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lib: serial: Clean up coding style in sifive-uart.c

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Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Andrew Jones
2022-07-18 19:20:27 +02:00
committed by Anup Patel
parent 7d28d3be50
commit 7198e1d06f
1 changed files with 8 additions and 3 deletions
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11
lib/utils/serial/sifive-uart.c
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@@ -48,12 +48,12 @@ static inline unsigned int uart_min_clk_divisor(uint64_t in_freq,
uint64_t max_target_hz) uint64_t max_target_hz)
{ {
uint64_t quotient = (in_freq + max_target_hz - 1) / (max_target_hz); uint64_t quotient = (in_freq + max_target_hz - 1) / (max_target_hz);
/* Avoid underflow */ /* Avoid underflow */
if (quotient == 0) { if (quotient == 0)
return 0; return 0;
} else { else
return quotient - 1; return quotient - 1;
}
} }
static u32 get_reg(u32 num) static u32 get_reg(u32 num)
@@ -77,8 +77,10 @@ static void sifive_uart_putc(char ch)
static int sifive_uart_getc(void) static int sifive_uart_getc(void)
{ {
u32 ret = get_reg(UART_REG_RXFIFO); u32 ret = get_reg(UART_REG_RXFIFO);
if (!(ret & UART_RXFIFO_EMPTY)) if (!(ret & UART_RXFIFO_EMPTY))
return ret & UART_RXFIFO_DATA; return ret & UART_RXFIFO_DATA;
return -1; return -1;
} }
@@ -97,10 +99,13 @@ int sifive_uart_init(unsigned long base, u32 in_freq, u32 baudrate)
/* Configure baudrate */ /* Configure baudrate */
if (in_freq) if (in_freq)
set_reg(UART_REG_DIV, uart_min_clk_divisor(in_freq, baudrate)); set_reg(UART_REG_DIV, uart_min_clk_divisor(in_freq, baudrate));
/* Disable interrupts */ /* Disable interrupts */
set_reg(UART_REG_IE, 0); set_reg(UART_REG_IE, 0);
/* Enable TX */ /* Enable TX */
set_reg(UART_REG_TXCTRL, UART_TXCTRL_TXEN); set_reg(UART_REG_TXCTRL, UART_TXCTRL_TXEN);
/* Enable Rx */ /* Enable Rx */
set_reg(UART_REG_RXCTRL, UART_RXCTRL_RXEN); set_reg(UART_REG_RXCTRL, UART_RXCTRL_RXEN);