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path: root/drivers/tty/serial/8250/8250.c
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Diffstat (limited to 'drivers/tty/serial/8250/8250.c')
-rw-r--r--drivers/tty/serial/8250/8250.c312
1 files changed, 150 insertions, 162 deletions
diff --git a/drivers/tty/serial/8250/8250.c b/drivers/tty/serial/8250/8250.c
index 5c27f7e6c9f1..47d061b9ad4d 100644
--- a/drivers/tty/serial/8250/8250.c
+++ b/drivers/tty/serial/8250/8250.c
@@ -284,7 +284,20 @@ static const struct serial8250_config uart_config[] = {
},
};
-#if defined(CONFIG_MIPS_ALCHEMY)
+/* Uart divisor latch read */
+static int default_serial_dl_read(struct uart_8250_port *up)
+{
+ return serial_in(up, UART_DLL) | serial_in(up, UART_DLM) << 8;
+}
+
+/* Uart divisor latch write */
+static void default_serial_dl_write(struct uart_8250_port *up, int value)
+{
+ serial_out(up, UART_DLL, value & 0xff);
+ serial_out(up, UART_DLM, value >> 8 & 0xff);
+}
+
+#ifdef CONFIG_MIPS_ALCHEMY
/* Au1x00 UART hardware has a weird register layout */
static const u8 au_io_in_map[] = {
@@ -305,22 +318,32 @@ static const u8 au_io_out_map[] = {
[UART_MCR] = 6,
};
-/* sane hardware needs no mapping */
-static inline int map_8250_in_reg(struct uart_port *p, int offset)
+static unsigned int au_serial_in(struct uart_port *p, int offset)
+{
+ offset = au_io_in_map[offset] << p->regshift;
+ return __raw_readl(p->membase + offset);
+}
+
+static void au_serial_out(struct uart_port *p, int offset, int value)
+{
+ offset = au_io_out_map[offset] << p->regshift;
+ __raw_writel(value, p->membase + offset);
+}
+
+/* Au1x00 haven't got a standard divisor latch */
+static int au_serial_dl_read(struct uart_8250_port *up)
{
- if (p->iotype != UPIO_AU)
- return offset;
- return au_io_in_map[offset];
+ return __raw_readl(up->port.membase + 0x28);
}
-static inline int map_8250_out_reg(struct uart_port *p, int offset)
+static void au_serial_dl_write(struct uart_8250_port *up, int value)
{
- if (p->iotype != UPIO_AU)
- return offset;
- return au_io_out_map[offset];
+ __raw_writel(value, up->port.membase + 0x28);
}
-#elif defined(CONFIG_SERIAL_8250_RM9K)
+#endif
+
+#ifdef CONFIG_SERIAL_8250_RM9K
static const u8
regmap_in[8] = {
@@ -344,87 +367,79 @@ static const u8
[UART_SCR] = 0x2c
};
-static inline int map_8250_in_reg(struct uart_port *p, int offset)
+static unsigned int rm9k_serial_in(struct uart_port *p, int offset)
{
- if (p->iotype != UPIO_RM9000)
- return offset;
- return regmap_in[offset];
+ offset = regmap_in[offset] << p->regshift;
+ return readl(p->membase + offset);
}
-static inline int map_8250_out_reg(struct uart_port *p, int offset)
+static void rm9k_serial_out(struct uart_port *p, int offset, int value)
{
- if (p->iotype != UPIO_RM9000)
- return offset;
- return regmap_out[offset];
+ offset = regmap_out[offset] << p->regshift;
+ writel(value, p->membase + offset);
}
-#else
+static int rm9k_serial_dl_read(struct uart_8250_port *up)
+{
+ return ((__raw_readl(up->port.membase + 0x10) << 8) |
+ (__raw_readl(up->port.membase + 0x08) & 0xff)) & 0xffff;
+}
-/* sane hardware needs no mapping */
-#define map_8250_in_reg(up, offset) (offset)
-#define map_8250_out_reg(up, offset) (offset)
+static void rm9k_serial_dl_write(struct uart_8250_port *up, int value)
+{
+ __raw_writel(value, up->port.membase + 0x08);
+ __raw_writel(value >> 8, up->port.membase + 0x10);
+}
#endif
static unsigned int hub6_serial_in(struct uart_port *p, int offset)
{
- offset = map_8250_in_reg(p, offset) << p->regshift;
+ offset = offset << p->regshift;
outb(p->hub6 - 1 + offset, p->iobase);
return inb(p->iobase + 1);
}
static void hub6_serial_out(struct uart_port *p, int offset, int value)
{
- offset = map_8250_out_reg(p, offset) << p->regshift;
+ offset = offset << p->regshift;
outb(p->hub6 - 1 + offset, p->iobase);
outb(value, p->iobase + 1);
}
static unsigned int mem_serial_in(struct uart_port *p, int offset)
{
- offset = map_8250_in_reg(p, offset) << p->regshift;
+ offset = offset << p->regshift;
return readb(p->membase + offset);
}
static void mem_serial_out(struct uart_port *p, int offset, int value)
{
- offset = map_8250_out_reg(p, offset) << p->regshift;
+ offset = offset << p->regshift;
writeb(value, p->membase + offset);
}
static void mem32_serial_out(struct uart_port *p, int offset, int value)
{
- offset = map_8250_out_reg(p, offset) << p->regshift;
+ offset = offset << p->regshift;
writel(value, p->membase + offset);
}
static unsigned int mem32_serial_in(struct uart_port *p, int offset)
{
- offset = map_8250_in_reg(p, offset) << p->regshift;
+ offset = offset << p->regshift;
return readl(p->membase + offset);
}
-static unsigned int au_serial_in(struct uart_port *p, int offset)
-{
- offset = map_8250_in_reg(p, offset) << p->regshift;
- return __raw_readl(p->membase + offset);
-}
-
-static void au_serial_out(struct uart_port *p, int offset, int value)
-{
- offset = map_8250_out_reg(p, offset) << p->regshift;
- __raw_writel(value, p->membase + offset);
-}
-
static unsigned int io_serial_in(struct uart_port *p, int offset)
{
- offset = map_8250_in_reg(p, offset) << p->regshift;
+ offset = offset << p->regshift;
return inb(p->iobase + offset);
}
static void io_serial_out(struct uart_port *p, int offset, int value)
{
- offset = map_8250_out_reg(p, offset) << p->regshift;
+ offset = offset << p->regshift;
outb(value, p->iobase + offset);
}
@@ -434,6 +449,10 @@ static void set_io_from_upio(struct uart_port *p)
{
struct uart_8250_port *up =
container_of(p, struct uart_8250_port, port);
+
+ up->dl_read = default_serial_dl_read;
+ up->dl_write = default_serial_dl_write;
+
switch (p->iotype) {
case UPIO_HUB6:
p->serial_in = hub6_serial_in;
@@ -445,16 +464,28 @@ static void set_io_from_upio(struct uart_port *p)
p->serial_out = mem_serial_out;
break;
- case UPIO_RM9000:
case UPIO_MEM32:
p->serial_in = mem32_serial_in;
p->serial_out = mem32_serial_out;
break;
+#ifdef CONFIG_SERIAL_8250_RM9K
+ case UPIO_RM9000:
+ p->serial_in = rm9k_serial_in;
+ p->serial_out = rm9k_serial_out;
+ up->dl_read = rm9k_serial_dl_read;
+ up->dl_write = rm9k_serial_dl_write;
+ break;
+#endif
+
+#ifdef CONFIG_MIPS_ALCHEMY
case UPIO_AU:
p->serial_in = au_serial_in;
p->serial_out = au_serial_out;
+ up->dl_read = au_serial_dl_read;
+ up->dl_write = au_serial_dl_write;
break;
+#endif
default:
p->serial_in = io_serial_in;
@@ -481,59 +512,6 @@ serial_port_out_sync(struct uart_port *p, int offset, int value)
}
}
-/* Uart divisor latch read */
-static inline int _serial_dl_read(struct uart_8250_port *up)
-{
- return serial_in(up, UART_DLL) | serial_in(up, UART_DLM) << 8;
-}
-
-/* Uart divisor latch write */
-static inline void _serial_dl_write(struct uart_8250_port *up, int value)
-{
- serial_out(up, UART_DLL, value & 0xff);
- serial_out(up, UART_DLM, value >> 8 & 0xff);
-}
-
-#if defined(CONFIG_MIPS_ALCHEMY)
-/* Au1x00 haven't got a standard divisor latch */
-static int serial_dl_read(struct uart_8250_port *up)
-{
- if (up->port.iotype == UPIO_AU)
- return __raw_readl(up->port.membase + 0x28);
- else
- return _serial_dl_read(up);
-}
-
-static void serial_dl_write(struct uart_8250_port *up, 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 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)
-#endif
-
/*
* For the 16C950
*/
@@ -568,6 +546,16 @@ static void serial8250_clear_fifos(struct uart_8250_port *p)
}
}
+void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p)
+{
+ unsigned char fcr;
+
+ serial8250_clear_fifos(p);
+ fcr = uart_config[p->port.type].fcr;
+ serial_out(p, UART_FCR, fcr);
+}
+EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos);
+
/*
* IER sleep support. UARTs which have EFRs need the "extended
* capability" bit enabled. Note that on XR16C850s, we need to
@@ -1332,27 +1320,6 @@ static void serial8250_enable_ms(struct uart_port *port)
}
/*
- * Clear the Tegra rx fifo after a break
- *
- * FIXME: This needs to become a port specific callback once we have a
- * framework for this
- */
-static void clear_rx_fifo(struct uart_8250_port *up)
-{
- unsigned int status, tmout = 10000;
- do {
- status = serial_in(up, UART_LSR);
- if (status & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS))
- status = serial_in(up, UART_RX);
- else
- break;
- if (--tmout == 0)
- break;
- udelay(1);
- } while (1);
-}
-
-/*
* serial8250_rx_chars: processes according to the passed in LSR
* value, and returns the remaining LSR bits not handled
* by this Rx routine.
@@ -1386,20 +1353,10 @@ serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr)
up->lsr_saved_flags = 0;
if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
- /*
- * For statistics only
- */
if (lsr & UART_LSR_BI) {
lsr &= ~(UART_LSR_FE | UART_LSR_PE);
port->icount.brk++;
/*
- * If tegra port then clear the rx fifo to
- * accept another break/character.
- */
- if (port->type == PORT_TEGRA)
- clear_rx_fifo(up);
-
- /*
* We do the SysRQ and SAK checking
* here because otherwise the break
* may get masked by ignore_status_mask
@@ -2280,10 +2237,11 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
quot++;
if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) {
- if (baud < 2400)
- fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
- else
- fcr = uart_config[port->type].fcr;
+ fcr = uart_config[port->type].fcr;
+ if (baud < 2400) {
+ fcr &= ~UART_FCR_TRIGGER_MASK;
+ fcr |= UART_FCR_TRIGGER_1;
+ }
}
/*
@@ -3037,6 +2995,7 @@ static int __devinit serial8250_probe(struct platform_device *dev)
port.serial_in = p->serial_in;
port.serial_out = p->serial_out;
port.handle_irq = p->handle_irq;
+ port.handle_break = p->handle_break;
port.set_termios = p->set_termios;
port.pm = p->pm;
port.dev = &dev->dev;
@@ -3153,7 +3112,7 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
}
/**
- * serial8250_register_port - register a serial port
+ * serial8250_register_8250_port - register a serial port
* @port: serial port template
*
* Configure the serial port specified by the request. If the
@@ -3165,50 +3124,56 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
*
* On success the port is ready to use and the line number is returned.
*/
-int serial8250_register_port(struct uart_port *port)
+int serial8250_register_8250_port(struct uart_8250_port *up)
{
struct uart_8250_port *uart;
int ret = -ENOSPC;
- if (port->uartclk == 0)
+ if (up->port.uartclk == 0)
return -EINVAL;
mutex_lock(&serial_mutex);
- uart = serial8250_find_match_or_unused(port);
+ uart = serial8250_find_match_or_unused(&up->port);
if (uart) {
uart_remove_one_port(&serial8250_reg, &uart->port);
- uart->port.iobase = port->iobase;
- uart->port.membase = port->membase;
- uart->port.irq = port->irq;
- uart->port.irqflags = port->irqflags;
- uart->port.uartclk = port->uartclk;
- uart->port.fifosize = port->fifosize;
- uart->port.regshift = port->regshift;
- uart->port.iotype = port->iotype;
- uart->port.flags = port->flags | UPF_BOOT_AUTOCONF;
- uart->port.mapbase = port->mapbase;
- uart->port.private_data = port->private_data;
- if (port->dev)
- uart->port.dev = port->dev;
-
- if (port->flags & UPF_FIXED_TYPE)
- serial8250_init_fixed_type_port(uart, port->type);
+ uart->port.iobase = up->port.iobase;
+ uart->port.membase = up->port.membase;
+ uart->port.irq = up->port.irq;
+ uart->port.irqflags = up->port.irqflags;
+ uart->port.uartclk = up->port.uartclk;
+ uart->port.fifosize = up->port.fifosize;
+ uart->port.regshift = up->port.regshift;
+ uart->port.iotype = up->port.iotype;
+ uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF;
+ uart->port.mapbase = up->port.mapbase;
+ uart->port.private_data = up->port.private_data;
+ if (up->port.dev)
+ uart->port.dev = up->port.dev;
+
+ if (up->port.flags & UPF_FIXED_TYPE)
+ serial8250_init_fixed_type_port(uart, up->port.type);
set_io_from_upio(&uart->port);
/* Possibly override default I/O functions. */
- if (port->serial_in)
- uart->port.serial_in = port->serial_in;
- if (port->serial_out)
- uart->port.serial_out = port->serial_out;
- if (port->handle_irq)
- uart->port.handle_irq = port->handle_irq;
+ if (up->port.serial_in)
+ uart->port.serial_in = up->port.serial_in;
+ if (up->port.serial_out)
+ uart->port.serial_out = up->port.serial_out;
+ if (up->port.handle_irq)
+ uart->port.handle_irq = up->port.handle_irq;
/* 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 (up->port.set_termios)
+ uart->port.set_termios = up->port.set_termios;
+ if (up->port.pm)
+ uart->port.pm = up->port.pm;
+ if (up->port.handle_break)
+ uart->port.handle_break = up->port.handle_break;
+ if (up->dl_read)
+ uart->dl_read = up->dl_read;
+ if (up->dl_write)
+ uart->dl_write = up->dl_write;
if (serial8250_isa_config != NULL)
serial8250_isa_config(0, &uart->port,
@@ -3222,6 +3187,29 @@ int serial8250_register_port(struct uart_port *port)
return ret;
}
+EXPORT_SYMBOL(serial8250_register_8250_port);
+
+/**
+ * serial8250_register_port - register a serial port
+ * @port: serial port template
+ *
+ * Configure the serial port specified by the request. If the
+ * port exists and is in use, it is hung up and unregistered
+ * first.
+ *
+ * The port is then probed and if necessary the IRQ is autodetected
+ * If this fails an error is returned.
+ *
+ * On success the port is ready to use and the line number is returned.
+ */
+int serial8250_register_port(struct uart_port *port)
+{
+ struct uart_8250_port up;
+
+ memset(&up, 0, sizeof(up));
+ memcpy(&up.port, port, sizeof(*port));
+ return serial8250_register_8250_port(&up);
+}
EXPORT_SYMBOL(serial8250_register_port);
/**