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https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
166 lines
3.6 KiB
C
166 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Microchip Technology Inc
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* Purna Chandra Mandal <purna.mandal@microchip.com>
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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 <malloc.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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#include <linux/bitops.h>
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#include <linux/compat.h>
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#include <mach/pic32.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Peripheral Pin Control */
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struct pic32_reg_port {
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struct pic32_reg_atomic ansel;
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struct pic32_reg_atomic tris;
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struct pic32_reg_atomic port;
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struct pic32_reg_atomic lat;
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struct pic32_reg_atomic open_drain;
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struct pic32_reg_atomic cnpu;
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struct pic32_reg_atomic cnpd;
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struct pic32_reg_atomic cncon;
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};
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enum {
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MICROCHIP_GPIO_DIR_OUT,
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MICROCHIP_GPIO_DIR_IN,
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MICROCHIP_GPIOS_PER_BANK = 16,
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};
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struct pic32_gpio_priv {
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struct pic32_reg_port *regs;
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char name[2];
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};
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static int pic32_gpio_get_value(struct udevice *dev, unsigned offset)
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{
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struct pic32_gpio_priv *priv = dev_get_priv(dev);
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return !!(readl(&priv->regs->port.raw) & BIT(offset));
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}
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static int pic32_gpio_set_value(struct udevice *dev, unsigned offset,
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int value)
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{
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struct pic32_gpio_priv *priv = dev_get_priv(dev);
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int mask = BIT(offset);
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if (value)
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writel(mask, &priv->regs->port.set);
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else
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writel(mask, &priv->regs->port.clr);
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return 0;
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}
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static int pic32_gpio_direction(struct udevice *dev, unsigned offset)
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{
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struct pic32_gpio_priv *priv = dev_get_priv(dev);
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/* pin in analog mode ? */
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if (readl(&priv->regs->ansel.raw) & BIT(offset))
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return -EPERM;
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if (readl(&priv->regs->tris.raw) & BIT(offset))
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return MICROCHIP_GPIO_DIR_IN;
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else
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return MICROCHIP_GPIO_DIR_OUT;
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}
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static int pic32_gpio_direction_input(struct udevice *dev, unsigned offset)
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{
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struct pic32_gpio_priv *priv = dev_get_priv(dev);
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int mask = BIT(offset);
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writel(mask, &priv->regs->ansel.clr);
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writel(mask, &priv->regs->tris.set);
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return 0;
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}
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static int pic32_gpio_direction_output(struct udevice *dev,
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unsigned offset, int value)
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{
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struct pic32_gpio_priv *priv = dev_get_priv(dev);
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int mask = BIT(offset);
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writel(mask, &priv->regs->ansel.clr);
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writel(mask, &priv->regs->tris.clr);
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pic32_gpio_set_value(dev, offset, value);
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return 0;
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}
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static int pic32_gpio_get_function(struct udevice *dev, unsigned offset)
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{
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int ret = GPIOF_UNUSED;
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switch (pic32_gpio_direction(dev, offset)) {
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case MICROCHIP_GPIO_DIR_OUT:
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ret = GPIOF_OUTPUT;
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break;
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case MICROCHIP_GPIO_DIR_IN:
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ret = GPIOF_INPUT;
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break;
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default:
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ret = GPIOF_UNUSED;
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break;
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}
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return ret;
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}
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static const struct dm_gpio_ops gpio_pic32_ops = {
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.direction_input = pic32_gpio_direction_input,
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.direction_output = pic32_gpio_direction_output,
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.get_value = pic32_gpio_get_value,
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.set_value = pic32_gpio_set_value,
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.get_function = pic32_gpio_get_function,
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};
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static int pic32_gpio_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct pic32_gpio_priv *priv = dev_get_priv(dev);
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fdt_addr_t addr;
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fdt_size_t size;
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char *end;
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int bank;
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addr = fdtdec_get_addr_size(gd->fdt_blob, dev_of_offset(dev), "reg",
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&size);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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priv->regs = ioremap(addr, size);
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uc_priv->gpio_count = MICROCHIP_GPIOS_PER_BANK;
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/* extract bank name */
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end = strrchr(dev->name, '@');
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bank = trailing_strtoln(dev->name, end);
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priv->name[0] = 'A' + bank;
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uc_priv->bank_name = priv->name;
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return 0;
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}
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static const struct udevice_id pic32_gpio_ids[] = {
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{ .compatible = "microchip,pic32mzda-gpio" },
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{ }
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};
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U_BOOT_DRIVER(gpio_pic32) = {
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.name = "gpio_pic32",
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.id = UCLASS_GPIO,
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.of_match = pic32_gpio_ids,
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.ops = &gpio_pic32_ops,
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.probe = pic32_gpio_probe,
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.priv_auto = sizeof(struct pic32_gpio_priv),
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};
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