From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756913Ab2HTOxJ (ORCPT ); Mon, 20 Aug 2012 10:53:09 -0400 Received: from mail-pz0-f46.google.com ([209.85.210.46]:44536 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756809Ab2HTOuM (ORCPT ); Mon, 20 Aug 2012 10:50:12 -0400 From: Anton Vorontsov To: Russell King , Jason Wessel , Greg Kroah-Hartman , Alan Cox Cc: =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= , Colin Cross , John Stultz , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linaro-kernel@lists.linaro.org, patches@linaro.org, kernel-team@android.com, kgdb-bugreport@lists.sourceforge.net Subject: [PATCH 07/12] tty/serial/amba-pl011: Implement clear_irqs callback Date: Mon, 20 Aug 2012 07:47:25 -0700 Message-Id: <1345474050-8339-7-git-send-email-anton.vorontsov@linaro.org> X-Mailer: git-send-email 1.7.11.5 In-Reply-To: <20120820144449.GA32560@lizard> References: <20120820144449.GA32560@lizard> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It's all pretty straightforward, except for TXIM interrupt. The interrupt has meaning "ready to transmit", so it's almost always raised, and the only way to silence it is to mask it. But that's OK, ops->start_tx will unmask it. Signed-off-by: Anton Vorontsov --- drivers/tty/serial/amba-pl011.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 90f2302..cf9278c 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -1308,6 +1308,18 @@ static void pl010_put_poll_char(struct uart_port *port, writew(ch, uap->port.membase + UART01x_DR); } +static void pl010_clear_irqs(struct uart_port *port) +{ + struct uart_amba_port *uap = (struct uart_amba_port *)port; + unsigned char __iomem *regs = uap->port.membase; + + writew(readw(regs + UART011_MIS), regs + UART011_ICR); + /* + * There is no way to clear TXIM, this is "ready to transmit IRQ", so + * we simply mask it. ops->start_tx will unmask it. + */ + writew(readw(regs + UART011_IMSC) & ~UART011_TXIM, regs + UART011_IMSC); +} #endif /* CONFIG_CONSOLE_POLL */ static int pl011_hwinit(struct uart_port *port) @@ -1721,6 +1733,7 @@ static struct uart_ops amba_pl011_pops = { .poll_init = pl011_hwinit, .poll_get_char = pl010_get_poll_char, .poll_put_char = pl010_put_poll_char, + .clear_irqs = pl010_clear_irqs, #endif }; -- 1.7.11.5