From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754030AbcLNAPm (ORCPT ); Tue, 13 Dec 2016 19:15:42 -0500 Received: from Galois.linutronix.de ([146.0.238.70]:42872 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753301AbcLNANk (ORCPT ); Tue, 13 Dec 2016 19:13:40 -0500 From: Holger Dengler To: Lee Jones , Arnd Bergmann , Greg Kroah-Hartman , Vinod Koul Cc: linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, Thomas Gleixner , Sebastian Siewior , Juergen Bubeck , Peter Mahler , Holger Dengler , Benedikt Spranger Subject: [PATCH 06/12] mfd: flexcard: add DMA device Date: Wed, 14 Dec 2016 01:11:47 +0100 Message-Id: <1481674313-30378-7-git-send-email-dengler@linutronix.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1481674313-30378-1-git-send-email-dengler@linutronix.de> References: <1481674313-30378-1-git-send-email-dengler@linutronix.de> X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The Flexcard interface design split packet receive and transmit. All received packets and card status information are multiplexed with a Flexcard specific protocol and handled through a DMA capable ringbuffer. The TX path has to poke each available component separate. Add a platform device for the DMA receive channel. Signed-off-by: Benedikt Spranger Signed-off-by: Holger Dengler cc: Lee Jones --- drivers/mfd/flexcard_core.c | 67 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/drivers/mfd/flexcard_core.c b/drivers/mfd/flexcard_core.c index b7aead5..55bcfec 100644 --- a/drivers/mfd/flexcard_core.c +++ b/drivers/mfd/flexcard_core.c @@ -32,11 +32,41 @@ #define FLEXCARD_CLKRST_SIZE 0x3 #define FLEXCARD_NF_START 0x170 #define FLEXCARD_NF_SIZE 0x7 +#define FLEXCARD_DMA_START 0x500 +#define FLEXCARD_DMA_SIZE 0x80 #define FLEXCARD_CLK_START 0x700 #define FLEXCARD_CLK_SIZE 0x13 +#define FLEXCARD_DMA_IRQ_CO 0 +#define FLEXCARD_DMA_IRQ_TE 1 +#define FLEXCARD_DMA_IRQ_TI 2 +#define FLEXCARD_DMA_IRQ_CBL 3 + +/* The first FW Version supporting DMA is 6.4.0 */ +#define DMA_MIN_FW_MAJOR 6 +#define DMA_MIN_FW_MINOR 4 +#define DMA_MIN_FW_UPDATE 0 + static DEFINE_IDA(flexcard_ida); +static struct resource flexcard_dma_res[] = { + DEFINE_RES_MEM_NAMED(FLEXCARD_DMA_START, + FLEXCARD_DMA_SIZE, + "flexcard-dma"), + DEFINE_RES_IRQ_NAMED(FLEXCARD_DMA_IRQ_CBL, + "flexcard-dma-cbl"), + DEFINE_RES_IRQ_NAMED(FLEXCARD_DMA_IRQ_CO, + "flexcard-dma-co"), +}; + +static struct mfd_cell flexcard_dma_dev[] = { + { + .name = "flexcard-dma", + .num_resources = ARRAY_SIZE(flexcard_dma_res), + .resources = flexcard_dma_res, + }, +}; + static struct resource flexcard_clk_res[] = { DEFINE_RES_MEM_NAMED(FLEXCARD_CLK_START, FLEXCARD_CLK_SIZE, @@ -102,6 +132,37 @@ static int flexcard_misc_setup(struct flexcard_device *priv) &pdev->resource[0], 0, NULL); } +static int flexcard_add_dma(struct flexcard_device *priv) +{ + struct pci_dev *pdev = priv->pdev; + union { + struct fc_version ver; + u32 reg; + } fw_ver; + + /* check for a DMA capable firmware version*/ + fw_ver.reg = readl(&priv->bar0->conf.fc_fw_ver); + if (fw_ver.ver.maj < DMA_MIN_FW_MAJOR) + goto out; + + if (fw_ver.ver.maj == DMA_MIN_FW_MAJOR) { + if (fw_ver.ver.min < DMA_MIN_FW_MINOR) + goto out; + if ((fw_ver.ver.min == DMA_MIN_FW_MINOR) && + (fw_ver.ver.dev < DMA_MIN_FW_UPDATE)) + goto out; + } + + return mfd_add_devices(&pdev->dev, 0, flexcard_dma_dev, + ARRAY_SIZE(flexcard_dma_dev), + &pdev->resource[0], 0, priv->dma_domain); + +out: + dev_info(&pdev->dev, "Firmware is not DMA capable\n"); + + return 0; +} + static int flexcard_tiny_can(struct flexcard_device *priv, int idx, int id, u32 offset) { @@ -267,6 +328,12 @@ static int flexcard_probe(struct pci_dev *pdev, goto out_mfd_dev_remove; } + ret = flexcard_add_dma(priv); + if (ret) { + dev_err(&pdev->dev, "unable to add DMA device: %d", ret); + goto out_mfd_dev_remove; + } + dev_info(&pdev->dev, "HW %02x.%02x.%02x FW %02x.%02x.%02x\n", hw_ver.ver.maj, hw_ver.ver.min, hw_ver.ver.dev, fw_ver.ver.maj, fw_ver.ver.min, fw_ver.ver.dev); -- 2.1.4