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https://github.com/AsahiLinux/u-boot
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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>
142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) EETS GmbH, 2017, Felix Brack <f.brack@eets.ch>
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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/libfdt.h>
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#include <asm/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct single_pdata {
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fdt_addr_t base; /* first configuration register */
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int offset; /* index of last configuration register */
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u32 mask; /* configuration-value mask bits */
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int width; /* configuration register bit width */
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};
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struct single_fdt_pin_cfg {
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fdt32_t reg; /* configuration register offset */
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fdt32_t val; /* configuration register value */
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};
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/**
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* single_configure_pins() - Configure pins based on FDT data
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*
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* @dev: Pointer to single pin configuration device which is the parent of
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* the pins node holding the pin configuration data.
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* @pins: Pointer to the first element of an array of register/value pairs
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* of type 'struct single_fdt_pin_cfg'. Each such pair describes the
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* the pin to be configured and the value to be used for configuration.
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* This pointer points to a 'pinctrl-single,pins' property in the
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* device-tree.
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* @size: Size of the 'pins' array in bytes.
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* The number of register/value pairs in the 'pins' array therefore
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* equals to 'size / sizeof(struct single_fdt_pin_cfg)'.
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*/
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static int single_configure_pins(struct udevice *dev,
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const struct single_fdt_pin_cfg *pins,
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int size)
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{
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struct single_pdata *pdata = dev->platdata;
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int count = size / sizeof(struct single_fdt_pin_cfg);
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int n, reg;
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u32 val;
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for (n = 0; n < count; n++, pins++) {
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reg = fdt32_to_cpu(pins->reg);
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if ((reg < 0) || (reg > pdata->offset)) {
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dev_dbg(dev, " invalid register offset 0x%08x\n", reg);
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continue;
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}
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reg += pdata->base;
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val = fdt32_to_cpu(pins->val) & pdata->mask;
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switch (pdata->width) {
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case 16:
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writew((readw(reg) & ~pdata->mask) | val, reg);
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break;
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case 32:
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writel((readl(reg) & ~pdata->mask) | val, reg);
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break;
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default:
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dev_warn(dev, "unsupported register width %i\n",
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pdata->width);
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continue;
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}
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dev_dbg(dev, " reg/val 0x%08x/0x%08x\n",reg, val);
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}
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return 0;
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}
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static int single_set_state(struct udevice *dev,
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struct udevice *config)
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{
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const void *fdt = gd->fdt_blob;
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const struct single_fdt_pin_cfg *prop;
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int len;
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prop = fdt_getprop(fdt, dev_of_offset(config), "pinctrl-single,pins",
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&len);
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if (prop) {
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dev_dbg(dev, "configuring pins for %s\n", config->name);
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if (len % sizeof(struct single_fdt_pin_cfg)) {
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dev_dbg(dev, " invalid pin configuration in fdt\n");
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return -FDT_ERR_BADSTRUCTURE;
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}
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single_configure_pins(dev, prop, len);
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len = 0;
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}
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return len;
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}
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static int single_ofdata_to_platdata(struct udevice *dev)
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{
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fdt_addr_t addr;
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u32 of_reg[2];
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int res;
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struct single_pdata *pdata = dev->platdata;
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pdata->width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
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"pinctrl-single,register-width", 0);
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res = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
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"reg", of_reg, 2);
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if (res)
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return res;
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pdata->offset = of_reg[1] - pdata->width / 8;
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addr = devfdt_get_addr(dev);
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if (addr == FDT_ADDR_T_NONE) {
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dev_dbg(dev, "no valid base register address\n");
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return -EINVAL;
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}
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pdata->base = addr;
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pdata->mask = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
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"pinctrl-single,function-mask",
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0xffffffff);
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return 0;
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}
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const struct pinctrl_ops single_pinctrl_ops = {
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.set_state = single_set_state,
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};
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static const struct udevice_id single_pinctrl_match[] = {
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{ .compatible = "pinctrl-single" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(single_pinctrl) = {
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.name = "single-pinctrl",
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.id = UCLASS_PINCTRL,
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.of_match = single_pinctrl_match,
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.ops = &single_pinctrl_ops,
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.flags = DM_FLAG_PRE_RELOC,
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.platdata_auto_alloc_size = sizeof(struct single_pdata),
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.ofdata_to_platdata = single_ofdata_to_platdata,
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};
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