drivers/gpu/ipu-v3/ipu-dmfc.c

   1 /*
   2  * Copyright (c) 2010 Sascha Hauer <s.hauer@pengutronix.de>
   3  * Copyright (C) 2005-2009 Freescale Semiconductor, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15 #include <linux/export.h>
  16 #include <linux/types.h>
  17 #include <linux/errno.h>
  18 #include <linux/io.h>
  19
  20 #include <video/imx-ipu-v3.h>
  21 #include "ipu-prv.h"
  22
  23 #define DMFC_RD_CHAN            0x0000
  24 #define DMFC_WR_CHAN            0x0004
  25 #define DMFC_WR_CHAN_DEF        0x0008
  26 #define DMFC_DP_CHAN            0x000c
  27 #define DMFC_DP_CHAN_DEF        0x0010
  28 #define DMFC_GENERAL1           0x0014
  29 #define DMFC_GENERAL2           0x0018
  30 #define DMFC_IC_CTRL            0x001c
  31 #define DMFC_WR_CHAN_ALT        0x0020
  32 #define DMFC_WR_CHAN_DEF_ALT    0x0024
  33 #define DMFC_DP_CHAN_ALT        0x0028
  34 #define DMFC_DP_CHAN_DEF_ALT    0x002c
  35 #define DMFC_GENERAL1_ALT       0x0030
  36 #define DMFC_STAT               0x0034
  37
  38 #define DMFC_WR_CHAN_1_28               0
  39 #define DMFC_WR_CHAN_2_41               8
  40 #define DMFC_WR_CHAN_1C_42              16
  41 #define DMFC_WR_CHAN_2C_43              24
  42
  43 #define DMFC_DP_CHAN_5B_23              0
  44 #define DMFC_DP_CHAN_5F_27              8
  45 #define DMFC_DP_CHAN_6B_24              16
  46 #define DMFC_DP_CHAN_6F_29              24
  47
  48 struct dmfc_channel_data {
  49         int             ipu_channel;
  50         unsigned long   channel_reg;
  51         unsigned long   shift;
  52         unsigned        eot_shift;
  53         unsigned        max_fifo_lines;
  54 };
  55
  56 static const struct dmfc_channel_data dmfcdata[] = {
  57         {
  58                 .ipu_channel    = IPUV3_CHANNEL_MEM_BG_SYNC,
  59                 .channel_reg    = DMFC_DP_CHAN,
  60                 .shift          = DMFC_DP_CHAN_5B_23,
  61                 .eot_shift      = 20,
  62                 .max_fifo_lines = 3,
  63         }, {
  64                 .ipu_channel    = 24,
  65                 .channel_reg    = DMFC_DP_CHAN,
  66                 .shift          = DMFC_DP_CHAN_6B_24,
  67                 .eot_shift      = 22,
  68                 .max_fifo_lines = 1,
  69         }, {
  70                 .ipu_channel    = IPUV3_CHANNEL_MEM_FG_SYNC,
  71                 .channel_reg    = DMFC_DP_CHAN,
  72                 .shift          = DMFC_DP_CHAN_5F_27,
  73                 .eot_shift      = 21,
  74                 .max_fifo_lines = 2,
  75         }, {
  76                 .ipu_channel    = IPUV3_CHANNEL_MEM_DC_SYNC,
  77                 .channel_reg    = DMFC_WR_CHAN,
  78                 .shift          = DMFC_WR_CHAN_1_28,
  79                 .eot_shift      = 16,
  80                 .max_fifo_lines = 2,
  81         }, {
  82                 .ipu_channel    = 29,
  83                 .channel_reg    = DMFC_DP_CHAN,
  84                 .shift          = DMFC_DP_CHAN_6F_29,
  85                 .eot_shift      = 23,
  86                 .max_fifo_lines = 1,
  87         },
  88 };
  89
  90 #define DMFC_NUM_CHANNELS       ARRAY_SIZE(dmfcdata)
  91
  92 struct ipu_dmfc_priv;
  93
  94 struct dmfc_channel {
  95         unsigned                        slots;
  96         struct ipu_soc                  *ipu;
  97         struct ipu_dmfc_priv            *priv;
  98         const struct dmfc_channel_data  *data;
  99 };
 100
 101 struct ipu_dmfc_priv {
 102         struct ipu_soc *ipu;
 103         struct device *dev;
 104         struct dmfc_channel channels[DMFC_NUM_CHANNELS];
 105         struct mutex mutex;
 106         void __iomem *base;
 107         int use_count;
 108 };
 109
 110 int ipu_dmfc_enable_channel(struct dmfc_channel *dmfc)
 111 {
 112         struct ipu_dmfc_priv *priv = dmfc->priv;
 113         mutex_lock(&priv->mutex);
 114
 115         if (!priv->use_count)
 116                 ipu_module_enable(priv->ipu, IPU_CONF_DMFC_EN);
 117
 118         priv->use_count++;
 119
 120         mutex_unlock(&priv->mutex);
 121
 122         return 0;
 123 }
 124 EXPORT_SYMBOL_GPL(ipu_dmfc_enable_channel);
 125
 126 void ipu_dmfc_disable_channel(struct dmfc_channel *dmfc)
 127 {
 128         struct ipu_dmfc_priv *priv = dmfc->priv;
 129
 130         mutex_lock(&priv->mutex);
 131
 132         priv->use_count--;
 133
 134         if (!priv->use_count)
 135                 ipu_module_disable(priv->ipu, IPU_CONF_DMFC_EN);
 136
 137         if (priv->use_count < 0)
 138                 priv->use_count = 0;
 139
 140         mutex_unlock(&priv->mutex);
 141 }
 142 EXPORT_SYMBOL_GPL(ipu_dmfc_disable_channel);
 143
 144 void ipu_dmfc_config_wait4eot(struct dmfc_channel *dmfc, int width)
 145 {
 146         struct ipu_dmfc_priv *priv = dmfc->priv;
 147         u32 dmfc_gen1;
 148
 149         mutex_lock(&priv->mutex);
 150
 151         dmfc_gen1 = readl(priv->base + DMFC_GENERAL1);
 152
 153         if ((dmfc->slots * 64 * 4) / width > dmfc->data->max_fifo_lines)
 154                 dmfc_gen1 |= 1 << dmfc->data->eot_shift;
 155         else
 156                 dmfc_gen1 &= ~(1 << dmfc->data->eot_shift);
 157
 158         writel(dmfc_gen1, priv->base + DMFC_GENERAL1);
 159
 160         mutex_unlock(&priv->mutex);
 161 }
 162 EXPORT_SYMBOL_GPL(ipu_dmfc_config_wait4eot);
 163
 164 struct dmfc_channel *ipu_dmfc_get(struct ipu_soc *ipu, int ipu_channel)
 165 {
 166         struct ipu_dmfc_priv *priv = ipu->dmfc_priv;
 167         int i;
 168
 169         for (i = 0; i < DMFC_NUM_CHANNELS; i++)
 170                 if (dmfcdata[i].ipu_channel == ipu_channel)
 171                         return &priv->channels[i];
 172         return ERR_PTR(-ENODEV);
 173 }
 174 EXPORT_SYMBOL_GPL(ipu_dmfc_get);
 175
 176 void ipu_dmfc_put(struct dmfc_channel *dmfc)
 177 {
 178 }
 179 EXPORT_SYMBOL_GPL(ipu_dmfc_put);
 180
 181 int ipu_dmfc_init(struct ipu_soc *ipu, struct device *dev, unsigned long base,
 182                 struct clk *ipu_clk)
 183 {
 184         struct ipu_dmfc_priv *priv;
 185         int i;
 186
 187         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 188         if (!priv)
 189                 return -ENOMEM;
 190
 191         priv->base = devm_ioremap(dev, base, PAGE_SIZE);
 192         if (!priv->base)
 193                 return -ENOMEM;
 194
 195         priv->dev = dev;
 196         priv->ipu = ipu;
 197         mutex_init(&priv->mutex);
 198
 199         ipu->dmfc_priv = priv;
 200
 201         for (i = 0; i < DMFC_NUM_CHANNELS; i++) {
 202                 priv->channels[i].priv = priv;
 203                 priv->channels[i].ipu = ipu;
 204                 priv->channels[i].data = &dmfcdata[i];
 205
 206                 if (dmfcdata[i].ipu_channel == IPUV3_CHANNEL_MEM_BG_SYNC ||
 207                     dmfcdata[i].ipu_channel == IPUV3_CHANNEL_MEM_FG_SYNC ||
 208                     dmfcdata[i].ipu_channel == IPUV3_CHANNEL_MEM_DC_SYNC)
 209                         priv->channels[i].slots = 2;
 210         }
 211
 212         writel(0x00000050, priv->base + DMFC_WR_CHAN);
 213         writel(0x00005654, priv->base + DMFC_DP_CHAN);
 214         writel(0x202020f6, priv->base + DMFC_WR_CHAN_DEF);
 215         writel(0x2020f6f6, priv->base + DMFC_DP_CHAN_DEF);
 216         writel(0x00000003, priv->base + DMFC_GENERAL1);
 217
 218         return 0;
 219 }
 220
 221 void ipu_dmfc_exit(struct ipu_soc *ipu)
 222 {
 223 }