drivers/gpu/drm/shmobile/shmob_drm_drv.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * shmob_drm_drv.c  --  SH Mobile DRM driver
   4  *
   5  * Copyright (C) 2012 Renesas Electronics Corporation
   6  *
   7  * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   8  */
   9
  10 #include <linux/clk.h>
  11 #include <linux/io.h>
  12 #include <linux/mm.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm.h>
  16 #include <linux/slab.h>
  17
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_drv.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_module.h>
  22 #include <drm/drm_probe_helper.h>
  23 #include <drm/drm_vblank.h>
  24
  25 #include "shmob_drm_drv.h"
  26 #include "shmob_drm_kms.h"
  27 #include "shmob_drm_plane.h"
  28 #include "shmob_drm_regs.h"
  29
  30 /* -----------------------------------------------------------------------------
  31  * Hardware initialization
  32  */
  33
  34 static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
  35 {
  36         static const u32 ldmt1r[] = {
  37                 [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
  38                 [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
  39                 [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
  40                 [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
  41                 [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
  42                 [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
  43                 [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
  44                 [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
  45                 [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
  46                 [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
  47                 [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
  48                 [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
  49                 [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
  50                 [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
  51                 [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
  52                 [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
  53                 [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
  54                 [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
  55                 [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
  56         };
  57
  58         if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
  59                 dev_err(sdev->dev, "invalid interface type %u\n",
  60                         sdev->pdata->iface.interface);
  61                 return -EINVAL;
  62         }
  63
  64         sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
  65         return 0;
  66 }
  67
  68 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
  69                                             enum shmob_drm_clk_source clksrc)
  70 {
  71         struct clk *clk;
  72         char *clkname;
  73
  74         switch (clksrc) {
  75         case SHMOB_DRM_CLK_BUS:
  76                 clkname = "bus_clk";
  77                 sdev->lddckr = LDDCKR_ICKSEL_BUS;
  78                 break;
  79         case SHMOB_DRM_CLK_PERIPHERAL:
  80                 clkname = "peripheral_clk";
  81                 sdev->lddckr = LDDCKR_ICKSEL_MIPI;
  82                 break;
  83         case SHMOB_DRM_CLK_EXTERNAL:
  84                 clkname = NULL;
  85                 sdev->lddckr = LDDCKR_ICKSEL_HDMI;
  86                 break;
  87         default:
  88                 return -EINVAL;
  89         }
  90
  91         clk = devm_clk_get(sdev->dev, clkname);
  92         if (IS_ERR(clk)) {
  93                 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
  94                 return PTR_ERR(clk);
  95         }
  96
  97         sdev->clock = clk;
  98         return 0;
  99 }
 100
 101 /* -----------------------------------------------------------------------------
 102  * DRM operations
 103  */
 104
 105 static irqreturn_t shmob_drm_irq(int irq, void *arg)
 106 {
 107         struct drm_device *dev = arg;
 108         struct shmob_drm_device *sdev = dev->dev_private;
 109         unsigned long flags;
 110         u32 status;
 111
 112         /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
 113          * bits in the same register is really brain-dead design and requires
 114          * taking a spinlock.
 115          */
 116         spin_lock_irqsave(&sdev->irq_lock, flags);
 117         status = lcdc_read(sdev, LDINTR);
 118         lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
 119         spin_unlock_irqrestore(&sdev->irq_lock, flags);
 120
 121         if (status & LDINTR_VES) {
 122                 drm_handle_vblank(dev, 0);
 123                 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
 124         }
 125
 126         return IRQ_HANDLED;
 127 }
 128
 129 DEFINE_DRM_GEM_CMA_FOPS(shmob_drm_fops);
 130
 131 static const struct drm_driver shmob_drm_driver = {
 132         .driver_features        = DRIVER_GEM | DRIVER_MODESET,
 133         DRM_GEM_CMA_DRIVER_OPS,
 134         .fops                   = &shmob_drm_fops,
 135         .name                   = "shmob-drm",
 136         .desc                   = "Renesas SH Mobile DRM",
 137         .date                   = "20120424",
 138         .major                  = 1,
 139         .minor                  = 0,
 140 };
 141
 142 /* -----------------------------------------------------------------------------
 143  * Power management
 144  */
 145
 146 #ifdef CONFIG_PM_SLEEP
 147 static int shmob_drm_pm_suspend(struct device *dev)
 148 {
 149         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 150
 151         drm_kms_helper_poll_disable(sdev->ddev);
 152         shmob_drm_crtc_suspend(&sdev->crtc);
 153
 154         return 0;
 155 }
 156
 157 static int shmob_drm_pm_resume(struct device *dev)
 158 {
 159         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 160
 161         drm_modeset_lock_all(sdev->ddev);
 162         shmob_drm_crtc_resume(&sdev->crtc);
 163         drm_modeset_unlock_all(sdev->ddev);
 164
 165         drm_kms_helper_poll_enable(sdev->ddev);
 166         return 0;
 167 }
 168 #endif
 169
 170 static const struct dev_pm_ops shmob_drm_pm_ops = {
 171         SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
 172 };
 173
 174 /* -----------------------------------------------------------------------------
 175  * Platform driver
 176  */
 177
 178 static int shmob_drm_remove(struct platform_device *pdev)
 179 {
 180         struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
 181         struct drm_device *ddev = sdev->ddev;
 182
 183         drm_dev_unregister(ddev);
 184         drm_kms_helper_poll_fini(ddev);
 185         free_irq(sdev->irq, ddev);
 186         drm_dev_put(ddev);
 187
 188         return 0;
 189 }
 190
 191 static int shmob_drm_probe(struct platform_device *pdev)
 192 {
 193         struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
 194         struct shmob_drm_device *sdev;
 195         struct drm_device *ddev;
 196         unsigned int i;
 197         int ret;
 198
 199         if (pdata == NULL) {
 200                 dev_err(&pdev->dev, "no platform data\n");
 201                 return -EINVAL;
 202         }
 203
 204         /*
 205          * Allocate and initialize the driver private data, I/O resources and
 206          * clocks.
 207          */
 208         sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
 209         if (sdev == NULL)
 210                 return -ENOMEM;
 211
 212         sdev->dev = &pdev->dev;
 213         sdev->pdata = pdata;
 214         spin_lock_init(&sdev->irq_lock);
 215
 216         platform_set_drvdata(pdev, sdev);
 217
 218         sdev->mmio = devm_platform_ioremap_resource(pdev, 0);
 219         if (IS_ERR(sdev->mmio))
 220                 return PTR_ERR(sdev->mmio);
 221
 222         ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
 223         if (ret < 0)
 224                 return ret;
 225
 226         ret = shmob_drm_init_interface(sdev);
 227         if (ret < 0)
 228                 return ret;
 229
 230         /* Allocate and initialize the DRM device. */
 231         ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev);
 232         if (IS_ERR(ddev))
 233                 return PTR_ERR(ddev);
 234
 235         sdev->ddev = ddev;
 236         ddev->dev_private = sdev;
 237
 238         ret = shmob_drm_modeset_init(sdev);
 239         if (ret < 0) {
 240                 dev_err(&pdev->dev, "failed to initialize mode setting\n");
 241                 goto err_free_drm_dev;
 242         }
 243
 244         for (i = 0; i < 4; ++i) {
 245                 ret = shmob_drm_plane_create(sdev, i);
 246                 if (ret < 0) {
 247                         dev_err(&pdev->dev, "failed to create plane %u\n", i);
 248                         goto err_modeset_cleanup;
 249                 }
 250         }
 251
 252         ret = drm_vblank_init(ddev, 1);
 253         if (ret < 0) {
 254                 dev_err(&pdev->dev, "failed to initialize vblank\n");
 255                 goto err_modeset_cleanup;
 256         }
 257
 258         ret = platform_get_irq(pdev, 0);
 259         if (ret < 0)
 260                 goto err_modeset_cleanup;
 261         sdev->irq = ret;
 262
 263         ret = request_irq(sdev->irq, shmob_drm_irq, 0, ddev->driver->name,
 264                           ddev);
 265         if (ret < 0) {
 266                 dev_err(&pdev->dev, "failed to install IRQ handler\n");
 267                 goto err_modeset_cleanup;
 268         }
 269
 270         /*
 271          * Register the DRM device with the core and the connectors with
 272          * sysfs.
 273          */
 274         ret = drm_dev_register(ddev, 0);
 275         if (ret < 0)
 276                 goto err_irq_uninstall;
 277
 278         return 0;
 279
 280 err_irq_uninstall:
 281         free_irq(sdev->irq, ddev);
 282 err_modeset_cleanup:
 283         drm_kms_helper_poll_fini(ddev);
 284 err_free_drm_dev:
 285         drm_dev_put(ddev);
 286
 287         return ret;
 288 }
 289
 290 static struct platform_driver shmob_drm_platform_driver = {
 291         .probe          = shmob_drm_probe,
 292         .remove         = shmob_drm_remove,
 293         .driver         = {
 294                 .name   = "shmob-drm",
 295                 .pm     = &shmob_drm_pm_ops,
 296         },
 297 };
 298
 299 drm_module_platform_driver(shmob_drm_platform_driver);
 300
 301 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 302 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
 303 MODULE_LICENSE("GPL");