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| author | Antonio Borneo <borneo.antonio@gmail.com> | 2015-07-19 22:19:47 +0800 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2015-07-27 15:02:14 -0400 |
| commit | fffde77e130897124e76108cdcb0ff9246a90a78 (patch) | |
| tree | dab8d5bbc1e78399b3ecd7e06622cfb7d9af9df4 /arch/arm/cpu | |
| parent | 089fddfde2cb360ac2d040166301d5ce7af8314e (diff) | |
| download | u-boot-imx-fffde77e130897124e76108cdcb0ff9246a90a78.zip u-boot-imx-fffde77e130897124e76108cdcb0ff9246a90a78.tar.gz u-boot-imx-fffde77e130897124e76108cdcb0ff9246a90a78.tar.bz2 | |
stm32f4: add cpu clock option for 180 MHz
While most stm32f4 run at 168 MHz, stm32f429 can work till 180 MHz.
Add option to select 180 MHz through macro CONFIG_SYS_CLK_FREQ.
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
To: Albert Aribaud <albert.u.boot@aribaud.net>
To: Tom Rini <trini@konsulko.com>
To: Kamil Lulko <rev13@wp.pl>
Cc: u-boot@lists.denx.de
Diffstat (limited to 'arch/arm/cpu')
| -rw-r--r-- | arch/arm/cpu/armv7m/stm32f4/clock.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/arch/arm/cpu/armv7m/stm32f4/clock.c b/arch/arm/cpu/armv7m/stm32f4/clock.c index 2eded1f..d520a13 100644 --- a/arch/arm/cpu/armv7m/stm32f4/clock.c +++ b/arch/arm/cpu/armv7m/stm32f4/clock.c @@ -92,7 +92,20 @@ struct pll_psc { #error "CONFIG_STM32_HSE_HZ not defined!" #else #if (CONFIG_STM32_HSE_HZ == 8000000) -struct pll_psc pll_psc_168 = { +#if (CONFIG_SYS_CLK_FREQ == 180000000) +/* 180 MHz */ +struct pll_psc sys_pll_psc = { + .pll_m = 8, + .pll_n = 360, + .pll_p = 2, + .pll_q = 8, + .ahb_psc = AHB_PSC_1, + .apb1_psc = APB_PSC_4, + .apb2_psc = APB_PSC_2 +}; +#else +/* default 168 MHz */ +struct pll_psc sys_pll_psc = { .pll_m = 8, .pll_n = 336, .pll_p = 2, @@ -101,6 +114,7 @@ struct pll_psc pll_psc_168 = { .apb1_psc = APB_PSC_4, .apb2_psc = APB_PSC_2 }; +#endif #else #error "No PLL/Prescaler configuration for given CONFIG_STM32_HSE_HZ exists" #endif @@ -122,19 +136,19 @@ int configure_clocks(void) while (!(readl(&STM32_RCC->cr) & RCC_CR_HSERDY)) ; - /* Enable high performance mode, System frequency up to 168 MHz */ + /* Enable high performance mode, System frequency up to 180 MHz */ setbits_le32(&STM32_RCC->apb1enr, RCC_APB1ENR_PWREN); writel(PWR_CR_VOS_SCALE_MODE_1, &STM32_PWR->cr); setbits_le32(&STM32_RCC->cfgr, (( - pll_psc_168.ahb_psc << RCC_CFGR_HPRE_SHIFT) - | (pll_psc_168.apb1_psc << RCC_CFGR_PPRE1_SHIFT) - | (pll_psc_168.apb2_psc << RCC_CFGR_PPRE2_SHIFT))); - - writel(pll_psc_168.pll_m - | (pll_psc_168.pll_n << RCC_PLLCFGR_PLLN_SHIFT) - | (((pll_psc_168.pll_p >> 1) - 1) << RCC_PLLCFGR_PLLP_SHIFT) - | (pll_psc_168.pll_q << RCC_PLLCFGR_PLLQ_SHIFT), + sys_pll_psc.ahb_psc << RCC_CFGR_HPRE_SHIFT) + | (sys_pll_psc.apb1_psc << RCC_CFGR_PPRE1_SHIFT) + | (sys_pll_psc.apb2_psc << RCC_CFGR_PPRE2_SHIFT))); + + writel(sys_pll_psc.pll_m + | (sys_pll_psc.pll_n << RCC_PLLCFGR_PLLN_SHIFT) + | (((sys_pll_psc.pll_p >> 1) - 1) << RCC_PLLCFGR_PLLP_SHIFT) + | (sys_pll_psc.pll_q << RCC_PLLCFGR_PLLQ_SHIFT), &STM32_RCC->pllcfgr); setbits_le32(&STM32_RCC->pllcfgr, RCC_PLLCFGR_PLLSRC); |