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--- a/drivers/tty/serial/8250/Kconfig
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+++ b/drivers/tty/serial/8250/Kconfig
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@@ -249,6 +249,14 @@ config SERIAL_8250_ACORN
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system, say Y to this option. The driver can handle 1, 2, or 3 port
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cards. If unsure, say N.
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+config SERIAL_8250_RT288X
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+ bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support"
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+ depends on SERIAL_8250 != n && (SOC_RT288X || SOC_RT305X || SOC_RT3883)
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+ help
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+ If you have a Ralink RT288x/RT305x SoC based board and want to use the
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+ serial port, say Y to this option. The driver can handle up to 2 serial
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+ ports. If unsure, say N.
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+
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config SERIAL_8250_RM9K
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bool "Support for MIPS RM9xxx integrated serial port"
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depends on SERIAL_8250 != n && SERIAL_RM9000
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--- a/include/linux/serial_core.h
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+++ b/include/linux/serial_core.h
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@@ -132,7 +132,7 @@ struct uart_port {
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#define UPIO_HUB6 (1)
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#define UPIO_MEM (2)
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#define UPIO_MEM32 (3)
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-#define UPIO_AU (4) /* Au1x00 type IO */
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+#define UPIO_AU (4) /* Au1x00 and RT288x type IO */
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#define UPIO_TSI (5) /* Tsi108/109 type IO */
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#define UPIO_RM9000 (6) /* RM9000 type IO */
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--- a/drivers/tty/serial/8250/8250.c
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+++ b/drivers/tty/serial/8250/8250.c
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@@ -314,9 +314,9 @@ static void default_serial_dl_write(stru
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serial_out(up, UART_DLM, value >> 8 & 0xff);
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}
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-#ifdef CONFIG_MIPS_ALCHEMY
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+#if defined CONFIG_MIPS_ALCHEMY || defined (CONFIG_SERIAL_8250_RT288X)
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-/* Au1x00 UART hardware has a weird register layout */
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+/* Au1x00 and RT288x UART hardware has a weird register layout */
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static const u8 au_io_in_map[] = {
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[UART_RX] = 0,
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[UART_IER] = 2,
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@@ -495,7 +495,7 @@ static void set_io_from_upio(struct uart
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break;
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#endif
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-#ifdef CONFIG_MIPS_ALCHEMY
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+#if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X)
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case UPIO_AU:
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p->serial_in = au_serial_in;
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p->serial_out = au_serial_out;
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@@ -707,22 +707,19 @@ static int size_fifo(struct uart_8250_po
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*/
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static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
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{
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- unsigned char old_dll, old_dlm, old_lcr;
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+ unsigned char old_lcr;
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+ unsigned int old_dl;
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unsigned int id;
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old_lcr = serial_in(p, UART_LCR);
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serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A);
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- old_dll = serial_in(p, UART_DLL);
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- old_dlm = serial_in(p, UART_DLM);
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+ old_dl = serial_dl_read(p);
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- serial_out(p, UART_DLL, 0);
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- serial_out(p, UART_DLM, 0);
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+ serial_dl_write(p, 0);
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+ id = serial_dl_read(p);
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- id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8;
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-
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- serial_out(p, UART_DLL, old_dll);
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- serial_out(p, UART_DLM, old_dlm);
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+ serial_dl_write(p, old_dl);
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serial_out(p, UART_LCR, old_lcr);
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return id;
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@@ -848,7 +845,7 @@ static int broken_efr(struct uart_8250_p
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/*
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* Exar ST16C2550 "A2" devices incorrectly detect as
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* having an EFR, and report an ID of 0x0201. See
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- * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html
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+ * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html
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*/
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if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16)
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return 1;
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