Merge tag 'kvm-riscv-6.4-1' of https://github.com/kvm-riscv/linux into HEAD
[platform/kernel/linux-starfive.git] / drivers / gpu / drm / msm / dp / dp_parser.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
4  */
5
6 #include <linux/of_gpio.h>
7 #include <linux/phy/phy.h>
8
9 #include <drm/drm_of.h>
10 #include <drm/drm_print.h>
11 #include <drm/drm_bridge.h>
12
13 #include "dp_parser.h"
14 #include "dp_reg.h"
15
16 #define DP_DEFAULT_AHB_OFFSET   0x0000
17 #define DP_DEFAULT_AHB_SIZE     0x0200
18 #define DP_DEFAULT_AUX_OFFSET   0x0200
19 #define DP_DEFAULT_AUX_SIZE     0x0200
20 #define DP_DEFAULT_LINK_OFFSET  0x0400
21 #define DP_DEFAULT_LINK_SIZE    0x0C00
22 #define DP_DEFAULT_P0_OFFSET    0x1000
23 #define DP_DEFAULT_P0_SIZE      0x0400
24
25 static void __iomem *dp_ioremap(struct platform_device *pdev, int idx, size_t *len)
26 {
27         struct resource *res;
28         void __iomem *base;
29
30         base = devm_platform_get_and_ioremap_resource(pdev, idx, &res);
31         if (!IS_ERR(base))
32                 *len = resource_size(res);
33
34         return base;
35 }
36
37 static int dp_parser_ctrl_res(struct dp_parser *parser)
38 {
39         struct platform_device *pdev = parser->pdev;
40         struct dp_io *io = &parser->io;
41         struct dss_io_data *dss = &io->dp_controller;
42
43         dss->ahb.base = dp_ioremap(pdev, 0, &dss->ahb.len);
44         if (IS_ERR(dss->ahb.base))
45                 return PTR_ERR(dss->ahb.base);
46
47         dss->aux.base = dp_ioremap(pdev, 1, &dss->aux.len);
48         if (IS_ERR(dss->aux.base)) {
49                 /*
50                  * The initial binding had a single reg, but in order to
51                  * support variation in the sub-region sizes this was split.
52                  * dp_ioremap() will fail with -EINVAL here if only a single
53                  * reg is specified, so fill in the sub-region offsets and
54                  * lengths based on this single region.
55                  */
56                 if (PTR_ERR(dss->aux.base) == -EINVAL) {
57                         if (dss->ahb.len < DP_DEFAULT_P0_OFFSET + DP_DEFAULT_P0_SIZE) {
58                                 DRM_ERROR("legacy memory region not large enough\n");
59                                 return -EINVAL;
60                         }
61
62                         dss->ahb.len = DP_DEFAULT_AHB_SIZE;
63                         dss->aux.base = dss->ahb.base + DP_DEFAULT_AUX_OFFSET;
64                         dss->aux.len = DP_DEFAULT_AUX_SIZE;
65                         dss->link.base = dss->ahb.base + DP_DEFAULT_LINK_OFFSET;
66                         dss->link.len = DP_DEFAULT_LINK_SIZE;
67                         dss->p0.base = dss->ahb.base + DP_DEFAULT_P0_OFFSET;
68                         dss->p0.len = DP_DEFAULT_P0_SIZE;
69                 } else {
70                         DRM_ERROR("unable to remap aux region: %pe\n", dss->aux.base);
71                         return PTR_ERR(dss->aux.base);
72                 }
73         } else {
74                 dss->link.base = dp_ioremap(pdev, 2, &dss->link.len);
75                 if (IS_ERR(dss->link.base)) {
76                         DRM_ERROR("unable to remap link region: %pe\n", dss->link.base);
77                         return PTR_ERR(dss->link.base);
78                 }
79
80                 dss->p0.base = dp_ioremap(pdev, 3, &dss->p0.len);
81                 if (IS_ERR(dss->p0.base)) {
82                         DRM_ERROR("unable to remap p0 region: %pe\n", dss->p0.base);
83                         return PTR_ERR(dss->p0.base);
84                 }
85         }
86
87         io->phy = devm_phy_get(&pdev->dev, "dp");
88         if (IS_ERR(io->phy))
89                 return PTR_ERR(io->phy);
90
91         return 0;
92 }
93
94 static u32 dp_parser_link_frequencies(struct device_node *of_node)
95 {
96         struct device_node *endpoint;
97         u64 frequency = 0;
98         int cnt;
99
100         endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */
101         if (!endpoint)
102                 return 0;
103
104         cnt = of_property_count_u64_elems(endpoint, "link-frequencies");
105
106         if (cnt > 0)
107                 of_property_read_u64_index(endpoint, "link-frequencies",
108                                                 cnt - 1, &frequency);
109         of_node_put(endpoint);
110
111         do_div(frequency,
112                 10 * /* from symbol rate to link rate */
113                 1000); /* kbytes */
114
115         return frequency;
116 }
117
118 static int dp_parser_misc(struct dp_parser *parser)
119 {
120         struct device_node *of_node = parser->pdev->dev.of_node;
121         int cnt;
122
123         /*
124          * data-lanes is the property of dp_out endpoint
125          */
126         cnt = drm_of_get_data_lanes_count_ep(of_node, 1, 0, 1, DP_MAX_NUM_DP_LANES);
127         if (cnt < 0) {
128                 /* legacy code, data-lanes is the property of mdss_dp node */
129                 cnt = drm_of_get_data_lanes_count(of_node, 1, DP_MAX_NUM_DP_LANES);
130         }
131
132         if (cnt > 0)
133                 parser->max_dp_lanes = cnt;
134         else
135                 parser->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */
136
137         parser->max_dp_link_rate = dp_parser_link_frequencies(of_node);
138         if (!parser->max_dp_link_rate)
139                 parser->max_dp_link_rate = DP_LINK_RATE_HBR2;
140
141         return 0;
142 }
143
144 static inline bool dp_parser_check_prefix(const char *clk_prefix,
145                                                 const char *clk_name)
146 {
147         return !strncmp(clk_prefix, clk_name, strlen(clk_prefix));
148 }
149
150 static int dp_parser_init_clk_data(struct dp_parser *parser)
151 {
152         int num_clk, i, rc;
153         int core_clk_count = 0, ctrl_clk_count = 0, stream_clk_count = 0;
154         const char *clk_name;
155         struct device *dev = &parser->pdev->dev;
156         struct dss_module_power *core_power = &parser->mp[DP_CORE_PM];
157         struct dss_module_power *ctrl_power = &parser->mp[DP_CTRL_PM];
158         struct dss_module_power *stream_power = &parser->mp[DP_STREAM_PM];
159
160         num_clk = of_property_count_strings(dev->of_node, "clock-names");
161         if (num_clk <= 0) {
162                 DRM_ERROR("no clocks are defined\n");
163                 return -EINVAL;
164         }
165
166         for (i = 0; i < num_clk; i++) {
167                 rc = of_property_read_string_index(dev->of_node,
168                                 "clock-names", i, &clk_name);
169                 if (rc < 0)
170                         return rc;
171
172                 if (dp_parser_check_prefix("core", clk_name))
173                         core_clk_count++;
174
175                 if (dp_parser_check_prefix("ctrl", clk_name))
176                         ctrl_clk_count++;
177
178                 if (dp_parser_check_prefix("stream", clk_name))
179                         stream_clk_count++;
180         }
181
182         /* Initialize the CORE power module */
183         if (core_clk_count == 0) {
184                 DRM_ERROR("no core clocks are defined\n");
185                 return -EINVAL;
186         }
187
188         core_power->num_clk = core_clk_count;
189         core_power->clocks = devm_kcalloc(dev,
190                         core_power->num_clk, sizeof(struct clk_bulk_data),
191                         GFP_KERNEL);
192         if (!core_power->clocks)
193                 return -ENOMEM;
194
195         /* Initialize the CTRL power module */
196         if (ctrl_clk_count == 0) {
197                 DRM_ERROR("no ctrl clocks are defined\n");
198                 return -EINVAL;
199         }
200
201         ctrl_power->num_clk = ctrl_clk_count;
202         ctrl_power->clocks = devm_kcalloc(dev,
203                         ctrl_power->num_clk, sizeof(struct clk_bulk_data),
204                         GFP_KERNEL);
205         if (!ctrl_power->clocks) {
206                 ctrl_power->num_clk = 0;
207                 return -ENOMEM;
208         }
209
210         /* Initialize the STREAM power module */
211         if (stream_clk_count == 0) {
212                 DRM_ERROR("no stream (pixel) clocks are defined\n");
213                 return -EINVAL;
214         }
215
216         stream_power->num_clk = stream_clk_count;
217         stream_power->clocks = devm_kcalloc(dev,
218                         stream_power->num_clk, sizeof(struct clk_bulk_data),
219                         GFP_KERNEL);
220         if (!stream_power->clocks) {
221                 stream_power->num_clk = 0;
222                 return -ENOMEM;
223         }
224
225         return 0;
226 }
227
228 static int dp_parser_clock(struct dp_parser *parser)
229 {
230         int rc = 0, i = 0;
231         int num_clk = 0;
232         int core_clk_index = 0, ctrl_clk_index = 0, stream_clk_index = 0;
233         int core_clk_count = 0, ctrl_clk_count = 0, stream_clk_count = 0;
234         const char *clk_name;
235         struct device *dev = &parser->pdev->dev;
236         struct dss_module_power *core_power = &parser->mp[DP_CORE_PM];
237         struct dss_module_power *ctrl_power = &parser->mp[DP_CTRL_PM];
238         struct dss_module_power *stream_power = &parser->mp[DP_STREAM_PM];
239
240         rc =  dp_parser_init_clk_data(parser);
241         if (rc) {
242                 DRM_ERROR("failed to initialize power data %d\n", rc);
243                 return -EINVAL;
244         }
245
246         core_clk_count = core_power->num_clk;
247         ctrl_clk_count = ctrl_power->num_clk;
248         stream_clk_count = stream_power->num_clk;
249
250         num_clk = core_clk_count + ctrl_clk_count + stream_clk_count;
251
252         for (i = 0; i < num_clk; i++) {
253                 rc = of_property_read_string_index(dev->of_node, "clock-names",
254                                 i, &clk_name);
255                 if (rc) {
256                         DRM_ERROR("error reading clock-names %d\n", rc);
257                         return rc;
258                 }
259                 if (dp_parser_check_prefix("core", clk_name) &&
260                                 core_clk_index < core_clk_count) {
261                         core_power->clocks[core_clk_index].id = devm_kstrdup(dev, clk_name, GFP_KERNEL);
262                         core_clk_index++;
263                 } else if (dp_parser_check_prefix("stream", clk_name) &&
264                                 stream_clk_index < stream_clk_count) {
265                         stream_power->clocks[stream_clk_index].id = devm_kstrdup(dev, clk_name, GFP_KERNEL);
266                         stream_clk_index++;
267                 } else if (dp_parser_check_prefix("ctrl", clk_name) &&
268                            ctrl_clk_index < ctrl_clk_count) {
269                         ctrl_power->clocks[ctrl_clk_index].id = devm_kstrdup(dev, clk_name, GFP_KERNEL);
270                         ctrl_clk_index++;
271                 }
272         }
273
274         return 0;
275 }
276
277 int devm_dp_parser_find_next_bridge(struct device *dev, struct dp_parser *parser)
278 {
279         struct platform_device *pdev = parser->pdev;
280         struct drm_bridge *bridge;
281
282         bridge = devm_drm_of_get_bridge(dev, pdev->dev.of_node, 1, 0);
283         if (IS_ERR(bridge))
284                 return PTR_ERR(bridge);
285
286         parser->next_bridge = bridge;
287
288         return 0;
289 }
290
291 static int dp_parser_parse(struct dp_parser *parser)
292 {
293         int rc = 0;
294
295         if (!parser) {
296                 DRM_ERROR("invalid input\n");
297                 return -EINVAL;
298         }
299
300         rc = dp_parser_ctrl_res(parser);
301         if (rc)
302                 return rc;
303
304         rc = dp_parser_misc(parser);
305         if (rc)
306                 return rc;
307
308         rc = dp_parser_clock(parser);
309         if (rc)
310                 return rc;
311
312         return 0;
313 }
314
315 struct dp_parser *dp_parser_get(struct platform_device *pdev)
316 {
317         struct dp_parser *parser;
318
319         parser = devm_kzalloc(&pdev->dev, sizeof(*parser), GFP_KERNEL);
320         if (!parser)
321                 return ERR_PTR(-ENOMEM);
322
323         parser->parse = dp_parser_parse;
324         parser->pdev = pdev;
325
326         return parser;
327 }