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https://github.com/brain-hackers/u-boot-brain
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![Hans de Goede](/assets/img/avatar_default.png)
Some boards use GPIO-s on the pmic, one example of this is the A13-OLinuXino board, which uses gpio0 of the axp209 for the lcd-power signal. This commit adds support for gpio pins on the AXP209 pmic, the sunxi_gpio.c changes are universal, adding gpio support for the other AXP pmics (when necessary) should be a matter of adding the necessary axp_gpio_foo functions to their resp. drivers, and add "#define AXP_GPIO" to their header file. Note this commit only adds support for the non device-model version of the gpio code, patches for adding support to the device-model version are very welcome. The string representation for these gpio-s is AXP0-#, the 0 in the AXP0 prefix is there in case we need to support gpio-s on more then 1 pmic in the future. At least A80 boards have 2 pmics, and we may end up needing to support gpio-s on both. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Ian Campbell <ijc@hellion.org.uk>
303 lines
6.3 KiB
C
303 lines
6.3 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 <dm.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <malloc.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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#include <dm/device-internal.h>
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#ifdef CONFIG_AXP209_POWER
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#include <axp209.h>
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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#define SUNXI_GPIOS_PER_BANK SUNXI_GPIO_A_NR
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struct sunxi_gpio_platdata {
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struct sunxi_gpio *regs;
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const char *bank_name; /* Name of bank, e.g. "B" */
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int gpio_count;
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};
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#ifndef CONFIG_DM_GPIO
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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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#ifdef AXP_GPIO
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if (gpio >= SUNXI_GPIO_AXP0_START)
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return axp_gpio_direction_input(gpio - SUNXI_GPIO_AXP0_START);
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#endif
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sunxi_gpio_set_cfgpin(gpio, SUNXI_GPIO_INPUT);
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return 0;
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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#ifdef AXP_GPIO
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if (gpio >= SUNXI_GPIO_AXP0_START)
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return axp_gpio_direction_output(gpio - SUNXI_GPIO_AXP0_START,
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value);
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#endif
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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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#ifdef AXP_GPIO
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if (gpio >= SUNXI_GPIO_AXP0_START)
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return axp_gpio_get_value(gpio - SUNXI_GPIO_AXP0_START);
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#endif
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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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#ifdef AXP_GPIO
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if (gpio >= SUNXI_GPIO_AXP0_START)
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return axp_gpio_set_value(gpio - SUNXI_GPIO_AXP0_START, value);
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#endif
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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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#ifdef AXP_GPIO
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if (strncasecmp(name, "AXP0-", 5) == 0) {
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name += 5;
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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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return SUNXI_GPIO_AXP0_START + pin;
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}
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#endif
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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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#endif
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#ifdef CONFIG_DM_GPIO
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static int sunxi_gpio_direction_input(struct udevice *dev, unsigned offset)
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{
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struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
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sunxi_gpio_set_cfgbank(plat->regs, offset, SUNXI_GPIO_INPUT);
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return 0;
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}
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static int sunxi_gpio_direction_output(struct udevice *dev, unsigned offset,
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int value)
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{
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struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
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u32 num = GPIO_NUM(offset);
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sunxi_gpio_set_cfgbank(plat->regs, offset, SUNXI_GPIO_OUTPUT);
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clrsetbits_le32(&plat->regs->dat, 1 << num, value ? (1 << num) : 0);
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return 0;
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}
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static int sunxi_gpio_get_value(struct udevice *dev, unsigned offset)
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{
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struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
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u32 num = GPIO_NUM(offset);
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unsigned dat;
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dat = readl(&plat->regs->dat);
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dat >>= num;
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return dat & 0x1;
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}
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static int sunxi_gpio_set_value(struct udevice *dev, unsigned offset,
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int value)
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{
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struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
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u32 num = GPIO_NUM(offset);
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clrsetbits_le32(&plat->regs->dat, 1 << num, value ? (1 << num) : 0);
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return 0;
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}
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static int sunxi_gpio_get_function(struct udevice *dev, unsigned offset)
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{
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struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
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int func;
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func = sunxi_gpio_get_cfgbank(plat->regs, offset);
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if (func == SUNXI_GPIO_OUTPUT)
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return GPIOF_OUTPUT;
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else if (func == SUNXI_GPIO_INPUT)
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return GPIOF_INPUT;
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else
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return GPIOF_FUNC;
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}
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static const struct dm_gpio_ops gpio_sunxi_ops = {
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.direction_input = sunxi_gpio_direction_input,
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.direction_output = sunxi_gpio_direction_output,
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.get_value = sunxi_gpio_get_value,
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.set_value = sunxi_gpio_set_value,
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.get_function = sunxi_gpio_get_function,
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};
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/**
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* Returns the name of a GPIO bank
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*
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* GPIO banks are named A, B, C, ...
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*
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* @bank: Bank number (0, 1..n-1)
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* @return allocated string containing the name
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*/
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static char *gpio_bank_name(int bank)
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{
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char *name;
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name = malloc(2);
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if (name) {
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name[0] = 'A' + bank;
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name[1] = '\0';
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}
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return name;
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}
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static int gpio_sunxi_probe(struct udevice *dev)
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{
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struct sunxi_gpio_platdata *plat = dev_get_platdata(dev);
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struct gpio_dev_priv *uc_priv = dev->uclass_priv;
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/* Tell the uclass how many GPIOs we have */
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if (plat) {
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uc_priv->gpio_count = plat->gpio_count;
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uc_priv->bank_name = plat->bank_name;
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}
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return 0;
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}
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/**
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* We have a top-level GPIO device with no actual GPIOs. It has a child
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* device for each Sunxi bank.
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*/
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static int gpio_sunxi_bind(struct udevice *parent)
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{
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struct sunxi_gpio_platdata *plat = parent->platdata;
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struct sunxi_gpio_reg *ctlr;
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int bank;
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int ret;
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/* If this is a child device, there is nothing to do here */
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if (plat)
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return 0;
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ctlr = (struct sunxi_gpio_reg *)fdtdec_get_addr(gd->fdt_blob,
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parent->of_offset, "reg");
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for (bank = 0; bank < SUNXI_GPIO_BANKS; bank++) {
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struct sunxi_gpio_platdata *plat;
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struct udevice *dev;
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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->regs = &ctlr->gpio_bank[bank];
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plat->bank_name = gpio_bank_name(bank);
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plat->gpio_count = SUNXI_GPIOS_PER_BANK;
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ret = device_bind(parent, parent->driver,
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plat->bank_name, plat, -1, &dev);
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if (ret)
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return ret;
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dev->of_offset = parent->of_offset;
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}
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return 0;
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}
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static const struct udevice_id sunxi_gpio_ids[] = {
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{ .compatible = "allwinner,sun7i-a20-pinctrl" },
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{ }
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};
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U_BOOT_DRIVER(gpio_sunxi) = {
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.name = "gpio_sunxi",
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.id = UCLASS_GPIO,
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.ops = &gpio_sunxi_ops,
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.of_match = sunxi_gpio_ids,
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.bind = gpio_sunxi_bind,
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.probe = gpio_sunxi_probe,
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};
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#endif
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