145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/*
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* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef __ARCH_ARM_MSM_CLOCK_CONTROLLER_H
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#define __ARCH_ARM_MSM_CLOCK_CONTROLLER_H
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#include <linux/list.h>
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#include <linux/clkdev.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#define dt_err(np, fmt, ...) \
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pr_err("%s: " fmt, np->name, ##__VA_ARGS__)
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#define dt_prop_err(np, str, fmt, ...) \
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dt_err(np, "%s: " fmt, str, ##__VA_ARGS__)
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/**
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* struct msmclk_parser
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* @compatible
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* matches compatible property from devicetree
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* @parsedt
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* constructs & returns an instance of the appropriate obj based on
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* the data from devicetree.
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*/
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struct msmclk_parser {
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struct list_head list;
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char *compatible;
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void * (*parsedt)(struct device *dev, struct device_node *of);
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};
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#define MSMCLK_PARSER(fn, str, id) \
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static struct msmclk_parser _msmclk_##fn##id = { \
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.list = LIST_HEAD_INIT(_msmclk_##fn##id.list), \
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.compatible = str, \
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.parsedt = fn, \
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}; \
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static int __init _msmclk_init_##fn##id(void) \
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{ \
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msmclk_parser_register(&_msmclk_##fn##id); \
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return 0; \
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} \
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early_initcall(_msmclk_init_##fn##id)
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/*
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* struct msmclk_data
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* @base
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* ioremapped region for sub_devices
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* @list
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* tracks all registered driver instances
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* @htable
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* tracks all registered child clocks
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* @clk_tbl
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* array of clk_lookup to be registered with the clock framework
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*/
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#define HASHTABLE_SIZE 200
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struct msmclk_data {
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void __iomem *base;
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struct device *dev;
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struct list_head list;
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struct hlist_head htable[HASHTABLE_SIZE];
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struct clk_lookup *clk_tbl;
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int clk_tbl_size;
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int max_clk_tbl_size;
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};
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#if defined(CONFIG_MSM_CLK_CONTROLLER_V2)
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/* Utility functions */
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int of_property_count_phandles(struct device_node *np, char *propname);
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int of_property_read_phandle_index(struct device_node *np, char *propname,
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int index, phandle *p);
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void *msmclk_generic_clk_init(struct device *dev, struct device_node *np,
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struct clk *c);
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/*
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* msmclk_parser_register
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* Registers a parser which will be matched with a node from dt
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* according to the compatible string.
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*/
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void msmclk_parser_register(struct msmclk_parser *);
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/*
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* msmclk_parse_phandle
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* On hashtable miss, the corresponding entry will be retrieved from
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* devicetree, and added to the hashtable.
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*/
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void *msmclk_parse_phandle(struct device *dev, phandle key);
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/*
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* msmclk_lookup_phandle
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* Straightforward hashtable lookup
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*/
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void *msmclk_lookup_phandle(struct device *dev, phandle key);
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int __init msmclk_init(void);
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#else
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static inline int of_property_count_phandles(struct device_node *np,
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char *propname)
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{
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return 0;
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}
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static inline int of_property_read_phandle_index(struct device_node *np,
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char *propname, int index, phandle *p)
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{
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return 0;
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}
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static inline void *msmclk_generic_clk_init(struct device *dev,
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struct device_node *np, struct clk *c)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline void msmclk_parser_register(struct msmclk_parser *p) {};
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static inline void *msmclk_parse_phandle(struct device *dev, phandle key)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline void *msmclk_lookup_phandle(struct device *dev, phandle key)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline int __init msmclk_init(void)
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{
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return 0;
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}
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#endif /* CONFIG_MSM_CLK_CONTROLLER_V2 */
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#endif /* __ARCH_ARM_MSM_CLOCK_CONTROLLER_H */
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