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

   1 /*
   2  * Copyright (c) 2017 Lucas Stach, Pengutronix
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  */
  13
  14 #include <drm/drm_fourcc.h>
  15 #include <linux/clk.h>
  16 #include <linux/err.h>
  17 #include <linux/genalloc.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <video/imx-ipu-v3.h>
  22
  23 #include "ipu-prv.h"
  24
  25 #define IPU_PRE_MAX_WIDTH       2048
  26 #define IPU_PRE_NUM_SCANLINES   8
  27
  28 #define IPU_PRE_CTRL                                    0x000
  29 #define IPU_PRE_CTRL_SET                                0x004
  30 #define  IPU_PRE_CTRL_ENABLE                            (1 << 0)
  31 #define  IPU_PRE_CTRL_BLOCK_EN                          (1 << 1)
  32 #define  IPU_PRE_CTRL_BLOCK_16                          (1 << 2)
  33 #define  IPU_PRE_CTRL_SDW_UPDATE                        (1 << 4)
  34 #define  IPU_PRE_CTRL_VFLIP                             (1 << 5)
  35 #define  IPU_PRE_CTRL_SO                                (1 << 6)
  36 #define  IPU_PRE_CTRL_INTERLACED_FIELD                  (1 << 7)
  37 #define  IPU_PRE_CTRL_HANDSHAKE_EN                      (1 << 8)
  38 #define  IPU_PRE_CTRL_HANDSHAKE_LINE_NUM(v)             ((v & 0x3) << 9)
  39 #define  IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN           (1 << 11)
  40 #define  IPU_PRE_CTRL_EN_REPEAT                         (1 << 28)
  41 #define  IPU_PRE_CTRL_TPR_REST_SEL                      (1 << 29)
  42 #define  IPU_PRE_CTRL_CLKGATE                           (1 << 30)
  43 #define  IPU_PRE_CTRL_SFTRST                            (1 << 31)
  44
  45 #define IPU_PRE_CUR_BUF                                 0x030
  46
  47 #define IPU_PRE_NEXT_BUF                                0x040
  48
  49 #define IPU_PRE_TPR_CTRL                                0x070
  50 #define  IPU_PRE_TPR_CTRL_TILE_FORMAT(v)                ((v & 0xff) << 0)
  51 #define  IPU_PRE_TPR_CTRL_TILE_FORMAT_MASK              0xff
  52
  53 #define IPU_PRE_PREFETCH_ENG_CTRL                       0x080
  54 #define  IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN              (1 << 0)
  55 #define  IPU_PRE_PREF_ENG_CTRL_RD_NUM_BYTES(v)          ((v & 0x7) << 1)
  56 #define  IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(v)      ((v & 0x3) << 4)
  57 #define  IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(v)    ((v & 0x7) << 8)
  58 #define  IPU_PRE_PREF_ENG_CTRL_SHIFT_BYPASS             (1 << 11)
  59 #define  IPU_PRE_PREF_ENG_CTRL_FIELD_INVERSE            (1 << 12)
  60 #define  IPU_PRE_PREF_ENG_CTRL_PARTIAL_UV_SWAP          (1 << 14)
  61 #define  IPU_PRE_PREF_ENG_CTRL_TPR_COOR_OFFSET_EN       (1 << 15)
  62
  63 #define IPU_PRE_PREFETCH_ENG_INPUT_SIZE                 0x0a0
  64 #define  IPU_PRE_PREFETCH_ENG_INPUT_SIZE_WIDTH(v)       ((v & 0xffff) << 0)
  65 #define  IPU_PRE_PREFETCH_ENG_INPUT_SIZE_HEIGHT(v)      ((v & 0xffff) << 16)
  66
  67 #define IPU_PRE_PREFETCH_ENG_PITCH                      0x0d0
  68 #define  IPU_PRE_PREFETCH_ENG_PITCH_Y(v)                ((v & 0xffff) << 0)
  69 #define  IPU_PRE_PREFETCH_ENG_PITCH_UV(v)               ((v & 0xffff) << 16)
  70
  71 #define IPU_PRE_STORE_ENG_CTRL                          0x110
  72 #define  IPU_PRE_STORE_ENG_CTRL_STORE_EN                (1 << 0)
  73 #define  IPU_PRE_STORE_ENG_CTRL_WR_NUM_BYTES(v)         ((v & 0x7) << 1)
  74 #define  IPU_PRE_STORE_ENG_CTRL_OUTPUT_ACTIVE_BPP(v)    ((v & 0x3) << 4)
  75
  76 #define IPU_PRE_STORE_ENG_SIZE                          0x130
  77 #define  IPU_PRE_STORE_ENG_SIZE_INPUT_WIDTH(v)          ((v & 0xffff) << 0)
  78 #define  IPU_PRE_STORE_ENG_SIZE_INPUT_HEIGHT(v)         ((v & 0xffff) << 16)
  79
  80 #define IPU_PRE_STORE_ENG_PITCH                         0x140
  81 #define  IPU_PRE_STORE_ENG_PITCH_OUT_PITCH(v)           ((v & 0xffff) << 0)
  82
  83 #define IPU_PRE_STORE_ENG_ADDR                          0x150
  84
  85 struct ipu_pre {
  86         struct list_head        list;
  87         struct device           *dev;
  88
  89         void __iomem            *regs;
  90         struct clk              *clk_axi;
  91         struct gen_pool         *iram;
  92
  93         dma_addr_t              buffer_paddr;
  94         void                    *buffer_virt;
  95         bool                    in_use;
  96 };
  97
  98 static DEFINE_MUTEX(ipu_pre_list_mutex);
  99 static LIST_HEAD(ipu_pre_list);
 100 static int available_pres;
 101
 102 int ipu_pre_get_available_count(void)
 103 {
 104         return available_pres;
 105 }
 106
 107 struct ipu_pre *
 108 ipu_pre_lookup_by_phandle(struct device *dev, const char *name, int index)
 109 {
 110         struct device_node *pre_node = of_parse_phandle(dev->of_node,
 111                                                         name, index);
 112         struct ipu_pre *pre;
 113
 114         mutex_lock(&ipu_pre_list_mutex);
 115         list_for_each_entry(pre, &ipu_pre_list, list) {
 116                 if (pre_node == pre->dev->of_node) {
 117                         mutex_unlock(&ipu_pre_list_mutex);
 118                         device_link_add(dev, pre->dev, DL_FLAG_AUTOREMOVE);
 119                         return pre;
 120                 }
 121         }
 122         mutex_unlock(&ipu_pre_list_mutex);
 123
 124         return NULL;
 125 }
 126
 127 int ipu_pre_get(struct ipu_pre *pre)
 128 {
 129         u32 val;
 130
 131         if (pre->in_use)
 132                 return -EBUSY;
 133
 134         clk_prepare_enable(pre->clk_axi);
 135
 136         /* first get the engine out of reset and remove clock gating */
 137         writel(0, pre->regs + IPU_PRE_CTRL);
 138
 139         /* init defaults that should be applied to all streams */
 140         val = IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN |
 141               IPU_PRE_CTRL_HANDSHAKE_EN |
 142               IPU_PRE_CTRL_TPR_REST_SEL |
 143               IPU_PRE_CTRL_BLOCK_16 | IPU_PRE_CTRL_SDW_UPDATE;
 144         writel(val, pre->regs + IPU_PRE_CTRL);
 145
 146         pre->in_use = true;
 147         return 0;
 148 }
 149
 150 void ipu_pre_put(struct ipu_pre *pre)
 151 {
 152         u32 val;
 153
 154         val = IPU_PRE_CTRL_SFTRST | IPU_PRE_CTRL_CLKGATE;
 155         writel(val, pre->regs + IPU_PRE_CTRL);
 156
 157         clk_disable_unprepare(pre->clk_axi);
 158
 159         pre->in_use = false;
 160 }
 161
 162 void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
 163                        unsigned int height, unsigned int stride, u32 format,
 164                        unsigned int bufaddr)
 165 {
 166         const struct drm_format_info *info = drm_format_info(format);
 167         u32 active_bpp = info->cpp[0] >> 1;
 168         u32 val;
 169
 170         writel(bufaddr, pre->regs + IPU_PRE_CUR_BUF);
 171         writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
 172
 173         val = IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(0) |
 174               IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(active_bpp) |
 175               IPU_PRE_PREF_ENG_CTRL_RD_NUM_BYTES(4) |
 176               IPU_PRE_PREF_ENG_CTRL_SHIFT_BYPASS |
 177               IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN;
 178         writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_CTRL);
 179
 180         val = IPU_PRE_PREFETCH_ENG_INPUT_SIZE_WIDTH(width) |
 181               IPU_PRE_PREFETCH_ENG_INPUT_SIZE_HEIGHT(height);
 182         writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_INPUT_SIZE);
 183
 184         val = IPU_PRE_PREFETCH_ENG_PITCH_Y(stride);
 185         writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_PITCH);
 186
 187         val = IPU_PRE_STORE_ENG_CTRL_OUTPUT_ACTIVE_BPP(active_bpp) |
 188               IPU_PRE_STORE_ENG_CTRL_WR_NUM_BYTES(4) |
 189               IPU_PRE_STORE_ENG_CTRL_STORE_EN;
 190         writel(val, pre->regs + IPU_PRE_STORE_ENG_CTRL);
 191
 192         val = IPU_PRE_STORE_ENG_SIZE_INPUT_WIDTH(width) |
 193               IPU_PRE_STORE_ENG_SIZE_INPUT_HEIGHT(height);
 194         writel(val, pre->regs + IPU_PRE_STORE_ENG_SIZE);
 195
 196         val = IPU_PRE_STORE_ENG_PITCH_OUT_PITCH(stride);
 197         writel(val, pre->regs + IPU_PRE_STORE_ENG_PITCH);
 198
 199         writel(pre->buffer_paddr, pre->regs + IPU_PRE_STORE_ENG_ADDR);
 200
 201         val = readl(pre->regs + IPU_PRE_CTRL);
 202         val |= IPU_PRE_CTRL_EN_REPEAT | IPU_PRE_CTRL_ENABLE |
 203                IPU_PRE_CTRL_SDW_UPDATE;
 204         writel(val, pre->regs + IPU_PRE_CTRL);
 205 }
 206
 207 void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr)
 208 {
 209         writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
 210         writel(IPU_PRE_CTRL_SDW_UPDATE, pre->regs + IPU_PRE_CTRL_SET);
 211 }
 212
 213 u32 ipu_pre_get_baddr(struct ipu_pre *pre)
 214 {
 215         return (u32)pre->buffer_paddr;
 216 }
 217
 218 static int ipu_pre_probe(struct platform_device *pdev)
 219 {
 220         struct device *dev = &pdev->dev;
 221         struct resource *res;
 222         struct ipu_pre *pre;
 223
 224         pre = devm_kzalloc(dev, sizeof(*pre), GFP_KERNEL);
 225         if (!pre)
 226                 return -ENOMEM;
 227
 228         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 229         pre->regs = devm_ioremap_resource(&pdev->dev, res);
 230         if (IS_ERR(pre->regs))
 231                 return PTR_ERR(pre->regs);
 232
 233         pre->clk_axi = devm_clk_get(dev, "axi");
 234         if (IS_ERR(pre->clk_axi))
 235                 return PTR_ERR(pre->clk_axi);
 236
 237         pre->iram = of_gen_pool_get(dev->of_node, "fsl,iram", 0);
 238         if (!pre->iram)
 239                 return -EPROBE_DEFER;
 240
 241         /*
 242          * Allocate IRAM buffer with maximum size. This could be made dynamic,
 243          * but as there is no other user of this IRAM region and we can fit all
 244          * max sized buffers into it, there is no need yet.
 245          */
 246         pre->buffer_virt = gen_pool_dma_alloc(pre->iram, IPU_PRE_MAX_WIDTH *
 247                                               IPU_PRE_NUM_SCANLINES * 4,
 248                                               &pre->buffer_paddr);
 249         if (!pre->buffer_virt)
 250                 return -ENOMEM;
 251
 252         pre->dev = dev;
 253         platform_set_drvdata(pdev, pre);
 254         mutex_lock(&ipu_pre_list_mutex);
 255         list_add(&pre->list, &ipu_pre_list);
 256         available_pres++;
 257         mutex_unlock(&ipu_pre_list_mutex);
 258
 259         return 0;
 260 }
 261
 262 static int ipu_pre_remove(struct platform_device *pdev)
 263 {
 264         struct ipu_pre *pre = platform_get_drvdata(pdev);
 265
 266         mutex_lock(&ipu_pre_list_mutex);
 267         list_del(&pre->list);
 268         available_pres--;
 269         mutex_unlock(&ipu_pre_list_mutex);
 270
 271         if (pre->buffer_virt)
 272                 gen_pool_free(pre->iram, (unsigned long)pre->buffer_virt,
 273                               IPU_PRE_MAX_WIDTH * IPU_PRE_NUM_SCANLINES * 4);
 274         return 0;
 275 }
 276
 277 static const struct of_device_id ipu_pre_dt_ids[] = {
 278         { .compatible = "fsl,imx6qp-pre", },
 279         { /* sentinel */ },
 280 };
 281
 282 struct platform_driver ipu_pre_drv = {
 283         .probe          = ipu_pre_probe,
 284         .remove         = ipu_pre_remove,
 285         .driver         = {
 286                 .name   = "imx-ipu-pre",
 287                 .of_match_table = ipu_pre_dt_ids,
 288         },
 289 };