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[89.233.200.205]) by smtp.gmail.com with ESMTPSA id ru9sm254625lbb.3.2015.11.27.15.16.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 27 Nov 2015 15:16:13 -0800 (PST) From: Anton Bondarenko To: broonie@kernel.org, b38343@freescale.com, s.hauer@pengutronix.de Cc: linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, vladimir_zapolskiy@mentor.com, jiada_wang@mentor.com Subject: [PATCH v4 5/7] spi: imx: Add support for loopback for ECSPI controllers Date: Sat, 28 Nov 2015 00:16:03 +0100 Message-Id: <1448666165-7473-6-git-send-email-anton.bondarenko.sama@gmail.com> X-Mailer: git-send-email 2.6.3 In-Reply-To: <1448666165-7473-1-git-send-email-anton.bondarenko.sama@gmail.com> References: <1448666165-7473-1-git-send-email-anton.bondarenko.sama@gmail.com> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 Support for ECSPI loopback for IMX51,IMX53 and IMX6Q using TEST register. Signed-off-by: Mohsin Kazmi Signed-off-by: Anton Bondarenko --- drivers/spi/spi-imx.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 4cd8550..f556eaa 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -270,6 +270,9 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, #define MX51_ECSPI_STAT 0x18 #define MX51_ECSPI_STAT_RR (1 << 3) +#define MX51_ECSPI_TEST 0x20 +#define MX51_ECSPI_LOOP BIT(31) + /* MX51 eCSPI */ static unsigned int mx51_ecspi_clkdiv(unsigned int fin, unsigned int fspi, unsigned int *fres) @@ -343,6 +346,7 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, u32 ctrl = MX51_ECSPI_CTRL_ENABLE, dma = 0; u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG); u32 delay; + u32 lpb = 0; /* * The hardware seems to have a race condition when changing modes. The @@ -385,6 +389,12 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG); + if (config->mode & SPI_LOOP) + lpb |= MX51_ECSPI_LOOP; + + if ((readl(spi_imx->base + MX51_ECSPI_TEST) & MX51_ECSPI_LOOP) != lpb) + writel(lpb, spi_imx->base + MX51_ECSPI_TEST); + /* * Wait until the changes in the configuration register CONFIGREG * propagate into the hardware. It takes exactly one tick of the @@ -1249,6 +1259,9 @@ static int spi_imx_probe(struct platform_device *pdev) spi_imx = spi_master_get_devdata(master); spi_imx->bitbang.master = master; + spi_imx->devtype_data = of_id ? of_id->data : + (struct spi_imx_devtype_data *)pdev->id_entry->driver_data; + for (i = 0; i < master->num_chipselect; i++) { int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); if (!gpio_is_valid(cs_gpio) && mxc_platform_info) @@ -1275,10 +1288,10 @@ static int spi_imx_probe(struct platform_device *pdev) spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message; spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; - init_completion(&spi_imx->xfer_done); + if (is_imx51_ecspi(spi_imx)) + spi_imx->bitbang.master->mode_bits |= SPI_LOOP; - spi_imx->devtype_data = of_id ? of_id->data : - (struct spi_imx_devtype_data *) pdev->id_entry->driver_data; + init_completion(&spi_imx->xfer_done); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); spi_imx->base = devm_ioremap_resource(&pdev->dev, res);