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![Linus Walleij](/assets/img/avatar_default.png)
We need to convert all old gpio irqchips to pass the irqchip setup along when adding the gpio_chip. For more info see drivers/gpio/TODO. For chained irqchips this is a pretty straight-forward conversion. Cc: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/20190809140005.11654-1-linus.walleij@linaro.org Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Tested-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
305 lines
8.5 KiB
C
305 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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// Copyright (C) 2008-2009 The GameCube Linux Team
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// Copyright (C) 2008,2009 Albert Herranz
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// Copyright (C) 2017-2018 Jonathan Neuschäfer
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//
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// Nintendo Wii (Hollywood) GPIO driver
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#include <linux/gpio/driver.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/slab.h>
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/*
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* Register names and offsets courtesy of WiiBrew:
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* https://wiibrew.org/wiki/Hardware/Hollywood_GPIOs
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*
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* Note that for most registers, there are two versions:
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* - HW_GPIOB_* Is always accessible by the Broadway PowerPC core, but does
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* always give access to all GPIO lines
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* - HW_GPIO_* Is only accessible by the Broadway PowerPC code if the memory
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* firewall (AHBPROT) in the Hollywood chipset has been configured to allow
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* such access.
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*
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* The ownership of each GPIO line can be configured in the HW_GPIO_OWNER
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* register: A one bit configures the line for access via the HW_GPIOB_*
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* registers, a zero bit indicates access via HW_GPIO_*. This driver uses
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* HW_GPIOB_*.
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*/
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#define HW_GPIOB_OUT 0x00
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#define HW_GPIOB_DIR 0x04
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#define HW_GPIOB_IN 0x08
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#define HW_GPIOB_INTLVL 0x0c
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#define HW_GPIOB_INTFLAG 0x10
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#define HW_GPIOB_INTMASK 0x14
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#define HW_GPIOB_INMIR 0x18
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#define HW_GPIO_ENABLE 0x1c
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#define HW_GPIO_OUT 0x20
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#define HW_GPIO_DIR 0x24
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#define HW_GPIO_IN 0x28
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#define HW_GPIO_INTLVL 0x2c
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#define HW_GPIO_INTFLAG 0x30
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#define HW_GPIO_INTMASK 0x34
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#define HW_GPIO_INMIR 0x38
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#define HW_GPIO_OWNER 0x3c
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struct hlwd_gpio {
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struct gpio_chip gpioc;
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struct irq_chip irqc;
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void __iomem *regs;
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int irq;
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u32 edge_emulation;
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u32 rising_edge, falling_edge;
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};
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static void hlwd_gpio_irqhandler(struct irq_desc *desc)
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{
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struct hlwd_gpio *hlwd =
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gpiochip_get_data(irq_desc_get_handler_data(desc));
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struct irq_chip *chip = irq_desc_get_chip(desc);
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unsigned long flags;
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unsigned long pending;
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int hwirq;
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u32 emulated_pending;
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spin_lock_irqsave(&hlwd->gpioc.bgpio_lock, flags);
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pending = ioread32be(hlwd->regs + HW_GPIOB_INTFLAG);
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pending &= ioread32be(hlwd->regs + HW_GPIOB_INTMASK);
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/* Treat interrupts due to edge trigger emulation separately */
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emulated_pending = hlwd->edge_emulation & pending;
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pending &= ~emulated_pending;
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if (emulated_pending) {
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u32 level, rising, falling;
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level = ioread32be(hlwd->regs + HW_GPIOB_INTLVL);
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rising = level & emulated_pending;
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falling = ~level & emulated_pending;
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/* Invert the levels */
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iowrite32be(level ^ emulated_pending,
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hlwd->regs + HW_GPIOB_INTLVL);
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/* Ack all emulated-edge interrupts */
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iowrite32be(emulated_pending, hlwd->regs + HW_GPIOB_INTFLAG);
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/* Signal interrupts only on the correct edge */
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rising &= hlwd->rising_edge;
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falling &= hlwd->falling_edge;
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/* Mark emulated interrupts as pending */
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pending |= rising | falling;
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}
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spin_unlock_irqrestore(&hlwd->gpioc.bgpio_lock, flags);
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chained_irq_enter(chip, desc);
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for_each_set_bit(hwirq, &pending, 32) {
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int irq = irq_find_mapping(hlwd->gpioc.irq.domain, hwirq);
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generic_handle_irq(irq);
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}
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chained_irq_exit(chip, desc);
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}
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static void hlwd_gpio_irq_ack(struct irq_data *data)
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{
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struct hlwd_gpio *hlwd =
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gpiochip_get_data(irq_data_get_irq_chip_data(data));
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iowrite32be(BIT(data->hwirq), hlwd->regs + HW_GPIOB_INTFLAG);
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}
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static void hlwd_gpio_irq_mask(struct irq_data *data)
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{
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struct hlwd_gpio *hlwd =
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gpiochip_get_data(irq_data_get_irq_chip_data(data));
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unsigned long flags;
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u32 mask;
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spin_lock_irqsave(&hlwd->gpioc.bgpio_lock, flags);
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mask = ioread32be(hlwd->regs + HW_GPIOB_INTMASK);
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mask &= ~BIT(data->hwirq);
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iowrite32be(mask, hlwd->regs + HW_GPIOB_INTMASK);
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spin_unlock_irqrestore(&hlwd->gpioc.bgpio_lock, flags);
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}
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static void hlwd_gpio_irq_unmask(struct irq_data *data)
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{
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struct hlwd_gpio *hlwd =
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gpiochip_get_data(irq_data_get_irq_chip_data(data));
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unsigned long flags;
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u32 mask;
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spin_lock_irqsave(&hlwd->gpioc.bgpio_lock, flags);
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mask = ioread32be(hlwd->regs + HW_GPIOB_INTMASK);
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mask |= BIT(data->hwirq);
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iowrite32be(mask, hlwd->regs + HW_GPIOB_INTMASK);
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spin_unlock_irqrestore(&hlwd->gpioc.bgpio_lock, flags);
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}
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static void hlwd_gpio_irq_enable(struct irq_data *data)
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{
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hlwd_gpio_irq_ack(data);
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hlwd_gpio_irq_unmask(data);
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}
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static void hlwd_gpio_irq_setup_emulation(struct hlwd_gpio *hlwd, int hwirq,
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unsigned int flow_type)
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{
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u32 level, state;
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/* Set the trigger level to the inactive level */
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level = ioread32be(hlwd->regs + HW_GPIOB_INTLVL);
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state = ioread32be(hlwd->regs + HW_GPIOB_IN) & BIT(hwirq);
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level &= ~BIT(hwirq);
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level |= state ^ BIT(hwirq);
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iowrite32be(level, hlwd->regs + HW_GPIOB_INTLVL);
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hlwd->edge_emulation |= BIT(hwirq);
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hlwd->rising_edge &= ~BIT(hwirq);
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hlwd->falling_edge &= ~BIT(hwirq);
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if (flow_type & IRQ_TYPE_EDGE_RISING)
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hlwd->rising_edge |= BIT(hwirq);
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if (flow_type & IRQ_TYPE_EDGE_FALLING)
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hlwd->falling_edge |= BIT(hwirq);
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}
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static int hlwd_gpio_irq_set_type(struct irq_data *data, unsigned int flow_type)
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{
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struct hlwd_gpio *hlwd =
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gpiochip_get_data(irq_data_get_irq_chip_data(data));
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unsigned long flags;
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u32 level;
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spin_lock_irqsave(&hlwd->gpioc.bgpio_lock, flags);
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hlwd->edge_emulation &= ~BIT(data->hwirq);
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switch (flow_type) {
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case IRQ_TYPE_LEVEL_HIGH:
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level = ioread32be(hlwd->regs + HW_GPIOB_INTLVL);
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level |= BIT(data->hwirq);
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iowrite32be(level, hlwd->regs + HW_GPIOB_INTLVL);
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break;
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case IRQ_TYPE_LEVEL_LOW:
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level = ioread32be(hlwd->regs + HW_GPIOB_INTLVL);
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level &= ~BIT(data->hwirq);
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iowrite32be(level, hlwd->regs + HW_GPIOB_INTLVL);
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break;
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case IRQ_TYPE_EDGE_RISING:
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case IRQ_TYPE_EDGE_FALLING:
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case IRQ_TYPE_EDGE_BOTH:
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hlwd_gpio_irq_setup_emulation(hlwd, data->hwirq, flow_type);
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break;
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default:
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spin_unlock_irqrestore(&hlwd->gpioc.bgpio_lock, flags);
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return -EINVAL;
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}
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spin_unlock_irqrestore(&hlwd->gpioc.bgpio_lock, flags);
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return 0;
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}
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static int hlwd_gpio_probe(struct platform_device *pdev)
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{
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struct hlwd_gpio *hlwd;
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u32 ngpios;
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int res;
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hlwd = devm_kzalloc(&pdev->dev, sizeof(*hlwd), GFP_KERNEL);
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if (!hlwd)
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return -ENOMEM;
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hlwd->regs = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(hlwd->regs))
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return PTR_ERR(hlwd->regs);
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/*
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* Claim all GPIOs using the OWNER register. This will not work on
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* systems where the AHBPROT memory firewall hasn't been configured to
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* permit PPC access to HW_GPIO_*.
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*
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* Note that this has to happen before bgpio_init reads the
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* HW_GPIOB_OUT and HW_GPIOB_DIR, because otherwise it reads the wrong
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* values.
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*/
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iowrite32be(0xffffffff, hlwd->regs + HW_GPIO_OWNER);
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res = bgpio_init(&hlwd->gpioc, &pdev->dev, 4,
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hlwd->regs + HW_GPIOB_IN, hlwd->regs + HW_GPIOB_OUT,
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NULL, hlwd->regs + HW_GPIOB_DIR, NULL,
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BGPIOF_BIG_ENDIAN_BYTE_ORDER);
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if (res < 0) {
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dev_warn(&pdev->dev, "bgpio_init failed: %d\n", res);
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return res;
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}
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res = of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios);
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if (res)
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ngpios = 32;
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hlwd->gpioc.ngpio = ngpios;
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/* Mask and ack all interrupts */
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iowrite32be(0, hlwd->regs + HW_GPIOB_INTMASK);
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iowrite32be(0xffffffff, hlwd->regs + HW_GPIOB_INTFLAG);
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/*
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* If this GPIO controller is not marked as an interrupt controller in
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* the DT, skip interrupt support.
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*/
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if (of_property_read_bool(pdev->dev.of_node, "interrupt-controller")) {
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struct gpio_irq_chip *girq;
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hlwd->irq = platform_get_irq(pdev, 0);
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if (hlwd->irq < 0) {
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dev_info(&pdev->dev, "platform_get_irq returned %d\n",
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hlwd->irq);
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return hlwd->irq;
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}
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hlwd->irqc.name = dev_name(&pdev->dev);
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hlwd->irqc.irq_mask = hlwd_gpio_irq_mask;
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hlwd->irqc.irq_unmask = hlwd_gpio_irq_unmask;
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hlwd->irqc.irq_enable = hlwd_gpio_irq_enable;
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hlwd->irqc.irq_set_type = hlwd_gpio_irq_set_type;
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girq = &hlwd->gpioc.irq;
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girq->chip = &hlwd->irqc;
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girq->parent_handler = hlwd_gpio_irqhandler;
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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] = hlwd->irq;
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girq->default_type = IRQ_TYPE_NONE;
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girq->handler = handle_level_irq;
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}
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return devm_gpiochip_add_data(&pdev->dev, &hlwd->gpioc, hlwd);
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}
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static const struct of_device_id hlwd_gpio_match[] = {
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{ .compatible = "nintendo,hollywood-gpio", },
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{},
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};
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MODULE_DEVICE_TABLE(of, hlwd_gpio_match);
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static struct platform_driver hlwd_gpio_driver = {
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.driver = {
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.name = "gpio-hlwd",
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.of_match_table = hlwd_gpio_match,
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},
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.probe = hlwd_gpio_probe,
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};
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module_platform_driver(hlwd_gpio_driver);
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MODULE_AUTHOR("Jonathan Neuschäfer <j.neuschaefer@gmx.net>");
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MODULE_DESCRIPTION("Nintendo Wii GPIO driver");
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MODULE_LICENSE("GPL");
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