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path: root/drivers/char/xillybus/xillybus_pcie.c
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Diffstat (limited to 'drivers/char/xillybus/xillybus_pcie.c')
-rw-r--r--drivers/char/xillybus/xillybus_pcie.c228
1 files changed, 228 insertions, 0 deletions
diff --git a/drivers/char/xillybus/xillybus_pcie.c b/drivers/char/xillybus/xillybus_pcie.c
new file mode 100644
index 000000000000..d8266bc2ae35
--- /dev/null
+++ b/drivers/char/xillybus/xillybus_pcie.c
@@ -0,0 +1,228 @@
+/*
+ * linux/drivers/misc/xillybus_pcie.c
+ *
+ * Copyright 2011 Xillybus Ltd, http://xillybus.com
+ *
+ * Driver for the Xillybus FPGA/host framework using PCI Express.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the smems of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pci-aspm.h>
+#include <linux/slab.h>
+#include "xillybus.h"
+
+MODULE_DESCRIPTION("Xillybus driver for PCIe");
+MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
+MODULE_VERSION("1.06");
+MODULE_ALIAS("xillybus_pcie");
+MODULE_LICENSE("GPL v2");
+
+#define PCI_DEVICE_ID_XILLYBUS 0xebeb
+
+#define PCI_VENDOR_ID_ALTERA 0x1172
+#define PCI_VENDOR_ID_ACTEL 0x11aa
+#define PCI_VENDOR_ID_LATTICE 0x1204
+
+static const char xillyname[] = "xillybus_pcie";
+
+static const struct pci_device_id xillyids[] = {
+ {PCI_DEVICE(PCI_VENDOR_ID_XILINX, PCI_DEVICE_ID_XILLYBUS)},
+ {PCI_DEVICE(PCI_VENDOR_ID_ALTERA, PCI_DEVICE_ID_XILLYBUS)},
+ {PCI_DEVICE(PCI_VENDOR_ID_ACTEL, PCI_DEVICE_ID_XILLYBUS)},
+ {PCI_DEVICE(PCI_VENDOR_ID_LATTICE, PCI_DEVICE_ID_XILLYBUS)},
+ { /* End: all zeroes */ }
+};
+
+static int xilly_pci_direction(int direction)
+{
+ switch (direction) {
+ case DMA_TO_DEVICE:
+ return PCI_DMA_TODEVICE;
+ case DMA_FROM_DEVICE:
+ return PCI_DMA_FROMDEVICE;
+ default:
+ return PCI_DMA_BIDIRECTIONAL;
+ }
+}
+
+static void xilly_dma_sync_single_for_cpu_pci(struct xilly_endpoint *ep,
+ dma_addr_t dma_handle,
+ size_t size,
+ int direction)
+{
+ pci_dma_sync_single_for_cpu(ep->pdev,
+ dma_handle,
+ size,
+ xilly_pci_direction(direction));
+}
+
+static void xilly_dma_sync_single_for_device_pci(struct xilly_endpoint *ep,
+ dma_addr_t dma_handle,
+ size_t size,
+ int direction)
+{
+ pci_dma_sync_single_for_device(ep->pdev,
+ dma_handle,
+ size,
+ xilly_pci_direction(direction));
+}
+
+static void xilly_pci_unmap(void *ptr)
+{
+ struct xilly_mapping *data = ptr;
+
+ pci_unmap_single(data->device, data->dma_addr,
+ data->size, data->direction);
+
+ kfree(ptr);
+}
+
+/*
+ * Map either through the PCI DMA mapper or the non_PCI one. Behind the
+ * scenes exactly the same functions are called with the same parameters,
+ * but that can change.
+ */
+
+static int xilly_map_single_pci(struct xilly_endpoint *ep,
+ void *ptr,
+ size_t size,
+ int direction,
+ dma_addr_t *ret_dma_handle
+ )
+{
+ int pci_direction;
+ dma_addr_t addr;
+ struct xilly_mapping *this;
+ int rc;
+
+ this = kzalloc(sizeof(*this), GFP_KERNEL);
+ if (!this)
+ return -ENOMEM;
+
+ pci_direction = xilly_pci_direction(direction);
+
+ addr = pci_map_single(ep->pdev, ptr, size, pci_direction);
+
+ if (pci_dma_mapping_error(ep->pdev, addr)) {
+ kfree(this);
+ return -ENODEV;
+ }
+
+ this->device = ep->pdev;
+ this->dma_addr = addr;
+ this->size = size;
+ this->direction = pci_direction;
+
+ *ret_dma_handle = addr;
+
+ rc = devm_add_action(ep->dev, xilly_pci_unmap, this);
+ if (rc) {
+ pci_unmap_single(ep->pdev, addr, size, pci_direction);
+ kfree(this);
+ return rc;
+ }
+
+ return 0;
+}
+
+static struct xilly_endpoint_hardware pci_hw = {
+ .owner = THIS_MODULE,
+ .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_pci,
+ .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_pci,
+ .map_single = xilly_map_single_pci,
+};
+
+static int xilly_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ struct xilly_endpoint *endpoint;
+ int rc;
+
+ endpoint = xillybus_init_endpoint(pdev, &pdev->dev, &pci_hw);
+
+ if (!endpoint)
+ return -ENOMEM;
+
+ pci_set_drvdata(pdev, endpoint);
+
+ rc = pcim_enable_device(pdev);
+ if (rc) {
+ dev_err(endpoint->dev,
+ "pcim_enable_device() failed. Aborting.\n");
+ return rc;
+ }
+
+ /* L0s has caused packet drops. No power saving, thank you. */
+
+ pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S);
+
+ if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
+ dev_err(endpoint->dev,
+ "Incorrect BAR configuration. Aborting.\n");
+ return -ENODEV;
+ }
+
+ rc = pcim_iomap_regions(pdev, 0x01, xillyname);
+ if (rc) {
+ dev_err(endpoint->dev,
+ "pcim_iomap_regions() failed. Aborting.\n");
+ return rc;
+ }
+
+ endpoint->registers = pcim_iomap_table(pdev)[0];
+
+ pci_set_master(pdev);
+
+ /* Set up a single MSI interrupt */
+ if (pci_enable_msi(pdev)) {
+ dev_err(endpoint->dev,
+ "Failed to enable MSI interrupts. Aborting.\n");
+ return -ENODEV;
+ }
+ rc = devm_request_irq(&pdev->dev, pdev->irq, xillybus_isr, 0,
+ xillyname, endpoint);
+ if (rc) {
+ dev_err(endpoint->dev,
+ "Failed to register MSI handler. Aborting.\n");
+ return -ENODEV;
+ }
+
+ /*
+ * In theory, an attempt to set the DMA mask to 64 and dma_using_dac=1
+ * is the right thing. But some unclever PCIe drivers report it's OK
+ * when the hardware drops those 64-bit PCIe packets. So trust
+ * nobody and use 32 bits DMA addressing in any case.
+ */
+
+ if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
+ endpoint->dma_using_dac = 0;
+ } else {
+ dev_err(endpoint->dev, "Failed to set DMA mask. Aborting.\n");
+ return -ENODEV;
+ }
+
+ return xillybus_endpoint_discovery(endpoint);
+}
+
+static void xilly_remove(struct pci_dev *pdev)
+{
+ struct xilly_endpoint *endpoint = pci_get_drvdata(pdev);
+
+ xillybus_endpoint_remove(endpoint);
+}
+
+MODULE_DEVICE_TABLE(pci, xillyids);
+
+static struct pci_driver xillybus_driver = {
+ .name = xillyname,
+ .id_table = xillyids,
+ .probe = xilly_probe,
+ .remove = xilly_remove,
+};
+
+module_pci_driver(xillybus_driver);

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