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11#include <linux/clk.h>
12#include <linux/dma-mapping.h>
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/of_device.h>
16#include <linux/platform_device.h>
17#include <linux/pm_runtime.h>
18
19#include <drm/drm_atomic_helper.h>
20#include <drm/drm_bridge.h>
21#include <drm/drm_connector.h>
22#include <drm/drm_drv.h>
23#include <drm/drm_fb_helper.h>
24#include <drm/drm_fourcc.h>
25#include <drm/drm_gem_cma_helper.h>
26#include <drm/drm_gem_framebuffer_helper.h>
27#include <drm/drm_mode_config.h>
28#include <drm/drm_of.h>
29#include <drm/drm_probe_helper.h>
30#include <drm/drm_vblank.h>
31
32#include "mxsfb_drv.h"
33#include "mxsfb_regs.h"
34
35enum mxsfb_devtype {
36 MXSFB_V3,
37 MXSFB_V4,
38
39
40
41
42 MXSFB_V6,
43};
44
45static const struct mxsfb_devdata mxsfb_devdata[] = {
46 [MXSFB_V3] = {
47 .transfer_count = LCDC_V3_TRANSFER_COUNT,
48 .cur_buf = LCDC_V3_CUR_BUF,
49 .next_buf = LCDC_V3_NEXT_BUF,
50 .hs_wdth_mask = 0xff,
51 .hs_wdth_shift = 24,
52 .has_overlay = false,
53 .has_ctrl2 = false,
54 },
55 [MXSFB_V4] = {
56 .transfer_count = LCDC_V4_TRANSFER_COUNT,
57 .cur_buf = LCDC_V4_CUR_BUF,
58 .next_buf = LCDC_V4_NEXT_BUF,
59 .hs_wdth_mask = 0x3fff,
60 .hs_wdth_shift = 18,
61 .has_overlay = false,
62 .has_ctrl2 = true,
63 },
64 [MXSFB_V6] = {
65 .transfer_count = LCDC_V4_TRANSFER_COUNT,
66 .cur_buf = LCDC_V4_CUR_BUF,
67 .next_buf = LCDC_V4_NEXT_BUF,
68 .hs_wdth_mask = 0x3fff,
69 .hs_wdth_shift = 18,
70 .has_overlay = true,
71 .has_ctrl2 = true,
72 },
73};
74
75void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
76{
77 if (mxsfb->clk_axi)
78 clk_prepare_enable(mxsfb->clk_axi);
79}
80
81void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
82{
83 if (mxsfb->clk_axi)
84 clk_disable_unprepare(mxsfb->clk_axi);
85}
86
87static struct drm_framebuffer *
88mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv,
89 const struct drm_mode_fb_cmd2 *mode_cmd)
90{
91 const struct drm_format_info *info;
92
93 info = drm_get_format_info(dev, mode_cmd);
94 if (!info)
95 return ERR_PTR(-EINVAL);
96
97 if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) {
98 dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n");
99 return ERR_PTR(-EINVAL);
100 }
101
102 return drm_gem_fb_create(dev, file_priv, mode_cmd);
103}
104
105static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
106 .fb_create = mxsfb_fb_create,
107 .atomic_check = drm_atomic_helper_check,
108 .atomic_commit = drm_atomic_helper_commit,
109};
110
111static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {
112 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
113};
114
115static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
116{
117 struct drm_device *drm = mxsfb->drm;
118 struct drm_connector_list_iter iter;
119 struct drm_panel *panel;
120 struct drm_bridge *bridge;
121 int ret;
122
123 ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel,
124 &bridge);
125 if (ret)
126 return ret;
127
128 if (panel) {
129 bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel,
130 DRM_MODE_CONNECTOR_DPI);
131 if (IS_ERR(bridge))
132 return PTR_ERR(bridge);
133 }
134
135 if (!bridge)
136 return -ENODEV;
137
138 ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0);
139 if (ret)
140 return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
141
142 mxsfb->bridge = bridge;
143
144
145
146
147
148 drm_connector_list_iter_begin(drm, &iter);
149 mxsfb->connector = drm_connector_list_iter_next(&iter);
150 drm_connector_list_iter_end(&iter);
151
152 return 0;
153}
154
155static irqreturn_t mxsfb_irq_handler(int irq, void *data)
156{
157 struct drm_device *drm = data;
158 struct mxsfb_drm_private *mxsfb = drm->dev_private;
159 u32 reg;
160
161 reg = readl(mxsfb->base + LCDC_CTRL1);
162
163 if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
164 drm_crtc_handle_vblank(&mxsfb->crtc);
165
166 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
167
168 return IRQ_HANDLED;
169}
170
171static void mxsfb_irq_disable(struct drm_device *drm)
172{
173 struct mxsfb_drm_private *mxsfb = drm->dev_private;
174
175 mxsfb_enable_axi_clk(mxsfb);
176
177
178 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
179 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
180
181 mxsfb_disable_axi_clk(mxsfb);
182}
183
184static int mxsfb_irq_install(struct drm_device *dev, int irq)
185{
186 if (irq == IRQ_NOTCONNECTED)
187 return -ENOTCONN;
188
189 mxsfb_irq_disable(dev);
190
191 return request_irq(irq, mxsfb_irq_handler, 0, dev->driver->name, dev);
192}
193
194static void mxsfb_irq_uninstall(struct drm_device *dev)
195{
196 struct mxsfb_drm_private *mxsfb = dev->dev_private;
197
198 mxsfb_irq_disable(dev);
199 free_irq(mxsfb->irq, dev);
200}
201
202static int mxsfb_load(struct drm_device *drm,
203 const struct mxsfb_devdata *devdata)
204{
205 struct platform_device *pdev = to_platform_device(drm->dev);
206 struct mxsfb_drm_private *mxsfb;
207 struct resource *res;
208 int ret;
209
210 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
211 if (!mxsfb)
212 return -ENOMEM;
213
214 mxsfb->drm = drm;
215 drm->dev_private = mxsfb;
216 mxsfb->devdata = devdata;
217
218 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
219 mxsfb->base = devm_ioremap_resource(drm->dev, res);
220 if (IS_ERR(mxsfb->base))
221 return PTR_ERR(mxsfb->base);
222
223 mxsfb->clk = devm_clk_get(drm->dev, NULL);
224 if (IS_ERR(mxsfb->clk))
225 return PTR_ERR(mxsfb->clk);
226
227 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
228 if (IS_ERR(mxsfb->clk_axi))
229 mxsfb->clk_axi = NULL;
230
231 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
232 if (IS_ERR(mxsfb->clk_disp_axi))
233 mxsfb->clk_disp_axi = NULL;
234
235 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
236 if (ret)
237 return ret;
238
239 pm_runtime_enable(drm->dev);
240
241
242 drm_mode_config_init(drm);
243
244 ret = mxsfb_kms_init(mxsfb);
245 if (ret < 0) {
246 dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
247 goto err_vblank;
248 }
249
250 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
251 if (ret < 0) {
252 dev_err(drm->dev, "Failed to initialise vblank\n");
253 goto err_vblank;
254 }
255
256
257 drm_crtc_vblank_off(&mxsfb->crtc);
258
259 ret = mxsfb_attach_bridge(mxsfb);
260 if (ret) {
261 if (ret != -EPROBE_DEFER)
262 dev_err(drm->dev, "Cannot connect bridge: %d\n", ret);
263 goto err_vblank;
264 }
265
266 drm->mode_config.min_width = MXSFB_MIN_XRES;
267 drm->mode_config.min_height = MXSFB_MIN_YRES;
268 drm->mode_config.max_width = MXSFB_MAX_XRES;
269 drm->mode_config.max_height = MXSFB_MAX_YRES;
270 drm->mode_config.funcs = &mxsfb_mode_config_funcs;
271 drm->mode_config.helper_private = &mxsfb_mode_config_helpers;
272
273 drm_mode_config_reset(drm);
274
275 ret = platform_get_irq(pdev, 0);
276 if (ret < 0)
277 goto err_vblank;
278 mxsfb->irq = ret;
279
280 pm_runtime_get_sync(drm->dev);
281 ret = mxsfb_irq_install(drm, mxsfb->irq);
282 pm_runtime_put_sync(drm->dev);
283
284 if (ret < 0) {
285 dev_err(drm->dev, "Failed to install IRQ handler\n");
286 goto err_vblank;
287 }
288
289 drm_kms_helper_poll_init(drm);
290
291 platform_set_drvdata(pdev, drm);
292
293 drm_helper_hpd_irq_event(drm);
294
295 return 0;
296
297err_vblank:
298 pm_runtime_disable(drm->dev);
299
300 return ret;
301}
302
303static void mxsfb_unload(struct drm_device *drm)
304{
305 drm_kms_helper_poll_fini(drm);
306 drm_mode_config_cleanup(drm);
307
308 pm_runtime_get_sync(drm->dev);
309 mxsfb_irq_uninstall(drm);
310 pm_runtime_put_sync(drm->dev);
311
312 drm->dev_private = NULL;
313
314 pm_runtime_disable(drm->dev);
315}
316
317DEFINE_DRM_GEM_CMA_FOPS(fops);
318
319static const struct drm_driver mxsfb_driver = {
320 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
321 DRM_GEM_CMA_DRIVER_OPS,
322 .fops = &fops,
323 .name = "mxsfb-drm",
324 .desc = "MXSFB Controller DRM",
325 .date = "20160824",
326 .major = 1,
327 .minor = 0,
328};
329
330static const struct of_device_id mxsfb_dt_ids[] = {
331 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], },
332 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], },
333 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], },
334 { }
335};
336MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
337
338static int mxsfb_probe(struct platform_device *pdev)
339{
340 struct drm_device *drm;
341 const struct of_device_id *of_id =
342 of_match_device(mxsfb_dt_ids, &pdev->dev);
343 int ret;
344
345 if (!pdev->dev.of_node)
346 return -ENODEV;
347
348 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
349 if (IS_ERR(drm))
350 return PTR_ERR(drm);
351
352 ret = mxsfb_load(drm, of_id->data);
353 if (ret)
354 goto err_free;
355
356 ret = drm_dev_register(drm, 0);
357 if (ret)
358 goto err_unload;
359
360 drm_fbdev_generic_setup(drm, 32);
361
362 return 0;
363
364err_unload:
365 mxsfb_unload(drm);
366err_free:
367 drm_dev_put(drm);
368
369 return ret;
370}
371
372static int mxsfb_remove(struct platform_device *pdev)
373{
374 struct drm_device *drm = platform_get_drvdata(pdev);
375
376 drm_dev_unregister(drm);
377 mxsfb_unload(drm);
378 drm_dev_put(drm);
379
380 return 0;
381}
382
383#ifdef CONFIG_PM_SLEEP
384static int mxsfb_suspend(struct device *dev)
385{
386 struct drm_device *drm = dev_get_drvdata(dev);
387
388 return drm_mode_config_helper_suspend(drm);
389}
390
391static int mxsfb_resume(struct device *dev)
392{
393 struct drm_device *drm = dev_get_drvdata(dev);
394
395 return drm_mode_config_helper_resume(drm);
396}
397#endif
398
399static const struct dev_pm_ops mxsfb_pm_ops = {
400 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume)
401};
402
403static struct platform_driver mxsfb_platform_driver = {
404 .probe = mxsfb_probe,
405 .remove = mxsfb_remove,
406 .driver = {
407 .name = "mxsfb",
408 .of_match_table = mxsfb_dt_ids,
409 .pm = &mxsfb_pm_ops,
410 },
411};
412
413module_platform_driver(mxsfb_platform_driver);
414
415MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
416MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
417MODULE_LICENSE("GPL");
418
