1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2016 - Beniamino Galvani <b.galvani@gmail.com>
10 #include <dm/device-internal.h>
11 #include <dm/device_compat.h>
13 #include <dm/pinctrl.h>
14 #include <fdt_support.h>
15 #include <linux/err.h>
17 #include <linux/libfdt.h>
18 #include <linux/sizes.h>
21 #include "pinctrl-meson.h"
23 DECLARE_GLOBAL_DATA_PTR;
25 static const char *meson_pinctrl_dummy_name = "_dummy";
27 static char pin_name[PINNAME_SIZE];
29 int meson_pinctrl_get_groups_count(struct udevice *dev)
31 struct meson_pinctrl *priv = dev_get_priv(dev);
33 return priv->data->num_groups;
36 const char *meson_pinctrl_get_group_name(struct udevice *dev,
37 unsigned int selector)
39 struct meson_pinctrl *priv = dev_get_priv(dev);
41 if (!priv->data->groups[selector].name)
42 return meson_pinctrl_dummy_name;
44 return priv->data->groups[selector].name;
47 int meson_pinctrl_get_pins_count(struct udevice *dev)
49 struct meson_pinctrl *priv = dev_get_priv(dev);
51 return priv->data->num_pins;
54 const char *meson_pinctrl_get_pin_name(struct udevice *dev,
55 unsigned int selector)
57 struct meson_pinctrl *priv = dev_get_priv(dev);
59 if (selector > priv->data->num_pins ||
60 selector > priv->data->funcs[0].num_groups)
61 snprintf(pin_name, PINNAME_SIZE, "Error");
63 snprintf(pin_name, PINNAME_SIZE, "%s",
64 priv->data->funcs[0].groups[selector]);
69 int meson_pinmux_get_functions_count(struct udevice *dev)
71 struct meson_pinctrl *priv = dev_get_priv(dev);
73 return priv->data->num_funcs;
76 const char *meson_pinmux_get_function_name(struct udevice *dev,
77 unsigned int selector)
79 struct meson_pinctrl *priv = dev_get_priv(dev);
81 return priv->data->funcs[selector].name;
84 static int meson_gpio_calc_reg_and_bit(struct udevice *dev, unsigned int offset,
85 enum meson_reg_type reg_type,
86 unsigned int *reg, unsigned int *bit)
88 struct meson_pinctrl *priv = dev_get_priv(dev);
89 struct meson_bank *bank = NULL;
90 struct meson_reg_desc *desc;
94 pin = priv->data->pin_base + offset;
96 for (i = 0; i < priv->data->num_banks; i++) {
97 if (pin >= priv->data->banks[i].first &&
98 pin <= priv->data->banks[i].last) {
99 bank = &priv->data->banks[i];
107 desc = &bank->regs[reg_type];
108 *reg = desc->reg * 4;
109 *bit = desc->bit + pin - bank->first;
114 int meson_gpio_get(struct udevice *dev, unsigned int offset)
116 struct meson_pinctrl *priv = dev_get_priv(dev->parent);
117 unsigned int reg, bit;
120 ret = meson_gpio_calc_reg_and_bit(dev->parent, offset, REG_IN, ®,
125 return !!(readl(priv->reg_gpio + reg) & BIT(bit));
128 int meson_gpio_set(struct udevice *dev, unsigned int offset, int value)
130 struct meson_pinctrl *priv = dev_get_priv(dev->parent);
131 unsigned int reg, bit;
134 ret = meson_gpio_calc_reg_and_bit(dev->parent, offset, REG_OUT, ®,
139 clrsetbits_le32(priv->reg_gpio + reg, BIT(bit), value ? BIT(bit) : 0);
144 int meson_gpio_get_direction(struct udevice *dev, unsigned int offset)
146 struct meson_pinctrl *priv = dev_get_priv(dev->parent);
147 unsigned int reg, bit, val;
150 ret = meson_gpio_calc_reg_and_bit(dev->parent, offset, REG_DIR, ®,
155 val = readl(priv->reg_gpio + reg);
157 return (val & BIT(bit)) ? GPIOF_INPUT : GPIOF_OUTPUT;
160 int meson_gpio_direction_input(struct udevice *dev, unsigned int offset)
162 struct meson_pinctrl *priv = dev_get_priv(dev->parent);
163 unsigned int reg, bit;
166 ret = meson_gpio_calc_reg_and_bit(dev->parent, offset, REG_DIR, ®,
171 setbits_le32(priv->reg_gpio + reg, BIT(bit));
176 int meson_gpio_direction_output(struct udevice *dev,
177 unsigned int offset, int value)
179 struct meson_pinctrl *priv = dev_get_priv(dev->parent);
180 unsigned int reg, bit;
183 ret = meson_gpio_calc_reg_and_bit(dev->parent, offset, REG_DIR, ®,
188 clrbits_le32(priv->reg_gpio + reg, BIT(bit));
190 ret = meson_gpio_calc_reg_and_bit(dev->parent, offset, REG_OUT, ®,
195 clrsetbits_le32(priv->reg_gpio + reg, BIT(bit), value ? BIT(bit) : 0);
200 static int meson_pinconf_bias_set(struct udevice *dev, unsigned int pin,
203 struct meson_pinctrl *priv = dev_get_priv(dev);
204 unsigned int offset = pin - priv->data->pin_base;
205 unsigned int reg, bit;
208 ret = meson_gpio_calc_reg_and_bit(dev, offset, REG_PULLEN, ®, &bit);
212 if (param == PIN_CONFIG_BIAS_DISABLE) {
213 clrsetbits_le32(priv->reg_pullen + reg, BIT(bit), 0);
217 /* othewise, enable the bias and select level */
218 clrsetbits_le32(priv->reg_pullen + reg, BIT(bit), 1);
219 ret = meson_gpio_calc_reg_and_bit(dev, offset, REG_PULL, ®, &bit);
223 clrsetbits_le32(priv->reg_pull + reg, BIT(bit),
224 param == PIN_CONFIG_BIAS_PULL_UP);
229 static int meson_pinconf_drive_strength_set(struct udevice *dev,
231 unsigned int drive_strength_ua)
233 struct meson_pinctrl *priv = dev_get_priv(dev);
234 unsigned int offset = pin - priv->data->pin_base;
235 unsigned int reg, bit;
240 dev_err(dev, "drive-strength-microamp not supported\n");
244 ret = meson_gpio_calc_reg_and_bit(dev, offset, REG_DS, ®, &bit);
250 if (drive_strength_ua <= 500) {
251 ds_val = MESON_PINCONF_DRV_500UA;
252 } else if (drive_strength_ua <= 2500) {
253 ds_val = MESON_PINCONF_DRV_2500UA;
254 } else if (drive_strength_ua <= 3000) {
255 ds_val = MESON_PINCONF_DRV_3000UA;
256 } else if (drive_strength_ua <= 4000) {
257 ds_val = MESON_PINCONF_DRV_4000UA;
260 "pin %u: invalid drive-strength-microamp : %d , default to 4mA\n",
261 pin, drive_strength_ua);
262 ds_val = MESON_PINCONF_DRV_4000UA;
265 clrsetbits_le32(priv->reg_ds + reg, 0x3 << bit, ds_val << bit);
270 int meson_pinconf_set(struct udevice *dev, unsigned int pin,
271 unsigned int param, unsigned int arg)
276 case PIN_CONFIG_BIAS_DISABLE:
277 case PIN_CONFIG_BIAS_PULL_UP:
278 case PIN_CONFIG_BIAS_PULL_DOWN:
279 ret = meson_pinconf_bias_set(dev, pin, param);
281 case PIN_CONFIG_DRIVE_STRENGTH_UA:
282 ret = meson_pinconf_drive_strength_set(dev, pin, arg);
285 dev_err(dev, "unsupported configuration parameter %u\n", param);
292 int meson_pinconf_group_set(struct udevice *dev,
293 unsigned int group_selector,
294 unsigned int param, unsigned int arg)
296 struct meson_pinctrl *priv = dev_get_priv(dev);
297 struct meson_pmx_group *grp = &priv->data->groups[group_selector];
300 for (i = 0; i < grp->num_pins; i++) {
301 ret = meson_pinconf_set(dev, grp->pins[i], param, arg);
309 int meson_gpio_probe(struct udevice *dev)
311 struct meson_pinctrl *priv = dev_get_priv(dev->parent);
312 struct gpio_dev_priv *uc_priv;
314 uc_priv = dev_get_uclass_priv(dev);
315 uc_priv->bank_name = priv->data->name;
316 uc_priv->gpio_count = priv->data->num_pins;
321 static fdt_addr_t parse_address(int offset, const char *name, int na, int ns)
326 index = fdt_stringlist_search(gd->fdt_blob, offset, "reg-names", name);
328 return FDT_ADDR_T_NONE;
330 reg = fdt_getprop(gd->fdt_blob, offset, "reg", &len);
331 if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns))))
332 return FDT_ADDR_T_NONE;
334 reg += index * (na + ns);
336 return fdt_translate_address((void *)gd->fdt_blob, offset, reg);
339 int meson_pinctrl_probe(struct udevice *dev)
341 struct meson_pinctrl *priv = dev_get_priv(dev);
342 struct uclass_driver *drv;
343 struct udevice *gpio_dev;
345 int node, gpio = -1, len;
349 na = fdt_address_cells(gd->fdt_blob, dev_of_offset(dev->parent));
351 debug("bad #address-cells\n");
355 ns = fdt_size_cells(gd->fdt_blob, dev_of_offset(dev->parent));
357 debug("bad #size-cells\n");
361 fdt_for_each_subnode(node, gd->fdt_blob, dev_of_offset(dev)) {
362 if (fdt_getprop(gd->fdt_blob, node, "gpio-controller", &len)) {
369 debug("gpio node not found\n");
373 addr = parse_address(gpio, "mux", na, ns);
374 if (addr == FDT_ADDR_T_NONE) {
375 debug("mux address not found\n");
378 priv->reg_mux = (void __iomem *)addr;
380 addr = parse_address(gpio, "gpio", na, ns);
381 if (addr == FDT_ADDR_T_NONE) {
382 debug("gpio address not found\n");
385 priv->reg_gpio = (void __iomem *)addr;
387 addr = parse_address(gpio, "pull", na, ns);
388 /* Use gpio region if pull one is not present */
389 if (addr == FDT_ADDR_T_NONE)
390 priv->reg_pull = priv->reg_gpio;
392 priv->reg_pull = (void __iomem *)addr;
394 addr = parse_address(gpio, "pull-enable", na, ns);
395 /* Use pull region if pull-enable one is not present */
396 if (addr == FDT_ADDR_T_NONE)
397 priv->reg_pullen = priv->reg_pull;
399 priv->reg_pullen = (void __iomem *)addr;
401 addr = parse_address(gpio, "ds", na, ns);
402 /* Drive strength region is optional */
403 if (addr == FDT_ADDR_T_NONE)
406 priv->reg_ds = (void __iomem *)addr;
408 priv->data = (struct meson_pinctrl_data *)dev_get_driver_data(dev);
410 /* Lookup GPIO driver */
411 drv = lists_uclass_lookup(UCLASS_GPIO);
413 puts("Cannot find GPIO driver\n");
417 name = calloc(1, 32);
418 sprintf(name, "meson-gpio");
420 /* Create child device UCLASS_GPIO and bind it */
421 device_bind(dev, priv->data->gpio_driver, name, NULL, gpio, &gpio_dev);
422 dev_set_of_offset(gpio_dev, gpio);