From patchwork Wed Feb 3 21:57:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gustavo Pimentel X-Patchwork-Id: 12065597 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 683E0C433DB for ; Wed, 3 Feb 2021 22:11:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2F7B764E06 for ; Wed, 3 Feb 2021 22:11:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232695AbhBCWJA (ORCPT ); Wed, 3 Feb 2021 17:09:00 -0500 Received: from smtprelay-out1.synopsys.com ([149.117.87.133]:52218 "EHLO smtprelay-out1.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232570AbhBCV7V (ORCPT ); Wed, 3 Feb 2021 16:59:21 -0500 Received: from mailhost.synopsys.com (mdc-mailhost1.synopsys.com [10.225.0.209]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id 41001C0118; Wed, 3 Feb 2021 21:58:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1612389500; bh=Dhv3HKnMcUCdDjHuppD9lFN5HMrBEFpVf+0pawhZA0Q=; h=From:To:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=YQn/wJFKQc3M2zYS4oUbEKnuDJ0hlh5FsltMK5neSQXrPT8FGUeQZXK1bBC/nCSn5 oCs9IHCHS9eKQrVNMudUl+hzm5LaHuHyc0lrCc9jUnxXz205LExgRmwa4OkBg5x85B x74pBqb82rhni/VsNrEy2eWZPm7uZDCfRPB+/0iMTYfvmdl2YBWLp0U6yRT1wzr2EN iR6pTUwTgbzo4ZTgItvTUBRMFCbezrcXFptC9ptICNbHF0Vsh9dqErOvhM/HkbReXt U9ORNzv84eHWvjHPa5//xfGW0JrJWfvGHn5rsj15Q4ttl/H+fjaN+/b0eUthjkUtp9 cbVurrxLc/k5Q== Received: from de02dwia024.internal.synopsys.com (de02dwia024.internal.synopsys.com [10.225.19.81]) by mailhost.synopsys.com (Postfix) with ESMTP id 11480A024C; Wed, 3 Feb 2021 21:58:19 +0000 (UTC) X-SNPS-Relay: synopsys.com From: Gustavo Pimentel To: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, Vinod Koul , Dan Williams , Bjorn Helgaas , Gustavo Pimentel Subject: [PATCH v4 05/15] dmaengine: dw-edma: Add PCIe VSEC data retrieval support Date: Wed, 3 Feb 2021 22:57:56 +0100 Message-Id: <6fe327ce082c450e8494b0a1216eb2c8aa82fa98.1612389406.git.gustavo.pimentel@synopsys.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The latest eDMA IP development implements a Vendor-Specific Extended Capability that contains the eDMA BAR, offset, map format, and the number of read/write channels available. Signed-off-by: Gustavo Pimentel --- drivers/dma/dw-edma/dw-edma-core.c | 20 ++++--- drivers/dma/dw-edma/dw-edma-pcie.c | 114 ++++++++++++++++++++++++++++--------- 2 files changed, 99 insertions(+), 35 deletions(-) diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c index b971505..b65c32e1 100644 --- a/drivers/dma/dw-edma/dw-edma-core.c +++ b/drivers/dma/dw-edma/dw-edma-core.c @@ -863,15 +863,19 @@ int dw_edma_probe(struct dw_edma_chip *chip) raw_spin_lock_init(&dw->lock); - /* Find out how many write channels are supported by hardware */ - dw->wr_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_WRITE); - if (!dw->wr_ch_cnt) - return -EINVAL; + if (!dw->wr_ch_cnt) { + /* Find out how many write channels are supported by hardware */ + dw->wr_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_WRITE); + if (!dw->wr_ch_cnt) + return -EINVAL; + } - /* Find out how many read channels are supported by hardware */ - dw->rd_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_READ); - if (!dw->rd_ch_cnt) - return -EINVAL; + if (!dw->rd_ch_cnt) { + /* Find out how many read channels are supported by hardware */ + dw->rd_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_READ); + if (!dw->rd_ch_cnt) + return -EINVAL; + } dev_vdbg(dev, "Channels:\twrite=%d, read=%d\n", dw->wr_ch_cnt, dw->rd_ch_cnt); diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c index c130549..7077d79 100644 --- a/drivers/dma/dw-edma/dw-edma-pcie.c +++ b/drivers/dma/dw-edma/dw-edma-pcie.c @@ -13,9 +13,16 @@ #include #include #include +#include #include "dw-edma-core.h" +#define DW_PCIE_VSEC_DMA_ID 0x6 +#define DW_PCIE_VSEC_DMA_BAR GENMASK(10, 8) +#define DW_PCIE_VSEC_DMA_MAP GENMASK(2, 0) +#define DW_PCIE_VSEC_DMA_RD_CH GENMASK(25, 16) +#define DW_PCIE_VSEC_DMA_WR_CH GENMASK(9, 0) + struct dw_edma_pcie_data { /* eDMA registers location */ enum pci_barno rg_bar; @@ -32,6 +39,8 @@ struct dw_edma_pcie_data { /* Other */ enum dw_edma_map_format mf; u8 irqs; + u16 rd_ch_cnt; + u16 wr_ch_cnt; }; static const struct dw_edma_pcie_data snps_edda_data = { @@ -50,6 +59,8 @@ static const struct dw_edma_pcie_data snps_edda_data = { /* Other */ .mf = EDMA_MF_EDMA_UNROLL, .irqs = 1, + .rd_ch_cnt = 0, + .wr_ch_cnt = 0, }; static int dw_edma_pcie_irq_vector(struct device *dev, unsigned int nr) @@ -61,10 +72,49 @@ static const struct dw_edma_core_ops dw_edma_pcie_core_ops = { .irq_vector = dw_edma_pcie_irq_vector, }; +static void dw_edma_pcie_get_vsec_dma_data(struct pci_dev *pdev, + struct dw_edma_pcie_data *pdata) +{ + u32 val, map; + u16 vsec; + u64 off; + + vsec = pci_find_vsec_capability(pdev, DW_PCIE_VSEC_DMA_ID); + if (!vsec) + return; + + pci_read_config_dword(pdev, vsec + PCI_VSEC_HEADER, &val); + if (PCI_VSEC_CAP_REV(val) != 0x00 || PCI_VSEC_CAP_LEN(val) != 0x18) + return; + + pci_dbg(pdev, "Detected PCIe Vendor-Specific Extended Capability DMA\n"); + pci_read_config_dword(pdev, vsec + 0x8, &val); + map = FIELD_GET(DW_PCIE_VSEC_DMA_MAP, val); + if (map != EDMA_MF_EDMA_LEGACY && + map != EDMA_MF_EDMA_UNROLL && + map != EDMA_MF_HDMA_COMPAT) + return; + + pdata->mf = map; + pdata->rg_bar = FIELD_GET(DW_PCIE_VSEC_DMA_BAR, val); + + pci_read_config_dword(pdev, vsec + 0xc, &val); + pdata->rd_ch_cnt = FIELD_GET(DW_PCIE_VSEC_DMA_RD_CH, val); + pdata->wr_ch_cnt = FIELD_GET(DW_PCIE_VSEC_DMA_WR_CH, val); + + pci_read_config_dword(pdev, vsec + 0x14, &val); + off = val; + pci_read_config_dword(pdev, vsec + 0x10, &val); + off <<= 32; + off |= val; + pdata->rg_off = off; +} + static int dw_edma_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *pid) { - const struct dw_edma_pcie_data *pdata = (void *)pid->driver_data; + struct dw_edma_pcie_data *pdata = (void *)pid->driver_data; + struct dw_edma_pcie_data vsec_data; struct device *dev = &pdev->dev; struct dw_edma_chip *chip; struct dw_edma *dw; @@ -77,10 +127,18 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev, return err; } + memcpy(&vsec_data, pdata, sizeof(struct dw_edma_pcie_data)); + + /* + * Tries to find if exists a PCIe Vendor-Specific Extended Capability + * for the DMA, if exists one, then reconfigures with the new data + */ + dw_edma_pcie_get_vsec_dma_data(pdev, &vsec_data); + /* Mapping PCI BAR regions */ - err = pcim_iomap_regions(pdev, BIT(pdata->rg_bar) | - BIT(pdata->ll_bar) | - BIT(pdata->dt_bar), + err = pcim_iomap_regions(pdev, BIT(vsec_data.rg_bar) | + BIT(vsec_data.ll_bar) | + BIT(vsec_data.dt_bar), pci_name(pdev)); if (err) { pci_err(pdev, "eDMA BAR I/O remapping failed\n"); @@ -123,7 +181,7 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev, return -ENOMEM; /* IRQs allocation */ - nr_irqs = pci_alloc_irq_vectors(pdev, 1, pdata->irqs, + nr_irqs = pci_alloc_irq_vectors(pdev, 1, vsec_data.irqs, PCI_IRQ_MSI | PCI_IRQ_MSIX); if (nr_irqs < 1) { pci_err(pdev, "fail to alloc IRQ vector (number of IRQs=%u)\n", @@ -137,27 +195,29 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev, chip->id = pdev->devfn; chip->irq = pdev->irq; - dw->rg_region.vaddr = pcim_iomap_table(pdev)[pdata->rg_bar]; - dw->rg_region.vaddr += pdata->rg_off; - dw->rg_region.paddr = pdev->resource[pdata->rg_bar].start; - dw->rg_region.paddr += pdata->rg_off; - dw->rg_region.sz = pdata->rg_sz; - - dw->ll_region.vaddr = pcim_iomap_table(pdev)[pdata->ll_bar]; - dw->ll_region.vaddr += pdata->ll_off; - dw->ll_region.paddr = pdev->resource[pdata->ll_bar].start; - dw->ll_region.paddr += pdata->ll_off; - dw->ll_region.sz = pdata->ll_sz; - - dw->dt_region.vaddr = pcim_iomap_table(pdev)[pdata->dt_bar]; - dw->dt_region.vaddr += pdata->dt_off; - dw->dt_region.paddr = pdev->resource[pdata->dt_bar].start; - dw->dt_region.paddr += pdata->dt_off; - dw->dt_region.sz = pdata->dt_sz; - - dw->mf = pdata->mf; + dw->rg_region.vaddr = pcim_iomap_table(pdev)[vsec_data.rg_bar]; + dw->rg_region.vaddr += vsec_data.rg_off; + dw->rg_region.paddr = pdev->resource[vsec_data.rg_bar].start; + dw->rg_region.paddr += vsec_data.rg_off; + dw->rg_region.sz = vsec_data.rg_sz; + + dw->ll_region.vaddr = pcim_iomap_table(pdev)[vsec_data.ll_bar]; + dw->ll_region.vaddr += vsec_data.ll_off; + dw->ll_region.paddr = pdev->resource[vsec_data.ll_bar].start; + dw->ll_region.paddr += vsec_data.ll_off; + dw->ll_region.sz = vsec_data.ll_sz; + + dw->dt_region.vaddr = pcim_iomap_table(pdev)[vsec_data.dt_bar]; + dw->dt_region.vaddr += vsec_data.dt_off; + dw->dt_region.paddr = pdev->resource[vsec_data.dt_bar].start; + dw->dt_region.paddr += vsec_data.dt_off; + dw->dt_region.sz = vsec_data.dt_sz; + + dw->mf = vsec_data.mf; dw->nr_irqs = nr_irqs; dw->ops = &dw_edma_pcie_core_ops; + dw->rd_ch_cnt = vsec_data.rd_ch_cnt; + dw->wr_ch_cnt = vsec_data.wr_ch_cnt; /* Debug info */ if (dw->mf == EDMA_MF_EDMA_LEGACY) @@ -170,15 +230,15 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev, pci_dbg(pdev, "Version:\tUnknown (0x%x)\n", dw->mf); pci_dbg(pdev, "Registers:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n", - pdata->rg_bar, pdata->rg_off, pdata->rg_sz, + vsec_data.rg_bar, vsec_data.rg_off, vsec_data.rg_sz, dw->rg_region.vaddr, &dw->rg_region.paddr); pci_dbg(pdev, "L. List:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n", - pdata->ll_bar, pdata->ll_off, pdata->ll_sz, + vsec_data.ll_bar, vsec_data.ll_off, vsec_data.ll_sz, dw->ll_region.vaddr, &dw->ll_region.paddr); pci_dbg(pdev, "Data:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n", - pdata->dt_bar, pdata->dt_off, pdata->dt_sz, + vsec_data.dt_bar, vsec_data.dt_off, vsec_data.dt_sz, dw->dt_region.vaddr, &dw->dt_region.paddr); pci_dbg(pdev, "Nr. IRQs:\t%u\n", dw->nr_irqs);