/*
 * Copyright 2006 Dave Airlie <airlied@linux.ie>
 * 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/i2c.h>
#include <linux/slab.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/i915_drm.h>

#include "dvo.h"
#include "i915_drv.h"
#include "intel_connector.h"
#include "intel_drv.h"
#include "intel_dvo.h"
#include "intel_panel.h"

#define SIL164_ADDR     0x38
#define CH7xxx_ADDR     0x76
#define TFP410_ADDR     0x38
#define NS2501_ADDR     0x38

static const struct intel_dvo_device intel_dvo_devices[] = {
        {
                .type = INTEL_DVO_CHIP_TMDS,
                .name = "sil164",
                .dvo_reg = DVOC,
                .dvo_srcdim_reg = DVOC_SRCDIM,
                .slave_addr = SIL164_ADDR,
                .dev_ops = &sil164_ops,
        },
        {
                .type = INTEL_DVO_CHIP_TMDS,
                .name = "ch7xxx",
                .dvo_reg = DVOC,
                .dvo_srcdim_reg = DVOC_SRCDIM,
                .slave_addr = CH7xxx_ADDR,
                .dev_ops = &ch7xxx_ops,
        },
        {
                .type = INTEL_DVO_CHIP_TMDS,
                .name = "ch7xxx",
                .dvo_reg = DVOC,
                .dvo_srcdim_reg = DVOC_SRCDIM,
                .slave_addr = 0x75, /* For some ch7010 */
                .dev_ops = &ch7xxx_ops,
        },
        {
                .type = INTEL_DVO_CHIP_LVDS,
                .name = "ivch",
                .dvo_reg = DVOA,
                .dvo_srcdim_reg = DVOA_SRCDIM,
                .slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
                .dev_ops = &ivch_ops,
        },
        {
                .type = INTEL_DVO_CHIP_TMDS,
                .name = "tfp410",
                .dvo_reg = DVOC,
                .dvo_srcdim_reg = DVOC_SRCDIM,
                .slave_addr = TFP410_ADDR,
                .dev_ops = &tfp410_ops,
        },
        {
                .type = INTEL_DVO_CHIP_LVDS,
                .name = "ch7017",
                .dvo_reg = DVOC,
                .dvo_srcdim_reg = DVOC_SRCDIM,
                .slave_addr = 0x75,
                .gpio = GMBUS_PIN_DPB,
                .dev_ops = &ch7017_ops,
        },
        {
                .type = INTEL_DVO_CHIP_TMDS,
                .name = "ns2501",
                .dvo_reg = DVOB,
                .dvo_srcdim_reg = DVOB_SRCDIM,
                .slave_addr = NS2501_ADDR,
                .dev_ops = &ns2501_ops,
       }
};

struct intel_dvo {
        struct intel_encoder base;

        struct intel_dvo_device dev;

        struct intel_connector *attached_connector;

        bool panel_wants_dither;
};

static struct intel_dvo *enc_to_dvo(struct intel_encoder *encoder)
{
        return container_of(encoder, struct intel_dvo, base);
}

static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
{
        return enc_to_dvo(intel_attached_encoder(connector));
}

static bool intel_dvo_connector_get_hw_state(struct intel_connector *connector)
{
        struct drm_device *dev = connector->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_dvo *intel_dvo = intel_attached_dvo(&connector->base);
        u32 tmp;

        tmp = I915_READ(intel_dvo->dev.dvo_reg);

        if (!(tmp & DVO_ENABLE))
                return false;

        return intel_dvo->dev.dev_ops->get_hw_state(&intel_dvo->dev);
}

static bool intel_dvo_get_hw_state(struct intel_encoder *encoder,
                                   enum pipe *pipe)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
        u32 tmp;

        tmp = I915_READ(intel_dvo->dev.dvo_reg);

        *pipe = (tmp & DVO_PIPE_SEL_MASK) >> DVO_PIPE_SEL_SHIFT;

        return tmp & DVO_ENABLE;
}

static void intel_dvo_get_config(struct intel_encoder *encoder,
                                 struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
        u32 tmp, flags = 0;

        pipe_config->output_types |= BIT(INTEL_OUTPUT_DVO);

        tmp = I915_READ(intel_dvo->dev.dvo_reg);
        if (tmp & DVO_HSYNC_ACTIVE_HIGH)
                flags |= DRM_MODE_FLAG_PHSYNC;
        else
                flags |= DRM_MODE_FLAG_NHSYNC;
        if (tmp & DVO_VSYNC_ACTIVE_HIGH)
                flags |= DRM_MODE_FLAG_PVSYNC;
        else
                flags |= DRM_MODE_FLAG_NVSYNC;

        pipe_config->base.adjusted_mode.flags |= flags;

        pipe_config->base.adjusted_mode.crtc_clock = pipe_config->port_clock;
}

static void intel_disable_dvo(struct intel_encoder *encoder,
                              const struct intel_crtc_state *old_crtc_state,
                              const struct drm_connector_state *old_conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
        i915_reg_t dvo_reg = intel_dvo->dev.dvo_reg;
        u32 temp = I915_READ(dvo_reg);

        intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
        I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
        I915_READ(dvo_reg);
}

static void intel_enable_dvo(struct intel_encoder *encoder,
                             const struct intel_crtc_state *pipe_config,
                             const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
        i915_reg_t dvo_reg = intel_dvo->dev.dvo_reg;
        u32 temp = I915_READ(dvo_reg);

        intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev,
                                         &pipe_config->base.mode,
                                         &pipe_config->base.adjusted_mode);

        I915_WRITE(dvo_reg, temp | DVO_ENABLE);
        I915_READ(dvo_reg);

        intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
}

static enum drm_mode_status
intel_dvo_mode_valid(struct drm_connector *connector,
                     struct drm_display_mode *mode)
{
        struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
        const struct drm_display_mode *fixed_mode =
                to_intel_connector(connector)->panel.fixed_mode;
        int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
        int target_clock = mode->clock;

        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
                return MODE_NO_DBLESCAN;

        /* XXX: Validate clock range */

        if (fixed_mode) {
                if (mode->hdisplay > fixed_mode->hdisplay)
                        return MODE_PANEL;
                if (mode->vdisplay > fixed_mode->vdisplay)
                        return MODE_PANEL;

                target_clock = fixed_mode->clock;
        }

        if (target_clock > max_dotclk)
                return MODE_CLOCK_HIGH;

        return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
}

static int intel_dvo_compute_config(struct intel_encoder *encoder,
                                    struct intel_crtc_state *pipe_config,
                                    struct drm_connector_state *conn_state)
{
        struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
        const struct drm_display_mode *fixed_mode =
                intel_dvo->attached_connector->panel.fixed_mode;
        struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;

        /*
         * If we have timings from the BIOS for the panel, put them in
         * to the adjusted mode.  The CRTC will be set up for this mode,
         * with the panel scaling set up to source from the H/VDisplay
         * of the original mode.
         */
        if (fixed_mode)
                intel_fixed_panel_mode(fixed_mode, adjusted_mode);

        if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
                return -EINVAL;

        pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;

        return 0;
}

static void intel_dvo_pre_enable(struct intel_encoder *encoder,
                                 const struct intel_crtc_state *pipe_config,
                                 const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
        const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
        struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
        int pipe = crtc->pipe;
        u32 dvo_val;
        i915_reg_t dvo_reg = intel_dvo->dev.dvo_reg;
        i915_reg_t dvo_srcdim_reg = intel_dvo->dev.dvo_srcdim_reg;

        /* Save the data order, since I don't know what it should be set to. */
        dvo_val = I915_READ(dvo_reg) &
                  (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
        dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
                   DVO_BLANK_ACTIVE_HIGH;

        dvo_val |= DVO_PIPE_SEL(pipe);
        dvo_val |= DVO_PIPE_STALL;
        if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
                dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
        if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
                dvo_val |= DVO_VSYNC_ACTIVE_HIGH;

        /*I915_WRITE(DVOB_SRCDIM,
          (adjusted_mode->crtc_hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
          (adjusted_mode->crtc_vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
        I915_WRITE(dvo_srcdim_reg,
                   (adjusted_mode->crtc_hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
                   (adjusted_mode->crtc_vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
        /*I915_WRITE(DVOB, dvo_val);*/
        I915_WRITE(dvo_reg, dvo_val);
}

static enum drm_connector_status
intel_dvo_detect(struct drm_connector *connector, bool force)
{
        struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                      connector->base.id, connector->name);
        return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
}

static int intel_dvo_get_modes(struct drm_connector *connector)
{
        struct drm_i915_private *dev_priv = to_i915(connector->dev);
        const struct drm_display_mode *fixed_mode =
                to_intel_connector(connector)->panel.fixed_mode;

        /*
         * We should probably have an i2c driver get_modes function for those
         * devices which will have a fixed set of modes determined by the chip
         * (TV-out, for example), but for now with just TMDS and LVDS,
         * that's not the case.
         */
        intel_ddc_get_modes(connector,
                            intel_gmbus_get_adapter(dev_priv, GMBUS_PIN_DPC));
        if (!list_empty(&connector->probed_modes))
                return 1;

        if (fixed_mode) {
                struct drm_display_mode *mode;
                mode = drm_mode_duplicate(connector->dev, fixed_mode);
                if (mode) {
                        drm_mode_probed_add(connector, mode);
                        return 1;
                }
        }

        return 0;
}

static const struct drm_connector_funcs intel_dvo_connector_funcs = {
        .detect = intel_dvo_detect,
        .late_register = intel_connector_register,
        .early_unregister = intel_connector_unregister,
        .destroy = intel_connector_destroy,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
};

static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
        .mode_valid = intel_dvo_mode_valid,
        .get_modes = intel_dvo_get_modes,
};

static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
{
        struct intel_dvo *intel_dvo = enc_to_dvo(to_intel_encoder(encoder));

        if (intel_dvo->dev.dev_ops->destroy)
                intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);

        intel_encoder_destroy(encoder);
}

static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
        .destroy = intel_dvo_enc_destroy,
};

/*
 * Attempts to get a fixed panel timing for LVDS (currently only the i830).
 *
 * Other chips with DVO LVDS will need to extend this to deal with the LVDS
 * chip being on DVOB/C and having multiple pipes.
 */
static struct drm_display_mode *
intel_dvo_get_current_mode(struct intel_encoder *encoder)
{
        struct drm_display_mode *mode;

        mode = intel_encoder_current_mode(encoder);
        if (mode) {
                DRM_DEBUG_KMS("using current (BIOS) mode: ");
                drm_mode_debug_printmodeline(mode);
                mode->type |= DRM_MODE_TYPE_PREFERRED;
        }

        return mode;
}

static enum port intel_dvo_port(i915_reg_t dvo_reg)
{
        if (i915_mmio_reg_equal(dvo_reg, DVOA))
                return PORT_A;
        else if (i915_mmio_reg_equal(dvo_reg, DVOB))
                return PORT_B;
        else
                return PORT_C;
}

void intel_dvo_init(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *intel_encoder;
        struct intel_dvo *intel_dvo;
        struct intel_connector *intel_connector;
        int i;
        int encoder_type = DRM_MODE_ENCODER_NONE;

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

        intel_connector = intel_connector_alloc();
        if (!intel_connector) {
                kfree(intel_dvo);
                return;
        }

        intel_dvo->attached_connector = intel_connector;

        intel_encoder = &intel_dvo->base;

        intel_encoder->disable = intel_disable_dvo;
        intel_encoder->enable = intel_enable_dvo;
        intel_encoder->get_hw_state = intel_dvo_get_hw_state;
        intel_encoder->get_config = intel_dvo_get_config;
        intel_encoder->compute_config = intel_dvo_compute_config;
        intel_encoder->pre_enable = intel_dvo_pre_enable;
        intel_connector->get_hw_state = intel_dvo_connector_get_hw_state;

        /* Now, try to find a controller */
        for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
                struct drm_connector *connector = &intel_connector->base;
                const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
                struct i2c_adapter *i2c;
                int gpio;
                bool dvoinit;
                enum pipe pipe;
                u32 dpll[I915_MAX_PIPES];
                enum port port;

                /*
                 * Allow the I2C driver info to specify the GPIO to be used in
                 * special cases, but otherwise default to what's defined
                 * in the spec.
                 */
                if (intel_gmbus_is_valid_pin(dev_priv, dvo->gpio))
                        gpio = dvo->gpio;
                else if (dvo->type == INTEL_DVO_CHIP_LVDS)
                        gpio = GMBUS_PIN_SSC;
                else
                        gpio = GMBUS_PIN_DPB;

                /*
                 * Set up the I2C bus necessary for the chip we're probing.
                 * It appears that everything is on GPIOE except for panels
                 * on i830 laptops, which are on GPIOB (DVOA).
                 */
                i2c = intel_gmbus_get_adapter(dev_priv, gpio);

                intel_dvo->dev = *dvo;

                /*
                 * GMBUS NAK handling seems to be unstable, hence let the
                 * transmitter detection run in bit banging mode for now.
                 */
                intel_gmbus_force_bit(i2c, true);

                /*
                 * ns2501 requires the DVO 2x clock before it will
                 * respond to i2c accesses, so make sure we have
                 * have the clock enabled before we attempt to
                 * initialize the device.
                 */
                for_each_pipe(dev_priv, pipe) {
                        dpll[pipe] = I915_READ(DPLL(pipe));
                        I915_WRITE(DPLL(pipe), dpll[pipe] | DPLL_DVO_2X_MODE);
                }

                dvoinit = dvo->dev_ops->init(&intel_dvo->dev, i2c);

                /* restore the DVO 2x clock state to original */
                for_each_pipe(dev_priv, pipe) {
                        I915_WRITE(DPLL(pipe), dpll[pipe]);
                }

                intel_gmbus_force_bit(i2c, false);

                if (!dvoinit)
                        continue;

                port = intel_dvo_port(dvo->dvo_reg);
                drm_encoder_init(&dev_priv->drm, &intel_encoder->base,
                                 &intel_dvo_enc_funcs, encoder_type,
                                 "DVO %c", port_name(port));

                intel_encoder->type = INTEL_OUTPUT_DVO;
                intel_encoder->power_domain = POWER_DOMAIN_PORT_OTHER;
                intel_encoder->port = port;
                intel_encoder->crtc_mask = (1 << 0) | (1 << 1);

                switch (dvo->type) {
                case INTEL_DVO_CHIP_TMDS:
                        intel_encoder->cloneable = (1 << INTEL_OUTPUT_ANALOG) |
                                (1 << INTEL_OUTPUT_DVO);
                        drm_connector_init(&dev_priv->drm, connector,
                                           &intel_dvo_connector_funcs,
                                           DRM_MODE_CONNECTOR_DVII);
                        encoder_type = DRM_MODE_ENCODER_TMDS;
                        break;
                case INTEL_DVO_CHIP_LVDS:
                        intel_encoder->cloneable = 0;
                        drm_connector_init(&dev_priv->drm, connector,
                                           &intel_dvo_connector_funcs,
                                           DRM_MODE_CONNECTOR_LVDS);
                        encoder_type = DRM_MODE_ENCODER_LVDS;
                        break;
                }

                drm_connector_helper_add(connector,
                                         &intel_dvo_connector_helper_funcs);
                connector->display_info.subpixel_order = SubPixelHorizontalRGB;
                connector->interlace_allowed = false;
                connector->doublescan_allowed = false;

                intel_connector_attach_encoder(intel_connector, intel_encoder);
                if (dvo->type == INTEL_DVO_CHIP_LVDS) {
                        /*
                         * For our LVDS chipsets, we should hopefully be able
                         * to dig the fixed panel mode out of the BIOS data.
                         * However, it's in a different format from the BIOS
                         * data on chipsets with integrated LVDS (stored in AIM
                         * headers, likely), so for now, just get the current
                         * mode being output through DVO.
                         */
                        intel_panel_init(&intel_connector->panel,
                                         intel_dvo_get_current_mode(intel_encoder),
                                         NULL);
                        intel_dvo->panel_wants_dither = true;
                }

                return;
        }

        kfree(intel_dvo);
        kfree(intel_connector);
}