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

   1 /*
   2  * clock.c
   3  *
   4  * clocks for AM33XX based boards
   5  *
   6  * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <common.h>
  20 #include <asm/arch/cpu.h>
  21 #include <asm/arch/clock.h>
  22 #include <asm/arch/hardware.h>
  23 #include <asm/io.h>
  24
  25 #define PRCM_MOD_EN             0x2
  26 #define PRCM_FORCE_WAKEUP       0x2
  27 #define PRCM_FUNCTL             0x0
  28
  29 #define PRCM_EMIF_CLK_ACTIVITY  BIT(2)
  30 #define PRCM_L3_GCLK_ACTIVITY   BIT(4)
  31
  32 #define PLL_BYPASS_MODE         0x4
  33 #define ST_MN_BYPASS            0x00000100
  34 #define ST_DPLL_CLK             0x00000001
  35 #define CLK_SEL_MASK            0x7ffff
  36 #define CLK_DIV_MASK            0x1f
  37 #define CLK_DIV2_MASK           0x7f
  38 #define CLK_SEL_SHIFT           0x8
  39 #define CLK_MODE_SEL            0x7
  40 #define CLK_MODE_MASK           0xfffffff8
  41 #define CLK_DIV_SEL             0xFFFFFFE0
  42 #define CPGMAC0_IDLE            0x30000
  43
  44 const struct cm_perpll *cmper = (struct cm_perpll *)CM_PER;
  45 const struct cm_wkuppll *cmwkup = (struct cm_wkuppll *)CM_WKUP;
  46 const struct cm_dpll *cmdpll = (struct cm_dpll *)CM_DPLL;
  47 const struct cm_rtc *cmrtc = (struct cm_rtc *)CM_RTC;
  48
  49 static void enable_interface_clocks(void)
  50 {
  51         /* Enable all the Interconnect Modules */
  52         writel(PRCM_MOD_EN, &cmper->l3clkctrl);
  53         while (readl(&cmper->l3clkctrl) != PRCM_MOD_EN)
  54                 ;
  55
  56         writel(PRCM_MOD_EN, &cmper->l4lsclkctrl);
  57         while (readl(&cmper->l4lsclkctrl) != PRCM_MOD_EN)
  58                 ;
  59
  60         writel(PRCM_MOD_EN, &cmper->l4fwclkctrl);
  61         while (readl(&cmper->l4fwclkctrl) != PRCM_MOD_EN)
  62                 ;
  63
  64         writel(PRCM_MOD_EN, &cmwkup->wkl4wkclkctrl);
  65         while (readl(&cmwkup->wkl4wkclkctrl) != PRCM_MOD_EN)
  66                 ;
  67
  68         writel(PRCM_MOD_EN, &cmper->l3instrclkctrl);
  69         while (readl(&cmper->l3instrclkctrl) != PRCM_MOD_EN)
  70                 ;
  71
  72         writel(PRCM_MOD_EN, &cmper->l4hsclkctrl);
  73         while (readl(&cmper->l4hsclkctrl) != PRCM_MOD_EN)
  74                 ;
  75
  76         writel(PRCM_MOD_EN, &cmwkup->wkgpio0clkctrl);
  77         while (readl(&cmwkup->wkgpio0clkctrl) != PRCM_MOD_EN)
  78                 ;
  79 }
  80
  81 /*
  82  * Force power domain wake up transition
  83  * Ensure that the corresponding interface clock is active before
  84  * using the peripheral
  85  */
  86 static void power_domain_wkup_transition(void)
  87 {
  88         writel(PRCM_FORCE_WAKEUP, &cmper->l3clkstctrl);
  89         writel(PRCM_FORCE_WAKEUP, &cmper->l4lsclkstctrl);
  90         writel(PRCM_FORCE_WAKEUP, &cmwkup->wkclkstctrl);
  91         writel(PRCM_FORCE_WAKEUP, &cmper->l4fwclkstctrl);
  92         writel(PRCM_FORCE_WAKEUP, &cmper->l3sclkstctrl);
  93 }
  94
  95 /*
  96  * Enable the peripheral clock for required peripherals
  97  */
  98 static void enable_per_clocks(void)
  99 {
 100         /* Enable the control module though RBL would have done it*/
 101         writel(PRCM_MOD_EN, &cmwkup->wkctrlclkctrl);
 102         while (readl(&cmwkup->wkctrlclkctrl) != PRCM_MOD_EN)
 103                 ;
 104
 105         /* Enable the module clock */
 106         writel(PRCM_MOD_EN, &cmper->timer2clkctrl);
 107         while (readl(&cmper->timer2clkctrl) != PRCM_MOD_EN)
 108                 ;
 109
 110         /* Select the Master osc 24 MHZ as Timer2 clock source */
 111         writel(0x1, &cmdpll->clktimer2clk);
 112
 113         /* UART0 */
 114         writel(PRCM_MOD_EN, &cmwkup->wkup_uart0ctrl);
 115         while (readl(&cmwkup->wkup_uart0ctrl) != PRCM_MOD_EN)
 116                 ;
 117
 118         /* UART1 */
 119 #ifdef CONFIG_SERIAL2
 120         writel(PRCM_MOD_EN, &cmper->uart1clkctrl);
 121         while (readl(&cmper->uart1clkctrl) != PRCM_MOD_EN)
 122                 ;
 123 #endif /* CONFIG_SERIAL2 */
 124
 125         /* UART2 */
 126 #ifdef CONFIG_SERIAL3
 127         writel(PRCM_MOD_EN, &cmper->uart2clkctrl);
 128         while (readl(&cmper->uart2clkctrl) != PRCM_MOD_EN)
 129                 ;
 130 #endif /* CONFIG_SERIAL3 */
 131
 132         /* UART3 */
 133 #ifdef CONFIG_SERIAL4
 134         writel(PRCM_MOD_EN, &cmper->uart3clkctrl);
 135         while (readl(&cmper->uart3clkctrl) != PRCM_MOD_EN)
 136                 ;
 137 #endif /* CONFIG_SERIAL4 */
 138
 139         /* UART4 */
 140 #ifdef CONFIG_SERIAL5
 141         writel(PRCM_MOD_EN, &cmper->uart4clkctrl);
 142         while (readl(&cmper->uart4clkctrl) != PRCM_MOD_EN)
 143                 ;
 144 #endif /* CONFIG_SERIAL5 */
 145
 146         /* UART5 */
 147 #ifdef CONFIG_SERIAL6
 148         writel(PRCM_MOD_EN, &cmper->uart5clkctrl);
 149         while (readl(&cmper->uart5clkctrl) != PRCM_MOD_EN)
 150                 ;
 151 #endif /* CONFIG_SERIAL6 */
 152
 153         /* MMC0*/
 154         writel(PRCM_MOD_EN, &cmper->mmc0clkctrl);
 155         while (readl(&cmper->mmc0clkctrl) != PRCM_MOD_EN)
 156                 ;
 157
 158         /* i2c0 */
 159         writel(PRCM_MOD_EN, &cmwkup->wkup_i2c0ctrl);
 160         while (readl(&cmwkup->wkup_i2c0ctrl) != PRCM_MOD_EN)
 161                 ;
 162
 163         /* gpio1 module */
 164         writel(PRCM_MOD_EN, &cmper->gpio1clkctrl);
 165         while (readl(&cmper->gpio1clkctrl) != PRCM_MOD_EN)
 166                 ;
 167
 168         /* gpio2 module */
 169         writel(PRCM_MOD_EN, &cmper->gpio2clkctrl);
 170         while (readl(&cmper->gpio2clkctrl) != PRCM_MOD_EN)
 171                 ;
 172
 173         /* gpio3 module */
 174         writel(PRCM_MOD_EN, &cmper->gpio3clkctrl);
 175         while (readl(&cmper->gpio3clkctrl) != PRCM_MOD_EN)
 176                 ;
 177
 178         /* i2c1 */
 179         writel(PRCM_MOD_EN, &cmper->i2c1clkctrl);
 180         while (readl(&cmper->i2c1clkctrl) != PRCM_MOD_EN)
 181                 ;
 182
 183         /* Ethernet */
 184         writel(PRCM_MOD_EN, &cmper->cpgmac0clkctrl);
 185         while ((readl(&cmper->cpgmac0clkctrl) & CPGMAC0_IDLE) != PRCM_FUNCTL)
 186                 ;
 187
 188         /* spi0 */
 189         writel(PRCM_MOD_EN, &cmper->spi0clkctrl);
 190         while (readl(&cmper->spi0clkctrl) != PRCM_MOD_EN)
 191                 ;
 192
 193         /* RTC */
 194         writel(PRCM_MOD_EN, &cmrtc->rtcclkctrl);
 195         while (readl(&cmrtc->rtcclkctrl) != PRCM_MOD_EN)
 196                 ;
 197 }
 198
 199 static void mpu_pll_config(void)
 200 {
 201         u32 clkmode, clksel, div_m2;
 202
 203         clkmode = readl(&cmwkup->clkmoddpllmpu);
 204         clksel = readl(&cmwkup->clkseldpllmpu);
 205         div_m2 = readl(&cmwkup->divm2dpllmpu);
 206
 207         /* Set the PLL to bypass Mode */
 208         writel(PLL_BYPASS_MODE, &cmwkup->clkmoddpllmpu);
 209         while (readl(&cmwkup->idlestdpllmpu) != ST_MN_BYPASS)
 210                 ;
 211
 212         clksel = clksel & (~CLK_SEL_MASK);
 213         clksel = clksel | ((MPUPLL_M << CLK_SEL_SHIFT) | MPUPLL_N);
 214         writel(clksel, &cmwkup->clkseldpllmpu);
 215
 216         div_m2 = div_m2 & ~CLK_DIV_MASK;
 217         div_m2 = div_m2 | MPUPLL_M2;
 218         writel(div_m2, &cmwkup->divm2dpllmpu);
 219
 220         clkmode = clkmode | CLK_MODE_SEL;
 221         writel(clkmode, &cmwkup->clkmoddpllmpu);
 222
 223         while (readl(&cmwkup->idlestdpllmpu) != ST_DPLL_CLK)
 224                 ;
 225 }
 226
 227 static void core_pll_config(void)
 228 {
 229         u32 clkmode, clksel, div_m4, div_m5, div_m6;
 230
 231         clkmode = readl(&cmwkup->clkmoddpllcore);
 232         clksel = readl(&cmwkup->clkseldpllcore);
 233         div_m4 = readl(&cmwkup->divm4dpllcore);
 234         div_m5 = readl(&cmwkup->divm5dpllcore);
 235         div_m6 = readl(&cmwkup->divm6dpllcore);
 236
 237         /* Set the PLL to bypass Mode */
 238         writel(PLL_BYPASS_MODE, &cmwkup->clkmoddpllcore);
 239
 240         while (readl(&cmwkup->idlestdpllcore) != ST_MN_BYPASS)
 241                 ;
 242
 243         clksel = clksel & (~CLK_SEL_MASK);
 244         clksel = clksel | ((COREPLL_M << CLK_SEL_SHIFT) | COREPLL_N);
 245         writel(clksel, &cmwkup->clkseldpllcore);
 246
 247         div_m4 = div_m4 & ~CLK_DIV_MASK;
 248         div_m4 = div_m4 | COREPLL_M4;
 249         writel(div_m4, &cmwkup->divm4dpllcore);
 250
 251         div_m5 = div_m5 & ~CLK_DIV_MASK;
 252         div_m5 = div_m5 | COREPLL_M5;
 253         writel(div_m5, &cmwkup->divm5dpllcore);
 254
 255         div_m6 = div_m6 & ~CLK_DIV_MASK;
 256         div_m6 = div_m6 | COREPLL_M6;
 257         writel(div_m6, &cmwkup->divm6dpllcore);
 258
 259         clkmode = clkmode | CLK_MODE_SEL;
 260         writel(clkmode, &cmwkup->clkmoddpllcore);
 261
 262         while (readl(&cmwkup->idlestdpllcore) != ST_DPLL_CLK)
 263                 ;
 264 }
 265
 266 static void per_pll_config(void)
 267 {
 268         u32 clkmode, clksel, div_m2;
 269
 270         clkmode = readl(&cmwkup->clkmoddpllper);
 271         clksel = readl(&cmwkup->clkseldpllper);
 272         div_m2 = readl(&cmwkup->divm2dpllper);
 273
 274         /* Set the PLL to bypass Mode */
 275         writel(PLL_BYPASS_MODE, &cmwkup->clkmoddpllper);
 276
 277         while (readl(&cmwkup->idlestdpllper) != ST_MN_BYPASS)
 278                 ;
 279
 280         clksel = clksel & (~CLK_SEL_MASK);
 281         clksel = clksel | ((PERPLL_M << CLK_SEL_SHIFT) | PERPLL_N);
 282         writel(clksel, &cmwkup->clkseldpllper);
 283
 284         div_m2 = div_m2 & ~CLK_DIV2_MASK;
 285         div_m2 = div_m2 | PERPLL_M2;
 286         writel(div_m2, &cmwkup->divm2dpllper);
 287
 288         clkmode = clkmode | CLK_MODE_SEL;
 289         writel(clkmode, &cmwkup->clkmoddpllper);
 290
 291         while (readl(&cmwkup->idlestdpllper) != ST_DPLL_CLK)
 292                 ;
 293 }
 294
 295 void ddr_pll_config(unsigned int ddrpll_m)
 296 {
 297         u32 clkmode, clksel, div_m2;
 298
 299         clkmode = readl(&cmwkup->clkmoddpllddr);
 300         clksel = readl(&cmwkup->clkseldpllddr);
 301         div_m2 = readl(&cmwkup->divm2dpllddr);
 302
 303         /* Set the PLL to bypass Mode */
 304         clkmode = (clkmode & CLK_MODE_MASK) | PLL_BYPASS_MODE;
 305         writel(clkmode, &cmwkup->clkmoddpllddr);
 306
 307         /* Wait till bypass mode is enabled */
 308         while ((readl(&cmwkup->idlestdpllddr) & ST_MN_BYPASS)
 309                                 != ST_MN_BYPASS)
 310                 ;
 311
 312         clksel = clksel & (~CLK_SEL_MASK);
 313         clksel = clksel | ((ddrpll_m << CLK_SEL_SHIFT) | DDRPLL_N);
 314         writel(clksel, &cmwkup->clkseldpllddr);
 315
 316         div_m2 = div_m2 & CLK_DIV_SEL;
 317         div_m2 = div_m2 | DDRPLL_M2;
 318         writel(div_m2, &cmwkup->divm2dpllddr);
 319
 320         clkmode = (clkmode & CLK_MODE_MASK) | CLK_MODE_SEL;
 321         writel(clkmode, &cmwkup->clkmoddpllddr);
 322
 323         /* Wait till dpll is locked */
 324         while ((readl(&cmwkup->idlestdpllddr) & ST_DPLL_CLK) != ST_DPLL_CLK)
 325                 ;
 326 }
 327
 328 void enable_emif_clocks(void)
 329 {
 330         /* Enable the  EMIF_FW Functional clock */
 331         writel(PRCM_MOD_EN, &cmper->emiffwclkctrl);
 332         /* Enable EMIF0 Clock */
 333         writel(PRCM_MOD_EN, &cmper->emifclkctrl);
 334         /* Poll if module is functional */
 335         while ((readl(&cmper->emifclkctrl)) != PRCM_MOD_EN)
 336                 ;
 337 }
 338
 339 /*
 340  * Configure the PLL/PRCM for necessary peripherals
 341  */
 342 void pll_init()
 343 {
 344         mpu_pll_config();
 345         core_pll_config();
 346         per_pll_config();
 347
 348         /* Enable the required interconnect clocks */
 349         enable_interface_clocks();
 350
 351         /* Power domain wake up transition */
 352         power_domain_wkup_transition();
 353
 354         /* Enable the required peripherals */
 355         enable_per_clocks();
 356 }