/*
 * Copyright 2013 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_ram(p) container_of((p), struct nv50_ram, base)
#include "ram.h"
#include "ramseq.h"
#include "nv50.h"

#include <core/option.h>
#include <subdev/bios.h>
#include <subdev/bios/perf.h>
#include <subdev/bios/pll.h>
#include <subdev/bios/rammap.h>
#include <subdev/bios/timing.h>
#include <subdev/clk/pll.h>
#include <subdev/gpio.h>

struct nv50_ramseq {
        struct hwsq base;
        struct hwsq_reg r_0x002504;
        struct hwsq_reg r_0x004008;
        struct hwsq_reg r_0x00400c;
        struct hwsq_reg r_0x00c040;
        struct hwsq_reg r_0x100200;
        struct hwsq_reg r_0x100210;
        struct hwsq_reg r_0x10021c;
        struct hwsq_reg r_0x1002d0;
        struct hwsq_reg r_0x1002d4;
        struct hwsq_reg r_0x1002dc;
        struct hwsq_reg r_0x10053c;
        struct hwsq_reg r_0x1005a0;
        struct hwsq_reg r_0x1005a4;
        struct hwsq_reg r_0x100710;
        struct hwsq_reg r_0x100714;
        struct hwsq_reg r_0x100718;
        struct hwsq_reg r_0x10071c;
        struct hwsq_reg r_0x100da0;
        struct hwsq_reg r_0x100e20;
        struct hwsq_reg r_0x100e24;
        struct hwsq_reg r_0x611200;
        struct hwsq_reg r_timing[9];
        struct hwsq_reg r_mr[4];
        struct hwsq_reg r_gpio[4];
};

struct nv50_ram {
        struct nvkm_ram base;
        struct nv50_ramseq hwsq;
};

#define T(t) cfg->timing_10_##t
static int
nv50_ram_timing_calc(struct nv50_ram *ram, u32 *timing)
{
        struct nvbios_ramcfg *cfg = &ram->base.target.bios;
        struct nvkm_subdev *subdev = &ram->base.fb->subdev;
        struct nvkm_device *device = subdev->device;
        u32 cur2, cur4, cur7, cur8;
        u8 unkt3b;

        cur2 = nvkm_rd32(device, 0x100228);
        cur4 = nvkm_rd32(device, 0x100230);
        cur7 = nvkm_rd32(device, 0x10023c);
        cur8 = nvkm_rd32(device, 0x100240);

        switch ((!T(CWL)) * ram->base.type) {
        case NVKM_RAM_TYPE_DDR2:
                T(CWL) = T(CL) - 1;
                break;
        case NVKM_RAM_TYPE_GDDR3:
                T(CWL) = ((cur2 & 0xff000000) >> 24) + 1;
                break;
        }

        /* XXX: N=1 is not proper statistics */
        if (device->chipset == 0xa0) {
                unkt3b = 0x19 + ram->base.next->bios.rammap_00_16_40;
                timing[6] = (0x2d + T(CL) - T(CWL) +
                                ram->base.next->bios.rammap_00_16_40) << 16 |
                            T(CWL) << 8 |
                            (0x2f + T(CL) - T(CWL));
        } else {
                unkt3b = 0x16;
                timing[6] = (0x2b + T(CL) - T(CWL)) << 16 |
                            max_t(s8, T(CWL) - 2, 1) << 8 |
                            (0x2e + T(CL) - T(CWL));
        }

        timing[0] = (T(RP) << 24 | T(RAS) << 16 | T(RFC) << 8 | T(RC));
        timing[1] = (T(WR) + 1 + T(CWL)) << 24 |
                    max_t(u8, T(18), 1) << 16 |
                    (T(WTR) + 1 + T(CWL)) << 8 |
                    (3 + T(CL) - T(CWL));
        timing[2] = (T(CWL) - 1) << 24 |
                    (T(RRD) << 16) |
                    (T(RCDWR) << 8) |
                    T(RCDRD);
        timing[3] = (unkt3b - 2 + T(CL)) << 24 |
                    unkt3b << 16 |
                    (T(CL) - 1) << 8 |
                    (T(CL) - 1);
        timing[4] = (cur4 & 0xffff0000) |
                    T(13) << 8 |
                    T(13);
        timing[5] = T(RFC) << 24 |
                    max_t(u8, T(RCDRD), T(RCDWR)) << 16 |
                    T(RP);
        /* Timing 6 is already done above */
        timing[7] = (cur7 & 0xff00ffff) | (T(CL) - 1) << 16;
        timing[8] = (cur8 & 0xffffff00);

        /* XXX: P.version == 1 only has DDR2 and GDDR3? */
        if (ram->base.type == NVKM_RAM_TYPE_DDR2) {
                timing[5] |= (T(CL) + 3) << 8;
                timing[8] |= (T(CL) - 4);
        } else
        if (ram->base.type == NVKM_RAM_TYPE_GDDR3) {
                timing[5] |= (T(CL) + 2) << 8;
                timing[8] |= (T(CL) - 2);
        }

        nvkm_debug(subdev, " 220: %08x %08x %08x %08x\n",
                   timing[0], timing[1], timing[2], timing[3]);
        nvkm_debug(subdev, " 230: %08x %08x %08x %08x\n",
                   timing[4], timing[5], timing[6], timing[7]);
        nvkm_debug(subdev, " 240: %08x\n", timing[8]);
        return 0;
}

static int
nv50_ram_timing_read(struct nv50_ram *ram, u32 *timing)
{
        unsigned int i;
        struct nvbios_ramcfg *cfg = &ram->base.target.bios;
        struct nvkm_subdev *subdev = &ram->base.fb->subdev;
        struct nvkm_device *device = subdev->device;

        for (i = 0; i <= 8; i++)
                timing[i] = nvkm_rd32(device, 0x100220 + (i * 4));

        /* Derive the bare minimum for the MR calculation to succeed */
        cfg->timing_ver = 0x10;
        T(CL) = (timing[3] & 0xff) + 1;

        switch (ram->base.type) {
        case NVKM_RAM_TYPE_DDR2:
                T(CWL) = T(CL) - 1;
                break;
        case NVKM_RAM_TYPE_GDDR3:
                T(CWL) = ((timing[2] & 0xff000000) >> 24) + 1;
                break;
        default:
                return -ENOSYS;
                break;
        }

        T(WR) = ((timing[1] >> 24) & 0xff) - 1 - T(CWL);

        return 0;
}
#undef T

static void
nvkm_sddr2_dll_reset(struct nv50_ramseq *hwsq)
{
        ram_mask(hwsq, mr[0], 0x100, 0x100);
        ram_mask(hwsq, mr[0], 0x100, 0x000);
        ram_nsec(hwsq, 24000);
}

static void
nv50_ram_gpio(struct nv50_ramseq *hwsq, u8 tag, u32 val)
{
        struct nvkm_gpio *gpio = hwsq->base.subdev->device->gpio;
        struct dcb_gpio_func func;
        u32 reg, sh, gpio_val;
        int ret;

        if (nvkm_gpio_get(gpio, 0, tag, DCB_GPIO_UNUSED) != val) {
                ret = nvkm_gpio_find(gpio, 0, tag, DCB_GPIO_UNUSED, &func);
                if (ret)
                        return;

                reg = func.line >> 3;
                sh = (func.line & 0x7) << 2;
                gpio_val = ram_rd32(hwsq, gpio[reg]);

                if (gpio_val & (8 << sh))
                        val = !val;
                if (!(func.log[1] & 1))
                        val = !val;

                ram_mask(hwsq, gpio[reg], (0x3 << sh), ((val | 0x2) << sh));
                ram_nsec(hwsq, 20000);
        }
}

static int
nv50_ram_calc(struct nvkm_ram *base, u32 freq)
{
        struct nv50_ram *ram = nv50_ram(base);
        struct nv50_ramseq *hwsq = &ram->hwsq;
        struct nvkm_subdev *subdev = &ram->base.fb->subdev;
        struct nvkm_bios *bios = subdev->device->bios;
        struct nvbios_perfE perfE;
        struct nvbios_pll mpll;
        struct nvkm_ram_data *next;
        u8  ver, hdr, cnt, len, strap, size;
        u32 data;
        u32 r100da0, r004008, unk710, unk714, unk718, unk71c;
        int N1, M1, N2, M2, P;
        int ret, i;
        u32 timing[9];

        next = &ram->base.target;
        next->freq = freq;
        ram->base.next = next;

        /* lookup closest matching performance table entry for frequency */
        i = 0;
        do {
                data = nvbios_perfEp(bios, i++, &ver, &hdr, &cnt,
                                     &size, &perfE);
                if (!data || (ver < 0x25 || ver >= 0x40) ||
                    (size < 2)) {
                        nvkm_error(subdev, "invalid/missing perftab entry\n");
                        return -EINVAL;
                }
        } while (perfE.memory < freq);

        nvbios_rammapEp_from_perf(bios, data, hdr, &next->bios);

        /* locate specific data set for the attached memory */
        strap = nvbios_ramcfg_index(subdev);
        if (strap >= cnt) {
                nvkm_error(subdev, "invalid ramcfg strap\n");
                return -EINVAL;
        }

        data = nvbios_rammapSp_from_perf(bios, data + hdr, size, strap,
                        &next->bios);
        if (!data) {
                nvkm_error(subdev, "invalid/missing rammap entry ");
                return -EINVAL;
        }

        /* lookup memory timings, if bios says they're present */
        if (next->bios.ramcfg_timing != 0xff) {
                data = nvbios_timingEp(bios, next->bios.ramcfg_timing,
                                        &ver, &hdr, &cnt, &len, &next->bios);
                if (!data || ver != 0x10 || hdr < 0x12) {
                        nvkm_error(subdev, "invalid/missing timing entry "
                                 "%02x %04x %02x %02x\n",
                                 strap, data, ver, hdr);
                        return -EINVAL;
                }
                nv50_ram_timing_calc(ram, timing);
        } else {
                nv50_ram_timing_read(ram, timing);
        }

        ret = ram_init(hwsq, subdev);
        if (ret)
                return ret;

        /* Determine ram-specific MR values */
        ram->base.mr[0] = ram_rd32(hwsq, mr[0]);
        ram->base.mr[1] = ram_rd32(hwsq, mr[1]);
        ram->base.mr[2] = ram_rd32(hwsq, mr[2]);

        switch (ram->base.type) {
        case NVKM_RAM_TYPE_GDDR3:
                ret = nvkm_gddr3_calc(&ram->base);
                break;
        default:
                ret = -ENOSYS;
                break;
        }

        if (ret) {
                nvkm_error(subdev, "Could not calculate MR\n");
                return ret;
        }

        if (subdev->device->chipset <= 0x96 && !next->bios.ramcfg_00_03_02)
                ram_mask(hwsq, 0x100710, 0x00000200, 0x00000000);

        /* Always disable this bit during reclock */
        ram_mask(hwsq, 0x100200, 0x00000800, 0x00000000);

        ram_wait_vblank(hwsq);
        ram_wr32(hwsq, 0x611200, 0x00003300);
        ram_wr32(hwsq, 0x002504, 0x00000001); /* block fifo */
        ram_nsec(hwsq, 8000);
        ram_setf(hwsq, 0x10, 0x00); /* disable fb */
        ram_wait(hwsq, 0x00, 0x01); /* wait for fb disabled */
        ram_nsec(hwsq, 2000);

        if (next->bios.timing_10_ODT)
                nv50_ram_gpio(hwsq, 0x2e, 1);

        ram_wr32(hwsq, 0x1002d4, 0x00000001); /* precharge */
        ram_wr32(hwsq, 0x1002d0, 0x00000001); /* refresh */
        ram_wr32(hwsq, 0x1002d0, 0x00000001); /* refresh */
        ram_wr32(hwsq, 0x100210, 0x00000000); /* disable auto-refresh */
        ram_wr32(hwsq, 0x1002dc, 0x00000001); /* enable self-refresh */

        ret = nvbios_pll_parse(bios, 0x004008, &mpll);
        mpll.vco2.max_freq = 0;
        if (ret >= 0) {
                ret = nv04_pll_calc(subdev, &mpll, freq,
                                    &N1, &M1, &N2, &M2, &P);
                if (ret <= 0)
                        ret = -EINVAL;
        }

        if (ret < 0)
                return ret;

        /* XXX: 750MHz seems rather arbitrary */
        if (freq <= 750000) {
                r100da0 = 0x00000010;
                r004008 = 0x90000000;
        } else {
                r100da0 = 0x00000000;
                r004008 = 0x80000000;
        }

        r004008 |= (mpll.bias_p << 19) | (P << 22) | (P << 16);

        ram_mask(hwsq, 0x00c040, 0xc000c000, 0x0000c000);
        /* XXX: Is rammap_00_16_40 the DLL bit we've seen in GT215? Why does
         * it have a different rammap bit from DLLoff? */
        ram_mask(hwsq, 0x004008, 0x00004200, 0x00000200 |
                        next->bios.rammap_00_16_40 << 14);
        ram_mask(hwsq, 0x00400c, 0x0000ffff, (N1 << 8) | M1);
        ram_mask(hwsq, 0x004008, 0x91ff0000, r004008);

        /* XXX: GDDR3 only? */
        if (subdev->device->chipset >= 0x92)
                ram_wr32(hwsq, 0x100da0, r100da0);

        nv50_ram_gpio(hwsq, 0x18, !next->bios.ramcfg_FBVDDQ);
        ram_nsec(hwsq, 64000); /*XXX*/
        ram_nsec(hwsq, 32000); /*XXX*/

        ram_mask(hwsq, 0x004008, 0x00002200, 0x00002000);

        ram_wr32(hwsq, 0x1002dc, 0x00000000); /* disable self-refresh */
        ram_wr32(hwsq, 0x1002d4, 0x00000001); /* disable self-refresh */
        ram_wr32(hwsq, 0x100210, 0x80000000); /* enable auto-refresh */

        ram_nsec(hwsq, 12000);

        switch (ram->base.type) {
        case NVKM_RAM_TYPE_DDR2:
                ram_nuke(hwsq, mr[0]); /* force update */
                ram_mask(hwsq, mr[0], 0x000, 0x000);
                break;
        case NVKM_RAM_TYPE_GDDR3:
                ram_nuke(hwsq, mr[1]); /* force update */
                ram_wr32(hwsq, mr[1], ram->base.mr[1]);
                ram_nuke(hwsq, mr[0]); /* force update */
                ram_wr32(hwsq, mr[0], ram->base.mr[0]);
                break;
        default:
                break;
        }

        ram_mask(hwsq, timing[3], 0xffffffff, timing[3]);
        ram_mask(hwsq, timing[1], 0xffffffff, timing[1]);
        ram_mask(hwsq, timing[6], 0xffffffff, timing[6]);
        ram_mask(hwsq, timing[7], 0xffffffff, timing[7]);
        ram_mask(hwsq, timing[8], 0xffffffff, timing[8]);
        ram_mask(hwsq, timing[0], 0xffffffff, timing[0]);
        ram_mask(hwsq, timing[2], 0xffffffff, timing[2]);
        ram_mask(hwsq, timing[4], 0xffffffff, timing[4]);
        ram_mask(hwsq, timing[5], 0xffffffff, timing[5]);

        if (!next->bios.ramcfg_00_03_02)
                ram_mask(hwsq, 0x10021c, 0x00010000, 0x00000000);
        ram_mask(hwsq, 0x100200, 0x00001000, !next->bios.ramcfg_00_04_02 << 12);

        /* XXX: A lot of this could be "chipset"/"ram type" specific stuff */
        unk710  = ram_rd32(hwsq, 0x100710) & ~0x00000100;
        unk714  = ram_rd32(hwsq, 0x100714) & ~0xf0000020;
        unk718  = ram_rd32(hwsq, 0x100718) & ~0x00000100;
        unk71c  = ram_rd32(hwsq, 0x10071c) & ~0x00000100;
        if (subdev->device->chipset <= 0x96) {
                unk710 &= ~0x0000006e;
                unk714 &= ~0x00000100;

                if (!next->bios.ramcfg_00_03_08)
                        unk710 |= 0x00000060;
                if (!next->bios.ramcfg_FBVDDQ)
                        unk714 |= 0x00000100;
                if ( next->bios.ramcfg_00_04_04)
                        unk710 |= 0x0000000e;
        } else {
                unk710 &= ~0x00000001;

                if (!next->bios.ramcfg_00_03_08)
                        unk710 |= 0x00000001;
        }

        if ( next->bios.ramcfg_00_03_01)
                unk71c |= 0x00000100;
        if ( next->bios.ramcfg_00_03_02)
                unk710 |= 0x00000100;
        if (!next->bios.ramcfg_00_03_08)
                unk714 |= 0x00000020;
        if ( next->bios.ramcfg_00_04_04)
                unk714 |= 0x70000000;
        if ( next->bios.ramcfg_00_04_20)
                unk718 |= 0x00000100;

        ram_mask(hwsq, 0x100714, 0xffffffff, unk714);
        ram_mask(hwsq, 0x10071c, 0xffffffff, unk71c);
        ram_mask(hwsq, 0x100718, 0xffffffff, unk718);
        ram_mask(hwsq, 0x100710, 0xffffffff, unk710);

        /* XXX: G94 does not even test these regs in trace. Harmless we do it,
         * but why is it omitted? */
        if (next->bios.rammap_00_16_20) {
                ram_wr32(hwsq, 0x1005a0, next->bios.ramcfg_00_07 << 16 |
                                         next->bios.ramcfg_00_06 << 8 |
                                         next->bios.ramcfg_00_05);
                ram_wr32(hwsq, 0x1005a4, next->bios.ramcfg_00_09 << 8 |
                                         next->bios.ramcfg_00_08);
                ram_mask(hwsq, 0x10053c, 0x00001000, 0x00000000);
        } else {
                ram_mask(hwsq, 0x10053c, 0x00001000, 0x00001000);
        }
        ram_mask(hwsq, mr[1], 0xffffffff, ram->base.mr[1]);

        if (!next->bios.timing_10_ODT)
                nv50_ram_gpio(hwsq, 0x2e, 0);

        /* Reset DLL */
        if (!next->bios.ramcfg_DLLoff)
                nvkm_sddr2_dll_reset(hwsq);

        ram_setf(hwsq, 0x10, 0x01); /* enable fb */
        ram_wait(hwsq, 0x00, 0x00); /* wait for fb enabled */
        ram_wr32(hwsq, 0x611200, 0x00003330);
        ram_wr32(hwsq, 0x002504, 0x00000000); /* un-block fifo */

        if (next->bios.rammap_00_17_02)
                ram_mask(hwsq, 0x100200, 0x00000800, 0x00000800);
        if (!next->bios.rammap_00_16_40)
                ram_mask(hwsq, 0x004008, 0x00004000, 0x00000000);
        if (next->bios.ramcfg_00_03_02)
                ram_mask(hwsq, 0x10021c, 0x00010000, 0x00010000);
        if (subdev->device->chipset <= 0x96 && next->bios.ramcfg_00_03_02)
                ram_mask(hwsq, 0x100710, 0x00000200, 0x00000200);

        return 0;
}

static int
nv50_ram_prog(struct nvkm_ram *base)
{
        struct nv50_ram *ram = nv50_ram(base);
        struct nvkm_device *device = ram->base.fb->subdev.device;
        ram_exec(&ram->hwsq, nvkm_boolopt(device->cfgopt, "NvMemExec", true));
        return 0;
}

static void
nv50_ram_tidy(struct nvkm_ram *base)
{
        struct nv50_ram *ram = nv50_ram(base);
        ram_exec(&ram->hwsq, false);
}

void
__nv50_ram_put(struct nvkm_ram *ram, struct nvkm_mem *mem)
{
        struct nvkm_mm_node *this;

        while (!list_empty(&mem->regions)) {
                this = list_first_entry(&mem->regions, typeof(*this), rl_entry);

                list_del(&this->rl_entry);
                nvkm_mm_free(&ram->vram, &this);
        }

        nvkm_mm_free(&ram->tags, &mem->tag);
}

void
nv50_ram_put(struct nvkm_ram *ram, struct nvkm_mem **pmem)
{
        struct nvkm_mem *mem = *pmem;

        *pmem = NULL;
        if (unlikely(mem == NULL))
                return;

        mutex_lock(&ram->fb->subdev.mutex);
        __nv50_ram_put(ram, mem);
        mutex_unlock(&ram->fb->subdev.mutex);

        kfree(mem);
}

int
nv50_ram_get(struct nvkm_ram *ram, u64 size, u32 align, u32 ncmin,
             u32 memtype, struct nvkm_mem **pmem)
{
        struct nvkm_mm *heap = &ram->vram;
        struct nvkm_mm *tags = &ram->tags;
        struct nvkm_mm_node *r;
        struct nvkm_mem *mem;
        int comp = (memtype & 0x300) >> 8;
        int type = (memtype & 0x07f);
        int back = (memtype & 0x800);
        int min, max, ret;

        max = (size >> NVKM_RAM_MM_SHIFT);
        min = ncmin ? (ncmin >> NVKM_RAM_MM_SHIFT) : max;
        align >>= NVKM_RAM_MM_SHIFT;

        mem = kzalloc(sizeof(*mem), GFP_KERNEL);
        if (!mem)
                return -ENOMEM;

        mutex_lock(&ram->fb->subdev.mutex);
        if (comp) {
                if (align == (1 << (16 - NVKM_RAM_MM_SHIFT))) {
                        int n = (max >> 4) * comp;

                        ret = nvkm_mm_head(tags, 0, 1, n, n, 1, &mem->tag);
                        if (ret)
                                mem->tag = NULL;
                }

                if (unlikely(!mem->tag))
                        comp = 0;
        }

        INIT_LIST_HEAD(&mem->regions);
        mem->memtype = (comp << 7) | type;
        mem->size = max;

        type = nv50_fb_memtype[type];
        do {
                if (back)
                        ret = nvkm_mm_tail(heap, 0, type, max, min, align, &r);
                else
                        ret = nvkm_mm_head(heap, 0, type, max, min, align, &r);
                if (ret) {
                        mutex_unlock(&ram->fb->subdev.mutex);
                        ram->func->put(ram, &mem);
                        return ret;
                }

                list_add_tail(&r->rl_entry, &mem->regions);
                max -= r->length;
        } while (max);
        mutex_unlock(&ram->fb->subdev.mutex);

        r = list_first_entry(&mem->regions, struct nvkm_mm_node, rl_entry);
        mem->offset = (u64)r->offset << NVKM_RAM_MM_SHIFT;
        *pmem = mem;
        return 0;
}

static const struct nvkm_ram_func
nv50_ram_func = {
        .get = nv50_ram_get,
        .put = nv50_ram_put,
        .calc = nv50_ram_calc,
        .prog = nv50_ram_prog,
        .tidy = nv50_ram_tidy,
};

static u32
nv50_fb_vram_rblock(struct nvkm_ram *ram)
{
        struct nvkm_subdev *subdev = &ram->fb->subdev;
        struct nvkm_device *device = subdev->device;
        int colbits, rowbitsa, rowbitsb, banks;
        u64 rowsize, predicted;
        u32 r0, r4, rt, rblock_size;

        r0 = nvkm_rd32(device, 0x100200);
        r4 = nvkm_rd32(device, 0x100204);
        rt = nvkm_rd32(device, 0x100250);
        nvkm_debug(subdev, "memcfg %08x %08x %08x %08x\n",
                   r0, r4, rt, nvkm_rd32(device, 0x001540));

        colbits  =  (r4 & 0x0000f000) >> 12;
        rowbitsa = ((r4 & 0x000f0000) >> 16) + 8;
        rowbitsb = ((r4 & 0x00f00000) >> 20) + 8;
        banks    = 1 << (((r4 & 0x03000000) >> 24) + 2);

        rowsize = ram->parts * banks * (1 << colbits) * 8;
        predicted = rowsize << rowbitsa;
        if (r0 & 0x00000004)
                predicted += rowsize << rowbitsb;

        if (predicted != ram->size) {
                nvkm_warn(subdev, "memory controller reports %d MiB VRAM\n",
                          (u32)(ram->size >> 20));
        }

        rblock_size = rowsize;
        if (rt & 1)
                rblock_size *= 3;

        nvkm_debug(subdev, "rblock %d bytes\n", rblock_size);
        return rblock_size;
}

int
nv50_ram_ctor(const struct nvkm_ram_func *func,
              struct nvkm_fb *fb, struct nvkm_ram *ram)
{
        struct nvkm_device *device = fb->subdev.device;
        struct nvkm_bios *bios = device->bios;
        const u32 rsvd_head = ( 256 * 1024); /* vga memory */
        const u32 rsvd_tail = (1024 * 1024); /* vbios etc */
        u64 size = nvkm_rd32(device, 0x10020c);
        u32 tags = nvkm_rd32(device, 0x100320);
        enum nvkm_ram_type type = NVKM_RAM_TYPE_UNKNOWN;
        int ret;

        switch (nvkm_rd32(device, 0x100714) & 0x00000007) {
        case 0: type = NVKM_RAM_TYPE_DDR1; break;
        case 1:
                if (nvkm_fb_bios_memtype(bios) == NVKM_RAM_TYPE_DDR3)
                        type = NVKM_RAM_TYPE_DDR3;
                else
                        type = NVKM_RAM_TYPE_DDR2;
                break;
        case 2: type = NVKM_RAM_TYPE_GDDR3; break;
        case 3: type = NVKM_RAM_TYPE_GDDR4; break;
        case 4: type = NVKM_RAM_TYPE_GDDR5; break;
        default:
                break;
        }

        size = (size & 0x000000ff) << 32 | (size & 0xffffff00);

        ret = nvkm_ram_ctor(func, fb, type, size, tags, ram);
        if (ret)
                return ret;

        ram->part_mask = (nvkm_rd32(device, 0x001540) & 0x00ff0000) >> 16;
        ram->parts = hweight8(ram->part_mask);
        ram->ranks = (nvkm_rd32(device, 0x100200) & 0x4) ? 2 : 1;
        nvkm_mm_fini(&ram->vram);

        return nvkm_mm_init(&ram->vram, rsvd_head >> NVKM_RAM_MM_SHIFT,
                            (size - rsvd_head - rsvd_tail) >> NVKM_RAM_MM_SHIFT,
                            nv50_fb_vram_rblock(ram) >> NVKM_RAM_MM_SHIFT);
}

int
nv50_ram_new(struct nvkm_fb *fb, struct nvkm_ram **pram)
{
        struct nv50_ram *ram;
        int ret, i;

        if (!(ram = kzalloc(sizeof(*ram), GFP_KERNEL)))
                return -ENOMEM;
        *pram = &ram->base;

        ret = nv50_ram_ctor(&nv50_ram_func, fb, &ram->base);
        if (ret)
                return ret;

        ram->hwsq.r_0x002504 = hwsq_reg(0x002504);
        ram->hwsq.r_0x00c040 = hwsq_reg(0x00c040);
        ram->hwsq.r_0x004008 = hwsq_reg(0x004008);
        ram->hwsq.r_0x00400c = hwsq_reg(0x00400c);
        ram->hwsq.r_0x100200 = hwsq_reg(0x100200);
        ram->hwsq.r_0x100210 = hwsq_reg(0x100210);
        ram->hwsq.r_0x10021c = hwsq_reg(0x10021c);
        ram->hwsq.r_0x1002d0 = hwsq_reg(0x1002d0);
        ram->hwsq.r_0x1002d4 = hwsq_reg(0x1002d4);
        ram->hwsq.r_0x1002dc = hwsq_reg(0x1002dc);
        ram->hwsq.r_0x10053c = hwsq_reg(0x10053c);
        ram->hwsq.r_0x1005a0 = hwsq_reg(0x1005a0);
        ram->hwsq.r_0x1005a4 = hwsq_reg(0x1005a4);
        ram->hwsq.r_0x100710 = hwsq_reg(0x100710);
        ram->hwsq.r_0x100714 = hwsq_reg(0x100714);
        ram->hwsq.r_0x100718 = hwsq_reg(0x100718);
        ram->hwsq.r_0x10071c = hwsq_reg(0x10071c);
        ram->hwsq.r_0x100da0 = hwsq_stride(0x100da0, 4, ram->base.part_mask);
        ram->hwsq.r_0x100e20 = hwsq_reg(0x100e20);
        ram->hwsq.r_0x100e24 = hwsq_reg(0x100e24);
        ram->hwsq.r_0x611200 = hwsq_reg(0x611200);

        for (i = 0; i < 9; i++)
                ram->hwsq.r_timing[i] = hwsq_reg(0x100220 + (i * 0x04));

        if (ram->base.ranks > 1) {
                ram->hwsq.r_mr[0] = hwsq_reg2(0x1002c0, 0x1002c8);
                ram->hwsq.r_mr[1] = hwsq_reg2(0x1002c4, 0x1002cc);
                ram->hwsq.r_mr[2] = hwsq_reg2(0x1002e0, 0x1002e8);
                ram->hwsq.r_mr[3] = hwsq_reg2(0x1002e4, 0x1002ec);
        } else {
                ram->hwsq.r_mr[0] = hwsq_reg(0x1002c0);
                ram->hwsq.r_mr[1] = hwsq_reg(0x1002c4);
                ram->hwsq.r_mr[2] = hwsq_reg(0x1002e0);
                ram->hwsq.r_mr[3] = hwsq_reg(0x1002e4);
        }

        ram->hwsq.r_gpio[0] = hwsq_reg(0x00e104);
        ram->hwsq.r_gpio[1] = hwsq_reg(0x00e108);
        ram->hwsq.r_gpio[2] = hwsq_reg(0x00e120);
        ram->hwsq.r_gpio[3] = hwsq_reg(0x00e124);

        return 0;
}