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/drmP.h>
  19 #include <drm/drm_crtc_helper.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_probe_helper.h>
  22
  23 #include "shmob_drm_drv.h"
  24 #include "shmob_drm_kms.h"
  25 #include "shmob_drm_plane.h"
  26 #include "shmob_drm_regs.h"
  27
  28 /* -----------------------------------------------------------------------------
  29  * Hardware initialization
  30  */
  31
  32 static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
  33 {
  34         static const u32 ldmt1r[] = {
  35                 [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
  36                 [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
  37                 [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
  38                 [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
  39                 [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
  40                 [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
  41                 [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
  42                 [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
  43                 [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
  44                 [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
  45                 [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
  46                 [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
  47                 [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
  48                 [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
  49                 [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
  50                 [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
  51                 [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
  52                 [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
  53                 [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
  54         };
  55
  56         if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
  57                 dev_err(sdev->dev, "invalid interface type %u\n",
  58                         sdev->pdata->iface.interface);
  59                 return -EINVAL;
  60         }
  61
  62         sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
  63         return 0;
  64 }
  65
  66 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
  67                                             enum shmob_drm_clk_source clksrc)
  68 {
  69         struct clk *clk;
  70         char *clkname;
  71
  72         switch (clksrc) {
  73         case SHMOB_DRM_CLK_BUS:
  74                 clkname = "bus_clk";
  75                 sdev->lddckr = LDDCKR_ICKSEL_BUS;
  76                 break;
  77         case SHMOB_DRM_CLK_PERIPHERAL:
  78                 clkname = "peripheral_clk";
  79                 sdev->lddckr = LDDCKR_ICKSEL_MIPI;
  80                 break;
  81         case SHMOB_DRM_CLK_EXTERNAL:
  82                 clkname = NULL;
  83                 sdev->lddckr = LDDCKR_ICKSEL_HDMI;
  84                 break;
  85         default:
  86                 return -EINVAL;
  87         }
  88
  89         clk = devm_clk_get(sdev->dev, clkname);
  90         if (IS_ERR(clk)) {
  91                 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
  92                 return PTR_ERR(clk);
  93         }
  94
  95         sdev->clock = clk;
  96         return 0;
  97 }
  98
  99 /* -----------------------------------------------------------------------------
 100  * DRM operations
 101  */
 102
 103 static irqreturn_t shmob_drm_irq(int irq, void *arg)
 104 {
 105         struct drm_device *dev = arg;
 106         struct shmob_drm_device *sdev = dev->dev_private;
 107         unsigned long flags;
 108         u32 status;
 109
 110         /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
 111          * bits in the same register is really brain-dead design and requires
 112          * taking a spinlock.
 113          */
 114         spin_lock_irqsave(&sdev->irq_lock, flags);
 115         status = lcdc_read(sdev, LDINTR);
 116         lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
 117         spin_unlock_irqrestore(&sdev->irq_lock, flags);
 118
 119         if (status & LDINTR_VES) {
 120                 drm_handle_vblank(dev, 0);
 121                 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
 122         }
 123
 124         return IRQ_HANDLED;
 125 }
 126
 127 DEFINE_DRM_GEM_CMA_FOPS(shmob_drm_fops);
 128
 129 static struct drm_driver shmob_drm_driver = {
 130         .driver_features        = DRIVER_GEM | DRIVER_MODESET,
 131         .irq_handler            = shmob_drm_irq,
 132         .gem_free_object_unlocked = drm_gem_cma_free_object,
 133         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 134         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 135         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 136         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 137         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 138         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 139         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 140         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 141         .dumb_create            = drm_gem_cma_dumb_create,
 142         .fops                   = &shmob_drm_fops,
 143         .name                   = "shmob-drm",
 144         .desc                   = "Renesas SH Mobile DRM",
 145         .date                   = "20120424",
 146         .major                  = 1,
 147         .minor                  = 0,
 148 };
 149
 150 /* -----------------------------------------------------------------------------
 151  * Power management
 152  */
 153
 154 #ifdef CONFIG_PM_SLEEP
 155 static int shmob_drm_pm_suspend(struct device *dev)
 156 {
 157         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 158
 159         drm_kms_helper_poll_disable(sdev->ddev);
 160         shmob_drm_crtc_suspend(&sdev->crtc);
 161
 162         return 0;
 163 }
 164
 165 static int shmob_drm_pm_resume(struct device *dev)
 166 {
 167         struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 168
 169         drm_modeset_lock_all(sdev->ddev);
 170         shmob_drm_crtc_resume(&sdev->crtc);
 171         drm_modeset_unlock_all(sdev->ddev);
 172
 173         drm_kms_helper_poll_enable(sdev->ddev);
 174         return 0;
 175 }
 176 #endif
 177
 178 static const struct dev_pm_ops shmob_drm_pm_ops = {
 179         SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
 180 };
 181
 182 /* -----------------------------------------------------------------------------
 183  * Platform driver
 184  */
 185
 186 static int shmob_drm_remove(struct platform_device *pdev)
 187 {
 188         struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
 189         struct drm_device *ddev = sdev->ddev;
 190
 191         drm_dev_unregister(ddev);
 192         drm_kms_helper_poll_fini(ddev);
 193         drm_mode_config_cleanup(ddev);
 194         drm_irq_uninstall(ddev);
 195         drm_dev_put(ddev);
 196
 197         return 0;
 198 }
 199
 200 static int shmob_drm_probe(struct platform_device *pdev)
 201 {
 202         struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
 203         struct shmob_drm_device *sdev;
 204         struct drm_device *ddev;
 205         struct resource *res;
 206         unsigned int i;
 207         int ret;
 208
 209         if (pdata == NULL) {
 210                 dev_err(&pdev->dev, "no platform data\n");
 211                 return -EINVAL;
 212         }
 213
 214         /*
 215          * Allocate and initialize the driver private data, I/O resources and
 216          * clocks.
 217          */
 218         sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
 219         if (sdev == NULL)
 220                 return -ENOMEM;
 221
 222         sdev->dev = &pdev->dev;
 223         sdev->pdata = pdata;
 224         spin_lock_init(&sdev->irq_lock);
 225
 226         platform_set_drvdata(pdev, sdev);
 227
 228         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 229         sdev->mmio = devm_ioremap_resource(&pdev->dev, res);
 230         if (IS_ERR(sdev->mmio))
 231                 return PTR_ERR(sdev->mmio);
 232
 233         ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
 234         if (ret < 0)
 235                 return ret;
 236
 237         ret = shmob_drm_init_interface(sdev);
 238         if (ret < 0)
 239                 return ret;
 240
 241         /* Allocate and initialize the DRM device. */
 242         ddev = drm_dev_alloc(&shmob_drm_driver, &pdev->dev);
 243         if (IS_ERR(ddev))
 244                 return PTR_ERR(ddev);
 245
 246         sdev->ddev = ddev;
 247         ddev->dev_private = sdev;
 248
 249         ret = shmob_drm_modeset_init(sdev);
 250         if (ret < 0) {
 251                 dev_err(&pdev->dev, "failed to initialize mode setting\n");
 252                 goto err_free_drm_dev;
 253         }
 254
 255         for (i = 0; i < 4; ++i) {
 256                 ret = shmob_drm_plane_create(sdev, i);
 257                 if (ret < 0) {
 258                         dev_err(&pdev->dev, "failed to create plane %u\n", i);
 259                         goto err_modeset_cleanup;
 260                 }
 261         }
 262
 263         ret = drm_vblank_init(ddev, 1);
 264         if (ret < 0) {
 265                 dev_err(&pdev->dev, "failed to initialize vblank\n");
 266                 goto err_modeset_cleanup;
 267         }
 268
 269         ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
 270         if (ret < 0) {
 271                 dev_err(&pdev->dev, "failed to install IRQ handler\n");
 272                 goto err_modeset_cleanup;
 273         }
 274
 275         /*
 276          * Register the DRM device with the core and the connectors with
 277          * sysfs.
 278          */
 279         ret = drm_dev_register(ddev, 0);
 280         if (ret < 0)
 281                 goto err_irq_uninstall;
 282
 283         return 0;
 284
 285 err_irq_uninstall:
 286         drm_irq_uninstall(ddev);
 287 err_modeset_cleanup:
 288         drm_kms_helper_poll_fini(ddev);
 289         drm_mode_config_cleanup(ddev);
 290 err_free_drm_dev:
 291         drm_dev_put(ddev);
 292
 293         return ret;
 294 }
 295
 296 static struct platform_driver shmob_drm_platform_driver = {
 297         .probe          = shmob_drm_probe,
 298         .remove         = shmob_drm_remove,
 299         .driver         = {
 300                 .name   = "shmob-drm",
 301                 .pm     = &shmob_drm_pm_ops,
 302         },
 303 };
 304
 305 module_platform_driver(shmob_drm_platform_driver);
 306
 307 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 308 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
 309 MODULE_LICENSE("GPL");