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Subject[PATCH v2 06/22] fpga: intel: add FPGA PCIe device driver
Date
From: Zhang Yi <yi.z.zhang@intel.com>

The Intel FPGA device appears as a PCIe device on the system. This patch
implements the basic framework of the driver for Intel PCIe device which
locates between CPU and Accelerated Function Units (AFUs).

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: Zhang Yi <yi.z.zhang@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
---
v2: moved the code to drivers/fpga folder as suggested by Alan Tull.
switched to GPLv2 license.
fixed comments from Moritz Fischer.
---
drivers/fpga/Kconfig | 28 +++++++++++
drivers/fpga/Makefile | 5 ++
drivers/fpga/intel-pcie.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 159 insertions(+)
create mode 100644 drivers/fpga/intel-pcie.c

diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index c1d8f41..3f3b7f4 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -117,6 +117,34 @@ config XILINX_PR_DECOUPLER
region of the FPGA from the busses while that region is
being reprogrammed during partial reconfig.

+menuconfig INTEL_FPGA
+ tristate "Intel(R) FPGA support"
+ depends on FPGA_DEVICE
+ help
+ Select this option to enable driver support for Intel(R)
+ Field-Programmable Gate Array (FPGA) solutions. This driver
+ provides interfaces for userspace applications to configure,
+ enumerate, open, and access FPGA accelerators on platforms
+ equipped with Intel(R) FPGA solutions and enables system
+ level management functions such as FPGA reconfiguration,
+ power management, and virtualization.
+
+ Say Y if your platform has this technology. Say N if unsure.
+
+if INTEL_FPGA
+
+config INTEL_FPGA_PCI
+ tristate "Intel FPGA PCIe Driver"
+ depends on PCI
+ help
+ This is the driver for the PCIe device which locates between
+ CPU and Accelerated Function Units (AFUs) and allows them to
+ communicate with each other.
+
+ To compile this as a module, choose M here.
+
+endif
+
endif # FPGA

endmenu
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index 8950a8f..5613133 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -27,3 +27,8 @@ obj-$(CONFIG_XILINX_PR_DECOUPLER) += xilinx-pr-decoupler.o
# High Level Interfaces
obj-$(CONFIG_FPGA_REGION) += fpga-region.o
obj-$(CONFIG_OF_FPGA_REGION) += of-fpga-region.o
+
+# Intel FPGA Support
+obj-$(CONFIG_INTEL_FPGA_PCI) += intel-fpga-pci.o
+
+intel-fpga-pci-objs := intel-pcie.o
diff --git a/drivers/fpga/intel-pcie.c b/drivers/fpga/intel-pcie.c
new file mode 100644
index 0000000..f697de4
--- /dev/null
+++ b/drivers/fpga/intel-pcie.c
@@ -0,0 +1,126 @@
+/*
+ * Driver for Intel FPGA PCIe device
+ *
+ * Copyright (C) 2017 Intel Corporation, Inc.
+ *
+ * Authors:
+ * Zhang Yi <Yi.Z.Zhang@intel.com>
+ * Xiao Guangrong <guangrong.xiao@linux.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>
+ * 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/pci.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/errno.h>
+#include <linux/aer.h>
+
+#define DRV_VERSION "0.8"
+#define DRV_NAME "intel-fpga-pci"
+
+/* PCI Device ID */
+#define PCIe_DEVICE_ID_PF_INT_5_X 0xBCBD
+#define PCIe_DEVICE_ID_PF_INT_6_X 0xBCC0
+#define PCIe_DEVICE_ID_PF_DSC_1_X 0x09C4
+/* VF Device */
+#define PCIe_DEVICE_ID_VF_INT_5_X 0xBCBF
+#define PCIe_DEVICE_ID_VF_INT_6_X 0xBCC1
+#define PCIe_DEVICE_ID_VF_DSC_1_X 0x09C5
+
+static struct pci_device_id cci_pcie_id_tbl[] = {
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIe_DEVICE_ID_PF_INT_5_X),},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIe_DEVICE_ID_VF_INT_5_X),},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIe_DEVICE_ID_PF_INT_6_X),},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIe_DEVICE_ID_VF_INT_6_X),},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIe_DEVICE_ID_PF_DSC_1_X),},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIe_DEVICE_ID_VF_DSC_1_X),},
+ {0,}
+};
+MODULE_DEVICE_TABLE(pci, cci_pcie_id_tbl);
+
+static
+int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
+{
+ int ret;
+
+ ret = pci_enable_device(pcidev);
+ if (ret < 0) {
+ dev_err(&pcidev->dev, "Failed to enable device %d.\n", ret);
+ return ret;
+ }
+
+ ret = pci_enable_pcie_error_reporting(pcidev);
+ if (ret && ret != -EINVAL)
+ dev_info(&pcidev->dev, "PCIE AER unavailable %d.\n", ret);
+
+ ret = pci_request_regions(pcidev, DRV_NAME);
+ if (ret) {
+ dev_err(&pcidev->dev, "Failed to request regions.\n");
+ goto disable_error_report_exit;
+ }
+
+ pci_set_master(pcidev);
+ pci_save_state(pcidev);
+
+ if (!dma_set_mask(&pcidev->dev, DMA_BIT_MASK(64))) {
+ dma_set_coherent_mask(&pcidev->dev, DMA_BIT_MASK(64));
+ } else if (!dma_set_mask(&pcidev->dev, DMA_BIT_MASK(32))) {
+ dma_set_coherent_mask(&pcidev->dev, DMA_BIT_MASK(32));
+ } else {
+ ret = -EIO;
+ dev_err(&pcidev->dev, "No suitable DMA support available.\n");
+ goto release_region_exit;
+ }
+
+ /* TODO: create and add the platform device per feature list */
+ return 0;
+
+release_region_exit:
+ pci_release_regions(pcidev);
+disable_error_report_exit:
+ pci_disable_pcie_error_reporting(pcidev);
+ pci_disable_device(pcidev);
+ return ret;
+}
+
+static void cci_pci_remove(struct pci_dev *pcidev)
+{
+ pci_release_regions(pcidev);
+ pci_disable_pcie_error_reporting(pcidev);
+ pci_disable_device(pcidev);
+}
+
+static struct pci_driver cci_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = cci_pcie_id_tbl,
+ .probe = cci_pci_probe,
+ .remove = cci_pci_remove,
+};
+
+static int __init ccidrv_init(void)
+{
+ pr_info("Intel(R) FPGA PCIe Driver: Version %s\n", DRV_VERSION);
+
+ return pci_register_driver(&cci_pci_driver);
+}
+
+static void __exit ccidrv_exit(void)
+{
+ pci_unregister_driver(&cci_pci_driver);
+}
+
+module_init(ccidrv_init);
+module_exit(ccidrv_exit);
+
+MODULE_DESCRIPTION("Intel FPGA PCIe Device Driver");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
--
1.8.3.1
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