tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
36static 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
70static 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
107static 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
119static 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
196done:
197 if (ret)
198 shmob_drm_unload(dev);
199
200 return ret;
201}
202
203static irqreturn_t shmob_drm_irq(int irq, void *arg)
204{
205 struct drm_device *dev = arg;
206 struct shmob_drm_device *sdev = dev->dev_private;
207 unsigned long flags;
208 u32 status;
209
210 /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
211 * bits in the same register is really brain-dead design and requires
212 * taking a spinlock.
213 */
214 spin_lock_irqsave(&sdev->irq_lock, flags);
215 status = lcdc_read(sdev, LDINTR);
216 lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
217 spin_unlock_irqrestore(&sdev->irq_lock, flags);
218
219 if (status & LDINTR_VES) {
220 drm_handle_vblank(dev, 0);
221 shmob_drm_crtc_finish_page_flip(&sdev->crtc);
222 }
223
224 return IRQ_HANDLED;
225}
226
227static int shmob_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
228{
229 struct shmob_drm_device *sdev = dev->dev_private;
230
231 shmob_drm_crtc_enable_vblank(sdev, true);
232
233 return 0;
234}
235
236static void shmob_drm_disable_vblank(struct drm_device *dev, unsigned int pipe)
237{
238 struct shmob_drm_device *sdev = dev->dev_private;
239
240 shmob_drm_crtc_enable_vblank(sdev, false);
241}
242
243static const struct file_operations shmob_drm_fops = {
244 .owner = THIS_MODULE,
245 .open = drm_open,
246 .release = drm_release,
247 .unlocked_ioctl = drm_ioctl,
248#ifdef CONFIG_COMPAT
249 .compat_ioctl = drm_compat_ioctl,
250#endif
251 .poll = drm_poll,
252 .read = drm_read,
253 .llseek = no_llseek,
254 .mmap = drm_gem_cma_mmap,
255};
256
257static struct drm_driver shmob_drm_driver = {
258 .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
259 | DRIVER_PRIME,
260 .load = shmob_drm_load,
261 .unload = shmob_drm_unload,
262 .set_busid = drm_platform_set_busid,
263 .irq_handler = shmob_drm_irq,
264 .get_vblank_counter = drm_vblank_no_hw_counter,
265 .enable_vblank = shmob_drm_enable_vblank,
266 .disable_vblank = shmob_drm_disable_vblank,
267 .gem_free_object = drm_gem_cma_free_object,
268 .gem_vm_ops = &drm_gem_cma_vm_ops,
269 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
270 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
271 .gem_prime_import = drm_gem_prime_import,
272 .gem_prime_export = drm_gem_prime_export,
273 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
274 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
275 .gem_prime_vmap = drm_gem_cma_prime_vmap,
276 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
277 .gem_prime_mmap = drm_gem_cma_prime_mmap,
278 .dumb_create = drm_gem_cma_dumb_create,
279 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
280 .dumb_destroy = drm_gem_dumb_destroy,
281 .fops = &shmob_drm_fops,
282 .name = "shmob-drm",
283 .desc = "Renesas SH Mobile DRM",
284 .date = "20120424",
285 .major = 1,
286 .minor = 0,
287};
288
289/* -----------------------------------------------------------------------------
290 * Power management
291 */
292
293#ifdef CONFIG_PM_SLEEP
294static int shmob_drm_pm_suspend(struct device *dev)
295{
296 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
297
298 drm_kms_helper_poll_disable(sdev->ddev);
299 shmob_drm_crtc_suspend(&sdev->crtc);
300
301 return 0;
302}
303
304static int shmob_drm_pm_resume(struct device *dev)
305{
306 struct shmob_drm_device *sdev = dev_get_drvdata(dev);
307
308 drm_modeset_lock_all(sdev->ddev);
309 shmob_drm_crtc_resume(&sdev->crtc);
310 drm_modeset_unlock_all(sdev->ddev);
311
312 drm_kms_helper_poll_enable(sdev->ddev);
313 return 0;
314}
315#endif
316
317static const struct dev_pm_ops shmob_drm_pm_ops = {
318 SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
319};
320
321/* -----------------------------------------------------------------------------
322 * Platform driver
323 */
324
325static int shmob_drm_probe(struct platform_device *pdev)
326{
327 return drm_platform_init(&shmob_drm_driver, pdev);
328}
329
330static int shmob_drm_remove(struct platform_device *pdev)
331{
332 struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
333
334 drm_put_dev(sdev->ddev);
335
336 return 0;
337}
338
339static struct platform_driver shmob_drm_platform_driver = {
340 .probe = shmob_drm_probe,
341 .remove = shmob_drm_remove,
342 .driver = {
343 .name = "shmob-drm",
344 .pm = &shmob_drm_pm_ops,
345 },
346};
347
348module_platform_driver(shmob_drm_platform_driver);
349
350MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
351MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
352MODULE_LICENSE("GPL");