1 /*
2 * shmob_drm_drv.c -- SH Mobile DRM driver
3 *
4 * Copyright (C) 2012 Renesas Electronics Corporation
5 *
6 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/io.h>
16 #include <linux/mm.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
19 #include <linux/pm.h>
20 #include <linux/slab.h>
21
22 #include <drm/drmP.h>
23 #include <drm/drm_crtc_helper.h>
24 #include <drm/drm_gem_cma_helper.h>
25
26 #include "shmob_drm_crtc.h"
27 #include "shmob_drm_drv.h"
28 #include "shmob_drm_kms.h"
29 #include "shmob_drm_plane.h"
30 #include "shmob_drm_regs.h"
31
32 /* -----------------------------------------------------------------------------
33 * Hardware initialization
34 */
35
shmob_drm_init_interface(struct shmob_drm_device * sdev)36 static int shmob_drm_init_interface(struct shmob_drm_device *sdev)
37 {
38 static const u32 ldmt1r[] = {
39 [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
40 [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
41 [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
42 [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
43 [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
44 [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
45 [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
46 [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
47 [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
48 [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
49 [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
50 [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
51 [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
52 [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
53 [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
54 [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
55 [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
56 [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
57 [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
58 };
59
60 if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
61 dev_err(sdev->dev, "invalid interface type %u\n",
62 sdev->pdata->iface.interface);
63 return -EINVAL;
64 }
65
66 sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
67 return 0;
68 }
69
shmob_drm_setup_clocks(struct shmob_drm_device * sdev,enum shmob_drm_clk_source clksrc)70 static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
71 enum shmob_drm_clk_source clksrc)
72 {
73 struct clk *clk;
74 char *clkname;
75
76 switch (clksrc) {
77 case SHMOB_DRM_CLK_BUS:
78 clkname = "bus_clk";
79 sdev->lddckr = LDDCKR_ICKSEL_BUS;
80 break;
81 case SHMOB_DRM_CLK_PERIPHERAL:
82 clkname = "peripheral_clk";
83 sdev->lddckr = LDDCKR_ICKSEL_MIPI;
84 break;
85 case SHMOB_DRM_CLK_EXTERNAL:
86 clkname = NULL;
87 sdev->lddckr = LDDCKR_ICKSEL_HDMI;
88 break;
89 default:
90 return -EINVAL;
91 }
92
93 clk = devm_clk_get(sdev->dev, clkname);
94 if (IS_ERR(clk)) {
95 dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
96 return PTR_ERR(clk);
97 }
98
99 sdev->clock = clk;
100 return 0;
101 }
102
103 /* -----------------------------------------------------------------------------
104 * DRM operations
105 */
106
shmob_drm_unload(struct drm_device * dev)107 static int shmob_drm_unload(struct drm_device *dev)
108 {
109 drm_kms_helper_poll_fini(dev);
110 drm_mode_config_cleanup(dev);
111 drm_vblank_cleanup(dev);
112 drm_irq_uninstall(dev);
113
114 dev->dev_private = NULL;
115
116 return 0;
117 }
118
shmob_drm_load(struct drm_device * dev,unsigned long flags)119 static int shmob_drm_load(struct drm_device *dev, unsigned long flags)
120 {
121 struct shmob_drm_platform_data *pdata = dev->dev->platform_data;
122 struct platform_device *pdev = dev->platformdev;
123 struct shmob_drm_device *sdev;
124 struct resource *res;
125 unsigned int i;
126 int ret;
127
128 if (pdata == NULL) {
129 dev_err(dev->dev, "no platform data\n");
130 return -EINVAL;
131 }
132
133 sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
134 if (sdev == NULL) {
135 dev_err(dev->dev, "failed to allocate private data\n");
136 return -ENOMEM;
137 }
138
139 sdev->dev = &pdev->dev;
140 sdev->pdata = pdata;
141 spin_lock_init(&sdev->irq_lock);
142
143 sdev->ddev = dev;
144 dev->dev_private = sdev;
145
146 /* I/O resources and clocks */
147 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
148 if (res == NULL) {
149 dev_err(&pdev->dev, "failed to get memory resource\n");
150 return -EINVAL;
151 }
152
153 sdev->mmio = devm_ioremap_nocache(&pdev->dev, res->start,
154 resource_size(res));
155 if (sdev->mmio == NULL) {
156 dev_err(&pdev->dev, "failed to remap memory resource\n");
157 return -ENOMEM;
158 }
159
160 ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
161 if (ret < 0)
162 return ret;
163
164 ret = shmob_drm_init_interface(sdev);
165 if (ret < 0)
166 return ret;
167
168 ret = shmob_drm_modeset_init(sdev);
169 if (ret < 0) {
170 dev_err(&pdev->dev, "failed to initialize mode setting\n");
171 return ret;
172 }
173
174 for (i = 0; i < 4; ++i) {
175 ret = shmob_drm_plane_create(sdev, i);
176 if (ret < 0) {
177 dev_err(&pdev->dev, "failed to create plane %u\n", i);
178 goto done;
179 }
180 }
181
182 ret = drm_vblank_init(dev, 1);
183 if (ret < 0) {
184 dev_err(&pdev->dev, "failed to initialize vblank\n");
185 goto done;
186 }
187
188 ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
189 if (ret < 0) {
190 dev_err(&pdev->dev, "failed to install IRQ handler\n");
191 goto done;
192 }
193
194 platform_set_drvdata(pdev, sdev);
195
196 done:
197 if (ret)
198 shmob_drm_unload(dev);
199
200 return ret;
201 }
202
shmob_drm_preclose(struct drm_device * dev,struct drm_file * file)203 static void shmob_drm_preclose(struct drm_device *dev, struct drm_file *file)
204 {
205 struct shmob_drm_device *sdev = dev->dev_private;
206
207 shmob_drm_crtc_cancel_page_flip(&sdev->crtc, file);
208 }
209
shmob_drm_irq(int irq,void * arg)210 static irqreturn_t shmob_drm_irq(int irq, void *arg)
211 {
212 struct drm_device *dev = arg;
213 struct shmob_drm_device *sdev = dev->dev_private;
214 unsigned long flags;
215 u32 status;
216
217 /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
218 * bits in the same register is really brain-dead design and requires
219 * taking a spinlock.
220 */
221 spin_lock_irqsave(&sdev->irq_lock, flags);
222 status = lcdc_read(sdev, LDINTR);
223 lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
224 spin_unlock_irqrestore(&sdev->irq_lock, flags);
225
226 if (status & LDINTR_VES) {
227 drm_handle_vblank(dev, 0);
228 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
229 }
230
231 return IRQ_HANDLED;
232 }
233
shmob_drm_enable_vblank(struct drm_device * dev,unsigned int pipe)234 static int shmob_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
235 {
236 struct shmob_drm_device *sdev = dev->dev_private;
237
238 shmob_drm_crtc_enable_vblank(sdev, true);
239
240 return 0;
241 }
242
shmob_drm_disable_vblank(struct drm_device * dev,unsigned int pipe)243 static void shmob_drm_disable_vblank(struct drm_device *dev, unsigned int pipe)
244 {
245 struct shmob_drm_device *sdev = dev->dev_private;
246
247 shmob_drm_crtc_enable_vblank(sdev, false);
248 }
249
250 static const struct file_operations shmob_drm_fops = {
251 .owner = THIS_MODULE,
252 .open = drm_open,
253 .release = drm_release,
254 .unlocked_ioctl = drm_ioctl,
255 #ifdef CONFIG_COMPAT
256 .compat_ioctl = drm_compat_ioctl,
257 #endif
258 .poll = drm_poll,
259 .read = drm_read,
260 .llseek = no_llseek,
261 .mmap = drm_gem_cma_mmap,
262 };
263
264 static struct drm_driver shmob_drm_driver = {
265 .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
266 | DRIVER_PRIME,
267 .load = shmob_drm_load,
268 .unload = shmob_drm_unload,
269 .preclose = shmob_drm_preclose,
270 .set_busid = drm_platform_set_busid,
271 .irq_handler = shmob_drm_irq,
272 .get_vblank_counter = drm_vblank_no_hw_counter,
273 .enable_vblank = shmob_drm_enable_vblank,
274 .disable_vblank = shmob_drm_disable_vblank,
275 .gem_free_object = drm_gem_cma_free_object,
276 .gem_vm_ops = &drm_gem_cma_vm_ops,
277 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
278 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
279 .gem_prime_import = drm_gem_prime_import,
280 .gem_prime_export = drm_gem_prime_export,
281 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
282 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
283 .gem_prime_vmap = drm_gem_cma_prime_vmap,
284 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
285 .gem_prime_mmap = drm_gem_cma_prime_mmap,
286 .dumb_create = drm_gem_cma_dumb_create,
287 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
288 .dumb_destroy = drm_gem_dumb_destroy,
289 .fops = &shmob_drm_fops,
290 .name = "shmob-drm",
291 .desc = "Renesas SH Mobile DRM",
292 .date = "20120424",
293 .major = 1,
294 .minor = 0,
295 };
296
297 /* -----------------------------------------------------------------------------
298 * Power management
299 */
300
301 #ifdef CONFIG_PM_SLEEP
shmob_drm_pm_suspend(struct device * dev)302 static int shmob_drm_pm_suspend(struct device *dev)
303 {
304 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
305
306 drm_kms_helper_poll_disable(sdev->ddev);
307 shmob_drm_crtc_suspend(&sdev->crtc);
308
309 return 0;
310 }
311
shmob_drm_pm_resume(struct device * dev)312 static int shmob_drm_pm_resume(struct device *dev)
313 {
314 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
315
316 drm_modeset_lock_all(sdev->ddev);
317 shmob_drm_crtc_resume(&sdev->crtc);
318 drm_modeset_unlock_all(sdev->ddev);
319
320 drm_kms_helper_poll_enable(sdev->ddev);
321 return 0;
322 }
323 #endif
324
325 static const struct dev_pm_ops shmob_drm_pm_ops = {
326 SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
327 };
328
329 /* -----------------------------------------------------------------------------
330 * Platform driver
331 */
332
shmob_drm_probe(struct platform_device * pdev)333 static int shmob_drm_probe(struct platform_device *pdev)
334 {
335 return drm_platform_init(&shmob_drm_driver, pdev);
336 }
337
shmob_drm_remove(struct platform_device * pdev)338 static int shmob_drm_remove(struct platform_device *pdev)
339 {
340 struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
341
342 drm_put_dev(sdev->ddev);
343
344 return 0;
345 }
346
347 static struct platform_driver shmob_drm_platform_driver = {
348 .probe = shmob_drm_probe,
349 .remove = shmob_drm_remove,
350 .driver = {
351 .name = "shmob-drm",
352 .pm = &shmob_drm_pm_ops,
353 },
354 };
355
356 module_platform_driver(shmob_drm_platform_driver);
357
358 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
359 MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
360 MODULE_LICENSE("GPL");
361