arch/arm/mach-omap2/prm44xx.c

   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 }