1
2
3
4
5
6
7
8#include <linux/clk.h>
9#include <linux/clk-provider.h>
10#include <linux/console.h>
11#include <linux/io.h>
12#include <linux/mfd/syscon.h>
13#include <linux/mm.h>
14#include <linux/module.h>
15#include <linux/of_platform.h>
16#include <linux/platform_device.h>
17#include <linux/pm.h>
18#include <linux/pm_runtime.h>
19#include <linux/regmap.h>
20
21#include <drm/drm_atomic_helper.h>
22#include <drm/drm_drv.h>
23#include <drm/drm_fb_cma_helper.h>
24#include <drm/drm_fb_helper.h>
25#include <drm/drm_gem_cma_helper.h>
26#include <drm/drm_irq.h>
27#include <drm/drm_modeset_helper.h>
28#include <drm/drm_probe_helper.h>
29#include <drm/drm_vblank.h>
30
31#include "fsl_dcu_drm_crtc.h"
32#include "fsl_dcu_drm_drv.h"
33#include "fsl_tcon.h"
34
35static int legacyfb_depth = 24;
36module_param(legacyfb_depth, int, 0444);
37
38static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
39{
40 if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
41 return true;
42
43 return false;
44}
45
46static const struct regmap_config fsl_dcu_regmap_config = {
47 .reg_bits = 32,
48 .reg_stride = 4,
49 .val_bits = 32,
50
51 .volatile_reg = fsl_dcu_drm_is_volatile_reg,
52};
53
54static void fsl_dcu_irq_uninstall(struct drm_device *dev)
55{
56 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
57
58 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
59 regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
60}
61
62static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
63{
64 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
65 int ret;
66
67 ret = fsl_dcu_drm_modeset_init(fsl_dev);
68 if (ret < 0) {
69 dev_err(dev->dev, "failed to initialize mode setting\n");
70 return ret;
71 }
72
73 ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
74 if (ret < 0) {
75 dev_err(dev->dev, "failed to initialize vblank\n");
76 goto done;
77 }
78
79 ret = drm_irq_install(dev, fsl_dev->irq);
80 if (ret < 0) {
81 dev_err(dev->dev, "failed to install IRQ handler\n");
82 goto done;
83 }
84
85 if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
86 legacyfb_depth != 32) {
87 dev_warn(dev->dev,
88 "Invalid legacyfb_depth. Defaulting to 24bpp\n");
89 legacyfb_depth = 24;
90 }
91
92 return 0;
93done:
94 drm_kms_helper_poll_fini(dev);
95
96 drm_mode_config_cleanup(dev);
97 drm_irq_uninstall(dev);
98 dev->dev_private = NULL;
99
100 return ret;
101}
102
103static void fsl_dcu_unload(struct drm_device *dev)
104{
105 drm_atomic_helper_shutdown(dev);
106 drm_kms_helper_poll_fini(dev);
107
108 drm_mode_config_cleanup(dev);
109 drm_irq_uninstall(dev);
110
111 dev->dev_private = NULL;
112}
113
114static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
115{
116 struct drm_device *dev = arg;
117 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
118 unsigned int int_status;
119 int ret;
120
121 ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
122 if (ret) {
123 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
124 return IRQ_NONE;
125 }
126
127 if (int_status & DCU_INT_STATUS_VBLANK)
128 drm_handle_vblank(dev, 0);
129
130 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
131
132 return IRQ_HANDLED;
133}
134
135DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops);
136
137static struct drm_driver fsl_dcu_drm_driver = {
138 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
139 .load = fsl_dcu_load,
140 .unload = fsl_dcu_unload,
141 .irq_handler = fsl_dcu_drm_irq,
142 .irq_preinstall = fsl_dcu_irq_uninstall,
143 .irq_uninstall = fsl_dcu_irq_uninstall,
144 DRM_GEM_CMA_DRIVER_OPS,
145 .fops = &fsl_dcu_drm_fops,
146 .name = "fsl-dcu-drm",
147 .desc = "Freescale DCU DRM",
148 .date = "20160425",
149 .major = 1,
150 .minor = 1,
151};
152
153#ifdef CONFIG_PM_SLEEP
154static int fsl_dcu_drm_pm_suspend(struct device *dev)
155{
156 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
157 int ret;
158
159 if (!fsl_dev)
160 return 0;
161
162 disable_irq(fsl_dev->irq);
163
164 ret = drm_mode_config_helper_suspend(fsl_dev->drm);
165 if (ret) {
166 enable_irq(fsl_dev->irq);
167 return ret;
168 }
169
170 clk_disable_unprepare(fsl_dev->clk);
171
172 return 0;
173}
174
175static int fsl_dcu_drm_pm_resume(struct device *dev)
176{
177 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
178 int ret;
179
180 if (!fsl_dev)
181 return 0;
182
183 ret = clk_prepare_enable(fsl_dev->clk);
184 if (ret < 0) {
185 dev_err(dev, "failed to enable dcu clk\n");
186 return ret;
187 }
188
189 if (fsl_dev->tcon)
190 fsl_tcon_bypass_enable(fsl_dev->tcon);
191 fsl_dcu_drm_init_planes(fsl_dev->drm);
192 enable_irq(fsl_dev->irq);
193
194 drm_mode_config_helper_resume(fsl_dev->drm);
195
196 return 0;
197}
198#endif
199
200static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
201 SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
202};
203
204static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
205 .name = "ls1021a",
206 .total_layer = 16,
207 .max_layer = 4,
208 .layer_regs = LS1021A_LAYER_REG_NUM,
209};
210
211static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
212 .name = "vf610",
213 .total_layer = 64,
214 .max_layer = 6,
215 .layer_regs = VF610_LAYER_REG_NUM,
216};
217
218static const struct of_device_id fsl_dcu_of_match[] = {
219 {
220 .compatible = "fsl,ls1021a-dcu",
221 .data = &fsl_dcu_ls1021a_data,
222 }, {
223 .compatible = "fsl,vf610-dcu",
224 .data = &fsl_dcu_vf610_data,
225 }, {
226 },
227};
228MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
229
230static int fsl_dcu_drm_probe(struct platform_device *pdev)
231{
232 struct fsl_dcu_drm_device *fsl_dev;
233 struct drm_device *drm;
234 struct device *dev = &pdev->dev;
235 struct resource *res;
236 void __iomem *base;
237 struct drm_driver *driver = &fsl_dcu_drm_driver;
238 struct clk *pix_clk_in;
239 char pix_clk_name[32];
240 const char *pix_clk_in_name;
241 const struct of_device_id *id;
242 int ret;
243 u8 div_ratio_shift = 0;
244
245 fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
246 if (!fsl_dev)
247 return -ENOMEM;
248
249 id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
250 if (!id)
251 return -ENODEV;
252 fsl_dev->soc = id->data;
253
254 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
255 base = devm_ioremap_resource(dev, res);
256 if (IS_ERR(base)) {
257 ret = PTR_ERR(base);
258 return ret;
259 }
260
261 fsl_dev->irq = platform_get_irq(pdev, 0);
262 if (fsl_dev->irq < 0) {
263 dev_err(dev, "failed to get irq\n");
264 return fsl_dev->irq;
265 }
266
267 fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
268 &fsl_dcu_regmap_config);
269 if (IS_ERR(fsl_dev->regmap)) {
270 dev_err(dev, "regmap init failed\n");
271 return PTR_ERR(fsl_dev->regmap);
272 }
273
274 fsl_dev->clk = devm_clk_get(dev, "dcu");
275 if (IS_ERR(fsl_dev->clk)) {
276 dev_err(dev, "failed to get dcu clock\n");
277 return PTR_ERR(fsl_dev->clk);
278 }
279 ret = clk_prepare_enable(fsl_dev->clk);
280 if (ret < 0) {
281 dev_err(dev, "failed to enable dcu clk\n");
282 return ret;
283 }
284
285 pix_clk_in = devm_clk_get(dev, "pix");
286 if (IS_ERR(pix_clk_in)) {
287
288 pix_clk_in = fsl_dev->clk;
289 }
290
291 if (of_property_read_bool(dev->of_node, "big-endian"))
292 div_ratio_shift = 24;
293
294 pix_clk_in_name = __clk_get_name(pix_clk_in);
295 snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
296 fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
297 pix_clk_in_name, 0, base + DCU_DIV_RATIO,
298 div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
299 if (IS_ERR(fsl_dev->pix_clk)) {
300 dev_err(dev, "failed to register pix clk\n");
301 ret = PTR_ERR(fsl_dev->pix_clk);
302 goto disable_clk;
303 }
304
305 fsl_dev->tcon = fsl_tcon_init(dev);
306
307 drm = drm_dev_alloc(driver, dev);
308 if (IS_ERR(drm)) {
309 ret = PTR_ERR(drm);
310 goto unregister_pix_clk;
311 }
312
313 fsl_dev->dev = dev;
314 fsl_dev->drm = drm;
315 fsl_dev->np = dev->of_node;
316 drm->dev_private = fsl_dev;
317 dev_set_drvdata(dev, fsl_dev);
318
319 ret = drm_dev_register(drm, 0);
320 if (ret < 0)
321 goto put;
322
323 drm_fbdev_generic_setup(drm, legacyfb_depth);
324
325 return 0;
326
327put:
328 drm_dev_put(drm);
329unregister_pix_clk:
330 clk_unregister(fsl_dev->pix_clk);
331disable_clk:
332 clk_disable_unprepare(fsl_dev->clk);
333 return ret;
334}
335
336static int fsl_dcu_drm_remove(struct platform_device *pdev)
337{
338 struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
339
340 drm_dev_unregister(fsl_dev->drm);
341 drm_dev_put(fsl_dev->drm);
342 clk_disable_unprepare(fsl_dev->clk);
343 clk_unregister(fsl_dev->pix_clk);
344
345 return 0;
346}
347
348static struct platform_driver fsl_dcu_drm_platform_driver = {
349 .probe = fsl_dcu_drm_probe,
350 .remove = fsl_dcu_drm_remove,
351 .driver = {
352 .name = "fsl-dcu",
353 .pm = &fsl_dcu_drm_pm_ops,
354 .of_match_table = fsl_dcu_of_match,
355 },
356};
357
358module_platform_driver(fsl_dcu_drm_platform_driver);
359
360MODULE_DESCRIPTION("Freescale DCU DRM Driver");
361MODULE_LICENSE("GPL");
362
