mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-06 03:06:16 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Exynos pinctrl driver common code.
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* Copyright (C) 2016 Samsung Electronics
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* Thomas Abraham <thomas.ab@samsung.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 <asm/io.h>
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#include "pinctrl-exynos.h"
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DECLARE_GLOBAL_DATA_PTR;
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/**
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* exynos_pinctrl_setup_peri: setup pinctrl for a peripheral.
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* conf: soc specific pin configuration data array
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* num_conf: number of configurations in the conf array.
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* base: base address of the pin controller.
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*/
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void exynos_pinctrl_setup_peri(struct exynos_pinctrl_config_data *conf,
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unsigned int num_conf, unsigned long base)
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{
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unsigned int idx, val;
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for (idx = 0; idx < num_conf; idx++) {
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val = readl(base + conf[idx].offset);
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val &= ~(conf[idx].mask);
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val |= conf[idx].value;
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writel(val, base + conf[idx].offset);
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}
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}
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/* given a pin-name, return the address of pin config registers */
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static unsigned long pin_to_bank_base(struct udevice *dev, const char *pin_name,
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u32 *pin)
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{
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struct exynos_pinctrl_priv *priv = dev_get_priv(dev);
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const struct samsung_pin_ctrl *pin_ctrl = priv->pin_ctrl;
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const struct samsung_pin_bank_data *bank_data = pin_ctrl->pin_banks;
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u32 nr_banks = pin_ctrl->nr_banks, idx = 0;
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char bank[10];
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/*
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* The format of the pin name is <bank name>-<pin_number>.
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* Example: gpa0-4 (gpa0 is the bank name and 4 is the pin number.
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*/
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while (pin_name[idx] != '-') {
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bank[idx] = pin_name[idx];
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idx++;
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}
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bank[idx] = '\0';
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*pin = pin_name[++idx] - '0';
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/* lookup the pin bank data using the pin bank name */
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for (idx = 0; idx < nr_banks; idx++)
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if (!strcmp(bank, bank_data[idx].name))
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break;
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return priv->base + bank_data[idx].offset;
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}
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/**
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* exynos_pinctrl_set_state: configure a pin state.
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* dev: the pinctrl device to be configured.
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* config: the state to be configured.
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*/
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int exynos_pinctrl_set_state(struct udevice *dev, struct udevice *config)
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{
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const void *fdt = gd->fdt_blob;
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int node = dev_of_offset(config);
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unsigned int count, idx, pin_num;
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unsigned int pinfunc, pinpud, pindrv;
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unsigned long reg, value;
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const char *name;
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/*
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* refer to the following document for the pinctrl bindings
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* linux/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
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*/
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count = fdt_stringlist_count(fdt, node, "samsung,pins");
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if (count <= 0)
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return -EINVAL;
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pinfunc = fdtdec_get_int(fdt, node, "samsung,pin-function", -1);
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pinpud = fdtdec_get_int(fdt, node, "samsung,pin-pud", -1);
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pindrv = fdtdec_get_int(fdt, node, "samsung,pin-drv", -1);
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for (idx = 0; idx < count; idx++) {
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name = fdt_stringlist_get(fdt, node, "samsung,pins", idx, NULL);
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if (!name)
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continue;
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reg = pin_to_bank_base(dev, name, &pin_num);
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if (pinfunc != -1) {
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value = readl(reg + PIN_CON);
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value &= ~(0xf << (pin_num << 2));
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value |= (pinfunc << (pin_num << 2));
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writel(value, reg + PIN_CON);
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}
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if (pinpud != -1) {
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value = readl(reg + PIN_PUD);
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value &= ~(0x3 << (pin_num << 1));
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value |= (pinpud << (pin_num << 1));
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writel(value, reg + PIN_PUD);
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}
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if (pindrv != -1) {
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value = readl(reg + PIN_DRV);
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value &= ~(0x3 << (pin_num << 1));
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value |= (pindrv << (pin_num << 1));
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writel(value, reg + PIN_DRV);
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}
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}
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return 0;
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}
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int exynos_pinctrl_probe(struct udevice *dev)
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{
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struct exynos_pinctrl_priv *priv;
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fdt_addr_t base;
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priv = dev_get_priv(dev);
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if (!priv)
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return -EINVAL;
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base = devfdt_get_addr(dev);
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if (base == FDT_ADDR_T_NONE)
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return -EINVAL;
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priv->base = base;
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priv->pin_ctrl = (struct samsung_pin_ctrl *)dev_get_driver_data(dev) +
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dev->req_seq;
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return 0;
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}
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