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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-06-23 10:43:04 +0100
committerRussell King <rmk@dyn-67.arm.linux.org.uk>2005-06-23 10:43:04 +0100
commit4ba5e35daa90871fcb9b01f5ad1e5723343cc0a9 (patch)
tree26c52f5ff50c54f210c53e986f565c6f29409ca1 /drivers/serial
parentb7c84c6ada2be942eca6722edb2cfaad412cd5de (diff)
downloadop-kernel-dev-4ba5e35daa90871fcb9b01f5ad1e5723343cc0a9.zip
op-kernel-dev-4ba5e35daa90871fcb9b01f5ad1e5723343cc0a9.tar.gz
[PATCH] Serial: Convert 8250 revision-based bug fixes to bug bitmask
For some 8250 port types, we used to check the type of the port, and then determine whether the chip revision means the device is buggy. Instead, introduce a bit array, and set the appropriate bit(s) when we discover a buggy device. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/8250.c23
-rw-r--r--drivers/serial/8250.h2
2 files changed, 15 insertions, 10 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 30e8beb..27cc288 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -132,9 +132,9 @@ struct uart_8250_port {
struct uart_port port;
struct timer_list timer; /* "no irq" timer */
struct list_head list; /* ports on this IRQ */
- unsigned int capabilities; /* port capabilities */
+ unsigned short capabilities; /* port capabilities */
+ unsigned short bugs; /* port bugs */
unsigned int tx_loadsz; /* transmit fifo load size */
- unsigned short rev;
unsigned char acr;
unsigned char ier;
unsigned char lcr;
@@ -560,7 +560,14 @@ static void autoconfig_has_efr(struct uart_8250_port *up)
if (id1 == 0x16 && id2 == 0xC9 &&
(id3 == 0x50 || id3 == 0x52 || id3 == 0x54)) {
up->port.type = PORT_16C950;
- up->rev = rev | (id3 << 8);
+
+ /*
+ * Enable work around for the Oxford Semiconductor 952 rev B
+ * chip which causes it to seriously miscalculate baud rates
+ * when DLL is 0.
+ */
+ if (id3 == 0x52 && rev == 0x01)
+ up->bugs |= UART_BUG_QUOT;
return;
}
@@ -577,8 +584,6 @@ static void autoconfig_has_efr(struct uart_8250_port *up)
id2 = id1 >> 8;
if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) {
- if (id2 == 0x10)
- up->rev = id1 & 255;
up->port.type = PORT_16850;
return;
}
@@ -809,6 +814,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
// save_flags(flags); cli();
up->capabilities = 0;
+ up->bugs = 0;
if (!(up->port.flags & UPF_BUGGY_UART)) {
/*
@@ -1677,12 +1683,9 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
quot = serial8250_get_divisor(port, baud);
/*
- * Work around a bug in the Oxford Semiconductor 952 rev B
- * chip which causes it to seriously miscalculate baud rates
- * when DLL is 0.
+ * Oxford Semi 952 rev B workaround
*/
- if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
- up->rev == 0x5201)
+ if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0)
quot ++;
if (up->capabilities & UART_CAP_FIFO && up->port.fifosize > 1) {
diff --git a/drivers/serial/8250.h b/drivers/serial/8250.h
index 4f3d62f..cd5c3dd 100644
--- a/drivers/serial/8250.h
+++ b/drivers/serial/8250.h
@@ -51,6 +51,8 @@ struct serial8250_config {
#define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */
#define UART_CAP_UUE (1 << 12) /* UART needs IER bit 6 set (Xscale) */
+#define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */
+
#if defined(__i386__) && (defined(CONFIG_M386) || defined(CONFIG_M486))
#define _INLINE_ inline
#else
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