From patchwork Thu May 16 11:47:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurentiu Tudor X-Patchwork-Id: 10946445 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 87E0E924 for ; Thu, 16 May 2019 11:50:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 72C63212DA for ; Thu, 16 May 2019 11:50:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 66590280CF; Thu, 16 May 2019 11:50:13 +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=-7.9 required=2.0 tests=BAYES_00,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 E02E3212DA for ; Thu, 16 May 2019 11:50:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727808AbfEPLt6 (ORCPT ); Thu, 16 May 2019 07:49:58 -0400 Received: from inva021.nxp.com ([92.121.34.21]:44390 "EHLO inva021.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727054AbfEPLt6 (ORCPT ); Thu, 16 May 2019 07:49:58 -0400 Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 177252001D3; Thu, 16 May 2019 13:49:56 +0200 (CEST) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 09552200061; Thu, 16 May 2019 13:49:56 +0200 (CEST) Received: from fsr-ub1864-101.ea.freescale.net (fsr-ub1864-101.ea.freescale.net [10.171.82.13]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id 7D9BF205CD; Thu, 16 May 2019 13:49:55 +0200 (CEST) From: laurentiu.tudor@nxp.com To: hch@lst.de, stern@rowland.harvard.edu, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, marex@denx.de Cc: leoyang.li@nxp.com, linux-kernel@vger.kernel.org, robin.murphy@arm.com, noring@nocrew.org, JuergenUrban@gmx.de, Laurentiu Tudor Subject: [PATCH v4 2/3] usb: host: ohci-sm501: init genalloc for local memory Date: Thu, 16 May 2019 14:47:20 +0300 Message-Id: <20190516114721.27694-3-laurentiu.tudor@nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190516114721.27694-1-laurentiu.tudor@nxp.com> References: <20190516114721.27694-1-laurentiu.tudor@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP 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 From: Laurentiu Tudor In preparation for dropping the existing "coherent" dma mem declaration APIs, replace the current dma_declare_coherent_memory() based mechanism with the creation of a genalloc pool that will be used in the OHCI subsystem as replacement for the DMA APIs. For context, see thread here: https://lkml.org/lkml/2019/4/22/357 Signed-off-by: Laurentiu Tudor --- drivers/usb/host/ohci-sm501.c | 68 +++++++++++++++++++++-------------- 1 file changed, 41 insertions(+), 27 deletions(-) diff --git a/drivers/usb/host/ohci-sm501.c b/drivers/usb/host/ohci-sm501.c index c26228c25f99..1a25f5396e3e 100644 --- a/drivers/usb/host/ohci-sm501.c +++ b/drivers/usb/host/ohci-sm501.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -92,6 +93,7 @@ static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev) struct resource *res, *mem; int retval, irq; struct usb_hcd *hcd = NULL; + void __iomem *local_mem; irq = retval = platform_get_irq(pdev, 0); if (retval < 0) @@ -110,40 +112,18 @@ static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev) goto err0; } - /* The sm501 chip is equipped with local memory that may be used - * by on-chip devices such as the video controller and the usb host. - * This driver uses dma_declare_coherent_memory() to make sure - * usb allocations with dma_alloc_coherent() allocate from - * this local memory. The dma_handle returned by dma_alloc_coherent() - * will be an offset starting from 0 for the first local memory byte. - * - * So as long as data is allocated using dma_alloc_coherent() all is - * fine. This is however not always the case - buffers may be allocated - * using kmalloc() - so the usb core needs to be told that it must copy - * data into our local memory if the buffers happen to be placed in - * regular memory. The HCD_LOCAL_MEM flag does just that. - */ - - retval = dma_declare_coherent_memory(dev, mem->start, - mem->start - mem->parent->start, - resource_size(mem)); - if (retval) { - dev_err(dev, "cannot declare coherent memory\n"); - goto err1; - } - /* allocate, reserve and remap resources for registers */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (res == NULL) { dev_err(dev, "no resource definition for registers\n"); retval = -ENOENT; - goto err2; + goto err1; } hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); if (!hcd) { retval = -ENOMEM; - goto err2; + goto err1; } hcd->rsrc_start = res->start; @@ -164,6 +144,43 @@ static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev) ohci_hcd_init(hcd_to_ohci(hcd)); + /* The sm501 chip is equipped with local memory that may be used + * by on-chip devices such as the video controller and the usb host. + * This driver uses genalloc so that usb allocations with + * gen_pool_dma_alloc() allocate from this local memory. The dma_handle + * returned by gen_pool_dma_alloc() will be an offset starting from 0 + * for the first local memory byte. + * + * So as long as data is allocated using gen_pool_dma_alloc() all is + * fine. This is however not always the case - buffers may be allocated + * using kmalloc() - so the usb core needs to be told that it must copy + * data into our local memory if the buffers happen to be placed in + * regular memory. The HCD_LOCAL_MEM flag does just that. + */ + + hcd->localmem_pool = devm_gen_pool_create(dev, PAGE_SHIFT, + dev_to_node(dev), + "ohci-sm501"); + if (IS_ERR(hcd->localmem_pool)) { + retval = PTR_ERR(hcd->localmem_pool); + goto err5; + } + + local_mem = devm_ioremap(dev, mem->start, resource_size(mem)); + if (!local_mem) { + retval = -ENOMEM; + goto err5; + } + + retval = gen_pool_add_virt(hcd->localmem_pool, + (unsigned long)local_mem, + mem->start - mem->parent->start, + resource_size(mem), + dev_to_node(dev)); + if (retval < 0) { + dev_err(dev, "failed to add to pool: %d\n", retval); + goto err5; + } retval = usb_add_hcd(hcd, irq, IRQF_SHARED); if (retval) goto err5; @@ -181,8 +198,6 @@ static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev) release_mem_region(hcd->rsrc_start, hcd->rsrc_len); err3: usb_put_hcd(hcd); -err2: - dma_release_declared_memory(dev); err1: release_mem_region(mem->start, resource_size(mem)); err0: @@ -197,7 +212,6 @@ static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev) usb_remove_hcd(hcd); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); - dma_release_declared_memory(&pdev->dev); mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (mem) release_mem_region(mem->start, resource_size(mem));