1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright 2019 NXP.
4 */
5
6 #include <linux/clk.h>
7 #include <linux/of_device.h>
8 #include <linux/of_graph.h>
9 #include <linux/pm_runtime.h>
10 #include <linux/slab.h>
11 #include <drm/drm_bridge_connector.h>
12 #include <drm/drm_device.h>
13 #include <drm/drm_modeset_helper.h>
14
15 #include "dcss-dev.h"
16 #include "dcss-kms.h"
17
dcss_clocks_enable(struct dcss_dev * dcss)18 static void dcss_clocks_enable(struct dcss_dev *dcss)
19 {
20 clk_prepare_enable(dcss->axi_clk);
21 clk_prepare_enable(dcss->apb_clk);
22 clk_prepare_enable(dcss->rtrm_clk);
23 clk_prepare_enable(dcss->dtrc_clk);
24 clk_prepare_enable(dcss->pix_clk);
25 }
26
dcss_clocks_disable(struct dcss_dev * dcss)27 static void dcss_clocks_disable(struct dcss_dev *dcss)
28 {
29 clk_disable_unprepare(dcss->pix_clk);
30 clk_disable_unprepare(dcss->dtrc_clk);
31 clk_disable_unprepare(dcss->rtrm_clk);
32 clk_disable_unprepare(dcss->apb_clk);
33 clk_disable_unprepare(dcss->axi_clk);
34 }
35
dcss_disable_dtg_and_ss_cb(void * data)36 static void dcss_disable_dtg_and_ss_cb(void *data)
37 {
38 struct dcss_dev *dcss = data;
39
40 dcss->disable_callback = NULL;
41
42 dcss_ss_shutoff(dcss->ss);
43 dcss_dtg_shutoff(dcss->dtg);
44
45 complete(&dcss->disable_completion);
46 }
47
dcss_disable_dtg_and_ss(struct dcss_dev * dcss)48 void dcss_disable_dtg_and_ss(struct dcss_dev *dcss)
49 {
50 dcss->disable_callback = dcss_disable_dtg_and_ss_cb;
51 }
52
dcss_enable_dtg_and_ss(struct dcss_dev * dcss)53 void dcss_enable_dtg_and_ss(struct dcss_dev *dcss)
54 {
55 if (dcss->disable_callback)
56 dcss->disable_callback = NULL;
57
58 dcss_dtg_enable(dcss->dtg);
59 dcss_ss_enable(dcss->ss);
60 }
61
dcss_submodules_init(struct dcss_dev * dcss)62 static int dcss_submodules_init(struct dcss_dev *dcss)
63 {
64 int ret = 0;
65 u32 base_addr = dcss->start_addr;
66 const struct dcss_type_data *devtype = dcss->devtype;
67
68 dcss_clocks_enable(dcss);
69
70 ret = dcss_blkctl_init(dcss, base_addr + devtype->blkctl_ofs);
71 if (ret)
72 return ret;
73
74 ret = dcss_ctxld_init(dcss, base_addr + devtype->ctxld_ofs);
75 if (ret)
76 goto ctxld_err;
77
78 ret = dcss_dtg_init(dcss, base_addr + devtype->dtg_ofs);
79 if (ret)
80 goto dtg_err;
81
82 ret = dcss_ss_init(dcss, base_addr + devtype->ss_ofs);
83 if (ret)
84 goto ss_err;
85
86 ret = dcss_dpr_init(dcss, base_addr + devtype->dpr_ofs);
87 if (ret)
88 goto dpr_err;
89
90 ret = dcss_scaler_init(dcss, base_addr + devtype->scaler_ofs);
91 if (ret)
92 goto scaler_err;
93
94 dcss_clocks_disable(dcss);
95
96 return 0;
97
98 scaler_err:
99 dcss_dpr_exit(dcss->dpr);
100
101 dpr_err:
102 dcss_ss_exit(dcss->ss);
103
104 ss_err:
105 dcss_dtg_exit(dcss->dtg);
106
107 dtg_err:
108 dcss_ctxld_exit(dcss->ctxld);
109
110 ctxld_err:
111 dcss_blkctl_exit(dcss->blkctl);
112
113 dcss_clocks_disable(dcss);
114
115 return ret;
116 }
117
dcss_submodules_stop(struct dcss_dev * dcss)118 static void dcss_submodules_stop(struct dcss_dev *dcss)
119 {
120 dcss_clocks_enable(dcss);
121 dcss_scaler_exit(dcss->scaler);
122 dcss_dpr_exit(dcss->dpr);
123 dcss_ss_exit(dcss->ss);
124 dcss_dtg_exit(dcss->dtg);
125 dcss_ctxld_exit(dcss->ctxld);
126 dcss_blkctl_exit(dcss->blkctl);
127 dcss_clocks_disable(dcss);
128 }
129
dcss_clks_init(struct dcss_dev * dcss)130 static int dcss_clks_init(struct dcss_dev *dcss)
131 {
132 int i;
133 struct {
134 const char *id;
135 struct clk **clk;
136 } clks[] = {
137 {"apb", &dcss->apb_clk},
138 {"axi", &dcss->axi_clk},
139 {"pix", &dcss->pix_clk},
140 {"rtrm", &dcss->rtrm_clk},
141 {"dtrc", &dcss->dtrc_clk},
142 };
143
144 for (i = 0; i < ARRAY_SIZE(clks); i++) {
145 *clks[i].clk = devm_clk_get(dcss->dev, clks[i].id);
146 if (IS_ERR(*clks[i].clk)) {
147 dev_err(dcss->dev, "failed to get %s clock\n",
148 clks[i].id);
149 return PTR_ERR(*clks[i].clk);
150 }
151 }
152
153 return 0;
154 }
155
dcss_clks_release(struct dcss_dev * dcss)156 static void dcss_clks_release(struct dcss_dev *dcss)
157 {
158 devm_clk_put(dcss->dev, dcss->dtrc_clk);
159 devm_clk_put(dcss->dev, dcss->rtrm_clk);
160 devm_clk_put(dcss->dev, dcss->pix_clk);
161 devm_clk_put(dcss->dev, dcss->axi_clk);
162 devm_clk_put(dcss->dev, dcss->apb_clk);
163 }
164
dcss_dev_create(struct device * dev,bool hdmi_output)165 struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
166 {
167 struct platform_device *pdev = to_platform_device(dev);
168 int ret;
169 struct resource *res;
170 struct dcss_dev *dcss;
171 const struct dcss_type_data *devtype;
172
173 devtype = of_device_get_match_data(dev);
174 if (!devtype) {
175 dev_err(dev, "no device match found\n");
176 return ERR_PTR(-ENODEV);
177 }
178
179 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
180 if (!res) {
181 dev_err(dev, "cannot get memory resource\n");
182 return ERR_PTR(-EINVAL);
183 }
184
185 dcss = kzalloc(sizeof(*dcss), GFP_KERNEL);
186 if (!dcss)
187 return ERR_PTR(-ENOMEM);
188
189 dcss->dev = dev;
190 dcss->devtype = devtype;
191 dcss->hdmi_output = hdmi_output;
192
193 ret = dcss_clks_init(dcss);
194 if (ret) {
195 dev_err(dev, "clocks initialization failed\n");
196 goto err;
197 }
198
199 dcss->of_port = of_graph_get_port_by_id(dev->of_node, 0);
200 if (!dcss->of_port) {
201 dev_err(dev, "no port@0 node in %s\n", dev->of_node->full_name);
202 ret = -ENODEV;
203 goto clks_err;
204 }
205
206 dcss->start_addr = res->start;
207
208 ret = dcss_submodules_init(dcss);
209 if (ret) {
210 of_node_put(dcss->of_port);
211 dev_err(dev, "submodules initialization failed\n");
212 goto clks_err;
213 }
214
215 init_completion(&dcss->disable_completion);
216
217 pm_runtime_set_autosuspend_delay(dev, 100);
218 pm_runtime_use_autosuspend(dev);
219 pm_runtime_set_suspended(dev);
220 pm_runtime_allow(dev);
221 pm_runtime_enable(dev);
222
223 return dcss;
224
225 clks_err:
226 dcss_clks_release(dcss);
227
228 err:
229 kfree(dcss);
230
231 return ERR_PTR(ret);
232 }
233
dcss_dev_destroy(struct dcss_dev * dcss)234 void dcss_dev_destroy(struct dcss_dev *dcss)
235 {
236 if (!pm_runtime_suspended(dcss->dev)) {
237 dcss_ctxld_suspend(dcss->ctxld);
238 dcss_clocks_disable(dcss);
239 }
240
241 of_node_put(dcss->of_port);
242
243 pm_runtime_disable(dcss->dev);
244
245 dcss_submodules_stop(dcss);
246
247 dcss_clks_release(dcss);
248
249 kfree(dcss);
250 }
251
252 #ifdef CONFIG_PM_SLEEP
dcss_dev_suspend(struct device * dev)253 int dcss_dev_suspend(struct device *dev)
254 {
255 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
256 struct drm_device *ddev = dcss_drv_dev_to_drm(dev);
257 struct dcss_kms_dev *kms = container_of(ddev, struct dcss_kms_dev, base);
258 int ret;
259
260 drm_bridge_connector_disable_hpd(kms->connector);
261
262 drm_mode_config_helper_suspend(ddev);
263
264 if (pm_runtime_suspended(dev))
265 return 0;
266
267 ret = dcss_ctxld_suspend(dcss->ctxld);
268 if (ret)
269 return ret;
270
271 dcss_clocks_disable(dcss);
272
273 return 0;
274 }
275
dcss_dev_resume(struct device * dev)276 int dcss_dev_resume(struct device *dev)
277 {
278 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
279 struct drm_device *ddev = dcss_drv_dev_to_drm(dev);
280 struct dcss_kms_dev *kms = container_of(ddev, struct dcss_kms_dev, base);
281
282 if (pm_runtime_suspended(dev)) {
283 drm_mode_config_helper_resume(ddev);
284 return 0;
285 }
286
287 dcss_clocks_enable(dcss);
288
289 dcss_blkctl_cfg(dcss->blkctl);
290
291 dcss_ctxld_resume(dcss->ctxld);
292
293 drm_mode_config_helper_resume(ddev);
294
295 drm_bridge_connector_enable_hpd(kms->connector);
296
297 return 0;
298 }
299 #endif /* CONFIG_PM_SLEEP */
300
301 #ifdef CONFIG_PM
dcss_dev_runtime_suspend(struct device * dev)302 int dcss_dev_runtime_suspend(struct device *dev)
303 {
304 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
305 int ret;
306
307 ret = dcss_ctxld_suspend(dcss->ctxld);
308 if (ret)
309 return ret;
310
311 dcss_clocks_disable(dcss);
312
313 return 0;
314 }
315
dcss_dev_runtime_resume(struct device * dev)316 int dcss_dev_runtime_resume(struct device *dev)
317 {
318 struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
319
320 dcss_clocks_enable(dcss);
321
322 dcss_blkctl_cfg(dcss->blkctl);
323
324 dcss_ctxld_resume(dcss->ctxld);
325
326 return 0;
327 }
328 #endif /* CONFIG_PM */
329