1 // SPDX-License-Identifier: GPL-2.0+
3 * Xilinx Zynq GPIO device driver
5 * Copyright (C) 2015 DAVE Embedded Systems <devel@dave.eu>
7 * Most of code taken from linux kernel driver (linux/drivers/gpio/gpio-zynq.c)
8 * Copyright (C) 2009 - 2014 Xilinx, Inc.
14 #include <linux/errno.h>
18 DECLARE_GLOBAL_DATA_PTR;
21 #define ZYNQ_GPIO_MAX_BANK 4
23 #define ZYNQ_GPIO_BANK0_NGPIO 32
24 #define ZYNQ_GPIO_BANK1_NGPIO 22
25 #define ZYNQ_GPIO_BANK2_NGPIO 32
26 #define ZYNQ_GPIO_BANK3_NGPIO 32
28 #define ZYNQ_GPIO_NR_GPIOS (ZYNQ_GPIO_BANK0_NGPIO + \
29 ZYNQ_GPIO_BANK1_NGPIO + \
30 ZYNQ_GPIO_BANK2_NGPIO + \
31 ZYNQ_GPIO_BANK3_NGPIO)
33 #define ZYNQMP_GPIO_MAX_BANK 6
35 #define ZYNQMP_GPIO_BANK0_NGPIO 26
36 #define ZYNQMP_GPIO_BANK1_NGPIO 26
37 #define ZYNQMP_GPIO_BANK2_NGPIO 26
38 #define ZYNQMP_GPIO_BANK3_NGPIO 32
39 #define ZYNQMP_GPIO_BANK4_NGPIO 32
40 #define ZYNQMP_GPIO_BANK5_NGPIO 32
42 #define ZYNQMP_GPIO_NR_GPIOS 174
44 #define ZYNQ_GPIO_BANK0_PIN_MIN(str) 0
45 #define ZYNQ_GPIO_BANK0_PIN_MAX(str) (ZYNQ_GPIO_BANK0_PIN_MIN(str) + \
46 ZYNQ##str##_GPIO_BANK0_NGPIO - 1)
47 #define ZYNQ_GPIO_BANK1_PIN_MIN(str) (ZYNQ_GPIO_BANK0_PIN_MAX(str) + 1)
48 #define ZYNQ_GPIO_BANK1_PIN_MAX(str) (ZYNQ_GPIO_BANK1_PIN_MIN(str) + \
49 ZYNQ##str##_GPIO_BANK1_NGPIO - 1)
50 #define ZYNQ_GPIO_BANK2_PIN_MIN(str) (ZYNQ_GPIO_BANK1_PIN_MAX(str) + 1)
51 #define ZYNQ_GPIO_BANK2_PIN_MAX(str) (ZYNQ_GPIO_BANK2_PIN_MIN(str) + \
52 ZYNQ##str##_GPIO_BANK2_NGPIO - 1)
53 #define ZYNQ_GPIO_BANK3_PIN_MIN(str) (ZYNQ_GPIO_BANK2_PIN_MAX(str) + 1)
54 #define ZYNQ_GPIO_BANK3_PIN_MAX(str) (ZYNQ_GPIO_BANK3_PIN_MIN(str) + \
55 ZYNQ##str##_GPIO_BANK3_NGPIO - 1)
56 #define ZYNQ_GPIO_BANK4_PIN_MIN(str) (ZYNQ_GPIO_BANK3_PIN_MAX(str) + 1)
57 #define ZYNQ_GPIO_BANK4_PIN_MAX(str) (ZYNQ_GPIO_BANK4_PIN_MIN(str) + \
58 ZYNQ##str##_GPIO_BANK4_NGPIO - 1)
59 #define ZYNQ_GPIO_BANK5_PIN_MIN(str) (ZYNQ_GPIO_BANK4_PIN_MAX(str) + 1)
60 #define ZYNQ_GPIO_BANK5_PIN_MAX(str) (ZYNQ_GPIO_BANK5_PIN_MIN(str) + \
61 ZYNQ##str##_GPIO_BANK5_NGPIO - 1)
63 /* Register offsets for the GPIO device */
64 /* LSW Mask & Data -WO */
65 #define ZYNQ_GPIO_DATA_LSW_OFFSET(BANK) (0x000 + (8 * BANK))
66 /* MSW Mask & Data -WO */
67 #define ZYNQ_GPIO_DATA_MSW_OFFSET(BANK) (0x004 + (8 * BANK))
68 /* Data Register-RW */
69 #define ZYNQ_GPIO_DATA_RO_OFFSET(BANK) (0x060 + (4 * BANK))
70 /* Direction mode reg-RW */
71 #define ZYNQ_GPIO_DIRM_OFFSET(BANK) (0x204 + (0x40 * BANK))
72 /* Output enable reg-RW */
73 #define ZYNQ_GPIO_OUTEN_OFFSET(BANK) (0x208 + (0x40 * BANK))
74 /* Interrupt mask reg-RO */
75 #define ZYNQ_GPIO_INTMASK_OFFSET(BANK) (0x20C + (0x40 * BANK))
76 /* Interrupt enable reg-WO */
77 #define ZYNQ_GPIO_INTEN_OFFSET(BANK) (0x210 + (0x40 * BANK))
78 /* Interrupt disable reg-WO */
79 #define ZYNQ_GPIO_INTDIS_OFFSET(BANK) (0x214 + (0x40 * BANK))
80 /* Interrupt status reg-RO */
81 #define ZYNQ_GPIO_INTSTS_OFFSET(BANK) (0x218 + (0x40 * BANK))
82 /* Interrupt type reg-RW */
83 #define ZYNQ_GPIO_INTTYPE_OFFSET(BANK) (0x21C + (0x40 * BANK))
84 /* Interrupt polarity reg-RW */
85 #define ZYNQ_GPIO_INTPOL_OFFSET(BANK) (0x220 + (0x40 * BANK))
86 /* Interrupt on any, reg-RW */
87 #define ZYNQ_GPIO_INTANY_OFFSET(BANK) (0x224 + (0x40 * BANK))
89 /* Disable all interrupts mask */
90 #define ZYNQ_GPIO_IXR_DISABLE_ALL 0xFFFFFFFF
92 /* Mid pin number of a bank */
93 #define ZYNQ_GPIO_MID_PIN_NUM 16
95 /* GPIO upper 16 bit mask */
96 #define ZYNQ_GPIO_UPPER_MASK 0xFFFF0000
98 struct zynq_gpio_privdata {
100 const struct zynq_platform_data *p_data;
104 * struct zynq_platform_data - zynq gpio platform data structure
105 * @label: string to store in gpio->label
106 * @ngpio: max number of gpio pins
107 * @max_bank: maximum number of gpio banks
108 * @bank_min: this array represents bank's min pin
109 * @bank_max: this array represents bank's max pin
111 struct zynq_platform_data {
115 int bank_min[ZYNQMP_GPIO_MAX_BANK];
116 int bank_max[ZYNQMP_GPIO_MAX_BANK];
119 static const struct zynq_platform_data zynqmp_gpio_def = {
120 .label = "zynqmp_gpio",
121 .ngpio = ZYNQMP_GPIO_NR_GPIOS,
122 .max_bank = ZYNQMP_GPIO_MAX_BANK,
123 .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(MP),
124 .bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(MP),
125 .bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(MP),
126 .bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(MP),
127 .bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(MP),
128 .bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(MP),
129 .bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(MP),
130 .bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(MP),
131 .bank_min[4] = ZYNQ_GPIO_BANK4_PIN_MIN(MP),
132 .bank_max[4] = ZYNQ_GPIO_BANK4_PIN_MAX(MP),
133 .bank_min[5] = ZYNQ_GPIO_BANK5_PIN_MIN(MP),
134 .bank_max[5] = ZYNQ_GPIO_BANK5_PIN_MAX(MP),
137 static const struct zynq_platform_data zynq_gpio_def = {
138 .label = "zynq_gpio",
139 .ngpio = ZYNQ_GPIO_NR_GPIOS,
140 .max_bank = ZYNQ_GPIO_MAX_BANK,
141 .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(),
142 .bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(),
143 .bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(),
144 .bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(),
145 .bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(),
146 .bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(),
147 .bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(),
148 .bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(),
152 * zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank
153 * for a given pin in the GPIO device
154 * @pin_num: gpio pin number within the device
155 * @bank_num: an output parameter used to return the bank number of the gpio
157 * @bank_pin_num: an output parameter used to return pin number within a bank
158 * for the given gpio pin
160 * Returns the bank number and pin offset within the bank.
162 static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
163 unsigned int *bank_num,
164 unsigned int *bank_pin_num,
167 struct zynq_gpio_privdata *priv = dev_get_priv(dev);
170 for (bank = 0; bank < priv->p_data->max_bank; bank++) {
171 if ((pin_num >= priv->p_data->bank_min[bank]) &&
172 (pin_num <= priv->p_data->bank_max[bank])) {
174 *bank_pin_num = pin_num -
175 priv->p_data->bank_min[bank];
180 if (bank >= priv->p_data->max_bank) {
181 printf("Inavlid bank and pin num\n");
187 static int gpio_is_valid(unsigned gpio, struct udevice *dev)
189 struct zynq_gpio_privdata *priv = dev_get_priv(dev);
191 return (gpio >= 0) && (gpio < priv->p_data->ngpio);
194 static int check_gpio(unsigned gpio, struct udevice *dev)
196 if (!gpio_is_valid(gpio, dev)) {
197 printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
203 static int zynq_gpio_get_value(struct udevice *dev, unsigned gpio)
206 unsigned int bank_num, bank_pin_num;
207 struct zynq_gpio_privdata *priv = dev_get_priv(dev);
209 if (check_gpio(gpio, dev) < 0)
212 zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
214 data = readl(priv->base +
215 ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
217 return (data >> bank_pin_num) & 1;
220 static int zynq_gpio_set_value(struct udevice *dev, unsigned gpio, int value)
222 unsigned int reg_offset, bank_num, bank_pin_num;
223 struct zynq_gpio_privdata *priv = dev_get_priv(dev);
225 if (check_gpio(gpio, dev) < 0)
228 zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
230 if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) {
231 /* only 16 data bits in bit maskable reg */
232 bank_pin_num -= ZYNQ_GPIO_MID_PIN_NUM;
233 reg_offset = ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num);
235 reg_offset = ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num);
239 * get the 32 bit value to be written to the mask/data register where
240 * the upper 16 bits is the mask and lower 16 bits is the data
243 value = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) &
244 ((value << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK);
246 writel(value, priv->base + reg_offset);
251 static int zynq_gpio_direction_input(struct udevice *dev, unsigned gpio)
254 unsigned int bank_num, bank_pin_num;
255 struct zynq_gpio_privdata *priv = dev_get_priv(dev);
257 if (check_gpio(gpio, dev) < 0)
260 zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
262 /* bank 0 pins 7 and 8 are special and cannot be used as inputs */
263 if (bank_num == 0 && (bank_pin_num == 7 || bank_pin_num == 8))
266 /* clear the bit in direction mode reg to set the pin as input */
267 reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
268 reg &= ~BIT(bank_pin_num);
269 writel(reg, priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
274 static int zynq_gpio_direction_output(struct udevice *dev, unsigned gpio,
278 unsigned int bank_num, bank_pin_num;
279 struct zynq_gpio_privdata *priv = dev_get_priv(dev);
281 if (check_gpio(gpio, dev) < 0)
284 zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
286 /* set the GPIO pin as output */
287 reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
288 reg |= BIT(bank_pin_num);
289 writel(reg, priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
291 /* configure the output enable reg for the pin */
292 reg = readl(priv->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
293 reg |= BIT(bank_pin_num);
294 writel(reg, priv->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
296 /* set the state of the pin */
297 gpio_set_value(gpio, value);
301 static int zynq_gpio_get_function(struct udevice *dev, unsigned offset)
304 unsigned int bank_num, bank_pin_num;
305 struct zynq_gpio_privdata *priv = dev_get_priv(dev);
307 if (check_gpio(offset, dev) < 0)
310 zynq_gpio_get_bank_pin(offset, &bank_num, &bank_pin_num, dev);
312 /* set the GPIO pin as output */
313 reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
314 reg &= BIT(bank_pin_num);
321 static const struct dm_gpio_ops gpio_zynq_ops = {
322 .direction_input = zynq_gpio_direction_input,
323 .direction_output = zynq_gpio_direction_output,
324 .get_value = zynq_gpio_get_value,
325 .set_value = zynq_gpio_set_value,
326 .get_function = zynq_gpio_get_function,
329 static const struct udevice_id zynq_gpio_ids[] = {
330 { .compatible = "xlnx,zynq-gpio-1.0",
331 .data = (ulong)&zynq_gpio_def},
332 { .compatible = "xlnx,zynqmp-gpio-1.0",
333 .data = (ulong)&zynqmp_gpio_def},
337 static void zynq_gpio_getplat_data(struct udevice *dev)
339 const struct udevice_id *of_match = zynq_gpio_ids;
341 struct zynq_gpio_privdata *priv = dev_get_priv(dev);
343 while (of_match->compatible) {
344 ret = fdt_node_offset_by_compatible(gd->fdt_blob, -1,
345 of_match->compatible);
348 (struct zynq_platform_data *)of_match->data;
357 printf("No Platform data found\n");
360 static int zynq_gpio_probe(struct udevice *dev)
362 struct zynq_gpio_privdata *priv = dev_get_priv(dev);
363 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
365 zynq_gpio_getplat_data(dev);
368 uc_priv->gpio_count = priv->p_data->ngpio;
373 static int zynq_gpio_ofdata_to_platdata(struct udevice *dev)
375 struct zynq_gpio_privdata *priv = dev_get_priv(dev);
377 priv->base = devfdt_get_addr(dev);
382 U_BOOT_DRIVER(gpio_zynq) = {
385 .ops = &gpio_zynq_ops,
386 .of_match = zynq_gpio_ids,
387 .ofdata_to_platdata = zynq_gpio_ofdata_to_platdata,
388 .probe = zynq_gpio_probe,
389 .priv_auto_alloc_size = sizeof(struct zynq_gpio_privdata),