arch/arm/mach-nomadik/clock.c

   1 /*
   2  *  linux/arch/arm/mach-nomadik/clock.c
   3  *
   4  *  Copyright (C) 2009 Alessandro Rubini
   5  */
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/errno.h>
   9 #include <linux/clk.h>
  10 #include <asm/clkdev.h>
  11 #include "clock.h"
  12
  13 /*
  14  * The nomadik board uses generic clocks, but the serial pl011 file
  15  * calls clk_enable(), clk_disable(), clk_get_rate(), so we provide them
  16  */
  17 unsigned long clk_get_rate(struct clk *clk)
  18 {
  19         return clk->rate;
  20 }
  21 EXPORT_SYMBOL(clk_get_rate);
  22
  23 /* enable and disable do nothing */
  24 int clk_enable(struct clk *clk)
  25 {
  26         return 0;
  27 }
  28 EXPORT_SYMBOL(clk_enable);
  29
  30 void clk_disable(struct clk *clk)
  31 {
  32 }
  33 EXPORT_SYMBOL(clk_disable);
  34
  35 static struct clk clk_24 = {
  36         .rate = 2400000,
  37 };
  38
  39 static struct clk clk_48 = {
  40         .rate = 48 * 1000 * 1000,
  41 };
  42
  43 /*
  44  * Catch-all default clock to satisfy drivers using the clk API.  We don't
  45  * model the actual hardware clocks yet.
  46  */
  47 static struct clk clk_default;
  48
  49 #define CLK(_clk, dev)                          \
  50         {                                       \
  51                 .clk            = _clk,         \
  52                 .dev_id         = dev,          \
  53         }
  54
  55 static struct clk_lookup lookups[] = {
  56         {
  57                 .con_id         = "apb_pclk",
  58                 .clk            = &clk_default,
  59         },
  60         CLK(&clk_24, "mtu0"),
  61         CLK(&clk_24, "mtu1"),
  62         CLK(&clk_48, "uart0"),
  63         CLK(&clk_48, "uart1"),
  64         CLK(&clk_default, "gpio.0"),
  65         CLK(&clk_default, "gpio.1"),
  66         CLK(&clk_default, "gpio.2"),
  67         CLK(&clk_default, "gpio.3"),
  68         CLK(&clk_default, "rng"),
  69 };
  70
  71 int __init clk_init(void)
  72 {
  73         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
  74         return 0;
  75 }