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      1 // SPDX-License-Identifier: GPL-2.0+
      2 /*
      3  * Copyright (C) 2016 Atmel Corporation
      4  *               Wenyou.Yang <wenyou.yang (at) 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 
     14 DECLARE_GLOBAL_DATA_PTR;
     15 
     16 static 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 
     27 static ulong main_osc_clk_get_rate(struct clk *clk)
     28 {
     29 	return gd->arch.main_clk_rate_hz;
     30 }
     31 
     32 static struct clk_ops main_osc_clk_ops = {
     33 	.enable = main_osc_clk_enable,
     34 	.get_rate = main_osc_clk_get_rate,
     35 };
     36 
     37 static int main_osc_clk_probe(struct udevice *dev)
     38 {
     39 	return at91_pmc_core_probe(dev);
     40 }
     41 
     42 static const struct udevice_id main_osc_clk_match[] = {
     43 	{ .compatible = "atmel,at91sam9x5-clk-main" },
     44 	{}
     45 };
     46 
     47 U_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