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path: root/drivers/serial/8250.c
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Diffstat (limited to 'drivers/serial/8250.c')
-rw-r--r--drivers/serial/8250.c115
1 files changed, 80 insertions, 35 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 09ef57034c9c..167c4a6ccbc3 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -31,6 +31,7 @@
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/tty.h>
+#include <linux/ratelimit.h>
#include <linux/tty_flip.h>
#include <linux/serial_reg.h>
#include <linux/serial_core.h>
@@ -154,12 +155,6 @@ struct uart_8250_port {
unsigned char lsr_saved_flags;
#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
unsigned char msr_saved_flags;
-
- /*
- * We provide a per-port pm hook.
- */
- void (*pm)(struct uart_port *port,
- unsigned int state, unsigned int old);
};
struct irq_info {
@@ -241,7 +236,7 @@ static const struct serial8250_config uart_config[] = {
.fifo_size = 128,
.tx_loadsz = 128,
.fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO,
+ .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
},
[PORT_16654] = {
.name = "ST16654",
@@ -300,6 +295,13 @@ static const struct serial8250_config uart_config[] = {
.fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00,
.flags = UART_CAP_FIFO | UART_CAP_AFE,
},
+ [PORT_U6_16550A] = {
+ .name = "U6_16550A",
+ .fifo_size = 64,
+ .tx_loadsz = 64,
+ .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+ .flags = UART_CAP_FIFO | UART_CAP_AFE,
+ },
};
#if defined(CONFIG_MIPS_ALCHEMY)
@@ -1070,6 +1072,15 @@ static void autoconfig_16550a(struct uart_8250_port *up)
DEBUG_AUTOCONF("Couldn't force IER_UUE to 0 ");
}
serial_outp(up, UART_IER, iersave);
+
+ /*
+ * We distinguish between 16550A and U6 16550A by counting
+ * how many bytes are in the FIFO.
+ */
+ if (up->port.type == PORT_16550A && size_fifo(up) == 64) {
+ up->port.type = PORT_U6_16550A;
+ up->capabilities |= UART_CAP_AFE;
+ }
}
/*
@@ -1590,8 +1601,8 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
if (l == i->head && pass_counter++ > PASS_LIMIT) {
/* If we hit this, we're dead. */
- printk(KERN_ERR "serial8250: too much work for "
- "irq%d\n", irq);
+ printk_ratelimited(KERN_ERR
+ "serial8250: too much work for irq%d\n", irq);
break;
}
} while (l != end);
@@ -1706,12 +1717,6 @@ static void serial_unlink_irq_chain(struct uart_8250_port *up)
mutex_unlock(&hash_mutex);
}
-/* Base timer interval for polling */
-static inline int poll_timeout(int timeout)
-{
- return timeout > 6 ? (timeout / 2 - 2) : 1;
-}
-
/*
* This function is used to handle ports that do not have an
* interrupt. This doesn't work very well for 16450's, but gives
@@ -1726,7 +1731,7 @@ static void serial8250_timeout(unsigned long data)
iir = serial_in(up, UART_IIR);
if (!(iir & UART_IIR_NO_INT))
serial8250_handle_port(up);
- mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout));
+ mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
}
static void serial8250_backup_timeout(unsigned long data)
@@ -1771,7 +1776,7 @@ static void serial8250_backup_timeout(unsigned long data)
/* Standard timer interval plus 0.2s to keep the port running */
mod_timer(&up->timer,
- jiffies + poll_timeout(up->port.timeout) + HZ / 5);
+ jiffies + uart_poll_timeout(&up->port) + HZ / 5);
}
static unsigned int serial8250_tx_empty(struct uart_port *port)
@@ -1851,15 +1856,17 @@ static void wait_for_xmitr(struct uart_8250_port *up, int bits)
unsigned int status, tmout = 10000;
/* Wait up to 10ms for the character(s) to be sent. */
- do {
+ for (;;) {
status = serial_in(up, UART_LSR);
up->lsr_saved_flags |= status & LSR_SAVE_FLAGS;
+ if ((status & bits) == bits)
+ break;
if (--tmout == 0)
break;
udelay(1);
- } while ((status & bits) != bits);
+ }
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
@@ -2053,7 +2060,7 @@ static int serial8250_startup(struct uart_port *port)
up->timer.function = serial8250_backup_timeout;
up->timer.data = (unsigned long)up;
mod_timer(&up->timer, jiffies +
- poll_timeout(up->port.timeout) + HZ / 5);
+ uart_poll_timeout(port) + HZ / 5);
}
/*
@@ -2063,7 +2070,7 @@ static int serial8250_startup(struct uart_port *port)
*/
if (!is_real_interrupt(up->port.irq)) {
up->timer.data = (unsigned long)up;
- mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout));
+ mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
} else {
retval = serial_link_irq_chain(up);
if (retval)
@@ -2224,9 +2231,9 @@ static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int
return quot;
}
-static void
-serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
+void
+serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
+ struct ktermios *old)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
unsigned char cval, fcr = 0;
@@ -2402,32 +2409,46 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
if (tty_termios_baud_rate(termios))
tty_termios_encode_baud_rate(termios, baud, baud);
}
+EXPORT_SYMBOL(serial8250_do_set_termios);
static void
-serial8250_set_ldisc(struct uart_port *port)
+serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
+ struct ktermios *old)
{
- int line = port->line;
-
- if (line >= port->state->port.tty->driver->num)
- return;
+ if (port->set_termios)
+ port->set_termios(port, termios, old);
+ else
+ serial8250_do_set_termios(port, termios, old);
+}
- if (port->state->port.tty->ldisc->ops->num == N_PPS) {
+static void
+serial8250_set_ldisc(struct uart_port *port, int new)
+{
+ if (new == N_PPS) {
port->flags |= UPF_HARDPPS_CD;
serial8250_enable_ms(port);
} else
port->flags &= ~UPF_HARDPPS_CD;
}
-static void
-serial8250_pm(struct uart_port *port, unsigned int state,
- unsigned int oldstate)
+
+void serial8250_do_pm(struct uart_port *port, unsigned int state,
+ unsigned int oldstate)
{
struct uart_8250_port *p = (struct uart_8250_port *)port;
serial8250_set_sleep(p, state != 0);
+}
+EXPORT_SYMBOL(serial8250_do_pm);
- if (p->pm)
- p->pm(port, state, oldstate);
+static void
+serial8250_pm(struct uart_port *port, unsigned int state,
+ unsigned int oldstate)
+{
+ if (port->pm)
+ port->pm(port, state, oldstate);
+ else
+ serial8250_do_pm(port, state, oldstate);
}
static unsigned int serial8250_port_size(struct uart_8250_port *pt)
@@ -2652,6 +2673,16 @@ static struct uart_ops serial8250_pops = {
static struct uart_8250_port serial8250_ports[UART_NR];
+static void (*serial8250_isa_config)(int port, struct uart_port *up,
+ unsigned short *capabilities);
+
+void serial8250_set_isa_configurator(
+ void (*v)(int port, struct uart_port *up, unsigned short *capabilities))
+{
+ serial8250_isa_config = v;
+}
+EXPORT_SYMBOL(serial8250_set_isa_configurator);
+
static void __init serial8250_isa_init_ports(void)
{
struct uart_8250_port *up;
@@ -2697,6 +2728,9 @@ static void __init serial8250_isa_init_ports(void)
up->port.regshift = old_serial_port[i].iomem_reg_shift;
set_io_from_upio(&up->port);
up->port.irqflags |= irqflag;
+ if (serial8250_isa_config != NULL)
+ serial8250_isa_config(i, &up->port, &up->capabilities);
+
}
}
@@ -2987,6 +3021,8 @@ static int __devinit serial8250_probe(struct platform_device *dev)
port.type = p->type;
port.serial_in = p->serial_in;
port.serial_out = p->serial_out;
+ port.set_termios = p->set_termios;
+ port.pm = p->pm;
port.dev = &dev->dev;
port.irqflags |= irqflag;
ret = serial8250_register_port(&port);
@@ -3150,6 +3186,15 @@ int serial8250_register_port(struct uart_port *port)
uart->port.serial_in = port->serial_in;
if (port->serial_out)
uart->port.serial_out = port->serial_out;
+ /* Possibly override set_termios call */
+ if (port->set_termios)
+ uart->port.set_termios = port->set_termios;
+ if (port->pm)
+ uart->port.pm = port->pm;
+
+ if (serial8250_isa_config != NULL)
+ serial8250_isa_config(0, &uart->port,
+ &uart->capabilities);
ret = uart_add_one_port(&serial8250_reg, &uart->port);
if (ret == 0)
generated by cgit v1.2.3 (git 2.0.4) at 2025-05-14 22:11:12 +0000