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Work around some errata in the pxa serial code (copied from motorolas 2.4.x tree)
Index: linux-2.6.20.7/drivers/serial/pxa.c
===================================================================
--- linux-2.6.20.7.orig/drivers/serial/pxa.c 2007-04-21 13:57:46.000000000 -0300
+++ linux-2.6.20.7/drivers/serial/pxa.c 2007-04-21 14:05:03.000000000 -0300
@@ -29,6 +29,10 @@
#define SUPPORT_SYSRQ
#endif
+#define pxa_buggy_port(x) ({ \
+ int cpu_ver; asm("mrc%? p15, 0, %0, c0, c0" : "=r" (cpu_ver)); \
+ ((x) == PORT_PXA && (cpu_ver & ~1) == 0x69052100); })
+
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
@@ -195,7 +199,7 @@
if (uart_circ_empty(xmit))
serial_pxa_stop_tx(&up->port);
}
-
+static inline irqreturn_t serial_pxa_irq(int, void *);
static void serial_pxa_start_tx(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
@@ -203,6 +207,8 @@
if (!(up->ier & UART_IER_THRI)) {
up->ier |= UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
+ if (pxa_buggy_port(up->port.type))
+ serial_pxa_irq(up->port.irq, NULL);
}
}
@@ -298,6 +304,9 @@
mcr |= up->mcr;
+ if (pxa_buggy_port(up->port.type) && up->port.irq != 0)
+ mcr ^= UART_MCR_OUT2;
+
serial_out(up, UART_MCR, mcr);
}
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