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--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -318,9 +318,9 @@ static const struct serial8250_config ua
},
};
-#if defined(CONFIG_MIPS_ALCHEMY)
+#if defined(CONFIG_MIPS_ALCHEMY) || defined (CONFIG_SERIAL_8250_RT288X)
-/* Au1x00 UART hardware has a weird register layout */
+/* Au1x00 and RT288x UART hardware has a weird register layout */
static const u8 au_io_in_map[] = {
[UART_RX] = 0,
[UART_IER] = 2,
@@ -542,8 +542,8 @@ static inline void _serial_dl_write(stru
serial_outp(up, UART_DLM, value >> 8 & 0xff);
}
-#if defined(CONFIG_MIPS_ALCHEMY)
-/* Au1x00 haven't got a standard divisor latch */
+#if defined(CONFIG_MIPS_ALCHEMY) || defined (CONFIG_SERIAL_8250_RT288X)
+/* Au1x00 and RT288x haven't got a standard divisor latch */
static int serial_dl_read(struct uart_8250_port *up)
{
if (up->port.iotype == UPIO_AU)
@@ -750,22 +750,19 @@ static int size_fifo(struct uart_8250_po
*/
static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
{
- unsigned char old_dll, old_dlm, old_lcr;
+ unsigned char old_lcr;
+ unsigned int old_dl;
unsigned int id;
old_lcr = serial_inp(p, UART_LCR);
serial_outp(p, UART_LCR, UART_LCR_CONF_MODE_A);
- old_dll = serial_inp(p, UART_DLL);
- old_dlm = serial_inp(p, UART_DLM);
+ old_dl = serial_dl_read(p);
- serial_outp(p, UART_DLL, 0);
- serial_outp(p, UART_DLM, 0);
+ serial_dl_write(p, 0);
+ id = serial_dl_read(p);
- id = serial_inp(p, UART_DLL) | serial_inp(p, UART_DLM) << 8;
-
- serial_outp(p, UART_DLL, old_dll);
- serial_outp(p, UART_DLM, old_dlm);
+ serial_dl_write(p, old_dl);
serial_outp(p, UART_LCR, old_lcr);
return id;
@@ -891,7 +888,7 @@ static int broken_efr(struct uart_8250_p
/*
* Exar ST16C2550 "A2" devices incorrectly detect as
* having an EFR, and report an ID of 0x0201. See
- * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html
+ * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html
*/
if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16)
return 1;
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -258,6 +258,14 @@ config SERIAL_8250_ACORN
system, say Y to this option. The driver can handle 1, 2, or 3 port
cards. If unsure, say N.
+config SERIAL_8250_RT288X
+ bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
+ depends on SERIAL_8250 != n && (SOC_RT288X || SOC_RT305X || SOC_RT3883)
+ help
+ If you have a Ralink RT288x/RT305x SoC based board and want to use the
+ serial port, say Y to this option. The driver can handle up to 2 serial
+ ports. If unsure, say N.
+
config SERIAL_8250_RM9K
bool "Support for MIPS RM9xxx integrated serial port"
depends on SERIAL_8250 != n && SERIAL_RM9000
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -317,7 +317,7 @@ struct uart_port {
#define UPIO_HUB6 (1)
#define UPIO_MEM (2)
#define UPIO_MEM32 (3)
-#define UPIO_AU (4) /* Au1x00 type IO */
+#define UPIO_AU (4) /* Au1x00 and RT288x type IO */
#define UPIO_TSI (5) /* Tsi108/109 type IO */
#define UPIO_RM9000 (6) /* RM9000 type IO */
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