/*
 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that 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, see <http://www.gnu.org/licenses/>.
 */


#include "msm_drv.h"
#include "msm_mmu.h"
#include "mdp5_kms.h"

static const char *iommu_ports[] = {
		"mdp_0",
};

static int mdp5_hw_init(struct msm_kms *kms)
{
	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
	struct drm_device *dev = mdp5_kms->dev;
	unsigned long flags;

	pm_runtime_get_sync(dev->dev);

	/* Magic unknown register writes:
	 *
	 *    W VBIF:0x004 00000001      (mdss_mdp.c:839)
	 *    W MDP5:0x2e0 0xe9          (mdss_mdp.c:839)
	 *    W MDP5:0x2e4 0x55          (mdss_mdp.c:839)
	 *    W MDP5:0x3ac 0xc0000ccc    (mdss_mdp.c:839)
	 *    W MDP5:0x3b4 0xc0000ccc    (mdss_mdp.c:839)
	 *    W MDP5:0x3bc 0xcccccc      (mdss_mdp.c:839)
	 *    W MDP5:0x4a8 0xcccc0c0     (mdss_mdp.c:839)
	 *    W MDP5:0x4b0 0xccccc0c0    (mdss_mdp.c:839)
	 *    W MDP5:0x4b8 0xccccc000    (mdss_mdp.c:839)
	 *
	 * Downstream fbdev driver gets these register offsets/values
	 * from DT.. not really sure what these registers are or if
	 * different values for different boards/SoC's, etc.  I guess
	 * they are the golden registers.
	 *
	 * Not setting these does not seem to cause any problem.  But
	 * we may be getting lucky with the bootloader initializing
	 * them for us.  OTOH, if we can always count on the bootloader
	 * setting the golden registers, then perhaps we don't need to
	 * care.
	 */

	spin_lock_irqsave(&mdp5_kms->resource_lock, flags);
	mdp5_write(mdp5_kms, REG_MDP5_MDP_DISP_INTF_SEL(0), 0);
	spin_unlock_irqrestore(&mdp5_kms->resource_lock, flags);

	mdp5_ctlm_hw_reset(mdp5_kms->ctlm);

	pm_runtime_put_sync(dev->dev);

	return 0;
}

static void mdp5_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *state)
{
	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
	mdp5_enable(mdp5_kms);
}

static void mdp5_complete_commit(struct msm_kms *kms, struct drm_atomic_state *state)
{
	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
	mdp5_disable(mdp5_kms);
}

static long mdp5_round_pixclk(struct msm_kms *kms, unsigned long rate,
		struct drm_encoder *encoder)
{
	return rate;
}

static int mdp5_set_split_display(struct msm_kms *kms,
		struct drm_encoder *encoder,
		struct drm_encoder *slave_encoder,
		bool is_cmd_mode)
{
	if (is_cmd_mode)
		return mdp5_cmd_encoder_set_split_display(encoder,
							slave_encoder);
	else
		return mdp5_encoder_set_split_display(encoder, slave_encoder);
}

static void mdp5_preclose(struct msm_kms *kms, struct drm_file *file)
{
	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
	struct msm_drm_private *priv = mdp5_kms->dev->dev_private;
	unsigned i;

	for (i = 0; i < priv->num_crtcs; i++)
		mdp5_crtc_cancel_pending_flip(priv->crtcs[i], file);
}

static void mdp5_destroy(struct msm_kms *kms)
{
	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
	struct msm_mmu *mmu = mdp5_kms->mmu;

	mdp5_irq_domain_fini(mdp5_kms);

	if (mmu) {
		mmu->funcs->detach(mmu, iommu_ports, ARRAY_SIZE(iommu_ports));
		mmu->funcs->destroy(mmu);
	}

	if (mdp5_kms->ctlm)
		mdp5_ctlm_destroy(mdp5_kms->ctlm);
	if (mdp5_kms->smp)
		mdp5_smp_destroy(mdp5_kms->smp);
	if (mdp5_kms->cfg)
		mdp5_cfg_destroy(mdp5_kms->cfg);

	kfree(mdp5_kms);
}

static const struct mdp_kms_funcs kms_funcs = {
	.base = {
		.hw_init         = mdp5_hw_init,
		.irq_preinstall  = mdp5_irq_preinstall,
		.irq_postinstall = mdp5_irq_postinstall,
		.irq_uninstall   = mdp5_irq_uninstall,
		.irq             = mdp5_irq,
		.enable_vblank   = mdp5_enable_vblank,
		.disable_vblank  = mdp5_disable_vblank,
		.prepare_commit  = mdp5_prepare_commit,
		.complete_commit = mdp5_complete_commit,
		.get_format      = mdp_get_format,
		.round_pixclk    = mdp5_round_pixclk,
		.set_split_display = mdp5_set_split_display,
		.preclose        = mdp5_preclose,
		.destroy         = mdp5_destroy,
	},
	.set_irqmask         = mdp5_set_irqmask,
};

int mdp5_disable(struct mdp5_kms *mdp5_kms)
{
	DBG("");

	clk_disable_unprepare(mdp5_kms->ahb_clk);
	clk_disable_unprepare(mdp5_kms->axi_clk);
	clk_disable_unprepare(mdp5_kms->core_clk);
	clk_disable_unprepare(mdp5_kms->lut_clk);

	return 0;
}

int mdp5_enable(struct mdp5_kms *mdp5_kms)
{
	DBG("");

	clk_prepare_enable(mdp5_kms->ahb_clk);
	clk_prepare_enable(mdp5_kms->axi_clk);
	clk_prepare_enable(mdp5_kms->core_clk);
	clk_prepare_enable(mdp5_kms->lut_clk);

	return 0;
}

static struct drm_encoder *construct_encoder(struct mdp5_kms *mdp5_kms,
		enum mdp5_intf_type intf_type, int intf_num,
		enum mdp5_intf_mode intf_mode)
{
	struct drm_device *dev = mdp5_kms->dev;
	struct msm_drm_private *priv = dev->dev_private;
	struct drm_encoder *encoder;
	struct mdp5_interface intf = {
			.num	= intf_num,
			.type	= intf_type,
			.mode	= intf_mode,
	};

	if ((intf_type == INTF_DSI) &&
		(intf_mode == MDP5_INTF_DSI_MODE_COMMAND))
		encoder = mdp5_cmd_encoder_init(dev, &intf);
	else
		encoder = mdp5_encoder_init(dev, &intf);

	if (IS_ERR(encoder)) {
		dev_err(dev->dev, "failed to construct encoder\n");
		return encoder;
	}

	encoder->possible_crtcs = (1 << priv->num_crtcs) - 1;
	priv->encoders[priv->num_encoders++] = encoder;

	return encoder;
}

static int get_dsi_id_from_intf(const struct mdp5_cfg_hw *hw_cfg, int intf_num)
{
	const int intf_cnt = hw_cfg->intf.count;
	const u32 *intfs = hw_cfg->intfs;
	int id = 0, i;

	for (i = 0; i < intf_cnt; i++) {
		if (intfs[i] == INTF_DSI) {
			if (intf_num == i)
				return id;

			id++;
		}
	}

	return -EINVAL;
}

static int modeset_init_intf(struct mdp5_kms *mdp5_kms, int intf_num)
{
	struct drm_device *dev = mdp5_kms->dev;
	struct msm_drm_private *priv = dev->dev_private;
	const struct mdp5_cfg_hw *hw_cfg =
					mdp5_cfg_get_hw_config(mdp5_kms->cfg);
	enum mdp5_intf_type intf_type = hw_cfg->intfs[intf_num];
	struct drm_encoder *encoder;
	int ret = 0;

	switch (intf_type) {
	case INTF_DISABLED:
		break;
	case INTF_eDP:
		if (!priv->edp)
			break;

		encoder = construct_encoder(mdp5_kms, INTF_eDP, intf_num,
					MDP5_INTF_MODE_NONE);
		if (IS_ERR(encoder)) {
			ret = PTR_ERR(encoder);
			break;
		}

		ret = msm_edp_modeset_init(priv->edp, dev, encoder);
		break;
	case INTF_HDMI:
		if (!priv->hdmi)
			break;

		encoder = construct_encoder(mdp5_kms, INTF_HDMI, intf_num,
					MDP5_INTF_MODE_NONE);
		if (IS_ERR(encoder)) {
			ret = PTR_ERR(encoder);
			break;
		}

		ret = hdmi_modeset_init(priv->hdmi, dev, encoder);
		break;
	case INTF_DSI:
	{
		int dsi_id = get_dsi_id_from_intf(hw_cfg, intf_num);
		struct drm_encoder *dsi_encs[MSM_DSI_ENCODER_NUM];
		enum mdp5_intf_mode mode;
		int i;

		if ((dsi_id >= ARRAY_SIZE(priv->dsi)) || (dsi_id < 0)) {
			dev_err(dev->dev, "failed to find dsi from intf %d\n",
				intf_num);
			ret = -EINVAL;
			break;
		}

		if (!priv->dsi[dsi_id])
			break;

		for (i = 0; i < MSM_DSI_ENCODER_NUM; i++) {
			mode = (i == MSM_DSI_CMD_ENCODER_ID) ?
				MDP5_INTF_DSI_MODE_COMMAND :
				MDP5_INTF_DSI_MODE_VIDEO;
			dsi_encs[i] = construct_encoder(mdp5_kms, INTF_DSI,
							intf_num, mode);
			if (IS_ERR(dsi_encs)) {
				ret = PTR_ERR(dsi_encs);
				break;
			}
		}

		ret = msm_dsi_modeset_init(priv->dsi[dsi_id], dev, dsi_encs);
		break;
	}
	default:
		dev_err(dev->dev, "unknown intf: %d\n", intf_type);
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int modeset_init(struct mdp5_kms *mdp5_kms)
{
	static const enum mdp5_pipe crtcs[] = {
			SSPP_RGB0, SSPP_RGB1, SSPP_RGB2, SSPP_RGB3,
	};
	static const enum mdp5_pipe pub_planes[] = {
			SSPP_VIG0, SSPP_VIG1, SSPP_VIG2, SSPP_VIG3,
	};
	struct drm_device *dev = mdp5_kms->dev;
	struct msm_drm_private *priv = dev->dev_private;
	const struct mdp5_cfg_hw *hw_cfg;
	int i, ret;

	hw_cfg = mdp5_cfg_get_hw_config(mdp5_kms->cfg);

	/* register our interrupt-controller for hdmi/eDP/dsi/etc
	 * to use for irqs routed through mdp:
	 */
	ret = mdp5_irq_domain_init(mdp5_kms);
	if (ret)
		goto fail;

	/* construct CRTCs and their private planes: */
	for (i = 0; i < hw_cfg->pipe_rgb.count; i++) {
		struct drm_plane *plane;
		struct drm_crtc *crtc;

		plane = mdp5_plane_init(dev, crtcs[i], true,
				hw_cfg->pipe_rgb.base[i]);
		if (IS_ERR(plane)) {
			ret = PTR_ERR(plane);
			dev_err(dev->dev, "failed to construct plane for %s (%d)\n",
					pipe2name(crtcs[i]), ret);
			goto fail;
		}

		crtc  = mdp5_crtc_init(dev, plane, i);
		if (IS_ERR(crtc)) {
			ret = PTR_ERR(crtc);
			dev_err(dev->dev, "failed to construct crtc for %s (%d)\n",
					pipe2name(crtcs[i]), ret);
			goto fail;
		}
		priv->crtcs[priv->num_crtcs++] = crtc;
	}

	/* Construct public planes: */
	for (i = 0; i < hw_cfg->pipe_vig.count; i++) {
		struct drm_plane *plane;

		plane = mdp5_plane_init(dev, pub_planes[i], false,
				hw_cfg->pipe_vig.base[i]);
		if (IS_ERR(plane)) {
			ret = PTR_ERR(plane);
			dev_err(dev->dev, "failed to construct %s plane: %d\n",
					pipe2name(pub_planes[i]), ret);
			goto fail;
		}
	}

	/* Construct encoders and modeset initialize connector devices
	 * for each external display interface.
	 */
	for (i = 0; i < ARRAY_SIZE(hw_cfg->intfs); i++) {
		ret = modeset_init_intf(mdp5_kms, i);
		if (ret)
			goto fail;
	}

	return 0;

fail:
	return ret;
}

static void read_hw_revision(struct mdp5_kms *mdp5_kms,
		uint32_t *major, uint32_t *minor)
{
	uint32_t version;

	mdp5_enable(mdp5_kms);
	version = mdp5_read(mdp5_kms, REG_MDSS_HW_VERSION);
	mdp5_disable(mdp5_kms);

	*major = FIELD(version, MDSS_HW_VERSION_MAJOR);
	*minor = FIELD(version, MDSS_HW_VERSION_MINOR);

	DBG("MDP5 version v%d.%d", *major, *minor);
}

static int get_clk(struct platform_device *pdev, struct clk **clkp,
		const char *name)
{
	struct device *dev = &pdev->dev;
	struct clk *clk = devm_clk_get(dev, name);
	if (IS_ERR(clk)) {
		dev_err(dev, "failed to get %s (%ld)\n", name, PTR_ERR(clk));
		return PTR_ERR(clk);
	}
	*clkp = clk;
	return 0;
}

struct msm_kms *mdp5_kms_init(struct drm_device *dev)
{
	struct platform_device *pdev = dev->platformdev;
	struct mdp5_cfg *config;
	struct mdp5_kms *mdp5_kms;
	struct msm_kms *kms = NULL;
	struct msm_mmu *mmu;
	uint32_t major, minor;
	int i, ret;

	mdp5_kms = kzalloc(sizeof(*mdp5_kms), GFP_KERNEL);
	if (!mdp5_kms) {
		dev_err(dev->dev, "failed to allocate kms\n");
		ret = -ENOMEM;
		goto fail;
	}

	spin_lock_init(&mdp5_kms->resource_lock);

	mdp_kms_init(&mdp5_kms->base, &kms_funcs);

	kms = &mdp5_kms->base.base;

	mdp5_kms->dev = dev;

	/* mdp5_kms->mmio actually represents the MDSS base address */
	mdp5_kms->mmio = msm_ioremap(pdev, "mdp_phys", "MDP5");
	if (IS_ERR(mdp5_kms->mmio)) {
		ret = PTR_ERR(mdp5_kms->mmio);
		goto fail;
	}

	mdp5_kms->vbif = msm_ioremap(pdev, "vbif_phys", "VBIF");
	if (IS_ERR(mdp5_kms->vbif)) {
		ret = PTR_ERR(mdp5_kms->vbif);
		goto fail;
	}

	mdp5_kms->vdd = devm_regulator_get(&pdev->dev, "vdd");
	if (IS_ERR(mdp5_kms->vdd)) {
		ret = PTR_ERR(mdp5_kms->vdd);
		goto fail;
	}

	ret = regulator_enable(mdp5_kms->vdd);
	if (ret) {
		dev_err(dev->dev, "failed to enable regulator vdd: %d\n", ret);
		goto fail;
	}

	ret = get_clk(pdev, &mdp5_kms->axi_clk, "bus_clk");
	if (ret)
		goto fail;
	ret = get_clk(pdev, &mdp5_kms->ahb_clk, "iface_clk");
	if (ret)
		goto fail;
	ret = get_clk(pdev, &mdp5_kms->src_clk, "core_clk_src");
	if (ret)
		goto fail;
	ret = get_clk(pdev, &mdp5_kms->core_clk, "core_clk");
	if (ret)
		goto fail;
	ret = get_clk(pdev, &mdp5_kms->lut_clk, "lut_clk");
	if (ret)
		goto fail;
	ret = get_clk(pdev, &mdp5_kms->vsync_clk, "vsync_clk");
	if (ret)
		goto fail;

	/* we need to set a default rate before enabling.  Set a safe
	 * rate first, then figure out hw revision, and then set a
	 * more optimal rate:
	 */
	clk_set_rate(mdp5_kms->src_clk, 200000000);

	read_hw_revision(mdp5_kms, &major, &minor);

	mdp5_kms->cfg = mdp5_cfg_init(mdp5_kms, major, minor);
	if (IS_ERR(mdp5_kms->cfg)) {
		ret = PTR_ERR(mdp5_kms->cfg);
		mdp5_kms->cfg = NULL;
		goto fail;
	}

	config = mdp5_cfg_get_config(mdp5_kms->cfg);

	/* TODO: compute core clock rate at runtime */
	clk_set_rate(mdp5_kms->src_clk, config->hw->max_clk);

	mdp5_kms->smp = mdp5_smp_init(mdp5_kms->dev, &config->hw->smp);
	if (IS_ERR(mdp5_kms->smp)) {
		ret = PTR_ERR(mdp5_kms->smp);
		mdp5_kms->smp = NULL;
		goto fail;
	}

	mdp5_kms->ctlm = mdp5_ctlm_init(dev, mdp5_kms->mmio, config->hw);
	if (IS_ERR(mdp5_kms->ctlm)) {
		ret = PTR_ERR(mdp5_kms->ctlm);
		mdp5_kms->ctlm = NULL;
		goto fail;
	}

	/* make sure things are off before attaching iommu (bootloader could
	 * have left things on, in which case we'll start getting faults if
	 * we don't disable):
	 */
	mdp5_enable(mdp5_kms);
	for (i = 0; i < MDP5_INTF_NUM_MAX; i++) {
		if (!config->hw->intf.base[i] ||
				mdp5_cfg_intf_is_virtual(config->hw->intfs[i]))
			continue;
		mdp5_write(mdp5_kms, REG_MDP5_INTF_TIMING_ENGINE_EN(i), 0);
	}
	mdp5_disable(mdp5_kms);
	mdelay(16);

	if (config->platform.iommu) {
		mmu = msm_iommu_new(&pdev->dev, config->platform.iommu);
		if (IS_ERR(mmu)) {
			ret = PTR_ERR(mmu);
			dev_err(dev->dev, "failed to init iommu: %d\n", ret);
			goto fail;
		}

		ret = mmu->funcs->attach(mmu, iommu_ports,
				ARRAY_SIZE(iommu_ports));
		if (ret) {
			dev_err(dev->dev, "failed to attach iommu: %d\n", ret);
			mmu->funcs->destroy(mmu);
			goto fail;
		}
	} else {
		dev_info(dev->dev, "no iommu, fallback to phys "
				"contig buffers for scanout\n");
		mmu = NULL;
	}
	mdp5_kms->mmu = mmu;

	mdp5_kms->id = msm_register_mmu(dev, mmu);
	if (mdp5_kms->id < 0) {
		ret = mdp5_kms->id;
		dev_err(dev->dev, "failed to register mdp5 iommu: %d\n", ret);
		goto fail;
	}

	ret = modeset_init(mdp5_kms);
	if (ret) {
		dev_err(dev->dev, "modeset_init failed: %d\n", ret);
		goto fail;
	}

	return kms;

fail:
	if (kms)
		mdp5_destroy(kms);
	return ERR_PTR(ret);
}