1 /* 2 * OMAP2-specific DPLL control functions 3 * 4 * Copyright (C) 2011 Nokia Corporation 5 * Paul Walmsley 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/errno.h> 14 #include <linux/clk.h> 15 #include <linux/io.h> 16 17 #include "clock.h" 18 #include "cm2xxx.h" 19 #include "cm-regbits-24xx.h" 20 21 /* Private functions */ 22 23 /** 24 * _allow_idle - enable DPLL autoidle bits 25 * @clk: struct clk * of the DPLL to operate on 26 * 27 * Enable DPLL automatic idle control. The DPLL will enter low-power 28 * stop when its downstream clocks are gated. No return value. 29 * REVISIT: DPLL can optionally enter low-power bypass by writing 0x1 30 * instead. Add some mechanism to optionally enter this mode. 31 */ _allow_idle(struct clk_hw_omap * clk)32static void _allow_idle(struct clk_hw_omap *clk) 33 { 34 if (!clk || !clk->dpll_data) 35 return; 36 37 omap2xxx_cm_set_dpll_auto_low_power_stop(); 38 } 39 40 /** 41 * _deny_idle - prevent DPLL from automatically idling 42 * @clk: struct clk * of the DPLL to operate on 43 * 44 * Disable DPLL automatic idle control. No return value. 45 */ _deny_idle(struct clk_hw_omap * clk)46static void _deny_idle(struct clk_hw_omap *clk) 47 { 48 if (!clk || !clk->dpll_data) 49 return; 50 51 omap2xxx_cm_set_dpll_disable_autoidle(); 52 } 53 54 55 /* Public data */ 56 const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll = { 57 .allow_idle = _allow_idle, 58 .deny_idle = _deny_idle, 59 }; 60