LXR linux/drivers/clk/ti/clk-814x.c

   1/*
   2 * This program is free software; you can redistribute it and/or
   3 * modify it under the terms of the GNU General Public License as
   4 * published by the Free Software Foundation version 2.
   5 */
   6
   7#include <linux/kernel.h>
   8#include <linux/clk.h>
   9#include <linux/clk-provider.h>
  10#include <linux/clk/ti.h>
  11#include <linux/of_platform.h>
  12
  13#include "clock.h"
  14
  15static struct ti_dt_clk dm814_clks[] = {
  16        DT_CLK(NULL, "devosc_ck", "devosc_ck"),
  17        DT_CLK(NULL, "mpu_ck", "mpu_ck"),
  18        DT_CLK(NULL, "sysclk4_ck", "sysclk4_ck"),
  19        DT_CLK(NULL, "sysclk5_ck", "sysclk5_ck"),
  20        DT_CLK(NULL, "sysclk6_ck", "sysclk6_ck"),
  21        DT_CLK(NULL, "sysclk8_ck", "sysclk8_ck"),
  22        DT_CLK(NULL, "sysclk10_ck", "sysclk10_ck"),
  23        DT_CLK(NULL, "sysclk18_ck", "sysclk18_ck"),
  24        DT_CLK(NULL, "timer_sys_ck", "devosc_ck"),
  25        DT_CLK(NULL, "timer1_fck", "timer1_fck"),
  26        DT_CLK(NULL, "timer2_fck", "timer2_fck"),
  27        DT_CLK(NULL, "cpsw_125mhz_gclk", "cpsw_125mhz_gclk"),
  28        DT_CLK(NULL, "cpsw_cpts_rft_clk", "cpsw_cpts_rft_clk"),
  29        { .node_name = NULL },
  30};
  31
  32static bool timer_clocks_initialized;
  33
  34static int __init dm814x_adpll_early_init(void)
  35{
  36        struct device_node *np;
  37
  38        if (!timer_clocks_initialized)
  39                return -ENODEV;
  40
  41        np = of_find_node_by_name(NULL, "pllss");
  42        if (!np) {
  43                pr_err("Could not find node for plls\n");
  44                return -ENODEV;
  45        }
  46
  47        of_platform_populate(np, NULL, NULL, NULL);
  48
  49        return 0;
  50}
  51core_initcall(dm814x_adpll_early_init);
  52
  53static const char * const init_clocks[] = {
  54        "pll040clkout",         /* MPU 481c5040.adpll.clkout */
  55        "pll290clkout",         /* DDR 481c5290.adpll.clkout */
  56};
  57
  58static int __init dm814x_adpll_enable_init_clocks(void)
  59{
  60        int i, err;
  61
  62        if (!timer_clocks_initialized)
  63                return -ENODEV;
  64
  65        for (i = 0; i < ARRAY_SIZE(init_clocks); i++) {
  66                struct clk *clock;
  67
  68                clock = clk_get(NULL, init_clocks[i]);
  69                if (WARN(IS_ERR(clock), "could not find init clock %s\n",
  70                         init_clocks[i]))
  71                        continue;
  72                err = clk_prepare_enable(clock);
  73                if (WARN(err, "could not enable init clock %s\n",
  74                         init_clocks[i]))
  75                        continue;
  76        }
  77
  78        return 0;
  79}
  80postcore_initcall(dm814x_adpll_enable_init_clocks);
  81
  82int __init dm814x_dt_clk_init(void)
  83{
  84        ti_dt_clocks_register(dm814_clks);
  85        omap2_clk_disable_autoidle_all();
  86        omap2_clk_enable_init_clocks(NULL, 0);
  87        timer_clocks_initialized = true;
  88
  89        return 0;
  90}
  91