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Linux/arch/sh/boards/mach-x3proto/gpio.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * arch/sh/boards/mach-x3proto/gpio.c
  4  *
  5  * Renesas SH-X3 Prototype Baseboard GPIO Support.
  6  *
  7  * Copyright (C) 2010 - 2012  Paul Mundt
  8  */
  9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 10 
 11 #include <linux/init.h>
 12 #include <linux/interrupt.h>
 13 #include <linux/gpio/driver.h>
 14 #include <linux/irq.h>
 15 #include <linux/kernel.h>
 16 #include <linux/spinlock.h>
 17 #include <linux/irqdomain.h>
 18 #include <linux/io.h>
 19 #include <mach/ilsel.h>
 20 #include <mach/hardware.h>
 21 
 22 #define KEYCTLR 0xb81c0000
 23 #define KEYOUTR 0xb81c0002
 24 #define KEYDETR 0xb81c0004
 25 
 26 static DEFINE_SPINLOCK(x3proto_gpio_lock);
 27 static struct irq_domain *x3proto_irq_domain;
 28 
 29 static int x3proto_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
 30 {
 31         unsigned long flags;
 32         unsigned int data;
 33 
 34         spin_lock_irqsave(&x3proto_gpio_lock, flags);
 35         data = __raw_readw(KEYCTLR);
 36         data |= (1 << gpio);
 37         __raw_writew(data, KEYCTLR);
 38         spin_unlock_irqrestore(&x3proto_gpio_lock, flags);
 39 
 40         return 0;
 41 }
 42 
 43 static int x3proto_gpio_get(struct gpio_chip *chip, unsigned gpio)
 44 {
 45         return !!(__raw_readw(KEYDETR) & (1 << gpio));
 46 }
 47 
 48 static int x3proto_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
 49 {
 50         int virq;
 51 
 52         if (gpio < chip->ngpio)
 53                 virq = irq_create_mapping(x3proto_irq_domain, gpio);
 54         else
 55                 virq = -ENXIO;
 56 
 57         return virq;
 58 }
 59 
 60 static void x3proto_gpio_irq_handler(struct irq_desc *desc)
 61 {
 62         struct irq_data *data = irq_desc_get_irq_data(desc);
 63         struct irq_chip *chip = irq_data_get_irq_chip(data);
 64         unsigned long mask;
 65         int pin;
 66 
 67         chip->irq_mask_ack(data);
 68 
 69         mask = __raw_readw(KEYDETR);
 70         for_each_set_bit(pin, &mask, NR_BASEBOARD_GPIOS)
 71                 generic_handle_irq(irq_linear_revmap(x3proto_irq_domain, pin));
 72 
 73         chip->irq_unmask(data);
 74 }
 75 
 76 struct gpio_chip x3proto_gpio_chip = {
 77         .label                  = "x3proto-gpio",
 78         .direction_input        = x3proto_gpio_direction_input,
 79         .get                    = x3proto_gpio_get,
 80         .to_irq                 = x3proto_gpio_to_irq,
 81         .base                   = -1,
 82         .ngpio                  = NR_BASEBOARD_GPIOS,
 83 };
 84 
 85 static int x3proto_gpio_irq_map(struct irq_domain *domain, unsigned int virq,
 86                                 irq_hw_number_t hwirq)
 87 {
 88         irq_set_chip_and_handler_name(virq, &dummy_irq_chip, handle_simple_irq,
 89                                       "gpio");
 90 
 91         return 0;
 92 }
 93 
 94 static struct irq_domain_ops x3proto_gpio_irq_ops = {
 95         .map    = x3proto_gpio_irq_map,
 96         .xlate  = irq_domain_xlate_twocell,
 97 };
 98 
 99 int __init x3proto_gpio_setup(void)
100 {
101         int ilsel, ret;
102 
103         ilsel = ilsel_enable(ILSEL_KEY);
104         if (unlikely(ilsel < 0))
105                 return ilsel;
106 
107         ret = gpiochip_add_data(&x3proto_gpio_chip, NULL);
108         if (unlikely(ret))
109                 goto err_gpio;
110 
111         x3proto_irq_domain = irq_domain_add_linear(NULL, NR_BASEBOARD_GPIOS,
112                                                    &x3proto_gpio_irq_ops, NULL);
113         if (unlikely(!x3proto_irq_domain))
114                 goto err_irq;
115 
116         pr_info("registering '%s' support, handling GPIOs %u -> %u, "
117                 "bound to IRQ %u\n",
118                 x3proto_gpio_chip.label, x3proto_gpio_chip.base,
119                 x3proto_gpio_chip.base + x3proto_gpio_chip.ngpio,
120                 ilsel);
121 
122         irq_set_chained_handler(ilsel, x3proto_gpio_irq_handler);
123         irq_set_irq_wake(ilsel, 1);
124 
125         return 0;
126 
127 err_irq:
128         gpiochip_remove(&x3proto_gpio_chip);
129         ret = 0;
130 err_gpio:
131         synchronize_irq(ilsel);
132 
133         ilsel_disable(ILSEL_KEY);
134 
135         return ret;
136 }
137 

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