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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Driver for GE FPGA based GPIO4 *5 * Author: Martyn Welch <martyn.welch@ge.com>6 *7 * 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.8 */9 10/*11 * TODO:12 *13 * Configuration of output modes (totem-pole/open-drain).14 * Interrupt configuration - interrupts are always generated, the FPGA relies15 * on the I/O interrupt controllers mask to stop them from being propagated.16 */17 18#include <linux/gpio/driver.h>19#include <linux/io.h>20#include <linux/kernel.h>21#include <linux/mod_devicetable.h>22#include <linux/module.h>23#include <linux/platform_device.h>24#include <linux/property.h>25#include <linux/slab.h>26 27#define GEF_GPIO_DIRECT 0x0028#define GEF_GPIO_IN 0x0429#define GEF_GPIO_OUT 0x0830#define GEF_GPIO_TRIG 0x0C31#define GEF_GPIO_POLAR_A 0x1032#define GEF_GPIO_POLAR_B 0x1433#define GEF_GPIO_INT_STAT 0x1834#define GEF_GPIO_OVERRUN 0x1C35#define GEF_GPIO_MODE 0x2036 37static const struct of_device_id gef_gpio_ids[] = {38 {39 .compatible = "gef,sbc610-gpio",40 .data = (void *)19,41 }, {42 .compatible = "gef,sbc310-gpio",43 .data = (void *)6,44 }, {45 .compatible = "ge,imp3a-gpio",46 .data = (void *)16,47 },48 { }49};50MODULE_DEVICE_TABLE(of, gef_gpio_ids);51 52static int __init gef_gpio_probe(struct platform_device *pdev)53{54 struct device *dev = &pdev->dev;55 struct gpio_chip *gc;56 void __iomem *regs;57 int ret;58 59 gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);60 if (!gc)61 return -ENOMEM;62 63 regs = devm_platform_ioremap_resource(pdev, 0);64 if (IS_ERR(regs))65 return PTR_ERR(regs);66 67 ret = bgpio_init(gc, dev, 4, regs + GEF_GPIO_IN, regs + GEF_GPIO_OUT,68 NULL, NULL, regs + GEF_GPIO_DIRECT,69 BGPIOF_BIG_ENDIAN_BYTE_ORDER);70 if (ret)71 return dev_err_probe(dev, ret, "bgpio_init failed\n");72 73 /* Setup pointers to chip functions */74 gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pfw", dev_fwnode(dev));75 if (!gc->label)76 return -ENOMEM;77 78 gc->base = -1;79 gc->ngpio = (uintptr_t)device_get_match_data(dev);80 81 /* This function adds a memory mapped GPIO chip */82 ret = devm_gpiochip_add_data(dev, gc, NULL);83 if (ret)84 return dev_err_probe(dev, ret, "GPIO chip registration failed\n");85 86 return 0;87};88 89static struct platform_driver gef_gpio_driver = {90 .driver = {91 .name = "gef-gpio",92 .of_match_table = gef_gpio_ids,93 },94};95module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);96 97MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");98MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");99MODULE_LICENSE("GPL");100