Thierry Reding | d8f4a9e | 2012-11-15 21:28:22 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 Avionic Design GmbH |
| 3 | * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/clk.h> |
| 11 | #include <linux/err.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/of.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | |
| 16 | #include "drm.h" |
| 17 | |
| 18 | struct host1x_drm_client { |
| 19 | struct host1x_client *client; |
| 20 | struct device_node *np; |
| 21 | struct list_head list; |
| 22 | }; |
| 23 | |
| 24 | static int host1x_add_drm_client(struct host1x *host1x, struct device_node *np) |
| 25 | { |
| 26 | struct host1x_drm_client *client; |
| 27 | |
| 28 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
| 29 | if (!client) |
| 30 | return -ENOMEM; |
| 31 | |
| 32 | INIT_LIST_HEAD(&client->list); |
| 33 | client->np = of_node_get(np); |
| 34 | |
| 35 | list_add_tail(&client->list, &host1x->drm_clients); |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | static int host1x_activate_drm_client(struct host1x *host1x, |
| 41 | struct host1x_drm_client *drm, |
| 42 | struct host1x_client *client) |
| 43 | { |
| 44 | mutex_lock(&host1x->drm_clients_lock); |
| 45 | list_del_init(&drm->list); |
| 46 | list_add_tail(&drm->list, &host1x->drm_active); |
| 47 | drm->client = client; |
| 48 | mutex_unlock(&host1x->drm_clients_lock); |
| 49 | |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | static int host1x_remove_drm_client(struct host1x *host1x, |
| 54 | struct host1x_drm_client *client) |
| 55 | { |
| 56 | mutex_lock(&host1x->drm_clients_lock); |
| 57 | list_del_init(&client->list); |
| 58 | mutex_unlock(&host1x->drm_clients_lock); |
| 59 | |
| 60 | of_node_put(client->np); |
| 61 | kfree(client); |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static int host1x_parse_dt(struct host1x *host1x) |
| 67 | { |
| 68 | static const char * const compat[] = { |
| 69 | "nvidia,tegra20-dc", |
Thierry Reding | edec4af | 2012-11-15 21:28:23 +0000 | [diff] [blame] | 70 | "nvidia,tegra20-hdmi", |
Thierry Reding | 219e815 | 2012-11-21 09:50:41 +0100 | [diff] [blame] | 71 | "nvidia,tegra30-dc", |
| 72 | "nvidia,tegra30-hdmi", |
Thierry Reding | d8f4a9e | 2012-11-15 21:28:22 +0000 | [diff] [blame] | 73 | }; |
| 74 | unsigned int i; |
| 75 | int err; |
| 76 | |
| 77 | for (i = 0; i < ARRAY_SIZE(compat); i++) { |
| 78 | struct device_node *np; |
| 79 | |
| 80 | for_each_child_of_node(host1x->dev->of_node, np) { |
| 81 | if (of_device_is_compatible(np, compat[i]) && |
| 82 | of_device_is_available(np)) { |
| 83 | err = host1x_add_drm_client(host1x, np); |
| 84 | if (err < 0) |
| 85 | return err; |
| 86 | } |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static int tegra_host1x_probe(struct platform_device *pdev) |
| 94 | { |
| 95 | struct host1x *host1x; |
| 96 | struct resource *regs; |
| 97 | int err; |
| 98 | |
| 99 | host1x = devm_kzalloc(&pdev->dev, sizeof(*host1x), GFP_KERNEL); |
| 100 | if (!host1x) |
| 101 | return -ENOMEM; |
| 102 | |
| 103 | mutex_init(&host1x->drm_clients_lock); |
| 104 | INIT_LIST_HEAD(&host1x->drm_clients); |
| 105 | INIT_LIST_HEAD(&host1x->drm_active); |
| 106 | mutex_init(&host1x->clients_lock); |
| 107 | INIT_LIST_HEAD(&host1x->clients); |
| 108 | host1x->dev = &pdev->dev; |
| 109 | |
| 110 | err = host1x_parse_dt(host1x); |
| 111 | if (err < 0) { |
| 112 | dev_err(&pdev->dev, "failed to parse DT: %d\n", err); |
| 113 | return err; |
| 114 | } |
| 115 | |
| 116 | host1x->clk = devm_clk_get(&pdev->dev, NULL); |
| 117 | if (IS_ERR(host1x->clk)) |
| 118 | return PTR_ERR(host1x->clk); |
| 119 | |
| 120 | err = clk_prepare_enable(host1x->clk); |
| 121 | if (err < 0) |
| 122 | return err; |
| 123 | |
| 124 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 125 | if (!regs) { |
| 126 | err = -ENXIO; |
| 127 | goto err; |
| 128 | } |
| 129 | |
| 130 | err = platform_get_irq(pdev, 0); |
| 131 | if (err < 0) |
| 132 | goto err; |
| 133 | |
| 134 | host1x->syncpt = err; |
| 135 | |
| 136 | err = platform_get_irq(pdev, 1); |
| 137 | if (err < 0) |
| 138 | goto err; |
| 139 | |
| 140 | host1x->irq = err; |
| 141 | |
Thierry Reding | d4ed602 | 2013-01-21 11:09:02 +0100 | [diff] [blame] | 142 | host1x->regs = devm_ioremap_resource(&pdev->dev, regs); |
| 143 | if (IS_ERR(host1x->regs)) { |
| 144 | err = PTR_ERR(host1x->regs); |
Thierry Reding | d8f4a9e | 2012-11-15 21:28:22 +0000 | [diff] [blame] | 145 | goto err; |
| 146 | } |
| 147 | |
| 148 | platform_set_drvdata(pdev, host1x); |
| 149 | |
| 150 | return 0; |
| 151 | |
| 152 | err: |
| 153 | clk_disable_unprepare(host1x->clk); |
| 154 | return err; |
| 155 | } |
| 156 | |
| 157 | static int tegra_host1x_remove(struct platform_device *pdev) |
| 158 | { |
| 159 | struct host1x *host1x = platform_get_drvdata(pdev); |
| 160 | |
| 161 | clk_disable_unprepare(host1x->clk); |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | int host1x_drm_init(struct host1x *host1x, struct drm_device *drm) |
| 167 | { |
| 168 | struct host1x_client *client; |
| 169 | |
| 170 | mutex_lock(&host1x->clients_lock); |
| 171 | |
| 172 | list_for_each_entry(client, &host1x->clients, list) { |
| 173 | if (client->ops && client->ops->drm_init) { |
| 174 | int err = client->ops->drm_init(client, drm); |
| 175 | if (err < 0) { |
| 176 | dev_err(host1x->dev, |
| 177 | "DRM setup failed for %s: %d\n", |
| 178 | dev_name(client->dev), err); |
| 179 | return err; |
| 180 | } |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | mutex_unlock(&host1x->clients_lock); |
| 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | int host1x_drm_exit(struct host1x *host1x) |
| 190 | { |
| 191 | struct platform_device *pdev = to_platform_device(host1x->dev); |
| 192 | struct host1x_client *client; |
| 193 | |
| 194 | if (!host1x->drm) |
| 195 | return 0; |
| 196 | |
| 197 | mutex_lock(&host1x->clients_lock); |
| 198 | |
| 199 | list_for_each_entry_reverse(client, &host1x->clients, list) { |
| 200 | if (client->ops && client->ops->drm_exit) { |
| 201 | int err = client->ops->drm_exit(client); |
| 202 | if (err < 0) { |
| 203 | dev_err(host1x->dev, |
| 204 | "DRM cleanup failed for %s: %d\n", |
| 205 | dev_name(client->dev), err); |
| 206 | return err; |
| 207 | } |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | mutex_unlock(&host1x->clients_lock); |
| 212 | |
| 213 | drm_platform_exit(&tegra_drm_driver, pdev); |
| 214 | host1x->drm = NULL; |
| 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | int host1x_register_client(struct host1x *host1x, struct host1x_client *client) |
| 220 | { |
| 221 | struct host1x_drm_client *drm, *tmp; |
| 222 | int err; |
| 223 | |
| 224 | mutex_lock(&host1x->clients_lock); |
| 225 | list_add_tail(&client->list, &host1x->clients); |
| 226 | mutex_unlock(&host1x->clients_lock); |
| 227 | |
| 228 | list_for_each_entry_safe(drm, tmp, &host1x->drm_clients, list) |
| 229 | if (drm->np == client->dev->of_node) |
| 230 | host1x_activate_drm_client(host1x, drm, client); |
| 231 | |
| 232 | if (list_empty(&host1x->drm_clients)) { |
| 233 | struct platform_device *pdev = to_platform_device(host1x->dev); |
| 234 | |
| 235 | err = drm_platform_init(&tegra_drm_driver, pdev); |
| 236 | if (err < 0) { |
| 237 | dev_err(host1x->dev, "drm_platform_init(): %d\n", err); |
| 238 | return err; |
| 239 | } |
| 240 | } |
| 241 | |
Lucas Stach | 4026bfb | 2012-12-19 21:38:53 +0000 | [diff] [blame] | 242 | client->host1x = host1x; |
| 243 | |
Thierry Reding | d8f4a9e | 2012-11-15 21:28:22 +0000 | [diff] [blame] | 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | int host1x_unregister_client(struct host1x *host1x, |
| 248 | struct host1x_client *client) |
| 249 | { |
| 250 | struct host1x_drm_client *drm, *tmp; |
| 251 | int err; |
| 252 | |
| 253 | list_for_each_entry_safe(drm, tmp, &host1x->drm_active, list) { |
| 254 | if (drm->client == client) { |
| 255 | err = host1x_drm_exit(host1x); |
| 256 | if (err < 0) { |
| 257 | dev_err(host1x->dev, "host1x_drm_exit(): %d\n", |
| 258 | err); |
| 259 | return err; |
| 260 | } |
| 261 | |
| 262 | host1x_remove_drm_client(host1x, drm); |
| 263 | break; |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | mutex_lock(&host1x->clients_lock); |
| 268 | list_del_init(&client->list); |
| 269 | mutex_unlock(&host1x->clients_lock); |
| 270 | |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | static struct of_device_id tegra_host1x_of_match[] = { |
Thierry Reding | 219e815 | 2012-11-21 09:50:41 +0100 | [diff] [blame] | 275 | { .compatible = "nvidia,tegra30-host1x", }, |
Thierry Reding | d8f4a9e | 2012-11-15 21:28:22 +0000 | [diff] [blame] | 276 | { .compatible = "nvidia,tegra20-host1x", }, |
| 277 | { }, |
| 278 | }; |
| 279 | MODULE_DEVICE_TABLE(of, tegra_host1x_of_match); |
| 280 | |
| 281 | struct platform_driver tegra_host1x_driver = { |
| 282 | .driver = { |
| 283 | .name = "tegra-host1x", |
| 284 | .owner = THIS_MODULE, |
| 285 | .of_match_table = tegra_host1x_of_match, |
| 286 | }, |
| 287 | .probe = tegra_host1x_probe, |
| 288 | .remove = tegra_host1x_remove, |
| 289 | }; |
| 290 | |
| 291 | static int __init tegra_host1x_init(void) |
| 292 | { |
| 293 | int err; |
| 294 | |
| 295 | err = platform_driver_register(&tegra_host1x_driver); |
| 296 | if (err < 0) |
| 297 | return err; |
| 298 | |
| 299 | err = platform_driver_register(&tegra_dc_driver); |
| 300 | if (err < 0) |
| 301 | goto unregister_host1x; |
| 302 | |
Thierry Reding | edec4af | 2012-11-15 21:28:23 +0000 | [diff] [blame] | 303 | err = platform_driver_register(&tegra_hdmi_driver); |
| 304 | if (err < 0) |
| 305 | goto unregister_dc; |
| 306 | |
Thierry Reding | d8f4a9e | 2012-11-15 21:28:22 +0000 | [diff] [blame] | 307 | return 0; |
| 308 | |
Thierry Reding | edec4af | 2012-11-15 21:28:23 +0000 | [diff] [blame] | 309 | unregister_dc: |
| 310 | platform_driver_unregister(&tegra_dc_driver); |
Thierry Reding | d8f4a9e | 2012-11-15 21:28:22 +0000 | [diff] [blame] | 311 | unregister_host1x: |
| 312 | platform_driver_unregister(&tegra_host1x_driver); |
| 313 | return err; |
| 314 | } |
| 315 | module_init(tegra_host1x_init); |
| 316 | |
| 317 | static void __exit tegra_host1x_exit(void) |
| 318 | { |
Thierry Reding | edec4af | 2012-11-15 21:28:23 +0000 | [diff] [blame] | 319 | platform_driver_unregister(&tegra_hdmi_driver); |
Thierry Reding | d8f4a9e | 2012-11-15 21:28:22 +0000 | [diff] [blame] | 320 | platform_driver_unregister(&tegra_dc_driver); |
| 321 | platform_driver_unregister(&tegra_host1x_driver); |
| 322 | } |
| 323 | module_exit(tegra_host1x_exit); |
| 324 | |
| 325 | MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>"); |
| 326 | MODULE_DESCRIPTION("NVIDIA Tegra DRM driver"); |
| 327 | MODULE_LICENSE("GPL"); |