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 int ret;
408
409 *map = NULL;
410 *num_maps = 0;
411
412 ret = rzn1_dt_node_to_map_one(pctldev, np, map, num_maps);
413 if (ret < 0)
414 return ret;
415
416 for_each_child_of_node_scoped(np, child) {
417 ret = rzn1_dt_node_to_map_one(pctldev, child, map, num_maps);
418 if (ret < 0)
419 return ret;
420 }
421
422 return 0;
423 }
424
425 static const struct pinctrl_ops rzn1_pctrl_ops = {
426 .get_groups_count = rzn1_get_groups_count,
427 .get_group_name = rzn1_get_group_name,
428 .get_group_pins = rzn1_get_group_pins,
429 .dt_node_to_map = rzn1_dt_node_to_map,
430 .dt_free_map = pinctrl_utils_free_map,
431 };
432
rzn1_pmx_get_funcs_count(struct pinctrl_dev * pctldev)433 static int rzn1_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
434 {
435 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
436
437 return ipctl->nfunctions;
438 }
439
rzn1_pmx_get_func_name(struct pinctrl_dev * pctldev,unsigned int selector)440 static const char *rzn1_pmx_get_func_name(struct pinctrl_dev *pctldev,
441 unsigned int selector)
442 {
443 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
444
445 return ipctl->functions[selector].name;
446 }
447
rzn1_pmx_get_groups(struct pinctrl_dev * pctldev,unsigned int selector,const char * const ** groups,unsigned int * const num_groups)448 static int rzn1_pmx_get_groups(struct pinctrl_dev *pctldev,
449 unsigned int selector,
450 const char * const **groups,
451 unsigned int * const num_groups)
452 {
453 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
454
455 *groups = ipctl->functions[selector].groups;
456 *num_groups = ipctl->functions[selector].num_groups;
457
458 return 0;
459 }
460
rzn1_set_mux(struct pinctrl_dev * pctldev,unsigned int selector,unsigned int group)461 static int rzn1_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
462 unsigned int group)
463 {
464 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
465 struct rzn1_pin_group *grp = &ipctl->groups[group];
466 unsigned int i, grp_pins = grp->npins;
467
468 dev_dbg(ipctl->dev, "set mux %s(%d) group %s(%d)\n",
469 ipctl->functions[selector].name, selector, grp->name, group);
470
471 rzn1_hw_set_lock(ipctl, LOCK_ALL, LOCK_ALL);
472 for (i = 0; i < grp_pins; i++)
473 rzn1_set_hw_pin_func(ipctl, grp->pins[i], grp->pin_ids[i], 0);
474 rzn1_hw_set_lock(ipctl, LOCK_ALL, 0);
475
476 return 0;
477 }
478
479 static const struct pinmux_ops rzn1_pmx_ops = {
480 .get_functions_count = rzn1_pmx_get_funcs_count,
481 .get_function_name = rzn1_pmx_get_func_name,
482 .get_function_groups = rzn1_pmx_get_groups,
483 .set_mux = rzn1_set_mux,
484 };
485
rzn1_pinconf_get(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * config)486 static int rzn1_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
487 unsigned long *config)
488 {
489 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
490 enum pin_config_param param = pinconf_to_config_param(*config);
491 static const u32 reg_drive[4] = { 4, 6, 8, 12 };
492 u32 pull, drive, l1mux;
493 u32 l1, l2, arg = 0;
494
495 if (pin >= ARRAY_SIZE(ipctl->lev1->conf))
496 return -EINVAL;
497
498 l1 = readl(&ipctl->lev1->conf[pin]);
499
500 l1mux = l1 & RZN1_L1_FUNC_MASK;
501 pull = (l1 >> RZN1_L1_PIN_PULL) & 0x3;
502 drive = (l1 >> RZN1_L1_PIN_DRIVE_STRENGTH) & 0x3;
503
504 switch (param) {
505 case PIN_CONFIG_BIAS_PULL_UP:
506 if (pull != RZN1_L1_PIN_PULL_UP)
507 return -EINVAL;
508 break;
509 case PIN_CONFIG_BIAS_PULL_DOWN:
510 if (pull != RZN1_L1_PIN_PULL_DOWN)
511 return -EINVAL;
512 break;
513 case PIN_CONFIG_BIAS_DISABLE:
514 if (pull != RZN1_L1_PIN_PULL_NONE)
515 return -EINVAL;
516 break;
517 case PIN_CONFIG_DRIVE_STRENGTH:
518 arg = reg_drive[drive];
519 break;
520 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
521 l2 = readl(&ipctl->lev2->conf[pin]);
522 if (l1mux == RZN1_L1_FUNCTION_L2) {
523 if (l2 != 0)
524 return -EINVAL;
525 } else if (l1mux != RZN1_FUNC_HIGHZ) {
526 return -EINVAL;
527 }
528 break;
529 default:
530 return -ENOTSUPP;
531 }
532
533 *config = pinconf_to_config_packed(param, arg);
534
535 return 0;
536 }
537
rzn1_pinconf_set(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * configs,unsigned int num_configs)538 static int rzn1_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
539 unsigned long *configs, unsigned int num_configs)
540 {
541 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
542 enum pin_config_param param;
543 unsigned int i;
544 u32 l1, l1_cache;
545 u32 drv;
546 u32 arg;
547
548 if (pin >= ARRAY_SIZE(ipctl->lev1->conf))
549 return -EINVAL;
550
551 l1 = readl(&ipctl->lev1->conf[pin]);
552 l1_cache = l1;
553
554 for (i = 0; i < num_configs; i++) {
555 param = pinconf_to_config_param(configs[i]);
556 arg = pinconf_to_config_argument(configs[i]);
557
558 switch (param) {
559 case PIN_CONFIG_BIAS_PULL_UP:
560 dev_dbg(ipctl->dev, "set pin %d pull up\n", pin);
561 l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
562 l1 |= (RZN1_L1_PIN_PULL_UP << RZN1_L1_PIN_PULL);
563 break;
564 case PIN_CONFIG_BIAS_PULL_DOWN:
565 dev_dbg(ipctl->dev, "set pin %d pull down\n", pin);
566 l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
567 l1 |= (RZN1_L1_PIN_PULL_DOWN << RZN1_L1_PIN_PULL);
568 break;
569 case PIN_CONFIG_BIAS_DISABLE:
570 dev_dbg(ipctl->dev, "set pin %d bias off\n", pin);
571 l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
572 l1 |= (RZN1_L1_PIN_PULL_NONE << RZN1_L1_PIN_PULL);
573 break;
574 case PIN_CONFIG_DRIVE_STRENGTH:
575 dev_dbg(ipctl->dev, "set pin %d drv %umA\n", pin, arg);
576 switch (arg) {
577 case 4:
578 drv = RZN1_L1_PIN_DRIVE_STRENGTH_4MA;
579 break;
580 case 6:
581 drv = RZN1_L1_PIN_DRIVE_STRENGTH_6MA;
582 break;
583 case 8:
584 drv = RZN1_L1_PIN_DRIVE_STRENGTH_8MA;
585 break;
586 case 12:
587 drv = RZN1_L1_PIN_DRIVE_STRENGTH_12MA;
588 break;
589 default:
590 dev_err(ipctl->dev,
591 "Drive strength %umA not supported\n",
592 arg);
593
594 return -EINVAL;
595 }
596
597 l1 &= ~(0x3 << RZN1_L1_PIN_DRIVE_STRENGTH);
598 l1 |= (drv << RZN1_L1_PIN_DRIVE_STRENGTH);
599 break;
600
601 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
602 dev_dbg(ipctl->dev, "set pin %d High-Z\n", pin);
603 l1 &= ~RZN1_L1_FUNC_MASK;
604 l1 |= RZN1_FUNC_HIGHZ;
605 break;
606 default:
607 return -ENOTSUPP;
608 }
609 }
610
611 if (l1 != l1_cache) {
612 rzn1_hw_set_lock(ipctl, LOCK_LEVEL1, LOCK_LEVEL1);
613 writel(l1, &ipctl->lev1->conf[pin]);
614 rzn1_hw_set_lock(ipctl, LOCK_LEVEL1, 0);
615 }
616
617 return 0;
618 }
619
rzn1_pinconf_group_get(struct pinctrl_dev * pctldev,unsigned int selector,unsigned long * config)620 static int rzn1_pinconf_group_get(struct pinctrl_dev *pctldev,
621 unsigned int selector,
622 unsigned long *config)
623 {
624 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
625 struct rzn1_pin_group *grp = &ipctl->groups[selector];
626 unsigned long old = 0;
627 unsigned int i;
628
629 dev_dbg(ipctl->dev, "group get %s selector:%u\n", grp->name, selector);
630
631 for (i = 0; i < grp->npins; i++) {
632 if (rzn1_pinconf_get(pctldev, grp->pins[i], config))
633 return -ENOTSUPP;
634
635 /* configs do not match between two pins */
636 if (i && (old != *config))
637 return -ENOTSUPP;
638
639 old = *config;
640 }
641
642 return 0;
643 }
644
rzn1_pinconf_group_set(struct pinctrl_dev * pctldev,unsigned int selector,unsigned long * configs,unsigned int num_configs)645 static int rzn1_pinconf_group_set(struct pinctrl_dev *pctldev,
646 unsigned int selector,
647 unsigned long *configs,
648 unsigned int num_configs)
649 {
650 struct rzn1_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
651 struct rzn1_pin_group *grp = &ipctl->groups[selector];
652 unsigned int i;
653 int ret;
654
655 dev_dbg(ipctl->dev, "group set %s selector:%u configs:%p/%d\n",
656 grp->name, selector, configs, num_configs);
657
658 for (i = 0; i < grp->npins; i++) {
659 unsigned int pin = grp->pins[i];
660
661 ret = rzn1_pinconf_set(pctldev, pin, configs, num_configs);
662 if (ret)
663 return ret;
664 }
665
666 return 0;
667 }
668
669 static const struct pinconf_ops rzn1_pinconf_ops = {
670 .is_generic = true,
671 .pin_config_get = rzn1_pinconf_get,
672 .pin_config_set = rzn1_pinconf_set,
673 .pin_config_group_get = rzn1_pinconf_group_get,
674 .pin_config_group_set = rzn1_pinconf_group_set,
675 .pin_config_config_dbg_show = pinconf_generic_dump_config,
676 };
677
678 static struct pinctrl_desc rzn1_pinctrl_desc = {
679 .pctlops = &rzn1_pctrl_ops,
680 .pmxops = &rzn1_pmx_ops,
681 .confops = &rzn1_pinconf_ops,
682 .owner = THIS_MODULE,
683 };
684
rzn1_pinctrl_parse_groups(struct device_node * np,struct rzn1_pin_group * grp,struct rzn1_pinctrl * ipctl)685 static int rzn1_pinctrl_parse_groups(struct device_node *np,
686 struct rzn1_pin_group *grp,
687 struct rzn1_pinctrl *ipctl)
688 {
689 const __be32 *list;
690 unsigned int i;
691 int size;
692
693 dev_dbg(ipctl->dev, "%s: %s\n", __func__, np->name);
694
695 /* Initialise group */
696 grp->name = np->name;
697
698 /*
699 * The binding format is
700 * pinmux = <PIN_FUNC_ID CONFIG ...>,
701 * do sanity check and calculate pins number
702 */
703 list = of_get_property(np, RZN1_PINS_PROP, &size);
704 if (!list) {
705 dev_err(ipctl->dev,
706 "no " RZN1_PINS_PROP " property in node %pOF\n", np);
707
708 return -EINVAL;
709 }
710
711 if (!size) {
712 dev_err(ipctl->dev, "Invalid " RZN1_PINS_PROP " in node %pOF\n",
713 np);
714
715 return -EINVAL;
716 }
717
718 grp->npins = size / sizeof(list[0]);
719 grp->pin_ids = devm_kmalloc_array(ipctl->dev,
720 grp->npins, sizeof(grp->pin_ids[0]),
721 GFP_KERNEL);
722 grp->pins = devm_kmalloc_array(ipctl->dev,
723 grp->npins, sizeof(grp->pins[0]),
724 GFP_KERNEL);
725 if (!grp->pin_ids || !grp->pins)
726 return -ENOMEM;
727
728 for (i = 0; i < grp->npins; i++) {
729 u32 pin_id = be32_to_cpu(*list++);
730
731 grp->pins[i] = pin_id & 0xff;
732 grp->pin_ids[i] = (pin_id >> 8) & 0x7f;
733 }
734
735 return grp->npins;
736 }
737
rzn1_pinctrl_count_function_groups(struct device_node * np)738 static int rzn1_pinctrl_count_function_groups(struct device_node *np)
739 {
740 int count = 0;
741
742 if (of_property_count_u32_elems(np, RZN1_PINS_PROP) > 0)
743 count++;
744
745 for_each_child_of_node_scoped(np, child) {
746 if (of_property_count_u32_elems(child, RZN1_PINS_PROP) > 0)
747 count++;
748 }
749
750 return count;
751 }
752
rzn1_pinctrl_parse_functions(struct device_node * np,struct rzn1_pinctrl * ipctl,unsigned int index)753 static int rzn1_pinctrl_parse_functions(struct device_node *np,
754 struct rzn1_pinctrl *ipctl,
755 unsigned int index)
756 {
757 struct rzn1_pmx_func *func;
758 struct rzn1_pin_group *grp;
759 unsigned int i = 0;
760 int ret;
761
762 func = &ipctl->functions[index];
763
764 /* Initialise function */
765 func->name = np->name;
766 func->num_groups = rzn1_pinctrl_count_function_groups(np);
767 if (func->num_groups == 0) {
768 dev_err(ipctl->dev, "no groups defined in %pOF\n", np);
769 return -EINVAL;
770 }
771 dev_dbg(ipctl->dev, "function %s has %d groups\n",
772 np->name, func->num_groups);
773
774 func->groups = devm_kmalloc_array(ipctl->dev,
775 func->num_groups, sizeof(char *),
776 GFP_KERNEL);
777 if (!func->groups)
778 return -ENOMEM;
779
780 if (of_property_count_u32_elems(np, RZN1_PINS_PROP) > 0) {
781 func->groups[i] = np->name;
782 grp = &ipctl->groups[ipctl->ngroups];
783 grp->func = func->name;
784 ret = rzn1_pinctrl_parse_groups(np, grp, ipctl);
785 if (ret < 0)
786 return ret;
787 i++;
788 ipctl->ngroups++;
789 }
790
791 for_each_child_of_node_scoped(np, child) {
792 func->groups[i] = child->name;
793 grp = &ipctl->groups[ipctl->ngroups];
794 grp->func = func->name;
795 ret = rzn1_pinctrl_parse_groups(child, grp, ipctl);
796 if (ret < 0)
797 return ret;
798 i++;
799 ipctl->ngroups++;
800 }
801
802 dev_dbg(ipctl->dev, "function %s parsed %u/%u groups\n",
803 np->name, i, func->num_groups);
804
805 return 0;
806 }
807
rzn1_pinctrl_probe_dt(struct platform_device * pdev,struct rzn1_pinctrl * ipctl)808 static int rzn1_pinctrl_probe_dt(struct platform_device *pdev,
809 struct rzn1_pinctrl *ipctl)
810 {
811 struct device_node *np = pdev->dev.of_node;
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_scoped(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_scoped(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
rzn1_pinctrl_probe(struct platform_device * pdev)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 ipctl->lev1 = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
863 if (IS_ERR(ipctl->lev1))
864 return PTR_ERR(ipctl->lev1);
865 ipctl->lev1_protect_phys = (u32)res->start + 0x400;
866
867 ipctl->lev2 = devm_platform_get_and_ioremap_resource(pdev, 1, &res);
868 if (IS_ERR(ipctl->lev2))
869 return PTR_ERR(ipctl->lev2);
870 ipctl->lev2_protect_phys = (u32)res->start + 0x400;
871
872 ipctl->clk = devm_clk_get(&pdev->dev, NULL);
873 if (IS_ERR(ipctl->clk))
874 return PTR_ERR(ipctl->clk);
875 ret = clk_prepare_enable(ipctl->clk);
876 if (ret)
877 return ret;
878
879 ipctl->dev = &pdev->dev;
880 rzn1_pinctrl_desc.name = dev_name(&pdev->dev);
881 rzn1_pinctrl_desc.pins = rzn1_pins;
882 rzn1_pinctrl_desc.npins = ARRAY_SIZE(rzn1_pins);
883
884 ret = rzn1_pinctrl_probe_dt(pdev, ipctl);
885 if (ret) {
886 dev_err(&pdev->dev, "fail to probe dt properties\n");
887 goto err_clk;
888 }
889
890 platform_set_drvdata(pdev, ipctl);
891
892 ret = devm_pinctrl_register_and_init(&pdev->dev, &rzn1_pinctrl_desc,
893 ipctl, &ipctl->pctl);
894 if (ret) {
895 dev_err(&pdev->dev, "could not register rzn1 pinctrl driver\n");
896 goto err_clk;
897 }
898
899 ret = pinctrl_enable(ipctl->pctl);
900 if (ret)
901 goto err_clk;
902
903 dev_info(&pdev->dev, "probed\n");
904
905 return 0;
906
907 err_clk:
908 clk_disable_unprepare(ipctl->clk);
909
910 return ret;
911 }
912
rzn1_pinctrl_remove(struct platform_device * pdev)913 static void rzn1_pinctrl_remove(struct platform_device *pdev)
914 {
915 struct rzn1_pinctrl *ipctl = platform_get_drvdata(pdev);
916
917 clk_disable_unprepare(ipctl->clk);
918 }
919
920 static const struct of_device_id rzn1_pinctrl_match[] = {
921 { .compatible = "renesas,rzn1-pinctrl", },
922 { /* sentinel */ }
923 };
924 MODULE_DEVICE_TABLE(of, rzn1_pinctrl_match);
925
926 static struct platform_driver rzn1_pinctrl_driver = {
927 .probe = rzn1_pinctrl_probe,
928 .remove = rzn1_pinctrl_remove,
929 .driver = {
930 .name = "rzn1-pinctrl",
931 .of_match_table = rzn1_pinctrl_match,
932 },
933 };
934
_pinctrl_drv_register(void)935 static int __init _pinctrl_drv_register(void)
936 {
937 return platform_driver_register(&rzn1_pinctrl_driver);
938 }
939 subsys_initcall(_pinctrl_drv_register);
940
941 MODULE_AUTHOR("Phil Edworthy <phil.edworthy@renesas.com>");
942 MODULE_DESCRIPTION("Renesas RZ/N1 pinctrl driver");
943