100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for GE FPGA based GPIO
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*
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* Author: Martyn Welch <martyn.welch@ge.com>
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*
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* 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
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*/
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/*
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* TODO:
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*
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* Configuration of output modes (totem-pole/open-drain).
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* Interrupt configuration - interrupts are always generated, the FPGA relies
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* on the I/O interrupt controllers mask to stop them from being propagated.
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*/
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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/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#define GEF_GPIO_DIRECT 0x00
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#define GEF_GPIO_IN 0x04
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#define GEF_GPIO_OUT 0x08
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#define GEF_GPIO_TRIG 0x0C
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#define GEF_GPIO_POLAR_A 0x10
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#define GEF_GPIO_POLAR_B 0x14
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#define GEF_GPIO_INT_STAT 0x18
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#define GEF_GPIO_OVERRUN 0x1C
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#define GEF_GPIO_MODE 0x20
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static const struct of_device_id gef_gpio_ids[] = {
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{
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.compatible = "gef,sbc610-gpio",
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.data = (void *)19,
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}, {
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.compatible = "gef,sbc310-gpio",
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.data = (void *)6,
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}, {
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.compatible = "ge,imp3a-gpio",
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.data = (void *)16,
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},
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{ }
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};
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MODULE_DEVICE_TABLE(of, gef_gpio_ids);
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static int __init gef_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct gpio_chip *gc;
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void __iomem *regs;
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int ret;
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gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
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if (!gc)
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return -ENOMEM;
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regs = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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ret = bgpio_init(gc, dev, 4, regs + GEF_GPIO_IN, regs + GEF_GPIO_OUT,
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NULL, NULL, regs + GEF_GPIO_DIRECT,
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BGPIOF_BIG_ENDIAN_BYTE_ORDER);
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if (ret)
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return dev_err_probe(dev, ret, "bgpio_init failed\n");
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/* Setup pointers to chip functions */
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gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pfw", dev_fwnode(dev));
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if (!gc->label)
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return -ENOMEM;
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gc->base = -1;
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gc->ngpio = (uintptr_t)device_get_match_data(dev);
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/* This function adds a memory mapped GPIO chip */
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ret = devm_gpiochip_add_data(dev, gc, NULL);
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if (ret)
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return dev_err_probe(dev, ret, "GPIO chip registration failed\n");
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return 0;
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};
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static struct platform_driver gef_gpio_driver = {
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.driver = {
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.name = "gef-gpio",
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.of_match_table = gef_gpio_ids,
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},
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};
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module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
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MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
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MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");
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MODULE_LICENSE("GPL");
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