arch/arm/mach-stm32/stm32f7/clock.c

   1 /*
   2  * (C) Copyright 2016
   3  * Vikas Manocha, <vikas.manocha@st.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <asm/io.h>
  10 #include <asm/arch/rcc.h>
  11 #include <asm/arch/stm32.h>
  12 #include <asm/arch/stm32_periph.h>
  13
  14 #define RCC_CR_HSION                    BIT(0)
  15 #define RCC_CR_HSEON                    BIT(16)
  16 #define RCC_CR_HSERDY                   BIT(17)
  17 #define RCC_CR_HSEBYP                   BIT(18)
  18 #define RCC_CR_CSSON                    BIT(19)
  19 #define RCC_CR_PLLON                    BIT(24)
  20 #define RCC_CR_PLLRDY                   BIT(25)
  21
  22 #define RCC_PLLCFGR_PLLM_MASK           GENMASK(5, 0)
  23 #define RCC_PLLCFGR_PLLN_MASK           GENMASK(14, 6)
  24 #define RCC_PLLCFGR_PLLP_MASK           GENMASK(17, 16)
  25 #define RCC_PLLCFGR_PLLQ_MASK           GENMASK(27, 24)
  26 #define RCC_PLLCFGR_PLLSRC              BIT(22)
  27 #define RCC_PLLCFGR_PLLM_SHIFT          0
  28 #define RCC_PLLCFGR_PLLN_SHIFT          6
  29 #define RCC_PLLCFGR_PLLP_SHIFT          16
  30 #define RCC_PLLCFGR_PLLQ_SHIFT          24
  31
  32 #define RCC_CFGR_AHB_PSC_MASK           GENMASK(7, 4)
  33 #define RCC_CFGR_APB1_PSC_MASK          GENMASK(12, 10)
  34 #define RCC_CFGR_APB2_PSC_MASK          GENMASK(15, 13)
  35 #define RCC_CFGR_SW0                    BIT(0)
  36 #define RCC_CFGR_SW1                    BIT(1)
  37 #define RCC_CFGR_SW_MASK                GENMASK(1, 0)
  38 #define RCC_CFGR_SW_HSI                 0
  39 #define RCC_CFGR_SW_HSE                 RCC_CFGR_SW0
  40 #define RCC_CFGR_SW_PLL                 RCC_CFGR_SW1
  41 #define RCC_CFGR_SWS0                   BIT(2)
  42 #define RCC_CFGR_SWS1                   BIT(3)
  43 #define RCC_CFGR_SWS_MASK               GENMASK(3, 2)
  44 #define RCC_CFGR_SWS_HSI                0
  45 #define RCC_CFGR_SWS_HSE                RCC_CFGR_SWS0
  46 #define RCC_CFGR_SWS_PLL                RCC_CFGR_SWS1
  47 #define RCC_CFGR_HPRE_SHIFT             4
  48 #define RCC_CFGR_PPRE1_SHIFT            10
  49 #define RCC_CFGR_PPRE2_SHIFT            13
  50
  51 /*
  52  * Offsets of some PWR registers
  53  */
  54 #define PWR_CR1_ODEN                    BIT(16)
  55 #define PWR_CR1_ODSWEN                  BIT(17)
  56 #define PWR_CSR1_ODRDY                  BIT(16)
  57 #define PWR_CSR1_ODSWRDY                BIT(17)
  58
  59 struct pll_psc {
  60         u8      pll_m;
  61         u16     pll_n;
  62         u8      pll_p;
  63         u8      pll_q;
  64         u8      ahb_psc;
  65         u8      apb1_psc;
  66         u8      apb2_psc;
  67 };
  68
  69 #define AHB_PSC_1                       0
  70 #define AHB_PSC_2                       0x8
  71 #define AHB_PSC_4                       0x9
  72 #define AHB_PSC_8                       0xA
  73 #define AHB_PSC_16                      0xB
  74 #define AHB_PSC_64                      0xC
  75 #define AHB_PSC_128                     0xD
  76 #define AHB_PSC_256                     0xE
  77 #define AHB_PSC_512                     0xF
  78
  79 #define APB_PSC_1                       0
  80 #define APB_PSC_2                       0x4
  81 #define APB_PSC_4                       0x5
  82 #define APB_PSC_8                       0x6
  83 #define APB_PSC_16                      0x7
  84
  85 #if !defined(CONFIG_STM32_HSE_HZ)
  86 #error "CONFIG_STM32_HSE_HZ not defined!"
  87 #else
  88 #if (CONFIG_STM32_HSE_HZ == 25000000)
  89 #if (CONFIG_SYS_CLK_FREQ == 200000000)
  90 /* 200 MHz */
  91 struct pll_psc sys_pll_psc = {
  92         .pll_m = 25,
  93         .pll_n = 400,
  94         .pll_p = 2,
  95         .pll_q = 8,
  96         .ahb_psc = AHB_PSC_1,
  97         .apb1_psc = APB_PSC_4,
  98         .apb2_psc = APB_PSC_2
  99 };
 100 #endif
 101 #else
 102 #error "No PLL/Prescaler configuration for given CONFIG_STM32_HSE_HZ exists"
 103 #endif
 104 #endif
 105
 106 int configure_clocks(void)
 107 {
 108         /* Reset RCC configuration */
 109         setbits_le32(&STM32_RCC->cr, RCC_CR_HSION);
 110         writel(0, &STM32_RCC->cfgr); /* Reset CFGR */
 111         clrbits_le32(&STM32_RCC->cr, (RCC_CR_HSEON | RCC_CR_CSSON
 112                 | RCC_CR_PLLON));
 113         writel(0x24003010, &STM32_RCC->pllcfgr); /* Reset value from RM */
 114         clrbits_le32(&STM32_RCC->cr, RCC_CR_HSEBYP);
 115         writel(0, &STM32_RCC->cir); /* Disable all interrupts */
 116
 117         /* Configure for HSE+PLL operation */
 118         setbits_le32(&STM32_RCC->cr, RCC_CR_HSEON);
 119         while (!(readl(&STM32_RCC->cr) & RCC_CR_HSERDY))
 120                 ;
 121
 122         setbits_le32(&STM32_RCC->cfgr, ((
 123                 sys_pll_psc.ahb_psc << RCC_CFGR_HPRE_SHIFT)
 124                 | (sys_pll_psc.apb1_psc << RCC_CFGR_PPRE1_SHIFT)
 125                 | (sys_pll_psc.apb2_psc << RCC_CFGR_PPRE2_SHIFT)));
 126
 127         /* Configure the main PLL */
 128         uint32_t pllcfgr = 0;
 129         pllcfgr = RCC_PLLCFGR_PLLSRC; /* pll source HSE */
 130         pllcfgr |= sys_pll_psc.pll_m << RCC_PLLCFGR_PLLM_SHIFT;
 131         pllcfgr |= sys_pll_psc.pll_n << RCC_PLLCFGR_PLLN_SHIFT;
 132         pllcfgr |= ((sys_pll_psc.pll_p >> 1) - 1) << RCC_PLLCFGR_PLLP_SHIFT;
 133         pllcfgr |= sys_pll_psc.pll_q << RCC_PLLCFGR_PLLQ_SHIFT;
 134         writel(pllcfgr, &STM32_RCC->pllcfgr);
 135
 136         /* Enable the main PLL */
 137         setbits_le32(&STM32_RCC->cr, RCC_CR_PLLON);
 138         while (!(readl(&STM32_RCC->cr) & RCC_CR_PLLRDY))
 139                 ;
 140
 141         /* Enable high performance mode, System frequency up to 200 MHz */
 142         setbits_le32(&STM32_RCC->apb1enr, RCC_APB1ENR_PWREN);
 143         setbits_le32(&STM32_PWR->cr1, PWR_CR1_ODEN);
 144         /* Infinite wait! */
 145         while (!(readl(&STM32_PWR->csr1) & PWR_CSR1_ODRDY))
 146                 ;
 147         /* Enable the Over-drive switch */
 148         setbits_le32(&STM32_PWR->cr1, PWR_CR1_ODSWEN);
 149         /* Infinite wait! */
 150         while (!(readl(&STM32_PWR->csr1) & PWR_CSR1_ODSWRDY))
 151                 ;
 152
 153         stm32_flash_latency_cfg(5);
 154         clrbits_le32(&STM32_RCC->cfgr, (RCC_CFGR_SW0 | RCC_CFGR_SW1));
 155         setbits_le32(&STM32_RCC->cfgr, RCC_CFGR_SW_PLL);
 156
 157         while ((readl(&STM32_RCC->cfgr) & RCC_CFGR_SWS_MASK) !=
 158                         RCC_CFGR_SWS_PLL)
 159                 ;
 160
 161         return 0;
 162 }
 163
 164 unsigned long clock_get(enum clock clck)
 165 {
 166         u32 sysclk = 0;
 167         u32 shift = 0;
 168         /* Prescaler table lookups for clock computation */
 169         u8 ahb_psc_table[16] = {
 170                 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9
 171         };
 172         u8 apb_psc_table[8] = {
 173                 0, 0, 0, 0, 1, 2, 3, 4
 174         };
 175
 176         if ((readl(&STM32_RCC->cfgr) & RCC_CFGR_SWS_MASK) ==
 177                         RCC_CFGR_SWS_PLL) {
 178                 u16 pllm, plln, pllp;
 179                 pllm = (readl(&STM32_RCC->pllcfgr) & RCC_PLLCFGR_PLLM_MASK);
 180                 plln = ((readl(&STM32_RCC->pllcfgr) & RCC_PLLCFGR_PLLN_MASK)
 181                         >> RCC_PLLCFGR_PLLN_SHIFT);
 182                 pllp = ((((readl(&STM32_RCC->pllcfgr) & RCC_PLLCFGR_PLLP_MASK)
 183                         >> RCC_PLLCFGR_PLLP_SHIFT) + 1) << 1);
 184                 sysclk = ((CONFIG_STM32_HSE_HZ / pllm) * plln) / pllp;
 185         }
 186
 187         switch (clck) {
 188         case CLOCK_CORE:
 189                 return sysclk;
 190                 break;
 191         case CLOCK_AHB:
 192                 shift = ahb_psc_table[(
 193                         (readl(&STM32_RCC->cfgr) & RCC_CFGR_AHB_PSC_MASK)
 194                         >> RCC_CFGR_HPRE_SHIFT)];
 195                 return sysclk >>= shift;
 196                 break;
 197         case CLOCK_APB1:
 198                 shift = apb_psc_table[(
 199                         (readl(&STM32_RCC->cfgr) & RCC_CFGR_APB1_PSC_MASK)
 200                         >> RCC_CFGR_PPRE1_SHIFT)];
 201                 return sysclk >>= shift;
 202                 break;
 203         case CLOCK_APB2:
 204                 shift = apb_psc_table[(
 205                         (readl(&STM32_RCC->cfgr) & RCC_CFGR_APB2_PSC_MASK)
 206                         >> RCC_CFGR_PPRE2_SHIFT)];
 207                 return sysclk >>= shift;
 208                 break;
 209         default:
 210                 return 0;
 211                 break;
 212         }
 213 }
 214
 215
 216 void clock_setup(int peripheral)
 217 {
 218         switch (peripheral) {
 219         case USART1_CLOCK_CFG:
 220                 setbits_le32(&STM32_RCC->apb2enr, RCC_APB2ENR_USART1EN);
 221                 break;
 222         case GPIO_A_CLOCK_CFG:
 223                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_A_EN);
 224                 break;
 225         case GPIO_B_CLOCK_CFG:
 226                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_B_EN);
 227                 break;
 228         case GPIO_C_CLOCK_CFG:
 229                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_C_EN);
 230                 break;
 231         case GPIO_D_CLOCK_CFG:
 232                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_D_EN);
 233                 break;
 234         case GPIO_E_CLOCK_CFG:
 235                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_E_EN);
 236                 break;
 237         case GPIO_F_CLOCK_CFG:
 238                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_F_EN);
 239                 break;
 240         case GPIO_G_CLOCK_CFG:
 241                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_G_EN);
 242                 break;
 243         case GPIO_H_CLOCK_CFG:
 244                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_H_EN);
 245                 break;
 246         case GPIO_I_CLOCK_CFG:
 247                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_I_EN);
 248                 break;
 249         case GPIO_J_CLOCK_CFG:
 250                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_J_EN);
 251                 break;
 252         case GPIO_K_CLOCK_CFG:
 253                 setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_GPIO_K_EN);
 254                 break;
 255         case SYSCFG_CLOCK_CFG:
 256                 setbits_le32(&STM32_RCC->apb2enr, RCC_APB2ENR_SYSCFGEN);
 257                 break;
 258         case TIMER2_CLOCK_CFG:
 259                 setbits_le32(&STM32_RCC->apb1enr, RCC_APB1ENR_TIM2EN);
 260                 break;
 261         case FMC_CLOCK_CFG:
 262                 setbits_le32(&STM32_RCC->ahb3enr, RCC_AHB3ENR_FMC_EN);
 263                 break;
 264         default:
 265                 break;
 266         }
 267 }