From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from server5.sohosted.com (www.sohosted5.com [193.138.249.49]) by ozlabs.org (Postfix) with ESMTP id 8956367B8B for ; Mon, 20 Nov 2006 22:14:28 +1100 (EST) From: Stefan Roese To: linux-kernel@vger.kernel.org Subject: [PATCH] serial: Use real irq on UART0 (IRQ = 0) on PPC4xx systems Date: Mon, 20 Nov 2006 12:00:36 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Message-Id: <200611201200.36780.ml@stefan-roese.de> Cc: linuxppc-embedded@ozlabs.org List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This patch fixes a problem seen on multiple 4xx platforms, where the UART0 interrupt number is 0. The macro "is_real_interrupt" lead on those systems to not use an real interrupt but the timer based implementation. This problem was detected and fixed by Charles Gales and John Baxter from AMCC. Signed-off-by: Stefan Roese --- commit f83094acd3258575c9a5cdb1d65e241c16eff03a tree 72582c5eeb2a9c8ea57287616d51e42fff8ed641 parent f56f68c4e1977f0e884a304af4c617bed4909417 author Stefan Roese Sat, 18 Nov 2006 10:28:50 +0100 committer Stefan Roese Sat, 18 Nov 2006 10:28:50 +0100 drivers/serial/8250.c | 22 ++++++++++++++-------- 1 files changed, 14 insertions(+), 8 deletions(-) diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index e34bd03..a51679e 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -76,8 +76,14 @@ static unsigned int nr_uarts = CONFIG_SE * We default to IRQ0 for the "no irq" hack. Some * machine types want others as well - they're free * to redefine this in their header file. + * NOTE: Some PPC4xx use IRQ0 for a UART Interrupt, so + * we will assume that the IRQ is always real */ +#ifdef CONFIG_4xx +#define is_real_interrupt(irq) (1) +#else #define is_real_interrupt(irq) ((irq) != 0) +#endif #ifdef CONFIG_SERIAL_8250_DETECT_IRQ #define CONFIG_SERIAL_DETECT_IRQ 1