1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2015-2016 Socionext Inc.
4 * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
10 #include <linux/err.h>
11 #include <linux/kernel.h>
12 #include <linux/sizes.h>
13 #include <dm/pinctrl.h>
15 #include "pinctrl-uniphier.h"
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
22 static const char *uniphier_pinctrl_dummy_name = "_dummy";
24 static int uniphier_pinctrl_get_groups_count(struct udevice *dev)
26 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
28 return priv->socdata->groups_count;
31 static const char *uniphier_pinctrl_get_group_name(struct udevice *dev,
34 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
36 if (!priv->socdata->groups[selector].name)
37 return uniphier_pinctrl_dummy_name;
39 return priv->socdata->groups[selector].name;
42 static int uniphier_pinmux_get_functions_count(struct udevice *dev)
44 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
46 return priv->socdata->functions_count;
49 static const char *uniphier_pinmux_get_function_name(struct udevice *dev,
52 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
54 if (!priv->socdata->functions[selector])
55 return uniphier_pinctrl_dummy_name;
57 return priv->socdata->functions[selector];
60 static int uniphier_pinconf_input_enable_perpin(struct udevice *dev,
61 unsigned int pin, int enable)
63 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
67 reg = UNIPHIER_PINCTRL_IECTRL + pin / 32 * 4;
70 tmp = readl(priv->base + reg);
75 writel(tmp, priv->base + reg);
80 static int uniphier_pinconf_input_enable_legacy(struct udevice *dev,
81 unsigned int pin, int enable)
83 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
86 * Multiple pins share one input enable, per-pin disabling is
92 /* Set all bits instead of having a bunch of pin data */
93 writel(U32_MAX, priv->base + UNIPHIER_PINCTRL_IECTRL);
98 static int uniphier_pinconf_input_enable(struct udevice *dev,
99 unsigned int pin, int enable)
101 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
103 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL)
104 return uniphier_pinconf_input_enable_perpin(dev, pin, enable);
106 return uniphier_pinconf_input_enable_legacy(dev, pin, enable);
109 #if CONFIG_IS_ENABLED(PINCONF)
111 static const struct pinconf_param uniphier_pinconf_params[] = {
112 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
113 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
114 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
115 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
116 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
117 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
120 static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin,
121 unsigned int param, unsigned int arg)
123 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
124 unsigned int enable = 1;
128 if (!(priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE))
132 case PIN_CONFIG_BIAS_DISABLE:
135 case PIN_CONFIG_BIAS_PULL_UP:
136 case PIN_CONFIG_BIAS_PULL_DOWN:
137 if (arg == 0) /* total bias is not supported */
140 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
141 if (arg == 0) /* configuration ignored */
147 reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pin / 32 * 4;
148 mask = BIT(pin % 32);
150 tmp = readl(priv->base + reg);
155 writel(tmp, priv->base + reg);
160 static int uniphier_pinconf_set_one(struct udevice *dev, unsigned int pin,
161 unsigned int param, unsigned int arg)
166 case PIN_CONFIG_BIAS_DISABLE:
167 case PIN_CONFIG_BIAS_PULL_UP:
168 case PIN_CONFIG_BIAS_PULL_DOWN:
169 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
170 ret = uniphier_pinconf_bias_set(dev, pin, param, arg);
172 case PIN_CONFIG_INPUT_ENABLE:
173 ret = uniphier_pinconf_input_enable(dev, pin, arg);
176 dev_err(dev, "unsupported configuration parameter %u\n", param);
183 static int uniphier_pinconf_group_set(struct udevice *dev,
184 unsigned int group_selector,
185 unsigned int param, unsigned int arg)
187 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
188 const struct uniphier_pinctrl_group *grp =
189 &priv->socdata->groups[group_selector];
192 for (i = 0; i < grp->num_pins; i++) {
193 ret = uniphier_pinconf_set_one(dev, grp->pins[i], param, arg);
201 #endif /* CONFIG_IS_ENABLED(PINCONF) */
203 static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin,
206 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
207 unsigned reg, reg_end, shift, mask;
208 unsigned mux_bits = 8;
209 unsigned reg_stride = 4;
210 bool load_pinctrl = false;
213 /* some pins need input-enabling */
214 uniphier_pinconf_input_enable(dev, pin, 1);
217 return; /* dedicated pin; nothing to do for pin-mux */
219 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_MUX_4BIT)
222 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE) {
225 * Normal 4 * n shift+3:shift
226 * Debug 4 * n shift+7:shift+4
233 reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride;
234 reg_end = reg + reg_stride;
235 shift = pin * mux_bits % 32;
236 mask = (1U << mux_bits) - 1;
239 * If reg_stride is greater than 4, the MSB of each pinsel shall be
240 * stored in the offset+4.
242 for (; reg < reg_end; reg += 4) {
243 tmp = readl(priv->base + reg);
244 tmp &= ~(mask << shift);
245 tmp |= (mask & muxval) << shift;
246 writel(tmp, priv->base + reg);
252 writel(1, priv->base + UNIPHIER_PINCTRL_LOAD_PINMUX);
255 static int uniphier_pinmux_group_set(struct udevice *dev,
256 unsigned group_selector,
257 unsigned func_selector)
259 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
260 const struct uniphier_pinctrl_group *grp =
261 &priv->socdata->groups[group_selector];
264 for (i = 0; i < grp->num_pins; i++)
265 uniphier_pinmux_set_one(dev, grp->pins[i], grp->muxvals[i]);
270 const struct pinctrl_ops uniphier_pinctrl_ops = {
271 .get_groups_count = uniphier_pinctrl_get_groups_count,
272 .get_group_name = uniphier_pinctrl_get_group_name,
273 .get_functions_count = uniphier_pinmux_get_functions_count,
274 .get_function_name = uniphier_pinmux_get_function_name,
275 .pinmux_group_set = uniphier_pinmux_group_set,
276 #if CONFIG_IS_ENABLED(PINCONF)
277 .pinconf_num_params = ARRAY_SIZE(uniphier_pinconf_params),
278 .pinconf_params = uniphier_pinconf_params,
279 .pinconf_group_set = uniphier_pinconf_group_set,
281 .set_state = pinctrl_generic_set_state,
284 int uniphier_pinctrl_probe(struct udevice *dev,
285 struct uniphier_pinctrl_socdata *socdata)
287 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
290 addr = devfdt_get_addr(dev->parent);
291 if (addr == FDT_ADDR_T_NONE)
294 priv->base = devm_ioremap(dev, addr, SZ_4K);
298 priv->socdata = socdata;