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