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57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
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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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* SPDX-License-Identifier: GPL-2.0+
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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/device.h>
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#include <dm/util.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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DECLARE_GLOBAL_DATA_PTR;
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#define H32MX_MAX_FREQ 90000000
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static ulong sama5d4_h32mx_clk_get_rate(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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ulong rate = gd->arch.mck_rate_hz;
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if (readl(&pmc->mckr) & AT91_PMC_MCKR_H32MXDIV)
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rate /= 2;
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if (rate > H32MX_MAX_FREQ)
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dm_warn("H32MX clock is too fast\n");
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return rate;
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}
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static struct clk_ops sama5d4_h32mx_clk_ops = {
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.get_rate = sama5d4_h32mx_clk_get_rate,
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};
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static int sama5d4_h32mx_clk_probe(struct udevice *dev)
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{
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return at91_pmc_core_probe(dev);
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}
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static const struct udevice_id sama5d4_h32mx_clk_match[] = {
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{ .compatible = "atmel,sama5d4-clk-h32mx" },
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{}
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};
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U_BOOT_DRIVER(sama5d4_h32mx_clk) = {
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.name = "sama5d4-h32mx-clk",
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.id = UCLASS_CLK,
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.of_match = sama5d4_h32mx_clk_match,
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.probe = sama5d4_h32mx_clk_probe,
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.platdata_auto_alloc_size = sizeof(struct pmc_platdata),
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.ops = &sama5d4_h32mx_clk_ops,
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};
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