From patchwork Mon Jun 22 13:37:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Ceresoli X-Patchwork-Id: 11617751 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 38E3C138C for ; Mon, 22 Jun 2020 13:37:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2990220716 for ; Mon, 22 Jun 2020 13:37:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729187AbgFVNhn (ORCPT ); Mon, 22 Jun 2020 09:37:43 -0400 Received: from hostingweb31-40.netsons.net ([89.40.174.40]:39881 "EHLO hostingweb31-40.netsons.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728203AbgFVNhn (ORCPT ); Mon, 22 Jun 2020 09:37:43 -0400 Received: from [37.160.94.17] (port=64520 helo=melee.dev.aim) by hostingweb31.netsons.net with esmtpa (Exim 4.93) (envelope-from ) id 1jnMdl-000DM3-WC; Mon, 22 Jun 2020 15:37:38 +0200 From: Luca Ceresoli To: linux-fpga@vger.kernel.org Cc: Luca Ceresoli , Moritz Fischer , Rob Herring , Michal Simek , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Anatolij Gustschin Subject: [PATCH v2 2/2] fpga manager: xilinx-spi: check INIT_B pin during write_init Date: Mon, 22 Jun 2020 15:37:23 +0200 Message-Id: <20200622133723.23326-2-luca@lucaceresoli.net> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200622133723.23326-1-luca@lucaceresoli.net> References: <20200622133723.23326-1-luca@lucaceresoli.net> MIME-Version: 1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - hostingweb31.netsons.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lucaceresoli.net X-Get-Message-Sender-Via: hostingweb31.netsons.net: authenticated_id: luca+lucaceresoli.net/only user confirmed/virtual account not confirmed X-Authenticated-Sender: hostingweb31.netsons.net: luca@lucaceresoli.net X-Source: X-Source-Args: X-Source-Dir: Sender: linux-fpga-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org The INIT_B pin reports the status during startup and after the end of the programming process. However the current driver completely ignores it. Check the pin status during startup to make sure programming is never started too early and also to detect any hardware issues in the FPGA connection. This is optional for backward compatibility. If INIT_B is not passed by device tree, just fallback to the old udelays. Signed-off-by: Luca Ceresoli --- Changes in v2: - rename DT property init_b-gpios to init-b-gpios (Rob Herring suggested to not use '_' in property names) - improve wait_for_init_b() documentation and variable naming --- drivers/fpga/xilinx-spi.c | 55 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 54 insertions(+), 1 deletion(-) diff --git a/drivers/fpga/xilinx-spi.c b/drivers/fpga/xilinx-spi.c index 799ae04301be..2967aa2a74e2 100644 --- a/drivers/fpga/xilinx-spi.c +++ b/drivers/fpga/xilinx-spi.c @@ -23,6 +23,7 @@ struct xilinx_spi_conf { struct spi_device *spi; struct gpio_desc *prog_b; + struct gpio_desc *init_b; struct gpio_desc *done; }; @@ -36,11 +37,45 @@ static enum fpga_mgr_states xilinx_spi_state(struct fpga_manager *mgr) return FPGA_MGR_STATE_UNKNOWN; } +/** + * wait_for_init_b - wait for the INIT_B pin to have a given state, or wait + * a given delay if the pin is unavailable + * + * @mgr: The FPGA manager object + * @value: Value INIT_B to wait for (1 = asserted = low) + * @alt_udelay: Delay to wait if the INIT_B GPIO is not available + * + * Returns 0 when the INIT_B GPIO reached the given state or -ETIMEDOUT if + * too much time passed waiting for that. If no INIT_B GPIO is available + * then always return 0. + */ +static int wait_for_init_b(struct fpga_manager *mgr, int value, + unsigned long alt_udelay) +{ + struct xilinx_spi_conf *conf = mgr->priv; + unsigned long timeout = jiffies + msecs_to_jiffies(1000); + + if (conf->init_b) { + while (time_before(jiffies, timeout)) { + /* dump_state(conf, "wait for init_d .."); */ + if (gpiod_get_value(conf->init_b) == value) + return 0; + usleep_range(100, 400); + } + return -ETIMEDOUT; + } + + udelay(alt_udelay); + + return 0; +} + static int xilinx_spi_write_init(struct fpga_manager *mgr, struct fpga_image_info *info, const char *buf, size_t count) { struct xilinx_spi_conf *conf = mgr->priv; + int err; if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) { dev_err(&mgr->dev, "Partial reconfiguration not supported.\n"); @@ -49,10 +84,21 @@ static int xilinx_spi_write_init(struct fpga_manager *mgr, gpiod_set_value(conf->prog_b, 1); - udelay(1); /* min is 500 ns */ + err = wait_for_init_b(mgr, 1, 1); /* min is 500 ns */ + if (err) { + dev_err(&mgr->dev, "INIT_B pin did not go low\n"); + gpiod_set_value(conf->prog_b, 0); + return err; + } gpiod_set_value(conf->prog_b, 0); + err = wait_for_init_b(mgr, 0, 0); + if (err) { + dev_err(&mgr->dev, "INIT_B pin did not go high\n"); + return err; + } + if (gpiod_get_value(conf->done)) { dev_err(&mgr->dev, "Unexpected DONE pin state...\n"); return -EIO; @@ -154,6 +200,13 @@ static int xilinx_spi_probe(struct spi_device *spi) return PTR_ERR(conf->prog_b); } + conf->init_b = devm_gpiod_get_optional(&spi->dev, "init-b", GPIOD_IN); + if (IS_ERR(conf->init_b)) { + dev_err(&spi->dev, "Failed to get INIT_B gpio: %ld\n", + PTR_ERR(conf->init_b)); + return PTR_ERR(conf->init_b); + } + conf->done = devm_gpiod_get(&spi->dev, "done", GPIOD_IN); if (IS_ERR(conf->done)) { dev_err(&spi->dev, "Failed to get DONE gpio: %ld\n",