/*
 * Copyright © 2006-2007 Intel Corporation
 *
 * 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 (including the next
 * paragraph) 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 OR COPYRIGHT HOLDERS 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:
 *      Eric Anholt <eric@anholt.net>
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/pm_runtime.h>

#include <drm/drm_simple_kms_helper.h>

#include "cdv_device.h"
#include "intel_bios.h"
#include "power.h"
#include "psb_drv.h"
#include "psb_intel_drv.h"
#include "psb_intel_reg.h"


static void cdv_intel_crt_dpms(struct drm_encoder *encoder, int mode)
{
        struct drm_device *dev = encoder->dev;
        u32 temp, reg;
        reg = ADPA;

        temp = REG_READ(reg);
        temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
        temp &= ~ADPA_DAC_ENABLE;

        switch (mode) {
        case DRM_MODE_DPMS_ON:
                temp |= ADPA_DAC_ENABLE;
                break;
        case DRM_MODE_DPMS_STANDBY:
                temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
                break;
        case DRM_MODE_DPMS_SUSPEND:
                temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
                break;
        case DRM_MODE_DPMS_OFF:
                temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
                break;
        }

        REG_WRITE(reg, temp);
}

static enum drm_mode_status cdv_intel_crt_mode_valid(struct drm_connector *connector,
                                struct drm_display_mode *mode)
{
        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
                return MODE_NO_DBLESCAN;

        /* The lowest clock for CDV is 20000KHz */
        if (mode->clock < 20000)
                return MODE_CLOCK_LOW;

        /* The max clock for CDV is 355 instead of 400 */
        if (mode->clock > 355000)
                return MODE_CLOCK_HIGH;

        return MODE_OK;
}

static void cdv_intel_crt_mode_set(struct drm_encoder *encoder,
                               struct drm_display_mode *mode,
                               struct drm_display_mode *adjusted_mode)
{

        struct drm_device *dev = encoder->dev;
        struct drm_crtc *crtc = encoder->crtc;
        struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
        int dpll_md_reg;
        u32 adpa, dpll_md;
        u32 adpa_reg;

        if (gma_crtc->pipe == 0)
                dpll_md_reg = DPLL_A_MD;
        else
                dpll_md_reg = DPLL_B_MD;

        adpa_reg = ADPA;

        /*
         * Disable separate mode multiplier used when cloning SDVO to CRT
         * XXX this needs to be adjusted when we really are cloning
         */
        {
                dpll_md = REG_READ(dpll_md_reg);
                REG_WRITE(dpll_md_reg,
                           dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
        }

        adpa = 0;
        if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
                adpa |= ADPA_HSYNC_ACTIVE_HIGH;
        if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
                adpa |= ADPA_VSYNC_ACTIVE_HIGH;

        if (gma_crtc->pipe == 0)
                adpa |= ADPA_PIPE_A_SELECT;
        else
                adpa |= ADPA_PIPE_B_SELECT;

        REG_WRITE(adpa_reg, adpa);
}


/*
 * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
 *
 * \return true if CRT is connected.
 * \return false if CRT is disconnected.
 */
static bool cdv_intel_crt_detect_hotplug(struct drm_connector *connector,
                                                                bool force)
{
        struct drm_device *dev = connector->dev;
        u32 hotplug_en;
        int i, tries = 0, ret = false;
        u32 orig;

        /*
         * On a CDV thep, CRT detect sequence need to be done twice
         * to get a reliable result.
         */
        tries = 2;

        orig = hotplug_en = REG_READ(PORT_HOTPLUG_EN);
        hotplug_en &= ~(CRT_HOTPLUG_DETECT_MASK);
        hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;

        hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
        hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;

        for (i = 0; i < tries ; i++) {
                unsigned long timeout;
                /* turn on the FORCE_DETECT */
                REG_WRITE(PORT_HOTPLUG_EN, hotplug_en);
                timeout = jiffies + msecs_to_jiffies(1000);
                /* wait for FORCE_DETECT to go off */
                do {
                        if (!(REG_READ(PORT_HOTPLUG_EN) &
                                        CRT_HOTPLUG_FORCE_DETECT))
                                break;
                        msleep(1);
                } while (time_after(timeout, jiffies));
        }

        if ((REG_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
            CRT_HOTPLUG_MONITOR_NONE)
                ret = true;

         /* clear the interrupt we just generated, if any */
        REG_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);

        /* and put the bits back */
        REG_WRITE(PORT_HOTPLUG_EN, orig);
        return ret;
}

static enum drm_connector_status cdv_intel_crt_detect(
                                struct drm_connector *connector, bool force)
{
        if (cdv_intel_crt_detect_hotplug(connector, force))
                return connector_status_connected;
        else
                return connector_status_disconnected;
}

static void cdv_intel_crt_destroy(struct drm_connector *connector)
{
        struct gma_encoder *gma_encoder = gma_attached_encoder(connector);

        psb_intel_i2c_destroy(gma_encoder->ddc_bus);
        drm_connector_unregister(connector);
        drm_connector_cleanup(connector);
        kfree(connector);
}

static int cdv_intel_crt_get_modes(struct drm_connector *connector)
{
        struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
        return psb_intel_ddc_get_modes(connector,
                                       &gma_encoder->ddc_bus->adapter);
}

static int cdv_intel_crt_set_property(struct drm_connector *connector,
                                  struct drm_property *property,
                                  uint64_t value)
{
        return 0;
}

/*
 * Routines for controlling stuff on the analog port
 */

static const struct drm_encoder_helper_funcs cdv_intel_crt_helper_funcs = {
        .dpms = cdv_intel_crt_dpms,
        .prepare = gma_encoder_prepare,
        .commit = gma_encoder_commit,
        .mode_set = cdv_intel_crt_mode_set,
};

static const struct drm_connector_funcs cdv_intel_crt_connector_funcs = {
        .dpms = drm_helper_connector_dpms,
        .detect = cdv_intel_crt_detect,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .destroy = cdv_intel_crt_destroy,
        .set_property = cdv_intel_crt_set_property,
};

static const struct drm_connector_helper_funcs
                                cdv_intel_crt_connector_helper_funcs = {
        .mode_valid = cdv_intel_crt_mode_valid,
        .get_modes = cdv_intel_crt_get_modes,
        .best_encoder = gma_best_encoder,
};

void cdv_intel_crt_init(struct drm_device *dev,
                        struct psb_intel_mode_device *mode_dev)
{

        struct gma_connector *gma_connector;
        struct gma_encoder *gma_encoder;
        struct drm_connector *connector;
        struct drm_encoder *encoder;

        gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
        if (!gma_encoder)
                return;

        gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
        if (!gma_connector)
                goto failed_connector;

        connector = &gma_connector->base;
        connector->polled = DRM_CONNECTOR_POLL_HPD;
        drm_connector_init(dev, connector,
                &cdv_intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);

        encoder = &gma_encoder->base;
        drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DAC);

        gma_connector_attach_encoder(gma_connector, gma_encoder);

        /* Set up the DDC bus. */
        gma_encoder->ddc_bus = psb_intel_i2c_create(dev, GPIOA, "CRTDDC_A");
        if (!gma_encoder->ddc_bus) {
                dev_printk(KERN_ERR, dev->dev, "DDC bus registration failed.\n");
                goto failed_ddc;
        }

        gma_encoder->type = INTEL_OUTPUT_ANALOG;
        connector->interlace_allowed = 0;
        connector->doublescan_allowed = 0;

        drm_encoder_helper_add(encoder, &cdv_intel_crt_helper_funcs);
        drm_connector_helper_add(connector,
                                        &cdv_intel_crt_connector_helper_funcs);

        drm_connector_register(connector);

        return;
failed_ddc:
        drm_encoder_cleanup(&gma_encoder->base);
        drm_connector_cleanup(&gma_connector->base);
        kfree(gma_connector);
failed_connector:
        kfree(gma_encoder);
        return;
}