mirror of
https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
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>
136 lines
3.6 KiB
C
136 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019 Marek Vasut <marek.vasut@gmail.com>
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*/
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <errno.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <linux/bitops.h>
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#define P(bank) (0x0000 + (bank) * 4)
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#define PSR(bank) (0x0100 + (bank) * 4)
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#define PPR(bank) (0x0200 + (bank) * 4)
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#define PM(bank) (0x0300 + (bank) * 4)
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#define PMC(bank) (0x0400 + (bank) * 4)
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#define PFC(bank) (0x0500 + (bank) * 4)
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#define PFCE(bank) (0x0600 + (bank) * 4)
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#define PNOT(bank) (0x0700 + (bank) * 4)
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#define PMSR(bank) (0x0800 + (bank) * 4)
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#define PMCSR(bank) (0x0900 + (bank) * 4)
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#define PFCAE(bank) (0x0A00 + (bank) * 4)
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#define PIBC(bank) (0x4000 + (bank) * 4)
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#define PBDC(bank) (0x4100 + (bank) * 4)
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#define PIPC(bank) (0x4200 + (bank) * 4)
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#define RZA1_MAX_GPIO_PER_BANK 16
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DECLARE_GLOBAL_DATA_PTR;
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struct r7s72100_gpio_priv {
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void __iomem *regs;
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int bank;
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};
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static int r7s72100_gpio_get_value(struct udevice *dev, unsigned offset)
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{
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struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
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return !!(readw(priv->regs + PPR(priv->bank)) & BIT(offset));
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}
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static int r7s72100_gpio_set_value(struct udevice *dev, unsigned line,
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int value)
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{
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struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
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writel(BIT(line + 16) | (value ? BIT(line) : 0),
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priv->regs + PSR(priv->bank));
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return 0;
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}
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static void r7s72100_gpio_set_direction(struct udevice *dev, unsigned line,
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bool output)
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{
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struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
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writel(BIT(line + 16), priv->regs + PMCSR(priv->bank));
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writel(BIT(line + 16) | (output ? 0 : BIT(line)),
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priv->regs + PMSR(priv->bank));
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clrsetbits_le16(priv->regs + PIBC(priv->bank), BIT(line),
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output ? 0 : BIT(line));
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}
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static int r7s72100_gpio_direction_input(struct udevice *dev, unsigned offset)
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{
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r7s72100_gpio_set_direction(dev, offset, false);
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return 0;
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}
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static int r7s72100_gpio_direction_output(struct udevice *dev, unsigned offset,
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int value)
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{
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/* write GPIO value to output before selecting output mode of pin */
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r7s72100_gpio_set_value(dev, offset, value);
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r7s72100_gpio_set_direction(dev, offset, true);
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return 0;
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}
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static int r7s72100_gpio_get_function(struct udevice *dev, unsigned offset)
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{
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struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
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if (readw(priv->regs + PM(priv->bank)) & BIT(offset))
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return GPIOF_INPUT;
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else
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return GPIOF_OUTPUT;
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}
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static const struct dm_gpio_ops r7s72100_gpio_ops = {
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.direction_input = r7s72100_gpio_direction_input,
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.direction_output = r7s72100_gpio_direction_output,
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.get_value = r7s72100_gpio_get_value,
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.set_value = r7s72100_gpio_set_value,
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.get_function = r7s72100_gpio_get_function,
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};
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static int r7s72100_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 r7s72100_gpio_priv *priv = dev_get_priv(dev);
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struct fdtdec_phandle_args args;
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int node = dev_of_offset(dev);
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int ret;
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fdt_addr_t addr_base;
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uc_priv->bank_name = dev->name;
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dev = dev_get_parent(dev);
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addr_base = dev_read_addr(dev);
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if (addr_base == FDT_ADDR_T_NONE)
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return -EINVAL;
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priv->regs = (void __iomem *)addr_base;
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ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges",
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NULL, 3, 0, &args);
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priv->bank = ret == 0 ? (args.args[1] / RZA1_MAX_GPIO_PER_BANK) : -1;
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uc_priv->gpio_count = ret == 0 ? args.args[2] : RZA1_MAX_GPIO_PER_BANK;
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return 0;
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}
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U_BOOT_DRIVER(r7s72100_gpio) = {
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.name = "r7s72100-gpio",
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.id = UCLASS_GPIO,
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.ops = &r7s72100_gpio_ops,
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.priv_auto = sizeof(struct r7s72100_gpio_priv),
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.probe = r7s72100_gpio_probe,
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};
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