target/linux/ramips/patches-3.8/0005-MIPS-ralink-adds-clkdev-code.patch

   1 From 3f0a06b0368d25608841843e9d65a7289ad9f14a Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Sun, 20 Jan 2013 22:01:29 +0100
   4 Subject: [PATCH 05/14] MIPS: ralink: adds clkdev code
   5
   6 These SoCs have a limited number of fixed rate clocks. Add support for the
   7 clk and clkdev api.
   8
   9 Signed-off-by: John Crispin <blogic@openwrt.org>
  10 Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  11 Patchwork: http://patchwork.linux-mips.org/patch/4894/
  12 ---
  13  arch/mips/ralink/clk.c |   72 ++++++++++++++++++++++++++++++++++++++++++++++++
  14  1 file changed, 72 insertions(+)
  15  create mode 100644 arch/mips/ralink/clk.c
  16
  17 diff --git a/arch/mips/ralink/clk.c b/arch/mips/ralink/clk.c
  18 new file mode 100644
  19 index 0000000..8dfa22f
  20 --- /dev/null
  21 +++ b/arch/mips/ralink/clk.c
  22 @@ -0,0 +1,72 @@
  23 +/*
  24 + *  This program is free software; you can redistribute it and/or modify it
  25 + *  under the terms of the GNU General Public License version 2 as published
  26 + *  by the Free Software Foundation.
  27 + *
  28 + *  Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
  29 + *  Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  30 + */
  31 +
  32 +#include <linux/kernel.h>
  33 +#include <linux/module.h>
  34 +#include <linux/clkdev.h>
  35 +#include <linux/clk.h>
  36 +
  37 +#include <asm/time.h>
  38 +
  39 +#include "common.h"
  40 +
  41 +struct clk {
  42 +       struct clk_lookup cl;
  43 +       unsigned long rate;
  44 +};
  45 +
  46 +void ralink_clk_add(const char *dev, unsigned long rate)
  47 +{
  48 +       struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
  49 +
  50 +       if (!clk)
  51 +               panic("failed to add clock\n");
  52 +
  53 +       clk->cl.dev_id = dev;
  54 +       clk->cl.clk = clk;
  55 +
  56 +       clk->rate = rate;
  57 +
  58 +       clkdev_add(&clk->cl);
  59 +}
  60 +
  61 +/*
  62 + * Linux clock API
  63 + */
  64 +int clk_enable(struct clk *clk)
  65 +{
  66 +       return 0;
  67 +}
  68 +EXPORT_SYMBOL_GPL(clk_enable);
  69 +
  70 +void clk_disable(struct clk *clk)
  71 +{
  72 +}
  73 +EXPORT_SYMBOL_GPL(clk_disable);
  74 +
  75 +unsigned long clk_get_rate(struct clk *clk)
  76 +{
  77 +       return clk->rate;
  78 +}
  79 +EXPORT_SYMBOL_GPL(clk_get_rate);
  80 +
  81 +void __init plat_time_init(void)
  82 +{
  83 +       struct clk *clk;
  84 +
  85 +       ralink_of_remap();
  86 +
  87 +       ralink_clk_init();
  88 +       clk = clk_get_sys("cpu", NULL);
  89 +       if (IS_ERR(clk))
  90 +               panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
  91 +       pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
  92 +       mips_hpt_frequency = clk_get_rate(clk) / 2;
  93 +       clk_put(clk);
  94 +}
  95 --
  96 1.7.10.4
  97