116 lines
3.3 KiB
C
116 lines
3.3 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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void __iomem *regs;
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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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struct resource *regs_resource;
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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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regs_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hlwd->regs = devm_ioremap_resource(&pdev->dev, regs_resource);
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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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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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