diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_port.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 38 |
1 files changed, 20 insertions, 18 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 3a8747ec672b..1311b00f8194 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -336,27 +336,29 @@ static void default_serial_dl_write(struct uart_8250_port *up, int value) #ifdef CONFIG_SERIAL_8250_RT288X +#define UART_REG_UNMAPPED -1 + /* Au1x00/RT288x UART hardware has a weird register layout */ static const s8 au_io_in_map[8] = { - 0, /* UART_RX */ - 2, /* UART_IER */ - 3, /* UART_IIR */ - 5, /* UART_LCR */ - 6, /* UART_MCR */ - 7, /* UART_LSR */ - 8, /* UART_MSR */ - -1, /* UART_SCR (unmapped) */ + [UART_RX] = 0, + [UART_IER] = 2, + [UART_IIR] = 3, + [UART_LCR] = 5, + [UART_MCR] = 6, + [UART_LSR] = 7, + [UART_MSR] = 8, + [UART_SCR] = UART_REG_UNMAPPED, }; static const s8 au_io_out_map[8] = { - 1, /* UART_TX */ - 2, /* UART_IER */ - 4, /* UART_FCR */ - 5, /* UART_LCR */ - 6, /* UART_MCR */ - -1, /* UART_LSR (unmapped) */ - -1, /* UART_MSR (unmapped) */ - -1, /* UART_SCR (unmapped) */ + [UART_TX] = 1, + [UART_IER] = 2, + [UART_FCR] = 4, + [UART_LCR] = 5, + [UART_MCR] = 6, + [UART_LSR] = UART_REG_UNMAPPED, + [UART_MSR] = UART_REG_UNMAPPED, + [UART_SCR] = UART_REG_UNMAPPED, }; unsigned int au_serial_in(struct uart_port *p, int offset) @@ -364,7 +366,7 @@ unsigned int au_serial_in(struct uart_port *p, int offset) if (offset >= ARRAY_SIZE(au_io_in_map)) return UINT_MAX; offset = au_io_in_map[offset]; - if (offset < 0) + if (offset == UART_REG_UNMAPPED) return UINT_MAX; return __raw_readl(p->membase + (offset << p->regshift)); } @@ -374,7 +376,7 @@ void au_serial_out(struct uart_port *p, int offset, int value) if (offset >= ARRAY_SIZE(au_io_out_map)) return; offset = au_io_out_map[offset]; - if (offset < 0) + if (offset == UART_REG_UNMAPPED) return; __raw_writel(value, p->membase + (offset << p->regshift)); } |