drivers/gpu/drm/arc/arcpgu_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ARC PGU DRM driver.
   4  *
   5  * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <drm/drm_atomic_helper.h>
  10 #include <drm/drm_debugfs.h>
  11 #include <drm/drm_device.h>
  12 #include <drm/drm_drv.h>
  13 #include <drm/drm_fb_cma_helper.h>
  14 #include <drm/drm_fb_helper.h>
  15 #include <drm/drm_gem_cma_helper.h>
  16 #include <drm/drm_gem_framebuffer_helper.h>
  17 #include <drm/drm_probe_helper.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/module.h>
  20 #include <linux/of_reserved_mem.h>
  21 #include <linux/platform_device.h>
  22
  23 #include "arcpgu.h"
  24 #include "arcpgu_regs.h"
  25
  26 static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
  27         .fb_create  = drm_gem_fb_create,
  28         .atomic_check = drm_atomic_helper_check,
  29         .atomic_commit = drm_atomic_helper_commit,
  30 };
  31
  32 static void arcpgu_setup_mode_config(struct drm_device *drm)
  33 {
  34         drm_mode_config_init(drm);
  35         drm->mode_config.min_width = 0;
  36         drm->mode_config.min_height = 0;
  37         drm->mode_config.max_width = 1920;
  38         drm->mode_config.max_height = 1080;
  39         drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
  40 }
  41
  42 DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
  43
  44 static int arcpgu_load(struct drm_device *drm)
  45 {
  46         struct platform_device *pdev = to_platform_device(drm->dev);
  47         struct arcpgu_drm_private *arcpgu;
  48         struct device_node *encoder_node;
  49         struct resource *res;
  50         int ret;
  51
  52         arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
  53         if (arcpgu == NULL)
  54                 return -ENOMEM;
  55
  56         drm->dev_private = arcpgu;
  57
  58         arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
  59         if (IS_ERR(arcpgu->clk))
  60                 return PTR_ERR(arcpgu->clk);
  61
  62         arcpgu_setup_mode_config(drm);
  63
  64         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  65         arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
  66         if (IS_ERR(arcpgu->regs))
  67                 return PTR_ERR(arcpgu->regs);
  68
  69         dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
  70                  arc_pgu_read(arcpgu, ARCPGU_REG_ID));
  71
  72         /* Get the optional framebuffer memory resource */
  73         ret = of_reserved_mem_device_init(drm->dev);
  74         if (ret && ret != -ENODEV)
  75                 return ret;
  76
  77         if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
  78                 return -ENODEV;
  79
  80         if (arc_pgu_setup_crtc(drm) < 0)
  81                 return -ENODEV;
  82
  83         /* find the encoder node and initialize it */
  84         encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
  85         if (encoder_node) {
  86                 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
  87                 of_node_put(encoder_node);
  88                 if (ret < 0)
  89                         return ret;
  90         } else {
  91                 ret = arcpgu_drm_sim_init(drm, NULL);
  92                 if (ret < 0)
  93                         return ret;
  94         }
  95
  96         drm_mode_config_reset(drm);
  97         drm_kms_helper_poll_init(drm);
  98
  99         platform_set_drvdata(pdev, drm);
 100         return 0;
 101 }
 102
 103 static int arcpgu_unload(struct drm_device *drm)
 104 {
 105         drm_kms_helper_poll_fini(drm);
 106         drm_atomic_helper_shutdown(drm);
 107         drm_mode_config_cleanup(drm);
 108
 109         return 0;
 110 }
 111
 112 #ifdef CONFIG_DEBUG_FS
 113 static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
 114 {
 115         struct drm_info_node *node = (struct drm_info_node *)m->private;
 116         struct drm_device *drm = node->minor->dev;
 117         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 118         unsigned long clkrate = clk_get_rate(arcpgu->clk);
 119         unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;
 120
 121         seq_printf(m, "hw  : %lu\n", clkrate);
 122         seq_printf(m, "mode: %lu\n", mode_clock);
 123         return 0;
 124 }
 125
 126 static struct drm_info_list arcpgu_debugfs_list[] = {
 127         { "clocks", arcpgu_show_pxlclock, 0 },
 128 };
 129
 130 static int arcpgu_debugfs_init(struct drm_minor *minor)
 131 {
 132         return drm_debugfs_create_files(arcpgu_debugfs_list,
 133                 ARRAY_SIZE(arcpgu_debugfs_list), minor->debugfs_root, minor);
 134 }
 135 #endif
 136
 137 static struct drm_driver arcpgu_drm_driver = {
 138         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 139         .name = "arcpgu",
 140         .desc = "ARC PGU Controller",
 141         .date = "20160219",
 142         .major = 1,
 143         .minor = 0,
 144         .patchlevel = 0,
 145         .fops = &arcpgu_drm_ops,
 146         .dumb_create = drm_gem_cma_dumb_create,
 147         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 148         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 149         .gem_free_object_unlocked = drm_gem_cma_free_object,
 150         .gem_print_info = drm_gem_cma_print_info,
 151         .gem_vm_ops = &drm_gem_cma_vm_ops,
 152         .gem_prime_export = drm_gem_prime_export,
 153         .gem_prime_import = drm_gem_prime_import,
 154         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 155         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 156         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 157         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 158         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 159 #ifdef CONFIG_DEBUG_FS
 160         .debugfs_init = arcpgu_debugfs_init,
 161 #endif
 162 };
 163
 164 static int arcpgu_probe(struct platform_device *pdev)
 165 {
 166         struct drm_device *drm;
 167         int ret;
 168
 169         drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
 170         if (IS_ERR(drm))
 171                 return PTR_ERR(drm);
 172
 173         ret = arcpgu_load(drm);
 174         if (ret)
 175                 goto err_unref;
 176
 177         ret = drm_dev_register(drm, 0);
 178         if (ret)
 179                 goto err_unload;
 180
 181         drm_fbdev_generic_setup(drm, 16);
 182
 183         return 0;
 184
 185 err_unload:
 186         arcpgu_unload(drm);
 187
 188 err_unref:
 189         drm_dev_put(drm);
 190
 191         return ret;
 192 }
 193
 194 static int arcpgu_remove(struct platform_device *pdev)
 195 {
 196         struct drm_device *drm = platform_get_drvdata(pdev);
 197
 198         drm_dev_unregister(drm);
 199         arcpgu_unload(drm);
 200         drm_dev_put(drm);
 201
 202         return 0;
 203 }
 204
 205 static const struct of_device_id arcpgu_of_table[] = {
 206         {.compatible = "snps,arcpgu"},
 207         {}
 208 };
 209
 210 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
 211
 212 static struct platform_driver arcpgu_platform_driver = {
 213         .probe = arcpgu_probe,
 214         .remove = arcpgu_remove,
 215         .driver = {
 216                    .name = "arcpgu",
 217                    .of_match_table = arcpgu_of_table,
 218                    },
 219 };
 220
 221 module_platform_driver(arcpgu_platform_driver);
 222
 223 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
 224 MODULE_DESCRIPTION("ARC PGU DRM driver");
 225 MODULE_LICENSE("GPL");