *g) \
77 { \
78         writel(val, pctrl->regs[g->tile] + g->name##_reg); \
79 }
80
81 MSM_ACCESSOR(ctl)
82 MSM_ACCESSOR(io)
83 MSM_ACCESSOR(intr_cfg)
84 MSM_ACCESSOR(intr_status)
85 MSM_ACCESSOR(intr_target)
86
87 static int msm_get_groups_count(struct pinctrl_dev *pctldev)
88 {
89         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
90
91         return pctrl->soc->ngroups;
92 }
93
94 static const char *msm_get_group_name(struct pinctrl_dev *pctldev,
95                                       unsigned group)
96 {
97         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
98
99         return pctrl->soc->groups[group].name;
100 }
101
102 static int msm_get_group_pins(struct pinctrl_dev *pctldev,
103                               unsigned group,
104                               const unsigned **pins,
105                               unsigned *num_pins)
106 {
107         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
108
109         *pins = pctrl->soc->groups[group].pins;
110         *num_pins = pctrl->soc->groups[group].npins;
111         return 0;
112 }
113
114 static const struct pinctrl_ops msm_pinctrl_ops = {
115         .get_groups_count       = msm_get_groups_count,
116         .get_group_name         = msm_get_group_name,
117         .get_group_pins         = msm_get_group_pins,
118         .dt_node_to_map         = pinconf_generic_dt_node_to_map_group,
119         .dt_free_map            = pinctrl_utils_free_map,
120 };
121
122 static int msm_pinmux_request(struct pinctrl_dev *pctldev, unsigned offset)
123 {
124         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
125         struct gpio_chip *chip = &pctrl->chip;
126
127         return gpiochip_line_is_valid(chip, offset) ? 0 : -EINVAL;
128 }
129
130 static int msm_get_functions_count(struct pinctrl_dev *pctldev)
131 {
132         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
133
134         return pctrl->soc->nfunctions;
135 }
136
137 static const char *msm_get_function_name(struct pinctrl_dev *pctldev,
138                                          unsigned function)
139 {
140         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
141
142         return pctrl->soc->functions[function].name;
143 }
144
145 static int msm_get_function_groups(struct pinctrl_dev *pctldev,
146                                    unsigned function,
147                                    const char * const **groups,
148                                    unsigned * const num_groups)
149 {
150         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
151
152         *groups = pctrl->soc->functions[function].groups;
153         *num_groups = pctrl->soc->functions[function].ngroups;
154         return 0;
155 }
156
157 static int msm_pinmux_set_mux(struct pinctrl_dev *pctldev,
158                               unsigned function,
159                               unsigned group)
160 {
161         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
162         const struct msm_pingroup *g;
163         unsigned long flags;
164         u32 val, mask;
165         int i;
166
167         g = &pctrl->soc->groups[group];
168         mask = GENMASK(g->mux_bit + order_base_2(g->nfuncs) - 1, g->mux_bit);
169
170         for (i = 0; i < g->nfuncs; i++) {
171                 if (g->funcs[i] == function)
172                         break;
173         }
174
175         if (WARN_ON(i == g->nfuncs))
176                 return -EINVAL;
177
178         raw_spin_lock_irqsave(&pctrl->lock, flags);
179
180         val = msm_readl_ctl(pctrl, g);
181         val &= ~mask;
182         val |= i << g->mux_bit;
183         msm_writel_ctl(val, pctrl, g);
184
185         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
186
187         return 0;
188 }
189
190 static int msm_pinmux_request_gpio(struct pinctrl_dev *pctldev,
191                                    struct pinctrl_gpio_range *range,
192                                    unsigned offset)
193 {
194         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
195         const struct msm_pingroup *g = &pctrl->soc->groups[offset];
196
197         /* No funcs? Probably ACPI so can't do anything here */
198         if (!g->nfuncs)
199                 return 0;
200
201         /* For now assume function 0 is GPIO because it always is */
202         return msm_pinmux_set_mux(pctldev, g->funcs[0], offset);
203 }
204
205 static const struct pinmux_ops msm_pinmux_ops = {
206         .request                = msm_pinmux_request,
207         .get_functions_count    = msm_get_functions_count,
208         .get_function_name      = msm_get_function_name,
209         .get_function_groups    = msm_get_function_groups,
210         .gpio_request_enable    = msm_pinmux_request_gpio,
211         .set_mux                = msm_pinmux_set_mux,
212 };
213
214 static int msm_config_reg(struct msm_pinctrl *pctrl,
215                           const struct msm_pingroup *g,
216                           unsigned param,
217                           unsigned *mask,
218                           unsigned *bit)
219 {
220         switch (param) {
221         case PIN_CONFIG_BIAS_DISABLE:
222         case PIN_CONFIG_BIAS_PULL_DOWN:
223         case PIN_CONFIG_BIAS_BUS_HOLD:
224         case PIN_CONFIG_BIAS_PULL_UP:
225                 *bit = g->pull_bit;
226                 *mask = 3;
227                 break;
228         case PIN_CONFIG_DRIVE_STRENGTH:
229                 *bit = g->drv_bit;
230                 *mask = 7;
231                 break;
232         case PIN_CONFIG_OUTPUT:
233         case PIN_CONFIG_INPUT_ENABLE:
234                 *bit = g->oe_bit;
235                 *mask = 1;
236                 break;
237         default:
238                 return -ENOTSUPP;
239         }
240
241         return 0;
242 }
243
244 #define MSM_NO_PULL             0
245 #define MSM_PULL_DOWN           1
246 #define MSM_KEEPER              2
247 #define MSM_PULL_UP_NO_KEEPER   2
248 #define MSM_PULL_UP             3
249
250 static unsigned msm_regval_to_drive(u32 val)
251 {
252         return (val + 1) * 2;
253 }
254
255 static int msm_config_group_get(struct pinctrl_dev *pctldev,
256                                 unsigned int group,
257                                 unsigned long *config)
258 {
259         const struct msm_pingroup *g;
260         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
261         unsigned param = pinconf_to_config_param(*config);
262         unsigned mask;
263         unsigned arg;
264         unsigned bit;
265         int ret;
266         u32 val;
267
268         g = &pctrl->soc->groups[group];
269
270         ret = msm_config_reg(pctrl, g, param, &mask, &bit);
271         if (ret < 0)
272                 return ret;
273
274         val = msm_readl_ctl(pctrl, g);
275         arg = (val >> bit) & mask;
276
277         /* Convert register value to pinconf value */
278         switch (param) {
279         case PIN_CONFIG_BIAS_DISABLE:
280                 if (arg != MSM_NO_PULL)
281                         return -EINVAL;
282                 arg = 1;
283                 break;
284         case PIN_CONFIG_BIAS_PULL_DOWN:
285                 if (arg != MSM_PULL_DOWN)
286                         return -EINVAL;
287                 arg = 1;
288                 break;
289         case PIN_CONFIG_BIAS_BUS_HOLD:
290                 if (pctrl->soc->pull_no_keeper)
291                         return -ENOTSUPP;
292
293                 if (arg != MSM_KEEPER)
294                         return -EINVAL;
295                 arg = 1;
296                 break;
297         case PIN_CONFIG_BIAS_PULL_UP:
298                 if (pctrl->soc->pull_no_keeper)
299                         arg = arg == MSM_PULL_UP_NO_KEEPER;
300                 else
301                         arg = arg == MSM_PULL_UP;
302                 if (!arg)
303                         return -EINVAL;
304                 break;
305         case PIN_CONFIG_DRIVE_STRENGTH:
306                 arg = msm_regval_to_drive(arg);
307                 break;
308         case PIN_CONFIG_OUTPUT:
309                 /* Pin is not output */
310                 if (!arg)
311                         return -EINVAL;
312
313                 val = msm_readl_io(pctrl, g);
314                 arg = !!(val & BIT(g->in_bit));
315                 break;
316         case PIN_CONFIG_INPUT_ENABLE:
317                 /* Pin is output */
318                 if (arg)
319                         return -EINVAL;
320                 arg = 1;
321                 break;
322         default:
323                 return -ENOTSUPP;
324         }
325
326         *config = pinconf_to_config_packed(param, arg);
327
328         return 0;
329 }
330
331 static int msm_config_group_set(struct pinctrl_dev *pctldev,
332                                 unsigned group,
333                                 unsigned long *configs,
334                                 unsigned num_configs)
335 {
336         const struct msm_pingroup *g;
337         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
338         unsigned long flags;
339         unsigned param;
340         unsigned mask;
341         unsigned arg;
342         unsigned bit;
343         int ret;
344         u32 val;
345         int i;
346
347         g = &pctrl->soc->groups[group];
348
349         for (i = 0; i < num_configs; i++) {
350                 param = pinconf_to_config_param(configs[i]);
351                 arg = pinconf_to_config_argument(configs[i]);
352
353                 ret = msm_config_reg(pctrl, g, param, &mask, &bit);
354                 if (ret < 0)
355                         return ret;
356
357                 /* Convert pinconf values to register values */
358                 switch (param) {
359                 case PIN_CONFIG_BIAS_DISABLE:
360                         arg = MSM_NO_PULL;
361                         break;
362                 case PIN_CONFIG_BIAS_PULL_DOWN:
363                         arg = MSM_PULL_DOWN;
364                         break;
365                 case PIN_CONFIG_BIAS_BUS_HOLD:
366                         if (pctrl->soc->pull_no_keeper)
367                                 return -ENOTSUPP;
368
369                         arg = MSM_KEEPER;
370                         break;
371                 case PIN_CONFIG_BIAS_PULL_UP:
372                         if (pctrl->soc->pull_no_keeper)
373                                 arg = MSM_PULL_UP_NO_KEEPER;
374                         else
375                                 arg = MSM_PULL_UP;
376                         break;
377                 case PIN_CONFIG_DRIVE_STRENGTH:
378                         /* Check for invalid values */
379                         if (arg > 16 || arg < 2 || (arg % 2) != 0)
380                                 arg = -1;
381                         else
382                                 arg = (arg / 2) - 1;
383                         break;
384                 case PIN_CONFIG_OUTPUT:
385                         /* set output value */
386                         raw_spin_lock_irqsave(&pctrl->lock, flags);
387                         val = msm_readl_io(pctrl, g);
388                         if (arg)
389                                 val |= BIT(g->out_bit);
390                         else
391                                 val &= ~BIT(g->out_bit);
392                         msm_writel_io(val, pctrl, g);
393                         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
394
395                         /* enable output */
396                         arg = 1;
397                         break;
398                 case PIN_CONFIG_INPUT_ENABLE:
399                         /* disable output */
400                         arg = 0;
401                         break;
402                 default:
403                         dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
404                                 param);
405                         return -EINVAL;
406                 }
407
408                 /* Range-check user-supplied value */
409                 if (arg & ~mask) {
410                         dev_err(pctrl->dev, "config %x: %x is invalid\n", param, arg);
411                         return -EINVAL;
412                 }
413
414                 raw_spin_lock_irqsave(&pctrl->lock, flags);
415                 val = msm_readl_ctl(pctrl, g);
416                 val &= ~(mask << bit);
417                 val |= arg << bit;
418                 msm_writel_ctl(val, pctrl, g);
419                 raw_spin_unlock_irqrestore(&pctrl->lock, flags);
420         }
421
422         return 0;
423 }
424
425 static const struct pinconf_ops msm_pinconf_ops = {
426         .is_generic             = true,
427         .pin_config_group_get   = msm_config_group_get,
428         .pin_config_group_set   = msm_config_group_set,
429 };
430
431 static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
432 {
433         const struct msm_pingroup *g;
434         struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
435         unsigned long flags;
436         u32 val;
437
438         g = &pctrl->soc->groups[offset];
439
440         raw_spin_lock_irqsave(&pctrl->lock, flags);
441
442         val = msm_readl_ctl(pctrl, g);
443         val &= ~BIT(g->oe_bit);
444         msm_writel_ctl(val, pctrl, g);
445
446         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
447
448         return 0;
449 }
450
451 static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value)
452 {
453         const struct msm_pingroup *g;
454         struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
455         unsigned long flags;
456         u32 val;
457
458         g = &pctrl->soc->groups[offset];
459
460         raw_spin_lock_irqsave(&pctrl->lock, flags);
461
462         val = msm_readl_io(pctrl, g);
463         if (value)
464                 val |= BIT(g->out_bit);
465         else
466                 val &= ~BIT(g->out_bit);
467         msm_writel_io(val, pctrl, g);
468
469         val = msm_readl_ctl(pctrl, g);
470         val |= BIT(g->oe_bit);
471         msm_writel_ctl(val, pctrl, g);
472
473         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
474
475         return 0;
476 }
477
478 static int msm_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
479 {
480         struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
481         const struct msm_pingroup *g;
482         u32 val;
483
484         g = &pctrl->soc->groups[offset];
485
486         val = msm_readl_ctl(pctrl, g);
487
488         /* 0 = output, 1 = input */
489         return val & BIT(g->oe_bit) ? 0 : 1;
490 }
491
492 static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
493 {
494         const struct msm_pingroup *g;
495         struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
496         u32 val;
497
498         g = &pctrl->soc->groups[offset];
499
500         val = msm_readl_io(pctrl, g);
501         return !!(val & BIT(g->in_bit));
502 }
503
504 static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
505 {
506         const struct msm_pingroup *g;
507         struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
508         unsigned long flags;
509         u32 val;
510
511         g = &pctrl->soc->groups[offset];
512
513         raw_spin_lock_irqsave(&pctrl->lock, flags);
514
515         val = msm_readl_io(pctrl, g);
516         if (value)
517                 val |= BIT(g->out_bit);
518         else
519                 val &= ~BIT(g->out_bit);
520         msm_writel_io(val, pctrl, g);
521
522         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
523 }
524
525 #ifdef CONFIG_DEBUG_FS
526 #include <linux/seq_file.h>
527
528 static void msm_gpio_dbg_show_one(struct seq_file *s,
529                                   struct pinctrl_dev *pctldev,
530                                   struct gpio_chip *chip,
531                                   unsigned offset,
532                                   unsigned gpio)
533 {
534         const struct msm_pingroup *g;
535         struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
536         unsigned func;
537         int is_out;
538         int drive;
539         int pull;
540         int val;
541         u32 ctl_reg, io_reg;
542
543         static const char * const pulls_keeper[] = {
544                 "no pull",
545                 "pull down",
546                 "keeper",
547                 "pull up"
548         };
549
550         static const char * const pulls_no_keeper[] = {
551                 "no pull",
552                 "pull down",
553                 "pull up",
554         };
555
556         if (!gpiochip_line_is_valid(chip, offset))
557                 return;
558
559         g = &pctrl->soc->groups[offset];
560         ctl_reg = msm_readl_ctl(pctrl, g);
561         io_reg = msm_readl_io(pctrl, g);
562
563         is_out = !!(ctl_reg & BIT(g->oe_bit));
564         func = (ctl_reg >> g->mux_bit) & 7;
565         drive = (ctl_reg >> g->drv_bit) & 7;
566         pull = (ctl_reg >> g->pull_bit) & 3;
567
568         if (is_out)
569                 val = !!(io_reg & BIT(g->out_bit));
570         else
571                 val = !!(io_reg & BIT(g->in_bit));
572
573         seq_printf(s, " %-8s: %-3s", g->name, is_out ? "out" : "in");
574         seq_printf(s, " %-4s func%d", val ? "high" : "low", func);
575         seq_printf(s, " %dmA", msm_regval_to_drive(drive));
576         if (pctrl->soc->pull_no_keeper)
577                 seq_printf(s, " %s", pulls_no_keeper[pull]);
578         else
579                 seq_printf(s, " %s", pulls_keeper[pull]);
580         seq_puts(s, "\n");
581 }
582
583 static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
584 {
585         unsigned gpio = chip->base;
586         unsigned i;
587
588         for (i = 0; i < chip->ngpio; i++, gpio++)
589                 msm_gpio_dbg_show_one(s, NULL, chip, i, gpio);
590 }
591
592 #else
593 #define msm_gpio_dbg_show NULL
594 #endif
595
596 static int msm_gpio_init_valid_mask(struct gpio_chip *gc,
597                                     unsigned long *valid_mask,
598                                     unsigned int ngpios)
599 {
600         struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
601         int ret;
602         unsigned int len, i;
603         const int *reserved = pctrl->soc->reserved_gpios;
604         u16 *tmp;
605
606         /* Driver provided reserved list overrides DT and ACPI */
607         if (reserved) {
608                 bitmap_fill(valid_mask, ngpios);
609                 for (i = 0; reserved[i] >= 0; i++) {
610                         if (i >= ngpios || reserved[i] >= ngpios) {
611                                 dev_err(pctrl->dev, "invalid list of reserved GPIOs\n");
612                                 return -EINVAL;
613                         }
614                         clear_bit(reserved[i], valid_mask);
615                 }
616
617                 return 0;
618         }
619
620         /* The number of GPIOs in the ACPI tables */
621         len = ret = device_property_read_u16_array(pctrl->dev, "gpios", NULL,
622                                                    0);
623         if (ret < 0)
624                 return 0;
625
626         if (ret > ngpios)
627                 return -EINVAL;
628
629         tmp = kmalloc_array(len, sizeof(*tmp), GFP_KERNEL);
630         if (!tmp)
631                 return -ENOMEM;
632
633         ret = device_property_read_u16_array(pctrl->dev, "gpios", tmp, len);
634         if (ret < 0) {
635                 dev_err(pctrl->dev, "could not read list of GPIOs\n");
636                 goto out;
637         }
638
639         bitmap_zero(valid_mask, ngpios);
640         for (i = 0; i < len; i++)
641                 set_bit(tmp[i], valid_mask);
642
643 out:
644         kfree(tmp);
645         return ret;
646 }
647
648 static const struct gpio_chip msm_gpio_template = {
649         .direction_input  = msm_gpio_direction_input,
650         .direction_output = msm_gpio_direction_output,
651         .get_direction    = msm_gpio_get_direction,
652         .get              = msm_gpio_get,
653         .set              = msm_gpio_set,
654         .request          = gpiochip_generic_request,
655         .free             = gpiochip_generic_free,
656         .dbg_show         = msm_gpio_dbg_show,
657 };
658
659 /* For dual-edge interrupts in software, since some hardware has no
660  * such support:
661  *
662  * At appropriate moments, this function may be called to flip the polarity
663  * settings of both-edge irq lines to try and catch the next edge.
664  *
665  * The attempt is considered successful if:
666  * - the status bit goes high, indicating that an edge was caught, or
667  * - the input value of the gpio doesn't change during the attempt.
668  * If the value changes twice during the process, that would cause the first
669  * test to fail but would force the second, as two opposite
670  * transitions would cause a detection no matter the polarity setting.
671  *
672  * The do-loop tries to sledge-hammer closed the timing hole between
673  * the initial value-read and the polarity-write - if the line value changes
674  * during that window, an interrupt is lost, the new polarity setting is
675  * incorrect, and the first success test will fail, causing a retry.
676  *
677  * Algorithm comes from Google's msmgpio driver.
678  */
679 static void msm_gpio_update_dual_edge_pos(struct msm_pinctrl *pctrl,
680                                           const struct msm_pingroup *g,
681                                           struct irq_data *d)
682 {
683         int loop_limit = 100;
684         unsigned val, val2, intstat;
685         unsigned pol;
686
687         do {
688                 val = msm_readl_io(pctrl, g) & BIT(g->in_bit);
689
690                 pol = msm_readl_intr_cfg(pctrl, g);
691                 pol ^= BIT(g->intr_polarity_bit);
692                 msm_writel_intr_cfg(val, pctrl, g);
693
694                 val2 = msm_readl_io(pctrl, g) & BIT(g->in_bit);
695                 intstat = msm_readl_intr_status(pctrl, g);
696                 if (intstat || (val == val2))
697                         return;
698         } while (loop_limit-- > 0);
699         dev_err(pctrl->dev, "dual-edge irq failed to stabilize, %#08x != %#08x\n",
700                 val, val2);
701 }
702
703 static void msm_gpio_irq_mask(struct irq_data *d)
704 {
705         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
706         struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
707         const struct msm_pingroup *g;
708         unsigned long flags;
709         u32 val;
710
711         g = &pctrl->soc->groups[d->hwirq];
712
713         raw_spin_lock_irqsave(&pctrl->lock, flags);
714
715         val = msm_readl_intr_cfg(pctrl, g);
716         /*
717          * There are two bits that control interrupt forwarding to the CPU. The
718          * RAW_STATUS_EN bit causes the level or edge sensed on the line to be
719          * latched into the interrupt status register when the hardware detects
720          * an irq that it's configured for (either edge for edge type or level
721          * for level type irq). The 'non-raw' status enable bit causes the
722          * hardware to assert the summary interrupt to the CPU if the latched
723          * status bit is set. There's a bug though, the edge detection logic
724          * seems to have a problem where toggling the RAW_STATUS_EN bit may
725          * cause the status bit to latch spuriously when there isn't any edge
726          * so we can't touch that bit for edge type irqs and we have to keep
727          * the bit set anyway so that edges are latched while the line is masked.
728          *
729          * To make matters more complicated, leaving the RAW_STATUS_EN bit
730          * enabled all the time causes level interrupts to re-latch into the
731          * status register because the level is still present on the line after
732          * we ack it. We clear the raw status enable bit during mask here and
733          * set the bit on unmask so the interrupt can't latch into the hardware
734          * while it's masked.
735          */
736         if (irqd_get_trigger_type(d) & IRQ_TYPE_LEVEL_MASK)
737                 val &= ~BIT(g->intr_raw_status_bit);
738
739         val &= ~BIT(g->intr_enable_bit);
740         msm_writel_intr_cfg(val, pctrl, g);
741
742         clear_bit(d->hwirq, pctrl->enabled_irqs);
743
744         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
745 }
746
747 static void msm_gpio_irq_clear_unmask(struct irq_data *d, bool status_clear)
748 {
749         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
750         struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
751         const struct msm_pingroup *g;
752         unsigned long flags;
753         u32 val;
754
755         g = &pctrl->soc->groups[d->hwirq];
756
757         raw_spin_lock_irqsave(&pctrl->lock, flags);
758
759         if (status_clear) {
760                 /*
761                  * clear the interrupt status bit before unmask to avoid
762                  * any erroneous interrupts that would have got latched
763                  * when the interrupt is not in use.
764                  */
765                 val = msm_readl_intr_status(pctrl, g);
766                 val &= ~BIT(g->intr_status_bit);
767                 msm_writel_intr_status(val, pctrl, g);
768         }
769
770         val = msm_readl_intr_cfg(pctrl, g);
771         val |= BIT(g->intr_raw_status_bit);
772         val |= BIT(g->intr_enable_bit);
773         msm_writel_intr_cfg(val, pctrl, g);
774
775         set_bit(d->hwirq, pctrl->enabled_irqs);
776
777         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
778 }
779
780 static void msm_gpio_irq_enable(struct irq_data *d)
781 {
782
783         msm_gpio_irq_clear_unmask(d, true);
784 }
785
786 static void msm_gpio_irq_unmask(struct irq_data *d)
787 {
788         msm_gpio_irq_clear_unmask(d, false);
789 }
790
791 static void msm_gpio_irq_ack(struct irq_data *d)
792 {
793         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
794         struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
795         const struct msm_pingroup *g;
796         unsigned long flags;
797         u32 val;
798
799         g = &pctrl->soc->groups[d->hwirq];
800
801         raw_spin_lock_irqsave(&pctrl->lock, flags);
802
803         val = msm_readl_intr_status(pctrl, g);
804         if (g->intr_ack_high)
805                 val |= BIT(g->intr_status_bit);
806         else
807                 val &= ~BIT(g->intr_status_bit);
808         msm_writel_intr_status(val, pctrl, g);
809
810         if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
811                 msm_gpio_update_dual_edge_pos(pctrl, g, d);
812
813         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
814 }
815
816 static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
817 {
818         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
819         struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
820         const struct msm_pingroup *g;
821         unsigned long flags;
822         u32 val;
823
824         g = &pctrl->soc->groups[d->hwirq];
825
826         raw_spin_lock_irqsave(&pctrl->lock, flags);
827
828         /*
829          * For hw without possibility of detecting both edges
830          */
831         if (g->intr_detection_width == 1 && type == IRQ_TYPE_EDGE_BOTH)
832                 set_bit(d->hwirq, pctrl->dual_edge_irqs);
833         else
834                 clear_bit(d->hwirq, pctrl->dual_edge_irqs);
835
836         /* Route interrupts to application cpu */
837         val = msm_readl_intr_target(pctrl, g);
838         val &= ~(7 << g->intr_target_bit);
839         val |= g->intr_target_kpss_val << g->intr_target_bit;
840         msm_writel_intr_target(val, pctrl, g);
841
842         /* Update configuration for gpio.
843          * RAW_STATUS_EN is left on for all gpio irqs. Due to the
844          * internal circuitry of TLMM, toggling the RAW_STATUS
845          * could cause the INTR_STATUS to be set for EDGE interrupts.
846          */
847         val = msm_readl_intr_cfg(pctrl, g);
848         val |= BIT(g->intr_raw_status_bit);
849         if (g->intr_detection_width == 2) {
850                 val &= ~(3 << g->intr_detection_bit);
851                 val &= ~(1 << g->intr_polarity_bit);
852                 switch (type) {
853                 case IRQ_TYPE_EDGE_RISING:
854                         val |= 1 << g->intr_detection_bit;
855                         val |= BIT(g->intr_polarity_bit);
856                         break;
857                 case IRQ_TYPE_EDGE_FALLING:
858                         val |= 2 << g->intr_detection_bit;
859                         val |= BIT(g->intr_polarity_bit);
860                         break;
861                 case IRQ_TYPE_EDGE_BOTH:
862                         val |= 3 << g->intr_detection_bit;
863                         val |= BIT(g->intr_polarity_bit);
864                         break;
865                 case IRQ_TYPE_LEVEL_LOW:
866                         break;
867                 case IRQ_TYPE_LEVEL_HIGH:
868                         val |= BIT(g->intr_polarity_bit);
869                         break;
870                 }
871         } else if (g->intr_detection_width == 1) {
872                 val &= ~(1 << g->intr_detection_bit);
873                 val &= ~(1 << g->intr_polarity_bit);
874                 switch (type) {
875                 case IRQ_TYPE_EDGE_RISING:
876                         val |= BIT(g->intr_detection_bit);
877                         val |= BIT(g->intr_polarity_bit);
878                         break;
879                 case IRQ_TYPE_EDGE_FALLING:
880                         val |= BIT(g->intr_detection_bit);
881                         break;
882                 case IRQ_TYPE_EDGE_BOTH:
883                         val |= BIT(g->intr_detection_bit);
884                         val |= BIT(g->intr_polarity_bit);
885                         break;
886                 case IRQ_TYPE_LEVEL_LOW:
887                         break;
888                 case IRQ_TYPE_LEVEL_HIGH:
889                         val |= BIT(g->intr_polarity_bit);
890                         break;
891                 }
892         } else {
893                 BUG();
894         }
895         msm_writel_intr_cfg(val, pctrl, g);
896
897         if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
898                 msm_gpio_update_dual_edge_pos(pctrl, g, d);
899
900         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
901
902         if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
903                 irq_set_handler_locked(d, handle_level_irq);
904         else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
905                 irq_set_handler_locked(d, handle_edge_irq);
906
907         return 0;
908 }
909
910 static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
911 {
912         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
913         struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
914         unsigned long flags;
915
916         raw_spin_lock_irqsave(&pctrl->lock, flags);
917
918         irq_set_irq_wake(pctrl->irq, on);
919
920         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
921
922         return 0;
923 }
924
925 static int msm_gpio_irq_reqres(struct irq_data *d)
926 {
927         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
928         struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
929         int ret;
930
931         if (!try_module_get(gc->owner))
932                 return -ENODEV;
933
934         ret = msm_pinmux_request_gpio(pctrl->pctrl, NULL, d->hwirq);
935         if (ret)
936                 goto out;
937         msm_gpio_direction_input(gc, d->hwirq);
938
939         if (gpiochip_lock_as_irq(gc, d->hwirq)) {
940                 dev_err(gc->parent,
941                         "unable to lock HW IRQ %lu for IRQ\n",
942                         d->hwirq);
943                 ret = -EINVAL;
944                 goto out;
945         }
946         return 0;
947 out:
948         module_put(gc->owner);
949         return ret;
950 }
951
952 static void msm_gpio_irq_relres(struct irq_data *d)
953 {
954         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
955
956         gpiochip_unlock_as_irq(gc, d->hwirq);
957         module_put(gc->owner);
958 }
959
960 static void msm_gpio_irq_handler(struct irq_desc *desc)
961 {
962         struct gpio_chip *gc = irq_desc_get_handler_data(desc);
963         const struct msm_pingroup *g;
964         struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
965         struct irq_chip *chip = irq_desc_get_chip(desc);
966         int irq_pin;
967         int handled = 0;
968         u32 val;
969         int i;
970
971         chained_irq_enter(chip, desc);
972
973         /*
974          * Each pin has it's own IRQ status register, so use
975          * enabled_irq bitmap to limit the number of reads.
976          */
977         for_each_set_bit(i, pctrl->enabled_irqs, pctrl->chip.ngpio) {
978                 g = &pctrl->soc->groups[i];
979                 val = msm_readl_intr_status(pctrl, g);
980                 if (val & BIT(g->intr_status_bit)) {
981                         irq_pin = irq_find_mapping(gc->irq.domain, i);
982                         generic_handle_irq(irq_pin);
983                         handled++;
984                 }
985         }
986
987         /* No interrupts were flagged */
988         if (handled == 0)
989                 handle_bad_irq(desc);
990
991         chained_irq_exit(chip, desc);
992 }
993
994 static bool msm_gpio_needs_valid_mask(struct msm_pinctrl *pctrl)
995 {
996         if (pctrl->soc->reserved_gpios)
997                 return true;
998
999         return device_property_read_u16_array(pctrl->dev, "gpios", NULL, 0) > 0;
1000 }
1001
1002 static int msm_gpio_init(struct msm_pinctrl *pctrl)
1003 {
1004         struct gpio_chip *chip;
1005         int ret;
1006         unsigned ngpio = pctrl->soc->ngpios;
1007
1008         if (WARN_ON(ngpio > MAX_NR_GPIO))
1009                 return -EINVAL;
1010
1011         chip = &pctrl->chip;
1012         chip->base = -1;
1013         chip->ngpio = ngpio;
1014         chip->label = dev_name(pctrl->dev);
1015         chip->parent = pctrl->dev;
1016         chip->owner = THIS_MODULE;
1017         chip->of_node = pctrl->dev->of_node;
1018         if (msm_gpio_needs_valid_mask(pctrl))
1019                 chip->init_valid_mask = msm_gpio_init_valid_mask;
1020
1021         pctrl->irq_chip.name = "msmgpio";
1022         pctrl->irq_chip.irq_enable = msm_gpio_irq_enable;
1023         pctrl->irq_chip.irq_mask = msm_gpio_irq_mask;
1024         pctrl->irq_chip.irq_unmask = msm_gpio_irq_unmask;
1025         pctrl->irq_chip.irq_ack = msm_gpio_irq_ack;
1026         pctrl->irq_chip.irq_set_type = msm_gpio_irq_set_type;
1027         pctrl->irq_chip.irq_set_wake = msm_gpio_irq_set_wake;
1028         pctrl->irq_chip.irq_request_resources = msm_gpio_irq_reqres;
1029         pctrl->irq_chip.irq_release_resources = msm_gpio_irq_relres;
1030
1031         ret = gpiochip_add_data(&pctrl->chip, pctrl);
1032         if (ret) {
1033                 dev_err(pctrl->dev, "Failed register gpiochip\n");
1034                 return ret;
1035         }
1036
1037         /*
1038          * For DeviceTree-supported systems, the gpio core checks the
1039          * pinctrl's device node for the "gpio-ranges" property.
1040          * If it is present, it takes care of adding the pin ranges
1041          * for the driver. In this case the driver can skip ahead.
1042          *
1043          * In order to remain compatible with older, existing DeviceTree
1044          * files which don't set the "gpio-ranges" property or systems that
1045          * utilize ACPI the driver has to call gpiochip_add_pin_range().
1046          */
1047         if (!of_property_read_bool(pctrl->dev->of_node, "gpio-ranges")) {
1048                 ret = gpiochip_add_pin_range(&pctrl->chip,
1049                         dev_name(pctrl->dev), 0, 0, chip->ngpio);
1050                 if (ret) {
1051                         dev_err(pctrl->dev, "Failed to add pin range\n");
1052                         gpiochip_remove(&pctrl->chip);
1053                         return ret;
1054                 }
1055         }
1056
1057         ret = gpiochip_irqchip_add(chip,
1058                                    &pctrl->irq_chip,
1059                                    0,
1060                                    handle_edge_irq,
1061                                    IRQ_TYPE_NONE);
1062         if (ret) {
1063                 dev_err(pctrl->dev, "Failed to add irqchip to gpiochip\n");
1064                 gpiochip_remove(&pctrl->chip);
1065                 return -ENOSYS;
1066         }
1067
1068         gpiochip_set_chained_irqchip(chip, &pctrl->irq_chip, pctrl->irq,
1069                                      msm_gpio_irq_handler);
1070
1071         return 0;
1072 }
1073
1074 static int msm_ps_hold_restart(struct notifier_block *nb, unsigned long action,
1075                                void *data)
1076 {
1077         struct msm_pinctrl *pctrl = container_of(nb, struct msm_pinctrl, restart_nb);
1078
1079         writel(0, pctrl->regs[0] + PS_HOLD_OFFSET);
1080         mdelay(1000);
1081         return NOTIFY_DONE;
1082 }
1083
1084 static struct msm_pinctrl *poweroff_pctrl;
1085
1086 static void msm_ps_hold_poweroff(void)
1087 {
1088         msm_ps_hold_restart(&poweroff_pctrl->restart_nb, 0, NULL);
1089 }
1090
1091 static void msm_pinctrl_setup_pm_reset(struct msm_pinctrl *pctrl)
1092 {
1093         int i;
1094         const struct msm_function *func = pctrl->soc->functions;
1095
1096         for (i = 0; i < pctrl->soc->nfunctions; i++)
1097                 if (!strcmp(func[i].name, "ps_hold")) {
1098                         pctrl->restart_nb.notifier_call = msm_ps_hold_restart;
1099                         pctrl->restart_nb.priority = 128;
1100                         if (register_restart_handler(&pctrl->restart_nb))
1101                                 dev_err(pctrl->dev,
1102                                         "failed to setup restart handler.\n");
1103                         poweroff_pctrl = pctrl;
1104                         pm_power_off = msm_ps_hold_poweroff;
1105                         break;
1106                 }
1107 }
1108
1109 static __maybe_unused int msm_pinctrl_suspend(struct device *dev)
1110 {
1111         struct msm_pinctrl *pctrl = dev_get_drvdata(dev);
1112
1113         return pinctrl_force_sleep(pctrl->pctrl);
1114 }
1115
1116 static __maybe_unused int msm_pinctrl_resume(struct device *dev)
1117 {
1118         struct msm_pinctrl *pctrl = dev_get_drvdata(dev);
1119
1120         return pinctrl_force_default(pctrl->pctrl);
1121 }
1122
1123 SIMPLE_DEV_PM_OPS(msm_pinctrl_dev_pm_ops, msm_pinctrl_suspend,
1124                   msm_pinctrl_resume);
1125
1126 EXPORT_SYMBOL(msm_pinctrl_dev_pm_ops);
1127
1128 int msm_pinctrl_probe(struct platform_device *pdev,
1129                       const struct msm_pinctrl_soc_data *soc_data)
1130 {
1131         struct msm_pinctrl *pctrl;
1132         struct resource *res;
1133         int ret;
1134         int i;
1135
1136         pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
1137         if (!pctrl)
1138                 return -ENOMEM;
1139
1140         pctrl->dev = &pdev->dev;
1141         pctrl->soc = soc_data;
1142         pctrl->chip = msm_gpio_template;
1143
1144         raw_spin_lock_init(&pctrl->lock);
1145
1146         if (soc_data->tiles) {
1147                 for (i = 0; i < soc_data->ntiles; i++) {
1148                         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
1149                                                            soc_data->tiles[i]);
1150                         pctrl->regs[i] = devm_ioremap_resource(&pdev->dev, res);
1151                         if (IS_ERR(pctrl->regs[i]))
1152                                 return PTR_ERR(pctrl->regs[i]);
1153                 }
1154         } else {
1155                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1156                 pctrl->regs[0] = devm_ioremap_resource(&pdev->dev, res);
1157                 if (IS_ERR(pctrl->regs[0]))
1158                         return PTR_ERR(pctrl->regs[0]);
1159         }
1160
1161         msm_pinctrl_setup_pm_reset(pctrl);
1162
1163         pctrl->irq = platform_get_irq(pdev, 0);
1164         if (pctrl->irq < 0) {
1165                 dev_err(&pdev->dev, "No interrupt defined for msmgpio\n");
1166                 return pctrl->irq;
1167         }
1168
1169         pctrl->desc.owner = THIS_MODULE;
1170         pctrl->desc.pctlops = &msm_pinctrl_ops;
1171         pctrl->desc.pmxops = &msm_pinmux_ops;
1172         pctrl->desc.confops = &msm_pinconf_ops;
1173         pctrl->desc.name = dev_name(&pdev->dev);
1174         pctrl->desc.pins = pctrl->soc->pins;
1175         pctrl->desc.npins = pctrl->soc->npins;
1176
1177         pctrl->pctrl = devm_pinctrl_register(&pdev->dev, &pctrl->desc, pctrl);
1178         if (IS_ERR(pctrl->pctrl)) {
1179                 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
1180                 return PTR_ERR(pctrl->pctrl);
1181         }
1182
1183         ret = msm_gpio_init(pctrl);
1184         if (ret)
1185                 return ret;
1186
1187         platform_set_drvdata(pdev, pctrl);
1188
1189         dev_dbg(&pdev->dev, "Probed Qualcomm pinctrl driver\n");
1190
1191         return 0;
1192 }
1193 EXPORT_SYMBOL(msm_pinctrl_probe);
1194
1195 int msm_pinctrl_remove(struct platform_device *pdev)
1196 {
1197         struct msm_pinctrl *pctrl = platform_get_drvdata(pdev);
1198
1199         gpiochip_remove(&pctrl->chip);
1200
1201         unregister_restart_handler(&pctrl->restart_nb);
1202
1203         return 0;
1204 }
1205 EXPORT_SYMBOL(msm_pinctrl_remove);
1206