// SPDX-License-Identifier: GPL-2.0-only
/*
 *  PS3 system bus driver.
 *
 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
 *  Copyright 2006 Sony Corp.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/dma-map-ops.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! */
static struct {
        struct mutex mutex;
        int sb_11; /* usb 0 */
        int sb_12; /* usb 0 */
        int gpu;
} 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_warn("%s:%d: lv1_open_device dev=%u.%u(%s) failed: %s\n",
                        __func__, __LINE__, dev->match_id, dev->match_sub_id,
                        dev_name(&dev->core), 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_warn("%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,
        const struct device_driver *_drv)
{
        int result;
        const 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 void ps3_system_bus_remove(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, "%s:%d\n", __func__, __LINE__);

        drv = ps3_system_bus_dev_to_system_bus_drv(dev);
        BUG_ON(!drv);

        if (drv->remove)
                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));
}

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(const 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);

        return sysfs_emit(buf, "ps3:%d:%d\n", dev->match_id,
                          dev->match_sub_id);
}
static DEVICE_ATTR_RO(modalias);

static struct attribute *ps3_system_bus_dev_attrs[] = {
        &dev_attr_modalias.attr,
        NULL,
};
ATTRIBUTE_GROUPS(ps3_system_bus_dev);

static const 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_groups = ps3_system_bus_dev_groups,
};

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,
                                 unsigned long 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, unsigned long 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
 * is physical address to that hat 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_phys(struct device *_dev, phys_addr_t phys,
        size_t size, enum dma_data_direction direction, unsigned long attrs)
{
        struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
        int result;
        dma_addr_t bus_addr;
        void *ptr = phys_to_virt(phys);

        if (unlikely(attrs & DMA_ATTR_MMIO))
                return DMA_MAPPING_ERROR;

        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_phys(struct device *_dev, phys_addr_t phys,
                                    size_t size,
                                    enum dma_data_direction direction,
                                    unsigned long 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 = phys_to_virt(phys);

        if (unlikely(attrs & DMA_ATTR_MMIO))
                return DMA_MAPPING_ERROR;

        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 happened */
                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_phys(struct device *_dev, dma_addr_t dma_addr,
        size_t size, enum dma_data_direction direction, unsigned long 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, unsigned long 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,
                           unsigned long attrs)
{
        BUG();
        return -EINVAL;
}

static void ps3_sb_unmap_sg(struct device *_dev, struct scatterlist *sg,
        int nents, enum dma_data_direction direction, unsigned long 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,
                            unsigned long attrs)
{
        BUG();
}

static int ps3_dma_supported(struct device *_dev, u64 mask)
{
        return mask >= DMA_BIT_MASK(32);
}

static const 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,
        .map_phys = ps3_sb_map_phys,
        .unmap_phys = ps3_unmap_phys,
        .mmap = dma_common_mmap,
        .get_sgtable = dma_common_get_sgtable,
        .alloc_pages_op = dma_common_alloc_pages,
        .free_pages = dma_common_free_pages,
};

static const 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,
        .map_phys = ps3_ioc0_map_phys,
        .unmap_phys = ps3_unmap_phys,
        .mmap = dma_common_mmap,
        .get_sgtable = dma_common_get_sgtable,
        .alloc_pages_op = dma_common_alloc_pages,
        .free_pages = dma_common_free_pages,
};

/**
 * 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.dma_ops = &ps3_ioc0_dma_ops;
                dev_set_name(&dev->core, "ioc0_%02x", ++dev_ioc0_count);
                break;
        case PS3_DEVICE_TYPE_SB:
                dev->core.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);