drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * shmob_drm_drv.c  --  SH Mobile DRM driver
   4  *
   5  * Copyright (C) 2012 Renesas Electronics Corporation
   6  *
   7  * Laurent Pinchart ([email protected])
   8  */
   9
  10 #include <linux/clk.h>
  11 #include <linux/io.h>
  12 #include <linux/mm.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/slab.h>
  19
  20 #include <drm/drm_atomic_helper.h>
  21 #include <drm/drm_drv.h>
  22 #include <drm/drm_fbdev_dma.h>
  23 #include <drm/drm_gem_dma_helper.h>
  24 #include <drm/drm_modeset_helper.h>
  25 #include <drm/drm_module.h>
  26 #include <drm/drm_probe_helper.h>
  27 #include <drm/drm_vblank.h>
  28
  29 #include "shmob_drm_drv.h"
  30 #include "shmob_drm_kms.h"
  31 #include "shmob_drm_plane.h"
  32 #include "shmob_drm_regs.h"
  33
  34 /* -----------------------------------------------------------------------------
  35  * Hardware initialization
  36  */
  37
  38 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
  39                                   enum shmob_drm_clk_source clksrc)
  40 {
  41         struct clk *clk;
  42         char *clkname;
  43
  44         switch (clksrc) {
  45         case SHMOB_DRM_CLK_BUS:
  46                 clkname = "fck";
  47                 sdev->lddckr = LDDCKR_ICKSEL_BUS;
  48                 break;
  49         case SHMOB_DRM_CLK_PERIPHERAL:
  50                 clkname = "media";
  51                 sdev->lddckr = LDDCKR_ICKSEL_MIPI;
  52                 break;
  53         case SHMOB_DRM_CLK_EXTERNAL:
  54                 clkname = "lclk";
  55                 sdev->lddckr = LDDCKR_ICKSEL_HDMI;
  56                 break;
  57         default:
  58                 return -EINVAL;
  59         }
  60
  61         clk = devm_clk_get(sdev->dev, clkname);
  62         if (IS_ERR(clk)) {
  63                 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
  64                 return PTR_ERR(clk);
  65         }
  66
  67         sdev->clock = clk;
  68         return 0;
  69 }
  70
  71 /* -----------------------------------------------------------------------------
  72  * DRM operations
  73  */
  74
  75 static irqreturn_t shmob_drm_irq(int irq, void *arg)
  76 {
  77         struct drm_device *dev = arg;
  78         struct shmob_drm_device *sdev = to_shmob_device(dev);
  79         unsigned long flags;
  80         u32 status;
  81
  82         /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
  83          * bits in the same register is really brain-dead design and requires
  84          * taking a spinlock.
  85          */
  86         spin_lock_irqsave(&sdev->irq_lock, flags);
  87         status = lcdc_read(sdev, LDINTR);
  88         lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
  89         spin_unlock_irqrestore(&sdev->irq_lock, flags);
  90
  91         if (status & LDINTR_VES) {
  92                 drm_crtc_handle_vblank(&sdev->crtc.base);
  93                 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
  94         }
  95
  96         return IRQ_HANDLED;
  97 }
  98
  99 DEFINE_DRM_GEM_DMA_FOPS(shmob_drm_fops);
 100
 101 static const struct drm_driver shmob_drm_driver = {
 102         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 103         DRM_GEM_DMA_DRIVER_OPS,
 104         .fops                   = &shmob_drm_fops,
 105         .name                   = "shmob-drm",
 106         .desc                   = "Renesas SH Mobile DRM",
 107         .date                   = "20120424",
 108         .major                  = 1,
 109         .minor                  = 0,
 110 };
 111
 112 /* -----------------------------------------------------------------------------
 113  * Power management
 114  */
 115
 116 static int shmob_drm_pm_suspend(struct device *dev)
 117 {
 118         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 119
 120         return drm_mode_config_helper_suspend(&sdev->ddev);
 121 }
 122
 123 static int shmob_drm_pm_resume(struct device *dev)
 124 {
 125         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 126
 127         return drm_mode_config_helper_resume(&sdev->ddev);
 128 }
 129
 130 static int shmob_drm_pm_runtime_suspend(struct device *dev)
 131 {
 132         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 133
 134         if (sdev->clock)
 135                 clk_disable_unprepare(sdev->clock);
 136
 137         return 0;
 138 }
 139
 140 static int shmob_drm_pm_runtime_resume(struct device *dev)
 141 {
 142         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 143         int ret;
 144
 145         if (sdev->clock) {
 146                 ret = clk_prepare_enable(sdev->clock);
 147                 if (ret < 0)
 148                         return ret;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static const struct dev_pm_ops shmob_drm_pm_ops = {
 155         SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
 156         RUNTIME_PM_OPS(shmob_drm_pm_runtime_suspend,
 157                        shmob_drm_pm_runtime_resume, NULL)
 158 };
 159
 160 /* -----------------------------------------------------------------------------
 161  * Platform driver
 162  */
 163
 164 static void shmob_drm_remove(struct platform_device *pdev)
 165 {
 166         struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
 167         struct drm_device *ddev = &sdev->ddev;
 168
 169         drm_dev_unregister(ddev);
 170         drm_atomic_helper_shutdown(ddev);
 171         drm_kms_helper_poll_fini(ddev);
 172 }
 173
 174 static void shmob_drm_shutdown(struct platform_device *pdev)
 175 {
 176         struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
 177
 178         drm_atomic_helper_shutdown(&sdev->ddev);
 179 }
 180
 181 static int shmob_drm_probe(struct platform_device *pdev)
 182 {
 183         struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
 184         const struct shmob_drm_config *config;
 185         struct shmob_drm_device *sdev;
 186         struct drm_device *ddev;
 187         int ret;
 188
 189         config = of_device_get_match_data(&pdev->dev);
 190         if (!config && !pdata) {
 191                 dev_err(&pdev->dev, "no platform data\n");
 192                 return -EINVAL;
 193         }
 194
 195         /*
 196          * Allocate and initialize the DRM device, driver private data, I/O
 197          * resources and clocks.
 198          */
 199         sdev = devm_drm_dev_alloc(&pdev->dev, &shmob_drm_driver,
 200                                   struct shmob_drm_device, ddev);
 201         if (IS_ERR(sdev))
 202                 return PTR_ERR(sdev);
 203
 204         ddev = &sdev->ddev;
 205         sdev->dev = &pdev->dev;
 206         if (config) {
 207                 sdev->config = *config;
 208         } else {
 209                 sdev->pdata = pdata;
 210                 sdev->config.clk_source = pdata->clk_source;
 211                 sdev->config.clk_div = pdata->iface.clk_div;
 212         }
 213         spin_lock_init(&sdev->irq_lock);
 214
 215         platform_set_drvdata(pdev, sdev);
 216
 217         sdev->mmio = devm_platform_ioremap_resource(pdev, 0);
 218         if (IS_ERR(sdev->mmio))
 219                 return PTR_ERR(sdev->mmio);
 220
 221         ret = shmob_drm_setup_clocks(sdev, sdev->config.clk_source);
 222         if (ret < 0)
 223                 return ret;
 224
 225         ret = devm_pm_runtime_enable(&pdev->dev);
 226         if (ret)
 227                 return ret;
 228
 229         ret = drm_vblank_init(ddev, 1);
 230         if (ret < 0) {
 231                 dev_err(&pdev->dev, "failed to initialize vblank\n");
 232                 return ret;
 233         }
 234
 235         ret = shmob_drm_modeset_init(sdev);
 236         if (ret < 0)
 237                 return dev_err_probe(&pdev->dev, ret,
 238                                      "failed to initialize mode setting\n");
 239
 240         ret = platform_get_irq(pdev, 0);
 241         if (ret < 0)
 242                 goto err_modeset_cleanup;
 243         sdev->irq = ret;
 244
 245         ret = devm_request_irq(&pdev->dev, sdev->irq, shmob_drm_irq, 0,
 246                                ddev->driver->name, ddev);
 247         if (ret < 0) {
 248                 dev_err(&pdev->dev, "failed to install IRQ handler\n");
 249                 goto err_modeset_cleanup;
 250         }
 251
 252         /*
 253          * Register the DRM device with the core and the connectors with
 254          * sysfs.
 255          */
 256         ret = drm_dev_register(ddev, 0);
 257         if (ret < 0)
 258                 goto err_modeset_cleanup;
 259
 260         drm_fbdev_dma_setup(ddev, 16);
 261
 262         return 0;
 263
 264 err_modeset_cleanup:
 265         drm_kms_helper_poll_fini(ddev);
 266         return ret;
 267 }
 268
 269 static const struct shmob_drm_config shmob_arm_config = {
 270         .clk_source = SHMOB_DRM_CLK_BUS,
 271         .clk_div = 5,
 272 };
 273
 274 static const struct of_device_id shmob_drm_of_table[] __maybe_unused = {
 275         { .compatible = "renesas,r8a7740-lcdc", .data = &shmob_arm_config, },
 276         { .compatible = "renesas,sh73a0-lcdc",  .data = &shmob_arm_config, },
 277         { /* sentinel */ }
 278 };
 279
 280 static struct platform_driver shmob_drm_platform_driver = {
 281         .probe          = shmob_drm_probe,
 282         .remove_new     = shmob_drm_remove,
 283         .shutdown       = shmob_drm_shutdown,
 284         .driver         = {
 285                 .name   = "shmob-drm",
 286                 .of_match_table = of_match_ptr(shmob_drm_of_table),
 287                 .pm     = &shmob_drm_pm_ops,
 288         },
 289 };
 290
 291 drm_module_platform_driver(shmob_drm_platform_driver);
 292
 293 MODULE_AUTHOR("Laurent Pinchart <[email protected]>");
 294 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
 295 MODULE_LICENSE("GPL");