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https://github.com/AsahiLinux/u-boot
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abce2c6220
This patch enables CONFIG_CMD_GPIO for the Allwinner (sunxi) platform as well as providing the common gpio API (gpio_request/free, direction in/out, get/set etc). Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Ma Haijun <mahaijuns@gmail.com> Signed-off-by: Oliver Schinagl <oliver@schinagl.nl> Signed-off-by: Ian Campbell <ijc@hellion.org.uk> Cc: Henrik Nordström <henrik@henriknordstrom.net> Cc: Tom Cubie <Mr.hipboi@gmail.com> Acked-by: Hans de Goede <hdegoede@redhat.com>
102 lines
1.8 KiB
C
102 lines
1.8 KiB
C
/*
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* (C) Copyright 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
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*
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* Based on earlier arch/arm/cpu/armv7/sunxi/gpio.c:
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*
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* (C) Copyright 2007-2011
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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* Tom Cubie <tangliang@allwinnertech.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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static int sunxi_gpio_output(u32 pin, u32 val)
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{
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u32 dat;
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u32 bank = GPIO_BANK(pin);
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u32 num = GPIO_NUM(pin);
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struct sunxi_gpio *pio = BANK_TO_GPIO(bank);
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dat = readl(&pio->dat);
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if (val)
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dat |= 0x1 << num;
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else
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dat &= ~(0x1 << num);
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writel(dat, &pio->dat);
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return 0;
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}
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static int sunxi_gpio_input(u32 pin)
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{
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u32 dat;
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u32 bank = GPIO_BANK(pin);
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u32 num = GPIO_NUM(pin);
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struct sunxi_gpio *pio = BANK_TO_GPIO(bank);
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dat = readl(&pio->dat);
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dat >>= num;
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return dat & 0x1;
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}
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int gpio_request(unsigned gpio, const char *label)
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{
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return 0;
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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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int gpio_direction_input(unsigned gpio)
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{
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sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_INPUT);
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return sunxi_gpio_input(gpio);
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_OUTPUT);
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return sunxi_gpio_output(gpio, value);
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}
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int gpio_get_value(unsigned gpio)
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{
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return sunxi_gpio_input(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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return sunxi_gpio_output(gpio, value);
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}
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int sunxi_name_to_gpio(const char *name)
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{
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int group = 0;
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int groupsize = 9 * 32;
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long pin;
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char *eptr;
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if (*name == 'P' || *name == 'p')
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name++;
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if (*name >= 'A') {
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group = *name - (*name > 'a' ? 'a' : 'A');
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groupsize = 32;
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name++;
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}
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pin = simple_strtol(name, &eptr, 10);
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if (!*name || *eptr)
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return -1;
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if (pin < 0 || pin > groupsize || group >= 9)
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return -1;
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return group * 32 + pin;
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}
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