FPGA: Add TS-7300 FPGA manager

Add support for loading bitstreams on the Altera Cyclone II FPGA
populated on the TS-7300 board. This is done through the configuration
and data registers offered through a memory interface between the EP93xx
SoC and the FPGA via an intermediate CPLD device.

The EP93xx SoC on the TS-7300 does not have direct means of configuring
the on-board FPGA other than by using the special memory mapped
interface to the CPLD. No other entity on the system can control the
FPGA bitstream.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Alan Tull <atull@opensource.altera.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index ce861a2..d9cbef6 100644 (file)
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -33,6 +33,13 @@ config FPGA_MGR_SOCFPGA_A10
        help
          FPGA manager driver support for Altera Arria10 SoCFPGA.
 
+config FPGA_MGR_TS73XX
+       tristate "Technologic Systems TS-73xx SBC FPGA Manager"
+       depends on ARCH_EP93XX && MACH_TS72XX
+       help
+         FPGA manager driver support for the Altera Cyclone II FPGA
+         present on the TS-73xx SBC boards.
+
 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 8df07bc..a116016 100644 (file)
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_FPGA)                      += fpga-mgr.o
 # FPGA Manager Drivers
 obj-$(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_ZYNQ_FPGA)       += zynq-fpga.o
 
 # FPGA Bridge Drivers

diff --git a/drivers/fpga/ts73xx-fpga.c b/drivers/fpga/ts73xx-fpga.c
new file mode 100644 (file)
index 0000000..f6a96b4
--- /dev/null
+++ b/drivers/fpga/ts73xx-fpga.c
@@ -0,0 +1,156 @@
+/*
+ * Technologic Systems TS-73xx SBC FPGA loader
+ *
+ * Copyright (C) 2016 Florian Fainelli <f.fainelli@gmail.com>
+ *
+ * FPGA Manager Driver for the on-board Altera Cyclone II FPGA found on
+ * TS-7300, heavily based on load_fpga.c in their vendor tree.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+#include <linux/iopoll.h>
+#include <linux/fpga/fpga-mgr.h>
+
+#define TS73XX_FPGA_DATA_REG           0
+#define TS73XX_FPGA_CONFIG_REG         1
+
+#define TS73XX_FPGA_WRITE_DONE         0x1
+#define TS73XX_FPGA_WRITE_DONE_TIMEOUT 1000    /* us */
+#define TS73XX_FPGA_RESET              0x2
+#define TS73XX_FPGA_RESET_LOW_DELAY    30      /* us */
+#define TS73XX_FPGA_RESET_HIGH_DELAY   80      /* us */
+#define TS73XX_FPGA_LOAD_OK            0x4
+#define TS73XX_FPGA_CONFIG_LOAD                0x8
+
+struct ts73xx_fpga_priv {
+       void __iomem    *io_base;
+       struct device   *dev;
+};
+
+static enum fpga_mgr_states ts73xx_fpga_state(struct fpga_manager *mgr)
+{
+       return FPGA_MGR_STATE_UNKNOWN;
+}
+
+static int ts73xx_fpga_write_init(struct fpga_manager *mgr,
+                                 struct fpga_image_info *info,
+                                 const char *buf, size_t count)
+{
+       struct ts73xx_fpga_priv *priv = mgr->priv;
+
+       /* Reset the FPGA */
+       writeb(0, priv->io_base + TS73XX_FPGA_CONFIG_REG);
+       udelay(TS73XX_FPGA_RESET_LOW_DELAY);
+       writeb(TS73XX_FPGA_RESET, priv->io_base + TS73XX_FPGA_CONFIG_REG);
+       udelay(TS73XX_FPGA_RESET_HIGH_DELAY);
+
+       return 0;
+}
+
+static int ts73xx_fpga_write(struct fpga_manager *mgr, const char *buf,
+                            size_t count)
+{
+       struct ts73xx_fpga_priv *priv = mgr->priv;
+       size_t i = 0;
+       int ret;
+       u8 reg;
+
+       while (count--) {
+               ret = readb_poll_timeout(priv->io_base + TS73XX_FPGA_CONFIG_REG,
+                                        reg, !(reg & TS73XX_FPGA_WRITE_DONE),
+                                        1, TS73XX_FPGA_WRITE_DONE_TIMEOUT);
+               if (ret < 0)
+                       return ret;
+
+               writeb(buf[i], priv->io_base + TS73XX_FPGA_DATA_REG);
+               i++;
+       }
+
+       return 0;
+}
+
+static int ts73xx_fpga_write_complete(struct fpga_manager *mgr,
+                                     struct fpga_image_info *info)
+{
+       struct ts73xx_fpga_priv *priv = mgr->priv;
+       u8 reg;
+
+       usleep_range(1000, 2000);
+       reg = readb(priv->io_base + TS73XX_FPGA_CONFIG_REG);
+       reg |= TS73XX_FPGA_CONFIG_LOAD;
+       writeb(reg, priv->io_base + TS73XX_FPGA_CONFIG_REG);
+
+       usleep_range(1000, 2000);
+       reg = readb(priv->io_base + TS73XX_FPGA_CONFIG_REG);
+       reg &= ~TS73XX_FPGA_CONFIG_LOAD;
+       writeb(reg, priv->io_base + TS73XX_FPGA_CONFIG_REG);
+
+       reg = readb(priv->io_base + TS73XX_FPGA_CONFIG_REG);
+       if ((reg & TS73XX_FPGA_LOAD_OK) != TS73XX_FPGA_LOAD_OK)
+               return -ETIMEDOUT;
+
+       return 0;
+}
+
+static const struct fpga_manager_ops ts73xx_fpga_ops = {
+       .state          = ts73xx_fpga_state,
+       .write_init     = ts73xx_fpga_write_init,
+       .write          = ts73xx_fpga_write,
+       .write_complete = ts73xx_fpga_write_complete,
+};
+
+static int ts73xx_fpga_probe(struct platform_device *pdev)
+{
+       struct device *kdev = &pdev->dev;
+       struct ts73xx_fpga_priv *priv;
+       struct resource *res;
+
+       priv = devm_kzalloc(kdev, sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       priv->dev = kdev;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       priv->io_base = devm_ioremap_resource(kdev, res);
+       if (IS_ERR(priv->io_base)) {
+               dev_err(kdev, "unable to remap registers\n");
+               return PTR_ERR(priv->io_base);
+       }
+
+       return fpga_mgr_register(kdev, "TS-73xx FPGA Manager",
+                                &ts73xx_fpga_ops, priv);
+}
+
+static int ts73xx_fpga_remove(struct platform_device *pdev)
+{
+       fpga_mgr_unregister(&pdev->dev);
+
+       return 0;
+}
+
+static struct platform_driver ts73xx_fpga_driver = {
+       .driver = {
+               .name   = "ts73xx-fpga-mgr",
+       },
+       .probe  = ts73xx_fpga_probe,
+       .remove = ts73xx_fpga_remove,
+};
+module_platform_driver(ts73xx_fpga_driver);
+
+MODULE_AUTHOR("Florian Fainelli <f.fainelli@gmail.com>");
+MODULE_DESCRIPTION("TS-73xx FPGA Manager driver");
+MODULE_LICENSE("GPL v2");