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
main_osc_clk_enable(struct clk * clk)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
main_osc_clk_get_rate(struct clk * clk)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
main_osc_clk_probe(struct udevice * dev)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