/*
 * Copyright 2006 Dave Airlie
 * Copyright 2007 Maarten Maathuis
 * Copyright 2007-2009 Stuart Bennett
 *
 * 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 AUTHORS 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.
 */

#include <drm/drmP.h>
#include "nouveau_drm.h"
#include "hw.h"

#include <subdev/bios/pll.h>
#include <subdev/clock.h>
#include <subdev/timer.h>

#define CHIPSET_NFORCE 0x01a0
#define CHIPSET_NFORCE2 0x01f0

/*
 * misc hw access wrappers/control functions
 */

void
NVWriteVgaSeq(struct drm_device *dev, int head, uint8_t index, uint8_t value)
{
        NVWritePRMVIO(dev, head, NV_PRMVIO_SRX, index);
        NVWritePRMVIO(dev, head, NV_PRMVIO_SR, value);
}

uint8_t
NVReadVgaSeq(struct drm_device *dev, int head, uint8_t index)
{
        NVWritePRMVIO(dev, head, NV_PRMVIO_SRX, index);
        return NVReadPRMVIO(dev, head, NV_PRMVIO_SR);
}

void
NVWriteVgaGr(struct drm_device *dev, int head, uint8_t index, uint8_t value)
{
        NVWritePRMVIO(dev, head, NV_PRMVIO_GRX, index);
        NVWritePRMVIO(dev, head, NV_PRMVIO_GX, value);
}

uint8_t
NVReadVgaGr(struct drm_device *dev, int head, uint8_t index)
{
        NVWritePRMVIO(dev, head, NV_PRMVIO_GRX, index);
        return NVReadPRMVIO(dev, head, NV_PRMVIO_GX);
}

/* CR44 takes values 0 (head A), 3 (head B) and 4 (heads tied)
 * it affects only the 8 bit vga io regs, which we access using mmio at
 * 0xc{0,2}3c*, 0x60{1,3}3*, and 0x68{1,3}3d*
 * in general, the set value of cr44 does not matter: reg access works as
 * expected and values can be set for the appropriate head by using a 0x2000
 * offset as required
 * however:
 * a) pre nv40, the head B range of PRMVIO regs at 0xc23c* was not exposed and
 *    cr44 must be set to 0 or 3 for accessing values on the correct head
 *    through the common 0xc03c* addresses
 * b) in tied mode (4) head B is programmed to the values set on head A, and
 *    access using the head B addresses can have strange results, ergo we leave
 *    tied mode in init once we know to what cr44 should be restored on exit
 *
 * the owner parameter is slightly abused:
 * 0 and 1 are treated as head values and so the set value is (owner * 3)
 * other values are treated as literal values to set
 */
void
NVSetOwner(struct drm_device *dev, int owner)
{
        struct nouveau_drm *drm = nouveau_drm(dev);

        if (owner == 1)
                owner *= 3;

        if (nv_device(drm->device)->chipset == 0x11) {
                /* This might seem stupid, but the blob does it and
                 * omitting it often locks the system up.
                 */
                NVReadVgaCrtc(dev, 0, NV_CIO_SR_LOCK_INDEX);
                NVReadVgaCrtc(dev, 1, NV_CIO_SR_LOCK_INDEX);
        }

        /* CR44 is always changed on CRTC0 */
        NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_44, owner);

        if (nv_device(drm->device)->chipset == 0x11) {  /* set me harder */
                NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_2E, owner);
                NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_2E, owner);
        }
}

void
NVBlankScreen(struct drm_device *dev, int head, bool blank)
{
        unsigned char seq1;

        if (nv_two_heads(dev))
                NVSetOwner(dev, head);

        seq1 = NVReadVgaSeq(dev, head, NV_VIO_SR_CLOCK_INDEX);

        NVVgaSeqReset(dev, head, true);
        if (blank)
                NVWriteVgaSeq(dev, head, NV_VIO_SR_CLOCK_INDEX, seq1 | 0x20);
        else
                NVWriteVgaSeq(dev, head, NV_VIO_SR_CLOCK_INDEX, seq1 & ~0x20);
        NVVgaSeqReset(dev, head, false);
}

/*
 * PLL getting
 */

static void
nouveau_hw_decode_pll(struct drm_device *dev, uint32_t reg1, uint32_t pll1,
                      uint32_t pll2, struct nouveau_pll_vals *pllvals)
{
        struct nouveau_drm *drm = nouveau_drm(dev);

        /* to force parsing as single stage (i.e. nv40 vplls) pass pll2 as 0 */

        /* log2P is & 0x7 as never more than 7, and nv30/35 only uses 3 bits */
        pllvals->log2P = (pll1 >> 16) & 0x7;
        pllvals->N2 = pllvals->M2 = 1;

        if (reg1 <= 0x405c) {
                pllvals->NM1 = pll2 & 0xffff;
                /* single stage NVPLL and VPLLs use 1 << 8, MPLL uses 1 << 12 */
                if (!(pll1 & 0x1100))
                        pllvals->NM2 = pll2 >> 16;
        } else {
                pllvals->NM1 = pll1 & 0xffff;
                if (nv_two_reg_pll(dev) && pll2 & NV31_RAMDAC_ENABLE_VCO2)
                        pllvals->NM2 = pll2 & 0xffff;
                else if (nv_device(drm->device)->chipset == 0x30 || nv_device(drm->device)->chipset == 0x35) {
                        pllvals->M1 &= 0xf; /* only 4 bits */
                        if (pll1 & NV30_RAMDAC_ENABLE_VCO2) {
                                pllvals->M2 = (pll1 >> 4) & 0x7;
                                pllvals->N2 = ((pll1 >> 21) & 0x18) |
                                              ((pll1 >> 19) & 0x7);
                        }
                }
        }
}

int
nouveau_hw_get_pllvals(struct drm_device *dev, enum nvbios_pll_type plltype,
                       struct nouveau_pll_vals *pllvals)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_device *device = nv_device(drm->device);
        struct nouveau_bios *bios = nouveau_bios(device);
        uint32_t reg1, pll1, pll2 = 0;
        struct nvbios_pll pll_lim;
        int ret;

        ret = nvbios_pll_parse(bios, plltype, &pll_lim);
        if (ret || !(reg1 = pll_lim.reg))
                return -ENOENT;

        pll1 = nv_rd32(device, reg1);
        if (reg1 <= 0x405c)
                pll2 = nv_rd32(device, reg1 + 4);
        else if (nv_two_reg_pll(dev)) {
                uint32_t reg2 = reg1 + (reg1 == NV_RAMDAC_VPLL2 ? 0x5c : 0x70);

                pll2 = nv_rd32(device, reg2);
        }

        if (nv_device(drm->device)->card_type == 0x40 && reg1 >= NV_PRAMDAC_VPLL_COEFF) {
                uint32_t ramdac580 = NVReadRAMDAC(dev, 0, NV_PRAMDAC_580);

                /* check whether vpll has been forced into single stage mode */
                if (reg1 == NV_PRAMDAC_VPLL_COEFF) {
                        if (ramdac580 & NV_RAMDAC_580_VPLL1_ACTIVE)
                                pll2 = 0;
                } else
                        if (ramdac580 & NV_RAMDAC_580_VPLL2_ACTIVE)
                                pll2 = 0;
        }

        nouveau_hw_decode_pll(dev, reg1, pll1, pll2, pllvals);
        pllvals->refclk = pll_lim.refclk;
        return 0;
}

int
nouveau_hw_pllvals_to_clk(struct nouveau_pll_vals *pv)
{
        /* Avoid divide by zero if called at an inappropriate time */
        if (!pv->M1 || !pv->M2)
                return 0;

        return pv->N1 * pv->N2 * pv->refclk / (pv->M1 * pv->M2) >> pv->log2P;
}

int
nouveau_hw_get_clock(struct drm_device *dev, enum nvbios_pll_type plltype)
{
        struct nouveau_pll_vals pllvals;
        int ret;

        if (plltype == PLL_MEMORY &&
            (dev->pci_device & 0x0ff0) == CHIPSET_NFORCE) {
                uint32_t mpllP;

                pci_read_config_dword(pci_get_bus_and_slot(0, 3), 0x6c, &mpllP);
                if (!mpllP)
                        mpllP = 4;

                return 400000 / mpllP;
        } else
        if (plltype == PLL_MEMORY &&
            (dev->pci_device & 0xff0) == CHIPSET_NFORCE2) {
                uint32_t clock;

                pci_read_config_dword(pci_get_bus_and_slot(0, 5), 0x4c, &clock);
                return clock;
        }

        ret = nouveau_hw_get_pllvals(dev, plltype, &pllvals);
        if (ret)
                return ret;

        return nouveau_hw_pllvals_to_clk(&pllvals);
}

static void
nouveau_hw_fix_bad_vpll(struct drm_device *dev, int head)
{
        /* the vpll on an unused head can come up with a random value, way
         * beyond the pll limits.  for some reason this causes the chip to
         * lock up when reading the dac palette regs, so set a valid pll here
         * when such a condition detected.  only seen on nv11 to date
         */

        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_device *device = nv_device(drm->device);
        struct nouveau_clock *clk = nouveau_clock(device);
        struct nouveau_bios *bios = nouveau_bios(device);
        struct nvbios_pll pll_lim;
        struct nouveau_pll_vals pv;
        enum nvbios_pll_type pll = head ? PLL_VPLL1 : PLL_VPLL0;

        if (nvbios_pll_parse(bios, pll, &pll_lim))
                return;
        nouveau_hw_get_pllvals(dev, pll, &pv);

        if (pv.M1 >= pll_lim.vco1.min_m && pv.M1 <= pll_lim.vco1.max_m &&
            pv.N1 >= pll_lim.vco1.min_n && pv.N1 <= pll_lim.vco1.max_n &&
            pv.log2P <= pll_lim.max_p)
                return;

        NV_WARN(drm, "VPLL %d outwith limits, attempting to fix\n", head + 1);

        /* set lowest clock within static limits */
        pv.M1 = pll_lim.vco1.max_m;
        pv.N1 = pll_lim.vco1.min_n;
        pv.log2P = pll_lim.max_p_usable;
        clk->pll_prog(clk, pll_lim.reg, &pv);
}

/*
 * vga font save/restore
 */

static void nouveau_vga_font_io(struct drm_device *dev,
                                void __iomem *iovram,
                                bool save, unsigned plane)
{
        unsigned i;

        NVWriteVgaSeq(dev, 0, NV_VIO_SR_PLANE_MASK_INDEX, 1 << plane);
        NVWriteVgaGr(dev, 0, NV_VIO_GX_READ_MAP_INDEX, plane);
        for (i = 0; i < 16384; i++) {
                if (save) {
                        nv04_display(dev)->saved_vga_font[plane][i] =
                                        ioread32_native(iovram + i * 4);
                } else {
                        iowrite32_native(nv04_display(dev)->saved_vga_font[plane][i],
                                                        iovram + i * 4);
                }
        }
}

void
nouveau_hw_save_vga_fonts(struct drm_device *dev, bool save)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        uint8_t misc, gr4, gr5, gr6, seq2, seq4;
        bool graphicsmode;
        unsigned plane;
        void __iomem *iovram;

        if (nv_two_heads(dev))
                NVSetOwner(dev, 0);

        NVSetEnablePalette(dev, 0, true);
        graphicsmode = NVReadVgaAttr(dev, 0, NV_CIO_AR_MODE_INDEX) & 1;
        NVSetEnablePalette(dev, 0, false);

        if (graphicsmode) /* graphics mode => framebuffer => no need to save */
                return;

        NV_INFO(drm, "%sing VGA fonts\n", save ? "Sav" : "Restor");

        /* map first 64KiB of VRAM, holds VGA fonts etc */
        iovram = ioremap(pci_resource_start(dev->pdev, 1), 65536);
        if (!iovram) {
                NV_ERROR(drm, "Failed to map VRAM, "
                                        "cannot save/restore VGA fonts.\n");
                return;
        }

        if (nv_two_heads(dev))
                NVBlankScreen(dev, 1, true);
        NVBlankScreen(dev, 0, true);

        /* save control regs */
        misc = NVReadPRMVIO(dev, 0, NV_PRMVIO_MISC__READ);
        seq2 = NVReadVgaSeq(dev, 0, NV_VIO_SR_PLANE_MASK_INDEX);
        seq4 = NVReadVgaSeq(dev, 0, NV_VIO_SR_MEM_MODE_INDEX);
        gr4 = NVReadVgaGr(dev, 0, NV_VIO_GX_READ_MAP_INDEX);
        gr5 = NVReadVgaGr(dev, 0, NV_VIO_GX_MODE_INDEX);
        gr6 = NVReadVgaGr(dev, 0, NV_VIO_GX_MISC_INDEX);

        NVWritePRMVIO(dev, 0, NV_PRMVIO_MISC__WRITE, 0x67);
        NVWriteVgaSeq(dev, 0, NV_VIO_SR_MEM_MODE_INDEX, 0x6);
        NVWriteVgaGr(dev, 0, NV_VIO_GX_MODE_INDEX, 0x0);
        NVWriteVgaGr(dev, 0, NV_VIO_GX_MISC_INDEX, 0x5);

        /* store font in planes 0..3 */
        for (plane = 0; plane < 4; plane++)
                nouveau_vga_font_io(dev, iovram, save, plane);

        /* restore control regs */
        NVWritePRMVIO(dev, 0, NV_PRMVIO_MISC__WRITE, misc);
        NVWriteVgaGr(dev, 0, NV_VIO_GX_READ_MAP_INDEX, gr4);
        NVWriteVgaGr(dev, 0, NV_VIO_GX_MODE_INDEX, gr5);
        NVWriteVgaGr(dev, 0, NV_VIO_GX_MISC_INDEX, gr6);
        NVWriteVgaSeq(dev, 0, NV_VIO_SR_PLANE_MASK_INDEX, seq2);
        NVWriteVgaSeq(dev, 0, NV_VIO_SR_MEM_MODE_INDEX, seq4);

        if (nv_two_heads(dev))
                NVBlankScreen(dev, 1, false);
        NVBlankScreen(dev, 0, false);

        iounmap(iovram);
}

/*
 * mode state save/load
 */

static void
rd_cio_state(struct drm_device *dev, int head,
             struct nv04_crtc_reg *crtcstate, int index)
{
        crtcstate->CRTC[index] = NVReadVgaCrtc(dev, head, index);
}

static void
wr_cio_state(struct drm_device *dev, int head,
             struct nv04_crtc_reg *crtcstate, int index)
{
        NVWriteVgaCrtc(dev, head, index, crtcstate->CRTC[index]);
}

static void
nv_save_state_ramdac(struct drm_device *dev, int head,
                     struct nv04_mode_state *state)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nv04_crtc_reg *regp = &state->crtc_reg[head];
        int i;

        if (nv_device(drm->device)->card_type >= NV_10)
                regp->nv10_cursync = NVReadRAMDAC(dev, head, NV_RAMDAC_NV10_CURSYNC);

        nouveau_hw_get_pllvals(dev, head ? PLL_VPLL1 : PLL_VPLL0, &regp->pllvals);
        state->pllsel = NVReadRAMDAC(dev, 0, NV_PRAMDAC_PLL_COEFF_SELECT);
        if (nv_two_heads(dev))
                state->sel_clk = NVReadRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK);
        if (nv_device(drm->device)->chipset == 0x11)
                regp->dither = NVReadRAMDAC(dev, head, NV_RAMDAC_DITHER_NV11);

        regp->ramdac_gen_ctrl = NVReadRAMDAC(dev, head, NV_PRAMDAC_GENERAL_CONTROL);

        if (nv_gf4_disp_arch(dev))
                regp->ramdac_630 = NVReadRAMDAC(dev, head, NV_PRAMDAC_630);
        if (nv_device(drm->device)->chipset >= 0x30)
                regp->ramdac_634 = NVReadRAMDAC(dev, head, NV_PRAMDAC_634);

        regp->tv_setup = NVReadRAMDAC(dev, head, NV_PRAMDAC_TV_SETUP);
        regp->tv_vtotal = NVReadRAMDAC(dev, head, NV_PRAMDAC_TV_VTOTAL);
        regp->tv_vskew = NVReadRAMDAC(dev, head, NV_PRAMDAC_TV_VSKEW);
        regp->tv_vsync_delay = NVReadRAMDAC(dev, head, NV_PRAMDAC_TV_VSYNC_DELAY);
        regp->tv_htotal = NVReadRAMDAC(dev, head, NV_PRAMDAC_TV_HTOTAL);
        regp->tv_hskew = NVReadRAMDAC(dev, head, NV_PRAMDAC_TV_HSKEW);
        regp->tv_hsync_delay = NVReadRAMDAC(dev, head, NV_PRAMDAC_TV_HSYNC_DELAY);
        regp->tv_hsync_delay2 = NVReadRAMDAC(dev, head, NV_PRAMDAC_TV_HSYNC_DELAY2);

        for (i = 0; i < 7; i++) {
                uint32_t ramdac_reg = NV_PRAMDAC_FP_VDISPLAY_END + (i * 4);
                regp->fp_vert_regs[i] = NVReadRAMDAC(dev, head, ramdac_reg);
                regp->fp_horiz_regs[i] = NVReadRAMDAC(dev, head, ramdac_reg + 0x20);
        }

        if (nv_gf4_disp_arch(dev)) {
                regp->dither = NVReadRAMDAC(dev, head, NV_RAMDAC_FP_DITHER);
                for (i = 0; i < 3; i++) {
                        regp->dither_regs[i] = NVReadRAMDAC(dev, head, NV_PRAMDAC_850 + i * 4);
                        regp->dither_regs[i + 3] = NVReadRAMDAC(dev, head, NV_PRAMDAC_85C + i * 4);
                }
        }

        regp->fp_control = NVReadRAMDAC(dev, head, NV_PRAMDAC_FP_TG_CONTROL);
        regp->fp_debug_0 = NVReadRAMDAC(dev, head, NV_PRAMDAC_FP_DEBUG_0);
        if (!nv_gf4_disp_arch(dev) && head == 0) {
                /* early chips don't allow access to PRAMDAC_TMDS_* without
                 * the head A FPCLK on (nv11 even locks up) */
                NVWriteRAMDAC(dev, 0, NV_PRAMDAC_FP_DEBUG_0, regp->fp_debug_0 &
                              ~NV_PRAMDAC_FP_DEBUG_0_PWRDOWN_FPCLK);
        }
        regp->fp_debug_1 = NVReadRAMDAC(dev, head, NV_PRAMDAC_FP_DEBUG_1);
        regp->fp_debug_2 = NVReadRAMDAC(dev, head, NV_PRAMDAC_FP_DEBUG_2);

        regp->fp_margin_color = NVReadRAMDAC(dev, head, NV_PRAMDAC_FP_MARGIN_COLOR);

        if (nv_gf4_disp_arch(dev))
                regp->ramdac_8c0 = NVReadRAMDAC(dev, head, NV_PRAMDAC_8C0);

        if (nv_device(drm->device)->card_type == NV_40) {
                regp->ramdac_a20 = NVReadRAMDAC(dev, head, NV_PRAMDAC_A20);
                regp->ramdac_a24 = NVReadRAMDAC(dev, head, NV_PRAMDAC_A24);
                regp->ramdac_a34 = NVReadRAMDAC(dev, head, NV_PRAMDAC_A34);

                for (i = 0; i < 38; i++)
                        regp->ctv_regs[i] = NVReadRAMDAC(dev, head,
                                                         NV_PRAMDAC_CTV + 4*i);
        }
}

static void
nv_load_state_ramdac(struct drm_device *dev, int head,
                     struct nv04_mode_state *state)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_clock *clk = nouveau_clock(drm->device);
        struct nv04_crtc_reg *regp = &state->crtc_reg[head];
        uint32_t pllreg = head ? NV_RAMDAC_VPLL2 : NV_PRAMDAC_VPLL_COEFF;
        int i;

        if (nv_device(drm->device)->card_type >= NV_10)
                NVWriteRAMDAC(dev, head, NV_RAMDAC_NV10_CURSYNC, regp->nv10_cursync);

        clk->pll_prog(clk, pllreg, &regp->pllvals);
        NVWriteRAMDAC(dev, 0, NV_PRAMDAC_PLL_COEFF_SELECT, state->pllsel);
        if (nv_two_heads(dev))
                NVWriteRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK, state->sel_clk);
        if (nv_device(drm->device)->chipset == 0x11)
                NVWriteRAMDAC(dev, head, NV_RAMDAC_DITHER_NV11, regp->dither);

        NVWriteRAMDAC(dev, head, NV_PRAMDAC_GENERAL_CONTROL, regp->ramdac_gen_ctrl);

        if (nv_gf4_disp_arch(dev))
                NVWriteRAMDAC(dev, head, NV_PRAMDAC_630, regp->ramdac_630);
        if (nv_device(drm->device)->chipset >= 0x30)
                NVWriteRAMDAC(dev, head, NV_PRAMDAC_634, regp->ramdac_634);

        NVWriteRAMDAC(dev, head, NV_PRAMDAC_TV_SETUP, regp->tv_setup);
        NVWriteRAMDAC(dev, head, NV_PRAMDAC_TV_VTOTAL, regp->tv_vtotal);
        NVWriteRAMDAC(dev, head, NV_PRAMDAC_TV_VSKEW, regp->tv_vskew);
        NVWriteRAMDAC(dev, head, NV_PRAMDAC_TV_VSYNC_DELAY, regp->tv_vsync_delay);
        NVWriteRAMDAC(dev, head, NV_PRAMDAC_TV_HTOTAL, regp->tv_htotal);
        NVWriteRAMDAC(dev, head, NV_PRAMDAC_TV_HSKEW, regp->tv_hskew);
        NVWriteRAMDAC(dev, head, NV_PRAMDAC_TV_HSYNC_DELAY, regp->tv_hsync_delay);
        NVWriteRAMDAC(dev, head, NV_PRAMDAC_TV_HSYNC_DELAY2, regp->tv_hsync_delay2);

        for (i = 0; i < 7; i++) {
                uint32_t ramdac_reg = NV_PRAMDAC_FP_VDISPLAY_END + (i * 4);

                NVWriteRAMDAC(dev, head, ramdac_reg, regp->fp_vert_regs[i]);
                NVWriteRAMDAC(dev, head, ramdac_reg + 0x20, regp->fp_horiz_regs[i]);
        }

        if (nv_gf4_disp_arch(dev)) {
                NVWriteRAMDAC(dev, head, NV_RAMDAC_FP_DITHER, regp->dither);
                for (i = 0; i < 3; i++) {
                        NVWriteRAMDAC(dev, head, NV_PRAMDAC_850 + i * 4, regp->dither_regs[i]);
                        NVWriteRAMDAC(dev, head, NV_PRAMDAC_85C + i * 4, regp->dither_regs[i + 3]);
                }
        }

        NVWriteRAMDAC(dev, head, NV_PRAMDAC_FP_TG_CONTROL, regp->fp_control);
        NVWriteRAMDAC(dev, head, NV_PRAMDAC_FP_DEBUG_0, regp->fp_debug_0);
        NVWriteRAMDAC(dev, head, NV_PRAMDAC_FP_DEBUG_1, regp->fp_debug_1);
        NVWriteRAMDAC(dev, head, NV_PRAMDAC_FP_DEBUG_2, regp->fp_debug_2);

        NVWriteRAMDAC(dev, head, NV_PRAMDAC_FP_MARGIN_COLOR, regp->fp_margin_color);

        if (nv_gf4_disp_arch(dev))
                NVWriteRAMDAC(dev, head, NV_PRAMDAC_8C0, regp->ramdac_8c0);

        if (nv_device(drm->device)->card_type == NV_40) {
                NVWriteRAMDAC(dev, head, NV_PRAMDAC_A20, regp->ramdac_a20);
                NVWriteRAMDAC(dev, head, NV_PRAMDAC_A24, regp->ramdac_a24);
                NVWriteRAMDAC(dev, head, NV_PRAMDAC_A34, regp->ramdac_a34);

                for (i = 0; i < 38; i++)
                        NVWriteRAMDAC(dev, head,
                                      NV_PRAMDAC_CTV + 4*i, regp->ctv_regs[i]);
        }
}

static void
nv_save_state_vga(struct drm_device *dev, int head,
                  struct nv04_mode_state *state)
{
        struct nv04_crtc_reg *regp = &state->crtc_reg[head];
        int i;

        regp->MiscOutReg = NVReadPRMVIO(dev, head, NV_PRMVIO_MISC__READ);

        for (i = 0; i < 25; i++)
                rd_cio_state(dev, head, regp, i);

        NVSetEnablePalette(dev, head, true);
        for (i = 0; i < 21; i++)
                regp->Attribute[i] = NVReadVgaAttr(dev, head, i);
        NVSetEnablePalette(dev, head, false);

        for (i = 0; i < 9; i++)
                regp->Graphics[i] = NVReadVgaGr(dev, head, i);

        for (i = 0; i < 5; i++)
                regp->Sequencer[i] = NVReadVgaSeq(dev, head, i);
}

static void
nv_load_state_vga(struct drm_device *dev, int head,
                  struct nv04_mode_state *state)
{
        struct nv04_crtc_reg *regp = &state->crtc_reg[head];
        int i;

        NVWritePRMVIO(dev, head, NV_PRMVIO_MISC__WRITE, regp->MiscOutReg);

        for (i = 0; i < 5; i++)
                NVWriteVgaSeq(dev, head, i, regp->Sequencer[i]);

        nv_lock_vga_crtc_base(dev, head, false);
        for (i = 0; i < 25; i++)
                wr_cio_state(dev, head, regp, i);
        nv_lock_vga_crtc_base(dev, head, true);

        for (i = 0; i < 9; i++)
                NVWriteVgaGr(dev, head, i, regp->Graphics[i]);

        NVSetEnablePalette(dev, head, true);
        for (i = 0; i < 21; i++)
                NVWriteVgaAttr(dev, head, i, regp->Attribute[i]);
        NVSetEnablePalette(dev, head, false);
}

static void
nv_save_state_ext(struct drm_device *dev, int head,
                  struct nv04_mode_state *state)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nv04_crtc_reg *regp = &state->crtc_reg[head];
        int i;

        rd_cio_state(dev, head, regp, NV_CIO_CRE_LCD__INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_RPC0_INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_RPC1_INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_LSR_INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_PIXEL_INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_HEB__INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_ENH_INDEX);

        rd_cio_state(dev, head, regp, NV_CIO_CRE_FF_INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_FFLWM__INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_21);

        if (nv_device(drm->device)->card_type >= NV_20)
                rd_cio_state(dev, head, regp, NV_CIO_CRE_47);

        if (nv_device(drm->device)->card_type >= NV_30)
                rd_cio_state(dev, head, regp, 0x9f);

        rd_cio_state(dev, head, regp, NV_CIO_CRE_49);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_HCUR_ADDR0_INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_HCUR_ADDR1_INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_HCUR_ADDR2_INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_ILACE__INDEX);

        if (nv_device(drm->device)->card_type >= NV_10) {
                regp->crtc_830 = NVReadCRTC(dev, head, NV_PCRTC_830);
                regp->crtc_834 = NVReadCRTC(dev, head, NV_PCRTC_834);

                if (nv_device(drm->device)->card_type >= NV_30)
                        regp->gpio_ext = NVReadCRTC(dev, head, NV_PCRTC_GPIO_EXT);

                if (nv_device(drm->device)->card_type == NV_40)
                        regp->crtc_850 = NVReadCRTC(dev, head, NV_PCRTC_850);

                if (nv_two_heads(dev))
                        regp->crtc_eng_ctrl = NVReadCRTC(dev, head, NV_PCRTC_ENGINE_CTRL);
                regp->cursor_cfg = NVReadCRTC(dev, head, NV_PCRTC_CURSOR_CONFIG);
        }

        regp->crtc_cfg = NVReadCRTC(dev, head, NV_PCRTC_CONFIG);

        rd_cio_state(dev, head, regp, NV_CIO_CRE_SCRATCH3__INDEX);
        rd_cio_state(dev, head, regp, NV_CIO_CRE_SCRATCH4__INDEX);
        if (nv_device(drm->device)->card_type >= NV_10) {
                rd_cio_state(dev, head, regp, NV_CIO_CRE_EBR_INDEX);
                rd_cio_state(dev, head, regp, NV_CIO_CRE_CSB);
                rd_cio_state(dev, head, regp, NV_CIO_CRE_4B);
                rd_cio_state(dev, head, regp, NV_CIO_CRE_TVOUT_LATENCY);
        }
        /* NV11 and NV20 don't have this, they stop at 0x52. */
        if (nv_gf4_disp_arch(dev)) {
                rd_cio_state(dev, head, regp, NV_CIO_CRE_42);
                rd_cio_state(dev, head, regp, NV_CIO_CRE_53);
                rd_cio_state(dev, head, regp, NV_CIO_CRE_54);

                for (i = 0; i < 0x10; i++)
                        regp->CR58[i] = NVReadVgaCrtc5758(dev, head, i);
                rd_cio_state(dev, head, regp, NV_CIO_CRE_59);
                rd_cio_state(dev, head, regp, NV_CIO_CRE_5B);

                rd_cio_state(dev, head, regp, NV_CIO_CRE_85);
                rd_cio_state(dev, head, regp, NV_CIO_CRE_86);
        }

        regp->fb_start = NVReadCRTC(dev, head, NV_PCRTC_START);
}

static void
nv_load_state_ext(struct drm_device *dev, int head,
                  struct nv04_mode_state *state)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_device *device = nv_device(drm->device);
        struct nouveau_timer *ptimer = nouveau_timer(device);
        struct nv04_crtc_reg *regp = &state->crtc_reg[head];
        uint32_t reg900;
        int i;

        if (nv_device(drm->device)->card_type >= NV_10) {
                if (nv_two_heads(dev))
                        /* setting ENGINE_CTRL (EC) *must* come before
                         * CIO_CRE_LCD, as writing CRE_LCD sets bits 16 & 17 in
                         * EC that should not be overwritten by writing stale EC
                         */
                        NVWriteCRTC(dev, head, NV_PCRTC_ENGINE_CTRL, regp->crtc_eng_ctrl);

                nv_wr32(device, NV_PVIDEO_STOP, 1);
                nv_wr32(device, NV_PVIDEO_INTR_EN, 0);
                nv_wr32(device, NV_PVIDEO_OFFSET_BUFF(0), 0);
                nv_wr32(device, NV_PVIDEO_OFFSET_BUFF(1), 0);
                nv_wr32(device, NV_PVIDEO_LIMIT(0), 0); //drm->fb_available_size - 1);
                nv_wr32(device, NV_PVIDEO_LIMIT(1), 0); //drm->fb_available_size - 1);
                nv_wr32(device, NV_PVIDEO_UVPLANE_LIMIT(0), 0); //drm->fb_available_size - 1);
                nv_wr32(device, NV_PVIDEO_UVPLANE_LIMIT(1), 0); //drm->fb_available_size - 1);
                nv_wr32(device, NV_PBUS_POWERCTRL_2, 0);

                NVWriteCRTC(dev, head, NV_PCRTC_CURSOR_CONFIG, regp->cursor_cfg);
                NVWriteCRTC(dev, head, NV_PCRTC_830, regp->crtc_830);
                NVWriteCRTC(dev, head, NV_PCRTC_834, regp->crtc_834);

                if (nv_device(drm->device)->card_type >= NV_30)
                        NVWriteCRTC(dev, head, NV_PCRTC_GPIO_EXT, regp->gpio_ext);

                if (nv_device(drm->device)->card_type == NV_40) {
                        NVWriteCRTC(dev, head, NV_PCRTC_850, regp->crtc_850);

                        reg900 = NVReadRAMDAC(dev, head, NV_PRAMDAC_900);
                        if (regp->crtc_cfg == NV10_PCRTC_CONFIG_START_ADDRESS_HSYNC)
                                NVWriteRAMDAC(dev, head, NV_PRAMDAC_900, reg900 | 0x10000);
                        else
                                NVWriteRAMDAC(dev, head, NV_PRAMDAC_900, reg900 & ~0x10000);
                }
        }

        NVWriteCRTC(dev, head, NV_PCRTC_CONFIG, regp->crtc_cfg);

        wr_cio_state(dev, head, regp, NV_CIO_CRE_RPC0_INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_RPC1_INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_LSR_INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_PIXEL_INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_LCD__INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_HEB__INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_ENH_INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_FF_INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_FFLWM__INDEX);

        if (nv_device(drm->device)->card_type >= NV_20)
                wr_cio_state(dev, head, regp, NV_CIO_CRE_47);

        if (nv_device(drm->device)->card_type >= NV_30)
                wr_cio_state(dev, head, regp, 0x9f);

        wr_cio_state(dev, head, regp, NV_CIO_CRE_49);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_HCUR_ADDR0_INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_HCUR_ADDR1_INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_HCUR_ADDR2_INDEX);
        if (nv_device(drm->device)->card_type == NV_40)
                nv_fix_nv40_hw_cursor(dev, head);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_ILACE__INDEX);

        wr_cio_state(dev, head, regp, NV_CIO_CRE_SCRATCH3__INDEX);
        wr_cio_state(dev, head, regp, NV_CIO_CRE_SCRATCH4__INDEX);
        if (nv_device(drm->device)->card_type >= NV_10) {
                wr_cio_state(dev, head, regp, NV_CIO_CRE_EBR_INDEX);
                wr_cio_state(dev, head, regp, NV_CIO_CRE_CSB);
                wr_cio_state(dev, head, regp, NV_CIO_CRE_4B);
                wr_cio_state(dev, head, regp, NV_CIO_CRE_TVOUT_LATENCY);
        }
        /* NV11 and NV20 stop at 0x52. */
        if (nv_gf4_disp_arch(dev)) {
                if (nv_device(drm->device)->card_type == NV_10) {
                        /* Not waiting for vertical retrace before modifying
                           CRE_53/CRE_54 causes lockups. */
                        nouveau_timer_wait_eq(ptimer, 650000000, NV_PRMCIO_INP0__COLOR, 0x8, 0x8);
                        nouveau_timer_wait_eq(ptimer, 650000000, NV_PRMCIO_INP0__COLOR, 0x8, 0x0);
                }

                wr_cio_state(dev, head, regp, NV_CIO_CRE_42);
                wr_cio_state(dev, head, regp, NV_CIO_CRE_53);
                wr_cio_state(dev, head, regp, NV_CIO_CRE_54);

                for (i = 0; i < 0x10; i++)
                        NVWriteVgaCrtc5758(dev, head, i, regp->CR58[i]);
                wr_cio_state(dev, head, regp, NV_CIO_CRE_59);
                wr_cio_state(dev, head, regp, NV_CIO_CRE_5B);

                wr_cio_state(dev, head, regp, NV_CIO_CRE_85);
                wr_cio_state(dev, head, regp, NV_CIO_CRE_86);
        }

        NVWriteCRTC(dev, head, NV_PCRTC_START, regp->fb_start);
}

static void
nv_save_state_palette(struct drm_device *dev, int head,
                      struct nv04_mode_state *state)
{
        struct nouveau_device *device = nouveau_dev(dev);
        int head_offset = head * NV_PRMDIO_SIZE, i;

        nv_wr08(device, NV_PRMDIO_PIXEL_MASK + head_offset,
                                NV_PRMDIO_PIXEL_MASK_MASK);
        nv_wr08(device, NV_PRMDIO_READ_MODE_ADDRESS + head_offset, 0x0);

        for (i = 0; i < 768; i++) {
                state->crtc_reg[head].DAC[i] = nv_rd08(device,
                                NV_PRMDIO_PALETTE_DATA + head_offset);
        }

        NVSetEnablePalette(dev, head, false);
}

void
nouveau_hw_load_state_palette(struct drm_device *dev, int head,
                              struct nv04_mode_state *state)
{
        struct nouveau_device *device = nouveau_dev(dev);
        int head_offset = head * NV_PRMDIO_SIZE, i;

        nv_wr08(device, NV_PRMDIO_PIXEL_MASK + head_offset,
                                NV_PRMDIO_PIXEL_MASK_MASK);
        nv_wr08(device, NV_PRMDIO_WRITE_MODE_ADDRESS + head_offset, 0x0);

        for (i = 0; i < 768; i++) {
                nv_wr08(device, NV_PRMDIO_PALETTE_DATA + head_offset,
                                state->crtc_reg[head].DAC[i]);
        }

        NVSetEnablePalette(dev, head, false);
}

void nouveau_hw_save_state(struct drm_device *dev, int head,
                           struct nv04_mode_state *state)
{
        struct nouveau_drm *drm = nouveau_drm(dev);

        if (nv_device(drm->device)->chipset == 0x11)
                /* NB: no attempt is made to restore the bad pll later on */
                nouveau_hw_fix_bad_vpll(dev, head);
        nv_save_state_ramdac(dev, head, state);
        nv_save_state_vga(dev, head, state);
        nv_save_state_palette(dev, head, state);
        nv_save_state_ext(dev, head, state);
}

void nouveau_hw_load_state(struct drm_device *dev, int head,
                           struct nv04_mode_state *state)
{
        NVVgaProtect(dev, head, true);
        nv_load_state_ramdac(dev, head, state);
        nv_load_state_ext(dev, head, state);
        nouveau_hw_load_state_palette(dev, head, state);
        nv_load_state_vga(dev, head, state);
        NVVgaProtect(dev, head, false);
}