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