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 <plat/clock.h> 18 19 #include "clock.h" 20 #include "cm2xxx_3xxx.h" 21 #include "cm-regbits-24xx.h" 22 23 /* Private functions */ 24 25 /** 26 * _allow_idle - enable DPLL autoidle bits 27 * @clk: struct clk * of the DPLL to operate on 28 * 29 * Enable DPLL automatic idle control. The DPLL will enter low-power 30 * stop when its downstream clocks are gated. No return value. 31 * REVISIT: DPLL can optionally enter low-power bypass by writing 0x1 32 * instead. Add some mechanism to optionally enter this mode. 33 */ _allow_idle(struct clk * clk)34static void _allow_idle(struct clk *clk) 35 { 36 if (!clk || !clk->dpll_data) 37 return; 38 39 omap2xxx_cm_set_dpll_auto_low_power_stop(); 40 } 41 42 /** 43 * _deny_idle - prevent DPLL from automatically idling 44 * @clk: struct clk * of the DPLL to operate on 45 * 46 * Disable DPLL automatic idle control. No return value. 47 */ _deny_idle(struct clk * clk)48static void _deny_idle(struct clk *clk) 49 { 50 if (!clk || !clk->dpll_data) 51 return; 52 53 omap2xxx_cm_set_dpll_disable_autoidle(); 54 } 55 56 57 /* Public data */ 58 59 const struct clkops clkops_omap2xxx_dpll_ops = { 60 .allow_idle = _allow_idle, 61 .deny_idle = _deny_idle, 62 }; 63 64