mirror of
https://github.com/edk2-porting/linux-next.git
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e10fa77368
As an added bonus, since every vio_dev now has a device_node associated with it, hotplug now works. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/*
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* IBM PowerPC pSeries Virtual I/O Infrastructure Support.
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*
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* Copyright (c) 2003-2005 IBM Corp.
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* Dave Engebretsen engebret@us.ibm.com
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* Santiago Leon santil@us.ibm.com
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* Hollis Blanchard <hollisb@us.ibm.com>
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* Stephen Rothwell
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/kobject.h>
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#include <asm/iommu.h>
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#include <asm/dma.h>
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#include <asm/prom.h>
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#include <asm/vio.h>
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#include <asm/hvcall.h>
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#include <asm/tce.h>
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extern struct subsystem devices_subsys; /* needed for vio_find_name() */
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/**
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* vio_match_device_pseries: - Tell if a pSeries VIO device matches a
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* vio_device_id
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*/
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static int vio_match_device_pseries(const struct vio_device_id *id,
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const struct vio_dev *dev)
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{
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return (strncmp(dev->type, id->type, strlen(id->type)) == 0) &&
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device_is_compatible(dev->dev.platform_data, id->compat);
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}
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/**
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* vio_build_iommu_table: - gets the dma information from OF and
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* builds the TCE tree.
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* @dev: the virtual device.
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*
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* Returns a pointer to the built tce tree, or NULL if it can't
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* find property.
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*/
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static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
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{
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unsigned int *dma_window;
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struct iommu_table *newTceTable;
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unsigned long offset;
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int dma_window_property_size;
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dma_window = (unsigned int *) get_property(dev->dev.platform_data, "ibm,my-dma-window", &dma_window_property_size);
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if(!dma_window) {
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return NULL;
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}
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newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
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/* There should be some code to extract the phys-encoded offset
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using prom_n_addr_cells(). However, according to a comment
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on earlier versions, it's always zero, so we don't bother */
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offset = dma_window[1] >> PAGE_SHIFT;
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/* TCE table size - measured in tce entries */
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newTceTable->it_size = dma_window[4] >> PAGE_SHIFT;
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/* offset for VIO should always be 0 */
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newTceTable->it_offset = offset;
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newTceTable->it_busno = 0;
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newTceTable->it_index = (unsigned long)dma_window[0];
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newTceTable->it_type = TCE_VB;
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return iommu_init_table(newTceTable);
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}
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static struct vio_bus_ops vio_bus_ops_pseries = {
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.match = vio_match_device_pseries,
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.build_iommu_table = vio_build_iommu_table,
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};
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/**
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* vio_bus_init_pseries: - Initialize the pSeries virtual IO bus
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*/
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static int __init vio_bus_init_pseries(void)
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{
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return vio_bus_init(&vio_bus_ops_pseries);
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}
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__initcall(vio_bus_init_pseries);
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/* vio_find_name() - internal because only vio.c knows how we formatted the
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* kobject name
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* XXX once vio_bus_type.devices is actually used as a kset in
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* drivers/base/bus.c, this function should be removed in favor of
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* "device_find(kobj_name, &vio_bus_type)"
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*/
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static struct vio_dev *vio_find_name(const char *kobj_name)
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{
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struct kobject *found;
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found = kset_find_obj(&devices_subsys.kset, kobj_name);
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if (!found)
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return NULL;
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return to_vio_dev(container_of(found, struct device, kobj));
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}
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/**
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* vio_find_node - find an already-registered vio_dev
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* @vnode: device_node of the virtual device we're looking for
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*/
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struct vio_dev *vio_find_node(struct device_node *vnode)
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{
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uint32_t *unit_address;
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char kobj_name[BUS_ID_SIZE];
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/* construct the kobject name from the device node */
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unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
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if (!unit_address)
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return NULL;
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snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
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return vio_find_name(kobj_name);
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}
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EXPORT_SYMBOL(vio_find_node);
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int vio_enable_interrupts(struct vio_dev *dev)
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{
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int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
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if (rc != H_SUCCESS)
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printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
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return rc;
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}
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EXPORT_SYMBOL(vio_enable_interrupts);
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int vio_disable_interrupts(struct vio_dev *dev)
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{
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int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
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if (rc != H_SUCCESS)
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printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
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return rc;
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}
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EXPORT_SYMBOL(vio_disable_interrupts);
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