From patchwork Tue Apr 26 12:24:43 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: 12827022 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 8E34BC433F5 for ; Tue, 26 Apr 2022 12:27:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349945AbiDZMar (ORCPT ); Tue, 26 Apr 2022 08:30:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349961AbiDZMam (ORCPT ); Tue, 26 Apr 2022 08:30:42 -0400 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0085D6AA48; Tue, 26 Apr 2022 05:27:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1650976046; x=1682512046; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=JFdiSI2jxgYQfx4wblcqQ6dbj7vYHduQcL+/CQ4c/k4=; b=g9I9/IudkHZUQo8og/kM3hDRTTRDU+nB98+DLrMUPfudz6jWsLxLzim0 UH3ZTPug5fWx6GUb20YTRWrtmdHn3VEQrwIVohwGyyC5dNWtLE0g1Hsq0 M4HeVlTfsGnlTyQjLVB+PeRt4P47lNMc7uqE4YXV5iNNaBND90JOW8uYS l5BbMJauQ6YlB6cK6LRkpV0/U3pkMFgEMzacBVI0kviCe1RXO0ar+zdGv JUaB1WrJASt3KZ0JwWG6m1lAoeD03MON+ud6sPlqWmcNC0NUa4AJewbDn Zfl3t4x//Nd9v8XmP/sMMobiIxaofbCXD2Tu/MUzh7pKC32g1tUZn9wnA g==; X-IronPort-AV: E=McAfee;i="6400,9594,10328"; a="252934816" X-IronPort-AV: E=Sophos;i="5.90,290,1643702400"; d="scan'208";a="252934816" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Apr 2022 05:27:25 -0700 X-IronPort-AV: E=Sophos;i="5.90,290,1643702400"; d="scan'208";a="579864899" Received: from mmilkovx-mobl.amr.corp.intel.com (HELO ijarvine-MOBL2.ger.corp.intel.com) ([10.249.47.245]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Apr 2022 05:27:17 -0700 From: =?utf-8?q?Ilpo_J=C3=A4rvinen?= To: linux-serial@vger.kernel.org, Greg KH Cc: Jiri Slaby , Lukas Wunner , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K?= =?utf-8?q?=C3=B6nig?= , Vicente Bergas , Johan Hovold , heiko@sntech.de, giulio.benetti@micronovasrl.com, Heikki Krogerus , =?utf-8?q?Ilpo_J=C3=A4rv?= =?utf-8?q?inen?= , linux-api@vger.kernel.org, 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: [PATCH v5 05/10] serial: termbits: ADDRB to indicate 9th bit addressing mode Date: Tue, 26 Apr 2022 15:24:43 +0300 Message-Id: <20220426122448.38997-6-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220426122448.38997-1-ilpo.jarvinen@linux.intel.com> References: <20220426122448.38997-1-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: 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/char/pcmcia/synclink_cs.c | 2 ++ drivers/ipack/devices/ipoctal.c | 2 ++ drivers/mmc/core/sdio_uart.c | 2 ++ drivers/net/usb/hso.c | 3 ++- drivers/s390/char/tty3270.c | 3 +++ drivers/staging/greybus/uart.c | 2 ++ drivers/tty/amiserial.c | 6 +++++- drivers/tty/moxa.c | 1 + drivers/tty/mxser.c | 1 + drivers/tty/serial/serial_core.c | 2 ++ drivers/tty/synclink_gt.c | 2 ++ drivers/tty/tty_ioctl.c | 2 ++ drivers/usb/class/cdc-acm.c | 2 ++ drivers/usb/serial/usb-serial.c | 6 ++++-- include/uapi/asm-generic/termbits.h | 1 + net/bluetooth/rfcomm/tty.c | 2 ++ 21 files changed, 40 insertions(+), 4 deletions(-) diff --git a/arch/alpha/include/uapi/asm/termbits.h b/arch/alpha/include/uapi/asm/termbits.h index 4575ba34a0ea..0c123e715486 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 004000000000 /* 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..4732d31b0e4e 100644 --- a/arch/mips/include/uapi/asm/termbits.h +++ b/arch/mips/include/uapi/asm/termbits.h @@ -182,6 +182,7 @@ struct ktermios { #define B3500000 0010016 #define B4000000 0010017 #define CIBAUD 002003600000 /* input baud rate */ +#define ADDRB 004000000000 /* address bit */ #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..d6bbd10d92ba 100644 --- a/arch/parisc/include/uapi/asm/termbits.h +++ b/arch/parisc/include/uapi/asm/termbits.h @@ -159,6 +159,7 @@ struct ktermios { #define B3500000 0010016 #define B4000000 0010017 #define CIBAUD 002003600000 /* input baud rate */ +#define ADDRB 004000000000 /* address bit */ #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..c6a033732f39 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 004000000000 /* 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..5eb1d547b5c4 100644 --- a/arch/sparc/include/uapi/asm/termbits.h +++ b/arch/sparc/include/uapi/asm/termbits.h @@ -201,6 +201,7 @@ struct ktermios { #define B3500000 0x00001012 #define B4000000 0x00001013 */ #define CIBAUD 0x100f0000 /* input baud rate (not used) */ +#define ADDRB 0x20000000 /* address bit */ #define CMSPAR 0x40000000 /* mark or space (stick) parity */ #define CRTSCTS 0x80000000 /* flow control */ diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c index 78baba55a8b5..d179b9b57a25 100644 --- a/drivers/char/pcmcia/synclink_cs.c +++ b/drivers/char/pcmcia/synclink_cs.c @@ -2287,6 +2287,8 @@ static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_term == RELEVANT_IFLAG(old_termios->c_iflag))) return; + tty->termios.c_cflag &= ~ADDRB; + mgslpc_change_params(info, tty); /* Handle transition to B0 status */ diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c index 20d2b9ec1227..d66cc9683ebc 100644 --- a/drivers/ipack/devices/ipoctal.c +++ b/drivers/ipack/devices/ipoctal.c @@ -506,6 +506,8 @@ static void ipoctal_set_termios(struct tty_struct *tty, struct ipoctal_channel *channel = tty->driver_data; speed_t baud; + tty->termios.c_cflag &= ~ADDRB; + cflag = tty->termios.c_cflag; /* Disable and reset everything before change the setup */ diff --git a/drivers/mmc/core/sdio_uart.c b/drivers/mmc/core/sdio_uart.c index 414aa82abc39..f28075952f3e 100644 --- a/drivers/mmc/core/sdio_uart.c +++ b/drivers/mmc/core/sdio_uart.c @@ -867,6 +867,8 @@ static void sdio_uart_set_termios(struct tty_struct *tty, if (sdio_uart_claim_func(port) != 0) return; + tty->termios.c_cflag &= ~ADDRB; + sdio_uart_change_speed(port, &tty->termios, old_termios); /* Handle transition to B0 status */ diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c index f8221a7acf62..056352618804 100644 --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -1099,7 +1099,8 @@ static void _hso_serial_set_termios(struct tty_struct *tty) ~(CSIZE /* no size */ | PARENB /* disable parity bit */ | CBAUD /* clear current baud rate */ - | CBAUDEX); /* clear current buad rate */ + | CBAUDEX /* clear current baud rate */ + | ADDRB); /* disable 9th (addr) bit */ tty->termios.c_cflag |= CS8; /* character size 8 bits */ diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c index 5c83f71c1d0e..253d2997a1d3 100644 --- a/drivers/s390/char/tty3270.c +++ b/drivers/s390/char/tty3270.c @@ -1768,6 +1768,9 @@ tty3270_set_termios(struct tty_struct *tty, struct ktermios *old) tp = tty->driver_data; if (!tp) return; + + tty->termios.c_cflag &= ~ADDRB; + spin_lock_bh(&tp->view.lock); if (L_ICANON(tty)) { new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN; diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c index dc4ed0ff1ae2..83e73aefde0f 100644 --- a/drivers/staging/greybus/uart.c +++ b/drivers/staging/greybus/uart.c @@ -487,6 +487,8 @@ static void gb_tty_set_termios(struct tty_struct *tty, struct ktermios *termios = &tty->termios; u8 newctrl = gb_tty->ctrlout; + termios->c_cflag &= ~ADDRB; + newline.rate = cpu_to_le32(tty_get_baud_rate(tty)); newline.format = termios->c_cflag & CSTOPB ? GB_SERIAL_2_STOP_BITS : GB_SERIAL_1_STOP_BITS; 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 6ebd3e4ed859..79c542aca1c3 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 82a1770dd808..0f397e67eeb0 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1540,6 +1540,8 @@ 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/synclink_gt.c b/drivers/tty/synclink_gt.c index 9bc2a9265277..180f38f0f57a 100644 --- a/drivers/tty/synclink_gt.c +++ b/drivers/tty/synclink_gt.c @@ -714,6 +714,8 @@ static void set_termios(struct tty_struct *tty, struct ktermios *old_termios) DBGINFO(("%s set_termios\n", tty->driver->name)); + tty->termios.c_cflag &= ~ADDRB; + change_params(info); /* Handle transition to B0 status */ 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/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 9b9aea24d58c..fd246ec70da8 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1056,6 +1056,8 @@ static void acm_tty_set_termios(struct tty_struct *tty, struct usb_cdc_line_coding newline; int newctrl = acm->ctrlout; + termios->c_cflag &= ~ADDRB; + newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty)); newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0; newline.bParityType = termios->c_cflag & PARENB ? diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 24101bd7fcad..8d1d170eb7e6 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -525,10 +525,12 @@ 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); + } } static int serial_break(struct tty_struct *tty, int break_state) diff --git a/include/uapi/asm-generic/termbits.h b/include/uapi/asm-generic/termbits.h index 2fbaf9ae89dd..e06eaa9cf8be 100644 --- a/include/uapi/asm-generic/termbits.h +++ b/include/uapi/asm-generic/termbits.h @@ -158,6 +158,7 @@ struct ktermios { #define B3500000 0010016 #define B4000000 0010017 #define CIBAUD 002003600000 /* input baud rate */ +#define ADDRB 004000000000 /* address bit */ #define CMSPAR 010000000000 /* mark or space (stick) parity */ #define CRTSCTS 020000000000 /* flow control */ diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c index ebd78fdbd6e8..832e725f23ab 100644 --- a/net/bluetooth/rfcomm/tty.c +++ b/net/bluetooth/rfcomm/tty.c @@ -871,6 +871,8 @@ static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old) if (!dev || !dev->dlc || !dev->dlc->session) return; + new->c_cflag &= ~ADDRB; + /* Handle turning off CRTSCTS */ if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS)) BT_DBG("Turning off CRTSCTS unsupported"); From patchwork Tue Apr 26 12:24:44 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: 12827023 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 1C35DC43219 for ; Tue, 26 Apr 2022 12:27:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349906AbiDZMa7 (ORCPT ); Tue, 26 Apr 2022 08:30:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33682 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346338AbiDZMan (ORCPT ); Tue, 26 Apr 2022 08:30:43 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 94D756949C; Tue, 26 Apr 2022 05:27:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1650976055; x=1682512055; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=992pMmMSIzYV7y0KEa3yv+K7RV9yrpGUXvIIXw6WJ3Q=; b=MJy89OV44ynfEKiOij8eFG+yHWCoqbe4B//aTNO7VMCfnIDE6u+Qma/K JEXommGtCRVTEE1L2pdHbJad4bLpvmQcaRNMwYU2vT1PMTb0lSdGaf/6J NfNZcNeuymP8ZRncpk4SXVCkn9lIT4QMO75zNimEcmk9LD3Vx6LSiXfzF jRAN0dl3Kjpie/lnlO2Ve3G5x6tS6ZjPDFNSKZrr5EGyKdRGerg2uszhs luhf1JwKS3AjnIrYXMDzTJTAJsYzTg1zyBAj0cRq+wKtPbmzbZSBD1/D1 t/qa2//aTMHqfOW6grc/rlQOGwF90VjFPIssiqUiNcW73VUJQs9stbbBf Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10328"; a="265365557" X-IronPort-AV: E=Sophos;i="5.90,290,1643702400"; d="scan'208";a="265365557" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Apr 2022 05:27:35 -0700 X-IronPort-AV: E=Sophos;i="5.90,290,1643702400"; d="scan'208";a="579864945" Received: from mmilkovx-mobl.amr.corp.intel.com (HELO ijarvine-MOBL2.ger.corp.intel.com) ([10.249.47.245]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Apr 2022 05:27:26 -0700 From: =?utf-8?q?Ilpo_J=C3=A4rvinen?= To: linux-serial@vger.kernel.org, Greg KH Cc: Jiri Slaby , Lukas Wunner , Andy Shevchenko , =?utf-8?q?Uwe_Kleine-K?= =?utf-8?q?=C3=B6nig?= , Vicente Bergas , Johan Hovold , heiko@sntech.de, giulio.benetti@micronovasrl.com, Heikki Krogerus , =?utf-8?q?Ilpo_J=C3=A4rv?= =?utf-8?q?inen?= , linux-api@vger.kernel.org, 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, Yoshinori Sato , Rich Felker , linux-sh@vger.kernel.org, "David S. Miller" , sparclinux@vger.kernel.org, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org, Arnd Bergmann , linux-arch@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v5 06/10] serial: General support for multipoint addresses Date: Tue, 26 Apr 2022 15:24:44 +0300 Message-Id: <20220426122448.38997-7-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220426122448.38997-1-ilpo.jarvinen@linux.intel.com> References: <20220426122448.38997-1-ilpo.jarvinen@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org Add generic support for serial multipoint addressing. Two new ioctls are added. TIOCSADDR is used to indicate the destination/receive address. TIOCGADDR returns the current address in use. The driver should implement set_addr and get_addr to support addressing mode. Adjust ADDRB clearing to happen only if driver does not provide set_addr (=the driver doesn't support address mode). This change is necessary for supporting devices with RS485 multipoint addressing [*]. A following 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 the previous patch. Transmit addresses / receiver filter are specified by setting the flags SER_ADDR_DEST and/or SER_ADDR_RECV. When the user supplies the transmit address, in the 9bit addressing mode it is sent out immediately with the 9th bit set to 1. After that, the subsequent normal data bytes are sent with 9th bit as 0 and they are intended to the device with the given address. It is up to receiver to enforce the filter using SER_ADDR_RECV. When userspace has supplied the receive address, the driver is expected to handle the matching of the address and only data with that address is forwarded to the user. Both SER_ADDR_DEST and SER_ADDR_RECV can be given at the same time in a single call if the addresses are the same. The user can clear the receive filter with SER_ADDR_RECV_CLEAR. [*] 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: 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: Yoshinori Sato Cc: Rich Felker Cc: linux-sh@vger.kernel.org Cc: "David S. Miller" Cc: sparclinux@vger.kernel.org Cc: Chris Zankel Cc: Max Filippov Cc: linux-xtensa@linux-xtensa.org Cc: Arnd Bergmann Cc: linux-arch@vger.kernel.org Cc: linux-doc@vger.kernel.org Signed-off-by: Ilpo Järvinen --- .../driver-api/serial/serial-rs485.rst | 23 ++++++- arch/alpha/include/uapi/asm/ioctls.h | 3 + arch/mips/include/uapi/asm/ioctls.h | 3 + arch/parisc/include/uapi/asm/ioctls.h | 3 + arch/powerpc/include/uapi/asm/ioctls.h | 3 + arch/sh/include/uapi/asm/ioctls.h | 3 + arch/sparc/include/uapi/asm/ioctls.h | 3 + arch/xtensa/include/uapi/asm/ioctls.h | 3 + drivers/tty/serial/8250/8250_core.c | 2 + drivers/tty/serial/serial_core.c | 62 ++++++++++++++++++- drivers/tty/tty_io.c | 2 + include/linux/serial_core.h | 6 ++ include/uapi/asm-generic/ioctls.h | 3 + include/uapi/linux/serial.h | 8 +++ 14 files changed, 125 insertions(+), 2 deletions(-) diff --git a/Documentation/driver-api/serial/serial-rs485.rst b/Documentation/driver-api/serial/serial-rs485.rst index 6bc824f948f9..2f45f007fa5b 100644 --- a/Documentation/driver-api/serial/serial-rs485.rst +++ b/Documentation/driver-api/serial/serial-rs485.rst @@ -95,7 +95,28 @@ RS485 Serial Communications /* Error handling. See errno. */ } -5. References +5. Multipoint Addressing +======================== + + The Linux kernel provides serial_addr structure to handle addressing within + multipoint serial communications line such as RS485. 9th bit addressiong mode + is enabled by adding ADDRB flag in termios c_cflag. + + Serial core calls device specific set/get_addr in response to TIOCSADDR and + TIOCGADDR ioctls with a pointer to serial_addr. Destination and receive + address can be specified using serial_addr flags field. Receive address may + also be cleared using flags. Once an address is set, the communication + can occur only with the particular device and other peers are filtered out. + It is left up to the receiver side to enforce the filtering. + + Address flags: + - SER_ADDR_RECV: Receive (filter) address. + - SER_ADDR_RECV_CLEAR: Clear receive filter (only for TIOCSADDR). + - SER_ADDR_DEST: Destination address. + + Note: not all devices supporting RS485 support multipoint addressing. + +6. References ============= [1] include/uapi/linux/serial.h diff --git a/arch/alpha/include/uapi/asm/ioctls.h b/arch/alpha/include/uapi/asm/ioctls.h index 971311605288..500cab3e1d6b 100644 --- a/arch/alpha/include/uapi/asm/ioctls.h +++ b/arch/alpha/include/uapi/asm/ioctls.h @@ -125,4 +125,7 @@ #define TIOCMIWAIT 0x545C /* wait for a change on serial input line(s) */ #define TIOCGICOUNT 0x545D /* read serial port inline interrupt counts */ +#define TIOCSADDR _IOWR('T', 0x63, struct serial_addr) +#define TIOCGADDR _IOWR('T', 0x64, struct serial_addr) + #endif /* _ASM_ALPHA_IOCTLS_H */ diff --git a/arch/mips/include/uapi/asm/ioctls.h b/arch/mips/include/uapi/asm/ioctls.h index 16aa8a766aec..3859dc46857e 100644 --- a/arch/mips/include/uapi/asm/ioctls.h +++ b/arch/mips/include/uapi/asm/ioctls.h @@ -96,6 +96,9 @@ #define TIOCGISO7816 _IOR('T', 0x42, struct serial_iso7816) #define TIOCSISO7816 _IOWR('T', 0x43, struct serial_iso7816) +#define TIOCSADDR _IOWR('T', 0x63, struct serial_addr) +#define TIOCGADDR _IOWR('T', 0x64, struct serial_addr) + /* I hope the range from 0x5480 on is free ... */ #define TIOCSCTTY 0x5480 /* become controlling tty */ #define TIOCGSOFTCAR 0x5481 diff --git a/arch/parisc/include/uapi/asm/ioctls.h b/arch/parisc/include/uapi/asm/ioctls.h index 82d1148c6379..62337743db64 100644 --- a/arch/parisc/include/uapi/asm/ioctls.h +++ b/arch/parisc/include/uapi/asm/ioctls.h @@ -86,6 +86,9 @@ #define TIOCSTOP 0x5462 #define TIOCSLTC 0x5462 +#define TIOCSADDR _IOWR('T', 0x63, struct serial_addr) +#define TIOCGADDR _IOWR('T', 0x64, struct serial_addr) + /* Used for packet mode */ #define TIOCPKT_DATA 0 #define TIOCPKT_FLUSHREAD 1 diff --git a/arch/powerpc/include/uapi/asm/ioctls.h b/arch/powerpc/include/uapi/asm/ioctls.h index 2c145da3b774..84fd69ac366a 100644 --- a/arch/powerpc/include/uapi/asm/ioctls.h +++ b/arch/powerpc/include/uapi/asm/ioctls.h @@ -120,4 +120,7 @@ #define TIOCMIWAIT 0x545C /* wait for a change on serial input line(s) */ #define TIOCGICOUNT 0x545D /* read serial port inline interrupt counts */ +#define TIOCSADDR _IOWR('T', 0x63, struct serial_addr) +#define TIOCGADDR _IOWR('T', 0x64, struct serial_addr) + #endif /* _ASM_POWERPC_IOCTLS_H */ diff --git a/arch/sh/include/uapi/asm/ioctls.h b/arch/sh/include/uapi/asm/ioctls.h index 11866d4f60e1..f82966b7dba2 100644 --- a/arch/sh/include/uapi/asm/ioctls.h +++ b/arch/sh/include/uapi/asm/ioctls.h @@ -113,4 +113,7 @@ #define TIOCMIWAIT _IO('T', 92) /* 0x545C */ /* wait for a change on serial input line(s) */ #define TIOCGICOUNT 0x545D /* read serial port inline interrupt counts */ +#define TIOCSADDR _IOWR('T', 0x63, struct serial_addr) +#define TIOCGADDR _IOWR('T', 0x64, struct serial_addr) + #endif /* __ASM_SH_IOCTLS_H */ diff --git a/arch/sparc/include/uapi/asm/ioctls.h b/arch/sparc/include/uapi/asm/ioctls.h index 7fd2f5873c9e..e44624c67c79 100644 --- a/arch/sparc/include/uapi/asm/ioctls.h +++ b/arch/sparc/include/uapi/asm/ioctls.h @@ -125,6 +125,9 @@ #define TIOCMIWAIT 0x545C /* Wait for change on serial input line(s) */ #define TIOCGICOUNT 0x545D /* Read serial port inline interrupt counts */ +#define TIOCSADDR _IOWR('T', 0x63, struct serial_addr) +#define TIOCGADDR _IOWR('T', 0x64, struct serial_addr) + /* Kernel definitions */ /* Used for packet mode */ diff --git a/arch/xtensa/include/uapi/asm/ioctls.h b/arch/xtensa/include/uapi/asm/ioctls.h index 6d4a87296c95..759ca9377f2a 100644 --- a/arch/xtensa/include/uapi/asm/ioctls.h +++ b/arch/xtensa/include/uapi/asm/ioctls.h @@ -127,4 +127,7 @@ #define TIOCMIWAIT _IO('T', 92) /* wait for a change on serial input line(s) */ #define TIOCGICOUNT 0x545D /* read serial port inline interrupt counts */ +#define TIOCSADDR _IOWR('T', 0x63, struct serial_addr) +#define TIOCGADDR _IOWR('T', 0x64, struct serial_addr) + #endif /* _XTENSA_IOCTLS_H */ diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 01d30f6ed8fb..f67bc3b76f65 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -1008,6 +1008,8 @@ int serial8250_register_8250_port(const struct uart_8250_port *up) uart->port.rs485 = up->port.rs485; uart->rs485_start_tx = up->rs485_start_tx; uart->rs485_stop_tx = up->rs485_stop_tx; + uart->port.set_addr = up->port.set_addr; + uart->port.get_addr = up->port.get_addr; uart->dma = up->dma; /* Take tx_loadsz from fifosize if it wasn't set separately */ diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 0f397e67eeb0..5762987bf176 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1397,6 +1397,56 @@ static int uart_set_iso7816_config(struct uart_port *port, return 0; } +static int uart_set_addr(struct uart_port *port, + struct serial_addr __user *serial_addr_user) +{ + struct serial_addr addr; + unsigned long flags; + int ret; + + if (!port->set_addr) + return -ENOTTY; + + if (copy_from_user(&addr, serial_addr_user, sizeof(*serial_addr_user))) + return -EFAULT; + + spin_lock_irqsave(&port->lock, flags); + ret = port->set_addr(port, &addr); + spin_unlock_irqrestore(&port->lock, flags); + if (ret) + return ret; + + if (copy_to_user(serial_addr_user, &addr, sizeof(addr))) + return -EFAULT; + + return 0; +} + +static int uart_get_addr(struct uart_port *port, + struct serial_addr __user *serial_addr_user) +{ + struct serial_addr addr; + unsigned long flags; + int ret; + + if (!port->get_addr) + return -ENOTTY; + + if (copy_from_user(&addr, serial_addr_user, sizeof(*serial_addr_user))) + return -EFAULT; + + spin_lock_irqsave(&port->lock, flags); + ret = port->get_addr(port, &addr); + spin_unlock_irqrestore(&port->lock, flags); + if (ret) + return ret; + + if (copy_to_user(serial_addr_user, &addr, sizeof(addr))) + return -EFAULT; + + return 0; +} + /* * Called via sys_ioctl. We can use spin_lock_irq() here. */ @@ -1474,6 +1524,15 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) case TIOCGISO7816: ret = uart_get_iso7816_config(state->uart_port, uarg); break; + + case TIOCSADDR: + ret = uart_set_addr(uport, uarg); + break; + + case TIOCGADDR: + ret = uart_get_addr(uport, uarg); + break; + default: if (uport->ops->ioctl) ret = uport->ops->ioctl(uport, cmd, arg); @@ -1540,7 +1599,8 @@ static void uart_set_termios(struct tty_struct *tty, goto out; } - tty->termios.c_cflag &= ~ADDRB; + if (!uport->set_addr) + tty->termios.c_cflag &= ~ADDRB; uart_change_speed(tty, state, old_termios); /* reload cflag from termios; port driver may have overridden flags */ diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 8fec1d8648f5..ef22b95e9c79 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -2885,6 +2885,8 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd, case TIOCSERGETLSR: case TIOCGRS485: case TIOCSRS485: + case TIOCSADDR: + case TIOCGADDR: #ifdef TIOCGETP case TIOCGETP: case TIOCSETP: diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index cbd5070bc87f..2dd4c4d01c59 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -135,6 +135,12 @@ struct uart_port { struct serial_rs485 *rs485); int (*iso7816_config)(struct uart_port *, struct serial_iso7816 *iso7816); + + int (*set_addr)(struct uart_port *p, + struct serial_addr *addr); + int (*get_addr)(struct uart_port *p, + struct serial_addr *addr); + unsigned int irq; /* irq number */ unsigned long irqflags; /* irq flags */ unsigned int uartclk; /* base uart clock */ diff --git a/include/uapi/asm-generic/ioctls.h b/include/uapi/asm-generic/ioctls.h index cdc9f4ca8c27..689743366091 100644 --- a/include/uapi/asm-generic/ioctls.h +++ b/include/uapi/asm-generic/ioctls.h @@ -106,6 +106,9 @@ # define FIOQSIZE 0x5460 #endif +#define TIOCSADDR _IOWR('T', 0x63, struct serial_addr) +#define TIOCGADDR _IOWR('T', 0x64, struct serial_addr) + /* Used for packet mode */ #define TIOCPKT_DATA 0 #define TIOCPKT_FLUSHREAD 1 diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h index fa6b16e5fdd8..8cb785ea7087 100644 --- a/include/uapi/linux/serial.h +++ b/include/uapi/linux/serial.h @@ -149,4 +149,12 @@ struct serial_iso7816 { __u32 reserved[5]; }; +struct serial_addr { + __u32 flags; +#define SER_ADDR_RECV (1 << 0) +#define SER_ADDR_RECV_CLEAR (1 << 1) +#define SER_ADDR_DEST (1 << 2) + __u32 addr; +}; + #endif /* _UAPI_LINUX_SERIAL_H */