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RM9000 serial driver 

Add support for the integrated serial ports of the MIPS RM9122 processor
and its relatives.

The patch also does some whitespace cleanup.

[akpm@linux-foundation.org: cleanups]
Signed-off-by: Thomas Koeller <thomas.koeller@baslerweb.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Koeller 2007-05-06 14:48:47 -07:00 committed by Linus Torvalds
parent beab697ab4
commit bd71c182d5
4 changed files with 95 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/mips/Kconfig
View File

@ -1042,6 +1042,9 @@ config SOC_AU1X00
select SYS_SUPPORTS_APM_EMULATION
select SYS_SUPPORTS_KGDB
config SERIAL_RM9000
bool
config PNX8550
bool
select SOC_PNX8550

76
drivers/serial/8250.c
View File

@ -251,9 +251,16 @@ static const struct serial8250_config uart_config[] = {
.fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
.flags = UART_CAP_FIFO | UART_CAP_UUE,
},
[PORT_RM9000] = {
.name = "RM9000",
.fifo_size = 16,
.tx_loadsz = 16,
.fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
.flags = UART_CAP_FIFO,
},
};
#ifdef CONFIG_SERIAL_8250_AU1X00
#if defined (CONFIG_SERIAL_8250_AU1X00)
/* Au1x00 UART hardware has a weird register layout */
static const u8 au_io_in_map[] = {
@ -289,6 +296,44 @@ static inline int map_8250_out_reg(struct uart_8250_port *up, int offset)
return au_io_out_map[offset];
}
#elif defined (CONFIG_SERIAL_8250_RM9K)
static const u8
regmap_in[8] = {
[UART_RX] = 0x00,
[UART_IER] = 0x0c,
[UART_IIR] = 0x14,
[UART_LCR] = 0x1c,
[UART_MCR] = 0x20,
[UART_LSR] = 0x24,
[UART_MSR] = 0x28,
[UART_SCR] = 0x2c
},
regmap_out[8] = {
[UART_TX] = 0x04,
[UART_IER] = 0x0c,
[UART_FCR] = 0x18,
[UART_LCR] = 0x1c,
[UART_MCR] = 0x20,
[UART_LSR] = 0x24,
[UART_MSR] = 0x28,
[UART_SCR] = 0x2c
};
static inline int map_8250_in_reg(struct uart_8250_port *up, int offset)
{
if (up->port.iotype != UPIO_RM9000)
return offset;
return regmap_in[offset];
}
static inline int map_8250_out_reg(struct uart_8250_port *up, int offset)
{
if (up->port.iotype != UPIO_RM9000)
return offset;
return regmap_out[offset];
}
#else
/* sane hardware needs no mapping */
@ -311,6 +356,7 @@ static unsigned int serial_in(struct uart_8250_port *up, int offset)
case UPIO_DWAPB:
return readb(up->port.membase + offset);
case UPIO_RM9000:
case UPIO_MEM32:
return readl(up->port.membase + offset);
@ -348,6 +394,7 @@ serial_out(struct uart_8250_port *up, int offset, int value)
writeb(value, up->port.membase + offset);
break;
case UPIO_RM9000:
case UPIO_MEM32:
writel(value, up->port.membase + offset);
break;
@ -419,7 +466,7 @@ static inline void _serial_dl_write(struct uart_8250_port *up, int value)
serial_outp(up, UART_DLM, value >> 8 & 0xff);
}
#ifdef CONFIG_SERIAL_8250_AU1X00
#if defined (CONFIG_SERIAL_8250_AU1X00)
/* Au1x00 haven't got a standard divisor latch */
static int serial_dl_read(struct uart_8250_port *up)
{
@ -436,6 +483,24 @@ static void serial_dl_write(struct uart_8250_port *up, int value)
else
_serial_dl_write(up, value);
}
#elif defined (CONFIG_SERIAL_8250_RM9K)
static int serial_dl_read(struct uart_8250_port *up)
{
return (up->port.iotype == UPIO_RM9000) ?
(((__raw_readl(up->port.membase + 0x10) << 8) |
(__raw_readl(up->port.membase + 0x08) & 0xff)) & 0xffff) :
_serial_dl_read(up);
}
static void serial_dl_write(struct uart_8250_port *up, int value)
{
if (up->port.iotype == UPIO_RM9000) {
__raw_writel(value, up->port.membase + 0x08);
__raw_writel(value >> 8, up->port.membase + 0x10);
} else {
_serial_dl_write(up, value);
}
}
#else
#define serial_dl_read(up) _serial_dl_read(up)
#define serial_dl_write(up, value) _serial_dl_write(up, value)
@ -1175,8 +1240,11 @@ static void serial8250_start_tx(struct uart_port *port)
if (up->bugs & UART_BUG_TXEN) {
unsigned char lsr, iir;
lsr = serial_in(up, UART_LSR);
iir = serial_in(up, UART_IIR);
if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT)
iir = serial_in(up, UART_IIR) & 0x0f;
if ((up->port.type == PORT_RM9000) ?
(lsr & UART_LSR_THRE &&
(iir == UART_IIR_NO_INT || iir == UART_IIR_THRI)) :
(lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT))
transmit_chars(up);
}
}

9
drivers/serial/Kconfig
View File

@ -254,6 +254,15 @@ config SERIAL_8250_AU1X00
to this option. The driver can handle 1 or 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
select SERIAL_8250_SHARE_IRQ
help
Selecting this option will add support for the integrated serial
port hardware found on MIPS RM9122 and similar processors.
If unsure, say N.
comment "Non-8250 serial port support"
config SERIAL_AMBA_PL010

4
include/linux/serial_core.h
View File

@ -39,7 +39,8 @@
#define PORT_RSA 13
#define PORT_NS16550A 14
#define PORT_XSCALE 15
#define PORT_MAX_8250 15 /* max port ID */
#define PORT_RM9000 16 /* PMC-Sierra RM9xxx internal UART */
#define PORT_MAX_8250 16 /* max port ID */
/*
* ARM specific type numbers. These are not currently guaranteed
@ -231,6 +232,7 @@ struct uart_port {
#define UPIO_AU (4) /* Au1x00 type IO */
#define UPIO_TSI (5) /* Tsi108/109 type IO */
#define UPIO_DWAPB (6) /* DesignWare APB UART */
#define UPIO_RM9000 (7) /* RM9000 type IO */
unsigned int read_status_mask; /* driver specific */
unsigned int ignore_status_mask; /* driver specific */