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
28 static 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
_register_interface(struct device * dev,const char * name,const char * parent_name,struct clk_omap_reg * reg,u8 bit_idx,const struct clk_hw_omap_ops * ops)35 static struct clk *_register_interface(struct device *dev, const char *name,
36 const char *parent_name,
37 struct clk_omap_reg *reg, u8 bit_idx,
38 const struct clk_hw_omap_ops *ops)
39 {
40 struct clk_init_data init = { NULL };
41 struct clk_hw_omap *clk_hw;
42 struct clk *clk;
43
44 clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
45 if (!clk_hw)
46 return ERR_PTR(-ENOMEM);
47
48 clk_hw->hw.init = &init;
49 clk_hw->ops = ops;
50 memcpy(&clk_hw->enable_reg, reg, sizeof(*reg));
51 clk_hw->enable_bit = bit_idx;
52
53 init.name = name;
54 init.ops = &ti_interface_clk_ops;
55 init.flags = 0;
56
57 init.num_parents = 1;
58 init.parent_names = &parent_name;
59
60 clk = ti_clk_register(NULL, &clk_hw->hw, name);
61
62 if (IS_ERR(clk))
63 kfree(clk_hw);
64 else
65 omap2_init_clk_hw_omap_clocks(&clk_hw->hw);
66
67 return clk;
68 }
69
70 #if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_ATAGS)
ti_clk_register_interface(struct ti_clk * setup)71 struct clk *ti_clk_register_interface(struct ti_clk *setup)
72 {
73 const struct clk_hw_omap_ops *ops = &clkhwops_iclk_wait;
74 struct clk_omap_reg reg;
75 struct ti_clk_gate *gate;
76
77 gate = setup->data;
78 reg.index = gate->module;
79 reg.offset = gate->reg;
80 reg.ptr = NULL;
81
82 if (gate->flags & CLKF_NO_WAIT)
83 ops = &clkhwops_iclk;
84
85 if (gate->flags & CLKF_HSOTGUSB)
86 ops = &clkhwops_omap3430es2_iclk_hsotgusb_wait;
87
88 if (gate->flags & CLKF_DSS)
89 ops = &clkhwops_omap3430es2_iclk_dss_usbhost_wait;
90
91 if (gate->flags & CLKF_SSI)
92 ops = &clkhwops_omap3430es2_iclk_ssi_wait;
93
94 if (gate->flags & CLKF_AM35XX)
95 ops = &clkhwops_am35xx_ipss_wait;
96
97 return _register_interface(NULL, setup->name, gate->parent,
98 ®, gate->bit_shift, ops);
99 }
100 #endif
101
_of_ti_interface_clk_setup(struct device_node * node,const struct clk_hw_omap_ops * ops)102 static void __init _of_ti_interface_clk_setup(struct device_node *node,
103 const struct clk_hw_omap_ops *ops)
104 {
105 struct clk *clk;
106 const char *parent_name;
107 struct clk_omap_reg reg;
108 u8 enable_bit = 0;
109 u32 val;
110
111 if (ti_clk_get_reg_addr(node, 0, ®))
112 return;
113
114 if (!of_property_read_u32(node, "ti,bit-shift", &val))
115 enable_bit = val;
116
117 parent_name = of_clk_get_parent_name(node, 0);
118 if (!parent_name) {
119 pr_err("%s must have a parent\n", node->name);
120 return;
121 }
122
123 clk = _register_interface(NULL, node->name, parent_name, ®,
124 enable_bit, ops);
125
126 if (!IS_ERR(clk))
127 of_clk_add_provider(node, of_clk_src_simple_get, clk);
128 }
129
of_ti_interface_clk_setup(struct device_node * node)130 static void __init of_ti_interface_clk_setup(struct device_node *node)
131 {
132 _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
133 }
134 CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
135 of_ti_interface_clk_setup);
136
of_ti_no_wait_interface_clk_setup(struct device_node * node)137 static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
138 {
139 _of_ti_interface_clk_setup(node, &clkhwops_iclk);
140 }
141 CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
142 of_ti_no_wait_interface_clk_setup);
143
144 #ifdef CONFIG_ARCH_OMAP3
of_ti_hsotgusb_interface_clk_setup(struct device_node * node)145 static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
146 {
147 _of_ti_interface_clk_setup(node,
148 &clkhwops_omap3430es2_iclk_hsotgusb_wait);
149 }
150 CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
151 of_ti_hsotgusb_interface_clk_setup);
152
of_ti_dss_interface_clk_setup(struct device_node * node)153 static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
154 {
155 _of_ti_interface_clk_setup(node,
156 &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
157 }
158 CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
159 of_ti_dss_interface_clk_setup);
160
of_ti_ssi_interface_clk_setup(struct device_node * node)161 static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
162 {
163 _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
164 }
165 CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
166 of_ti_ssi_interface_clk_setup);
167
of_ti_am35xx_interface_clk_setup(struct device_node * node)168 static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
169 {
170 _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
171 }
172 CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
173 of_ti_am35xx_interface_clk_setup);
174 #endif
175
176 #ifdef CONFIG_SOC_OMAP2430
of_ti_omap2430_interface_clk_setup(struct device_node * node)177 static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
178 {
179 _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
180 }
181 CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
182 of_ti_omap2430_interface_clk_setup);
183 #endif
184