319 lines
8.4 KiB
C
319 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2003-2015 Broadcom Corporation
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* All Rights Reserved
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*/
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#include <linux/gpio/driver.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/irqchip/chained_irq.h>
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#include <linux/acpi.h>
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/*
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* XLP GPIO has multiple 32 bit registers for each feature where each register
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* controls 32 pins. So, pins up to 64 require 2 32-bit registers and up to 96
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* require 3 32-bit registers for each feature.
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* Here we only define offset of the first register for each feature. Offset of
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* the registers for pins greater than 32 can be calculated as following(Use
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* GPIO_INT_STAT as example):
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*
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* offset = (gpio / XLP_GPIO_REGSZ) * 4;
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* reg_addr = addr + offset;
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*
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* where addr is base address of the that feature register and gpio is the pin.
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*/
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#define GPIO_9XX_BYTESWAP 0X00
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#define GPIO_9XX_CTRL 0X04
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#define GPIO_9XX_OUTPUT_EN 0x14
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#define GPIO_9XX_PADDRV 0x24
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/*
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* Only for 4 interrupt enable reg are defined for now,
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* total reg available are 12.
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*/
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#define GPIO_9XX_INT_EN00 0x44
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#define GPIO_9XX_INT_EN10 0x54
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#define GPIO_9XX_INT_EN20 0x64
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#define GPIO_9XX_INT_EN30 0x74
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#define GPIO_9XX_INT_POL 0x104
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#define GPIO_9XX_INT_TYPE 0x114
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#define GPIO_9XX_INT_STAT 0x124
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/* Interrupt type register mask */
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#define XLP_GPIO_IRQ_TYPE_LVL 0x0
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#define XLP_GPIO_IRQ_TYPE_EDGE 0x1
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/* Interrupt polarity register mask */
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#define XLP_GPIO_IRQ_POL_HIGH 0x0
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#define XLP_GPIO_IRQ_POL_LOW 0x1
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#define XLP_GPIO_REGSZ 32
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#define XLP_GPIO_IRQ_BASE 768
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#define XLP_MAX_NR_GPIO 96
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struct xlp_gpio_priv {
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struct gpio_chip chip;
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DECLARE_BITMAP(gpio_enabled_mask, XLP_MAX_NR_GPIO);
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void __iomem *gpio_intr_en; /* pointer to first intr enable reg */
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void __iomem *gpio_intr_stat; /* pointer to first intr status reg */
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void __iomem *gpio_intr_type; /* pointer to first intr type reg */
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void __iomem *gpio_intr_pol; /* pointer to first intr polarity reg */
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void __iomem *gpio_out_en; /* pointer to first output enable reg */
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void __iomem *gpio_paddrv; /* pointer to first pad drive reg */
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spinlock_t lock;
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};
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static int xlp_gpio_get_reg(void __iomem *addr, unsigned gpio)
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{
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u32 pos, regset;
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pos = gpio % XLP_GPIO_REGSZ;
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regset = (gpio / XLP_GPIO_REGSZ) * 4;
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return !!(readl(addr + regset) & BIT(pos));
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}
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static void xlp_gpio_set_reg(void __iomem *addr, unsigned gpio, int state)
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{
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u32 value, pos, regset;
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pos = gpio % XLP_GPIO_REGSZ;
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regset = (gpio / XLP_GPIO_REGSZ) * 4;
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value = readl(addr + regset);
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if (state)
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value |= BIT(pos);
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else
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value &= ~BIT(pos);
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writel(value, addr + regset);
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}
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static void xlp_gpio_irq_disable(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
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__clear_bit(d->hwirq, priv->gpio_enabled_mask);
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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static void xlp_gpio_irq_mask_ack(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
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xlp_gpio_set_reg(priv->gpio_intr_stat, d->hwirq, 0x1);
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__clear_bit(d->hwirq, priv->gpio_enabled_mask);
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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static void xlp_gpio_irq_unmask(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x1);
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__set_bit(d->hwirq, priv->gpio_enabled_mask);
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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static int xlp_gpio_set_irq_type(struct irq_data *d, unsigned int type)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
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int pol, irq_type;
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switch (type) {
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case IRQ_TYPE_EDGE_RISING:
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irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
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pol = XLP_GPIO_IRQ_POL_HIGH;
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break;
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case IRQ_TYPE_EDGE_FALLING:
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irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
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pol = XLP_GPIO_IRQ_POL_LOW;
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break;
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case IRQ_TYPE_LEVEL_HIGH:
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irq_type = XLP_GPIO_IRQ_TYPE_LVL;
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pol = XLP_GPIO_IRQ_POL_HIGH;
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break;
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case IRQ_TYPE_LEVEL_LOW:
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irq_type = XLP_GPIO_IRQ_TYPE_LVL;
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pol = XLP_GPIO_IRQ_POL_LOW;
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break;
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default:
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return -EINVAL;
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}
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xlp_gpio_set_reg(priv->gpio_intr_type, d->hwirq, irq_type);
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xlp_gpio_set_reg(priv->gpio_intr_pol, d->hwirq, pol);
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return 0;
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}
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static struct irq_chip xlp_gpio_irq_chip = {
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.name = "XLP-GPIO",
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.irq_mask_ack = xlp_gpio_irq_mask_ack,
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.irq_disable = xlp_gpio_irq_disable,
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.irq_set_type = xlp_gpio_set_irq_type,
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.irq_unmask = xlp_gpio_irq_unmask,
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.flags = IRQCHIP_ONESHOT_SAFE,
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};
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static void xlp_gpio_generic_handler(struct irq_desc *desc)
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{
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struct xlp_gpio_priv *priv = irq_desc_get_handler_data(desc);
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struct irq_chip *irqchip = irq_desc_get_chip(desc);
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int gpio, regoff;
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u32 gpio_stat;
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regoff = -1;
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gpio_stat = 0;
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chained_irq_enter(irqchip, desc);
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for_each_set_bit(gpio, priv->gpio_enabled_mask, XLP_MAX_NR_GPIO) {
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if (regoff != gpio / XLP_GPIO_REGSZ) {
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regoff = gpio / XLP_GPIO_REGSZ;
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gpio_stat = readl(priv->gpio_intr_stat + regoff * 4);
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}
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if (gpio_stat & BIT(gpio % XLP_GPIO_REGSZ))
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generic_handle_domain_irq(priv->chip.irq.domain, gpio);
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}
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chained_irq_exit(irqchip, desc);
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}
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static int xlp_gpio_dir_output(struct gpio_chip *gc, unsigned gpio, int state)
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{
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struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
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BUG_ON(gpio >= gc->ngpio);
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xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x1);
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return 0;
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}
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static int xlp_gpio_dir_input(struct gpio_chip *gc, unsigned gpio)
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{
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struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
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BUG_ON(gpio >= gc->ngpio);
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xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x0);
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return 0;
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}
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static int xlp_gpio_get(struct gpio_chip *gc, unsigned gpio)
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{
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struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
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BUG_ON(gpio >= gc->ngpio);
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return xlp_gpio_get_reg(priv->gpio_paddrv, gpio);
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}
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static void xlp_gpio_set(struct gpio_chip *gc, unsigned gpio, int state)
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{
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struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
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BUG_ON(gpio >= gc->ngpio);
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xlp_gpio_set_reg(priv->gpio_paddrv, gpio, state);
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}
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static int xlp_gpio_probe(struct platform_device *pdev)
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{
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struct gpio_chip *gc;
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struct gpio_irq_chip *girq;
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struct xlp_gpio_priv *priv;
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void __iomem *gpio_base;
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int irq, err;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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gpio_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(gpio_base))
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return PTR_ERR(gpio_base);
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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priv->gpio_out_en = gpio_base + GPIO_9XX_OUTPUT_EN;
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priv->gpio_paddrv = gpio_base + GPIO_9XX_PADDRV;
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priv->gpio_intr_stat = gpio_base + GPIO_9XX_INT_STAT;
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priv->gpio_intr_type = gpio_base + GPIO_9XX_INT_TYPE;
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priv->gpio_intr_pol = gpio_base + GPIO_9XX_INT_POL;
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priv->gpio_intr_en = gpio_base + GPIO_9XX_INT_EN00;
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bitmap_zero(priv->gpio_enabled_mask, XLP_MAX_NR_GPIO);
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gc = &priv->chip;
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gc->owner = THIS_MODULE;
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gc->label = dev_name(&pdev->dev);
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gc->base = 0;
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gc->parent = &pdev->dev;
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gc->ngpio = 70;
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gc->direction_output = xlp_gpio_dir_output;
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gc->direction_input = xlp_gpio_dir_input;
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gc->set = xlp_gpio_set;
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gc->get = xlp_gpio_get;
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spin_lock_init(&priv->lock);
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girq = &gc->irq;
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girq->chip = &xlp_gpio_irq_chip;
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girq->parent_handler = xlp_gpio_generic_handler;
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girq->num_parents = 1;
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girq->parents = devm_kcalloc(&pdev->dev, 1,
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sizeof(*girq->parents),
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GFP_KERNEL);
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if (!girq->parents)
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return -ENOMEM;
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girq->parents[0] = irq;
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girq->first = 0;
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girq->default_type = IRQ_TYPE_NONE;
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girq->handler = handle_level_irq;
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err = gpiochip_add_data(gc, priv);
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if (err < 0)
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return err;
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dev_info(&pdev->dev, "registered %d GPIOs\n", gc->ngpio);
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return 0;
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}
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id xlp_gpio_acpi_match[] = {
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{ "BRCM9006" },
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{ "CAV9006" },
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{},
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};
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MODULE_DEVICE_TABLE(acpi, xlp_gpio_acpi_match);
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#endif
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static struct platform_driver xlp_gpio_driver = {
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.driver = {
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.name = "xlp-gpio",
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.acpi_match_table = ACPI_PTR(xlp_gpio_acpi_match),
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},
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.probe = xlp_gpio_probe,
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};
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module_platform_driver(xlp_gpio_driver);
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MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
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MODULE_AUTHOR("Ganesan Ramalingam <ganesanr@broadcom.com>");
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MODULE_DESCRIPTION("Netlogic XLP GPIO Driver");
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MODULE_LICENSE("GPL v2");
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