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authorDavid Gibson <david@gibson.dropbear.id.au>2007-05-06 14:48:49 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 12:12:50 -0700
commitabb4a2390737867353ebafc012d45f2b03f3f944 (patch)
treee62e2ae859f235667eb2002ef9dd651e7c7a8ea0 /arch
parentbd71c182d5a02337305fc381831c11029dd17d64 (diff)
serial: define FIXED_PORT flag for serial_core
At present, the serial core always allows setserial in userspace to change the port address, irq and base clock of any serial port. That makes sense for legacy ISA ports, but not for (say) embedded ns16550 compatible serial ports at peculiar addresses. In these cases, the kernel code configuring the ports must know exactly where they are, and their clocking arrangements (which can be unusual on embedded boards). It doesn't make sense for userspace to change these settings. Therefore, this patch defines a UPF_FIXED_PORT flag for the uart_port structure. If this flag is set when the serial port is configured, any attempts to alter the port's type, io address, irq or base clock with setserial are ignored. In addition this patch uses the new flag for on-chip serial ports probed in arch/powerpc/kernel/legacy_serial.c, and for other hard-wired serial ports probed by drivers/serial/of_serial.c. Signed-off-by: David Gibson <dwg@au1.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/legacy_serial.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
index 63dd2c3ad95..ae4836ea744 100644
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -115,7 +115,8 @@ static int __init add_legacy_soc_port(struct device_node *np,
{
u64 addr;
const u32 *addrp;
- upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
+ upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ
+ | UPF_FIXED_PORT;
struct device_node *tsi = of_get_parent(np);
/* We only support ports that have a clock frequency properly