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RM9000 serial driver
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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>
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Thomas Koeller authored and Linus Torvalds committed May 7, 2007
1 parent beab697 commit bd71c18
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Showing 4 changed files with 95 additions and 13 deletions.
3 changes: 3 additions & 0 deletions arch/mips/Kconfig
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand Down
92 changes: 80 additions & 12 deletions drivers/serial/8250.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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[] = {
Expand Down Expand Up @@ -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 */
Expand All @@ -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);

Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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)
{
Expand All @@ -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)
Expand Down Expand Up @@ -637,7 +702,7 @@ static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
* its clones. (We treat the broken original StarTech 16650 V1 as a
* 16550, and why not? Startech doesn't seem to even acknowledge its
* existence.)
*
*
* What evil have men's minds wrought...
*/
static void autoconfig_has_efr(struct uart_8250_port *up)
Expand Down Expand Up @@ -690,7 +755,7 @@ static void autoconfig_has_efr(struct uart_8250_port *up)
up->bugs |= UART_BUG_QUOT;
return;
}

/*
* We check for a XR16C850 by setting DLL and DLM to 0, and then
* reading back DLL and DLM. The chip type depends on the DLM
Expand Down Expand Up @@ -833,7 +898,7 @@ static void autoconfig_16550a(struct uart_8250_port *up)
status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
status1 |= 0x10; /* 1.625 divisor for baud_base --> 921600 */
serial_outp(up, 0x04, status1);

serial_dl_write(up, quot);

serial_outp(up, UART_LCR, 0);
Expand Down Expand Up @@ -938,7 +1003,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
/*
* Do a simple existence test first; if we fail this,
* there's no point trying anything else.
*
*
* 0x80 is used as a nonsense port to prevent against
* false positives due to ISA bus float. The
* assumption is that 0x80 is a non-existent port;
Expand Down Expand Up @@ -977,7 +1042,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
save_mcr = serial_in(up, UART_MCR);
save_lcr = serial_in(up, UART_LCR);

/*
/*
* Check to see if a UART is really there. Certain broken
* internal modems based on the Rockwell chipset fail this
* test, because they apparently don't implement the loopback
Expand Down Expand Up @@ -1084,7 +1149,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
else
serial_outp(up, UART_IER, 0);

out:
out:
spin_unlock_irqrestore(&up->port.lock, flags);
// restore_flags(flags);
DEBUG_AUTOCONF("type=%s\n", uart_config[up->port.type].name);
Expand All @@ -1110,7 +1175,7 @@ static void autoconfig_irq(struct uart_8250_port *up)
save_mcr = serial_inp(up, UART_MCR);
save_ier = serial_inp(up, UART_IER);
serial_outp(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2);

irqs = probe_irq_on();
serial_outp(up, UART_MCR, 0);
udelay (10);
Expand Down Expand Up @@ -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);
}
}
Expand Down Expand Up @@ -1957,7 +2025,7 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
/*
* Ask the core to calculate the divisor for us.
*/
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
quot = serial8250_get_divisor(port, baud);

/*
Expand Down
9 changes: 9 additions & 0 deletions drivers/serial/Kconfig
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand Down
4 changes: 3 additions & 1 deletion include/linux/serial_core.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand Down Expand Up @@ -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 */
Expand Down

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