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 #include <dt-bindings/clock/dm814.h>
  13
  14 #include "clock.h"
  15
  16 static const struct omap_clkctrl_reg_data dm814_default_clkctrl_regs[] __initconst = {
  17         { DM814_USB_OTG_HS_CLKCTRL, NULL, CLKF_SW_SUP, "pll260dcoclkldo" },
  18         { 0 },
  19 };
  20
  21 static const struct omap_clkctrl_reg_data dm814_alwon_clkctrl_regs[] __initconst = {
  22         { DM814_UART1_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk10_ck" },
  23         { DM814_UART2_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk10_ck" },
  24         { DM814_UART3_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk10_ck" },
  25         { DM814_GPIO1_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk6_ck" },
  26         { DM814_GPIO2_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk6_ck" },
  27         { DM814_I2C1_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk10_ck" },
  28         { DM814_I2C2_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk10_ck" },
  29         { DM814_WD_TIMER_CLKCTRL, NULL, CLKF_SW_SUP | CLKF_NO_IDLEST, "sysclk18_ck" },
  30         { DM814_MCSPI1_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk10_ck" },
  31         { DM814_GPMC_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk6_ck" },
  32         { DM814_CPGMAC0_CLKCTRL, NULL, CLKF_SW_SUP, "cpsw_125mhz_gclk" },
  33         { DM814_MPU_CLKCTRL, NULL, CLKF_SW_SUP, "mpu_ck" },
  34         { DM814_RTC_CLKCTRL, NULL, CLKF_SW_SUP | CLKF_NO_IDLEST, "sysclk18_ck" },
  35         { DM814_TPCC_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk4_ck" },
  36         { DM814_TPTC0_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk4_ck" },
  37         { DM814_TPTC1_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk4_ck" },
  38         { DM814_TPTC2_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk4_ck" },
  39         { DM814_TPTC3_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk4_ck" },
  40         { DM814_MMC1_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk8_ck" },
  41         { DM814_MMC2_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk8_ck" },
  42         { DM814_MMC3_CLKCTRL, NULL, CLKF_SW_SUP, "sysclk8_ck" },
  43         { 0 },
  44 };
  45
  46 const struct omap_clkctrl_data dm814_clkctrl_data[] __initconst = {
  47         { 0x48180500, dm814_default_clkctrl_regs },
  48         { 0x48181400, dm814_alwon_clkctrl_regs },
  49         { 0 },
  50 };
  51
  52 static struct ti_dt_clk dm814_clks[] = {
  53         DT_CLK(NULL, "timer_sys_ck", "devosc_ck"),
  54         { .node_name = NULL },
  55 };
  56
  57 static bool timer_clocks_initialized;
  58
  59 static int __init dm814x_adpll_early_init(void)
  60 {
  61         struct device_node *np;
  62
  63         if (!timer_clocks_initialized)
  64                 return -ENODEV;
  65
  66         np = of_find_node_by_name(NULL, "pllss");
  67         if (!np) {
  68                 pr_err("Could not find node for plls\n");
  69                 return -ENODEV;
  70         }
  71
  72         of_platform_populate(np, NULL, NULL, NULL);
  73
  74         return 0;
  75 }
  76 core_initcall(dm814x_adpll_early_init);
  77
  78 static const char * const init_clocks[] = {
  79         "pll040clkout",         /* MPU 481c5040.adpll.clkout */
  80         "pll290clkout",         /* DDR 481c5290.adpll.clkout */
  81 };
  82
  83 static int __init dm814x_adpll_enable_init_clocks(void)
  84 {
  85         int i, err;
  86
  87         if (!timer_clocks_initialized)
  88                 return -ENODEV;
  89
  90         for (i = 0; i < ARRAY_SIZE(init_clocks); i++) {
  91                 struct clk *clock;
  92
  93                 clock = clk_get(NULL, init_clocks[i]);
  94                 if (WARN(IS_ERR(clock), "could not find init clock %s\n",
  95                          init_clocks[i]))
  96                         continue;
  97                 err = clk_prepare_enable(clock);
  98                 if (WARN(err, "could not enable init clock %s\n",
  99                          init_clocks[i]))
 100                         continue;
 101         }
 102
 103         return 0;
 104 }
 105 postcore_initcall(dm814x_adpll_enable_init_clocks);
 106
 107 int __init dm814x_dt_clk_init(void)
 108 {
 109         ti_dt_clocks_register(dm814_clks);
 110         omap2_clk_disable_autoidle_all();
 111         ti_clk_add_aliases();
 112         omap2_clk_enable_init_clocks(NULL, 0);
 113         timer_clocks_initialized = true;
 114
 115         return 0;
 116 }