mirror of
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>
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2016 Imagination Technologies
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*/
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#include <common.h>
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#include <clk-uclass.h>
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#include <dm.h>
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#include <dt-bindings/clock/boston-clock.h>
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#include <regmap.h>
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#include <syscon.h>
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struct clk_boston {
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struct regmap *regmap;
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};
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#define BOSTON_PLAT_MMCMDIV 0x30
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# define BOSTON_PLAT_MMCMDIV_CLK0DIV (0xff << 0)
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# define BOSTON_PLAT_MMCMDIV_INPUT (0xff << 8)
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# define BOSTON_PLAT_MMCMDIV_MUL (0xff << 16)
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# define BOSTON_PLAT_MMCMDIV_CLK1DIV (0xff << 24)
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static uint32_t ext_field(uint32_t val, uint32_t mask)
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{
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return (val & mask) >> (ffs(mask) - 1);
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}
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static ulong clk_boston_get_rate(struct clk *clk)
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{
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struct clk_boston *state = dev_get_platdata(clk->dev);
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uint32_t in_rate, mul, div;
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uint mmcmdiv;
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int err;
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err = regmap_read(state->regmap, BOSTON_PLAT_MMCMDIV, &mmcmdiv);
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if (err)
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return 0;
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in_rate = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_INPUT);
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mul = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_MUL);
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switch (clk->id) {
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case BOSTON_CLK_SYS:
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div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK0DIV);
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break;
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case BOSTON_CLK_CPU:
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div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK1DIV);
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break;
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default:
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return 0;
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}
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return (in_rate * mul * 1000000) / div;
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}
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const struct clk_ops clk_boston_ops = {
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.get_rate = clk_boston_get_rate,
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};
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static int clk_boston_ofdata_to_platdata(struct udevice *dev)
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{
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struct clk_boston *state = dev_get_platdata(dev);
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struct udevice *syscon;
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int err;
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err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
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"regmap", &syscon);
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if (err) {
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pr_err("unable to find syscon device\n");
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return err;
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}
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state->regmap = syscon_get_regmap(syscon);
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if (!state->regmap) {
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pr_err("unable to find regmap\n");
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return -ENODEV;
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}
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return 0;
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}
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static const struct udevice_id clk_boston_match[] = {
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{
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.compatible = "img,boston-clock",
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},
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(clk_boston) = {
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.name = "boston_clock",
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.id = UCLASS_CLK,
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.of_match = clk_boston_match,
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.ofdata_to_platdata = clk_boston_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct clk_boston),
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.ops = &clk_boston_ops,
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};
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