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
  15 static 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
  32 static bool timer_clocks_initialized;
  33
  34 static 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 }
  51 core_initcall(dm814x_adpll_early_init);
  52
  53 static const char * const init_clocks[] = {
  54         "pll040clkout",         /* MPU 481c5040.adpll.clkout */
  55         "pll290clkout",         /* DDR 481c5290.adpll.clkout */
  56 };
  57
  58 static 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 }
  80 postcore_initcall(dm814x_adpll_enable_init_clocks);
  81
  82 int __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 }