From patchwork Wed Mar 2 09:56:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Ilpo_J=C3=A4rvinen?= X-Patchwork-Id: 12765712 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A56DDC43219 for ; Wed, 2 Mar 2022 09:58:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240769AbiCBJ6n (ORCPT ); Wed, 2 Mar 2022 04:58:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240798AbiCBJ6L (ORCPT ); Wed, 2 Mar 2022 04:58:11 -0500 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B64D0BDE41; Wed, 2 Mar 2022 01:57:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1646215039; x=1677751039; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=VVGdFbQA5dpTmH1Oi8imwujW6M34G1DuUPJxrfXUWac=; b=dUJKeVCEss+KIYUuBxj/U2E91CJk4EQBdgVwdxdCiUH7IxQfuWD7ciBE 7CTSyFgpqzbdVXtLW0mcWNq7J8kRPZ18sBOU0ZUXVEmY2ky0rSw9aMlH6 S+dPvdcG7dZgST+UeOaYlEf1g296G0Vox4JkeCC4li8fuF3CgPIOBtxRO tcjGWlRvmtCknvVFzT5EmYFYRxjoKHyKE6Z6TPvG/mUAx5FK1VGd47s2w CAO8N0OKnJMehp6YSj03+QefFnWqLPSLcHb84M/Kz2WIHu6zeZlrts2Tr +bOCE5qMaBYaM5ifYiinoASp/vYfJoEIOQ6pKOsJRY6pMTMTC0FWz2kNF A==; X-IronPort-AV: E=McAfee;i="6200,9189,10273"; a="240777082" X-IronPort-AV: E=Sophos;i="5.90,148,1643702400"; d="scan'208";a="240777082" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Mar 2022 01:57:19 -0800 X-IronPort-AV: E=Sophos;i="5.90,148,1643702400"; d="scan'208";a="551182160" Received: from abotoi-mobl2.ger.corp.intel.com (HELO ijarvine-MOBL2.ger.corp.intel.com) ([10.251.218.48]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Mar 2022 01:57:12 -0800 From: =?utf-8?q?Ilpo_J=C3=A4rvinen?= To: linux-serial@vger.kernel.org, Jiri Slaby , Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org, Lukas Wunner , Johan Hovold , Andy Shevchenko , Heikki Krogerus , =?utf-8?q?Ilpo_J=C3=A4rv?= =?utf-8?q?inen?= , linux-api@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , Matt Turner , linux-alpha@vger.kernel.org, Thomas Bogendoerfer , linux-mips@vger.kernel.org, "James E.J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, "David S. Miller" , sparclinux@vger.kernel.org, Arnd Bergmann , linux-arch@vger.kernel.org, linux-usb@vger.kernel.org Subject: [RFC PATCH 5/7] serial: termbits: ADDRB to indicate 9th bit addressing mode Date: Wed, 2 Mar 2022 11:56:04 +0200 Message-Id: <20220302095606.14818-6-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220302095606.14818-1-ilpo.jarvinen@linux.intel.com> References: <20220302095606.14818-1-ilpo.jarvinen@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org Add ADDRB to termbits to indicate 9th bit addressing mode. This change is necessary for supporting devices with RS485 multipoint addressing [*]. A later patch in the patch series adds support for Synopsys Designware UART capable for 9th bit addressing mode. In this mode, 9th bit is used to indicate an address (byte) within the communication line. The 9th bit addressing mode is selected using ADDRB introduced by an earlier patch. [*] Technically, RS485 is just an electronic spec and does not itself specify the 9th bit addressing mode but 9th bit seems at least "semi-standard" way to do addressing with RS485. Cc: linux-api@vger.kernel.org Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Cc: linux-alpha@vger.kernel.org Cc: Thomas Bogendoerfer Cc: linux-mips@vger.kernel.org Cc: "James E.J. Bottomley" Cc: Helge Deller Cc: linux-parisc@vger.kernel.org Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: linuxppc-dev@lists.ozlabs.org Cc: "David S. Miller" Cc: sparclinux@vger.kernel.org Cc: Arnd Bergmann Cc: linux-arch@vger.kernel.org Cc: linux-usb@vger.kernel.org Signed-off-by: Ilpo Järvinen --- arch/alpha/include/uapi/asm/termbits.h | 1 + arch/mips/include/uapi/asm/termbits.h | 1 + arch/parisc/include/uapi/asm/termbits.h | 1 + arch/powerpc/include/uapi/asm/termbits.h | 1 + arch/sparc/include/uapi/asm/termbits.h | 1 + drivers/tty/amiserial.c | 6 +++++- drivers/tty/moxa.c | 1 + drivers/tty/mxser.c | 1 + drivers/tty/serial/serial_core.c | 2 ++ drivers/tty/tty_ioctl.c | 2 ++ drivers/usb/serial/usb-serial.c | 5 +++-- include/uapi/asm-generic/termbits.h | 1 + 12 files changed, 20 insertions(+), 3 deletions(-) diff --git a/arch/alpha/include/uapi/asm/termbits.h b/arch/alpha/include/uapi/asm/termbits.h index 4575ba34a0ea..285169c794ec 100644 --- a/arch/alpha/include/uapi/asm/termbits.h +++ b/arch/alpha/include/uapi/asm/termbits.h @@ -180,6 +180,7 @@ struct ktermios { #define HUPCL 00040000 #define CLOCAL 00100000 +#define ADDRB 010000000 /* address bit */ #define CMSPAR 010000000000 /* mark or space (stick) parity */ #define CRTSCTS 020000000000 /* flow control */ diff --git a/arch/mips/include/uapi/asm/termbits.h b/arch/mips/include/uapi/asm/termbits.h index dfeffba729b7..e7ea31cfec78 100644 --- a/arch/mips/include/uapi/asm/termbits.h +++ b/arch/mips/include/uapi/asm/termbits.h @@ -181,6 +181,7 @@ struct ktermios { #define B3000000 0010015 #define B3500000 0010016 #define B4000000 0010017 +#define ADDRB 0020000 /* address bit */ #define CIBAUD 002003600000 /* input baud rate */ #define CMSPAR 010000000000 /* mark or space (stick) parity */ #define CRTSCTS 020000000000 /* flow control */ diff --git a/arch/parisc/include/uapi/asm/termbits.h b/arch/parisc/include/uapi/asm/termbits.h index 40e920f8d683..629be061f5d5 100644 --- a/arch/parisc/include/uapi/asm/termbits.h +++ b/arch/parisc/include/uapi/asm/termbits.h @@ -158,6 +158,7 @@ struct ktermios { #define B3000000 0010015 #define B3500000 0010016 #define B4000000 0010017 +#define ADDRB 0020000 /* address bit */ #define CIBAUD 002003600000 /* input baud rate */ #define CMSPAR 010000000000 /* mark or space (stick) parity */ #define CRTSCTS 020000000000 /* flow control */ diff --git a/arch/powerpc/include/uapi/asm/termbits.h b/arch/powerpc/include/uapi/asm/termbits.h index ed18bc61f63d..1b778ac562a4 100644 --- a/arch/powerpc/include/uapi/asm/termbits.h +++ b/arch/powerpc/include/uapi/asm/termbits.h @@ -171,6 +171,7 @@ struct ktermios { #define HUPCL 00040000 #define CLOCAL 00100000 +#define ADDRB 00200000 /* address bit */ #define CMSPAR 010000000000 /* mark or space (stick) parity */ #define CRTSCTS 020000000000 /* flow control */ diff --git a/arch/sparc/include/uapi/asm/termbits.h b/arch/sparc/include/uapi/asm/termbits.h index ce5ad5d0f105..4ad60c4acf65 100644 --- a/arch/sparc/include/uapi/asm/termbits.h +++ b/arch/sparc/include/uapi/asm/termbits.h @@ -200,6 +200,7 @@ struct ktermios { #define B3000000 0x00001011 #define B3500000 0x00001012 #define B4000000 0x00001013 */ +#define ADDRB 0x00002000 /* address bit */ #define CIBAUD 0x100f0000 /* input baud rate (not used) */ #define CMSPAR 0x40000000 /* mark or space (stick) parity */ #define CRTSCTS 0x80000000 /* flow control */ diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c index 533d02b38e02..3ca97007bd6e 100644 --- a/drivers/tty/amiserial.c +++ b/drivers/tty/amiserial.c @@ -1175,7 +1175,11 @@ static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) { struct serial_state *info = tty->driver_data; unsigned long flags; - unsigned int cflag = tty->termios.c_cflag; + unsigned int cflag; + + tty->termios.c_cflag &= ~ADDRB; + + cflag = tty->termios.c_cflag; change_speed(tty, info, old_termios); diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c index f3c72ab1476c..07cd88152d58 100644 --- a/drivers/tty/moxa.c +++ b/drivers/tty/moxa.c @@ -2050,6 +2050,7 @@ static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio, ofsAddr = port->tableAddr; + termio->c_cflag &= ~ADDRB; mode = termio->c_cflag & CSIZE; if (mode == CS5) mode = MX_CS5; diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c index 836c9eca2946..220676363a07 100644 --- a/drivers/tty/mxser.c +++ b/drivers/tty/mxser.c @@ -577,6 +577,7 @@ static void mxser_change_speed(struct tty_struct *tty, struct ktermios *old_term struct mxser_port *info = tty->driver_data; unsigned cflag, cval; + tty->termios.c_cflag &= ~ADDRB; cflag = tty->termios.c_cflag; if (mxser_set_baud(tty, tty_get_baud_rate(tty))) { diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 846192a7b4bf..8ab88293c917 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1489,6 +1489,8 @@ static void uart_set_termios(struct tty_struct *tty, goto out; } + tty->termios.c_cflag &= ~ADDRB; + uart_change_speed(tty, state, old_termios); /* reload cflag from termios; port driver may have overridden flags */ cflag = tty->termios.c_cflag; diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c index 63181925ec1a..934037d78868 100644 --- a/drivers/tty/tty_ioctl.c +++ b/drivers/tty/tty_ioctl.c @@ -319,6 +319,8 @@ unsigned char tty_get_frame_size(unsigned int cflag) bits++; if (cflag & PARENB) bits++; + if (cflag & ADDRB) + bits++; return bits; } diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 24101bd7fcad..44b73aea80bb 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -525,9 +525,10 @@ static void serial_set_termios(struct tty_struct *tty, struct ktermios *old) dev_dbg(&port->dev, "%s\n", __func__); - if (port->serial->type->set_termios) + if (port->serial->type->set_termios) { + tty->termios.c_cflag &= ~ADDRB; port->serial->type->set_termios(tty, port, old); - else + } else tty_termios_copy_hw(&tty->termios, old); } diff --git a/include/uapi/asm-generic/termbits.h b/include/uapi/asm-generic/termbits.h index 2fbaf9ae89dd..5f5228329d45 100644 --- a/include/uapi/asm-generic/termbits.h +++ b/include/uapi/asm-generic/termbits.h @@ -157,6 +157,7 @@ struct ktermios { #define B3000000 0010015 #define B3500000 0010016 #define B4000000 0010017 +#define ADDRB 0020000 /* address bit */ #define CIBAUD 002003600000 /* input baud rate */ #define CMSPAR 010000000000 /* mark or space (stick) parity */ #define CRTSCTS 020000000000 /* flow control */