/*
 * Copyright © 2006-2011 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Authors:
 *      Eric Anholt <eric@anholt.net>
 */

#include <linux/i2c.h>

#include <drm/drmP.h>
#include <drm/drm_plane_helper.h>
#include "framebuffer.h"
#include "psb_drv.h"
#include "psb_intel_drv.h"
#include "psb_intel_reg.h"
#include "gma_display.h"
#include "power.h"

#define INTEL_LIMIT_I9XX_SDVO_DAC   0
#define INTEL_LIMIT_I9XX_LVDS       1

static const struct gma_limit_t psb_intel_limits[] = {
        {                       /* INTEL_LIMIT_I9XX_SDVO_DAC */
         .dot = {.min = 20000, .max = 400000},
         .vco = {.min = 1400000, .max = 2800000},
         .n = {.min = 1, .max = 6},
         .m = {.min = 70, .max = 120},
         .m1 = {.min = 8, .max = 18},
         .m2 = {.min = 3, .max = 7},
         .p = {.min = 5, .max = 80},
         .p1 = {.min = 1, .max = 8},
         .p2 = {.dot_limit = 200000, .p2_slow = 10, .p2_fast = 5},
         .find_pll = gma_find_best_pll,
         },
        {                       /* INTEL_LIMIT_I9XX_LVDS */
         .dot = {.min = 20000, .max = 400000},
         .vco = {.min = 1400000, .max = 2800000},
         .n = {.min = 1, .max = 6},
         .m = {.min = 70, .max = 120},
         .m1 = {.min = 8, .max = 18},
         .m2 = {.min = 3, .max = 7},
         .p = {.min = 7, .max = 98},
         .p1 = {.min = 1, .max = 8},
         /* The single-channel range is 25-112Mhz, and dual-channel
          * is 80-224Mhz.  Prefer single channel as much as possible.
          */
         .p2 = {.dot_limit = 112000, .p2_slow = 14, .p2_fast = 7},
         .find_pll = gma_find_best_pll,
         },
};

static const struct gma_limit_t *psb_intel_limit(struct drm_crtc *crtc,
                                                 int refclk)
{
        const struct gma_limit_t *limit;

        if (gma_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
                limit = &psb_intel_limits[INTEL_LIMIT_I9XX_LVDS];
        else
                limit = &psb_intel_limits[INTEL_LIMIT_I9XX_SDVO_DAC];
        return limit;
}

static void psb_intel_clock(int refclk, struct gma_clock_t *clock)
{
        clock->m = 5 * (clock->m1 + 2) + (clock->m2 + 2);
        clock->p = clock->p1 * clock->p2;
        clock->vco = refclk * clock->m / (clock->n + 2);
        clock->dot = clock->vco / clock->p;
}

/**
 * Return the pipe currently connected to the panel fitter,
 * or -1 if the panel fitter is not present or not in use
 */
static int psb_intel_panel_fitter_pipe(struct drm_device *dev)
{
        u32 pfit_control;

        pfit_control = REG_READ(PFIT_CONTROL);

        /* See if the panel fitter is in use */
        if ((pfit_control & PFIT_ENABLE) == 0)
                return -1;
        /* Must be on PIPE 1 for PSB */
        return 1;
}

static int psb_intel_crtc_mode_set(struct drm_crtc *crtc,
                               struct drm_display_mode *mode,
                               struct drm_display_mode *adjusted_mode,
                               int x, int y,
                               struct drm_framebuffer *old_fb)
{
        struct drm_device *dev = crtc->dev;
        struct drm_psb_private *dev_priv = dev->dev_private;
        struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
        int pipe = gma_crtc->pipe;
        const struct psb_offset *map = &dev_priv->regmap[pipe];
        int refclk;
        struct gma_clock_t clock;
        u32 dpll = 0, fp = 0, dspcntr, pipeconf;
        bool ok, is_sdvo = false;
        bool is_lvds = false, is_tv = false;
        struct drm_mode_config *mode_config = &dev->mode_config;
        struct drm_connector *connector;
        const struct gma_limit_t *limit;

        /* No scan out no play */
        if (crtc->primary->fb == NULL) {
                crtc_funcs->mode_set_base(crtc, x, y, old_fb);
                return 0;
        }

        list_for_each_entry(connector, &mode_config->connector_list, head) {
                struct gma_encoder *gma_encoder = gma_attached_encoder(connector);

                if (!connector->encoder
                    || connector->encoder->crtc != crtc)
                        continue;

                switch (gma_encoder->type) {
                case INTEL_OUTPUT_LVDS:
                        is_lvds = true;
                        break;
                case INTEL_OUTPUT_SDVO:
                        is_sdvo = true;
                        break;
                case INTEL_OUTPUT_TVOUT:
                        is_tv = true;
                        break;
                }
        }

        refclk = 96000;

        limit = gma_crtc->clock_funcs->limit(crtc, refclk);

        ok = limit->find_pll(limit, crtc, adjusted_mode->clock, refclk,
                                 &clock);
        if (!ok) {
                DRM_ERROR("Couldn't find PLL settings for mode! target: %d, actual: %d",
                          adjusted_mode->clock, clock.dot);
                return 0;
        }

        fp = clock.n << 16 | clock.m1 << 8 | clock.m2;

        dpll = DPLL_VGA_MODE_DIS;
        if (is_lvds) {
                dpll |= DPLLB_MODE_LVDS;
                dpll |= DPLL_DVO_HIGH_SPEED;
        } else
                dpll |= DPLLB_MODE_DAC_SERIAL;
        if (is_sdvo) {
                int sdvo_pixel_multiply =
                            adjusted_mode->clock / mode->clock;
                dpll |= DPLL_DVO_HIGH_SPEED;
                dpll |=
                    (sdvo_pixel_multiply - 1) << SDVO_MULTIPLIER_SHIFT_HIRES;
        }

        /* compute bitmask from p1 value */
        dpll |= (1 << (clock.p1 - 1)) << 16;
        switch (clock.p2) {
        case 5:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
                break;
        case 7:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
                break;
        case 10:
                dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
                break;
        case 14:
                dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
                break;
        }

        if (is_tv) {
                /* XXX: just matching BIOS for now */
/*      dpll |= PLL_REF_INPUT_TVCLKINBC; */
                dpll |= 3;
        }
        dpll |= PLL_REF_INPUT_DREFCLK;

        /* setup pipeconf */
        pipeconf = REG_READ(map->conf);

        /* Set up the display plane register */
        dspcntr = DISPPLANE_GAMMA_ENABLE;

        if (pipe == 0)
                dspcntr |= DISPPLANE_SEL_PIPE_A;
        else
                dspcntr |= DISPPLANE_SEL_PIPE_B;

        dspcntr |= DISPLAY_PLANE_ENABLE;
        pipeconf |= PIPEACONF_ENABLE;
        dpll |= DPLL_VCO_ENABLE;


        /* Disable the panel fitter if it was on our pipe */
        if (psb_intel_panel_fitter_pipe(dev) == pipe)
                REG_WRITE(PFIT_CONTROL, 0);

        drm_mode_debug_printmodeline(mode);

        if (dpll & DPLL_VCO_ENABLE) {
                REG_WRITE(map->fp0, fp);
                REG_WRITE(map->dpll, dpll & ~DPLL_VCO_ENABLE);
                REG_READ(map->dpll);
                udelay(150);
        }

        /* The LVDS pin pair needs to be on before the DPLLs are enabled.
         * This is an exception to the general rule that mode_set doesn't turn
         * things on.
         */
        if (is_lvds) {
                u32 lvds = REG_READ(LVDS);

                lvds &= ~LVDS_PIPEB_SELECT;
                if (pipe == 1)
                        lvds |= LVDS_PIPEB_SELECT;

                lvds |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
                /* Set the B0-B3 data pairs corresponding to
                 * whether we're going to
                 * set the DPLLs for dual-channel mode or not.
                 */
                lvds &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
                if (clock.p2 == 7)
                        lvds |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;

                /* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
                 * appropriately here, but we need to look more
                 * thoroughly into how panels behave in the two modes.
                 */

                REG_WRITE(LVDS, lvds);
                REG_READ(LVDS);
        }

        REG_WRITE(map->fp0, fp);
        REG_WRITE(map->dpll, dpll);
        REG_READ(map->dpll);
        /* Wait for the clocks to stabilize. */
        udelay(150);

        /* write it again -- the BIOS does, after all */
        REG_WRITE(map->dpll, dpll);

        REG_READ(map->dpll);
        /* Wait for the clocks to stabilize. */
        udelay(150);

        REG_WRITE(map->htotal, (adjusted_mode->crtc_hdisplay - 1) |
                  ((adjusted_mode->crtc_htotal - 1) << 16));
        REG_WRITE(map->hblank, (adjusted_mode->crtc_hblank_start - 1) |
                  ((adjusted_mode->crtc_hblank_end - 1) << 16));
        REG_WRITE(map->hsync, (adjusted_mode->crtc_hsync_start - 1) |
                  ((adjusted_mode->crtc_hsync_end - 1) << 16));
        REG_WRITE(map->vtotal, (adjusted_mode->crtc_vdisplay - 1) |
                  ((adjusted_mode->crtc_vtotal - 1) << 16));
        REG_WRITE(map->vblank, (adjusted_mode->crtc_vblank_start - 1) |
                  ((adjusted_mode->crtc_vblank_end - 1) << 16));
        REG_WRITE(map->vsync, (adjusted_mode->crtc_vsync_start - 1) |
                  ((adjusted_mode->crtc_vsync_end - 1) << 16));
        /* pipesrc and dspsize control the size that is scaled from,
         * which should always be the user's requested size.
         */
        REG_WRITE(map->size,
                  ((mode->vdisplay - 1) << 16) | (mode->hdisplay - 1));
        REG_WRITE(map->pos, 0);
        REG_WRITE(map->src,
                  ((mode->hdisplay - 1) << 16) | (mode->vdisplay - 1));
        REG_WRITE(map->conf, pipeconf);
        REG_READ(map->conf);

        gma_wait_for_vblank(dev);

        REG_WRITE(map->cntr, dspcntr);

        /* Flush the plane changes */
        crtc_funcs->mode_set_base(crtc, x, y, old_fb);

        gma_wait_for_vblank(dev);

        return 0;
}

/* Returns the clock of the currently programmed mode of the given pipe. */
static int psb_intel_crtc_clock_get(struct drm_device *dev,
                                struct drm_crtc *crtc)
{
        struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
        struct drm_psb_private *dev_priv = dev->dev_private;
        int pipe = gma_crtc->pipe;
        const struct psb_offset *map = &dev_priv->regmap[pipe];
        u32 dpll;
        u32 fp;
        struct gma_clock_t clock;
        bool is_lvds;
        struct psb_pipe *p = &dev_priv->regs.pipe[pipe];

        if (gma_power_begin(dev, false)) {
                dpll = REG_READ(map->dpll);
                if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
                        fp = REG_READ(map->fp0);
                else
                        fp = REG_READ(map->fp1);
                is_lvds = (pipe == 1) && (REG_READ(LVDS) & LVDS_PORT_EN);
                gma_power_end(dev);
        } else {
                dpll = p->dpll;

                if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
                        fp = p->fp0;
                else
                        fp = p->fp1;

                is_lvds = (pipe == 1) && (dev_priv->regs.psb.saveLVDS &
                                                                LVDS_PORT_EN);
        }

        clock.m1 = (fp & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT;
        clock.m2 = (fp & FP_M2_DIV_MASK) >> FP_M2_DIV_SHIFT;
        clock.n = (fp & FP_N_DIV_MASK) >> FP_N_DIV_SHIFT;

        if (is_lvds) {
                clock.p1 =
                    ffs((dpll &
                         DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
                        DPLL_FPA01_P1_POST_DIV_SHIFT);
                clock.p2 = 14;

                if ((dpll & PLL_REF_INPUT_MASK) ==
                    PLLB_REF_INPUT_SPREADSPECTRUMIN) {
                        /* XXX: might not be 66MHz */
                        psb_intel_clock(66000, &clock);
                } else
                        psb_intel_clock(48000, &clock);
        } else {
                if (dpll & PLL_P1_DIVIDE_BY_TWO)
                        clock.p1 = 2;
                else {
                        clock.p1 =
                            ((dpll &
                              DPLL_FPA01_P1_POST_DIV_MASK_I830) >>
                             DPLL_FPA01_P1_POST_DIV_SHIFT) + 2;
                }
                if (dpll & PLL_P2_DIVIDE_BY_4)
                        clock.p2 = 4;
                else
                        clock.p2 = 2;

                psb_intel_clock(48000, &clock);
        }

        /* XXX: It would be nice to validate the clocks, but we can't reuse
         * i830PllIsValid() because it relies on the xf86_config connector
         * configuration being accurate, which it isn't necessarily.
         */

        return clock.dot;
}

/** Returns the currently programmed mode of the given pipe. */
struct drm_display_mode *psb_intel_crtc_mode_get(struct drm_device *dev,
                                             struct drm_crtc *crtc)
{
        struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
        int pipe = gma_crtc->pipe;
        struct drm_display_mode *mode;
        int htot;
        int hsync;
        int vtot;
        int vsync;
        struct drm_psb_private *dev_priv = dev->dev_private;
        struct psb_pipe *p = &dev_priv->regs.pipe[pipe];
        const struct psb_offset *map = &dev_priv->regmap[pipe];

        if (gma_power_begin(dev, false)) {
                htot = REG_READ(map->htotal);
                hsync = REG_READ(map->hsync);
                vtot = REG_READ(map->vtotal);
                vsync = REG_READ(map->vsync);
                gma_power_end(dev);
        } else {
                htot = p->htotal;
                hsync = p->hsync;
                vtot = p->vtotal;
                vsync = p->vsync;
        }

        mode = kzalloc(sizeof(*mode), GFP_KERNEL);
        if (!mode)
                return NULL;

        mode->clock = psb_intel_crtc_clock_get(dev, crtc);
        mode->hdisplay = (htot & 0xffff) + 1;
        mode->htotal = ((htot & 0xffff0000) >> 16) + 1;
        mode->hsync_start = (hsync & 0xffff) + 1;
        mode->hsync_end = ((hsync & 0xffff0000) >> 16) + 1;
        mode->vdisplay = (vtot & 0xffff) + 1;
        mode->vtotal = ((vtot & 0xffff0000) >> 16) + 1;
        mode->vsync_start = (vsync & 0xffff) + 1;
        mode->vsync_end = ((vsync & 0xffff0000) >> 16) + 1;

        drm_mode_set_name(mode);
        drm_mode_set_crtcinfo(mode, 0);

        return mode;
}

const struct drm_crtc_helper_funcs psb_intel_helper_funcs = {
        .dpms = gma_crtc_dpms,
        .mode_fixup = gma_crtc_mode_fixup,
        .mode_set = psb_intel_crtc_mode_set,
        .mode_set_base = gma_pipe_set_base,
        .prepare = gma_crtc_prepare,
        .commit = gma_crtc_commit,
        .disable = gma_crtc_disable,
};

const struct drm_crtc_funcs psb_intel_crtc_funcs = {
        .save = gma_crtc_save,
        .restore = gma_crtc_restore,
        .cursor_set = gma_crtc_cursor_set,
        .cursor_move = gma_crtc_cursor_move,
        .gamma_set = gma_crtc_gamma_set,
        .set_config = gma_crtc_set_config,
        .destroy = gma_crtc_destroy,
};

const struct gma_clock_funcs psb_clock_funcs = {
        .clock = psb_intel_clock,
        .limit = psb_intel_limit,
        .pll_is_valid = gma_pll_is_valid,
};

/*
 * Set the default value of cursor control and base register
 * to zero. This is a workaround for h/w defect on Oaktrail
 */
static void psb_intel_cursor_init(struct drm_device *dev,
                                  struct gma_crtc *gma_crtc)
{
        struct drm_psb_private *dev_priv = dev->dev_private;
        u32 control[3] = { CURACNTR, CURBCNTR, CURCCNTR };
        u32 base[3] = { CURABASE, CURBBASE, CURCBASE };
        struct gtt_range *cursor_gt;

        if (dev_priv->ops->cursor_needs_phys) {
                /* Allocate 4 pages of stolen mem for a hardware cursor. That
                 * is enough for the 64 x 64 ARGB cursors we support.
                 */
                cursor_gt = psb_gtt_alloc_range(dev, 4 * PAGE_SIZE, "cursor", 1,
                                                PAGE_SIZE);
                if (!cursor_gt) {
                        gma_crtc->cursor_gt = NULL;
                        goto out;
                }
                gma_crtc->cursor_gt = cursor_gt;
                gma_crtc->cursor_addr = dev_priv->stolen_base +
                                                        cursor_gt->offset;
        } else {
                gma_crtc->cursor_gt = NULL;
        }

out:
        REG_WRITE(control[gma_crtc->pipe], 0);
        REG_WRITE(base[gma_crtc->pipe], 0);
}

void psb_intel_crtc_init(struct drm_device *dev, int pipe,
                     struct psb_intel_mode_device *mode_dev)
{
        struct drm_psb_private *dev_priv = dev->dev_private;
        struct gma_crtc *gma_crtc;
        int i;
        uint16_t *r_base, *g_base, *b_base;

        /* We allocate a extra array of drm_connector pointers
         * for fbdev after the crtc */
        gma_crtc = kzalloc(sizeof(struct gma_crtc) +
                        (INTELFB_CONN_LIMIT * sizeof(struct drm_connector *)),
                        GFP_KERNEL);
        if (gma_crtc == NULL)
                return;

        gma_crtc->crtc_state =
                kzalloc(sizeof(struct psb_intel_crtc_state), GFP_KERNEL);
        if (!gma_crtc->crtc_state) {
                dev_err(dev->dev, "Crtc state error: No memory\n");
                kfree(gma_crtc);
                return;
        }

        /* Set the CRTC operations from the chip specific data */
        drm_crtc_init(dev, &gma_crtc->base, dev_priv->ops->crtc_funcs);

        /* Set the CRTC clock functions from chip specific data */
        gma_crtc->clock_funcs = dev_priv->ops->clock_funcs;

        drm_mode_crtc_set_gamma_size(&gma_crtc->base, 256);
        gma_crtc->pipe = pipe;
        gma_crtc->plane = pipe;

        r_base = gma_crtc->base.gamma_store;
        g_base = r_base + 256;
        b_base = g_base + 256;
        for (i = 0; i < 256; i++) {
                gma_crtc->lut_r[i] = i;
                gma_crtc->lut_g[i] = i;
                gma_crtc->lut_b[i] = i;
                r_base[i] = i << 8;
                g_base[i] = i << 8;
                b_base[i] = i << 8;

                gma_crtc->lut_adj[i] = 0;
        }

        gma_crtc->mode_dev = mode_dev;
        gma_crtc->cursor_addr = 0;

        drm_crtc_helper_add(&gma_crtc->base,
                                                dev_priv->ops->crtc_helper);

        /* Setup the array of drm_connector pointer array */
        gma_crtc->mode_set.crtc = &gma_crtc->base;
        BUG_ON(pipe >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
               dev_priv->plane_to_crtc_mapping[gma_crtc->plane] != NULL);
        dev_priv->plane_to_crtc_mapping[gma_crtc->plane] = &gma_crtc->base;
        dev_priv->pipe_to_crtc_mapping[gma_crtc->pipe] = &gma_crtc->base;
        gma_crtc->mode_set.connectors = (struct drm_connector **)(gma_crtc + 1);
        gma_crtc->mode_set.num_connectors = 0;
        psb_intel_cursor_init(dev, gma_crtc);

        /* Set to true so that the pipe is forced off on initial config. */
        gma_crtc->active = true;
}

struct drm_crtc *psb_intel_get_crtc_from_pipe(struct drm_device *dev, int pipe)
{
        struct drm_crtc *crtc = NULL;

        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
                if (gma_crtc->pipe == pipe)
                        break;
        }
        return crtc;
}

int gma_connector_clones(struct drm_device *dev, int type_mask)
{
        int index_mask = 0;
        struct drm_connector *connector;
        int entry = 0;

        list_for_each_entry(connector, &dev->mode_config.connector_list,
                            head) {
                struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
                if (type_mask & (1 << gma_encoder->type))
                        index_mask |= (1 << entry);
                entry++;
        }
        return index_mask;
}