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