mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-28 23:51:33 +00:00
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>
347 lines
7.4 KiB
C
347 lines
7.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2013 Xilinx, Michal Simek
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*/
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#include <common.h>
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#include <errno.h>
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#include <malloc.h>
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#include <linux/list.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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static LIST_HEAD(gpio_list);
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enum gpio_direction {
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GPIO_DIRECTION_OUT = 0,
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GPIO_DIRECTION_IN = 1,
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};
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/* Gpio simple map */
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struct gpio_regs {
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u32 gpiodata;
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u32 gpiodir;
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};
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#define GPIO_NAME_SIZE 10
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struct gpio_names {
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char name[GPIO_NAME_SIZE];
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};
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/* Initialized, rxbd_current, rx_first_buf must be 0 after init */
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struct xilinx_gpio_priv {
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struct gpio_regs *regs;
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u32 gpio_min;
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u32 gpio_max;
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u32 gpiodata_store;
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char name[GPIO_NAME_SIZE];
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struct list_head list;
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struct gpio_names *gpio_name;
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};
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/* Store number of allocated gpio pins */
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static u32 xilinx_gpio_max;
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/* Get associated gpio controller */
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static struct xilinx_gpio_priv *gpio_get_controller(unsigned gpio)
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{
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struct list_head *entry;
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struct xilinx_gpio_priv *priv = NULL;
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list_for_each(entry, &gpio_list) {
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priv = list_entry(entry, struct xilinx_gpio_priv, list);
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if (gpio >= priv->gpio_min && gpio <= priv->gpio_max) {
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debug("%s: reg: %x, min-max: %d-%d\n", __func__,
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(u32)priv->regs, priv->gpio_min, priv->gpio_max);
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return priv;
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}
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}
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puts("!!!Can't get gpio controller!!!\n");
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return NULL;
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}
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/* Get gpio pin name if used/setup */
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static char *get_name(unsigned gpio)
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{
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u32 gpio_priv;
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struct xilinx_gpio_priv *priv;
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debug("%s\n", __func__);
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priv = gpio_get_controller(gpio);
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if (priv) {
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gpio_priv = gpio - priv->gpio_min;
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return *priv->gpio_name[gpio_priv].name ?
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priv->gpio_name[gpio_priv].name : "UNKNOWN";
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}
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return "UNKNOWN";
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}
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/* Get output value */
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static int gpio_get_output_value(unsigned gpio)
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{
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u32 val, gpio_priv;
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struct xilinx_gpio_priv *priv = gpio_get_controller(gpio);
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if (priv) {
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gpio_priv = gpio - priv->gpio_min;
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val = !!(priv->gpiodata_store & (1 << gpio_priv));
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debug("%s: reg: %x, gpio_no: %d, dir: %d\n", __func__,
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(u32)priv->regs, gpio_priv, val);
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return val;
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}
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return -1;
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}
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/* Get input value */
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static int gpio_get_input_value(unsigned gpio)
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{
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u32 val, gpio_priv;
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struct gpio_regs *regs;
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struct xilinx_gpio_priv *priv = gpio_get_controller(gpio);
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if (priv) {
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regs = priv->regs;
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gpio_priv = gpio - priv->gpio_min;
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val = readl(®s->gpiodata);
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val = !!(val & (1 << gpio_priv));
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debug("%s: reg: %x, gpio_no: %d, dir: %d\n", __func__,
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(u32)priv->regs, gpio_priv, val);
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return val;
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}
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return -1;
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}
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/* Set gpio direction */
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static int gpio_set_direction(unsigned gpio, enum gpio_direction direction)
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{
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u32 val, gpio_priv;
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struct gpio_regs *regs;
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struct xilinx_gpio_priv *priv = gpio_get_controller(gpio);
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if (priv) {
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regs = priv->regs;
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val = readl(®s->gpiodir);
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gpio_priv = gpio - priv->gpio_min;
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if (direction == GPIO_DIRECTION_OUT)
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val &= ~(1 << gpio_priv);
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else
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val |= 1 << gpio_priv;
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writel(val, ®s->gpiodir);
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debug("%s: reg: %x, gpio_no: %d, dir: %d\n", __func__,
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(u32)priv->regs, gpio_priv, val);
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return 0;
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}
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return -1;
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}
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/* Get gpio direction */
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static int gpio_get_direction(unsigned gpio)
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{
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u32 val, gpio_priv;
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struct gpio_regs *regs;
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struct xilinx_gpio_priv *priv = gpio_get_controller(gpio);
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if (priv) {
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regs = priv->regs;
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gpio_priv = gpio - priv->gpio_min;
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val = readl(®s->gpiodir);
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val = !!(val & (1 << gpio_priv));
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debug("%s: reg: %x, gpio_no: %d, dir: %d\n", __func__,
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(u32)priv->regs, gpio_priv, val);
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return val;
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}
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return -1;
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}
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/*
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* Get input value
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* for example gpio setup to output only can't get input value
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* which is breaking gpio toggle command
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*/
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int gpio_get_value(unsigned gpio)
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{
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u32 val;
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if (gpio_get_direction(gpio) == GPIO_DIRECTION_OUT)
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val = gpio_get_output_value(gpio);
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else
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val = gpio_get_input_value(gpio);
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return val;
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}
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/* Set output value */
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static int gpio_set_output_value(unsigned gpio, int value)
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{
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u32 val, gpio_priv;
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struct gpio_regs *regs;
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struct xilinx_gpio_priv *priv = gpio_get_controller(gpio);
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if (priv) {
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regs = priv->regs;
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gpio_priv = gpio - priv->gpio_min;
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val = priv->gpiodata_store;
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if (value)
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val |= 1 << gpio_priv;
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else
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val &= ~(1 << gpio_priv);
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writel(val, ®s->gpiodata);
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debug("%s: reg: %x, gpio_no: %d, output_val: %d\n", __func__,
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(u32)priv->regs, gpio_priv, val);
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priv->gpiodata_store = val;
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return 0;
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}
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return -1;
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}
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int gpio_set_value(unsigned gpio, int value)
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{
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if (gpio_get_direction(gpio) == GPIO_DIRECTION_OUT)
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return gpio_set_output_value(gpio, value);
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return -1;
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}
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/* Set GPIO as input */
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int gpio_direction_input(unsigned gpio)
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{
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debug("%s\n", __func__);
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return gpio_set_direction(gpio, GPIO_DIRECTION_IN);
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}
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/* Setup GPIO as output and set output value */
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int gpio_direction_output(unsigned gpio, int value)
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{
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int ret = gpio_set_direction(gpio, GPIO_DIRECTION_OUT);
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debug("%s\n", __func__);
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if (ret < 0)
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return ret;
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return gpio_set_output_value(gpio, value);
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}
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/* Show gpio status */
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void gpio_info(void)
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{
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unsigned gpio;
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struct list_head *entry;
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struct xilinx_gpio_priv *priv = NULL;
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list_for_each(entry, &gpio_list) {
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priv = list_entry(entry, struct xilinx_gpio_priv, list);
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printf("\n%s: %s/%x (%d-%d)\n", __func__, priv->name,
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(u32)priv->regs, priv->gpio_min, priv->gpio_max);
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for (gpio = priv->gpio_min; gpio <= priv->gpio_max; gpio++) {
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printf("GPIO_%d:\t%s is an ", gpio, get_name(gpio));
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if (gpio_get_direction(gpio) == GPIO_DIRECTION_OUT)
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printf("OUTPUT value = %d\n",
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gpio_get_output_value(gpio));
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else
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printf("INPUT value = %d\n",
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gpio_get_input_value(gpio));
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}
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}
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}
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int gpio_request(unsigned gpio, const char *label)
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{
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u32 gpio_priv;
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struct xilinx_gpio_priv *priv;
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if (gpio >= xilinx_gpio_max)
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return -EINVAL;
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priv = gpio_get_controller(gpio);
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if (priv) {
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gpio_priv = gpio - priv->gpio_min;
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if (label != NULL) {
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strncpy(priv->gpio_name[gpio_priv].name, label,
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GPIO_NAME_SIZE);
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priv->gpio_name[gpio_priv].name[GPIO_NAME_SIZE - 1] =
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'\0';
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}
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return 0;
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}
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return -1;
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}
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int gpio_free(unsigned gpio)
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{
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u32 gpio_priv;
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struct xilinx_gpio_priv *priv;
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if (gpio >= xilinx_gpio_max)
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return -EINVAL;
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priv = gpio_get_controller(gpio);
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if (priv) {
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gpio_priv = gpio - priv->gpio_min;
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priv->gpio_name[gpio_priv].name[0] = '\0';
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/* Do nothing here */
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return 0;
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}
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return -1;
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}
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int gpio_alloc(u32 baseaddr, const char *name, u32 gpio_no)
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{
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struct xilinx_gpio_priv *priv;
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priv = calloc(1, sizeof(struct xilinx_gpio_priv));
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/* Setup gpio name */
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if (name != NULL) {
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strncpy(priv->name, name, GPIO_NAME_SIZE);
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priv->name[GPIO_NAME_SIZE - 1] = '\0';
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}
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priv->regs = (struct gpio_regs *)baseaddr;
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priv->gpio_min = xilinx_gpio_max;
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xilinx_gpio_max = priv->gpio_min + gpio_no;
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priv->gpio_max = xilinx_gpio_max - 1;
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priv->gpio_name = calloc(gpio_no, sizeof(struct gpio_names));
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INIT_LIST_HEAD(&priv->list);
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list_add_tail(&priv->list, &gpio_list);
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printf("%s: Add %s (%d-%d)\n", __func__, name,
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priv->gpio_min, priv->gpio_max);
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/* Return the first gpio allocated for this device */
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return priv->gpio_min;
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}
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/* Dual channel gpio is one IP with two independent channels */
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int gpio_alloc_dual(u32 baseaddr, const char *name, u32 gpio_no0, u32 gpio_no1)
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{
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int ret;
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ret = gpio_alloc(baseaddr, name, gpio_no0);
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gpio_alloc(baseaddr + 8, strcat((char *)name, "_1"), gpio_no1);
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/* Return the first gpio allocated for this device */
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return ret;
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}
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