From f5ee56cc184e0944ebc9ff1691985219959596f6 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Fri, 9 Sep 2005 13:01:32 -0700 Subject: [PATCH] [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 Signed-off-by: Atsushi Nemoto Acked-by: Russell King Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/serial/serial_txx9.c | 118 +++++++++++++++++++++++++++-------- 1 file changed, 91 insertions(+), 27 deletions(-) diff --git a/drivers/serial/serial_txx9.c b/drivers/serial/serial_txx9.c index 49afadbe461b..f10c86d60b64 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 @@ -54,7 +56,7 @@ #include #include -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; }