From patchwork Wed Apr 3 06:26:29 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Ji-Ze Hong (Peter Hong)" X-Patchwork-Id: 10882879 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DB6DF1390 for ; Wed, 3 Apr 2019 06:26:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C508128986 for ; Wed, 3 Apr 2019 06:26:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B8E05289B5; Wed, 3 Apr 2019 06:26:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2CC0528986 for ; Wed, 3 Apr 2019 06:26:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726882AbfDCG0o (ORCPT ); Wed, 3 Apr 2019 02:26:44 -0400 Received: from mail-pl1-f195.google.com ([209.85.214.195]:46142 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725879AbfDCG0n (ORCPT ); Wed, 3 Apr 2019 02:26:43 -0400 Received: by mail-pl1-f195.google.com with SMTP id y6so7502657pll.13; Tue, 02 Apr 2019 23:26:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=KpyUlTtCPDXPCptqsdtE2VC4bY/0TzrOm6bvZ79h+y4=; b=ETU39y/J8MMSySgKFMh5VrbxH4tiw0K27HW92Nj9FLuwuPK8tu6NbVwWplHwxxQf6W 0t7ngUxMTKLDHxz139pdxkHUyKGCr//rPgF7KcftnhZsdF6YnrzxLA/3V8iBPhqFk3vB hdFI7UCIAEAy4w5EBJAMH8BBiDWlcls6yAwXtHKhm92mdQ63PwEhqbEoB9iDt4EPNgKg TPGwizd9LTIKM0UyjZog64JLAobI+SKSE7DKKCGuoTdF/lQDYg31t8qaVudscbUttqo1 49ilgaE6Jq21m4DSdapz0QmNWEVjZjACGas45EA/KL9WYmBHGju4w17T15op9bi8mNvJ 1qiw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=KpyUlTtCPDXPCptqsdtE2VC4bY/0TzrOm6bvZ79h+y4=; b=Gb0MIzVvsUCTBXW72C3CQ3y2KGrCsCLq0NmJbJfF8kGPsvEG9j0YUiIR/D68tOYgeD puUbH83w/FABbDEb3wRCTr+IY1DXNQ39x2fyKjc4Nscjz/926sTRWarRkgwOO23GFPKH O9QgOPE/GU9DqiUOGBxJ/RCmopyHiKD7YDH8otUe6UDAnCE0Jrjt5D3g+otg98uikm78 UWTKMxaYzsNqA4CaOqiANlw98o73M1A9dV6xhneCp7g+Ubo+W4QaOhpXa1x08wr2mG16 OTlBLc3JDBGNTcJgK3G8T/cQ4Bca4DNX86qlWMR5RY1GMwMdmzEB8bmffdu9bBwDHXjq er0w== X-Gm-Message-State: APjAAAUWN/onfWeqTGVajODgh5MFdqL/f8FvEfgLOEgazTtvNna9oZLw kK8iD9qtwRXetQYRATd42Lo= X-Google-Smtp-Source: APXvYqxydML28zvXij3H1chQ14BR3qZ2dBUhO6S+qQxSa+Oi6Ih0IDithvdwlyOk/Zv/8uGy1VCdmg== X-Received: by 2002:a17:902:8643:: with SMTP id y3mr7274587plt.187.1554272802366; Tue, 02 Apr 2019 23:26:42 -0700 (PDT) Received: from localhost (59-120-186-245.HINET-IP.hinet.net. [59.120.186.245]) by smtp.gmail.com with ESMTPSA id g64sm35035003pfg.13.2019.04.02.23.26.41 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 02 Apr 2019 23:26:41 -0700 (PDT) From: "Ji-Ze Hong (Peter Hong)" X-Google-Original-From: "Ji-Ze Hong (Peter Hong)" To: peter_hong@fintek.com.tw, johan@kernel.org, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, "Ji-Ze Hong (Peter Hong)" Subject: [PATCH V5 2/3] USB: serial: f81232: add high baud rate support Date: Wed, 3 Apr 2019 14:26:29 +0800 Message-Id: <1554272790-26747-2-git-send-email-hpeter+linux_kernel@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1554272790-26747-1-git-send-email-hpeter+linux_kernel@gmail.com> References: <1554272790-26747-1-git-send-email-hpeter+linux_kernel@gmail.com> Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The F81232 had 4 clocksource 1.846/18.46/14.77/24MHz and baud rates can be up to 1.5Mbits with 24MHz. F81232 Clock registers (106h) Bit1-0: Clock source selector 00: 1.846MHz. 01: 18.46MHz. 10: 24MHz. 11: 14.77MHz. Signed-off-by: Ji-Ze Hong (Peter Hong) --- v5: 1: no change v4: 1: no change v3: 1: change the baud_base in f81232_get_serial_info() drivers/usb/serial/f81232.c | 105 +++++++++++++++++++++++++++++++++++++++----- 1 file changed, 94 insertions(+), 11 deletions(-) diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index d8a0bb7a41f0..32eff8fad56a 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -28,7 +28,8 @@ static const struct usb_device_id id_table[] = { MODULE_DEVICE_TABLE(usb, id_table); /* Maximum baudrate for F81232 */ -#define F81232_MAX_BAUDRATE 115200 +#define F81232_MAX_BAUDRATE 1500000 +#define F81232_DEF_BAUDRATE 9600 /* USB Control EP parameter */ #define F81232_REGISTER_REQUEST 0xa0 @@ -44,18 +45,42 @@ MODULE_DEVICE_TABLE(usb, id_table); #define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS) #define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS) +/* + * F81232 Clock registers (106h) + * + * Bit1-0: Clock source selector + * 00: 1.846MHz. + * 01: 18.46MHz. + * 10: 24MHz. + * 11: 14.77MHz. + */ +#define F81232_CLK_REGISTER 0x106 +#define F81232_CLK_1_846_MHZ 0 +#define F81232_CLK_18_46_MHZ BIT(0) +#define F81232_CLK_24_MHZ BIT(1) +#define F81232_CLK_14_77_MHZ (BIT(1) | BIT(0)) +#define F81232_CLK_MASK GENMASK(1, 0) + struct f81232_private { struct mutex lock; u8 modem_control; u8 modem_status; + speed_t baud_base; struct work_struct lsr_work; struct work_struct interrupt_work; struct usb_serial_port *port; }; -static int calc_baud_divisor(speed_t baudrate) +static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 }; +static u8 const clock_table[] = { F81232_CLK_1_846_MHZ, F81232_CLK_14_77_MHZ, + F81232_CLK_18_46_MHZ, F81232_CLK_24_MHZ }; + +static int calc_baud_divisor(speed_t baudrate, speed_t clockrate) { - return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate); + if (!baudrate) + return 0; + + return DIV_ROUND_CLOSEST(clockrate, baudrate); } static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val) @@ -129,6 +154,21 @@ static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val) return status; } +static int f81232_set_mask_register(struct usb_serial_port *port, u16 reg, + u8 mask, u8 val) +{ + int status; + u8 tmp; + + status = f81232_get_register(port, reg, &tmp); + if (status) + return status; + + tmp = (tmp & ~mask) | (val & mask); + + return f81232_set_register(port, reg, tmp); +} + static void f81232_read_msr(struct usb_serial_port *port) { int status; @@ -349,13 +389,53 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state) */ } -static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate) +static int f81232_find_clk(speed_t baudrate) +{ + int idx; + + for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) { + if (baudrate <= baudrate_table[idx] && + baudrate_table[idx] % baudrate == 0) + return idx; + } + + return -EINVAL; +} + +static void f81232_set_baudrate(struct tty_struct *tty, + struct usb_serial_port *port, speed_t baudrate, + speed_t old_baudrate) { + struct f81232_private *priv = usb_get_serial_port_data(port); u8 lcr; int divisor; int status = 0; + int i; + int idx; + speed_t baud_list[] = {baudrate, old_baudrate, F81232_DEF_BAUDRATE}; + + for (i = 0; i < ARRAY_SIZE(baud_list); ++i) { + idx = f81232_find_clk(baud_list[i]); + if (idx >= 0) { + baudrate = baud_list[i]; + tty_encode_baud_rate(tty, baudrate, baudrate); + break; + } + } - divisor = calc_baud_divisor(baudrate); + if (idx < 0) + return; + + priv->baud_base = baudrate_table[idx]; + divisor = calc_baud_divisor(baudrate, priv->baud_base); + + status = f81232_set_mask_register(port, F81232_CLK_REGISTER, + F81232_CLK_MASK, clock_table[idx]); + if (status) { + dev_err(&port->dev, "%s failed to set CLK_REG: %d\n", + __func__, status); + return; + } status = f81232_get_register(port, LINE_CONTROL_REGISTER, &lcr); /* get LCR */ @@ -445,6 +525,7 @@ static void f81232_set_termios(struct tty_struct *tty, u8 new_lcr = 0; int status = 0; speed_t baudrate; + speed_t old_baud; /* Don't change anything if nothing has changed */ if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) @@ -457,11 +538,12 @@ static void f81232_set_termios(struct tty_struct *tty, baudrate = tty_get_baud_rate(tty); if (baudrate > 0) { - if (baudrate > F81232_MAX_BAUDRATE) { - baudrate = F81232_MAX_BAUDRATE; - tty_encode_baud_rate(tty, baudrate, baudrate); - } - f81232_set_baudrate(port, baudrate); + if (old_termios) + old_baud = tty_termios_baud_rate(old_termios); + else + old_baud = F81232_DEF_BAUDRATE; + + f81232_set_baudrate(tty, port, baudrate, old_baud); } if (C_PARENB(tty)) { @@ -597,11 +679,12 @@ static int f81232_get_serial_info(struct tty_struct *tty, struct serial_struct *ss) { struct usb_serial_port *port = tty->driver_data; + struct f81232_private *priv = usb_get_serial_port_data(port); ss->type = PORT_16550A; ss->line = port->minor; ss->port = port->port_number; - ss->baud_base = F81232_MAX_BAUDRATE; + ss->baud_base = priv->baud_base; return 0; }