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 };
  35
  36 static void wait_for_completion(const struct pll_init_data *data)
  37 {
  38         int i;
  39         for (i = 0; i < 100; i++) {
  40                 sdelay(450);
  41                 if (!(pllctl_reg_read(data->pll, stat) & PLLSTAT_GOSTAT_MASK))
  42                         break;
  43         }
  44 }
  45
  46 static inline void bypass_main_pll(const struct pll_init_data *data)
  47 {
  48         pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLENSRC_MASK |
  49                            PLLCTL_PLLEN_MASK);
  50
  51         /* 4 cycles of reference clock CLKIN*/
  52         sdelay(340);
  53 }
  54
  55 static void configure_mult_div(const struct pll_init_data *data)
  56 {
  57         u32 pllm, plld, bwadj;
  58
  59         pllm = data->pll_m - 1;
  60         plld = (data->pll_d - 1) & CFG_PLLCTL0_PLLD_MASK;
  61
  62         /* Program Multiplier */
  63         if (data->pll == MAIN_PLL)
  64                 pllctl_reg_write(data->pll, mult, pllm & PLLM_MULT_LO_MASK);
  65
  66         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
  67                         CFG_PLLCTL0_PLLM_MASK,
  68                         pllm << CFG_PLLCTL0_PLLM_SHIFT);
  69
  70         /* Program BWADJ */
  71         bwadj = (data->pll_m - 1) >> 1; /* Divide pllm by 2 */
  72         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
  73                         CFG_PLLCTL0_BWADJ_MASK,
  74                         (bwadj << CFG_PLLCTL0_BWADJ_SHIFT) &
  75                         CFG_PLLCTL0_BWADJ_MASK);
  76         bwadj = bwadj >> CFG_PLLCTL0_BWADJ_BITS;
  77         clrsetbits_le32(keystone_pll_regs[data->pll].reg1,
  78                         CFG_PLLCTL1_BWADJ_MASK, bwadj);
  79
  80         /* Program Divider */
  81         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
  82                         CFG_PLLCTL0_PLLD_MASK, plld);
  83 }
  84
  85 void configure_main_pll(const struct pll_init_data *data)
  86 {
  87         u32 tmp, pllod, i, alnctl_val = 0;
  88         u32 *offset;
  89
  90         pllod = data->pll_od - 1;
  91
  92         /* 100 micro sec for stabilization */
  93         sdelay(210000);
  94
  95         tmp = pllctl_reg_read(data->pll, secctl);
  96
  97         /* Check for Bypass */
  98         if (tmp & SECCTL_BYPASS_MASK) {
  99                 setbits_le32(keystone_pll_regs[data->pll].reg1,
 100                              CFG_PLLCTL1_ENSAT_MASK);
 101
 102                 bypass_main_pll(data);
 103
 104                 /* Powerdown and powerup Main Pll */
 105                 pllctl_reg_setbits(data->pll, secctl, SECCTL_BYPASS_MASK);
 106                 pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLPWRDN_MASK);
 107                 /* 5 micro sec */
 108                 sdelay(21000);
 109
 110                 pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLPWRDN_MASK);
 111         } else {
 112                 bypass_main_pll(data);
 113         }
 114
 115         configure_mult_div(data);
 116
 117         /* Program Output Divider */
 118         pllctl_reg_rmw(data->pll, secctl, SECCTL_OP_DIV_MASK,
 119                        ((pllod << SECCTL_OP_DIV_SHIFT) & SECCTL_OP_DIV_MASK));
 120
 121         /* Program PLLDIVn */
 122         wait_for_completion(data);
 123         for (i = 0; i < PLLDIV_MAX; i++) {
 124                 if (i < 3)
 125                         offset = pllctl_reg(data->pll, div1) + i;
 126                 else
 127                         offset = pllctl_reg(data->pll, div4) + (i - 3);
 128
 129                 if (divn_val[i] != -1) {
 130                         __raw_writel(divn_val[i] | PLLDIV_ENABLE_MASK, offset);
 131                         alnctl_val |= BIT(i);
 132                 }
 133         }
 134
 135         if (alnctl_val) {
 136                 pllctl_reg_setbits(data->pll, alnctl, alnctl_val);
 137                 /*
 138                  * Set GOSET bit in PLLCMD to initiate the GO operation
 139                  * to change the divide
 140                  */
 141                 pllctl_reg_setbits(data->pll, cmd, PLLSTAT_GOSTAT_MASK);
 142                 wait_for_completion(data);
 143         }
 144
 145         /* Reset PLL */
 146         pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLRST_MASK);
 147         sdelay(21000);  /* Wait for a minimum of 7 us*/
 148         pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLRST_MASK);
 149         sdelay(105000); /* Wait for PLL Lock time (min 50 us) */
 150
 151         /* Enable PLL */
 152         pllctl_reg_clrbits(data->pll, secctl, SECCTL_BYPASS_MASK);
 153         pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLEN_MASK);
 154 }
 155
 156 void configure_secondary_pll(const struct pll_init_data *data)
 157 {
 158         int pllod = data->pll_od - 1;
 159
 160         /* Enable Bypass mode */
 161         setbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_ENSAT_MASK);
 162         setbits_le32(keystone_pll_regs[data->pll].reg0,
 163                      CFG_PLLCTL0_BYPASS_MASK);
 164
 165         /* Enable Glitch free bypass for ARM PLL */
 166         if (cpu_is_k2hk() && data->pll == TETRIS_PLL)
 167                 clrbits_le32(KS2_MISC_CTRL, MISC_CTL1_ARM_PLL_EN);
 168
 169         configure_mult_div(data);
 170
 171         /* Program Output Divider */
 172         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
 173                         CFG_PLLCTL0_CLKOD_MASK,
 174                         (pllod << CFG_PLLCTL0_CLKOD_SHIFT) &
 175                         CFG_PLLCTL0_CLKOD_MASK);
 176
 177         /* Reset PLL */
 178         setbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_RST_MASK);
 179         /* Wait for 5 micro seconds */
 180         sdelay(21000);
 181
 182         /* Select the Output of PASS PLL as input to PASS */
 183         if (data->pll == PASS_PLL)
 184                 setbits_le32(keystone_pll_regs[data->pll].reg1,
 185                              CFG_PLLCTL1_PAPLL_MASK);
 186
 187         /* Select the Output of ARM PLL as input to ARM */
 188         if (data->pll == TETRIS_PLL)
 189                 setbits_le32(KS2_MISC_CTRL, MISC_CTL1_ARM_PLL_EN);
 190
 191         clrbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_RST_MASK);
 192         /* Wait for 500 * REFCLK cucles * (PLLD + 1) */
 193         sdelay(105000);
 194
 195         /* Switch to PLL mode */
 196         clrbits_le32(keystone_pll_regs[data->pll].reg0,
 197                      CFG_PLLCTL0_BYPASS_MASK);
 198 }
 199
 200 void init_pll(const struct pll_init_data *data)
 201 {
 202         if (data->pll == MAIN_PLL)
 203                 configure_main_pll(data);
 204         else
 205                 configure_secondary_pll(data);
 206
 207         /*
 208          * This is required to provide a delay between multiple
 209          * consequent PPL configurations
 210          */
 211         sdelay(210000);
 212 }
 213
 214 void init_plls(void)
 215 {
 216         struct pll_init_data *data;
 217         int pll;
 218
 219         for (pll = MAIN_PLL; pll < MAX_PLL_COUNT; pll++) {
 220                 data = get_pll_init_data(pll);
 221                 if (data)
 222                         init_pll(data);
 223         }
 224 }
 225
 226 static int get_max_speed(u32 val, u32 speed_supported)
 227 {
 228         int speed;
 229
 230         /* Left most setbit gives the speed */
 231         for (speed = DEVSPEED_NUMSPDS; speed >= 0; speed--) {
 232                 if ((val & BIT(speed)) & speed_supported)
 233                         return speeds[speed];
 234         }
 235
 236         /* If no bit is set, use SPD800 */
 237         return SPD800;
 238 }
 239
 240 static inline u32 read_efuse_bootrom(void)
 241 {
 242         if (cpu_is_k2hk() && (cpu_revision() <= 1))
 243                 return __raw_readl(KS2_REV1_DEVSPEED);
 244         else
 245                 return __raw_readl(KS2_EFUSE_BOOTROM);
 246 }
 247
 248 int get_max_arm_speed(void)
 249 {
 250         u32 armspeed = read_efuse_bootrom();
 251
 252         armspeed = (armspeed & DEVSPEED_ARMSPEED_MASK) >>
 253                     DEVSPEED_ARMSPEED_SHIFT;
 254
 255         return get_max_speed(armspeed, ARM_SUPPORTED_SPEEDS);
 256 }
 257
 258 int get_max_dev_speed(void)
 259 {
 260         u32 devspeed = read_efuse_bootrom();
 261
 262         devspeed = (devspeed & DEVSPEED_DEVSPEED_MASK) >>
 263                     DEVSPEED_DEVSPEED_SHIFT;
 264
 265         return get_max_speed(devspeed, DEV_SUPPORTED_SPEEDS);
 266 }