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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