diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250.c | 98 |
1 files changed, 87 insertions, 11 deletions
diff --git a/drivers/tty/serial/8250/8250.c b/drivers/tty/serial/8250/8250.c index 3ba4234592bc..d085e3a8ec06 100644 --- a/drivers/tty/serial/8250/8250.c +++ b/drivers/tty/serial/8250/8250.c @@ -280,7 +280,17 @@ static const struct serial8250_config uart_config[] = { .fifo_size = 64, .tx_loadsz = 64, .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, - .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR, + .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR | + UART_CAP_SLEEP, + }, + [PORT_XR17V35X] = { + .name = "XR17V35X", + .fifo_size = 256, + .tx_loadsz = 256, + .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11 | + UART_FCR_T_TRIG_11, + .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR | + UART_CAP_SLEEP, }, [PORT_LPC3220] = { .name = "LPC3220", @@ -455,6 +465,7 @@ static void io_serial_out(struct uart_port *p, int offset, int value) } static int serial8250_default_handle_irq(struct uart_port *port); +static int exar_handle_irq(struct uart_port *port); static void set_io_from_upio(struct uart_port *p) { @@ -574,6 +585,19 @@ EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos); */ static void serial8250_set_sleep(struct uart_8250_port *p, int sleep) { + /* + * Exar UARTs have a SLEEP register that enables or disables + * each UART to enter sleep mode separately. On the XR17V35x the + * register is accessible to each UART at the UART_EXAR_SLEEP + * offset but the UART channel may only write to the corresponding + * bit. + */ + if ((p->port.type == PORT_XR17V35X) || + (p->port.type == PORT_XR17D15X)) { + serial_out(p, UART_EXAR_SLEEP, 0xff); + return; + } + if (p->capabilities & UART_CAP_SLEEP) { if (p->capabilities & UART_CAP_EFR) { serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); @@ -882,6 +906,27 @@ static void autoconfig_16550a(struct uart_8250_port *up) up->capabilities |= UART_CAP_FIFO; /* + * XR17V35x UARTs have an extra divisor register, DLD + * that gets enabled with when DLAB is set which will + * cause the device to incorrectly match and assign + * port type to PORT_16650. The EFR for this UART is + * found at offset 0x09. Instead check the Deice ID (DVID) + * register for a 2, 4 or 8 port UART. + */ + if (up->port.flags & UPF_EXAR_EFR) { + status1 = serial_in(up, UART_EXAR_DVID); + if (status1 == 0x82 || status1 == 0x84 || status1 == 0x88) { + DEBUG_AUTOCONF("Exar XR17V35x "); + up->port.type = PORT_XR17V35X; + up->capabilities |= UART_CAP_AFE | UART_CAP_EFR | + UART_CAP_SLEEP; + + return; + } + + } + + /* * Check for presence of the EFR when DLAB is set. * Only ST16C650V1 UARTs pass this test. */ @@ -1013,8 +1058,12 @@ static void autoconfig_16550a(struct uart_8250_port *up) * Exar uarts have EFR in a weird location */ if (up->port.flags & UPF_EXAR_EFR) { + DEBUG_AUTOCONF("Exar XR17D15x "); up->port.type = PORT_XR17D15X; - up->capabilities |= UART_CAP_AFE | UART_CAP_EFR; + up->capabilities |= UART_CAP_AFE | UART_CAP_EFR | + UART_CAP_SLEEP; + + return; } /* @@ -1516,6 +1565,31 @@ static int serial8250_default_handle_irq(struct uart_port *port) } /* + * These Exar UARTs have an extra interrupt indicator that could + * fire for a few unimplemented interrupts. One of which is a + * wakeup event when coming out of sleep. Put this here just + * to be on the safe side that these interrupts don't go unhandled. + */ +static int exar_handle_irq(struct uart_port *port) +{ + unsigned char int0, int1, int2, int3; + unsigned int iir = serial_port_in(port, UART_IIR); + int ret; + + ret = serial8250_handle_irq(port, iir); + + if ((port->type == PORT_XR17V35X) || + (port->type == PORT_XR17D15X)) { + int0 = serial_port_in(port, 0x80); + int1 = serial_port_in(port, 0x81); + int2 = serial_port_in(port, 0x82); + int3 = serial_port_in(port, 0x83); + } + + return ret; +} + +/* * This is the serial driver's interrupt routine. * * Arjan thinks the old way was overly complex, so it got simplified. @@ -2349,16 +2423,14 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, serial_port_out(port, UART_EFR, efr); } -#ifdef CONFIG_ARCH_OMAP1 /* Workaround to enable 115200 baud on OMAP1510 internal ports */ - if (cpu_is_omap1510() && is_omap_port(up)) { + if (is_omap1510_8250(up)) { if (baud == 115200) { quot = 1; serial_port_out(port, UART_OMAP_OSC_12M_SEL, 1); } else serial_port_out(port, UART_OMAP_OSC_12M_SEL, 0); } -#endif /* * For NatSemi, switch to bank 2 not bank 1, to avoid resetting EXCR2, @@ -2439,10 +2511,9 @@ static unsigned int serial8250_port_size(struct uart_8250_port *pt) { if (pt->port.iotype == UPIO_AU) return 0x1000; -#ifdef CONFIG_ARCH_OMAP1 - if (is_omap_port(pt)) + if (is_omap1_8250(pt)) return 0x16 << pt->port.regshift; -#endif + return 8 << pt->port.regshift; } @@ -2617,6 +2688,11 @@ static void serial8250_config_port(struct uart_port *port, int flags) serial8250_release_rsa_resource(up); if (port->type == PORT_UNKNOWN) serial8250_release_std_resource(up); + + /* Fixme: probably not the best place for this */ + if ((port->type == PORT_XR17V35X) || + (port->type == PORT_XR17D15X)) + port->handle_irq = exar_handle_irq; } static int @@ -2992,7 +3068,7 @@ void serial8250_resume_port(int line) * list is terminated with a zero flags entry, which means we expect * all entries to have at least UPF_BOOT_AUTOCONF set. */ -static int __devinit serial8250_probe(struct platform_device *dev) +static int serial8250_probe(struct platform_device *dev) { struct plat_serial8250_port *p = dev->dev.platform_data; struct uart_8250_port uart; @@ -3038,7 +3114,7 @@ static int __devinit serial8250_probe(struct platform_device *dev) /* * Remove serial ports registered against a platform device. */ -static int __devexit serial8250_remove(struct platform_device *dev) +static int serial8250_remove(struct platform_device *dev) { int i; @@ -3081,7 +3157,7 @@ static int serial8250_resume(struct platform_device *dev) static struct platform_driver serial8250_isa_driver = { .probe = serial8250_probe, - .remove = __devexit_p(serial8250_remove), + .remove = serial8250_remove, .suspend = serial8250_suspend, .resume = serial8250_resume, .driver = { |