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/*
* (C) Copyright 2015
* Kamil Lulko, <kamil.lulko@gmail.com>
*
* Copyright 2015 ATS Advanced Telematics Systems GmbH
* Copyright 2015 Konsulko Group, Matt Porter <mporter@konsulko.com>
*
* (C) Copyright 2014
* STMicroelectronics
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/stm32.h>
#define RCC_CR_HSION (1 << 0)
#define RCC_CR_HSEON (1 << 16)
#define RCC_CR_HSERDY (1 << 17)
#define RCC_CR_HSEBYP (1 << 18)
#define RCC_CR_CSSON (1 << 19)
#define RCC_CR_PLLON (1 << 24)
#define RCC_CR_PLLRDY (1 << 25)
#define RCC_CFGR_PLLMUL_MASK 0x3C0000
#define RCC_CFGR_PLLMUL_SHIFT 18
#define RCC_CFGR_PLLSRC_HSE (1 << 16)
#define RCC_CFGR_AHB_PSC_MASK 0xF0
#define RCC_CFGR_APB1_PSC_MASK 0x700
#define RCC_CFGR_APB2_PSC_MASK 0x3800
#define RCC_CFGR_SW0 (1 << 0)
#define RCC_CFGR_SW1 (1 << 1)
#define RCC_CFGR_SW_MASK 0x3
#define RCC_CFGR_SW_HSI 0
#define RCC_CFGR_SW_HSE RCC_CFGR_SW0
#define RCC_CFGR_SW_PLL RCC_CFGR_SW1
#define RCC_CFGR_SWS0 (1 << 2)
#define RCC_CFGR_SWS1 (1 << 3)
#define RCC_CFGR_SWS_MASK 0xC
#define RCC_CFGR_SWS_HSI 0
#define RCC_CFGR_SWS_HSE RCC_CFGR_SWS0
#define RCC_CFGR_SWS_PLL RCC_CFGR_SWS1
#define RCC_CFGR_HPRE_SHIFT 4
#define RCC_CFGR_PPRE1_SHIFT 8
#define RCC_CFGR_PPRE2_SHIFT 11
#define RCC_APB1ENR_PWREN (1 << 28)
#define PWR_CR_VOS0 (1 << 14)
#define PWR_CR_VOS1 (1 << 15)
#define PWR_CR_VOS_MASK 0xC000
#define PWR_CR_VOS_SCALE_MODE_1 (PWR_CR_VOS0 | PWR_CR_VOS1)
#define PWR_CR_VOS_SCALE_MODE_2 (PWR_CR_VOS1)
#define PWR_CR_VOS_SCALE_MODE_3 (PWR_CR_VOS0)
#define FLASH_ACR_WS(n) n
#define FLASH_ACR_PRFTEN (1 << 8)
#define FLASH_ACR_ICEN (1 << 9)
#define FLASH_ACR_DCEN (1 << 10)
struct psc {
u8 ahb_psc;
u8 apb1_psc;
u8 apb2_psc;
};
#define AHB_PSC_1 0
#define AHB_PSC_2 0x8
#define AHB_PSC_4 0x9
#define AHB_PSC_8 0xA
#define AHB_PSC_16 0xB
#define AHB_PSC_64 0xC
#define AHB_PSC_128 0xD
#define AHB_PSC_256 0xE
#define AHB_PSC_512 0xF
#define APB_PSC_1 0
#define APB_PSC_2 0x4
#define APB_PSC_4 0x5
#define APB_PSC_8 0x6
#define APB_PSC_16 0x7
#if !defined(CONFIG_STM32_HSE_HZ)
#error "CONFIG_STM32_HSE_HZ not defined!"
#else
#if (CONFIG_STM32_HSE_HZ == 8000000)
#define RCC_CFGR_PLLMUL_CFG 0x7
struct psc psc_hse = {
.ahb_psc = AHB_PSC_1,
.apb1_psc = APB_PSC_2,
.apb2_psc = APB_PSC_1
};
#else
#error "No PLL/Prescaler configuration for given CONFIG_STM32_HSE_HZ exists"
#endif
#endif
int configure_clocks(void)
{
/* Reset RCC configuration */
setbits_le32(&STM32_RCC->cr, RCC_CR_HSION);
writel(0, &STM32_RCC->cfgr); /* Reset CFGR */
clrbits_le32(&STM32_RCC->cr, (RCC_CR_HSEON | RCC_CR_CSSON
| RCC_CR_PLLON));
clrbits_le32(&STM32_RCC->cr, RCC_CR_HSEBYP);
writel(0, &STM32_RCC->cir); /* Disable all interrupts */
/* Configure for HSE+PLL operation */
setbits_le32(&STM32_RCC->cr, RCC_CR_HSEON);
while (!(readl(&STM32_RCC->cr) & RCC_CR_HSERDY))
;
/* Enable high performance mode, System frequency up to 168 MHz */
setbits_le32(&STM32_RCC->apb1enr, RCC_APB1ENR_PWREN);
writel(PWR_CR_VOS_SCALE_MODE_1, &STM32_PWR->cr);
setbits_le32(&STM32_RCC->cfgr,
RCC_CFGR_PLLMUL_CFG << RCC_CFGR_PLLMUL_SHIFT);
setbits_le32(&STM32_RCC->cfgr, RCC_CFGR_PLLSRC_HSE);
setbits_le32(&STM32_RCC->cfgr, ((
psc_hse.ahb_psc << RCC_CFGR_HPRE_SHIFT)
| (psc_hse.apb1_psc << RCC_CFGR_PPRE1_SHIFT)
| (psc_hse.apb2_psc << RCC_CFGR_PPRE2_SHIFT)));
setbits_le32(&STM32_RCC->cr, RCC_CR_PLLON);
while (!(readl(&STM32_RCC->cr) & RCC_CR_PLLRDY))
;
/* 5 wait states, Prefetch enabled, D-Cache enabled, I-Cache enabled */
writel(FLASH_ACR_WS(5) | FLASH_ACR_PRFTEN | FLASH_ACR_ICEN
| FLASH_ACR_DCEN, &STM32_FLASH->acr);
clrbits_le32(&STM32_RCC->cfgr, (RCC_CFGR_SW0 | RCC_CFGR_SW1));
setbits_le32(&STM32_RCC->cfgr, RCC_CFGR_SW_PLL);
while ((readl(&STM32_RCC->cfgr) & RCC_CFGR_SWS_MASK) !=
RCC_CFGR_SWS_PLL)
;
return 0;
}
unsigned long clock_get(enum clock clck)
{
u32 sysclk = 0;
u32 shift = 0;
/* PLL table lookups for clock computation */
u8 pll_mul_table[16] = {
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 16
};
/* Prescaler table lookups for clock computation */
u8 ahb_psc_table[16] = {
0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9
};
u8 apb_psc_table[8] = {
0, 0, 0, 0, 1, 2, 3, 4
};
if ((readl(&STM32_RCC->cfgr) & RCC_CFGR_SWS_MASK) ==
RCC_CFGR_SWS_PLL) {
u16 pll;
pll = ((readl(&STM32_RCC->cfgr) & RCC_CFGR_PLLMUL_MASK)
>> RCC_CFGR_PLLMUL_SHIFT);
sysclk = CONFIG_STM32_HSE_HZ * pll_mul_table[pll];
}
switch (clck) {
case CLOCK_CORE:
return sysclk;
break;
case CLOCK_AHB:
shift = ahb_psc_table[(
(readl(&STM32_RCC->cfgr) & RCC_CFGR_AHB_PSC_MASK)
>> RCC_CFGR_HPRE_SHIFT)];
return sysclk >>= shift;
break;
case CLOCK_APB1:
shift = apb_psc_table[(
(readl(&STM32_RCC->cfgr) & RCC_CFGR_APB1_PSC_MASK)
>> RCC_CFGR_PPRE1_SHIFT)];
return sysclk >>= shift;
break;
case CLOCK_APB2:
shift = apb_psc_table[(
(readl(&STM32_RCC->cfgr) & RCC_CFGR_APB2_PSC_MASK)
>> RCC_CFGR_PPRE2_SHIFT)];
return sysclk >>= shift;
break;
default:
return 0;
break;
}
}
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