arch/arm/mach-keystone/clock.c

   1 /*
   2  * Keystone2: pll initialization
   3  *
   4  * (C) Copyright 2012-2014
   5  *     Texas Instruments Incorporated, <www.ti.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <asm/arch/clock.h>
  12 #include <asm/arch/clock_defs.h>
  13
  14 /* DEV and ARM speed definitions as specified in DEVSPEED register */
  15 int __weak speeds[DEVSPEED_NUMSPDS] = {
  16         SPD1000,
  17         SPD1200,
  18         SPD1350,
  19         SPD1400,
  20         SPD1500,
  21         SPD1400,
  22         SPD1350,
  23         SPD1200,
  24         SPD1000,
  25         SPD800,
  26 };
  27
  28 const struct keystone_pll_regs keystone_pll_regs[] = {
  29         [CORE_PLL]      = {KS2_MAINPLLCTL0, KS2_MAINPLLCTL1},
  30         [PASS_PLL]      = {KS2_PASSPLLCTL0, KS2_PASSPLLCTL1},
  31         [TETRIS_PLL]    = {KS2_ARMPLLCTL0, KS2_ARMPLLCTL1},
  32         [DDR3A_PLL]     = {KS2_DDR3APLLCTL0, KS2_DDR3APLLCTL1},
  33         [DDR3B_PLL]     = {KS2_DDR3BPLLCTL0, KS2_DDR3BPLLCTL1},
  34         [UART_PLL]      = {KS2_UARTPLLCTL0, KS2_UARTPLLCTL1},
  35 };
  36
  37 inline void pll_pa_clk_sel(void)
  38 {
  39         setbits_le32(keystone_pll_regs[PASS_PLL].reg1, CFG_PLLCTL1_PAPLL_MASK);
  40 }
  41
  42 static void wait_for_completion(const struct pll_init_data *data)
  43 {
  44         int i;
  45         for (i = 0; i < 100; i++) {
  46                 sdelay(450);
  47                 if (!(pllctl_reg_read(data->pll, stat) & PLLSTAT_GOSTAT_MASK))
  48                         break;
  49         }
  50 }
  51
  52 static inline void bypass_main_pll(const struct pll_init_data *data)
  53 {
  54         pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLENSRC_MASK |
  55                            PLLCTL_PLLEN_MASK);
  56
  57         /* 4 cycles of reference clock CLKIN*/
  58         sdelay(340);
  59 }
  60
  61 static void configure_mult_div(const struct pll_init_data *data)
  62 {
  63         u32 pllm, plld, bwadj;
  64
  65         pllm = data->pll_m - 1;
  66         plld = (data->pll_d - 1) & CFG_PLLCTL0_PLLD_MASK;
  67
  68         /* Program Multiplier */
  69         if (data->pll == MAIN_PLL)
  70                 pllctl_reg_write(data->pll, mult, pllm & PLLM_MULT_LO_MASK);
  71
  72         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
  73                         CFG_PLLCTL0_PLLM_MASK,
  74                         pllm << CFG_PLLCTL0_PLLM_SHIFT);
  75
  76         /* Program BWADJ */
  77         bwadj = (data->pll_m - 1) >> 1; /* Divide pllm by 2 */
  78         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
  79                         CFG_PLLCTL0_BWADJ_MASK,
  80                         (bwadj << CFG_PLLCTL0_BWADJ_SHIFT) &
  81                         CFG_PLLCTL0_BWADJ_MASK);
  82         bwadj = bwadj >> CFG_PLLCTL0_BWADJ_BITS;
  83         clrsetbits_le32(keystone_pll_regs[data->pll].reg1,
  84                         CFG_PLLCTL1_BWADJ_MASK, bwadj);
  85
  86         /* Program Divider */
  87         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
  88                         CFG_PLLCTL0_PLLD_MASK, plld);
  89 }
  90
  91 void configure_main_pll(const struct pll_init_data *data)
  92 {
  93         u32 tmp, pllod, i, alnctl_val = 0;
  94         u32 *offset;
  95
  96         pllod = data->pll_od - 1;
  97
  98         /* 100 micro sec for stabilization */
  99         sdelay(210000);
 100
 101         tmp = pllctl_reg_read(data->pll, secctl);
 102
 103         /* Check for Bypass */
 104         if (tmp & SECCTL_BYPASS_MASK) {
 105                 setbits_le32(keystone_pll_regs[data->pll].reg1,
 106                              CFG_PLLCTL1_ENSAT_MASK);
 107
 108                 bypass_main_pll(data);
 109
 110                 /* Powerdown and powerup Main Pll */
 111                 pllctl_reg_setbits(data->pll, secctl, SECCTL_BYPASS_MASK);
 112                 pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLPWRDN_MASK);
 113                 /* 5 micro sec */
 114                 sdelay(21000);
 115
 116                 pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLPWRDN_MASK);
 117         } else {
 118                 bypass_main_pll(data);
 119         }
 120
 121         configure_mult_div(data);
 122
 123         /* Program Output Divider */
 124         pllctl_reg_rmw(data->pll, secctl, SECCTL_OP_DIV_MASK,
 125                        ((pllod << SECCTL_OP_DIV_SHIFT) & SECCTL_OP_DIV_MASK));
 126
 127         /* Program PLLDIVn */
 128         wait_for_completion(data);
 129         for (i = 0; i < PLLDIV_MAX; i++) {
 130                 if (i < 3)
 131                         offset = pllctl_reg(data->pll, div1) + i;
 132                 else
 133                         offset = pllctl_reg(data->pll, div4) + (i - 3);
 134
 135                 if (divn_val[i] != -1) {
 136                         __raw_writel(divn_val[i] | PLLDIV_ENABLE_MASK, offset);
 137                         alnctl_val |= BIT(i);
 138                 }
 139         }
 140
 141         if (alnctl_val) {
 142                 pllctl_reg_setbits(data->pll, alnctl, alnctl_val);
 143                 /*
 144                  * Set GOSET bit in PLLCMD to initiate the GO operation
 145                  * to change the divide
 146                  */
 147                 pllctl_reg_setbits(data->pll, cmd, PLLSTAT_GOSTAT_MASK);
 148                 wait_for_completion(data);
 149         }
 150
 151         /* Reset PLL */
 152         pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLRST_MASK);
 153         sdelay(21000);  /* Wait for a minimum of 7 us*/
 154         pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLRST_MASK);
 155         sdelay(105000); /* Wait for PLL Lock time (min 50 us) */
 156
 157         /* Enable PLL */
 158         pllctl_reg_clrbits(data->pll, secctl, SECCTL_BYPASS_MASK);
 159         pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLEN_MASK);
 160 }
 161
 162 void configure_secondary_pll(const struct pll_init_data *data)
 163 {
 164         int pllod = data->pll_od - 1;
 165
 166         /* Enable Bypass mode */
 167         setbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_ENSAT_MASK);
 168         setbits_le32(keystone_pll_regs[data->pll].reg0,
 169                      CFG_PLLCTL0_BYPASS_MASK);
 170
 171         /* Enable Glitch free bypass for ARM PLL */
 172         if (cpu_is_k2hk() && data->pll == TETRIS_PLL)
 173                 clrbits_le32(KS2_MISC_CTRL, MISC_CTL1_ARM_PLL_EN);
 174
 175         configure_mult_div(data);
 176
 177         /* Program Output Divider */
 178         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
 179                         CFG_PLLCTL0_CLKOD_MASK,
 180                         (pllod << CFG_PLLCTL0_CLKOD_SHIFT) &
 181                         CFG_PLLCTL0_CLKOD_MASK);
 182
 183         /* Reset PLL */
 184         setbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_RST_MASK);
 185         /* Wait for 5 micro seconds */
 186         sdelay(21000);
 187
 188         /* Select the Output of PASS PLL as input to PASS */
 189         if (data->pll == PASS_PLL && cpu_is_k2hk())
 190                 pll_pa_clk_sel();
 191
 192         /* Select the Output of ARM PLL as input to ARM */
 193         if (data->pll == TETRIS_PLL)
 194                 setbits_le32(KS2_MISC_CTRL, MISC_CTL1_ARM_PLL_EN);
 195
 196         clrbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_RST_MASK);
 197         /* Wait for 500 * REFCLK cucles * (PLLD + 1) */
 198         sdelay(105000);
 199
 200         /* Switch to PLL mode */
 201         clrbits_le32(keystone_pll_regs[data->pll].reg0,
 202                      CFG_PLLCTL0_BYPASS_MASK);
 203 }
 204
 205 void init_pll(const struct pll_init_data *data)
 206 {
 207         if (data->pll == MAIN_PLL)
 208                 configure_main_pll(data);
 209         else
 210                 configure_secondary_pll(data);
 211
 212         /*
 213          * This is required to provide a delay between multiple
 214          * consequent PPL configurations
 215          */
 216         sdelay(210000);
 217 }
 218
 219 void init_plls(void)
 220 {
 221         struct pll_init_data *data;
 222         int pll;
 223
 224         for (pll = MAIN_PLL; pll < MAX_PLL_COUNT; pll++) {
 225                 data = get_pll_init_data(pll);
 226                 if (data)
 227                         init_pll(data);
 228         }
 229 }
 230
 231 static int get_max_speed(u32 val, u32 speed_supported)
 232 {
 233         int speed;
 234
 235         /* Left most setbit gives the speed */
 236         for (speed = DEVSPEED_NUMSPDS; speed >= 0; speed--) {
 237                 if ((val & BIT(speed)) & speed_supported)
 238                         return speeds[speed];
 239         }
 240
 241         /* If no bit is set, use SPD800 */
 242         return SPD800;
 243 }
 244
 245 static inline u32 read_efuse_bootrom(void)
 246 {
 247         if (cpu_is_k2hk() && (cpu_revision() <= 1))
 248                 return __raw_readl(KS2_REV1_DEVSPEED);
 249         else
 250                 return __raw_readl(KS2_EFUSE_BOOTROM);
 251 }
 252
 253 int get_max_arm_speed(void)
 254 {
 255         u32 armspeed = read_efuse_bootrom();
 256
 257         armspeed = (armspeed & DEVSPEED_ARMSPEED_MASK) >>
 258                     DEVSPEED_ARMSPEED_SHIFT;
 259
 260         return get_max_speed(armspeed, ARM_SUPPORTED_SPEEDS);
 261 }
 262
 263 int get_max_dev_speed(void)
 264 {
 265         u32 devspeed = read_efuse_bootrom();
 266
 267         devspeed = (devspeed & DEVSPEED_DEVSPEED_MASK) >>
 268                     DEVSPEED_DEVSPEED_SHIFT;
 269
 270         return get_max_speed(devspeed, DEV_SUPPORTED_SPEEDS);
 271 }
 272
 273 /**
 274  * pll_freq_get - get pll frequency
 275  * @pll:        pll identifier
 276  */
 277 static unsigned long pll_freq_get(int pll)
 278 {
 279         unsigned long mult = 1, prediv = 1, output_div = 2;
 280         unsigned long ret;
 281         u32 tmp, reg;
 282
 283         if (pll == MAIN_PLL) {
 284                 ret = external_clk[sys_clk];
 285                 if (pllctl_reg_read(pll, ctl) & PLLCTL_PLLEN_MASK) {
 286                         /* PLL mode */
 287                         tmp = __raw_readl(KS2_MAINPLLCTL0);
 288                         prediv = (tmp & CFG_PLLCTL0_PLLD_MASK) + 1;
 289                         mult = ((tmp & CFG_PLLCTL0_PLLM_HI_MASK) >>
 290                                 CFG_PLLCTL0_PLLM_SHIFT |
 291                                 (pllctl_reg_read(pll, mult) &
 292                                  PLLM_MULT_LO_MASK)) + 1;
 293                         output_div = ((pllctl_reg_read(pll, secctl) &
 294                                        SECCTL_OP_DIV_MASK) >>
 295                                        SECCTL_OP_DIV_SHIFT) + 1;
 296
 297                         ret = ret / prediv / output_div * mult;
 298                 }
 299         } else {
 300                 switch (pll) {
 301                 case PASS_PLL:
 302                         ret = external_clk[pa_clk];
 303                         reg = KS2_PASSPLLCTL0;
 304                         break;
 305                 case TETRIS_PLL:
 306                         ret = external_clk[tetris_clk];
 307                         reg = KS2_ARMPLLCTL0;
 308                         break;
 309                 case DDR3A_PLL:
 310                         ret = external_clk[ddr3a_clk];
 311                         reg = KS2_DDR3APLLCTL0;
 312                         break;
 313                 case DDR3B_PLL:
 314                         ret = external_clk[ddr3b_clk];
 315                         reg = KS2_DDR3BPLLCTL0;
 316                         break;
 317                 case UART_PLL:
 318                         ret = external_clk[uart_clk];
 319                         reg = KS2_UARTPLLCTL0;
 320                         break;
 321                 default:
 322                         return 0;
 323                 }
 324
 325                 tmp = __raw_readl(reg);
 326
 327                 if (!(tmp & CFG_PLLCTL0_BYPASS_MASK)) {
 328                         /* Bypass disabled */
 329                         prediv = (tmp & CFG_PLLCTL0_PLLD_MASK) + 1;
 330                         mult = ((tmp & CFG_PLLCTL0_PLLM_MASK) >>
 331                                 CFG_PLLCTL0_PLLM_SHIFT) + 1;
 332                         output_div = ((tmp & CFG_PLLCTL0_CLKOD_MASK) >>
 333                                       CFG_PLLCTL0_CLKOD_SHIFT) + 1;
 334                         ret = ((ret / prediv) * mult) / output_div;
 335                 }
 336         }
 337
 338         return ret;
 339 }
 340
 341 unsigned long clk_get_rate(unsigned int clk)
 342 {
 343         unsigned long freq = 0;
 344
 345         switch (clk) {
 346         case core_pll_clk:
 347                 freq = pll_freq_get(CORE_PLL);
 348                 break;
 349         case pass_pll_clk:
 350                 freq = pll_freq_get(PASS_PLL);
 351                 break;
 352         case tetris_pll_clk:
 353                 if (!cpu_is_k2e())
 354                         freq = pll_freq_get(TETRIS_PLL);
 355                 break;
 356         case ddr3a_pll_clk:
 357                 freq = pll_freq_get(DDR3A_PLL);
 358                 break;
 359         case ddr3b_pll_clk:
 360                 if (cpu_is_k2hk())
 361                         freq = pll_freq_get(DDR3B_PLL);
 362                 break;
 363         case sys_clk0_1_clk:
 364         case sys_clk0_clk:
 365                 freq = pll_freq_get(CORE_PLL) / pll0div_read(1);
 366                 break;
 367         case sys_clk1_clk:
 368         return pll_freq_get(CORE_PLL) / pll0div_read(2);
 369                 break;
 370         case sys_clk2_clk:
 371                 freq = pll_freq_get(CORE_PLL) / pll0div_read(3);
 372                 break;
 373         case sys_clk3_clk:
 374                 freq = pll_freq_get(CORE_PLL) / pll0div_read(4);
 375                 break;
 376         case sys_clk0_2_clk:
 377                 freq = clk_get_rate(sys_clk0_clk) / 2;
 378                 break;
 379         case sys_clk0_3_clk:
 380                 freq = clk_get_rate(sys_clk0_clk) / 3;
 381                 break;
 382         case sys_clk0_4_clk:
 383                 freq = clk_get_rate(sys_clk0_clk) / 4;
 384                 break;
 385         case sys_clk0_6_clk:
 386                 freq = clk_get_rate(sys_clk0_clk) / 6;
 387                 break;
 388         case sys_clk0_8_clk:
 389                 freq = clk_get_rate(sys_clk0_clk) / 8;
 390                 break;
 391         case sys_clk0_12_clk:
 392                 freq = clk_get_rate(sys_clk0_clk) / 12;
 393                 break;
 394         case sys_clk0_24_clk:
 395                 freq = clk_get_rate(sys_clk0_clk) / 24;
 396                 break;
 397         case sys_clk1_3_clk:
 398                 freq = clk_get_rate(sys_clk1_clk) / 3;
 399                 break;
 400         case sys_clk1_4_clk:
 401                 freq = clk_get_rate(sys_clk1_clk) / 4;
 402                 break;
 403         case sys_clk1_6_clk:
 404                 freq = clk_get_rate(sys_clk1_clk) / 6;
 405                 break;
 406         case sys_clk1_12_clk:
 407                 freq = clk_get_rate(sys_clk1_clk) / 12;
 408                 break;
 409         default:
 410                 break;
 411         }
 412
 413         return freq;
 414 }