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Subject[PATCH v2 15/22] fpga: intel: add fpga manager platform driver for FME
Date
This patch adds fpga manager driver for Intel FPGA Management
Engine(FME). It implements fpga_manager_ops for FPGA Partial
Reconfiguration function.

Signed-off-by: Tim Whisonant <tim.whisonant@intel.com>
Signed-off-by: Enno Luebbers <enno.luebbers@intel.com>
Signed-off-by: Shiva Rao <shiva.rao@intel.com>
Signed-off-by: Christopher Rauer <christopher.rauer@intel.com>
Signed-off-by: Kang Luwei <luwei.kang@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
---
.../ABI/testing/sysfs-platform-intel-fpga-fme-mgr | 8 +
drivers/fpga/Kconfig | 7 +
drivers/fpga/Makefile | 1 +
drivers/fpga/intel-feature-dev.h | 75 +++++
drivers/fpga/intel-fpga-fme-mgr.c | 307 +++++++++++++++++++++
5 files changed, 398 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-platform-intel-fpga-fme-mgr
create mode 100644 drivers/fpga/intel-fpga-fme-mgr.c

diff --git a/Documentation/ABI/testing/sysfs-platform-intel-fpga-fme-mgr b/Documentation/ABI/testing/sysfs-platform-intel-fpga-fme-mgr
new file mode 100644
index 0000000..40771fb
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-intel-fpga-fme-mgr
@@ -0,0 +1,8 @@
+What: /sys/bus/platform/devices/intel-fpga-fme-mgr.0/interface_id
+Date: June 2017
+KernelVersion: 4.12
+Contact: Wu Hao <hao.wu@intel.com>
+Description: Read-only. It returns interface id of partial reconfiguration
+ hardware. Userspace could use this information to check if
+ current hardware is compatible with given image before FPGA
+ programming.
diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index b91458f..6f2f623 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -151,6 +151,13 @@ config INTEL_FPGA_FME
all FPGA platform level management features. There shall be 1
FME per Intel FPGA.

+config INTEL_FPGA_FME_MGR
+ tristate "Intel FPGA FME Manager Driver"
+ depends on INTEL_FPGA_FME
+ help
+ Say Y to enable FPGA Manager driver for Intel FPGA Management
+ Engine.
+
endif

endif # FPGA
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index acda5ca..d1d588b 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_OF_FPGA_REGION) += of-fpga-region.o
# Intel FPGA Support
obj-$(CONFIG_INTEL_FPGA_PCI) += intel-fpga-pci.o
obj-$(CONFIG_INTEL_FPGA_FME) += intel-fpga-fme.o
+obj-$(CONFIG_INTEL_FPGA_FME_MGR) += intel-fpga-fme-mgr.o

intel-fpga-pci-objs := intel-pcie.o intel-feature-dev.o
intel-fpga-fme-objs := intel-fme-main.o intel-fme-pr.o
diff --git a/drivers/fpga/intel-feature-dev.h b/drivers/fpga/intel-feature-dev.h
index 3f97b75..f33923b 100644
--- a/drivers/fpga/intel-feature-dev.h
+++ b/drivers/fpga/intel-feature-dev.h
@@ -164,8 +164,83 @@ struct feature_fme_err {
};

/* FME Partial Reconfiguration Sub Feature Register Set */
+/* FME PR Control Register */
+struct feature_fme_pr_ctl {
+ union {
+ u64 csr;
+ struct {
+ u64 pr_reset:1; /* Reset PR Engine */
+ u64 rsvdz1:3;
+ u64 pr_reset_ack:1; /* Reset PR Engine Ack */
+ u64 rsvdz2:3;
+ u64 pr_regionid:2; /* PR Region ID */
+ u64 rsvdz3:2;
+ u64 pr_start_req:1; /* PR Start Request */
+ u64 pr_push_complete:1; /* PR Data push complete */
+ u64 pr_kind:1; /* Load Customer or Intel GBS */
+ u64 rsvdz4:17;
+ u64 config_data:32;
+ };
+ };
+};
+
+/* FME PR Status Register */
+struct feature_fme_pr_status {
+ union {
+ u64 csr;
+ struct {
+ u64 pr_credit:9; /* Number of PR Credits */
+ u64 rsvdz1:7;
+ u64 pr_status:1; /* PR Operation status */
+ u64 rsvdz2:3;
+ u64 pr_ctrlr_status:3; /* Controller status */
+ u64 rsvdz3:1;
+ u64 pr_host_status:4; /* PR Host status */
+ u64 rsvdz4:36;
+ };
+ };
+};
+
+/* FME PR Data Register */
+struct feature_fme_pr_data {
+ union {
+ u64 csr;
+ struct {
+ /* PR data from the raw-binary file */
+ u64 pr_data_raw:32;
+ u64 rsvd:32;
+ };
+ };
+};
+
+/* FME PR Error Register */
+struct feature_fme_pr_error {
+ union {
+ u64 csr;
+ struct {
+ u64 operation_err:1; /* Previous PR error detected */
+ u64 crc_err:1; /* CRC error detected */
+ u64 incompatiable_bs:1; /* Incompatiable Bitstream */
+ u64 protocol_err:1; /* Data push protocol error */
+ u64 fifo_overflow:1; /* Data fifo overflow */
+ u64 rsvdz1:1;
+ u64 secure_load_err:1; /* Secure PR load error */
+ u64 rsvdz2:57;
+ };
+ };
+};
+
struct feature_fme_pr {
struct feature_header header;
+ struct feature_fme_pr_ctl control;
+ struct feature_fme_pr_status status;
+ struct feature_fme_pr_data data;
+ struct feature_fme_pr_error error;
+
+ u64 rsvd[16];
+
+ u64 intfc_id_l; /* PR interface Id Low */
+ u64 intfc_id_h; /* PR interface Id High */
};

/* PORT Header Register Set */
diff --git a/drivers/fpga/intel-fpga-fme-mgr.c b/drivers/fpga/intel-fpga-fme-mgr.c
new file mode 100644
index 0000000..5f93dfb
--- /dev/null
+++ b/drivers/fpga/intel-fpga-fme-mgr.c
@@ -0,0 +1,307 @@
+/*
+ * FPGA Manager Driver for Intel FPGA Management Engine (FME)
+ *
+ * Copyright (C) 2017 Intel Corporation, Inc.
+ *
+ * Authors:
+ * Kang Luwei <luwei.kang@intel.com>
+ * Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ * Wu Hao <hao.wu@intel.com>
+ * Joseph Grecco <joe.grecco@intel.com>
+ * Enno Luebbers <enno.luebbers@intel.com>
+ * Tim Whisonant <tim.whisonant@intel.com>
+ * Ananda Ravuri <ananda.ravuri@intel.com>
+ * Christopher Rauer <christopher.rauer@intel.com>
+ * Henry Mitchel <henry.mitchel@intel.com>
+ *
+ * This work is licensed under the terms of the GNU GPL version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#include <linux/module.h>
+#include <linux/iopoll.h>
+#include <linux/fpga/fpga-mgr.h>
+
+#include "intel-feature-dev.h"
+#include "intel-fme.h"
+
+#define PR_WAIT_TIMEOUT 8000000
+#define PR_HOST_STATUS_IDLE 0
+
+struct fme_mgr_priv {
+ void __iomem *ioaddr;
+};
+
+static ssize_t interface_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct fpga_manager *mgr = dev_get_drvdata(dev);
+ struct fme_mgr_priv *priv = mgr->priv;
+ struct feature_fme_pr *fme_pr;
+ u64 intfc_id_l, intfc_id_h;
+
+ fme_pr = priv->ioaddr;
+
+ intfc_id_l = readq(&fme_pr->intfc_id_l);
+ intfc_id_h = readq(&fme_pr->intfc_id_h);
+
+ return scnprintf(buf, PAGE_SIZE, "%016llx%016llx\n",
+ (unsigned long long)intfc_id_h,
+ (unsigned long long)intfc_id_l);
+}
+static DEVICE_ATTR_RO(interface_id);
+
+static const struct attribute *fme_mgr_attrs[] = {
+ &dev_attr_interface_id.attr,
+ NULL,
+};
+
+static void fme_mgr_pr_update_status(struct fpga_manager *mgr,
+ struct feature_fme_pr_error err)
+{
+ mgr->status = 0;
+
+ if (err.operation_err)
+ mgr->status |= FPGA_MGR_STATUS_OPERATION_ERR;
+ if (err.crc_err)
+ mgr->status |= FPGA_MGR_STATUS_CRC_ERR;
+ if (err.incompatiable_bs)
+ mgr->status |= FPGA_MGR_STATUS_INCOMPATIBLE_BS_ERR;
+ if (err.protocol_err)
+ mgr->status |= FPGA_MGR_STATUS_IP_PROTOCOL_ERR;
+ if (err.fifo_overflow)
+ mgr->status |= FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR;
+ if (err.secure_load_err)
+ mgr->status |= FPGA_MGR_STATUS_SECURE_LOAD_ERR;
+}
+
+static u64 fme_mgr_pr_err_handle(struct feature_fme_pr *fme_pr)
+{
+ struct feature_fme_pr_status fme_pr_status;
+ struct feature_fme_pr_error fme_pr_error;
+
+ fme_pr_status.csr = readq(&fme_pr->status);
+ if (!fme_pr_status.pr_status)
+ return 0;
+
+ fme_pr_error.csr = readq(&fme_pr->error);
+ writeq(fme_pr_error.csr, &fme_pr->error);
+
+ return fme_pr_error.csr;
+}
+
+static int fme_mgr_write_init(struct fpga_manager *mgr,
+ struct fpga_image_info *info,
+ const char *buf, size_t count)
+{
+ struct device *dev = &mgr->dev;
+ struct fme_mgr_priv *priv = mgr->priv;
+ struct feature_fme_pr *fme_pr = priv->ioaddr;
+ struct feature_fme_pr_ctl fme_pr_ctl;
+ struct feature_fme_pr_status fme_pr_status;
+ struct feature_fme_pr_error fme_pr_err;
+
+ if (!(info->flags & FPGA_MGR_PARTIAL_RECONFIG)) {
+ dev_err(dev, "only support partial reconfiguration.\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "resetting PR before initiated PR\n");
+
+ fme_pr_ctl.csr = readq(&fme_pr->control);
+ fme_pr_ctl.pr_reset = 1;
+ writeq(fme_pr_ctl.csr, &fme_pr->control);
+
+ if (readq_poll_timeout(&fme_pr->control, fme_pr_ctl.csr,
+ (fme_pr_ctl.pr_reset_ack == 1),
+ 1, PR_WAIT_TIMEOUT)) {
+ dev_err(dev, "maximum PR timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ fme_pr_ctl.csr = readq(&fme_pr->control);
+ fme_pr_ctl.pr_reset = 0;
+ writeq(fme_pr_ctl.csr, &fme_pr->control);
+
+ dev_dbg(dev,
+ "waiting for PR resource in HW to be initialized and ready\n");
+
+ fme_pr_status.pr_host_status = PR_HOST_STATUS_IDLE;
+
+ if (readq_poll_timeout(&fme_pr->status, fme_pr_status.csr,
+ (fme_pr_status.pr_host_status == PR_HOST_STATUS_IDLE),
+ 1, PR_WAIT_TIMEOUT)) {
+ dev_err(dev, "maximum PR timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ dev_dbg(dev, "check and clear previous PR error\n");
+ fme_pr_err.csr = fme_mgr_pr_err_handle(fme_pr);
+ if (fme_pr_err.csr)
+ dev_dbg(dev, "previous PR error detected %llx\n",
+ (unsigned long long)fme_pr_err.csr);
+
+ /* Clear all PR errors */
+ fme_pr_err.csr = 0;
+ fme_mgr_pr_update_status(mgr, fme_pr_err);
+
+ dev_dbg(dev, "set PR port ID\n");
+
+ fme_pr_ctl.csr = readq(&fme_pr->control);
+ fme_pr_ctl.pr_regionid = info->region_id;
+ writeq(fme_pr_ctl.csr, &fme_pr->control);
+
+ return 0;
+}
+
+static int fme_mgr_write(struct fpga_manager *mgr,
+ const char *buf, size_t count)
+{
+ struct device *dev = &mgr->dev;
+ struct fme_mgr_priv *priv = mgr->priv;
+ struct feature_fme_pr *fme_pr = priv->ioaddr;
+ struct feature_fme_pr_ctl fme_pr_ctl;
+ struct feature_fme_pr_status fme_pr_status;
+ struct feature_fme_pr_data fme_pr_data;
+ int delay, pr_credit, i = 0;
+
+ dev_dbg(dev, "start request\n");
+
+ fme_pr_ctl.csr = readq(&fme_pr->control);
+ fme_pr_ctl.pr_start_req = 1;
+ writeq(fme_pr_ctl.csr, &fme_pr->control);
+
+ dev_dbg(dev, "pushing data from bitstream to HW\n");
+
+ fme_pr_status.csr = readq(&fme_pr->status);
+ pr_credit = fme_pr_status.pr_credit;
+
+ while (count > 0) {
+ delay = 0;
+ while (pr_credit <= 1) {
+ if (delay++ > PR_WAIT_TIMEOUT) {
+ dev_err(dev, "maximum try\n");
+ return -ETIMEDOUT;
+ }
+ udelay(1);
+
+ fme_pr_status.csr = readq(&fme_pr->status);
+ pr_credit = fme_pr_status.pr_credit;
+ };
+
+ if (count >= 4) {
+ fme_pr_data.rsvd = 0;
+ fme_pr_data.pr_data_raw = *(((u32 *)buf) + i);
+ writeq(fme_pr_data.csr, &fme_pr->data);
+ count -= 4;
+ pr_credit--;
+ i++;
+ } else {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int fme_mgr_write_complete(struct fpga_manager *mgr,
+ struct fpga_image_info *info)
+{
+ struct device *dev = &mgr->dev;
+ struct fme_mgr_priv *priv = mgr->priv;
+ struct feature_fme_pr *fme_pr = priv->ioaddr;
+ struct feature_fme_pr_ctl fme_pr_ctl;
+ struct feature_fme_pr_error fme_pr_err;
+
+ fme_pr_ctl.csr = readq(&fme_pr->control);
+ fme_pr_ctl.pr_push_complete = 1;
+ writeq(fme_pr_ctl.csr, &fme_pr->control);
+
+ dev_dbg(dev, "green bitstream push complete\n");
+ dev_dbg(dev, "waiting for HW to release PR resource\n");
+
+ fme_pr_ctl.pr_start_req = 0;
+
+ if (readq_poll_timeout(&fme_pr->control, fme_pr_ctl.csr,
+ (fme_pr_ctl.pr_start_req == 0),
+ 1, PR_WAIT_TIMEOUT)) {
+ dev_err(dev, "maximum try.\n");
+ return -ETIMEDOUT;
+ }
+
+ dev_dbg(dev, "PR operation complete, checking status\n");
+ fme_pr_err.csr = fme_mgr_pr_err_handle(fme_pr);
+ if (fme_pr_err.csr) {
+ fme_mgr_pr_update_status(mgr, fme_pr_err);
+ return -EIO;
+ }
+
+ dev_dbg(dev, "PR done successfully\n");
+ return 0;
+}
+
+static enum fpga_mgr_states fme_mgr_state(struct fpga_manager *mgr)
+{
+ return FPGA_MGR_STATE_UNKNOWN;
+}
+
+static const struct fpga_manager_ops fme_mgr_ops = {
+ .write_init = fme_mgr_write_init,
+ .write = fme_mgr_write,
+ .write_complete = fme_mgr_write_complete,
+ .state = fme_mgr_state,
+};
+
+static int fme_mgr_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct fme_mgr_priv *priv;
+ struct resource *res;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->ioaddr = devm_ioremap(dev, res->start, resource_size(res));
+ if (IS_ERR(priv->ioaddr))
+ return PTR_ERR(priv->ioaddr);
+
+ ret = sysfs_create_files(&pdev->dev.kobj, fme_mgr_attrs);
+ if (ret)
+ return ret;
+
+ ret = fpga_mgr_register(dev, "Intel FPGA Manager", &fme_mgr_ops, priv);
+ if (ret) {
+ dev_err(dev, "unable to register FPGA manager\n");
+ sysfs_remove_files(&pdev->dev.kobj, fme_mgr_attrs);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int fme_mgr_remove(struct platform_device *pdev)
+{
+ fpga_mgr_unregister(&pdev->dev);
+ sysfs_remove_files(&pdev->dev.kobj, fme_mgr_attrs);
+
+ return 0;
+}
+
+static struct platform_driver fme_mgr_driver = {
+ .driver = {
+ .name = INTEL_FPGA_FME_MGR,
+ },
+ .probe = fme_mgr_probe,
+ .remove = fme_mgr_remove,
+};
+
+module_platform_driver(fme_mgr_driver);
+
+MODULE_DESCRIPTION("FPGA Manager for Intel FPGA Management Engine");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:intel-fpga-fme-mgr");
--
1.8.3.1
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