diff options
Diffstat (limited to 'drivers/serial/serial_arc.c')
| -rw-r--r-- | drivers/serial/serial_arc.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/drivers/serial/serial_arc.c b/drivers/serial/serial_arc.c index e63d25d794..b21b12ba44 100644 --- a/drivers/serial/serial_arc.c +++ b/drivers/serial/serial_arc.c @@ -38,8 +38,24 @@ static void arc_serial_setbrg(void) gd->baudrate = CONFIG_BAUDRATE; arc_console_baud = gd->cpu_clk / (gd->baudrate * 4) - 1; - writel(arc_console_baud & 0xff, ®s->baudl); - writel((arc_console_baud & 0xff00) >> 8, ®s->baudh); + writeb(arc_console_baud & 0xff, ®s->baudl); + +#ifdef CONFIG_ARC + /* + * UART ISS(Instruction Set simulator) emulation has a subtle bug: + * A existing value of Baudh = 0 is used as a indication to startup + * it's internal state machine. + * Thus if baudh is set to 0, 2 times, it chokes. + * This happens with BAUD=115200 and the formaula above + * Until that is fixed, when running on ISS, we will set baudh to !0 + */ + if (gd->arch.running_on_hw) + writeb((arc_console_baud & 0xff00) >> 8, ®s->baudh); + else + writeb(1, ®s->baudh); +#else + writeb((arc_console_baud & 0xff00) >> 8, ®s->baudh); +#endif } static int arc_serial_init(void) @@ -54,15 +70,15 @@ static void arc_serial_putc(const char c) if (c == '\n') arc_serial_putc('\r'); - while (!(readl(®s->status) & UART_TXEMPTY)) + while (!(readb(®s->status) & UART_TXEMPTY)) ; - writel(c, ®s->data); + writeb(c, ®s->data); } static int arc_serial_tstc(void) { - return !(readl(®s->status) & UART_RXEMPTY); + return !(readb(®s->status) & UART_RXEMPTY); } static int arc_serial_getc(void) @@ -71,10 +87,10 @@ static int arc_serial_getc(void) ; /* Check for overflow errors */ - if (readl(®s->status) & UART_OVERFLOW_ERR) + if (readb(®s->status) & UART_OVERFLOW_ERR) return 0; - return readl(®s->data) & 0xFF; + return readb(®s->data) & 0xFF; } static void arc_serial_puts(const char *s) |