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Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty into for-next 

Conflicts:
	arch/arm64/kernel/early_printk.c
This commit is contained in:
Rob Herring 2014-05-20 14:22:54 -05:00
parent eafd370dfe e26f1db9b8
commit 6e87b7030e
31 changed files with 3191 additions and 991 deletions
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33
Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt Normal file
View File

@ -0,0 +1,33 @@
* NXP SC16IS7xx advanced Universal Asynchronous Receiver-Transmitter (UART)
Required properties:
- compatible: Should be one of the following:
- "nxp,sc16is740" for NXP SC16IS740,
- "nxp,sc16is741" for NXP SC16IS741,
- "nxp,sc16is750" for NXP SC16IS750,
- "nxp,sc16is752" for NXP SC16IS752,
- "nxp,sc16is760" for NXP SC16IS760,
- "nxp,sc16is762" for NXP SC16IS762.
- reg: I2C address of the SC16IS7xx device.
- interrupt-parent: The phandle for the interrupt controller that
services interrupts for this IC.
- interrupts: Should contain the UART interrupt
- clocks: Reference to the IC source clock.
Optional properties:
- gpio-controller: Marks the device node as a GPIO controller.
- #gpio-cells: Should be two. The first cell is the GPIO number and
the second cell is used to specify the GPIO polarity:
0 = active high,
1 = active low.
Example:
sc16is750: sc16is750@51 {
compatible = "nxp,sc16is750";
reg = <0x51>;
clocks = <&clk20m>;
interrupt-parent = <&gpio3>;
interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
gpio-controller;
#gpio-cells = <2>;
};

9
Documentation/kernel-parameters.txt
View File

@ -883,6 +883,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
which are not unmapped.
earlycon= [KNL] Output early console device and options.
uart[8250],io,<addr>[,options]
uart[8250],mmio,<addr>[,options]
uart[8250],mmio32,<addr>[,options]
@ -892,6 +893,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
(mmio) or 32-bit (mmio32).
The options are the same as for ttyS, above.
pl011,<addr>
Start an early, polled-mode console on a pl011 serial
port at the specified address. The pl011 serial port
must already be setup and configured. Options are not
yet supported.
smh Use ARM semihosting calls for early console.
earlyprintk= [X86,SH,BLACKFIN,ARM]
earlyprintk=vga
earlyprintk=efi

3
arch/arm64/Kconfig
View File

@ -112,6 +112,9 @@ config IOMMU_HELPER
config KERNEL_MODE_NEON
def_bool y
config FIX_EARLYCON_MEM
def_bool y
source "init/Kconfig"
source "kernel/Kconfig.freezer"

9
arch/arm64/Kconfig.debug
View File

@ -20,15 +20,6 @@ config STRICT_DEVMEM
If in doubt, say Y.
config EARLY_PRINTK
bool "Early printk support"
default y
help
Say Y here if you want to have an early console using the
earlyprintk=<name>[,<addr>][,<options>] kernel parameter. It
is assumed that the early console device has been initialised
by the boot loader prior to starting the Linux kernel.
config PID_IN_CONTEXTIDR
bool "Write the current PID to the CONTEXTIDR register"
help

1
arch/arm64/kernel/Makefile
View File

@ -18,7 +18,6 @@ arm64-obj-$(CONFIG_SMP) += smp.o smp_spin_table.o topology.o
arm64-obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
arm64-obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o
arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
arm64-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o
arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
arm64-obj-$(CONFIG_KGDB) += kgdb.o

156
arch/arm64/kernel/early_printk.c
View File

@ -1,156 +0,0 @@
/*
* Earlyprintk support.
*
* Copyright (C) 2012 ARM Ltd.
* Author: Catalin Marinas <catalin.marinas@arm.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <linux/amba/serial.h>
#include <linux/serial_reg.h>
#include <asm/fixmap.h>
static void __iomem *early_base;
static void (*printch)(char ch);
/*
* PL011 single character TX.
*/
static void pl011_printch(char ch)
{
while (readl_relaxed(early_base + UART01x_FR) & UART01x_FR_TXFF)
;
writeb_relaxed(ch, early_base + UART01x_DR);
while (readl_relaxed(early_base + UART01x_FR) & UART01x_FR_BUSY)
;
}
/*
* Semihosting-based debug console
*/
static void smh_printch(char ch)
{
asm volatile("mov x1, %0\n"
"mov x0, #3\n"
"hlt 0xf000\n"
: : "r" (&ch) : "x0", "x1", "memory");
}
/*
* 8250/16550 (8-bit aligned registers) single character TX.
*/
static void uart8250_8bit_printch(char ch)
{
while (!(readb_relaxed(early_base + UART_LSR) & UART_LSR_THRE))
;
writeb_relaxed(ch, early_base + UART_TX);
}
/*
* 8250/16550 (32-bit aligned registers) single character TX.
*/
static void uart8250_32bit_printch(char ch)
{
while (!(readl_relaxed(early_base + (UART_LSR << 2)) & UART_LSR_THRE))
;
writel_relaxed(ch, early_base + (UART_TX << 2));
}
struct earlycon_match {
const char *name;
void (*printch)(char ch);
};
static const struct earlycon_match earlycon_match[] __initconst = {
{ .name = "pl011", .printch = pl011_printch, },
{ .name = "smh", .printch = smh_printch, },
{ .name = "uart8250-8bit", .printch = uart8250_8bit_printch, },
{ .name = "uart8250-32bit", .printch = uart8250_32bit_printch, },
{}
};
static void early_write(struct console *con, const char *s, unsigned n)
{
while (n-- > 0) {
if (*s == '\n')
printch('\r');
printch(*s);
s++;
}
}
static struct console early_console_dev = {
.name = "earlycon",
.write = early_write,
.flags = CON_PRINTBUFFER | CON_BOOT,
.index = -1,
};
/*
* Parse earlyprintk=... parameter in the format:
*
* <name>[,<addr>][,<options>]
*
* and register the early console. It is assumed that the UART has been
* initialised by the bootloader already.
*/
static int __init setup_early_printk(char *buf)
{
const struct earlycon_match *match = earlycon_match;
phys_addr_t paddr = 0;
if (!buf) {
pr_warning("No earlyprintk arguments passed.\n");
return 0;
}
while (match->name) {
size_t len = strlen(match->name);
if (!strncmp(buf, match->name, len)) {
buf += len;
break;
}
match++;
}
if (!match->name) {
pr_warning("Unknown earlyprintk arguments: %s\n", buf);
return 0;
}
/* I/O address */
if (!strncmp(buf, ",0x", 3)) {
char *e;
paddr = simple_strtoul(buf + 1, &e, 16);
buf = e;
}
/* no options parsing yet */
if (paddr)
early_base = (void __iomem *)set_fixmap_offset_io(FIX_EARLYCON_MEM_BASE, paddr);
printch = match->printch;
early_console = &early_console_dev;
register_console(&early_console_dev);
return 0;
}
early_param("earlyprintk", setup_early_printk);

3
arch/x86/Kconfig
View File

@ -261,6 +261,9 @@ config ARCH_HWEIGHT_CFLAGS
config ARCH_SUPPORTS_UPROBES
def_bool y
config FIX_EARLYCON_MEM
def_bool y
source "init/Kconfig"
source "kernel/Kconfig.freezer"

24
drivers/bluetooth/hci_ldisc.c
View File

@ -118,10 +118,6 @@ static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
int hci_uart_tx_wakeup(struct hci_uart *hu)
{
struct tty_struct *tty = hu->tty;
struct hci_dev *hdev = hu->hdev;
struct sk_buff *skb;
if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
return 0;
@ -129,6 +125,22 @@ int hci_uart_tx_wakeup(struct hci_uart *hu)
BT_DBG("");
schedule_work(&hu->write_work);
return 0;
}
static void hci_uart_write_work(struct work_struct *work)
{
struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
struct tty_struct *tty = hu->tty;
struct hci_dev *hdev = hu->hdev;
struct sk_buff *skb;
/* REVISIT: should we cope with bad skbs or ->write() returning
* and error value ?
*/
restart:
clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
@ -153,7 +165,6 @@ int hci_uart_tx_wakeup(struct hci_uart *hu)
goto restart;
clear_bit(HCI_UART_SENDING, &hu->tx_state);
return 0;
}
static void hci_uart_init_work(struct work_struct *work)
@ -282,6 +293,7 @@ static int hci_uart_tty_open(struct tty_struct *tty)
tty->receive_room = 65536;
INIT_WORK(&hu->init_ready, hci_uart_init_work);
INIT_WORK(&hu->write_work, hci_uart_write_work);
spin_lock_init(&hu->rx_lock);
@ -319,6 +331,8 @@ static void hci_uart_tty_close(struct tty_struct *tty)
if (hdev)
hci_uart_close(hdev);
cancel_work_sync(&hu->write_work);
if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
if (hdev) {
if (test_bit(HCI_UART_REGISTERED, &hu->flags))

1
drivers/bluetooth/hci_uart.h
View File

@ -68,6 +68,7 @@ struct hci_uart {
unsigned long hdev_flags;
struct work_struct init_ready;
struct work_struct write_work;
struct hci_uart_proto *proto;
void *priv;

5
drivers/tty/serial/8250/8250_core.c
View File

@ -1926,13 +1926,8 @@ static void serial8250_put_poll_char(struct uart_port *port,
wait_for_xmitr(up, BOTH_EMPTY);
/*
* Send the character out.
* If a LF, also do CR...
*/
serial_port_out(port, UART_TX, c);
if (c == 10) {
wait_for_xmitr(up, BOTH_EMPTY);
serial_port_out(port, UART_TX, 13);
}
/*
* Finally, wait for transmitter to become empty

81
drivers/tty/serial/8250/8250_dw.c
View File

@ -62,6 +62,70 @@ struct dw8250_data {
struct uart_8250_dma dma;
};
struct dw8250_acpi_desc {
void (*set_termios)(struct uart_port *p, struct ktermios *termios,
struct ktermios *old);
};
#define BYT_PRV_CLK 0x800
#define BYT_PRV_CLK_EN (1 << 0)
#define BYT_PRV_CLK_M_VAL_SHIFT 1
#define BYT_PRV_CLK_N_VAL_SHIFT 16
#define BYT_PRV_CLK_UPDATE (1 << 31)
static void byt_set_termios(struct uart_port *p, struct ktermios *termios,
struct ktermios *old)
{
unsigned int baud = tty_termios_baud_rate(termios);
unsigned int m, n;
u32 reg;
/*
* For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the
* dividers must be adjusted.
*
* uartclk = (m / n) * 100 MHz, where m <= n
*/
switch (baud) {
case 500000:
case 1000000:
case 2000000:
case 4000000:
m = 64;
n = 100;
p->uartclk = 64000000;
break;
case 3500000:
m = 56;
n = 100;
p->uartclk = 56000000;
break;
case 1500000:
case 3000000:
m = 48;
n = 100;
p->uartclk = 48000000;
break;
case 2500000:
m = 40;
n = 100;
p->uartclk = 40000000;
break;
default:
m = 2304;
n = 3125;
p->uartclk = 73728000;
}
/* Reset the clock */
reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT);
writel(reg, p->membase + BYT_PRV_CLK);
reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE;
writel(reg, p->membase + BYT_PRV_CLK);
serial8250_do_set_termios(p, termios, old);
}
static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value)
{
struct dw8250_data *d = p->private_data;
@ -278,6 +342,7 @@ static int dw8250_probe_acpi(struct uart_8250_port *up,
{
const struct acpi_device_id *id;
struct uart_port *p = &up->port;
struct dw8250_acpi_desc *acpi_desc;
dw8250_setup_port(up);
@ -290,14 +355,18 @@ static int dw8250_probe_acpi(struct uart_8250_port *up,
p->serial_out = dw8250_serial_out32;
p->regshift = 2;
if (!p->uartclk)
p->uartclk = (unsigned int)id->driver_data;
up->dma = &data->dma;
up->dma->rxconf.src_maxburst = p->fifosize / 4;
up->dma->txconf.dst_maxburst = p->fifosize / 4;
acpi_desc = (struct dw8250_acpi_desc *)id->driver_data;
if (!acpi_desc)
return 0;
if (acpi_desc->set_termios)
p->set_termios = acpi_desc->set_termios;
return 0;
}
@ -445,12 +514,16 @@ static const struct of_device_id dw8250_of_match[] = {
};
MODULE_DEVICE_TABLE(of, dw8250_of_match);
static struct dw8250_acpi_desc byt_8250_desc = {
.set_termios = byt_set_termios,
};
static const struct acpi_device_id dw8250_acpi_match[] = {
{ "INT33C4", 0 },
{ "INT33C5", 0 },
{ "INT3434", 0 },
{ "INT3435", 0 },
{ "80860F0A", 0 },
{ "80860F0A", (kernel_ulong_t)&byt_8250_desc},
{ },
};
MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match);

138
drivers/tty/serial/8250/8250_early.c
View File

@ -35,18 +35,8 @@
#include <linux/serial_8250.h>
#include <asm/io.h>
#include <asm/serial.h>
#ifdef CONFIG_FIX_EARLYCON_MEM
#include <asm/pgtable.h>
#include <asm/fixmap.h>
#endif
struct early_serial8250_device {
struct uart_port port;
char options[16]; /* e.g., 115200n8 */
unsigned int baud;
};
static struct early_serial8250_device early_device;
static struct earlycon_device *early_device;
unsigned int __weak __init serial8250_early_in(struct uart_port *port, int offset)
{
@ -100,7 +90,7 @@ static void __init serial_putc(struct uart_port *port, int c)
static void __init early_serial8250_write(struct console *console,
const char *s, unsigned int count)
{
struct uart_port *port = &early_device.port;
struct uart_port *port = &early_device->port;
unsigned int ier;
/* Save the IER and disable interrupts */
@ -129,7 +119,7 @@ static unsigned int __init probe_baud(struct uart_port *port)
return (port->uartclk / 16) / quot;
}
static void __init init_port(struct early_serial8250_device *device)
static void __init init_port(struct earlycon_device *device)
{
struct uart_port *port = &device->port;
unsigned int divisor;
@ -148,128 +138,42 @@ static void __init init_port(struct early_serial8250_device *device)
serial8250_early_out(port, UART_LCR, c & ~UART_LCR_DLAB);
}
static int __init parse_options(struct early_serial8250_device *device,
char *options)
static int __init early_serial8250_setup(struct earlycon_device *device,
const char *options)
{
struct uart_port *port = &device->port;
int mmio, mmio32, length;
if (!options)
return -ENODEV;
port->uartclk = BASE_BAUD * 16;
mmio = !strncmp(options, "mmio,", 5);
mmio32 = !strncmp(options, "mmio32,", 7);
if (mmio || mmio32) {
port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32);
port->mapbase = simple_strtoul(options + (mmio ? 5 : 7),
&options, 0);
if (mmio32)
port->regshift = 2;
#ifdef CONFIG_FIX_EARLYCON_MEM
set_fixmap_nocache(FIX_EARLYCON_MEM_BASE,
port->mapbase & PAGE_MASK);
port->membase =
(void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
port->membase += port->mapbase & ~PAGE_MASK;
#else
port->membase = ioremap_nocache(port->mapbase, 64);
if (!port->membase) {
printk(KERN_ERR "%s: Couldn't ioremap 0x%llx\n",
__func__,
(unsigned long long) port->mapbase);
return -ENOMEM;
}
#endif
} else if (!strncmp(options, "io,", 3)) {
port->iotype = UPIO_PORT;
port->iobase = simple_strtoul(options + 3, &options, 0);
mmio = 0;
} else
return -EINVAL;
options = strchr(options, ',');
if (options) {
options++;
device->baud = simple_strtoul(options, NULL, 0);
length = min(strcspn(options, " ") + 1,
(size_t)(sizeof(device->options)));
strlcpy(device->options, options, length);
} else {
device->baud = probe_baud(port);
snprintf(device->options, sizeof(device->options), "%u",
device->baud);
}
if (mmio || mmio32)
printk(KERN_INFO
"Early serial console at MMIO%s 0x%llx (options '%s')\n",
mmio32 ? "32" : "",
(unsigned long long)port->mapbase,
device->options);
else
printk(KERN_INFO
"Early serial console at I/O port 0x%lx (options '%s')\n",
port->iobase,
device->options);
return 0;
}
static struct console early_serial8250_console __initdata = {
.name = "uart",
.write = early_serial8250_write,
.flags = CON_PRINTBUFFER | CON_BOOT,
.index = -1,
};
static int __init early_serial8250_setup(char *options)
{
struct early_serial8250_device *device = &early_device;
int err;
if (device->port.membase || device->port.iobase)
if (!(device->port.membase || device->port.iobase))
return 0;
err = parse_options(device, options);
if (err < 0)
return err;
if (!device->baud)
device->baud = probe_baud(&device->port);
init_port(device);
early_device = device;
device->con->write = early_serial8250_write;
return 0;
}
EARLYCON_DECLARE(uart8250, early_serial8250_setup);
EARLYCON_DECLARE(uart, early_serial8250_setup);
int __init setup_early_serial8250_console(char *cmdline)
{
char *options;
int err;
char match[] = "uart8250";
options = strstr(cmdline, "uart8250,");
if (!options) {
options = strstr(cmdline, "uart,");
if (!options)
return 0;
}
if (cmdline && cmdline[4] == ',')
match[4] = '\0';
options = strchr(cmdline, ',') + 1;
err = early_serial8250_setup(options);
if (err < 0)
return err;
register_console(&early_serial8250_console);
return 0;
return setup_earlycon(cmdline, match, early_serial8250_setup);
}
int serial8250_find_port_for_earlycon(void)
{
struct early_serial8250_device *device = &early_device;
struct uart_port *port = &device->port;
struct earlycon_device *device = early_device;
struct uart_port *port = device ? &device->port : NULL;
int line;
int ret;
if (!device->port.membase && !device->port.iobase)
if (!port || (!port->membase && !port->iobase))
return -ENODEV;
line = serial8250_find_port(port);
@ -284,5 +188,3 @@ int serial8250_find_port_for_earlycon(void)
return ret;
}
early_param("earlycon", setup_early_serial8250_console);

6
drivers/tty/serial/8250/Kconfig
View File

@ -61,6 +61,7 @@ config SERIAL_8250_CONSOLE
bool "Console on 8250/16550 and compatible serial port"
depends on SERIAL_8250=y
select SERIAL_CORE_CONSOLE
select SERIAL_EARLYCON
---help---
If you say Y here, it will be possible to use a serial port as the
system console (the system console is the device which receives all
@ -90,11 +91,6 @@ config SERIAL_8250_CONSOLE
If unsure, say N.
config FIX_EARLYCON_MEM
bool
depends on X86
default y
config SERIAL_8250_GSC
tristate
depends on SERIAL_8250 && GSC

47
drivers/tty/serial/Kconfig
View File

@ -7,6 +7,13 @@ if TTY
menu "Serial drivers"
depends on HAS_IOMEM
config SERIAL_EARLYCON
bool
help
Support for early consoles with the earlycon parameter. This enables
the console before standard serial driver is probed. The console is
enabled when early_param is processed.
source "drivers/tty/serial/8250/Kconfig"
comment "Non-8250 serial port support"
@ -53,6 +60,7 @@ config SERIAL_AMBA_PL011_CONSOLE
bool "Support for console on AMBA serial port"
depends on SERIAL_AMBA_PL011=y
select SERIAL_CORE_CONSOLE
select SERIAL_EARLYCON
---help---
Say Y here if you wish to use an AMBA PrimeCell UART as the system
console (the system console is the device which receives all kernel
@ -65,6 +73,16 @@ config SERIAL_AMBA_PL011_CONSOLE
your boot loader (lilo or loadlin) about how to pass options to the
kernel at boot time.)
config SERIAL_EARLYCON_ARM_SEMIHOST
bool "Early console using ARM semihosting"
depends on ARM64 || ARM
select SERIAL_EARLYCON
help
Support for early debug console using ARM semihosting. This enables
the console before standard serial driver is probed. This is enabled
with "earlycon=smh" on the kernel command line. The console is
enabled when early_param is processed.
config SERIAL_SB1250_DUART
tristate "BCM1xxx on-chip DUART serial support"
depends on SIBYTE_SB1xxx_SOC=y
@ -1160,6 +1178,16 @@ config SERIAL_SCCNXP_CONSOLE
help
Support for console on SCCNXP serial ports.
config SERIAL_SC16IS7XX
tristate "SC16IS7xx serial support"
depends on I2C
select SERIAL_CORE
select REGMAP_I2C if I2C
help
This selects support for SC16IS7xx serial ports.
Supported ICs are SC16IS740, SC16IS741, SC16IS750, SC16IS752,
SC16IS760 and SC16IS762.
config SERIAL_BFIN_SPORT
tristate "Blackfin SPORT emulate UART"
depends on BLACKFIN
@ -1369,18 +1397,19 @@ config SERIAL_MXS_AUART_CONSOLE
Enable a MXS AUART port to be the system console.
config SERIAL_XILINX_PS_UART
tristate "Xilinx PS UART support"
tristate "Cadence (Xilinx Zynq) UART support"
depends on OF
select SERIAL_CORE
help
This driver supports the Xilinx PS UART port.
This driver supports the Cadence UART. It is found e.g. in Xilinx
Zynq.
config SERIAL_XILINX_PS_UART_CONSOLE
bool "Xilinx PS UART console support"
bool "Cadence UART console support"
depends on SERIAL_XILINX_PS_UART=y
select SERIAL_CORE_CONSOLE
help
Enable a Xilinx PS UART port to be the system console.
Enable a Cadence UART port to be the system console.
config SERIAL_AR933X
tristate "AR933X serial port support"
@ -1508,6 +1537,16 @@ config SERIAL_ST_ASC_CONSOLE
depends on SERIAL_ST_ASC=y
select SERIAL_CORE_CONSOLE
config SERIAL_MEN_Z135
tristate "MEN 16z135 Support"
depends on MCB
help
Say yes here to enable support for the MEN 16z135 High Speed UART IP-Core
on a MCB carrier.
This driver can also be build as a module. If so, the module will be called
men_z135_uart.ko
endmenu
endif # TTY

5
drivers/tty/serial/Makefile
View File

@ -5,6 +5,9 @@
obj-$(CONFIG_SERIAL_CORE) += serial_core.o
obj-$(CONFIG_SERIAL_21285) += 21285.o
obj-$(CONFIG_SERIAL_EARLYCON) += earlycon.o
obj-$(CONFIG_SERIAL_EARLYCON_ARM_SEMIHOST) += earlycon-arm-semihost.o
# These Sparc drivers have to appear before others such as 8250
# which share ttySx minor node space. Otherwise console device
# names change and other unplesantries.
@ -48,6 +51,7 @@ obj-$(CONFIG_SERIAL_MPSC) += mpsc.o
obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o
obj-$(CONFIG_ETRAX_SERIAL) += crisv10.o
obj-$(CONFIG_SERIAL_SCCNXP) += sccnxp.o
obj-$(CONFIG_SERIAL_SC16IS7XX) += sc16is7xx.o
obj-$(CONFIG_SERIAL_JSM) += jsm/
obj-$(CONFIG_SERIAL_TXX9) += serial_txx9.o
obj-$(CONFIG_SERIAL_VR41XX) += vr41xx_siu.o
@ -87,3 +91,4 @@ obj-$(CONFIG_SERIAL_EFM32_UART) += efm32-uart.o
obj-$(CONFIG_SERIAL_ARC) += arc_uart.o
obj-$(CONFIG_SERIAL_RP2) += rp2.o
obj-$(CONFIG_SERIAL_FSL_LPUART) += fsl_lpuart.o
obj-$(CONFIG_SERIAL_MEN_Z135) += men_z135_uart.o

30
drivers/tty/serial/amba-pl011.c
View File

@ -303,7 +303,7 @@ static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port *
/* Optionally make use of an RX channel as well */
chan = dma_request_slave_channel(dev, "rx");
if (!chan && plat->dma_rx_param) {
chan = dma_request_channel(mask, plat->dma_filter, plat->dma_rx_param);
@ -2045,6 +2045,34 @@ static struct console amba_console = {
};
#define AMBA_CONSOLE (&amba_console)
static void pl011_putc(struct uart_port *port, int c)
{
while (readl(port->membase + UART01x_FR) & UART01x_FR_TXFF)
;
writeb(c, port->membase + UART01x_DR);
while (readl(port->membase + UART01x_FR) & UART01x_FR_BUSY)
;
}
static void pl011_early_write(struct console *con, const char *s, unsigned n)
{
struct earlycon_device *dev = con->data;
uart_console_write(&dev->port, s, n, pl011_putc);
}
static int __init pl011_early_console_setup(struct earlycon_device *device,
const char *opt)
{
if (!device->port.membase)
return -ENODEV;
device->con->write = pl011_early_write;
return 0;
}
EARLYCON_DECLARE(pl011, pl011_early_console_setup);
#else
#define AMBA_CONSOLE NULL
#endif

61
drivers/tty/serial/earlycon-arm-semihost.c Normal file
View File

@ -0,0 +1,61 @@
/*
* Copyright (C) 2012 ARM Ltd.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* Adapted for ARM and earlycon:
* Copyright (C) 2014 Linaro Ltd.
* Author: Rob Herring <robh@kernel.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/serial_core.h>
#ifdef CONFIG_THUMB2_KERNEL
#define SEMIHOST_SWI "0xab"
#else
#define SEMIHOST_SWI "0x123456"
#endif
/*
* Semihosting-based debug console
*/
static void smh_putc(struct uart_port *port, int c)
{
#ifdef CONFIG_ARM64
asm volatile("mov x1, %0\n"
"mov x0, #3\n"
"hlt 0xf000\n"
: : "r" (&c) : "x0", "x1", "memory");
#else
asm volatile("mov r1, %0\n"
"mov r0, #3\n"
"svc " SEMIHOST_SWI "\n"
: : "r" (&c) : "r0", "r1", "memory");
#endif
}
static void smh_write(struct console *con, const char *s, unsigned n)
{
struct earlycon_device *dev = con->data;
uart_console_write(&dev->port, s, n, smh_putc);
}
int __init early_smh_setup(struct earlycon_device *device, const char *opt)
{
device->con->write = smh_write;
return 0;
}
EARLYCON_DECLARE(smh, early_smh_setup);

144
drivers/tty/serial/earlycon.c Normal file
View File

@ -0,0 +1,144 @@
/*
* Copyright (C) 2014 Linaro Ltd.
* Author: Rob Herring <robh@kernel.org>
*
* Based on 8250 earlycon:
* (c) Copyright 2004 Hewlett-Packard Development Company, L.P.
* Bjorn Helgaas <bjorn.helgaas@hp.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/console.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/serial_core.h>
#ifdef CONFIG_FIX_EARLYCON_MEM
#include <asm/fixmap.h>
#endif
#include <asm/serial.h>
static struct console early_con = {
.name = "earlycon",
.flags = CON_PRINTBUFFER | CON_BOOT,
.index = -1,
};
static struct earlycon_device early_console_dev = {
.con = &early_con,
};
static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
{
void __iomem *base;
#ifdef CONFIG_FIX_EARLYCON_MEM
set_fixmap_io(FIX_EARLYCON_MEM_BASE, paddr & PAGE_MASK);
base = (void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
base += paddr & ~PAGE_MASK;
#else
base = ioremap(paddr, size);
#endif
if (!base)
pr_err("%s: Couldn't map 0x%llx\n", __func__,
(unsigned long long)paddr);
return base;
}
static int __init parse_options(struct earlycon_device *device,
char *options)
{
struct uart_port *port = &device->port;
int mmio, mmio32, length;
unsigned long addr;
if (!options)
return -ENODEV;
mmio = !strncmp(options, "mmio,", 5);
mmio32 = !strncmp(options, "mmio32,", 7);
if (mmio || mmio32) {
port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32);
options += mmio ? 5 : 7;
addr = simple_strtoul(options, NULL, 0);
port->mapbase = addr;
if (mmio32)
port->regshift = 2;
} else if (!strncmp(options, "io,", 3)) {
port->iotype = UPIO_PORT;
options += 3;
addr = simple_strtoul(options, NULL, 0);
port->iobase = addr;
mmio = 0;
} else if (!strncmp(options, "0x", 2)) {
port->iotype = UPIO_MEM;
addr = simple_strtoul(options, NULL, 0);
port->mapbase = addr;
} else {
return -EINVAL;
}
port->uartclk = BASE_BAUD * 16;
options = strchr(options, ',');
if (options) {
options++;
device->baud = simple_strtoul(options, NULL, 0);
length = min(strcspn(options, " ") + 1,
(size_t)(sizeof(device->options)));
strlcpy(device->options, options, length);
}
if (mmio || mmio32)
pr_info("Early serial console at MMIO%s 0x%llx (options '%s')\n",
mmio32 ? "32" : "",
(unsigned long long)port->mapbase,
device->options);
else
pr_info("Early serial console at I/O port 0x%lx (options '%s')\n",
port->iobase,
device->options);
return 0;
}
int __init setup_earlycon(char *buf, const char *match,
int (*setup)(struct earlycon_device *, const char *))
{
int err;
size_t len;
struct uart_port *port = &early_console_dev.port;
if (!buf || !match || !setup)
return 0;
len = strlen(match);
if (strncmp(buf, match, len))
return 0;
if (buf[len] && (buf[len] != ','))
return 0;
buf += len + 1;
err = parse_options(&early_console_dev, buf);
/* On parsing error, pass the options buf to the setup function */
if (!err)
buf = NULL;
if (port->mapbase)
port->membase = earlycon_map(port->mapbase, 64);
early_console_dev.con->data = &early_console_dev;
err = setup(&early_console_dev, buf);
if (err < 0)
return err;
if (!early_console_dev.con->write)
return -ENODEV;
register_console(early_console_dev.con);
return 0;
}

866
drivers/tty/serial/men_z135_uart.c Normal file
View File

@ -0,0 +1,866 @@
/*
* MEN 16z135 High Speed UART
*
* Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
* Author: Johannes Thumshirn <johannes.thumshirn@men.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; version 2 of the License.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":" fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/serial_core.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/tty_flip.h>
#include <linux/bitops.h>
#include <linux/mcb.h>
#define MEN_Z135_MAX_PORTS 12
#define MEN_Z135_BASECLK 29491200
#define MEN_Z135_FIFO_SIZE 1024
#define MEN_Z135_NUM_MSI_VECTORS 2
#define MEN_Z135_FIFO_WATERMARK 1020
#define MEN_Z135_STAT_REG 0x0
#define MEN_Z135_RX_RAM 0x4
#define MEN_Z135_TX_RAM 0x400
#define MEN_Z135_RX_CTRL 0x800
#define MEN_Z135_TX_CTRL 0x804
#define MEN_Z135_CONF_REG 0x808
#define MEN_Z135_UART_FREQ 0x80c
#define MEN_Z135_BAUD_REG 0x810
#define MENZ135_TIMEOUT 0x814
#define MEN_Z135_MEM_SIZE 0x818
#define IS_IRQ(x) ((x) & 1)
#define IRQ_ID(x) (((x) >> 1) & 7)
#define MEN_Z135_IER_RXCIEN BIT(0) /* TX Space IRQ */
#define MEN_Z135_IER_TXCIEN BIT(1) /* RX Space IRQ */
#define MEN_Z135_IER_RLSIEN BIT(2) /* Receiver Line Status IRQ */
#define MEN_Z135_IER_MSIEN BIT(3) /* Modem Status IRQ */
#define MEN_Z135_ALL_IRQS (MEN_Z135_IER_RXCIEN \
| MEN_Z135_IER_RLSIEN \
| MEN_Z135_IER_MSIEN \
| MEN_Z135_IER_TXCIEN)
#define MEN_Z135_MCR_DTR BIT(24)
#define MEN_Z135_MCR_RTS BIT(25)
#define MEN_Z135_MCR_OUT1 BIT(26)
#define MEN_Z135_MCR_OUT2 BIT(27)
#define MEN_Z135_MCR_LOOP BIT(28)
#define MEN_Z135_MCR_RCFC BIT(29)
#define MEN_Z135_MSR_DCTS BIT(0)
#define MEN_Z135_MSR_DDSR BIT(1)
#define MEN_Z135_MSR_DRI BIT(2)
#define MEN_Z135_MSR_DDCD BIT(3)
#define MEN_Z135_MSR_CTS BIT(4)
#define MEN_Z135_MSR_DSR BIT(5)
#define MEN_Z135_MSR_RI BIT(6)
#define MEN_Z135_MSR_DCD BIT(7)
#define MEN_Z135_LCR_SHIFT 8 /* LCR shift mask */
#define MEN_Z135_WL5 0 /* CS5 */
#define MEN_Z135_WL6 1 /* CS6 */
#define MEN_Z135_WL7 2 /* CS7 */
#define MEN_Z135_WL8 3 /* CS8 */
#define MEN_Z135_STB_SHIFT 2 /* Stopbits */
#define MEN_Z135_NSTB1 0
#define MEN_Z135_NSTB2 1
#define MEN_Z135_PEN_SHIFT 3 /* Parity enable */
#define MEN_Z135_PAR_DIS 0
#define MEN_Z135_PAR_ENA 1
#define MEN_Z135_PTY_SHIFT 4 /* Parity type */
#define MEN_Z135_PTY_ODD 0
#define MEN_Z135_PTY_EVN 1
#define MEN_Z135_LSR_DR BIT(0)
#define MEN_Z135_LSR_OE BIT(1)
#define MEN_Z135_LSR_PE BIT(2)
#define MEN_Z135_LSR_FE BIT(3)
#define MEN_Z135_LSR_BI BIT(4)
#define MEN_Z135_LSR_THEP BIT(5)
#define MEN_Z135_LSR_TEXP BIT(6)
#define MEN_Z135_LSR_RXFIFOERR BIT(7)
#define MEN_Z135_IRQ_ID_MST 0
#define MEN_Z135_IRQ_ID_TSA 1
#define MEN_Z135_IRQ_ID_RDA 2
#define MEN_Z135_IRQ_ID_RLS 3
#define MEN_Z135_IRQ_ID_CTI 6
#define LCR(x) (((x) >> MEN_Z135_LCR_SHIFT) & 0xff)
#define BYTES_TO_ALIGN(x) ((x) & 0x3)
static int line;
static int txlvl = 5;
module_param(txlvl, int, S_IRUGO);
MODULE_PARM_DESC(txlvl, "TX IRQ trigger level 0-7, default 5 (128 byte)");
static int rxlvl = 6;
module_param(rxlvl, int, S_IRUGO);
MODULE_PARM_DESC(rxlvl, "RX IRQ trigger level 0-7, default 6 (256 byte)");
static int align;
module_param(align, int, S_IRUGO);
MODULE_PARM_DESC(align, "Keep hardware FIFO write pointer aligned, default 0");
struct men_z135_port {
struct uart_port port;
struct mcb_device *mdev;
unsigned char *rxbuf;
u32 stat_reg;
spinlock_t lock;
};
#define to_men_z135(port) container_of((port), struct men_z135_port, port)
/**
* men_z135_reg_set() - Set value in register
* @uart: The UART port
* @addr: Register address
* @val: value to set
*/
static inline void men_z135_reg_set(struct men_z135_port *uart,
u32 addr, u32 val)
{
struct uart_port *port = &uart->port;
unsigned long flags;
u32 reg;
spin_lock_irqsave(&uart->lock, flags);
reg = ioread32(port->membase + addr);
reg |= val;
iowrite32(reg, port->membase + addr);
spin_unlock_irqrestore(&uart->lock, flags);
}
/**
* men_z135_reg_clr() - Unset value in register
* @uart: The UART port
* @addr: Register address
* @val: value to clear
*/
static inline void men_z135_reg_clr(struct men_z135_port *uart,
u32 addr, u32 val)
{
struct uart_port *port = &uart->port;
unsigned long flags;
u32 reg;
spin_lock_irqsave(&uart->lock, flags);
reg = ioread32(port->membase + addr);
reg &= ~val;
iowrite32(reg, port->membase + addr);
spin_unlock_irqrestore(&uart->lock, flags);
}
/**
* men_z135_handle_modem_status() - Handle change of modem status
* @port: The UART port
*
* Handle change of modem status register. This is done by reading the "delta"
* versions of DCD (Data Carrier Detect) and CTS (Clear To Send).
*/
static void men_z135_handle_modem_status(struct men_z135_port *uart)
{
if (uart->stat_reg & MEN_Z135_MSR_DDCD)
uart_handle_dcd_change(&uart->port,
uart->stat_reg & ~MEN_Z135_MSR_DCD);
if (uart->stat_reg & MEN_Z135_MSR_DCTS)
uart_handle_cts_change(&uart->port,
uart->stat_reg & ~MEN_Z135_MSR_CTS);
}
static void men_z135_handle_lsr(struct men_z135_port *uart)
{
struct uart_port *port = &uart->port;
u8 lsr;
lsr = (uart->stat_reg >> 16) & 0xff;
if (lsr & MEN_Z135_LSR_OE)
port->icount.overrun++;
if (lsr & MEN_Z135_LSR_PE)
port->icount.parity++;
if (lsr & MEN_Z135_LSR_FE)
port->icount.frame++;
if (lsr & MEN_Z135_LSR_BI) {
port->icount.brk++;
uart_handle_break(port);
}
}
/**
* get_rx_fifo_content() - Get the number of bytes in RX FIFO
* @uart: The UART port
*
* Read RXC register from hardware and return current FIFO fill size.
*/
static u16 get_rx_fifo_content(struct men_z135_port *uart)
{
struct uart_port *port = &uart->port;
u32 stat_reg;
u16 rxc;
u8 rxc_lo;
u8 rxc_hi;
stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
rxc_lo = stat_reg >> 24;
rxc_hi = (stat_reg & 0xC0) >> 6;
rxc = rxc_lo | (rxc_hi << 8);
return rxc;
}
/**
* men_z135_handle_rx() - RX tasklet routine
* @arg: Pointer to struct men_z135_port
*
* Copy from RX FIFO and acknowledge number of bytes copied.
*/
static void men_z135_handle_rx(struct men_z135_port *uart)
{
struct uart_port *port = &uart->port;
struct tty_port *tport = &port->state->port;
int copied;
u16 size;
int room;
size = get_rx_fifo_content(uart);
if (size == 0)
return;
/* Avoid accidently accessing TX FIFO instead of RX FIFO. Last
* longword in RX FIFO cannot be read.(0x004-0x3FF)
*/
if (size > MEN_Z135_FIFO_WATERMARK)
size = MEN_Z135_FIFO_WATERMARK;
room = tty_buffer_request_room(tport, size);
if (room != size)
dev_warn(&uart->mdev->dev,
"Not enough room in flip buffer, truncating to %d\n",
room);
if (room == 0)
return;
memcpy_fromio(uart->rxbuf, port->membase + MEN_Z135_RX_RAM, room);
/* Be sure to first copy all data and then acknowledge it */
mb();
iowrite32(room, port->membase + MEN_Z135_RX_CTRL);
copied = tty_insert_flip_string(tport, uart->rxbuf, room);
if (copied != room)
dev_warn(&uart->mdev->dev,
"Only copied %d instead of %d bytes\n",
copied, room);
port->icount.rx += copied;
tty_flip_buffer_push(tport);
}
/**
* men_z135_handle_tx() - TX tasklet routine
* @arg: Pointer to struct men_z135_port
*
*/
static void men_z135_handle_tx(struct men_z135_port *uart)
{
struct uart_port *port = &uart->port;
struct circ_buf *xmit = &port->state->xmit;
u32 txc;
u32 wptr;
int qlen;
int n;
int txfree;
int head;
int tail;
int s;
if (uart_circ_empty(xmit))
goto out;
if (uart_tx_stopped(port))
goto out;
if (port->x_char)
goto out;
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
/* calculate bytes to copy */
qlen = uart_circ_chars_pending(xmit);
if (qlen <= 0)
goto out;
wptr = ioread32(port->membase + MEN_Z135_TX_CTRL);
txc = (wptr >> 16) & 0x3ff;
wptr &= 0x3ff;
if (txc > MEN_Z135_FIFO_WATERMARK)
txc = MEN_Z135_FIFO_WATERMARK;
txfree = MEN_Z135_FIFO_WATERMARK - txc;
if (txfree <= 0) {
pr_err("Not enough room in TX FIFO have %d, need %d\n",
txfree, qlen);
goto irq_en;
}
/* if we're not aligned, it's better to copy only 1 or 2 bytes and
* then the rest.
*/
if (align && qlen >= 3 && BYTES_TO_ALIGN(wptr))
n = 4 - BYTES_TO_ALIGN(wptr);
else if (qlen > txfree)
n = txfree;
else
n = qlen;
if (n <= 0)
goto irq_en;
head = xmit->head & (UART_XMIT_SIZE - 1);
tail = xmit->tail & (UART_XMIT_SIZE - 1);
s = ((head >= tail) ? head : UART_XMIT_SIZE) - tail;
n = min(n, s);
memcpy_toio(port->membase + MEN_Z135_TX_RAM, &xmit->buf[xmit->tail], n);
xmit->tail = (xmit->tail + n) & (UART_XMIT_SIZE - 1);
mmiowb();
iowrite32(n & 0x3ff, port->membase + MEN_Z135_TX_CTRL);
port->icount.tx += n;
irq_en:
if (!uart_circ_empty(xmit))
men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
else
men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
out:
return;
}
/**
* men_z135_intr() - Handle legacy IRQs
* @irq: The IRQ number
* @data: Pointer to UART port
*
* Check IIR register to see which tasklet to start.
*/
static irqreturn_t men_z135_intr(int irq, void *data)
{
struct men_z135_port *uart = (struct men_z135_port *)data;
struct uart_port *port = &uart->port;
int irq_id;
uart->stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
/* IRQ pending is low active */
if (IS_IRQ(uart->stat_reg))
return IRQ_NONE;
irq_id = IRQ_ID(uart->stat_reg);
switch (irq_id) {
case MEN_Z135_IRQ_ID_MST:
men_z135_handle_modem_status(uart);
break;
case MEN_Z135_IRQ_ID_TSA:
men_z135_handle_tx(uart);
break;
case MEN_Z135_IRQ_ID_CTI:
dev_dbg(&uart->mdev->dev, "Character Timeout Indication\n");
/* Fallthrough */
case MEN_Z135_IRQ_ID_RDA:
/* Reading data clears RX IRQ */
men_z135_handle_rx(uart);
break;
case MEN_Z135_IRQ_ID_RLS:
men_z135_handle_lsr(uart);
break;
default:
dev_warn(&uart->mdev->dev, "Unknown IRQ id %d\n", irq_id);
return IRQ_NONE;
}
return IRQ_HANDLED;
}
/**
* men_z135_request_irq() - Request IRQ for 16z135 core
* @uart: z135 private uart port structure
*
* Request an IRQ for 16z135 to use. First try using MSI, if it fails
* fall back to using legacy interrupts.
*/
static int men_z135_request_irq(struct men_z135_port *uart)
{
struct device *dev = &uart->mdev->dev;
struct uart_port *port = &uart->port;
int err = 0;
err = request_irq(port->irq, men_z135_intr, IRQF_SHARED,
"men_z135_intr", uart);
if (err)
dev_err(dev, "Error %d getting interrupt\n", err);
return err;
}
/**
* men_z135_tx_empty() - Handle tx_empty call
* @port: The UART port
*
* This function tests whether the TX FIFO and shifter for the port
* described by @port is empty.
*/
static unsigned int men_z135_tx_empty(struct uart_port *port)
{
u32 wptr;
u16 txc;
wptr = ioread32(port->membase + MEN_Z135_TX_CTRL);
txc = (wptr >> 16) & 0x3ff;
if (txc == 0)
return TIOCSER_TEMT;
else
return 0;
}
/**
* men_z135_set_mctrl() - Set modem control lines
* @port: The UART port
* @mctrl: The modem control lines
*
* This function sets the modem control lines for a port described by @port
* to the state described by @mctrl
*/
static void men_z135_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct men_z135_port *uart = to_men_z135(port);
u32 conf_reg = 0;
if (mctrl & TIOCM_RTS)
conf_reg |= MEN_Z135_MCR_RTS;
if (mctrl & TIOCM_DTR)
conf_reg |= MEN_Z135_MCR_DTR;
if (mctrl & TIOCM_OUT1)
conf_reg |= MEN_Z135_MCR_OUT1;
if (mctrl & TIOCM_OUT2)
conf_reg |= MEN_Z135_MCR_OUT2;
if (mctrl & TIOCM_LOOP)
conf_reg |= MEN_Z135_MCR_LOOP;
men_z135_reg_set(uart, MEN_Z135_CONF_REG, conf_reg);
}
/**
* men_z135_get_mctrl() - Get modem control lines
* @port: The UART port
*
* Retruns the current state of modem control inputs.
*/
static unsigned int men_z135_get_mctrl(struct uart_port *port)
{
unsigned int mctrl = 0;
u32 stat_reg;
u8 msr;
stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
msr = ~((stat_reg >> 8) & 0xff);
if (msr & MEN_Z135_MSR_CTS)
mctrl |= TIOCM_CTS;
if (msr & MEN_Z135_MSR_DSR)
mctrl |= TIOCM_DSR;
if (msr & MEN_Z135_MSR_RI)
mctrl |= TIOCM_RI;
if (msr & MEN_Z135_MSR_DCD)
mctrl |= TIOCM_CAR;
return mctrl;
}
/**
* men_z135_stop_tx() - Stop transmitting characters
* @port: The UART port
*
* Stop transmitting characters. This might be due to CTS line becomming
* inactive or the tty layer indicating we want to stop transmission due to
* an XOFF character.
*/
static void men_z135_stop_tx(struct uart_port *port)
{
struct men_z135_port *uart = to_men_z135(port);
men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
}
/**
* men_z135_start_tx() - Start transmitting characters
* @port: The UART port
*
* Start transmitting character. This actually doesn't transmit anything, but
* fires off the TX tasklet.
*/
static void men_z135_start_tx(struct uart_port *port)
{
struct men_z135_port *uart = to_men_z135(port);
men_z135_handle_tx(uart);
}
/**
* men_z135_stop_rx() - Stop receiving characters
* @port: The UART port
*
* Stop receiving characters; the port is in the process of being closed.
*/
static void men_z135_stop_rx(struct uart_port *port)
{
struct men_z135_port *uart = to_men_z135(port);
men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_RXCIEN);
}
/**
* men_z135_enable_ms() - Enable Modem Status
* port:
*
* Enable Modem Status IRQ.
*/
static void men_z135_enable_ms(struct uart_port *port)
{
struct men_z135_port *uart = to_men_z135(port);
men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_MSIEN);
}
static int men_z135_startup(struct uart_port *port)
{
struct men_z135_port *uart = to_men_z135(port);
int err;
u32 conf_reg = 0;
err = men_z135_request_irq(uart);
if (err)
return -ENODEV;
conf_reg = ioread32(port->membase + MEN_Z135_CONF_REG);
conf_reg |= MEN_Z135_ALL_IRQS;
conf_reg &= ~(0xff << 16);
conf_reg |= (txlvl << 16);
conf_reg |= (rxlvl << 20);
iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);
return 0;
}
static void men_z135_shutdown(struct uart_port *port)
{
struct men_z135_port *uart = to_men_z135(port);
u32 conf_reg = 0;
conf_reg |= MEN_Z135_ALL_IRQS;
men_z135_reg_clr(uart, MEN_Z135_CONF_REG, conf_reg);
free_irq(uart->port.irq, uart);
}
static void men_z135_set_termios(struct uart_port *port,
struct ktermios *termios,
struct ktermios *old)
{
unsigned int baud;
u32 conf_reg;
u32 bd_reg;
u32 uart_freq;
u8 lcr;
conf_reg = ioread32(port->membase + MEN_Z135_CONF_REG);
lcr = LCR(conf_reg);
/* byte size */
switch (termios->c_cflag & CSIZE) {
case CS5:
lcr |= MEN_Z135_WL5;
break;
case CS6:
lcr |= MEN_Z135_WL6;
break;
case CS7:
lcr |= MEN_Z135_WL7;
break;
case CS8:
lcr |= MEN_Z135_WL8;
break;
}
/* stop bits */
if (termios->c_cflag & CSTOPB)
lcr |= MEN_Z135_NSTB2 << MEN_Z135_STB_SHIFT;
/* parity */
if (termios->c_cflag & PARENB) {
lcr |= MEN_Z135_PAR_ENA << MEN_Z135_PEN_SHIFT;
if (termios->c_cflag & PARODD)
lcr |= MEN_Z135_PTY_ODD << MEN_Z135_PTY_SHIFT;
else
lcr |= MEN_Z135_PTY_EVN << MEN_Z135_PTY_SHIFT;
} else
lcr |= MEN_Z135_PAR_DIS << MEN_Z135_PEN_SHIFT;
termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
conf_reg |= lcr << MEN_Z135_LCR_SHIFT;
iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);
uart_freq = ioread32(port->membase + MEN_Z135_UART_FREQ);
if (uart_freq == 0)
uart_freq = MEN_Z135_BASECLK;
baud = uart_get_baud_rate(port, termios, old, 0, uart_freq / 16);
spin_lock(&port->lock);
if (tty_termios_baud_rate(termios))
tty_termios_encode_baud_rate(termios, baud, baud);
bd_reg = uart_freq / (4 * baud);
iowrite32(bd_reg, port->membase + MEN_Z135_BAUD_REG);
uart_update_timeout(port, termios->c_cflag, baud);
spin_unlock(&port->lock);
}
static const char *men_z135_type(struct uart_port *port)
{
return KBUILD_MODNAME;
}
static void men_z135_release_port(struct uart_port *port)
{
iounmap(port->membase);
port->membase = NULL;
release_mem_region(port->mapbase, MEN_Z135_MEM_SIZE);
}
static int men_z135_request_port(struct uart_port *port)
{
int size = MEN_Z135_MEM_SIZE;
if (!request_mem_region(port->mapbase, size, "men_z135_port"))
return -EBUSY;
port->membase = ioremap(port->mapbase, MEN_Z135_MEM_SIZE);
if (port->membase == NULL) {
release_mem_region(port->mapbase, MEN_Z135_MEM_SIZE);
return -ENOMEM;
}
return 0;
}
static void men_z135_config_port(struct uart_port *port, int type)
{
port->type = PORT_MEN_Z135;
men_z135_request_port(port);
}
static int men_z135_verify_port(struct uart_port *port,
struct serial_struct *serinfo)
{
return -EINVAL;
}
static struct uart_ops men_z135_ops = {
.tx_empty = men_z135_tx_empty,
.set_mctrl = men_z135_set_mctrl,
.get_mctrl = men_z135_get_mctrl,
.stop_tx = men_z135_stop_tx,
.start_tx = men_z135_start_tx,
.stop_rx = men_z135_stop_rx,
.enable_ms = men_z135_enable_ms,
.startup = men_z135_startup,
.shutdown = men_z135_shutdown,
.set_termios = men_z135_set_termios,
.type = men_z135_type,
.release_port = men_z135_release_port,
.request_port = men_z135_request_port,
.config_port = men_z135_config_port,
.verify_port = men_z135_verify_port,
};
static struct uart_driver men_z135_driver = {
.owner = THIS_MODULE,
.driver_name = KBUILD_MODNAME,
.dev_name = "ttyHSU",
.major = 0,
.minor = 0,
.nr = MEN_Z135_MAX_PORTS,
};
/**
* men_z135_probe() - Probe a z135 instance
* @mdev: The MCB device
* @id: The MCB device ID
*
* men_z135_probe does the basic setup of hardware resources and registers the
* new uart port to the tty layer.
*/
static int men_z135_probe(struct mcb_device *mdev,
const struct mcb_device_id *id)
{
struct men_z135_port *uart;
struct resource *mem;
struct device *dev;
int err;
dev = &mdev->dev;
uart = devm_kzalloc(dev, sizeof(struct men_z135_port), GFP_KERNEL);
if (!uart)
return -ENOMEM;
uart->rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
if (!uart->rxbuf)
return -ENOMEM;
mem = &mdev->mem;
mcb_set_drvdata(mdev, uart);
uart->port.uartclk = MEN_Z135_BASECLK * 16;
uart->port.fifosize = MEN_Z135_FIFO_SIZE;
uart->port.iotype = UPIO_MEM;
uart->port.ops = &men_z135_ops;
uart->port.irq = mcb_get_irq(mdev);
uart->port.iotype = UPIO_MEM;
uart->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
uart->port.line = line++;
uart->port.dev = dev;
uart->port.type = PORT_MEN_Z135;
uart->port.mapbase = mem->start;
uart->port.membase = NULL;
uart->mdev = mdev;
spin_lock_init(&uart->port.lock);
spin_lock_init(&uart->lock);
err = uart_add_one_port(&men_z135_driver, &uart->port);
if (err)
goto err;
return 0;
err:
free_page((unsigned long) uart->rxbuf);
dev_err(dev, "Failed to add UART: %d\n", err);
return err;
}
/**
* men_z135_remove() - Remove a z135 instance from the system
*
* @mdev: The MCB device
*/
static void men_z135_remove(struct mcb_device *mdev)
{
struct men_z135_port *uart = mcb_get_drvdata(mdev);
line--;
uart_remove_one_port(&men_z135_driver, &uart->port);
free_page((unsigned long) uart->rxbuf);
}
static const struct mcb_device_id men_z135_ids[] = {
{ .device = 0x87 },
};
MODULE_DEVICE_TABLE(mcb, men_z135_ids);
static struct mcb_driver mcb_driver = {
.driver = {
.name = "z135-uart",
.owner = THIS_MODULE,
},
.probe = men_z135_probe,
.remove = men_z135_remove,
.id_table = men_z135_ids,
};
/**
* men_z135_init() - Driver Registration Routine
*
* men_z135_init is the first routine called when the driver is loaded. All it
* does is register with the legacy MEN Chameleon subsystem.
*/
static int __init men_z135_init(void)
{
int err;
err = uart_register_driver(&men_z135_driver);
if (err) {
pr_err("Failed to register UART: %d\n", err);
return err;
}
err = mcb_register_driver(&mcb_driver);
if (err) {
pr_err("Failed to register MCB driver: %d\n", err);
uart_unregister_driver(&men_z135_driver);
return err;
}
return 0;
}
module_init(men_z135_init);
/**
* men_z135_exit() - Driver Exit Routine
*
* men_z135_exit is called just before the driver is removed from memory.
*/
static void __exit men_z135_exit(void)
{
mcb_unregister_driver(&mcb_driver);
uart_unregister_driver(&men_z135_driver);
}
module_exit(men_z135_exit);
MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MEN 16z135 High Speed UART");
MODULE_ALIAS("mcb:16z135");

4
drivers/tty/serial/mux.c
View File

@ -29,7 +29,7 @@
#include <asm/irq.h>
#include <asm/parisc-device.h>
#ifdef CONFIG_MAGIC_SYSRQ
#if defined(CONFIG_SERIAL_MUX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#include <linux/sysrq.h>
#define SUPPORT_SYSRQ
#endif
@ -613,7 +613,7 @@ static void __exit mux_exit(void)
{
/* Delete the Mux timer. */
if(port_cnt > 0) {
del_timer(&mux_timer);
del_timer_sync(&mux_timer);
#ifdef CONFIG_SERIAL_MUX_CONSOLE
unregister_console(&mux_console);
#endif

94
drivers/tty/serial/omap-serial.c
View File

@ -163,10 +163,6 @@ struct uart_omap_port {
u8 wakeups_enabled;
u32 features;
int DTR_gpio;
int DTR_inverted;
int DTR_active;
struct serial_rs485 rs485;
int rts_gpio;
@ -184,8 +180,6 @@ static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
/* Forward declaration of functions */
static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
static struct workqueue_struct *serial_omap_uart_wq;
static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
{
offset <<= up->port.regshift;
@ -398,11 +392,8 @@ static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
break;
} while (--count > 0);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
spin_unlock(&up->port.lock);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
spin_lock(&up->port.lock);
}
if (uart_circ_empty(xmit))
serial_omap_stop_tx(&up->port);
@ -697,16 +688,6 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
serial_out(up, UART_MCR, up->mcr);
pm_runtime_mark_last_busy(up->dev);
pm_runtime_put_autosuspend(up->dev);
if (gpio_is_valid(up->DTR_gpio) &&
!!(mctrl & TIOCM_DTR) != up->DTR_active) {
up->DTR_active = !up->DTR_active;
if (gpio_cansleep(up->DTR_gpio))
schedule_work(&up->qos_work);
else
gpio_set_value(up->DTR_gpio,
up->DTR_active != up->DTR_inverted);
}
}
static void serial_omap_break_ctl(struct uart_port *port, int break_state)
@ -850,9 +831,6 @@ static void serial_omap_uart_qos_work(struct work_struct *work)
qos_work);
pm_qos_update_request(&up->pm_qos_request, up->latency);
if (gpio_is_valid(up->DTR_gpio))
gpio_set_value_cansleep(up->DTR_gpio,
up->DTR_active != up->DTR_inverted);
}
static void
@ -1420,7 +1398,7 @@ serial_omap_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
switch (cmd) {
case TIOCSRS485:
if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
if (copy_from_user(&rs485conf, (void __user *) arg,
sizeof(rs485conf)))
return -EFAULT;
@ -1428,7 +1406,7 @@ serial_omap_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
break;
case TIOCGRS485:
if (copy_to_user((struct serial_rs485 *) arg,
if (copy_to_user((void __user *) arg,
&(to_uart_omap_port(port)->rs485),
sizeof(rs485conf)))
return -EFAULT;
@ -1614,7 +1592,7 @@ static int serial_omap_probe_rs485(struct uart_omap_port *up,
/* check for tx enable gpio */
up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags);
if (gpio_is_valid(up->rts_gpio)) {
ret = gpio_request(up->rts_gpio, "omap-serial");
ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial");
if (ret < 0)
return ret;
ret = gpio_direction_output(up->rts_gpio,
@ -1644,10 +1622,13 @@ static int serial_omap_probe_rs485(struct uart_omap_port *up,
static int serial_omap_probe(struct platform_device *pdev)
{
struct uart_omap_port *up;
struct resource *mem, *irq;
struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
int ret, uartirq = 0, wakeirq = 0;
struct uart_omap_port *up;
struct resource *mem;
void __iomem *base;
int uartirq = 0;
int wakeirq = 0;
int ret;
/* The optional wakeirq may be specified in the board dts file */
if (pdev->dev.of_node) {
@ -1658,48 +1639,19 @@ static int serial_omap_probe(struct platform_device *pdev)
omap_up_info = of_get_uart_port_info(&pdev->dev);
pdev->dev.platform_data = omap_up_info;
} else {
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!irq) {
dev_err(&pdev->dev, "no irq resource?\n");
return -ENODEV;
}
uartirq = irq->start;
}
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
dev_err(&pdev->dev, "no mem resource?\n");
return -ENODEV;
}
if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
pdev->dev.driver->name)) {
dev_err(&pdev->dev, "memory region already claimed\n");
return -EBUSY;
}
if (gpio_is_valid(omap_up_info->DTR_gpio) &&
omap_up_info->DTR_present) {
ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
if (ret < 0)
return ret;
ret = gpio_direction_output(omap_up_info->DTR_gpio,
omap_up_info->DTR_inverted);
if (ret < 0)
return ret;
uartirq = platform_get_irq(pdev, 0);
if (uartirq < 0)
return -EPROBE_DEFER;
}
up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
if (!up)
return -ENOMEM;
if (gpio_is_valid(omap_up_info->DTR_gpio) &&
omap_up_info->DTR_present) {
up->DTR_gpio = omap_up_info->DTR_gpio;
up->DTR_inverted = omap_up_info->DTR_inverted;
} else
up->DTR_gpio = -EINVAL;
up->DTR_active = 0;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(base))
return PTR_ERR(base);
up->dev = &pdev->dev;
up->port.dev = &pdev->dev;
@ -1733,14 +1685,7 @@ static int serial_omap_probe(struct platform_device *pdev)
sprintf(up->name, "OMAP UART%d", up->port.line);
up->port.mapbase = mem->start;
up->port.membase = devm_ioremap(&pdev->dev, mem->start,
resource_size(mem));
if (!up->port.membase) {
dev_err(&pdev->dev, "can't ioremap UART\n");
ret = -ENOMEM;
goto err_ioremap;
}
up->port.membase = base;
up->port.flags = omap_up_info->flags;
up->port.uartclk = omap_up_info->uartclk;
if (!up->port.uartclk) {
@ -1754,12 +1699,12 @@ static int serial_omap_probe(struct platform_device *pdev)
up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
pm_qos_add_request(&up->pm_qos_request,
PM_QOS_CPU_DMA_LATENCY, up->latency);
serial_omap_uart_wq = create_singlethread_workqueue(up->name);
INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
platform_set_drvdata(pdev, up);
if (omap_up_info->autosuspend_timeout == 0)
omap_up_info->autosuspend_timeout = -1;
device_init_wakeup(up->dev, true);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev,
@ -1786,7 +1731,6 @@ static int serial_omap_probe(struct platform_device *pdev)
err_add_port:
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
err_ioremap:
err_rs485:
err_port_line:
dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",

13
drivers/tty/serial/pch_uart.c
View File

@ -257,6 +257,8 @@ struct eg20t_port {
dma_addr_t rx_buf_dma;
struct dentry *debugfs;
#define IRQ_NAME_SIZE 17
char irq_name[IRQ_NAME_SIZE];
/* protect the eg20t_port private structure and io access to membase */
spinlock_t lock;
@ -1343,7 +1345,7 @@ static int pch_uart_startup(struct uart_port *port)
return ret;
ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
KBUILD_MODNAME, priv);
priv->irq_name, priv);
if (ret < 0)
return ret;
@ -1588,13 +1590,8 @@ static void pch_uart_put_poll_char(struct uart_port *port,
wait_for_xmitr(priv, UART_LSR_THRE);
/*
* Send the character out.
* If a LF, also do CR...
*/
iowrite8(c, priv->membase + PCH_UART_THR);
if (c == 10) {
wait_for_xmitr(priv, UART_LSR_THRE);
iowrite8(13, priv->membase + PCH_UART_THR);
}
/*
* Finally, wait for transmitter to become empty
@ -1818,6 +1815,10 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
priv->port.line = board->line_no;
priv->trigger = PCH_UART_HAL_TRIGGER_M;
snprintf(priv->irq_name, IRQ_NAME_SIZE,
KBUILD_MODNAME ":" PCH_UART_DRIVER_DEVICE "%d",
priv->port.line);
spin_lock_init(&priv->port.lock);
pci_set_drvdata(pdev, priv);

5
drivers/tty/serial/pxa.c
View File

@ -711,13 +711,8 @@ static void serial_pxa_put_poll_char(struct uart_port *port,
wait_for_xmitr(up);
/*
* Send the character out.
* If a LF, also do CR...
*/
serial_out(up, UART_TX, c);
if (c == 10) {
wait_for_xmitr(up);
serial_out(up, UART_TX, 13);
}
/*
* Finally, wait for transmitter to become empty

1280
drivers/tty/serial/sc16is7xx.c Normal file
View File

File diff suppressed because it is too large Load Diff

3
drivers/tty/serial/serial_core.c
View File

@ -2239,6 +2239,9 @@ static void uart_poll_put_char(struct tty_driver *driver, int line, char ch)
return;
port = state->uart_port;
if (ch == '\n')
port->ops->poll_put_char(port, '\r');
port->ops->poll_put_char(port, ch);
}
#endif

5
drivers/tty/serial/serial_txx9.c
View File

@ -535,13 +535,8 @@ static void serial_txx9_put_poll_char(struct uart_port *port, unsigned char c)
wait_for_xmitr(up);
/*
* Send the character out.
* If a LF, also do CR...
*/
sio_out(up, TXX9_SITFIFO, c);
if (c == 10) {
wait_for_xmitr(up);
sio_out(up, TXX9_SITFIFO, 13);
}
/*
* Finally, wait for transmitter to become empty

1125
drivers/tty/serial/xilinx_uartps.c
View File

File diff suppressed because it is too large Load Diff

16
include/linux/serial_core.h
View File

@ -285,6 +285,22 @@ static inline int uart_poll_timeout(struct uart_port *port)
/*
* Console helpers.
*/
struct earlycon_device {
struct console *con;
struct uart_port port;
char options[16]; /* e.g., 115200n8 */
unsigned int baud;
};
int setup_earlycon(char *buf, const char *match,
int (*setup)(struct earlycon_device *, const char *));
#define EARLYCON_DECLARE(name, func) \
static int __init name ## _setup_earlycon(char *buf) \
{ \
return setup_earlycon(buf, __stringify(name), func); \
} \
early_param("earlycon", name ## _setup_earlycon);
struct uart_port *uart_get_console(struct uart_port *ports, int nr,
struct console *c);
void uart_parse_options(char *options, int *baud, int *parity, int *bits,

5
include/linux/tty_ldisc.h
View File

@ -92,7 +92,10 @@
* This function is called by the low-level tty driver to signal
* that line discpline should try to send more characters to the
* low-level driver for transmission. If the line discpline does
* not have any more data to send, it can just return.
* not have any more data to send, it can just return. If the line
* discipline does have some data to send, please arise a tasklet
* or workqueue to do the real data transfer. Do not send data in
* this hook, it may leads to a deadlock.
*
* int (*hangup)(struct tty_struct *)
*

8
include/uapi/linux/serial_core.h
View File

@ -211,7 +211,7 @@
/* VIA VT8500 SoC */
#define PORT_VT8500 97
/* Xilinx PSS UART */
/* Cadence (Xilinx Zynq) UART */
#define PORT_XUARTPS 98
/* Atheros AR933X SoC */
@ -238,4 +238,10 @@
/* Tilera TILE-Gx UART */
#define PORT_TILEGX 106
/* MEN 16z135 UART */
#define PORT_MEN_Z135 107
/* SC16IS74xx */
#define PORT_SC16IS7XX 108
#endif /* _UAPILINUX_SERIAL_CORE_H */

2
include/uapi/linux/serial_reg.h
View File

@ -32,7 +32,7 @@
#define UART_IIR 2 /* In: Interrupt ID Register */
#define UART_IIR_NO_INT 0x01 /* No interrupts pending */
#define UART_IIR_ID 0x06 /* Mask for the interrupt ID */
#define UART_IIR_ID 0x0e /* Mask for the interrupt ID */
#define UART_IIR_MSI 0x00 /* Modem status interrupt */
#define UART_IIR_THRI 0x02 /* Transmitter holding register empty */
#define UART_IIR_RDI 0x04 /* Receiver data interrupt */