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clock34xx.c

/*
 * OMAP3-specific clock framework functions
 *
 * Copyright (C) 2007-2008 Texas Instruments, Inc.
 * Copyright (C) 2007-2010 Nokia Corporation
 *
 * Paul Walmsley
 * Jouni Högander
 *
 * Parts of this code are based on code written by
 * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu,
 * Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/io.h>

#include <plat/clock.h>

#include "clock.h"
#include "clock34xx.h"
#include "cm2xxx_3xxx.h"
#include "cm-regbits-34xx.h"

/**
 * omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI
 * @clk: struct clk * being enabled
 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
 *
 * The OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift
 * from the CM_{I,F}CLKEN bit.  Pass back the correct info via
 * @idlest_reg and @idlest_bit.  No return value.
 */
static void omap3430es2_clk_ssi_find_idlest(struct clk *clk,
                                  void __iomem **idlest_reg,
                                  u8 *idlest_bit,
                                  u8 *idlest_val)
{
      u32 r;

      r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
      *idlest_reg = (__force void __iomem *)r;
      *idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT;
      *idlest_val = OMAP34XX_CM_IDLEST_VAL;
}

const struct clkops clkops_omap3430es2_ssi_wait = {
      .enable           = omap2_dflt_clk_enable,
      .disable    = omap2_dflt_clk_disable,
      .find_idlest      = omap3430es2_clk_ssi_find_idlest,
      .find_companion = omap2_clk_dflt_find_companion,
};

/**
 * omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
 * @clk: struct clk * being enabled
 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
 *
 * Some OMAP modules on OMAP3 ES2+ chips have both initiator and
 * target IDLEST bits.  For our purposes, we are concerned with the
 * target IDLEST bits, which exist at a different bit position than
 * the *CLKEN bit position for these modules (DSS and USBHOST) (The
 * default find_idlest code assumes that they are at the same
 * position.)  No return value.
 */
static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk *clk,
                                        void __iomem **idlest_reg,
                                        u8 *idlest_bit,
                                        u8 *idlest_val)
{
      u32 r;

      r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
      *idlest_reg = (__force void __iomem *)r;
      /* USBHOST_IDLE has same shift */
      *idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
      *idlest_val = OMAP34XX_CM_IDLEST_VAL;
}

const struct clkops clkops_omap3430es2_dss_usbhost_wait = {
      .enable           = omap2_dflt_clk_enable,
      .disable    = omap2_dflt_clk_disable,
      .find_idlest      = omap3430es2_clk_dss_usbhost_find_idlest,
      .find_companion = omap2_clk_dflt_find_companion,
};

/**
 * omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
 * @clk: struct clk * being enabled
 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
 *
 * The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
 * shift from the CM_{I,F}CLKEN bit.  Pass back the correct info via
 * @idlest_reg and @idlest_bit.  No return value.
 */
static void omap3430es2_clk_hsotgusb_find_idlest(struct clk *clk,
                                     void __iomem **idlest_reg,
                                     u8 *idlest_bit,
                                     u8 *idlest_val)
{
      u32 r;

      r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
      *idlest_reg = (__force void __iomem *)r;
      *idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
      *idlest_val = OMAP34XX_CM_IDLEST_VAL;
}

const struct clkops clkops_omap3430es2_hsotgusb_wait = {
      .enable           = omap2_dflt_clk_enable,
      .disable    = omap2_dflt_clk_disable,
      .find_idlest      = omap3430es2_clk_hsotgusb_find_idlest,
      .find_companion = omap2_clk_dflt_find_companion,
};

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