From patchwork Fri Dec 16 05:26:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kumaravel Thiagarajan X-Patchwork-Id: 634788 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 01653C4167B for ; Thu, 15 Dec 2022 16:53:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230356AbiLOQxW (ORCPT ); Thu, 15 Dec 2022 11:53:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45184 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230316AbiLOQwo (ORCPT ); Thu, 15 Dec 2022 11:52:44 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4342337F94; Thu, 15 Dec 2022 08:52:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1671123164; x=1702659164; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7c9jSwU2YvZekx3KGxksBJgmGj8DCsp74IgYm7As1Is=; b=oQcI8knJ4brcIcH+hsirgTXdccia2npEU81OKxT4nGazu3/say1bAQuT PJFzxBp0BtMkOB0XkgR1MEru2L0bnBqD0B0lXiZ20FpgRWIZ2gjUgMHsa psETnH9qcI58Lb8Froi2vpa7SzCFjlxZIuYaLUwwzrd8p/F3iG8lyDJZi k30VUAhK5Him3gVngKnPfB7PTfcqQ/bnQgKDh1c4U9R8DCJZmn42Jyv1i Iz8TM9zBMToangvJ2tJMZoyk/AGd/H3ax37jbzROTn1l+08n2w+3YWGNX +vyqhQkzx1kZ61/iFxsuYj8UHuAimtke/PSai9ZWaXWWiOwF1S76W4ToT w==; X-IronPort-AV: E=Sophos;i="5.96,248,1665471600"; d="scan'208";a="193245156" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa5.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 15 Dec 2022 09:52:43 -0700 Received: from chn-vm-ex01.mchp-main.com (10.10.85.143) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Thu, 15 Dec 2022 09:52:42 -0700 Received: from CHE-LT-UNGSOFTWARE.microchip.com (10.10.115.15) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Thu, 15 Dec 2022 09:52:36 -0700 From: Kumaravel Thiagarajan To: CC: , , , , , , , , , , , , , , , , , Tharun Kumar P Subject: [PATCH v9 tty-next 4/4] serial: 8250_pci1xxxx: Add power management functions to quad-uart driver Date: Fri, 16 Dec 2022 10:56:56 +0530 Message-ID: <20221216052656.2098100-5-kumaravel.thiagarajan@microchip.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221216052656.2098100-1-kumaravel.thiagarajan@microchip.com> References: <20221216052656.2098100-1-kumaravel.thiagarajan@microchip.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org pci1xxxx's quad-uart function has the capability to wake up UART from suspend state. Enable wakeup before entering into suspend and disable wakeup on resume. Co-developed-by: Tharun Kumar P Signed-off-by: Tharun Kumar P Signed-off-by: Kumaravel Thiagarajan --- Changes in v9: - No Change Changes in v8: - No Change Changes in v7: - No Change Changes in v6: - No Change Changes in v5: - Corrected commit message Changes in v4: - No Change Changes in v3: - Handled race condition in suspend and resume callbacks Changes in v2: - Use DEFINE_SIMPLE_DEV_PM_OPS instead of SIMPLE_DEV_PM_OPS. - Use pm_sleep_ptr instead of CONFIG_PM_SLEEP. - Change the return data type of pci1xxxx_port_suspend to bool from int. --- drivers/tty/serial/8250/8250_pci1xxxx.c | 115 ++++++++++++++++++++++++ 1 file changed, 115 insertions(+) diff --git a/drivers/tty/serial/8250/8250_pci1xxxx.c b/drivers/tty/serial/8250/8250_pci1xxxx.c index e46c6b835a36..31790c8b6087 100644 --- a/drivers/tty/serial/8250/8250_pci1xxxx.c +++ b/drivers/tty/serial/8250/8250_pci1xxxx.c @@ -211,6 +211,116 @@ static const struct serial_rs485 pci1xxxx_rs485_supported = { /* Delay RTS before send is not supported */ }; +static bool pci1xxxx_port_suspend(int line) +{ + struct uart_8250_port *up = serial8250_get_port(line); + struct uart_port *port = &up->port; + struct tty_port *tport = &port->state->port; + unsigned long flags; + bool ret = false; + u8 wakeup_mask; + + mutex_lock(&tport->mutex); + if (port->suspended == 0 && port->dev) { + wakeup_mask = readb(up->port.membase + UART_WAKE_MASK_REG); + + spin_lock_irqsave(&port->lock, flags); + port->mctrl &= ~TIOCM_OUT2; + port->ops->set_mctrl(port, port->mctrl); + spin_unlock_irqrestore(&port->lock, flags); + + ret = (wakeup_mask & UART_WAKE_SRCS) != UART_WAKE_SRCS; + } + + writeb(UART_WAKE_SRCS, port->membase + UART_WAKE_REG); + mutex_unlock(&tport->mutex); + + return ret; +} + +static void pci1xxxx_port_resume(int line) +{ + struct uart_8250_port *up = serial8250_get_port(line); + struct uart_port *port = &up->port; + struct tty_port *tport = &port->state->port; + unsigned long flags; + + mutex_lock(&tport->mutex); + writeb(UART_BLOCK_SET_ACTIVE, port->membase + UART_ACTV_REG); + writeb(UART_WAKE_SRCS, port->membase + UART_WAKE_REG); + + if (port->suspended == 0) { + spin_lock_irqsave(&port->lock, flags); + port->mctrl |= TIOCM_OUT2; + port->ops->set_mctrl(port, port->mctrl); + spin_unlock_irqrestore(&port->lock, flags); + } + mutex_unlock(&tport->mutex); +} + +static int pci1xxxx_suspend(struct device *dev) +{ + struct pci1xxxx_8250 *priv = dev_get_drvdata(dev); + struct pci_dev *pcidev = to_pci_dev(dev); + bool wakeup = false; + unsigned int data; + void __iomem *p; + int i; + + for (i = 0; i < priv->nr; i++) { + if (priv->line[i] >= 0) { + serial8250_suspend_port(priv->line[i]); + wakeup |= pci1xxxx_port_suspend(priv->line[i]); + } + } + + p = pci_ioremap_bar(pcidev, 0); + if (!p) { + dev_err(dev, "remapping of bar 0 memory failed"); + return -ENOMEM; + } + + data = readl(p + UART_RESET_REG); + writel(data | UART_RESET_D3_RESET_DISABLE, p + UART_RESET_REG); + + if (wakeup) + writeb(UART_PCI_CTRL_D3_CLK_ENABLE, p + UART_PCI_CTRL_REG); + + iounmap(p); + device_set_wakeup_enable(dev, true); + pci_wake_from_d3(pcidev, true); + + return 0; +} + +static int pci1xxxx_resume(struct device *dev) +{ + struct pci1xxxx_8250 *priv = dev_get_drvdata(dev); + struct pci_dev *pcidev = to_pci_dev(dev); + unsigned int data; + void __iomem *p; + int i; + + p = pci_ioremap_bar(pcidev, 0); + if (!p) { + dev_err(dev, "remapping of bar 0 memory failed"); + return -ENOMEM; + } + + data = readl(p + UART_RESET_REG); + writel(data & ~UART_RESET_D3_RESET_DISABLE, p + UART_RESET_REG); + iounmap(p); + + for (i = 0; i < priv->nr; i++) { + if (priv->line[i] >= 0) { + pci1xxxx_port_resume(priv->line[i]); + serial8250_resume_port(priv->line[i]); + } + } + + return 0; +} + static int pci1xxxx_setup(struct pci_dev *pdev, struct uart_8250_port *port, int port_idx) { @@ -350,6 +460,8 @@ static void pci1xxxx_serial_remove(struct pci_dev *dev) pci_iounmap(dev, priv->membase); } +static DEFINE_SIMPLE_DEV_PM_OPS(pci1xxxx_pm_ops, pci1xxxx_suspend, pci1xxxx_resume); + static const struct pci_device_id pci1xxxx_pci_tbl[] = { { PCI_VDEVICE(EFAR, PCI_DEVICE_ID_EFAR_PCI11010) }, { PCI_VDEVICE(EFAR, PCI_DEVICE_ID_EFAR_PCI11101) }, @@ -364,6 +476,9 @@ static struct pci_driver pci1xxxx_pci_driver = { .name = "pci1xxxx serial", .probe = pci1xxxx_serial_probe, .remove = pci1xxxx_serial_remove, + .driver = { + .pm = pm_sleep_ptr(&pci1xxxx_pm_ops), + }, .id_table = pci1xxxx_pci_tbl, }; module_pci_driver(pci1xxxx_pci_driver);