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 #include <dt-bindings/clock/am3.h>
  23
  24 #include "clock.h"
  25
  26 static const char * const am3_gpio1_dbclk_parents[] __initconst = {
  27         "l4_per_cm:clk:0138:0",
  28         NULL,
  29 };
  30
  31 static const struct omap_clkctrl_bit_data am3_gpio2_bit_data[] __initconst = {
  32         { 18, TI_CLK_GATE, am3_gpio1_dbclk_parents, NULL },
  33         { 0 },
  34 };
  35
  36 static const struct omap_clkctrl_bit_data am3_gpio3_bit_data[] __initconst = {
  37         { 18, TI_CLK_GATE, am3_gpio1_dbclk_parents, NULL },
  38         { 0 },
  39 };
  40
  41 static const struct omap_clkctrl_bit_data am3_gpio4_bit_data[] __initconst = {
  42         { 18, TI_CLK_GATE, am3_gpio1_dbclk_parents, NULL },
  43         { 0 },
  44 };
  45
  46 static const struct omap_clkctrl_reg_data am3_l4_per_clkctrl_regs[] __initconst = {
  47         { AM3_CPGMAC0_CLKCTRL, NULL, CLKF_SW_SUP, "cpsw_125mhz_gclk", "cpsw_125mhz_clkdm" },
  48         { AM3_LCDC_CLKCTRL, NULL, CLKF_SW_SUP | CLKF_SET_RATE_PARENT, "lcd_gclk", "lcdc_clkdm" },
  49         { AM3_USB_OTG_HS_CLKCTRL, NULL, CLKF_SW_SUP, "usbotg_fck", "l3s_clkdm" },
  50         { AM3_TPTC0_CLKCTRL, NULL, CLKF_SW_SUP, "l3_gclk", "l3_clkdm" },
  51         { AM3_EMIF_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_ddr_m2_div2_ck", "l3_clkdm" },
  52         { AM3_OCMCRAM_CLKCTRL, NULL, CLKF_SW_SUP, "l3_gclk", "l3_clkdm" },
  53         { AM3_GPMC_CLKCTRL, NULL, CLKF_SW_SUP, "l3s_gclk", "l3s_clkdm" },
  54         { AM3_MCASP0_CLKCTRL, NULL, CLKF_SW_SUP, "mcasp0_fck", "l3s_clkdm" },
  55         { AM3_UART6_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_ck" },
  56         { AM3_MMC1_CLKCTRL, NULL, CLKF_SW_SUP, "mmc_clk" },
  57         { AM3_ELM_CLKCTRL, NULL, CLKF_SW_SUP, "l4ls_gclk" },
  58         { AM3_I2C3_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_ck" },
  59         { AM3_I2C2_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_ck" },
  60         { AM3_SPI0_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_ck" },
  61         { AM3_SPI1_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_ck" },
  62         { AM3_L4_LS_CLKCTRL, NULL, CLKF_SW_SUP, "l4ls_gclk" },
  63         { AM3_MCASP1_CLKCTRL, NULL, CLKF_SW_SUP, "mcasp1_fck", "l3s_clkdm" },
  64         { AM3_UART2_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_ck" },
  65         { AM3_UART3_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_ck" },
  66         { AM3_UART4_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_ck" },
  67         { AM3_UART5_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_ck" },
  68         { AM3_TIMER7_CLKCTRL, NULL, CLKF_SW_SUP, "timer7_fck" },
  69         { AM3_TIMER2_CLKCTRL, NULL, CLKF_SW_SUP, "timer2_fck" },
  70         { AM3_TIMER3_CLKCTRL, NULL, CLKF_SW_SUP, "timer3_fck" },
  71         { AM3_TIMER4_CLKCTRL, NULL, CLKF_SW_SUP, "timer4_fck" },
  72         { AM3_RNG_CLKCTRL, NULL, CLKF_SW_SUP, "rng_fck" },
  73         { AM3_AES_CLKCTRL, NULL, CLKF_SW_SUP, "aes0_fck", "l3_clkdm" },
  74         { AM3_SHAM_CLKCTRL, NULL, CLKF_SW_SUP, "l3_gclk", "l3_clkdm" },
  75         { AM3_GPIO2_CLKCTRL, am3_gpio2_bit_data, CLKF_SW_SUP, "l4ls_gclk" },
  76         { AM3_GPIO3_CLKCTRL, am3_gpio3_bit_data, CLKF_SW_SUP, "l4ls_gclk" },
  77         { AM3_GPIO4_CLKCTRL, am3_gpio4_bit_data, CLKF_SW_SUP, "l4ls_gclk" },
  78         { AM3_TPCC_CLKCTRL, NULL, CLKF_SW_SUP, "l3_gclk", "l3_clkdm" },
  79         { AM3_D_CAN0_CLKCTRL, NULL, CLKF_SW_SUP, "dcan0_fck" },
  80         { AM3_D_CAN1_CLKCTRL, NULL, CLKF_SW_SUP, "dcan1_fck" },
  81         { AM3_EPWMSS1_CLKCTRL, NULL, CLKF_SW_SUP, "l4ls_gclk" },
  82         { AM3_EPWMSS0_CLKCTRL, NULL, CLKF_SW_SUP, "l4ls_gclk" },
  83         { AM3_EPWMSS2_CLKCTRL, NULL, CLKF_SW_SUP, "l4ls_gclk" },
  84         { AM3_L3_INSTR_CLKCTRL, NULL, CLKF_SW_SUP, "l3_gclk", "l3_clkdm" },
  85         { AM3_L3_MAIN_CLKCTRL, NULL, CLKF_SW_SUP, "l3_gclk", "l3_clkdm" },
  86         { AM3_PRUSS_CLKCTRL, NULL, CLKF_SW_SUP, "pruss_ocp_gclk", "pruss_ocp_clkdm" },
  87         { AM3_TIMER5_CLKCTRL, NULL, CLKF_SW_SUP, "timer5_fck" },
  88         { AM3_TIMER6_CLKCTRL, NULL, CLKF_SW_SUP, "timer6_fck" },
  89         { AM3_MMC2_CLKCTRL, NULL, CLKF_SW_SUP, "mmc_clk" },
  90         { AM3_MMC3_CLKCTRL, NULL, CLKF_SW_SUP, "mmc_clk", "l3s_clkdm" },
  91         { AM3_TPTC1_CLKCTRL, NULL, CLKF_SW_SUP, "l3_gclk", "l3_clkdm" },
  92         { AM3_TPTC2_CLKCTRL, NULL, CLKF_SW_SUP, "l3_gclk", "l3_clkdm" },
  93         { AM3_SPINLOCK_CLKCTRL, NULL, CLKF_SW_SUP, "l4ls_gclk" },
  94         { AM3_MAILBOX_CLKCTRL, NULL, CLKF_SW_SUP, "l4ls_gclk" },
  95         { AM3_L4_HS_CLKCTRL, NULL, CLKF_SW_SUP, "l4hs_gclk", "l4hs_clkdm" },
  96         { AM3_OCPWP_CLKCTRL, NULL, CLKF_SW_SUP, "l4ls_gclk" },
  97         { AM3_CLKDIV32K_CLKCTRL, NULL, CLKF_SW_SUP, "clkdiv32k_ck", "clk_24mhz_clkdm" },
  98         { 0 },
  99 };
 100
 101 static const char * const am3_gpio0_dbclk_parents[] __initconst = {
 102         "gpio0_dbclk_mux_ck",
 103         NULL,
 104 };
 105
 106 static const struct omap_clkctrl_bit_data am3_gpio1_bit_data[] __initconst = {
 107         { 18, TI_CLK_GATE, am3_gpio0_dbclk_parents, NULL },
 108         { 0 },
 109 };
 110
 111 static const char * const am3_dbg_sysclk_ck_parents[] __initconst = {
 112         "sys_clkin_ck",
 113         NULL,
 114 };
 115
 116 static const char * const am3_trace_pmd_clk_mux_ck_parents[] __initconst = {
 117         "l4_wkup_cm:clk:0010:19",
 118         "l4_wkup_cm:clk:0010:30",
 119         NULL,
 120 };
 121
 122 static const char * const am3_trace_clk_div_ck_parents[] __initconst = {
 123         "l4_wkup_cm:clk:0010:20",
 124         NULL,
 125 };
 126
 127 static const struct omap_clkctrl_div_data am3_trace_clk_div_ck_data __initconst = {
 128         .max_div = 64,
 129         .flags = CLK_DIVIDER_POWER_OF_TWO,
 130 };
 131
 132 static const char * const am3_stm_clk_div_ck_parents[] __initconst = {
 133         "l4_wkup_cm:clk:0010:22",
 134         NULL,
 135 };
 136
 137 static const struct omap_clkctrl_div_data am3_stm_clk_div_ck_data __initconst = {
 138         .max_div = 64,
 139         .flags = CLK_DIVIDER_POWER_OF_TWO,
 140 };
 141
 142 static const char * const am3_dbg_clka_ck_parents[] __initconst = {
 143         "dpll_core_m4_ck",
 144         NULL,
 145 };
 146
 147 static const struct omap_clkctrl_bit_data am3_debugss_bit_data[] __initconst = {
 148         { 19, TI_CLK_GATE, am3_dbg_sysclk_ck_parents, NULL },
 149         { 20, TI_CLK_MUX, am3_trace_pmd_clk_mux_ck_parents, NULL },
 150         { 22, TI_CLK_MUX, am3_trace_pmd_clk_mux_ck_parents, NULL },
 151         { 24, TI_CLK_DIVIDER, am3_trace_clk_div_ck_parents, &am3_trace_clk_div_ck_data },
 152         { 27, TI_CLK_DIVIDER, am3_stm_clk_div_ck_parents, &am3_stm_clk_div_ck_data },
 153         { 30, TI_CLK_GATE, am3_dbg_clka_ck_parents, NULL },
 154         { 0 },
 155 };
 156
 157 static const struct omap_clkctrl_reg_data am3_l4_wkup_clkctrl_regs[] __initconst = {
 158         { AM3_CONTROL_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_core_m4_div2_ck" },
 159         { AM3_GPIO1_CLKCTRL, am3_gpio1_bit_data, CLKF_SW_SUP, "dpll_core_m4_div2_ck" },
 160         { AM3_L4_WKUP_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_core_m4_div2_ck" },
 161         { AM3_DEBUGSS_CLKCTRL, am3_debugss_bit_data, CLKF_SW_SUP, "l4_wkup_cm:clk:0010:24", "l3_aon_clkdm" },
 162         { AM3_WKUP_M3_CLKCTRL, NULL, CLKF_NO_IDLEST, "dpll_core_m4_div2_ck", "l4_wkup_aon_clkdm" },
 163         { AM3_UART1_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_wkupdm_ck" },
 164         { AM3_I2C1_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_wkupdm_ck" },
 165         { AM3_ADC_TSC_CLKCTRL, NULL, CLKF_SW_SUP, "adc_tsc_fck" },
 166         { AM3_SMARTREFLEX0_CLKCTRL, NULL, CLKF_SW_SUP, "smartreflex0_fck" },
 167         { AM3_TIMER1_CLKCTRL, NULL, CLKF_SW_SUP, "timer1_fck" },
 168         { AM3_SMARTREFLEX1_CLKCTRL, NULL, CLKF_SW_SUP, "smartreflex1_fck" },
 169         { AM3_WD_TIMER2_CLKCTRL, NULL, CLKF_SW_SUP, "wdt1_fck" },
 170         { 0 },
 171 };
 172
 173 static const struct omap_clkctrl_reg_data am3_mpu_clkctrl_regs[] __initconst = {
 174         { AM3_MPU_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_mpu_m2_ck" },
 175         { 0 },
 176 };
 177
 178 static const struct omap_clkctrl_reg_data am3_l4_rtc_clkctrl_regs[] __initconst = {
 179         { AM3_RTC_CLKCTRL, NULL, CLKF_SW_SUP, "clk_32768_ck" },
 180         { 0 },
 181 };
 182
 183 static const struct omap_clkctrl_reg_data am3_gfx_l3_clkctrl_regs[] __initconst = {
 184         { AM3_GFX_CLKCTRL, NULL, CLKF_SW_SUP, "gfx_fck_div_ck" },
 185         { 0 },
 186 };
 187
 188 static const struct omap_clkctrl_reg_data am3_l4_cefuse_clkctrl_regs[] __initconst = {
 189         { AM3_CEFUSE_CLKCTRL, NULL, CLKF_SW_SUP, "sys_clkin_ck" },
 190         { 0 },
 191 };
 192
 193 const struct omap_clkctrl_data am3_clkctrl_data[] __initconst = {
 194         { 0x44e00014, am3_l4_per_clkctrl_regs },
 195         { 0x44e00404, am3_l4_wkup_clkctrl_regs },
 196         { 0x44e00604, am3_mpu_clkctrl_regs },
 197         { 0x44e00800, am3_l4_rtc_clkctrl_regs },
 198         { 0x44e00904, am3_gfx_l3_clkctrl_regs },
 199         { 0x44e00a20, am3_l4_cefuse_clkctrl_regs },
 200         { 0 },
 201 };
 202
 203 static struct ti_dt_clk am33xx_clks[] = {
 204         DT_CLK(NULL, "timer_32k_ck", "l4_per_cm:0138:0"),
 205         DT_CLK(NULL, "timer_sys_ck", "sys_clkin_ck"),
 206         DT_CLK(NULL, "clkdiv32k_ick", "l4_per_cm:0138:0"),
 207         DT_CLK(NULL, "dbg_clka_ck", "l4_wkup_cm:0010:30"),
 208         DT_CLK(NULL, "dbg_sysclk_ck", "l4_wkup_cm:0010:19"),
 209         DT_CLK(NULL, "gpio0_dbclk", "l4_wkup_cm:0004:18"),
 210         DT_CLK(NULL, "gpio1_dbclk", "l4_per_cm:0098:18"),
 211         DT_CLK(NULL, "gpio2_dbclk", "l4_per_cm:009c:18"),
 212         DT_CLK(NULL, "gpio3_dbclk", "l4_per_cm:00a0:18"),
 213         DT_CLK(NULL, "stm_clk_div_ck", "l4_wkup_cm:0010:27"),
 214         DT_CLK(NULL, "stm_pmd_clock_mux_ck", "l4_wkup_cm:0010:22"),
 215         DT_CLK(NULL, "trace_clk_div_ck", "l4_wkup_cm:0010:24"),
 216         DT_CLK(NULL, "trace_pmd_clk_mux_ck", "l4_wkup_cm:0010:20"),
 217         { .node_name = NULL },
 218 };
 219
 220 static const char *enable_init_clks[] = {
 221         "dpll_ddr_m2_ck",
 222         "dpll_mpu_m2_ck",
 223         "l3_gclk",
 224         "l4hs_gclk",
 225         "l4fw_gclk",
 226         "l4ls_gclk",
 227         /* Required for external peripherals like, Audio codecs */
 228         "clkout2_ck",
 229 };
 230
 231 int __init am33xx_dt_clk_init(void)
 232 {
 233         struct clk *clk1, *clk2;
 234
 235         ti_dt_clocks_register(am33xx_clks);
 236
 237         omap2_clk_disable_autoidle_all();
 238
 239         ti_clk_add_aliases();
 240
 241         omap2_clk_enable_init_clocks(enable_init_clks,
 242                                      ARRAY_SIZE(enable_init_clks));
 243
 244         /* TRM ERRATA: Timer 3 & 6 default parent (TCLKIN) may not be always
 245          *    physically present, in such a case HWMOD enabling of
 246          *    clock would be failure with default parent. And timer
 247          *    probe thinks clock is already enabled, this leads to
 248          *    crash upon accessing timer 3 & 6 registers in probe.
 249          *    Fix by setting parent of both these timers to master
 250          *    oscillator clock.
 251          */
 252
 253         clk1 = clk_get_sys(NULL, "sys_clkin_ck");
 254         clk2 = clk_get_sys(NULL, "timer3_fck");
 255         clk_set_parent(clk2, clk1);
 256
 257         clk2 = clk_get_sys(NULL, "timer6_fck");
 258         clk_set_parent(clk2, clk1);
 259         /*
 260          * The On-Chip 32K RC Osc clock is not an accurate clock-source as per
 261          * the design/spec, so as a result, for example, timer which supposed
 262          * to get expired @60Sec, but will expire somewhere ~@40Sec, which is
 263          * not expected by any use-case, so change WDT1 clock source to PRCM
 264          * 32KHz clock.
 265          */
 266         clk1 = clk_get_sys(NULL, "wdt1_fck");
 267         clk2 = clk_get_sys(NULL, "clkdiv32k_ick");
 268         clk_set_parent(clk1, clk2);
 269
 270         return 0;
 271 }