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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: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1789467357224508990 X-GMAIL-MSGID: 1789467357224508990 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 From patchwork Mon Jan 29 22:56:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charles Perry X-Patchwork-Id: 193722 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7301:2087:b0:106:209c:c626 with SMTP id gs7csp876579dyb; Mon, 29 Jan 2024 14:57:06 -0800 (PST) X-Google-Smtp-Source: AGHT+IGT364ZJsoXNBEcXKBwZrghl52EloxGFRAasAhQCyN1DYrlvNF2W95XGyPICDT5lp2kQE1i X-Received: by 2002:a05:620a:2098:b0:783:ddf9:f014 with SMTP id e24-20020a05620a209800b00783ddf9f014mr5629444qka.67.1706569026747; Mon, 29 Jan 2024 14:57:06 -0800 (PST) Received: from ny.mirrors.kernel.org (ny.mirrors.kernel.org. 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Mon, 29 Jan 2024 17:56:19 -0500 (EST) Received: from pcperry.mtl.sfl (unknown [192.168.51.254]) by mail.savoirfairelinux.com (Postfix) with ESMTPSA id 5BA2B9C45C6; Mon, 29 Jan 2024 17:56:19 -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 2/3] dt-bindings: fpga: xlnx,fpga-slave-selectmap: add DT schema Date: Mon, 29 Jan 2024 17:56:01 -0500 Message-ID: <20240129225602.3832449-2-charles.perry@savoirfairelinux.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240129225602.3832449-1-charles.perry@savoirfairelinux.com> References: <20240129225602.3832449-1-charles.perry@savoirfairelinux.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1789467323822868450 X-GMAIL-MSGID: 1789467323822868450 Document the slave SelectMAP interface of Xilinx 7 series FPGA. Signed-off-by: Charles Perry --- .../fpga/xlnx,fpga-slave-selectmap.yaml | 85 +++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 Documentation/devicetree/bindings/fpga/xlnx,fpga-slave-selectmap.yaml diff --git a/Documentation/devicetree/bindings/fpga/xlnx,fpga-slave-selectmap.yaml b/Documentation/devicetree/bindings/fpga/xlnx,fpga-slave-selectmap.yaml new file mode 100644 index 0000000000000..20cea24e3e39a --- /dev/null +++ b/Documentation/devicetree/bindings/fpga/xlnx,fpga-slave-selectmap.yaml @@ -0,0 +1,85 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/fpga/xlnx,fpga-slave-selectmap.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Xilinx Slave SelectMAP FPGA + +description: | + Xilinx 7 Series FPGAs support a method of loading the bitstream over a + parallel port named the slave SelectMAP interface in the documentation Only + the x8 mode is supported where data is loaded at one byte per rising edge of + the clock, with the MSB of each byte presented to the D0 pin. + + Datasheets: + https://www.xilinx.com/support/documentation/user_guides/ug470_7Series_Config.pdf + +properties: + compatible: + enum: + - xlnx,fpga-slave-selectmap + + reg: + description: + At least 1 byte of memory mapped IO + maxItems: 1 + + prog_b-gpios: + description: + config pin (referred to as PROGRAM_B in the manual) + maxItems: 1 + + done-gpios: + description: + config status pin (referred to as DONE in the manual) + maxItems: 1 + + init-b-gpios: + description: + initialization status and configuration error pin + (referred to as INIT_B in the manual) + maxItems: 1 + + csi-b-gpios: + description: + chip select pin (referred to as CSI_B in the manual) + Optional gpio for if the bus controller does not provide a chip select. + maxItems: 1 + + rdwr-b-gpios: + description: + read/write select pin (referred to as RDWR_B in the manual) + Optional gpio for if the bus controller does not provide this pin. + maxItems: 1 + +required: + - compatible + - reg + - prog_b-gpios + - done-gpios + - init-b-gpios + +additionalProperties: true + +examples: + - | + #include + &weim { + status = "okay"; + ranges = <0 0 0x08000000 0x04000000>; + + fpga_mgr: fpga_programmer@0,0 { + compatible = "xlnx,fpga-slave-selectmap"; + reg = <0 0 0x4000000>; + fsl,weim-cs-timing = <0x00070031 0x00000142 + 0x00020000 0x00000000 + 0x0c000645 0x00000000>; + prog_b-gpios = <&gpio5 5 GPIO_ACTIVE_LOW>; + init-b-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>; + done-gpios = <&gpio2 30 GPIO_ACTIVE_HIGH>; + csi-b-gpios = <&gpio3 19 GPIO_ACTIVE_LOW>; + rdwr-b-gpios = <&gpio3 10 GPIO_ACTIVE_LOW>; + }; + }; +... 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Mon, 29 Jan 2024 17:56:19 -0500 (EST) Received: from pcperry.mtl.sfl (unknown [192.168.51.254]) by mail.savoirfairelinux.com (Postfix) with ESMTPSA id D7DAA9C45C6; Mon, 29 Jan 2024 17:56:19 -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 3/3] fpga: xilinx-selectmap: add new driver Date: Mon, 29 Jan 2024 17:56:02 -0500 Message-ID: <20240129225602.3832449-3-charles.perry@savoirfairelinux.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240129225602.3832449-1-charles.perry@savoirfairelinux.com> References: <20240129225602.3832449-1-charles.perry@savoirfairelinux.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1789467331617831001 X-GMAIL-MSGID: 1789467331617831001 Xilinx 7 series FPGA can be programmed using a slave parallel port named the SelectMAP interface in the datasheet. This slave interface is compatible with the i.MX6 EIM bus controller but other types of external memory mapped parallel bus might work. xilinx-selectmap currently only supports the x8 mode where data is loaded at one byte per rising edge of the clock, with the MSb of each byte presented to the D0 pin. The following DT fragment shows a valid configuration on a custom i.MX6 board (pinctrl not shown for readability): &weim { status = "okay"; ranges = <0 0 0x08000000 0x04000000>; fpga_mgr: fpga_programmer@0,0 { compatible = "xlnx,fpga-slave-selectmap"; reg = <0 0 0x4000000>; fsl,weim-cs-timing = <0x00070031 0x00000142 0x00020000 0x00000000 0x0c000645 0x00000000>; prog_b-gpios = <&gpio5 5 GPIO_ACTIVE_LOW>; init-b-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>; done-gpios = <&gpio2 30 GPIO_ACTIVE_HIGH>; csi-b-gpios = <&gpio3 19 GPIO_ACTIVE_LOW>; rdwr-b-gpios = <&gpio3 10 GPIO_ACTIVE_LOW>; }; }; Signed-off-by: Charles Perry --- drivers/fpga/Kconfig | 8 +++ drivers/fpga/Makefile | 1 + drivers/fpga/xilinx-selectmap.c | 100 ++++++++++++++++++++++++++++++++ 3 files changed, 109 insertions(+) create mode 100644 drivers/fpga/xilinx-selectmap.c diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig index d27a1ebf40838..37b35f58f0dfb 100644 --- a/drivers/fpga/Kconfig +++ b/drivers/fpga/Kconfig @@ -67,6 +67,14 @@ config FPGA_MGR_STRATIX10_SOC config FPGA_MGR_XILINX_CORE tristate +config FPGA_MGR_XILINX_SELECTMAP + tristate "Xilinx Configuration over SelectMAP" + depends on HAS_IOMEM + select FPGA_MGR_XILINX_CORE + help + FPGA manager driver support for Xilinx FPGA configuration + over SelectMAP interface. + config FPGA_MGR_XILINX_SPI tristate "Xilinx Configuration over Slave Serial (SPI)" depends on SPI diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile index 7ec795b6a5a70..aeb89bb13517e 100644 --- a/drivers/fpga/Makefile +++ b/drivers/fpga/Makefile @@ -16,6 +16,7 @@ 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-$(CONFIG_FPGA_MGR_XILINX_SELECTMAP) += xilinx-selectmap.o obj-$(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-selectmap.c b/drivers/fpga/xilinx-selectmap.c new file mode 100644 index 0000000000000..e9e522e9952bb --- /dev/null +++ b/drivers/fpga/xilinx-selectmap.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Xilinx Spartan6 and 7 Series Slave SelectMAP Driver + * + * (C) 2024 Charles Perry + * + * Manage Xilinx FPGA firmware loaded over the SelectMAP configuration + * interface. + */ + +#include "xilinx-core.h" + +#include +#include +#include +#include +#include +#include + +struct xilinx_selectmap_conf { + struct xilinx_fpga_core core; + void __iomem *base; + struct gpio_desc *csi_b; + struct gpio_desc *rdwr_b; +}; + +#define to_xilinx_selectmap_conf(obj) \ + container_of(obj, struct xilinx_selectmap_conf, core) + +static int xilinx_selectmap_write(struct xilinx_fpga_core *core, const char *buf, + size_t count) +{ + struct xilinx_selectmap_conf *conf = to_xilinx_selectmap_conf(core); + u32 i; + + for (i = 0; i < count; ++i) + writeb(buf[i], conf->base); + + return 0; +} + +static int xilinx_selectmap_apply_padding(struct xilinx_fpga_core *core) +{ + struct xilinx_selectmap_conf *conf = to_xilinx_selectmap_conf(core); + + writeb(0xFF, conf->base); + return 0; +} + +static int xilinx_selectmap_probe(struct platform_device *pdev) +{ + struct xilinx_selectmap_conf *conf; + struct resource *r; + void __iomem *base; + + conf = devm_kzalloc(&pdev->dev, sizeof(*conf), GFP_KERNEL); + if (!conf) + return -ENOMEM; + + base = devm_platform_get_and_ioremap_resource(pdev, 0, &r); + if (IS_ERR(base)) + return dev_err_probe(&pdev->dev, PTR_ERR(base), "ioremap error\n"); + conf->base = base; + + /* CSI_B is active low */ + conf->csi_b = devm_gpiod_get_optional(&pdev->dev, "csi-b", GPIOD_OUT_HIGH); + if (IS_ERR(conf->csi_b)) + return dev_err_probe(&pdev->dev, PTR_ERR(conf->csi_b), + "Failed to get CSI_B gpio\n"); + + /* RDWR_B is active low */ + conf->rdwr_b = devm_gpiod_get_optional(&pdev->dev, "rdwr-b", GPIOD_OUT_HIGH); + if (IS_ERR(conf->rdwr_b)) + return dev_err_probe(&pdev->dev, PTR_ERR(conf->rdwr_b), + "Failed to get RDWR_B gpio\n"); + + return xilinx_core_probe(&conf->core, &pdev->dev, + xilinx_selectmap_write, + xilinx_selectmap_apply_padding); +} + +static const struct of_device_id xlnx_selectmap_of_match[] = { + { .compatible = "xlnx,fpga-slave-selectmap", }, + {} +}; +MODULE_DEVICE_TABLE(of, xlnx_selectmap_of_match); + +static struct platform_driver xilinx_slave_selectmap_driver = { + .driver = { + .name = "xilinx-slave-selectmap", + .of_match_table = of_match_ptr(xlnx_selectmap_of_match), + }, + .probe = xilinx_selectmap_probe, +}; + +module_platform_driver(xilinx_slave_selectmap_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Charles Perry "); +MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SelectMap");