From patchwork Sun Mar 1 14:15:33 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Bondarenko X-Patchwork-Id: 5908191 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 3C51DBF440 for ; Sun, 1 Mar 2015 14:16:29 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2B19820383 for ; Sun, 1 Mar 2015 14:16:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E98AD20380 for ; Sun, 1 Mar 2015 14:16:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752953AbbCAOQ0 (ORCPT ); Sun, 1 Mar 2015 09:16:26 -0500 Received: from relay1.mentorg.com ([192.94.38.131]:44984 "EHLO relay1.mentorg.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752939AbbCAOQ0 (ORCPT ); Sun, 1 Mar 2015 09:16:26 -0500 Received: from svr-orw-fem-04.mgc.mentorg.com ([147.34.97.41]) by relay1.mentorg.com with esmtp id 1YS4el-0004tg-Ab from Anton_Bondarenko@mentor.com ; Sun, 01 Mar 2015 06:15:43 -0800 Received: from antonb-HP-EliteBook-8470p.world.mentorg.com (147.34.91.1) by SVR-ORW-FEM-04.mgc.mentorg.com (147.34.97.41) with Microsoft SMTP Server (TLS) id 14.3.224.2; Sun, 1 Mar 2015 06:15:42 -0800 From: Anton Bondarenko To: CC: , , Subject: [PATCH 3/3] spi: imx: add support for all SPI word width for DMA transfer Date: Sun, 1 Mar 2015 15:15:33 +0100 Message-ID: <1425219333-3014-3-git-send-email-anton_bondarenko@mentor.com> X-Mailer: git-send-email 2.3.0 In-Reply-To: <1425219333-3014-1-git-send-email-anton_bondarenko@mentor.com> References: <1425219333-3014-1-git-send-email-anton_bondarenko@mentor.com> MIME-Version: 1.0 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP DMA transfer for SPI was limited to up to 8 bits word size until now. Sync in SPI burst size and DMA bus width is necessary to correctly support other BPW supported by HW. Signed-off-by: Anton Bondarenko --- drivers/spi/spi-imx.c | 118 ++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 86 insertions(+), 32 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index f22d9cc..10d735d 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -89,11 +89,15 @@ struct spi_imx_data { struct completion xfer_done; void __iomem *base; + unsigned long base_phys; + struct clk *clk_per; struct clk *clk_ipg; unsigned long spi_clk; unsigned int spi_bus_clk; + unsigned int bpw_w; + unsigned int count; void (*tx)(struct spi_imx_data *); void (*rx)(struct spi_imx_data *); @@ -199,8 +203,14 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(master); + unsigned int bpw_w = transfer->bits_per_word; + + if (!bpw_w) + bpw_w = spi->bits_per_word; + + bpw_w = DIV_ROUND_UP(bpw_w, 8); - if (spi_imx->dma_is_inited && (transfer->len > spi_imx->wml)) + if (spi_imx->dma_is_inited && (transfer->len > spi_imx->wml * bpw_w)) return true; return false; } @@ -757,11 +767,62 @@ static irqreturn_t spi_imx_isr(int irq, void *dev_id) return IRQ_HANDLED; } +static int spi_imx_sdma_configure(struct spi_master *master) +{ + int ret; + enum dma_slave_buswidth dsb_default = DMA_SLAVE_BUSWIDTH_1_BYTE; + struct dma_slave_config slave_config = {}; + struct spi_imx_data *spi_imx = spi_master_get_devdata(master); + + switch (spi_imx->bpw_w) { + case 4: + dsb_default = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + case 2: + dsb_default = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + case 1: + dsb_default = DMA_SLAVE_BUSWIDTH_1_BYTE; + break; + default: + pr_err("Not supported word size %d\n", spi_imx->bpw_w); + ret = -EINVAL; + goto err; + } + + slave_config.direction = DMA_MEM_TO_DEV; + slave_config.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA; + slave_config.dst_addr_width = dsb_default; + slave_config.dst_maxburst = spi_imx_get_fifosize(spi_imx) + - spi_imx->wml; + ret = dmaengine_slave_config(master->dma_tx, &slave_config); + if (ret) { + pr_err("error in TX dma configuration.\n"); + goto err; + } + + memset(&slave_config, 0, sizeof(slave_config)); + + slave_config.direction = DMA_DEV_TO_MEM; + slave_config.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA; + slave_config.src_addr_width = dsb_default; + slave_config.src_maxburst = spi_imx_get_fifosize(spi_imx) + - spi_imx->wml; + ret = dmaengine_slave_config(master->dma_rx, &slave_config); + if (ret) + pr_err("error in RX dma configuration.\n"); + +err: + return ret; +} + static int spi_imx_setupxfer(struct spi_device *spi, struct spi_transfer *t) { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); struct spi_imx_config config; + unsigned int bpw_w_new; + int ret = 0; config.bpw = t ? t->bits_per_word : spi->bits_per_word; config.speed_hz = t ? t->speed_hz : spi->max_speed_hz; @@ -785,9 +846,18 @@ static int spi_imx_setupxfer(struct spi_device *spi, spi_imx->tx = spi_imx_buf_tx_u32; } - spi_imx->devtype_data->config(spi_imx, &config); + bpw_w_new = DIV_ROUND_UP(config.bpw, 8); + if (spi_imx->dma_is_inited && spi_imx->bpw_w != bpw_w_new) { + spi_imx->bpw_w = bpw_w_new; + ret = spi_imx_sdma_configure(spi->master); + if (ret != 0) + pr_err("Can't configure SDMA, error %d\n", ret); + } - return 0; + if (!ret) + ret = spi_imx->devtype_data->config(spi_imx, &config); + + return ret; } static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx) @@ -808,10 +878,8 @@ static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx) } static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx, - struct spi_master *master, - const struct resource *res) + struct spi_master *master) { - struct dma_slave_config slave_config = {}; int ret; /* use pio mode for i.mx6dl chip TKT238285 */ @@ -828,17 +896,6 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx, goto err; } - slave_config.direction = DMA_MEM_TO_DEV; - slave_config.dst_addr = res->start + MXC_CSPITXDATA; - slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; - slave_config.dst_maxburst = spi_imx_get_fifosize(spi_imx) - - spi_imx->wml; - ret = dmaengine_slave_config(master->dma_tx, &slave_config); - if (ret) { - dev_err(dev, "error in TX dma configuration.\n"); - goto err; - } - /* Prepare for RX : */ master->dma_rx = dma_request_slave_channel(dev, "rx"); if (!master->dma_rx) { @@ -847,23 +904,19 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx, goto err; } - slave_config.direction = DMA_DEV_TO_MEM; - slave_config.src_addr = res->start + MXC_CSPIRXDATA; - slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; - slave_config.src_maxburst = spi_imx_get_fifosize(spi_imx) - - spi_imx->wml; - ret = dmaengine_slave_config(master->dma_rx, &slave_config); - if (ret) { - dev_err(dev, "error in RX dma configuration.\n"); - goto err; - } - init_completion(&spi_imx->dma_rx_completion); init_completion(&spi_imx->dma_tx_completion); master->can_dma = spi_imx_can_dma; master->max_dma_len = MAX_SDMA_BD_BYTES; spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX; + spi_imx->bpw_w = 1; + ret = spi_imx_sdma_configure(master); + if (ret) { + dev_info(dev, "cannot get setup DMA.\n"); + goto err; + } + spi_imx->dma_is_inited = 1; return 0; @@ -920,7 +973,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, int ret; unsigned long timeout; unsigned long transfer_timeout; - const int left = transfer->len % spi_imx->wml; + const int left = transfer->len % (spi_imx->wml * spi_imx->bpw_w); struct spi_master *master = spi_imx->bitbang.master; struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg; @@ -1001,7 +1054,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, spi_imx->rx_buf = transfer->rx_buf + (transfer->len - left); - spi_imx->txfifo = left; + spi_imx->txfifo = DIV_ROUND_UP(left, spi_imx->bpw_w); reinit_completion(&spi_imx->xfer_done); spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TCEN); @@ -1203,6 +1256,7 @@ static int spi_imx_probe(struct platform_device *pdev) ret = PTR_ERR(spi_imx->base); goto out_master_put; } + spi_imx->base_phys = res->start; irq = platform_get_irq(pdev, 0); if (irq < 0) { @@ -1242,8 +1296,8 @@ static int spi_imx_probe(struct platform_device *pdev) * Only validated on i.mx6 now, can remove the constrain if validated on * other chips. */ - if (spi_imx->devtype_data == &imx51_ecspi_devtype_data - && spi_imx_sdma_init(&pdev->dev, spi_imx, master, res)) + if (spi_imx->devtype_data == &imx51_ecspi_devtype_data && + spi_imx_sdma_init(&pdev->dev, spi_imx, master)) dev_err(&pdev->dev, "dma setup error,use pio instead\n"); spi_imx->devtype_data->reset(spi_imx);