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path: root/drivers/serial/8250.c
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Diffstat (limited to 'drivers/serial/8250.c')
-rw-r--r--drivers/serial/8250.c73
1 files changed, 70 insertions, 3 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index f47d2c454e3..186e96c47b3 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -251,9 +251,53 @@ 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 +310,11 @@ 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 +323,7 @@ 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 +339,12 @@ 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 +965,13 @@ 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 +1119,10 @@ 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 +1840,8 @@ 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;