ARMv7M: add STM32F1 support
Add ARMv7M STM32F1 support including clocks, timer, gpio, and flash.
Signed-off-by: Matt Porter <mporter@konsulko.com>
diff --git a/arch/arm/cpu/armv7m/stm32f1/clock.c b/arch/arm/cpu/armv7m/stm32f1/clock.c
new file mode 100644
index 0000000..acad116
--- /dev/null
+++ b/arch/arm/cpu/armv7m/stm32f1/clock.c
@@ -0,0 +1,196 @@
+/*
+ * (C) Copyright 2015
+ * Kamil Lulko, <rev13@wp.pl>
+ *
+ * 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;
+ }
+}