diff options
Diffstat (limited to 'drivers/serial/8250.c')
| -rw-r--r-- | drivers/serial/8250.c | 76 |
1 files changed, 73 insertions, 3 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index f47d2c454e33..98820603e75f 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -40,6 +40,7 @@ #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/serial_8250.h> +#include <linux/nmi.h> #include <asm/io.h> #include <asm/irq.h> @@ -251,9 +252,53 @@ static const struct serial8250_config uart_config[] = { }, }; +#ifdef CONFIG_SERIAL_8250_AU1X00 + +/* Au1x00 UART hardware has a weird register layout */ +static const u8 au_io_in_map[] = { + [UART_RX] = 0, + [UART_IER] = 2, + [UART_IIR] = 3, + [UART_LCR] = 5, + [UART_MCR] = 6, + [UART_LSR] = 7, + [UART_MSR] = 8, +}; + +static const u8 au_io_out_map[] = { + [UART_TX] = 1, + [UART_IER] = 2, + [UART_FCR] = 4, + [UART_LCR] = 5, + [UART_MCR] = 6, +}; + +/* sane hardware needs no mapping */ +static inline int map_8250_in_reg(struct uart_8250_port *up, int offset) +{ + if (up->port.iotype != UPIO_AU) + return offset; + return au_io_in_map[offset]; +} + +static inline int map_8250_out_reg(struct uart_8250_port *up, int offset) +{ + if (up->port.iotype != UPIO_AU) + return offset; + return au_io_out_map[offset]; +} + +#else + +/* sane hardware needs no mapping */ +#define map_8250_in_reg(up, offset) (offset) +#define map_8250_out_reg(up, offset) (offset) + +#endif + static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset) { - offset <<= up->port.regshift; + offset = map_8250_in_reg(up, offset) << up->port.regshift; switch (up->port.iotype) { case UPIO_HUB6: @@ -266,6 +311,11 @@ static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset) case UPIO_MEM32: return readl(up->port.membase + offset); +#ifdef CONFIG_SERIAL_8250_AU1X00 + case UPIO_AU: + return __raw_readl(up->port.membase + offset); +#endif + default: return inb(up->port.iobase + offset); } @@ -274,7 +324,7 @@ static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset) static _INLINE_ void serial_out(struct uart_8250_port *up, int offset, int value) { - offset <<= up->port.regshift; + offset = map_8250_out_reg(up, offset) << up->port.regshift; switch (up->port.iotype) { case UPIO_HUB6: @@ -290,6 +340,12 @@ serial_out(struct uart_8250_port *up, int offset, int value) writel(value, up->port.membase + offset); break; +#ifdef CONFIG_SERIAL_8250_AU1X00 + case UPIO_AU: + __raw_writel(value, up->port.membase + offset); + break; +#endif + default: outb(value, up->port.iobase + offset); } @@ -910,6 +966,13 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) } } #endif + +#ifdef CONFIG_SERIAL_8250_AU1X00 + /* if access method is AU, it is a 16550 with a quirk */ + if (up->port.type == PORT_16550A && up->port.iotype == UPIO_AU) + up->bugs |= UART_BUG_NOMSR; +#endif + serial_outp(up, UART_LCR, save_lcr); if (up->capabilities != uart_config[up->port.type].flags) { @@ -1057,6 +1120,10 @@ static void serial8250_enable_ms(struct uart_port *port) { struct uart_8250_port *up = (struct uart_8250_port *)port; + /* no MSR capabilities */ + if (up->bugs & UART_BUG_NOMSR) + return; + up->ier |= UART_IER_MSI; serial_out(up, UART_IER, up->ier); } @@ -1774,7 +1841,8 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios, * CTS flow control flag and modem status interrupts */ up->ier &= ~UART_IER_MSI; - if (UART_ENABLE_MS(&up->port, termios->c_cflag)) + if (!(up->bugs & UART_BUG_NOMSR) && + UART_ENABLE_MS(&up->port, termios->c_cflag)) up->ier |= UART_IER_MSI; if (up->capabilities & UART_CAP_UUE) up->ier |= UART_IER_UUE | UART_IER_RTOIE; @@ -2141,6 +2209,8 @@ serial8250_console_write(struct console *co, const char *s, unsigned int count) unsigned int ier; int i; + touch_nmi_watchdog(); + /* * First save the UER then disable the interrupts */ |