1139826Simp// SPDX-License-Identifier: GPL-2.0-only 253541Sshin/* 353541Sshin * linux/drivers/gpio/gpio-mb86s7x.c 453541Sshin * 553541Sshin * Copyright (C) 2015 Fujitsu Semiconductor Limited 653541Sshin * Copyright (C) 2015 Linaro Ltd. 753541Sshin */ 853541Sshin 953541Sshin#include <linux/acpi.h> 1053541Sshin#include <linux/io.h> 1153541Sshin#include <linux/init.h> 1253541Sshin#include <linux/clk.h> 1353541Sshin#include <linux/mod_devicetable.h> 1453541Sshin#include <linux/module.h> 1553541Sshin#include <linux/err.h> 1653541Sshin#include <linux/errno.h> 1753541Sshin#include <linux/ioport.h> 1853541Sshin#include <linux/gpio/driver.h> 1953541Sshin#include <linux/platform_device.h> 2053541Sshin#include <linux/spinlock.h> 2153541Sshin#include <linux/slab.h> 2253541Sshin 2353541Sshin#include "gpiolib-acpi.h" 2453541Sshin 2553541Sshin/* 2653541Sshin * Only first 8bits of a register correspond to each pin, 2753541Sshin * so there are 4 registers for 32 pins. 2853541Sshin */ 2953541Sshin#define PDR(x) (0x0 + x / 8 * 4) 30139826Simp#define DDR(x) (0x10 + x / 8 * 4) 3153541Sshin#define PFR(x) (0x20 + x / 8 * 4) 32180305Srwatson 33180305Srwatson#define OFFSET(x) BIT((x) % 8) 3453541Sshin 3553541Sshinstruct mb86s70_gpio_chip { 3653541Sshin struct gpio_chip gc; 3753541Sshin void __iomem *base; 3853541Sshin struct clk *clk; 3953541Sshin spinlock_t lock; 4053541Sshin}; 4153541Sshin 4253541Sshinstatic int mb86s70_gpio_request(struct gpio_chip *gc, unsigned gpio) 4353541Sshin{ 4453541Sshin struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 4553541Sshin unsigned long flags; 4653541Sshin u32 val; 4753541Sshin 4853541Sshin spin_lock_irqsave(&gchip->lock, flags); 4953541Sshin 5053541Sshin val = readl(gchip->base + PFR(gpio)); 5153541Sshin val &= ~OFFSET(gpio); 5253541Sshin writel(val, gchip->base + PFR(gpio)); 5353541Sshin 5453541Sshin spin_unlock_irqrestore(&gchip->lock, flags); 5553541Sshin 5653541Sshin return 0; 5753541Sshin} 5853541Sshin 5953541Sshinstatic void mb86s70_gpio_free(struct gpio_chip *gc, unsigned gpio) 6053541Sshin{ 6153541Sshin struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 62174510Sobrien unsigned long flags; 63174510Sobrien u32 val; 64174510Sobrien 6555009Sshin spin_lock_irqsave(&gchip->lock, flags); 6678064Sume 6755009Sshin val = readl(gchip->base + PFR(gpio)); 6853541Sshin val |= OFFSET(gpio); 6995759Stanimura writel(val, gchip->base + PFR(gpio)); 70185435Sbz 7195759Stanimura spin_unlock_irqrestore(&gchip->lock, flags); 7253541Sshin} 7395759Stanimura 74170689Srwatsonstatic int mb86s70_gpio_direction_input(struct gpio_chip *gc, unsigned gpio) 7553541Sshin{ 7695759Stanimura struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 7795759Stanimura unsigned long flags; 7853541Sshin unsigned char val; 7953541Sshin 8095759Stanimura spin_lock_irqsave(&gchip->lock, flags); 81148385Sume 8253541Sshin val = readl(gchip->base + DDR(gpio)); 8353541Sshin val &= ~OFFSET(gpio); 8495759Stanimura writel(val, gchip->base + DDR(gpio)); 8553541Sshin 86185571Sbz spin_unlock_irqrestore(&gchip->lock, flags); 8753541Sshin 8853541Sshin return 0; 8953541Sshin} 9053541Sshin 91185571Sbzstatic int mb86s70_gpio_direction_output(struct gpio_chip *gc, 92185571Sbz unsigned gpio, int value) 9395759Stanimura{ 9462587Sitojun struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 95211501Sanchie unsigned long flags; 9695759Stanimura unsigned char val; 9756723Sshin 9853541Sshin spin_lock_irqsave(&gchip->lock, flags); 9995759Stanimura 10053541Sshin val = readl(gchip->base + PDR(gpio)); 10195759Stanimura if (value) 10262587Sitojun val |= OFFSET(gpio); 103211501Sanchie else 10453541Sshin val &= ~OFFSET(gpio); 105171167Sgnn writel(val, gchip->base + PDR(gpio)); 106105199Ssam 107105199Ssam val = readl(gchip->base + DDR(gpio)); 108171167Sgnn val |= OFFSET(gpio); 109105199Ssam writel(val, gchip->base + DDR(gpio)); 11053541Sshin 11153541Sshin spin_unlock_irqrestore(&gchip->lock, flags); 11253541Sshin 11353541Sshin return 0; 11453541Sshin} 11553541Sshin 11653541Sshinstatic int mb86s70_gpio_get(struct gpio_chip *gc, unsigned gpio) 11753541Sshin{ 11853541Sshin struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 119195699Srwatson 120195699Srwatson return !!(readl(gchip->base + PDR(gpio)) & OFFSET(gpio)); 121195727Srwatson} 122195727Srwatson 123185348Szecstatic void mb86s70_gpio_set(struct gpio_chip *gc, unsigned gpio, int value) 12453541Sshin{ 12553541Sshin struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 12653541Sshin unsigned long flags; 127207369Sbz unsigned char val; 128207369Sbz 12953541Sshin spin_lock_irqsave(&gchip->lock, flags); 130191672Sbms 131191672Sbms val = readl(gchip->base + PDR(gpio)); 132166938Sbms if (value) 133191672Sbms val |= OFFSET(gpio); 134191672Sbms else 135191672Sbms val &= ~OFFSET(gpio); 136191672Sbms writel(val, gchip->base + PDR(gpio)); 137195699Srwatson 138191672Sbms spin_unlock_irqrestore(&gchip->lock, flags); 139191672Sbms} 140191672Sbms 141191672Sbmsstatic int mb86s70_gpio_to_irq(struct gpio_chip *gc, unsigned int offset) 142166938Sbms{ 143166938Sbms int irq, index; 144166938Sbms 145166938Sbms for (index = 0;; index++) { 146194581Srdivacky irq = platform_get_irq(to_platform_device(gc->parent), index); 147166938Sbms if (irq < 0) 148166938Sbms return irq; 149180305Srwatson if (irq == 0) 150180305Srwatson break; 15153541Sshin if (irq_get_irq_data(irq)->hwirq == offset) 15253541Sshin return irq; 153171259Sdelphij } 15453541Sshin return -EINVAL; 155191672Sbms} 15653541Sshin 15753541Sshinstatic int mb86s70_gpio_probe(struct platform_device *pdev) 15853541Sshin{ 15953541Sshin struct mb86s70_gpio_chip *gchip; 16078064Sume int ret; 161121901Sume 16253541Sshin gchip = devm_kzalloc(&pdev->dev, sizeof(*gchip), GFP_KERNEL); 163181803Sbz if (gchip == NULL) 16478064Sume return -ENOMEM; 16583934Sbrooks 166180305Srwatson platform_set_drvdata(pdev, gchip); 16778064Sume 168180305Srwatson gchip->base = devm_platform_ioremap_resource(pdev, 0); 16953541Sshin if (IS_ERR(gchip->base)) 17078064Sume return PTR_ERR(gchip->base); 171121901Sume 17253541Sshin gchip->clk = devm_clk_get_optional(&pdev->dev, NULL); 173191672Sbms if (IS_ERR(gchip->clk)) 174191672Sbms return PTR_ERR(gchip->clk); 175181803Sbz 176181803Sbz ret = clk_prepare_enable(gchip->clk); 177185435Sbz if (ret) 178186141Sbz return ret; 17953541Sshin 180186141Sbz spin_lock_init(&gchip->lock); 181186141Sbz 182180850Smav gchip->gc.direction_output = mb86s70_gpio_direction_output; 18353541Sshin gchip->gc.direction_input = mb86s70_gpio_direction_input; 18453541Sshin gchip->gc.request = mb86s70_gpio_request; 185180850Smav gchip->gc.free = mb86s70_gpio_free; 18653541Sshin gchip->gc.get = mb86s70_gpio_get; 18753541Sshin gchip->gc.set = mb86s70_gpio_set; 188180850Smav gchip->gc.to_irq = mb86s70_gpio_to_irq; 189200473Sbz gchip->gc.label = dev_name(&pdev->dev); 190191672Sbms gchip->gc.ngpio = 32; 191191672Sbms gchip->gc.owner = THIS_MODULE; 192191672Sbms gchip->gc.parent = &pdev->dev; 193191672Sbms gchip->gc.base = -1; 194191672Sbms 195191672Sbms ret = gpiochip_add_data(&gchip->gc, gchip); 196191672Sbms if (ret) { 197191672Sbms dev_err(&pdev->dev, "couldn't register gpio driver\n"); 198191672Sbms clk_disable_unprepare(gchip->clk); 199191672Sbms return ret; 20078064Sume } 201181803Sbz 202151459Ssuz acpi_gpiochip_request_interrupts(&gchip->gc); 20378064Sume 204180932Smav return 0; 205181803Sbz} 206180850Smav 20778064Sumestatic void mb86s70_gpio_remove(struct platform_device *pdev) 20853541Sshin{ 209191672Sbms struct mb86s70_gpio_chip *gchip = platform_get_drvdata(pdev); 210191672Sbms 211191672Sbms acpi_gpiochip_free_interrupts(&gchip->gc); 212191672Sbms gpiochip_remove(&gchip->gc); 213191672Sbms clk_disable_unprepare(gchip->clk); 214191672Sbms} 215191672Sbms 216191672Sbmsstatic const struct of_device_id mb86s70_gpio_dt_ids[] = { 217191672Sbms { .compatible = "fujitsu,mb86s70-gpio" }, 218199518Sbms { /* sentinel */ } 219199518Sbms}; 220199518SbmsMODULE_DEVICE_TABLE(of, mb86s70_gpio_dt_ids); 221199518Sbms 222199518Sbms#ifdef CONFIG_ACPI 223199518Sbmsstatic const struct acpi_device_id mb86s70_gpio_acpi_ids[] = { 224199518Sbms { "SCX0007" }, 225199518Sbms { /* sentinel */ } 226199518Sbms}; 227199518SbmsMODULE_DEVICE_TABLE(acpi, mb86s70_gpio_acpi_ids); 228199518Sbms#endif 229199518Sbms 230199518Sbmsstatic struct platform_driver mb86s70_gpio_driver = { 231199518Sbms .driver = { 232199518Sbms .name = "mb86s70-gpio", 233199518Sbms .of_match_table = mb86s70_gpio_dt_ids, 234199518Sbms .acpi_match_table = ACPI_PTR(mb86s70_gpio_acpi_ids), 235191672Sbms }, 236191672Sbms .probe = mb86s70_gpio_probe, 237199518Sbms .remove_new = mb86s70_gpio_remove, 238199518Sbms}; 239199518Sbmsmodule_platform_driver(mb86s70_gpio_driver); 240191672Sbms 241199518SbmsMODULE_DESCRIPTION("MB86S7x GPIO Driver"); 242199518SbmsMODULE_ALIAS("platform:mb86s70-gpio"); 243199518SbmsMODULE_LICENSE("GPL"); 244199518Sbms