From patchwork Fri Mar 24 00:34:26 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Tull X-Patchwork-Id: 9642175 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 96394601E9 for ; Fri, 24 Mar 2017 00:48:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 86C9128446 for ; Fri, 24 Mar 2017 00:48:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7B73C28460; Fri, 24 Mar 2017 00:48:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4B6572845B for ; Fri, 24 Mar 2017 00:48:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752677AbdCXAsZ (ORCPT ); Thu, 23 Mar 2017 20:48:25 -0400 Received: from [198.145.29.136] ([198.145.29.136]:56140 "EHLO mail.kernel.org" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752412AbdCXAsY (ORCPT ); Thu, 23 Mar 2017 20:48:24 -0400 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2BC69202B8; Fri, 24 Mar 2017 00:34:44 +0000 (UTC) Received: from localhost.localdomain (user-0ccsrjt.cable.mindspring.com [24.206.110.125]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 62669202E9; Fri, 24 Mar 2017 00:34:42 +0000 (UTC) From: Alan Tull To: Greg Kroah-Hartman Cc: Moritz Fischer , Alan Tull , linux-kernel@vger.kernel.org, linux-fpga@vger.kernel.org, Anatolij Gustschin Subject: [PATCH 3/8] fpga manager: Add Xilinx slave serial SPI driver Date: Thu, 23 Mar 2017 19:34:26 -0500 Message-Id: <1490315671-5076-4-git-send-email-atull@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1490315671-5076-1-git-send-email-atull@kernel.org> References: <1490315671-5076-1-git-send-email-atull@kernel.org> X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-fpga-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Anatolij Gustschin The driver loads FPGA firmware over SPI, using the "slave serial" configuration interface on Xilinx FPGAs. Signed-off-by: Anatolij Gustschin Acked-by: Michal Simek Reviewed-by: Moritz Fischer Acked-by: Alan Tull --- drivers/fpga/Kconfig | 7 ++ drivers/fpga/Makefile | 1 + drivers/fpga/xilinx-spi.c | 198 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 206 insertions(+) create mode 100644 drivers/fpga/xilinx-spi.c diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig index dee470f..c81cb7d 100644 --- a/drivers/fpga/Kconfig +++ b/drivers/fpga/Kconfig @@ -46,6 +46,13 @@ config FPGA_MGR_TS73XX FPGA manager driver support for the Altera Cyclone II FPGA present on the TS-73xx SBC boards. +config FPGA_MGR_XILINX_SPI + tristate "Xilinx Configuration over Slave Serial (SPI)" + depends on SPI + help + FPGA manager driver support for Xilinx FPGA configuration + over slave serial interface. + config FPGA_MGR_ZYNQ_FPGA tristate "Xilinx Zynq FPGA" depends on ARCH_ZYNQ || COMPILE_TEST diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile index a5ee3ff..c6f5d74 100644 --- a/drivers/fpga/Makefile +++ b/drivers/fpga/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_FPGA_MGR_ICE40_SPI) += ice40-spi.o obj-$(CONFIG_FPGA_MGR_SOCFPGA) += socfpga.o obj-$(CONFIG_FPGA_MGR_SOCFPGA_A10) += socfpga-a10.o obj-$(CONFIG_FPGA_MGR_TS73XX) += ts73xx-fpga.o +obj-$(CONFIG_FPGA_MGR_XILINX_SPI) += xilinx-spi.o obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA) += zynq-fpga.o # FPGA Bridge Drivers diff --git a/drivers/fpga/xilinx-spi.c b/drivers/fpga/xilinx-spi.c new file mode 100644 index 0000000..9b62a4c --- /dev/null +++ b/drivers/fpga/xilinx-spi.c @@ -0,0 +1,198 @@ +/* + * Xilinx Spartan6 Slave Serial SPI Driver + * + * Copyright (C) 2017 DENX Software Engineering + * + * Anatolij Gustschin + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * Manage Xilinx FPGA firmware that is loaded over SPI using + * the slave serial configuration interface. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct xilinx_spi_conf { + struct spi_device *spi; + struct gpio_desc *prog_b; + struct gpio_desc *done; +}; + +static enum fpga_mgr_states xilinx_spi_state(struct fpga_manager *mgr) +{ + struct xilinx_spi_conf *conf = mgr->priv; + + if (!gpiod_get_value(conf->done)) + return FPGA_MGR_STATE_RESET; + + return FPGA_MGR_STATE_UNKNOWN; +} + +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; + const size_t prog_latency_7500us = 7500; + const size_t prog_pulse_1us = 1; + + 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); + + udelay(prog_pulse_1us); /* min is 500 ns */ + + gpiod_set_value(conf->prog_b, 0); + + if (gpiod_get_value(conf->done)) { + dev_err(&mgr->dev, "Unexpected DONE pin state...\n"); + return -EIO; + } + + /* program latency */ + usleep_range(prog_latency_7500us, prog_latency_7500us + 100); + return 0; +} + +static int xilinx_spi_write(struct fpga_manager *mgr, const char *buf, + size_t count) +{ + struct xilinx_spi_conf *conf = mgr->priv; + const char *fw_data = buf; + const char *fw_data_end = fw_data + count; + + while (fw_data < fw_data_end) { + size_t remaining, stride; + int ret; + + remaining = fw_data_end - fw_data; + stride = min_t(size_t, remaining, SZ_4K); + + ret = spi_write(conf->spi, fw_data, stride); + if (ret) { + dev_err(&mgr->dev, "SPI error in firmware write: %d\n", + ret); + return ret; + } + fw_data += stride; + } + + return 0; +} + +static int xilinx_spi_apply_cclk_cycles(struct xilinx_spi_conf *conf) +{ + struct spi_device *spi = conf->spi; + 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); + + 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; + int ret; + + if (gpiod_get_value(conf->done)) + return xilinx_spi_apply_cclk_cycles(conf); + + timeout = jiffies + usecs_to_jiffies(info->config_complete_timeout_us); + + while (time_before(jiffies, timeout)) { + + ret = xilinx_spi_apply_cclk_cycles(conf); + if (ret) + return ret; + + if (gpiod_get_value(conf->done)) + return xilinx_spi_apply_cclk_cycles(conf); + } + + 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; + + conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL); + if (!conf) + return -ENOMEM; + + 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)) { + dev_err(&spi->dev, "Failed to get PROGRAM_B gpio: %ld\n", + PTR_ERR(conf->prog_b)); + return PTR_ERR(conf->prog_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", + PTR_ERR(conf->done)); + return PTR_ERR(conf->done); + } + + return fpga_mgr_register(&spi->dev, "Xilinx Slave Serial FPGA Manager", + &xilinx_spi_ops, conf); +} + +static int xilinx_spi_remove(struct spi_device *spi) +{ + fpga_mgr_unregister(&spi->dev); + + return 0; +} + +static const struct of_device_id xlnx_spi_of_match[] = { + { .compatible = "xlnx,fpga-slave-serial", }, + {} +}; +MODULE_DEVICE_TABLE(of, xlnx_spi_of_match); + +static struct spi_driver xilinx_slave_spi_driver = { + .driver = { + .name = "xlnx-slave-spi", + .of_match_table = of_match_ptr(xlnx_spi_of_match), + }, + .probe = xilinx_spi_probe, + .remove = xilinx_spi_remove, +}; + +module_spi_driver(xilinx_slave_spi_driver) + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Anatolij Gustschin "); +MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SPI");