/*
 * 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
 *          Roy Spliet <rspliet@eclipso.eu>
 */
#define gt215_ram(p) container_of((p), struct gt215_ram, base)
#include "ram.h"
#include "ramfuc.h"

#include <core/memory.h>
#include <core/option.h>
#include <subdev/bios.h>
#include <subdev/bios/M0205.h>
#include <subdev/bios/rammap.h>
#include <subdev/bios/timing.h>
#include <subdev/clk/gt215.h>
#include <subdev/gpio.h>

struct gt215_ramfuc {
        struct ramfuc base;
        struct ramfuc_reg r_0x001610;
        struct ramfuc_reg r_0x001700;
        struct ramfuc_reg r_0x002504;
        struct ramfuc_reg r_0x004000;
        struct ramfuc_reg r_0x004004;
        struct ramfuc_reg r_0x004018;
        struct ramfuc_reg r_0x004128;
        struct ramfuc_reg r_0x004168;
        struct ramfuc_reg r_0x100080;
        struct ramfuc_reg r_0x100200;
        struct ramfuc_reg r_0x100210;
        struct ramfuc_reg r_0x100220[9];
        struct ramfuc_reg r_0x100264;
        struct ramfuc_reg r_0x1002d0;
        struct ramfuc_reg r_0x1002d4;
        struct ramfuc_reg r_0x1002dc;
        struct ramfuc_reg r_0x10053c;
        struct ramfuc_reg r_0x1005a0;
        struct ramfuc_reg r_0x1005a4;
        struct ramfuc_reg r_0x100700;
        struct ramfuc_reg r_0x100714;
        struct ramfuc_reg r_0x100718;
        struct ramfuc_reg r_0x10071c;
        struct ramfuc_reg r_0x100720;
        struct ramfuc_reg r_0x100760;
        struct ramfuc_reg r_0x1007a0;
        struct ramfuc_reg r_0x1007e0;
        struct ramfuc_reg r_0x100da0;
        struct ramfuc_reg r_0x10f804;
        struct ramfuc_reg r_0x1110e0;
        struct ramfuc_reg r_0x111100;
        struct ramfuc_reg r_0x111104;
        struct ramfuc_reg r_0x1111e0;
        struct ramfuc_reg r_0x111400;
        struct ramfuc_reg r_0x611200;
        struct ramfuc_reg r_mr[4];
        struct ramfuc_reg r_gpio[4];
};

struct gt215_ltrain {
        enum {
                NVA3_TRAIN_UNKNOWN,
                NVA3_TRAIN_UNSUPPORTED,
                NVA3_TRAIN_ONCE,
                NVA3_TRAIN_EXEC,
                NVA3_TRAIN_DONE
        } state;
        u32 r_100720;
        u32 r_1111e0;
        u32 r_111400;
        struct nvkm_memory *memory;
};

struct gt215_ram {
        struct nvkm_ram base;
        struct gt215_ramfuc fuc;
        struct gt215_ltrain ltrain;
};

static void
gt215_link_train_calc(u32 *vals, struct gt215_ltrain *train)
{
        int i, lo, hi;
        u8 median[8], bins[4] = {0, 0, 0, 0}, bin = 0, qty = 0;

        for (i = 0; i < 8; i++) {
                for (lo = 0; lo < 0x40; lo++) {
                        if (!(vals[lo] & 0x80000000))
                                continue;
                        if (vals[lo] & (0x101 << i))
                                break;
                }

                if (lo == 0x40)
                        return;

                for (hi = lo + 1; hi < 0x40; hi++) {
                        if (!(vals[lo] & 0x80000000))
                                continue;
                        if (!(vals[hi] & (0x101 << i))) {
                                hi--;
                                break;
                        }
                }

                median[i] = ((hi - lo) >> 1) + lo;
                bins[(median[i] & 0xf0) >> 4]++;
                median[i] += 0x30;
        }

        /* Find the best value for 0x1111e0 */
        for (i = 0; i < 4; i++) {
                if (bins[i] > qty) {
                        bin = i + 3;
                        qty = bins[i];
                }
        }

        train->r_100720 = 0;
        for (i = 0; i < 8; i++) {
                median[i] = max(median[i], (u8) (bin << 4));
                median[i] = min(median[i], (u8) ((bin << 4) | 0xf));

                train->r_100720 |= ((median[i] & 0x0f) << (i << 2));
        }

        train->r_1111e0 = 0x02000000 | (bin * 0x101);
        train->r_111400 = 0x0;
}

/*
 * Link training for (at least) DDR3
 */
static int
gt215_link_train(struct gt215_ram *ram)
{
        struct gt215_ltrain *train = &ram->ltrain;
        struct gt215_ramfuc *fuc = &ram->fuc;
        struct nvkm_subdev *subdev = &ram->base.fb->subdev;
        struct nvkm_device *device = subdev->device;
        struct nvkm_bios *bios = device->bios;
        struct nvkm_clk *clk = device->clk;
        u32 *result, r1700;
        int ret, i;
        struct nvbios_M0205T M0205T = { 0 };
        u8 ver, hdr, cnt, len, snr, ssz;
        unsigned int clk_current;
        unsigned long flags;
        unsigned long *f = &flags;

        if (nvkm_boolopt(device->cfgopt, "NvMemExec", true) != true)
                return -ENOSYS;

        /* XXX: Multiple partitions? */
        result = kmalloc_array(64, sizeof(u32), GFP_KERNEL);
        if (!result)
                return -ENOMEM;

        train->state = NVA3_TRAIN_EXEC;

        /* Clock speeds for training and back */
        nvbios_M0205Tp(bios, &ver, &hdr, &cnt, &len, &snr, &ssz, &M0205T);
        if (M0205T.freq == 0) {
                kfree(result);
                return -ENOENT;
        }

        clk_current = nvkm_clk_read(clk, nv_clk_src_mem);

        ret = gt215_clk_pre(clk, f);
        if (ret)
                goto out;

        /* First: clock up/down */
        ret = ram->base.func->calc(&ram->base, (u32) M0205T.freq * 1000);
        if (ret)
                goto out;

        /* Do this *after* calc, eliminates write in script */
        nvkm_wr32(device, 0x111400, 0x00000000);
        /* XXX: Magic writes that improve train reliability? */
        nvkm_mask(device, 0x100674, 0x0000ffff, 0x00000000);
        nvkm_mask(device, 0x1005e4, 0x0000ffff, 0x00000000);
        nvkm_mask(device, 0x100b0c, 0x000000ff, 0x00000000);
        nvkm_wr32(device, 0x100c04, 0x00000400);

        /* Now the training script */
        r1700 = ram_rd32(fuc, 0x001700);

        ram_mask(fuc, 0x100200, 0x00000800, 0x00000000);
        ram_wr32(fuc, 0x611200, 0x3300);
        ram_wait_vblank(fuc);
        ram_wait(fuc, 0x611200, 0x00000003, 0x00000000, 500000);
        ram_mask(fuc, 0x001610, 0x00000083, 0x00000003);
        ram_mask(fuc, 0x100080, 0x00000020, 0x00000000);
        ram_mask(fuc, 0x10f804, 0x80000000, 0x00000000);
        ram_wr32(fuc, 0x001700, 0x00000000);

        ram_train(fuc);

        /* Reset */
        ram_mask(fuc, 0x10f804, 0x80000000, 0x80000000);
        ram_wr32(fuc, 0x10053c, 0x0);
        ram_wr32(fuc, 0x100720, train->r_100720);
        ram_wr32(fuc, 0x1111e0, train->r_1111e0);
        ram_wr32(fuc, 0x111400, train->r_111400);
        ram_nuke(fuc, 0x100080);
        ram_mask(fuc, 0x100080, 0x00000020, 0x00000020);
        ram_nsec(fuc, 1000);

        ram_wr32(fuc, 0x001700, r1700);
        ram_mask(fuc, 0x001610, 0x00000083, 0x00000080);
        ram_wr32(fuc, 0x611200, 0x3330);
        ram_mask(fuc, 0x100200, 0x00000800, 0x00000800);

        ram_exec(fuc, true);

        ram->base.func->calc(&ram->base, clk_current);
        ram_exec(fuc, true);

        /* Post-processing, avoids flicker */
        nvkm_mask(device, 0x616308, 0x10, 0x10);
        nvkm_mask(device, 0x616b08, 0x10, 0x10);

        gt215_clk_post(clk, f);

        ram_train_result(ram->base.fb, result, 64);
        for (i = 0; i < 64; i++)
                nvkm_debug(subdev, "Train: %08x", result[i]);
        gt215_link_train_calc(result, train);

        nvkm_debug(subdev, "Train: %08x %08x %08x", train->r_100720,
                   train->r_1111e0, train->r_111400);

        kfree(result);

        train->state = NVA3_TRAIN_DONE;

        return ret;

out:
        if(ret == -EBUSY)
                f = NULL;

        train->state = NVA3_TRAIN_UNSUPPORTED;

        gt215_clk_post(clk, f);
        kfree(result);
        return ret;
}

static int
gt215_link_train_init(struct gt215_ram *ram)
{
        static const u32 pattern[16] = {
                0xaaaaaaaa, 0xcccccccc, 0xdddddddd, 0xeeeeeeee,
                0x00000000, 0x11111111, 0x44444444, 0xdddddddd,
                0x33333333, 0x55555555, 0x77777777, 0x66666666,
                0x99999999, 0x88888888, 0xeeeeeeee, 0xbbbbbbbb,
        };
        struct gt215_ltrain *train = &ram->ltrain;
        struct nvkm_device *device = ram->base.fb->subdev.device;
        struct nvkm_bios *bios = device->bios;
        struct nvbios_M0205E M0205E;
        u8 ver, hdr, cnt, len;
        u32 r001700;
        u64 addr;
        int ret, i = 0;

        train->state = NVA3_TRAIN_UNSUPPORTED;

        /* We support type "5"
         * XXX: training pattern table appears to be unused for this routine */
        if (!nvbios_M0205Ep(bios, i, &ver, &hdr, &cnt, &len, &M0205E))
                return -ENOENT;

        if (M0205E.type != 5)
                return 0;

        train->state = NVA3_TRAIN_ONCE;

        ret = nvkm_ram_get(device, NVKM_RAM_MM_NORMAL, 0x01, 16, 0x8000,
                           true, true, &ram->ltrain.memory);
        if (ret)
                return ret;

        addr = nvkm_memory_addr(ram->ltrain.memory);

        nvkm_wr32(device, 0x100538, 0x10000000 | (addr >> 16));
        nvkm_wr32(device, 0x1005a8, 0x0000ffff);
        nvkm_mask(device, 0x10f800, 0x00000001, 0x00000001);

        for (i = 0; i < 0x30; i++) {
                nvkm_wr32(device, 0x10f8c0, (i << 8) | i);
                nvkm_wr32(device, 0x10f900, pattern[i % 16]);
        }

        for (i = 0; i < 0x30; i++) {
                nvkm_wr32(device, 0x10f8e0, (i << 8) | i);
                nvkm_wr32(device, 0x10f920, pattern[i % 16]);
        }

        /* And upload the pattern */
        r001700 = nvkm_rd32(device, 0x1700);
        nvkm_wr32(device, 0x1700, addr >> 16);
        for (i = 0; i < 16; i++)
                nvkm_wr32(device, 0x700000 + (i << 2), pattern[i]);
        for (i = 0; i < 16; i++)
                nvkm_wr32(device, 0x700100 + (i << 2), pattern[i]);
        nvkm_wr32(device, 0x1700, r001700);

        train->r_100720 = nvkm_rd32(device, 0x100720);
        train->r_1111e0 = nvkm_rd32(device, 0x1111e0);
        train->r_111400 = nvkm_rd32(device, 0x111400);
        return 0;
}

static void
gt215_link_train_fini(struct gt215_ram *ram)
{
        nvkm_memory_unref(&ram->ltrain.memory);
}

/*
 * RAM reclocking
 */
#define T(t) cfg->timing_10_##t
static int
gt215_ram_timing_calc(struct gt215_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;
        int tUNK_base, tUNK_40_0, prevCL;
        u32 cur2, cur3, cur7, cur8;

        cur2 = nvkm_rd32(device, 0x100228);
        cur3 = nvkm_rd32(device, 0x10022c);
        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;
        }

        prevCL = (cur3 & 0x000000ff) + 1;
        tUNK_base = ((cur7 & 0x00ff0000) >> 16) - prevCL;

        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 |
                    (5 + T(CL) - T(CWL));
        timing[2] = (T(CWL) - 1) << 24 |
                    (T(RRD) << 16) |
                    (T(RCDWR) << 8) |
                    T(RCDRD);
        timing[3] = (cur3 & 0x00ff0000) |
                    (0x30 + T(CL)) << 24 |
                    (0xb + T(CL)) << 8 |
                    (T(CL) - 1);
        timing[4] = T(20) << 24 |
                    T(21) << 16 |
                    T(13) << 8 |
                    T(13);
        timing[5] = T(RFC) << 24 |
                    max_t(u8,T(RCDRD), T(RCDWR)) << 16 |
                    max_t(u8, (T(CWL) + 6), (T(CL) + 2)) << 8 |
                    T(RP);
        timing[6] = (0x5a + T(CL)) << 16 |
                    max_t(u8, 1, (6 - T(CL) + T(CWL))) << 8 |
                    (0x50 + T(CL) - T(CWL));
        timing[7] = (cur7 & 0xff000000) |
                    ((tUNK_base + T(CL)) << 16) |
                    0x202;
        timing[8] = cur8 & 0xffffff00;

        switch (ram->base.type) {
        case NVKM_RAM_TYPE_DDR2:
        case NVKM_RAM_TYPE_GDDR3:
                tUNK_40_0 = prevCL - (cur8 & 0xff);
                if (tUNK_40_0 > 0)
                        timing[8] |= T(CL);
                break;
        default:
                break;
        }

        nvkm_debug(subdev, "Entry: 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;
}
#undef T

static void
nvkm_sddr2_dll_reset(struct gt215_ramfuc *fuc)
{
        ram_mask(fuc, mr[0], 0x100, 0x100);
        ram_nsec(fuc, 1000);
        ram_mask(fuc, mr[0], 0x100, 0x000);
        ram_nsec(fuc, 1000);
}

static void
nvkm_sddr3_dll_disable(struct gt215_ramfuc *fuc, u32 *mr)
{
        u32 mr1_old = ram_rd32(fuc, mr[1]);

        if (!(mr1_old & 0x1)) {
                ram_wr32(fuc, 0x1002d4, 0x00000001);
                ram_wr32(fuc, mr[1], mr[1]);
                ram_nsec(fuc, 1000);
        }
}

static void
nvkm_gddr3_dll_disable(struct gt215_ramfuc *fuc, u32 *mr)
{
        u32 mr1_old = ram_rd32(fuc, mr[1]);

        if (!(mr1_old & 0x40)) {
                ram_wr32(fuc, mr[1], mr[1]);
                ram_nsec(fuc, 1000);
        }
}

static void
gt215_ram_lock_pll(struct gt215_ramfuc *fuc, struct gt215_clk_info *mclk)
{
        ram_wr32(fuc, 0x004004, mclk->pll);
        ram_mask(fuc, 0x004000, 0x00000001, 0x00000001);
        ram_mask(fuc, 0x004000, 0x00000010, 0x00000000);
        ram_wait(fuc, 0x004000, 0x00020000, 0x00020000, 64000);
        ram_mask(fuc, 0x004000, 0x00000010, 0x00000010);
}

static void
gt215_ram_gpio(struct gt215_ramfuc *fuc, u8 tag, u32 val)
{
        struct nvkm_gpio *gpio = fuc->base.fb->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(fuc, gpio[reg]);
                if (gpio_val & (8 << sh))
                        val = !val;
                if (!(func.log[1] & 1))
                        val = !val;

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

static int
gt215_ram_calc(struct nvkm_ram *base, u32 freq)
{
        struct gt215_ram *ram = gt215_ram(base);
        struct gt215_ramfuc *fuc = &ram->fuc;
        struct gt215_ltrain *train = &ram->ltrain;
        struct nvkm_subdev *subdev = &ram->base.fb->subdev;
        struct nvkm_device *device = subdev->device;
        struct nvkm_bios *bios = device->bios;
        struct gt215_clk_info mclk;
        struct nvkm_gpio *gpio = device->gpio;
        struct nvkm_ram_data *next;
        u8  ver, hdr, cnt, len, strap;
        u32 data;
        u32 r004018, r100760, r100da0, r111100, ctrl;
        u32 unk714, unk718, unk71c;
        int ret, i;
        u32 timing[9];
        bool pll2pll;

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

        if (ram->ltrain.state == NVA3_TRAIN_ONCE)
                gt215_link_train(ram);

        /* lookup memory config data relevant to the target frequency */
        data = nvbios_rammapEm(bios, freq / 1000, &ver, &hdr, &cnt, &len,
                               &next->bios);
        if (!data || ver != 0x10 || hdr < 0x05) {
                nvkm_error(subdev, "invalid/missing rammap entry\n");
                return -EINVAL;
        }

        /* 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(bios, data, ver, hdr, cnt, len, strap,
                               &ver, &hdr, &next->bios);
        if (!data || ver != 0x10 || hdr < 0x09) {
                nvkm_error(subdev, "invalid/missing ramcfg entry\n");
                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 < 0x17) {
                        nvkm_error(subdev, "invalid/missing timing entry\n");
                        return -EINVAL;
                }
        }

        ret = gt215_pll_info(device->clk, 0x12, 0x4000, freq, &mclk);
        if (ret < 0) {
                nvkm_error(subdev, "failed mclk calculation\n");
                return ret;
        }

        gt215_ram_timing_calc(ram, timing);

        ret = ram_init(fuc, ram->base.fb);
        if (ret)
                return ret;

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

        switch (ram->base.type) {
        case NVKM_RAM_TYPE_DDR2:
                ret = nvkm_sddr2_calc(&ram->base);
                break;
        case NVKM_RAM_TYPE_DDR3:
                ret = nvkm_sddr3_calc(&ram->base);
                break;
        case NVKM_RAM_TYPE_GDDR3:
                ret = nvkm_gddr3_calc(&ram->base);
                break;
        default:
                ret = -ENOSYS;
                break;
        }

        if (ret)
                return ret;

        /* XXX: 750MHz seems rather arbitrary */
        if (freq <= 750000) {
                r004018 = 0x10000000;
                r100760 = 0x22222222;
                r100da0 = 0x00000010;
        } else {
                r004018 = 0x00000000;
                r100760 = 0x00000000;
                r100da0 = 0x00000000;
        }

        if (!next->bios.ramcfg_DLLoff)
                r004018 |= 0x00004000;

        /* pll2pll requires to switch to a safe clock first */
        ctrl = ram_rd32(fuc, 0x004000);
        pll2pll = (!(ctrl & 0x00000008)) && mclk.pll;

        /* Pre, NVIDIA does this outside the script */
        if (next->bios.ramcfg_10_02_10) {
                ram_mask(fuc, 0x111104, 0x00000600, 0x00000000);
        } else {
                ram_mask(fuc, 0x111100, 0x40000000, 0x40000000);
                ram_mask(fuc, 0x111104, 0x00000180, 0x00000000);
        }
        /* Always disable this bit during reclock */
        ram_mask(fuc, 0x100200, 0x00000800, 0x00000000);

        /* If switching from non-pll to pll, lock before disabling FB */
        if (mclk.pll && !pll2pll) {
                ram_mask(fuc, 0x004128, 0x003f3141, mclk.clk | 0x00000101);
                gt215_ram_lock_pll(fuc, &mclk);
        }

        /* Start with disabling some CRTCs and PFIFO? */
        ram_wait_vblank(fuc);
        ram_wr32(fuc, 0x611200, 0x3300);
        ram_mask(fuc, 0x002504, 0x1, 0x1);
        ram_nsec(fuc, 10000);
        ram_wait(fuc, 0x002504, 0x10, 0x10, 20000); /* XXX: or longer? */
        ram_block(fuc);
        ram_nsec(fuc, 2000);

        if (!next->bios.ramcfg_10_02_10) {
                if (ram->base.type == NVKM_RAM_TYPE_GDDR3)
                        ram_mask(fuc, 0x111100, 0x04020000, 0x00020000);
                else
                        ram_mask(fuc, 0x111100, 0x04020000, 0x04020000);
        }

        /* If we're disabling the DLL, do it now */
        switch (next->bios.ramcfg_DLLoff * ram->base.type) {
        case NVKM_RAM_TYPE_DDR3:
                nvkm_sddr3_dll_disable(fuc, ram->base.mr);
                break;
        case NVKM_RAM_TYPE_GDDR3:
                nvkm_gddr3_dll_disable(fuc, ram->base.mr);
                break;
        }

        if (next->bios.timing_10_ODT)
                gt215_ram_gpio(fuc, 0x2e, 1);

        /* Brace RAM for impact */
        ram_wr32(fuc, 0x1002d4, 0x00000001);
        ram_wr32(fuc, 0x1002d0, 0x00000001);
        ram_wr32(fuc, 0x1002d0, 0x00000001);
        ram_wr32(fuc, 0x100210, 0x00000000);
        ram_wr32(fuc, 0x1002dc, 0x00000001);
        ram_nsec(fuc, 2000);

        if (device->chipset == 0xa3 && freq <= 500000)
                ram_mask(fuc, 0x100700, 0x00000006, 0x00000006);

        /* Alter FBVDD/Q, apparently must be done with PLL disabled, thus
         * set it to bypass */
        if (nvkm_gpio_get(gpio, 0, 0x18, DCB_GPIO_UNUSED) ==
                        next->bios.ramcfg_FBVDDQ) {
                data = ram_rd32(fuc, 0x004000) & 0x9;

                if (data == 0x1)
                        ram_mask(fuc, 0x004000, 0x8, 0x8);
                if (data & 0x1)
                        ram_mask(fuc, 0x004000, 0x1, 0x0);

                gt215_ram_gpio(fuc, 0x18, !next->bios.ramcfg_FBVDDQ);

                if (data & 0x1)
                        ram_mask(fuc, 0x004000, 0x1, 0x1);
        }

        /* Fiddle with clocks */
        /* There's 4 scenario's
         * pll->pll: first switch to a 324MHz clock, set up new PLL, switch
         * clk->pll: Set up new PLL, switch
         * pll->clk: Set up clock, switch
         * clk->clk: Overwrite ctrl and other bits, switch */

        /* Switch to regular clock - 324MHz */
        if (pll2pll) {
                ram_mask(fuc, 0x004000, 0x00000004, 0x00000004);
                ram_mask(fuc, 0x004168, 0x003f3141, 0x00083101);
                ram_mask(fuc, 0x004000, 0x00000008, 0x00000008);
                ram_mask(fuc, 0x1110e0, 0x00088000, 0x00088000);
                ram_wr32(fuc, 0x004018, 0x00001000);
                gt215_ram_lock_pll(fuc, &mclk);
        }

        if (mclk.pll) {
                ram_mask(fuc, 0x004000, 0x00000105, 0x00000105);
                ram_wr32(fuc, 0x004018, 0x00001000 | r004018);
                ram_wr32(fuc, 0x100da0, r100da0);
        } else {
                ram_mask(fuc, 0x004168, 0x003f3141, mclk.clk | 0x00000101);
                ram_mask(fuc, 0x004000, 0x00000108, 0x00000008);
                ram_mask(fuc, 0x1110e0, 0x00088000, 0x00088000);
                ram_wr32(fuc, 0x004018, 0x00009000 | r004018);
                ram_wr32(fuc, 0x100da0, r100da0);
        }
        ram_nsec(fuc, 20000);

        if (next->bios.rammap_10_04_08) {
                ram_wr32(fuc, 0x1005a0, next->bios.ramcfg_10_06 << 16 |
                                        next->bios.ramcfg_10_05 << 8 |
                                        next->bios.ramcfg_10_05);
                ram_wr32(fuc, 0x1005a4, next->bios.ramcfg_10_08 << 8 |
                                        next->bios.ramcfg_10_07);
                ram_wr32(fuc, 0x10f804, next->bios.ramcfg_10_09_f0 << 20 |
                                        next->bios.ramcfg_10_03_0f << 16 |
                                        next->bios.ramcfg_10_09_0f |
                                        0x80000000);
                ram_mask(fuc, 0x10053c, 0x00001000, 0x00000000);
        } else {
                if (train->state == NVA3_TRAIN_DONE) {
                        ram_wr32(fuc, 0x100080, 0x1020);
                        ram_mask(fuc, 0x111400, 0xffffffff, train->r_111400);
                        ram_mask(fuc, 0x1111e0, 0xffffffff, train->r_1111e0);
                        ram_mask(fuc, 0x100720, 0xffffffff, train->r_100720);
                }
                ram_mask(fuc, 0x10053c, 0x00001000, 0x00001000);
                ram_mask(fuc, 0x10f804, 0x80000000, 0x00000000);
                ram_mask(fuc, 0x100760, 0x22222222, r100760);
                ram_mask(fuc, 0x1007a0, 0x22222222, r100760);
                ram_mask(fuc, 0x1007e0, 0x22222222, r100760);
        }

        if (device->chipset == 0xa3 && freq > 500000) {
                ram_mask(fuc, 0x100700, 0x00000006, 0x00000000);
        }

        /* Final switch */
        if (mclk.pll) {
                ram_mask(fuc, 0x1110e0, 0x00088000, 0x00011000);
                ram_mask(fuc, 0x004000, 0x00000008, 0x00000000);
        }

        ram_wr32(fuc, 0x1002dc, 0x00000000);
        ram_wr32(fuc, 0x1002d4, 0x00000001);
        ram_wr32(fuc, 0x100210, 0x80000000);
        ram_nsec(fuc, 2000);

        /* Set RAM MR parameters and timings */
        for (i = 2; i >= 0; i--) {
                if (ram_rd32(fuc, mr[i]) != ram->base.mr[i]) {
                        ram_wr32(fuc, mr[i], ram->base.mr[i]);
                        ram_nsec(fuc, 1000);
                }
        }

        ram_wr32(fuc, 0x100220[3], timing[3]);
        ram_wr32(fuc, 0x100220[1], timing[1]);
        ram_wr32(fuc, 0x100220[6], timing[6]);
        ram_wr32(fuc, 0x100220[7], timing[7]);
        ram_wr32(fuc, 0x100220[2], timing[2]);
        ram_wr32(fuc, 0x100220[4], timing[4]);
        ram_wr32(fuc, 0x100220[5], timing[5]);
        ram_wr32(fuc, 0x100220[0], timing[0]);
        ram_wr32(fuc, 0x100220[8], timing[8]);

        /* Misc */
        ram_mask(fuc, 0x100200, 0x00001000, !next->bios.ramcfg_10_02_08 << 12);

        /* XXX: A lot of "chipset"/"ram type" specific stuff...? */
        unk714  = ram_rd32(fuc, 0x100714) & ~0xf0000130;
        unk718  = ram_rd32(fuc, 0x100718) & ~0x00000100;
        unk71c  = ram_rd32(fuc, 0x10071c) & ~0x00000100;
        r111100 = ram_rd32(fuc, 0x111100) & ~0x3a800000;

        /* NVA8 seems to skip various bits related to ramcfg_10_02_04 */
        if (device->chipset == 0xa8) {
                r111100 |= 0x08000000;
                if (!next->bios.ramcfg_10_02_04)
                        unk714  |= 0x00000010;
        } else {
                if (next->bios.ramcfg_10_02_04) {
                        switch (ram->base.type) {
                        case NVKM_RAM_TYPE_DDR2:
                        case NVKM_RAM_TYPE_DDR3:
                                r111100 &= ~0x00000020;
                                if (next->bios.ramcfg_10_02_10)
                                        r111100 |= 0x08000004;
                                else
                                        r111100 |= 0x00000024;
                                break;
                        default:
                                break;
                        }
                } else {
                        switch (ram->base.type) {
                        case NVKM_RAM_TYPE_DDR2:
                        case NVKM_RAM_TYPE_DDR3:
                                r111100 &= ~0x00000024;
                                r111100 |=  0x12800000;

                                if (next->bios.ramcfg_10_02_10)
                                        r111100 |= 0x08000000;
                                unk714  |= 0x00000010;
                                break;
                        case NVKM_RAM_TYPE_GDDR3:
                                r111100 |= 0x30000000;
                                unk714  |= 0x00000020;
                                break;
                        default:
                                break;
                        }
                }
        }

        unk714 |= (next->bios.ramcfg_10_04_01) << 8;

        if (next->bios.ramcfg_10_02_20)
                unk714 |= 0xf0000000;
        if (next->bios.ramcfg_10_02_02)
                unk718 |= 0x00000100;
        if (next->bios.ramcfg_10_02_01)
                unk71c |= 0x00000100;
        if (next->bios.timing_10_24 != 0xff) {
                unk718 &= ~0xf0000000;
                unk718 |= next->bios.timing_10_24 << 28;
        }
        if (next->bios.ramcfg_10_02_10)
                r111100 &= ~0x04020000;

        ram_mask(fuc, 0x100714, 0xffffffff, unk714);
        ram_mask(fuc, 0x10071c, 0xffffffff, unk71c);
        ram_mask(fuc, 0x100718, 0xffffffff, unk718);
        ram_mask(fuc, 0x111100, 0xffffffff, r111100);

        if (!next->bios.timing_10_ODT)
                gt215_ram_gpio(fuc, 0x2e, 0);

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

        if (ram->base.type == NVKM_RAM_TYPE_GDDR3) {
                ram_nsec(fuc, 31000);
        } else {
                ram_nsec(fuc, 14000);
        }

        if (ram->base.type == NVKM_RAM_TYPE_DDR3) {
                ram_wr32(fuc, 0x100264, 0x1);
                ram_nsec(fuc, 2000);
        }

        ram_nuke(fuc, 0x100700);
        ram_mask(fuc, 0x100700, 0x01000000, 0x01000000);
        ram_mask(fuc, 0x100700, 0x01000000, 0x00000000);

        /* Re-enable FB */
        ram_unblock(fuc);
        ram_wr32(fuc, 0x611200, 0x3330);

        /* Post fiddlings */
        if (next->bios.rammap_10_04_02)
                ram_mask(fuc, 0x100200, 0x00000800, 0x00000800);
        if (next->bios.ramcfg_10_02_10) {
                ram_mask(fuc, 0x111104, 0x00000180, 0x00000180);
                ram_mask(fuc, 0x111100, 0x40000000, 0x00000000);
        } else {
                ram_mask(fuc, 0x111104, 0x00000600, 0x00000600);
        }

        if (mclk.pll) {
                ram_mask(fuc, 0x004168, 0x00000001, 0x00000000);
                ram_mask(fuc, 0x004168, 0x00000100, 0x00000000);
        } else {
                ram_mask(fuc, 0x004000, 0x00000001, 0x00000000);
                ram_mask(fuc, 0x004128, 0x00000001, 0x00000000);
                ram_mask(fuc, 0x004128, 0x00000100, 0x00000000);
        }

        return 0;
}

static int
gt215_ram_prog(struct nvkm_ram *base)
{
        struct gt215_ram *ram = gt215_ram(base);
        struct gt215_ramfuc *fuc = &ram->fuc;
        struct nvkm_device *device = ram->base.fb->subdev.device;
        bool exec = nvkm_boolopt(device->cfgopt, "NvMemExec", true);

        if (exec) {
                nvkm_mask(device, 0x001534, 0x2, 0x2);

                ram_exec(fuc, true);

                /* Post-processing, avoids flicker */
                nvkm_mask(device, 0x002504, 0x1, 0x0);
                nvkm_mask(device, 0x001534, 0x2, 0x0);

                nvkm_mask(device, 0x616308, 0x10, 0x10);
                nvkm_mask(device, 0x616b08, 0x10, 0x10);
        } else {
                ram_exec(fuc, false);
        }
        return 0;
}

static void
gt215_ram_tidy(struct nvkm_ram *base)
{
        struct gt215_ram *ram = gt215_ram(base);
        ram_exec(&ram->fuc, false);
}

static int
gt215_ram_init(struct nvkm_ram *base)
{
        struct gt215_ram *ram = gt215_ram(base);
        gt215_link_train_init(ram);
        return 0;
}

static void *
gt215_ram_dtor(struct nvkm_ram *base)
{
        struct gt215_ram *ram = gt215_ram(base);
        gt215_link_train_fini(ram);
        return ram;
}

static const struct nvkm_ram_func
gt215_ram_func = {
        .dtor = gt215_ram_dtor,
        .init = gt215_ram_init,
        .calc = gt215_ram_calc,
        .prog = gt215_ram_prog,
        .tidy = gt215_ram_tidy,
};

int
gt215_ram_new(struct nvkm_fb *fb, struct nvkm_ram **pram)
{
        struct gt215_ram *ram;
        int ret, i;

        if (!(ram = kzalloc_obj(*ram)))
                return -ENOMEM;
        *pram = &ram->base;

        ret = nv50_ram_ctor(&gt215_ram_func, fb, &ram->base);
        if (ret)
                return ret;

        ram->fuc.r_0x001610 = ramfuc_reg(0x001610);
        ram->fuc.r_0x001700 = ramfuc_reg(0x001700);
        ram->fuc.r_0x002504 = ramfuc_reg(0x002504);
        ram->fuc.r_0x004000 = ramfuc_reg(0x004000);
        ram->fuc.r_0x004004 = ramfuc_reg(0x004004);
        ram->fuc.r_0x004018 = ramfuc_reg(0x004018);
        ram->fuc.r_0x004128 = ramfuc_reg(0x004128);
        ram->fuc.r_0x004168 = ramfuc_reg(0x004168);
        ram->fuc.r_0x100080 = ramfuc_reg(0x100080);
        ram->fuc.r_0x100200 = ramfuc_reg(0x100200);
        ram->fuc.r_0x100210 = ramfuc_reg(0x100210);
        for (i = 0; i < 9; i++)
                ram->fuc.r_0x100220[i] = ramfuc_reg(0x100220 + (i * 4));
        ram->fuc.r_0x100264 = ramfuc_reg(0x100264);
        ram->fuc.r_0x1002d0 = ramfuc_reg(0x1002d0);
        ram->fuc.r_0x1002d4 = ramfuc_reg(0x1002d4);
        ram->fuc.r_0x1002dc = ramfuc_reg(0x1002dc);
        ram->fuc.r_0x10053c = ramfuc_reg(0x10053c);
        ram->fuc.r_0x1005a0 = ramfuc_reg(0x1005a0);
        ram->fuc.r_0x1005a4 = ramfuc_reg(0x1005a4);
        ram->fuc.r_0x100700 = ramfuc_reg(0x100700);
        ram->fuc.r_0x100714 = ramfuc_reg(0x100714);
        ram->fuc.r_0x100718 = ramfuc_reg(0x100718);
        ram->fuc.r_0x10071c = ramfuc_reg(0x10071c);
        ram->fuc.r_0x100720 = ramfuc_reg(0x100720);
        ram->fuc.r_0x100760 = ramfuc_stride(0x100760, 4, ram->base.part_mask);
        ram->fuc.r_0x1007a0 = ramfuc_stride(0x1007a0, 4, ram->base.part_mask);
        ram->fuc.r_0x1007e0 = ramfuc_stride(0x1007e0, 4, ram->base.part_mask);
        ram->fuc.r_0x100da0 = ramfuc_stride(0x100da0, 4, ram->base.part_mask);
        ram->fuc.r_0x10f804 = ramfuc_reg(0x10f804);
        ram->fuc.r_0x1110e0 = ramfuc_stride(0x1110e0, 4, ram->base.part_mask);
        ram->fuc.r_0x111100 = ramfuc_reg(0x111100);
        ram->fuc.r_0x111104 = ramfuc_reg(0x111104);
        ram->fuc.r_0x1111e0 = ramfuc_reg(0x1111e0);
        ram->fuc.r_0x111400 = ramfuc_reg(0x111400);
        ram->fuc.r_0x611200 = ramfuc_reg(0x611200);

        if (ram->base.ranks > 1) {
                ram->fuc.r_mr[0] = ramfuc_reg2(0x1002c0, 0x1002c8);
                ram->fuc.r_mr[1] = ramfuc_reg2(0x1002c4, 0x1002cc);
                ram->fuc.r_mr[2] = ramfuc_reg2(0x1002e0, 0x1002e8);
                ram->fuc.r_mr[3] = ramfuc_reg2(0x1002e4, 0x1002ec);
        } else {
                ram->fuc.r_mr[0] = ramfuc_reg(0x1002c0);
                ram->fuc.r_mr[1] = ramfuc_reg(0x1002c4);
                ram->fuc.r_mr[2] = ramfuc_reg(0x1002e0);
                ram->fuc.r_mr[3] = ramfuc_reg(0x1002e4);
        }
        ram->fuc.r_gpio[0] = ramfuc_reg(0x00e104);
        ram->fuc.r_gpio[1] = ramfuc_reg(0x00e108);
        ram->fuc.r_gpio[2] = ramfuc_reg(0x00e120);
        ram->fuc.r_gpio[3] = ramfuc_reg(0x00e124);

        return 0;
}