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![Tom Rini](/assets/img/avatar_default.png)
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>
182 lines
4.3 KiB
C
182 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Atmel PIO4 pinctrl driver
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*
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* Copyright (C) 2016 Atmel Corporation
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* Wenyou.Yang <wenyou.yang@atmel.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <dm/pinctrl.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <mach/atmel_pio4.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Warning:
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* In order to not introduce confusion between Atmel PIO groups and pinctrl
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* framework groups, Atmel PIO groups will be called banks.
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*/
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struct atmel_pio4_platdata {
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struct atmel_pio4_port *reg_base;
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};
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static const struct pinconf_param conf_params[] = {
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{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
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{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
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{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
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{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
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{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
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{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
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{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
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};
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static u32 atmel_pinctrl_get_pinconf(const void *blob, int node)
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{
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const struct pinconf_param *params;
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u32 param, arg, conf = 0;
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u32 i;
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for (i = 0; i < ARRAY_SIZE(conf_params); i++) {
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params = &conf_params[i];
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if (!fdt_get_property(blob, node, params->property, NULL))
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continue;
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param = params->param;
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arg = params->default_value;
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switch (param) {
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case PIN_CONFIG_BIAS_DISABLE:
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conf &= (~ATMEL_PIO_PUEN_MASK);
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conf &= (~ATMEL_PIO_PDEN_MASK);
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break;
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case PIN_CONFIG_BIAS_PULL_UP:
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conf |= ATMEL_PIO_PUEN_MASK;
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break;
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case PIN_CONFIG_BIAS_PULL_DOWN:
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conf |= ATMEL_PIO_PDEN_MASK;
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break;
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case PIN_CONFIG_DRIVE_OPEN_DRAIN:
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if (arg == 0)
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conf &= (~ATMEL_PIO_OPD_MASK);
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else
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conf |= ATMEL_PIO_OPD_MASK;
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break;
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case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
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if (arg == 0)
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conf |= ATMEL_PIO_SCHMITT_MASK;
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else
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conf &= (~ATMEL_PIO_SCHMITT_MASK);
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break;
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case PIN_CONFIG_INPUT_DEBOUNCE:
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if (arg == 0) {
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conf &= (~ATMEL_PIO_IFEN_MASK);
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conf &= (~ATMEL_PIO_IFSCEN_MASK);
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} else {
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conf |= ATMEL_PIO_IFEN_MASK;
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conf |= ATMEL_PIO_IFSCEN_MASK;
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}
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break;
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default:
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printf("%s: Unsupported configuration parameter: %u\n",
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__func__, param);
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break;
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}
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}
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return conf;
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}
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static inline struct atmel_pio4_port *atmel_pio4_bank_base(struct udevice *dev,
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u32 bank)
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{
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struct atmel_pio4_platdata *plat = dev_get_platdata(dev);
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struct atmel_pio4_port *bank_base =
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(struct atmel_pio4_port *)((u32)plat->reg_base +
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ATMEL_PIO_BANK_OFFSET * bank);
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return bank_base;
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}
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#define MAX_PINMUX_ENTRIES 40
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static int atmel_pinctrl_set_state(struct udevice *dev, struct udevice *config)
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{
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struct atmel_pio4_port *bank_base;
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const void *blob = gd->fdt_blob;
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int node = dev_of_offset(config);
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u32 offset, func, bank, line;
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u32 cells[MAX_PINMUX_ENTRIES];
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u32 i, conf;
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int count;
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conf = atmel_pinctrl_get_pinconf(blob, node);
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count = fdtdec_get_int_array_count(blob, node, "pinmux",
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cells, ARRAY_SIZE(cells));
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if (count < 0) {
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printf("%s: bad pinmux array %d\n", __func__, count);
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return -EINVAL;
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}
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if (count > MAX_PINMUX_ENTRIES) {
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printf("%s: unsupported pinmux array count %d\n",
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__func__, count);
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return -EINVAL;
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}
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for (i = 0 ; i < count; i++) {
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offset = ATMEL_GET_PIN_NO(cells[i]);
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func = ATMEL_GET_PIN_FUNC(cells[i]);
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bank = ATMEL_PIO_BANK(offset);
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line = ATMEL_PIO_LINE(offset);
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bank_base = atmel_pio4_bank_base(dev, bank);
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writel(BIT(line), &bank_base->mskr);
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conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
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conf |= (func & ATMEL_PIO_CFGR_FUNC_MASK);
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writel(conf, &bank_base->cfgr);
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}
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return 0;
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}
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const struct pinctrl_ops atmel_pinctrl_ops = {
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.set_state = atmel_pinctrl_set_state,
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};
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static int atmel_pinctrl_probe(struct udevice *dev)
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{
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struct atmel_pio4_platdata *plat = dev_get_platdata(dev);
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fdt_addr_t addr_base;
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dev = dev_get_parent(dev);
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addr_base = devfdt_get_addr(dev);
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if (addr_base == FDT_ADDR_T_NONE)
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return -EINVAL;
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plat->reg_base = (struct atmel_pio4_port *)addr_base;
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return 0;
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}
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static const struct udevice_id atmel_pinctrl_match[] = {
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{ .compatible = "atmel,sama5d2-pinctrl" },
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{}
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};
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U_BOOT_DRIVER(atmel_pinctrl) = {
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.name = "pinctrl_atmel_pio4",
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.id = UCLASS_PINCTRL,
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.of_match = atmel_pinctrl_match,
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.probe = atmel_pinctrl_probe,
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.platdata_auto_alloc_size = sizeof(struct atmel_pio4_platdata),
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.ops = &atmel_pinctrl_ops,
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};
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