arch/arm/mach-pxa/clock-pxa2xx.c

   1 /*
   2  * linux/arch/arm/mach-pxa/clock-pxa2xx.c
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/sysdev.h>
  13
  14 #include <mach/pxa2xx-regs.h>
  15
  16 #include "clock.h"
  17
  18 void clk_pxa2xx_cken_enable(struct clk *clk)
  19 {
  20         CKEN |= 1 << clk->cken;
  21 }
  22
  23 void clk_pxa2xx_cken_disable(struct clk *clk)
  24 {
  25         CKEN &= ~(1 << clk->cken);
  26 }
  27
  28 const struct clkops clk_pxa2xx_cken_ops = {
  29         .enable         = clk_pxa2xx_cken_enable,
  30         .disable        = clk_pxa2xx_cken_disable,
  31 };
  32
  33 #ifdef CONFIG_PM
  34 static uint32_t saved_cken;
  35
  36 static int pxa2xx_clock_suspend(struct sys_device *d, pm_message_t state)
  37 {
  38         saved_cken = CKEN;
  39         return 0;
  40 }
  41
  42 static int pxa2xx_clock_resume(struct sys_device *d)
  43 {
  44         CKEN = saved_cken;
  45         return 0;
  46 }
  47 #else
  48 #define pxa2xx_clock_suspend    NULL
  49 #define pxa2xx_clock_resume     NULL
  50 #endif
  51
  52 struct sysdev_class pxa2xx_clock_sysclass = {
  53         .name           = "pxa2xx-clock",
  54         .suspend        = pxa2xx_clock_suspend,
  55         .resume         = pxa2xx_clock_resume,
  56 };
  57
  58 static int __init pxa2xx_clock_init(void)
  59 {
  60         if (cpu_is_pxa2xx())
  61                 return sysdev_class_register(&pxa2xx_clock_sysclass);
  62         return 0;
  63 }
  64 postcore_initcall(pxa2xx_clock_init);