150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
/*
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* QUICC Engine GPIOs
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*
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* Copyright (c) MontaVista Software, Inc. 2008.
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*
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/gpio.h>
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#include <asm/qe.h>
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struct qe_gpio_chip {
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struct of_mm_gpio_chip mm_gc;
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spinlock_t lock;
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/* shadowed data register to clear/set bits safely */
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u32 cpdata;
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};
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static inline struct qe_gpio_chip *
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to_qe_gpio_chip(struct of_mm_gpio_chip *mm_gc)
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{
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return container_of(mm_gc, struct qe_gpio_chip, mm_gc);
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}
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static void qe_gpio_save_regs(struct of_mm_gpio_chip *mm_gc)
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{
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struct qe_gpio_chip *qe_gc = to_qe_gpio_chip(mm_gc);
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struct qe_pio_regs __iomem *regs = mm_gc->regs;
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qe_gc->cpdata = in_be32(®s->cpdata);
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}
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static int qe_gpio_get(struct gpio_chip *gc, unsigned int gpio)
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{
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
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struct qe_pio_regs __iomem *regs = mm_gc->regs;
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u32 pin_mask = 1 << (QE_PIO_PINS - 1 - gpio);
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return in_be32(®s->cpdata) & pin_mask;
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}
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static void qe_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
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{
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
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struct qe_gpio_chip *qe_gc = to_qe_gpio_chip(mm_gc);
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struct qe_pio_regs __iomem *regs = mm_gc->regs;
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unsigned long flags;
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u32 pin_mask = 1 << (QE_PIO_PINS - 1 - gpio);
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spin_lock_irqsave(&qe_gc->lock, flags);
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if (val)
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qe_gc->cpdata |= pin_mask;
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else
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qe_gc->cpdata &= ~pin_mask;
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out_be32(®s->cpdata, qe_gc->cpdata);
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spin_unlock_irqrestore(&qe_gc->lock, flags);
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}
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static int qe_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
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{
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
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struct qe_gpio_chip *qe_gc = to_qe_gpio_chip(mm_gc);
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unsigned long flags;
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spin_lock_irqsave(&qe_gc->lock, flags);
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__par_io_config_pin(mm_gc->regs, gpio, QE_PIO_DIR_IN, 0, 0, 0);
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spin_unlock_irqrestore(&qe_gc->lock, flags);
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return 0;
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}
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static int qe_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
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{
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
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struct qe_gpio_chip *qe_gc = to_qe_gpio_chip(mm_gc);
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unsigned long flags;
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spin_lock_irqsave(&qe_gc->lock, flags);
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__par_io_config_pin(mm_gc->regs, gpio, QE_PIO_DIR_OUT, 0, 0, 0);
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spin_unlock_irqrestore(&qe_gc->lock, flags);
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qe_gpio_set(gc, gpio, val);
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return 0;
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}
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static int __init qe_add_gpiochips(void)
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{
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struct device_node *np;
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for_each_compatible_node(np, NULL, "fsl,mpc8323-qe-pario-bank") {
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int ret;
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struct qe_gpio_chip *qe_gc;
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struct of_mm_gpio_chip *mm_gc;
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struct of_gpio_chip *of_gc;
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struct gpio_chip *gc;
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qe_gc = kzalloc(sizeof(*qe_gc), GFP_KERNEL);
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if (!qe_gc) {
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ret = -ENOMEM;
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goto err;
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}
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spin_lock_init(&qe_gc->lock);
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mm_gc = &qe_gc->mm_gc;
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of_gc = &mm_gc->of_gc;
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gc = &of_gc->gc;
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mm_gc->save_regs = qe_gpio_save_regs;
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of_gc->gpio_cells = 2;
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gc->ngpio = QE_PIO_PINS;
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gc->direction_input = qe_gpio_dir_in;
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gc->direction_output = qe_gpio_dir_out;
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gc->get = qe_gpio_get;
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gc->set = qe_gpio_set;
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ret = of_mm_gpiochip_add(np, mm_gc);
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if (ret)
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goto err;
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continue;
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err:
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pr_err("%s: registration failed with status %d\n",
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np->full_name, ret);
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kfree(qe_gc);
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/* try others anyway */
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}
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return 0;
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}
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arch_initcall(qe_add_gpiochips);
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