release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-omap2/clock2430.c

   1 /*
   2  * clock2430.c - OMAP2430-specific clock integration code
   3  *
   4  * Copyright (C) 2005-2008 Texas Instruments, Inc.
   5  * Copyright (C) 2004-2010 Nokia Corporation
   6  *
   7  * Contacts:
   8  * Richard Woodruff <r-woodruff2@ti.com>
   9  * Paul Walmsley
  10  *
  11  * Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
  12  * Gordon McNutt and RidgeRun, Inc.
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18 #undef DEBUG
  19
  20 #include <linux/kernel.h>
  21 #include <linux/clk.h>
  22 #include <linux/io.h>
  23
  24 #include <plat/clock.h>
  25
  26 #include "clock.h"
  27 #include "clock2xxx.h"
  28 #include "cm.h"
  29 #include "cm-regbits-24xx.h"
  30
  31 /**
  32  * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
  33  * @clk: struct clk * being enabled
  34  * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
  35  * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
  36  * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
  37  *
  38  * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
  39  * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE.  This custom function
  40  * passes back the correct CM_IDLEST register address for I2CHS
  41  * modules.  No return value.
  42  */
  43 static void omap2430_clk_i2chs_find_idlest(struct clk *clk,
  44                                            void __iomem **idlest_reg,
  45                                            u8 *idlest_bit,
  46                                            u8 *idlest_val)
  47 {
  48         *idlest_reg = OMAP2430_CM_REGADDR(CORE_MOD, CM_IDLEST);
  49         *idlest_bit = clk->enable_bit;
  50         *idlest_val = OMAP24XX_CM_IDLEST_VAL;
  51 }
  52
  53 /* 2430 I2CHS has non-standard IDLEST register */
  54 const struct clkops clkops_omap2430_i2chs_wait = {
  55         .enable         = omap2_dflt_clk_enable,
  56         .disable        = omap2_dflt_clk_disable,
  57         .find_idlest    = omap2430_clk_i2chs_find_idlest,
  58         .find_companion = omap2_clk_dflt_find_companion,
  59 };