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[u-boot] / drivers / clk / at91 / clk-plla.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
14 DECLARE_GLOBAL_DATA_PTR;
15
16 static int plla_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_LOCKA)
22                 return 0;
23
24         return -EINVAL;
25 }
26
27 static ulong plla_clk_get_rate(struct clk *clk)
28 {
29         return gd->arch.plla_rate_hz;
30 }
31
32 static struct clk_ops plla_clk_ops = {
33         .enable = plla_clk_enable,
34         .get_rate = plla_clk_get_rate,
35 };
36
37 static int plla_clk_probe(struct udevice *dev)
38 {
39         return at91_pmc_core_probe(dev);
40 }
41
42 static const struct udevice_id plla_clk_match[] = {
43         { .compatible = "atmel,sama5d3-clk-pll" },
44         {}
45 };
46
47 U_BOOT_DRIVER(at91_plla_clk) = {
48         .name = "at91-plla-clk",
49         .id = UCLASS_CLK,
50         .of_match = plla_clk_match,
51         .probe = plla_clk_probe,
52         .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
53         .ops = &plla_clk_ops,
54 };