1/*
2 * OMAP interface clock support
3 *
4 * Copyright (C) 2013 Texas Instruments, Inc.
5 *
6 * Tero Kristo <t-kristo@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13 * kind, whether express or implied; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/clk-provider.h>
19#include <linux/slab.h>
20#include <linux/of.h>
21#include <linux/of_address.h>
22#include <linux/clk/ti.h>
23#include "clock.h"
24
25#undef pr_fmt
26#define pr_fmt(fmt) "%s: " fmt, __func__
27
28static const struct clk_ops ti_interface_clk_ops = {
29	.init		= &omap2_init_clk_clkdm,
30	.enable		= &omap2_dflt_clk_enable,
31	.disable	= &omap2_dflt_clk_disable,
32	.is_enabled	= &omap2_dflt_clk_is_enabled,
33};
34
35static struct clk *_register_interface(struct device_node *node,
36				       const char *name,
37				       const char *parent_name,
38				       struct clk_omap_reg *reg, u8 bit_idx,
39				       const struct clk_hw_omap_ops *ops)
40{
41	struct clk_init_data init = { NULL };
42	struct clk_hw_omap *clk_hw;
43	struct clk *clk;
44
45	clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
46	if (!clk_hw)
47		return ERR_PTR(-ENOMEM);
48
49	clk_hw->hw.init = &init;
50	clk_hw->ops = ops;
51	memcpy(&clk_hw->enable_reg, reg, sizeof(*reg));
52	clk_hw->enable_bit = bit_idx;
53
54	init.name = name;
55	init.ops = &ti_interface_clk_ops;
56	init.flags = 0;
57
58	init.num_parents = 1;
59	init.parent_names = &parent_name;
60
61	clk = of_ti_clk_register_omap_hw(node, &clk_hw->hw, name);
62
63	if (IS_ERR(clk))
64		kfree(clk_hw);
65
66	return clk;
67}
68
69static void __init _of_ti_interface_clk_setup(struct device_node *node,
70					      const struct clk_hw_omap_ops *ops)
71{
72	struct clk *clk;
73	const char *parent_name;
74	struct clk_omap_reg reg;
75	u8 enable_bit = 0;
76	const char *name;
77	u32 val;
78
79	if (ti_clk_get_reg_addr(node, 0, &reg))
80		return;
81
82	if (!of_property_read_u32(node, "ti,bit-shift", &val))
83		enable_bit = val;
84
85	parent_name = of_clk_get_parent_name(node, 0);
86	if (!parent_name) {
87		pr_err("%pOFn must have a parent\n", node);
88		return;
89	}
90
91	name = ti_dt_clk_name(node);
92	clk = _register_interface(node, name, parent_name, &reg,
93				  enable_bit, ops);
94
95	if (!IS_ERR(clk))
96		of_clk_add_provider(node, of_clk_src_simple_get, clk);
97}
98
99static void __init of_ti_interface_clk_setup(struct device_node *node)
100{
101	_of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
102}
103CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
104	       of_ti_interface_clk_setup);
105
106static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
107{
108	_of_ti_interface_clk_setup(node, &clkhwops_iclk);
109}
110CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
111	       of_ti_no_wait_interface_clk_setup);
112
113#ifdef CONFIG_ARCH_OMAP3
114static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
115{
116	_of_ti_interface_clk_setup(node,
117				   &clkhwops_omap3430es2_iclk_hsotgusb_wait);
118}
119CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
120	       of_ti_hsotgusb_interface_clk_setup);
121
122static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
123{
124	_of_ti_interface_clk_setup(node,
125				   &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
126}
127CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
128	       of_ti_dss_interface_clk_setup);
129
130static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
131{
132	_of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
133}
134CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
135	       of_ti_ssi_interface_clk_setup);
136
137static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
138{
139	_of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
140}
141CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
142	       of_ti_am35xx_interface_clk_setup);
143#endif
144
145#ifdef CONFIG_SOC_OMAP2430
146static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
147{
148	_of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
149}
150CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
151	       of_ti_omap2430_interface_clk_setup);
152#endif
153