From patchwork Mon Jan 29 22:56:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charles Perry X-Patchwork-Id: 767663 Received: from mail.savoirfairelinux.com (mail.savoirfairelinux.com [208.88.110.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3DDC94F5ED; Mon, 29 Jan 2024 22:56:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=208.88.110.44 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706568989; cv=none; b=S/r5p34quGkMxhEUutU+pWARjNknyAmT/PLU9ITlPUN3JO2waWqbu92ifL/+IkLNqDpitMHwQPIuyLC4mNSZEFPiVeY/asQ3oj/F0joButpeb8+xqy26oYCjR5pxgPoPh9YK98Z5pdoCy8MzqKjwgSsOSE0QyF2CNThDxciVGgA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706568989; c=relaxed/simple; bh=Vdt6zzGCnz4ON7W184F6UA1X8WKxEyaQezxOdmyCp2c=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=g/ci86rXJvLC6Pfwp4ceSCYFqYQSO8P7vwEtHtUOOLn3MutatCDBfO/x7oHyhsqAhTmohXmcnKg2CFznWuZf/77Z9KWeu/V46fNIkz+rKq/oWN4Ig6ZEuTCkEIGnE7xFymejdbi+hogeFolYXD9VCOtUkZMQ7T/KFbvvvfsEFEk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=savoirfairelinux.com; spf=pass smtp.mailfrom=savoirfairelinux.com; dkim=pass (2048-bit key) header.d=savoirfairelinux.com header.i=@savoirfairelinux.com header.b=l5KtMpis; arc=none smtp.client-ip=208.88.110.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=savoirfairelinux.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=savoirfairelinux.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=savoirfairelinux.com header.i=@savoirfairelinux.com header.b="l5KtMpis" Received: from localhost (localhost [127.0.0.1]) by mail.savoirfairelinux.com (Postfix) with ESMTP id 7C26E9C2D22; Mon, 29 Jan 2024 17:56:18 -0500 (EST) Received: from mail.savoirfairelinux.com ([127.0.0.1]) by localhost (mail.savoirfairelinux.com [127.0.0.1]) (amavis, port 10032) with ESMTP id 3cbqhkf9hxjW; Mon, 29 Jan 2024 17:56:17 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mail.savoirfairelinux.com (Postfix) with ESMTP id 2439E9C45C6; Mon, 29 Jan 2024 17:56:17 -0500 (EST) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.savoirfairelinux.com 2439E9C45C6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=savoirfairelinux.com; s=DFC430D2-D198-11EC-948E-34200CB392D2; t=1706568977; bh=y6z1gTE4j19+eEg9PnR1EFGgw9U4TMFqauCXWaMmKYQ=; h=From:To:Date:Message-ID:MIME-Version; b=l5KtMpisXrCwPRIU7BcrYxw6sFskZJSym0uMdNLxxAn1rh4yedK5z5LsTi8FxBZkF eXbtZah2bLkarrxyZM2z6rL2GDGCtBkglNdZuB8eMwEZqAhUkXJ3vUIlVKFD0IVgIj +9x76YI1dJMl9RDCUa50muAuuzFszJVmSNIRNLB58vDPqklTyMmIpO0tZ+MqPlbJrF f9YXhXg8G3hsp/TvKfdqO/Nv5JdPmYiM2mTh13YixC0c7hKMZJXtk4sAbGeN0Hy3WF rSHGeGkyM/uXlXPYa31bzmxcgi8qfklkvlVO4Us2PztOsMyrgccYOgzdt9+1Uv5GaU SWlGYNaqopGPA== X-Virus-Scanned: amavis at mail.savoirfairelinux.com Received: from mail.savoirfairelinux.com ([127.0.0.1]) by localhost (mail.savoirfairelinux.com [127.0.0.1]) (amavis, port 10026) with ESMTP id a7QWPjPclxKh; Mon, 29 Jan 2024 17:56:17 -0500 (EST) Received: from pcperry.mtl.sfl (unknown [192.168.51.254]) by mail.savoirfairelinux.com (Postfix) with ESMTPSA id F36919C2D22; Mon, 29 Jan 2024 17:56:16 -0500 (EST) From: Charles Perry To: mdf@kernel.org Cc: hao.wu@intel.com, yilun.xu@intel.com, trix@redhat.com, krzysztof.kozlowski+dt@linaro.org, bcody@markem-imaje.com, avandiver@markem-imaje.com, linux-fpga@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Charles Perry Subject: [PATCH 1/3] fpga: xilinx-spi: extract a common driver core Date: Mon, 29 Jan 2024 17:56:00 -0500 Message-ID: <20240129225602.3832449-1-charles.perry@savoirfairelinux.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Factor out the gpio handshaking (using PROGRAM_B, INIT_B and DONE) protocol in xilinx-core so that it can be reused for another driver. This commit does not change anything functionally to xilinx-spi. xilinx-core expects drivers to provide two operations: * ->write(const char* buf, size_t count): write to the device * ->write_one_dummy_byte(): write 0xFF to the device Signed-off-by: Charles Perry --- drivers/fpga/Kconfig | 4 + drivers/fpga/Makefile | 1 + drivers/fpga/xilinx-core.c | 210 +++++++++++++++++++++++++++++++++++++ drivers/fpga/xilinx-core.h | 27 +++++ drivers/fpga/xilinx-spi.c | 202 +++-------------------------------- 5 files changed, 256 insertions(+), 188 deletions(-) create mode 100644 drivers/fpga/xilinx-core.c create mode 100644 drivers/fpga/xilinx-core.h diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig index 2f689ac4ba3a3..d27a1ebf40838 100644 --- a/drivers/fpga/Kconfig +++ b/drivers/fpga/Kconfig @@ -64,9 +64,13 @@ config FPGA_MGR_STRATIX10_SOC help FPGA manager driver support for the Intel Stratix10 SoC. +config FPGA_MGR_XILINX_CORE + tristate + config FPGA_MGR_XILINX_SPI tristate "Xilinx Configuration over Slave Serial (SPI)" depends on SPI + select FPGA_MGR_XILINX_CORE help FPGA manager driver support for Xilinx FPGA configuration over slave serial interface. diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile index 352a2612623e0..7ec795b6a5a70 100644 --- a/drivers/fpga/Makefile +++ b/drivers/fpga/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_FPGA_MGR_SOCFPGA) += socfpga.o obj-$(CONFIG_FPGA_MGR_SOCFPGA_A10) += socfpga-a10.o obj-$(CONFIG_FPGA_MGR_STRATIX10_SOC) += stratix10-soc.o obj-$(CONFIG_FPGA_MGR_TS73XX) += ts73xx-fpga.o +obj-$(CONFIG_FPGA_MGR_XILINX_CORE) += xilinx-core.o obj-$(CONFIG_FPGA_MGR_XILINX_SPI) += xilinx-spi.o obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA) += zynq-fpga.o obj-$(CONFIG_FPGA_MGR_ZYNQMP_FPGA) += zynqmp-fpga.o diff --git a/drivers/fpga/xilinx-core.c b/drivers/fpga/xilinx-core.c new file mode 100644 index 0000000000000..47839b5541ddd --- /dev/null +++ b/drivers/fpga/xilinx-core.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Common parts of the Xilinx Spartan6 and 7 Series FPGA manager drivers. + * + * Copyright (C) 2017 DENX Software Engineering + * + * Anatolij Gustschin + */ + +#include "xilinx-core.h" + +#include +#include +#include +#include + +static int get_done_gpio(struct fpga_manager *mgr) +{ + struct xilinx_fpga_core *core = mgr->priv; + int ret; + + ret = gpiod_get_value(core->done); + + if (ret < 0) + dev_err(&mgr->dev, "Error reading DONE (%d)\n", ret); + + return ret; +} + +static enum fpga_mgr_states xilinx_core_state(struct fpga_manager *mgr) +{ + if (!get_done_gpio(mgr)) + return FPGA_MGR_STATE_RESET; + + 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_fpga_core *core = mgr->priv; + unsigned long timeout = jiffies + msecs_to_jiffies(1000); + + if (core->init_b) { + while (time_before(jiffies, timeout)) { + int ret = gpiod_get_value(core->init_b); + + if (ret == value) + return 0; + + if (ret < 0) { + dev_err(&mgr->dev, "Error reading INIT_B (%d)\n", ret); + return ret; + } + + usleep_range(100, 400); + } + + dev_err(&mgr->dev, "Timeout waiting for INIT_B to %s\n", + value ? "assert" : "deassert"); + return -ETIMEDOUT; + } + + udelay(alt_udelay); + + return 0; +} + +static int xilinx_core_write_init(struct fpga_manager *mgr, + struct fpga_image_info *info, + const char *buf, size_t count) +{ + struct xilinx_fpga_core *core = mgr->priv; + int err; + + if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) { + dev_err(&mgr->dev, "Partial reconfiguration not supported\n"); + return -EINVAL; + } + + gpiod_set_value(core->prog_b, 1); + + err = wait_for_init_b(mgr, 1, 1); /* min is 500 ns */ + if (err) { + gpiod_set_value(core->prog_b, 0); + return err; + } + + gpiod_set_value(core->prog_b, 0); + + err = wait_for_init_b(mgr, 0, 0); + if (err) + return err; + + if (get_done_gpio(mgr)) { + dev_err(&mgr->dev, "Unexpected DONE pin state...\n"); + return -EIO; + } + + /* program latency */ + usleep_range(7500, 7600); + return 0; +} + +static int xilinx_core_write(struct fpga_manager *mgr, const char *buf, + size_t count) +{ + struct xilinx_fpga_core *core = mgr->priv; + + return core->write(core, buf, count); +} + +static int xilinx_core_write_complete(struct fpga_manager *mgr, + struct fpga_image_info *info) +{ + struct xilinx_fpga_core *core = mgr->priv; + unsigned long timeout = jiffies + usecs_to_jiffies(info->config_complete_timeout_us); + bool expired = false; + int done; + int ret; + + /* + * This loop is carefully written such that if the driver is + * scheduled out for more than 'timeout', we still check for DONE + * before giving up and we apply 8 extra CCLK cycles in all cases. + */ + while (!expired) { + expired = time_after(jiffies, timeout); + + done = get_done_gpio(mgr); + if (done < 0) + return done; + + ret = core->write_one_dummy_byte(core); + if (ret) + return ret; + + if (done) + return 0; + } + + if (core->init_b) { + ret = gpiod_get_value(core->init_b); + + if (ret < 0) { + dev_err(&mgr->dev, "Error reading INIT_B (%d)\n", ret); + return ret; + } + + dev_err(&mgr->dev, + ret ? "CRC error or invalid device\n" + : "Missing sync word or incomplete bitstream\n"); + } else { + dev_err(&mgr->dev, "Timeout after config data transfer\n"); + } + + return -ETIMEDOUT; +} + +static const struct fpga_manager_ops xilinx_core_ops = { + .state = xilinx_core_state, + .write_init = xilinx_core_write_init, + .write = xilinx_core_write, + .write_complete = xilinx_core_write_complete, +}; + +int xilinx_core_probe(struct xilinx_fpga_core *core, + struct device *dev, + xilinx_write_func write, + xilinx_write_one_dummy_byte_func write_one_dummy_byte) +{ + struct fpga_manager *mgr; + + core->dev = dev; + core->write = write; + core->write_one_dummy_byte = write_one_dummy_byte; + + /* PROGRAM_B is active low */ + core->prog_b = devm_gpiod_get(dev, "prog_b", GPIOD_OUT_LOW); + if (IS_ERR(core->prog_b)) + return dev_err_probe(dev, PTR_ERR(core->prog_b), + "Failed to get PROGRAM_B gpio\n"); + + core->init_b = devm_gpiod_get_optional(dev, "init-b", GPIOD_IN); + if (IS_ERR(core->init_b)) + return dev_err_probe(dev, PTR_ERR(core->init_b), + "Failed to get INIT_B gpio\n"); + + core->done = devm_gpiod_get(dev, "done", GPIOD_IN); + if (IS_ERR(core->done)) + return dev_err_probe(dev, PTR_ERR(core->done), + "Failed to get DONE gpio\n"); + + mgr = devm_fpga_mgr_register(dev, + "Xilinx Slave Serial FPGA Manager", + &xilinx_core_ops, core); + return PTR_ERR_OR_ZERO(mgr); +} diff --git a/drivers/fpga/xilinx-core.h b/drivers/fpga/xilinx-core.h new file mode 100644 index 0000000000000..2e6ce2235531f --- /dev/null +++ b/drivers/fpga/xilinx-core.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef __XILINX_CORE_H +#define __XILINX_CORE_H + +#include + +struct xilinx_fpga_core; + +typedef int (*xilinx_write_func)(struct xilinx_fpga_core *core, const char *buf, + size_t count); +typedef int (*xilinx_write_one_dummy_byte_func)(struct xilinx_fpga_core *core); + +struct xilinx_fpga_core { + struct device *dev; + xilinx_write_func write; + xilinx_write_one_dummy_byte_func write_one_dummy_byte; + struct gpio_desc *prog_b; + struct gpio_desc *init_b; + struct gpio_desc *done; +}; + +int xilinx_core_probe(struct xilinx_fpga_core *core, struct device *dev, + xilinx_write_func write, + xilinx_write_one_dummy_byte_func write_one_dummy_byte); + +#endif /* __XILINX_CORE_H */ diff --git a/drivers/fpga/xilinx-spi.c b/drivers/fpga/xilinx-spi.c index e1a227e7ff2ae..71d8d421f3c63 100644 --- a/drivers/fpga/xilinx-spi.c +++ b/drivers/fpga/xilinx-spi.c @@ -10,127 +10,25 @@ * the slave serial configuration interface. */ -#include -#include -#include -#include +#include "xilinx-core.h" + #include #include #include #include -#include struct xilinx_spi_conf { + struct xilinx_fpga_core core; struct spi_device *spi; - struct gpio_desc *prog_b; - struct gpio_desc *init_b; - struct gpio_desc *done; }; -static int get_done_gpio(struct fpga_manager *mgr) -{ - struct xilinx_spi_conf *conf = mgr->priv; - int ret; - - ret = gpiod_get_value(conf->done); - - if (ret < 0) - dev_err(&mgr->dev, "Error reading DONE (%d)\n", ret); - - return ret; -} - -static enum fpga_mgr_states xilinx_spi_state(struct fpga_manager *mgr) -{ - if (!get_done_gpio(mgr)) - return FPGA_MGR_STATE_RESET; - - 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)) { - int ret = gpiod_get_value(conf->init_b); - - if (ret == value) - return 0; - - if (ret < 0) { - dev_err(&mgr->dev, "Error reading INIT_B (%d)\n", ret); - return ret; - } - - usleep_range(100, 400); - } - - dev_err(&mgr->dev, "Timeout waiting for INIT_B to %s\n", - value ? "assert" : "deassert"); - 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"); - return -EINVAL; - } - - gpiod_set_value(conf->prog_b, 1); - - err = wait_for_init_b(mgr, 1, 1); /* min is 500 ns */ - if (err) { - 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) - return err; - - if (get_done_gpio(mgr)) { - dev_err(&mgr->dev, "Unexpected DONE pin state...\n"); - return -EIO; - } - - /* program latency */ - usleep_range(7500, 7600); - return 0; -} +#define to_xilinx_spi_conf(obj) \ + container_of(obj, struct xilinx_spi_conf, core) -static int xilinx_spi_write(struct fpga_manager *mgr, const char *buf, +static int xilinx_spi_write(struct xilinx_fpga_core *core, const char *buf, size_t count) { - struct xilinx_spi_conf *conf = mgr->priv; + struct xilinx_spi_conf *conf = to_xilinx_spi_conf(core); const char *fw_data = buf; const char *fw_data_end = fw_data + count; @@ -143,7 +41,7 @@ static int xilinx_spi_write(struct fpga_manager *mgr, const char *buf, ret = spi_write(conf->spi, fw_data, stride); if (ret) { - dev_err(&mgr->dev, "SPI error in firmware write: %d\n", + dev_err(core->dev, "SPI error in firmware write: %d\n", ret); return ret; } @@ -153,77 +51,22 @@ static int xilinx_spi_write(struct fpga_manager *mgr, const char *buf, return 0; } -static int xilinx_spi_apply_cclk_cycles(struct xilinx_spi_conf *conf) +static int xilinx_spi_apply_cclk_cycles(struct xilinx_fpga_core *core) { - struct spi_device *spi = conf->spi; + struct xilinx_spi_conf *conf = to_xilinx_spi_conf(core); const u8 din_data[1] = { 0xff }; int ret; ret = spi_write(conf->spi, din_data, sizeof(din_data)); if (ret) - dev_err(&spi->dev, "applying CCLK cycles failed: %d\n", ret); + dev_err(core->dev, "applying CCLK cycles failed: %d\n", ret); return ret; } -static int xilinx_spi_write_complete(struct fpga_manager *mgr, - struct fpga_image_info *info) -{ - struct xilinx_spi_conf *conf = mgr->priv; - unsigned long timeout = jiffies + usecs_to_jiffies(info->config_complete_timeout_us); - bool expired = false; - int done; - int ret; - - /* - * This loop is carefully written such that if the driver is - * scheduled out for more than 'timeout', we still check for DONE - * before giving up and we apply 8 extra CCLK cycles in all cases. - */ - while (!expired) { - expired = time_after(jiffies, timeout); - - done = get_done_gpio(mgr); - if (done < 0) - return done; - - ret = xilinx_spi_apply_cclk_cycles(conf); - if (ret) - return ret; - - if (done) - return 0; - } - - if (conf->init_b) { - ret = gpiod_get_value(conf->init_b); - - if (ret < 0) { - dev_err(&mgr->dev, "Error reading INIT_B (%d)\n", ret); - return ret; - } - - dev_err(&mgr->dev, - ret ? "CRC error or invalid device\n" - : "Missing sync word or incomplete bitstream\n"); - } else { - dev_err(&mgr->dev, "Timeout after config data transfer\n"); - } - - return -ETIMEDOUT; -} - -static const struct fpga_manager_ops xilinx_spi_ops = { - .state = xilinx_spi_state, - .write_init = xilinx_spi_write_init, - .write = xilinx_spi_write, - .write_complete = xilinx_spi_write_complete, -}; - static int xilinx_spi_probe(struct spi_device *spi) { struct xilinx_spi_conf *conf; - struct fpga_manager *mgr; conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL); if (!conf) @@ -231,26 +74,9 @@ static int xilinx_spi_probe(struct spi_device *spi) conf->spi = spi; - /* PROGRAM_B is active low */ - conf->prog_b = devm_gpiod_get(&spi->dev, "prog_b", GPIOD_OUT_LOW); - if (IS_ERR(conf->prog_b)) - return dev_err_probe(&spi->dev, PTR_ERR(conf->prog_b), - "Failed to get PROGRAM_B gpio\n"); - - conf->init_b = devm_gpiod_get_optional(&spi->dev, "init-b", GPIOD_IN); - if (IS_ERR(conf->init_b)) - return dev_err_probe(&spi->dev, PTR_ERR(conf->init_b), - "Failed to get INIT_B gpio\n"); - - conf->done = devm_gpiod_get(&spi->dev, "done", GPIOD_IN); - if (IS_ERR(conf->done)) - return dev_err_probe(&spi->dev, PTR_ERR(conf->done), - "Failed to get DONE gpio\n"); - - mgr = devm_fpga_mgr_register(&spi->dev, - "Xilinx Slave Serial FPGA Manager", - &xilinx_spi_ops, conf); - return PTR_ERR_OR_ZERO(mgr); + return xilinx_core_probe(&conf->core, &spi->dev, + &xilinx_spi_write, + &xilinx_spi_apply_cclk_cycles); } #ifdef CONFIG_OF