1 files changed, 640 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/vio.c b/arch/ppc64/kernel/vio.c
new file mode 100644
index 00000000000..cdd830cb276
--- /dev/null
+++ b/arch/ppc64/kernel/vio.c
@@ -0,0 +1,640 @@
+/*
+ * IBM PowerPC Virtual I/O Infrastructure Support.
+ *
+ *    Copyright (c) 2003 IBM Corp.
+ *     Dave Engebretsen engebret@us.ibm.com
+ *     Santiago Leon santil@us.ibm.com
+ *     Hollis Blanchard <hollisb@us.ibm.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.
+ */
+
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/kobject.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <asm/rtas.h>
+#include <asm/iommu.h>
+#include <asm/dma.h>
+#include <asm/ppcdebug.h>
+#include <asm/vio.h>
+#include <asm/hvcall.h>
+#include <asm/iSeries/vio.h>
+#include <asm/iSeries/HvTypes.h>
+#include <asm/iSeries/HvCallXm.h>
+#include <asm/iSeries/HvLpConfig.h>
+
+#define DBGENTER() pr_debug("%s entered\n", __FUNCTION__)
+
+extern struct subsystem devices_subsys; /* needed for vio_find_name() */
+
+static const struct vio_device_id *vio_match_device(
+		const struct vio_device_id *, const struct vio_dev *);
+
+#ifdef CONFIG_PPC_PSERIES
+static struct iommu_table *vio_build_iommu_table(struct vio_dev *);
+static int vio_num_address_cells;
+#endif
+static struct vio_dev *vio_bus_device; /* fake "parent" device */
+
+#ifdef CONFIG_PPC_ISERIES
+static struct vio_dev *__init vio_register_device_iseries(char *type,
+		uint32_t unit_num);
+
+static struct iommu_table veth_iommu_table;
+static struct iommu_table vio_iommu_table;
+
+static struct vio_dev _vio_dev  = {
+	.iommu_table = &vio_iommu_table,
+	.dev.bus = &vio_bus_type
+};
+struct device *iSeries_vio_dev = &_vio_dev.dev;
+EXPORT_SYMBOL(iSeries_vio_dev);
+
+#define device_is_compatible(a, b)	1
+
+#endif
+
+/* convert from struct device to struct vio_dev and pass to driver.
+ * dev->driver has already been set by generic code because vio_bus_match
+ * succeeded. */
+static int vio_bus_probe(struct device *dev)
+{
+	struct vio_dev *viodev = to_vio_dev(dev);
+	struct vio_driver *viodrv = to_vio_driver(dev->driver);
+	const struct vio_device_id *id;
+	int error = -ENODEV;
+
+	DBGENTER();
+
+	if (!viodrv->probe)
+		return error;
+
+	id = vio_match_device(viodrv->id_table, viodev);
+	if (id) {
+		error = viodrv->probe(viodev, id);
+	}
+
+	return error;
+}
+
+/* convert from struct device to struct vio_dev and pass to driver. */
+static int vio_bus_remove(struct device *dev)
+{
+	struct vio_dev *viodev = to_vio_dev(dev);
+	struct vio_driver *viodrv = to_vio_driver(dev->driver);
+
+	DBGENTER();
+
+	if (viodrv->remove) {
+		return viodrv->remove(viodev);
+	}
+
+	/* driver can't remove */
+	return 1;
+}
+
+/**
+ * vio_register_driver: - Register a new vio driver
+ * @drv:	The vio_driver structure to be registered.
+ */
+int vio_register_driver(struct vio_driver *viodrv)
+{
+	printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
+		viodrv->name);
+
+	/* fill in 'struct driver' fields */
+	viodrv->driver.name = viodrv->name;
+	viodrv->driver.bus = &vio_bus_type;
+	viodrv->driver.probe = vio_bus_probe;
+	viodrv->driver.remove = vio_bus_remove;
+
+	return driver_register(&viodrv->driver);
+}
+EXPORT_SYMBOL(vio_register_driver);
+
+/**
+ * vio_unregister_driver - Remove registration of vio driver.
+ * @driver:	The vio_driver struct to be removed form registration
+ */
+void vio_unregister_driver(struct vio_driver *viodrv)
+{
+	driver_unregister(&viodrv->driver);
+}
+EXPORT_SYMBOL(vio_unregister_driver);
+
+/**
+ * vio_match_device: - Tell if a VIO device has a matching VIO device id structure.
+ * @ids: 	array of VIO device id structures to search in
+ * @dev: 	the VIO device structure to match against
+ *
+ * Used by a driver to check whether a VIO device present in the
+ * system is in its list of supported devices. Returns the matching
+ * vio_device_id structure or NULL if there is no match.
+ */
+static const struct vio_device_id * vio_match_device(const struct vio_device_id *ids,
+	const struct vio_dev *dev)
+{
+	DBGENTER();
+
+	while (ids->type) {
+		if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
+			device_is_compatible(dev->dev.platform_data, ids->compat))
+			return ids;
+		ids++;
+	}
+	return NULL;
+}
+
+#ifdef CONFIG_PPC_ISERIES
+void __init iommu_vio_init(void)
+{
+	struct iommu_table *t;
+	struct iommu_table_cb cb;
+	unsigned long cbp;
+	unsigned long itc_entries;
+
+	cb.itc_busno = 255;    /* Bus 255 is the virtual bus */
+	cb.itc_virtbus = 0xff; /* Ask for virtual bus */
+
+	cbp = virt_to_abs(&cb);
+	HvCallXm_getTceTableParms(cbp);
+
+	itc_entries = cb.itc_size * PAGE_SIZE / sizeof(union tce_entry);
+	veth_iommu_table.it_size        = itc_entries / 2;
+	veth_iommu_table.it_busno       = cb.itc_busno;
+	veth_iommu_table.it_offset      = cb.itc_offset;
+	veth_iommu_table.it_index       = cb.itc_index;
+	veth_iommu_table.it_type        = TCE_VB;
+	veth_iommu_table.it_blocksize	= 1;
+
+	t = iommu_init_table(&veth_iommu_table);
+
+	if (!t)
+		printk("Virtual Bus VETH TCE table failed.\n");
+
+	vio_iommu_table.it_size         = itc_entries - veth_iommu_table.it_size;
+	vio_iommu_table.it_busno        = cb.itc_busno;
+	vio_iommu_table.it_offset       = cb.itc_offset +
+					  veth_iommu_table.it_size;
+	vio_iommu_table.it_index        = cb.itc_index;
+	vio_iommu_table.it_type         = TCE_VB;
+	vio_iommu_table.it_blocksize	= 1;
+
+	t = iommu_init_table(&vio_iommu_table);
+
+	if (!t)
+		printk("Virtual Bus VIO TCE table failed.\n");
+}
+#endif
+
+#ifdef CONFIG_PPC_PSERIES
+static void probe_bus_pseries(void)
+{
+	struct device_node *node_vroot, *of_node;
+
+	node_vroot = find_devices("vdevice");
+	if ((node_vroot == NULL) || (node_vroot->child == NULL))
+		/* this machine doesn't do virtual IO, and that's ok */
+		return;
+
+	vio_num_address_cells = prom_n_addr_cells(node_vroot->child);
+
+	/*
+	 * Create struct vio_devices for each virtual device in the device tree.
+	 * Drivers will associate with them later.
+	 */
+	for (of_node = node_vroot->child; of_node != NULL;
+			of_node = of_node->sibling) {
+		printk(KERN_DEBUG "%s: processing %p\n", __FUNCTION__, of_node);
+		vio_register_device_node(of_node);
+	}
+}
+#endif
+
+#ifdef CONFIG_PPC_ISERIES
+static void probe_bus_iseries(void)
+{
+	HvLpIndexMap vlan_map = HvLpConfig_getVirtualLanIndexMap();
+	struct vio_dev *viodev;
+	int i;
+
+	/* there is only one of each of these */
+	vio_register_device_iseries("viocons", 0);
+	vio_register_device_iseries("vscsi", 0);
+
+	vlan_map = HvLpConfig_getVirtualLanIndexMap();
+	for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
+		if ((vlan_map & (0x8000 >> i)) == 0)
+			continue;
+		viodev = vio_register_device_iseries("vlan", i);
+		/* veth is special and has it own iommu_table */
+		viodev->iommu_table = &veth_iommu_table;
+	}
+	for (i = 0; i < HVMAXARCHITECTEDVIRTUALDISKS; i++)
+		vio_register_device_iseries("viodasd", i);
+	for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++)
+		vio_register_device_iseries("viocd", i);
+	for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++)
+		vio_register_device_iseries("viotape", i);
+}
+#endif
+
+/**
+ * vio_bus_init: - Initialize the virtual IO bus
+ */
+static int __init vio_bus_init(void)
+{
+	int err;
+
+	err = bus_register(&vio_bus_type);
+	if (err) {
+		printk(KERN_ERR "failed to register VIO bus\n");
+		return err;
+	}
+
+	/* the fake parent of all vio devices, just to give us a nice directory */
+	vio_bus_device = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
+	if (!vio_bus_device) {
+		return 1;
+	}
+	memset(vio_bus_device, 0, sizeof(struct vio_dev));
+	strcpy(vio_bus_device->dev.bus_id, "vio");
+
+	err = device_register(&vio_bus_device->dev);
+	if (err) {
+		printk(KERN_WARNING "%s: device_register returned %i\n", __FUNCTION__,
+			err);
+		kfree(vio_bus_device);
+		return err;
+	}
+
+#ifdef CONFIG_PPC_PSERIES
+	probe_bus_pseries();
+#endif
+#ifdef CONFIG_PPC_ISERIES
+	probe_bus_iseries();
+#endif
+
+	return 0;
+}
+
+__initcall(vio_bus_init);
+
+/* vio_dev refcount hit 0 */
+static void __devinit vio_dev_release(struct device *dev)
+{
+	DBGENTER();
+
+#ifdef CONFIG_PPC_PSERIES
+	/* XXX free TCE table */
+	of_node_put(dev->platform_data);
+#endif
+	kfree(to_vio_dev(dev));
+}
+
+#ifdef CONFIG_PPC_PSERIES
+static ssize_t viodev_show_devspec(struct device *dev, char *buf)
+{
+	struct device_node *of_node = dev->platform_data;
+
+	return sprintf(buf, "%s\n", of_node->full_name);
+}
+DEVICE_ATTR(devspec, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_devspec, NULL);
+#endif
+
+static ssize_t viodev_show_name(struct device *dev, char *buf)
+{
+	return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
+}
+DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL);
+
+static struct vio_dev * __devinit vio_register_device_common(
+		struct vio_dev *viodev, char *name, char *type,
+		uint32_t unit_address, struct iommu_table *iommu_table)
+{
+	DBGENTER();
+
+	viodev->name = name;
+	viodev->type = type;
+	viodev->unit_address = unit_address;
+	viodev->iommu_table = iommu_table;
+	/* init generic 'struct device' fields: */
+	viodev->dev.parent = &vio_bus_device->dev;
+	viodev->dev.bus = &vio_bus_type;
+	viodev->dev.release = vio_dev_release;
+
+	/* register with generic device framework */
+	if (device_register(&viodev->dev)) {
+		printk(KERN_ERR "%s: failed to register device %s\n",
+				__FUNCTION__, viodev->dev.bus_id);
+		return NULL;
+	}
+	device_create_file(&viodev->dev, &dev_attr_name);
+
+	return viodev;
+}
+
+#ifdef CONFIG_PPC_PSERIES
+/**
+ * vio_register_device_node: - Register a new vio device.
+ * @of_node:	The OF node for this device.
+ *
+ * Creates and initializes a vio_dev structure from the data in
+ * of_node (dev.platform_data) and adds it to the list of virtual devices.
+ * Returns a pointer to the created vio_dev or NULL if node has
+ * NULL device_type or compatible fields.
+ */
+struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
+{
+	struct vio_dev *viodev;
+	unsigned int *unit_address;
+	unsigned int *irq_p;
+
+	DBGENTER();
+
+	/* we need the 'device_type' property, in order to match with drivers */
+	if ((NULL == of_node->type)) {
+		printk(KERN_WARNING
+			"%s: node %s missing 'device_type'\n", __FUNCTION__,
+			of_node->name ? of_node->name : "<unknown>");
+		return NULL;
+	}
+
+	unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
+	if (!unit_address) {
+		printk(KERN_WARNING "%s: node %s missing 'reg'\n", __FUNCTION__,
+			of_node->name ? of_node->name : "<unknown>");
+		return NULL;
+	}
+
+	/* allocate a vio_dev for this node */
+	viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
+	if (!viodev) {
+		return NULL;
+	}
+	memset(viodev, 0, sizeof(struct vio_dev));
+
+	viodev->dev.platform_data = of_node_get(of_node);
+
+	viodev->irq = NO_IRQ;
+	irq_p = (unsigned int *)get_property(of_node, "interrupts", NULL);
+	if (irq_p) {
+		int virq = virt_irq_create_mapping(*irq_p);
+		if (virq == NO_IRQ) {
+			printk(KERN_ERR "Unable to allocate interrupt "
+			       "number for %s\n", of_node->full_name);
+		} else
+			viodev->irq = irq_offset_up(virq);
+	}
+
+	snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
+
+	/* register with generic device framework */
+	if (vio_register_device_common(viodev, of_node->name, of_node->type,
+				*unit_address, vio_build_iommu_table(viodev))
+			== NULL) {
+		/* XXX free TCE table */
+		kfree(viodev);
+		return NULL;
+	}
+	device_create_file(&viodev->dev, &dev_attr_devspec);
+
+	return viodev;
+}
+EXPORT_SYMBOL(vio_register_device_node);
+#endif
+
+#ifdef CONFIG_PPC_ISERIES
+/**
+ * vio_register_device: - Register a new vio device.
+ * @voidev:	The device to register.
+ */
+static struct vio_dev *__init vio_register_device_iseries(char *type,
+		uint32_t unit_num)
+{
+	struct vio_dev *viodev;
+
+	DBGENTER();
+
+	/* allocate a vio_dev for this node */
+	viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
+	if (!viodev)
+		return NULL;
+	memset(viodev, 0, sizeof(struct vio_dev));
+
+	snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%s%d", type, unit_num);
+
+	return vio_register_device_common(viodev, viodev->dev.bus_id, type,
+			unit_num, &vio_iommu_table);
+}
+#endif
+
+void __devinit vio_unregister_device(struct vio_dev *viodev)
+{
+	DBGENTER();
+#ifdef CONFIG_PPC_PSERIES
+	device_remove_file(&viodev->dev, &dev_attr_devspec);
+#endif
+	device_remove_file(&viodev->dev, &dev_attr_name);
+	device_unregister(&viodev->dev);
+}
+EXPORT_SYMBOL(vio_unregister_device);
+
+#ifdef CONFIG_PPC_PSERIES
+/**
+ * vio_get_attribute: - get attribute for virtual device
+ * @vdev:	The vio device to get property.
+ * @which:	The property/attribute to be extracted.
+ * @length:	Pointer to length of returned data size (unused if NULL).
+ *
+ * Calls prom.c's get_property() to return the value of the
+ * attribute specified by the preprocessor constant @which
+*/
+const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length)
+{
+	return get_property(vdev->dev.platform_data, (char*)which, length);
+}
+EXPORT_SYMBOL(vio_get_attribute);
+
+/* vio_find_name() - internal because only vio.c knows how we formatted the
+ * kobject name
+ * XXX once vio_bus_type.devices is actually used as a kset in
+ * drivers/base/bus.c, this function should be removed in favor of
+ * "device_find(kobj_name, &vio_bus_type)"
+ */
+static struct vio_dev *vio_find_name(const char *kobj_name)
+{
+	struct kobject *found;
+
+	found = kset_find_obj(&devices_subsys.kset, kobj_name);
+	if (!found)
+		return NULL;
+
+	return to_vio_dev(container_of(found, struct device, kobj));
+}
+
+/**
+ * vio_find_node - find an already-registered vio_dev
+ * @vnode: device_node of the virtual device we're looking for
+ */
+struct vio_dev *vio_find_node(struct device_node *vnode)
+{
+	uint32_t *unit_address;
+	char kobj_name[BUS_ID_SIZE];
+
+	/* construct the kobject name from the device node */
+	unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
+	if (!unit_address)
+		return NULL;
+	snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
+
+	return vio_find_name(kobj_name);
+}
+EXPORT_SYMBOL(vio_find_node);
+
+/**
+ * vio_build_iommu_table: - gets the dma information from OF and builds the TCE tree.
+ * @dev: the virtual device.
+ *
+ * Returns a pointer to the built tce tree, or NULL if it can't
+ * find property.
+*/
+static struct iommu_table * vio_build_iommu_table(struct vio_dev *dev)
+{
+	unsigned int *dma_window;
+	struct iommu_table *newTceTable;
+	unsigned long offset;
+	int dma_window_property_size;
+
+	dma_window = (unsigned int *) get_property(dev->dev.platform_data, "ibm,my-dma-window", &dma_window_property_size);
+	if(!dma_window) {
+		return NULL;
+	}
+
+	newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
+
+	/*  There should be some code to extract the phys-encoded offset
+		using prom_n_addr_cells(). However, according to a comment
+		on earlier versions, it's always zero, so we don't bother */
+	offset = dma_window[1] >>  PAGE_SHIFT;
+
+	/* TCE table size - measured in tce entries */
+	newTceTable->it_size		= dma_window[4] >> PAGE_SHIFT;
+	/* offset for VIO should always be 0 */
+	newTceTable->it_offset		= offset;
+	newTceTable->it_busno		= 0;
+	newTceTable->it_index		= (unsigned long)dma_window[0];
+	newTceTable->it_type		= TCE_VB;
+
+	return iommu_init_table(newTceTable);
+}
+
+int vio_enable_interrupts(struct vio_dev *dev)
+{
+	int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
+	if (rc != H_Success) {
+		printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
+	}
+	return rc;
+}
+EXPORT_SYMBOL(vio_enable_interrupts);
+
+int vio_disable_interrupts(struct vio_dev *dev)
+{
+	int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
+	if (rc != H_Success) {
+		printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
+	}
+	return rc;
+}
+EXPORT_SYMBOL(vio_disable_interrupts);
+#endif
+
+static dma_addr_t vio_map_single(struct device *dev, void *vaddr,
+			  size_t size, enum dma_data_direction direction)
+{
+	return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size,
+			direction);
+}
+
+static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle,
+		      size_t size, enum dma_data_direction direction)
+{
+	iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size,
+			direction);
+}
+
+static int vio_map_sg(struct device *dev, struct scatterlist *sglist,
+		int nelems, enum dma_data_direction direction)
+{
+	return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist,
+			nelems, direction);
+}
+
+static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist,
+		int nelems, enum dma_data_direction direction)
+{
+	iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction);
+}
+
+static void *vio_alloc_coherent(struct device *dev, size_t size,
+			   dma_addr_t *dma_handle, unsigned int __nocast flag)
+{
+	return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size,
+			dma_handle, flag);
+}
+
+static void vio_free_coherent(struct device *dev, size_t size,
+			 void *vaddr, dma_addr_t dma_handle)
+{
+	iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr,
+			dma_handle);
+}
+
+static int vio_dma_supported(struct device *dev, u64 mask)
+{
+	return 1;
+}
+
+struct dma_mapping_ops vio_dma_ops = {
+	.alloc_coherent = vio_alloc_coherent,
+	.free_coherent = vio_free_coherent,
+	.map_single = vio_map_single,
+	.unmap_single = vio_unmap_single,
+	.map_sg = vio_map_sg,
+	.unmap_sg = vio_unmap_sg,
+	.dma_supported = vio_dma_supported,
+};
+
+static int vio_bus_match(struct device *dev, struct device_driver *drv)
+{
+	const struct vio_dev *vio_dev = to_vio_dev(dev);
+	struct vio_driver *vio_drv = to_vio_driver(drv);
+	const struct vio_device_id *ids = vio_drv->id_table;
+	const struct vio_device_id *found_id;
+
+	DBGENTER();
+
+	if (!ids)
+		return 0;
+
+	found_id = vio_match_device(ids, vio_dev);
+	if (found_id)
+		return 1;
+
+	return 0;
+}
+
+struct bus_type vio_bus_type = {
+	.name = "vio",
+	.match = vio_bus_match,
+};
+
+EXPORT_SYMBOL(vio_bus_type);