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