diff options
Diffstat (limited to 'hw/lpc-uart.c')
| -rw-r--r-- | hw/lpc-uart.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/hw/lpc-uart.c b/hw/lpc-uart.c index 9034fbd5..6e349ef9 100644 --- a/hw/lpc-uart.c +++ b/hw/lpc-uart.c @@ -548,6 +548,37 @@ static bool uart_init_hw(unsigned int speed, unsigned int clock) return false; } +/* + * early_uart_init() is similar to uart_init() in that it configures skiboot + * console log to output via a UART. The main differences are that the early + * version only works with MMIO UARTs and will not setup interrupts or locks. + */ +void early_uart_init(void) +{ + struct dt_node *uart_node; + u32 clk, baud; + + uart_node = dt_find_compatible_node(dt_root, NULL, "ns16550"); + if (!uart_node) + return; + + /* Try translate the address, if this fails then it's not a MMIO UART */ + mmio_uart_base = (void *) dt_translate_address(uart_node, 0, NULL); + if (!mmio_uart_base) + return; + + clk = dt_prop_get_u32(uart_node, "clock-frequency"); + baud = dt_prop_get_u32(uart_node, "current-speed"); + + if (uart_init_hw(baud, clk)) { + set_console(&uart_con_driver); + prlog(PR_NOTICE, "UART: Using UART at %p\n", mmio_uart_base); + } else { + prerror("UART: Early init failed!"); + mmio_uart_base = NULL; + } +} + void uart_init(void) { const struct dt_property *prop; @@ -555,6 +586,9 @@ void uart_init(void) char *path __unused; const uint32_t *irqp; + /* Clean up after early_uart_init() */ + mmio_uart_base = NULL; + /* UART lock is in the console path and thus must block * printf re-entrancy */ |
