drivers/gpu/drm/shmobile/shmob_drm_drv.c

   1 /*
   2  * shmob_drm_drv.c  --  SH Mobile DRM driver
   3  *
   4  * Copyright (C) 2012 Renesas Electronics Corporation
   5  *
   6  * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/io.h>
  16 #include <linux/mm.h>
  17 #include <linux/module.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/pm.h>
  20 #include <linux/slab.h>
  21
  22 #include <drm/drmP.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <drm/drm_gem_cma_helper.h>
  25
  26 #include "shmob_drm_crtc.h"
  27 #include "shmob_drm_drv.h"
  28 #include "shmob_drm_kms.h"
  29 #include "shmob_drm_plane.h"
  30 #include "shmob_drm_regs.h"
  31
  32 /* -----------------------------------------------------------------------------
  33  * Hardware initialization
  34  */
  35
  36 static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
  37 {
  38         static const u32 ldmt1r[] = {
  39                 [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
  40                 [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
  41                 [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
  42                 [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
  43                 [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
  44                 [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
  45                 [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
  46                 [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
  47                 [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
  48                 [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
  49                 [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
  50                 [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
  51                 [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
  52                 [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
  53                 [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
  54                 [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
  55                 [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
  56                 [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
  57                 [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
  58         };
  59
  60         if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
  61                 dev_err(sdev->dev, "invalid interface type %u\n",
  62                         sdev->pdata->iface.interface);
  63                 return -EINVAL;
  64         }
  65
  66         sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
  67         return 0;
  68 }
  69
  70 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
  71                                             enum shmob_drm_clk_source clksrc)
  72 {
  73         struct clk *clk;
  74         char *clkname;
  75
  76         switch (clksrc) {
  77         case SHMOB_DRM_CLK_BUS:
  78                 clkname = "bus_clk";
  79                 sdev->lddckr = LDDCKR_ICKSEL_BUS;
  80                 break;
  81         case SHMOB_DRM_CLK_PERIPHERAL:
  82                 clkname = "peripheral_clk";
  83                 sdev->lddckr = LDDCKR_ICKSEL_MIPI;
  84                 break;
  85         case SHMOB_DRM_CLK_EXTERNAL:
  86                 clkname = NULL;
  87                 sdev->lddckr = LDDCKR_ICKSEL_HDMI;
  88                 break;
  89         default:
  90                 return -EINVAL;
  91         }
  92
  93         clk = devm_clk_get(sdev->dev, clkname);
  94         if (IS_ERR(clk)) {
  95                 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
  96                 return PTR_ERR(clk);
  97         }
  98
  99         sdev->clock = clk;
 100         return 0;
 101 }
 102
 103 /* -----------------------------------------------------------------------------
 104  * DRM operations
 105  */
 106
 107 static int shmob_drm_unload(struct drm_device *dev)
 108 {
 109         drm_kms_helper_poll_fini(dev);
 110         drm_mode_config_cleanup(dev);
 111         drm_vblank_cleanup(dev);
 112         drm_irq_uninstall(dev);
 113
 114         dev->dev_private = NULL;
 115
 116         return 0;
 117 }
 118
 119 static int shmob_drm_load(struct drm_device *dev, unsigned long flags)
 120 {
 121         struct shmob_drm_platform_data *pdata = dev->dev->platform_data;
 122         struct platform_device *pdev = dev->platformdev;
 123         struct shmob_drm_device *sdev;
 124         struct resource *res;
 125         unsigned int i;
 126         int ret;
 127
 128         if (pdata == NULL) {
 129                 dev_err(dev->dev, "no platform data\n");
 130                 return -EINVAL;
 131         }
 132
 133         sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
 134         if (sdev == NULL) {
 135                 dev_err(dev->dev, "failed to allocate private data\n");
 136                 return -ENOMEM;
 137         }
 138
 139         sdev->dev = &pdev->dev;
 140         sdev->pdata = pdata;
 141         spin_lock_init(&sdev->irq_lock);
 142
 143         sdev->ddev = dev;
 144         dev->dev_private = sdev;
 145
 146         /* I/O resources and clocks */
 147         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 148         if (res == NULL) {
 149                 dev_err(&pdev->dev, "failed to get memory resource\n");
 150                 return -EINVAL;
 151         }
 152
 153         sdev->mmio = devm_ioremap_nocache(&pdev->dev, res->start,
 154                                           resource_size(res));
 155         if (sdev->mmio == NULL) {
 156                 dev_err(&pdev->dev, "failed to remap memory resource\n");
 157                 return -ENOMEM;
 158         }
 159
 160         ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
 161         if (ret < 0)
 162                 return ret;
 163
 164         ret = shmob_drm_init_interface(sdev);
 165         if (ret < 0)
 166                 return ret;
 167
 168         ret = shmob_drm_modeset_init(sdev);
 169         if (ret < 0) {
 170                 dev_err(&pdev->dev, "failed to initialize mode setting\n");
 171                 return ret;
 172         }
 173
 174         for (i = 0; i < 4; ++i) {
 175                 ret = shmob_drm_plane_create(sdev, i);
 176                 if (ret < 0) {
 177                         dev_err(&pdev->dev, "failed to create plane %u\n", i);
 178                         goto done;
 179                 }
 180         }
 181
 182         ret = drm_vblank_init(dev, 1);
 183         if (ret < 0) {
 184                 dev_err(&pdev->dev, "failed to initialize vblank\n");
 185                 goto done;
 186         }
 187
 188         ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
 189         if (ret < 0) {
 190                 dev_err(&pdev->dev, "failed to install IRQ handler\n");
 191                 goto done;
 192         }
 193
 194         platform_set_drvdata(pdev, sdev);
 195
 196 done:
 197         if (ret)
 198                 shmob_drm_unload(dev);
 199
 200         return ret;
 201 }
 202
 203 static irqreturn_t shmob_drm_irq(int irq, void *arg)
 204 {
 205         struct drm_device *dev = arg;
 206         struct shmob_drm_device *sdev = dev->dev_private;
 207         unsigned long flags;
 208         u32 status;
 209
 210         /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
 211          * bits in the same register is really brain-dead design and requires
 212          * taking a spinlock.
 213          */
 214         spin_lock_irqsave(&sdev->irq_lock, flags);
 215         status = lcdc_read(sdev, LDINTR);
 216         lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
 217         spin_unlock_irqrestore(&sdev->irq_lock, flags);
 218
 219         if (status & LDINTR_VES) {
 220                 drm_handle_vblank(dev, 0);
 221                 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
 222         }
 223
 224         return IRQ_HANDLED;
 225 }
 226
 227 static int shmob_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
 228 {
 229         struct shmob_drm_device *sdev = dev->dev_private;
 230
 231         shmob_drm_crtc_enable_vblank(sdev, true);
 232
 233         return 0;
 234 }
 235
 236 static void shmob_drm_disable_vblank(struct drm_device *dev, unsigned int pipe)
 237 {
 238         struct shmob_drm_device *sdev = dev->dev_private;
 239
 240         shmob_drm_crtc_enable_vblank(sdev, false);
 241 }
 242
 243 static const struct file_operations shmob_drm_fops = {
 244         .owner          = THIS_MODULE,
 245         .open           = drm_open,
 246         .release        = drm_release,
 247         .unlocked_ioctl = drm_ioctl,
 248 #ifdef CONFIG_COMPAT
 249         .compat_ioctl   = drm_compat_ioctl,
 250 #endif
 251         .poll           = drm_poll,
 252         .read           = drm_read,
 253         .llseek         = no_llseek,
 254         .mmap           = drm_gem_cma_mmap,
 255 };
 256
 257 static struct drm_driver shmob_drm_driver = {
 258         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
 259                                 | DRIVER_PRIME,
 260         .load                   = shmob_drm_load,
 261         .unload                 = shmob_drm_unload,
 262         .irq_handler            = shmob_drm_irq,
 263         .get_vblank_counter     = drm_vblank_no_hw_counter,
 264         .enable_vblank          = shmob_drm_enable_vblank,
 265         .disable_vblank         = shmob_drm_disable_vblank,
 266         .gem_free_object_unlocked = drm_gem_cma_free_object,
 267         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 268         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 269         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 270         .gem_prime_import       = drm_gem_prime_import,
 271         .gem_prime_export       = drm_gem_prime_export,
 272         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 273         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 274         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 275         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 276         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 277         .dumb_create            = drm_gem_cma_dumb_create,
 278         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 279         .dumb_destroy           = drm_gem_dumb_destroy,
 280         .fops                   = &shmob_drm_fops,
 281         .name                   = "shmob-drm",
 282         .desc                   = "Renesas SH Mobile DRM",
 283         .date                   = "20120424",
 284         .major                  = 1,
 285         .minor                  = 0,
 286 };
 287
 288 /* -----------------------------------------------------------------------------
 289  * Power management
 290  */
 291
 292 #ifdef CONFIG_PM_SLEEP
 293 static int shmob_drm_pm_suspend(struct device *dev)
 294 {
 295         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 296
 297         drm_kms_helper_poll_disable(sdev->ddev);
 298         shmob_drm_crtc_suspend(&sdev->crtc);
 299
 300         return 0;
 301 }
 302
 303 static int shmob_drm_pm_resume(struct device *dev)
 304 {
 305         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 306
 307         drm_modeset_lock_all(sdev->ddev);
 308         shmob_drm_crtc_resume(&sdev->crtc);
 309         drm_modeset_unlock_all(sdev->ddev);
 310
 311         drm_kms_helper_poll_enable(sdev->ddev);
 312         return 0;
 313 }
 314 #endif
 315
 316 static const struct dev_pm_ops shmob_drm_pm_ops = {
 317         SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
 318 };
 319
 320 /* -----------------------------------------------------------------------------
 321  * Platform driver
 322  */
 323
 324 static int shmob_drm_probe(struct platform_device *pdev)
 325 {
 326         return drm_platform_init(&shmob_drm_driver, pdev);
 327 }
 328
 329 static int shmob_drm_remove(struct platform_device *pdev)
 330 {
 331         struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
 332
 333         drm_put_dev(sdev->ddev);
 334
 335         return 0;
 336 }
 337
 338 static struct platform_driver shmob_drm_platform_driver = {
 339         .probe          = shmob_drm_probe,
 340         .remove         = shmob_drm_remove,
 341         .driver         = {
 342                 .name   = "shmob-drm",
 343                 .pm     = &shmob_drm_pm_ops,
 344         },
 345 };
 346
 347 module_platform_driver(shmob_drm_platform_driver);
 348
 349 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 350 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
 351 MODULE_LICENSE("GPL");