drivers/clk/at91/clk-main.c

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