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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_modeset_helper.h>
27#include <drm/drm_probe_helper.h>
28#include <drm/drm_vblank.h>
29
30#include "fsl_dcu_drm_crtc.h"
31#include "fsl_dcu_drm_drv.h"
32#include "fsl_tcon.h"
33
34static int legacyfb_depth = 24;
35module_param(legacyfb_depth, int, 0444);
36
37static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
38{
39 if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
40 return true;
41
42 return false;
43}
44
45static const struct regmap_config fsl_dcu_regmap_config = {
46 .reg_bits = 32,
47 .reg_stride = 4,
48 .val_bits = 32,
49
50 .volatile_reg = fsl_dcu_drm_is_volatile_reg,
51};
52
53static void fsl_dcu_irq_reset(struct drm_device *dev)
54{
55 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
56
57 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
58 regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
59}
60
61static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
62{
63 struct drm_device *dev = arg;
64 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
65 unsigned int int_status;
66 int ret;
67
68 ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
69 if (ret) {
70 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
71 return IRQ_NONE;
72 }
73
74 if (int_status & DCU_INT_STATUS_VBLANK)
75 drm_handle_vblank(dev, 0);
76
77 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
78
79 return IRQ_HANDLED;
80}
81
82static int fsl_dcu_irq_install(struct drm_device *dev, unsigned int irq)
83{
84 if (irq == IRQ_NOTCONNECTED)
85 return -ENOTCONN;
86
87 fsl_dcu_irq_reset(dev);
88
89 return request_irq(irq, fsl_dcu_drm_irq, 0, dev->driver->name, dev);
90}
91
92static void fsl_dcu_irq_uninstall(struct drm_device *dev)
93{
94 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
95
96 fsl_dcu_irq_reset(dev);
97 free_irq(fsl_dev->irq, dev);
98}
99
100static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
101{
102 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
103 int ret;
104
105 ret = fsl_dcu_drm_modeset_init(fsl_dev);
106 if (ret < 0) {
107 dev_err(dev->dev, "failed to initialize mode setting\n");
108 return ret;
109 }
110
111 ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
112 if (ret < 0) {
113 dev_err(dev->dev, "failed to initialize vblank\n");
114 goto done_vblank;
115 }
116
117 ret = fsl_dcu_irq_install(dev, fsl_dev->irq);
118 if (ret < 0) {
119 dev_err(dev->dev, "failed to install IRQ handler\n");
120 goto done_irq;
121 }
122
123 if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
124 legacyfb_depth != 32) {
125 dev_warn(dev->dev,
126 "Invalid legacyfb_depth. Defaulting to 24bpp\n");
127 legacyfb_depth = 24;
128 }
129
130 return 0;
131done_irq:
132 drm_kms_helper_poll_fini(dev);
133
134 drm_mode_config_cleanup(dev);
135done_vblank:
136 dev->dev_private = NULL;
137
138 return ret;
139}
140
141static void fsl_dcu_unload(struct drm_device *dev)
142{
143 drm_atomic_helper_shutdown(dev);
144 drm_kms_helper_poll_fini(dev);
145
146 drm_mode_config_cleanup(dev);
147 fsl_dcu_irq_uninstall(dev);
148
149 dev->dev_private = NULL;
150}
151
152DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops);
153
154static const struct drm_driver fsl_dcu_drm_driver = {
155 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
156 .load = fsl_dcu_load,
157 .unload = fsl_dcu_unload,
158 DRM_GEM_CMA_DRIVER_OPS,
159 .fops = &fsl_dcu_drm_fops,
160 .name = "fsl-dcu-drm",
161 .desc = "Freescale DCU DRM",
162 .date = "20160425",
163 .major = 1,
164 .minor = 1,
165};
166
167#ifdef CONFIG_PM_SLEEP
168static int fsl_dcu_drm_pm_suspend(struct device *dev)
169{
170 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
171 int ret;
172
173 if (!fsl_dev)
174 return 0;
175
176 disable_irq(fsl_dev->irq);
177
178 ret = drm_mode_config_helper_suspend(fsl_dev->drm);
179 if (ret) {
180 enable_irq(fsl_dev->irq);
181 return ret;
182 }
183
184 clk_disable_unprepare(fsl_dev->clk);
185
186 return 0;
187}
188
189static int fsl_dcu_drm_pm_resume(struct device *dev)
190{
191 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
192 int ret;
193
194 if (!fsl_dev)
195 return 0;
196
197 ret = clk_prepare_enable(fsl_dev->clk);
198 if (ret < 0) {
199 dev_err(dev, "failed to enable dcu clk\n");
200 return ret;
201 }
202
203 if (fsl_dev->tcon)
204 fsl_tcon_bypass_enable(fsl_dev->tcon);
205 fsl_dcu_drm_init_planes(fsl_dev->drm);
206 enable_irq(fsl_dev->irq);
207
208 drm_mode_config_helper_resume(fsl_dev->drm);
209
210 return 0;
211}
212#endif
213
214static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
215 SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
216};
217
218static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
219 .name = "ls1021a",
220 .total_layer = 16,
221 .max_layer = 4,
222 .layer_regs = LS1021A_LAYER_REG_NUM,
223};
224
225static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
226 .name = "vf610",
227 .total_layer = 64,
228 .max_layer = 6,
229 .layer_regs = VF610_LAYER_REG_NUM,
230};
231
232static const struct of_device_id fsl_dcu_of_match[] = {
233 {
234 .compatible = "fsl,ls1021a-dcu",
235 .data = &fsl_dcu_ls1021a_data,
236 }, {
237 .compatible = "fsl,vf610-dcu",
238 .data = &fsl_dcu_vf610_data,
239 }, {
240 },
241};
242MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
243
244static int fsl_dcu_drm_probe(struct platform_device *pdev)
245{
246 struct fsl_dcu_drm_device *fsl_dev;
247 struct drm_device *drm;
248 struct device *dev = &pdev->dev;
249 struct resource *res;
250 void __iomem *base;
251 struct clk *pix_clk_in;
252 char pix_clk_name[32];
253 const char *pix_clk_in_name;
254 const struct of_device_id *id;
255 int ret;
256 u8 div_ratio_shift = 0;
257
258 fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
259 if (!fsl_dev)
260 return -ENOMEM;
261
262 id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
263 if (!id)
264 return -ENODEV;
265 fsl_dev->soc = id->data;
266
267 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
268 base = devm_ioremap_resource(dev, res);
269 if (IS_ERR(base)) {
270 ret = PTR_ERR(base);
271 return ret;
272 }
273
274 fsl_dev->irq = platform_get_irq(pdev, 0);
275 if (fsl_dev->irq < 0) {
276 dev_err(dev, "failed to get irq\n");
277 return fsl_dev->irq;
278 }
279
280 fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
281 &fsl_dcu_regmap_config);
282 if (IS_ERR(fsl_dev->regmap)) {
283 dev_err(dev, "regmap init failed\n");
284 return PTR_ERR(fsl_dev->regmap);
285 }
286
287 fsl_dev->clk = devm_clk_get(dev, "dcu");
288 if (IS_ERR(fsl_dev->clk)) {
289 dev_err(dev, "failed to get dcu clock\n");
290 return PTR_ERR(fsl_dev->clk);
291 }
292 ret = clk_prepare_enable(fsl_dev->clk);
293 if (ret < 0) {
294 dev_err(dev, "failed to enable dcu clk\n");
295 return ret;
296 }
297
298 pix_clk_in = devm_clk_get(dev, "pix");
299 if (IS_ERR(pix_clk_in)) {
300
301 pix_clk_in = fsl_dev->clk;
302 }
303
304 if (of_property_read_bool(dev->of_node, "big-endian"))
305 div_ratio_shift = 24;
306
307 pix_clk_in_name = __clk_get_name(pix_clk_in);
308 snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
309 fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
310 pix_clk_in_name, 0, base + DCU_DIV_RATIO,
311 div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
312 if (IS_ERR(fsl_dev->pix_clk)) {
313 dev_err(dev, "failed to register pix clk\n");
314 ret = PTR_ERR(fsl_dev->pix_clk);
315 goto disable_clk;
316 }
317
318 fsl_dev->tcon = fsl_tcon_init(dev);
319
320 drm = drm_dev_alloc(&fsl_dcu_drm_driver, dev);
321 if (IS_ERR(drm)) {
322 ret = PTR_ERR(drm);
323 goto unregister_pix_clk;
324 }
325
326 fsl_dev->dev = dev;
327 fsl_dev->drm = drm;
328 fsl_dev->np = dev->of_node;
329 drm->dev_private = fsl_dev;
330 dev_set_drvdata(dev, fsl_dev);
331
332 ret = drm_dev_register(drm, 0);
333 if (ret < 0)
334 goto put;
335
336 drm_fbdev_generic_setup(drm, legacyfb_depth);
337
338 return 0;
339
340put:
341 drm_dev_put(drm);
342unregister_pix_clk:
343 clk_unregister(fsl_dev->pix_clk);
344disable_clk:
345 clk_disable_unprepare(fsl_dev->clk);
346 return ret;
347}
348
349static int fsl_dcu_drm_remove(struct platform_device *pdev)
350{
351 struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
352
353 drm_dev_unregister(fsl_dev->drm);
354 drm_dev_put(fsl_dev->drm);
355 clk_disable_unprepare(fsl_dev->clk);
356 clk_unregister(fsl_dev->pix_clk);
357
358 return 0;
359}
360
361static struct platform_driver fsl_dcu_drm_platform_driver = {
362 .probe = fsl_dcu_drm_probe,
363 .remove = fsl_dcu_drm_remove,
364 .driver = {
365 .name = "fsl-dcu",
366 .pm = &fsl_dcu_drm_pm_ops,
367 .of_match_table = fsl_dcu_of_match,
368 },
369};
370
371module_platform_driver(fsl_dcu_drm_platform_driver);
372
373MODULE_DESCRIPTION("Freescale DCU DRM Driver");
374MODULE_LICENSE("GPL");
375
