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[SERIAL] Support Au1x00 8250 UARTs using the generic 8250 driver.

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The offsets of the registers are in a different place, and
some parts cannot handle a full set of modem control signals.

Signed-off-by: Pantelis Antoniou <pantelis@embeddedalley.ocm>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Pantelis Antoniou
2005-11-06 09:07:03 +00:00
committed by Russell King
parent f912696ab3
commit 21c614a789
8 changed files with 185 additions and 3 deletions
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73
drivers/serial/8250.c
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@ -251,9 +251,53 @@ static const struct serial8250_config uart_config[] = {
},
};
#ifdef CONFIG_SERIAL_8250_AU1X00
/* Au1x00 UART hardware has a weird register layout */
static const u8 au_io_in_map[] = {
[UART_RX] = 0,
[UART_IER] = 2,
[UART_IIR] = 3,
[UART_LCR] = 5,
[UART_MCR] = 6,
[UART_LSR] = 7,
[UART_MSR] = 8,
};
static const u8 au_io_out_map[] = {
[UART_TX] = 1,
[UART_IER] = 2,
[UART_FCR] = 4,
[UART_LCR] = 5,
[UART_MCR] = 6,
};
/* sane hardware needs no mapping */
static inline int map_8250_in_reg(struct uart_8250_port *up, int offset)
{
if (up->port.iotype != UPIO_AU)
return offset;
return au_io_in_map[offset];
}
static inline int map_8250_out_reg(struct uart_8250_port *up, int offset)
{
if (up->port.iotype != UPIO_AU)
return offset;
return au_io_out_map[offset];
}
#else
/* sane hardware needs no mapping */
#define map_8250_in_reg(up, offset) (offset)
#define map_8250_out_reg(up, offset) (offset)
#endif
static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset)
{
offset <<= up->port.regshift;
offset = map_8250_in_reg(up, offset) << up->port.regshift;
switch (up->port.iotype) {
case UPIO_HUB6:
@ -266,6 +310,11 @@ static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset)
case UPIO_MEM32:
return readl(up->port.membase + offset);
#ifdef CONFIG_SERIAL_8250_AU1X00
case UPIO_AU:
return __raw_readl(up->port.membase + offset);
#endif
default:
return inb(up->port.iobase + offset);
}
@ -274,7 +323,7 @@ static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset)
static _INLINE_ void
serial_out(struct uart_8250_port *up, int offset, int value)
{
offset <<= up->port.regshift;
offset = map_8250_out_reg(up, offset) << up->port.regshift;
switch (up->port.iotype) {
case UPIO_HUB6:
@ -290,6 +339,12 @@ serial_out(struct uart_8250_port *up, int offset, int value)
writel(value, up->port.membase + offset);
break;
#ifdef CONFIG_SERIAL_8250_AU1X00
case UPIO_AU:
__raw_writel(value, up->port.membase + offset);
break;
#endif
default:
outb(value, up->port.iobase + offset);
}
@ -910,6 +965,13 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
}
}
#endif
#ifdef CONFIG_SERIAL_8250_AU1X00
/* if access method is AU, it is a 16550 with a quirk */
if (up->port.type == PORT_16550A && up->port.iotype == UPIO_AU)
up->bugs |= UART_BUG_NOMSR;
#endif
serial_outp(up, UART_LCR, save_lcr);
if (up->capabilities != uart_config[up->port.type].flags) {
@ -1057,6 +1119,10 @@ static void serial8250_enable_ms(struct uart_port *port)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
/* no MSR capabilities */
if (up->bugs & UART_BUG_NOMSR)
return;
up->ier |= UART_IER_MSI;
serial_out(up, UART_IER, up->ier);
}
@ -1774,7 +1840,8 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
* CTS flow control flag and modem status interrupts
*/
up->ier &= ~UART_IER_MSI;
if (UART_ENABLE_MS(&up->port, termios->c_cflag))
if (!(up->bugs & UART_BUG_NOMSR) &&
UART_ENABLE_MS(&up->port, termios->c_cflag))
up->ier |= UART_IER_MSI;
if (up->capabilities & UART_CAP_UUE)
up->ier |= UART_IER_UUE | UART_IER_RTOIE;