drivers/gpu/drm/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 (laurent.pinchart@ideasonboard.com)
   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/platform_device.h>
  15 #include <linux/pm.h>
  16 #include <linux/slab.h>
  17
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_drv.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_irq.h>
  22 #include <drm/drm_probe_helper.h>
  23 #include <drm/drm_vblank.h>
  24
  25 #include "shmob_drm_drv.h"
  26 #include "shmob_drm_kms.h"
  27 #include "shmob_drm_plane.h"
  28 #include "shmob_drm_regs.h"
  29
  30 /* -----------------------------------------------------------------------------
  31  * Hardware initialization
  32  */
  33
  34 static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
  35 {
  36         static const u32 ldmt1r[] = {
  37                 [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
  38                 [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
  39                 [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
  40                 [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
  41                 [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
  42                 [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
  43                 [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
  44                 [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
  45                 [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
  46                 [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
  47                 [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
  48                 [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
  49                 [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
  50                 [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
  51                 [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
  52                 [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
  53                 [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
  54                 [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
  55                 [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
  56         };
  57
  58         if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
  59                 dev_err(sdev->dev, "invalid interface type %u\n",
  60                         sdev->pdata->iface.interface);
  61                 return -EINVAL;
  62         }
  63
  64         sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
  65         return 0;
  66 }
  67
  68 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
  69                                             enum shmob_drm_clk_source clksrc)
  70 {
  71         struct clk *clk;
  72         char *clkname;
  73
  74         switch (clksrc) {
  75         case SHMOB_DRM_CLK_BUS:
  76                 clkname = "bus_clk";
  77                 sdev->lddckr = LDDCKR_ICKSEL_BUS;
  78                 break;
  79         case SHMOB_DRM_CLK_PERIPHERAL:
  80                 clkname = "peripheral_clk";
  81                 sdev->lddckr = LDDCKR_ICKSEL_MIPI;
  82                 break;
  83         case SHMOB_DRM_CLK_EXTERNAL:
  84                 clkname = NULL;
  85                 sdev->lddckr = LDDCKR_ICKSEL_HDMI;
  86                 break;
  87         default:
  88                 return -EINVAL;
  89         }
  90
  91         clk = devm_clk_get(sdev->dev, clkname);
  92         if (IS_ERR(clk)) {
  93                 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
  94                 return PTR_ERR(clk);
  95         }
  96
  97         sdev->clock = clk;
  98         return 0;
  99 }
 100
 101 /* -----------------------------------------------------------------------------
 102  * DRM operations
 103  */
 104
 105 static irqreturn_t shmob_drm_irq(int irq, void *arg)
 106 {
 107         struct drm_device *dev = arg;
 108         struct shmob_drm_device *sdev = dev->dev_private;
 109         unsigned long flags;
 110         u32 status;
 111
 112         /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
 113          * bits in the same register is really brain-dead design and requires
 114          * taking a spinlock.
 115          */
 116         spin_lock_irqsave(&sdev->irq_lock, flags);
 117         status = lcdc_read(sdev, LDINTR);
 118         lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
 119         spin_unlock_irqrestore(&sdev->irq_lock, flags);
 120
 121         if (status & LDINTR_VES) {
 122                 drm_handle_vblank(dev, 0);
 123                 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
 124         }
 125
 126         return IRQ_HANDLED;
 127 }
 128
 129 DEFINE_DRM_GEM_CMA_FOPS(shmob_drm_fops);
 130
 131 static struct drm_driver shmob_drm_driver = {
 132         .driver_features        = DRIVER_GEM | DRIVER_MODESET,
 133         .irq_handler            = shmob_drm_irq,
 134         .gem_free_object_unlocked = drm_gem_cma_free_object,
 135         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 136         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 137         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 138         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 139         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 140         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 141         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 142         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 143         .dumb_create            = drm_gem_cma_dumb_create,
 144         .fops                   = &shmob_drm_fops,
 145         .name                   = "shmob-drm",
 146         .desc                   = "Renesas SH Mobile DRM",
 147         .date                   = "20120424",
 148         .major                  = 1,
 149         .minor                  = 0,
 150 };
 151
 152 /* -----------------------------------------------------------------------------
 153  * Power management
 154  */
 155
 156 #ifdef CONFIG_PM_SLEEP
 157 static int shmob_drm_pm_suspend(struct device *dev)
 158 {
 159         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 160
 161         drm_kms_helper_poll_disable(sdev->ddev);
 162         shmob_drm_crtc_suspend(&sdev->crtc);
 163
 164         return 0;
 165 }
 166
 167 static int shmob_drm_pm_resume(struct device *dev)
 168 {
 169         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 170
 171         drm_modeset_lock_all(sdev->ddev);
 172         shmob_drm_crtc_resume(&sdev->crtc);
 173         drm_modeset_unlock_all(sdev->ddev);
 174
 175         drm_kms_helper_poll_enable(sdev->ddev);
 176         return 0;
 177 }
 178 #endif
 179
 180 static const struct dev_pm_ops shmob_drm_pm_ops = {
 181         SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
 182 };
 183
 184 /* -----------------------------------------------------------------------------
 185  * Platform driver
 186  */
 187
 188 static int shmob_drm_remove(struct platform_device *pdev)
 189 {
 190         struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
 191         struct drm_device *ddev = sdev->ddev;
 192
 193         drm_dev_unregister(ddev);
 194         drm_kms_helper_poll_fini(ddev);
 195         drm_mode_config_cleanup(ddev);
 196         drm_irq_uninstall(ddev);
 197         drm_dev_put(ddev);
 198
 199         return 0;
 200 }
 201
 202 static int shmob_drm_probe(struct platform_device *pdev)
 203 {
 204         struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
 205         struct shmob_drm_device *sdev;
 206         struct drm_device *ddev;
 207         struct resource *res;
 208         unsigned int i;
 209         int ret;
 210
 211         if (pdata == NULL) {
 212                 dev_err(&pdev->dev, "no platform data\n");
 213                 return -EINVAL;
 214         }
 215
 216         /*
 217          * Allocate and initialize the driver private data, I/O resources and
 218          * clocks.
 219          */
 220         sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
 221         if (sdev == NULL)
 222                 return -ENOMEM;
 223
 224         sdev->dev = &pdev->dev;
 225         sdev->pdata = pdata;
 226         spin_lock_init(&sdev->irq_lock);
 227
 228         platform_set_drvdata(pdev, sdev);
 229
 230         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 231         sdev->mmio = devm_ioremap_resource(&pdev->dev, res);
 232         if (IS_ERR(sdev->mmio))
 233                 return PTR_ERR(sdev->mmio);
 234
 235         ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
 236         if (ret < 0)
 237                 return ret;
 238
 239         ret = shmob_drm_init_interface(sdev);
 240         if (ret < 0)
 241                 return ret;
 242
 243         /* Allocate and initialize the DRM device. */
 244         ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev);
 245         if (IS_ERR(ddev))
 246                 return PTR_ERR(ddev);
 247
 248         sdev->ddev = ddev;
 249         ddev->dev_private = sdev;
 250
 251         ret = shmob_drm_modeset_init(sdev);
 252         if (ret < 0) {
 253                 dev_err(&pdev->dev, "failed to initialize mode setting\n");
 254                 goto err_free_drm_dev;
 255         }
 256
 257         for (i = 0; i < 4; ++i) {
 258                 ret = shmob_drm_plane_create(sdev, i);
 259                 if (ret < 0) {
 260                         dev_err(&pdev->dev, "failed to create plane %u\n", i);
 261                         goto err_modeset_cleanup;
 262                 }
 263         }
 264
 265         ret = drm_vblank_init(ddev, 1);
 266         if (ret < 0) {
 267                 dev_err(&pdev->dev, "failed to initialize vblank\n");
 268                 goto err_modeset_cleanup;
 269         }
 270
 271         ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
 272         if (ret < 0) {
 273                 dev_err(&pdev->dev, "failed to install IRQ handler\n");
 274                 goto err_modeset_cleanup;
 275         }
 276
 277         /*
 278          * Register the DRM device with the core and the connectors with
 279          * sysfs.
 280          */
 281         ret = drm_dev_register(ddev, 0);
 282         if (ret < 0)
 283                 goto err_irq_uninstall;
 284
 285         return 0;
 286
 287 err_irq_uninstall:
 288         drm_irq_uninstall(ddev);
 289 err_modeset_cleanup:
 290         drm_kms_helper_poll_fini(ddev);
 291         drm_mode_config_cleanup(ddev);
 292 err_free_drm_dev:
 293         drm_dev_put(ddev);
 294
 295         return ret;
 296 }
 297
 298 static struct platform_driver shmob_drm_platform_driver = {
 299         .probe          = shmob_drm_probe,
 300         .remove         = shmob_drm_remove,
 301         .driver         = {
 302                 .name   = "shmob-drm",
 303                 .pm     = &shmob_drm_pm_ops,
 304         },
 305 };
 306
 307 module_platform_driver(shmob_drm_platform_driver);
 308
 309 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 310 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
 311 MODULE_LICENSE("GPL");