LXR uboot/drivers/clk/at91/clk-main.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2016 Atmel Corporation
   4 *               Wenyou.Yang <wenyou.yang@atmel.com>
   5 */
   6
   7#include <common.h>
   8#include <clk-uclass.h>
   9#include <dm.h>
  10#include <linux/io.h>
  11#include <mach/at91_pmc.h>
  12#include "pmc.h"
  13
  14DECLARE_GLOBAL_DATA_PTR;
  15
  16static int main_osc_clk_enable(struct clk *clk)
  17{
  18        struct pmc_platdata *plat = dev_get_platdata(clk->dev);
  19        struct at91_pmc *pmc = plat->reg_base;
  20
  21        if (readl(&pmc->sr) & AT91_PMC_MOSCSELS)
  22                return 0;
  23
  24        return -EINVAL;
  25}
  26
  27static ulong main_osc_clk_get_rate(struct clk *clk)
  28{
  29        return gd->arch.main_clk_rate_hz;
  30}
  31
  32static struct clk_ops main_osc_clk_ops = {
  33        .enable = main_osc_clk_enable,
  34        .get_rate = main_osc_clk_get_rate,
  35};
  36
  37static int main_osc_clk_probe(struct udevice *dev)
  38{
  39        return at91_pmc_core_probe(dev);
  40}
  41
  42static const struct udevice_id main_osc_clk_match[] = {
  43        { .compatible = "atmel,at91sam9x5-clk-main" },
  44        {}
  45};
  46
  47U_BOOT_DRIVER(at91sam9x5_main_osc_clk) = {
  48        .name = "at91sam9x5-main-osc-clk",
  49        .id = UCLASS_CLK,
  50        .of_match = main_osc_clk_match,
  51        .probe = main_osc_clk_probe,
  52        .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
  53        .ops = &main_osc_clk_ops,
  54};
  55