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) 2007-2010 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 <plat/clock.h>
  25
  26 #include "clock.h"
  27 #include "clock34xx.h"
  28 #include "cm2xxx_3xxx.h"
  29 #include "cm-regbits-34xx.h"
  30
  31 /**
  32  * omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI
  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  * The OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift
  39  * from the CM_{I,F}CLKEN bit.  Pass back the correct info via
  40  * @idlest_reg and @idlest_bit.  No return value.
  41  */
  42 static void omap3430es2_clk_ssi_find_idlest(struct clk *clk,
  43                                             void __iomem **idlest_reg,
  44                                             u8 *idlest_bit,
  45                                             u8 *idlest_val)
  46 {
  47         u32 r;
  48
  49         r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
  50         *idlest_reg = (__force void __iomem *)r;
  51         *idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT;
  52         *idlest_val = OMAP34XX_CM_IDLEST_VAL;
  53 }
  54
  55 const struct clkops clkops_omap3430es2_ssi_wait = {
  56         .enable         = omap2_dflt_clk_enable,
  57         .disable        = omap2_dflt_clk_disable,
  58         .find_idlest    = omap3430es2_clk_ssi_find_idlest,
  59         .find_companion = omap2_clk_dflt_find_companion,
  60 };
  61
  62 /**
  63  * omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
  64  * @clk: struct clk * being enabled
  65  * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
  66  * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
  67  * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
  68  *
  69  * Some OMAP modules on OMAP3 ES2+ chips have both initiator and
  70  * target IDLEST bits.  For our purposes, we are concerned with the
  71  * target IDLEST bits, which exist at a different bit position than
  72  * the *CLKEN bit position for these modules (DSS and USBHOST) (The
  73  * default find_idlest code assumes that they are at the same
  74  * position.)  No return value.
  75  */
  76 static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk *clk,
  77                                                     void __iomem **idlest_reg,
  78                                                     u8 *idlest_bit,
  79                                                     u8 *idlest_val)
  80 {
  81         u32 r;
  82
  83         r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
  84         *idlest_reg = (__force void __iomem *)r;
  85         /* USBHOST_IDLE has same shift */
  86         *idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
  87         *idlest_val = OMAP34XX_CM_IDLEST_VAL;
  88 }
  89
  90 const struct clkops clkops_omap3430es2_dss_usbhost_wait = {
  91         .enable         = omap2_dflt_clk_enable,
  92         .disable        = omap2_dflt_clk_disable,
  93         .find_idlest    = omap3430es2_clk_dss_usbhost_find_idlest,
  94         .find_companion = omap2_clk_dflt_find_companion,
  95 };
  96
  97 /**
  98  * omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
  99  * @clk: struct clk * being enabled
 100  * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
 101  * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
 102  * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
 103  *
 104  * The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
 105  * shift from the CM_{I,F}CLKEN bit.  Pass back the correct info via
 106  * @idlest_reg and @idlest_bit.  No return value.
 107  */
 108 static void omap3430es2_clk_hsotgusb_find_idlest(struct clk *clk,
 109                                                  void __iomem **idlest_reg,
 110                                                  u8 *idlest_bit,
 111                                                  u8 *idlest_val)
 112 {
 113         u32 r;
 114
 115         r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
 116         *idlest_reg = (__force void __iomem *)r;
 117         *idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
 118         *idlest_val = OMAP34XX_CM_IDLEST_VAL;
 119 }
 120
 121 const struct clkops clkops_omap3430es2_hsotgusb_wait = {
 122         .enable         = omap2_dflt_clk_enable,
 123         .disable        = omap2_dflt_clk_disable,
 124         .find_idlest    = omap3430es2_clk_hsotgusb_find_idlest,
 125         .find_companion = omap2_clk_dflt_find_companion,
 126 };