unsigned char mcr;
unsigned char mcr_mask; /* mask of user bits */
unsigned char mcr_force; /* mask of forced bits */
- unsigned char lsr_break_flag;
+
+ /*
+ * Some bits in registers are cleared on a read, so they must
+ * be saved whenever the register is read but the bits will not
+ * be immediately processed.
+ */
+#define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
+ unsigned char lsr_saved_flags;
+#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
+ unsigned char msr_saved_flags;
/*
* We provide a per-port pm hook.
.fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
.flags = UART_CAP_FIFO | UART_CAP_UUE,
},
+ [PORT_RM9000] = {
+ .name = "RM9000",
+ .fifo_size = 16,
+ .tx_loadsz = 16,
+ .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+ .flags = UART_CAP_FIFO,
+ },
};
-#ifdef CONFIG_SERIAL_8250_AU1X00
+#if defined (CONFIG_SERIAL_8250_AU1X00)
/* Au1x00 UART hardware has a weird register layout */
static const u8 au_io_in_map[] = {
return au_io_out_map[offset];
}
+#elif defined (CONFIG_SERIAL_8250_RM9K)
+
+static const u8
+ regmap_in[8] = {
+ [UART_RX] = 0x00,
+ [UART_IER] = 0x0c,
+ [UART_IIR] = 0x14,
+ [UART_LCR] = 0x1c,
+ [UART_MCR] = 0x20,
+ [UART_LSR] = 0x24,
+ [UART_MSR] = 0x28,
+ [UART_SCR] = 0x2c
+ },
+ regmap_out[8] = {
+ [UART_TX] = 0x04,
+ [UART_IER] = 0x0c,
+ [UART_FCR] = 0x18,
+ [UART_LCR] = 0x1c,
+ [UART_MCR] = 0x20,
+ [UART_LSR] = 0x24,
+ [UART_MSR] = 0x28,
+ [UART_SCR] = 0x2c
+ };
+
+static inline int map_8250_in_reg(struct uart_8250_port *up, int offset)
+{
+ if (up->port.iotype != UPIO_RM9000)
+ return offset;
+ return regmap_in[offset];
+}
+
+static inline int map_8250_out_reg(struct uart_8250_port *up, int offset)
+{
+ if (up->port.iotype != UPIO_RM9000)
+ return offset;
+ return regmap_out[offset];
+}
+
#else
/* sane hardware needs no mapping */
return inb(up->port.iobase + 1);
case UPIO_MEM:
+ case UPIO_DWAPB:
return readb(up->port.membase + offset);
+ case UPIO_RM9000:
case UPIO_MEM32:
return readl(up->port.membase + offset);
static void
serial_out(struct uart_8250_port *up, int offset, int value)
{
+ /* Save the offset before it's remapped */
+ int save_offset = offset;
offset = map_8250_out_reg(up, offset) << up->port.regshift;
switch (up->port.iotype) {
writeb(value, up->port.membase + offset);
break;
+ case UPIO_RM9000:
case UPIO_MEM32:
writel(value, up->port.membase + offset);
break;
writeb(value, up->port.membase + offset);
break;
+ case UPIO_DWAPB:
+ /* Save the LCR value so it can be re-written when a
+ * Busy Detect interrupt occurs. */
+ if (save_offset == UART_LCR)
+ up->lcr = value;
+ writeb(value, up->port.membase + offset);
+ /* Read the IER to ensure any interrupt is cleared before
+ * returning from ISR. */
+ if (save_offset == UART_TX || save_offset == UART_IER)
+ value = serial_in(up, UART_IER);
+ break;
+
default:
outb(value, up->port.iobase + offset);
}
#ifdef CONFIG_SERIAL_8250_AU1X00
case UPIO_AU:
#endif
+ case UPIO_DWAPB:
serial_out(up, offset, value);
serial_in(up, UART_LCR); /* safe, no side-effects */
break;
serial_outp(up, UART_DLM, value >> 8 & 0xff);
}
-#ifdef CONFIG_SERIAL_8250_AU1X00
+#if defined (CONFIG_SERIAL_8250_AU1X00)
/* Au1x00 haven't got a standard divisor latch */
static int serial_dl_read(struct uart_8250_port *up)
{
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)
* its clones. (We treat the broken original StarTech 16650 V1 as a
* 16550, and why not? Startech doesn't seem to even acknowledge its
* existence.)
- *
+ *
* What evil have men's minds wrought...
*/
static void autoconfig_has_efr(struct uart_8250_port *up)
up->bugs |= UART_BUG_QUOT;
return;
}
-
+
/*
* We check for a XR16C850 by setting DLL and DLM to 0, and then
* reading back DLL and DLM. The chip type depends on the DLM
quot = serial_dl_read(up);
quot <<= 3;
- status1 = serial_in(up, 0x04); /* EXCR1 */
+ status1 = serial_in(up, 0x04); /* EXCR2 */
status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
status1 |= 0x10; /* 1.625 divisor for baud_base --> 921600 */
serial_outp(up, 0x04, status1);
-
+
serial_dl_write(up, quot);
serial_outp(up, UART_LCR, 0);
* be frobbing the chips IRQ enable register to see if it exists.
*/
spin_lock_irqsave(&up->port.lock, flags);
-// save_flags(flags); cli();
up->capabilities = 0;
up->bugs = 0;
/*
* Do a simple existence test first; if we fail this,
* there's no point trying anything else.
- *
+ *
* 0x80 is used as a nonsense port to prevent against
* false positives due to ISA bus float. The
* assumption is that 0x80 is a non-existent port;
save_mcr = serial_in(up, UART_MCR);
save_lcr = serial_in(up, UART_LCR);
- /*
+ /*
* Check to see if a UART is really there. Certain broken
* internal modems based on the Rockwell chipset fail this
* test, because they apparently don't implement the loopback
else
serial_outp(up, UART_IER, 0);
- out:
+ out:
spin_unlock_irqrestore(&up->port.lock, flags);
-// restore_flags(flags);
DEBUG_AUTOCONF("type=%s\n", uart_config[up->port.type].name);
}
save_mcr = serial_inp(up, UART_MCR);
save_ier = serial_inp(up, UART_IER);
serial_outp(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2);
-
+
irqs = probe_irq_on();
serial_outp(up, UART_MCR, 0);
udelay (10);
if (up->bugs & UART_BUG_TXEN) {
unsigned char lsr, iir;
lsr = serial_in(up, UART_LSR);
- iir = serial_in(up, UART_IIR);
- if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT)
+ up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
+ iir = serial_in(up, UART_IIR) & 0x0f;
+ if ((up->port.type == PORT_RM9000) ?
+ (lsr & UART_LSR_THRE &&
+ (iir == UART_IIR_NO_INT || iir == UART_IIR_THRI)) :
+ (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT))
transmit_chars(up);
}
}
flag = TTY_NORMAL;
up->port.icount.rx++;
-#ifdef CONFIG_SERIAL_8250_CONSOLE
- /*
- * Recover the break flag from console xmit
- */
- if (up->port.line == up->port.cons->index) {
- lsr |= up->lsr_break_flag;
- up->lsr_break_flag = 0;
- }
-#endif
+ lsr |= up->lsr_saved_flags;
+ up->lsr_saved_flags = 0;
- if (unlikely(lsr & (UART_LSR_BI | UART_LSR_PE |
- UART_LSR_FE | UART_LSR_OE))) {
+ if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
/*
* For statistics only
*/
{
unsigned int status = serial_in(up, UART_MSR);
+ status |= up->msr_saved_flags;
+ up->msr_saved_flags = 0;
if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
up->port.info != NULL) {
if (status & UART_MSR_TERI)
handled = 1;
end = NULL;
+ } else if (up->port.iotype == UPIO_DWAPB &&
+ (iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
+ /* The DesignWare APB UART has an Busy Detect (0x07)
+ * interrupt meaning an LCR write attempt occured while the
+ * UART was busy. The interrupt must be cleared by reading
+ * the UART status register (USR) and the LCR re-written. */
+ unsigned int status;
+ status = *(volatile u32 *)up->port.private_data;
+ serial_out(up, UART_LCR, up->lcr);
+
+ handled = 1;
+
+ end = NULL;
} else if (end == NULL)
end = l;
static void serial8250_backup_timeout(unsigned long data)
{
struct uart_8250_port *up = (struct uart_8250_port *)data;
- unsigned int iir, ier = 0;
+ unsigned int iir, ier = 0, lsr;
+ unsigned long flags;
/*
* Must disable interrupts or else we risk racing with the interrupt
* the "Diva" UART used on the management processor on many HP
* ia64 and parisc boxes.
*/
+ spin_lock_irqsave(&up->port.lock, flags);
+ lsr = serial_in(up, UART_LSR);
+ up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
+ spin_unlock_irqrestore(&up->port.lock, flags);
if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
(!uart_circ_empty(&up->port.info->xmit) || up->port.x_char) &&
- (serial_in(up, UART_LSR) & UART_LSR_THRE)) {
+ (lsr & UART_LSR_THRE)) {
iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
iir |= UART_IIR_THRI;
}
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
unsigned long flags;
- unsigned int ret;
+ unsigned int lsr;
spin_lock_irqsave(&up->port.lock, flags);
- ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+ lsr = serial_in(up, UART_LSR);
+ up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
spin_unlock_irqrestore(&up->port.lock, flags);
- return ret;
+ return lsr & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
}
static unsigned int serial8250_get_mctrl(struct uart_port *port)
do {
status = serial_in(up, UART_LSR);
- if (status & UART_LSR_BI)
- up->lsr_break_flag = UART_LSR_BI;
+ up->lsr_saved_flags |= status & LSR_SAVE_FLAGS;
if (--tmout == 0)
break;
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
- tmout = 1000000;
- while (!(serial_in(up, UART_MSR) & UART_MSR_CTS) && --tmout) {
+ unsigned int tmout;
+ for (tmout = 1000000; tmout; tmout--) {
+ unsigned int msr = serial_in(up, UART_MSR);
+ up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
+ if (msr & UART_MSR_CTS)
+ break;
udelay(1);
touch_nmi_watchdog();
}
spin_unlock_irqrestore(&up->port.lock, flags);
/*
+ * Clear the interrupt registers again for luck, and clear the
+ * saved flags to avoid getting false values from polling
+ * routines or the previous session.
+ */
+ serial_inp(up, UART_LSR);
+ serial_inp(up, UART_RX);
+ serial_inp(up, UART_IIR);
+ serial_inp(up, UART_MSR);
+ up->lsr_saved_flags = 0;
+ up->msr_saved_flags = 0;
+
+ /*
* Finally, enable interrupts. Note: Modem status interrupts
* are set via set_termios(), which will be occurring imminently
* anyway, so we don't enable them here.
(void) inb_p(icp);
}
- /*
- * And clear the interrupt registers again for luck.
- */
- (void) serial_inp(up, UART_LSR);
- (void) serial_inp(up, UART_RX);
- (void) serial_inp(up, UART_IIR);
- (void) serial_inp(up, UART_MSR);
-
return 0;
}
/*
* Ask the core to calculate the divisor for us.
*/
- baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
quot = serial8250_get_divisor(port, baud);
/*
case UPIO_TSI:
case UPIO_MEM32:
case UPIO_MEM:
+ case UPIO_DWAPB:
if (!up->port.mapbase)
break;
case UPIO_TSI:
case UPIO_MEM32:
case UPIO_MEM:
+ case UPIO_DWAPB:
if (!up->port.mapbase)
break;
wait_for_xmitr(up, BOTH_EMPTY);
serial_out(up, UART_IER, ier);
+ /*
+ * The receive handling will happen properly because the
+ * receive ready bit will still be set; it is not cleared
+ * on read. However, modem control will not, we must
+ * call it if we have saved something in the saved flags
+ * while processing with interrupts off.
+ */
+ if (up->msr_saved_flags)
+ check_modem_status(up);
+
if (locked)
spin_unlock(&up->port.lock);
local_irq_restore(flags);
return uart_set_options(port, co, baud, parity, bits, flow);
}
+static int serial8250_console_early_setup(void)
+{
+ return serial8250_find_port_for_earlycon();
+}
+
static struct uart_driver serial8250_reg;
static struct console serial8250_console = {
.name = "ttyS",
.write = serial8250_console_write,
.device = uart_console_device,
.setup = serial8250_console_setup,
+ .early_setup = serial8250_console_early_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &serial8250_reg,
}
console_initcall(serial8250_console_init);
-static int __init find_port(struct uart_port *p)
+int serial8250_find_port(struct uart_port *p)
{
int line;
struct uart_port *port;
return -ENODEV;
}
-int __init serial8250_start_console(struct uart_port *port, char *options)
-{
- int line;
-
- line = find_port(port);
- if (line < 0)
- return -ENODEV;
-
- add_preferred_console("ttyS", line, options);
- printk("Adding console on ttyS%d at %s 0x%lx (options '%s')\n",
- line, port->iotype == UPIO_MEM ? "MMIO" : "I/O port",
- port->iotype == UPIO_MEM ? (unsigned long) port->mapbase :
- (unsigned long) port->iobase, options);
- if (!(serial8250_console.flags & CON_ENABLED)) {
- serial8250_console.flags &= ~CON_PRINTBUFFER;
- register_console(&serial8250_console);
- }
- return line;
-}
-
#define SERIAL8250_CONSOLE &serial8250_console
#else
#define SERIAL8250_CONSOLE NULL
*/
void serial8250_resume_port(int line)
{
- uart_resume_port(&serial8250_reg, &serial8250_ports[line].port);
+ struct uart_8250_port *up = &serial8250_ports[line];
+
+ if (up->capabilities & UART_NATSEMI) {
+ unsigned char tmp;
+
+ /* Ensure it's still in high speed mode */
+ serial_outp(up, UART_LCR, 0xE0);
+
+ tmp = serial_in(up, 0x04); /* EXCR2 */
+ tmp &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
+ tmp |= 0x10; /* 1.625 divisor for baud_base --> 921600 */
+ serial_outp(up, 0x04, tmp);
+
+ serial_outp(up, UART_LCR, 0);
+ }
+ uart_resume_port(&serial8250_reg, &up->port);
}
/*
ret = serial8250_register_port(&port);
if (ret < 0) {
dev_err(&dev->dev, "unable to register port at index %d "
- "(IO%lx MEM%lx IRQ%d): %d\n", i,
- p->iobase, p->mapbase, p->irq, ret);
+ "(IO%lx MEM%llx IRQ%d): %d\n", i,
+ p->iobase, (unsigned long long)p->mapbase,
+ p->irq, ret);
}
}
return 0;
struct uart_8250_port *up = &serial8250_ports[i];
if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
- uart_resume_port(&serial8250_reg, &up->port);
+ serial8250_resume_port(i);
}
return 0;