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86222f6140
With the addition of GPIO_ACTIVE_LOW parsing in gpio-uclass, the omap gpio driver doesn't need a custom xlate routine. Signed-off-by: Eric Nelson <eric@nelint.com> Acked-by: Simon Glass <sjg@chromium.org>
347 lines
6.8 KiB
C
347 lines
6.8 KiB
C
/*
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* Copyright (c) 2009 Wind River Systems, Inc.
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* Tom Rix <Tom.Rix@windriver.com>
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*
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* SPDX-License-Identifier: GPL-2.0
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*
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* This work is derived from the linux 2.6.27 kernel source
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* To fetch, use the kernel repository
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* git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
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* Use the v2.6.27 tag.
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*
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* Below is the original's header including its copyright
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*
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* linux/arch/arm/plat-omap/gpio.c
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*
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* Support functions for OMAP GPIO
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*
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* Copyright (C) 2003-2005 Nokia Corporation
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* Written by Juha Yrjölä <juha.yrjola@nokia.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <asm/errno.h>
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#include <malloc.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define OMAP_GPIO_DIR_OUT 0
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#define OMAP_GPIO_DIR_IN 1
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#ifdef CONFIG_DM_GPIO
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#define GPIO_PER_BANK 32
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struct gpio_bank {
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/* TODO(sjg@chromium.org): Can we use a struct here? */
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void *base; /* address of registers in physical memory */
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};
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#endif
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static inline int get_gpio_index(int gpio)
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{
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return gpio & 0x1f;
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}
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int gpio_is_valid(int gpio)
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{
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return (gpio >= 0) && (gpio < OMAP_MAX_GPIO);
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}
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static void _set_gpio_direction(const struct gpio_bank *bank, int gpio,
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int is_input)
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{
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void *reg = bank->base;
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u32 l;
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reg += OMAP_GPIO_OE;
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l = __raw_readl(reg);
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if (is_input)
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l |= 1 << gpio;
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else
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l &= ~(1 << gpio);
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__raw_writel(l, reg);
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}
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/**
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* Get the direction of the GPIO by reading the GPIO_OE register
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* corresponding to the specified bank.
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*/
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static int _get_gpio_direction(const struct gpio_bank *bank, int gpio)
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{
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void *reg = bank->base;
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u32 v;
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reg += OMAP_GPIO_OE;
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v = __raw_readl(reg);
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if (v & (1 << gpio))
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return OMAP_GPIO_DIR_IN;
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else
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return OMAP_GPIO_DIR_OUT;
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}
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static void _set_gpio_dataout(const struct gpio_bank *bank, int gpio,
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int enable)
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{
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void *reg = bank->base;
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u32 l = 0;
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if (enable)
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reg += OMAP_GPIO_SETDATAOUT;
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else
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reg += OMAP_GPIO_CLEARDATAOUT;
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l = 1 << gpio;
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__raw_writel(l, reg);
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}
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static int _get_gpio_value(const struct gpio_bank *bank, int gpio)
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{
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void *reg = bank->base;
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int input;
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input = _get_gpio_direction(bank, gpio);
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switch (input) {
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case OMAP_GPIO_DIR_IN:
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reg += OMAP_GPIO_DATAIN;
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break;
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case OMAP_GPIO_DIR_OUT:
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reg += OMAP_GPIO_DATAOUT;
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break;
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default:
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return -1;
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}
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return (__raw_readl(reg) & (1 << gpio)) != 0;
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}
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#ifndef CONFIG_DM_GPIO
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static inline const struct gpio_bank *get_gpio_bank(int gpio)
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{
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return &omap_gpio_bank[gpio >> 5];
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}
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static int check_gpio(int gpio)
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{
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if (!gpio_is_valid(gpio)) {
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printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
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return -1;
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}
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return 0;
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}
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/**
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* Set value of the specified gpio
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*/
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int gpio_set_value(unsigned gpio, int value)
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{
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const struct gpio_bank *bank;
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if (check_gpio(gpio) < 0)
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return -1;
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bank = get_gpio_bank(gpio);
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_set_gpio_dataout(bank, get_gpio_index(gpio), value);
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return 0;
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}
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/**
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* Get value of the specified gpio
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*/
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int gpio_get_value(unsigned gpio)
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{
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const struct gpio_bank *bank;
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if (check_gpio(gpio) < 0)
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return -1;
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bank = get_gpio_bank(gpio);
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return _get_gpio_value(bank, get_gpio_index(gpio));
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}
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/**
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* Set gpio direction as input
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*/
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int gpio_direction_input(unsigned gpio)
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{
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const struct gpio_bank *bank;
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if (check_gpio(gpio) < 0)
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return -1;
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bank = get_gpio_bank(gpio);
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_set_gpio_direction(bank, get_gpio_index(gpio), 1);
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return 0;
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}
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/**
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* Set gpio direction as output
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*/
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int gpio_direction_output(unsigned gpio, int value)
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{
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const struct gpio_bank *bank;
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if (check_gpio(gpio) < 0)
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return -1;
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bank = get_gpio_bank(gpio);
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_set_gpio_dataout(bank, get_gpio_index(gpio), value);
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_set_gpio_direction(bank, get_gpio_index(gpio), 0);
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return 0;
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}
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/**
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* Request a gpio before using it.
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*
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* NOTE: Argument 'label' is unused.
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*/
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int gpio_request(unsigned gpio, const char *label)
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{
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if (check_gpio(gpio) < 0)
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return -1;
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return 0;
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}
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/**
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* Reset and free the gpio after using it.
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*/
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int gpio_free(unsigned gpio)
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{
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return 0;
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}
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#else /* new driver model interface CONFIG_DM_GPIO */
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/* set GPIO pin 'gpio' as an input */
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static int omap_gpio_direction_input(struct udevice *dev, unsigned offset)
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{
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struct gpio_bank *bank = dev_get_priv(dev);
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/* Configure GPIO direction as input. */
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_set_gpio_direction(bank, offset, 1);
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return 0;
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}
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/* set GPIO pin 'gpio' as an output, with polarity 'value' */
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static int omap_gpio_direction_output(struct udevice *dev, unsigned offset,
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int value)
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{
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struct gpio_bank *bank = dev_get_priv(dev);
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_set_gpio_dataout(bank, offset, value);
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_set_gpio_direction(bank, offset, 0);
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return 0;
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}
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/* read GPIO IN value of pin 'gpio' */
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static int omap_gpio_get_value(struct udevice *dev, unsigned offset)
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{
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struct gpio_bank *bank = dev_get_priv(dev);
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return _get_gpio_value(bank, offset);
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}
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/* write GPIO OUT value to pin 'gpio' */
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static int omap_gpio_set_value(struct udevice *dev, unsigned offset,
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int value)
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{
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struct gpio_bank *bank = dev_get_priv(dev);
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_set_gpio_dataout(bank, offset, value);
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return 0;
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}
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static int omap_gpio_get_function(struct udevice *dev, unsigned offset)
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{
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struct gpio_bank *bank = dev_get_priv(dev);
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/* GPIOF_FUNC is not implemented yet */
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if (_get_gpio_direction(bank, offset) == OMAP_GPIO_DIR_OUT)
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return GPIOF_OUTPUT;
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else
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return GPIOF_INPUT;
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}
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static const struct dm_gpio_ops gpio_omap_ops = {
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.direction_input = omap_gpio_direction_input,
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.direction_output = omap_gpio_direction_output,
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.get_value = omap_gpio_get_value,
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.set_value = omap_gpio_set_value,
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.get_function = omap_gpio_get_function,
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};
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static int omap_gpio_probe(struct udevice *dev)
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{
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struct gpio_bank *bank = dev_get_priv(dev);
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struct omap_gpio_platdata *plat = dev_get_platdata(dev);
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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uc_priv->bank_name = plat->port_name;
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uc_priv->gpio_count = GPIO_PER_BANK;
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bank->base = (void *)plat->base;
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return 0;
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}
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static int omap_gpio_bind(struct udevice *dev)
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{
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struct omap_gpio_platdata *plat = dev->platdata;
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fdt_addr_t base_addr;
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if (plat)
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return 0;
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base_addr = dev_get_addr(dev);
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if (base_addr == FDT_ADDR_T_NONE)
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return -ENODEV;
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/*
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* TODO:
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* When every board is converted to driver model and DT is
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* supported, this can be done by auto-alloc feature, but
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* not using calloc to alloc memory for platdata.
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*/
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plat = calloc(1, sizeof(*plat));
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if (!plat)
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return -ENOMEM;
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plat->base = base_addr;
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plat->port_name = fdt_get_name(gd->fdt_blob, dev->of_offset, NULL);
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dev->platdata = plat;
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return 0;
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}
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static const struct udevice_id omap_gpio_ids[] = {
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{ .compatible = "ti,omap3-gpio" },
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{ .compatible = "ti,omap4-gpio" },
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{ .compatible = "ti,am4372-gpio" },
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{ }
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};
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U_BOOT_DRIVER(gpio_omap) = {
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.name = "gpio_omap",
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.id = UCLASS_GPIO,
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.ops = &gpio_omap_ops,
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.of_match = omap_gpio_ids,
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.bind = omap_gpio_bind,
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.probe = omap_gpio_probe,
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.priv_auto_alloc_size = sizeof(struct gpio_bank),
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};
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#endif /* CONFIG_DM_GPIO */
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