1 // SPDX-License-Identifier: GPL-2.0+
3 * Freescale i.MX28 GPIO control code
5 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
6 * on behalf of DENX Software Engineering GmbH
12 #include <asm/global_data.h>
13 #include <linux/bitops.h>
14 #include <linux/errno.h>
16 #include <asm/arch/iomux.h>
17 #include <asm/arch/imx-regs.h>
19 #if defined(CONFIG_MX23)
20 #define PINCTRL_BANKS 3
21 #define PINCTRL_DOUT(n) (0x0500 + ((n) * 0x10))
22 #define PINCTRL_DIN(n) (0x0600 + ((n) * 0x10))
23 #define PINCTRL_DOE(n) (0x0700 + ((n) * 0x10))
24 #define PINCTRL_PIN2IRQ(n) (0x0800 + ((n) * 0x10))
25 #define PINCTRL_IRQEN(n) (0x0900 + ((n) * 0x10))
26 #define PINCTRL_IRQSTAT(n) (0x0c00 + ((n) * 0x10))
27 #elif defined(CONFIG_MX28)
28 #define PINCTRL_BANKS 5
29 #define PINCTRL_DOUT(n) (0x0700 + ((n) * 0x10))
30 #define PINCTRL_DIN(n) (0x0900 + ((n) * 0x10))
31 #define PINCTRL_DOE(n) (0x0b00 + ((n) * 0x10))
32 #define PINCTRL_PIN2IRQ(n) (0x1000 + ((n) * 0x10))
33 #define PINCTRL_IRQEN(n) (0x1100 + ((n) * 0x10))
34 #define PINCTRL_IRQSTAT(n) (0x1400 + ((n) * 0x10))
36 #error "Please select CONFIG_MX23 or CONFIG_MX28"
39 #define GPIO_INT_FALL_EDGE 0x0
40 #define GPIO_INT_LOW_LEV 0x1
41 #define GPIO_INT_RISE_EDGE 0x2
42 #define GPIO_INT_HIGH_LEV 0x3
43 #define GPIO_INT_LEV_MASK (1 << 0)
44 #define GPIO_INT_POL_MASK (1 << 1)
46 void mxs_gpio_init(void)
50 for (i = 0; i < PINCTRL_BANKS; i++) {
51 writel(0, MXS_PINCTRL_BASE + PINCTRL_PIN2IRQ(i));
52 writel(0, MXS_PINCTRL_BASE + PINCTRL_IRQEN(i));
53 /* Use SCT address here to clear the IRQSTAT bits */
54 writel(0xffffffff, MXS_PINCTRL_BASE + PINCTRL_IRQSTAT(i) + 8);
58 #if !CONFIG_IS_ENABLED(DM_GPIO)
59 int gpio_get_value(unsigned gpio)
61 uint32_t bank = PAD_BANK(gpio);
62 uint32_t offset = PINCTRL_DIN(bank);
63 struct mxs_register_32 *reg =
64 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
66 return (readl(®->reg) >> PAD_PIN(gpio)) & 1;
69 void gpio_set_value(unsigned gpio, int value)
71 uint32_t bank = PAD_BANK(gpio);
72 uint32_t offset = PINCTRL_DOUT(bank);
73 struct mxs_register_32 *reg =
74 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
77 writel(1 << PAD_PIN(gpio), ®->reg_set);
79 writel(1 << PAD_PIN(gpio), ®->reg_clr);
82 int gpio_direction_input(unsigned gpio)
84 uint32_t bank = PAD_BANK(gpio);
85 uint32_t offset = PINCTRL_DOE(bank);
86 struct mxs_register_32 *reg =
87 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
89 writel(1 << PAD_PIN(gpio), ®->reg_clr);
94 int gpio_direction_output(unsigned gpio, int value)
96 uint32_t bank = PAD_BANK(gpio);
97 uint32_t offset = PINCTRL_DOE(bank);
98 struct mxs_register_32 *reg =
99 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
101 gpio_set_value(gpio, value);
103 writel(1 << PAD_PIN(gpio), ®->reg_set);
108 int gpio_request(unsigned gpio, const char *label)
110 if (PAD_BANK(gpio) >= PINCTRL_BANKS)
116 int gpio_free(unsigned gpio)
121 int name_to_gpio(const char *name)
126 bank = dectoul(name, &end);
128 if (!*end || *end != ':')
131 pin = dectoul(end + 1, NULL);
133 return (bank << MXS_PAD_BANK_SHIFT) | (pin << MXS_PAD_PIN_SHIFT);
137 #include <asm/gpio.h>
138 #include <dt-structs.h>
139 #include <asm/arch/gpio.h>
140 #define MXS_MAX_GPIO_PER_BANK 32
142 DECLARE_GLOBAL_DATA_PTR;
144 * According to i.MX28 Reference Manual:
145 * 'i.MX28 Applications Processor Reference Manual, Rev. 1, 2010'
146 * The i.MX28 has following number of GPIOs available:
147 * Bank 0: 0-28 -> 29 PINS
148 * Bank 1: 0-31 -> 32 PINS
149 * Bank 2: 0-27 -> 28 PINS
150 * Bank 3: 0-30 -> 31 PINS
151 * Bank 4: 0-20 -> 21 PINS
154 struct mxs_gpio_plat {
155 #if CONFIG_IS_ENABLED(OF_PLATDATA)
156 struct dtd_fsl_imx23_gpio dtplat;
162 struct mxs_gpio_priv {
166 static int mxs_gpio_get_value(struct udevice *dev, unsigned offset)
168 struct mxs_gpio_priv *priv = dev_get_priv(dev);
169 struct mxs_register_32 *reg =
170 (struct mxs_register_32 *)(MXS_PINCTRL_BASE +
171 PINCTRL_DIN(priv->bank));
173 return (readl(®->reg) >> offset) & 1;
176 static int mxs_gpio_set_value(struct udevice *dev, unsigned offset,
179 struct mxs_gpio_priv *priv = dev_get_priv(dev);
180 struct mxs_register_32 *reg =
181 (struct mxs_register_32 *)(MXS_PINCTRL_BASE +
182 PINCTRL_DOUT(priv->bank));
184 writel(BIT(offset), ®->reg_set);
186 writel(BIT(offset), ®->reg_clr);
191 static int mxs_gpio_direction_input(struct udevice *dev, unsigned offset)
193 struct mxs_gpio_priv *priv = dev_get_priv(dev);
194 struct mxs_register_32 *reg =
195 (struct mxs_register_32 *)(MXS_PINCTRL_BASE +
196 PINCTRL_DOE(priv->bank));
198 writel(BIT(offset), ®->reg_clr);
203 static int mxs_gpio_direction_output(struct udevice *dev, unsigned offset,
206 struct mxs_gpio_priv *priv = dev_get_priv(dev);
207 struct mxs_register_32 *reg =
208 (struct mxs_register_32 *)(MXS_PINCTRL_BASE +
209 PINCTRL_DOE(priv->bank));
211 mxs_gpio_set_value(dev, offset, value);
213 writel(BIT(offset), ®->reg_set);
218 static int mxs_gpio_get_function(struct udevice *dev, unsigned offset)
220 struct mxs_gpio_priv *priv = dev_get_priv(dev);
221 struct mxs_register_32 *reg =
222 (struct mxs_register_32 *)(MXS_PINCTRL_BASE +
223 PINCTRL_DOE(priv->bank));
224 bool is_output = !!(readl(®->reg) >> offset);
226 return is_output ? GPIOF_OUTPUT : GPIOF_INPUT;
229 static const struct dm_gpio_ops gpio_mxs_ops = {
230 .direction_input = mxs_gpio_direction_input,
231 .direction_output = mxs_gpio_direction_output,
232 .get_value = mxs_gpio_get_value,
233 .set_value = mxs_gpio_set_value,
234 .get_function = mxs_gpio_get_function,
237 static int mxs_gpio_probe(struct udevice *dev)
239 struct mxs_gpio_plat *plat = dev_get_plat(dev);
240 struct mxs_gpio_priv *priv = dev_get_priv(dev);
241 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
244 #if CONFIG_IS_ENABLED(OF_PLATDATA)
245 struct dtd_fsl_imx23_gpio *dtplat = &plat->dtplat;
246 priv->bank = (unsigned int)dtplat->reg[0];
247 uc_priv->gpio_count = dtplat->gpio_ranges[3];
249 priv->bank = (unsigned int)plat->bank;
250 uc_priv->gpio_count = plat->gpio_ranges;
252 snprintf(name, sizeof(name), "GPIO%d_", priv->bank);
257 uc_priv->bank_name = str;
259 debug("%s: %s: %d pins base: 0x%x\n", __func__, uc_priv->bank_name,
260 uc_priv->gpio_count, priv->bank);
265 #if CONFIG_IS_ENABLED(OF_REAL)
266 static int mxs_of_to_plat(struct udevice *dev)
268 struct mxs_gpio_plat *plat = dev_get_plat(dev);
269 struct fdtdec_phandle_args args;
270 int node = dev_of_offset(dev);
273 plat->bank = dev_read_addr(dev);
274 if (plat->bank == FDT_ADDR_T_NONE) {
275 printf("%s: No 'reg' property defined!\n", __func__);
279 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges",
282 printf("%s: 'gpio-ranges' not defined - using default!\n",
285 plat->gpio_ranges = ret == 0 ? args.args[2] : MXS_MAX_GPIO_PER_BANK;
290 static const struct udevice_id mxs_gpio_ids[] = {
291 { .compatible = "fsl,imx23-gpio" },
292 { .compatible = "fsl,imx28-gpio" },
297 U_BOOT_DRIVER(fsl_imx23_gpio) = {
298 .name = "fsl_imx23_gpio",
300 .ops = &gpio_mxs_ops,
301 .probe = mxs_gpio_probe,
302 .priv_auto = sizeof(struct mxs_gpio_priv),
303 .plat_auto = sizeof(struct mxs_gpio_plat),
304 #if CONFIG_IS_ENABLED(OF_REAL)
305 .of_match = mxs_gpio_ids,
306 .of_to_plat = mxs_of_to_plat,
310 DM_DRIVER_ALIAS(fsl_imx23_gpio, fsl_imx28_gpio)