1 /* linux/arch/arm/plat-samsung/include/plat/clock-clksrc.h 2 * 3 * Parts taken from arch/arm/plat-s3c64xx/clock.c 4 * Copyright 2008 Openmoko, Inc. 5 * Copyright 2008 Simtec Electronics 6 * Ben Dooks <ben@simtec.co.uk> 7 * http://armlinux.simtec.co.uk/ 8 * 9 * Copyright 2009 Ben Dooks <ben-linux@fluff.org> 10 * Copyright 2009 Harald Welte 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 */ 16 17 /** 18 * struct clksrc_sources - list of sources for a given clock 19 * @sources: array of pointers to clocks 20 * @nr_sources: The size of @sources 21 */ 22 struct clksrc_sources { 23 unsigned int nr_sources; 24 struct clk **sources; 25 }; 26 27 /** 28 * struct clksrc_reg - register definition for clock control bits 29 * @reg: pointer to the register in virtual memory. 30 * @shift: the shift in bits to where the bitfield is. 31 * @size: the size in bits of the bitfield. 32 * 33 * This specifies the size and position of the bits we are interested 34 * in within the register specified by @reg. 35 */ 36 struct clksrc_reg { 37 void __iomem *reg; 38 unsigned short shift; 39 unsigned short size; 40 }; 41 42 /** 43 * struct clksrc_clk - class of clock for newer style samsung devices. 44 * @clk: the standard clock representation 45 * @sources: the sources for this clock 46 * @reg_src: the register definition for selecting the clock's source 47 * @reg_div: the register definition for the clock's output divisor 48 * 49 * This clock implements the features required by the newer SoCs where 50 * the standard clock block provides an input mux and a post-mux divisor 51 * to provide the periperhal's clock. 52 * 53 * The array of @sources provides the mapping of mux position to the 54 * clock, and @reg_src shows the code where to modify to change the mux 55 * position. The @reg_div defines how to change the divider settings on 56 * the output. 57 */ 58 struct clksrc_clk { 59 struct clk clk; 60 struct clksrc_sources *sources; 61 62 struct clksrc_reg reg_src; 63 struct clksrc_reg reg_div; 64 }; 65 66 /** 67 * s3c_set_clksrc() - setup the clock from the register settings 68 * @clk: The clock to setup. 69 * @announce: true to announce the setting to printk(). 70 * 71 * Setup the clock from the current register settings, for when the 72 * kernel boots or if it is resuming from a possibly unknown state. 73 */ 74 extern void s3c_set_clksrc(struct clksrc_clk *clk, bool announce); 75 76 /** 77 * s3c_register_clksrc() register clocks from an array of clksrc clocks 78 * @srcs: The array of clocks to register 79 * @size: The size of the @srcs array. 80 * 81 * Initialise and register the array of clocks described by @srcs. 82 */ 83 extern void s3c_register_clksrc(struct clksrc_clk *srcs, int size); 84