The patch titled
RM9000 serial driver
has been added to the -mm tree. Its filename is
rm9000-serial-driver.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: RM9000 serial driver
From: Thomas Koeller <[EMAIL PROTECTED]>
Add support for the integrated serial ports of the MIPS RM9122 processor
and its relatives. There has been some discussion about this patch. The
interesting part starts here:
http://marc.theaimsgroup.com/?l=linux-mips&m=115620115100412&w=2
Signed-off-by: Thomas Koeller <[EMAIL PROTECTED]>
Cc: Sergei Shtylyov <[EMAIL PROTECTED]>
Cc: Ralf Baechle <[EMAIL PROTECTED]>
Cc: Russell King <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
arch/mips/Kconfig | 3 +
drivers/serial/8250.c | 102 +++++++++++++++++++++++++---------
drivers/serial/Kconfig | 9 +++
include/linux/serial_core.h | 3 -
4 files changed, 89 insertions(+), 28 deletions(-)
diff -puN arch/mips/Kconfig~rm9000-serial-driver arch/mips/Kconfig
--- a/arch/mips/Kconfig~rm9000-serial-driver
+++ a/arch/mips/Kconfig
@@ -1012,6 +1012,9 @@ config SOC_AU1X00
select SYS_SUPPORTS_32BIT_KERNEL
select SYS_SUPPORTS_APM_EMULATION
+config SERIAL_RM9000
+ bool
+
config PNX8550
bool
select SOC_PNX8550
diff -puN drivers/serial/8250.c~rm9000-serial-driver drivers/serial/8250.c
--- a/drivers/serial/8250.c~rm9000-serial-driver
+++ a/drivers/serial/8250.c
@@ -251,9 +251,16 @@ static const struct serial8250_config ua
.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 +296,36 @@ static inline int map_8250_out_reg(struc
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
+ };
+
+#define map_8250_in_reg(up, offset) \
+ (((up)->port.type == PORT_RM9000) ? regmap_in[offset] : (offset))
+#define map_8250_out_reg(up, offset) \
+ (((up)->port.type == PORT_RM9000) ? regmap_out[offset] : (offset))
+
+
#else
/* sane hardware needs no mapping */
@@ -391,21 +428,21 @@ serial_out_sync(struct uart_8250_port *u
#define serial_outp(up, offset, value) serial_out(up, offset, value)
/* Uart divisor latch read */
-static inline int _serial_dl_read(struct uart_8250_port *up)
+static inline unsigned int _serial_dl_read(struct uart_8250_port *up)
{
return serial_inp(up, UART_DLL) | serial_inp(up, UART_DLM) << 8;
}
/* Uart divisor latch write */
-static inline void _serial_dl_write(struct uart_8250_port *up, int value)
+static inline void _serial_dl_write(struct uart_8250_port *up, unsigned int
value)
{
serial_outp(up, UART_DLL, value & 0xff);
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)
+static unsigned int serial_dl_read(struct uart_8250_port *up)
{
if (up->port.iotype == UPIO_AU)
return __raw_readl(up->port.membase + 0x28);
@@ -413,13 +450,26 @@ static int serial_dl_read(struct uart_82
return _serial_dl_read(up);
}
-static void serial_dl_write(struct uart_8250_port *up, int value)
+static void serial_dl_write(struct uart_8250_port *up, unsigned int value)
{
if (up->port.iotype == UPIO_AU)
__raw_writel(value, up->port.membase + 0x28);
else
_serial_dl_write(up, value);
}
+#elif defined (CONFIG_SERIAL_8250_RM9K)
+static inline unsigned int serial_dl_read(struct uart_8250_port *up)
+{
+ return
+ ((readl(up->port.membase + 0x10) << 8) |
+ (readl(up->port.membase + 0x08) & 0xff)) & 0xffff;
+}
+
+static inline void serial_dl_write(struct uart_8250_port *up, unsigned int
value)
+{
+ writel(value, up->port.membase + 0x08);
+ writel(value >> 8, up->port.membase + 0x10);
+}
#else
#define serial_dl_read(up) _serial_dl_read(up)
#define serial_dl_write(up, value) _serial_dl_write(up, value)
@@ -593,22 +643,17 @@ 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 int id;
+ unsigned char old_lcr;
+ unsigned int id, old_dl;
old_lcr = serial_inp(p, UART_LCR);
serial_outp(p, UART_LCR, UART_LCR_DLAB);
+ old_dl = _serial_dl_read(p);
- old_dll = serial_inp(p, UART_DLL);
- old_dlm = serial_inp(p, UART_DLM);
-
- 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;
@@ -621,7 +666,7 @@ static unsigned int autoconfig_read_divi
* 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)
@@ -674,7 +719,7 @@ static void autoconfig_has_efr(struct ua
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
@@ -817,7 +862,7 @@ static void autoconfig_16550a(struct uar
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);
@@ -922,7 +967,7 @@ static void autoconfig(struct uart_8250_
/*
* 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;
@@ -961,7 +1006,7 @@ static void autoconfig(struct uart_8250_
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
@@ -1068,7 +1113,7 @@ static void autoconfig(struct uart_8250_
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);
@@ -1094,7 +1139,7 @@ static void autoconfig_irq(struct uart_8
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);
@@ -1159,8 +1204,11 @@ static void serial8250_start_tx(struct u
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);
}
}
@@ -1930,7 +1978,7 @@ serial8250_set_termios(struct uart_port
/*
* 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);
/*
diff -puN drivers/serial/Kconfig~rm9000-serial-driver drivers/serial/Kconfig
--- a/drivers/serial/Kconfig~rm9000-serial-driver
+++ a/drivers/serial/Kconfig
@@ -264,6 +264,15 @@ 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
diff -puN include/linux/serial_core.h~rm9000-serial-driver
include/linux/serial_core.h
--- a/include/linux/serial_core.h~rm9000-serial-driver
+++ a/include/linux/serial_core.h
@@ -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
_
Patches currently in -mm which might be from [EMAIL PROTECTED] are
git-mtd.patch
rm9000-serial-driver.patch
-
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