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uart: Add rounded clocking for 1 mbaud

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CTCaer
2020-04-30 03:34:05 +03:00
parent a00f25d2f9
commit 63768ccc99
5 changed files with 62 additions and 6 deletions
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10
bootloader/soc/uart.c
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@@ -15,6 +15,7 @@
*/
#include "../soc/uart.h"
#include "../soc/clock.h"
#include "../soc/t210.h"
#include "../utils/util.h"
@@ -28,12 +29,15 @@ void uart_init(u32 idx, u32 baud)
// Make sure no data is being sent.
uart_wait_idle(idx, UART_TX_IDLE);
// Set clock.
bool clk_type = clock_uart_use_src_div(idx, baud);
// Misc settings.
u32 rate = (8 * baud + 408000000) / (16 * baud);
u32 div = clk_type ? ((8 * baud + 408000000) / (16 * baud)) : 1; // DIV_ROUND_CLOSEST.
uart->UART_IER_DLAB = 0; // Disable interrupts.
uart->UART_LCR = UART_LCR_DLAB | UART_LCR_WORD_LENGTH_8; // Enable DLAB & set 8n1 mode.
uart->UART_THR_DLAB = (u8)rate; // Divisor latch LSB.
uart->UART_IER_DLAB = (u8)(rate >> 8); // Divisor latch MSB.
uart->UART_THR_DLAB = (u8)div; // Divisor latch LSB.
uart->UART_IER_DLAB = (u8)(div >> 8); // Divisor latch MSB.
uart->UART_LCR = UART_LCR_WORD_LENGTH_8; // Disable DLAB.
(void)uart->UART_SPR;