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stm32:rcc: update _get_clock (uart/i2c) to handle all cases

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Adds handling for missing cases.  While i2c only has 3 cases, uarts have
all 4, so make sure they're handled properly.
Removes duplicated/redundant definitions.
Adds doxygen wrappers, even if only for internal use.

Fixes: e41ac6ea71 stm32: added peripheral clock get helpers for all stm32
Signed-of-by: Karl Palsson <karlp@tweak.au>
This commit is contained in:
Karl Palsson
2023-01-13 02:06:34 +00:00
parent df654d7f28
commit 88e91c9a7c
11 changed files with 175 additions and 168 deletions
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20
lib/stm32/f7/rcc.c
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@@ -485,18 +485,20 @@ void rcc_clock_setup_hsi(const struct rcc_clock_scale *clock)
}
static uint32_t rcc_usart_i2c_clksel_freq(uint32_t apb_clk, uint8_t shift) {
uint8_t clksel = (RCC_DCKCFGR2 >> shift) & RCC_DCKCFGR2_UART1SEL_MASK;
uint8_t clksel = (RCC_DCKCFGR2 >> shift) & RCC_DCKCFGR2_UARTxSEL_MASK;
uint8_t hpre = (RCC_CFGR >> RCC_CFGR_HPRE_SHIFT) & RCC_CFGR_HPRE_MASK;
switch (clksel) {
case RCC_DCKCFGR2_UARTxSEL_PCLK:
return apb_clk;
case RCC_DCKCFGR2_UARTxSEL_SYSCLK:
return rcc_ahb_frequency * rcc_get_div_from_hpre(hpre);
case RCC_DCKCFGR2_UARTxSEL_HSI:
return 16000000U;
default:
cm3_assert_not_reached();
case RCC_DCKCFGR2_UARTxSEL_PCLK:
return apb_clk;
case RCC_DCKCFGR2_UARTxSEL_SYSCLK:
return rcc_ahb_frequency * rcc_get_div_from_hpre(hpre);
/* This case is only valid for uarts, not for i2c! */
case RCC_DCKCFGR2_UARTxSEL_LSE:
return 32768;
case RCC_DCKCFGR2_UARTxSEL_HSI:
return 16000000U;
}
cm3_assert_not_reached();
}
/*---------------------------------------------------------------------------*/