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
11 #include <linux/clk.h>
12 #include <linux/device.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/slab.h>
18
19 #include <linux/pinctrl/pinconf-generic.h>
20 #include <linux/pinctrl/pinconf.h>
21 #include <linux/pinctrl/pinctrl.h>
22 #include <linux/pinctrl/pinmux.h>
23
24 #include "../core.h"
25 #include "../pinconf.h"
26 #include "../pinctrl-utils.h"
27
28 /* Field positions and masks in the pinmux registers */
29 #define RZN1_L1_PIN_DRIVE_STRENGTH 10
30 #define RZN1_L1_PIN_DRIVE_STRENGTH_4MA 0
31 #define RZN1_L1_PIN_DRIVE_STRENGTH_6MA 1
32 #define RZN1_L1_PIN_DRIVE_STRENGTH_8MA 2
33 #define RZN1_L1_PIN_DRIVE_STRENGTH_12MA 3
34 #define RZN1_L1_PIN_PULL 8
35 #define RZN1_L1_PIN_PULL_NONE 0
36 #define RZN1_L1_PIN_PULL_UP 1
37 #define RZN1_L1_PIN_PULL_DOWN 3
38 #define RZN1_L1_FUNCTION 0
39 #define RZN1_L1_FUNC_MASK 0xf
40 #define RZN1_L1_FUNCTION_L2 0xf
41
42 /*
43 * The hardware manual describes two levels of multiplexing, but it's more
44 * logical to think of the hardware as three levels, with level 3 consisting of
45 * the multiplexing for Ethernet MDIO signals.
46 *
47 * Level 1 functions go from 0 to 9, with level 1 function '15' (0xf) specifying
48 * that level 2 functions are used instead. Level 2 has a lot more options,
49 * going from 0 to 61. Level 3 allows selection of MDIO functions which can be
50 * floating, or one of seven internal peripherals. Unfortunately, there are two
51 * level 2 functions that can select MDIO, and two MDIO channels so we have four
52 * sets of level 3 functions.
53 *
54 * For this driver, we've compounded the numbers together, so:
55 * 0 to 9 is level 1
56 * 10 to 71 is 10 + level 2 number
57 * 72 to 79 is 72 + MDIO0 source for level 2 MDIO function.
58 * 80 to 87 is 80 + MDIO0 source for level 2 MDIO_E1 function.
59 * 88 to 95 is 88 + MDIO1 source for level 2 MDIO function.
60 * 96 to 103 is 96 + MDIO1 source for level 2 MDIO_E1 function.
61 * Examples:
62 * Function 28 corresponds UART0
63 * Function 73 corresponds to MDIO0 to GMAC0
64 *
65 * There are 170 configurable pins (called PL_GPIO in the datasheet).
66 */
67
68 /*
69 * Structure detailing the HW registers on the RZ/N1 devices.
70 * Both the Level 1 mux registers and Level 2 mux registers have the same
71 * structure. The only difference is that Level 2 has additional MDIO registers
72 * at the end.
73 */
74 struct rzn1_pinctrl_regs {
75 u32 conf[170];
76 u32 pad0[86];
77 u32 status_protect; /* 0x400 */
78 /* MDIO mux registers, level2 only */
79 u32 l2_mdio[2];
80 };
81
82 /**
83 * struct rzn1_pmx_func - describes rzn1 pinmux functions
84 * @name: the name of this specific function
85 * @groups: corresponding pin groups
86 * @num_groups: the number of groups
87 */
88 struct rzn1_pmx_func {
89 const char *name;
90 const char **groups;
91 unsigned int num_groups;
92 };
93
94 /**
95 * struct rzn1_pin_group - describes an rzn1 pin group
96 * @name: the name of this specific pin group
97 * @func: the name of the function selected by this group
98 * @npins: the number of pins in this group array, i.e. the number of
99 * elements in .pins so we can iterate over that array
100 * @pins: array of pins. Needed due to pinctrl_ops.get_group_pins()
101 * @pin_ids: array of pin_ids, i.e. the value used to select the mux
102 */
103 struct rzn1_pin_group {
104 const char *name;
105 const char *func;
106 unsigned int npins;
107 unsigned int *pins;
108 u8 *pin_ids;
109 };
110
111 struct rzn1_pinctrl {
112 struct device *dev;
113 struct clk *clk;
114 struct pinctrl_dev *pctl;
115 struct rzn1_pinctrl_regs __iomem *lev1;
116 struct rzn1_pinctrl_regs __iomem *lev2;
117 u32 lev1_protect_phys;
118 u32 lev2_protect_phys;
119 int mdio_func[2];
120
121 struct rzn1_pin_group *groups;
122 unsigned int ngroups;
123
124 struct rzn1_pmx_func *functions;
125 unsigned int nfunctions;
126 };
127
128 #define RZN1_PINS_PROP "pinmux"
129
130 #define RZN1_PIN(pin) PINCTRL_PIN(pin, "pl_gpio"#pin)
131
132 static const struct pinctrl_pin_desc rzn1_pins[] = {
133 RZN1_PIN(0), RZN1_PIN(1), RZN1_PIN(2), RZN1_PIN(3), RZN1_PIN(4),
134 RZN1_PIN(5), RZN1_PIN(6), RZN1_PIN(7), RZN1_PIN(8), RZN1_PIN(9),
135 RZN1_PIN(10), RZN1_PIN(11), RZN1_PIN(12), RZN1_PIN(13), RZN1_PIN(14),
136 RZN1_PIN(15), RZN1_PIN(16), RZN1_PIN(17), RZN1_PIN(18), RZN1_PIN(19),
137 RZN1_PIN(20), RZN1_PIN(21), RZN1_PIN(22), RZN1_PIN(23), RZN1_PIN(24),
138 RZN1_PIN(25), RZN1_PIN(26), RZN1_PIN(27), RZN1_PIN(28), RZN1_PIN(29),
139 RZN1_PIN(30), RZN1_PIN(31), RZN1_PIN(32), RZN1_PIN(33), RZN1_PIN(34),
140 RZN1_PIN(35), RZN1_PIN(36), RZN1_PIN(37), RZN1_PIN(38), RZN1_PIN(39),
141 RZN1_PIN(40), RZN1_PIN(41), RZN1_PIN(42), RZN1_PIN(43), RZN1_PIN(44),
142 RZN1_PIN(45), RZN1_PIN(46), RZN1_PIN(47), RZN1_PIN(48), RZN1_PIN(49),
143 RZN1_PIN(50), RZN1_PIN(51), RZN1_PIN(52), RZN1_PIN(53), RZN1_PIN(54),
144 RZN1_PIN(55), RZN1_PIN(56), RZN1_PIN(57), RZN1_PIN(58), RZN1_PIN(59),
145 RZN1_PIN(60), RZN1_PIN(61), RZN1_PIN(62), RZN1_PIN(63), RZN1_PIN(64),
146 RZN1_PIN(65), RZN1_PIN(66), RZN1_PIN(67), RZN1_PIN(68), RZN1_PIN(69),
147 RZN1_PIN(70), RZN1_PIN(71), RZN1_PIN(72), RZN1_PIN(73), RZN1_PIN(74),
148 RZN1_PIN(75), RZN1_PIN(76), RZN1_PIN(77), RZN1_PIN(78), RZN1_PIN(79),
149 RZN1_PIN(80), RZN1_PIN(81), RZN1_PIN(82), RZN1_PIN(83), RZN1_PIN(84),
150 RZN1_PIN(85), RZN1_PIN(86), RZN1_PIN(87), RZN1_PIN(88), RZN1_PIN(89),
151 RZN1_PIN(90), RZN1_PIN(91), RZN1_PIN(92), RZN1_PIN(93), RZN1_PIN(94),
152 RZN1_PIN(95), RZN1_PIN(96), RZN1_PIN(97), RZN1_PIN(98), RZN1_PIN(99),
153 RZN1_PIN(100), RZN1_PIN(101), RZN1_PIN(102), RZN1_PIN(103),
154 RZN1_PIN(104), RZN1_PIN(105), RZN1_PIN(106), RZN1_PIN(107),
155 RZN1_PIN(108), RZN1_PIN(109), RZN1_PIN(110), RZN1_PIN(111),
156 RZN1_PIN(112), RZN1_PIN(113), RZN1_PIN(114), RZN1_PIN(115),
157 RZN1_PIN(116), RZN1_PIN(117), RZN1_PIN(118), RZN1_PIN(119),
158 RZN1_PIN(120), RZN1_PIN(121), RZN1_PIN(122), RZN1_PIN(123),
159 RZN1_PIN(124), RZN1_PIN(125), RZN1_PIN(126), RZN1_PIN(127),
160 RZN1_PIN(128), RZN1_PIN(129), RZN1_PIN(130), RZN1_PIN(131),
161 RZN1_PIN(132), RZN1_PIN(133), RZN1_PIN(134), RZN1_PIN(135),
162 RZN1_PIN(136), RZN1_PIN(137), RZN1_PIN(138), RZN1_PIN(139),
163 RZN1_PIN(140), RZN1_PIN(141), RZN1_PIN(142), RZN1_PIN(143),
164 RZN1_PIN(144), RZN1_PIN(145), RZN1_PIN(146), RZN1_PIN(147),
165 RZN1_PIN(148), RZN1_PIN(149), RZN1_PIN(150), RZN1_PIN(151),
166 RZN1_PIN(152), RZN1_PIN(153), RZN1_PIN(154), RZN1_PIN(155),
167 RZN1_PIN(156), RZN1_PIN(157), RZN1_PIN(158), RZN1_PIN(159),
168 RZN1_PIN(160), RZN1_PIN(161), RZN1_PIN(162), RZN1_PIN(163),
169 RZN1_PIN(164), RZN1_PIN(165), RZN1_PIN(166), RZN1_PIN(167),
170 RZN1_PIN(168), RZN1_PIN(169),
171 };
172
173 enum {
174 LOCK_LEVEL1 = 0x1,
175 LOCK_LEVEL2 = 0x2,
176 LOCK_ALL = LOCK_LEVEL1 | LOCK_LEVEL2,
177 };
178
rzn1_hw_set_lock(struct rzn1_pinctrl * ipctl,u8 lock,u8 value)179 static void rzn1_hw_set_lock(struct rzn1_pinctrl *ipctl, u8 lock, u8 value)
180 {
181 /*
182 * The pinmux configuration is locked by writing the physical address of
183 * the status_protect register to itself. It is unlocked by writing the
184 * address | 1.
185 */
186 if (lock & LOCK_LEVEL1) {
187 u32 val = ipctl->lev1_protect_phys | !(value & LOCK_LEVEL1);
188
189 writel(val, &ipctl->lev1->status_protect);
190 }
191
192 if (lock & LOCK_LEVEL2) {
193 u32 val = ipctl->lev2_protect_phys | !(value & LOCK_LEVEL2);
194
195 writel(val, &ipctl->lev2->status_protect);
196 }
197 }
198
rzn1_pinctrl_mdio_select(struct rzn1_pinctrl * ipctl,int mdio,u32 func)199 static void rzn1_pinctrl_mdio_select(struct rzn1_pinctrl *ipctl, int mdio,
200 u32 func)
201 {
202 if (ipctl->mdio_func[mdio] >= 0 && ipctl->mdio_func[mdio] != func)
203 dev_warn(ipctl->dev, "conflicting setting for mdio%d!\n", mdio);
204 ipctl->mdio_func[mdio] = func;
205
206 dev_dbg(ipctl->dev, "setting mdio%d to %u\n", mdio, func);
207
208 writel(func, &ipctl->lev2->l2_mdio[mdio]);
209 }
210
211 /*
212 * Using a composite pin description, set the hardware pinmux registers
213 * with the corresponding values.
214 * Make sure to unlock write protection and reset it afterward.
215 *
216 * NOTE: There is no protection for potential concurrency, it is assumed these
217 * calls are serialized already.
218 */
rzn1_set_hw_pin_func(struct rzn1_pinctrl * ipctl,unsigned int pin,u32 pin_config,u8 use_locks)219 static int rzn1_set_hw_pin_func(struct rzn1_pinctrl *ipctl, unsigned int pin,
220 u32 pin_config, u8 use_locks)
221 {
222 u32 l1_cache;
223 u32 l2_cache;
224 u32 l1;
225 u32 l2;
226
227 /* Level 3 MDIO multiplexing */
228 if (pin_config >= RZN1_FUNC_MDIO0_HIGHZ &&
229 pin_config <= RZN1_FUNC_MDIO1_E1_SWITCH) {
230 int mdio_channel;
231 u32 mdio_func;
232
233 if (pin_config <= RZN1_FUNC_MDIO1_HIGHZ)
234 mdio_channel = 0;
235 else
236 mdio_channel = 1;
237
238 /* Get MDIO func, and convert the func to the level 2 number */
239 if (pin_config <= RZN1_FUNC_MDIO0_SWITCH) {
240 mdio_func = pin_config - RZN1_FUNC_MDIO0_HIGHZ;
241 pin_config = RZN1_FUNC_ETH_MDIO;
242 } else if (pin_config <= RZN1_FUNC_MDIO0_E1_SWITCH) {
243 mdio_func = pin_config - RZN1_FUNC_MDIO0_E1_HIGHZ;
244 pin_config = RZN1_FUNC_ETH_MDIO_E1;
245 } else if (pin_config <= RZN1_FUNC_MDIO1_SWITCH) {
246 mdio_func = pin_config - RZN1_FUNC_MDIO1_HIGHZ;
247 pin_config = RZN1_FUNC_ETH_MDIO;
248 } else {
249 mdio_func = pin_config - RZN1_FUNC_MDIO1_E1_HIGHZ;
250 pin_config = RZN1_FUNC_ETH_MDIO_E1;
251 }
252 rzn1_pinctrl_mdio_select(ipctl, mdio_channel, mdio_func);
253 }
254
255 /* Note here, we do not allow anything past the MDIO Mux values */
256 if (pin >= ARRAY_SIZE(ipctl->lev1->conf) ||
257 pin_config >= RZN1_FUNC_MDIO0_HIGHZ)
258 return -EINVAL;
259
260 l1 = readl(&ipctl->lev1->conf[pin]);
261 l1_cache = l1;
262 l2 = readl(&ipctl->lev2->conf[pin]);
263 l2_cache = l2;
264
265 dev_dbg(ipctl->dev, "setting func for pin %u to %u\n", pin, pin_config);
266
267 l1 &= ~(RZN1_L1_FUNC_MASK << RZN1_L1_FUNCTION);
268
269 if (pin_config < RZN1_FUNC_L2_OFFSET) {
270 l1 |= (pin_config << RZN1_L1_FUNCTION);
271 } else {
272 l1 |= (RZN1_L1_FUNCTION_L2 << RZN1_L1_FUNCTION);
273
274 l2 = pin_config - RZN1_FUNC_L2_OFFSET;
275 }
276
277 /* If either configuration changes, we update both anyway */
278 if (l1 != l1_cache || l2 != l2_cache) {
279 writel(l1, &ipctl->lev1->conf[pin]);
280 writel(l2, &ipctl->lev2->conf[pin]);
281 }
282
283 return 0;
284 }
285
rzn1_pinctrl_find_group_by_name(const struct rzn1_pinctrl * ipctl,const char * name)286 static const struct rzn1_pin_group *rzn1_pinctrl_find_group_by_name(
287 const struct rzn1_pinctrl *ipctl, const char *name)
288 {
289 unsigned int i;
290
291 for (i = 0; i < ipctl->ngroups; i++) {
292 if (!strcmp(ipctl->groups[i].name, name))
293 return &ipctl->groups[i];
294 }
295
296 return NULL;
297 }
298
rzn1_get_groups_count(struct pinctrl_dev * pctldev)299 static int rzn1_get_groups_count(struct pinctrl_dev *pctldev)
300 {
301 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
302
303 return ipctl->ngroups;
304 }
305
rzn1_get_group_name(struct pinctrl_dev * pctldev,unsigned int selector)306 static const char *rzn1_get_group_name(struct pinctrl_dev *pctldev,
307 unsigned int selector)
308 {
309 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
310
311 return ipctl->groups[selector].name;
312 }
313
rzn1_get_group_pins(struct pinctrl_dev * pctldev,unsigned int selector,const unsigned int ** pins,unsigned int * npins)314 static int rzn1_get_group_pins(struct pinctrl_dev *pctldev,
315 unsigned int selector, const unsigned int **pins,
316 unsigned int *npins)
317 {
318 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
319
320 if (selector >= ipctl->ngroups)
321 return -EINVAL;
322
323 *pins = ipctl->groups[selector].pins;
324 *npins = ipctl->groups[selector].npins;
325
326 return 0;
327 }
328
329 /*
330 * This function is called for each pinctl 'Function' node.
331 * Sub-nodes can be used to describe multiple 'Groups' for the 'Function'
332 * If there aren't any sub-nodes, the 'Group' is essentially the 'Function'.
333 * Each 'Group' uses pinmux = <...> to detail the pins and data used to select
334 * the functionality. Each 'Group' has optional pin configurations that apply
335 * to all pins in the 'Group'.
336 */
rzn1_dt_node_to_map_one(struct pinctrl_dev * pctldev,struct device_node * np,struct pinctrl_map ** map,unsigned int * num_maps)337 static int rzn1_dt_node_to_map_one(struct pinctrl_dev *pctldev,
338 struct device_node *np,
339 struct pinctrl_map **map,
340 unsigned int *num_maps)
341 {
342 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
343 const struct rzn1_pin_group *grp;
344 unsigned long *configs = NULL;
345 unsigned int reserved_maps = *num_maps;
346 unsigned int num_configs = 0;
347 unsigned int reserve = 1;
348 int ret;
349
350 dev_dbg(ipctl->dev, "processing node %pOF\n", np);
351
352 grp = rzn1_pinctrl_find_group_by_name(ipctl, np->name);
353 if (!grp) {
354 dev_err(ipctl->dev, "unable to find group for node %pOF\n", np);
355
356 return -EINVAL;
357 }
358
359 /* Get the group's pin configuration */
360 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
361 &num_configs);
362 if (ret < 0) {
363 dev_err(ipctl->dev, "%pOF: could not parse property\n", np);
364
365 return ret;
366 }
367
368 if (num_configs)
369 reserve++;
370
371 /* Increase the number of maps to cover this group */
372 ret = pinctrl_utils_reserve_map(pctldev, map, &reserved_maps, num_maps,
373 reserve);
374 if (ret < 0)
375 goto out;
376
377 /* Associate the group with the function */
378 ret = pinctrl_utils_add_map_mux(pctldev, map, &reserved_maps, num_maps,
379 grp->name, grp->func);
380 if (ret < 0)
381 goto out;
382
383 if (num_configs) {
384 /* Associate the group's pin configuration with the group */
385 ret = pinctrl_utils_add_map_configs(pctldev, map,
386 &reserved_maps, num_maps, grp->name,
387 configs, num_configs,
388 PIN_MAP_TYPE_CONFIGS_GROUP);
389 if (ret < 0)
390 goto out;
391 }
392
393 dev_dbg(pctldev->dev, "maps: function %s group %s (%d pins)\n",
394 grp->func, grp->name, grp->npins);
395
396 out:
397 kfree(configs);
398
399 return ret;
400 }
401
rzn1_dt_node_to_map(struct pinctrl_dev * pctldev,struct device_node * np,struct pinctrl_map ** map,unsigned int * num_maps)402 static int rzn1_dt_node_to_map(struct pinctrl_dev *pctldev,
403 struct device_node *np,
404 struct pinctrl_map **map,
405 unsigned int *num_maps)
406 {
407 struct device_node *child;
408 int ret;
409
410 *map = NULL;
411 *num_maps = 0;
412
413 ret = rzn1_dt_node_to_map_one(pctldev, np, map, num_maps);
414 if (ret < 0)
415 return ret;
416
417 for_each_child_of_node(np, child) {
418 ret = rzn1_dt_node_to_map_one(pctldev, child, map, num_maps);
419 if (ret < 0) {
420 of_node_put(child);
421 return ret;
422 }
423 }
424
425 return 0;
426 }
427
428 static const struct pinctrl_ops rzn1_pctrl_ops = {
429 .get_groups_count = rzn1_get_groups_count,
430 .get_group_name = rzn1_get_group_name,
431 .get_group_pins = rzn1_get_group_pins,
432 .dt_node_to_map = rzn1_dt_node_to_map,
433 .dt_free_map = pinctrl_utils_free_map,
434 };
435
rzn1_pmx_get_funcs_count(struct pinctrl_dev * pctldev)436 static int rzn1_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
437 {
438 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
439
440 return ipctl->nfunctions;
441 }
442
rzn1_pmx_get_func_name(struct pinctrl_dev * pctldev,unsigned int selector)443 static const char *rzn1_pmx_get_func_name(struct pinctrl_dev *pctldev,
444 unsigned int selector)
445 {
446 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
447
448 return ipctl->functions[selector].name;
449 }
450
rzn1_pmx_get_groups(struct pinctrl_dev * pctldev,unsigned int selector,const char * const ** groups,unsigned int * const num_groups)451 static int rzn1_pmx_get_groups(struct pinctrl_dev *pctldev,
452 unsigned int selector,
453 const char * const **groups,
454 unsigned int * const num_groups)
455 {
456 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
457
458 *groups = ipctl->functions[selector].groups;
459 *num_groups = ipctl->functions[selector].num_groups;
460
461 return 0;
462 }
463
rzn1_set_mux(struct pinctrl_dev * pctldev,unsigned int selector,unsigned int group)464 static int rzn1_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
465 unsigned int group)
466 {
467 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
468 struct rzn1_pin_group *grp = &ipctl->groups[group];
469 unsigned int i, grp_pins = grp->npins;
470
471 dev_dbg(ipctl->dev, "set mux %s(%d) group %s(%d)\n",
472 ipctl->functions[selector].name, selector, grp->name, group);
473
474 rzn1_hw_set_lock(ipctl, LOCK_ALL, LOCK_ALL);
475 for (i = 0; i < grp_pins; i++)
476 rzn1_set_hw_pin_func(ipctl, grp->pins[i], grp->pin_ids[i], 0);
477 rzn1_hw_set_lock(ipctl, LOCK_ALL, 0);
478
479 return 0;
480 }
481
482 static const struct pinmux_ops rzn1_pmx_ops = {
483 .get_functions_count = rzn1_pmx_get_funcs_count,
484 .get_function_name = rzn1_pmx_get_func_name,
485 .get_function_groups = rzn1_pmx_get_groups,
486 .set_mux = rzn1_set_mux,
487 };
488
rzn1_pinconf_get(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * config)489 static int rzn1_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
490 unsigned long *config)
491 {
492 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
493 enum pin_config_param param = pinconf_to_config_param(*config);
494 static const u32 reg_drive[4] = { 4, 6, 8, 12 };
495 u32 pull, drive, l1mux;
496 u32 l1, l2, arg = 0;
497
498 if (pin >= ARRAY_SIZE(ipctl->lev1->conf))
499 return -EINVAL;
500
501 l1 = readl(&ipctl->lev1->conf[pin]);
502
503 l1mux = l1 & RZN1_L1_FUNC_MASK;
504 pull = (l1 >> RZN1_L1_PIN_PULL) & 0x3;
505 drive = (l1 >> RZN1_L1_PIN_DRIVE_STRENGTH) & 0x3;
506
507 switch (param) {
508 case PIN_CONFIG_BIAS_PULL_UP:
509 if (pull != RZN1_L1_PIN_PULL_UP)
510 return -EINVAL;
511 break;
512 case PIN_CONFIG_BIAS_PULL_DOWN:
513 if (pull != RZN1_L1_PIN_PULL_DOWN)
514 return -EINVAL;
515 break;
516 case PIN_CONFIG_BIAS_DISABLE:
517 if (pull != RZN1_L1_PIN_PULL_NONE)
518 return -EINVAL;
519 break;
520 case PIN_CONFIG_DRIVE_STRENGTH:
521 arg = reg_drive[drive];
522 break;
523 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
524 l2 = readl(&ipctl->lev2->conf[pin]);
525 if (l1mux == RZN1_L1_FUNCTION_L2) {
526 if (l2 != 0)
527 return -EINVAL;
528 } else if (l1mux != RZN1_FUNC_HIGHZ) {
529 return -EINVAL;
530 }
531 break;
532 default:
533 return -ENOTSUPP;
534 }
535
536 *config = pinconf_to_config_packed(param, arg);
537
538 return 0;
539 }
540
rzn1_pinconf_set(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * configs,unsigned int num_configs)541 static int rzn1_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
542 unsigned long *configs, unsigned int num_configs)
543 {
544 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
545 enum pin_config_param param;
546 unsigned int i;
547 u32 l1, l1_cache;
548 u32 drv;
549 u32 arg;
550
551 if (pin >= ARRAY_SIZE(ipctl->lev1->conf))
552 return -EINVAL;
553
554 l1 = readl(&ipctl->lev1->conf[pin]);
555 l1_cache = l1;
556
557 for (i = 0; i < num_configs; i++) {
558 param = pinconf_to_config_param(configs[i]);
559 arg = pinconf_to_config_argument(configs[i]);
560
561 switch (param) {
562 case PIN_CONFIG_BIAS_PULL_UP:
563 dev_dbg(ipctl->dev, "set pin %d pull up\n", pin);
564 l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
565 l1 |= (RZN1_L1_PIN_PULL_UP << RZN1_L1_PIN_PULL);
566 break;
567 case PIN_CONFIG_BIAS_PULL_DOWN:
568 dev_dbg(ipctl->dev, "set pin %d pull down\n", pin);
569 l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
570 l1 |= (RZN1_L1_PIN_PULL_DOWN << RZN1_L1_PIN_PULL);
571 break;
572 case PIN_CONFIG_BIAS_DISABLE:
573 dev_dbg(ipctl->dev, "set pin %d bias off\n", pin);
574 l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
575 l1 |= (RZN1_L1_PIN_PULL_NONE << RZN1_L1_PIN_PULL);
576 break;
577 case PIN_CONFIG_DRIVE_STRENGTH:
578 dev_dbg(ipctl->dev, "set pin %d drv %umA\n", pin, arg);
579 switch (arg) {
580 case 4:
581 drv = RZN1_L1_PIN_DRIVE_STRENGTH_4MA;
582 break;
583 case 6:
584 drv = RZN1_L1_PIN_DRIVE_STRENGTH_6MA;
585 break;
586 case 8:
587 drv = RZN1_L1_PIN_DRIVE_STRENGTH_8MA;
588 break;
589 case 12:
590 drv = RZN1_L1_PIN_DRIVE_STRENGTH_12MA;
591 break;
592 default:
593 dev_err(ipctl->dev,
594 "Drive strength %umA not supported\n",
595 arg);
596
597 return -EINVAL;
598 }
599
600 l1 &= ~(0x3 << RZN1_L1_PIN_DRIVE_STRENGTH);
601 l1 |= (drv << RZN1_L1_PIN_DRIVE_STRENGTH);
602 break;
603
604 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
605 dev_dbg(ipctl->dev, "set pin %d High-Z\n", pin);
606 l1 &= ~RZN1_L1_FUNC_MASK;
607 l1 |= RZN1_FUNC_HIGHZ;
608 break;
609 default:
610 return -ENOTSUPP;
611 }
612 }
613
614 if (l1 != l1_cache) {
615 rzn1_hw_set_lock(ipctl, LOCK_LEVEL1, LOCK_LEVEL1);
616 writel(l1, &ipctl->lev1->conf[pin]);
617 rzn1_hw_set_lock(ipctl, LOCK_LEVEL1, 0);
618 }
619
620 return 0;
621 }
622
rzn1_pinconf_group_get(struct pinctrl_dev * pctldev,unsigned int selector,unsigned long * config)623 static int rzn1_pinconf_group_get(struct pinctrl_dev *pctldev,
624 unsigned int selector,
625 unsigned long *config)
626 {
627 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
628 struct rzn1_pin_group *grp = &ipctl->groups[selector];
629 unsigned long old = 0;
630 unsigned int i;
631
632 dev_dbg(ipctl->dev, "group get %s selector:%u\n", grp->name, selector);
633
634 for (i = 0; i < grp->npins; i++) {
635 if (rzn1_pinconf_get(pctldev, grp->pins[i], config))
636 return -ENOTSUPP;
637
638 /* configs do not match between two pins */
639 if (i && (old != *config))
640 return -ENOTSUPP;
641
642 old = *config;
643 }
644
645 return 0;
646 }
647
rzn1_pinconf_group_set(struct pinctrl_dev * pctldev,unsigned int selector,unsigned long * configs,unsigned int num_configs)648 static int rzn1_pinconf_group_set(struct pinctrl_dev *pctldev,
649 unsigned int selector,
650 unsigned long *configs,
651 unsigned int num_configs)
652 {
653 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
654 struct rzn1_pin_group *grp = &ipctl->groups[selector];
655 unsigned int i;
656 int ret;
657
658 dev_dbg(ipctl->dev, "group set %s selector:%u configs:%p/%d\n",
659 grp->name, selector, configs, num_configs);
660
661 for (i = 0; i < grp->npins; i++) {
662 unsigned int pin = grp->pins[i];
663
664 ret = rzn1_pinconf_set(pctldev, pin, configs, num_configs);
665 if (ret)
666 return ret;
667 }
668
669 return 0;
670 }
671
672 static const struct pinconf_ops rzn1_pinconf_ops = {
673 .is_generic = true,
674 .pin_config_get = rzn1_pinconf_get,
675 .pin_config_set = rzn1_pinconf_set,
676 .pin_config_group_get = rzn1_pinconf_group_get,
677 .pin_config_group_set = rzn1_pinconf_group_set,
678 .pin_config_config_dbg_show = pinconf_generic_dump_config,
679 };
680
681 static struct pinctrl_desc rzn1_pinctrl_desc = {
682 .pctlops = &rzn1_pctrl_ops,
683 .pmxops = &rzn1_pmx_ops,
684 .confops = &rzn1_pinconf_ops,
685 .owner = THIS_MODULE,
686 };
687
rzn1_pinctrl_parse_groups(struct device_node * np,struct rzn1_pin_group * grp,struct rzn1_pinctrl * ipctl)688 static int rzn1_pinctrl_parse_groups(struct device_node *np,
689 struct rzn1_pin_group *grp,
690 struct rzn1_pinctrl *ipctl)
691 {
692 const __be32 *list;
693 unsigned int i;
694 int size;
695
696 dev_dbg(ipctl->dev, "%s: %s\n", __func__, np->name);
697
698 /* Initialise group */
699 grp->name = np->name;
700
701 /*
702 * The binding format is
703 * pinmux = <PIN_FUNC_ID CONFIG ...>,
704 * do sanity check and calculate pins number
705 */
706 list = of_get_property(np, RZN1_PINS_PROP, &size);
707 if (!list) {
708 dev_err(ipctl->dev,
709 "no " RZN1_PINS_PROP " property in node %pOF\n", np);
710
711 return -EINVAL;
712 }
713
714 if (!size) {
715 dev_err(ipctl->dev, "Invalid " RZN1_PINS_PROP " in node %pOF\n",
716 np);
717
718 return -EINVAL;
719 }
720
721 grp->npins = size / sizeof(list[0]);
722 grp->pin_ids = devm_kmalloc_array(ipctl->dev,
723 grp->npins, sizeof(grp->pin_ids[0]),
724 GFP_KERNEL);
725 grp->pins = devm_kmalloc_array(ipctl->dev,
726 grp->npins, sizeof(grp->pins[0]),
727 GFP_KERNEL);
728 if (!grp->pin_ids || !grp->pins)
729 return -ENOMEM;
730
731 for (i = 0; i < grp->npins; i++) {
732 u32 pin_id = be32_to_cpu(*list++);
733
734 grp->pins[i] = pin_id & 0xff;
735 grp->pin_ids[i] = (pin_id >> 8) & 0x7f;
736 }
737
738 return grp->npins;
739 }
740
rzn1_pinctrl_count_function_groups(struct device_node * np)741 static int rzn1_pinctrl_count_function_groups(struct device_node *np)
742 {
743 struct device_node *child;
744 int count = 0;
745
746 if (of_property_count_u32_elems(np, RZN1_PINS_PROP) > 0)
747 count++;
748
749 for_each_child_of_node(np, child) {
750 if (of_property_count_u32_elems(child, RZN1_PINS_PROP) > 0)
751 count++;
752 }
753
754 return count;
755 }
756
rzn1_pinctrl_parse_functions(struct device_node * np,struct rzn1_pinctrl * ipctl,unsigned int index)757 static int rzn1_pinctrl_parse_functions(struct device_node *np,
758 struct rzn1_pinctrl *ipctl,
759 unsigned int index)
760 {
761 struct rzn1_pmx_func *func;
762 struct rzn1_pin_group *grp;
763 struct device_node *child;
764 unsigned int i = 0;
765 int ret;
766
767 func = &ipctl->functions[index];
768
769 /* Initialise function */
770 func->name = np->name;
771 func->num_groups = rzn1_pinctrl_count_function_groups(np);
772 if (func->num_groups == 0) {
773 dev_err(ipctl->dev, "no groups defined in %pOF\n", np);
774 return -EINVAL;
775 }
776 dev_dbg(ipctl->dev, "function %s has %d groups\n",
777 np->name, func->num_groups);
778
779 func->groups = devm_kmalloc_array(ipctl->dev,
780 func->num_groups, sizeof(char *),
781 GFP_KERNEL);
782 if (!func->groups)
783 return -ENOMEM;
784
785 if (of_property_count_u32_elems(np, RZN1_PINS_PROP) > 0) {
786 func->groups[i] = np->name;
787 grp = &ipctl->groups[ipctl->ngroups];
788 grp->func = func->name;
789 ret = rzn1_pinctrl_parse_groups(np, grp, ipctl);
790 if (ret < 0)
791 return ret;
792 i++;
793 ipctl->ngroups++;
794 }
795
796 for_each_child_of_node(np, child) {
797 func->groups[i] = child->name;
798 grp = &ipctl->groups[ipctl->ngroups];
799 grp->func = func->name;
800 ret = rzn1_pinctrl_parse_groups(child, grp, ipctl);
801 if (ret < 0) {
802 of_node_put(child);
803 return ret;
804 }
805 i++;
806 ipctl->ngroups++;
807 }
808
809 dev_dbg(ipctl->dev, "function %s parsed %u/%u groups\n",
810 np->name, i, func->num_groups);
811
812 return 0;
813 }
814
rzn1_pinctrl_probe_dt(struct platform_device * pdev,struct rzn1_pinctrl * ipctl)815 static int rzn1_pinctrl_probe_dt(struct platform_device *pdev,
816 struct rzn1_pinctrl *ipctl)
817 {
818 struct device_node *np = pdev->dev.of_node;
819 struct device_node *child;
820 unsigned int maxgroups = 0;
821 unsigned int i = 0;
822 int nfuncs = 0;
823 int ret;
824
825 nfuncs = of_get_child_count(np);
826 if (nfuncs <= 0)
827 return 0;
828
829 ipctl->nfunctions = nfuncs;
830 ipctl->functions = devm_kmalloc_array(&pdev->dev, nfuncs,
831 sizeof(*ipctl->functions),
832 GFP_KERNEL);
833 if (!ipctl->functions)
834 return -ENOMEM;
835
836 ipctl->ngroups = 0;
837 for_each_child_of_node(np, child)
838 maxgroups += rzn1_pinctrl_count_function_groups(child);
839
840 ipctl->groups = devm_kmalloc_array(&pdev->dev,
841 maxgroups,
842 sizeof(*ipctl->groups),
843 GFP_KERNEL);
844 if (!ipctl->groups)
845 return -ENOMEM;
846
847 for_each_child_of_node(np, child) {
848 ret = rzn1_pinctrl_parse_functions(child, ipctl, i++);
849 if (ret < 0) {
850 of_node_put(child);
851 return ret;
852 }
853 }
854
855 return 0;
856 }
857
rzn1_pinctrl_probe(struct platform_device * pdev)858 static int rzn1_pinctrl_probe(struct platform_device *pdev)
859 {
860 struct rzn1_pinctrl *ipctl;
861 struct resource *res;
862 int ret;
863
864 /* Create state holders etc for this driver */
865 ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL);
866 if (!ipctl)
867 return -ENOMEM;
868
869 ipctl->mdio_func[0] = -1;
870 ipctl->mdio_func[1] = -1;
871
872 ipctl->lev1 = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
873 if (IS_ERR(ipctl->lev1))
874 return PTR_ERR(ipctl->lev1);
875 ipctl->lev1_protect_phys = (u32)res->start + 0x400;
876
877 ipctl->lev2 = devm_platform_get_and_ioremap_resource(pdev, 1, &res);
878 if (IS_ERR(ipctl->lev2))
879 return PTR_ERR(ipctl->lev2);
880 ipctl->lev2_protect_phys = (u32)res->start + 0x400;
881
882 ipctl->clk = devm_clk_get(&pdev->dev, NULL);
883 if (IS_ERR(ipctl->clk))
884 return PTR_ERR(ipctl->clk);
885 ret = clk_prepare_enable(ipctl->clk);
886 if (ret)
887 return ret;
888
889 ipctl->dev = &pdev->dev;
890 rzn1_pinctrl_desc.name = dev_name(&pdev->dev);
891 rzn1_pinctrl_desc.pins = rzn1_pins;
892 rzn1_pinctrl_desc.npins = ARRAY_SIZE(rzn1_pins);
893
894 ret = rzn1_pinctrl_probe_dt(pdev, ipctl);
895 if (ret) {
896 dev_err(&pdev->dev, "fail to probe dt properties\n");
897 goto err_clk;
898 }
899
900 platform_set_drvdata(pdev, ipctl);
901
902 ret = devm_pinctrl_register_and_init(&pdev->dev, &rzn1_pinctrl_desc,
903 ipctl, &ipctl->pctl);
904 if (ret) {
905 dev_err(&pdev->dev, "could not register rzn1 pinctrl driver\n");
906 goto err_clk;
907 }
908
909 ret = pinctrl_enable(ipctl->pctl);
910 if (ret)
911 goto err_clk;
912
913 dev_info(&pdev->dev, "probed\n");
914
915 return 0;
916
917 err_clk:
918 clk_disable_unprepare(ipctl->clk);
919
920 return ret;
921 }
922
rzn1_pinctrl_remove(struct platform_device * pdev)923 static int rzn1_pinctrl_remove(struct platform_device *pdev)
924 {
925 struct rzn1_pinctrl *ipctl = platform_get_drvdata(pdev);
926
927 clk_disable_unprepare(ipctl->clk);
928
929 return 0;
930 }
931
932 static const struct of_device_id rzn1_pinctrl_match[] = {
933 { .compatible = "renesas,rzn1-pinctrl", },
934 { /* sentinel */ }
935 };
936 MODULE_DEVICE_TABLE(of, rzn1_pinctrl_match);
937
938 static struct platform_driver rzn1_pinctrl_driver = {
939 .probe = rzn1_pinctrl_probe,
940 .remove = rzn1_pinctrl_remove,
941 .driver = {
942 .name = "rzn1-pinctrl",
943 .of_match_table = rzn1_pinctrl_match,
944 },
945 };
946
_pinctrl_drv_register(void)947 static int __init _pinctrl_drv_register(void)
948 {
949 return platform_driver_register(&rzn1_pinctrl_driver);
950 }
951 subsys_initcall(_pinctrl_drv_register);
952
953 MODULE_AUTHOR("Phil Edworthy <phil.edworthy@renesas.com>");
954 MODULE_DESCRIPTION("Renesas RZ/N1 pinctrl driver");
955