vio.c

优龙2410linux2.6.8内核源代码

/*
 * IBM PowerPC Virtual I/O Infrastructure Support.
 *
 *    Copyright (c) 2003 IBM Corp.
 *     Dave Engebretsen [e-mail]
 *     Santiago Leon [e-mail]
 *     Hollis Blanchard <[e-mail]>
 *
 *      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;

	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);

	veth_iommu_table.it_size        = cb.itc_size / 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_entrysize	= sizeof(union tce_entry);
	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         = cb.itc_size - 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 * (PAGE_SIZE/sizeof(union tce_entry));
	vio_iommu_table.it_index        = cb.itc_index;
	vio_iommu_table.it_type         = TCE_VB;
	vio_iommu_table.it_entrysize	= sizeof(union tce_entry);
	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;

	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;