fpga manager: Add Xilinx slave serial SPI driver

The driver loads FPGA firmware over SPI, using the "slave serial"
configuration interface on Xilinx FPGAs.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Moritz Fischer <mdf@kernel.org>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index dee470f..c81cb7d 100644 (file)
--- 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 (file)
--- 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 (file)
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 <agust@denx.de>
+ *
+ * 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 <linux/delay.h>
+#include <linux/device.h>
+#include <linux/fpga/fpga-mgr.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/of.h>
+#include <linux/spi/spi.h>
+#include <linux/sizes.h>
+
+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 <agust@denx.de>");
+MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SPI");