mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-23 03:19:43 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
351 lines
7.0 KiB
C
351 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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* 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 <linux/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_get_platdata(dev);
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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 = devfdt_get_addr(dev);
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if (base_addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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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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* For example am33xx_gpio uses platform data rather than device tree.
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*
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* NOTE: DO NOT COPY this code if you are using device tree.
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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(dev), 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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.flags = DM_FLAG_PRE_RELOC,
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};
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#endif /* CONFIG_DM_GPIO */
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