mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-16 23:18:51 +09:00
![Simon Glass](/assets/img/avatar_default.png)
In U-Boot -ENODEV means that there is no device. When there is a problem with the device, drivers should return an error like -ENXIO or -EREMOTEIO. When the device tree properties cannot be read correct , they should return -EINVAL. Update various GPIO drivers to follow this rule, to help with consistency for future driver writers. Signed-off-by: Simon Glass <sjg@chromium.org> Reported-by: Adam Ford <aford173@gmail.com>
230 lines
5.3 KiB
C
230 lines
5.3 KiB
C
/*
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* Copyright 2016 Freescale Semiconductor, Inc.
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*
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* RGPIO2P driver for the Freescale i.MX7ULP.
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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 <asm/gpio.h>
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#include <asm/io.h>
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#include <malloc.h>
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DECLARE_GLOBAL_DATA_PTR;
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enum imx_rgpio2p_direction {
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IMX_RGPIO2P_DIRECTION_IN,
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IMX_RGPIO2P_DIRECTION_OUT,
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};
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#define GPIO_PER_BANK 32
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struct imx_rgpio2p_data {
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struct gpio_regs *regs;
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};
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struct imx_rgpio2p_plat {
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int bank_index;
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struct gpio_regs *regs;
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};
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static int imx_rgpio2p_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_pddr);
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return val & (1 << offset) ? 1 : 0;
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}
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static void imx_rgpio2p_bank_direction(struct gpio_regs *regs, int offset,
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enum imx_rgpio2p_direction direction)
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{
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u32 l;
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l = readl(®s->gpio_pddr);
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switch (direction) {
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case IMX_RGPIO2P_DIRECTION_OUT:
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l |= 1 << offset;
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break;
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case IMX_RGPIO2P_DIRECTION_IN:
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l &= ~(1 << offset);
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}
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writel(l, ®s->gpio_pddr);
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}
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static void imx_rgpio2p_bank_set_value(struct gpio_regs *regs, int offset,
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int value)
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{
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if (value)
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writel((1 << offset), ®s->gpio_psor);
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else
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writel((1 << offset), ®s->gpio_pcor);
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}
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static int imx_rgpio2p_bank_get_value(struct gpio_regs *regs, int offset)
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{
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return (readl(®s->gpio_pdir) >> offset) & 0x01;
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}
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static int imx_rgpio2p_direction_input(struct udevice *dev, unsigned offset)
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{
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struct imx_rgpio2p_data *bank = dev_get_priv(dev);
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/* Configure GPIO direction as input. */
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imx_rgpio2p_bank_direction(bank->regs, offset, IMX_RGPIO2P_DIRECTION_IN);
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return 0;
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}
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static int imx_rgpio2p_direction_output(struct udevice *dev, unsigned offset,
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int value)
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{
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struct imx_rgpio2p_data *bank = dev_get_priv(dev);
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/* Configure GPIO output value. */
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imx_rgpio2p_bank_set_value(bank->regs, offset, value);
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/* Configure GPIO direction as output. */
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imx_rgpio2p_bank_direction(bank->regs, offset, IMX_RGPIO2P_DIRECTION_OUT);
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return 0;
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}
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static int imx_rgpio2p_get_value(struct udevice *dev, unsigned offset)
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{
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struct imx_rgpio2p_data *bank = dev_get_priv(dev);
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return imx_rgpio2p_bank_get_value(bank->regs, offset);
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}
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static int imx_rgpio2p_set_value(struct udevice *dev, unsigned offset,
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int value)
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{
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struct imx_rgpio2p_data *bank = dev_get_priv(dev);
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imx_rgpio2p_bank_set_value(bank->regs, offset, value);
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return 0;
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}
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static int imx_rgpio2p_get_function(struct udevice *dev, unsigned offset)
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{
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struct imx_rgpio2p_data *bank = dev_get_priv(dev);
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/* GPIOF_FUNC is not implemented yet */
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if (imx_rgpio2p_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 imx_rgpio2p_ops = {
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.direction_input = imx_rgpio2p_direction_input,
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.direction_output = imx_rgpio2p_direction_output,
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.get_value = imx_rgpio2p_get_value,
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.set_value = imx_rgpio2p_set_value,
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.get_function = imx_rgpio2p_get_function,
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};
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static int imx_rgpio2p_probe(struct udevice *dev)
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{
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struct imx_rgpio2p_data *bank = dev_get_priv(dev);
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struct imx_rgpio2p_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 imx_rgpio2p_bind(struct udevice *dev)
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{
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struct imx_rgpio2p_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 = devfdt_get_addr_index(dev, 1);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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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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* For example imx_rgpio2p_plat uses platform data rather than device
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* tree.
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*
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* NOTE: DO NOT COPY this code if you are using device tree.
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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 imx_rgpio2p_ids[] = {
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{ .compatible = "fsl,imx7ulp-gpio" },
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{ }
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};
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U_BOOT_DRIVER(imx_rgpio2p) = {
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.name = "imx_rgpio2p",
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.id = UCLASS_GPIO,
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.ops = &imx_rgpio2p_ops,
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.probe = imx_rgpio2p_probe,
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.priv_auto_alloc_size = sizeof(struct imx_rgpio2p_plat),
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.of_match = imx_rgpio2p_ids,
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.bind = imx_rgpio2p_bind,
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};
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#if !CONFIG_IS_ENABLED(OF_CONTROL)
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static const struct imx_rgpio2p_plat imx_plat[] = {
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{ 0, (struct gpio_regs *)RGPIO2P_GPIO1_BASE_ADDR },
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{ 1, (struct gpio_regs *)RGPIO2P_GPIO2_BASE_ADDR },
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{ 2, (struct gpio_regs *)RGPIO2P_GPIO3_BASE_ADDR },
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{ 3, (struct gpio_regs *)RGPIO2P_GPIO4_BASE_ADDR },
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{ 4, (struct gpio_regs *)RGPIO2P_GPIO5_BASE_ADDR },
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{ 5, (struct gpio_regs *)RGPIO2P_GPIO6_BASE_ADDR },
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};
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U_BOOT_DEVICES(imx_rgpio2ps) = {
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{ "imx_rgpio2p", &imx_plat[0] },
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{ "imx_rgpio2p", &imx_plat[1] },
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{ "imx_rgpio2p", &imx_plat[2] },
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{ "imx_rgpio2p", &imx_plat[3] },
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{ "imx_rgpio2p", &imx_plat[4] },
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{ "imx_rgpio2p", &imx_plat[5] },
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};
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#endif
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