arch/arm/mach-ux500/clock.c

   1 /*
   2  *  Copyright (C) 2009 ST-Ericsson
   3  *      heavily based on realview platform
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/list.h>
  12 #include <linux/errno.h>
  13 #include <linux/err.h>
  14 #include <linux/clk.h>
  15 #include <linux/mutex.h>
  16
  17 #include <asm/clkdev.h>
  18
  19 /* currently the clk structure
  20  * just supports rate. This would
  21  * be extended as and when new devices are
  22  * added - TODO
  23  */
  24 struct clk {
  25         unsigned long           rate;
  26 };
  27
  28 int clk_enable(struct clk *clk)
  29 {
  30         return 0;
  31 }
  32 EXPORT_SYMBOL(clk_enable);
  33
  34 void clk_disable(struct clk *clk)
  35 {
  36 }
  37 EXPORT_SYMBOL(clk_disable);
  38
  39 unsigned long clk_get_rate(struct clk *clk)
  40 {
  41         return clk->rate;
  42 }
  43 EXPORT_SYMBOL(clk_get_rate);
  44
  45 long clk_round_rate(struct clk *clk, unsigned long rate)
  46 {
  47         /*TODO*/
  48         return rate;
  49 }
  50 EXPORT_SYMBOL(clk_round_rate);
  51
  52 int clk_set_rate(struct clk *clk, unsigned long rate)
  53 {
  54         clk->rate = rate;
  55         return 0;
  56 }
  57 EXPORT_SYMBOL(clk_set_rate);
  58
  59 /* ssp clock */
  60 static struct clk ssp_clk = {
  61         .rate = 48000000,
  62 };
  63
  64 /* fixed clock */
  65 static struct clk f38_clk = {
  66         .rate = 38400000,
  67 };
  68
  69 static struct clk_lookup lookups[] = {
  70         {
  71                 /* UART0 */
  72                 .dev_id         = "uart0",
  73                 .clk            = &f38_clk,
  74         }, {    /* UART1 */
  75                 .dev_id         = "uart1",
  76                 .clk            = &f38_clk,
  77         }, {    /* UART2 */
  78                 .dev_id         = "uart2",
  79                 .clk            = &f38_clk,
  80         }, {    /* SSP */
  81                 .dev_id         = "pl022",
  82                 .clk            = &ssp_clk,
  83         }
  84 };
  85
  86 static int __init clk_init(void)
  87 {
  88         /* register the clock lookups */
  89         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
  90         return 0;
  91 }
  92 arch_initcall(clk_init);