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https://github.com/AsahiLinux/u-boot
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26dd346464
* Add mxc_gpio support for imx7d SoC * Use CONFIG_MX7 to extend mxc gpio driver support for imx7d Signed-off-by: Peng Fan <Peng.Fan@freescale.com> Signed-off-by: Adrian Alonso <aalonso@freescale.com>
376 lines
8.1 KiB
C
376 lines
8.1 KiB
C
/*
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* Copyright (C) 2009
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* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
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*
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* Copyright (C) 2011
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* Stefano Babic, DENX Software Engineering, <sbabic@denx.de>
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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 <errno.h>
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#include <dm.h>
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#include <malloc.h>
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#include <asm/arch/imx-regs.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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enum mxc_gpio_direction {
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MXC_GPIO_DIRECTION_IN,
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MXC_GPIO_DIRECTION_OUT,
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};
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#define GPIO_PER_BANK 32
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struct mxc_gpio_plat {
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int bank_index;
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struct gpio_regs *regs;
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};
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struct mxc_bank_info {
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struct gpio_regs *regs;
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};
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#ifndef CONFIG_DM_GPIO
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#define GPIO_TO_PORT(n) (n / 32)
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/* GPIO port description */
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static unsigned long gpio_ports[] = {
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[0] = GPIO1_BASE_ADDR,
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[1] = GPIO2_BASE_ADDR,
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[2] = GPIO3_BASE_ADDR,
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#if defined(CONFIG_MX25) || defined(CONFIG_MX27) || defined(CONFIG_MX51) || \
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defined(CONFIG_MX53) || defined(CONFIG_MX6) || \
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defined(CONFIG_MX7)
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[3] = GPIO4_BASE_ADDR,
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#endif
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#if defined(CONFIG_MX27) || defined(CONFIG_MX53) || defined(CONFIG_MX6) || \
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defined(CONFIG_MX7)
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[4] = GPIO5_BASE_ADDR,
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#ifndef CONFIG_MX6UL
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[5] = GPIO6_BASE_ADDR,
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#endif
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#endif
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#if defined(CONFIG_MX53) || defined(CONFIG_MX6) || defined(CONFIG_MX7)
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#ifndef CONFIG_MX6UL
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[6] = GPIO7_BASE_ADDR,
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#endif
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#endif
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};
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static int mxc_gpio_direction(unsigned int gpio,
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enum mxc_gpio_direction direction)
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{
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unsigned int port = GPIO_TO_PORT(gpio);
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struct gpio_regs *regs;
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u32 l;
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if (port >= ARRAY_SIZE(gpio_ports))
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return -1;
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gpio &= 0x1f;
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regs = (struct gpio_regs *)gpio_ports[port];
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l = readl(®s->gpio_dir);
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switch (direction) {
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case MXC_GPIO_DIRECTION_OUT:
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l |= 1 << gpio;
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break;
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case MXC_GPIO_DIRECTION_IN:
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l &= ~(1 << gpio);
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}
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writel(l, ®s->gpio_dir);
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return 0;
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}
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int gpio_set_value(unsigned gpio, int value)
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{
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unsigned int port = GPIO_TO_PORT(gpio);
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struct gpio_regs *regs;
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u32 l;
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if (port >= ARRAY_SIZE(gpio_ports))
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return -1;
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gpio &= 0x1f;
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regs = (struct gpio_regs *)gpio_ports[port];
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l = readl(®s->gpio_dr);
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if (value)
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l |= 1 << gpio;
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else
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l &= ~(1 << gpio);
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writel(l, ®s->gpio_dr);
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return 0;
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}
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int gpio_get_value(unsigned gpio)
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{
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unsigned int port = GPIO_TO_PORT(gpio);
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struct gpio_regs *regs;
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u32 val;
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if (port >= ARRAY_SIZE(gpio_ports))
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return -1;
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gpio &= 0x1f;
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regs = (struct gpio_regs *)gpio_ports[port];
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val = (readl(®s->gpio_psr) >> gpio) & 0x01;
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return val;
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}
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int gpio_request(unsigned gpio, const char *label)
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{
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unsigned int port = GPIO_TO_PORT(gpio);
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if (port >= ARRAY_SIZE(gpio_ports))
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return -1;
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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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return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_IN);
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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int ret = gpio_set_value(gpio, value);
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if (ret < 0)
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return ret;
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return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT);
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}
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#endif
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#ifdef CONFIG_DM_GPIO
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#include <fdtdec.h>
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DECLARE_GLOBAL_DATA_PTR;
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static int mxc_gpio_is_output(struct gpio_regs *regs, int offset)
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{
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u32 val;
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val = readl(®s->gpio_dir);
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return val & (1 << offset) ? 1 : 0;
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}
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static void mxc_gpio_bank_direction(struct gpio_regs *regs, int offset,
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enum mxc_gpio_direction direction)
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{
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u32 l;
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l = readl(®s->gpio_dir);
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switch (direction) {
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case MXC_GPIO_DIRECTION_OUT:
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l |= 1 << offset;
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break;
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case MXC_GPIO_DIRECTION_IN:
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l &= ~(1 << offset);
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}
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writel(l, ®s->gpio_dir);
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}
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static void mxc_gpio_bank_set_value(struct gpio_regs *regs, int offset,
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int value)
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{
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u32 l;
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l = readl(®s->gpio_dr);
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if (value)
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l |= 1 << offset;
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else
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l &= ~(1 << offset);
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writel(l, ®s->gpio_dr);
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}
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static int mxc_gpio_bank_get_value(struct gpio_regs *regs, int offset)
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{
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return (readl(®s->gpio_psr) >> offset) & 0x01;
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}
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/* set GPIO pin 'gpio' as an input */
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static int mxc_gpio_direction_input(struct udevice *dev, unsigned offset)
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{
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struct mxc_bank_info *bank = dev_get_priv(dev);
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/* Configure GPIO direction as input. */
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mxc_gpio_bank_direction(bank->regs, offset, MXC_GPIO_DIRECTION_IN);
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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 mxc_gpio_direction_output(struct udevice *dev, unsigned offset,
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int value)
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{
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struct mxc_bank_info *bank = dev_get_priv(dev);
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/* Configure GPIO output value. */
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mxc_gpio_bank_set_value(bank->regs, offset, value);
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/* Configure GPIO direction as output. */
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mxc_gpio_bank_direction(bank->regs, offset, MXC_GPIO_DIRECTION_OUT);
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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 mxc_gpio_get_value(struct udevice *dev, unsigned offset)
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{
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struct mxc_bank_info *bank = dev_get_priv(dev);
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return mxc_gpio_bank_get_value(bank->regs, offset);
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}
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/* write GPIO OUT value to pin 'gpio' */
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static int mxc_gpio_set_value(struct udevice *dev, unsigned offset,
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int value)
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{
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struct mxc_bank_info *bank = dev_get_priv(dev);
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mxc_gpio_bank_set_value(bank->regs, offset, value);
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return 0;
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}
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static int mxc_gpio_get_function(struct udevice *dev, unsigned offset)
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{
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struct mxc_bank_info *bank = dev_get_priv(dev);
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/* GPIOF_FUNC is not implemented yet */
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if (mxc_gpio_is_output(bank->regs, offset))
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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_mxc_ops = {
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.direction_input = mxc_gpio_direction_input,
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.direction_output = mxc_gpio_direction_output,
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.get_value = mxc_gpio_get_value,
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.set_value = mxc_gpio_set_value,
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.get_function = mxc_gpio_get_function,
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};
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static int mxc_gpio_probe(struct udevice *dev)
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{
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struct mxc_bank_info *bank = dev_get_priv(dev);
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struct mxc_gpio_plat *plat = dev_get_platdata(dev);
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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int banknum;
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char name[18], *str;
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banknum = plat->bank_index;
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sprintf(name, "GPIO%d_", banknum + 1);
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str = strdup(name);
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if (!str)
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return -ENOMEM;
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uc_priv->bank_name = str;
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uc_priv->gpio_count = GPIO_PER_BANK;
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bank->regs = plat->regs;
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return 0;
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}
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static int mxc_gpio_bind(struct udevice *dev)
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{
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struct mxc_gpio_plat *plat = dev->platdata;
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fdt_addr_t addr;
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/*
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* If platdata already exsits, directly return.
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* Actually only when DT is not supported, platdata
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* is statically initialized in U_BOOT_DEVICES.Here
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* will return.
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*/
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if (plat)
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return 0;
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addr = dev_get_addr(dev);
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if (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 supported,
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* this can be done by auto-alloc feature, but not using calloc
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* 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->regs = (struct gpio_regs *)addr;
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plat->bank_index = dev->req_seq;
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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 mxc_gpio_ids[] = {
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{ .compatible = "fsl,imx35-gpio" },
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{ }
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};
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U_BOOT_DRIVER(gpio_mxc) = {
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.name = "gpio_mxc",
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.id = UCLASS_GPIO,
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.ops = &gpio_mxc_ops,
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.probe = mxc_gpio_probe,
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.priv_auto_alloc_size = sizeof(struct mxc_bank_info),
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.of_match = mxc_gpio_ids,
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.bind = mxc_gpio_bind,
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};
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#if !CONFIG_IS_ENABLED(OF_CONTROL)
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static const struct mxc_gpio_plat mxc_plat[] = {
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{ 0, (struct gpio_regs *)GPIO1_BASE_ADDR },
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{ 1, (struct gpio_regs *)GPIO2_BASE_ADDR },
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{ 2, (struct gpio_regs *)GPIO3_BASE_ADDR },
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#if defined(CONFIG_MX25) || defined(CONFIG_MX27) || defined(CONFIG_MX51) || \
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defined(CONFIG_MX53) || defined(CONFIG_MX6)
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{ 3, (struct gpio_regs *)GPIO4_BASE_ADDR },
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#endif
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#if defined(CONFIG_MX27) || defined(CONFIG_MX53) || defined(CONFIG_MX6)
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{ 4, (struct gpio_regs *)GPIO5_BASE_ADDR },
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{ 5, (struct gpio_regs *)GPIO6_BASE_ADDR },
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#endif
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#if defined(CONFIG_MX53) || defined(CONFIG_MX6)
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{ 6, (struct gpio_regs *)GPIO7_BASE_ADDR },
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#endif
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};
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U_BOOT_DEVICES(mxc_gpios) = {
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{ "gpio_mxc", &mxc_plat[0] },
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{ "gpio_mxc", &mxc_plat[1] },
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{ "gpio_mxc", &mxc_plat[2] },
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#if defined(CONFIG_MX25) || defined(CONFIG_MX27) || defined(CONFIG_MX51) || \
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defined(CONFIG_MX53) || defined(CONFIG_MX6)
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{ "gpio_mxc", &mxc_plat[3] },
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#endif
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#if defined(CONFIG_MX27) || defined(CONFIG_MX53) || defined(CONFIG_MX6)
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{ "gpio_mxc", &mxc_plat[4] },
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{ "gpio_mxc", &mxc_plat[5] },
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#endif
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#if defined(CONFIG_MX53) || defined(CONFIG_MX6)
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{ "gpio_mxc", &mxc_plat[6] },
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#endif
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};
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#endif
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#endif
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