1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/pinctrl/pinmux-falcon.c
4 * based on linux/drivers/pinctrl/pinmux-pxa910.c
5 *
6 * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
7 * Copyright (C) 2012 John Crispin <john@phrozen.org>
8 */
9
10 #include <linux/gpio/driver.h>
11 #include <linux/interrupt.h>
12 #include <linux/slab.h>
13 #include <linux/export.h>
14 #include <linux/err.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/of_platform.h>
18 #include <linux/of_address.h>
19 #include <linux/of_gpio.h>
20 #include <linux/platform_device.h>
21
22 #include "pinctrl-lantiq.h"
23
24 #include <lantiq_soc.h>
25
26 /* Multiplexer Control Register */
27 #define LTQ_PADC_MUX(x) (x * 0x4)
28 /* Pull Up Enable Register */
29 #define LTQ_PADC_PUEN 0x80
30 /* Pull Down Enable Register */
31 #define LTQ_PADC_PDEN 0x84
32 /* Slew Rate Control Register */
33 #define LTQ_PADC_SRC 0x88
34 /* Drive Current Control Register */
35 #define LTQ_PADC_DCC 0x8C
36 /* Pad Control Availability Register */
37 #define LTQ_PADC_AVAIL 0xF0
38
39 #define pad_r32(p, reg) ltq_r32(p + reg)
40 #define pad_w32(p, val, reg) ltq_w32(val, p + reg)
41 #define pad_w32_mask(c, clear, set, reg) \
42 pad_w32(c, (pad_r32(c, reg) & ~(clear)) | (set), reg)
43
44 #define pad_getbit(m, r, p) (!!(ltq_r32(m + r) & (1 << p)))
45
46 #define PORTS 5
47 #define PINS 32
48 #define PORT(x) (x / PINS)
49 #define PORT_PIN(x) (x % PINS)
50
51 #define MFP_FALCON(a, f0, f1, f2, f3) \
52 { \
53 .name = #a, \
54 .pin = a, \
55 .func = { \
56 FALCON_MUX_##f0, \
57 FALCON_MUX_##f1, \
58 FALCON_MUX_##f2, \
59 FALCON_MUX_##f3, \
60 }, \
61 }
62
63 #define GRP_MUX(a, m, p) \
64 { \
65 .name = a, \
66 .mux = FALCON_MUX_##m, \
67 .pins = p, \
68 .npins = ARRAY_SIZE(p), \
69 }
70
71 enum falcon_mux {
72 FALCON_MUX_GPIO = 0,
73 FALCON_MUX_RST,
74 FALCON_MUX_NTR,
75 FALCON_MUX_PPS,
76 FALCON_MUX_MDIO,
77 FALCON_MUX_LED,
78 FALCON_MUX_SPI,
79 FALCON_MUX_ASC,
80 FALCON_MUX_I2C,
81 FALCON_MUX_HOSTIF,
82 FALCON_MUX_SLIC,
83 FALCON_MUX_JTAG,
84 FALCON_MUX_PCM,
85 FALCON_MUX_MII,
86 FALCON_MUX_PHY,
87 FALCON_MUX_NONE = 0xffff,
88 };
89
90 static struct pinctrl_pin_desc falcon_pads[PORTS * PINS];
91 static int pad_count[PORTS];
92
lantiq_load_pin_desc(struct pinctrl_pin_desc * d,int bank,int len)93 static void lantiq_load_pin_desc(struct pinctrl_pin_desc *d, int bank, int len)
94 {
95 int base = bank * PINS;
96 int i;
97
98 for (i = 0; i < len; i++) {
99 d[i].number = base + i;
100 d[i].name = kasprintf(GFP_KERNEL, "io%d", base + i);
101 }
102 pad_count[bank] = len;
103 }
104
105 static struct ltq_mfp_pin falcon_mfp[] = {
106 /* pin f0 f1 f2 f3 */
107 MFP_FALCON(GPIO0, RST, GPIO, NONE, NONE),
108 MFP_FALCON(GPIO1, GPIO, GPIO, NONE, NONE),
109 MFP_FALCON(GPIO2, GPIO, GPIO, NONE, NONE),
110 MFP_FALCON(GPIO3, GPIO, GPIO, NONE, NONE),
111 MFP_FALCON(GPIO4, NTR, GPIO, NONE, NONE),
112 MFP_FALCON(GPIO5, NTR, GPIO, PPS, NONE),
113 MFP_FALCON(GPIO6, RST, GPIO, NONE, NONE),
114 MFP_FALCON(GPIO7, MDIO, GPIO, NONE, NONE),
115 MFP_FALCON(GPIO8, MDIO, GPIO, NONE, NONE),
116 MFP_FALCON(GPIO9, LED, GPIO, NONE, NONE),
117 MFP_FALCON(GPIO10, LED, GPIO, NONE, NONE),
118 MFP_FALCON(GPIO11, LED, GPIO, NONE, NONE),
119 MFP_FALCON(GPIO12, LED, GPIO, NONE, NONE),
120 MFP_FALCON(GPIO13, LED, GPIO, NONE, NONE),
121 MFP_FALCON(GPIO14, LED, GPIO, NONE, NONE),
122 MFP_FALCON(GPIO32, ASC, GPIO, NONE, NONE),
123 MFP_FALCON(GPIO33, ASC, GPIO, NONE, NONE),
124 MFP_FALCON(GPIO34, SPI, GPIO, NONE, NONE),
125 MFP_FALCON(GPIO35, SPI, GPIO, NONE, NONE),
126 MFP_FALCON(GPIO36, SPI, GPIO, NONE, NONE),
127 MFP_FALCON(GPIO37, SPI, GPIO, NONE, NONE),
128 MFP_FALCON(GPIO38, SPI, GPIO, NONE, NONE),
129 MFP_FALCON(GPIO39, I2C, GPIO, NONE, NONE),
130 MFP_FALCON(GPIO40, I2C, GPIO, NONE, NONE),
131 MFP_FALCON(GPIO41, HOSTIF, GPIO, HOSTIF, JTAG),
132 MFP_FALCON(GPIO42, HOSTIF, GPIO, HOSTIF, NONE),
133 MFP_FALCON(GPIO43, SLIC, GPIO, NONE, NONE),
134 MFP_FALCON(GPIO44, SLIC, GPIO, PCM, ASC),
135 MFP_FALCON(GPIO45, SLIC, GPIO, PCM, ASC),
136 MFP_FALCON(GPIO64, MII, GPIO, NONE, NONE),
137 MFP_FALCON(GPIO65, MII, GPIO, NONE, NONE),
138 MFP_FALCON(GPIO66, MII, GPIO, NONE, NONE),
139 MFP_FALCON(GPIO67, MII, GPIO, NONE, NONE),
140 MFP_FALCON(GPIO68, MII, GPIO, NONE, NONE),
141 MFP_FALCON(GPIO69, MII, GPIO, NONE, NONE),
142 MFP_FALCON(GPIO70, MII, GPIO, NONE, NONE),
143 MFP_FALCON(GPIO71, MII, GPIO, NONE, NONE),
144 MFP_FALCON(GPIO72, MII, GPIO, NONE, NONE),
145 MFP_FALCON(GPIO73, MII, GPIO, NONE, NONE),
146 MFP_FALCON(GPIO74, MII, GPIO, NONE, NONE),
147 MFP_FALCON(GPIO75, MII, GPIO, NONE, NONE),
148 MFP_FALCON(GPIO76, MII, GPIO, NONE, NONE),
149 MFP_FALCON(GPIO77, MII, GPIO, NONE, NONE),
150 MFP_FALCON(GPIO78, MII, GPIO, NONE, NONE),
151 MFP_FALCON(GPIO79, MII, GPIO, NONE, NONE),
152 MFP_FALCON(GPIO80, MII, GPIO, NONE, NONE),
153 MFP_FALCON(GPIO81, MII, GPIO, NONE, NONE),
154 MFP_FALCON(GPIO82, MII, GPIO, NONE, NONE),
155 MFP_FALCON(GPIO83, MII, GPIO, NONE, NONE),
156 MFP_FALCON(GPIO84, MII, GPIO, NONE, NONE),
157 MFP_FALCON(GPIO85, MII, GPIO, NONE, NONE),
158 MFP_FALCON(GPIO86, MII, GPIO, NONE, NONE),
159 MFP_FALCON(GPIO87, MII, GPIO, NONE, NONE),
160 MFP_FALCON(GPIO88, PHY, GPIO, NONE, NONE),
161 };
162
163 static const unsigned pins_por[] = {GPIO0};
164 static const unsigned pins_ntr[] = {GPIO4};
165 static const unsigned pins_ntr8k[] = {GPIO5};
166 static const unsigned pins_pps[] = {GPIO5};
167 static const unsigned pins_hrst[] = {GPIO6};
168 static const unsigned pins_mdio[] = {GPIO7, GPIO8};
169 static const unsigned pins_bled[] = {GPIO9, GPIO10, GPIO11,
170 GPIO12, GPIO13, GPIO14};
171 static const unsigned pins_asc0[] = {GPIO32, GPIO33};
172 static const unsigned pins_spi[] = {GPIO34, GPIO35, GPIO36};
173 static const unsigned pins_spi_cs0[] = {GPIO37};
174 static const unsigned pins_spi_cs1[] = {GPIO38};
175 static const unsigned pins_i2c[] = {GPIO39, GPIO40};
176 static const unsigned pins_jtag[] = {GPIO41};
177 static const unsigned pins_slic[] = {GPIO43, GPIO44, GPIO45};
178 static const unsigned pins_pcm[] = {GPIO44, GPIO45};
179 static const unsigned pins_asc1[] = {GPIO44, GPIO45};
180
181 static struct ltq_pin_group falcon_grps[] = {
182 GRP_MUX("por", RST, pins_por),
183 GRP_MUX("ntr", NTR, pins_ntr),
184 GRP_MUX("ntr8k", NTR, pins_ntr8k),
185 GRP_MUX("pps", PPS, pins_pps),
186 GRP_MUX("hrst", RST, pins_hrst),
187 GRP_MUX("mdio", MDIO, pins_mdio),
188 GRP_MUX("bootled", LED, pins_bled),
189 GRP_MUX("asc0", ASC, pins_asc0),
190 GRP_MUX("spi", SPI, pins_spi),
191 GRP_MUX("spi cs0", SPI, pins_spi_cs0),
192 GRP_MUX("spi cs1", SPI, pins_spi_cs1),
193 GRP_MUX("i2c", I2C, pins_i2c),
194 GRP_MUX("jtag", JTAG, pins_jtag),
195 GRP_MUX("slic", SLIC, pins_slic),
196 GRP_MUX("pcm", PCM, pins_pcm),
197 GRP_MUX("asc1", ASC, pins_asc1),
198 };
199
200 static const char * const ltq_rst_grps[] = {"por", "hrst"};
201 static const char * const ltq_ntr_grps[] = {"ntr", "ntr8k", "pps"};
202 static const char * const ltq_mdio_grps[] = {"mdio"};
203 static const char * const ltq_bled_grps[] = {"bootled"};
204 static const char * const ltq_asc_grps[] = {"asc0", "asc1"};
205 static const char * const ltq_spi_grps[] = {"spi", "spi cs0", "spi cs1"};
206 static const char * const ltq_i2c_grps[] = {"i2c"};
207 static const char * const ltq_jtag_grps[] = {"jtag"};
208 static const char * const ltq_slic_grps[] = {"slic"};
209 static const char * const ltq_pcm_grps[] = {"pcm"};
210
211 static struct ltq_pmx_func falcon_funcs[] = {
212 {"rst", ARRAY_AND_SIZE(ltq_rst_grps)},
213 {"ntr", ARRAY_AND_SIZE(ltq_ntr_grps)},
214 {"mdio", ARRAY_AND_SIZE(ltq_mdio_grps)},
215 {"led", ARRAY_AND_SIZE(ltq_bled_grps)},
216 {"asc", ARRAY_AND_SIZE(ltq_asc_grps)},
217 {"spi", ARRAY_AND_SIZE(ltq_spi_grps)},
218 {"i2c", ARRAY_AND_SIZE(ltq_i2c_grps)},
219 {"jtag", ARRAY_AND_SIZE(ltq_jtag_grps)},
220 {"slic", ARRAY_AND_SIZE(ltq_slic_grps)},
221 {"pcm", ARRAY_AND_SIZE(ltq_pcm_grps)},
222 };
223
224
225
226
227 /* --------- pinconf related code --------- */
falcon_pinconf_group_get(struct pinctrl_dev * pctrldev,unsigned group,unsigned long * config)228 static int falcon_pinconf_group_get(struct pinctrl_dev *pctrldev,
229 unsigned group, unsigned long *config)
230 {
231 return -ENOTSUPP;
232 }
233
falcon_pinconf_group_set(struct pinctrl_dev * pctrldev,unsigned group,unsigned long * configs,unsigned num_configs)234 static int falcon_pinconf_group_set(struct pinctrl_dev *pctrldev,
235 unsigned group, unsigned long *configs,
236 unsigned num_configs)
237 {
238 return -ENOTSUPP;
239 }
240
falcon_pinconf_get(struct pinctrl_dev * pctrldev,unsigned pin,unsigned long * config)241 static int falcon_pinconf_get(struct pinctrl_dev *pctrldev,
242 unsigned pin, unsigned long *config)
243 {
244 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
245 enum ltq_pinconf_param param = LTQ_PINCONF_UNPACK_PARAM(*config);
246 void __iomem *mem = info->membase[PORT(pin)];
247
248 switch (param) {
249 case LTQ_PINCONF_PARAM_DRIVE_CURRENT:
250 *config = LTQ_PINCONF_PACK(param,
251 !!pad_getbit(mem, LTQ_PADC_DCC, PORT_PIN(pin)));
252 break;
253
254 case LTQ_PINCONF_PARAM_SLEW_RATE:
255 *config = LTQ_PINCONF_PACK(param,
256 !!pad_getbit(mem, LTQ_PADC_SRC, PORT_PIN(pin)));
257 break;
258
259 case LTQ_PINCONF_PARAM_PULL:
260 if (pad_getbit(mem, LTQ_PADC_PDEN, PORT_PIN(pin)))
261 *config = LTQ_PINCONF_PACK(param, 1);
262 else if (pad_getbit(mem, LTQ_PADC_PUEN, PORT_PIN(pin)))
263 *config = LTQ_PINCONF_PACK(param, 2);
264 else
265 *config = LTQ_PINCONF_PACK(param, 0);
266
267 break;
268
269 default:
270 return -ENOTSUPP;
271 }
272
273 return 0;
274 }
275
falcon_pinconf_set(struct pinctrl_dev * pctrldev,unsigned pin,unsigned long * configs,unsigned num_configs)276 static int falcon_pinconf_set(struct pinctrl_dev *pctrldev,
277 unsigned pin, unsigned long *configs,
278 unsigned num_configs)
279 {
280 enum ltq_pinconf_param param;
281 int arg;
282 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
283 void __iomem *mem = info->membase[PORT(pin)];
284 u32 reg;
285 int i;
286
287 for (i = 0; i < num_configs; i++) {
288 param = LTQ_PINCONF_UNPACK_PARAM(configs[i]);
289 arg = LTQ_PINCONF_UNPACK_ARG(configs[i]);
290
291 switch (param) {
292 case LTQ_PINCONF_PARAM_DRIVE_CURRENT:
293 reg = LTQ_PADC_DCC;
294 break;
295
296 case LTQ_PINCONF_PARAM_SLEW_RATE:
297 reg = LTQ_PADC_SRC;
298 break;
299
300 case LTQ_PINCONF_PARAM_PULL:
301 if (arg == 1)
302 reg = LTQ_PADC_PDEN;
303 else
304 reg = LTQ_PADC_PUEN;
305 break;
306
307 default:
308 pr_err("%s: Invalid config param %04x\n",
309 pinctrl_dev_get_name(pctrldev), param);
310 return -ENOTSUPP;
311 }
312
313 pad_w32(mem, BIT(PORT_PIN(pin)), reg);
314 if (!(pad_r32(mem, reg) & BIT(PORT_PIN(pin))))
315 return -ENOTSUPP;
316 } /* for each config */
317
318 return 0;
319 }
320
falcon_pinconf_dbg_show(struct pinctrl_dev * pctrldev,struct seq_file * s,unsigned offset)321 static void falcon_pinconf_dbg_show(struct pinctrl_dev *pctrldev,
322 struct seq_file *s, unsigned offset)
323 {
324 unsigned long config;
325 struct pin_desc *desc;
326
327 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
328 int port = PORT(offset);
329
330 seq_printf(s, " (port %d) mux %d -- ", port,
331 pad_r32(info->membase[port], LTQ_PADC_MUX(PORT_PIN(offset))));
332
333 config = LTQ_PINCONF_PACK(LTQ_PINCONF_PARAM_PULL, 0);
334 if (!falcon_pinconf_get(pctrldev, offset, &config))
335 seq_printf(s, "pull %d ",
336 (int)LTQ_PINCONF_UNPACK_ARG(config));
337
338 config = LTQ_PINCONF_PACK(LTQ_PINCONF_PARAM_DRIVE_CURRENT, 0);
339 if (!falcon_pinconf_get(pctrldev, offset, &config))
340 seq_printf(s, "drive-current %d ",
341 (int)LTQ_PINCONF_UNPACK_ARG(config));
342
343 config = LTQ_PINCONF_PACK(LTQ_PINCONF_PARAM_SLEW_RATE, 0);
344 if (!falcon_pinconf_get(pctrldev, offset, &config))
345 seq_printf(s, "slew-rate %d ",
346 (int)LTQ_PINCONF_UNPACK_ARG(config));
347
348 desc = pin_desc_get(pctrldev, offset);
349 if (desc) {
350 if (desc->gpio_owner)
351 seq_printf(s, " owner: %s", desc->gpio_owner);
352 } else {
353 seq_printf(s, " not registered");
354 }
355 }
356
falcon_pinconf_group_dbg_show(struct pinctrl_dev * pctrldev,struct seq_file * s,unsigned selector)357 static void falcon_pinconf_group_dbg_show(struct pinctrl_dev *pctrldev,
358 struct seq_file *s, unsigned selector)
359 {
360 }
361
362 static const struct pinconf_ops falcon_pinconf_ops = {
363 .pin_config_get = falcon_pinconf_get,
364 .pin_config_set = falcon_pinconf_set,
365 .pin_config_group_get = falcon_pinconf_group_get,
366 .pin_config_group_set = falcon_pinconf_group_set,
367 .pin_config_dbg_show = falcon_pinconf_dbg_show,
368 .pin_config_group_dbg_show = falcon_pinconf_group_dbg_show,
369 };
370
371 static struct pinctrl_desc falcon_pctrl_desc = {
372 .owner = THIS_MODULE,
373 .pins = falcon_pads,
374 .confops = &falcon_pinconf_ops,
375 };
376
falcon_mux_apply(struct pinctrl_dev * pctrldev,int mfp,int mux)377 static inline int falcon_mux_apply(struct pinctrl_dev *pctrldev,
378 int mfp, int mux)
379 {
380 struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
381 int port = PORT(info->mfp[mfp].pin);
382
383 if ((port >= PORTS) || (!info->membase[port]))
384 return -ENODEV;
385
386 pad_w32(info->membase[port], mux,
387 LTQ_PADC_MUX(PORT_PIN(info->mfp[mfp].pin)));
388 return 0;
389 }
390
391 static const struct ltq_cfg_param falcon_cfg_params[] = {
392 {"lantiq,pull", LTQ_PINCONF_PARAM_PULL},
393 {"lantiq,drive-current", LTQ_PINCONF_PARAM_DRIVE_CURRENT},
394 {"lantiq,slew-rate", LTQ_PINCONF_PARAM_SLEW_RATE},
395 };
396
397 static struct ltq_pinmux_info falcon_info = {
398 .desc = &falcon_pctrl_desc,
399 .apply_mux = falcon_mux_apply,
400 .params = falcon_cfg_params,
401 .num_params = ARRAY_SIZE(falcon_cfg_params),
402 };
403
404
405
406
407 /* --------- register the pinctrl layer --------- */
408
pinctrl_falcon_get_range_size(int id)409 int pinctrl_falcon_get_range_size(int id)
410 {
411 u32 avail;
412
413 if ((id >= PORTS) || (!falcon_info.membase[id]))
414 return -EINVAL;
415
416 avail = pad_r32(falcon_info.membase[id], LTQ_PADC_AVAIL);
417
418 return fls(avail);
419 }
420
pinctrl_falcon_add_gpio_range(struct pinctrl_gpio_range * range)421 void pinctrl_falcon_add_gpio_range(struct pinctrl_gpio_range *range)
422 {
423 pinctrl_add_gpio_range(falcon_info.pctrl, range);
424 }
425
pinctrl_falcon_probe(struct platform_device * pdev)426 static int pinctrl_falcon_probe(struct platform_device *pdev)
427 {
428 struct device_node *np;
429 int pad_count = 0;
430 int ret = 0;
431
432 /* load and remap the pad resources of the different banks */
433 for_each_compatible_node(np, NULL, "lantiq,pad-falcon") {
434 struct platform_device *ppdev = of_find_device_by_node(np);
435 const __be32 *bank = of_get_property(np, "lantiq,bank", NULL);
436 struct resource res;
437 u32 avail;
438 int pins;
439
440 if (!of_device_is_available(np))
441 continue;
442
443 if (!ppdev) {
444 dev_err(&pdev->dev, "failed to find pad pdev\n");
445 continue;
446 }
447 if (!bank || *bank >= PORTS)
448 continue;
449 if (of_address_to_resource(np, 0, &res))
450 continue;
451 falcon_info.clk[*bank] = clk_get(&ppdev->dev, NULL);
452 if (IS_ERR(falcon_info.clk[*bank])) {
453 dev_err(&ppdev->dev, "failed to get clock\n");
454 of_node_put(np)
455 return PTR_ERR(falcon_info.clk[*bank]);
456 }
457 falcon_info.membase[*bank] = devm_ioremap_resource(&pdev->dev,
458 &res);
459 if (IS_ERR(falcon_info.membase[*bank])) {
460 of_node_put(np);
461 return PTR_ERR(falcon_info.membase[*bank]);
462 }
463
464 avail = pad_r32(falcon_info.membase[*bank],
465 LTQ_PADC_AVAIL);
466 pins = fls(avail);
467 lantiq_load_pin_desc(&falcon_pads[pad_count], *bank, pins);
468 pad_count += pins;
469 clk_enable(falcon_info.clk[*bank]);
470 dev_dbg(&pdev->dev, "found %s with %d pads\n",
471 res.name, pins);
472 }
473 dev_dbg(&pdev->dev, "found a total of %d pads\n", pad_count);
474 falcon_pctrl_desc.name = dev_name(&pdev->dev);
475 falcon_pctrl_desc.npins = pad_count;
476
477 falcon_info.mfp = falcon_mfp;
478 falcon_info.num_mfp = ARRAY_SIZE(falcon_mfp);
479 falcon_info.grps = falcon_grps;
480 falcon_info.num_grps = ARRAY_SIZE(falcon_grps);
481 falcon_info.funcs = falcon_funcs;
482 falcon_info.num_funcs = ARRAY_SIZE(falcon_funcs);
483
484 ret = ltq_pinctrl_register(pdev, &falcon_info);
485 if (!ret)
486 dev_info(&pdev->dev, "Init done\n");
487 return ret;
488 }
489
490 static const struct of_device_id falcon_match[] = {
491 { .compatible = "lantiq,pinctrl-falcon" },
492 {},
493 };
494 MODULE_DEVICE_TABLE(of, falcon_match);
495
496 static struct platform_driver pinctrl_falcon_driver = {
497 .probe = pinctrl_falcon_probe,
498 .driver = {
499 .name = "pinctrl-falcon",
500 .of_match_table = falcon_match,
501 },
502 };
503
pinctrl_falcon_init(void)504 int __init pinctrl_falcon_init(void)
505 {
506 return platform_driver_register(&pinctrl_falcon_driver);
507 }
508
509 core_initcall_sync(pinctrl_falcon_init);
510
