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 *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_omap_hw(NULL, &clk_hw->hw, name);
 61
 62	if (IS_ERR(clk))
 63		kfree(clk_hw);
 64
 65	return clk;
 66}
 67
 68static void __init _of_ti_interface_clk_setup(struct device_node *node,
 69					      const struct clk_hw_omap_ops *ops)
 70{
 71	struct clk *clk;
 72	const char *parent_name;
 73	struct clk_omap_reg reg;
 74	u8 enable_bit = 0;
 75	u32 val;
 76
 77	if (ti_clk_get_reg_addr(node, 0, &reg))
 78		return;
 79
 80	if (!of_property_read_u32(node, "ti,bit-shift", &val))
 81		enable_bit = val;
 82
 83	parent_name = of_clk_get_parent_name(node, 0);
 84	if (!parent_name) {
 85		pr_err("%pOFn must have a parent\n", node);
 86		return;
 87	}
 88
 89	clk = _register_interface(NULL, node->name, parent_name, &reg,
 90				  enable_bit, ops);
 91
 92	if (!IS_ERR(clk))
 93		of_clk_add_provider(node, of_clk_src_simple_get, clk);
 94}
 95
 96static void __init of_ti_interface_clk_setup(struct device_node *node)
 97{
 98	_of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
 99}
100CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
101	       of_ti_interface_clk_setup);
102
103static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
104{
105	_of_ti_interface_clk_setup(node, &clkhwops_iclk);
106}
107CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
108	       of_ti_no_wait_interface_clk_setup);
109
110#ifdef CONFIG_ARCH_OMAP3
111static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
112{
113	_of_ti_interface_clk_setup(node,
114				   &clkhwops_omap3430es2_iclk_hsotgusb_wait);
115}
116CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
117	       of_ti_hsotgusb_interface_clk_setup);
118
119static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
120{
121	_of_ti_interface_clk_setup(node,
122				   &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
123}
124CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
125	       of_ti_dss_interface_clk_setup);
126
127static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
128{
129	_of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
130}
131CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
132	       of_ti_ssi_interface_clk_setup);
133
134static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
135{
136	_of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
137}
138CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
139	       of_ti_am35xx_interface_clk_setup);
140#endif
141
142#ifdef CONFIG_SOC_OMAP2430
143static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
144{
145	_of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
146}
147CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
148	       of_ti_omap2430_interface_clk_setup);
149#endif