--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/devices/ccat/module.c Mon Nov 03 15:20:05 2014 +0100
@@ -0,0 +1,313 @@
+/**
+ 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 <linux/version.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", (u64) index);
+ return -EIO;
+ }
+
+ res = request_mem_region(bar->start, bar->len, KBUILD_MODNAME);
+ if (!res) {
+ pr_info("allocate mem_region failed.\n");
+ return -EIO;
+ }
+ pr_debug("bar%llu at [%lx,%lx] len=%lu res: %p.\n", (u64) 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", (u64) index);
+ release_mem_region(bar->start, bar->len);
+ return -EIO;
+ }
+ pr_debug("bar%llu I/O mem mapped to %p.\n", (u64) 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;
+ u64 addr;
+ u32 translateAddr;
+ u32 memTranslate;
+ u32 memSize;
+ u32 data = 0xffffffff;
+ u32 offset = (sizeof(u64) * 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", (u64) channel);
+ return -1;
+ }
+
+ if (request_dma(channel, KBUILD_MODNAME)) {
+ pr_info("request dma channel %llu failed\n", (u64) 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",
+ (u64) channel, dma->virt, (u64) (dma->phys), addr,
+ ioread32(ioaddr + offset + 4), ioread32(ioaddr + offset),
+ memTranslate, (u64) dma->size);
+ return 0;
+}
+
+/**
+ * Initialize all available CCAT functions.
+ *
+ * Return: count of failed functions
+ */
+static int ccat_functions_init(struct ccat_device *const ccatdev)
+{
+ static const size_t block_size = sizeof(struct ccat_info_block);
+ void __iomem *addr = ccatdev->bar[0].ioaddr; /** first block is the CCAT information block entry */
+ const u8 num_func = ioread8(addr + 4); /** number of CCAT function blocks is at offset 0x4 */
+ const void __iomem *end = addr + (block_size * num_func);
+ int status = 0; /** count init function failures */
+
+ while (addr < end) {
+ const u8 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 += block_size;
+ }
+ 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;
+ }
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0)
+ if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
+ pr_debug("64 bit DMA supported, pci rev: %u\n", revision);
+ } else if (!dma_set_mask_and_coherent(&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);
+ }
+#else
+ 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(&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);
+ }
+#endif
+
+ 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,},
+};
+
+#if 0 /* prevent auto-loading */
+MODULE_DEVICE_TABLE(pci, pci_ids);
+#endif
+
+static struct pci_driver pci_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = pci_ids,
+ .probe = ccat_probe,
+ .remove = ccat_remove,
+};
+
+static void __exit ccat_exit_module(void)
+{
+ pci_unregister_driver(&pci_driver);
+}
+
+static int __init ccat_init_module(void)
+{
+ 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);