mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-05 18:56:15 +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>
111 lines
2.2 KiB
C
111 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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 <clk-uclass.h>
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#include <dm.h>
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#include <linux/io.h>
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#include <mach/at91_pmc.h>
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#include "pmc.h"
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#define SYSTEM_MAX_ID 31
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/**
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* at91_system_clk_bind() - for the system clock driver
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* Recursively bind its children as clk devices.
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*
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* @return: 0 on success, or negative error code on failure
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*/
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static int at91_system_clk_bind(struct udevice *dev)
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{
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return at91_clk_sub_device_bind(dev, "system-clk");
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}
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static const struct udevice_id at91_system_clk_match[] = {
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{ .compatible = "atmel,at91rm9200-clk-system" },
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{}
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};
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U_BOOT_DRIVER(at91_system_clk) = {
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.name = "at91-system-clk",
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.id = UCLASS_MISC,
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.of_match = at91_system_clk_match,
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.bind = at91_system_clk_bind,
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};
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/*----------------------------------------------------------*/
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static inline int is_pck(int id)
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{
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return (id >= 8) && (id <= 15);
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}
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static ulong system_clk_get_rate(struct clk *clk)
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{
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struct clk clk_dev;
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int ret;
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ret = clk_get_by_index(clk->dev, 0, &clk_dev);
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if (ret)
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return -EINVAL;
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return clk_get_rate(&clk_dev);
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}
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static ulong system_clk_set_rate(struct clk *clk, ulong rate)
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{
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struct clk clk_dev;
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int ret;
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ret = clk_get_by_index(clk->dev, 0, &clk_dev);
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if (ret)
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return -EINVAL;
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return clk_set_rate(&clk_dev, rate);
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}
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static int system_clk_enable(struct clk *clk)
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{
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struct pmc_platdata *plat = dev_get_platdata(clk->dev);
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struct at91_pmc *pmc = plat->reg_base;
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u32 mask;
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if (clk->id > SYSTEM_MAX_ID)
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return -EINVAL;
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mask = BIT(clk->id);
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writel(mask, &pmc->scer);
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/**
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* For the programmable clocks the Ready status in the PMC
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* status register should be checked after enabling.
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* For other clocks this is unnecessary.
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*/
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if (!is_pck(clk->id))
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return 0;
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while (!(readl(&pmc->sr) & mask))
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;
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return 0;
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}
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static struct clk_ops system_clk_ops = {
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.of_xlate = at91_clk_of_xlate,
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.get_rate = system_clk_get_rate,
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.set_rate = system_clk_set_rate,
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.enable = system_clk_enable,
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};
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U_BOOT_DRIVER(system_clk) = {
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.name = "system-clk",
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.id = UCLASS_CLK,
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.probe = at91_clk_probe,
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.platdata_auto_alloc_size = sizeof(struct pmc_platdata),
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.ops = &system_clk_ops,
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};
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