1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2016 Marek Vasut <marex@denx.de>
4 *
5 * This code is based on drivers/video/fbdev/mxsfb.c :
6 * Copyright (C) 2010 Juergen Beisert, Pengutronix
7 * Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
8 * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
9 */
10
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_irq.h>
28 #include <drm/drm_mode_config.h>
29 #include <drm/drm_of.h>
30 #include <drm/drm_probe_helper.h>
31 #include <drm/drm_vblank.h>
32
33 #include "mxsfb_drv.h"
34 #include "mxsfb_regs.h"
35
36 enum mxsfb_devtype {
37 MXSFB_V3,
38 MXSFB_V4,
39 /*
40 * Starting at i.MX6 the hardware version register is gone, use the
41 * i.MX family number as the version.
42 */
43 MXSFB_V6,
44 };
45
46 static const struct mxsfb_devdata mxsfb_devdata[] = {
47 [MXSFB_V3] = {
48 .transfer_count = LCDC_V3_TRANSFER_COUNT,
49 .cur_buf = LCDC_V3_CUR_BUF,
50 .next_buf = LCDC_V3_NEXT_BUF,
51 .hs_wdth_mask = 0xff,
52 .hs_wdth_shift = 24,
53 .has_overlay = false,
54 .has_ctrl2 = false,
55 },
56 [MXSFB_V4] = {
57 .transfer_count = LCDC_V4_TRANSFER_COUNT,
58 .cur_buf = LCDC_V4_CUR_BUF,
59 .next_buf = LCDC_V4_NEXT_BUF,
60 .hs_wdth_mask = 0x3fff,
61 .hs_wdth_shift = 18,
62 .has_overlay = false,
63 .has_ctrl2 = true,
64 },
65 [MXSFB_V6] = {
66 .transfer_count = LCDC_V4_TRANSFER_COUNT,
67 .cur_buf = LCDC_V4_CUR_BUF,
68 .next_buf = LCDC_V4_NEXT_BUF,
69 .hs_wdth_mask = 0x3fff,
70 .hs_wdth_shift = 18,
71 .has_overlay = true,
72 .has_ctrl2 = true,
73 },
74 };
75
mxsfb_enable_axi_clk(struct mxsfb_drm_private * mxsfb)76 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
77 {
78 if (mxsfb->clk_axi)
79 clk_prepare_enable(mxsfb->clk_axi);
80 }
81
mxsfb_disable_axi_clk(struct mxsfb_drm_private * mxsfb)82 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
83 {
84 if (mxsfb->clk_axi)
85 clk_disable_unprepare(mxsfb->clk_axi);
86 }
87
88 static struct drm_framebuffer *
mxsfb_fb_create(struct drm_device * dev,struct drm_file * file_priv,const struct drm_mode_fb_cmd2 * mode_cmd)89 mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv,
90 const struct drm_mode_fb_cmd2 *mode_cmd)
91 {
92 const struct drm_format_info *info;
93
94 info = drm_get_format_info(dev, mode_cmd);
95 if (!info)
96 return ERR_PTR(-EINVAL);
97
98 if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) {
99 dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n");
100 return ERR_PTR(-EINVAL);
101 }
102
103 return drm_gem_fb_create(dev, file_priv, mode_cmd);
104 }
105
106 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
107 .fb_create = mxsfb_fb_create,
108 .atomic_check = drm_atomic_helper_check,
109 .atomic_commit = drm_atomic_helper_commit,
110 };
111
112 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {
113 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
114 };
115
mxsfb_attach_bridge(struct mxsfb_drm_private * mxsfb)116 static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
117 {
118 struct drm_device *drm = mxsfb->drm;
119 struct drm_connector_list_iter iter;
120 struct drm_panel *panel;
121 struct drm_bridge *bridge;
122 int ret;
123
124 ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel,
125 &bridge);
126 if (ret)
127 return ret;
128
129 if (panel) {
130 bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel,
131 DRM_MODE_CONNECTOR_DPI);
132 if (IS_ERR(bridge))
133 return PTR_ERR(bridge);
134 }
135
136 if (!bridge)
137 return -ENODEV;
138
139 ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0);
140 if (ret)
141 return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
142
143 mxsfb->bridge = bridge;
144
145 /*
146 * Get hold of the connector. This is a bit of a hack, until the bridge
147 * API gives us bus flags and formats.
148 */
149 drm_connector_list_iter_begin(drm, &iter);
150 mxsfb->connector = drm_connector_list_iter_next(&iter);
151 drm_connector_list_iter_end(&iter);
152
153 return 0;
154 }
155
mxsfb_load(struct drm_device * drm,const struct mxsfb_devdata * devdata)156 static int mxsfb_load(struct drm_device *drm,
157 const struct mxsfb_devdata *devdata)
158 {
159 struct platform_device *pdev = to_platform_device(drm->dev);
160 struct mxsfb_drm_private *mxsfb;
161 struct resource *res;
162 int ret;
163
164 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
165 if (!mxsfb)
166 return -ENOMEM;
167
168 mxsfb->drm = drm;
169 drm->dev_private = mxsfb;
170 mxsfb->devdata = devdata;
171
172 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
173 mxsfb->base = devm_ioremap_resource(drm->dev, res);
174 if (IS_ERR(mxsfb->base))
175 return PTR_ERR(mxsfb->base);
176
177 mxsfb->clk = devm_clk_get(drm->dev, NULL);
178 if (IS_ERR(mxsfb->clk))
179 return PTR_ERR(mxsfb->clk);
180
181 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
182 if (IS_ERR(mxsfb->clk_axi))
183 mxsfb->clk_axi = NULL;
184
185 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
186 if (IS_ERR(mxsfb->clk_disp_axi))
187 mxsfb->clk_disp_axi = NULL;
188
189 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
190 if (ret)
191 return ret;
192
193 pm_runtime_enable(drm->dev);
194
195 /* Modeset init */
196 drm_mode_config_init(drm);
197
198 ret = mxsfb_kms_init(mxsfb);
199 if (ret < 0) {
200 dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
201 goto err_vblank;
202 }
203
204 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
205 if (ret < 0) {
206 dev_err(drm->dev, "Failed to initialise vblank\n");
207 goto err_vblank;
208 }
209
210 /* Start with vertical blanking interrupt reporting disabled. */
211 drm_crtc_vblank_off(&mxsfb->crtc);
212
213 ret = mxsfb_attach_bridge(mxsfb);
214 if (ret) {
215 if (ret != -EPROBE_DEFER)
216 dev_err(drm->dev, "Cannot connect bridge: %d\n", ret);
217 goto err_vblank;
218 }
219
220 drm->mode_config.min_width = MXSFB_MIN_XRES;
221 drm->mode_config.min_height = MXSFB_MIN_YRES;
222 drm->mode_config.max_width = MXSFB_MAX_XRES;
223 drm->mode_config.max_height = MXSFB_MAX_YRES;
224 drm->mode_config.funcs = &mxsfb_mode_config_funcs;
225 drm->mode_config.helper_private = &mxsfb_mode_config_helpers;
226
227 drm_mode_config_reset(drm);
228
229 pm_runtime_get_sync(drm->dev);
230 ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
231 pm_runtime_put_sync(drm->dev);
232
233 if (ret < 0) {
234 dev_err(drm->dev, "Failed to install IRQ handler\n");
235 goto err_vblank;
236 }
237
238 drm_kms_helper_poll_init(drm);
239
240 platform_set_drvdata(pdev, drm);
241
242 drm_helper_hpd_irq_event(drm);
243
244 return 0;
245
246 err_vblank:
247 pm_runtime_disable(drm->dev);
248
249 return ret;
250 }
251
mxsfb_unload(struct drm_device * drm)252 static void mxsfb_unload(struct drm_device *drm)
253 {
254 drm_kms_helper_poll_fini(drm);
255 drm_mode_config_cleanup(drm);
256
257 pm_runtime_get_sync(drm->dev);
258 drm_irq_uninstall(drm);
259 pm_runtime_put_sync(drm->dev);
260
261 drm->dev_private = NULL;
262
263 pm_runtime_disable(drm->dev);
264 }
265
mxsfb_irq_disable(struct drm_device * drm)266 static void mxsfb_irq_disable(struct drm_device *drm)
267 {
268 struct mxsfb_drm_private *mxsfb = drm->dev_private;
269
270 mxsfb_enable_axi_clk(mxsfb);
271
272 /* Disable and clear VBLANK IRQ */
273 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
274 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
275
276 mxsfb_disable_axi_clk(mxsfb);
277 }
278
mxsfb_irq_handler(int irq,void * data)279 static irqreturn_t mxsfb_irq_handler(int irq, void *data)
280 {
281 struct drm_device *drm = data;
282 struct mxsfb_drm_private *mxsfb = drm->dev_private;
283 u32 reg;
284
285 reg = readl(mxsfb->base + LCDC_CTRL1);
286
287 if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
288 drm_crtc_handle_vblank(&mxsfb->crtc);
289
290 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
291
292 return IRQ_HANDLED;
293 }
294
295 DEFINE_DRM_GEM_CMA_FOPS(fops);
296
297 static struct drm_driver mxsfb_driver = {
298 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
299 .irq_handler = mxsfb_irq_handler,
300 .irq_preinstall = mxsfb_irq_disable,
301 .irq_uninstall = mxsfb_irq_disable,
302 DRM_GEM_CMA_DRIVER_OPS,
303 .fops = &fops,
304 .name = "mxsfb-drm",
305 .desc = "MXSFB Controller DRM",
306 .date = "20160824",
307 .major = 1,
308 .minor = 0,
309 };
310
311 static const struct of_device_id mxsfb_dt_ids[] = {
312 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], },
313 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], },
314 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], },
315 { /* sentinel */ }
316 };
317 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
318
mxsfb_probe(struct platform_device * pdev)319 static int mxsfb_probe(struct platform_device *pdev)
320 {
321 struct drm_device *drm;
322 const struct of_device_id *of_id =
323 of_match_device(mxsfb_dt_ids, &pdev->dev);
324 int ret;
325
326 if (!pdev->dev.of_node)
327 return -ENODEV;
328
329 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
330 if (IS_ERR(drm))
331 return PTR_ERR(drm);
332
333 ret = mxsfb_load(drm, of_id->data);
334 if (ret)
335 goto err_free;
336
337 ret = drm_dev_register(drm, 0);
338 if (ret)
339 goto err_unload;
340
341 drm_fbdev_generic_setup(drm, 32);
342
343 return 0;
344
345 err_unload:
346 mxsfb_unload(drm);
347 err_free:
348 drm_dev_put(drm);
349
350 return ret;
351 }
352
mxsfb_remove(struct platform_device * pdev)353 static int mxsfb_remove(struct platform_device *pdev)
354 {
355 struct drm_device *drm = platform_get_drvdata(pdev);
356
357 drm_dev_unregister(drm);
358 mxsfb_unload(drm);
359 drm_dev_put(drm);
360
361 return 0;
362 }
363
364 #ifdef CONFIG_PM_SLEEP
mxsfb_suspend(struct device * dev)365 static int mxsfb_suspend(struct device *dev)
366 {
367 struct drm_device *drm = dev_get_drvdata(dev);
368
369 return drm_mode_config_helper_suspend(drm);
370 }
371
mxsfb_resume(struct device * dev)372 static int mxsfb_resume(struct device *dev)
373 {
374 struct drm_device *drm = dev_get_drvdata(dev);
375
376 return drm_mode_config_helper_resume(drm);
377 }
378 #endif
379
380 static const struct dev_pm_ops mxsfb_pm_ops = {
381 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume)
382 };
383
384 static struct platform_driver mxsfb_platform_driver = {
385 .probe = mxsfb_probe,
386 .remove = mxsfb_remove,
387 .driver = {
388 .name = "mxsfb",
389 .of_match_table = mxsfb_dt_ids,
390 .pm = &mxsfb_pm_ops,
391 },
392 };
393
394 module_platform_driver(mxsfb_platform_driver);
395
396 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
397 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
398 MODULE_LICENSE("GPL");
399