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>
16 #include <dt-bindings/gpio/gpio.h>
18 DECLARE_GLOBAL_DATA_PTR;
20 #define S5P_GPIO_GET_PIN(x) (x % GPIO_PER_BANK)
22 #define CON_MASK(val) (0xf << ((val) << 2))
23 #define CON_SFR(gpio, cfg) ((cfg) << ((gpio) << 2))
24 #define CON_SFR_UNSHIFT(val, gpio) ((val) >> ((gpio) << 2))
26 #define DAT_MASK(gpio) (0x1 << (gpio))
27 #define DAT_SET(gpio) (0x1 << (gpio))
29 #define PULL_MASK(gpio) (0x3 << ((gpio) << 1))
30 #define PULL_MODE(gpio, pull) ((pull) << ((gpio) << 1))
32 #define DRV_MASK(gpio) (0x3 << ((gpio) << 1))
33 #define DRV_SET(gpio, mode) ((mode) << ((gpio) << 1))
34 #define RATE_MASK(gpio) (0x1 << (gpio + 16))
35 #define RATE_SET(gpio) (0x1 << (gpio + 16))
37 /* Platform data for each bank */
38 struct exynos_gpio_platdata {
39 struct s5p_gpio_bank *bank;
40 const char *bank_name; /* Name of port, e.g. 'gpa0" */
43 /* Information about each bank at run-time */
44 struct exynos_bank_info {
45 struct s5p_gpio_bank *bank;
48 static struct s5p_gpio_bank *s5p_gpio_get_bank(unsigned int gpio)
50 const struct gpio_info *data;
54 data = get_gpio_data();
55 count = get_bank_num();
58 for (i = 0; i < count; i++) {
59 debug("i=%d, upto=%d\n", i, upto);
60 if (gpio < data->max_gpio) {
61 struct s5p_gpio_bank *bank;
62 bank = (struct s5p_gpio_bank *)data->reg_addr;
63 bank += (gpio - upto) / GPIO_PER_BANK;
64 debug("gpio=%d, bank=%p\n", gpio, bank);
68 upto = data->max_gpio;
75 static void s5p_gpio_cfg_pin(struct s5p_gpio_bank *bank, int gpio, int cfg)
79 value = readl(&bank->con);
80 value &= ~CON_MASK(gpio);
81 value |= CON_SFR(gpio, cfg);
82 writel(value, &bank->con);
85 static void s5p_gpio_set_value(struct s5p_gpio_bank *bank, int gpio, int en)
89 value = readl(&bank->dat);
90 value &= ~DAT_MASK(gpio);
92 value |= DAT_SET(gpio);
93 writel(value, &bank->dat);
96 #ifdef CONFIG_SPL_BUILD
97 /* Common GPIO API - SPL does not support driver model yet */
98 int gpio_set_value(unsigned gpio, int value)
100 s5p_gpio_set_value(s5p_gpio_get_bank(gpio),
101 s5p_gpio_get_pin(gpio), value);
106 static int s5p_gpio_get_cfg_pin(struct s5p_gpio_bank *bank, int gpio)
110 value = readl(&bank->con);
111 value &= CON_MASK(gpio);
112 return CON_SFR_UNSHIFT(value, gpio);
115 static unsigned int s5p_gpio_get_value(struct s5p_gpio_bank *bank, int gpio)
119 value = readl(&bank->dat);
120 return !!(value & DAT_MASK(gpio));
122 #endif /* CONFIG_SPL_BUILD */
124 static void s5p_gpio_set_pull(struct s5p_gpio_bank *bank, int gpio, int mode)
128 value = readl(&bank->pull);
129 value &= ~PULL_MASK(gpio);
132 case S5P_GPIO_PULL_DOWN:
133 case S5P_GPIO_PULL_UP:
134 value |= PULL_MODE(gpio, mode);
140 writel(value, &bank->pull);
143 static void s5p_gpio_set_drv(struct s5p_gpio_bank *bank, int gpio, int mode)
147 value = readl(&bank->drv);
148 value &= ~DRV_MASK(gpio);
151 case S5P_GPIO_DRV_1X:
152 case S5P_GPIO_DRV_2X:
153 case S5P_GPIO_DRV_3X:
154 case S5P_GPIO_DRV_4X:
155 value |= DRV_SET(gpio, mode);
161 writel(value, &bank->drv);
164 static void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode)
168 value = readl(&bank->drv);
169 value &= ~RATE_MASK(gpio);
172 case S5P_GPIO_DRV_FAST:
173 case S5P_GPIO_DRV_SLOW:
174 value |= RATE_SET(gpio);
180 writel(value, &bank->drv);
183 int s5p_gpio_get_pin(unsigned gpio)
185 return S5P_GPIO_GET_PIN(gpio);
188 /* Driver model interface */
189 #ifndef CONFIG_SPL_BUILD
190 /* set GPIO pin 'gpio' as an input */
191 static int exynos_gpio_direction_input(struct udevice *dev, unsigned offset)
193 struct exynos_bank_info *state = dev_get_priv(dev);
195 /* Configure GPIO direction as input. */
196 s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_INPUT);
201 /* set GPIO pin 'gpio' as an output, with polarity 'value' */
202 static int exynos_gpio_direction_output(struct udevice *dev, unsigned offset,
205 struct exynos_bank_info *state = dev_get_priv(dev);
207 /* Configure GPIO output value. */
208 s5p_gpio_set_value(state->bank, offset, value);
210 /* Configure GPIO direction as output. */
211 s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_OUTPUT);
216 /* read GPIO IN value of pin 'gpio' */
217 static int exynos_gpio_get_value(struct udevice *dev, unsigned offset)
219 struct exynos_bank_info *state = dev_get_priv(dev);
221 return s5p_gpio_get_value(state->bank, offset);
224 /* write GPIO OUT value to pin 'gpio' */
225 static int exynos_gpio_set_value(struct udevice *dev, unsigned offset,
228 struct exynos_bank_info *state = dev_get_priv(dev);
230 s5p_gpio_set_value(state->bank, offset, value);
234 #endif /* nCONFIG_SPL_BUILD */
237 * There is no common GPIO API for pull, drv, pin, rate (yet). These
238 * functions are kept here to preserve function ordering for review.
240 void gpio_set_pull(int gpio, int mode)
242 s5p_gpio_set_pull(s5p_gpio_get_bank(gpio),
243 s5p_gpio_get_pin(gpio), mode);
246 void gpio_set_drv(int gpio, int mode)
248 s5p_gpio_set_drv(s5p_gpio_get_bank(gpio),
249 s5p_gpio_get_pin(gpio), mode);
252 void gpio_cfg_pin(int gpio, int cfg)
254 s5p_gpio_cfg_pin(s5p_gpio_get_bank(gpio),
255 s5p_gpio_get_pin(gpio), cfg);
258 void gpio_set_rate(int gpio, int mode)
260 s5p_gpio_set_rate(s5p_gpio_get_bank(gpio),
261 s5p_gpio_get_pin(gpio), mode);
264 #ifndef CONFIG_SPL_BUILD
265 static int exynos_gpio_get_function(struct udevice *dev, unsigned offset)
267 struct exynos_bank_info *state = dev_get_priv(dev);
270 cfg = s5p_gpio_get_cfg_pin(state->bank, offset);
271 if (cfg == S5P_GPIO_OUTPUT)
273 else if (cfg == S5P_GPIO_INPUT)
279 static int exynos_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
280 struct fdtdec_phandle_args *args)
282 desc->offset = args->args[0];
283 desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
288 static const struct dm_gpio_ops gpio_exynos_ops = {
289 .direction_input = exynos_gpio_direction_input,
290 .direction_output = exynos_gpio_direction_output,
291 .get_value = exynos_gpio_get_value,
292 .set_value = exynos_gpio_set_value,
293 .get_function = exynos_gpio_get_function,
294 .xlate = exynos_gpio_xlate,
297 static int gpio_exynos_probe(struct udevice *dev)
299 struct gpio_dev_priv *uc_priv = dev->uclass_priv;
300 struct exynos_bank_info *priv = dev->priv;
301 struct exynos_gpio_platdata *plat = dev->platdata;
303 /* Only child devices have ports */
307 priv->bank = plat->bank;
309 uc_priv->gpio_count = GPIO_PER_BANK;
310 uc_priv->bank_name = plat->bank_name;
316 * We have a top-level GPIO device with no actual GPIOs. It has a child
317 * device for each Exynos GPIO bank.
319 static int gpio_exynos_bind(struct udevice *parent)
321 struct exynos_gpio_platdata *plat = parent->platdata;
322 struct s5p_gpio_bank *bank, *base;
323 const void *blob = gd->fdt_blob;
326 /* If this is a child device, there is nothing to do here */
330 base = (struct s5p_gpio_bank *)fdtdec_get_addr(gd->fdt_blob,
331 parent->of_offset, "reg");
332 for (node = fdt_first_subnode(blob, parent->of_offset), bank = base;
334 node = fdt_next_subnode(blob, node), bank++) {
335 struct exynos_gpio_platdata *plat;
340 if (!fdtdec_get_bool(blob, node, "gpio-controller"))
342 plat = calloc(1, sizeof(*plat));
345 reg = fdtdec_get_addr(blob, node, "reg");
346 if (reg != FDT_ADDR_T_NONE)
347 bank = (struct s5p_gpio_bank *)((ulong)base + reg);
349 plat->bank_name = fdt_get_name(blob, node, NULL);
350 debug("dev at %p: %s\n", bank, plat->bank_name);
352 ret = device_bind(parent, parent->driver,
353 plat->bank_name, plat, -1, &dev);
356 dev->of_offset = node;
362 static const struct udevice_id exynos_gpio_ids[] = {
363 { .compatible = "samsung,s5pc100-pinctrl" },
364 { .compatible = "samsung,s5pc110-pinctrl" },
365 { .compatible = "samsung,exynos4210-pinctrl" },
366 { .compatible = "samsung,exynos4x12-pinctrl" },
367 { .compatible = "samsung,exynos5250-pinctrl" },
368 { .compatible = "samsung,exynos5420-pinctrl" },
372 U_BOOT_DRIVER(gpio_exynos) = {
373 .name = "gpio_exynos",
375 .of_match = exynos_gpio_ids,
376 .bind = gpio_exynos_bind,
377 .probe = gpio_exynos_probe,
378 .priv_auto_alloc_size = sizeof(struct exynos_bank_info),
379 .ops = &gpio_exynos_ops,