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 DEFINE_DRM_GEM_CMA_FOPS(shmob_drm_fops);
 131
 132 static struct drm_driver shmob_drm_driver = {
 133         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
 134                                 | DRIVER_PRIME,
 135         .irq_handler            = shmob_drm_irq,
 136         .gem_free_object_unlocked = drm_gem_cma_free_object,
 137         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 138         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 139         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 140         .gem_prime_import       = drm_gem_prime_import,
 141         .gem_prime_export       = drm_gem_prime_export,
 142         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 143         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 144         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 145         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 146         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 147         .dumb_create            = drm_gem_cma_dumb_create,
 148         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 149         .dumb_destroy           = drm_gem_dumb_destroy,
 150         .fops                   = &shmob_drm_fops,
 151         .name                   = "shmob-drm",
 152         .desc                   = "Renesas SH Mobile DRM",
 153         .date                   = "20120424",
 154         .major                  = 1,
 155         .minor                  = 0,
 156 };
 157
 158 /* -----------------------------------------------------------------------------
 159  * Power management
 160  */
 161
 162 #ifdef CONFIG_PM_SLEEP
 163 static int shmob_drm_pm_suspend(struct device *dev)
 164 {
 165         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 166
 167         drm_kms_helper_poll_disable(sdev->ddev);
 168         shmob_drm_crtc_suspend(&sdev->crtc);
 169
 170         return 0;
 171 }
 172
 173 static int shmob_drm_pm_resume(struct device *dev)
 174 {
 175         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 176
 177         drm_modeset_lock_all(sdev->ddev);
 178         shmob_drm_crtc_resume(&sdev->crtc);
 179         drm_modeset_unlock_all(sdev->ddev);
 180
 181         drm_kms_helper_poll_enable(sdev->ddev);
 182         return 0;
 183 }
 184 #endif
 185
 186 static const struct dev_pm_ops shmob_drm_pm_ops = {
 187         SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
 188 };
 189
 190 /* -----------------------------------------------------------------------------
 191  * Platform driver
 192  */
 193
 194 static int shmob_drm_remove(struct platform_device *pdev)
 195 {
 196         struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
 197         struct drm_device *ddev = sdev->ddev;
 198
 199         drm_dev_unregister(ddev);
 200         drm_kms_helper_poll_fini(ddev);
 201         drm_mode_config_cleanup(ddev);
 202         drm_irq_uninstall(ddev);
 203         drm_dev_unref(ddev);
 204
 205         return 0;
 206 }
 207
 208 static int shmob_drm_probe(struct platform_device *pdev)
 209 {
 210         struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
 211         struct shmob_drm_device *sdev;
 212         struct drm_device *ddev;
 213         struct resource *res;
 214         unsigned int i;
 215         int ret;
 216
 217         if (pdata == NULL) {
 218                 dev_err(&pdev->dev, "no platform data\n");
 219                 return -EINVAL;
 220         }
 221
 222         /*
 223          * Allocate and initialize the driver private data, I/O resources and
 224          * clocks.
 225          */
 226         sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
 227         if (sdev == NULL)
 228                 return -ENOMEM;
 229
 230         sdev->dev = &pdev->dev;
 231         sdev->pdata = pdata;
 232         spin_lock_init(&sdev->irq_lock);
 233
 234         platform_set_drvdata(pdev, sdev);
 235
 236         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 237         sdev->mmio = devm_ioremap_resource(&pdev->dev, res);
 238         if (sdev->mmio == NULL)
 239                 return -ENOMEM;
 240
 241         ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
 242         if (ret < 0)
 243                 return ret;
 244
 245         ret = shmob_drm_init_interface(sdev);
 246         if (ret < 0)
 247                 return ret;
 248
 249         /* Allocate and initialize the DRM device. */
 250         ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev);
 251         if (IS_ERR(ddev))
 252                 return PTR_ERR(ddev);
 253
 254         sdev->ddev = ddev;
 255         ddev->dev_private = sdev;
 256
 257         ret = shmob_drm_modeset_init(sdev);
 258         if (ret < 0) {
 259                 dev_err(&pdev->dev, "failed to initialize mode setting\n");
 260                 goto err_free_drm_dev;
 261         }
 262
 263         for (i = 0; i < 4; ++i) {
 264                 ret = shmob_drm_plane_create(sdev, i);
 265                 if (ret < 0) {
 266                         dev_err(&pdev->dev, "failed to create plane %u\n", i);
 267                         goto err_modeset_cleanup;
 268                 }
 269         }
 270
 271         ret = drm_vblank_init(ddev, 1);
 272         if (ret < 0) {
 273                 dev_err(&pdev->dev, "failed to initialize vblank\n");
 274                 goto err_modeset_cleanup;
 275         }
 276
 277         ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
 278         if (ret < 0) {
 279                 dev_err(&pdev->dev, "failed to install IRQ handler\n");
 280                 goto err_vblank_cleanup;
 281         }
 282
 283         /*
 284          * Register the DRM device with the core and the connectors with
 285          * sysfs.
 286          */
 287         ret = drm_dev_register(ddev, 0);
 288         if (ret < 0)
 289                 goto err_irq_uninstall;
 290
 291         return 0;
 292
 293 err_irq_uninstall:
 294         drm_irq_uninstall(ddev);
 295 err_vblank_cleanup:
 296         drm_vblank_cleanup(ddev);
 297 err_modeset_cleanup:
 298         drm_kms_helper_poll_fini(ddev);
 299         drm_mode_config_cleanup(ddev);
 300 err_free_drm_dev:
 301         drm_dev_unref(ddev);
 302
 303         return ret;
 304 }
 305
 306 static struct platform_driver shmob_drm_platform_driver = {
 307         .probe          = shmob_drm_probe,
 308         .remove         = shmob_drm_remove,
 309         .driver         = {
 310                 .name   = "shmob-drm",
 311                 .pm     = &shmob_drm_pm_ops,
 312         },
 313 };
 314
 315 module_platform_driver(shmob_drm_platform_driver);
 316
 317 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 318 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
 319 MODULE_LICENSE("GPL");