[PATCH] txx9 serial update

Support for the new RBHMA4500 eval board for the TX4938.  General update
from the 8250 ancestor of this driver.  Replace use of deprecated
interfaces.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 91 insertions, 27 deletions

diff --git a/drivers/serial/serial_txx9.c b/drivers/serial/serial_txx9.c
index 49afadbe461..f10c86d60b6 100644
--- a/drivers/serial/serial_txx9.c
+++ b/drivers/serial/serial_txx9.c
@@ -31,6 +31,8 @@
  *      1.01    Set fifosize to make tx_empry called properly.
  *              Use standard uart_get_divisor.
  *      1.02    Cleanup. (import 8250.c changes)
+ *      1.03    Fix low-latency mode. (import 8250.c changes)
+ *      1.04    Remove usage of deprecated functions, cleanup.
  */
 #include <linux/config.h>
 
@@ -54,7 +56,7 @@
 #include <asm/io.h>
 #include <asm/irq.h>
 
-static char *serial_version = "1.02";
+static char *serial_version = "1.04";
 static char *serial_name = "TX39/49 Serial driver";
 
 #define PASS_LIMIT      256
@@ -86,9 +88,9 @@ static char *serial_name = "TX39/49 Serial driver";
  */
 #ifdef ENABLE_SERIAL_TXX9_PCI
 #define NR_PCI_BOARDS   4
-#define UART_NR  (2 + NR_PCI_BOARDS)
+#define UART_NR  (4 + NR_PCI_BOARDS)
 #else
-#define UART_NR  2
+#define UART_NR  4
 #endif
 
 struct uart_txx9_port {
@@ -304,8 +306,11 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status, struct pt_regs *r
                 /* The following is not allowed by the tty layer and
                    unsafe. It should be fixed ASAP */
                 if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
-                        if(tty->low_latency)
+                        if (tty->low_latency) {
+                                spin_unlock(&up->port.lock);
                                 tty_flip_buffer_push(tty);
+                                spin_lock(&up->port.lock);
+                        }
                         /* If this failed then we will throw away the
                            bytes but must do so to clear interrupts */
                 }
@@ -356,7 +361,9 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status, struct pt_regs *r
         ignore_char:
                 disr = sio_in(up, TXX9_SIDISR);
         } while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
+        spin_unlock(&up->port.lock);
         tty_flip_buffer_push(tty);
+        spin_lock(&up->port.lock);
         *status = disr;
 }
 
@@ -667,17 +674,8 @@ serial_txx9_pm(struct uart_port *port, unsigned int state,
               unsigned int oldstate)
 {
         struct uart_txx9_port *up = (struct uart_txx9_port *)port;
-        if (state) {
-                /* sleep */
-
-                if (up->pm)
-                        up->pm(port, state, oldstate);
-        } else {
-                /* wake */
-
-                if (up->pm)
-                        up->pm(port, state, oldstate);
-        }
+        if (up->pm)
+                up->pm(port, state, oldstate);
 }
 
 static int serial_txx9_request_resource(struct uart_txx9_port *up)
@@ -979,14 +977,6 @@ static int __init serial_txx9_console_init(void)
 }
 console_initcall(serial_txx9_console_init);
 
-static int __init serial_txx9_late_console_init(void)
-{
-        if (!(serial_txx9_console.flags & CON_ENABLED))
-                register_console(&serial_txx9_console);
-        return 0;
-}
-late_initcall(serial_txx9_late_console_init);
-
 #define SERIAL_TXX9_CONSOLE     &serial_txx9_console
 #else
 #define SERIAL_TXX9_CONSOLE     NULL
@@ -1039,6 +1029,73 @@ static void serial_txx9_resume_port(int line)
         uart_resume_port(&serial_txx9_reg, &serial_txx9_ports[line].port);
 }
 
+static DECLARE_MUTEX(serial_txx9_sem);
+
+/**
+ *      serial_txx9_register_port - register a serial port
+ *      @port: serial port template
+ *
+ *      Configure the serial port specified by the request.
+ *
+ *      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.
+ */
+static int __devinit serial_txx9_register_port(struct uart_port *port)
+{
+        int i;
+        struct uart_txx9_port *uart;
+        int ret = -ENOSPC;
+
+        down(&serial_txx9_sem);
+        for (i = 0; i < UART_NR; i++) {
+                uart = &serial_txx9_ports[i];
+                if (uart->port.type == PORT_UNKNOWN)
+                        break;
+        }
+        if (i < UART_NR) {
+                uart_remove_one_port(&serial_txx9_reg, &uart->port);
+                uart->port.iobase = port->iobase;
+                uart->port.membase = port->membase;
+                uart->port.irq      = port->irq;
+                uart->port.uartclk  = port->uartclk;
+                uart->port.iotype   = port->iotype;
+                uart->port.flags    = port->flags | UPF_BOOT_AUTOCONF;
+                uart->port.mapbase  = port->mapbase;
+                if (port->dev)
+                        uart->port.dev = port->dev;
+                ret = uart_add_one_port(&serial_txx9_reg, &uart->port);
+                if (ret == 0)
+                        ret = uart->port.line;
+        }
+        up(&serial_txx9_sem);
+        return ret;
+}
+
+/**
+ *      serial_txx9_unregister_port - remove a txx9 serial port at runtime
+ *      @line: serial line number
+ *
+ *      Remove one serial port.  This may not be called from interrupt
+ *      context.  We hand the port back to the our control.
+ */
+static void __devexit serial_txx9_unregister_port(int line)
+{
+        struct uart_txx9_port *uart = &serial_txx9_ports[line];
+
+        down(&serial_txx9_sem);
+        uart_remove_one_port(&serial_txx9_reg, &uart->port);
+        uart->port.flags = 0;
+        uart->port.type = PORT_UNKNOWN;
+        uart->port.iobase = 0;
+        uart->port.mapbase = 0;
+        uart->port.membase = 0;
+        uart->port.dev = NULL;
+        uart_add_one_port(&serial_txx9_reg, &uart->port);
+        up(&serial_txx9_sem);
+}
+
 /*
  * Probe one serial board.  Unfortunately, there is no rhyme nor reason
  * to the arrangement of serial ports on a PCI card.
@@ -1056,13 +1113,13 @@ pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
 
         memset(&port, 0, sizeof(port));
         port.ops = &serial_txx9_pops;
-        port.flags |= UPF_BOOT_AUTOCONF; /* uart_ops.config_port will be called */
         port.flags |= UPF_TXX9_HAVE_CTS_LINE;
         port.uartclk = 66670000;
         port.irq = dev->irq;
         port.iotype = UPIO_PORT;
         port.iobase = pci_resource_start(dev, 1);
-        line = uart_register_port(&serial_txx9_reg, &port);
+        port.dev = &dev->dev;
+        line = serial_txx9_register_port(&port);
         if (line < 0) {
                 printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), line);
         }
@@ -1078,7 +1135,7 @@ static void __devexit pciserial_txx9_remove_one(struct pci_dev *dev)
         pci_set_drvdata(dev, NULL);
 
         if (line) {
-                uart_unregister_port(&serial_txx9_reg, line);
+                serial_txx9_unregister_port(line);
                 pci_disable_device(dev);
         }
 }
@@ -1089,6 +1146,8 @@ static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
 
         if (line)
                 serial_txx9_suspend_port(line);
+        pci_save_state(dev);
+        pci_set_power_state(dev, pci_choose_state(dev, state));
         return 0;
 }
 
@@ -1096,8 +1155,13 @@ static int pciserial_txx9_resume_one(struct pci_dev *dev)
 {
         int line = (int)(long)pci_get_drvdata(dev);
 
-        if (line)
+        pci_set_power_state(dev, PCI_D0);
+        pci_restore_state(dev);
+
+        if (line) {
+                pci_enable_device(dev);
                 serial_txx9_resume_port(line);
+        }
         return 0;
 }