drivers/gpu/drm/shmobile/shmob_drm_drv.c

   1 /*
   2  * shmob_drm_drv.c  --  SH Mobile DRM driver
   3  *
   4  * Copyright (C) 2012 Renesas 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 __devinit 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 __devinit 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 = 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         struct shmob_drm_device *sdev = dev->dev_private;
 110
 111         drm_kms_helper_poll_fini(dev);
 112         drm_mode_config_cleanup(dev);
 113         drm_vblank_cleanup(dev);
 114         drm_irq_uninstall(dev);
 115
 116         if (sdev->clock)
 117                 clk_put(sdev->clock);
 118
 119         if (sdev->mmio)
 120                 iounmap(sdev->mmio);
 121
 122         dev->dev_private = NULL;
 123         kfree(sdev);
 124
 125         return 0;
 126 }
 127
 128 static int shmob_drm_load(struct drm_device *dev, unsigned long flags)
 129 {
 130         struct shmob_drm_platform_data *pdata = dev->dev->platform_data;
 131         struct platform_device *pdev = dev->platformdev;
 132         struct shmob_drm_device *sdev;
 133         struct resource *res;
 134         unsigned int i;
 135         int ret;
 136
 137         if (pdata == NULL) {
 138                 dev_err(dev->dev, "no platform data\n");
 139                 return -EINVAL;
 140         }
 141
 142         sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
 143         if (sdev == NULL) {
 144                 dev_err(dev->dev, "failed to allocate private data\n");
 145                 return -ENOMEM;
 146         }
 147
 148         sdev->dev = &pdev->dev;
 149         sdev->pdata = pdata;
 150         spin_lock_init(&sdev->irq_lock);
 151
 152         sdev->ddev = dev;
 153         dev->dev_private = sdev;
 154
 155         /* I/O resources and clocks */
 156         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 157         if (res == NULL) {
 158                 dev_err(&pdev->dev, "failed to get memory resource\n");
 159                 ret = -EINVAL;
 160                 goto done;
 161         }
 162
 163         sdev->mmio = ioremap_nocache(res->start, resource_size(res));
 164         if (sdev->mmio == NULL) {
 165                 dev_err(&pdev->dev, "failed to remap memory resource\n");
 166                 ret = -ENOMEM;
 167                 goto done;
 168         }
 169
 170         ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
 171         if (ret < 0)
 172                 goto done;
 173
 174         ret = shmob_drm_init_interface(sdev);
 175         if (ret < 0)
 176                 goto done;
 177
 178         ret = shmob_drm_modeset_init(sdev);
 179         if (ret < 0) {
 180                 dev_err(&pdev->dev, "failed to initialize mode setting\n");
 181                 goto done;
 182         }
 183
 184         for (i = 0; i < 4; ++i) {
 185                 ret = shmob_drm_plane_create(sdev, i);
 186                 if (ret < 0) {
 187                         dev_err(&pdev->dev, "failed to create plane %u\n", i);
 188                         goto done;
 189                 }
 190         }
 191
 192         ret = drm_vblank_init(dev, 1);
 193         if (ret < 0) {
 194                 dev_err(&pdev->dev, "failed to initialize vblank\n");
 195                 goto done;
 196         }
 197
 198         ret = drm_irq_install(dev);
 199         if (ret < 0) {
 200                 dev_err(&pdev->dev, "failed to install IRQ handler\n");
 201                 goto done;
 202         }
 203
 204         platform_set_drvdata(pdev, sdev);
 205
 206 done:
 207         if (ret)
 208                 shmob_drm_unload(dev);
 209
 210         return ret;
 211 }
 212
 213 static void shmob_drm_preclose(struct drm_device *dev, struct drm_file *file)
 214 {
 215         struct shmob_drm_device *sdev = dev->dev_private;
 216
 217         shmob_drm_crtc_cancel_page_flip(&sdev->crtc, file);
 218 }
 219
 220 static irqreturn_t shmob_drm_irq(int irq, void *arg)
 221 {
 222         struct drm_device *dev = arg;
 223         struct shmob_drm_device *sdev = dev->dev_private;
 224         unsigned long flags;
 225         u32 status;
 226
 227         /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
 228          * bits in the same register is really brain-dead design and requires
 229          * taking a spinlock.
 230          */
 231         spin_lock_irqsave(&sdev->irq_lock, flags);
 232         status = lcdc_read(sdev, LDINTR);
 233         lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
 234         spin_unlock_irqrestore(&sdev->irq_lock, flags);
 235
 236         if (status & LDINTR_VES) {
 237                 drm_handle_vblank(dev, 0);
 238                 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
 239         }
 240
 241         return IRQ_HANDLED;
 242 }
 243
 244 static int shmob_drm_enable_vblank(struct drm_device *dev, int crtc)
 245 {
 246         struct shmob_drm_device *sdev = dev->dev_private;
 247
 248         shmob_drm_crtc_enable_vblank(sdev, true);
 249
 250         return 0;
 251 }
 252
 253 static void shmob_drm_disable_vblank(struct drm_device *dev, int crtc)
 254 {
 255         struct shmob_drm_device *sdev = dev->dev_private;
 256
 257         shmob_drm_crtc_enable_vblank(sdev, false);
 258 }
 259
 260 static const struct file_operations shmob_drm_fops = {
 261         .owner          = THIS_MODULE,
 262         .open           = drm_open,
 263         .release        = drm_release,
 264         .unlocked_ioctl = drm_ioctl,
 265 #ifdef CONFIG_COMPAT
 266         .compat_ioctl   = drm_compat_ioctl,
 267 #endif
 268         .poll           = drm_poll,
 269         .read           = drm_read,
 270         .fasync         = drm_fasync,
 271         .llseek         = no_llseek,
 272         .mmap           = drm_gem_cma_mmap,
 273 };
 274
 275 static struct drm_driver shmob_drm_driver = {
 276         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET,
 277         .load                   = shmob_drm_load,
 278         .unload                 = shmob_drm_unload,
 279         .preclose               = shmob_drm_preclose,
 280         .irq_handler            = shmob_drm_irq,
 281         .get_vblank_counter     = drm_vblank_count,
 282         .enable_vblank          = shmob_drm_enable_vblank,
 283         .disable_vblank         = shmob_drm_disable_vblank,
 284         .gem_free_object        = drm_gem_cma_free_object,
 285         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 286         .dumb_create            = drm_gem_cma_dumb_create,
 287         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 288         .dumb_destroy           = drm_gem_cma_dumb_destroy,
 289         .fops                   = &shmob_drm_fops,
 290         .name                   = "shmob-drm",
 291         .desc                   = "Renesas SH Mobile DRM",
 292         .date                   = "20120424",
 293         .major                  = 1,
 294         .minor                  = 0,
 295 };
 296
 297 /* -----------------------------------------------------------------------------
 298  * Power management
 299  */
 300
 301 #if CONFIG_PM_SLEEP
 302 static int shmob_drm_pm_suspend(struct device *dev)
 303 {
 304         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 305
 306         drm_kms_helper_poll_disable(sdev->ddev);
 307         shmob_drm_crtc_suspend(&sdev->crtc);
 308
 309         return 0;
 310 }
 311
 312 static int shmob_drm_pm_resume(struct device *dev)
 313 {
 314         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 315
 316         mutex_lock(&sdev->ddev->mode_config.mutex);
 317         shmob_drm_crtc_resume(&sdev->crtc);
 318         mutex_unlock(&sdev->ddev->mode_config.mutex);
 319
 320         drm_kms_helper_poll_enable(sdev->ddev);
 321         return 0;
 322 }
 323 #endif
 324
 325 static const struct dev_pm_ops shmob_drm_pm_ops = {
 326         SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
 327 };
 328
 329 /* -----------------------------------------------------------------------------
 330  * Platform driver
 331  */
 332
 333 static int __devinit shmob_drm_probe(struct platform_device *pdev)
 334 {
 335         return drm_platform_init(&shmob_drm_driver, pdev);
 336 }
 337
 338 static int __devexit shmob_drm_remove(struct platform_device *pdev)
 339 {
 340         drm_platform_exit(&shmob_drm_driver, pdev);
 341
 342         return 0;
 343 }
 344
 345 static struct platform_driver shmob_drm_platform_driver = {
 346         .probe          = shmob_drm_probe,
 347         .remove         = __devexit_p(shmob_drm_remove),
 348         .driver         = {
 349                 .owner  = THIS_MODULE,
 350                 .name   = "shmob-drm",
 351                 .pm     = &shmob_drm_pm_ops,
 352         },
 353 };
 354
 355 module_platform_driver(shmob_drm_platform_driver);
 356
 357 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 358 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
 359 MODULE_LICENSE("GPL");