LXR linux/arch/arm/mach-omap2/clock34xx.c

   1/*
   2 * OMAP3-specific clock framework functions
   3 *
   4 * Copyright (C) 2007-2008 Texas Instruments, Inc.
   5 * Copyright (C) 2007-2011 Nokia Corporation
   6 *
   7 * Paul Walmsley
   8 * Jouni Högander
   9 *
  10 * Parts of this code are based on code written by
  11 * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu,
  12 * Russell King
  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 "clock.h"
  25#include "clock34xx.h"
  26#include "cm3xxx.h"
  27#include "cm-regbits-34xx.h"
  28
  29/**
  30 * omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI
  31 * @clk: struct clk * being enabled
  32 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
  33 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
  34 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
  35 *
  36 * The OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift
  37 * from the CM_{I,F}CLKEN bit.  Pass back the correct info via
  38 * @idlest_reg and @idlest_bit.  No return value.
  39 */
  40static void omap3430es2_clk_ssi_find_idlest(struct clk_hw_omap *clk,
  41                                            void __iomem **idlest_reg,
  42                                            u8 *idlest_bit,
  43                                            u8 *idlest_val)
  44{
  45        u32 r;
  46
  47        r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
  48        *idlest_reg = (__force void __iomem *)r;
  49        *idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT;
  50        *idlest_val = OMAP34XX_CM_IDLEST_VAL;
  51}
  52const struct clk_hw_omap_ops clkhwops_omap3430es2_ssi_wait = {
  53        .find_idlest    = omap3430es2_clk_ssi_find_idlest,
  54        .find_companion = omap2_clk_dflt_find_companion,
  55};
  56
  57const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_ssi_wait = {
  58        .allow_idle     = omap2_clkt_iclk_allow_idle,
  59        .deny_idle      = omap2_clkt_iclk_deny_idle,
  60        .find_idlest    = omap3430es2_clk_ssi_find_idlest,
  61        .find_companion = omap2_clk_dflt_find_companion,
  62};
  63
  64/**
  65 * omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
  66 * @clk: struct clk * being enabled
  67 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
  68 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
  69 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
  70 *
  71 * Some OMAP modules on OMAP3 ES2+ chips have both initiator and
  72 * target IDLEST bits.  For our purposes, we are concerned with the
  73 * target IDLEST bits, which exist at a different bit position than
  74 * the *CLKEN bit position for these modules (DSS and USBHOST) (The
  75 * default find_idlest code assumes that they are at the same
  76 * position.)  No return value.
  77 */
  78static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk_hw_omap *clk,
  79                                                    void __iomem **idlest_reg,
  80                                                    u8 *idlest_bit,
  81                                                    u8 *idlest_val)
  82{
  83        u32 r;
  84
  85        r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
  86        *idlest_reg = (__force void __iomem *)r;
  87        /* USBHOST_IDLE has same shift */
  88        *idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
  89        *idlest_val = OMAP34XX_CM_IDLEST_VAL;
  90}
  91
  92const struct clk_hw_omap_ops clkhwops_omap3430es2_dss_usbhost_wait = {
  93        .find_idlest    = omap3430es2_clk_dss_usbhost_find_idlest,
  94        .find_companion = omap2_clk_dflt_find_companion,
  95};
  96
  97const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_dss_usbhost_wait = {
  98        .allow_idle     = omap2_clkt_iclk_allow_idle,
  99        .deny_idle      = omap2_clkt_iclk_deny_idle,
 100        .find_idlest    = omap3430es2_clk_dss_usbhost_find_idlest,
 101        .find_companion = omap2_clk_dflt_find_companion,
 102};
 103
 104/**
 105 * omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
 106 * @clk: struct clk * being enabled
 107 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
 108 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
 109 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
 110 *
 111 * The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
 112 * shift from the CM_{I,F}CLKEN bit.  Pass back the correct info via
 113 * @idlest_reg and @idlest_bit.  No return value.
 114 */
 115static void omap3430es2_clk_hsotgusb_find_idlest(struct clk_hw_omap *clk,
 116                                                 void __iomem **idlest_reg,
 117                                                 u8 *idlest_bit,
 118                                                 u8 *idlest_val)
 119{
 120        u32 r;
 121
 122        r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
 123        *idlest_reg = (__force void __iomem *)r;
 124        *idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
 125        *idlest_val = OMAP34XX_CM_IDLEST_VAL;
 126}
 127
 128const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_hsotgusb_wait = {
 129        .allow_idle     = omap2_clkt_iclk_allow_idle,
 130        .deny_idle      = omap2_clkt_iclk_deny_idle,
 131        .find_idlest    = omap3430es2_clk_hsotgusb_find_idlest,
 132        .find_companion = omap2_clk_dflt_find_companion,
 133};
 134
 135const struct clk_hw_omap_ops clkhwops_omap3430es2_hsotgusb_wait = {
 136        .find_idlest    = omap3430es2_clk_hsotgusb_find_idlest,
 137        .find_companion = omap2_clk_dflt_find_companion,
 138};
 139