arch/arm/cpu/armv7/am33xx/clock.c

   1 /*
   2  * clock.c
   3  *
   4  * Clock initialization for AM33XX boards.
   5  * Derived from OMAP4 boards
   6  *
   7  * Copyright (C) 2013, Texas Instruments, Incorporated - http://www.ti.com/
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11 #include <common.h>
  12 #include <asm/arch/cpu.h>
  13 #include <asm/arch/clock.h>
  14 #include <asm/arch/hardware.h>
  15 #include <asm/arch/sys_proto.h>
  16 #include <asm/io.h>
  17
  18 static void setup_post_dividers(const struct dpll_regs *dpll_regs,
  19                          const struct dpll_params *params)
  20 {
  21         /* Setup post-dividers */
  22         if (params->m2 >= 0)
  23                 writel(params->m2, dpll_regs->cm_div_m2_dpll);
  24         if (params->m3 >= 0)
  25                 writel(params->m3, dpll_regs->cm_div_m3_dpll);
  26         if (params->m4 >= 0)
  27                 writel(params->m4, dpll_regs->cm_div_m4_dpll);
  28         if (params->m5 >= 0)
  29                 writel(params->m5, dpll_regs->cm_div_m5_dpll);
  30         if (params->m6 >= 0)
  31                 writel(params->m6, dpll_regs->cm_div_m6_dpll);
  32 }
  33
  34 static inline void do_lock_dpll(const struct dpll_regs *dpll_regs)
  35 {
  36         clrsetbits_le32(dpll_regs->cm_clkmode_dpll,
  37                         CM_CLKMODE_DPLL_DPLL_EN_MASK,
  38                         DPLL_EN_LOCK << CM_CLKMODE_DPLL_EN_SHIFT);
  39 }
  40
  41 static inline void wait_for_lock(const struct dpll_regs *dpll_regs)
  42 {
  43         if (!wait_on_value(ST_DPLL_CLK_MASK, ST_DPLL_CLK_MASK,
  44                            (void *)dpll_regs->cm_idlest_dpll, LDELAY)) {
  45                 printf("DPLL locking failed for 0x%x\n",
  46                        dpll_regs->cm_clkmode_dpll);
  47                 hang();
  48         }
  49 }
  50
  51 static inline void do_bypass_dpll(const struct dpll_regs *dpll_regs)
  52 {
  53         clrsetbits_le32(dpll_regs->cm_clkmode_dpll,
  54                         CM_CLKMODE_DPLL_DPLL_EN_MASK,
  55                         DPLL_EN_MN_BYPASS << CM_CLKMODE_DPLL_EN_SHIFT);
  56 }
  57
  58 static inline void wait_for_bypass(const struct dpll_regs *dpll_regs)
  59 {
  60         if (!wait_on_value(ST_DPLL_CLK_MASK, 0,
  61                            (void *)dpll_regs->cm_idlest_dpll, LDELAY)) {
  62                 printf("Bypassing DPLL failed 0x%x\n",
  63                        dpll_regs->cm_clkmode_dpll);
  64         }
  65 }
  66
  67 static void bypass_dpll(const struct dpll_regs *dpll_regs)
  68 {
  69         do_bypass_dpll(dpll_regs);
  70         wait_for_bypass(dpll_regs);
  71 }
  72
  73 void do_setup_dpll(const struct dpll_regs *dpll_regs,
  74                    const struct dpll_params *params)
  75 {
  76         u32 temp;
  77
  78         if (!params)
  79                 return;
  80
  81         temp = readl(dpll_regs->cm_clksel_dpll);
  82
  83         bypass_dpll(dpll_regs);
  84
  85         /* Set M & N */
  86         temp &= ~CM_CLKSEL_DPLL_M_MASK;
  87         temp |= (params->m << CM_CLKSEL_DPLL_M_SHIFT) & CM_CLKSEL_DPLL_M_MASK;
  88
  89         temp &= ~CM_CLKSEL_DPLL_N_MASK;
  90         temp |= (params->n << CM_CLKSEL_DPLL_N_SHIFT) & CM_CLKSEL_DPLL_N_MASK;
  91
  92         writel(temp, dpll_regs->cm_clksel_dpll);
  93
  94         setup_post_dividers(dpll_regs, params);
  95
  96         /* Wait till the DPLL locks */
  97         do_lock_dpll(dpll_regs);
  98         wait_for_lock(dpll_regs);
  99 }
 100
 101 static void setup_dplls(void)
 102 {
 103         const struct dpll_params *params;
 104
 105         params = get_dpll_core_params();
 106         do_setup_dpll(&dpll_core_regs, params);
 107
 108         params = get_dpll_mpu_params();
 109         do_setup_dpll(&dpll_mpu_regs, params);
 110
 111         params = get_dpll_per_params();
 112         do_setup_dpll(&dpll_per_regs, params);
 113         writel(0x300, &cmwkup->clkdcoldodpllper);
 114
 115         params = get_dpll_ddr_params();
 116         do_setup_dpll(&dpll_ddr_regs, params);
 117 }
 118
 119 static inline void wait_for_clk_enable(u32 *clkctrl_addr)
 120 {
 121         u32 clkctrl, idlest = MODULE_CLKCTRL_IDLEST_DISABLED;
 122         u32 bound = LDELAY;
 123
 124         while ((idlest == MODULE_CLKCTRL_IDLEST_DISABLED) ||
 125                 (idlest == MODULE_CLKCTRL_IDLEST_TRANSITIONING)) {
 126                 clkctrl = readl(clkctrl_addr);
 127                 idlest = (clkctrl & MODULE_CLKCTRL_IDLEST_MASK) >>
 128                          MODULE_CLKCTRL_IDLEST_SHIFT;
 129                 if (--bound == 0) {
 130                         printf("Clock enable failed for 0x%p idlest 0x%x\n",
 131                                clkctrl_addr, clkctrl);
 132                         return;
 133                 }
 134         }
 135 }
 136
 137 static inline void enable_clock_module(u32 *const clkctrl_addr, u32 enable_mode,
 138                                        u32 wait_for_enable)
 139 {
 140         clrsetbits_le32(clkctrl_addr, MODULE_CLKCTRL_MODULEMODE_MASK,
 141                         enable_mode << MODULE_CLKCTRL_MODULEMODE_SHIFT);
 142         debug("Enable clock module - %p\n", clkctrl_addr);
 143         if (wait_for_enable)
 144                 wait_for_clk_enable(clkctrl_addr);
 145 }
 146
 147 static inline void wait_for_clk_disable(u32 *clkctrl_addr)
 148 {
 149         u32 clkctrl, idlest = MODULE_CLKCTRL_IDLEST_FULLY_FUNCTIONAL;
 150         u32 bound = LDELAY;
 151
 152         while ((idlest != MODULE_CLKCTRL_IDLEST_DISABLED)) {
 153                 clkctrl = readl(clkctrl_addr);
 154                 idlest = (clkctrl & MODULE_CLKCTRL_IDLEST_MASK) >>
 155                           MODULE_CLKCTRL_IDLEST_SHIFT;
 156                 if (--bound == 0) {
 157                         printf("Clock disable failed for 0x%p idlest 0x%x\n",
 158                                clkctrl_addr, clkctrl);
 159                          return;
 160                 }
 161         }
 162 }
 163 static inline void disable_clock_module(u32 *const clkctrl_addr,
 164                                         u32 wait_for_disable)
 165 {
 166         clrsetbits_le32(clkctrl_addr, MODULE_CLKCTRL_MODULEMODE_MASK,
 167                         MODULE_CLKCTRL_MODULEMODE_SW_DISABLE <<
 168                         MODULE_CLKCTRL_MODULEMODE_SHIFT);
 169         debug("Disable clock module - %p\n", clkctrl_addr);
 170         if (wait_for_disable)
 171                 wait_for_clk_disable(clkctrl_addr);
 172 }
 173
 174 static inline void enable_clock_domain(u32 *const clkctrl_reg, u32 enable_mode)
 175 {
 176         clrsetbits_le32(clkctrl_reg, CD_CLKCTRL_CLKTRCTRL_MASK,
 177                         enable_mode << CD_CLKCTRL_CLKTRCTRL_SHIFT);
 178         debug("Enable clock domain - %p\n", clkctrl_reg);
 179 }
 180
 181 static inline void disable_clock_domain(u32 *const clkctrl_reg)
 182 {
 183         clrsetbits_le32(clkctrl_reg, CD_CLKCTRL_CLKTRCTRL_MASK,
 184                         CD_CLKCTRL_CLKTRCTRL_SW_SLEEP <<
 185                         CD_CLKCTRL_CLKTRCTRL_SHIFT);
 186         debug("Disable clock domain - %p\n", clkctrl_reg);
 187 }
 188
 189 void do_enable_clocks(u32 *const *clk_domains,
 190                       u32 *const *clk_modules_explicit_en, u8 wait_for_enable)
 191 {
 192         u32 i, max = 100;
 193
 194         /* Put the clock domains in SW_WKUP mode */
 195         for (i = 0; (i < max) && clk_domains[i]; i++) {
 196                 enable_clock_domain(clk_domains[i],
 197                                     CD_CLKCTRL_CLKTRCTRL_SW_WKUP);
 198         }
 199
 200         /* Clock modules that need to be put in SW_EXPLICIT_EN mode */
 201         for (i = 0; (i < max) && clk_modules_explicit_en[i]; i++) {
 202                 enable_clock_module(clk_modules_explicit_en[i],
 203                                     MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN,
 204                                     wait_for_enable);
 205         };
 206 }
 207
 208 void do_disable_clocks(u32 *const *clk_domains,
 209                         u32 *const *clk_modules_disable,
 210                         u8 wait_for_disable)
 211 {
 212         u32 i, max = 100;
 213
 214
 215         /* Clock modules that need to be put in SW_DISABLE */
 216         for (i = 0; (i < max) && clk_modules_disable[i]; i++)
 217                 disable_clock_module(clk_modules_disable[i],
 218                                      wait_for_disable);
 219
 220         /* Put the clock domains in SW_SLEEP mode */
 221         for (i = 0; (i < max) && clk_domains[i]; i++)
 222                 disable_clock_domain(clk_domains[i]);
 223 }
 224
 225 /*
 226  * Before scaling up the clocks we need to have the PMIC scale up the
 227  * voltages first.  This will be dependent on which PMIC is in use
 228  * and in some cases we may not be scaling things up at all and thus not
 229  * need to do anything here.
 230  */
 231 __weak void scale_vcores(void)
 232 {
 233 }
 234
 235 void prcm_init()
 236 {
 237         enable_basic_clocks();
 238         scale_vcores();
 239         setup_dplls();
 240 }