1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-17 Intel Corporation.
3 
4 /*
5  * MIPI Discovery And Configuration (DisCo) Specification for SoundWire
6  * specifies properties to be implemented for SoundWire Masters and Slaves.
7  * The DisCo spec doesn't mandate these properties. However, SDW bus cannot
8  * work without knowing these values.
9  *
10  * The helper functions read the Master and Slave properties. Implementers
11  * of Master or Slave drivers can use any of the below three mechanisms:
12  *    a) Use these APIs here as .read_prop() callback for Master and Slave
13  *    b) Implement own methods and set those as .read_prop(), but invoke
14  *    APIs in this file for generic read and override the values with
15  *    platform specific data
16  *    c) Implement ones own methods which do not use anything provided
17  *    here
18  */
19 
20 #include <linux/device.h>
21 #include <linux/property.h>
22 #include <linux/mod_devicetable.h>
23 #include <linux/soundwire/sdw.h>
24 #include "bus.h"
25 
26 /**
27  * sdw_master_read_prop() - Read Master properties
28  * @bus: SDW bus instance
29  */
sdw_master_read_prop(struct sdw_bus * bus)30 int sdw_master_read_prop(struct sdw_bus *bus)
31 {
32 	struct sdw_master_prop *prop = &bus->prop;
33 	struct fwnode_handle *link;
34 	char name[32];
35 	int nval, i;
36 
37 	device_property_read_u32(bus->dev,
38 				 "mipi-sdw-sw-interface-revision",
39 				 &prop->revision);
40 
41 	/* Find master handle */
42 	snprintf(name, sizeof(name),
43 		 "mipi-sdw-link-%d-subproperties", bus->link_id);
44 
45 	link = device_get_named_child_node(bus->dev, name);
46 	if (!link) {
47 		dev_err(bus->dev, "Master node %s not found\n", name);
48 		return -EIO;
49 	}
50 
51 	if (fwnode_property_read_bool(link,
52 				      "mipi-sdw-clock-stop-mode0-supported"))
53 		prop->clk_stop_modes |= BIT(SDW_CLK_STOP_MODE0);
54 
55 	if (fwnode_property_read_bool(link,
56 				      "mipi-sdw-clock-stop-mode1-supported"))
57 		prop->clk_stop_modes |= BIT(SDW_CLK_STOP_MODE1);
58 
59 	fwnode_property_read_u32(link,
60 				 "mipi-sdw-max-clock-frequency",
61 				 &prop->max_clk_freq);
62 
63 	nval = fwnode_property_count_u32(link, "mipi-sdw-clock-frequencies-supported");
64 	if (nval > 0) {
65 		prop->num_clk_freq = nval;
66 		prop->clk_freq = devm_kcalloc(bus->dev, prop->num_clk_freq,
67 					      sizeof(*prop->clk_freq),
68 					      GFP_KERNEL);
69 		if (!prop->clk_freq)
70 			return -ENOMEM;
71 
72 		fwnode_property_read_u32_array(link,
73 				"mipi-sdw-clock-frequencies-supported",
74 				prop->clk_freq, prop->num_clk_freq);
75 	}
76 
77 	/*
78 	 * Check the frequencies supported. If FW doesn't provide max
79 	 * freq, then populate here by checking values.
80 	 */
81 	if (!prop->max_clk_freq && prop->clk_freq) {
82 		prop->max_clk_freq = prop->clk_freq[0];
83 		for (i = 1; i < prop->num_clk_freq; i++) {
84 			if (prop->clk_freq[i] > prop->max_clk_freq)
85 				prop->max_clk_freq = prop->clk_freq[i];
86 		}
87 	}
88 
89 	nval = fwnode_property_count_u32(link, "mipi-sdw-supported-clock-gears");
90 	if (nval > 0) {
91 		prop->num_clk_gears = nval;
92 		prop->clk_gears = devm_kcalloc(bus->dev, prop->num_clk_gears,
93 					       sizeof(*prop->clk_gears),
94 					       GFP_KERNEL);
95 		if (!prop->clk_gears)
96 			return -ENOMEM;
97 
98 		fwnode_property_read_u32_array(link,
99 					       "mipi-sdw-supported-clock-gears",
100 					       prop->clk_gears,
101 					       prop->num_clk_gears);
102 	}
103 
104 	fwnode_property_read_u32(link, "mipi-sdw-default-frame-rate",
105 				 &prop->default_frame_rate);
106 
107 	fwnode_property_read_u32(link, "mipi-sdw-default-frame-row-size",
108 				 &prop->default_row);
109 
110 	fwnode_property_read_u32(link, "mipi-sdw-default-frame-col-size",
111 				 &prop->default_col);
112 
113 	prop->dynamic_frame =  fwnode_property_read_bool(link,
114 			"mipi-sdw-dynamic-frame-shape");
115 
116 	fwnode_property_read_u32(link, "mipi-sdw-command-error-threshold",
117 				 &prop->err_threshold);
118 
119 	return 0;
120 }
121 EXPORT_SYMBOL(sdw_master_read_prop);
122 
sdw_slave_read_dp0(struct sdw_slave * slave,struct fwnode_handle * port,struct sdw_dp0_prop * dp0)123 static int sdw_slave_read_dp0(struct sdw_slave *slave,
124 			      struct fwnode_handle *port,
125 			      struct sdw_dp0_prop *dp0)
126 {
127 	int nval;
128 
129 	fwnode_property_read_u32(port, "mipi-sdw-port-max-wordlength",
130 				 &dp0->max_word);
131 
132 	fwnode_property_read_u32(port, "mipi-sdw-port-min-wordlength",
133 				 &dp0->min_word);
134 
135 	nval = fwnode_property_count_u32(port, "mipi-sdw-port-wordlength-configs");
136 	if (nval > 0) {
137 
138 		dp0->num_words = nval;
139 		dp0->words = devm_kcalloc(&slave->dev,
140 					  dp0->num_words, sizeof(*dp0->words),
141 					  GFP_KERNEL);
142 		if (!dp0->words)
143 			return -ENOMEM;
144 
145 		fwnode_property_read_u32_array(port,
146 				"mipi-sdw-port-wordlength-configs",
147 				dp0->words, dp0->num_words);
148 	}
149 
150 	dp0->BRA_flow_controlled = fwnode_property_read_bool(port,
151 				"mipi-sdw-bra-flow-controlled");
152 
153 	dp0->simple_ch_prep_sm = fwnode_property_read_bool(port,
154 				"mipi-sdw-simplified-channel-prepare-sm");
155 
156 	dp0->imp_def_interrupts = fwnode_property_read_bool(port,
157 				"mipi-sdw-imp-def-dp0-interrupts-supported");
158 
159 	return 0;
160 }
161 
sdw_slave_read_dpn(struct sdw_slave * slave,struct sdw_dpn_prop * dpn,int count,int ports,char * type)162 static int sdw_slave_read_dpn(struct sdw_slave *slave,
163 			      struct sdw_dpn_prop *dpn, int count, int ports,
164 			      char *type)
165 {
166 	struct fwnode_handle *node;
167 	u32 bit, i = 0;
168 	int nval;
169 	unsigned long addr;
170 	char name[40];
171 
172 	addr = ports;
173 	/* valid ports are 1 to 14 so apply mask */
174 	addr &= GENMASK(14, 1);
175 
176 	for_each_set_bit(bit, &addr, 32) {
177 		snprintf(name, sizeof(name),
178 			 "mipi-sdw-dp-%d-%s-subproperties", bit, type);
179 
180 		dpn[i].num = bit;
181 
182 		node = device_get_named_child_node(&slave->dev, name);
183 		if (!node) {
184 			dev_err(&slave->dev, "%s dpN not found\n", name);
185 			return -EIO;
186 		}
187 
188 		fwnode_property_read_u32(node, "mipi-sdw-port-max-wordlength",
189 					 &dpn[i].max_word);
190 		fwnode_property_read_u32(node, "mipi-sdw-port-min-wordlength",
191 					 &dpn[i].min_word);
192 
193 		nval = fwnode_property_count_u32(node, "mipi-sdw-port-wordlength-configs");
194 		if (nval > 0) {
195 			dpn[i].num_words = nval;
196 			dpn[i].words = devm_kcalloc(&slave->dev,
197 						    dpn[i].num_words,
198 						    sizeof(*dpn[i].words),
199 						    GFP_KERNEL);
200 			if (!dpn[i].words)
201 				return -ENOMEM;
202 
203 			fwnode_property_read_u32_array(node,
204 					"mipi-sdw-port-wordlength-configs",
205 					dpn[i].words, dpn[i].num_words);
206 		}
207 
208 		fwnode_property_read_u32(node, "mipi-sdw-data-port-type",
209 					 &dpn[i].type);
210 
211 		fwnode_property_read_u32(node,
212 					 "mipi-sdw-max-grouping-supported",
213 					 &dpn[i].max_grouping);
214 
215 		dpn[i].simple_ch_prep_sm = fwnode_property_read_bool(node,
216 				"mipi-sdw-simplified-channelprepare-sm");
217 
218 		fwnode_property_read_u32(node,
219 					 "mipi-sdw-port-channelprepare-timeout",
220 					 &dpn[i].ch_prep_timeout);
221 
222 		fwnode_property_read_u32(node,
223 				"mipi-sdw-imp-def-dpn-interrupts-supported",
224 				&dpn[i].imp_def_interrupts);
225 
226 		fwnode_property_read_u32(node, "mipi-sdw-min-channel-number",
227 					 &dpn[i].min_ch);
228 
229 		fwnode_property_read_u32(node, "mipi-sdw-max-channel-number",
230 					 &dpn[i].max_ch);
231 
232 		nval = fwnode_property_count_u32(node, "mipi-sdw-channel-number-list");
233 		if (nval > 0) {
234 			dpn[i].num_channels = nval;
235 			dpn[i].channels = devm_kcalloc(&slave->dev,
236 						       dpn[i].num_channels,
237 						       sizeof(*dpn[i].channels),
238 						 GFP_KERNEL);
239 			if (!dpn[i].channels)
240 				return -ENOMEM;
241 
242 			fwnode_property_read_u32_array(node,
243 					"mipi-sdw-channel-number-list",
244 					dpn[i].channels, dpn[i].num_channels);
245 		}
246 
247 		nval = fwnode_property_count_u32(node, "mipi-sdw-channel-combination-list");
248 		if (nval > 0) {
249 			dpn[i].num_ch_combinations = nval;
250 			dpn[i].ch_combinations = devm_kcalloc(&slave->dev,
251 					dpn[i].num_ch_combinations,
252 					sizeof(*dpn[i].ch_combinations),
253 					GFP_KERNEL);
254 			if (!dpn[i].ch_combinations)
255 				return -ENOMEM;
256 
257 			fwnode_property_read_u32_array(node,
258 					"mipi-sdw-channel-combination-list",
259 					dpn[i].ch_combinations,
260 					dpn[i].num_ch_combinations);
261 		}
262 
263 		fwnode_property_read_u32(node,
264 				"mipi-sdw-modes-supported", &dpn[i].modes);
265 
266 		fwnode_property_read_u32(node, "mipi-sdw-max-async-buffer",
267 					 &dpn[i].max_async_buffer);
268 
269 		dpn[i].block_pack_mode = fwnode_property_read_bool(node,
270 				"mipi-sdw-block-packing-mode");
271 
272 		fwnode_property_read_u32(node, "mipi-sdw-port-encoding-type",
273 					 &dpn[i].port_encoding);
274 
275 		/* TODO: Read audio mode */
276 
277 		i++;
278 	}
279 
280 	return 0;
281 }
282 
283 /**
284  * sdw_slave_read_prop() - Read Slave properties
285  * @slave: SDW Slave
286  */
sdw_slave_read_prop(struct sdw_slave * slave)287 int sdw_slave_read_prop(struct sdw_slave *slave)
288 {
289 	struct sdw_slave_prop *prop = &slave->prop;
290 	struct device *dev = &slave->dev;
291 	struct fwnode_handle *port;
292 	int nval;
293 
294 	device_property_read_u32(dev, "mipi-sdw-sw-interface-revision",
295 				 &prop->mipi_revision);
296 
297 	prop->wake_capable = device_property_read_bool(dev,
298 				"mipi-sdw-wake-up-unavailable");
299 	prop->wake_capable = !prop->wake_capable;
300 
301 	prop->test_mode_capable = device_property_read_bool(dev,
302 				"mipi-sdw-test-mode-supported");
303 
304 	prop->clk_stop_mode1 = false;
305 	if (device_property_read_bool(dev,
306 				"mipi-sdw-clock-stop-mode1-supported"))
307 		prop->clk_stop_mode1 = true;
308 
309 	prop->simple_clk_stop_capable = device_property_read_bool(dev,
310 			"mipi-sdw-simplified-clockstopprepare-sm-supported");
311 
312 	device_property_read_u32(dev, "mipi-sdw-clockstopprepare-timeout",
313 				 &prop->clk_stop_timeout);
314 
315 	device_property_read_u32(dev, "mipi-sdw-slave-channelprepare-timeout",
316 				 &prop->ch_prep_timeout);
317 
318 	device_property_read_u32(dev,
319 			"mipi-sdw-clockstopprepare-hard-reset-behavior",
320 			&prop->reset_behave);
321 
322 	prop->high_PHY_capable = device_property_read_bool(dev,
323 			"mipi-sdw-highPHY-capable");
324 
325 	prop->paging_support = device_property_read_bool(dev,
326 			"mipi-sdw-paging-support");
327 
328 	prop->bank_delay_support = device_property_read_bool(dev,
329 			"mipi-sdw-bank-delay-support");
330 
331 	device_property_read_u32(dev,
332 			"mipi-sdw-port15-read-behavior", &prop->p15_behave);
333 
334 	device_property_read_u32(dev, "mipi-sdw-master-count",
335 				 &prop->master_count);
336 
337 	device_property_read_u32(dev, "mipi-sdw-source-port-list",
338 				 &prop->source_ports);
339 
340 	device_property_read_u32(dev, "mipi-sdw-sink-port-list",
341 				 &prop->sink_ports);
342 
343 	/* Read dp0 properties */
344 	port = device_get_named_child_node(dev, "mipi-sdw-dp-0-subproperties");
345 	if (!port) {
346 		dev_dbg(dev, "DP0 node not found!!\n");
347 	} else {
348 		prop->dp0_prop = devm_kzalloc(&slave->dev,
349 					      sizeof(*prop->dp0_prop),
350 					      GFP_KERNEL);
351 		if (!prop->dp0_prop)
352 			return -ENOMEM;
353 
354 		sdw_slave_read_dp0(slave, port, prop->dp0_prop);
355 	}
356 
357 	/*
358 	 * Based on each DPn port, get source and sink dpn properties.
359 	 * Also, some ports can operate as both source or sink.
360 	 */
361 
362 	/* Allocate memory for set bits in port lists */
363 	nval = hweight32(prop->source_ports);
364 	prop->src_dpn_prop = devm_kcalloc(&slave->dev, nval,
365 					  sizeof(*prop->src_dpn_prop),
366 					  GFP_KERNEL);
367 	if (!prop->src_dpn_prop)
368 		return -ENOMEM;
369 
370 	/* Read dpn properties for source port(s) */
371 	sdw_slave_read_dpn(slave, prop->src_dpn_prop, nval,
372 			   prop->source_ports, "source");
373 
374 	nval = hweight32(prop->sink_ports);
375 	prop->sink_dpn_prop = devm_kcalloc(&slave->dev, nval,
376 					   sizeof(*prop->sink_dpn_prop),
377 					   GFP_KERNEL);
378 	if (!prop->sink_dpn_prop)
379 		return -ENOMEM;
380 
381 	/* Read dpn properties for sink port(s) */
382 	sdw_slave_read_dpn(slave, prop->sink_dpn_prop, nval,
383 			   prop->sink_ports, "sink");
384 
385 	return 0;
386 }
387 EXPORT_SYMBOL(sdw_slave_read_prop);
388