diff options
Diffstat (limited to 'drivers/dma/ioat.c')
| -rw-r--r-- | drivers/dma/ioat.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/dma/ioat.c b/drivers/dma/ioat.c new file mode 100644 index 00000000000..f7276bf2fe7 --- /dev/null +++ b/drivers/dma/ioat.c @@ -0,0 +1,211 @@ +/* + * Intel I/OAT DMA Linux driver + * Copyright(c) 2007 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * 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 St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + */ + +/* + * This driver supports an Intel I/OAT DMA engine, which does asynchronous + * copy operations. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/dca.h> +#include "ioatdma.h" +#include "ioatdma_registers.h" +#include "ioatdma_hw.h" + +MODULE_VERSION("1.24"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Intel Corporation"); + +static struct pci_device_id ioat_pci_tbl[] = { + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) }, + { PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) }, + { 0, } +}; + +struct ioat_device { + struct pci_dev *pdev; + void __iomem *iobase; + struct ioatdma_device *dma; + struct dca_provider *dca; +}; + +static int __devinit ioat_probe(struct pci_dev *pdev, + const struct pci_device_id *id); +#ifdef IOAT_DMA_REMOVE +static void __devexit ioat_remove(struct pci_dev *pdev); +#endif + +static int ioat_dca_enabled = 1; +module_param(ioat_dca_enabled, int, 0644); +MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)"); + +static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase) +{ + struct ioat_device *device = pci_get_drvdata(pdev); + u8 version; + int err = 0; + + version = readb(iobase + IOAT_VER_OFFSET); + switch (version) { + case IOAT_VER_1_2: + device->dma = ioat_dma_probe(pdev, iobase); + if (ioat_dca_enabled) + device->dca = ioat_dca_init(pdev, iobase); + break; + default: + err = -ENODEV; + break; + } + return err; +} + +static void ioat_shutdown_functionality(struct pci_dev *pdev) +{ + struct ioat_device *device = pci_get_drvdata(pdev); + + if (device->dma) { + ioat_dma_remove(device->dma); + device->dma = NULL; + } + + if (device->dca) { + unregister_dca_provider(device->dca); + free_dca_provider(device->dca); + device->dca = NULL; + } + +} + +static struct pci_driver ioat_pci_drv = { + .name = "ioatdma", + .id_table = ioat_pci_tbl, + .probe = ioat_probe, + .shutdown = ioat_shutdown_functionality, +#ifdef IOAT_DMA_REMOVE + .remove = __devexit_p(ioat_remove), +#endif +}; + +static int __devinit ioat_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + void __iomem *iobase; + struct ioat_device *device; + unsigned long mmio_start, mmio_len; + int err; + + err = pci_enable_device(pdev); + if (err) + goto err_enable_device; + + err = pci_request_regions(pdev, ioat_pci_drv.name); + if (err) + goto err_request_regions; + + err = pci_set_dma_mask(pdev, DMA_64BIT_MASK); + if (err) + err = pci_set_dma_mask(pdev, DMA_32BIT_MASK); + if (err) + goto err_set_dma_mask; + + err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK); + if (err) + err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK); + if (err) + goto err_set_dma_mask; + + mmio_start = pci_resource_start(pdev, 0); + mmio_len = pci_resource_len(pdev, 0); + iobase = ioremap(mmio_start, mmio_len); + if (!iobase) { + err = -ENOMEM; + goto err_ioremap; + } + + device = kzalloc(sizeof(*device), GFP_KERNEL); + if (!device) { + err = -ENOMEM; + goto err_kzalloc; + } + device->pdev = pdev; + pci_set_drvdata(pdev, device); + device->iobase = iobase; + + pci_set_master(pdev); + + err = ioat_setup_functionality(pdev, iobase); + if (err) + goto err_version; + + return 0; + +err_version: + kfree(device); +err_kzalloc: + iounmap(iobase); +err_ioremap: +err_set_dma_mask: + pci_release_regions(pdev); + pci_disable_device(pdev); +err_request_regions: +err_enable_device: + return err; +} + +#ifdef IOAT_DMA_REMOVE +/* + * It is unsafe to remove this module: if removed while a requested + * dma is outstanding, esp. from tcp, it is possible to hang while + * waiting for something that will never finish, thus hanging at + * least one cpu. However, if you're feeling lucky and need to do + * some testing, this usually works just fine. + */ +static void __devexit ioat_remove(struct pci_dev *pdev) +{ + struct ioat_device *device = pci_get_drvdata(pdev); + + ioat_shutdown_functionality(pdev); + + kfree(device); + + iounmap(device->iobase); + pci_release_regions(pdev); + pci_disable_device(pdev); +} +#endif + +static int __init ioat_init_module(void) +{ + return pci_register_driver(&ioat_pci_drv); +} +module_init(ioat_init_module); + +static void __exit ioat_exit_module(void) +{ + pci_unregister_driver(&ioat_pci_drv); +} +module_exit(ioat_exit_module); |