From patchwork Fri Jun 17 12:41:11 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 9183873 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5E3C3601C0 for ; Fri, 17 Jun 2016 12:42:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4A26728388 for ; Fri, 17 Jun 2016 12:42:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3EC4E2839F; Fri, 17 Jun 2016 12:42:42 +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=-6.9 required=2.0 tests=BAYES_00,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 D1F3028388 for ; Fri, 17 Jun 2016 12:42:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964775AbcFQMml (ORCPT ); Fri, 17 Jun 2016 08:42:41 -0400 Received: from mga03.intel.com ([134.134.136.65]:11086 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161183AbcFQMlV (ORCPT ); Fri, 17 Jun 2016 08:41:21 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga103.jf.intel.com with ESMTP; 17 Jun 2016 05:41:20 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,483,1459839600"; d="scan'208";a="989799355" Received: from black.fi.intel.com ([10.237.72.93]) by fmsmga001.fm.intel.com with ESMTP; 17 Jun 2016 05:41:18 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id E6C03DC2; Fri, 17 Jun 2016 15:41:11 +0300 (EEST) From: Andy Shevchenko To: Bryan O'Donoghue , Peter Hurley , linux-serial@vger.kernel.org, Vinod Koul , linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, Greg Kroah-Hartman , ismo.puustinen@intel.com, Heikki Krogerus Cc: Andy Shevchenko Subject: [PATCH v7 11/11] serial: 8250_lpss: enable DMA on Intel Quark UART Date: Fri, 17 Jun 2016 15:41:11 +0300 Message-Id: <1466167271-11902-12-git-send-email-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1466167271-11902-1-git-send-email-andriy.shevchenko@linux.intel.com> References: <1466167271-11902-1-git-send-email-andriy.shevchenko@linux.intel.com> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP DMA on Intel Quark SoC is a part of UART IP block. Enable it. Signed-off-by: Andy Shevchenko --- drivers/tty/serial/8250/8250_lpss.c | 84 +++++++++++++++++++++++++++++++++++-- 1 file changed, 80 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c index 5ac291c..1b464cd 100644 --- a/drivers/tty/serial/8250/8250_lpss.c +++ b/drivers/tty/serial/8250/8250_lpss.c @@ -15,7 +15,7 @@ #include #include -#include +#include #include "8250.h" @@ -47,6 +47,7 @@ struct lpss8250_board { unsigned long freq; unsigned int base_baud; int (*setup)(struct lpss8250 *, struct uart_port *p); + void (*exit)(struct lpss8250 *); }; struct lpss8250 { @@ -55,6 +56,7 @@ struct lpss8250 { /* DMA parameters */ struct uart_8250_dma dma; + struct dw_dma_chip dma_chip; struct dw_dma_slave dma_param; u8 dma_maxburst; }; @@ -151,6 +153,66 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port) return 0; } +#ifdef CONFIG_SERIAL_8250_DMA +static const struct dw_dma_platform_data qrk_serial_dma_pdata = { + .nr_channels = 2, + .is_private = true, + .is_nollp = true, + .chan_allocation_order = CHAN_ALLOCATION_ASCENDING, + .chan_priority = CHAN_PRIORITY_ASCENDING, + .block_size = 4095, + .nr_masters = 1, + .data_width = {4}, +}; + +static int qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port) +{ + struct uart_8250_dma *dma = &lpss->dma; + struct dw_dma_chip *chip = &lpss->dma_chip; + struct dw_dma_slave *param = &lpss->dma_param; + struct pci_dev *pdev = to_pci_dev(port->dev); + int ret; + + chip->dev = &pdev->dev; + chip->irq = pdev->irq; + chip->regs = pci_ioremap_bar(pdev, 1); + chip->pdata = &qrk_serial_dma_pdata; + + /* Falling back to PIO mode if DMA probing fails */ + ret = dw_dma_probe(chip); + if (ret) + return 0; + + /* Special DMA address for UART */ + dma->rx_dma_addr = 0xfffff000; + dma->tx_dma_addr = 0xfffff000; + + param->dma_dev = &pdev->dev; + param->src_id = 0; + param->dst_id = 1; + param->hs_polarity = true; + + lpss->dma_maxburst = 8; + return 0; +} + +static void qrk_serial_exit_dma(struct lpss8250 *lpss) +{ + qrk_serial_exit_dma(lpss); + struct dw_dma_slave *param = &lpss->dma_param; + + if (!param->dma_dev) + return; + dw_dma_remove(&lpss->dma_chip); +} +#else /* CONFIG_SERIAL_8250_DMA */ +static int qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port) +{ + return 0; +} +static void qrk_serial_exit_dma(struct lpss8250 *lpss) {} +#endif /* !CONFIG_SERIAL_8250_DMA */ + static int qrk_serial_setup(struct lpss8250 *lpss, struct uart_port *port) { struct pci_dev *pdev = to_pci_dev(port->dev); @@ -159,7 +221,12 @@ static int qrk_serial_setup(struct lpss8250 *lpss, struct uart_port *port) port->irq = pdev->irq; - return 0; + return qrk_serial_setup_dma(lpss, port); +} + +static void qrk_serial_exit(struct lpss8250 *lpss) +{ + qrk_serial_exit_dma(lpss); } static bool lpss8250_dma_filter(struct dma_chan *chan, void *param) @@ -244,22 +311,30 @@ static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id) ret = lpss8250_dma_setup(lpss, &uart); if (ret) - return ret; + goto err_exit; ret = serial8250_register_8250_port(&uart); if (ret < 0) - return ret; + goto err_exit; lpss->line = ret; pci_set_drvdata(pdev, lpss); return 0; + +err_exit: + if (lpss->board->exit) + lpss->board->exit(lpss); + return ret; } static void lpss8250_remove(struct pci_dev *pdev) { struct lpss8250 *lpss = pci_get_drvdata(pdev); + if (lpss->board->exit) + lpss->board->exit(lpss); + serial8250_unregister_port(lpss->line); } @@ -273,6 +348,7 @@ static const struct lpss8250_board qrk_board = { .freq = 44236800, .base_baud = 2764800, .setup = qrk_serial_setup, + .exit = qrk_serial_exit, }; #define LPSS_DEVICE(id, board) { PCI_VDEVICE(INTEL, id), (kernel_ulong_t)&board }