ipu-dp.c

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/*
 * Copyright (c) 2010 Sascha Hauer <[email protected]>
 * Copyright (C) 2005-2009 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * 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.
 */
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/err.h>

#include "imx-ipu-v3.h"
#include "ipu-prv.h"

#define DP_SYNC 0
#define DP_ASYNC0 0x60
#define DP_ASYNC1 0xBC

#define DP_COM_CONF     0x0
#define DP_GRAPH_WIND_CTRL  0x0004
#define DP_FG_POS       0x0008
#define DP_CSC_A_0      0x0044
#define DP_CSC_A_1      0x0048
#define DP_CSC_A_2      0x004C
#define DP_CSC_A_3      0x0050
#define DP_CSC_0        0x0054
#define DP_CSC_1        0x0058

#define DP_COM_CONF_FG_EN       (1 << 0)
#define DP_COM_CONF_GWSEL       (1 << 1)
#define DP_COM_CONF_GWAM        (1 << 2)
#define DP_COM_CONF_GWCKE       (1 << 3)
#define DP_COM_CONF_CSC_DEF_MASK    (3 << 8)
#define DP_COM_CONF_CSC_DEF_OFFSET  8
#define DP_COM_CONF_CSC_DEF_FG      (3 << 8)
#define DP_COM_CONF_CSC_DEF_BG      (2 << 8)
#define DP_COM_CONF_CSC_DEF_BOTH    (1 << 8)

struct ipu_dp_priv;

struct ipu_dp {
    u32 flow;
    bool in_use;
    bool foreground;
    enum ipu_color_space in_cs;
};

struct ipu_flow {
    struct ipu_dp foreground;
    struct ipu_dp background;
    enum ipu_color_space out_cs;
    void __iomem *base;
    struct ipu_dp_priv *priv;
};

struct ipu_dp_priv {
    struct ipu_soc *ipu;
    struct device *dev;
    void __iomem *base;
    struct ipu_flow flow[3];
    struct mutex mutex;
    int use_count;
};

static u32 ipu_dp_flow_base[] = {DP_SYNC, DP_ASYNC0, DP_ASYNC1};

static inline struct ipu_flow *to_flow(struct ipu_dp *dp)
{
    if (dp->foreground)
        return container_of(dp, struct ipu_flow, foreground);
    else
        return container_of(dp, struct ipu_flow, background);
}

int ipu_dp_set_global_alpha(struct ipu_dp *dp, bool enable,
        u8 alpha, bool bg_chan)
{
    struct ipu_flow *flow = to_flow(dp);
    struct ipu_dp_priv *priv = flow->priv;
    u32 reg;

    mutex_lock(&priv->mutex);

    reg = readl(flow->base + DP_COM_CONF);
    if (bg_chan)
        reg &= ~DP_COM_CONF_GWSEL;
    else
        reg |= DP_COM_CONF_GWSEL;
    writel(reg, flow->base + DP_COM_CONF);

    if (enable) {
        reg = readl(flow->base + DP_GRAPH_WIND_CTRL) & 0x00FFFFFFL;
        writel(reg | ((u32) alpha << 24),
                 flow->base + DP_GRAPH_WIND_CTRL);

        reg = readl(flow->base + DP_COM_CONF);
        writel(reg | DP_COM_CONF_GWAM, flow->base + DP_COM_CONF);
    } else {
        reg = readl(flow->base + DP_COM_CONF);
        writel(reg & ~DP_COM_CONF_GWAM, flow->base + DP_COM_CONF);
    }

    ipu_srm_dp_sync_update(priv->ipu);

    mutex_unlock(&priv->mutex);

    return 0;
}
EXPORT_SYMBOL_GPL(ipu_dp_set_global_alpha);

int ipu_dp_set_window_pos(struct ipu_dp *dp, u16 x_pos, u16 y_pos)
{
    struct ipu_flow *flow = to_flow(dp);
    struct ipu_dp_priv *priv = flow->priv;

    writel((x_pos << 16) | y_pos, flow->base + DP_FG_POS);

    ipu_srm_dp_sync_update(priv->ipu);

    return 0;
}
EXPORT_SYMBOL_GPL(ipu_dp_set_window_pos);

static void ipu_dp_csc_init(struct ipu_flow *flow,
        enum ipu_color_space in,
        enum ipu_color_space out,
        u32 place)
{
    u32 reg;

    reg = readl(flow->base + DP_COM_CONF);
    reg &= ~DP_COM_CONF_CSC_DEF_MASK;

    if (in == out) {
        writel(reg, flow->base + DP_COM_CONF);
        return;
    }

    if (in == IPUV3_COLORSPACE_RGB && out == IPUV3_COLORSPACE_YUV) {
        writel(0x099 | (0x12d << 16), flow->base + DP_CSC_A_0);
        writel(0x03a | (0x3a9 << 16), flow->base + DP_CSC_A_1);
        writel(0x356 | (0x100 << 16), flow->base + DP_CSC_A_2);
        writel(0x100 | (0x329 << 16), flow->base + DP_CSC_A_3);
        writel(0x3d6 | (0x0000 << 16) | (2 << 30),
                flow->base + DP_CSC_0);
        writel(0x200 | (2 << 14) | (0x200 << 16) | (2 << 30),
                flow->base + DP_CSC_1);
    } else {
        writel(0x095 | (0x000 << 16), flow->base + DP_CSC_A_0);
        writel(0x0cc | (0x095 << 16), flow->base + DP_CSC_A_1);
        writel(0x3ce | (0x398 << 16), flow->base + DP_CSC_A_2);
        writel(0x095 | (0x0ff << 16), flow->base + DP_CSC_A_3);
        writel(0x000 | (0x3e42 << 16) | (1 << 30),
                flow->base + DP_CSC_0);
        writel(0x10a | (1 << 14) | (0x3dd6 << 16) | (1 << 30),
                flow->base + DP_CSC_1);
    }

    reg |= place;

    writel(reg, flow->base + DP_COM_CONF);
}

int ipu_dp_setup_channel(struct ipu_dp *dp,
        enum ipu_color_space in,
        enum ipu_color_space out)
{
    struct ipu_flow *flow = to_flow(dp);
    struct ipu_dp_priv *priv = flow->priv;

    mutex_lock(&priv->mutex);

    dp->in_cs = in;

    if (!dp->foreground)
        flow->out_cs = out;

    if (flow->foreground.in_cs == flow->background.in_cs) {
        /*
         * foreground and background are of same colorspace, put
         * colorspace converter after combining unit.
         */
        ipu_dp_csc_init(flow, flow->foreground.in_cs, flow->out_cs,
                DP_COM_CONF_CSC_DEF_BOTH);
    } else {
        if (flow->foreground.in_cs == flow->out_cs)
            /*
             * foreground identical to output, apply color
             * conversion on background
             */
            ipu_dp_csc_init(flow, flow->background.in_cs,
                    flow->out_cs, DP_COM_CONF_CSC_DEF_BG);
        else
            ipu_dp_csc_init(flow, flow->foreground.in_cs,
                    flow->out_cs, DP_COM_CONF_CSC_DEF_FG);
    }

    ipu_srm_dp_sync_update(priv->ipu);

    mutex_unlock(&priv->mutex);

    return 0;
}
EXPORT_SYMBOL_GPL(ipu_dp_setup_channel);

int ipu_dp_enable_channel(struct ipu_dp *dp)
{
    struct ipu_flow *flow = to_flow(dp);
    struct ipu_dp_priv *priv = flow->priv;

    mutex_lock(&priv->mutex);

    if (!priv->use_count)
        ipu_module_enable(priv->ipu, IPU_CONF_DP_EN);

    priv->use_count++;

    if (dp->foreground) {
        u32 reg;

        reg = readl(flow->base + DP_COM_CONF);
        reg |= DP_COM_CONF_FG_EN;
        writel(reg, flow->base + DP_COM_CONF);

        ipu_srm_dp_sync_update(priv->ipu);
    }

    mutex_unlock(&priv->mutex);

    return 0;
}
EXPORT_SYMBOL_GPL(ipu_dp_enable_channel);

void ipu_dp_disable_channel(struct ipu_dp *dp)
{
    struct ipu_flow *flow = to_flow(dp);
    struct ipu_dp_priv *priv = flow->priv;

    mutex_lock(&priv->mutex);

    priv->use_count--;

    if (dp->foreground) {
        u32 reg, csc;

        reg = readl(flow->base + DP_COM_CONF);
        csc = reg & DP_COM_CONF_CSC_DEF_MASK;
        if (csc == DP_COM_CONF_CSC_DEF_FG)
            reg &= ~DP_COM_CONF_CSC_DEF_MASK;

        reg &= ~DP_COM_CONF_FG_EN;
        writel(reg, flow->base + DP_COM_CONF);

        writel(0, flow->base + DP_FG_POS);
        ipu_srm_dp_sync_update(priv->ipu);
    }

    if (!priv->use_count)
        ipu_module_disable(priv->ipu, IPU_CONF_DP_EN);

    if (priv->use_count < 0)
        priv->use_count = 0;

    mutex_unlock(&priv->mutex);
}
EXPORT_SYMBOL_GPL(ipu_dp_disable_channel);

struct ipu_dp *ipu_dp_get(struct ipu_soc *ipu, unsigned int flow)
{
    struct ipu_dp_priv *priv = ipu->dp_priv;
    struct ipu_dp *dp;

    if (flow > 5)
        return ERR_PTR(-EINVAL);

    if (flow & 1)
        dp = &priv->flow[flow >> 1].foreground;
    else
        dp = &priv->flow[flow >> 1].background;

    if (dp->in_use)
        return ERR_PTR(-EBUSY);

    dp->in_use = true;

    return dp;
}
EXPORT_SYMBOL_GPL(ipu_dp_get);

void ipu_dp_put(struct ipu_dp *dp)
{
    dp->in_use = false;
}
EXPORT_SYMBOL_GPL(ipu_dp_put);

int ipu_dp_init(struct ipu_soc *ipu, struct device *dev, unsigned long base)
{
    struct ipu_dp_priv *priv;
    int i;

    priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
    priv->dev = dev;
    priv->ipu = ipu;

    ipu->dp_priv = priv;

    priv->base = devm_ioremap(dev, base, PAGE_SIZE);
    if (!priv->base) {
        kfree(priv);
        return -ENOMEM;
    }

    mutex_init(&priv->mutex);

    for (i = 0; i < 3; i++) {
        priv->flow[i].foreground.foreground = 1;
        priv->flow[i].base = priv->base + ipu_dp_flow_base[i];
        priv->flow[i].priv = priv;
    }

    return 0;
}

void ipu_dp_exit(struct ipu_soc *ipu)
{
}