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lib: utils: Fix shakti uart implementation

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Fix uart_putc implementation.
Due to a bug in the IP, this went unnoticed.
Use macros instead of magic numbers to make the code
more readable.

Signed-off-by: Vijai Kumar K <vijai@behindbytes.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Vijai Kumar K
2020-12-07 22:24:16 +05:30
committed by Anup Patel
parent 12394a269b
commit 0d49c3bc18
1 changed files with 6 additions and 2 deletions
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8
lib/utils/serial/shakti-uart.c
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@@ -18,18 +18,22 @@
#define REG_IQ_CYCLES 0x1C
#define REG_RX_THRES 0x20
#define UART_TX_FULL 0x2
#define UART_RX_FULL 0x8
static volatile void *uart_base;
void shakti_uart_putc(char ch)
{
while((readw(uart_base + REG_STATUS) & 0x2) == 0);
while((readw(uart_base + REG_STATUS) & UART_TX_FULL))
;
writeb(ch, uart_base + REG_TX);
}
int shakti_uart_getc(void)
{
u16 status = readw(uart_base + REG_STATUS);
if (status & 0x8)
if (status & UART_RX_FULL)
return readb(uart_base + REG_RX);
return -1;
}