2012-06-20 08:29:04 +00:00
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/*
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* SuperH Pin Function Controller GPIO driver.
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*
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* Copyright (C) 2008 Magnus Damm
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* Copyright (C) 2009 - 2012 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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2012-12-15 22:50:47 +00:00
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#define pr_fmt(fmt) KBUILD_MODNAME " gpio: " fmt
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2012-06-20 08:29:04 +00:00
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2012-12-15 22:50:48 +00:00
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#include <linux/device.h>
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2012-06-20 08:29:04 +00:00
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#include <linux/gpio.h>
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2012-12-15 22:50:52 +00:00
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#include <linux/init.h>
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2012-06-20 08:29:04 +00:00
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#include <linux/module.h>
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2012-07-10 03:08:14 +00:00
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#include <linux/pinctrl/consumer.h>
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2012-12-15 22:50:52 +00:00
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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2012-06-20 08:29:04 +00:00
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2012-12-15 22:50:44 +00:00
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#include "core.h"
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2012-06-20 08:29:04 +00:00
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struct sh_pfc_chip {
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struct sh_pfc *pfc;
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struct gpio_chip gpio_chip;
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};
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static struct sh_pfc_chip *gpio_to_pfc_chip(struct gpio_chip *gc)
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{
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return container_of(gc, struct sh_pfc_chip, gpio_chip);
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}
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static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc)
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{
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return gpio_to_pfc_chip(gc)->pfc;
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}
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2012-12-06 13:49:25 +00:00
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/* -----------------------------------------------------------------------------
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* Pin GPIOs
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*/
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2012-06-20 08:29:04 +00:00
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2012-12-06 13:49:25 +00:00
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static int gpio_pin_request(struct gpio_chip *gc, unsigned offset)
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2012-06-20 08:29:04 +00:00
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{
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2013-02-14 21:12:11 +00:00
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struct sh_pfc *pfc = gpio_to_pfc(gc);
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2013-02-14 21:35:09 +00:00
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struct sh_pfc_pin *pin = sh_pfc_get_pin(pfc, offset);
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2013-02-14 21:12:11 +00:00
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2013-02-15 00:33:38 +00:00
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if (pin == NULL || pin->enum_id == 0)
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2013-02-14 21:12:11 +00:00
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return -EINVAL;
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2012-12-06 13:49:25 +00:00
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return pinctrl_request_gpio(offset);
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2012-06-20 08:29:04 +00:00
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}
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2012-12-06 13:49:25 +00:00
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static void gpio_pin_free(struct gpio_chip *gc, unsigned offset)
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2012-06-20 08:29:04 +00:00
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{
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2012-12-06 13:49:25 +00:00
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return pinctrl_free_gpio(offset);
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2012-06-20 08:29:04 +00:00
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}
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2012-12-06 13:49:25 +00:00
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static void gpio_pin_set_value(struct sh_pfc *pfc, unsigned offset, int value)
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2012-06-20 08:29:04 +00:00
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{
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2013-02-14 21:12:11 +00:00
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struct pinmux_data_reg *dr;
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int bit;
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2012-06-20 08:29:04 +00:00
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2013-02-14 21:12:11 +00:00
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sh_pfc_get_data_reg(pfc, offset, &dr, &bit);
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2012-12-06 13:49:25 +00:00
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sh_pfc_write_bit(dr, bit, value);
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2012-06-20 08:29:04 +00:00
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}
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2012-12-06 13:49:25 +00:00
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static int gpio_pin_direction_input(struct gpio_chip *gc, unsigned offset)
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2012-07-10 03:08:14 +00:00
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{
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return pinctrl_gpio_direction_input(offset);
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}
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2012-12-06 13:49:25 +00:00
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static int gpio_pin_direction_output(struct gpio_chip *gc, unsigned offset,
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2012-07-10 03:08:14 +00:00
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int value)
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{
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2012-12-06 13:49:25 +00:00
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gpio_pin_set_value(gpio_to_pfc(gc), offset, value);
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2012-07-10 03:08:14 +00:00
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return pinctrl_gpio_direction_output(offset);
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}
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2012-12-06 13:49:25 +00:00
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static int gpio_pin_get(struct gpio_chip *gc, unsigned offset)
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2012-06-20 08:29:04 +00:00
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{
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2012-12-06 13:49:25 +00:00
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struct sh_pfc *pfc = gpio_to_pfc(gc);
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2013-02-14 21:12:11 +00:00
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struct pinmux_data_reg *dr;
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int bit;
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2012-12-06 13:49:25 +00:00
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2013-02-14 21:12:11 +00:00
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sh_pfc_get_data_reg(pfc, offset, &dr, &bit);
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2012-12-06 13:49:25 +00:00
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return sh_pfc_read_bit(dr, bit);
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2012-06-20 08:29:04 +00:00
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}
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2012-12-06 13:49:25 +00:00
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static void gpio_pin_set(struct gpio_chip *gc, unsigned offset, int value)
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2012-06-20 08:29:04 +00:00
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{
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2012-12-06 13:49:25 +00:00
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gpio_pin_set_value(gpio_to_pfc(gc), offset, value);
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2012-06-20 08:29:04 +00:00
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}
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2012-12-06 13:49:25 +00:00
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static int gpio_pin_to_irq(struct gpio_chip *gc, unsigned offset)
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2012-06-20 08:29:04 +00:00
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{
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struct sh_pfc *pfc = gpio_to_pfc(gc);
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2013-01-03 13:12:14 +00:00
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int i, k;
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for (i = 0; i < pfc->info->gpio_irq_size; i++) {
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unsigned short *gpios = pfc->info->gpio_irq[i].gpios;
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for (k = 0; gpios[k]; k++) {
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if (gpios[k] == offset)
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return pfc->info->gpio_irq[i].irq;
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2012-06-20 08:29:04 +00:00
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}
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}
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return -ENOSYS;
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}
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2012-12-06 13:49:25 +00:00
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static void gpio_pin_setup(struct sh_pfc_chip *chip)
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2012-06-20 08:29:04 +00:00
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{
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struct sh_pfc *pfc = chip->pfc;
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struct gpio_chip *gc = &chip->gpio_chip;
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2012-12-06 13:49:25 +00:00
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gc->request = gpio_pin_request;
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gc->free = gpio_pin_free;
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gc->direction_input = gpio_pin_direction_input;
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gc->get = gpio_pin_get;
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gc->direction_output = gpio_pin_direction_output;
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gc->set = gpio_pin_set;
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gc->to_irq = gpio_pin_to_irq;
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2012-06-20 08:29:04 +00:00
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2012-12-15 22:51:20 +00:00
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gc->label = pfc->info->name;
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2012-12-06 13:49:25 +00:00
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gc->dev = pfc->dev;
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2012-06-20 08:29:04 +00:00
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gc->owner = THIS_MODULE;
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2012-11-28 16:51:00 +00:00
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gc->base = 0;
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2013-02-15 00:33:38 +00:00
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gc->ngpio = pfc->nr_pins;
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2012-06-20 08:29:04 +00:00
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}
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2012-12-06 13:49:25 +00:00
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/* -----------------------------------------------------------------------------
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* Function GPIOs
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*/
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static int gpio_function_request(struct gpio_chip *gc, unsigned offset)
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{
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struct sh_pfc *pfc = gpio_to_pfc(gc);
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2013-02-14 16:36:56 +00:00
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unsigned int mark = pfc->info->func_gpios[offset].enum_id;
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2012-12-06 13:49:25 +00:00
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unsigned long flags;
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int ret = -EINVAL;
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pr_notice_once("Use of GPIO API for function requests is deprecated, convert to pinctrl\n");
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2013-02-14 16:36:56 +00:00
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if (mark == 0)
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2012-12-06 13:49:25 +00:00
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return ret;
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spin_lock_irqsave(&pfc->lock, flags);
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2013-02-14 16:36:56 +00:00
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if (sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION, GPIO_CFG_DRYRUN))
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2012-12-06 13:49:25 +00:00
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goto done;
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2013-02-14 16:36:56 +00:00
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if (sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION, GPIO_CFG_REQ))
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2012-12-06 13:49:25 +00:00
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goto done;
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ret = 0;
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done:
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spin_unlock_irqrestore(&pfc->lock, flags);
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return ret;
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}
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static void gpio_function_free(struct gpio_chip *gc, unsigned offset)
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{
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struct sh_pfc *pfc = gpio_to_pfc(gc);
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2013-02-14 16:36:56 +00:00
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unsigned int mark = pfc->info->func_gpios[offset].enum_id;
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2012-12-06 13:49:25 +00:00
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unsigned long flags;
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spin_lock_irqsave(&pfc->lock, flags);
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2013-02-14 16:36:56 +00:00
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sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION, GPIO_CFG_FREE);
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2012-12-06 13:49:25 +00:00
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spin_unlock_irqrestore(&pfc->lock, flags);
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}
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static void gpio_function_setup(struct sh_pfc_chip *chip)
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{
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struct sh_pfc *pfc = chip->pfc;
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struct gpio_chip *gc = &chip->gpio_chip;
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gc->request = gpio_function_request;
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gc->free = gpio_function_free;
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gc->label = pfc->info->name;
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gc->owner = THIS_MODULE;
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2013-02-15 00:33:38 +00:00
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gc->base = pfc->nr_pins;
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2012-12-06 13:49:25 +00:00
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gc->ngpio = pfc->info->nr_func_gpios;
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}
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/* -----------------------------------------------------------------------------
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* Register/unregister
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*/
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static struct sh_pfc_chip *
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sh_pfc_add_gpiochip(struct sh_pfc *pfc, void(*setup)(struct sh_pfc_chip *))
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2012-06-20 08:29:04 +00:00
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{
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struct sh_pfc_chip *chip;
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int ret;
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2012-12-15 22:50:48 +00:00
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chip = devm_kzalloc(pfc->dev, sizeof(*chip), GFP_KERNEL);
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2012-06-20 08:29:04 +00:00
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if (unlikely(!chip))
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2012-12-06 13:49:25 +00:00
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return ERR_PTR(-ENOMEM);
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2012-06-20 08:29:04 +00:00
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chip->pfc = pfc;
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2012-12-06 13:49:25 +00:00
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setup(chip);
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2012-06-20 08:29:04 +00:00
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ret = gpiochip_add(&chip->gpio_chip);
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2012-12-15 22:50:48 +00:00
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if (unlikely(ret < 0))
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2012-12-06 13:49:25 +00:00
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return ERR_PTR(ret);
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pr_info("%s handling gpio %u -> %u\n",
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chip->gpio_chip.label, chip->gpio_chip.base,
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chip->gpio_chip.base + chip->gpio_chip.ngpio - 1);
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return chip;
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}
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int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
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{
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2013-02-15 00:33:38 +00:00
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const struct pinmux_range *ranges;
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struct pinmux_range def_range;
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2012-12-06 13:49:25 +00:00
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struct sh_pfc_chip *chip;
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2013-02-15 00:33:38 +00:00
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unsigned int nr_ranges;
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unsigned int i;
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2013-03-07 23:45:12 +00:00
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int ret;
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2012-12-06 13:49:25 +00:00
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2013-02-15 00:33:38 +00:00
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/* Register the real GPIOs chip. */
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2012-12-06 13:49:25 +00:00
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chip = sh_pfc_add_gpiochip(pfc, gpio_pin_setup);
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if (IS_ERR(chip))
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return PTR_ERR(chip);
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2012-12-15 22:50:46 +00:00
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pfc->gpio = chip;
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2012-06-20 08:29:04 +00:00
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2013-02-15 00:33:38 +00:00
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/* Register the GPIO to pin mappings. */
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if (pfc->info->ranges == NULL) {
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def_range.begin = 0;
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def_range.end = pfc->info->nr_pins - 1;
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ranges = &def_range;
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nr_ranges = 1;
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} else {
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ranges = pfc->info->ranges;
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nr_ranges = pfc->info->nr_ranges;
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}
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for (i = 0; i < nr_ranges; ++i) {
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const struct pinmux_range *range = &ranges[i];
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ret = gpiochip_add_pin_range(&chip->gpio_chip,
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dev_name(pfc->dev),
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range->begin, range->begin,
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range->end - range->begin + 1);
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if (ret < 0)
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return ret;
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}
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2013-03-07 23:45:12 +00:00
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2013-02-15 00:33:38 +00:00
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/* Register the function GPIOs chip. */
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2012-12-06 13:49:25 +00:00
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chip = sh_pfc_add_gpiochip(pfc, gpio_function_setup);
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if (IS_ERR(chip))
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return PTR_ERR(chip);
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pfc->func = chip;
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2012-06-20 08:29:04 +00:00
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return 0;
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}
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2012-12-15 22:50:46 +00:00
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int sh_pfc_unregister_gpiochip(struct sh_pfc *pfc)
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2012-06-20 08:29:04 +00:00
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{
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2012-12-06 13:49:25 +00:00
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int err;
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2012-06-20 08:29:04 +00:00
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int ret;
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2012-12-06 13:49:25 +00:00
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ret = gpiochip_remove(&pfc->gpio->gpio_chip);
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err = gpiochip_remove(&pfc->func->gpio_chip);
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2012-06-20 08:29:04 +00:00
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2012-12-06 13:49:25 +00:00
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return ret < 0 ? ret : err;
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2012-06-20 08:29:04 +00:00
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}
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