2 * (C) Copyright 2009 Samsung Electronics
3 * Minkyu Kang <mk7.kang@samsung.com>
5 * SPDX-License-Identifier: GPL-2.0+
15 #include <dm/device-internal.h>
17 DECLARE_GLOBAL_DATA_PTR;
19 #define S5P_GPIO_GET_PIN(x) (x % GPIO_PER_BANK)
21 #define CON_MASK(val) (0xf << ((val) << 2))
22 #define CON_SFR(gpio, cfg) ((cfg) << ((gpio) << 2))
23 #define CON_SFR_UNSHIFT(val, gpio) ((val) >> ((gpio) << 2))
25 #define DAT_MASK(gpio) (0x1 << (gpio))
26 #define DAT_SET(gpio) (0x1 << (gpio))
28 #define PULL_MASK(gpio) (0x3 << ((gpio) << 1))
29 #define PULL_MODE(gpio, pull) ((pull) << ((gpio) << 1))
31 #define DRV_MASK(gpio) (0x3 << ((gpio) << 1))
32 #define DRV_SET(gpio, mode) ((mode) << ((gpio) << 1))
33 #define RATE_MASK(gpio) (0x1 << (gpio + 16))
34 #define RATE_SET(gpio) (0x1 << (gpio + 16))
36 /* Platform data for each bank */
37 struct exynos_gpio_platdata {
38 struct s5p_gpio_bank *bank;
39 const char *bank_name; /* Name of port, e.g. 'gpa0" */
42 /* Information about each bank at run-time */
43 struct exynos_bank_info {
44 struct s5p_gpio_bank *bank;
47 static struct s5p_gpio_bank *s5p_gpio_get_bank(unsigned int gpio)
49 const struct gpio_info *data;
53 data = get_gpio_data();
54 count = get_bank_num();
57 for (i = 0; i < count; i++) {
58 debug("i=%d, upto=%d\n", i, upto);
59 if (gpio < data->max_gpio) {
60 struct s5p_gpio_bank *bank;
61 bank = (struct s5p_gpio_bank *)data->reg_addr;
62 bank += (gpio - upto) / GPIO_PER_BANK;
63 debug("gpio=%d, bank=%p\n", gpio, bank);
67 upto = data->max_gpio;
74 static void s5p_gpio_cfg_pin(struct s5p_gpio_bank *bank, int gpio, int cfg)
78 value = readl(&bank->con);
79 value &= ~CON_MASK(gpio);
80 value |= CON_SFR(gpio, cfg);
81 writel(value, &bank->con);
84 static void s5p_gpio_set_value(struct s5p_gpio_bank *bank, int gpio, int en)
88 value = readl(&bank->dat);
89 value &= ~DAT_MASK(gpio);
91 value |= DAT_SET(gpio);
92 writel(value, &bank->dat);
95 #ifdef CONFIG_SPL_BUILD
96 /* Common GPIO API - SPL does not support driver model yet */
97 int gpio_set_value(unsigned gpio, int value)
99 s5p_gpio_set_value(s5p_gpio_get_bank(gpio),
100 s5p_gpio_get_pin(gpio), value);
105 static int s5p_gpio_get_cfg_pin(struct s5p_gpio_bank *bank, int gpio)
109 value = readl(&bank->con);
110 value &= CON_MASK(gpio);
111 return CON_SFR_UNSHIFT(value, gpio);
114 static unsigned int s5p_gpio_get_value(struct s5p_gpio_bank *bank, int gpio)
118 value = readl(&bank->dat);
119 return !!(value & DAT_MASK(gpio));
121 #endif /* CONFIG_SPL_BUILD */
123 static void s5p_gpio_set_pull(struct s5p_gpio_bank *bank, int gpio, int mode)
127 value = readl(&bank->pull);
128 value &= ~PULL_MASK(gpio);
131 case S5P_GPIO_PULL_DOWN:
132 case S5P_GPIO_PULL_UP:
133 value |= PULL_MODE(gpio, mode);
139 writel(value, &bank->pull);
142 static void s5p_gpio_set_drv(struct s5p_gpio_bank *bank, int gpio, int mode)
146 value = readl(&bank->drv);
147 value &= ~DRV_MASK(gpio);
150 case S5P_GPIO_DRV_1X:
151 case S5P_GPIO_DRV_2X:
152 case S5P_GPIO_DRV_3X:
153 case S5P_GPIO_DRV_4X:
154 value |= DRV_SET(gpio, mode);
160 writel(value, &bank->drv);
163 static void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode)
167 value = readl(&bank->drv);
168 value &= ~RATE_MASK(gpio);
171 case S5P_GPIO_DRV_FAST:
172 case S5P_GPIO_DRV_SLOW:
173 value |= RATE_SET(gpio);
179 writel(value, &bank->drv);
182 int s5p_gpio_get_pin(unsigned gpio)
184 return S5P_GPIO_GET_PIN(gpio);
187 /* Driver model interface */
188 #ifndef CONFIG_SPL_BUILD
189 /* set GPIO pin 'gpio' as an input */
190 static int exynos_gpio_direction_input(struct udevice *dev, unsigned offset)
192 struct exynos_bank_info *state = dev_get_priv(dev);
194 /* Configure GPIO direction as input. */
195 s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_INPUT);
200 /* set GPIO pin 'gpio' as an output, with polarity 'value' */
201 static int exynos_gpio_direction_output(struct udevice *dev, unsigned offset,
204 struct exynos_bank_info *state = dev_get_priv(dev);
206 /* Configure GPIO output value. */
207 s5p_gpio_set_value(state->bank, offset, value);
209 /* Configure GPIO direction as output. */
210 s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_OUTPUT);
215 /* read GPIO IN value of pin 'gpio' */
216 static int exynos_gpio_get_value(struct udevice *dev, unsigned offset)
218 struct exynos_bank_info *state = dev_get_priv(dev);
220 return s5p_gpio_get_value(state->bank, offset);
223 /* write GPIO OUT value to pin 'gpio' */
224 static int exynos_gpio_set_value(struct udevice *dev, unsigned offset,
227 struct exynos_bank_info *state = dev_get_priv(dev);
229 s5p_gpio_set_value(state->bank, offset, value);
233 #endif /* nCONFIG_SPL_BUILD */
236 * There is no common GPIO API for pull, drv, pin, rate (yet). These
237 * functions are kept here to preserve function ordering for review.
239 void gpio_set_pull(int gpio, int mode)
241 s5p_gpio_set_pull(s5p_gpio_get_bank(gpio),
242 s5p_gpio_get_pin(gpio), mode);
245 void gpio_set_drv(int gpio, int mode)
247 s5p_gpio_set_drv(s5p_gpio_get_bank(gpio),
248 s5p_gpio_get_pin(gpio), mode);
251 void gpio_cfg_pin(int gpio, int cfg)
253 s5p_gpio_cfg_pin(s5p_gpio_get_bank(gpio),
254 s5p_gpio_get_pin(gpio), cfg);
257 void gpio_set_rate(int gpio, int mode)
259 s5p_gpio_set_rate(s5p_gpio_get_bank(gpio),
260 s5p_gpio_get_pin(gpio), mode);
263 #ifndef CONFIG_SPL_BUILD
264 static int exynos_gpio_get_function(struct udevice *dev, unsigned offset)
266 struct exynos_bank_info *state = dev_get_priv(dev);
269 cfg = s5p_gpio_get_cfg_pin(state->bank, offset);
270 if (cfg == S5P_GPIO_OUTPUT)
272 else if (cfg == S5P_GPIO_INPUT)
278 static const struct dm_gpio_ops gpio_exynos_ops = {
279 .direction_input = exynos_gpio_direction_input,
280 .direction_output = exynos_gpio_direction_output,
281 .get_value = exynos_gpio_get_value,
282 .set_value = exynos_gpio_set_value,
283 .get_function = exynos_gpio_get_function,
286 static int gpio_exynos_probe(struct udevice *dev)
288 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
289 struct exynos_bank_info *priv = dev->priv;
290 struct exynos_gpio_platdata *plat = dev->platdata;
292 /* Only child devices have ports */
296 priv->bank = plat->bank;
298 uc_priv->gpio_count = GPIO_PER_BANK;
299 uc_priv->bank_name = plat->bank_name;
305 * We have a top-level GPIO device with no actual GPIOs. It has a child
306 * device for each Exynos GPIO bank.
308 static int gpio_exynos_bind(struct udevice *parent)
310 struct exynos_gpio_platdata *plat = parent->platdata;
311 struct s5p_gpio_bank *bank, *base;
312 const void *blob = gd->fdt_blob;
315 /* If this is a child device, there is nothing to do here */
319 base = (struct s5p_gpio_bank *)dev_get_addr(parent);
320 for (node = fdt_first_subnode(blob, parent->of_offset), bank = base;
322 node = fdt_next_subnode(blob, node), bank++) {
323 struct exynos_gpio_platdata *plat;
328 if (!fdtdec_get_bool(blob, node, "gpio-controller"))
330 plat = calloc(1, sizeof(*plat));
334 plat->bank_name = fdt_get_name(blob, node, NULL);
335 ret = device_bind(parent, parent->driver,
336 plat->bank_name, plat, -1, &dev);
340 dev->of_offset = node;
342 reg = dev_get_addr(dev);
343 if (reg != FDT_ADDR_T_NONE)
344 bank = (struct s5p_gpio_bank *)((ulong)base + reg);
348 debug("dev at %p: %s\n", bank, plat->bank_name);
354 static const struct udevice_id exynos_gpio_ids[] = {
355 { .compatible = "samsung,s5pc100-pinctrl" },
356 { .compatible = "samsung,s5pc110-pinctrl" },
357 { .compatible = "samsung,exynos4210-pinctrl" },
358 { .compatible = "samsung,exynos4x12-pinctrl" },
359 { .compatible = "samsung,exynos5250-pinctrl" },
360 { .compatible = "samsung,exynos5420-pinctrl" },
364 U_BOOT_DRIVER(gpio_exynos) = {
365 .name = "gpio_exynos",
367 .of_match = exynos_gpio_ids,
368 .bind = gpio_exynos_bind,
369 .probe = gpio_exynos_probe,
370 .priv_auto_alloc_size = sizeof(struct exynos_bank_info),
371 .ops = &gpio_exynos_ops,