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Diffstat (limited to 'include/soc/qcom/msm-clock-controller.h')
| -rw-r--r-- | include/soc/qcom/msm-clock-controller.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/include/soc/qcom/msm-clock-controller.h b/include/soc/qcom/msm-clock-controller.h new file mode 100644 index 000000000000..d6bd4e03af0d --- /dev/null +++ b/include/soc/qcom/msm-clock-controller.h @@ -0,0 +1,144 @@ +/* + * Copyright (c) 2014, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#ifndef __ARCH_ARM_MSM_CLOCK_CONTROLLER_H +#define __ARCH_ARM_MSM_CLOCK_CONTROLLER_H + +#include <linux/list.h> +#include <linux/clkdev.h> +#include <linux/of.h> +#include <linux/platform_device.h> + +#define dt_err(np, fmt, ...) \ + pr_err("%s: " fmt, np->name, ##__VA_ARGS__) +#define dt_prop_err(np, str, fmt, ...) \ + dt_err(np, "%s: " fmt, str, ##__VA_ARGS__) + +/** + * struct msmclk_parser + * @compatible + * matches compatible property from devicetree + * @parsedt + * constructs & returns an instance of the appropriate obj based on + * the data from devicetree. + */ +struct msmclk_parser { + struct list_head list; + char *compatible; + void * (*parsedt)(struct device *dev, struct device_node *of); +}; + +#define MSMCLK_PARSER(fn, str, id) \ +static struct msmclk_parser _msmclk_##fn##id = { \ + .list = LIST_HEAD_INIT(_msmclk_##fn##id.list), \ + .compatible = str, \ + .parsedt = fn, \ +}; \ +static int __init _msmclk_init_##fn##id(void) \ +{ \ + msmclk_parser_register(&_msmclk_##fn##id); \ + return 0; \ +} \ +early_initcall(_msmclk_init_##fn##id) + +/* + * struct msmclk_data + * @base + * ioremapped region for sub_devices + * @list + * tracks all registered driver instances + * @htable + * tracks all registered child clocks + * @clk_tbl + * array of clk_lookup to be registered with the clock framework + */ +#define HASHTABLE_SIZE 200 +struct msmclk_data { + void __iomem *base; + struct device *dev; + struct list_head list; + struct hlist_head htable[HASHTABLE_SIZE]; + struct clk_lookup *clk_tbl; + int clk_tbl_size; + int max_clk_tbl_size; +}; + +#if defined(CONFIG_MSM_CLK_CONTROLLER_V2) + +/* Utility functions */ +int of_property_count_phandles(struct device_node *np, char *propname); +int of_property_read_phandle_index(struct device_node *np, char *propname, + int index, phandle *p); +void *msmclk_generic_clk_init(struct device *dev, struct device_node *np, + struct clk *c); + +/* + * msmclk_parser_register + * Registers a parser which will be matched with a node from dt + * according to the compatible string. + */ +void msmclk_parser_register(struct msmclk_parser *); + +/* + * msmclk_parse_phandle + * On hashtable miss, the corresponding entry will be retrieved from + * devicetree, and added to the hashtable. + */ +void *msmclk_parse_phandle(struct device *dev, phandle key); +/* + * msmclk_lookup_phandle + * Straightforward hashtable lookup + */ +void *msmclk_lookup_phandle(struct device *dev, phandle key); + +int __init msmclk_init(void); +#else + +static inline int of_property_count_phandles(struct device_node *np, + char *propname) +{ + return 0; +} + +static inline int of_property_read_phandle_index(struct device_node *np, + char *propname, int index, phandle *p) +{ + return 0; +} + +static inline void *msmclk_generic_clk_init(struct device *dev, + struct device_node *np, struct clk *c) +{ + return ERR_PTR(-EINVAL); +} + +static inline void msmclk_parser_register(struct msmclk_parser *p) {}; + +static inline void *msmclk_parse_phandle(struct device *dev, phandle key) +{ + return ERR_PTR(-EINVAL); +} + +static inline void *msmclk_lookup_phandle(struct device *dev, phandle key) +{ + return ERR_PTR(-EINVAL); +} + +static inline int __init msmclk_init(void) +{ + return 0; +} + +#endif /* CONFIG_MSM_CLK_CONTROLLER_V2 */ +#endif /* __ARCH_ARM_MSM_CLOCK_CONTROLLER_H */ |