--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/devices/ccat/module.c	Fri Apr 25 16:42:36 2014 +0200
@@ -0,0 +1,306 @@
+/**
+    Network Driver for Beckhoff CCAT communication controller
+    Copyright (C) 2014  Beckhoff Automation GmbH
+    Author: Patrick Bruenn <p.bruenn@beckhoff.com>
+
+    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; either version 2 of the License, or
+    (at your option) any later version.
+
+    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.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <asm/dma.h>
+#include <linux/etherdevice.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include "compat.h"
+#include "module.h"
+#include "netdev.h"
+#include "update.h"
+
+MODULE_DESCRIPTION(DRV_DESCRIPTION);
+MODULE_AUTHOR("Patrick Bruenn <p.bruenn@beckhoff.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+static void ccat_bar_free(struct ccat_bar *bar)
+{
+	if (bar->ioaddr) {
+		const struct ccat_bar tmp = *bar;
+		memset(bar, 0, sizeof(*bar));
+		iounmap(tmp.ioaddr);
+		release_mem_region(tmp.start, tmp.len);
+	} else {
+		pr_warn("%s(): %p was already done.\n", __FUNCTION__, bar);
+	}
+}
+
+/**
+ * ccat_bar_init() - Initialize a CCAT pci bar
+ * @bar object which should be initialized
+ * @index 0 and 2 are valid for CCAT, meaning pci bar0 or pci bar2
+ * @pdev the pci device as which the CCAT was recognized before
+ *
+ * Reading PCI config space; request and map memory region.
+ */
+static int ccat_bar_init(struct ccat_bar *bar, size_t index,
+			 struct pci_dev *pdev)
+{
+	struct resource *res;
+	bar->start = pci_resource_start(pdev, index);
+	bar->end = pci_resource_end(pdev, index);
+	bar->len = pci_resource_len(pdev, index);
+	bar->flags = pci_resource_flags(pdev, index);
+	if (!(IORESOURCE_MEM & bar->flags)) {
+		pr_info("bar%llu is no mem_region -> abort.\n",
+			(uint64_t) index);
+		return -EIO;
+	}
+
+	res = request_mem_region(bar->start, bar->len, DRV_NAME);
+	if (!res) {
+		pr_info("allocate mem_region failed.\n");
+		return -EIO;
+	}
+	pr_debug("bar%llu at [%lx,%lx] len=%lu res: %p.\n", (uint64_t) index,
+		 bar->start, bar->end, bar->len, res);
+
+	bar->ioaddr = ioremap(bar->start, bar->len);
+	if (!bar->ioaddr) {
+		pr_info("bar%llu ioremap failed.\n", (uint64_t) index);
+		release_mem_region(bar->start, bar->len);
+		return -EIO;
+	}
+	pr_debug("bar%llu I/O mem mapped to %p.\n", (uint64_t) index,
+		 bar->ioaddr);
+	return 0;
+}
+
+void ccat_dma_free(struct ccat_dma *const dma)
+{
+	const struct ccat_dma tmp = *dma;
+	free_dma(dma->channel);
+	memset(dma, 0, sizeof(*dma));
+	dma_free_coherent(tmp.dev, tmp.size, tmp.virt, tmp.phys);
+}
+
+/**
+ * ccat_dma_init() - Initialize CCAT and host memory for DMA transfer
+ * @dma object for management data which will be initialized
+ * @channel number of the DMA channel
+ * @ioaddr of the pci bar2 configspace used to calculate the address of the pci dma configuration
+ * @dev which should be configured for DMA
+ */
+int ccat_dma_init(struct ccat_dma *const dma, size_t channel,
+		  void __iomem * const ioaddr, struct device *const dev)
+{
+	void *frame;
+	uint64_t addr;
+	uint32_t translateAddr;
+	uint32_t memTranslate;
+	uint32_t memSize;
+	uint32_t data = 0xffffffff;
+	uint32_t offset = (sizeof(uint64_t) * channel) + 0x1000;
+
+	dma->channel = channel;
+	dma->dev = dev;
+
+	/* calculate size and alignments */
+	iowrite32(data, ioaddr + offset);
+	wmb();
+	data = ioread32(ioaddr + offset);
+	memTranslate = data & 0xfffffffc;
+	memSize = (~memTranslate) + 1;
+	dma->size = 2 * memSize - PAGE_SIZE;
+	dma->virt = dma_zalloc_coherent(dev, dma->size, &dma->phys, GFP_KERNEL);
+	if (!dma->virt || !dma->phys) {
+		pr_info("init DMA%llu memory failed.\n", (uint64_t) channel);
+		return -1;
+	}
+
+	if (request_dma(channel, DRV_NAME)) {
+		pr_info("request dma channel %llu failed\n",
+			(uint64_t) channel);
+		ccat_dma_free(dma);
+		return -1;
+	}
+
+	translateAddr = (dma->phys + memSize - PAGE_SIZE) & memTranslate;
+	addr = translateAddr;
+	memcpy_toio(ioaddr + offset, &addr, sizeof(addr));
+	frame = dma->virt + translateAddr - dma->phys;
+	pr_debug
+	    ("DMA%llu mem initialized\n virt:         0x%p\n phys:         0x%llx\n translated:   0x%llx\n pci addr:     0x%08x%x\n memTranslate: 0x%x\n size:         %llu bytes.\n",
+	     (uint64_t) channel, dma->virt, (uint64_t) (dma->phys), addr,
+	     ioread32(ioaddr + offset + 4), ioread32(ioaddr + offset),
+	     memTranslate, (uint64_t) dma->size);
+	return 0;
+}
+
+/**
+ * Initialize all available CCAT functions.
+ *
+ * Return: count of failed functions
+ */
+static int ccat_functions_init(struct ccat_device *const ccatdev)
+{
+	/* read CCatInfoBlock.nMaxEntries from ccat */
+	const uint8_t num_func = ioread8(ccatdev->bar[0].ioaddr + 4);
+	void __iomem *addr = ccatdev->bar[0].ioaddr;
+	const void __iomem *end = addr + (sizeof(CCatInfoBlock) * num_func);
+	int status = 0;		//count init function failures
+
+	while (addr < end) {
+		const uint8_t type = ioread16(addr);
+		switch (type) {
+		case CCATINFO_NOTUSED:
+			break;
+		case CCATINFO_EPCS_PROM:
+			pr_info("Found: CCAT update(EPCS_PROM) -> init()\n");
+			ccatdev->update = ccat_update_init(ccatdev, addr);
+			status += (NULL == ccatdev->update);
+			break;
+		case CCATINFO_ETHERCAT_MASTER_DMA:
+			pr_info("Found: ETHERCAT_MASTER_DMA -> init()\n");
+			ccatdev->ethdev = ccat_eth_init(ccatdev, addr);
+			status += (NULL == ccatdev->ethdev);
+			break;
+		default:
+			pr_info("Found: 0x%04x not supported\n", type);
+			break;
+		}
+		addr += sizeof(CCatInfoBlock);
+	}
+	return status;
+}
+
+/**
+ * Destroy all previously initialized CCAT functions
+ */
+static void ccat_functions_remove(struct ccat_device *const ccatdev)
+{
+	if (!ccatdev->ethdev) {
+		pr_warn("%s(): 'ethdev' was not initialized.\n", __FUNCTION__);
+	} else {
+		struct ccat_eth_priv *const ethdev = ccatdev->ethdev;
+		ccatdev->ethdev = NULL;
+		ccat_eth_remove(ethdev);
+	}
+	if (!ccatdev->update) {
+		pr_warn("%s(): 'update' was not initialized.\n", __FUNCTION__);
+	} else {
+		struct ccat_update *const update = ccatdev->update;
+		ccatdev->update = NULL;
+		ccat_update_remove(update);
+	}
+}
+
+static int ccat_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	int status;
+	u8 revision;
+	struct ccat_device *ccatdev = kmalloc(sizeof(*ccatdev), GFP_KERNEL);
+	if (!ccatdev) {
+		pr_err("%s() out of memory.\n", __FUNCTION__);
+		return -ENOMEM;
+	}
+	memset(ccatdev, 0, sizeof(*ccatdev));
+	ccatdev->pdev = pdev;
+	pci_set_drvdata(pdev, ccatdev);
+
+	status = pci_enable_device_mem(pdev);
+	if (status) {
+		pr_info("enable %s failed: %d\n", pdev->dev.kobj.name, status);
+		return status;
+	}
+
+	status = pci_read_config_byte(pdev, PCI_REVISION_ID, &revision);
+	if (status) {
+		pr_warn("read CCAT pci revision failed with %d\n", status);
+		return status;
+	}
+
+	/* FIXME upgrade to a newer kernel to get support of dma_set_mask_and_coherent()
+	 * (!dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(64))) {
+	 */
+	if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {
+		pr_debug("64 bit DMA supported, pci rev: %u\n", revision);
+		/*} else if (!dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32))) { */
+	} else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
+		pr_debug("32 bit DMA supported, pci rev: %u\n", revision);
+	} else {
+		pr_warn("No suitable DMA available, pci rev: %u\n", revision);
+	}
+
+	if (ccat_bar_init(&ccatdev->bar[0], 0, pdev)) {
+		pr_warn("initialization of bar0 failed.\n");
+		return -EIO;
+	}
+
+	if (ccat_bar_init(&ccatdev->bar[2], 2, pdev)) {
+		pr_warn("initialization of bar2 failed.\n");
+		return -EIO;
+	}
+
+	pci_set_master(pdev);
+	if (ccat_functions_init(ccatdev)) {
+		pr_warn("some functions couldn't be initialized\n");
+	}
+	return 0;
+}
+
+static void ccat_remove(struct pci_dev *pdev)
+{
+	struct ccat_device *ccatdev = pci_get_drvdata(pdev);
+	if (ccatdev) {
+		ccat_functions_remove(ccatdev);
+		ccat_bar_free(&ccatdev->bar[2]);
+		ccat_bar_free(&ccatdev->bar[0]);
+		pci_disable_device(pdev);
+		pci_set_drvdata(pdev, NULL);
+		kfree(ccatdev);
+	}
+	pr_debug("%s() done.\n", __FUNCTION__);
+}
+
+#define PCI_DEVICE_ID_BECKHOFF_CCAT 0x5000
+#define PCI_VENDOR_ID_BECKHOFF 0x15EC
+
+static const struct pci_device_id pci_ids[] = {
+	{PCI_DEVICE(PCI_VENDOR_ID_BECKHOFF, PCI_DEVICE_ID_BECKHOFF_CCAT)},
+	{0,},
+};
+
+MODULE_DEVICE_TABLE(pci, pci_ids);
+
+static struct pci_driver pci_driver = {
+	.name = DRV_NAME,
+	.id_table = pci_ids,
+	.probe = ccat_probe,
+	.remove = ccat_remove,
+};
+
+static void ccat_exit_module(void)
+{
+	pci_unregister_driver(&pci_driver);
+}
+
+static int ccat_init_module(void)
+{
+	BUILD_BUG_ON(offsetof(struct ccat_eth_frame, data) !=
+		     CCAT_DMA_FRAME_HEADER_LENGTH);
+	pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION);
+	return pci_register_driver(&pci_driver);
+}
+
+module_exit(ccat_exit_module);
+module_init(ccat_init_module);