/*
 * Copyright 2012 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */
#define nv50_instmem(p) container_of((p), struct nv50_instmem, base)
#include "priv.h"

#include <core/memory.h>
#include <subdev/bar.h>
#include <subdev/fb.h>
#include <subdev/mmu.h>

struct nv50_instmem {
        struct nvkm_instmem base;
        unsigned long lock_flags;
        spinlock_t lock;
        u64 addr;
};

/******************************************************************************
 * instmem object implementation
 *****************************************************************************/
#define nv50_instobj(p) container_of((p), struct nv50_instobj, memory)

struct nv50_instobj {
        struct nvkm_memory memory;
        struct nv50_instmem *imem;
        struct nvkm_mem *mem;
        struct nvkm_vma bar;
        void *map;
};

static enum nvkm_memory_target
nv50_instobj_target(struct nvkm_memory *memory)
{
        return NVKM_MEM_TARGET_VRAM;
}

static u64
nv50_instobj_addr(struct nvkm_memory *memory)
{
        return nv50_instobj(memory)->mem->offset;
}

static u64
nv50_instobj_size(struct nvkm_memory *memory)
{
        return (u64)nv50_instobj(memory)->mem->size << NVKM_RAM_MM_SHIFT;
}

static void
nv50_instobj_boot(struct nvkm_memory *memory, struct nvkm_vm *vm)
{
        struct nv50_instobj *iobj = nv50_instobj(memory);
        struct nvkm_subdev *subdev = &iobj->imem->base.subdev;
        struct nvkm_device *device = subdev->device;
        u64 size = nvkm_memory_size(memory);
        void __iomem *map;
        int ret;

        iobj->map = ERR_PTR(-ENOMEM);

        ret = nvkm_vm_get(vm, size, 12, NV_MEM_ACCESS_RW, &iobj->bar);
        if (ret == 0) {
                map = ioremap(device->func->resource_addr(device, 3) +
                              (u32)iobj->bar.offset, size);
                if (map) {
                        nvkm_memory_map(memory, &iobj->bar, 0);
                        iobj->map = map;
                } else {
                        nvkm_warn(subdev, "PRAMIN ioremap failed\n");
                        nvkm_vm_put(&iobj->bar);
                }
        } else {
                nvkm_warn(subdev, "PRAMIN exhausted\n");
        }
}

static void
nv50_instobj_release(struct nvkm_memory *memory)
{
        struct nv50_instmem *imem = nv50_instobj(memory)->imem;
        spin_unlock_irqrestore(&imem->lock, imem->lock_flags);
}

static void __iomem *
nv50_instobj_acquire(struct nvkm_memory *memory)
{
        struct nv50_instobj *iobj = nv50_instobj(memory);
        struct nv50_instmem *imem = iobj->imem;
        struct nvkm_bar *bar = imem->base.subdev.device->bar;
        struct nvkm_vm *vm;
        unsigned long flags;

        if (!iobj->map && (vm = nvkm_bar_kmap(bar)))
                nvkm_memory_boot(memory, vm);
        if (!IS_ERR_OR_NULL(iobj->map))
                return iobj->map;

        spin_lock_irqsave(&imem->lock, flags);
        imem->lock_flags = flags;
        return NULL;
}

static u32
nv50_instobj_rd32(struct nvkm_memory *memory, u64 offset)
{
        struct nv50_instobj *iobj = nv50_instobj(memory);
        struct nv50_instmem *imem = iobj->imem;
        struct nvkm_device *device = imem->base.subdev.device;
        u64 base = (iobj->mem->offset + offset) & 0xffffff00000ULL;
        u64 addr = (iobj->mem->offset + offset) & 0x000000fffffULL;
        u32 data;

        if (unlikely(imem->addr != base)) {
                nvkm_wr32(device, 0x001700, base >> 16);
                imem->addr = base;
        }
        data = nvkm_rd32(device, 0x700000 + addr);
        return data;
}

static void
nv50_instobj_wr32(struct nvkm_memory *memory, u64 offset, u32 data)
{
        struct nv50_instobj *iobj = nv50_instobj(memory);
        struct nv50_instmem *imem = iobj->imem;
        struct nvkm_device *device = imem->base.subdev.device;
        u64 base = (iobj->mem->offset + offset) & 0xffffff00000ULL;
        u64 addr = (iobj->mem->offset + offset) & 0x000000fffffULL;

        if (unlikely(imem->addr != base)) {
                nvkm_wr32(device, 0x001700, base >> 16);
                imem->addr = base;
        }
        nvkm_wr32(device, 0x700000 + addr, data);
}

static void
nv50_instobj_map(struct nvkm_memory *memory, struct nvkm_vma *vma, u64 offset)
{
        struct nv50_instobj *iobj = nv50_instobj(memory);
        nvkm_vm_map_at(vma, offset, iobj->mem);
}

static void *
nv50_instobj_dtor(struct nvkm_memory *memory)
{
        struct nv50_instobj *iobj = nv50_instobj(memory);
        struct nvkm_ram *ram = iobj->imem->base.subdev.device->fb->ram;
        if (!IS_ERR_OR_NULL(iobj->map)) {
                nvkm_vm_put(&iobj->bar);
                iounmap(iobj->map);
        }
        ram->func->put(ram, &iobj->mem);
        return iobj;
}

static const struct nvkm_memory_func
nv50_instobj_func = {
        .dtor = nv50_instobj_dtor,
        .target = nv50_instobj_target,
        .size = nv50_instobj_size,
        .addr = nv50_instobj_addr,
        .boot = nv50_instobj_boot,
        .acquire = nv50_instobj_acquire,
        .release = nv50_instobj_release,
        .rd32 = nv50_instobj_rd32,
        .wr32 = nv50_instobj_wr32,
        .map = nv50_instobj_map,
};

static int
nv50_instobj_new(struct nvkm_instmem *base, u32 size, u32 align, bool zero,
                 struct nvkm_memory **pmemory)
{
        struct nv50_instmem *imem = nv50_instmem(base);
        struct nv50_instobj *iobj;
        struct nvkm_ram *ram = imem->base.subdev.device->fb->ram;
        int ret;

        if (!(iobj = kzalloc(sizeof(*iobj), GFP_KERNEL)))
                return -ENOMEM;
        *pmemory = &iobj->memory;

        nvkm_memory_ctor(&nv50_instobj_func, &iobj->memory);
        iobj->imem = imem;

        size  = max((size  + 4095) & ~4095, (u32)4096);
        align = max((align + 4095) & ~4095, (u32)4096);

        ret = ram->func->get(ram, size, align, 0, 0x800, &iobj->mem);
        if (ret)
                return ret;

        iobj->mem->page_shift = 12;
        return 0;
}

/******************************************************************************
 * instmem subdev implementation
 *****************************************************************************/

static void
nv50_instmem_fini(struct nvkm_instmem *base)
{
        nv50_instmem(base)->addr = ~0ULL;
}

static const struct nvkm_instmem_func
nv50_instmem = {
        .fini = nv50_instmem_fini,
        .memory_new = nv50_instobj_new,
        .persistent = false,
        .zero = false,
};

int
nv50_instmem_new(struct nvkm_device *device, int index,
                 struct nvkm_instmem **pimem)
{
        struct nv50_instmem *imem;

        if (!(imem = kzalloc(sizeof(*imem), GFP_KERNEL)))
                return -ENOMEM;
        nvkm_instmem_ctor(&nv50_instmem, device, index, &imem->base);
        spin_lock_init(&imem->lock);
        *pimem = &imem->base;
        return 0;
}