From patchwork Tue Oct 25 05:39:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Bornyakov X-Patchwork-Id: 13018492 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B966CFA373F for ; Tue, 25 Oct 2022 05:41:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230435AbiJYFjr (ORCPT ); Tue, 25 Oct 2022 01:39:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55938 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229682AbiJYFjo (ORCPT ); Tue, 25 Oct 2022 01:39:44 -0400 Received: from mail.pr-group.ru (mail.pr-group.ru [178.18.215.3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DAA5CD56; Mon, 24 Oct 2022 22:39:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=metrotek.ru; s=mail; h=from:subject:date:message-id:to:cc:mime-version:content-transfer-encoding; bh=elLnCkQ0XgUJpT4SZGipJZOUfcDIbY1EsaG1LG2UqTY=; b=ZnH1lhq7ukmz86i2tT+64YdWbjQWTE6x5LhM5HqzxqAlqRwgH6UG82EGqxOSVTLy8AF/TGEqFxWqk 3jsuCBPv3/MrPCZJwvVf3fmzCeDlpeg8WZ5e0eJj+IQ6jAkkr8VgTZlAW/vyQeavCxCNE1C3QGSx8t laBNwUcSVkyREDHYYXSk5uAtzbNQeLrQGNvY3s67pTc14yDHguqaRosNObxHPOiwUB74iKvaP+K/z/ SNrpdEgkhGHCefpFKte89tR0YVZozUFj8ueW+bHufmUVIRguxHX23lF7uLw3jdbD9dDwnGgma59LNS 53s6hkRwOLkwCENeT0gr+w0CZS/6org== X-Kerio-Anti-Spam: Build: [Engines: 2.16.4.1445, Stamp: 3], Multi: [Enabled, t: (0.000010,0.028680)], BW: [Enabled, t: (0.000018,0.000001)], RTDA: [Enabled, t: (0.082340), Hit: No, Details: v2.42.0; Id: 15.52k68k.1gg6qe5sj.fva; mclb], total: 0(700) X-Footer: bWV0cm90ZWsucnU= Received: from localhost.localdomain ([92.100.86.33]) (authenticated user i.bornyakov@metrotek.ru) by mail.pr-group.ru with ESMTPSA (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256 bits)); Tue, 25 Oct 2022 08:39:23 +0300 From: Ivan Bornyakov To: mdf@kernel.org, hao.wu@intel.com, yilun.xu@intel.com, trix@redhat.com, dg@emlix.com, j.zink@pengutronix.de, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org Cc: Ivan Bornyakov , linux-fpga@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de, system@metrotek.ru Subject: [PATCH v20 0/2] Lattice sysCONFIG SPI FPGA manager Date: Tue, 25 Oct 2022 08:39:45 +0300 Message-Id: <20221025053947.2737-1-i.bornyakov@metrotek.ru> X-Mailer: git-send-email 2.37.4 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org Add support to the FPGA manager for programming Lattice ECP5 FPGA over slave SPI sysCONFIG interface. ChangeLog: v1 -> v2: * remove "spi" from compatible string * reword description in dt-bindings doc * add reference to spi-peripheral-props.yaml in dt-binding doc * fix DTS example in dt-bindings doc: 4-spaces indentations, no undersores in node names. v2 -> v3: * fix typo "##size-cells" -> "#size-cells" in dt-bindings example v3 -> v4: * dt-bindings: reword description * dt-bindings: revert props order v4 -> v5: * dt-bindings: remove trailing dot from title * dt-bindings: reword description to avoid driver reference * dt-bindings: add "Reviewed-by: Krzysztof Kozlowski" tag v5 -> v6: * ecp5-spi: lock SPI bus for exclusive usage in ecp5_ops_write_init(), release in ecp5_ops_write_complete() or on error v6 -> v7: * ecp5-spi.c -> lattice-sysconfig-spi.c. Reworked to represent generalized sysCONFIG port with implementations for ECP5 and MachXO2 * lattice,ecp5-fpga-mgr.yaml -> lattice,sysconfig.yaml. Reworked to document both ECP5 and MachXO2 sysCONFIG. * dt-bindings: remove "Reviewed-by: Krzysztof Kozlowski" tag as doc was rewritten by a considerable amount. v7 -> v8: * dt-bindings: move "program-gpios", "init-gpios" and "done-gpios" to top-level properties and disallow them for MachXO2 variant. v8 -> v9: * dt-bindings: "program-gpios", "init-gpios" and "done-gpios" are now optional for both ECP5 and MachXO2 * lattice-sysconfig-spi.c -> sysconfig-spi.c + sysconfig.c + sysconfig.h ** reworked to be one sysCONFIG FPGA Manager rather than two distinct ECP5 and MachXO2 managers ** splitted to port type agnostic sysconfig.c and SPI-specific sysconfig-spi.c ** command transfer function moved to callback for ease of adding another port type, such as I2C v9 -> v10: * split sysconfig_transfer() callback into separate command_write() and command_write_then_read(). There are too many transfers without readback. * add command_write_with_data() callback which performs single transfer of command + data. It's needed for better abstraction of paged bitstream write routine. * move sysconfig_lsc_burst_init() to bitstream_burst_write_init() callback to break dependence of sysconfig.c from sysconfig-spi.c * move sysconfig_lsc_burst_complete() to bitstream_burst_write_complete() callback to break dependence of sysconfig.c from sysconfig-spi.c * add bitstream_burst_write() to abstract fpga_manager_ops->write() from bus type * remove struct spi_device from struct sysconfig_priv, use to_spi_device() * move fpga_manager_ops initialization to sysconfig.c v10 -> v11: * rename sysconfig_lsc_burst_init() to sysconfig_spi_lsc_burst_init() * rename sysconfig_bitstream_burst_write() to sysconfig_spi_bitstream_burst_write() * rename sysconfig_lsc_burst_complete() to sysconfig_spi_lsc_burst_complete() * rename "ecp5-fpga-mgr" to "sysconfig-ecp5" * rename "machxo2-fpga-mgr" to "sysconfig-machxo2" * move spi_max_speed_hz from struct sysconfig_fpga_priv to struct sysconfig_spi_fpga_priv, which is local to sysconfig-spi.c * remove SPI bus unlock on write error form sysconfig_spi_bitstream_burst_write(), call sysconfig_burst_write_complete() on error in sysconfig_bitstream_burst_write() instead. v11 -> v12: * build sysconfig core as separate module to prevent duplication of common code segments across different binaries * rename sysconfig.c to lattice-sysconfig.c * rename sysconfig.h to lattice-sysconfig.h * rename sysconfig-spi.c to lattice-sysconfig-spi.c * rename sysconfig_spi_cmd_write_then_read() to sysconfig_spi_cmd_read() * rename command_write_then_read() callback to command_read() * rename sysconfig_cmd_write_then_read() to sysconfig_cmd_read() * rename sysconfig_spi_lsc_burst_init() to sysconfig_spi_bitstream_burst_init() * rename sysconfig_spi_lsc_burst_complete() to sysconfig_spi_bitstream_burst_complete() * remove excessive !spi check from sysconfig_spi_cmd_write(), sysconfig_spi_cmd_read(), sysconfig_spi_bitstream_burst_init(), sysconfig_spi_bitstream_burst_write() and sysconfig_spi_bitstream_burst_complete() * drop MachXO2 support ** drop struct sysconfig_fpga_priv ** drop paged write ** drop command_write_with_data() and friends ** drop ISC_PROGRAM_DONE routine ** drop refresh from sysconfig_isc_finish() ** sysconfig_isc_erase() only erase SRAM ** drop MachXO2 mentions from DT bindings doc v12 -> v13: * use device_get_match_data() instead of of_device_get_match_data() and drop of_device.h inclusion * in polling routines use time_before(jiffies, timeout) instead of retries count * add usleep_range() to gpio polling routine * check fail status of command in more pronounced way * check definition of sysconfig_priv callbacks at probe * (BIT(23) | BIT(24) | BIT(25)) -> GENMASK(25, 23) v13 -> v14: * return -ETIMEDOUT instead of -EBUSY from sysconfig_poll_busy() to align with sysconfig_poll_gpio() v14 -> v15: * move sysCONFIG commands from stack to heap, as spi-summary doc says: "I/O buffers use the usual Linux rules, and must be DMA-safe. [...] Don't use the stack, or anything that's declared "static"." ** add u8 cmd_tx_buf[4] and u8 cmd_rx_buf[4] to struct sysconfig_priv ** copy commands to cmd_tx_buf before sending to the device ** use cmd_rx_buf for commands readback ** change command_write() and command_read() signatures, as command buffers are now embedded to sysconfig_priv ** combine sysconfig_read_busy() with sysconfig_poll_busy() to avoid same memcpy in the loop v15 -> v16: * revert to v14 * combine command_write() and command_read() to command_transfer() which uses spi_write_then_read() underhood. spi_write_then_read() is dma-safe for on-stack buffers. * in sysconfig_spi_bitstream_burst_init() bounce on-stack buffer with LSC_BITSTREAM_BURST command to the heap. Now everything should be dma-safe. v16 -> v17: * return dev_err_probe() from sysconfig_probe() if devm_gpiod_get_optional() fails v17 -> v18: * use read_poll_timeout() in sysconfig_poll_busy() and sysconfig_poll_gpio() * combine checks for callbacks presence in sysconfig_probe() into one if-statement, add missing check for command_transfer() v18 -> v19: * sysconfig_poll_gpio() improvements: ** replace '(val && is_active) || (!val && !is_active)' with simpler expression '!!val == is_active' ** unfold ternary return v19 -> v20: * replace kmalloc() + memcpy() with kmemdup() Ivan Bornyakov (2): fpga: lattice-sysconfig-spi: add Lattice sysCONFIG FPGA manager dt-bindings: fpga: document Lattice sysCONFIG FPGA manager .../bindings/fpga/lattice,sysconfig.yaml | 81 ++++ drivers/fpga/Kconfig | 11 + drivers/fpga/Makefile | 2 + drivers/fpga/lattice-sysconfig-spi.c | 153 +++++++ drivers/fpga/lattice-sysconfig.c | 397 ++++++++++++++++++ drivers/fpga/lattice-sysconfig.h | 39 ++ 6 files changed, 683 insertions(+) create mode 100644 Documentation/devicetree/bindings/fpga/lattice,sysconfig.yaml create mode 100644 drivers/fpga/lattice-sysconfig-spi.c create mode 100644 drivers/fpga/lattice-sysconfig.c create mode 100644 drivers/fpga/lattice-sysconfig.h