- 根目录:
- arch
- powerpc
- platforms
- ps3
- system-bus.c
/*
* PS3 system bus driver.
*
* Copyright (C) 2006 Sony Computer Entertainment Inc.
* Copyright 2006 Sony Corp.
*
* 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; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <asm/udbg.h>
#include <asm/lv1call.h>
#include <asm/firmware.h>
#include <asm/cell-regs.h>
#include "platform.h"
static struct device ps3_system_bus = {
.init_name = "ps3_system",
};
/* FIXME: need device usage counters! */
struct {
struct mutex mutex;
int sb_11; /* usb 0 */
int sb_12; /* usb 0 */
int gpu;
} static usage_hack;
static int ps3_is_device(struct ps3_system_bus_device *dev, u64 bus_id,
u64 dev_id)
{
return dev->bus_id == bus_id && dev->dev_id == dev_id;
}
static int ps3_open_hv_device_sb(struct ps3_system_bus_device *dev)
{
int result;
BUG_ON(!dev->bus_id);
mutex_lock(&usage_hack.mutex);
if (ps3_is_device(dev, 1, 1)) {
usage_hack.sb_11++;
if (usage_hack.sb_11 > 1) {
result = 0;
goto done;
}
}
if (ps3_is_device(dev, 1, 2)) {
usage_hack.sb_12++;
if (usage_hack.sb_12 > 1) {
result = 0;
goto done;
}
}
result = lv1_open_device(dev->bus_id, dev->dev_id, 0);
if (result) {
pr_debug("%s:%d: lv1_open_device failed: %s\n", __func__,
__LINE__, ps3_result(result));
result = -EPERM;
}
done:
mutex_unlock(&usage_hack.mutex);
return result;
}
static int ps3_close_hv_device_sb(struct ps3_system_bus_device *dev)
{
int result;
BUG_ON(!dev->bus_id);
mutex_lock(&usage_hack.mutex);
if (ps3_is_device(dev, 1, 1)) {
usage_hack.sb_11--;
if (usage_hack.sb_11) {
result = 0;
goto done;
}
}
if (ps3_is_device(dev, 1, 2)) {
usage_hack.sb_12--;
if (usage_hack.sb_12) {
result = 0;
goto done;
}
}
result = lv1_close_device(dev->bus_id, dev->dev_id);
BUG_ON(result);
done:
mutex_unlock(&usage_hack.mutex);
return result;
}
static int ps3_open_hv_device_gpu(struct ps3_system_bus_device *dev)
{
int result;
mutex_lock(&usage_hack.mutex);
usage_hack.gpu++;
if (usage_hack.gpu > 1) {
result = 0;
goto done;
}
result = lv1_gpu_open(0);
if (result) {
pr_debug("%s:%d: lv1_gpu_open failed: %s\n", __func__,
__LINE__, ps3_result(result));
result = -EPERM;
}
done:
mutex_unlock(&usage_hack.mutex);
return result;
}
static int ps3_close_hv_device_gpu(struct ps3_system_bus_device *dev)
{
int result;
mutex_lock(&usage_hack.mutex);
usage_hack.gpu--;
if (usage_hack.gpu) {
result = 0;
goto done;
}
result = lv1_gpu_close();
BUG_ON(result);
done:
mutex_unlock(&usage_hack.mutex);
return result;
}
int ps3_open_hv_device(struct ps3_system_bus_device *dev)
{
BUG_ON(!dev);
pr_debug("%s:%d: match_id: %u\n", __func__, __LINE__, dev->match_id);
switch (dev->match_id) {
case PS3_MATCH_ID_EHCI:
case PS3_MATCH_ID_OHCI:
case PS3_MATCH_ID_GELIC:
case PS3_MATCH_ID_STOR_DISK:
case PS3_MATCH_ID_STOR_ROM:
case PS3_MATCH_ID_STOR_FLASH:
return ps3_open_hv_device_sb(dev);
case PS3_MATCH_ID_SOUND:
case PS3_MATCH_ID_GPU:
return ps3_open_hv_device_gpu(dev);
case PS3_MATCH_ID_AV_SETTINGS:
case PS3_MATCH_ID_SYSTEM_MANAGER:
pr_debug("%s:%d: unsupported match_id: %u\n", __func__,
__LINE__, dev->match_id);
pr_debug("%s:%d: bus_id: %llu\n", __func__, __LINE__,
dev->bus_id);
BUG();
return -EINVAL;
default:
break;
}
pr_debug("%s:%d: unknown match_id: %u\n", __func__, __LINE__,
dev->match_id);
BUG();
return -ENODEV;
}
EXPORT_SYMBOL_GPL(ps3_open_hv_device);
int ps3_close_hv_device(struct ps3_system_bus_device *dev)
{
BUG_ON(!dev);
pr_debug("%s:%d: match_id: %u\n", __func__, __LINE__, dev->match_id);
switch (dev->match_id) {
case PS3_MATCH_ID_EHCI:
case PS3_MATCH_ID_OHCI:
case PS3_MATCH_ID_GELIC:
case PS3_MATCH_ID_STOR_DISK:
case PS3_MATCH_ID_STOR_ROM:
case PS3_MATCH_ID_STOR_FLASH:
return ps3_close_hv_device_sb(dev);
case PS3_MATCH_ID_SOUND:
case PS3_MATCH_ID_GPU:
return ps3_close_hv_device_gpu(dev);
case PS3_MATCH_ID_AV_SETTINGS:
case PS3_MATCH_ID_SYSTEM_MANAGER:
pr_debug("%s:%d: unsupported match_id: %u\n", __func__,
__LINE__, dev->match_id);
pr_debug("%s:%d: bus_id: %llu\n", __func__, __LINE__,
dev->bus_id);
BUG();
return -EINVAL;
default:
break;
}
pr_debug("%s:%d: unknown match_id: %u\n", __func__, __LINE__,
dev->match_id);
BUG();
return -ENODEV;
}
EXPORT_SYMBOL_GPL(ps3_close_hv_device);
#define dump_mmio_region(_a) _dump_mmio_region(_a, __func__, __LINE__)
static void _dump_mmio_region(const struct ps3_mmio_region* r,
const char* func, int line)
{
pr_debug("%s:%d: dev %llu:%llu\n", func, line, r->dev->bus_id,
r->dev->dev_id);
pr_debug("%s:%d: bus_addr %lxh\n", func, line, r->bus_addr);
pr_debug("%s:%d: len %lxh\n", func, line, r->len);
pr_debug("%s:%d: lpar_addr %lxh\n", func, line, r->lpar_addr);
}
static int ps3_sb_mmio_region_create(struct ps3_mmio_region *r)
{
int result;
u64 lpar_addr;
result = lv1_map_device_mmio_region(r->dev->bus_id, r->dev->dev_id,
r->bus_addr, r->len, r->page_size, &lpar_addr);
r->lpar_addr = lpar_addr;
if (result) {
pr_debug("%s:%d: lv1_map_device_mmio_region failed: %s\n",
__func__, __LINE__, ps3_result(result));
r->lpar_addr = 0;
}
dump_mmio_region(r);
return result;
}
static int ps3_ioc0_mmio_region_create(struct ps3_mmio_region *r)
{
/* device specific; do nothing currently */
return 0;
}
int ps3_mmio_region_create(struct ps3_mmio_region *r)
{
return r->mmio_ops->create(r);
}
EXPORT_SYMBOL_GPL(ps3_mmio_region_create);
static int ps3_sb_free_mmio_region(struct ps3_mmio_region *r)
{
int result;
dump_mmio_region(r);
result = lv1_unmap_device_mmio_region(r->dev->bus_id, r->dev->dev_id,
r->lpar_addr);
if (result)
pr_debug("%s:%d: lv1_unmap_device_mmio_region failed: %s\n",
__func__, __LINE__, ps3_result(result));
r->lpar_addr = 0;
return result;
}
static int ps3_ioc0_free_mmio_region(struct ps3_mmio_region *r)
{
/* device specific; do nothing currently */
return 0;
}
int ps3_free_mmio_region(struct ps3_mmio_region *r)
{
return r->mmio_ops->free(r);
}
EXPORT_SYMBOL_GPL(ps3_free_mmio_region);
static const struct ps3_mmio_region_ops ps3_mmio_sb_region_ops = {
.create = ps3_sb_mmio_region_create,
.free = ps3_sb_free_mmio_region
};
static const struct ps3_mmio_region_ops ps3_mmio_ioc0_region_ops = {
.create = ps3_ioc0_mmio_region_create,
.free = ps3_ioc0_free_mmio_region
};
int ps3_mmio_region_init(struct ps3_system_bus_device *dev,
struct ps3_mmio_region *r, unsigned long bus_addr, unsigned long len,
enum ps3_mmio_page_size page_size)
{
r->dev = dev;
r->bus_addr = bus_addr;
r->len = len;
r->page_size = page_size;
switch (dev->dev_type) {
case PS3_DEVICE_TYPE_SB:
r->mmio_ops = &ps3_mmio_sb_region_ops;
break;
case PS3_DEVICE_TYPE_IOC0:
r->mmio_ops = &ps3_mmio_ioc0_region_ops;
break;
default:
BUG();
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(ps3_mmio_region_init);
static int ps3_system_bus_match(struct device *_dev,
struct device_driver *_drv)
{
int result;
struct ps3_system_bus_driver *drv = ps3_drv_to_system_bus_drv(_drv);
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
if (!dev->match_sub_id)
result = dev->match_id == drv->match_id;
else
result = dev->match_sub_id == drv->match_sub_id &&
dev->match_id == drv->match_id;
if (result)
pr_info("%s:%d: dev=%u.%u(%s), drv=%u.%u(%s): match\n",
__func__, __LINE__,
dev->match_id, dev->match_sub_id, dev_name(&dev->core),
drv->match_id, drv->match_sub_id, drv->core.name);
else
pr_debug("%s:%d: dev=%u.%u(%s), drv=%u.%u(%s): miss\n",
__func__, __LINE__,
dev->match_id, dev->match_sub_id, dev_name(&dev->core),
drv->match_id, drv->match_sub_id, drv->core.name);
return result;
}
static int ps3_system_bus_probe(struct device *_dev)
{
int result = 0;
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
struct ps3_system_bus_driver *drv;
BUG_ON(!dev);
dev_dbg(_dev, "%s:%d\n", __func__, __LINE__);
drv = ps3_system_bus_dev_to_system_bus_drv(dev);
BUG_ON(!drv);
if (drv->probe)
result = drv->probe(dev);
else
pr_debug("%s:%d: %s no probe method\n", __func__, __LINE__,
dev_name(&dev->core));
pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, dev_name(&dev->core));
return result;
}
static int ps3_system_bus_remove(struct device *_dev)
{
int result = 0;
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
struct ps3_system_bus_driver *drv;
BUG_ON(!dev);
dev_dbg(_dev, "%s:%d\n", __func__, __LINE__);
drv = ps3_system_bus_dev_to_system_bus_drv(dev);
BUG_ON(!drv);
if (drv->remove)
result = drv->remove(dev);
else
dev_dbg(&dev->core, "%s:%d %s: no remove method\n",
__func__, __LINE__, drv->core.name);
pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, dev_name(&dev->core));
return result;
}
static void ps3_system_bus_shutdown(struct device *_dev)
{
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
struct ps3_system_bus_driver *drv;
BUG_ON(!dev);
dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
dev->match_id);
if (!dev->core.driver) {
dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
__LINE__);
return;
}
drv = ps3_system_bus_dev_to_system_bus_drv(dev);
BUG_ON(!drv);
dev_dbg(&dev->core, "%s:%d: %s -> %s\n", __func__, __LINE__,
dev_name(&dev->core), drv->core.name);
if (drv->shutdown)
drv->shutdown(dev);
else if (drv->remove) {
dev_dbg(&dev->core, "%s:%d %s: no shutdown, calling remove\n",
__func__, __LINE__, drv->core.name);
drv->remove(dev);
} else {
dev_dbg(&dev->core, "%s:%d %s: no shutdown method\n",
__func__, __LINE__, drv->core.name);
BUG();
}
dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
}
static int ps3_system_bus_uevent(struct device *_dev, struct kobj_uevent_env *env)
{
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
if (add_uevent_var(env, "MODALIAS=ps3:%d:%d", dev->match_id,
dev->match_sub_id))
return -ENOMEM;
return 0;
}
static ssize_t modalias_show(struct device *_dev, struct device_attribute *a,
char *buf)
{
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
int len = snprintf(buf, PAGE_SIZE, "ps3:%d:%d\n", dev->match_id,
dev->match_sub_id);
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
}
static struct device_attribute ps3_system_bus_dev_attrs[] = {
__ATTR_RO(modalias),
__ATTR_NULL,
};
struct bus_type ps3_system_bus_type = {
.name = "ps3_system_bus",
.match = ps3_system_bus_match,
.uevent = ps3_system_bus_uevent,
.probe = ps3_system_bus_probe,
.remove = ps3_system_bus_remove,
.shutdown = ps3_system_bus_shutdown,
.dev_attrs = ps3_system_bus_dev_attrs,
};
static int __init ps3_system_bus_init(void)
{
int result;
if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
return -ENODEV;
pr_debug(" -> %s:%d\n", __func__, __LINE__);
mutex_init(&usage_hack.mutex);
result = device_register(&ps3_system_bus);
BUG_ON(result);
result = bus_register(&ps3_system_bus_type);
BUG_ON(result);
pr_debug(" <- %s:%d\n", __func__, __LINE__);
return result;
}
core_initcall(ps3_system_bus_init);
/* Allocates a contiguous real buffer and creates mappings over it.
* Returns the virtual address of the buffer and sets dma_handle
* to the dma address (mapping) of the first page.
*/
static void * ps3_alloc_coherent(struct device *_dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag,
struct dma_attrs *attrs)
{
int result;
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
unsigned long virt_addr;
flag &= ~(__GFP_DMA | __GFP_HIGHMEM);
flag |= __GFP_ZERO;
virt_addr = __get_free_pages(flag, get_order(size));
if (!virt_addr) {
pr_debug("%s:%d: get_free_pages failed\n", __func__, __LINE__);
goto clean_none;
}
result = ps3_dma_map(dev->d_region, virt_addr, size, dma_handle,
CBE_IOPTE_PP_W | CBE_IOPTE_PP_R |
CBE_IOPTE_SO_RW | CBE_IOPTE_M);
if (result) {
pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
__func__, __LINE__, result);
BUG_ON("check region type");
goto clean_alloc;
}
return (void*)virt_addr;
clean_alloc:
free_pages(virt_addr, get_order(size));
clean_none:
dma_handle = NULL;
return NULL;
}
static void ps3_free_coherent(struct device *_dev, size_t size, void *vaddr,
dma_addr_t dma_handle, struct dma_attrs *attrs)
{
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
ps3_dma_unmap(dev->d_region, dma_handle, size);
free_pages((unsigned long)vaddr, get_order(size));
}
/* Creates TCEs for a user provided buffer. The user buffer must be
* contiguous real kernel storage (not vmalloc). The address passed here
* comprises a page address and offset into that page. The dma_addr_t
* returned will point to the same byte within the page as was passed in.
*/
static dma_addr_t ps3_sb_map_page(struct device *_dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction direction,
struct dma_attrs *attrs)
{
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
int result;
dma_addr_t bus_addr;
void *ptr = page_address(page) + offset;
result = ps3_dma_map(dev->d_region, (unsigned long)ptr, size,
&bus_addr,
CBE_IOPTE_PP_R | CBE_IOPTE_PP_W |
CBE_IOPTE_SO_RW | CBE_IOPTE_M);
if (result) {
pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
__func__, __LINE__, result);
}
return bus_addr;
}
static dma_addr_t ps3_ioc0_map_page(struct device *_dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
int result;
dma_addr_t bus_addr;
u64 iopte_flag;
void *ptr = page_address(page) + offset;
iopte_flag = CBE_IOPTE_M;
switch (direction) {
case DMA_BIDIRECTIONAL:
iopte_flag |= CBE_IOPTE_PP_R | CBE_IOPTE_PP_W | CBE_IOPTE_SO_RW;
break;
case DMA_TO_DEVICE:
iopte_flag |= CBE_IOPTE_PP_R | CBE_IOPTE_SO_R;
break;
case DMA_FROM_DEVICE:
iopte_flag |= CBE_IOPTE_PP_W | CBE_IOPTE_SO_RW;
break;
default:
/* not happned */
BUG();
};
result = ps3_dma_map(dev->d_region, (unsigned long)ptr, size,
&bus_addr, iopte_flag);
if (result) {
pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
__func__, __LINE__, result);
}
return bus_addr;
}
static void ps3_unmap_page(struct device *_dev, dma_addr_t dma_addr,
size_t size, enum dma_data_direction direction, struct dma_attrs *attrs)
{
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
int result;
result = ps3_dma_unmap(dev->d_region, dma_addr, size);
if (result) {
pr_debug("%s:%d: ps3_dma_unmap failed (%d)\n",
__func__, __LINE__, result);
}
}
static int ps3_sb_map_sg(struct device *_dev, struct scatterlist *sgl,
int nents, enum dma_data_direction direction, struct dma_attrs *attrs)
{
#if defined(CONFIG_PS3_DYNAMIC_DMA)
BUG_ON("do");
return -EPERM;
#else
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
struct scatterlist *sg;
int i;
for_each_sg(sgl, sg, nents, i) {
int result = ps3_dma_map(dev->d_region, sg_phys(sg),
sg->length, &sg->dma_address, 0);
if (result) {
pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
__func__, __LINE__, result);
return -EINVAL;
}
sg->dma_length = sg->length;
}
return nents;
#endif
}
static int ps3_ioc0_map_sg(struct device *_dev, struct scatterlist *sg,
int nents,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
BUG();
return 0;
}
static void ps3_sb_unmap_sg(struct device *_dev, struct scatterlist *sg,
int nents, enum dma_data_direction direction, struct dma_attrs *attrs)
{
#if defined(CONFIG_PS3_DYNAMIC_DMA)
BUG_ON("do");
#endif
}
static void ps3_ioc0_unmap_sg(struct device *_dev, struct scatterlist *sg,
int nents, enum dma_data_direction direction,
struct dma_attrs *attrs)
{
BUG();
}
static int ps3_dma_supported(struct device *_dev, u64 mask)
{
return mask >= DMA_BIT_MASK(32);
}
static u64 ps3_dma_get_required_mask(struct device *_dev)
{
return DMA_BIT_MASK(32);
}
static struct dma_map_ops ps3_sb_dma_ops = {
.alloc = ps3_alloc_coherent,
.free = ps3_free_coherent,
.map_sg = ps3_sb_map_sg,
.unmap_sg = ps3_sb_unmap_sg,
.dma_supported = ps3_dma_supported,
.get_required_mask = ps3_dma_get_required_mask,
.map_page = ps3_sb_map_page,
.unmap_page = ps3_unmap_page,
};
static struct dma_map_ops ps3_ioc0_dma_ops = {
.alloc = ps3_alloc_coherent,
.free = ps3_free_coherent,
.map_sg = ps3_ioc0_map_sg,
.unmap_sg = ps3_ioc0_unmap_sg,
.dma_supported = ps3_dma_supported,
.get_required_mask = ps3_dma_get_required_mask,
.map_page = ps3_ioc0_map_page,
.unmap_page = ps3_unmap_page,
};
/**
* ps3_system_bus_release_device - remove a device from the system bus
*/
static void ps3_system_bus_release_device(struct device *_dev)
{
struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
kfree(dev);
}
/**
* ps3_system_bus_device_register - add a device to the system bus
*
* ps3_system_bus_device_register() expects the dev object to be allocated
* dynamically by the caller. The system bus takes ownership of the dev
* object and frees the object in ps3_system_bus_release_device().
*/
int ps3_system_bus_device_register(struct ps3_system_bus_device *dev)
{
int result;
static unsigned int dev_ioc0_count;
static unsigned int dev_sb_count;
static unsigned int dev_vuart_count;
static unsigned int dev_lpm_count;
if (!dev->core.parent)
dev->core.parent = &ps3_system_bus;
dev->core.bus = &ps3_system_bus_type;
dev->core.release = ps3_system_bus_release_device;
switch (dev->dev_type) {
case PS3_DEVICE_TYPE_IOC0:
dev->core.archdata.dma_ops = &ps3_ioc0_dma_ops;
dev_set_name(&dev->core, "ioc0_%02x", ++dev_ioc0_count);
break;
case PS3_DEVICE_TYPE_SB:
dev->core.archdata.dma_ops = &ps3_sb_dma_ops;
dev_set_name(&dev->core, "sb_%02x", ++dev_sb_count);
break;
case PS3_DEVICE_TYPE_VUART:
dev_set_name(&dev->core, "vuart_%02x", ++dev_vuart_count);
break;
case PS3_DEVICE_TYPE_LPM:
dev_set_name(&dev->core, "lpm_%02x", ++dev_lpm_count);
break;
default:
BUG();
};
dev->core.of_node = NULL;
set_dev_node(&dev->core, 0);
pr_debug("%s:%d add %s\n", __func__, __LINE__, dev_name(&dev->core));
result = device_register(&dev->core);
return result;
}
EXPORT_SYMBOL_GPL(ps3_system_bus_device_register);
int ps3_system_bus_driver_register(struct ps3_system_bus_driver *drv)
{
int result;
pr_debug(" -> %s:%d: %s\n", __func__, __LINE__, drv->core.name);
if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
return -ENODEV;
drv->core.bus = &ps3_system_bus_type;
result = driver_register(&drv->core);
pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, drv->core.name);
return result;
}
EXPORT_SYMBOL_GPL(ps3_system_bus_driver_register);
void ps3_system_bus_driver_unregister(struct ps3_system_bus_driver *drv)
{
pr_debug(" -> %s:%d: %s\n", __func__, __LINE__, drv->core.name);
driver_unregister(&drv->core);
pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, drv->core.name);
}
EXPORT_SYMBOL_GPL(ps3_system_bus_driver_unregister);