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[linux/fpc-iii.git] / drivers / pinctrl / pinctrl-rzn1.c
blobcc0e5aa9128a141711582493e0d4d582851540f7
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2014-2018 Renesas Electronics Europe Limited
4 *
5 * Phil Edworthy <phil.edworthy@renesas.com>
6 * Based on a driver originally written by Michel Pollet at Renesas.
7 */
8
9 #include <dt-bindings/pinctrl/rzn1-pinctrl.h>
10 #include <linux/clk.h>
11 #include <linux/device.h>
12 #include <linux/io.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/pinctrl/pinconf-generic.h>
16 #include <linux/pinctrl/pinctrl.h>
17 #include <linux/pinctrl/pinmux.h>
18 #include <linux/platform_device.h>
19 #include <linux/slab.h>
20 #include "core.h"
21 #include "pinconf.h"
22 #include "pinctrl-utils.h"
23
24 /* Field positions and masks in the pinmux registers */
25 #define RZN1_L1_PIN_DRIVE_STRENGTH 10
26 #define RZN1_L1_PIN_DRIVE_STRENGTH_4MA 0
27 #define RZN1_L1_PIN_DRIVE_STRENGTH_6MA 1
28 #define RZN1_L1_PIN_DRIVE_STRENGTH_8MA 2
29 #define RZN1_L1_PIN_DRIVE_STRENGTH_12MA 3
30 #define RZN1_L1_PIN_PULL 8
31 #define RZN1_L1_PIN_PULL_NONE 0
32 #define RZN1_L1_PIN_PULL_UP 1
33 #define RZN1_L1_PIN_PULL_DOWN 3
34 #define RZN1_L1_FUNCTION 0
35 #define RZN1_L1_FUNC_MASK 0xf
36 #define RZN1_L1_FUNCTION_L2 0xf
37
38 /*
39 * The hardware manual describes two levels of multiplexing, but it's more
40 * logical to think of the hardware as three levels, with level 3 consisting of
41 * the multiplexing for Ethernet MDIO signals.
42 *
43 * Level 1 functions go from 0 to 9, with level 1 function '15' (0xf) specifying
44 * that level 2 functions are used instead. Level 2 has a lot more options,
45 * going from 0 to 61. Level 3 allows selection of MDIO functions which can be
46 * floating, or one of seven internal peripherals. Unfortunately, there are two
47 * level 2 functions that can select MDIO, and two MDIO channels so we have four
48 * sets of level 3 functions.
49 *
50 * For this driver, we've compounded the numbers together, so:
51 * 0 to 9 is level 1
52 * 10 to 71 is 10 + level 2 number
53 * 72 to 79 is 72 + MDIO0 source for level 2 MDIO function.
54 * 80 to 87 is 80 + MDIO0 source for level 2 MDIO_E1 function.
55 * 88 to 95 is 88 + MDIO1 source for level 2 MDIO function.
56 * 96 to 103 is 96 + MDIO1 source for level 2 MDIO_E1 function.
57 * Examples:
58 * Function 28 corresponds UART0
59 * Function 73 corresponds to MDIO0 to GMAC0
60 *
61 * There are 170 configurable pins (called PL_GPIO in the datasheet).
62 */
63
64 /*
65 * Structure detailing the HW registers on the RZ/N1 devices.
66 * Both the Level 1 mux registers and Level 2 mux registers have the same
67 * structure. The only difference is that Level 2 has additional MDIO registers
68 * at the end.
69 */
70 struct rzn1_pinctrl_regs {
71 u32 conf[170];
72 u32 pad0[86];
73 u32 status_protect; /* 0x400 */
74 /* MDIO mux registers, level2 only */
75 u32 l2_mdio[2];
76 };
77
78 /**
79 * struct rzn1_pmx_func - describes rzn1 pinmux functions
80 * @name: the name of this specific function
81 * @groups: corresponding pin groups
82 * @num_groups: the number of groups
83 */
84 struct rzn1_pmx_func {
85 const char *name;
86 const char **groups;
87 unsigned int num_groups;
88 };
89
90 /**
91 * struct rzn1_pin_group - describes an rzn1 pin group
92 * @name: the name of this specific pin group
93 * @func: the name of the function selected by this group
94 * @npins: the number of pins in this group array, i.e. the number of
95 * elements in .pins so we can iterate over that array
96 * @pins: array of pins. Needed due to pinctrl_ops.get_group_pins()
97 * @pin_ids: array of pin_ids, i.e. the value used to select the mux
98 */
99 struct rzn1_pin_group {
100 const char *name;
101 const char *func;
102 unsigned int npins;
103 unsigned int *pins;
104 u8 *pin_ids;
105 };
106
107 struct rzn1_pinctrl {
108 struct device *dev;
109 struct clk *clk;
110 struct pinctrl_dev *pctl;
111 struct rzn1_pinctrl_regs __iomem *lev1;
112 struct rzn1_pinctrl_regs __iomem *lev2;
113 u32 lev1_protect_phys;
114 u32 lev2_protect_phys;
115 int mdio_func[2];
116
117 struct rzn1_pin_group *groups;
118 unsigned int ngroups;
119
120 struct rzn1_pmx_func *functions;
121 unsigned int nfunctions;
122 };
123
124 #define RZN1_PINS_PROP "pinmux"
125
126 #define RZN1_PIN(pin) PINCTRL_PIN(pin, "pl_gpio"#pin)
127
128 static const struct pinctrl_pin_desc rzn1_pins[] = {
129 RZN1_PIN(0), RZN1_PIN(1), RZN1_PIN(2), RZN1_PIN(3), RZN1_PIN(4),
130 RZN1_PIN(5), RZN1_PIN(6), RZN1_PIN(7), RZN1_PIN(8), RZN1_PIN(9),
131 RZN1_PIN(10), RZN1_PIN(11), RZN1_PIN(12), RZN1_PIN(13), RZN1_PIN(14),
132 RZN1_PIN(15), RZN1_PIN(16), RZN1_PIN(17), RZN1_PIN(18), RZN1_PIN(19),
133 RZN1_PIN(20), RZN1_PIN(21), RZN1_PIN(22), RZN1_PIN(23), RZN1_PIN(24),
134 RZN1_PIN(25), RZN1_PIN(26), RZN1_PIN(27), RZN1_PIN(28), RZN1_PIN(29),
135 RZN1_PIN(30), RZN1_PIN(31), RZN1_PIN(32), RZN1_PIN(33), RZN1_PIN(34),
136 RZN1_PIN(35), RZN1_PIN(36), RZN1_PIN(37), RZN1_PIN(38), RZN1_PIN(39),
137 RZN1_PIN(40), RZN1_PIN(41), RZN1_PIN(42), RZN1_PIN(43), RZN1_PIN(44),
138 RZN1_PIN(45), RZN1_PIN(46), RZN1_PIN(47), RZN1_PIN(48), RZN1_PIN(49),
139 RZN1_PIN(50), RZN1_PIN(51), RZN1_PIN(52), RZN1_PIN(53), RZN1_PIN(54),
140 RZN1_PIN(55), RZN1_PIN(56), RZN1_PIN(57), RZN1_PIN(58), RZN1_PIN(59),
141 RZN1_PIN(60), RZN1_PIN(61), RZN1_PIN(62), RZN1_PIN(63), RZN1_PIN(64),
142 RZN1_PIN(65), RZN1_PIN(66), RZN1_PIN(67), RZN1_PIN(68), RZN1_PIN(69),
143 RZN1_PIN(70), RZN1_PIN(71), RZN1_PIN(72), RZN1_PIN(73), RZN1_PIN(74),
144 RZN1_PIN(75), RZN1_PIN(76), RZN1_PIN(77), RZN1_PIN(78), RZN1_PIN(79),
145 RZN1_PIN(80), RZN1_PIN(81), RZN1_PIN(82), RZN1_PIN(83), RZN1_PIN(84),
146 RZN1_PIN(85), RZN1_PIN(86), RZN1_PIN(87), RZN1_PIN(88), RZN1_PIN(89),
147 RZN1_PIN(90), RZN1_PIN(91), RZN1_PIN(92), RZN1_PIN(93), RZN1_PIN(94),
148 RZN1_PIN(95), RZN1_PIN(96), RZN1_PIN(97), RZN1_PIN(98), RZN1_PIN(99),
149 RZN1_PIN(100), RZN1_PIN(101), RZN1_PIN(102), RZN1_PIN(103),
150 RZN1_PIN(104), RZN1_PIN(105), RZN1_PIN(106), RZN1_PIN(107),
151 RZN1_PIN(108), RZN1_PIN(109), RZN1_PIN(110), RZN1_PIN(111),
152 RZN1_PIN(112), RZN1_PIN(113), RZN1_PIN(114), RZN1_PIN(115),
153 RZN1_PIN(116), RZN1_PIN(117), RZN1_PIN(118), RZN1_PIN(119),
154 RZN1_PIN(120), RZN1_PIN(121), RZN1_PIN(122), RZN1_PIN(123),
155 RZN1_PIN(124), RZN1_PIN(125), RZN1_PIN(126), RZN1_PIN(127),
156 RZN1_PIN(128), RZN1_PIN(129), RZN1_PIN(130), RZN1_PIN(131),
157 RZN1_PIN(132), RZN1_PIN(133), RZN1_PIN(134), RZN1_PIN(135),
158 RZN1_PIN(136), RZN1_PIN(137), RZN1_PIN(138), RZN1_PIN(139),
159 RZN1_PIN(140), RZN1_PIN(141), RZN1_PIN(142), RZN1_PIN(143),
160 RZN1_PIN(144), RZN1_PIN(145), RZN1_PIN(146), RZN1_PIN(147),
161 RZN1_PIN(148), RZN1_PIN(149), RZN1_PIN(150), RZN1_PIN(151),
162 RZN1_PIN(152), RZN1_PIN(153), RZN1_PIN(154), RZN1_PIN(155),
163 RZN1_PIN(156), RZN1_PIN(157), RZN1_PIN(158), RZN1_PIN(159),
164 RZN1_PIN(160), RZN1_PIN(161), RZN1_PIN(162), RZN1_PIN(163),
165 RZN1_PIN(164), RZN1_PIN(165), RZN1_PIN(166), RZN1_PIN(167),
166 RZN1_PIN(168), RZN1_PIN(169),
167 };
168
169 enum {
170 LOCK_LEVEL1 = 0x1,
171 LOCK_LEVEL2 = 0x2,
172 LOCK_ALL = LOCK_LEVEL1 | LOCK_LEVEL2,
173 };
174
175 static void rzn1_hw_set_lock(struct rzn1_pinctrl *ipctl, u8 lock, u8 value)
176 {
177 /*
178 * The pinmux configuration is locked by writing the physical address of
179 * the status_protect register to itself. It is unlocked by writing the
180 * address | 1.
181 */
182 if (lock & LOCK_LEVEL1) {
183 u32 val = ipctl->lev1_protect_phys | !(value & LOCK_LEVEL1);
184
185 writel(val, &ipctl->lev1->status_protect);
186 }
187
188 if (lock & LOCK_LEVEL2) {
189 u32 val = ipctl->lev2_protect_phys | !(value & LOCK_LEVEL2);
190
191 writel(val, &ipctl->lev2->status_protect);
192 }
193 }
194
195 static void rzn1_pinctrl_mdio_select(struct rzn1_pinctrl *ipctl, int mdio,
196 u32 func)
197 {
198 if (ipctl->mdio_func[mdio] >= 0 && ipctl->mdio_func[mdio] != func)
199 dev_warn(ipctl->dev, "conflicting setting for mdio%d!\n", mdio);
200 ipctl->mdio_func[mdio] = func;
201
202 dev_dbg(ipctl->dev, "setting mdio%d to %u\n", mdio, func);
203
204 writel(func, &ipctl->lev2->l2_mdio[mdio]);
205 }
206
207 /*
208 * Using a composite pin description, set the hardware pinmux registers
209 * with the corresponding values.
210 * Make sure to unlock write protection and reset it afterward.
211 *
212 * NOTE: There is no protection for potential concurrency, it is assumed these
213 * calls are serialized already.
214 */
215 static int rzn1_set_hw_pin_func(struct rzn1_pinctrl *ipctl, unsigned int pin,
216 u32 pin_config, u8 use_locks)
217 {
218 u32 l1_cache;
219 u32 l2_cache;
220 u32 l1;
221 u32 l2;
222
223 /* Level 3 MDIO multiplexing */
224 if (pin_config >= RZN1_FUNC_MDIO0_HIGHZ &&
225 pin_config <= RZN1_FUNC_MDIO1_E1_SWITCH) {
226 int mdio_channel;
227 u32 mdio_func;
228
229 if (pin_config <= RZN1_FUNC_MDIO1_HIGHZ)
230 mdio_channel = 0;
231 else
232 mdio_channel = 1;
233
234 /* Get MDIO func, and convert the func to the level 2 number */
235 if (pin_config <= RZN1_FUNC_MDIO0_SWITCH) {
236 mdio_func = pin_config - RZN1_FUNC_MDIO0_HIGHZ;
237 pin_config = RZN1_FUNC_ETH_MDIO;
238 } else if (pin_config <= RZN1_FUNC_MDIO0_E1_SWITCH) {
239 mdio_func = pin_config - RZN1_FUNC_MDIO0_E1_HIGHZ;
240 pin_config = RZN1_FUNC_ETH_MDIO_E1;
241 } else if (pin_config <= RZN1_FUNC_MDIO1_SWITCH) {
242 mdio_func = pin_config - RZN1_FUNC_MDIO1_HIGHZ;
243 pin_config = RZN1_FUNC_ETH_MDIO;
244 } else {
245 mdio_func = pin_config - RZN1_FUNC_MDIO1_E1_HIGHZ;
246 pin_config = RZN1_FUNC_ETH_MDIO_E1;
247 }
248 rzn1_pinctrl_mdio_select(ipctl, mdio_channel, mdio_func);
249 }
250
251 /* Note here, we do not allow anything past the MDIO Mux values */
252 if (pin >= ARRAY_SIZE(ipctl->lev1->conf) ||
253 pin_config >= RZN1_FUNC_MDIO0_HIGHZ)
254 return -EINVAL;
255
256 l1 = readl(&ipctl->lev1->conf[pin]);
257 l1_cache = l1;
258 l2 = readl(&ipctl->lev2->conf[pin]);
259 l2_cache = l2;
260
261 dev_dbg(ipctl->dev, "setting func for pin %u to %u\n", pin, pin_config);
262
263 l1 &= ~(RZN1_L1_FUNC_MASK << RZN1_L1_FUNCTION);
264
265 if (pin_config < RZN1_FUNC_L2_OFFSET) {
266 l1 |= (pin_config << RZN1_L1_FUNCTION);
267 } else {
268 l1 |= (RZN1_L1_FUNCTION_L2 << RZN1_L1_FUNCTION);
269
270 l2 = pin_config - RZN1_FUNC_L2_OFFSET;
271 }
272
273 /* If either configuration changes, we update both anyway */
274 if (l1 != l1_cache || l2 != l2_cache) {
275 writel(l1, &ipctl->lev1->conf[pin]);
276 writel(l2, &ipctl->lev2->conf[pin]);
277 }
278
279 return 0;
280 }
281
282 static const struct rzn1_pin_group *rzn1_pinctrl_find_group_by_name(
283 const struct rzn1_pinctrl *ipctl, const char *name)
284 {
285 unsigned int i;
286
287 for (i = 0; i < ipctl->ngroups; i++) {
288 if (!strcmp(ipctl->groups[i].name, name))
289 return &ipctl->groups[i];
290 }
291
292 return NULL;
293 }
294
295 static int rzn1_get_groups_count(struct pinctrl_dev *pctldev)
296 {
297 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
298
299 return ipctl->ngroups;
300 }
301
302 static const char *rzn1_get_group_name(struct pinctrl_dev *pctldev,
303 unsigned int selector)
304 {
305 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
306
307 return ipctl->groups[selector].name;
308 }
309
310 static int rzn1_get_group_pins(struct pinctrl_dev *pctldev,
311 unsigned int selector, const unsigned int **pins,
312 unsigned int *npins)
313 {
314 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
315
316 if (selector >= ipctl->ngroups)
317 return -EINVAL;
318
319 *pins = ipctl->groups[selector].pins;
320 *npins = ipctl->groups[selector].npins;
321
322 return 0;
323 }
324
325 /*
326 * This function is called for each pinctl 'Function' node.
327 * Sub-nodes can be used to describe multiple 'Groups' for the 'Function'
328 * If there aren't any sub-nodes, the 'Group' is essentially the 'Function'.
329 * Each 'Group' uses pinmux = <...> to detail the pins and data used to select
330 * the functionality. Each 'Group' has optional pin configurations that apply
331 * to all pins in the 'Group'.
332 */
333 static int rzn1_dt_node_to_map_one(struct pinctrl_dev *pctldev,
334 struct device_node *np,
335 struct pinctrl_map **map,
336 unsigned int *num_maps)
337 {
338 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
339 const struct rzn1_pin_group *grp;
340 unsigned long *configs = NULL;
341 unsigned int reserved_maps = *num_maps;
342 unsigned int num_configs = 0;
343 unsigned int reserve = 1;
344 int ret;
345
346 dev_dbg(ipctl->dev, "processing node %pOF\n", np);
347
348 grp = rzn1_pinctrl_find_group_by_name(ipctl, np->name);
349 if (!grp) {
350 dev_err(ipctl->dev, "unable to find group for node %pOF\n", np);
351
352 return -EINVAL;
353 }
354
355 /* Get the group's pin configuration */
356 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
357 &num_configs);
358 if (ret < 0) {
359 dev_err(ipctl->dev, "%pOF: could not parse property\n", np);
360
361 return ret;
362 }
363
364 if (num_configs)
365 reserve++;
366
367 /* Increase the number of maps to cover this group */
368 ret = pinctrl_utils_reserve_map(pctldev, map, &reserved_maps, num_maps,
369 reserve);
370 if (ret < 0)
371 goto out;
372
373 /* Associate the group with the function */
374 ret = pinctrl_utils_add_map_mux(pctldev, map, &reserved_maps, num_maps,
375 grp->name, grp->func);
376 if (ret < 0)
377 goto out;
378
379 if (num_configs) {
380 /* Associate the group's pin configuration with the group */
381 ret = pinctrl_utils_add_map_configs(pctldev, map,
382 &reserved_maps, num_maps, grp->name,
383 configs, num_configs,
384 PIN_MAP_TYPE_CONFIGS_GROUP);
385 if (ret < 0)
386 goto out;
387 }
388
389 dev_dbg(pctldev->dev, "maps: function %s group %s (%d pins)\n",
390 grp->func, grp->name, grp->npins);
391
392 out:
393 kfree(configs);
394
395 return ret;
396 }
397
398 static int rzn1_dt_node_to_map(struct pinctrl_dev *pctldev,
399 struct device_node *np,
400 struct pinctrl_map **map,
401 unsigned int *num_maps)
402 {
403 struct device_node *child;
404 int ret;
405
406 *map = NULL;
407 *num_maps = 0;
408
409 ret = rzn1_dt_node_to_map_one(pctldev, np, map, num_maps);
410 if (ret < 0)
411 return ret;
412
413 for_each_child_of_node(np, child) {
414 ret = rzn1_dt_node_to_map_one(pctldev, child, map, num_maps);
415 if (ret < 0)
416 return ret;
417 }
418
419 return 0;
420 }
421
422 static const struct pinctrl_ops rzn1_pctrl_ops = {
423 .get_groups_count = rzn1_get_groups_count,
424 .get_group_name = rzn1_get_group_name,
425 .get_group_pins = rzn1_get_group_pins,
426 .dt_node_to_map = rzn1_dt_node_to_map,
427 .dt_free_map = pinctrl_utils_free_map,
428 };
429
430 static int rzn1_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
431 {
432 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
433
434 return ipctl->nfunctions;
435 }
436
437 static const char *rzn1_pmx_get_func_name(struct pinctrl_dev *pctldev,
438 unsigned int selector)
439 {
440 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
441
442 return ipctl->functions[selector].name;
443 }
444
445 static int rzn1_pmx_get_groups(struct pinctrl_dev *pctldev,
446 unsigned int selector,
447 const char * const **groups,
448 unsigned int * const num_groups)
449 {
450 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
451
452 *groups = ipctl->functions[selector].groups;
453 *num_groups = ipctl->functions[selector].num_groups;
454
455 return 0;
456 }
457
458 static int rzn1_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
459 unsigned int group)
460 {
461 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
462 struct rzn1_pin_group *grp = &ipctl->groups[group];
463 unsigned int i, grp_pins = grp->npins;
464
465 dev_dbg(ipctl->dev, "set mux %s(%d) group %s(%d)\n",
466 ipctl->functions[selector].name, selector, grp->name, group);
467
468 rzn1_hw_set_lock(ipctl, LOCK_ALL, LOCK_ALL);
469 for (i = 0; i < grp_pins; i++)
470 rzn1_set_hw_pin_func(ipctl, grp->pins[i], grp->pin_ids[i], 0);
471 rzn1_hw_set_lock(ipctl, LOCK_ALL, 0);
472
473 return 0;
474 }
475
476 static const struct pinmux_ops rzn1_pmx_ops = {
477 .get_functions_count = rzn1_pmx_get_funcs_count,
478 .get_function_name = rzn1_pmx_get_func_name,
479 .get_function_groups = rzn1_pmx_get_groups,
480 .set_mux = rzn1_set_mux,
481 };
482
483 static int rzn1_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
484 unsigned long *config)
485 {
486 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
487 enum pin_config_param param = pinconf_to_config_param(*config);
488 const u32 reg_drive[4] = { 4, 6, 8, 12 };
489 u32 pull, drive, l1mux;
490 u32 l1, l2, arg = 0;
491
492 if (pin >= ARRAY_SIZE(ipctl->lev1->conf))
493 return -EINVAL;
494
495 l1 = readl(&ipctl->lev1->conf[pin]);
496
497 l1mux = l1 & RZN1_L1_FUNC_MASK;
498 pull = (l1 >> RZN1_L1_PIN_PULL) & 0x3;
499 drive = (l1 >> RZN1_L1_PIN_DRIVE_STRENGTH) & 0x3;
500
501 switch (param) {
502 case PIN_CONFIG_BIAS_PULL_UP:
503 if (pull != RZN1_L1_PIN_PULL_UP)
504 return -EINVAL;
505 break;
506 case PIN_CONFIG_BIAS_PULL_DOWN:
507 if (pull != RZN1_L1_PIN_PULL_DOWN)
508 return -EINVAL;
509 break;
510 case PIN_CONFIG_BIAS_DISABLE:
511 if (pull != RZN1_L1_PIN_PULL_NONE)
512 return -EINVAL;
513 break;
514 case PIN_CONFIG_DRIVE_STRENGTH:
515 arg = reg_drive[drive];
516 break;
517 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
518 l2 = readl(&ipctl->lev2->conf[pin]);
519 if (l1mux == RZN1_L1_FUNCTION_L2) {
520 if (l2 != 0)
521 return -EINVAL;
522 } else if (l1mux != RZN1_FUNC_HIGHZ) {
523 return -EINVAL;
524 }
525 break;
526 default:
527 return -ENOTSUPP;
528 }
529
530 *config = pinconf_to_config_packed(param, arg);
531
532 return 0;
533 }
534
535 static int rzn1_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
536 unsigned long *configs, unsigned int num_configs)
537 {
538 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
539 enum pin_config_param param;
540 unsigned int i;
541 u32 l1, l1_cache;
542 u32 drv;
543 u32 arg;
544
545 if (pin >= ARRAY_SIZE(ipctl->lev1->conf))
546 return -EINVAL;
547
548 l1 = readl(&ipctl->lev1->conf[pin]);
549 l1_cache = l1;
550
551 for (i = 0; i < num_configs; i++) {
552 param = pinconf_to_config_param(configs[i]);
553 arg = pinconf_to_config_argument(configs[i]);
554
555 switch (param) {
556 case PIN_CONFIG_BIAS_PULL_UP:
557 dev_dbg(ipctl->dev, "set pin %d pull up\n", pin);
558 l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
559 l1 |= (RZN1_L1_PIN_PULL_UP << RZN1_L1_PIN_PULL);
560 break;
561 case PIN_CONFIG_BIAS_PULL_DOWN:
562 dev_dbg(ipctl->dev, "set pin %d pull down\n", pin);
563 l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
564 l1 |= (RZN1_L1_PIN_PULL_DOWN << RZN1_L1_PIN_PULL);
565 break;
566 case PIN_CONFIG_BIAS_DISABLE:
567 dev_dbg(ipctl->dev, "set pin %d bias off\n", pin);
568 l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
569 l1 |= (RZN1_L1_PIN_PULL_NONE << RZN1_L1_PIN_PULL);
570 break;
571 case PIN_CONFIG_DRIVE_STRENGTH:
572 dev_dbg(ipctl->dev, "set pin %d drv %umA\n", pin, arg);
573 switch (arg) {
574 case 4:
575 drv = RZN1_L1_PIN_DRIVE_STRENGTH_4MA;
576 break;
577 case 6:
578 drv = RZN1_L1_PIN_DRIVE_STRENGTH_6MA;
579 break;
580 case 8:
581 drv = RZN1_L1_PIN_DRIVE_STRENGTH_8MA;
582 break;
583 case 12:
584 drv = RZN1_L1_PIN_DRIVE_STRENGTH_12MA;
585 break;
586 default:
587 dev_err(ipctl->dev,
588 "Drive strength %umA not supported\n",
589 arg);
590
591 return -EINVAL;
592 }
593
594 l1 &= ~(0x3 << RZN1_L1_PIN_DRIVE_STRENGTH);
595 l1 |= (drv << RZN1_L1_PIN_DRIVE_STRENGTH);
596 break;
597
598 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
599 dev_dbg(ipctl->dev, "set pin %d High-Z\n", pin);
600 l1 &= ~RZN1_L1_FUNC_MASK;
601 l1 |= RZN1_FUNC_HIGHZ;
602 break;
603 default:
604 return -ENOTSUPP;
605 }
606 }
607
608 if (l1 != l1_cache) {
609 rzn1_hw_set_lock(ipctl, LOCK_LEVEL1, LOCK_LEVEL1);
610 writel(l1, &ipctl->lev1->conf[pin]);
611 rzn1_hw_set_lock(ipctl, LOCK_LEVEL1, 0);
612 }
613
614 return 0;
615 }
616
617 static int rzn1_pinconf_group_get(struct pinctrl_dev *pctldev,
618 unsigned int selector,
619 unsigned long *config)
620 {
621 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
622 struct rzn1_pin_group *grp = &ipctl->groups[selector];
623 unsigned long old = 0;
624 unsigned int i;
625
626 dev_dbg(ipctl->dev, "group get %s selector:%u\n", grp->name, selector);
627
628 for (i = 0; i < grp->npins; i++) {
629 if (rzn1_pinconf_get(pctldev, grp->pins[i], config))
630 return -ENOTSUPP;
631
632 /* configs do not match between two pins */
633 if (i && (old != *config))
634 return -ENOTSUPP;
635
636 old = *config;
637 }
638
639 return 0;
640 }
641
642 static int rzn1_pinconf_group_set(struct pinctrl_dev *pctldev,
643 unsigned int selector,
644 unsigned long *configs,
645 unsigned int num_configs)
646 {
647 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
648 struct rzn1_pin_group *grp = &ipctl->groups[selector];
649 unsigned int i;
650 int ret;
651
652 dev_dbg(ipctl->dev, "group set %s selector:%u configs:%p/%d\n",
653 grp->name, selector, configs, num_configs);
654
655 for (i = 0; i < grp->npins; i++) {
656 unsigned int pin = grp->pins[i];
657
658 ret = rzn1_pinconf_set(pctldev, pin, configs, num_configs);
659 if (ret)
660 return ret;
661 }
662
663 return 0;
664 }
665
666 static const struct pinconf_ops rzn1_pinconf_ops = {
667 .is_generic = true,
668 .pin_config_get = rzn1_pinconf_get,
669 .pin_config_set = rzn1_pinconf_set,
670 .pin_config_group_get = rzn1_pinconf_group_get,
671 .pin_config_group_set = rzn1_pinconf_group_set,
672 .pin_config_config_dbg_show = pinconf_generic_dump_config,
673 };
674
675 static struct pinctrl_desc rzn1_pinctrl_desc = {
676 .pctlops = &rzn1_pctrl_ops,
677 .pmxops = &rzn1_pmx_ops,
678 .confops = &rzn1_pinconf_ops,
679 .owner = THIS_MODULE,
680 };
681
682 static int rzn1_pinctrl_parse_groups(struct device_node *np,
683 struct rzn1_pin_group *grp,
684 struct rzn1_pinctrl *ipctl)
685 {
686 const __be32 *list;
687 unsigned int i;
688 int size;
689
690 dev_dbg(ipctl->dev, "%s: %s\n", __func__, np->name);
691
692 /* Initialise group */
693 grp->name = np->name;
694
695 /*
696 * The binding format is
697 * pinmux = <PIN_FUNC_ID CONFIG ...>,
698 * do sanity check and calculate pins number
699 */
700 list = of_get_property(np, RZN1_PINS_PROP, &size);
701 if (!list) {
702 dev_err(ipctl->dev,
703 "no " RZN1_PINS_PROP " property in node %pOF\n", np);
704
705 return -EINVAL;
706 }
707
708 if (!size) {
709 dev_err(ipctl->dev, "Invalid " RZN1_PINS_PROP " in node %pOF\n",
710 np);
711
712 return -EINVAL;
713 }
714
715 grp->npins = size / sizeof(list[0]);
716 grp->pin_ids = devm_kmalloc_array(ipctl->dev,
717 grp->npins, sizeof(grp->pin_ids[0]),
718 GFP_KERNEL);
719 grp->pins = devm_kmalloc_array(ipctl->dev,
720 grp->npins, sizeof(grp->pins[0]),
721 GFP_KERNEL);
722 if (!grp->pin_ids || !grp->pins)
723 return -ENOMEM;
724
725 for (i = 0; i < grp->npins; i++) {
726 u32 pin_id = be32_to_cpu(*list++);
727
728 grp->pins[i] = pin_id & 0xff;
729 grp->pin_ids[i] = (pin_id >> 8) & 0x7f;
730 }
731
732 return grp->npins;
733 }
734
735 static int rzn1_pinctrl_count_function_groups(struct device_node *np)
736 {
737 struct device_node *child;
738 int count = 0;
739
740 if (of_property_count_u32_elems(np, RZN1_PINS_PROP) > 0)
741 count++;
742
743 for_each_child_of_node(np, child) {
744 if (of_property_count_u32_elems(child, RZN1_PINS_PROP) > 0)
745 count++;
746 }
747
748 return count;
749 }
750
751 static int rzn1_pinctrl_parse_functions(struct device_node *np,
752 struct rzn1_pinctrl *ipctl,
753 unsigned int index)
754 {
755 struct rzn1_pmx_func *func;
756 struct rzn1_pin_group *grp;
757 struct device_node *child;
758 unsigned int i = 0;
759 int ret;
760
761 func = &ipctl->functions[index];
762
763 /* Initialise function */
764 func->name = np->name;
765 func->num_groups = rzn1_pinctrl_count_function_groups(np);
766 if (func->num_groups == 0) {
767 dev_err(ipctl->dev, "no groups defined in %pOF\n", np);
768 return -EINVAL;
769 }
770 dev_dbg(ipctl->dev, "function %s has %d groups\n",
771 np->name, func->num_groups);
772
773 func->groups = devm_kmalloc_array(ipctl->dev,
774 func->num_groups, sizeof(char *),
775 GFP_KERNEL);
776 if (!func->groups)
777 return -ENOMEM;
778
779 if (of_property_count_u32_elems(np, RZN1_PINS_PROP) > 0) {
780 func->groups[i] = np->name;
781 grp = &ipctl->groups[ipctl->ngroups];
782 grp->func = func->name;
783 ret = rzn1_pinctrl_parse_groups(np, grp, ipctl);
784 if (ret < 0)
785 return ret;
786 i++;
787 ipctl->ngroups++;
788 }
789
790 for_each_child_of_node(np, child) {
791 func->groups[i] = child->name;
792 grp = &ipctl->groups[ipctl->ngroups];
793 grp->func = func->name;
794 ret = rzn1_pinctrl_parse_groups(child, grp, ipctl);
795 if (ret < 0)
796 return ret;
797 i++;
798 ipctl->ngroups++;
799 }
800
801 dev_dbg(ipctl->dev, "function %s parsed %u/%u groups\n",
802 np->name, i, func->num_groups);
803
804 return 0;
805 }
806
807 static int rzn1_pinctrl_probe_dt(struct platform_device *pdev,
808 struct rzn1_pinctrl *ipctl)
809 {
810 struct device_node *np = pdev->dev.of_node;
811 struct device_node *child;
812 unsigned int maxgroups = 0;
813 unsigned int i = 0;
814 int nfuncs = 0;
815 int ret;
816
817 nfuncs = of_get_child_count(np);
818 if (nfuncs <= 0)
819 return 0;
820
821 ipctl->nfunctions = nfuncs;
822 ipctl->functions = devm_kmalloc_array(&pdev->dev, nfuncs,
823 sizeof(*ipctl->functions),
824 GFP_KERNEL);
825 if (!ipctl->functions)
826 return -ENOMEM;
827
828 ipctl->ngroups = 0;
829 for_each_child_of_node(np, child)
830 maxgroups += rzn1_pinctrl_count_function_groups(child);
831
832 ipctl->groups = devm_kmalloc_array(&pdev->dev,
833 maxgroups,
834 sizeof(*ipctl->groups),
835 GFP_KERNEL);
836 if (!ipctl->groups)
837 return -ENOMEM;
838
839 for_each_child_of_node(np, child) {
840 ret = rzn1_pinctrl_parse_functions(child, ipctl, i++);
841 if (ret < 0)
842 return ret;
843 }
844
845 return 0;
846 }
847
848 static int rzn1_pinctrl_probe(struct platform_device *pdev)
849 {
850 struct rzn1_pinctrl *ipctl;
851 struct resource *res;
852 int ret;
853
854 /* Create state holders etc for this driver */
855 ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL);
856 if (!ipctl)
857 return -ENOMEM;
858
859 ipctl->mdio_func[0] = -1;
860 ipctl->mdio_func[1] = -1;
861
862 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
863 ipctl->lev1_protect_phys = (u32)res->start + 0x400;
864 ipctl->lev1 = devm_ioremap_resource(&pdev->dev, res);
865 if (IS_ERR(ipctl->lev1))
866 return PTR_ERR(ipctl->lev1);
867
868 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
869 ipctl->lev2_protect_phys = (u32)res->start + 0x400;
870 ipctl->lev2 = devm_ioremap_resource(&pdev->dev, res);
871 if (IS_ERR(ipctl->lev2))
872 return PTR_ERR(ipctl->lev2);
873
874 ipctl->clk = devm_clk_get(&pdev->dev, NULL);
875 if (IS_ERR(ipctl->clk))
876 return PTR_ERR(ipctl->clk);
877 ret = clk_prepare_enable(ipctl->clk);
878 if (ret)
879 return ret;
880
881 ipctl->dev = &pdev->dev;
882 rzn1_pinctrl_desc.name = dev_name(&pdev->dev);
883 rzn1_pinctrl_desc.pins = rzn1_pins;
884 rzn1_pinctrl_desc.npins = ARRAY_SIZE(rzn1_pins);
885
886 ret = rzn1_pinctrl_probe_dt(pdev, ipctl);
887 if (ret) {
888 dev_err(&pdev->dev, "fail to probe dt properties\n");
889 goto err_clk;
890 }
891
892 platform_set_drvdata(pdev, ipctl);
893
894 ret = devm_pinctrl_register_and_init(&pdev->dev, &rzn1_pinctrl_desc,
895 ipctl, &ipctl->pctl);
896 if (ret) {
897 dev_err(&pdev->dev, "could not register rzn1 pinctrl driver\n");
898 goto err_clk;
899 }
900
901 ret = pinctrl_enable(ipctl->pctl);
902 if (ret)
903 goto err_clk;
904
905 dev_info(&pdev->dev, "probed\n");
906
907 return 0;
908
909 err_clk:
910 clk_disable_unprepare(ipctl->clk);
911
912 return ret;
913 }
914
915 static int rzn1_pinctrl_remove(struct platform_device *pdev)
916 {
917 struct rzn1_pinctrl *ipctl = platform_get_drvdata(pdev);
918
919 clk_disable_unprepare(ipctl->clk);
920
921 return 0;
922 }
923
924 static const struct of_device_id rzn1_pinctrl_match[] = {
925 { .compatible = "renesas,rzn1-pinctrl", },
926 {}
927 };
928 MODULE_DEVICE_TABLE(of, rzn1_pinctrl_match);
929
930 static struct platform_driver rzn1_pinctrl_driver = {
931 .probe = rzn1_pinctrl_probe,
932 .remove = rzn1_pinctrl_remove,
933 .driver = {
934 .name = "rzn1-pinctrl",
935 .of_match_table = rzn1_pinctrl_match,
936 },
937 };
938
939 static int __init _pinctrl_drv_register(void)
940 {
941 return platform_driver_register(&rzn1_pinctrl_driver);
942 }
943 subsys_initcall(_pinctrl_drv_register);
944
945 MODULE_AUTHOR("Phil Edworthy <phil.edworthy@renesas.com>");
946 MODULE_DESCRIPTION("Renesas RZ/N1 pinctrl driver");
947 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support