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  */
  40 static 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 }
  52 const 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
  57 const 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  */
  78 static 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
  92 const 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
  97 const 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  */
 115 static 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
 128 const 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
 135 const 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 };