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[u-boot] / drivers / clk / clk_bcm6345.c
1 /*
2  * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
3  *
4  * Derived from linux/arch/mips/bcm63xx/clk.c:
5  *      Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  */
9
10 #include <common.h>
11 #include <clk-uclass.h>
12 #include <dm.h>
13 #include <errno.h>
14 #include <asm/io.h>
15
16 #define MAX_CLKS        32
17
18 struct bcm6345_clk_priv {
19         void __iomem *regs;
20 };
21
22 static int bcm6345_clk_enable(struct clk *clk)
23 {
24         struct bcm6345_clk_priv *priv = dev_get_priv(clk->dev);
25
26         if (clk->id >= MAX_CLKS)
27                 return -EINVAL;
28
29         setbits_be32(priv->regs, BIT(clk->id));
30
31         return 0;
32 }
33
34 static int bcm6345_clk_disable(struct clk *clk)
35 {
36         struct bcm6345_clk_priv *priv = dev_get_priv(clk->dev);
37
38         if (clk->id >= MAX_CLKS)
39                 return -EINVAL;
40
41         clrbits_be32(priv->regs, BIT(clk->id));
42
43         return 0;
44 }
45
46 static struct clk_ops bcm6345_clk_ops = {
47         .disable = bcm6345_clk_disable,
48         .enable = bcm6345_clk_enable,
49 };
50
51 static const struct udevice_id bcm6345_clk_ids[] = {
52         { .compatible = "brcm,bcm6345-clk" },
53         { /* sentinel */ }
54 };
55
56 static int bcm63xx_clk_probe(struct udevice *dev)
57 {
58         struct bcm6345_clk_priv *priv = dev_get_priv(dev);
59         fdt_addr_t addr;
60         fdt_size_t size;
61
62         addr = devfdt_get_addr_size_index(dev, 0, &size);
63         if (addr == FDT_ADDR_T_NONE)
64                 return -EINVAL;
65
66         priv->regs = ioremap(addr, size);
67
68         return 0;
69 }
70
71 U_BOOT_DRIVER(clk_bcm6345) = {
72         .name = "clk_bcm6345",
73         .id = UCLASS_CLK,
74         .of_match = bcm6345_clk_ids,
75         .ops = &bcm6345_clk_ops,
76         .probe = bcm63xx_clk_probe,
77         .priv_auto_alloc_size = sizeof(struct bcm6345_clk_priv),
78 };