mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 03:26:47 +07:00
c69fcea57e
The bcm-kona gpio driver currently implements an irq_chip for handling interrupts; due to how irq_chip handling is done, it's necessary for the irq_chip methods to be invoked from hardirq context, even on a a real-time kernel. Because the spinlock_t type becomes a "sleeping" spinlock w/ RT kernels, it is not suitable to be used with irq_chips. A quick audit of the operations under the lock reveal that they do only minimal, bounded work, and are therefore safe to do under a raw spinlock. Signed-off-by: Julia Cartwright <julia@ni.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
676 lines
18 KiB
C
676 lines
18 KiB
C
/*
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* Broadcom Kona GPIO Driver
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*
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* Author: Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>
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* Copyright (C) 2012-2014 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/init.h>
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#include <linux/irqdomain.h>
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#include <linux/irqchip/chained_irq.h>
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#define BCM_GPIO_PASSWD 0x00a5a501
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#define GPIO_PER_BANK 32
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#define GPIO_MAX_BANK_NUM 8
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#define GPIO_BANK(gpio) ((gpio) >> 5)
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#define GPIO_BIT(gpio) ((gpio) & (GPIO_PER_BANK - 1))
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/* There is a GPIO control register for each GPIO */
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#define GPIO_CONTROL(gpio) (0x00000100 + ((gpio) << 2))
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/* The remaining registers are per GPIO bank */
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#define GPIO_OUT_STATUS(bank) (0x00000000 + ((bank) << 2))
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#define GPIO_IN_STATUS(bank) (0x00000020 + ((bank) << 2))
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#define GPIO_OUT_SET(bank) (0x00000040 + ((bank) << 2))
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#define GPIO_OUT_CLEAR(bank) (0x00000060 + ((bank) << 2))
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#define GPIO_INT_STATUS(bank) (0x00000080 + ((bank) << 2))
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#define GPIO_INT_MASK(bank) (0x000000a0 + ((bank) << 2))
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#define GPIO_INT_MSKCLR(bank) (0x000000c0 + ((bank) << 2))
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#define GPIO_PWD_STATUS(bank) (0x00000500 + ((bank) << 2))
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#define GPIO_GPPWR_OFFSET 0x00000520
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#define GPIO_GPCTR0_DBR_SHIFT 5
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#define GPIO_GPCTR0_DBR_MASK 0x000001e0
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#define GPIO_GPCTR0_ITR_SHIFT 3
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#define GPIO_GPCTR0_ITR_MASK 0x00000018
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#define GPIO_GPCTR0_ITR_CMD_RISING_EDGE 0x00000001
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#define GPIO_GPCTR0_ITR_CMD_FALLING_EDGE 0x00000002
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#define GPIO_GPCTR0_ITR_CMD_BOTH_EDGE 0x00000003
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#define GPIO_GPCTR0_IOTR_MASK 0x00000001
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#define GPIO_GPCTR0_IOTR_CMD_0UTPUT 0x00000000
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#define GPIO_GPCTR0_IOTR_CMD_INPUT 0x00000001
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#define GPIO_GPCTR0_DB_ENABLE_MASK 0x00000100
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#define LOCK_CODE 0xffffffff
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#define UNLOCK_CODE 0x00000000
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struct bcm_kona_gpio {
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void __iomem *reg_base;
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int num_bank;
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raw_spinlock_t lock;
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struct gpio_chip gpio_chip;
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struct irq_domain *irq_domain;
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struct bcm_kona_gpio_bank *banks;
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struct platform_device *pdev;
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};
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struct bcm_kona_gpio_bank {
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int id;
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int irq;
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/* Used in the interrupt handler */
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struct bcm_kona_gpio *kona_gpio;
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};
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static inline void bcm_kona_gpio_write_lock_regs(void __iomem *reg_base,
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int bank_id, u32 lockcode)
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{
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writel(BCM_GPIO_PASSWD, reg_base + GPIO_GPPWR_OFFSET);
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writel(lockcode, reg_base + GPIO_PWD_STATUS(bank_id));
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}
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static void bcm_kona_gpio_lock_gpio(struct bcm_kona_gpio *kona_gpio,
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unsigned gpio)
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{
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u32 val;
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unsigned long flags;
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int bank_id = GPIO_BANK(gpio);
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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val = readl(kona_gpio->reg_base + GPIO_PWD_STATUS(bank_id));
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val |= BIT(gpio);
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bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, bank_id, val);
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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}
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static void bcm_kona_gpio_unlock_gpio(struct bcm_kona_gpio *kona_gpio,
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unsigned gpio)
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{
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u32 val;
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unsigned long flags;
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int bank_id = GPIO_BANK(gpio);
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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val = readl(kona_gpio->reg_base + GPIO_PWD_STATUS(bank_id));
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val &= ~BIT(gpio);
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bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, bank_id, val);
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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}
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static int bcm_kona_gpio_get_dir(struct gpio_chip *chip, unsigned gpio)
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{
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struct bcm_kona_gpio *kona_gpio = gpiochip_get_data(chip);
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void __iomem *reg_base = kona_gpio->reg_base;
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u32 val;
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val = readl(reg_base + GPIO_CONTROL(gpio)) & GPIO_GPCTR0_IOTR_MASK;
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return val ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
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}
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static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
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{
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struct bcm_kona_gpio *kona_gpio;
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void __iomem *reg_base;
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int bank_id = GPIO_BANK(gpio);
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int bit = GPIO_BIT(gpio);
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u32 val, reg_offset;
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unsigned long flags;
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kona_gpio = gpiochip_get_data(chip);
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reg_base = kona_gpio->reg_base;
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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/* this function only applies to output pin */
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if (bcm_kona_gpio_get_dir(chip, gpio) == GPIOF_DIR_IN)
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goto out;
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reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
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val = readl(reg_base + reg_offset);
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val |= BIT(bit);
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writel(val, reg_base + reg_offset);
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out:
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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}
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static int bcm_kona_gpio_get(struct gpio_chip *chip, unsigned gpio)
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{
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struct bcm_kona_gpio *kona_gpio;
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void __iomem *reg_base;
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int bank_id = GPIO_BANK(gpio);
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int bit = GPIO_BIT(gpio);
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u32 val, reg_offset;
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unsigned long flags;
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kona_gpio = gpiochip_get_data(chip);
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reg_base = kona_gpio->reg_base;
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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if (bcm_kona_gpio_get_dir(chip, gpio) == GPIOF_DIR_IN)
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reg_offset = GPIO_IN_STATUS(bank_id);
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else
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reg_offset = GPIO_OUT_STATUS(bank_id);
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/* read the GPIO bank status */
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val = readl(reg_base + reg_offset);
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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/* return the specified bit status */
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return !!(val & BIT(bit));
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}
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static int bcm_kona_gpio_request(struct gpio_chip *chip, unsigned gpio)
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{
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struct bcm_kona_gpio *kona_gpio = gpiochip_get_data(chip);
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bcm_kona_gpio_unlock_gpio(kona_gpio, gpio);
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return 0;
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}
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static void bcm_kona_gpio_free(struct gpio_chip *chip, unsigned gpio)
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{
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struct bcm_kona_gpio *kona_gpio = gpiochip_get_data(chip);
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bcm_kona_gpio_lock_gpio(kona_gpio, gpio);
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}
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static int bcm_kona_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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struct bcm_kona_gpio *kona_gpio;
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void __iomem *reg_base;
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u32 val;
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unsigned long flags;
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kona_gpio = gpiochip_get_data(chip);
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reg_base = kona_gpio->reg_base;
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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val = readl(reg_base + GPIO_CONTROL(gpio));
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val &= ~GPIO_GPCTR0_IOTR_MASK;
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val |= GPIO_GPCTR0_IOTR_CMD_INPUT;
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writel(val, reg_base + GPIO_CONTROL(gpio));
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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return 0;
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}
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static int bcm_kona_gpio_direction_output(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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struct bcm_kona_gpio *kona_gpio;
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void __iomem *reg_base;
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int bank_id = GPIO_BANK(gpio);
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int bit = GPIO_BIT(gpio);
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u32 val, reg_offset;
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unsigned long flags;
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kona_gpio = gpiochip_get_data(chip);
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reg_base = kona_gpio->reg_base;
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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val = readl(reg_base + GPIO_CONTROL(gpio));
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val &= ~GPIO_GPCTR0_IOTR_MASK;
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val |= GPIO_GPCTR0_IOTR_CMD_0UTPUT;
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writel(val, reg_base + GPIO_CONTROL(gpio));
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reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
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val = readl(reg_base + reg_offset);
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val |= BIT(bit);
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writel(val, reg_base + reg_offset);
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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return 0;
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}
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static int bcm_kona_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
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{
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struct bcm_kona_gpio *kona_gpio;
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kona_gpio = gpiochip_get_data(chip);
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if (gpio >= kona_gpio->gpio_chip.ngpio)
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return -ENXIO;
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return irq_create_mapping(kona_gpio->irq_domain, gpio);
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}
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static int bcm_kona_gpio_set_debounce(struct gpio_chip *chip, unsigned gpio,
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unsigned debounce)
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{
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struct bcm_kona_gpio *kona_gpio;
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void __iomem *reg_base;
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u32 val, res;
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unsigned long flags;
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kona_gpio = gpiochip_get_data(chip);
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reg_base = kona_gpio->reg_base;
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/* debounce must be 1-128ms (or 0) */
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if ((debounce > 0 && debounce < 1000) || debounce > 128000) {
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dev_err(chip->parent, "Debounce value %u not in range\n",
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debounce);
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return -EINVAL;
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}
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/* calculate debounce bit value */
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if (debounce != 0) {
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/* Convert to ms */
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debounce /= 1000;
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/* find the MSB */
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res = fls(debounce) - 1;
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/* Check if MSB-1 is set (round up or down) */
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if (res > 0 && (debounce & BIT(res - 1)))
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res++;
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}
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/* spin lock for read-modify-write of the GPIO register */
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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val = readl(reg_base + GPIO_CONTROL(gpio));
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val &= ~GPIO_GPCTR0_DBR_MASK;
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if (debounce == 0) {
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/* disable debounce */
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val &= ~GPIO_GPCTR0_DB_ENABLE_MASK;
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} else {
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val |= GPIO_GPCTR0_DB_ENABLE_MASK |
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(res << GPIO_GPCTR0_DBR_SHIFT);
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}
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writel(val, reg_base + GPIO_CONTROL(gpio));
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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return 0;
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}
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static int bcm_kona_gpio_set_config(struct gpio_chip *chip, unsigned gpio,
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unsigned long config)
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{
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u32 debounce;
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if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
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return -ENOTSUPP;
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debounce = pinconf_to_config_argument(config);
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return bcm_kona_gpio_set_debounce(chip, gpio, debounce);
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}
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static const struct gpio_chip template_chip = {
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.label = "bcm-kona-gpio",
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.owner = THIS_MODULE,
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.request = bcm_kona_gpio_request,
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.free = bcm_kona_gpio_free,
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.get_direction = bcm_kona_gpio_get_dir,
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.direction_input = bcm_kona_gpio_direction_input,
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.get = bcm_kona_gpio_get,
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.direction_output = bcm_kona_gpio_direction_output,
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.set = bcm_kona_gpio_set,
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.set_config = bcm_kona_gpio_set_config,
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.to_irq = bcm_kona_gpio_to_irq,
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.base = 0,
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};
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static void bcm_kona_gpio_irq_ack(struct irq_data *d)
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{
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struct bcm_kona_gpio *kona_gpio;
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void __iomem *reg_base;
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unsigned gpio = d->hwirq;
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int bank_id = GPIO_BANK(gpio);
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int bit = GPIO_BIT(gpio);
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u32 val;
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unsigned long flags;
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kona_gpio = irq_data_get_irq_chip_data(d);
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reg_base = kona_gpio->reg_base;
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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val = readl(reg_base + GPIO_INT_STATUS(bank_id));
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val |= BIT(bit);
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writel(val, reg_base + GPIO_INT_STATUS(bank_id));
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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}
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static void bcm_kona_gpio_irq_mask(struct irq_data *d)
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{
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struct bcm_kona_gpio *kona_gpio;
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void __iomem *reg_base;
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unsigned gpio = d->hwirq;
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int bank_id = GPIO_BANK(gpio);
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int bit = GPIO_BIT(gpio);
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u32 val;
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unsigned long flags;
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kona_gpio = irq_data_get_irq_chip_data(d);
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reg_base = kona_gpio->reg_base;
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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val = readl(reg_base + GPIO_INT_MASK(bank_id));
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val |= BIT(bit);
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writel(val, reg_base + GPIO_INT_MASK(bank_id));
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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}
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static void bcm_kona_gpio_irq_unmask(struct irq_data *d)
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{
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struct bcm_kona_gpio *kona_gpio;
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void __iomem *reg_base;
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unsigned gpio = d->hwirq;
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int bank_id = GPIO_BANK(gpio);
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int bit = GPIO_BIT(gpio);
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u32 val;
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unsigned long flags;
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kona_gpio = irq_data_get_irq_chip_data(d);
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reg_base = kona_gpio->reg_base;
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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val = readl(reg_base + GPIO_INT_MSKCLR(bank_id));
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val |= BIT(bit);
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writel(val, reg_base + GPIO_INT_MSKCLR(bank_id));
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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}
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static int bcm_kona_gpio_irq_set_type(struct irq_data *d, unsigned int type)
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{
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struct bcm_kona_gpio *kona_gpio;
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void __iomem *reg_base;
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unsigned gpio = d->hwirq;
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u32 lvl_type;
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u32 val;
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unsigned long flags;
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kona_gpio = irq_data_get_irq_chip_data(d);
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reg_base = kona_gpio->reg_base;
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switch (type & IRQ_TYPE_SENSE_MASK) {
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case IRQ_TYPE_EDGE_RISING:
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lvl_type = GPIO_GPCTR0_ITR_CMD_RISING_EDGE;
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break;
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case IRQ_TYPE_EDGE_FALLING:
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lvl_type = GPIO_GPCTR0_ITR_CMD_FALLING_EDGE;
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break;
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case IRQ_TYPE_EDGE_BOTH:
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lvl_type = GPIO_GPCTR0_ITR_CMD_BOTH_EDGE;
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break;
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case IRQ_TYPE_LEVEL_HIGH:
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case IRQ_TYPE_LEVEL_LOW:
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/* BCM GPIO doesn't support level triggering */
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default:
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dev_err(kona_gpio->gpio_chip.parent,
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"Invalid BCM GPIO irq type 0x%x\n", type);
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return -EINVAL;
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}
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raw_spin_lock_irqsave(&kona_gpio->lock, flags);
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val = readl(reg_base + GPIO_CONTROL(gpio));
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val &= ~GPIO_GPCTR0_ITR_MASK;
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val |= lvl_type << GPIO_GPCTR0_ITR_SHIFT;
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writel(val, reg_base + GPIO_CONTROL(gpio));
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raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
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return 0;
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}
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static void bcm_kona_gpio_irq_handler(struct irq_desc *desc)
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{
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void __iomem *reg_base;
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int bit, bank_id;
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unsigned long sta;
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struct bcm_kona_gpio_bank *bank = irq_desc_get_handler_data(desc);
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struct irq_chip *chip = irq_desc_get_chip(desc);
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chained_irq_enter(chip, desc);
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/*
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* For bank interrupts, we can't use chip_data to store the kona_gpio
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* pointer, since GIC needs it for its own purposes. Therefore, we get
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* our pointer from the bank structure.
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*/
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reg_base = bank->kona_gpio->reg_base;
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bank_id = bank->id;
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|
|
|
while ((sta = readl(reg_base + GPIO_INT_STATUS(bank_id)) &
|
|
(~(readl(reg_base + GPIO_INT_MASK(bank_id)))))) {
|
|
for_each_set_bit(bit, &sta, 32) {
|
|
int hwirq = GPIO_PER_BANK * bank_id + bit;
|
|
int child_irq =
|
|
irq_find_mapping(bank->kona_gpio->irq_domain,
|
|
hwirq);
|
|
/*
|
|
* Clear interrupt before handler is called so we don't
|
|
* miss any interrupt occurred during executing them.
|
|
*/
|
|
writel(readl(reg_base + GPIO_INT_STATUS(bank_id)) |
|
|
BIT(bit), reg_base + GPIO_INT_STATUS(bank_id));
|
|
/* Invoke interrupt handler */
|
|
generic_handle_irq(child_irq);
|
|
}
|
|
}
|
|
|
|
chained_irq_exit(chip, desc);
|
|
}
|
|
|
|
static int bcm_kona_gpio_irq_reqres(struct irq_data *d)
|
|
{
|
|
struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d);
|
|
|
|
if (gpiochip_lock_as_irq(&kona_gpio->gpio_chip, d->hwirq)) {
|
|
dev_err(kona_gpio->gpio_chip.parent,
|
|
"unable to lock HW IRQ %lu for IRQ\n",
|
|
d->hwirq);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void bcm_kona_gpio_irq_relres(struct irq_data *d)
|
|
{
|
|
struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d);
|
|
|
|
gpiochip_unlock_as_irq(&kona_gpio->gpio_chip, d->hwirq);
|
|
}
|
|
|
|
static struct irq_chip bcm_gpio_irq_chip = {
|
|
.name = "bcm-kona-gpio",
|
|
.irq_ack = bcm_kona_gpio_irq_ack,
|
|
.irq_mask = bcm_kona_gpio_irq_mask,
|
|
.irq_unmask = bcm_kona_gpio_irq_unmask,
|
|
.irq_set_type = bcm_kona_gpio_irq_set_type,
|
|
.irq_request_resources = bcm_kona_gpio_irq_reqres,
|
|
.irq_release_resources = bcm_kona_gpio_irq_relres,
|
|
};
|
|
|
|
static struct of_device_id const bcm_kona_gpio_of_match[] = {
|
|
{ .compatible = "brcm,kona-gpio" },
|
|
{}
|
|
};
|
|
|
|
/*
|
|
* This lock class tells lockdep that GPIO irqs are in a different
|
|
* category than their parents, so it won't report false recursion.
|
|
*/
|
|
static struct lock_class_key gpio_lock_class;
|
|
|
|
static int bcm_kona_gpio_irq_map(struct irq_domain *d, unsigned int irq,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
int ret;
|
|
|
|
ret = irq_set_chip_data(irq, d->host_data);
|
|
if (ret < 0)
|
|
return ret;
|
|
irq_set_lockdep_class(irq, &gpio_lock_class);
|
|
irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip, handle_simple_irq);
|
|
irq_set_noprobe(irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bcm_kona_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
|
|
{
|
|
irq_set_chip_and_handler(irq, NULL, NULL);
|
|
irq_set_chip_data(irq, NULL);
|
|
}
|
|
|
|
static const struct irq_domain_ops bcm_kona_irq_ops = {
|
|
.map = bcm_kona_gpio_irq_map,
|
|
.unmap = bcm_kona_gpio_irq_unmap,
|
|
.xlate = irq_domain_xlate_twocell,
|
|
};
|
|
|
|
static void bcm_kona_gpio_reset(struct bcm_kona_gpio *kona_gpio)
|
|
{
|
|
void __iomem *reg_base;
|
|
int i;
|
|
|
|
reg_base = kona_gpio->reg_base;
|
|
/* disable interrupts and clear status */
|
|
for (i = 0; i < kona_gpio->num_bank; i++) {
|
|
/* Unlock the entire bank first */
|
|
bcm_kona_gpio_write_lock_regs(reg_base, i, UNLOCK_CODE);
|
|
writel(0xffffffff, reg_base + GPIO_INT_MASK(i));
|
|
writel(0xffffffff, reg_base + GPIO_INT_STATUS(i));
|
|
/* Now re-lock the bank */
|
|
bcm_kona_gpio_write_lock_regs(reg_base, i, LOCK_CODE);
|
|
}
|
|
}
|
|
|
|
static int bcm_kona_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
const struct of_device_id *match;
|
|
struct resource *res;
|
|
struct bcm_kona_gpio_bank *bank;
|
|
struct bcm_kona_gpio *kona_gpio;
|
|
struct gpio_chip *chip;
|
|
int ret;
|
|
int i;
|
|
|
|
match = of_match_device(bcm_kona_gpio_of_match, dev);
|
|
if (!match) {
|
|
dev_err(dev, "Failed to find gpio controller\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
kona_gpio = devm_kzalloc(dev, sizeof(*kona_gpio), GFP_KERNEL);
|
|
if (!kona_gpio)
|
|
return -ENOMEM;
|
|
|
|
kona_gpio->gpio_chip = template_chip;
|
|
chip = &kona_gpio->gpio_chip;
|
|
kona_gpio->num_bank = of_irq_count(dev->of_node);
|
|
if (kona_gpio->num_bank == 0) {
|
|
dev_err(dev, "Couldn't determine # GPIO banks\n");
|
|
return -ENOENT;
|
|
}
|
|
if (kona_gpio->num_bank > GPIO_MAX_BANK_NUM) {
|
|
dev_err(dev, "Too many GPIO banks configured (max=%d)\n",
|
|
GPIO_MAX_BANK_NUM);
|
|
return -ENXIO;
|
|
}
|
|
kona_gpio->banks = devm_kzalloc(dev,
|
|
kona_gpio->num_bank *
|
|
sizeof(*kona_gpio->banks), GFP_KERNEL);
|
|
if (!kona_gpio->banks)
|
|
return -ENOMEM;
|
|
|
|
kona_gpio->pdev = pdev;
|
|
platform_set_drvdata(pdev, kona_gpio);
|
|
chip->of_node = dev->of_node;
|
|
chip->ngpio = kona_gpio->num_bank * GPIO_PER_BANK;
|
|
|
|
kona_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
|
|
chip->ngpio,
|
|
&bcm_kona_irq_ops,
|
|
kona_gpio);
|
|
if (!kona_gpio->irq_domain) {
|
|
dev_err(dev, "Couldn't allocate IRQ domain\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
kona_gpio->reg_base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(kona_gpio->reg_base)) {
|
|
ret = -ENXIO;
|
|
goto err_irq_domain;
|
|
}
|
|
|
|
for (i = 0; i < kona_gpio->num_bank; i++) {
|
|
bank = &kona_gpio->banks[i];
|
|
bank->id = i;
|
|
bank->irq = platform_get_irq(pdev, i);
|
|
bank->kona_gpio = kona_gpio;
|
|
if (bank->irq < 0) {
|
|
dev_err(dev, "Couldn't get IRQ for bank %d", i);
|
|
ret = -ENOENT;
|
|
goto err_irq_domain;
|
|
}
|
|
}
|
|
|
|
dev_info(&pdev->dev, "Setting up Kona GPIO\n");
|
|
|
|
bcm_kona_gpio_reset(kona_gpio);
|
|
|
|
ret = devm_gpiochip_add_data(dev, chip, kona_gpio);
|
|
if (ret < 0) {
|
|
dev_err(dev, "Couldn't add GPIO chip -- %d\n", ret);
|
|
goto err_irq_domain;
|
|
}
|
|
for (i = 0; i < kona_gpio->num_bank; i++) {
|
|
bank = &kona_gpio->banks[i];
|
|
irq_set_chained_handler_and_data(bank->irq,
|
|
bcm_kona_gpio_irq_handler,
|
|
bank);
|
|
}
|
|
|
|
raw_spin_lock_init(&kona_gpio->lock);
|
|
|
|
return 0;
|
|
|
|
err_irq_domain:
|
|
irq_domain_remove(kona_gpio->irq_domain);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver bcm_kona_gpio_driver = {
|
|
.driver = {
|
|
.name = "bcm-kona-gpio",
|
|
.of_match_table = bcm_kona_gpio_of_match,
|
|
},
|
|
.probe = bcm_kona_gpio_probe,
|
|
};
|
|
builtin_platform_driver(bcm_kona_gpio_driver);
|