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7#include <common.h>
8#include <dm.h>
9#include <dm/device_compat.h>
10#include <linux/bitops.h>
11#include <linux/bug.h>
12#include <linux/io.h>
13#include <linux/err.h>
14#include <linux/kernel.h>
15#include <linux/sizes.h>
16#include <dm/pinctrl.h>
17
18#include "pinctrl-uniphier.h"
19
20#define UNIPHIER_PINCTRL_PINMUX_BASE 0x1000
21#define UNIPHIER_PINCTRL_LOAD_PINMUX 0x1700
22#define UNIPHIER_PINCTRL_DRVCTRL_BASE 0x1800
23#define UNIPHIER_PINCTRL_DRV2CTRL_BASE 0x1900
24#define UNIPHIER_PINCTRL_DRV3CTRL_BASE 0x1980
25#define UNIPHIER_PINCTRL_PUPDCTRL_BASE 0x1a00
26#define UNIPHIER_PINCTRL_IECTRL 0x1d00
27
28static const char *uniphier_pinctrl_dummy_name = "_dummy";
29
30static int uniphier_pinctrl_get_pins_count(struct udevice *dev)
31{
32 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
33 const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
34 int pins_count = priv->socdata->pins_count;
35
36
37
38
39
40 return pins[pins_count - 1].number + 1;
41}
42
43static const char *uniphier_pinctrl_get_pin_name(struct udevice *dev,
44 unsigned int selector)
45{
46 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
47 const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
48 int pins_count = priv->socdata->pins_count;
49 int i;
50
51 for (i = 0; i < pins_count; i++)
52 if (pins[i].number == selector)
53 return pins[i].name;
54
55 return uniphier_pinctrl_dummy_name;
56}
57
58static int uniphier_pinctrl_get_groups_count(struct udevice *dev)
59{
60 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
61
62 return priv->socdata->groups_count;
63}
64
65static const char *uniphier_pinctrl_get_group_name(struct udevice *dev,
66 unsigned selector)
67{
68 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
69
70 if (!priv->socdata->groups[selector].name)
71 return uniphier_pinctrl_dummy_name;
72
73 return priv->socdata->groups[selector].name;
74}
75
76static int uniphier_pinmux_get_functions_count(struct udevice *dev)
77{
78 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
79
80 return priv->socdata->functions_count;
81}
82
83static const char *uniphier_pinmux_get_function_name(struct udevice *dev,
84 unsigned selector)
85{
86 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
87
88 if (!priv->socdata->functions[selector])
89 return uniphier_pinctrl_dummy_name;
90
91 return priv->socdata->functions[selector];
92}
93
94static int uniphier_pinconf_input_enable_perpin(struct udevice *dev,
95 unsigned int pin, int enable)
96{
97 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
98 unsigned reg;
99 u32 mask, tmp;
100
101 reg = UNIPHIER_PINCTRL_IECTRL + pin / 32 * 4;
102 mask = BIT(pin % 32);
103
104 tmp = readl(priv->base + reg);
105 if (enable)
106 tmp |= mask;
107 else
108 tmp &= ~mask;
109 writel(tmp, priv->base + reg);
110
111 return 0;
112}
113
114static int uniphier_pinconf_input_enable_legacy(struct udevice *dev,
115 unsigned int pin, int enable)
116{
117 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
118
119
120
121
122
123 if (!enable)
124 return -EINVAL;
125
126
127 writel(U32_MAX, priv->base + UNIPHIER_PINCTRL_IECTRL);
128
129 return 0;
130}
131
132static int uniphier_pinconf_input_enable(struct udevice *dev,
133 unsigned int pin, int enable)
134{
135 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
136
137 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL)
138 return uniphier_pinconf_input_enable_perpin(dev, pin, enable);
139 else
140 return uniphier_pinconf_input_enable_legacy(dev, pin, enable);
141}
142
143#if CONFIG_IS_ENABLED(PINCONF)
144
145static const struct pinconf_param uniphier_pinconf_params[] = {
146 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
147 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
148 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
149 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
150 { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
151 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
152 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
153};
154
155static const struct uniphier_pinctrl_pin *
156uniphier_pinctrl_pin_get(struct uniphier_pinctrl_priv *priv, unsigned int pin)
157{
158 const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
159 int pins_count = priv->socdata->pins_count;
160 int i;
161
162 for (i = 0; i < pins_count; i++)
163 if (pins[i].number == pin)
164 return &pins[i];
165
166 return NULL;
167}
168
169static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin,
170 unsigned int param, unsigned int arg)
171{
172 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
173 unsigned int enable = 1;
174 unsigned int reg;
175 u32 mask, tmp;
176
177 if (!(priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE))
178 return -ENOTSUPP;
179
180 switch (param) {
181 case PIN_CONFIG_BIAS_DISABLE:
182 enable = 0;
183 break;
184 case PIN_CONFIG_BIAS_PULL_UP:
185 case PIN_CONFIG_BIAS_PULL_DOWN:
186 if (arg == 0)
187 return -EINVAL;
188 break;
189 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
190 if (arg == 0)
191 return 0;
192 default:
193 BUG();
194 }
195
196 reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pin / 32 * 4;
197 mask = BIT(pin % 32);
198
199 tmp = readl(priv->base + reg);
200 if (enable)
201 tmp |= mask;
202 else
203 tmp &= ~mask;
204 writel(tmp, priv->base + reg);
205
206 return 0;
207}
208
209static const unsigned int uniphier_pinconf_drv_strengths_1bit[] = {
210 4, 8,
211};
212
213static const unsigned int uniphier_pinconf_drv_strengths_2bit[] = {
214 8, 12, 16, 20,
215};
216
217static const unsigned int uniphier_pinconf_drv_strengths_3bit[] = {
218 4, 5, 7, 9, 11, 12, 14, 16,
219};
220
221static int uniphier_pinconf_drive_set(struct udevice *dev, unsigned int pin,
222 unsigned int strength)
223{
224 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
225 const struct uniphier_pinctrl_pin *desc;
226 const unsigned int *strengths;
227 unsigned int base, stride, width, drvctrl, reg, shift;
228 u32 val, mask, tmp;
229
230 desc = uniphier_pinctrl_pin_get(priv, pin);
231 if (WARN_ON(!desc))
232 return -EINVAL;
233
234 switch (uniphier_pin_get_drv_type(desc->data)) {
235 case UNIPHIER_PIN_DRV_1BIT:
236 strengths = uniphier_pinconf_drv_strengths_1bit;
237 base = UNIPHIER_PINCTRL_DRVCTRL_BASE;
238 stride = 1;
239 width = 1;
240 break;
241 case UNIPHIER_PIN_DRV_2BIT:
242 strengths = uniphier_pinconf_drv_strengths_2bit;
243 base = UNIPHIER_PINCTRL_DRV2CTRL_BASE;
244 stride = 2;
245 width = 2;
246 break;
247 case UNIPHIER_PIN_DRV_3BIT:
248 strengths = uniphier_pinconf_drv_strengths_3bit;
249 base = UNIPHIER_PINCTRL_DRV3CTRL_BASE;
250 stride = 4;
251 width = 3;
252 break;
253 default:
254
255 return -EINVAL;
256 }
257
258 drvctrl = uniphier_pin_get_drvctrl(desc->data);
259 drvctrl *= stride;
260
261 reg = base + drvctrl / 32 * 4;
262 shift = drvctrl % 32;
263 mask = (1U << width) - 1;
264
265 for (val = 0; val <= mask; val++) {
266 if (strengths[val] > strength)
267 break;
268 }
269
270 if (val == 0) {
271 dev_err(dev, "unsupported drive strength %u mA for pin %s\n",
272 strength, desc->name);
273 return -EINVAL;
274 }
275
276 if (!mask)
277 return 0;
278
279 val--;
280
281 tmp = readl(priv->base + reg);
282 tmp &= ~(mask << shift);
283 tmp |= (mask & val) << shift;
284 writel(tmp, priv->base + reg);
285
286 return 0;
287}
288
289static int uniphier_pinconf_set(struct udevice *dev, unsigned int pin,
290 unsigned int param, unsigned int arg)
291{
292 int ret;
293
294 switch (param) {
295 case PIN_CONFIG_BIAS_DISABLE:
296 case PIN_CONFIG_BIAS_PULL_UP:
297 case PIN_CONFIG_BIAS_PULL_DOWN:
298 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
299 ret = uniphier_pinconf_bias_set(dev, pin, param, arg);
300 break;
301 case PIN_CONFIG_DRIVE_STRENGTH:
302 ret = uniphier_pinconf_drive_set(dev, pin, arg);
303 break;
304 case PIN_CONFIG_INPUT_ENABLE:
305 ret = uniphier_pinconf_input_enable(dev, pin, arg);
306 break;
307 default:
308 dev_err(dev, "unsupported configuration parameter %u\n", param);
309 return -EINVAL;
310 }
311
312 return ret;
313}
314
315static int uniphier_pinconf_group_set(struct udevice *dev,
316 unsigned int group_selector,
317 unsigned int param, unsigned int arg)
318{
319 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
320 const struct uniphier_pinctrl_group *grp =
321 &priv->socdata->groups[group_selector];
322 int i, ret;
323
324 for (i = 0; i < grp->num_pins; i++) {
325 ret = uniphier_pinconf_set(dev, grp->pins[i], param, arg);
326 if (ret)
327 return ret;
328 }
329
330 return 0;
331}
332
333#endif
334
335static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin,
336 int muxval)
337{
338 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
339 unsigned reg, reg_end, shift, mask;
340 unsigned mux_bits = 8;
341 unsigned reg_stride = 4;
342 bool load_pinctrl = false;
343 u32 tmp;
344
345
346 uniphier_pinconf_input_enable(dev, pin, 1);
347
348 if (muxval < 0)
349 return;
350
351 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_MUX_4BIT)
352 mux_bits = 4;
353
354 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE) {
355
356
357
358
359
360 mux_bits /= 2;
361 reg_stride = 8;
362 load_pinctrl = true;
363 }
364
365 reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride;
366 reg_end = reg + reg_stride;
367 shift = pin * mux_bits % 32;
368 mask = (1U << mux_bits) - 1;
369
370
371
372
373
374 for (; reg < reg_end; reg += 4) {
375 tmp = readl(priv->base + reg);
376 tmp &= ~(mask << shift);
377 tmp |= (mask & muxval) << shift;
378 writel(tmp, priv->base + reg);
379
380 muxval >>= mux_bits;
381 }
382
383 if (load_pinctrl)
384 writel(1, priv->base + UNIPHIER_PINCTRL_LOAD_PINMUX);
385}
386
387static int uniphier_pinmux_group_set(struct udevice *dev,
388 unsigned group_selector,
389 unsigned func_selector)
390{
391 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
392 const struct uniphier_pinctrl_group *grp =
393 &priv->socdata->groups[group_selector];
394 int i;
395
396 for (i = 0; i < grp->num_pins; i++)
397 uniphier_pinmux_set_one(dev, grp->pins[i], grp->muxvals[i]);
398
399 return 0;
400}
401
402const struct pinctrl_ops uniphier_pinctrl_ops = {
403 .get_pins_count = uniphier_pinctrl_get_pins_count,
404 .get_pin_name = uniphier_pinctrl_get_pin_name,
405 .get_groups_count = uniphier_pinctrl_get_groups_count,
406 .get_group_name = uniphier_pinctrl_get_group_name,
407 .get_functions_count = uniphier_pinmux_get_functions_count,
408 .get_function_name = uniphier_pinmux_get_function_name,
409 .pinmux_group_set = uniphier_pinmux_group_set,
410#if CONFIG_IS_ENABLED(PINCONF)
411 .pinconf_num_params = ARRAY_SIZE(uniphier_pinconf_params),
412 .pinconf_params = uniphier_pinconf_params,
413 .pinconf_set = uniphier_pinconf_set,
414 .pinconf_group_set = uniphier_pinconf_group_set,
415#endif
416 .set_state = pinctrl_generic_set_state,
417};
418
419int uniphier_pinctrl_probe(struct udevice *dev,
420 struct uniphier_pinctrl_socdata *socdata)
421{
422 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
423 fdt_addr_t addr;
424
425 addr = dev_read_addr(dev->parent);
426 if (addr == FDT_ADDR_T_NONE)
427 return -EINVAL;
428
429 priv->base = devm_ioremap(dev, addr, SZ_4K);
430 if (!priv->base)
431 return -ENOMEM;
432
433 priv->socdata = socdata;
434
435 return 0;
436}
437
