Newer
Older
/*
* Xilinx Zynq GPIO device driver
*
* Copyright (C) 2015 DAVE Embedded Systems <devel@dave.eu>
*
* Most of code taken from linux kernel driver (linux/drivers/gpio/gpio-zynq.c)
* Copyright (C) 2009 - 2014 Xilinx, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <linux/errno.h>
#include <dm.h>
#include <fdtdec.h>
DECLARE_GLOBAL_DATA_PTR;
/* Maximum banks */
#define ZYNQ_GPIO_MAX_BANK 4
#define ZYNQ_GPIO_BANK0_NGPIO 32
#define ZYNQ_GPIO_BANK1_NGPIO 22
#define ZYNQ_GPIO_BANK2_NGPIO 32
#define ZYNQ_GPIO_BANK3_NGPIO 32
#define ZYNQ_GPIO_NR_GPIOS (ZYNQ_GPIO_BANK0_NGPIO + \
ZYNQ_GPIO_BANK1_NGPIO + \
ZYNQ_GPIO_BANK2_NGPIO + \
ZYNQ_GPIO_BANK3_NGPIO)
#define ZYNQMP_GPIO_MAX_BANK 6
#define ZYNQMP_GPIO_BANK0_NGPIO 26
#define ZYNQMP_GPIO_BANK1_NGPIO 26
#define ZYNQMP_GPIO_BANK2_NGPIO 26
#define ZYNQMP_GPIO_BANK3_NGPIO 32
#define ZYNQMP_GPIO_BANK4_NGPIO 32
#define ZYNQMP_GPIO_BANK5_NGPIO 32
#define ZYNQMP_GPIO_NR_GPIOS 174
#define ZYNQ_GPIO_BANK0_PIN_MIN(str) 0
#define ZYNQ_GPIO_BANK0_PIN_MAX(str) (ZYNQ_GPIO_BANK0_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK0_NGPIO - 1)
#define ZYNQ_GPIO_BANK1_PIN_MIN(str) (ZYNQ_GPIO_BANK0_PIN_MAX(str) + 1)
#define ZYNQ_GPIO_BANK1_PIN_MAX(str) (ZYNQ_GPIO_BANK1_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK1_NGPIO - 1)
#define ZYNQ_GPIO_BANK2_PIN_MIN(str) (ZYNQ_GPIO_BANK1_PIN_MAX(str) + 1)
#define ZYNQ_GPIO_BANK2_PIN_MAX(str) (ZYNQ_GPIO_BANK2_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK2_NGPIO - 1)
#define ZYNQ_GPIO_BANK3_PIN_MIN(str) (ZYNQ_GPIO_BANK2_PIN_MAX(str) + 1)
#define ZYNQ_GPIO_BANK3_PIN_MAX(str) (ZYNQ_GPIO_BANK3_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK3_NGPIO - 1)
#define ZYNQ_GPIO_BANK4_PIN_MIN(str) (ZYNQ_GPIO_BANK3_PIN_MAX(str) + 1)
#define ZYNQ_GPIO_BANK4_PIN_MAX(str) (ZYNQ_GPIO_BANK4_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK4_NGPIO - 1)
#define ZYNQ_GPIO_BANK5_PIN_MIN(str) (ZYNQ_GPIO_BANK4_PIN_MAX(str) + 1)
#define ZYNQ_GPIO_BANK5_PIN_MAX(str) (ZYNQ_GPIO_BANK5_PIN_MIN(str) + \
ZYNQ##str##_GPIO_BANK5_NGPIO - 1)
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
/* Register offsets for the GPIO device */
/* LSW Mask & Data -WO */
#define ZYNQ_GPIO_DATA_LSW_OFFSET(BANK) (0x000 + (8 * BANK))
/* MSW Mask & Data -WO */
#define ZYNQ_GPIO_DATA_MSW_OFFSET(BANK) (0x004 + (8 * BANK))
/* Data Register-RW */
#define ZYNQ_GPIO_DATA_RO_OFFSET(BANK) (0x060 + (4 * BANK))
/* Direction mode reg-RW */
#define ZYNQ_GPIO_DIRM_OFFSET(BANK) (0x204 + (0x40 * BANK))
/* Output enable reg-RW */
#define ZYNQ_GPIO_OUTEN_OFFSET(BANK) (0x208 + (0x40 * BANK))
/* Interrupt mask reg-RO */
#define ZYNQ_GPIO_INTMASK_OFFSET(BANK) (0x20C + (0x40 * BANK))
/* Interrupt enable reg-WO */
#define ZYNQ_GPIO_INTEN_OFFSET(BANK) (0x210 + (0x40 * BANK))
/* Interrupt disable reg-WO */
#define ZYNQ_GPIO_INTDIS_OFFSET(BANK) (0x214 + (0x40 * BANK))
/* Interrupt status reg-RO */
#define ZYNQ_GPIO_INTSTS_OFFSET(BANK) (0x218 + (0x40 * BANK))
/* Interrupt type reg-RW */
#define ZYNQ_GPIO_INTTYPE_OFFSET(BANK) (0x21C + (0x40 * BANK))
/* Interrupt polarity reg-RW */
#define ZYNQ_GPIO_INTPOL_OFFSET(BANK) (0x220 + (0x40 * BANK))
/* Interrupt on any, reg-RW */
#define ZYNQ_GPIO_INTANY_OFFSET(BANK) (0x224 + (0x40 * BANK))
/* Disable all interrupts mask */
#define ZYNQ_GPIO_IXR_DISABLE_ALL 0xFFFFFFFF
/* Mid pin number of a bank */
#define ZYNQ_GPIO_MID_PIN_NUM 16
/* GPIO upper 16 bit mask */
#define ZYNQ_GPIO_UPPER_MASK 0xFFFF0000
struct zynq_gpio_privdata {
phys_addr_t base;
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
const struct zynq_platform_data *p_data;
};
/**
* struct zynq_platform_data - zynq gpio platform data structure
* @label: string to store in gpio->label
* @ngpio: max number of gpio pins
* @max_bank: maximum number of gpio banks
* @bank_min: this array represents bank's min pin
* @bank_max: this array represents bank's max pin
*/
struct zynq_platform_data {
const char *label;
u16 ngpio;
int max_bank;
int bank_min[ZYNQMP_GPIO_MAX_BANK];
int bank_max[ZYNQMP_GPIO_MAX_BANK];
};
static const struct zynq_platform_data zynqmp_gpio_def = {
.label = "zynqmp_gpio",
.ngpio = ZYNQMP_GPIO_NR_GPIOS,
.max_bank = ZYNQMP_GPIO_MAX_BANK,
.bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(MP),
.bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(MP),
.bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(MP),
.bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(MP),
.bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(MP),
.bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(MP),
.bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(MP),
.bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(MP),
.bank_min[4] = ZYNQ_GPIO_BANK4_PIN_MIN(MP),
.bank_max[4] = ZYNQ_GPIO_BANK4_PIN_MAX(MP),
.bank_min[5] = ZYNQ_GPIO_BANK5_PIN_MIN(MP),
.bank_max[5] = ZYNQ_GPIO_BANK5_PIN_MAX(MP),
};
static const struct zynq_platform_data zynq_gpio_def = {
.label = "zynq_gpio",
.ngpio = ZYNQ_GPIO_NR_GPIOS,
.max_bank = ZYNQ_GPIO_MAX_BANK,
.bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(),
.bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(),
.bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(),
.bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(),
.bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(),
.bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(),
.bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(),
.bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(),
/**
* zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank
* for a given pin in the GPIO device
* @pin_num: gpio pin number within the device
* @bank_num: an output parameter used to return the bank number of the gpio
* pin
* @bank_pin_num: an output parameter used to return pin number within a bank
* for the given gpio pin
*
* Returns the bank number and pin offset within the bank.
*/
static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
unsigned int *bank_num,
unsigned int *bank_pin_num,
struct udevice *dev)
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
int bank;
for (bank = 0; bank < priv->p_data->max_bank; bank++) {
if ((pin_num >= priv->p_data->bank_min[bank]) &&
(pin_num <= priv->p_data->bank_max[bank])) {
*bank_num = bank;
*bank_pin_num = pin_num -
priv->p_data->bank_min[bank];
return;
}
}
if (bank >= priv->p_data->max_bank) {
printf("Inavlid bank and pin num\n");
*bank_num = 0;
*bank_pin_num = 0;
}
}
static int gpio_is_valid(unsigned gpio, struct udevice *dev)
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
return (gpio >= 0) && (gpio < priv->p_data->ngpio);
static int check_gpio(unsigned gpio, struct udevice *dev)
if (!gpio_is_valid(gpio, dev)) {
printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
return -1;
}
return 0;
}
static int zynq_gpio_get_value(struct udevice *dev, unsigned gpio)
{
u32 data;
unsigned int bank_num, bank_pin_num;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
if (check_gpio(gpio, dev) < 0)
return -1;
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
data = readl(priv->base +
ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
return (data >> bank_pin_num) & 1;
}
static int zynq_gpio_set_value(struct udevice *dev, unsigned gpio, int value)
{
unsigned int reg_offset, bank_num, bank_pin_num;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
if (check_gpio(gpio, dev) < 0)
return -1;
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) {
/* only 16 data bits in bit maskable reg */
bank_pin_num -= ZYNQ_GPIO_MID_PIN_NUM;
reg_offset = ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num);
} else {
reg_offset = ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num);
}
/*
* get the 32 bit value to be written to the mask/data register where
* the upper 16 bits is the mask and lower 16 bits is the data
*/
value = !!value;
value = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) &
((value << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK);
writel(value, priv->base + reg_offset);
return 0;
}
static int zynq_gpio_direction_input(struct udevice *dev, unsigned gpio)
{
u32 reg;
unsigned int bank_num, bank_pin_num;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
if (check_gpio(gpio, dev) < 0)
return -1;
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
/* bank 0 pins 7 and 8 are special and cannot be used as inputs */
if (bank_num == 0 && (bank_pin_num == 7 || bank_pin_num == 8))
return -1;
/* clear the bit in direction mode reg to set the pin as input */
reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
reg &= ~BIT(bank_pin_num);
writel(reg, priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
return 0;
}
static int zynq_gpio_direction_output(struct udevice *dev, unsigned gpio,
int value)
{
u32 reg;
unsigned int bank_num, bank_pin_num;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
if (check_gpio(gpio, dev) < 0)
return -1;
zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num, dev);
/* set the GPIO pin as output */
reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
reg |= BIT(bank_pin_num);
writel(reg, priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
/* configure the output enable reg for the pin */
reg = readl(priv->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
reg |= BIT(bank_pin_num);
writel(reg, priv->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
/* set the state of the pin */
gpio_set_value(gpio, value);
return 0;
}
static int zynq_gpio_get_function(struct udevice *dev, unsigned offset)
{
u32 reg;
unsigned int bank_num, bank_pin_num;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
if (check_gpio(offset, dev) < 0)
return -1;
zynq_gpio_get_bank_pin(offset, &bank_num, &bank_pin_num, dev);
/* set the GPIO pin as output */
reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
reg &= BIT(bank_pin_num);
if (reg)
return GPIOF_OUTPUT;
else
return GPIOF_INPUT;
}
static const struct dm_gpio_ops gpio_zynq_ops = {
.direction_input = zynq_gpio_direction_input,
.direction_output = zynq_gpio_direction_output,
.get_value = zynq_gpio_get_value,
.set_value = zynq_gpio_set_value,
.get_function = zynq_gpio_get_function,
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
static const struct udevice_id zynq_gpio_ids[] = {
{ .compatible = "xlnx,zynq-gpio-1.0",
.data = (ulong)&zynq_gpio_def},
{ .compatible = "xlnx,zynqmp-gpio-1.0",
.data = (ulong)&zynqmp_gpio_def},
{ }
};
static void zynq_gpio_getplat_data(struct udevice *dev)
{
const struct udevice_id *of_match = zynq_gpio_ids;
int ret;
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
while (of_match->compatible) {
ret = fdt_node_offset_by_compatible(gd->fdt_blob, -1,
of_match->compatible);
if (ret >= 0) {
priv->p_data =
(struct zynq_platform_data *)of_match->data;
break;
} else {
of_match++;
continue;
}
}
if (!priv->p_data)
printf("No Platform data found\n");
}
static int zynq_gpio_probe(struct udevice *dev)
{
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
zynq_gpio_getplat_data(dev);
if (priv->p_data)
uc_priv->gpio_count = priv->p_data->ngpio;
return 0;
}
static int zynq_gpio_ofdata_to_platdata(struct udevice *dev)
{
struct zynq_gpio_privdata *priv = dev_get_priv(dev);
priv->base = dev_get_addr(dev);
return 0;
}
U_BOOT_DRIVER(gpio_zynq) = {
.name = "gpio_zynq",
.id = UCLASS_GPIO,
.ops = &gpio_zynq_ops,
.of_match = zynq_gpio_ids,
.ofdata_to_platdata = zynq_gpio_ofdata_to_platdata,
.probe = zynq_gpio_probe,
.priv_auto_alloc_size = sizeof(struct zynq_gpio_privdata),
};