3 * Kamil Lulko, <kamil.lulko@gmail.com>
8 * SPDX-License-Identifier: GPL-2.0+
13 #include <asm/arch/stm32.h>
15 #define RCC_CR_HSION (1 << 0)
16 #define RCC_CR_HSEON (1 << 16)
17 #define RCC_CR_HSERDY (1 << 17)
18 #define RCC_CR_HSEBYP (1 << 18)
19 #define RCC_CR_CSSON (1 << 19)
20 #define RCC_CR_PLLON (1 << 24)
21 #define RCC_CR_PLLRDY (1 << 25)
23 #define RCC_PLLCFGR_PLLM_MASK 0x3F
24 #define RCC_PLLCFGR_PLLN_MASK 0x7FC0
25 #define RCC_PLLCFGR_PLLP_MASK 0x30000
26 #define RCC_PLLCFGR_PLLQ_MASK 0xF000000
27 #define RCC_PLLCFGR_PLLSRC (1 << 22)
28 #define RCC_PLLCFGR_PLLN_SHIFT 6
29 #define RCC_PLLCFGR_PLLP_SHIFT 16
30 #define RCC_PLLCFGR_PLLQ_SHIFT 24
32 #define RCC_CFGR_AHB_PSC_MASK 0xF0
33 #define RCC_CFGR_APB1_PSC_MASK 0x1C00
34 #define RCC_CFGR_APB2_PSC_MASK 0xE000
35 #define RCC_CFGR_SW0 (1 << 0)
36 #define RCC_CFGR_SW1 (1 << 1)
37 #define RCC_CFGR_SW_MASK 0x3
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 (1 << 2)
42 #define RCC_CFGR_SWS1 (1 << 3)
43 #define RCC_CFGR_SWS_MASK 0xC
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
51 #define RCC_APB1ENR_PWREN (1 << 28)
53 #define PWR_CR_VOS0 (1 << 14)
54 #define PWR_CR_VOS1 (1 << 15)
55 #define PWR_CR_VOS_MASK 0xC000
56 #define PWR_CR_VOS_SCALE_MODE_1 (PWR_CR_VOS0 | PWR_CR_VOS1)
57 #define PWR_CR_VOS_SCALE_MODE_2 (PWR_CR_VOS1)
58 #define PWR_CR_VOS_SCALE_MODE_3 (PWR_CR_VOS0)
60 #define FLASH_ACR_WS(n) n
61 #define FLASH_ACR_PRFTEN (1 << 8)
62 #define FLASH_ACR_ICEN (1 << 9)
63 #define FLASH_ACR_DCEN (1 << 10)
79 #define AHB_PSC_16 0xB
80 #define AHB_PSC_64 0xC
81 #define AHB_PSC_128 0xD
82 #define AHB_PSC_256 0xE
83 #define AHB_PSC_512 0xF
89 #define APB_PSC_16 0x7
91 #if !defined(CONFIG_STM32_HSE_HZ)
92 #error "CONFIG_STM32_HSE_HZ not defined!"
94 #if (CONFIG_STM32_HSE_HZ == 8000000)
95 #if (CONFIG_SYS_CLK_FREQ == 180000000)
97 struct pll_psc sys_pll_psc = {
102 .ahb_psc = AHB_PSC_1,
103 .apb1_psc = APB_PSC_4,
104 .apb2_psc = APB_PSC_2
107 /* default 168 MHz */
108 struct pll_psc sys_pll_psc = {
113 .ahb_psc = AHB_PSC_1,
114 .apb1_psc = APB_PSC_4,
115 .apb2_psc = APB_PSC_2
119 #error "No PLL/Prescaler configuration for given CONFIG_STM32_HSE_HZ exists"
123 int configure_clocks(void)
125 /* Reset RCC configuration */
126 setbits_le32(&STM32_RCC->cr, RCC_CR_HSION);
127 writel(0, &STM32_RCC->cfgr); /* Reset CFGR */
128 clrbits_le32(&STM32_RCC->cr, (RCC_CR_HSEON | RCC_CR_CSSON
130 writel(0x24003010, &STM32_RCC->pllcfgr); /* Reset value from RM */
131 clrbits_le32(&STM32_RCC->cr, RCC_CR_HSEBYP);
132 writel(0, &STM32_RCC->cir); /* Disable all interrupts */
134 /* Configure for HSE+PLL operation */
135 setbits_le32(&STM32_RCC->cr, RCC_CR_HSEON);
136 while (!(readl(&STM32_RCC->cr) & RCC_CR_HSERDY))
139 /* Enable high performance mode, System frequency up to 180 MHz */
140 setbits_le32(&STM32_RCC->apb1enr, RCC_APB1ENR_PWREN);
141 writel(PWR_CR_VOS_SCALE_MODE_1, &STM32_PWR->cr);
143 setbits_le32(&STM32_RCC->cfgr, ((
144 sys_pll_psc.ahb_psc << RCC_CFGR_HPRE_SHIFT)
145 | (sys_pll_psc.apb1_psc << RCC_CFGR_PPRE1_SHIFT)
146 | (sys_pll_psc.apb2_psc << RCC_CFGR_PPRE2_SHIFT)));
148 writel(sys_pll_psc.pll_m
149 | (sys_pll_psc.pll_n << RCC_PLLCFGR_PLLN_SHIFT)
150 | (((sys_pll_psc.pll_p >> 1) - 1) << RCC_PLLCFGR_PLLP_SHIFT)
151 | (sys_pll_psc.pll_q << RCC_PLLCFGR_PLLQ_SHIFT),
152 &STM32_RCC->pllcfgr);
153 setbits_le32(&STM32_RCC->pllcfgr, RCC_PLLCFGR_PLLSRC);
155 setbits_le32(&STM32_RCC->cr, RCC_CR_PLLON);
157 while (!(readl(&STM32_RCC->cr) & RCC_CR_PLLRDY))
160 /* 5 wait states, Prefetch enabled, D-Cache enabled, I-Cache enabled */
161 writel(FLASH_ACR_WS(5) | FLASH_ACR_PRFTEN | FLASH_ACR_ICEN
162 | FLASH_ACR_DCEN, &STM32_FLASH->acr);
164 clrbits_le32(&STM32_RCC->cfgr, (RCC_CFGR_SW0 | RCC_CFGR_SW1));
165 setbits_le32(&STM32_RCC->cfgr, RCC_CFGR_SW_PLL);
167 while ((readl(&STM32_RCC->cfgr) & RCC_CFGR_SWS_MASK) !=
174 unsigned long clock_get(enum clock clck)
178 /* Prescaler table lookups for clock computation */
179 u8 ahb_psc_table[16] = {
180 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9
182 u8 apb_psc_table[8] = {
183 0, 0, 0, 0, 1, 2, 3, 4
186 if ((readl(&STM32_RCC->cfgr) & RCC_CFGR_SWS_MASK) ==
188 u16 pllm, plln, pllp;
189 pllm = (readl(&STM32_RCC->pllcfgr) & RCC_PLLCFGR_PLLM_MASK);
190 plln = ((readl(&STM32_RCC->pllcfgr) & RCC_PLLCFGR_PLLN_MASK)
191 >> RCC_PLLCFGR_PLLN_SHIFT);
192 pllp = ((((readl(&STM32_RCC->pllcfgr) & RCC_PLLCFGR_PLLP_MASK)
193 >> RCC_PLLCFGR_PLLP_SHIFT) + 1) << 1);
194 sysclk = ((CONFIG_STM32_HSE_HZ / pllm) * plln) / pllp;
202 shift = ahb_psc_table[(
203 (readl(&STM32_RCC->cfgr) & RCC_CFGR_AHB_PSC_MASK)
204 >> RCC_CFGR_HPRE_SHIFT)];
205 return sysclk >>= shift;
208 shift = apb_psc_table[(
209 (readl(&STM32_RCC->cfgr) & RCC_CFGR_APB1_PSC_MASK)
210 >> RCC_CFGR_PPRE1_SHIFT)];
211 return sysclk >>= shift;
214 shift = apb_psc_table[(
215 (readl(&STM32_RCC->cfgr) & RCC_CFGR_APB2_PSC_MASK)
216 >> RCC_CFGR_PPRE2_SHIFT)];
217 return sysclk >>= shift;