#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
+#include <linux/mca.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/tty.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
+#include <linux/nmi.h>
#include <asm/io.h>
#include <asm/irq.h>
* share_irqs - whether we pass SA_SHIRQ to request_irq(). This option
* is unsafe when used on edge-triggered interrupts.
*/
-unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
+static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
/*
* Debugging.
.fifo_size = 32,
.tx_loadsz = 32,
.fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
- .flags = UART_CAP_FIFO,
+ .flags = UART_CAP_FIFO | UART_CAP_UUE,
},
};
*/
static int size_fifo(struct uart_8250_port *up)
{
- unsigned char old_fcr, old_mcr, old_dll, old_dlm;
+ unsigned char old_fcr, old_mcr, old_dll, old_dlm, old_lcr;
int count;
+ old_lcr = serial_inp(up, UART_LCR);
+ serial_outp(up, UART_LCR, 0);
old_fcr = serial_inp(up, UART_FCR);
old_mcr = serial_inp(up, UART_MCR);
serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
serial_outp(up, UART_LCR, UART_LCR_DLAB);
serial_outp(up, UART_DLL, old_dll);
serial_outp(up, UART_DLM, old_dlm);
+ serial_outp(up, UART_LCR, old_lcr);
return count;
}
+/*
+ * Read UART ID using the divisor method - set DLL and DLM to zero
+ * and the revision will be in DLL and device type in DLM. We
+ * preserve the device state across this.
+ */
+static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
+{
+ unsigned char old_dll, old_dlm, old_lcr;
+ unsigned int id;
+
+ old_lcr = serial_inp(p, UART_LCR);
+ serial_outp(p, UART_LCR, UART_LCR_DLAB);
+
+ old_dll = serial_inp(p, UART_DLL);
+ old_dlm = serial_inp(p, UART_DLM);
+
+ serial_outp(p, UART_DLL, 0);
+ serial_outp(p, UART_DLM, 0);
+
+ id = serial_inp(p, UART_DLL) | serial_inp(p, UART_DLM) << 8;
+
+ serial_outp(p, UART_DLL, old_dll);
+ serial_outp(p, UART_DLM, old_dlm);
+ serial_outp(p, UART_LCR, old_lcr);
+
+ return id;
+}
+
/*
* This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's.
* When this function is called we know it is at least a StarTech
*/
static void autoconfig_has_efr(struct uart_8250_port *up)
{
- unsigned char id1, id2, id3, rev, saved_dll, saved_dlm;
+ unsigned int id1, id2, id3, rev;
/*
* Everything with an EFR has SLEEP
* 0x12 - XR16C2850.
* 0x14 - XR16C854.
*/
- serial_outp(up, UART_LCR, UART_LCR_DLAB);
- saved_dll = serial_inp(up, UART_DLL);
- saved_dlm = serial_inp(up, UART_DLM);
- serial_outp(up, UART_DLL, 0);
- serial_outp(up, UART_DLM, 0);
- id2 = serial_inp(up, UART_DLL);
- id1 = serial_inp(up, UART_DLM);
- serial_outp(up, UART_DLL, saved_dll);
- serial_outp(up, UART_DLM, saved_dlm);
-
- DEBUG_AUTOCONF("850id=%02x:%02x ", id1, id2);
-
- if (id1 == 0x10 || id1 == 0x12 || id1 == 0x14) {
- if (id1 == 0x10)
- up->rev = id2;
+ id1 = autoconfig_read_divisor_id(up);
+ DEBUG_AUTOCONF("850id=%04x ", id1);
+
+ id2 = id1 >> 8;
+ if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) {
+ if (id2 == 0x10)
+ up->rev = id1 & 255;
up->port.type = PORT_16850;
return;
}
up->port.type = PORT_16450;
}
+static int broken_efr(struct uart_8250_port *up)
+{
+ /*
+ * Exar ST16C2550 "A2" devices incorrectly detect as
+ * having an EFR, and report an ID of 0x0201. See
+ * http://www.exar.com/info.php?pdf=dan180_oct2004.pdf
+ */
+ if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16)
+ return 1;
+
+ return 0;
+}
+
/*
* We know that the chip has FIFOs. Does it have an EFR? The
* EFR is located in the same register position as the IIR and
static void autoconfig_16550a(struct uart_8250_port *up)
{
unsigned char status1, status2;
+ unsigned int iersave;
up->port.type = PORT_16550A;
up->capabilities |= UART_CAP_FIFO;
* (other ST16C650V2 UARTs, TI16C752A, etc)
*/
serial_outp(up, UART_LCR, 0xBF);
- if (serial_in(up, UART_EFR) == 0) {
+ if (serial_in(up, UART_EFR) == 0 && !broken_efr(up)) {
DEBUG_AUTOCONF("EFRv2 ");
autoconfig_has_efr(up);
return;
* from EXCR1. Switch back to bank 0, change it in MCR. Then
* switch back to bank 2, read it from EXCR1 again and check
* it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2
- * On PowerPC we don't want to change baud_base, as we have
- * a number of different divisors. -- Tom Rini
*/
serial_outp(up, UART_LCR, 0);
status1 = serial_in(up, UART_MCR);
serial_outp(up, UART_MCR, status1);
if ((status2 ^ status1) & UART_MCR_LOOP) {
-#ifndef CONFIG_PPC
+ unsigned short quot;
+
serial_outp(up, UART_LCR, 0xE0);
+
+ quot = serial_inp(up, UART_DLM) << 8;
+ quot += serial_inp(up, UART_DLL);
+ quot <<= 3;
+
status1 = serial_in(up, 0x04); /* EXCR1 */
status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
status1 |= 0x10; /* 1.625 divisor for baud_base --> 921600 */
serial_outp(up, 0x04, status1);
+
+ serial_outp(up, UART_DLL, quot & 0xff);
+ serial_outp(up, UART_DLM, quot >> 8);
+
serial_outp(up, UART_LCR, 0);
- up->port.uartclk = 921600*16;
-#endif
+ up->port.uartclk = 921600*16;
up->port.type = PORT_NS16550A;
up->capabilities |= UART_NATSEMI;
return;
serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
status2 = serial_in(up, UART_IIR) >> 5;
serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+ serial_outp(up, UART_LCR, 0);
DEBUG_AUTOCONF("iir1=%d iir2=%d ", status1, status2);
up->capabilities |= UART_CAP_AFE | UART_CAP_SLEEP;
return;
}
+
+ /*
+ * Try writing and reading the UART_IER_UUE bit (b6).
+ * If it works, this is probably one of the Xscale platform's
+ * internal UARTs.
+ * We're going to explicitly set the UUE bit to 0 before
+ * trying to write and read a 1 just to make sure it's not
+ * already a 1 and maybe locked there before we even start start.
+ */
+ iersave = serial_in(up, UART_IER);
+ serial_outp(up, UART_IER, iersave & ~UART_IER_UUE);
+ if (!(serial_in(up, UART_IER) & UART_IER_UUE)) {
+ /*
+ * OK it's in a known zero state, try writing and reading
+ * without disturbing the current state of the other bits.
+ */
+ serial_outp(up, UART_IER, iersave | UART_IER_UUE);
+ if (serial_in(up, UART_IER) & UART_IER_UUE) {
+ /*
+ * It's an Xscale.
+ * We'll leave the UART_IER_UUE bit set to 1 (enabled).
+ */
+ DEBUG_AUTOCONF("Xscale ");
+ up->port.type = PORT_XSCALE;
+ up->capabilities |= UART_CAP_UUE;
+ return;
+ }
+ } else {
+ /*
+ * If we got here we couldn't force the IER_UUE bit to 0.
+ * Log it and continue.
+ */
+ DEBUG_AUTOCONF("Couldn't force IER_UUE to 0 ");
+ }
+ serial_outp(up, UART_IER, iersave);
}
/*
/* 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);
- /* If this failed then we will throw away the
- bytes but must do so to clear interrupts */
+ spin_lock(&up->port.lock);
+ }
+ /*
+ * If this failed then we will throw away the
+ * bytes but must do so to clear interrupts
+ */
}
ch = serial_inp(up, UART_RX);
flag = TTY_NORMAL;
up->port.icount.overrun++;
/*
- * Mask off conditions which should be ingored.
+ * Mask off conditions which should be ignored.
*/
lsr &= up->port.read_status_mask;
}
if (uart_handle_sysrq_char(&up->port, ch, regs))
goto ignore_char;
- if ((lsr & up->port.ignore_status_mask) == 0) {
- tty_insert_flip_char(tty, ch, flag);
- }
- if ((lsr & UART_LSR_OE) &&
- tty->flip.count < TTY_FLIPBUF_SIZE) {
- /*
- * Overrun is special, since it's reported
- * immediately, and doesn't affect the current
- * character.
- */
- tty_insert_flip_char(tty, 0, TTY_OVERRUN);
- }
+
+ uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
+
ignore_char:
lsr = serial_inp(up, UART_LSR);
} while ((lsr & UART_LSR_DR) && (max_count-- > 0));
+ spin_unlock(&up->port.lock);
tty_flip_buffer_push(tty);
+ spin_lock(&up->port.lock);
*status = lsr;
}
up->ier &= ~UART_IER_MSI;
if (UART_ENABLE_MS(&up->port, termios->c_cflag))
up->ier |= UART_IER_MSI;
- if (up->port.type == PORT_XSCALE)
+ if (up->capabilities & UART_CAP_UUE)
up->ier |= UART_IER_UUE | UART_IER_RTOIE;
serial_out(up, UART_IER, up->ier);
int probeflags = PROBE_ANY;
int ret;
-#ifdef CONFIG_MCA
/*
* Don't probe for MCA ports on non-MCA machines.
*/
if (up->port.flags & UPF_BOOT_ONLYMCA && !MCA_bus)
return;
-#endif
/*
* Find the region that we can probe for. This in turn
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
tmout = 1000000;
- while (--tmout &&
- ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
+ while (!(serial_in(up, UART_MSR) & UART_MSR_CTS) && --tmout) {
udelay(1);
+ if ((tmout % 1000) == 0)
+ touch_nmi_watchdog();
+ }
}
}
*/
ier = serial_in(up, UART_IER);
- if (up->port.type == PORT_XSCALE)
+ if (up->capabilities & UART_CAP_UUE)
serial_out(up, UART_IER, UART_IER_UUE);
else
serial_out(up, UART_IER, 0);
}
console_initcall(serial8250_console_init);
-static int __init serial8250_late_console_init(void)
-{
- if (!(serial8250_console.flags & CON_ENABLED))
- register_console(&serial8250_console);
- return 0;
-}
-late_initcall(serial8250_late_console_init);
-
static int __init find_port(struct uart_port *p)
{
int line;
return 0;
}
-static int serial8250_suspend(struct device *dev, u32 state, u32 level)
+static int serial8250_suspend(struct device *dev, pm_message_t state, u32 level)
{
int i;
*/
static DECLARE_MUTEX(serial_sem);
-/*
- * Are the two ports equivalent?
- */
-static int uart_match_port(struct uart_port *port1, struct uart_port *port2)
-{
- if (port1->iotype != port2->iotype)
- return 0;
-
- switch (port1->iotype) {
- case UPIO_PORT:
- return (port1->iobase == port2->iobase);
- case UPIO_HUB6:
- return (port1->iobase == port2->iobase) &&
- (port1->hub6 == port2->hub6);
- case UPIO_MEM:
- return (port1->membase == port2->membase);
- }
- return 0;
-}
-
static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port)
{
int i;
* If this fails an error is returned.
*
* On success the port is ready to use and the line number is returned.
+ *
+ * Note: this function is deprecated - use serial8250_register_port
+ * instead.
*/
int register_serial(struct serial_struct *req)
{
*
* Remove one serial port. This may not be called from interrupt
* context. We hand the port back to our local PM control.
+ *
+ * Note: this function is deprecated - use serial8250_unregister_port
+ * instead.
*/
void unregister_serial(int line)
{
git://git.onelab.eu / linux-2.6.git / blobdiff