1 /*
2 * Copyright (C) 2015-2016 Socionext Inc.
3 * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8 #include <common.h>
9 #include <dm.h>
10 #include <linux/io.h>
11 #include <linux/err.h>
12 #include <linux/sizes.h>
13 #include <dm/pinctrl.h>
14
15 #include "pinctrl-uniphier.h"
16
17 #define UNIPHIER_PINCTRL_PINMUX_BASE 0x1000
18 #define UNIPHIER_PINCTRL_LOAD_PINMUX 0x1700
19 #define UNIPHIER_PINCTRL_PUPDCTRL_BASE 0x1a00
20 #define UNIPHIER_PINCTRL_IECTRL 0x1d00
21
22 static const char *uniphier_pinctrl_dummy_name = "_dummy";
23
uniphier_pinctrl_get_groups_count(struct udevice * dev)24 static int uniphier_pinctrl_get_groups_count(struct udevice *dev)
25 {
26 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
27
28 return priv->socdata->groups_count;
29 }
30
uniphier_pinctrl_get_group_name(struct udevice * dev,unsigned selector)31 static const char *uniphier_pinctrl_get_group_name(struct udevice *dev,
32 unsigned selector)
33 {
34 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
35
36 if (!priv->socdata->groups[selector].name)
37 return uniphier_pinctrl_dummy_name;
38
39 return priv->socdata->groups[selector].name;
40 }
41
uniphier_pinmux_get_functions_count(struct udevice * dev)42 static int uniphier_pinmux_get_functions_count(struct udevice *dev)
43 {
44 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
45
46 return priv->socdata->functions_count;
47 }
48
uniphier_pinmux_get_function_name(struct udevice * dev,unsigned selector)49 static const char *uniphier_pinmux_get_function_name(struct udevice *dev,
50 unsigned selector)
51 {
52 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
53
54 if (!priv->socdata->functions[selector])
55 return uniphier_pinctrl_dummy_name;
56
57 return priv->socdata->functions[selector];
58 }
59
uniphier_pinconf_input_enable_perpin(struct udevice * dev,unsigned int pin,int enable)60 static int uniphier_pinconf_input_enable_perpin(struct udevice *dev,
61 unsigned int pin, int enable)
62 {
63 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
64 unsigned reg;
65 u32 mask, tmp;
66
67 reg = UNIPHIER_PINCTRL_IECTRL + pin / 32 * 4;
68 mask = BIT(pin % 32);
69
70 tmp = readl(priv->base + reg);
71 if (enable)
72 tmp |= mask;
73 else
74 tmp &= ~mask;
75 writel(tmp, priv->base + reg);
76
77 return 0;
78 }
79
uniphier_pinconf_input_enable_legacy(struct udevice * dev,unsigned int pin,int enable)80 static int uniphier_pinconf_input_enable_legacy(struct udevice *dev,
81 unsigned int pin, int enable)
82 {
83 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
84 int pins_count = priv->socdata->pins_count;
85 const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
86 int i;
87
88 /*
89 * Multiple pins share one input enable, per-pin disabling is
90 * impossible.
91 */
92 if (!enable)
93 return -EINVAL;
94
95 for (i = 0; i < pins_count; i++) {
96 if (pins[i].number == pin) {
97 unsigned int iectrl;
98 u32 tmp;
99
100 iectrl = uniphier_pin_get_iectrl(pins[i].data);
101 tmp = readl(priv->base + UNIPHIER_PINCTRL_IECTRL);
102 tmp |= 1 << iectrl;
103 writel(tmp, priv->base + UNIPHIER_PINCTRL_IECTRL);
104 }
105 }
106
107 return 0;
108 }
109
uniphier_pinconf_input_enable(struct udevice * dev,unsigned int pin,int enable)110 static int uniphier_pinconf_input_enable(struct udevice *dev,
111 unsigned int pin, int enable)
112 {
113 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
114
115 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL)
116 return uniphier_pinconf_input_enable_perpin(dev, pin, enable);
117 else
118 return uniphier_pinconf_input_enable_legacy(dev, pin, enable);
119 }
120
121 #if CONFIG_IS_ENABLED(PINCONF)
122
123 static const struct pinconf_param uniphier_pinconf_params[] = {
124 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
125 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
126 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
127 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
128 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
129 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
130 };
131
uniphier_pinconf_bias_set(struct udevice * dev,unsigned int pin,unsigned int param,unsigned int arg)132 static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin,
133 unsigned int param, unsigned int arg)
134 {
135 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
136 unsigned int enable = 1;
137 unsigned int reg;
138 u32 mask, tmp;
139
140 if (!(priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE))
141 return -ENOTSUPP;
142
143 switch (param) {
144 case PIN_CONFIG_BIAS_DISABLE:
145 enable = 0;
146 break;
147 case PIN_CONFIG_BIAS_PULL_UP:
148 case PIN_CONFIG_BIAS_PULL_DOWN:
149 if (arg == 0) /* total bias is not supported */
150 return -EINVAL;
151 break;
152 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
153 if (arg == 0) /* configuration ignored */
154 return 0;
155 default:
156 BUG();
157 }
158
159 reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pin / 32 * 4;
160 mask = BIT(pin % 32);
161
162 tmp = readl(priv->base + reg);
163 if (enable)
164 tmp |= mask;
165 else
166 tmp &= ~mask;
167 writel(tmp, priv->base + reg);
168
169 return 0;
170 }
171
uniphier_pinconf_set_one(struct udevice * dev,unsigned int pin,unsigned int param,unsigned int arg)172 static int uniphier_pinconf_set_one(struct udevice *dev, unsigned int pin,
173 unsigned int param, unsigned int arg)
174 {
175 int ret;
176
177 switch (param) {
178 case PIN_CONFIG_BIAS_DISABLE:
179 case PIN_CONFIG_BIAS_PULL_UP:
180 case PIN_CONFIG_BIAS_PULL_DOWN:
181 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
182 ret = uniphier_pinconf_bias_set(dev, pin, param, arg);
183 break;
184 case PIN_CONFIG_INPUT_ENABLE:
185 ret = uniphier_pinconf_input_enable(dev, pin, arg);
186 break;
187 default:
188 printf("unsupported configuration parameter %u\n", param);
189 return -EINVAL;
190 }
191
192 return ret;
193 }
194
uniphier_pinconf_group_set(struct udevice * dev,unsigned int group_selector,unsigned int param,unsigned int arg)195 static int uniphier_pinconf_group_set(struct udevice *dev,
196 unsigned int group_selector,
197 unsigned int param, unsigned int arg)
198 {
199 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
200 const struct uniphier_pinctrl_group *grp =
201 &priv->socdata->groups[group_selector];
202 int i, ret;
203
204 for (i = 0; i < grp->num_pins; i++) {
205 ret = uniphier_pinconf_set_one(dev, grp->pins[i], param, arg);
206 if (ret)
207 return ret;
208 }
209
210 return 0;
211 }
212
213 #endif /* CONFIG_IS_ENABLED(PINCONF) */
214
uniphier_pinmux_set_one(struct udevice * dev,unsigned pin,int muxval)215 static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin,
216 int muxval)
217 {
218 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
219 unsigned reg, reg_end, shift, mask;
220 unsigned mux_bits = 8;
221 unsigned reg_stride = 4;
222 bool load_pinctrl = false;
223 u32 tmp;
224
225 /* some pins need input-enabling */
226 uniphier_pinconf_input_enable(dev, pin, 1);
227
228 if (muxval < 0)
229 return; /* dedicated pin; nothing to do for pin-mux */
230
231 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_MUX_4BIT)
232 mux_bits = 4;
233
234 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE) {
235 /*
236 * Mode offset bit
237 * Normal 4 * n shift+3:shift
238 * Debug 4 * n shift+7:shift+4
239 */
240 mux_bits /= 2;
241 reg_stride = 8;
242 load_pinctrl = true;
243 }
244
245 reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride;
246 reg_end = reg + reg_stride;
247 shift = pin * mux_bits % 32;
248 mask = (1U << mux_bits) - 1;
249
250 /*
251 * If reg_stride is greater than 4, the MSB of each pinsel shall be
252 * stored in the offset+4.
253 */
254 for (; reg < reg_end; reg += 4) {
255 tmp = readl(priv->base + reg);
256 tmp &= ~(mask << shift);
257 tmp |= (mask & muxval) << shift;
258 writel(tmp, priv->base + reg);
259
260 muxval >>= mux_bits;
261 }
262
263 if (load_pinctrl)
264 writel(1, priv->base + UNIPHIER_PINCTRL_LOAD_PINMUX);
265 }
266
uniphier_pinmux_group_set(struct udevice * dev,unsigned group_selector,unsigned func_selector)267 static int uniphier_pinmux_group_set(struct udevice *dev,
268 unsigned group_selector,
269 unsigned func_selector)
270 {
271 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
272 const struct uniphier_pinctrl_group *grp =
273 &priv->socdata->groups[group_selector];
274 int i;
275
276 for (i = 0; i < grp->num_pins; i++)
277 uniphier_pinmux_set_one(dev, grp->pins[i], grp->muxvals[i]);
278
279 return 0;
280 }
281
282 const struct pinctrl_ops uniphier_pinctrl_ops = {
283 .get_groups_count = uniphier_pinctrl_get_groups_count,
284 .get_group_name = uniphier_pinctrl_get_group_name,
285 .get_functions_count = uniphier_pinmux_get_functions_count,
286 .get_function_name = uniphier_pinmux_get_function_name,
287 .pinmux_group_set = uniphier_pinmux_group_set,
288 #if CONFIG_IS_ENABLED(PINCONF)
289 .pinconf_num_params = ARRAY_SIZE(uniphier_pinconf_params),
290 .pinconf_params = uniphier_pinconf_params,
291 .pinconf_group_set = uniphier_pinconf_group_set,
292 #endif
293 .set_state = pinctrl_generic_set_state,
294 };
295
uniphier_pinctrl_probe(struct udevice * dev,struct uniphier_pinctrl_socdata * socdata)296 int uniphier_pinctrl_probe(struct udevice *dev,
297 struct uniphier_pinctrl_socdata *socdata)
298 {
299 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
300 fdt_addr_t addr;
301
302 addr = devfdt_get_addr(dev->parent);
303 if (addr == FDT_ADDR_T_NONE)
304 return -EINVAL;
305
306 priv->base = devm_ioremap(dev, addr, SZ_4K);
307 if (!priv->base)
308 return -ENOMEM;
309
310 priv->socdata = socdata;
311
312 return 0;
313 }
314