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
11 #include <asm/global_data.h>
12 #include <linux/bitops.h>
13 #include <linux/errno.h>
15 #include <asm/arch/iomux.h>
16 #include <asm/arch/imx-regs.h>
18 #if defined(CONFIG_MX23)
19 #define PINCTRL_BANKS 3
20 #define PINCTRL_DOUT(n) (0x0500 + ((n) * 0x10))
21 #define PINCTRL_DIN(n) (0x0600 + ((n) * 0x10))
22 #define PINCTRL_DOE(n) (0x0700 + ((n) * 0x10))
23 #define PINCTRL_PIN2IRQ(n) (0x0800 + ((n) * 0x10))
24 #define PINCTRL_IRQEN(n) (0x0900 + ((n) * 0x10))
25 #define PINCTRL_IRQSTAT(n) (0x0c00 + ((n) * 0x10))
26 #elif defined(CONFIG_MX28)
27 #define PINCTRL_BANKS 5
28 #define PINCTRL_DOUT(n) (0x0700 + ((n) * 0x10))
29 #define PINCTRL_DIN(n) (0x0900 + ((n) * 0x10))
30 #define PINCTRL_DOE(n) (0x0b00 + ((n) * 0x10))
31 #define PINCTRL_PIN2IRQ(n) (0x1000 + ((n) * 0x10))
32 #define PINCTRL_IRQEN(n) (0x1100 + ((n) * 0x10))
33 #define PINCTRL_IRQSTAT(n) (0x1400 + ((n) * 0x10))
35 #error "Please select CONFIG_MX23 or CONFIG_MX28"
38 #define GPIO_INT_FALL_EDGE 0x0
39 #define GPIO_INT_LOW_LEV 0x1
40 #define GPIO_INT_RISE_EDGE 0x2
41 #define GPIO_INT_HIGH_LEV 0x3
42 #define GPIO_INT_LEV_MASK (1 << 0)
43 #define GPIO_INT_POL_MASK (1 << 1)
45 void mxs_gpio_init(void)
49 for (i = 0; i < PINCTRL_BANKS; i++) {
50 writel(0, MXS_PINCTRL_BASE + PINCTRL_PIN2IRQ(i));
51 writel(0, MXS_PINCTRL_BASE + PINCTRL_IRQEN(i));
52 /* Use SCT address here to clear the IRQSTAT bits */
53 writel(0xffffffff, MXS_PINCTRL_BASE + PINCTRL_IRQSTAT(i) + 8);
57 #if !CONFIG_IS_ENABLED(DM_GPIO)
58 int gpio_get_value(unsigned gpio)
60 uint32_t bank = PAD_BANK(gpio);
61 uint32_t offset = PINCTRL_DIN(bank);
62 struct mxs_register_32 *reg =
63 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
65 return (readl(®->reg) >> PAD_PIN(gpio)) & 1;
68 void gpio_set_value(unsigned gpio, int value)
70 uint32_t bank = PAD_BANK(gpio);
71 uint32_t offset = PINCTRL_DOUT(bank);
72 struct mxs_register_32 *reg =
73 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
76 writel(1 << PAD_PIN(gpio), ®->reg_set);
78 writel(1 << PAD_PIN(gpio), ®->reg_clr);
81 int gpio_direction_input(unsigned gpio)
83 uint32_t bank = PAD_BANK(gpio);
84 uint32_t offset = PINCTRL_DOE(bank);
85 struct mxs_register_32 *reg =
86 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
88 writel(1 << PAD_PIN(gpio), ®->reg_clr);
93 int gpio_direction_output(unsigned gpio, int value)
95 uint32_t bank = PAD_BANK(gpio);
96 uint32_t offset = PINCTRL_DOE(bank);
97 struct mxs_register_32 *reg =
98 (struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);
100 gpio_set_value(gpio, value);
102 writel(1 << PAD_PIN(gpio), ®->reg_set);
107 int gpio_request(unsigned gpio, const char *label)
109 if (PAD_BANK(gpio) >= PINCTRL_BANKS)
115 int gpio_free(unsigned gpio)
120 int name_to_gpio(const char *name)
125 bank = dectoul(name, &end);
127 if (!*end || *end != ':')
130 pin = dectoul(end + 1, NULL);
132 return (bank << MXS_PAD_BANK_SHIFT) | (pin << MXS_PAD_PIN_SHIFT);
136 #include <asm/gpio.h>
137 #include <dt-structs.h>
138 #include <asm/arch/gpio.h>
139 #define MXS_MAX_GPIO_PER_BANK 32
141 DECLARE_GLOBAL_DATA_PTR;
143 * According to i.MX28 Reference Manual:
144 * 'i.MX28 Applications Processor Reference Manual, Rev. 1, 2010'
145 * The i.MX28 has following number of GPIOs available:
146 * Bank 0: 0-28 -> 29 PINS
147 * Bank 1: 0-31 -> 32 PINS
148 * Bank 2: 0-27 -> 28 PINS
149 * Bank 3: 0-30 -> 31 PINS
150 * Bank 4: 0-20 -> 21 PINS
153 struct mxs_gpio_plat {
154 #if CONFIG_IS_ENABLED(OF_PLATDATA)
155 struct dtd_fsl_imx23_gpio dtplat;
161 struct mxs_gpio_priv {
165 static int mxs_gpio_get_value(struct udevice *dev, unsigned offset)
167 struct mxs_gpio_priv *priv = dev_get_priv(dev);
168 struct mxs_register_32 *reg =
169 (struct mxs_register_32 *)(MXS_PINCTRL_BASE +
170 PINCTRL_DIN(priv->bank));
172 return (readl(®->reg) >> offset) & 1;
175 static int mxs_gpio_set_value(struct udevice *dev, unsigned offset,
178 struct mxs_gpio_priv *priv = dev_get_priv(dev);
179 struct mxs_register_32 *reg =
180 (struct mxs_register_32 *)(MXS_PINCTRL_BASE +
181 PINCTRL_DOUT(priv->bank));
183 writel(BIT(offset), ®->reg_set);
185 writel(BIT(offset), ®->reg_clr);
190 static int mxs_gpio_direction_input(struct udevice *dev, unsigned offset)
192 struct mxs_gpio_priv *priv = dev_get_priv(dev);
193 struct mxs_register_32 *reg =
194 (struct mxs_register_32 *)(MXS_PINCTRL_BASE +
195 PINCTRL_DOE(priv->bank));
197 writel(BIT(offset), ®->reg_clr);
202 static int mxs_gpio_direction_output(struct udevice *dev, unsigned offset,
205 struct mxs_gpio_priv *priv = dev_get_priv(dev);
206 struct mxs_register_32 *reg =
207 (struct mxs_register_32 *)(MXS_PINCTRL_BASE +
208 PINCTRL_DOE(priv->bank));
210 mxs_gpio_set_value(dev, offset, value);
212 writel(BIT(offset), ®->reg_set);
217 static int mxs_gpio_get_function(struct udevice *dev, unsigned offset)
219 struct mxs_gpio_priv *priv = dev_get_priv(dev);
220 struct mxs_register_32 *reg =
221 (struct mxs_register_32 *)(MXS_PINCTRL_BASE +
222 PINCTRL_DOE(priv->bank));
223 bool is_output = !!(readl(®->reg) >> offset);
225 return is_output ? GPIOF_OUTPUT : GPIOF_INPUT;
228 static const struct dm_gpio_ops gpio_mxs_ops = {
229 .direction_input = mxs_gpio_direction_input,
230 .direction_output = mxs_gpio_direction_output,
231 .get_value = mxs_gpio_get_value,
232 .set_value = mxs_gpio_set_value,
233 .get_function = mxs_gpio_get_function,
236 static int mxs_gpio_probe(struct udevice *dev)
238 struct mxs_gpio_plat *plat = dev_get_plat(dev);
239 struct mxs_gpio_priv *priv = dev_get_priv(dev);
240 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
243 #if CONFIG_IS_ENABLED(OF_PLATDATA)
244 struct dtd_fsl_imx23_gpio *dtplat = &plat->dtplat;
245 priv->bank = (unsigned int)dtplat->reg[0];
246 uc_priv->gpio_count = dtplat->gpio_ranges[3];
248 priv->bank = (unsigned int)plat->bank;
249 uc_priv->gpio_count = plat->gpio_ranges;
251 snprintf(name, sizeof(name), "GPIO%d_", priv->bank);
256 uc_priv->bank_name = str;
258 debug("%s: %s: %d pins base: 0x%x\n", __func__, uc_priv->bank_name,
259 uc_priv->gpio_count, priv->bank);
264 #if CONFIG_IS_ENABLED(OF_REAL)
265 static int mxs_of_to_plat(struct udevice *dev)
267 struct mxs_gpio_plat *plat = dev_get_plat(dev);
268 struct fdtdec_phandle_args args;
269 int node = dev_of_offset(dev);
272 plat->bank = dev_read_addr(dev);
273 if (plat->bank == FDT_ADDR_T_NONE) {
274 printf("%s: No 'reg' property defined!\n", __func__);
278 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges",
281 printf("%s: 'gpio-ranges' not defined - using default!\n",
284 plat->gpio_ranges = ret == 0 ? args.args[2] : MXS_MAX_GPIO_PER_BANK;
289 static const struct udevice_id mxs_gpio_ids[] = {
290 { .compatible = "fsl,imx23-gpio" },
291 { .compatible = "fsl,imx28-gpio" },
296 U_BOOT_DRIVER(fsl_imx23_gpio) = {
297 .name = "fsl_imx23_gpio",
299 .ops = &gpio_mxs_ops,
300 .probe = mxs_gpio_probe,
301 .priv_auto = sizeof(struct mxs_gpio_priv),
302 .plat_auto = sizeof(struct mxs_gpio_plat),
303 #if CONFIG_IS_ENABLED(OF_REAL)
304 .of_match = mxs_gpio_ids,
305 .of_to_plat = mxs_of_to_plat,
309 DM_DRIVER_ALIAS(fsl_imx23_gpio, fsl_imx28_gpio)