kernel/drivers/clk/ti/clk-33xx.c

   1 /*
   2  * AM33XX Clock init
   3  *
   4  * Copyright (C) 2013 Texas Instruments, Inc
   5  *     Tero Kristo (t-kristo@ti.com)
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation version 2.
  10  *
  11  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  12  * kind, whether express or implied; without even the implied warranty
  13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/list.h>
  19 #include <linux/clk.h>
  20 #include <linux/clk-provider.h>
  21 #include <linux/clk/ti.h>
  22
  23 #include "clock.h"
  24
  25 static struct ti_dt_clk am33xx_clks[] = {
  26         DT_CLK(NULL, "clk_32768_ck", "clk_32768_ck"),
  27         DT_CLK(NULL, "clk_rc32k_ck", "clk_rc32k_ck"),
  28         DT_CLK(NULL, "virt_19200000_ck", "virt_19200000_ck"),
  29         DT_CLK(NULL, "virt_24000000_ck", "virt_24000000_ck"),
  30         DT_CLK(NULL, "virt_25000000_ck", "virt_25000000_ck"),
  31         DT_CLK(NULL, "virt_26000000_ck", "virt_26000000_ck"),
  32         DT_CLK(NULL, "sys_clkin_ck", "sys_clkin_ck"),
  33         DT_CLK(NULL, "tclkin_ck", "tclkin_ck"),
  34         DT_CLK(NULL, "dpll_core_ck", "dpll_core_ck"),
  35         DT_CLK(NULL, "dpll_core_x2_ck", "dpll_core_x2_ck"),
  36         DT_CLK(NULL, "dpll_core_m4_ck", "dpll_core_m4_ck"),
  37         DT_CLK(NULL, "dpll_core_m5_ck", "dpll_core_m5_ck"),
  38         DT_CLK(NULL, "dpll_core_m6_ck", "dpll_core_m6_ck"),
  39         DT_CLK(NULL, "dpll_mpu_ck", "dpll_mpu_ck"),
  40         DT_CLK(NULL, "dpll_mpu_m2_ck", "dpll_mpu_m2_ck"),
  41         DT_CLK(NULL, "dpll_ddr_ck", "dpll_ddr_ck"),
  42         DT_CLK(NULL, "dpll_ddr_m2_ck", "dpll_ddr_m2_ck"),
  43         DT_CLK(NULL, "dpll_ddr_m2_div2_ck", "dpll_ddr_m2_div2_ck"),
  44         DT_CLK(NULL, "dpll_disp_ck", "dpll_disp_ck"),
  45         DT_CLK(NULL, "dpll_disp_m2_ck", "dpll_disp_m2_ck"),
  46         DT_CLK(NULL, "dpll_per_ck", "dpll_per_ck"),
  47         DT_CLK(NULL, "dpll_per_m2_ck", "dpll_per_m2_ck"),
  48         DT_CLK(NULL, "dpll_per_m2_div4_wkupdm_ck", "dpll_per_m2_div4_wkupdm_ck"),
  49         DT_CLK(NULL, "dpll_per_m2_div4_ck", "dpll_per_m2_div4_ck"),
  50         DT_CLK(NULL, "adc_tsc_fck", "adc_tsc_fck"),
  51         DT_CLK(NULL, "cefuse_fck", "cefuse_fck"),
  52         DT_CLK(NULL, "clkdiv32k_ck", "clkdiv32k_ck"),
  53         DT_CLK(NULL, "clkdiv32k_ick", "clkdiv32k_ick"),
  54         DT_CLK(NULL, "dcan0_fck", "dcan0_fck"),
  55         DT_CLK("481cc000.d_can", NULL, "dcan0_fck"),
  56         DT_CLK(NULL, "dcan1_fck", "dcan1_fck"),
  57         DT_CLK("481d0000.d_can", NULL, "dcan1_fck"),
  58         DT_CLK(NULL, "pruss_ocp_gclk", "pruss_ocp_gclk"),
  59         DT_CLK(NULL, "mcasp0_fck", "mcasp0_fck"),
  60         DT_CLK(NULL, "mcasp1_fck", "mcasp1_fck"),
  61         DT_CLK(NULL, "mmu_fck", "mmu_fck"),
  62         DT_CLK(NULL, "smartreflex0_fck", "smartreflex0_fck"),
  63         DT_CLK(NULL, "smartreflex1_fck", "smartreflex1_fck"),
  64         DT_CLK(NULL, "sha0_fck", "sha0_fck"),
  65         DT_CLK(NULL, "aes0_fck", "aes0_fck"),
  66         DT_CLK(NULL, "rng_fck", "rng_fck"),
  67         DT_CLK(NULL, "timer1_fck", "timer1_fck"),
  68         DT_CLK(NULL, "timer2_fck", "timer2_fck"),
  69         DT_CLK(NULL, "timer3_fck", "timer3_fck"),
  70         DT_CLK(NULL, "timer4_fck", "timer4_fck"),
  71         DT_CLK(NULL, "timer5_fck", "timer5_fck"),
  72         DT_CLK(NULL, "timer6_fck", "timer6_fck"),
  73         DT_CLK(NULL, "timer7_fck", "timer7_fck"),
  74         DT_CLK(NULL, "usbotg_fck", "usbotg_fck"),
  75         DT_CLK(NULL, "ieee5000_fck", "ieee5000_fck"),
  76         DT_CLK(NULL, "wdt1_fck", "wdt1_fck"),
  77         DT_CLK(NULL, "l4_rtc_gclk", "l4_rtc_gclk"),
  78         DT_CLK(NULL, "l3_gclk", "l3_gclk"),
  79         DT_CLK(NULL, "dpll_core_m4_div2_ck", "dpll_core_m4_div2_ck"),
  80         DT_CLK(NULL, "l4hs_gclk", "l4hs_gclk"),
  81         DT_CLK(NULL, "l3s_gclk", "l3s_gclk"),
  82         DT_CLK(NULL, "l4fw_gclk", "l4fw_gclk"),
  83         DT_CLK(NULL, "l4ls_gclk", "l4ls_gclk"),
  84         DT_CLK(NULL, "clk_24mhz", "clk_24mhz"),
  85         DT_CLK(NULL, "sysclk_div_ck", "sysclk_div_ck"),
  86         DT_CLK(NULL, "cpsw_125mhz_gclk", "cpsw_125mhz_gclk"),
  87         DT_CLK(NULL, "cpsw_cpts_rft_clk", "cpsw_cpts_rft_clk"),
  88         DT_CLK(NULL, "gpio0_dbclk_mux_ck", "gpio0_dbclk_mux_ck"),
  89         DT_CLK(NULL, "gpio0_dbclk", "gpio0_dbclk"),
  90         DT_CLK(NULL, "gpio1_dbclk", "gpio1_dbclk"),
  91         DT_CLK(NULL, "gpio2_dbclk", "gpio2_dbclk"),
  92         DT_CLK(NULL, "gpio3_dbclk", "gpio3_dbclk"),
  93         DT_CLK(NULL, "lcd_gclk", "lcd_gclk"),
  94         DT_CLK(NULL, "mmc_clk", "mmc_clk"),
  95         DT_CLK(NULL, "gfx_fclk_clksel_ck", "gfx_fclk_clksel_ck"),
  96         DT_CLK(NULL, "gfx_fck_div_ck", "gfx_fck_div_ck"),
  97         DT_CLK(NULL, "sysclkout_pre_ck", "sysclkout_pre_ck"),
  98         DT_CLK(NULL, "clkout2_div_ck", "clkout2_div_ck"),
  99         DT_CLK(NULL, "timer_32k_ck", "clkdiv32k_ick"),
 100         DT_CLK(NULL, "timer_sys_ck", "sys_clkin_ck"),
 101         DT_CLK(NULL, "dbg_sysclk_ck", "dbg_sysclk_ck"),
 102         DT_CLK(NULL, "dbg_clka_ck", "dbg_clka_ck"),
 103         DT_CLK(NULL, "stm_pmd_clock_mux_ck", "stm_pmd_clock_mux_ck"),
 104         DT_CLK(NULL, "trace_pmd_clk_mux_ck", "trace_pmd_clk_mux_ck"),
 105         DT_CLK(NULL, "stm_clk_div_ck", "stm_clk_div_ck"),
 106         DT_CLK(NULL, "trace_clk_div_ck", "trace_clk_div_ck"),
 107         DT_CLK(NULL, "clkout2_ck", "clkout2_ck"),
 108         DT_CLK("48300200.ehrpwm", "tbclk", "ehrpwm0_tbclk"),
 109         DT_CLK("48302200.ehrpwm", "tbclk", "ehrpwm1_tbclk"),
 110         DT_CLK("48304200.ehrpwm", "tbclk", "ehrpwm2_tbclk"),
 111         { .node_name = NULL },
 112 };
 113
 114 static const char *enable_init_clks[] = {
 115         "dpll_ddr_m2_ck",
 116         "dpll_mpu_m2_ck",
 117         "l3_gclk",
 118         "l4hs_gclk",
 119         "l4fw_gclk",
 120         "l4ls_gclk",
 121         /* Required for external peripherals like, Audio codecs */
 122         "clkout2_ck",
 123 };
 124
 125 int __init am33xx_dt_clk_init(void)
 126 {
 127         struct clk *clk1, *clk2;
 128
 129         ti_dt_clocks_register(am33xx_clks);
 130
 131         omap2_clk_disable_autoidle_all();
 132
 133         omap2_clk_enable_init_clocks(enable_init_clks,
 134                                      ARRAY_SIZE(enable_init_clks));
 135
 136         /* TRM ERRATA: Timer 3 & 6 default parent (TCLKIN) may not be always
 137          *    physically present, in such a case HWMOD enabling of
 138          *    clock would be failure with default parent. And timer
 139          *    probe thinks clock is already enabled, this leads to
 140          *    crash upon accessing timer 3 & 6 registers in probe.
 141          *    Fix by setting parent of both these timers to master
 142          *    oscillator clock.
 143          */
 144
 145         clk1 = clk_get_sys(NULL, "sys_clkin_ck");
 146         clk2 = clk_get_sys(NULL, "timer3_fck");
 147         clk_set_parent(clk2, clk1);
 148
 149         clk2 = clk_get_sys(NULL, "timer6_fck");
 150         clk_set_parent(clk2, clk1);
 151         /*
 152          * The On-Chip 32K RC Osc clock is not an accurate clock-source as per
 153          * the design/spec, so as a result, for example, timer which supposed
 154          * to get expired @60Sec, but will expire somewhere ~@40Sec, which is
 155          * not expected by any use-case, so change WDT1 clock source to PRCM
 156          * 32KHz clock.
 157          */
 158         clk1 = clk_get_sys(NULL, "wdt1_fck");
 159         clk2 = clk_get_sys(NULL, "clkdiv32k_ick");
 160         clk_set_parent(clk1, clk2);
 161
 162         return 0;
 163 }