drivers/gpu/drm/sun4i/sun8i_tcon_top.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net> */
   3
   4
   5 #include <linux/bitfield.h>
   6 #include <linux/component.h>
   7 #include <linux/device.h>
   8 #include <linux/io.h>
   9 #include <linux/module.h>
  10 #include <linux/of_device.h>
  11 #include <linux/of_graph.h>
  12 #include <linux/platform_device.h>
  13
  14 #include <dt-bindings/clock/sun8i-tcon-top.h>
  15
  16 #include "sun8i_tcon_top.h"
  17
  18 struct sun8i_tcon_top_quirks {
  19         bool has_tcon_tv1;
  20         bool has_dsi;
  21 };
  22
  23 static bool sun8i_tcon_top_node_is_tcon_top(struct device_node *node)
  24 {
  25         return !!of_match_node(sun8i_tcon_top_of_table, node);
  26 }
  27
  28 int sun8i_tcon_top_set_hdmi_src(struct device *dev, int tcon)
  29 {
  30         struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev);
  31         unsigned long flags;
  32         u32 val;
  33
  34         if (!sun8i_tcon_top_node_is_tcon_top(dev->of_node)) {
  35                 dev_err(dev, "Device is not TCON TOP!\n");
  36                 return -EINVAL;
  37         }
  38
  39         if (tcon < 2 || tcon > 3) {
  40                 dev_err(dev, "TCON index must be 2 or 3!\n");
  41                 return -EINVAL;
  42         }
  43
  44         spin_lock_irqsave(&tcon_top->reg_lock, flags);
  45
  46         val = readl(tcon_top->regs + TCON_TOP_GATE_SRC_REG);
  47         val &= ~TCON_TOP_HDMI_SRC_MSK;
  48         val |= FIELD_PREP(TCON_TOP_HDMI_SRC_MSK, tcon - 1);
  49         writel(val, tcon_top->regs + TCON_TOP_GATE_SRC_REG);
  50
  51         spin_unlock_irqrestore(&tcon_top->reg_lock, flags);
  52
  53         return 0;
  54 }
  55 EXPORT_SYMBOL(sun8i_tcon_top_set_hdmi_src);
  56
  57 int sun8i_tcon_top_de_config(struct device *dev, int mixer, int tcon)
  58 {
  59         struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev);
  60         unsigned long flags;
  61         u32 reg;
  62
  63         if (!sun8i_tcon_top_node_is_tcon_top(dev->of_node)) {
  64                 dev_err(dev, "Device is not TCON TOP!\n");
  65                 return -EINVAL;
  66         }
  67
  68         if (mixer > 1) {
  69                 dev_err(dev, "Mixer index is too high!\n");
  70                 return -EINVAL;
  71         }
  72
  73         if (tcon > 3) {
  74                 dev_err(dev, "TCON index is too high!\n");
  75                 return -EINVAL;
  76         }
  77
  78         spin_lock_irqsave(&tcon_top->reg_lock, flags);
  79
  80         reg = readl(tcon_top->regs + TCON_TOP_PORT_SEL_REG);
  81         if (mixer == 0) {
  82                 reg &= ~TCON_TOP_PORT_DE0_MSK;
  83                 reg |= FIELD_PREP(TCON_TOP_PORT_DE0_MSK, tcon);
  84         } else {
  85                 reg &= ~TCON_TOP_PORT_DE1_MSK;
  86                 reg |= FIELD_PREP(TCON_TOP_PORT_DE1_MSK, tcon);
  87         }
  88         writel(reg, tcon_top->regs + TCON_TOP_PORT_SEL_REG);
  89
  90         spin_unlock_irqrestore(&tcon_top->reg_lock, flags);
  91
  92         return 0;
  93 }
  94 EXPORT_SYMBOL(sun8i_tcon_top_de_config);
  95
  96
  97 static struct clk_hw *sun8i_tcon_top_register_gate(struct device *dev,
  98                                                    const char *parent,
  99                                                    void __iomem *regs,
 100                                                    spinlock_t *lock,
 101                                                    u8 bit, int name_index)
 102 {
 103         const char *clk_name, *parent_name;
 104         int ret, index;
 105
 106         index = of_property_match_string(dev->of_node, "clock-names", parent);
 107         if (index < 0)
 108                 return ERR_PTR(index);
 109
 110         parent_name = of_clk_get_parent_name(dev->of_node, index);
 111
 112         ret = of_property_read_string_index(dev->of_node,
 113                                             "clock-output-names", name_index,
 114                                             &clk_name);
 115         if (ret)
 116                 return ERR_PTR(ret);
 117
 118         return clk_hw_register_gate(dev, clk_name, parent_name,
 119                                     CLK_SET_RATE_PARENT,
 120                                     regs + TCON_TOP_GATE_SRC_REG,
 121                                     bit, 0, lock);
 122 };
 123
 124 static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
 125                                void *data)
 126 {
 127         struct platform_device *pdev = to_platform_device(dev);
 128         struct clk_hw_onecell_data *clk_data;
 129         struct sun8i_tcon_top *tcon_top;
 130         const struct sun8i_tcon_top_quirks *quirks;
 131         struct resource *res;
 132         void __iomem *regs;
 133         int ret, i;
 134
 135         quirks = of_device_get_match_data(&pdev->dev);
 136
 137         tcon_top = devm_kzalloc(dev, sizeof(*tcon_top), GFP_KERNEL);
 138         if (!tcon_top)
 139                 return -ENOMEM;
 140
 141         clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, CLK_NUM),
 142                                 GFP_KERNEL);
 143         if (!clk_data)
 144                 return -ENOMEM;
 145         tcon_top->clk_data = clk_data;
 146
 147         spin_lock_init(&tcon_top->reg_lock);
 148
 149         tcon_top->rst = devm_reset_control_get(dev, NULL);
 150         if (IS_ERR(tcon_top->rst)) {
 151                 dev_err(dev, "Couldn't get our reset line\n");
 152                 return PTR_ERR(tcon_top->rst);
 153         }
 154
 155         tcon_top->bus = devm_clk_get(dev, "bus");
 156         if (IS_ERR(tcon_top->bus)) {
 157                 dev_err(dev, "Couldn't get the bus clock\n");
 158                 return PTR_ERR(tcon_top->bus);
 159         }
 160
 161         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 162         regs = devm_ioremap_resource(dev, res);
 163         tcon_top->regs = regs;
 164         if (IS_ERR(regs))
 165                 return PTR_ERR(regs);
 166
 167         ret = reset_control_deassert(tcon_top->rst);
 168         if (ret) {
 169                 dev_err(dev, "Could not deassert ctrl reset control\n");
 170                 return ret;
 171         }
 172
 173         ret = clk_prepare_enable(tcon_top->bus);
 174         if (ret) {
 175                 dev_err(dev, "Could not enable bus clock\n");
 176                 goto err_assert_reset;
 177         }
 178
 179         /*
 180          * At least on H6, some registers have some bits set by default
 181          * which may cause issues. Clear them here.
 182          */
 183         writel(0, regs + TCON_TOP_PORT_SEL_REG);
 184         writel(0, regs + TCON_TOP_GATE_SRC_REG);
 185
 186         /*
 187          * TCON TOP has two muxes, which select parent clock for each TCON TV
 188          * channel clock. Parent could be either TCON TV or TVE clock. For now
 189          * we leave this fixed to TCON TV, since TVE driver for R40 is not yet
 190          * implemented. Once it is, graph needs to be traversed to determine
 191          * if TVE is active on each TCON TV. If it is, mux should be switched
 192          * to TVE clock parent.
 193          */
 194         clk_data->hws[CLK_TCON_TOP_TV0] =
 195                 sun8i_tcon_top_register_gate(dev, "tcon-tv0", regs,
 196                                              &tcon_top->reg_lock,
 197                                              TCON_TOP_TCON_TV0_GATE, 0);
 198
 199         if (quirks->has_tcon_tv1)
 200                 clk_data->hws[CLK_TCON_TOP_TV1] =
 201                         sun8i_tcon_top_register_gate(dev, "tcon-tv1", regs,
 202                                                      &tcon_top->reg_lock,
 203                                                      TCON_TOP_TCON_TV1_GATE, 1);
 204
 205         if (quirks->has_dsi)
 206                 clk_data->hws[CLK_TCON_TOP_DSI] =
 207                         sun8i_tcon_top_register_gate(dev, "dsi", regs,
 208                                                      &tcon_top->reg_lock,
 209                                                      TCON_TOP_TCON_DSI_GATE, 2);
 210
 211         for (i = 0; i < CLK_NUM; i++)
 212                 if (IS_ERR(clk_data->hws[i])) {
 213                         ret = PTR_ERR(clk_data->hws[i]);
 214                         goto err_unregister_gates;
 215                 }
 216
 217         clk_data->num = CLK_NUM;
 218
 219         ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
 220                                      clk_data);
 221         if (ret)
 222                 goto err_unregister_gates;
 223
 224         dev_set_drvdata(dev, tcon_top);
 225
 226         return 0;
 227
 228 err_unregister_gates:
 229         for (i = 0; i < CLK_NUM; i++)
 230                 if (!IS_ERR_OR_NULL(clk_data->hws[i]))
 231                         clk_hw_unregister_gate(clk_data->hws[i]);
 232         clk_disable_unprepare(tcon_top->bus);
 233 err_assert_reset:
 234         reset_control_assert(tcon_top->rst);
 235
 236         return ret;
 237 }
 238
 239 static void sun8i_tcon_top_unbind(struct device *dev, struct device *master,
 240                                   void *data)
 241 {
 242         struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev);
 243         struct clk_hw_onecell_data *clk_data = tcon_top->clk_data;
 244         int i;
 245
 246         of_clk_del_provider(dev->of_node);
 247         for (i = 0; i < CLK_NUM; i++)
 248                 if (clk_data->hws[i])
 249                         clk_hw_unregister_gate(clk_data->hws[i]);
 250
 251         clk_disable_unprepare(tcon_top->bus);
 252         reset_control_assert(tcon_top->rst);
 253 }
 254
 255 static const struct component_ops sun8i_tcon_top_ops = {
 256         .bind   = sun8i_tcon_top_bind,
 257         .unbind = sun8i_tcon_top_unbind,
 258 };
 259
 260 static int sun8i_tcon_top_probe(struct platform_device *pdev)
 261 {
 262         return component_add(&pdev->dev, &sun8i_tcon_top_ops);
 263 }
 264
 265 static int sun8i_tcon_top_remove(struct platform_device *pdev)
 266 {
 267         component_del(&pdev->dev, &sun8i_tcon_top_ops);
 268
 269         return 0;
 270 }
 271
 272 static const struct sun8i_tcon_top_quirks sun8i_r40_tcon_top_quirks = {
 273         .has_tcon_tv1   = true,
 274         .has_dsi        = true,
 275 };
 276
 277 static const struct sun8i_tcon_top_quirks sun50i_h6_tcon_top_quirks = {
 278         /* Nothing special */
 279 };
 280
 281 /* sun4i_drv uses this list to check if a device node is a TCON TOP */
 282 const struct of_device_id sun8i_tcon_top_of_table[] = {
 283         {
 284                 .compatible = "allwinner,sun8i-r40-tcon-top",
 285                 .data = &sun8i_r40_tcon_top_quirks
 286         },
 287         {
 288                 .compatible = "allwinner,sun50i-h6-tcon-top",
 289                 .data = &sun50i_h6_tcon_top_quirks
 290         },
 291         { /* sentinel */ }
 292 };
 293 MODULE_DEVICE_TABLE(of, sun8i_tcon_top_of_table);
 294 EXPORT_SYMBOL(sun8i_tcon_top_of_table);
 295
 296 static struct platform_driver sun8i_tcon_top_platform_driver = {
 297         .probe          = sun8i_tcon_top_probe,
 298         .remove         = sun8i_tcon_top_remove,
 299         .driver         = {
 300                 .name           = "sun8i-tcon-top",
 301                 .of_match_table = sun8i_tcon_top_of_table,
 302         },
 303 };
 304 module_platform_driver(sun8i_tcon_top_platform_driver);
 305
 306 MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
 307 MODULE_DESCRIPTION("Allwinner R40 TCON TOP driver");
 308 MODULE_LICENSE("GPL");