patch-2.4.25 linux-2.4.25/arch/ppc64/kernel/vio.c

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diff -urN linux-2.4.24/arch/ppc64/kernel/vio.c linux-2.4.25/arch/ppc64/kernel/vio.c
@@ -0,0 +1,503 @@
+/*
+ * IBM PowerPC Virtual I/O Infrastructure Support.
+ *
+ * Dave Engebretsen engebret@us.ibm.com
+ *    Copyright (c) 2003 Dave Engebretsen
+ *
+ *      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/pci.h>
+#include <linux/version.h>
+#include <linux/module.h>
+#include <asm/rtas.h>
+#include <asm/pci_dma.h>
+#include <asm/dma.h>
+#include <asm/ppcdebug.h>
+#include <asm/vio.h>
+#include <asm/hvcall.h>
+
+extern struct TceTable *build_tce_table(struct TceTable *tbl);
+
+extern dma_addr_t get_tces(struct TceTable *, unsigned order,
+			   void *page, unsigned numPages, int direction);
+extern void tce_free(struct TceTable *tbl, dma_addr_t dma_addr,
+		     unsigned order, unsigned num_pages);
+
+
+static struct vio_bus vio_bus;
+static LIST_HEAD(registered_vio_drivers);
+int vio_num_address_cells;
+EXPORT_SYMBOL(vio_num_address_cells);
+
+/**
+ * vio_register_driver: - Register a new vio driver
+ * @drv:	The vio_driver structure to be registered.
+ *
+ * Adds the driver structure to the list of registered drivers
+ * Returns the number of vio devices which were claimed by the driver
+ * during registration.  The driver remains registered even if the
+ * return value is zero.
+ */
+int vio_register_driver(struct vio_driver *drv)
+{
+	int count = 0;
+	struct vio_dev *dev;
+	const struct vio_device_id* id;
+	/*
+	 * Walk the vio_bus, find devices for this driver, and
+	 * call back into the driver probe interface.
+	 */
+
+	list_for_each_entry(dev, &vio_bus.devices, devices_list) {
+		id = vio_match_device(drv->id_table, dev);
+		if(drv && id) {
+			if (0 == drv->probe(dev, id)) {
+				dev->driver = drv;
+				count++;
+			}
+		}
+	}
+
+	list_add_tail(&drv->node, &registered_vio_drivers);
+
+	return count;
+}
+EXPORT_SYMBOL(vio_register_driver);
+
+/**
+ * vio_unregister_driver - Remove registration of vio driver.
+ * @driver:	The vio_driver struct to be removed form registration
+ *
+ * Searches for devices that are assigned to the driver and calls
+ * driver->remove() for each one.  Removes the driver from the list
+ * of registered drivers.  Returns the number of devices that were
+ * assigned to that driver.
+ */
+int vio_unregister_driver(struct vio_driver *driver)
+{
+	struct vio_dev *dev;
+	int devices_found = 0;
+
+	list_for_each_entry(dev, &vio_bus.devices, devices_list) {
+		if (dev->driver == driver) {
+			driver->remove(dev);
+			dev->driver = NULL;
+			devices_found++;
+		}
+	}
+
+	list_del(&driver->node);
+
+	return devices_found;
+}
+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.
+ */
+const struct vio_device_id *
+vio_match_device(const struct vio_device_id *ids, const struct vio_dev *dev)
+{
+	while (ids->type) {
+		if ((strncmp(dev->archdata->type, ids->type, strlen(ids->type)) == 0) &&
+			device_is_compatible((struct device_node*)dev->archdata, ids->compat))
+			return ids;
+		ids++;
+	}
+	return NULL;
+}
+
+/**
+ * vio_bus_init: - Initialize the virtual IO bus
+ */
+int __init
+vio_bus_init(void)
+{
+	struct device_node *node_vroot, *node_vdev;
+
+	printk("vio_bus_init: start\n");
+
+	INIT_LIST_HEAD(&vio_bus.devices);
+
+	/*
+	 * Create device node entries for each virtual device
+	 * identified in the device tree.
+	 * Functionally takes the place of pci_scan_bus
+	 */
+	node_vroot = find_devices("vdevice");
+	if (!node_vroot) {
+		printk(KERN_WARNING "vio_bus_init: no /vdevice node\n");
+		return 0;
+	}
+
+	vio_num_address_cells = prom_n_addr_cells(node_vroot->child);
+
+	for (node_vdev = node_vroot->child;
+			node_vdev != NULL;
+			node_vdev = node_vdev->sibling) {
+		printk(KERN_INFO "vio_bus_init: processing %p\n", node_vdev);
+
+		vio_register_device(node_vdev);
+	}
+
+	printk(KERN_INFO "vio_bus_init: done\n");
+
+	return 0;
+}
+
+__initcall(vio_bus_init);
+
+
+/**
+ * vio_register_device: - Register a new vio device.
+ * @archdata:	The OF node for this device.
+ *
+ * Creates and initializes a vio_dev structure from the data in
+ * node_vdev (archdata) 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(struct device_node *node_vdev)
+{
+	struct vio_dev *dev;
+	unsigned int *unit_address;
+	unsigned int *irq_p;
+
+	/* guarantee all vio_devs have 'device_type' field*/
+	if ((NULL == node_vdev->type)) {
+		printk(KERN_WARNING "vio_register_device: node %s missing 'device_type' "
+			, node_vdev->name?node_vdev->name:"UNKNOWN");
+		return NULL;
+	}
+
+	unit_address = (unsigned int *)get_property(node_vdev, "reg", NULL);
+	if(!unit_address) {
+		printk(KERN_WARNING "Can't find %s reg property\n", node_vdev->name?node_vdev->name:"UNKNOWN_DEVICE");
+		return NULL;
+	}
+
+	/* allocate a vio_dev for this node */
+	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+	memset(dev, 0, sizeof(*dev));
+
+	dev->archdata = (void*)node_vdev; /* to become of_get_node(node_vdev); */
+	dev->bus = &vio_bus;
+	dev->unit_address = *unit_address;
+	dev->tce_table = vio_build_tce_table(dev);
+
+	irq_p = (unsigned int *) get_property(node_vdev, "interrupts", 0);
+	if(irq_p) {
+		dev->irq = irq_offset_up(*irq_p);
+	} else {
+		dev->irq = (unsigned int) -1;
+	}
+
+	list_add_tail(&dev->devices_list, &vio_bus.devices);
+
+	return dev;
+}
+
+/**
+ * vio_find_driver: - Find driver for vio_dev.
+ * @dev:	Device to search for a driver.
+ *
+ * Walks the registered_vio_drivers list calling vio_match_device()
+ * for every driver in the list. If there is a match, calls the
+ * driver's probe().
+ * Returns a pointer to the matched driver or NULL if driver is not
+ * found.
+*/
+struct vio_driver * vio_find_driver(struct vio_dev* dev)
+{
+	struct vio_driver *driver;
+	list_for_each_entry(driver, &registered_vio_drivers, node) {
+		if(driver && vio_match_device(driver->id_table, dev)) {
+			if (0 < driver->probe(dev, NULL)) {
+				dev->driver = driver;
+				return driver;
+			}
+		}
+	}
+
+	return NULL;
+}
+
+/**
+ * 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((struct device_node *)vdev->archdata, (char*)which, length);
+}
+EXPORT_SYMBOL(vio_get_attribute);
+
+/**
+ * vio_build_tce_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.
+*/
+struct TceTable * vio_build_tce_table(struct vio_dev *dev)
+{
+	unsigned int *dma_window;
+	struct TceTable *newTceTable;
+	unsigned long offset;
+	unsigned long size;
+	int dma_window_property_size;
+
+	dma_window = (unsigned int *) get_property((struct device_node *)dev->archdata, "ibm,my-dma-window", &dma_window_property_size);
+	if(!dma_window) {
+		return NULL;
+	}
+
+	newTceTable = (struct TceTable *) kmalloc(sizeof(struct TceTable), GFP_KERNEL);
+
+	/* RPA docs say that #address-cells is always 1 for virtual
+		devices, but some older boxes' OF returns 2.  This should
+		be removed by GA, unless there is legacy OFs that still
+		have 2 for #address-cells */
+	size = ((dma_window[1+vio_num_address_cells]
+		>> PAGE_SHIFT) << 3) >> PAGE_SHIFT;
+
+	/* This is just an ugly kludge. Remove as soon as the OF for all
+	machines actually follow the spec and encodes the offset field
+	as phys-encode (that is, #address-cells wide)*/
+	if (dma_window_property_size == 12) {
+		size = ((dma_window[1] >> PAGE_SHIFT) << 3) >> PAGE_SHIFT;
+	} else if (dma_window_property_size == 20) {
+		size = ((dma_window[4] >> PAGE_SHIFT) << 3) >> PAGE_SHIFT;
+	} else {
+		printk(KERN_WARNING "vio_build_tce_table: Invalid size of ibm,my-dma-window=%i, using 0x80 for size\n", dma_window_property_size);
+		size = 0x80;
+	}
+
+	/*  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 units of pages of tce table */
+	newTceTable->size = size;
+	/* offset for VIO should always be 0 */
+	newTceTable->startOffset = offset;
+	newTceTable->busNumber   = 0;
+	newTceTable->index       = (unsigned long)dma_window[0];
+	newTceTable->tceType     = TCE_VB;
+
+	return build_tce_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);
+
+dma_addr_t vio_map_single(struct vio_dev *dev, void *vaddr,
+			  size_t size, int direction )
+{
+	struct TceTable * tbl;
+	dma_addr_t dma_handle = NO_TCE;
+	unsigned long uaddr;
+	unsigned order, nPages;
+
+	if(direction == PCI_DMA_NONE) BUG();
+
+	uaddr = (unsigned long)vaddr;
+	nPages = PAGE_ALIGN( uaddr + size ) - ( uaddr & PAGE_MASK );
+	order = get_order( nPages & PAGE_MASK );
+	nPages >>= PAGE_SHIFT;
+
+	/* Client asked for way to much space.  This is checked later anyway */
+	/* It is easier to debug here for the drivers than in the tce tables.*/
+	if(order >= NUM_TCE_LEVELS) {
+		printk("VIO_DMA: vio_map_single size to large: 0x%lx \n",size);
+		return NO_TCE;
+	}
+
+	tbl = dev->tce_table;
+
+	if(tbl) {
+		dma_handle = get_tces(tbl, order, vaddr, nPages, direction);
+		dma_handle |= (uaddr & ~PAGE_MASK);
+	}
+
+	return dma_handle;
+}
+EXPORT_SYMBOL(vio_map_single);
+
+void vio_unmap_single(struct vio_dev *dev, dma_addr_t dma_handle,
+		      size_t size, int direction)
+{
+	struct TceTable * tbl;
+	unsigned order, nPages;
+
+	if (direction == PCI_DMA_NONE) BUG();
+
+	nPages = PAGE_ALIGN( dma_handle + size ) - ( dma_handle & PAGE_MASK );
+	order = get_order( nPages & PAGE_MASK );
+	nPages >>= PAGE_SHIFT;
+
+	/* Client asked for way to much space.  This is checked later anyway */
+	/* It is easier to debug here for the drivers than in the tce tables.*/
+	if(order >= NUM_TCE_LEVELS) {
+		printk("VIO_DMA: vio_unmap_single 0x%lx size to large: 0x%lx \n",(unsigned long)dma_handle,(unsigned long)size);
+		return;
+	}
+
+	tbl = dev->tce_table;
+	if(tbl) tce_free(tbl, dma_handle, order, nPages);
+}
+EXPORT_SYMBOL(vio_unmap_single);
+
+int vio_map_sg(struct vio_dev *vdev, struct scatterlist *sglist, int nelems,
+	       int direction)
+{
+	int i;
+
+	for (i = 0; i < nelems; i++) {
+
+		/* 2.4 scsi scatterlists use address field.
+		   Not sure about other subsystems. */
+		void *vaddr;
+		if (sglist->address)
+			vaddr = sglist->address;
+		else
+			vaddr = page_address(sglist->page) + sglist->offset;
+
+		sglist->dma_address = vio_map_single(vdev, vaddr,
+						     sglist->length,
+						     direction);
+		sglist->dma_length = sglist->length;
+		sglist++;
+	}
+
+	return nelems;
+}
+EXPORT_SYMBOL(vio_map_sg);
+
+void vio_unmap_sg(struct vio_dev *vdev, struct scatterlist *sglist, int nelems,
+		  int direction)
+{
+	while (nelems--) {
+		vio_unmap_single(vdev, sglist->dma_address,
+				 sglist->dma_length, direction);
+		sglist++;
+	}
+}
+
+void *vio_alloc_consistent(struct vio_dev *dev, size_t size,
+			   dma_addr_t *dma_handle)
+{
+	struct TceTable * tbl;
+	void *ret = NULL;
+	unsigned order, nPages;
+	dma_addr_t tce;
+
+	size = PAGE_ALIGN(size);
+	order = get_order(size);
+	nPages = 1 << order;
+
+	/* Client asked for way to much space.  This is checked later anyway */
+	/* It is easier to debug here for the drivers than in the tce tables.*/
+	if(order >= NUM_TCE_LEVELS) {
+		printk("VIO_DMA: vio_alloc_consistent size to large: 0x%lx \n",size);
+		return (void *)NO_TCE;
+	}
+
+	tbl = dev->tce_table;
+
+	if ( tbl ) {
+		/* Alloc enough pages (and possibly more) */
+		ret = (void *)__get_free_pages( GFP_ATOMIC, order );
+		if ( ret ) {
+			/* Page allocation succeeded */
+			memset(ret, 0, nPages << PAGE_SHIFT);
+			/* Set up tces to cover the allocated range */
+			tce = get_tces( tbl, order, ret, nPages, PCI_DMA_BIDIRECTIONAL );
+			if ( tce == NO_TCE ) {
+				PPCDBG(PPCDBG_TCE, "vio_alloc_consistent: get_tces failed\n" );
+				free_pages( (unsigned long)ret, order );
+				ret = NULL;
+			}
+			else
+				{
+					*dma_handle = tce;
+				}
+		}
+		else PPCDBG(PPCDBG_TCE, "vio_alloc_consistent: __get_free_pages failed for order = %d\n", order);
+	}
+	else PPCDBG(PPCDBG_TCE, "vio_alloc_consistent: get_tce_table failed for 0x%016lx\n", dev);
+
+	PPCDBG(PPCDBG_TCE, "\tvio_alloc_consistent: dma_handle = 0x%16.16lx\n", *dma_handle);
+	PPCDBG(PPCDBG_TCE, "\tvio_alloc_consistent: return     = 0x%16.16lx\n", ret);
+	return ret;
+}
+EXPORT_SYMBOL(vio_alloc_consistent);
+
+void vio_free_consistent(struct vio_dev *dev, size_t size,
+			 void *vaddr, dma_addr_t dma_handle)
+{
+	struct TceTable * tbl;
+	unsigned order, nPages;
+
+	PPCDBG(PPCDBG_TCE, "vio_free_consistent:\n");
+	PPCDBG(PPCDBG_TCE, "\tdev = 0x%16.16lx, size = 0x%16.16lx, dma_handle = 0x%16.16lx, vaddr = 0x%16.16lx\n", dev, size, dma_handle, vaddr);
+
+	size = PAGE_ALIGN(size);
+	order = get_order(size);
+	nPages = 1 << order;
+
+	/* Client asked for way to much space.  This is checked later anyway */
+	/* It is easier to debug here for the drivers than in the tce tables.*/
+	if(order >= NUM_TCE_LEVELS) {
+		printk("PCI_DMA: pci_free_consistent size to large: 0x%lx \n",size);
+		return;
+	}
+
+	tbl = dev->tce_table;
+
+	if ( tbl ) {
+		tce_free(tbl, dma_handle, order, nPages);
+		free_pages( (unsigned long)vaddr, order );
+	}
+}
+EXPORT_SYMBOL(vio_free_consistent);
+
+EXPORT_SYMBOL(plpar_hcall_norets);
+EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
+
+
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