1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * OMAP interface clock support
  4 *
  5 * Copyright (C) 2013 Texas Instruments, Inc.
  6 *
  7 * Tero Kristo <t-kristo@ti.com>
  8 */
  9
 10#include <linux/clk-provider.h>
 11#include <linux/slab.h>
 12#include <linux/of.h>
 13#include <linux/of_address.h>
 14#include <linux/clk/ti.h>
 15#include "clock.h"
 16
 17#undef pr_fmt
 18#define pr_fmt(fmt) "%s: " fmt, __func__
 19
 20static const struct clk_ops ti_interface_clk_ops = {
 21	.init		= &omap2_init_clk_clkdm,
 22	.enable		= &omap2_dflt_clk_enable,
 23	.disable	= &omap2_dflt_clk_disable,
 24	.is_enabled	= &omap2_dflt_clk_is_enabled,
 25};
 26
 27static struct clk *_register_interface(struct device_node *node,
 28				       const char *name,
 29				       const char *parent_name,
 30				       struct clk_omap_reg *reg, u8 bit_idx,
 31				       const struct clk_hw_omap_ops *ops)
 32{
 33	struct clk_init_data init = { NULL };
 34	struct clk_hw_omap *clk_hw;
 35	struct clk *clk;
 36
 37	clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
 38	if (!clk_hw)
 39		return ERR_PTR(-ENOMEM);
 40
 41	clk_hw->hw.init = &init;
 42	clk_hw->ops = ops;
 43	memcpy(&clk_hw->enable_reg, reg, sizeof(*reg));
 44	clk_hw->enable_bit = bit_idx;
 45
 46	init.name = name;
 47	init.ops = &ti_interface_clk_ops;
 48	init.flags = 0;
 49
 50	init.num_parents = 1;
 51	init.parent_names = &parent_name;
 52
 53	clk = of_ti_clk_register_omap_hw(node, &clk_hw->hw, name);
 54
 55	if (IS_ERR(clk))
 56		kfree(clk_hw);
 57
 58	return clk;
 59}
 60
 61static void __init _of_ti_interface_clk_setup(struct device_node *node,
 62					      const struct clk_hw_omap_ops *ops)
 63{
 64	struct clk *clk;
 65	const char *parent_name;
 66	struct clk_omap_reg reg;
 67	u8 enable_bit = 0;
 68	const char *name;
 69	u32 val;
 70
 71	if (ti_clk_get_reg_addr(node, 0, &reg))
 72		return;
 73
 74	if (!of_property_read_u32(node, "ti,bit-shift", &val))
 75		enable_bit = val;
 76
 77	parent_name = of_clk_get_parent_name(node, 0);
 78	if (!parent_name) {
 79		pr_err("%pOFn must have a parent\n", node);
 80		return;
 81	}
 82
 83	name = ti_dt_clk_name(node);
 84	clk = _register_interface(node, name, parent_name, &reg,
 85				  enable_bit, ops);
 86
 87	if (!IS_ERR(clk))
 88		of_clk_add_provider(node, of_clk_src_simple_get, clk);
 89}
 90
 91static void __init of_ti_interface_clk_setup(struct device_node *node)
 92{
 93	_of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
 94}
 95CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
 96	       of_ti_interface_clk_setup);
 97
 98static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
 99{
100	_of_ti_interface_clk_setup(node, &clkhwops_iclk);
101}
102CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
103	       of_ti_no_wait_interface_clk_setup);
104
105#ifdef CONFIG_ARCH_OMAP3
106static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
107{
108	_of_ti_interface_clk_setup(node,
109				   &clkhwops_omap3430es2_iclk_hsotgusb_wait);
110}
111CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
112	       of_ti_hsotgusb_interface_clk_setup);
113
114static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
115{
116	_of_ti_interface_clk_setup(node,
117				   &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
118}
119CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
120	       of_ti_dss_interface_clk_setup);
121
122static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
123{
124	_of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
125}
126CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
127	       of_ti_ssi_interface_clk_setup);
128
129static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
130{
131	_of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
132}
133CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
134	       of_ti_am35xx_interface_clk_setup);
135#endif
136
137#ifdef CONFIG_SOC_OMAP2430
138static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
139{
140	_of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
141}
142CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
143	       of_ti_omap2430_interface_clk_setup);
144#endif