arch/arm/mach-omap2/clkt_iclk.c

   1 /*
   2  * OMAP2/3 interface clock control
   3  *
   4  * Copyright (C) 2011 Nokia Corporation
   5  * Paul Walmsley
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #undef DEBUG
  12
  13 #include <linux/kernel.h>
  14 #include <linux/clk.h>
  15 #include <linux/io.h>
  16
  17 #include <plat/clock.h>
  18 #include <plat/prcm.h>
  19
  20 #include "clock.h"
  21 #include "clock2xxx.h"
  22 #include "cm2xxx_3xxx.h"
  23 #include "cm-regbits-24xx.h"
  24
  25 /* Private functions */
  26
  27 /* XXX */
  28 void omap2_clkt_iclk_allow_idle(struct clk *clk)
  29 {
  30         u32 v, r;
  31
  32         r = ((__force u32)clk->enable_reg ^ (CM_AUTOIDLE ^ CM_ICLKEN));
  33
  34         v = __raw_readl((__force void __iomem *)r);
  35         v |= (1 << clk->enable_bit);
  36         __raw_writel(v, (__force void __iomem *)r);
  37 }
  38
  39 /* XXX */
  40 void omap2_clkt_iclk_deny_idle(struct clk *clk)
  41 {
  42         u32 v, r;
  43
  44         r = ((__force u32)clk->enable_reg ^ (CM_AUTOIDLE ^ CM_ICLKEN));
  45
  46         v = __raw_readl((__force void __iomem *)r);
  47         v &= ~(1 << clk->enable_bit);
  48         __raw_writel(v, (__force void __iomem *)r);
  49 }
  50
  51 /* Public data */
  52
  53 const struct clkops clkops_omap2_iclk_dflt_wait = {
  54         .enable         = omap2_dflt_clk_enable,
  55         .disable        = omap2_dflt_clk_disable,
  56         .find_companion = omap2_clk_dflt_find_companion,
  57         .find_idlest    = omap2_clk_dflt_find_idlest,
  58         .allow_idle     = omap2_clkt_iclk_allow_idle,
  59         .deny_idle      = omap2_clkt_iclk_deny_idle,
  60 };
  61
  62 const struct clkops clkops_omap2_iclk_dflt = {
  63         .enable         = omap2_dflt_clk_enable,
  64         .disable        = omap2_dflt_clk_disable,
  65         .allow_idle     = omap2_clkt_iclk_allow_idle,
  66         .deny_idle      = omap2_clkt_iclk_deny_idle,
  67 };
  68
  69 const struct clkops clkops_omap2_iclk_idle_only = {
  70         .allow_idle     = omap2_clkt_iclk_allow_idle,
  71         .deny_idle      = omap2_clkt_iclk_deny_idle,
  72 };
  73
  74 const struct clkops clkops_omap2_mdmclk_dflt_wait = {
  75         .enable         = omap2_dflt_clk_enable,
  76         .disable        = omap2_dflt_clk_disable,
  77         .find_companion = omap2_clk_dflt_find_companion,
  78         .find_idlest    = omap2_clk_dflt_find_idlest,
  79         .allow_idle     = omap2_clkt_iclk_allow_idle,
  80         .deny_idle      = omap2_clkt_iclk_deny_idle,
  81 };
  82