arch/arm/mach-omap2/clkt2xxx_apll.c

   1 /*
   2  * OMAP2xxx APLL clock control functions
   3  *
   4  * Copyright (C) 2005-2008 Texas Instruments, Inc.
   5  * Copyright (C) 2004-2010 Nokia Corporation
   6  *
   7  * Contacts:
   8  * Richard Woodruff <r-woodruff2@ti.com>
   9  * Paul Walmsley
  10  *
  11  * Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
  12  * Gordon McNutt and RidgeRun, Inc.
  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
  25 #include "clock.h"
  26 #include "clock2xxx.h"
  27 #include "cm2xxx.h"
  28 #include "cm-regbits-24xx.h"
  29
  30 /* CM_CLKEN_PLL.EN_{54,96}M_PLL options (24XX) */
  31 #define EN_APLL_STOPPED                 0
  32 #define EN_APLL_LOCKED                  3
  33
  34 /* CM_CLKSEL1_PLL.APLLS_CLKIN options (24XX) */
  35 #define APLLS_CLKIN_19_2MHZ             0
  36 #define APLLS_CLKIN_13MHZ               2
  37 #define APLLS_CLKIN_12MHZ               3
  38
  39 /* Private functions */
  40
  41 static int _apll96_enable(struct clk *clk)
  42 {
  43         return omap2xxx_cm_apll96_enable();
  44 }
  45
  46 static int _apll54_enable(struct clk *clk)
  47 {
  48         return omap2xxx_cm_apll54_enable();
  49 }
  50
  51 static void _apll96_allow_idle(struct clk *clk)
  52 {
  53         omap2xxx_cm_set_apll96_auto_low_power_stop();
  54 }
  55
  56 static void _apll96_deny_idle(struct clk *clk)
  57 {
  58         omap2xxx_cm_set_apll96_disable_autoidle();
  59 }
  60
  61 static void _apll54_allow_idle(struct clk *clk)
  62 {
  63         omap2xxx_cm_set_apll54_auto_low_power_stop();
  64 }
  65
  66 static void _apll54_deny_idle(struct clk *clk)
  67 {
  68         omap2xxx_cm_set_apll54_disable_autoidle();
  69 }
  70
  71 static void _apll96_disable(struct clk *clk)
  72 {
  73         omap2xxx_cm_apll96_disable();
  74 }
  75
  76 static void _apll54_disable(struct clk *clk)
  77 {
  78         omap2xxx_cm_apll54_disable();
  79 }
  80
  81 /* Public data */
  82
  83 const struct clkops clkops_apll96 = {
  84         .enable         = _apll96_enable,
  85         .disable        = _apll96_disable,
  86         .allow_idle     = _apll96_allow_idle,
  87         .deny_idle      = _apll96_deny_idle,
  88 };
  89
  90 const struct clkops clkops_apll54 = {
  91         .enable         = _apll54_enable,
  92         .disable        = _apll54_disable,
  93         .allow_idle     = _apll54_allow_idle,
  94         .deny_idle      = _apll54_deny_idle,
  95 };
  96
  97 /* Public functions */
  98
  99 u32 omap2xxx_get_apll_clkin(void)
 100 {
 101         u32 aplls, srate = 0;
 102
 103         aplls = omap2_cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
 104         aplls &= OMAP24XX_APLLS_CLKIN_MASK;
 105         aplls >>= OMAP24XX_APLLS_CLKIN_SHIFT;
 106
 107         if (aplls == APLLS_CLKIN_19_2MHZ)
 108                 srate = 19200000;
 109         else if (aplls == APLLS_CLKIN_13MHZ)
 110                 srate = 13000000;
 111         else if (aplls == APLLS_CLKIN_12MHZ)
 112                 srate = 12000000;
 113
 114         return srate;
 115 }
 116