1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2018 Amarula Solutions.
4 * Author: Jagan Teki <jagan@amarulasolutions.com>
5 */
6
7 #include <common.h>
8 #include <clk-uclass.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <reset.h>
12 #include <asm/io.h>
13 #include <asm/arch/ccu.h>
14 #include <linux/log2.h>
15
priv_to_gate(struct ccu_priv * priv,unsigned long id)16 static const struct ccu_clk_gate *priv_to_gate(struct ccu_priv *priv,
17 unsigned long id)
18 {
19 return &priv->desc->gates[id];
20 }
21
sunxi_set_gate(struct clk * clk,bool on)22 static int sunxi_set_gate(struct clk *clk, bool on)
23 {
24 struct ccu_priv *priv = dev_get_priv(clk->dev);
25 const struct ccu_clk_gate *gate = priv_to_gate(priv, clk->id);
26 u32 reg;
27
28 if (!(gate->flags & CCU_CLK_F_IS_VALID)) {
29 printf("%s: (CLK#%ld) unhandled\n", __func__, clk->id);
30 return 0;
31 }
32
33 debug("%s: (CLK#%ld) off#0x%x, BIT(%d)\n", __func__,
34 clk->id, gate->off, ilog2(gate->bit));
35
36 reg = readl(priv->base + gate->off);
37 if (on)
38 reg |= gate->bit;
39 else
40 reg &= ~gate->bit;
41
42 writel(reg, priv->base + gate->off);
43
44 return 0;
45 }
46
sunxi_clk_enable(struct clk * clk)47 static int sunxi_clk_enable(struct clk *clk)
48 {
49 return sunxi_set_gate(clk, true);
50 }
51
sunxi_clk_disable(struct clk * clk)52 static int sunxi_clk_disable(struct clk *clk)
53 {
54 return sunxi_set_gate(clk, false);
55 }
56
57 struct clk_ops sunxi_clk_ops = {
58 .enable = sunxi_clk_enable,
59 .disable = sunxi_clk_disable,
60 };
61
sunxi_clk_probe(struct udevice * dev)62 int sunxi_clk_probe(struct udevice *dev)
63 {
64 struct ccu_priv *priv = dev_get_priv(dev);
65 struct clk_bulk clk_bulk;
66 struct reset_ctl_bulk rst_bulk;
67 int ret;
68
69 priv->base = dev_read_addr_ptr(dev);
70 if (!priv->base)
71 return -ENOMEM;
72
73 priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
74 if (!priv->desc)
75 return -EINVAL;
76
77 ret = clk_get_bulk(dev, &clk_bulk);
78 if (!ret)
79 clk_enable_bulk(&clk_bulk);
80
81 ret = reset_get_bulk(dev, &rst_bulk);
82 if (!ret)
83 reset_deassert_bulk(&rst_bulk);
84
85 return 0;
86 }
87