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441d0cfff1
Add driver model support with this driver. In this case the platform data is in the driver. It would be better to put this into an SOC-specific file, but this is best attempted when more boards are moved over to use driver model. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Igor Grinberg <grinberg@compulab.co.il>
439 lines
9.6 KiB
C
439 lines
9.6 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_NAME_SIZE 20
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#define GPIO_PER_BANK 32
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struct mxc_gpio_plat {
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struct gpio_regs *regs;
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};
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struct mxc_bank_info {
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char label[GPIO_PER_BANK][GPIO_NAME_SIZE];
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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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[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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[4] = GPIO5_BASE_ADDR,
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[5] = GPIO6_BASE_ADDR,
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#endif
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#if defined(CONFIG_MX53) || defined(CONFIG_MX6)
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[6] = GPIO7_BASE_ADDR,
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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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/**
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* gpio_is_requested() - check if a GPIO has been requested
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*
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* @bank: Bank to check
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* @offset: GPIO offset within bank to check
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* @return true if marked as requested, false if not
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*/
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static inline bool gpio_is_requested(struct mxc_bank_info *bank, int offset)
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{
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return *bank->label[offset] != '\0';
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}
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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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static int mxc_gpio_bank_get_output_value(struct gpio_regs *regs, int offset)
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{
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return (readl(®s->gpio_dr) >> offset) & 0x01;
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}
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static int check_requested(struct udevice *dev, unsigned offset,
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const char *func)
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{
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struct mxc_bank_info *bank = dev_get_priv(dev);
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struct gpio_dev_priv *uc_priv = dev->uclass_priv;
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if (!gpio_is_requested(bank, offset)) {
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printf("mxc_gpio: %s: error: gpio %s%d not requested\n",
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func, uc_priv->bank_name, offset);
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return -EPERM;
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}
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return 0;
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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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int ret;
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ret = check_requested(dev, offset, __func__);
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if (ret)
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return ret;
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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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int ret;
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ret = check_requested(dev, offset, __func__);
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if (ret)
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return ret;
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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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int ret;
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ret = check_requested(dev, offset, __func__);
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if (ret)
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return ret;
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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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int ret;
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ret = check_requested(dev, offset, __func__);
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if (ret)
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return ret;
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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_state(struct udevice *dev, unsigned int offset,
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char *buf, int bufsize)
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{
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struct gpio_dev_priv *uc_priv = dev->uclass_priv;
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struct mxc_bank_info *bank = dev_get_priv(dev);
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const char *label;
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bool requested;
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bool is_output;
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int size;
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label = bank->label[offset];
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is_output = mxc_gpio_is_output(bank->regs, offset);
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size = snprintf(buf, bufsize, "%s%d: ",
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uc_priv->bank_name ? uc_priv->bank_name : "", offset);
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buf += size;
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bufsize -= size;
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requested = gpio_is_requested(bank, offset);
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snprintf(buf, bufsize, "%s: %d [%c]%s%s",
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is_output ? "out" : " in",
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is_output ?
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mxc_gpio_bank_get_output_value(bank->regs, offset) :
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mxc_gpio_bank_get_value(bank->regs, offset),
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requested ? 'x' : ' ',
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requested ? " " : "",
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label);
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return 0;
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}
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static int mxc_gpio_request(struct udevice *dev, unsigned offset,
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const char *label)
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{
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struct mxc_bank_info *bank = dev_get_priv(dev);
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if (gpio_is_requested(bank, offset))
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return -EBUSY;
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strncpy(bank->label[offset], label, GPIO_NAME_SIZE);
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bank->label[offset][GPIO_NAME_SIZE - 1] = '\0';
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return 0;
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}
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static int mxc_gpio_free(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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int ret;
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ret = check_requested(dev, offset, __func__);
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if (ret)
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return ret;
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bank->label[offset][0] = '\0';
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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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if (!gpio_is_requested(bank, offset))
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return GPIOF_UNUSED;
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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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.request = mxc_gpio_request,
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.free = mxc_gpio_free,
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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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.get_state = mxc_gpio_get_state,
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};
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static const struct mxc_gpio_plat mxc_plat[] = {
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{ (struct gpio_regs *)GPIO1_BASE_ADDR },
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{ (struct gpio_regs *)GPIO2_BASE_ADDR },
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{ (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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{ (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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{ (struct gpio_regs *)GPIO5_BASE_ADDR },
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{ (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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{ (struct gpio_regs *)GPIO7_BASE_ADDR },
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#endif
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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->uclass_priv;
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int banknum;
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char name[18], *str;
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banknum = plat - mxc_plat;
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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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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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};
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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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