1 /* 2 * OMAP4 PRM module functions 3 * 4 * Copyright (C) 2011 Texas Instruments, Inc. 5 * Copyright (C) 2010 Nokia Corporation 6 * Benoît Cousson 7 * Paul Walmsley 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/delay.h> 16 #include <linux/errno.h> 17 #include <linux/err.h> 18 #include <linux/io.h> 19 20 #include <plat/common.h> 21 #include <plat/cpu.h> 22 #include <plat/prcm.h> 23 24 #include "prm44xx.h" 25 #include "prm-regbits-44xx.h" 26 27 /* PRM low-level functions */ 28 29 /* Read a register in a CM/PRM instance in the PRM module */ 30 u32 omap4_prm_read_inst_reg(s16 inst, u16 reg) 31 { 32 return __raw_readl(OMAP44XX_PRM_REGADDR(inst, reg)); 33 } 34 35 /* Write into a register in a CM/PRM instance in the PRM module */ 36 void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg) 37 { 38 __raw_writel(val, OMAP44XX_PRM_REGADDR(inst, reg)); 39 } 40 41 /* Read-modify-write a register in a PRM module. Caller must lock */ 42 u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg) 43 { 44 u32 v; 45 46 v = omap4_prm_read_inst_reg(inst, reg); 47 v &= ~mask; 48 v |= bits; 49 omap4_prm_write_inst_reg(v, inst, reg); 50 51 return v; 52 } 53