1 // SPDX-License-Identifier: GPL-2.0-or-later
10  * vp_legacy_probe: probe the legacy virtio pci device, note that the
11  * caller is required to enable PCI device before calling this function.
12  * @ldev: the legacy virtio-pci device
18 	struct pci_dev *pci_dev = ldev->pci_dev;  in vp_legacy_probe()
22 	if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)  in vp_legacy_probe()
23 		return -ENODEV;  in vp_legacy_probe()
25 	if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION)  in vp_legacy_probe()
26 		return -ENODEV;  in vp_legacy_probe()
28 	rc = dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(64));  in vp_legacy_probe()
30 		rc = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32));  in vp_legacy_probe()
33 		 * The virtio ring base address is expressed as a 32-bit PFN,  in vp_legacy_probe()
36 		dma_set_coherent_mask(&pci_dev->dev,  in vp_legacy_probe()
41 …dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA.  Trying to continue, but this migh…  in vp_legacy_probe()
43 	rc = pci_request_region(pci_dev, 0, "virtio-pci-legacy");  in vp_legacy_probe()
47 	ldev->ioaddr = pci_iomap(pci_dev, 0, 0);  in vp_legacy_probe()
48 	if (!ldev->ioaddr) {  in vp_legacy_probe()
49 		rc = -EIO;  in vp_legacy_probe()
53 	ldev->isr = ldev->ioaddr + VIRTIO_PCI_ISR;  in vp_legacy_probe()
55 	ldev->id.vendor = pci_dev->subsystem_vendor;  in vp_legacy_probe()
56 	ldev->id.device = pci_dev->subsystem_device;  in vp_legacy_probe()
66  * vp_legacy_probe: remove and cleanup the legacy virtio pci device
67  * @ldev: the legacy virtio-pci device
71 	struct pci_dev *pci_dev = ldev->pci_dev;  in vp_legacy_remove()
73 	pci_iounmap(pci_dev, ldev->ioaddr);  in vp_legacy_remove()
79  * vp_legacy_get_features - get features from device
80  * @ldev: the legacy virtio-pci device
82  * Returns the features read from the device
87 	return ioread32(ldev->ioaddr + VIRTIO_PCI_HOST_FEATURES);  in vp_legacy_get_features()
92  * vp_legacy_get_driver_features - get driver features from device
93  * @ldev: the legacy virtio-pci device
95  * Returns the driver features read from the device
99 	return ioread32(ldev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);  in vp_legacy_get_driver_features()
104  * vp_legacy_set_features - set features to device
105  * @ldev: the legacy virtio-pci device
106  * @features: the features set to device
111 	iowrite32(features, ldev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);  in vp_legacy_set_features()
116  * vp_legacy_get_status - get the device status
117  * @ldev: the legacy virtio-pci device
119  * Returns the status read from device
123 	return ioread8(ldev->ioaddr + VIRTIO_PCI_STATUS);  in vp_legacy_get_status()
128  * vp_legacy_set_status - set status to device
129  * @ldev: the legacy virtio-pci device
130  * @status: the status set to device
135 	iowrite8(status, ldev->ioaddr + VIRTIO_PCI_STATUS);  in vp_legacy_set_status()
140  * vp_legacy_queue_vector - set the MSIX vector for a specific virtqueue
141  * @ldev: the legacy virtio-pci device
145  * Returns the config vector read from the device
150 	iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL);  in vp_legacy_queue_vector()
151 	iowrite16(vector, ldev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);  in vp_legacy_queue_vector()
152 	/* Flush the write out to device */  in vp_legacy_queue_vector()
153 	return ioread16(ldev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);  in vp_legacy_queue_vector()
158  * vp_legacy_config_vector - set the vector for config interrupt
159  * @ldev: the legacy virtio-pci device
162  * Returns the config vector read from the device
168 	iowrite16(vector, ldev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);  in vp_legacy_config_vector()
170 	/* Will also flush the write out to device */  in vp_legacy_config_vector()
171 	return ioread16(ldev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);  in vp_legacy_config_vector()
176  * vp_legacy_set_queue_address - set the virtqueue address
177  * @ldev: the legacy virtio-pci device
184 	iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL);  in vp_legacy_set_queue_address()
185 	iowrite32(queue_pfn, ldev->ioaddr + VIRTIO_PCI_QUEUE_PFN);  in vp_legacy_set_queue_address()
190  * vp_legacy_get_queue_enable - enable a virtqueue
191  * @ldev: the legacy virtio-pci device
199 	iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL);  in vp_legacy_get_queue_enable()
200 	return ioread32(ldev->ioaddr + VIRTIO_PCI_QUEUE_PFN);  in vp_legacy_get_queue_enable()
205  * vp_legacy_get_queue_size - get size for a virtqueue
206  * @ldev: the legacy virtio-pci device
214 	iowrite16(index, ldev->ioaddr + VIRTIO_PCI_QUEUE_SEL);  in vp_legacy_get_queue_size()
215 	return ioread16(ldev->ioaddr + VIRTIO_PCI_QUEUE_NUM);  in vp_legacy_get_queue_size()
220 MODULE_DESCRIPTION("Legacy Virtio PCI Device");