18c2ecf20Sopenharmony_ci/* 28c2ecf20Sopenharmony_ci * GPIO driver for the TS-4800 board 38c2ecf20Sopenharmony_ci * 48c2ecf20Sopenharmony_ci * Copyright (c) 2016 - Savoir-faire Linux 58c2ecf20Sopenharmony_ci * 68c2ecf20Sopenharmony_ci * This file is licensed under the terms of the GNU General Public 78c2ecf20Sopenharmony_ci * License version 2. This program is licensed "as is" without any 88c2ecf20Sopenharmony_ci * warranty of any kind, whether express or implied. 98c2ecf20Sopenharmony_ci */ 108c2ecf20Sopenharmony_ci 118c2ecf20Sopenharmony_ci#include <linux/gpio/driver.h> 128c2ecf20Sopenharmony_ci#include <linux/module.h> 138c2ecf20Sopenharmony_ci#include <linux/of_address.h> 148c2ecf20Sopenharmony_ci#include <linux/of_device.h> 158c2ecf20Sopenharmony_ci#include <linux/platform_device.h> 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_ci#define DEFAULT_PIN_NUMBER 16 188c2ecf20Sopenharmony_ci#define INPUT_REG_OFFSET 0x00 198c2ecf20Sopenharmony_ci#define OUTPUT_REG_OFFSET 0x02 208c2ecf20Sopenharmony_ci#define DIRECTION_REG_OFFSET 0x04 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_cistatic int ts4800_gpio_probe(struct platform_device *pdev) 238c2ecf20Sopenharmony_ci{ 248c2ecf20Sopenharmony_ci struct device_node *node; 258c2ecf20Sopenharmony_ci struct gpio_chip *chip; 268c2ecf20Sopenharmony_ci void __iomem *base_addr; 278c2ecf20Sopenharmony_ci int retval; 288c2ecf20Sopenharmony_ci u32 ngpios; 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_ci chip = devm_kzalloc(&pdev->dev, sizeof(struct gpio_chip), GFP_KERNEL); 318c2ecf20Sopenharmony_ci if (!chip) 328c2ecf20Sopenharmony_ci return -ENOMEM; 338c2ecf20Sopenharmony_ci 348c2ecf20Sopenharmony_ci base_addr = devm_platform_ioremap_resource(pdev, 0); 358c2ecf20Sopenharmony_ci if (IS_ERR(base_addr)) 368c2ecf20Sopenharmony_ci return PTR_ERR(base_addr); 378c2ecf20Sopenharmony_ci 388c2ecf20Sopenharmony_ci node = pdev->dev.of_node; 398c2ecf20Sopenharmony_ci if (!node) 408c2ecf20Sopenharmony_ci return -EINVAL; 418c2ecf20Sopenharmony_ci 428c2ecf20Sopenharmony_ci retval = of_property_read_u32(node, "ngpios", &ngpios); 438c2ecf20Sopenharmony_ci if (retval == -EINVAL) 448c2ecf20Sopenharmony_ci ngpios = DEFAULT_PIN_NUMBER; 458c2ecf20Sopenharmony_ci else if (retval) 468c2ecf20Sopenharmony_ci return retval; 478c2ecf20Sopenharmony_ci 488c2ecf20Sopenharmony_ci retval = bgpio_init(chip, &pdev->dev, 2, base_addr + INPUT_REG_OFFSET, 498c2ecf20Sopenharmony_ci base_addr + OUTPUT_REG_OFFSET, NULL, 508c2ecf20Sopenharmony_ci base_addr + DIRECTION_REG_OFFSET, NULL, 0); 518c2ecf20Sopenharmony_ci if (retval) { 528c2ecf20Sopenharmony_ci dev_err(&pdev->dev, "bgpio_init failed\n"); 538c2ecf20Sopenharmony_ci return retval; 548c2ecf20Sopenharmony_ci } 558c2ecf20Sopenharmony_ci 568c2ecf20Sopenharmony_ci chip->ngpio = ngpios; 578c2ecf20Sopenharmony_ci 588c2ecf20Sopenharmony_ci platform_set_drvdata(pdev, chip); 598c2ecf20Sopenharmony_ci 608c2ecf20Sopenharmony_ci return devm_gpiochip_add_data(&pdev->dev, chip, NULL); 618c2ecf20Sopenharmony_ci} 628c2ecf20Sopenharmony_ci 638c2ecf20Sopenharmony_cistatic const struct of_device_id ts4800_gpio_of_match[] = { 648c2ecf20Sopenharmony_ci { .compatible = "technologic,ts4800-gpio", }, 658c2ecf20Sopenharmony_ci {}, 668c2ecf20Sopenharmony_ci}; 678c2ecf20Sopenharmony_ciMODULE_DEVICE_TABLE(of, ts4800_gpio_of_match); 688c2ecf20Sopenharmony_ci 698c2ecf20Sopenharmony_cistatic struct platform_driver ts4800_gpio_driver = { 708c2ecf20Sopenharmony_ci .driver = { 718c2ecf20Sopenharmony_ci .name = "ts4800-gpio", 728c2ecf20Sopenharmony_ci .of_match_table = ts4800_gpio_of_match, 738c2ecf20Sopenharmony_ci }, 748c2ecf20Sopenharmony_ci .probe = ts4800_gpio_probe, 758c2ecf20Sopenharmony_ci}; 768c2ecf20Sopenharmony_ci 778c2ecf20Sopenharmony_cimodule_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe); 788c2ecf20Sopenharmony_ci 798c2ecf20Sopenharmony_ciMODULE_AUTHOR("Julien Grossholtz <julien.grossholtz@savoirfairelinux.com>"); 808c2ecf20Sopenharmony_ciMODULE_DESCRIPTION("TS4800 FPGA GPIO driver"); 818c2ecf20Sopenharmony_ciMODULE_LICENSE("GPL v2"); 82