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/*
* Xilinx Zynq GPIO device driver
*
* Copyright (C) 2009 - 2014 Xilinx, Inc.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#define DRIVER_NAME "zynq-gpio"
/* Maximum banks */
#define ZYNQ_GPIO_MAX_BANK 4
#define ZYNQMP_GPIO_MAX_BANK 6
#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 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 ZYNQ_GPIO_NR_GPIOS 118
#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)
/* 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_OFFSET(BANK) (0x040 + (4 * BANK))
#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
/* set to differentiate zynq from zynqmp, 0=zynqmp, 1=zynq */
#define ZYNQ_GPIO_QUIRK_IS_ZYNQ BIT(0)
#define GPIO_QUIRK_DATA_RO_BUG BIT(1)
struct gpio_regs {
u32 datamsw[ZYNQMP_GPIO_MAX_BANK];
u32 datalsw[ZYNQMP_GPIO_MAX_BANK];
u32 dirm[ZYNQMP_GPIO_MAX_BANK];
u32 outen[ZYNQMP_GPIO_MAX_BANK];
u32 int_en[ZYNQMP_GPIO_MAX_BANK];
u32 int_dis[ZYNQMP_GPIO_MAX_BANK];
u32 int_type[ZYNQMP_GPIO_MAX_BANK];
u32 int_polarity[ZYNQMP_GPIO_MAX_BANK];
u32 int_any[ZYNQMP_GPIO_MAX_BANK];
};
/**
* struct zynq_gpio - gpio device private data structure
* @chip: instance of the gpio_chip
* @base_addr: base address of the GPIO device
* @clk: clock resource for this controller
* @irq: interrupt for the GPIO device
* @p_data: pointer to platform data
* @context: context registers
*/
struct zynq_gpio {
struct gpio_chip chip;
void __iomem *base_addr;
struct clk *clk;
int irq;
const struct zynq_platform_data *p_data;
struct gpio_regs context;
};
/**
* 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;
u32 quirks;
u16 ngpio;
int max_bank;
int bank_min[ZYNQMP_GPIO_MAX_BANK];
int bank_max[ZYNQMP_GPIO_MAX_BANK];
};
static struct irq_chip zynq_gpio_level_irqchip;
static struct irq_chip zynq_gpio_edge_irqchip;
/**
* zynq_gpio_is_zynq - test if HW is zynq or zynqmp
* @gpio: Pointer to driver data struct
*
* Return: 0 if zynqmp, 1 if zynq.
*/
static int zynq_gpio_is_zynq(struct zynq_gpio *gpio)
{
return !!(gpio->p_data->quirks & ZYNQ_GPIO_QUIRK_IS_ZYNQ);
}
/**
* gpio_data_ro_bug - test if HW bug exists or not
* @gpio: Pointer to driver data struct
*
* Return: 0 if bug doesnot exist, 1 if bug exists.
*/
static int gpio_data_ro_bug(struct zynq_gpio *gpio)
{
return !!(gpio->p_data->quirks & GPIO_QUIRK_DATA_RO_BUG);
}
/**
* 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 zynq_gpio *gpio)
{
int bank;
for (bank = 0; bank < gpio->p_data->max_bank; bank++) {
if ((pin_num >= gpio->p_data->bank_min[bank]) &&
(pin_num <= gpio->p_data->bank_max[bank])) {
*bank_num = bank;
*bank_pin_num = pin_num -
gpio->p_data->bank_min[bank];
return;
}
}
/* default */
WARN(true, "invalid GPIO pin number: %u", pin_num);
*bank_num = 0;
*bank_pin_num = 0;
}
/**
* zynq_gpio_get_value - Get the state of the specified pin of GPIO device
* @chip: gpio_chip instance to be worked on
* @pin: gpio pin number within the device
*
* This function reads the state of the specified pin of the GPIO device.
*
* Return: 0 if the pin is low, 1 if pin is high.
*/
static int zynq_gpio_get_value(struct gpio_chip *chip, unsigned int pin)
{
u32 data;
unsigned int bank_num, bank_pin_num;
struct zynq_gpio *gpio = gpiochip_get_data(chip);
zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
if (gpio_data_ro_bug(gpio)) {
if (zynq_gpio_is_zynq(gpio)) {
if (bank_num <= 1) {
data = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
} else {
data = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_OFFSET(bank_num));
}
} else {
if (bank_num <= 2) {
data = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
} else {
data =
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