drivers/soc/amlogic/meson-canvas.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 BayLibre, SAS
   4  * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
   5  * Copyright (C) 2014 Endless Mobile
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/mfd/syscon.h>
  10 #include <linux/module.h>
  11 #include <linux/regmap.h>
  12 #include <linux/soc/amlogic/meson-canvas.h>
  13 #include <linux/of_address.h>
  14 #include <linux/of_platform.h>
  15 #include <linux/io.h>
  16
  17 #define NUM_CANVAS 256
  18
  19 /* DMC Registers */
  20 #define DMC_CAV_LUT_DATAL       0x00
  21         #define CANVAS_WIDTH_LBIT       29
  22         #define CANVAS_WIDTH_LWID       3
  23 #define DMC_CAV_LUT_DATAH       0x04
  24         #define CANVAS_WIDTH_HBIT       0
  25         #define CANVAS_HEIGHT_BIT       9
  26         #define CANVAS_WRAP_BIT         22
  27         #define CANVAS_BLKMODE_BIT      24
  28         #define CANVAS_ENDIAN_BIT       26
  29 #define DMC_CAV_LUT_ADDR        0x08
  30         #define CANVAS_LUT_WR_EN        BIT(9)
  31         #define CANVAS_LUT_RD_EN        BIT(8)
  32
  33 struct meson_canvas {
  34         struct device *dev;
  35         void __iomem *reg_base;
  36         spinlock_t lock; /* canvas device lock */
  37         u8 used[NUM_CANVAS];
  38 };
  39
  40 static void canvas_write(struct meson_canvas *canvas, u32 reg, u32 val)
  41 {
  42         writel_relaxed(val, canvas->reg_base + reg);
  43 }
  44
  45 static u32 canvas_read(struct meson_canvas *canvas, u32 reg)
  46 {
  47         return readl_relaxed(canvas->reg_base + reg);
  48 }
  49
  50 struct meson_canvas *meson_canvas_get(struct device *dev)
  51 {
  52         struct device_node *canvas_node;
  53         struct platform_device *canvas_pdev;
  54
  55         canvas_node = of_parse_phandle(dev->of_node, "amlogic,canvas", 0);
  56         if (!canvas_node)
  57                 return ERR_PTR(-ENODEV);
  58
  59         canvas_pdev = of_find_device_by_node(canvas_node);
  60         if (!canvas_pdev)
  61                 return ERR_PTR(-EPROBE_DEFER);
  62
  63         return dev_get_drvdata(&canvas_pdev->dev);
  64 }
  65 EXPORT_SYMBOL_GPL(meson_canvas_get);
  66
  67 int meson_canvas_config(struct meson_canvas *canvas, u8 canvas_index,
  68                         u32 addr, u32 stride, u32 height,
  69                         unsigned int wrap,
  70                         unsigned int blkmode,
  71                         unsigned int endian)
  72 {
  73         unsigned long flags;
  74
  75         spin_lock_irqsave(&canvas->lock, flags);
  76         if (!canvas->used[canvas_index]) {
  77                 dev_err(canvas->dev,
  78                         "Trying to setup non allocated canvas %u\n",
  79                         canvas_index);
  80                 spin_unlock_irqrestore(&canvas->lock, flags);
  81                 return -EINVAL;
  82         }
  83
  84         canvas_write(canvas, DMC_CAV_LUT_DATAL,
  85                      ((addr + 7) >> 3) |
  86                      (((stride + 7) >> 3) << CANVAS_WIDTH_LBIT));
  87
  88         canvas_write(canvas, DMC_CAV_LUT_DATAH,
  89                      ((((stride + 7) >> 3) >> CANVAS_WIDTH_LWID) <<
  90                                                 CANVAS_WIDTH_HBIT) |
  91                      (height << CANVAS_HEIGHT_BIT) |
  92                      (wrap << CANVAS_WRAP_BIT) |
  93                      (blkmode << CANVAS_BLKMODE_BIT) |
  94                      (endian << CANVAS_ENDIAN_BIT));
  95
  96         canvas_write(canvas, DMC_CAV_LUT_ADDR,
  97                      CANVAS_LUT_WR_EN | canvas_index);
  98
  99         /* Force a read-back to make sure everything is flushed. */
 100         canvas_read(canvas, DMC_CAV_LUT_DATAH);
 101         spin_unlock_irqrestore(&canvas->lock, flags);
 102
 103         return 0;
 104 }
 105 EXPORT_SYMBOL_GPL(meson_canvas_config);
 106
 107 int meson_canvas_alloc(struct meson_canvas *canvas, u8 *canvas_index)
 108 {
 109         int i;
 110         unsigned long flags;
 111
 112         spin_lock_irqsave(&canvas->lock, flags);
 113         for (i = 0; i < NUM_CANVAS; ++i) {
 114                 if (!canvas->used[i]) {
 115                         canvas->used[i] = 1;
 116                         spin_unlock_irqrestore(&canvas->lock, flags);
 117                         *canvas_index = i;
 118                         return 0;
 119                 }
 120         }
 121         spin_unlock_irqrestore(&canvas->lock, flags);
 122
 123         dev_err(canvas->dev, "No more canvas available\n");
 124         return -ENODEV;
 125 }
 126 EXPORT_SYMBOL_GPL(meson_canvas_alloc);
 127
 128 int meson_canvas_free(struct meson_canvas *canvas, u8 canvas_index)
 129 {
 130         unsigned long flags;
 131
 132         spin_lock_irqsave(&canvas->lock, flags);
 133         if (!canvas->used[canvas_index]) {
 134                 dev_err(canvas->dev,
 135                         "Trying to free unused canvas %u\n", canvas_index);
 136                 spin_unlock_irqrestore(&canvas->lock, flags);
 137                 return -EINVAL;
 138         }
 139         canvas->used[canvas_index] = 0;
 140         spin_unlock_irqrestore(&canvas->lock, flags);
 141
 142         return 0;
 143 }
 144 EXPORT_SYMBOL_GPL(meson_canvas_free);
 145
 146 static int meson_canvas_probe(struct platform_device *pdev)
 147 {
 148         struct resource *res;
 149         struct meson_canvas *canvas;
 150         struct device *dev = &pdev->dev;
 151
 152         canvas = devm_kzalloc(dev, sizeof(*canvas), GFP_KERNEL);
 153         if (!canvas)
 154                 return -ENOMEM;
 155
 156         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 157         canvas->reg_base = devm_ioremap_resource(dev, res);
 158         if (IS_ERR(canvas->reg_base))
 159                 return PTR_ERR(canvas->reg_base);
 160
 161         canvas->dev = dev;
 162         spin_lock_init(&canvas->lock);
 163         dev_set_drvdata(dev, canvas);
 164
 165         return 0;
 166 }
 167
 168 static const struct of_device_id canvas_dt_match[] = {
 169         { .compatible = "amlogic,canvas" },
 170         {}
 171 };
 172 MODULE_DEVICE_TABLE(of, canvas_dt_match);
 173
 174 static struct platform_driver meson_canvas_driver = {
 175         .probe = meson_canvas_probe,
 176         .driver = {
 177                 .name = "amlogic-canvas",
 178                 .of_match_table = canvas_dt_match,
 179         },
 180 };
 181 module_platform_driver(meson_canvas_driver);
 182
 183 MODULE_DESCRIPTION("Amlogic Canvas driver");
 184 MODULE_AUTHOR("Maxime Jourdan <mjourdan@baylibre.com>");
 185 MODULE_LICENSE("GPL");