// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Russell King
 *  Rewritten from the dovefb driver, and Armada510 manuals.
 */

#include <linux/clk.h>
#include <linux/component.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/property.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>

#include "armada_crtc.h"
#include "armada_drm.h"
#include "armada_fb.h"
#include "armada_gem.h"
#include "armada_hw.h"
#include "armada_plane.h"
#include "armada_trace.h"

/*
 * A note about interlacing.  Let's consider HDMI 1920x1080i.
 * The timing parameters we have from X are:
 *  Hact HsyA HsyI Htot  Vact VsyA VsyI Vtot
 *  1920 2448 2492 2640  1080 1084 1094 1125
 * Which get translated to:
 *  Hact HsyA HsyI Htot  Vact VsyA VsyI Vtot
 *  1920 2448 2492 2640   540  542  547  562
 *
 * This is how it is defined by CEA-861-D - line and pixel numbers are
 * referenced to the rising edge of VSYNC and HSYNC.  Total clocks per
 * line: 2640.  The odd frame, the first active line is at line 21, and
 * the even frame, the first active line is 584.
 *
 * LN:    560     561     562     563             567     568    569
 * DE:    ~~~|____________________________//__________________________
 * HSYNC: ____|~|_____|~|_____|~|_____|~|_//__|~|_____|~|_____|~|_____
 * VSYNC: _________________________|~~~~~~//~~~~~~~~~~~~~~~|__________
 *  22 blanking lines.  VSYNC at 1320 (referenced to the HSYNC rising edge).
 *
 * LN:    1123   1124    1125      1               5       6      7
 * DE:    ~~~|____________________________//__________________________
 * HSYNC: ____|~|_____|~|_____|~|_____|~|_//__|~|_____|~|_____|~|_____
 * VSYNC: ____________________|~~~~~~~~~~~//~~~~~~~~~~|_______________
 *  23 blanking lines
 *
 * The Armada LCD Controller line and pixel numbers are, like X timings,
 * referenced to the top left of the active frame.
 *
 * So, translating these to our LCD controller:
 *  Odd frame, 563 total lines, VSYNC at line 543-548, pixel 1128.
 *  Even frame, 562 total lines, VSYNC at line 542-547, pixel 2448.
 * Note: Vsync front porch remains constant!
 *
 * if (odd_frame) {
 *   vtotal = mode->crtc_vtotal + 1;
 *   vbackporch = mode->crtc_vsync_start - mode->crtc_vdisplay + 1;
 *   vhorizpos = mode->crtc_hsync_start - mode->crtc_htotal / 2
 * } else {
 *   vtotal = mode->crtc_vtotal;
 *   vbackporch = mode->crtc_vsync_start - mode->crtc_vdisplay;
 *   vhorizpos = mode->crtc_hsync_start;
 * }
 * vfrontporch = mode->crtc_vtotal - mode->crtc_vsync_end;
 *
 * So, we need to reprogram these registers on each vsync event:
 *  LCD_SPU_V_PORCH, LCD_SPU_ADV_REG, LCD_SPUT_V_H_TOTAL
 *
 * Note: we do not use the frame done interrupts because these appear
 * to happen too early, and lead to jitter on the display (presumably
 * they occur at the end of the last active line, before the vsync back
 * porch, which we're reprogramming.)
 */

void
armada_drm_crtc_update_regs(struct armada_crtc *dcrtc, struct armada_regs *regs)
{
        while (regs->offset != ~0) {
                void __iomem *reg = dcrtc->base + regs->offset;
                uint32_t val;

                val = regs->mask;
                if (val != 0)
                        val &= readl_relaxed(reg);
                writel_relaxed(val | regs->val, reg);
                ++regs;
        }
}

static void armada_drm_crtc_update(struct armada_crtc *dcrtc, bool enable)
{
        uint32_t dumb_ctrl;

        dumb_ctrl = dcrtc->cfg_dumb_ctrl;

        if (enable)
                dumb_ctrl |= CFG_DUMB_ENA;

        /*
         * When the dumb interface isn't in DUMB24_RGB888_0 mode, it might
         * be using SPI or GPIO.  If we set this to DUMB_BLANK, we will
         * force LCD_D[23:0] to output blank color, overriding the GPIO or
         * SPI usage.  So leave it as-is unless in DUMB24_RGB888_0 mode.
         */
        if (!enable && (dumb_ctrl & DUMB_MASK) == DUMB24_RGB888_0) {
                dumb_ctrl &= ~DUMB_MASK;
                dumb_ctrl |= DUMB_BLANK;
        }

        armada_updatel(dumb_ctrl,
                       ~(CFG_INV_CSYNC | CFG_INV_HSYNC | CFG_INV_VSYNC),
                       dcrtc->base + LCD_SPU_DUMB_CTRL);
}

static void armada_drm_crtc_queue_state_event(struct drm_crtc *crtc)
{
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
        struct drm_pending_vblank_event *event;

        /* If we have an event, we need vblank events enabled */
        event = xchg(&crtc->state->event, NULL);
        if (event) {
                WARN_ON(drm_crtc_vblank_get(crtc) != 0);
                dcrtc->event = event;
        }
}

static void armada_drm_update_gamma(struct drm_crtc *crtc)
{
        struct drm_property_blob *blob = crtc->state->gamma_lut;
        void __iomem *base = drm_to_armada_crtc(crtc)->base;
        int i;

        if (blob) {
                struct drm_color_lut *lut = blob->data;

                armada_updatel(CFG_CSB_256x8, CFG_CSB_256x8 | CFG_PDWN256x8,
                               base + LCD_SPU_SRAM_PARA1);

                for (i = 0; i < 256; i++) {
                        writel_relaxed(drm_color_lut_extract(lut[i].red, 8),
                                       base + LCD_SPU_SRAM_WRDAT);
                        writel_relaxed(i | SRAM_WRITE | SRAM_GAMMA_YR,
                                       base + LCD_SPU_SRAM_CTRL);
                        readl_relaxed(base + LCD_SPU_HWC_OVSA_HPXL_VLN);
                        writel_relaxed(drm_color_lut_extract(lut[i].green, 8),
                                       base + LCD_SPU_SRAM_WRDAT);
                        writel_relaxed(i | SRAM_WRITE | SRAM_GAMMA_UG,
                                       base + LCD_SPU_SRAM_CTRL);
                        readl_relaxed(base + LCD_SPU_HWC_OVSA_HPXL_VLN);
                        writel_relaxed(drm_color_lut_extract(lut[i].blue, 8),
                                       base + LCD_SPU_SRAM_WRDAT);
                        writel_relaxed(i | SRAM_WRITE | SRAM_GAMMA_VB,
                                       base + LCD_SPU_SRAM_CTRL);
                        readl_relaxed(base + LCD_SPU_HWC_OVSA_HPXL_VLN);
                }
                armada_updatel(CFG_GAMMA_ENA, CFG_GAMMA_ENA,
                               base + LCD_SPU_DMA_CTRL0);
        } else {
                armada_updatel(0, CFG_GAMMA_ENA, base + LCD_SPU_DMA_CTRL0);
                armada_updatel(CFG_PDWN256x8, CFG_CSB_256x8 | CFG_PDWN256x8,
                               base + LCD_SPU_SRAM_PARA1);
        }
}

static enum drm_mode_status armada_drm_crtc_mode_valid(struct drm_crtc *crtc,
        const struct drm_display_mode *mode)
{
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);

        if (mode->vscan > 1)
                return MODE_NO_VSCAN;

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

        if (mode->flags & DRM_MODE_FLAG_HSKEW)
                return MODE_H_ILLEGAL;

        /* We can't do interlaced modes if we don't have the SPU_ADV_REG */
        if (!dcrtc->variant->has_spu_adv_reg &&
            mode->flags & DRM_MODE_FLAG_INTERLACE)
                return MODE_NO_INTERLACE;

        if (mode->flags & (DRM_MODE_FLAG_BCAST | DRM_MODE_FLAG_PIXMUX |
                           DRM_MODE_FLAG_CLKDIV2))
                return MODE_BAD;

        return MODE_OK;
}

/* The mode_config.mutex will be held for this call */
static bool armada_drm_crtc_mode_fixup(struct drm_crtc *crtc,
        const struct drm_display_mode *mode, struct drm_display_mode *adj)
{
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
        int ret;

        /*
         * Set CRTC modesetting parameters for the adjusted mode.  This is
         * applied after the connectors, bridges, and encoders have fixed up
         * this mode, as described above drm_atomic_helper_check_modeset().
         */
        drm_mode_set_crtcinfo(adj, CRTC_INTERLACE_HALVE_V);

        /*
         * Validate the adjusted mode in case an encoder/bridge has set
         * something we don't support.
         */
        if (armada_drm_crtc_mode_valid(crtc, adj) != MODE_OK)
                return false;

        /* Check whether the display mode is possible */
        ret = dcrtc->variant->compute_clock(dcrtc, adj, NULL);
        if (ret)
                return false;

        return true;
}

/* These are locked by dev->vbl_lock */
static void armada_drm_crtc_disable_irq(struct armada_crtc *dcrtc, u32 mask)
{
        if (dcrtc->irq_ena & mask) {
                dcrtc->irq_ena &= ~mask;
                writel(dcrtc->irq_ena, dcrtc->base + LCD_SPU_IRQ_ENA);
        }
}

static void armada_drm_crtc_enable_irq(struct armada_crtc *dcrtc, u32 mask)
{
        if ((dcrtc->irq_ena & mask) != mask) {
                dcrtc->irq_ena |= mask;
                writel(dcrtc->irq_ena, dcrtc->base + LCD_SPU_IRQ_ENA);
                if (readl_relaxed(dcrtc->base + LCD_SPU_IRQ_ISR) & mask)
                        writel(0, dcrtc->base + LCD_SPU_IRQ_ISR);
        }
}

static void armada_drm_crtc_irq(struct armada_crtc *dcrtc, u32 stat)
{
        struct drm_pending_vblank_event *event;
        void __iomem *base = dcrtc->base;

        if (stat & DMA_FF_UNDERFLOW)
                DRM_ERROR("video underflow on crtc %u\n", dcrtc->num);
        if (stat & GRA_FF_UNDERFLOW)
                DRM_ERROR("graphics underflow on crtc %u\n", dcrtc->num);

        if (stat & VSYNC_IRQ)
                drm_crtc_handle_vblank(&dcrtc->crtc);

        spin_lock(&dcrtc->irq_lock);
        if (stat & GRA_FRAME_IRQ && dcrtc->interlaced) {
                int i = stat & GRA_FRAME_IRQ0 ? 0 : 1;
                uint32_t val;

                writel_relaxed(dcrtc->v[i].spu_v_porch, base + LCD_SPU_V_PORCH);
                writel_relaxed(dcrtc->v[i].spu_v_h_total,
                               base + LCD_SPUT_V_H_TOTAL);

                val = readl_relaxed(base + LCD_SPU_ADV_REG);
                val &= ~(ADV_VSYNC_L_OFF | ADV_VSYNC_H_OFF | ADV_VSYNCOFFEN);
                val |= dcrtc->v[i].spu_adv_reg;
                writel_relaxed(val, base + LCD_SPU_ADV_REG);
        }

        if (stat & dcrtc->irq_ena & DUMB_FRAMEDONE) {
                if (dcrtc->update_pending) {
                        armada_drm_crtc_update_regs(dcrtc, dcrtc->regs);
                        dcrtc->update_pending = false;
                }
                if (dcrtc->cursor_update) {
                        writel_relaxed(dcrtc->cursor_hw_pos,
                                       base + LCD_SPU_HWC_OVSA_HPXL_VLN);
                        writel_relaxed(dcrtc->cursor_hw_sz,
                                       base + LCD_SPU_HWC_HPXL_VLN);
                        armada_updatel(CFG_HWC_ENA,
                                       CFG_HWC_ENA | CFG_HWC_1BITMOD |
                                       CFG_HWC_1BITENA,
                                       base + LCD_SPU_DMA_CTRL0);
                        dcrtc->cursor_update = false;
                }
                armada_drm_crtc_disable_irq(dcrtc, DUMB_FRAMEDONE_ENA);
        }
        spin_unlock(&dcrtc->irq_lock);

        if (stat & VSYNC_IRQ && !dcrtc->update_pending) {
                event = xchg(&dcrtc->event, NULL);
                if (event) {
                        spin_lock(&dcrtc->crtc.dev->event_lock);
                        drm_crtc_send_vblank_event(&dcrtc->crtc, event);
                        spin_unlock(&dcrtc->crtc.dev->event_lock);
                        drm_crtc_vblank_put(&dcrtc->crtc);
                }
        }
}

static irqreturn_t armada_drm_irq(int irq, void *arg)
{
        struct armada_crtc *dcrtc = arg;
        u32 v, stat = readl_relaxed(dcrtc->base + LCD_SPU_IRQ_ISR);

        /*
         * Reading the ISR appears to clear bits provided CLEAN_SPU_IRQ_ISR
         * is set.  Writing has some other effect to acknowledge the IRQ -
         * without this, we only get a single IRQ.
         */
        writel_relaxed(0, dcrtc->base + LCD_SPU_IRQ_ISR);

        trace_armada_drm_irq(&dcrtc->crtc, stat);

        /* Mask out those interrupts we haven't enabled */
        v = stat & dcrtc->irq_ena;

        if (v & (VSYNC_IRQ|GRA_FRAME_IRQ|DUMB_FRAMEDONE)) {
                armada_drm_crtc_irq(dcrtc, stat);
                return IRQ_HANDLED;
        }
        return IRQ_NONE;
}

/* The mode_config.mutex will be held for this call */
static void armada_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
        struct drm_display_mode *adj = &crtc->state->adjusted_mode;
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
        struct armada_regs regs[17];
        uint32_t lm, rm, tm, bm, val, sclk;
        unsigned long flags;
        unsigned i;
        bool interlaced = !!(adj->flags & DRM_MODE_FLAG_INTERLACE);

        i = 0;
        rm = adj->crtc_hsync_start - adj->crtc_hdisplay;
        lm = adj->crtc_htotal - adj->crtc_hsync_end;
        bm = adj->crtc_vsync_start - adj->crtc_vdisplay;
        tm = adj->crtc_vtotal - adj->crtc_vsync_end;

        DRM_DEBUG_KMS("[CRTC:%d:%s] mode " DRM_MODE_FMT "\n",
                      crtc->base.id, crtc->name, DRM_MODE_ARG(adj));
        DRM_DEBUG_KMS("lm %d rm %d tm %d bm %d\n", lm, rm, tm, bm);

        /* Now compute the divider for real */
        dcrtc->variant->compute_clock(dcrtc, adj, &sclk);

        armada_reg_queue_set(regs, i, sclk, LCD_CFG_SCLK_DIV);

        spin_lock_irqsave(&dcrtc->irq_lock, flags);

        dcrtc->interlaced = interlaced;
        /* Even interlaced/progressive frame */
        dcrtc->v[1].spu_v_h_total = adj->crtc_vtotal << 16 |
                                    adj->crtc_htotal;
        dcrtc->v[1].spu_v_porch = tm << 16 | bm;
        val = adj->crtc_hsync_start;
        dcrtc->v[1].spu_adv_reg = val << 20 | val | ADV_VSYNCOFFEN;

        if (interlaced) {
                /* Odd interlaced frame */
                val -= adj->crtc_htotal / 2;
                dcrtc->v[0].spu_adv_reg = val << 20 | val | ADV_VSYNCOFFEN;
                dcrtc->v[0].spu_v_h_total = dcrtc->v[1].spu_v_h_total +
                                                (1 << 16);
                dcrtc->v[0].spu_v_porch = dcrtc->v[1].spu_v_porch + 1;
        } else {
                dcrtc->v[0] = dcrtc->v[1];
        }

        val = adj->crtc_vdisplay << 16 | adj->crtc_hdisplay;

        armada_reg_queue_set(regs, i, val, LCD_SPU_V_H_ACTIVE);
        armada_reg_queue_set(regs, i, (lm << 16) | rm, LCD_SPU_H_PORCH);
        armada_reg_queue_set(regs, i, dcrtc->v[0].spu_v_porch, LCD_SPU_V_PORCH);
        armada_reg_queue_set(regs, i, dcrtc->v[0].spu_v_h_total,
                           LCD_SPUT_V_H_TOTAL);

        if (dcrtc->variant->has_spu_adv_reg)
                armada_reg_queue_mod(regs, i, dcrtc->v[0].spu_adv_reg,
                                     ADV_VSYNC_L_OFF | ADV_VSYNC_H_OFF |
                                     ADV_VSYNCOFFEN, LCD_SPU_ADV_REG);

        val = adj->flags & DRM_MODE_FLAG_NVSYNC ? CFG_VSYNC_INV : 0;
        armada_reg_queue_mod(regs, i, val, CFG_VSYNC_INV, LCD_SPU_DMA_CTRL1);

        /*
         * The documentation doesn't indicate what the normal state of
         * the sync signals are.  Sebastian Hesselbart kindly probed
         * these signals on his board to determine their state.
         *
         * The non-inverted state of the sync signals is active high.
         * Setting these bits makes the appropriate signal active low.
         */
        val = 0;
        if (adj->flags & DRM_MODE_FLAG_NCSYNC)
                val |= CFG_INV_CSYNC;
        if (adj->flags & DRM_MODE_FLAG_NHSYNC)
                val |= CFG_INV_HSYNC;
        if (adj->flags & DRM_MODE_FLAG_NVSYNC)
                val |= CFG_INV_VSYNC;
        armada_reg_queue_mod(regs, i, val, CFG_INV_CSYNC | CFG_INV_HSYNC |
                             CFG_INV_VSYNC, LCD_SPU_DUMB_CTRL);
        armada_reg_queue_end(regs, i);

        armada_drm_crtc_update_regs(dcrtc, regs);
        spin_unlock_irqrestore(&dcrtc->irq_lock, flags);
}

static int armada_drm_crtc_atomic_check(struct drm_crtc *crtc,
                                        struct drm_atomic_state *state)
{
        struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
                                                                          crtc);
        DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);

        if (crtc_state->gamma_lut && drm_color_lut_size(crtc_state->gamma_lut) != 256)
                return -EINVAL;

        if (crtc_state->color_mgmt_changed)
                crtc_state->planes_changed = true;

        return 0;
}

static void armada_drm_crtc_atomic_begin(struct drm_crtc *crtc,
                                         struct drm_atomic_state *state)
{
        struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
                                                                          crtc);
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);

        DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);

        if (crtc_state->color_mgmt_changed)
                armada_drm_update_gamma(crtc);

        dcrtc->regs_idx = 0;
        dcrtc->regs = dcrtc->atomic_regs;
}

static void armada_drm_crtc_atomic_flush(struct drm_crtc *crtc,
                                         struct drm_atomic_state *state)
{
        struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
                                                                          crtc);
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);

        DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);

        armada_reg_queue_end(dcrtc->regs, dcrtc->regs_idx);

        /*
         * If we aren't doing a full modeset, then we need to queue
         * the event here.
         */
        if (!drm_atomic_crtc_needs_modeset(crtc_state)) {
                dcrtc->update_pending = true;
                armada_drm_crtc_queue_state_event(crtc);
                spin_lock_irq(&dcrtc->irq_lock);
                armada_drm_crtc_enable_irq(dcrtc, DUMB_FRAMEDONE_ENA);
                spin_unlock_irq(&dcrtc->irq_lock);
        } else {
                spin_lock_irq(&dcrtc->irq_lock);
                armada_drm_crtc_update_regs(dcrtc, dcrtc->regs);
                spin_unlock_irq(&dcrtc->irq_lock);
        }
}

static void armada_drm_crtc_atomic_disable(struct drm_crtc *crtc,
                                           struct drm_atomic_state *state)
{
        struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state,
                                                                         crtc);
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
        struct drm_pending_vblank_event *event;

        DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);

        if (old_state->adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                drm_crtc_vblank_put(crtc);

        drm_crtc_vblank_off(crtc);
        armada_drm_crtc_update(dcrtc, false);

        if (!crtc->state->active) {
                /*
                 * This modeset will be leaving the CRTC disabled, so
                 * call the backend to disable upstream clocks etc.
                 */
                if (dcrtc->variant->disable)
                        dcrtc->variant->disable(dcrtc);

                /*
                 * We will not receive any further vblank events.
                 * Send the flip_done event manually.
                 */
                event = crtc->state->event;
                crtc->state->event = NULL;
                if (event) {
                        spin_lock_irq(&crtc->dev->event_lock);
                        drm_crtc_send_vblank_event(crtc, event);
                        spin_unlock_irq(&crtc->dev->event_lock);
                }
        }
}

static void armada_drm_crtc_atomic_enable(struct drm_crtc *crtc,
                                          struct drm_atomic_state *state)
{
        struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state,
                                                                         crtc);
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);

        DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);

        if (!old_state->active) {
                /*
                 * This modeset is enabling the CRTC after it having
                 * been disabled.  Reverse the call to ->disable in
                 * the atomic_disable().
                 */
                if (dcrtc->variant->enable)
                        dcrtc->variant->enable(dcrtc, &crtc->state->adjusted_mode);
        }
        armada_drm_crtc_update(dcrtc, true);
        drm_crtc_vblank_on(crtc);

        if (crtc->state->adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                WARN_ON(drm_crtc_vblank_get(crtc));

        armada_drm_crtc_queue_state_event(crtc);
}

static const struct drm_crtc_helper_funcs armada_crtc_helper_funcs = {
        .mode_valid     = armada_drm_crtc_mode_valid,
        .mode_fixup     = armada_drm_crtc_mode_fixup,
        .mode_set_nofb  = armada_drm_crtc_mode_set_nofb,
        .atomic_check   = armada_drm_crtc_atomic_check,
        .atomic_begin   = armada_drm_crtc_atomic_begin,
        .atomic_flush   = armada_drm_crtc_atomic_flush,
        .atomic_disable = armada_drm_crtc_atomic_disable,
        .atomic_enable  = armada_drm_crtc_atomic_enable,
};

static void armada_load_cursor_argb(void __iomem *base, uint32_t *pix,
        unsigned stride, unsigned width, unsigned height)
{
        uint32_t addr;
        unsigned y;

        addr = SRAM_HWC32_RAM1;
        for (y = 0; y < height; y++) {
                uint32_t *p = &pix[y * stride];
                unsigned x;

                for (x = 0; x < width; x++, p++) {
                        uint32_t val = *p;

                        /*
                         * In "ARGB888" (HWC32) mode, writing to the SRAM
                         * requires these bits to contain:
                         * 31:24 = alpha 23:16 = blue 15:8 = green 7:0 = red
                         * So, it's actually ABGR8888.  This is independent
                         * of the SWAPRB bits in DMA control register 0.
                         */
                        val = (val & 0xff00ff00) |
                              (val & 0x000000ff) << 16 |
                              (val & 0x00ff0000) >> 16;

                        writel_relaxed(val,
                                       base + LCD_SPU_SRAM_WRDAT);
                        writel_relaxed(addr | SRAM_WRITE,
                                       base + LCD_SPU_SRAM_CTRL);
                        readl_relaxed(base + LCD_SPU_HWC_OVSA_HPXL_VLN);
                        addr += 1;
                        if ((addr & 0x00ff) == 0)
                                addr += 0xf00;
                        if ((addr & 0x30ff) == 0)
                                addr = SRAM_HWC32_RAM2;
                }
        }
}

static void armada_drm_crtc_cursor_tran(void __iomem *base)
{
        unsigned addr;

        for (addr = 0; addr < 256; addr++) {
                /* write the default value */
                writel_relaxed(0x55555555, base + LCD_SPU_SRAM_WRDAT);
                writel_relaxed(addr | SRAM_WRITE | SRAM_HWC32_TRAN,
                               base + LCD_SPU_SRAM_CTRL);
        }
}

static int armada_drm_crtc_cursor_update(struct armada_crtc *dcrtc, bool reload)
{
        uint32_t xoff, xscr, w = dcrtc->cursor_w, s;
        uint32_t yoff, yscr, h = dcrtc->cursor_h;
        uint32_t para1;

        /*
         * Calculate the visible width and height of the cursor,
         * screen position, and the position in the cursor bitmap.
         */
        if (dcrtc->cursor_x < 0) {
                xoff = -dcrtc->cursor_x;
                xscr = 0;
                w -= min(xoff, w);
        } else if (dcrtc->cursor_x + w > dcrtc->crtc.mode.hdisplay) {
                xoff = 0;
                xscr = dcrtc->cursor_x;
                w = max_t(int, dcrtc->crtc.mode.hdisplay - dcrtc->cursor_x, 0);
        } else {
                xoff = 0;
                xscr = dcrtc->cursor_x;
        }

        if (dcrtc->cursor_y < 0) {
                yoff = -dcrtc->cursor_y;
                yscr = 0;
                h -= min(yoff, h);
        } else if (dcrtc->cursor_y + h > dcrtc->crtc.mode.vdisplay) {
                yoff = 0;
                yscr = dcrtc->cursor_y;
                h = max_t(int, dcrtc->crtc.mode.vdisplay - dcrtc->cursor_y, 0);
        } else {
                yoff = 0;
                yscr = dcrtc->cursor_y;
        }

        /* On interlaced modes, the vertical cursor size must be halved */
        s = dcrtc->cursor_w;
        if (dcrtc->interlaced) {
                s *= 2;
                yscr /= 2;
                h /= 2;
        }

        if (!dcrtc->cursor_obj || !h || !w) {
                spin_lock_irq(&dcrtc->irq_lock);
                dcrtc->cursor_update = false;
                armada_updatel(0, CFG_HWC_ENA, dcrtc->base + LCD_SPU_DMA_CTRL0);
                spin_unlock_irq(&dcrtc->irq_lock);
                return 0;
        }

        spin_lock_irq(&dcrtc->irq_lock);
        para1 = readl_relaxed(dcrtc->base + LCD_SPU_SRAM_PARA1);
        armada_updatel(CFG_CSB_256x32, CFG_CSB_256x32 | CFG_PDWN256x32,
                       dcrtc->base + LCD_SPU_SRAM_PARA1);
        spin_unlock_irq(&dcrtc->irq_lock);

        /*
         * Initialize the transparency if the SRAM was powered down.
         * We must also reload the cursor data as well.
         */
        if (!(para1 & CFG_CSB_256x32)) {
                armada_drm_crtc_cursor_tran(dcrtc->base);
                reload = true;
        }

        if (dcrtc->cursor_hw_sz != (h << 16 | w)) {
                spin_lock_irq(&dcrtc->irq_lock);
                dcrtc->cursor_update = false;
                armada_updatel(0, CFG_HWC_ENA, dcrtc->base + LCD_SPU_DMA_CTRL0);
                spin_unlock_irq(&dcrtc->irq_lock);
                reload = true;
        }
        if (reload) {
                struct armada_gem_object *obj = dcrtc->cursor_obj;
                uint32_t *pix;
                /* Set the top-left corner of the cursor image */
                pix = obj->addr;
                pix += yoff * s + xoff;
                armada_load_cursor_argb(dcrtc->base, pix, s, w, h);
        }

        /* Reload the cursor position, size and enable in the IRQ handler */
        spin_lock_irq(&dcrtc->irq_lock);
        dcrtc->cursor_hw_pos = yscr << 16 | xscr;
        dcrtc->cursor_hw_sz = h << 16 | w;
        dcrtc->cursor_update = true;
        armada_drm_crtc_enable_irq(dcrtc, DUMB_FRAMEDONE_ENA);
        spin_unlock_irq(&dcrtc->irq_lock);

        return 0;
}

static void cursor_update(void *data)
{
        armada_drm_crtc_cursor_update(data, true);
}

static int armada_drm_crtc_cursor_set(struct drm_crtc *crtc,
        struct drm_file *file, uint32_t handle, uint32_t w, uint32_t h)
{
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
        struct armada_gem_object *obj = NULL;
        int ret;

        /* If no cursor support, replicate drm's return value */
        if (!dcrtc->variant->has_spu_adv_reg)
                return -ENXIO;

        if (handle && w > 0 && h > 0) {
                /* maximum size is 64x32 or 32x64 */
                if (w > 64 || h > 64 || (w > 32 && h > 32))
                        return -ENOMEM;

                obj = armada_gem_object_lookup(file, handle);
                if (!obj)
                        return -ENOENT;

                /* Must be a kernel-mapped object */
                if (!obj->addr) {
                        drm_gem_object_put(&obj->obj);
                        return -EINVAL;
                }

                if (obj->obj.size < w * h * 4) {
                        DRM_ERROR("buffer is too small\n");
                        drm_gem_object_put(&obj->obj);
                        return -ENOMEM;
                }
        }

        if (dcrtc->cursor_obj) {
                dcrtc->cursor_obj->update = NULL;
                dcrtc->cursor_obj->update_data = NULL;
                drm_gem_object_put(&dcrtc->cursor_obj->obj);
        }
        dcrtc->cursor_obj = obj;
        dcrtc->cursor_w = w;
        dcrtc->cursor_h = h;
        ret = armada_drm_crtc_cursor_update(dcrtc, true);
        if (obj) {
                obj->update_data = dcrtc;
                obj->update = cursor_update;
        }

        return ret;
}

static int armada_drm_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
{
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
        int ret;

        /* If no cursor support, replicate drm's return value */
        if (!dcrtc->variant->has_spu_adv_reg)
                return -EFAULT;

        dcrtc->cursor_x = x;
        dcrtc->cursor_y = y;
        ret = armada_drm_crtc_cursor_update(dcrtc, false);

        return ret;
}

static void armada_drm_crtc_destroy(struct drm_crtc *crtc)
{
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
        struct armada_private *priv = drm_to_armada_dev(crtc->dev);

        if (dcrtc->cursor_obj)
                drm_gem_object_put(&dcrtc->cursor_obj->obj);

        priv->dcrtc[dcrtc->num] = NULL;
        drm_crtc_cleanup(&dcrtc->crtc);

        if (dcrtc->variant->disable)
                dcrtc->variant->disable(dcrtc);

        writel_relaxed(0, dcrtc->base + LCD_SPU_IRQ_ENA);

        of_node_put(dcrtc->crtc.port);

        kfree(dcrtc);
}

static int armada_drm_crtc_late_register(struct drm_crtc *crtc)
{
        if (IS_ENABLED(CONFIG_DEBUG_FS))
                armada_drm_crtc_debugfs_init(drm_to_armada_crtc(crtc));

        return 0;
}

/* These are called under the vbl_lock. */
static int armada_drm_crtc_enable_vblank(struct drm_crtc *crtc)
{
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
        unsigned long flags;

        spin_lock_irqsave(&dcrtc->irq_lock, flags);
        armada_drm_crtc_enable_irq(dcrtc, VSYNC_IRQ_ENA);
        spin_unlock_irqrestore(&dcrtc->irq_lock, flags);
        return 0;
}

static void armada_drm_crtc_disable_vblank(struct drm_crtc *crtc)
{
        struct armada_crtc *dcrtc = drm_to_armada_crtc(crtc);
        unsigned long flags;

        spin_lock_irqsave(&dcrtc->irq_lock, flags);
        armada_drm_crtc_disable_irq(dcrtc, VSYNC_IRQ_ENA);
        spin_unlock_irqrestore(&dcrtc->irq_lock, flags);
}

static const struct drm_crtc_funcs armada_crtc_funcs = {
        .reset          = drm_atomic_helper_crtc_reset,
        .cursor_set     = armada_drm_crtc_cursor_set,
        .cursor_move    = armada_drm_crtc_cursor_move,
        .destroy        = armada_drm_crtc_destroy,
        .set_config     = drm_atomic_helper_set_config,
        .page_flip      = drm_atomic_helper_page_flip,
        .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
        .late_register  = armada_drm_crtc_late_register,
        .enable_vblank  = armada_drm_crtc_enable_vblank,
        .disable_vblank = armada_drm_crtc_disable_vblank,
};

int armada_crtc_select_clock(struct armada_crtc *dcrtc,
                             struct armada_clk_result *res,
                             const struct armada_clocking_params *params,
                             struct clk *clks[], size_t num_clks,
                             unsigned long desired_khz)
{
        unsigned long desired_hz = desired_khz * 1000;
        unsigned long desired_clk_hz;   // requested clk input
        unsigned long real_clk_hz;      // actual clk input
        unsigned long real_hz;          // actual pixel clk
        unsigned long permillage;
        struct clk *clk;
        u32 div;
        int i;

        DRM_DEBUG_KMS("[CRTC:%u:%s] desired clock=%luHz\n",
                      dcrtc->crtc.base.id, dcrtc->crtc.name, desired_hz);

        for (i = 0; i < num_clks; i++) {
                clk = clks[i];
                if (!clk)
                        continue;

                if (params->settable & BIT(i)) {
                        real_clk_hz = clk_round_rate(clk, desired_hz);
                        desired_clk_hz = desired_hz;
                } else {
                        real_clk_hz = clk_get_rate(clk);
                        desired_clk_hz = real_clk_hz;
                }

                /* If the clock can do exactly the desired rate, we're done */
                if (real_clk_hz == desired_hz) {
                        real_hz = real_clk_hz;
                        div = 1;
                        goto found;
                }

                /* Calculate the divider - if invalid, we can't do this rate */
                div = DIV_ROUND_CLOSEST(real_clk_hz, desired_hz);
                if (div == 0 || div > params->div_max)
                        continue;

                /* Calculate the actual rate - HDMI requires -0.6%..+0.5% */
                real_hz = DIV_ROUND_CLOSEST(real_clk_hz, div);

                DRM_DEBUG_KMS("[CRTC:%u:%s] clk=%u %luHz div=%u real=%luHz\n",
                        dcrtc->crtc.base.id, dcrtc->crtc.name,
                        i, real_clk_hz, div, real_hz);

                /* Avoid repeated division */
                if (real_hz < desired_hz) {
                        permillage = real_hz / desired_khz;
                        if (permillage < params->permillage_min)
                                continue;
                } else {
                        permillage = DIV_ROUND_UP(real_hz, desired_khz);
                        if (permillage > params->permillage_max)
                                continue;
                }
                goto found;
        }

        return -ERANGE;

found:
        DRM_DEBUG_KMS("[CRTC:%u:%s] selected clk=%u %luHz div=%u real=%luHz\n",
                dcrtc->crtc.base.id, dcrtc->crtc.name,
                i, real_clk_hz, div, real_hz);

        res->desired_clk_hz = desired_clk_hz;
        res->clk = clk;
        res->div = div;

        return i;
}

static int armada_drm_crtc_create(struct drm_device *drm, struct device *dev,
        struct resource *res, int irq, const struct armada_variant *variant,
        struct device_node *port)
{
        struct armada_private *priv = drm_to_armada_dev(drm);
        struct armada_crtc *dcrtc;
        struct drm_plane *primary;
        void __iomem *base;
        int ret;

        base = devm_ioremap_resource(dev, res);
        if (IS_ERR(base))
                return PTR_ERR(base);

        dcrtc = kzalloc_obj(*dcrtc);
        if (!dcrtc) {
                DRM_ERROR("failed to allocate Armada crtc\n");
                return -ENOMEM;
        }

        if (dev != drm->dev)
                dev_set_drvdata(dev, dcrtc);

        dcrtc->variant = variant;
        dcrtc->base = base;
        dcrtc->num = drm->mode_config.num_crtc;
        dcrtc->cfg_dumb_ctrl = DUMB24_RGB888_0;
        dcrtc->spu_iopad_ctrl = CFG_VSCALE_LN_EN | CFG_IOPAD_DUMB24;
        spin_lock_init(&dcrtc->irq_lock);
        dcrtc->irq_ena = CLEAN_SPU_IRQ_ISR;

        /* Initialize some registers which we don't otherwise set */
        writel_relaxed(0x00000001, dcrtc->base + LCD_CFG_SCLK_DIV);
        writel_relaxed(0x00000000, dcrtc->base + LCD_SPU_BLANKCOLOR);
        writel_relaxed(dcrtc->spu_iopad_ctrl,
                       dcrtc->base + LCD_SPU_IOPAD_CONTROL);
        writel_relaxed(0x00000000, dcrtc->base + LCD_SPU_SRAM_PARA0);
        writel_relaxed(CFG_PDWN256x32 | CFG_PDWN256x24 | CFG_PDWN256x8 |
                       CFG_PDWN32x32 | CFG_PDWN16x66 | CFG_PDWN32x66 |
                       CFG_PDWN64x66, dcrtc->base + LCD_SPU_SRAM_PARA1);
        writel_relaxed(0x2032ff81, dcrtc->base + LCD_SPU_DMA_CTRL1);
        writel_relaxed(dcrtc->irq_ena, dcrtc->base + LCD_SPU_IRQ_ENA);
        readl_relaxed(dcrtc->base + LCD_SPU_IRQ_ISR);
        writel_relaxed(0, dcrtc->base + LCD_SPU_IRQ_ISR);

        ret = devm_request_irq(dev, irq, armada_drm_irq, 0, "armada_drm_crtc",
                               dcrtc);
        if (ret < 0)
                goto err_crtc;

        if (dcrtc->variant->init) {
                ret = dcrtc->variant->init(dcrtc, dev);
                if (ret)
                        goto err_crtc;
        }

        /* Ensure AXI pipeline is enabled */
        armada_updatel(CFG_ARBFAST_ENA, 0, dcrtc->base + LCD_SPU_DMA_CTRL0);

        priv->dcrtc[dcrtc->num] = dcrtc;

        dcrtc->crtc.port = port;

        primary = kzalloc_obj(*primary);
        if (!primary) {
                ret = -ENOMEM;
                goto err_crtc;
        }

        ret = armada_drm_primary_plane_init(drm, primary);
        if (ret) {
                kfree(primary);
                goto err_crtc;
        }

        ret = drm_crtc_init_with_planes(drm, &dcrtc->crtc, primary, NULL,
                                        &armada_crtc_funcs, NULL);
        if (ret)
                goto err_crtc_init;

        drm_crtc_helper_add(&dcrtc->crtc, &armada_crtc_helper_funcs);

        ret = drm_mode_crtc_set_gamma_size(&dcrtc->crtc, 256);
        if (ret)
                return ret;

        drm_crtc_enable_color_mgmt(&dcrtc->crtc, 0, false, 256);

        return armada_overlay_plane_create(drm, 1 << dcrtc->num);

err_crtc_init:
        primary->funcs->destroy(primary);
err_crtc:
        kfree(dcrtc);

        return ret;
}

static int
armada_lcd_bind(struct device *dev, struct device *master, void *data)
{
        struct platform_device *pdev = to_platform_device(dev);
        struct drm_device *drm = data;
        struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        int irq = platform_get_irq(pdev, 0);
        const struct armada_variant *variant;
        struct device_node *port = NULL;
        struct device_node *np, *parent = dev->of_node;

        if (irq < 0)
                return irq;


        variant = device_get_match_data(dev);
        if (!variant)
                return -ENXIO;

        if (parent) {
                np = of_get_child_by_name(parent, "ports");
                if (np)
                        parent = np;
                port = of_get_child_by_name(parent, "port");
                of_node_put(np);
                if (!port) {
                        dev_err(dev, "no port node found in %pOF\n", parent);
                        return -ENXIO;
                }
        }

        return armada_drm_crtc_create(drm, dev, res, irq, variant, port);
}

static void
armada_lcd_unbind(struct device *dev, struct device *master, void *data)
{
        struct armada_crtc *dcrtc = dev_get_drvdata(dev);

        armada_drm_crtc_destroy(&dcrtc->crtc);
}

static const struct component_ops armada_lcd_ops = {
        .bind = armada_lcd_bind,
        .unbind = armada_lcd_unbind,
};

static int armada_lcd_probe(struct platform_device *pdev)
{
        return component_add(&pdev->dev, &armada_lcd_ops);
}

static void armada_lcd_remove(struct platform_device *pdev)
{
        component_del(&pdev->dev, &armada_lcd_ops);
}

static const struct of_device_id armada_lcd_of_match[] = {
        {
                .compatible     = "marvell,dove-lcd",
                .data           = &armada510_ops,
        },
        {}
};
MODULE_DEVICE_TABLE(of, armada_lcd_of_match);

static const struct platform_device_id armada_lcd_platform_ids[] = {
        {
                .name           = "armada-lcd",
                .driver_data    = (unsigned long)&armada510_ops,
        }, {
                .name           = "armada-510-lcd",
                .driver_data    = (unsigned long)&armada510_ops,
        },
        { },
};
MODULE_DEVICE_TABLE(platform, armada_lcd_platform_ids);

struct platform_driver armada_lcd_platform_driver = {
        .probe  = armada_lcd_probe,
        .remove = armada_lcd_remove,
        .driver = {
                .name   = "armada-lcd",
                .owner  =  THIS_MODULE,
                .of_match_table = armada_lcd_of_match,
        },
        .id_table = armada_lcd_platform_ids,
};