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1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2// Copyright(c) 2015-17 Intel Corporation.
3
4/*
5 * SDW Intel Init Routines
6 *
7 * Initializes and creates SDW devices based on ACPI and Hardware values
8 */
9
10#include <linux/acpi.h>
11#include <linux/export.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/auxiliary_bus.h>
16#include <linux/pm_runtime.h>
17#include <linux/soundwire/sdw_intel.h>
18#include "cadence_master.h"
19#include "intel.h"
20#include "intel_auxdevice.h"
21
22static void intel_link_dev_release(struct device *dev)
23{
24 struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
25 struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
26
27 kfree(ldev);
28}
29
30/* alloc, init and add link devices */
31static struct sdw_intel_link_dev *intel_link_dev_register(struct sdw_intel_res *res,
32 struct sdw_intel_ctx *ctx,
33 struct fwnode_handle *fwnode,
34 const char *name,
35 int link_id)
36{
37 struct sdw_intel_link_dev *ldev;
38 struct sdw_intel_link_res *link;
39 struct auxiliary_device *auxdev;
40 int ret;
41
42 ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
43 if (!ldev)
44 return ERR_PTR(-ENOMEM);
45
46 auxdev = &ldev->auxdev;
47 auxdev->name = name;
48 auxdev->dev.parent = res->parent;
49 auxdev->dev.fwnode = fwnode;
50 auxdev->dev.release = intel_link_dev_release;
51
52 /* we don't use an IDA since we already have a link ID */
53 auxdev->id = link_id;
54
55 /*
56 * keep a handle on the allocated memory, to be used in all other functions.
57 * Since the same pattern is used to skip links that are not enabled, there is
58 * no need to check if ctx->ldev[i] is NULL later on.
59 */
60 ctx->ldev[link_id] = ldev;
61
62 /* Add link information used in the driver probe */
63 link = &ldev->link_res;
64 link->hw_ops = res->hw_ops;
65 link->mmio_base = res->mmio_base;
66 if (!res->ext) {
67 link->registers = res->mmio_base + SDW_LINK_BASE
68 + (SDW_LINK_SIZE * link_id);
69 link->ip_offset = 0;
70 link->shim = res->mmio_base + res->shim_base;
71 link->alh = res->mmio_base + res->alh_base;
72 link->shim_lock = &ctx->shim_lock;
73 } else {
74 link->registers = res->mmio_base + SDW_IP_BASE(link_id);
75 link->ip_offset = SDW_CADENCE_MCP_IP_OFFSET;
76 link->shim = res->mmio_base + SDW_SHIM2_GENERIC_BASE(link_id);
77 link->shim_vs = res->mmio_base + SDW_SHIM2_VS_BASE(link_id);
78 link->shim_lock = res->eml_lock;
79 }
80
81 link->ops = res->ops;
82 link->dev = res->dev;
83
84 link->clock_stop_quirks = res->clock_stop_quirks;
85 link->shim_mask = &ctx->shim_mask;
86 link->link_mask = ctx->link_mask;
87
88 link->hbus = res->hbus;
89
90 /* now follow the two-step init/add sequence */
91 ret = auxiliary_device_init(auxdev);
92 if (ret < 0) {
93 dev_err(res->parent, "failed to initialize link dev %s link_id %d\n",
94 name, link_id);
95 kfree(ldev);
96 return ERR_PTR(ret);
97 }
98
99 ret = auxiliary_device_add(&ldev->auxdev);
100 if (ret < 0) {
101 dev_err(res->parent, "failed to add link dev %s link_id %d\n",
102 ldev->auxdev.name, link_id);
103 /* ldev will be freed with the put_device() and .release sequence */
104 auxiliary_device_uninit(&ldev->auxdev);
105 return ERR_PTR(ret);
106 }
107
108 return ldev;
109}
110
111static void intel_link_dev_unregister(struct sdw_intel_link_dev *ldev)
112{
113 auxiliary_device_delete(&ldev->auxdev);
114 auxiliary_device_uninit(&ldev->auxdev);
115}
116
117static int sdw_intel_cleanup(struct sdw_intel_ctx *ctx)
118{
119 struct sdw_intel_link_dev *ldev;
120 u32 link_mask;
121 int i;
122
123 link_mask = ctx->link_mask;
124
125 for (i = 0; i < ctx->count; i++) {
126 if (!(link_mask & BIT(i)))
127 continue;
128
129 ldev = ctx->ldev[i];
130
131 pm_runtime_disable(&ldev->auxdev.dev);
132 if (!ldev->link_res.clock_stop_quirks)
133 pm_runtime_put_noidle(ldev->link_res.dev);
134
135 intel_link_dev_unregister(ldev);
136 }
137
138 return 0;
139}
140
141irqreturn_t sdw_intel_thread(int irq, void *dev_id)
142{
143 struct sdw_intel_ctx *ctx = dev_id;
144 struct sdw_intel_link_res *link;
145
146 list_for_each_entry(link, &ctx->link_list, list)
147 sdw_cdns_irq(irq, link->cdns);
148
149 return IRQ_HANDLED;
150}
151EXPORT_SYMBOL_NS(sdw_intel_thread, SOUNDWIRE_INTEL_INIT);
152
153static struct sdw_intel_ctx
154*sdw_intel_probe_controller(struct sdw_intel_res *res)
155{
156 struct sdw_intel_link_res *link;
157 struct sdw_intel_link_dev *ldev;
158 struct sdw_intel_ctx *ctx;
159 struct acpi_device *adev;
160 struct sdw_slave *slave;
161 struct list_head *node;
162 struct sdw_bus *bus;
163 u32 link_mask;
164 int num_slaves = 0;
165 int count;
166 int i;
167
168 if (!res)
169 return NULL;
170
171 adev = acpi_fetch_acpi_dev(res->handle);
172 if (!adev)
173 return NULL;
174
175 if (!res->count)
176 return NULL;
177
178 count = res->count;
179 dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count);
180
181 /*
182 * we need to alloc/free memory manually and can't use devm:
183 * this routine may be called from a workqueue, and not from
184 * the parent .probe.
185 * If devm_ was used, the memory might never be freed on errors.
186 */
187 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
188 if (!ctx)
189 return NULL;
190
191 ctx->count = count;
192
193 /*
194 * allocate the array of pointers. The link-specific data is allocated
195 * as part of the first loop below and released with the auxiliary_device_uninit().
196 * If some links are disabled, the link pointer will remain NULL. Given that the
197 * number of links is small, this is simpler than using a list to keep track of links.
198 */
199 ctx->ldev = kcalloc(ctx->count, sizeof(*ctx->ldev), GFP_KERNEL);
200 if (!ctx->ldev) {
201 kfree(ctx);
202 return NULL;
203 }
204
205 ctx->mmio_base = res->mmio_base;
206 ctx->shim_base = res->shim_base;
207 ctx->alh_base = res->alh_base;
208 ctx->link_mask = res->link_mask;
209 ctx->handle = res->handle;
210 mutex_init(&ctx->shim_lock);
211
212 link_mask = ctx->link_mask;
213
214 INIT_LIST_HEAD(&ctx->link_list);
215
216 for (i = 0; i < count; i++) {
217 if (!(link_mask & BIT(i)))
218 continue;
219
220 /*
221 * init and add a device for each link
222 *
223 * The name of the device will be soundwire_intel.link.[i],
224 * with the "soundwire_intel" module prefix automatically added
225 * by the auxiliary bus core.
226 */
227 ldev = intel_link_dev_register(res,
228 ctx,
229 acpi_fwnode_handle(adev),
230 "link",
231 i);
232 if (IS_ERR(ldev))
233 goto err;
234
235 link = &ldev->link_res;
236 link->cdns = auxiliary_get_drvdata(&ldev->auxdev);
237
238 if (!link->cdns) {
239 dev_err(&adev->dev, "failed to get link->cdns\n");
240 /*
241 * 1 will be subtracted from i in the err label, but we need to call
242 * intel_link_dev_unregister for this ldev, so plus 1 now
243 */
244 i++;
245 goto err;
246 }
247 list_add_tail(&link->list, &ctx->link_list);
248 bus = &link->cdns->bus;
249 /* Calculate number of slaves */
250 list_for_each(node, &bus->slaves)
251 num_slaves++;
252 }
253
254 ctx->ids = kcalloc(num_slaves, sizeof(*ctx->ids), GFP_KERNEL);
255 if (!ctx->ids)
256 goto err;
257
258 ctx->num_slaves = num_slaves;
259 i = 0;
260 list_for_each_entry(link, &ctx->link_list, list) {
261 bus = &link->cdns->bus;
262 list_for_each_entry(slave, &bus->slaves, node) {
263 ctx->ids[i].id = slave->id;
264 ctx->ids[i].link_id = bus->link_id;
265 i++;
266 }
267 }
268
269 return ctx;
270
271err:
272 while (i--) {
273 if (!(link_mask & BIT(i)))
274 continue;
275 ldev = ctx->ldev[i];
276 intel_link_dev_unregister(ldev);
277 }
278 kfree(ctx->ldev);
279 kfree(ctx);
280 return NULL;
281}
282
283static int
284sdw_intel_startup_controller(struct sdw_intel_ctx *ctx)
285{
286 struct acpi_device *adev = acpi_fetch_acpi_dev(ctx->handle);
287 struct sdw_intel_link_dev *ldev;
288 u32 link_mask;
289 int i;
290
291 if (!adev)
292 return -EINVAL;
293
294 if (!ctx->ldev)
295 return -EINVAL;
296
297 link_mask = ctx->link_mask;
298
299 /* Startup SDW Master devices */
300 for (i = 0; i < ctx->count; i++) {
301 if (!(link_mask & BIT(i)))
302 continue;
303
304 ldev = ctx->ldev[i];
305
306 intel_link_startup(&ldev->auxdev);
307
308 if (!ldev->link_res.clock_stop_quirks) {
309 /*
310 * we need to prevent the parent PCI device
311 * from entering pm_runtime suspend, so that
312 * power rails to the SoundWire IP are not
313 * turned off.
314 */
315 pm_runtime_get_noresume(ldev->link_res.dev);
316 }
317 }
318
319 return 0;
320}
321
322/**
323 * sdw_intel_probe() - SoundWire Intel probe routine
324 * @res: resource data
325 *
326 * This registers an auxiliary device for each Master handled by the controller,
327 * and SoundWire Master and Slave devices will be created by the auxiliary
328 * device probe. All the information necessary is stored in the context, and
329 * the res argument pointer can be freed after this step.
330 * This function will be called after sdw_intel_acpi_scan() by SOF probe.
331 */
332struct sdw_intel_ctx
333*sdw_intel_probe(struct sdw_intel_res *res)
334{
335 return sdw_intel_probe_controller(res);
336}
337EXPORT_SYMBOL_NS(sdw_intel_probe, SOUNDWIRE_INTEL_INIT);
338
339/**
340 * sdw_intel_startup() - SoundWire Intel startup
341 * @ctx: SoundWire context allocated in the probe
342 *
343 * Startup Intel SoundWire controller. This function will be called after
344 * Intel Audio DSP is powered up.
345 */
346int sdw_intel_startup(struct sdw_intel_ctx *ctx)
347{
348 return sdw_intel_startup_controller(ctx);
349}
350EXPORT_SYMBOL_NS(sdw_intel_startup, SOUNDWIRE_INTEL_INIT);
351/**
352 * sdw_intel_exit() - SoundWire Intel exit
353 * @ctx: SoundWire context allocated in the probe
354 *
355 * Delete the controller instances created and cleanup
356 */
357void sdw_intel_exit(struct sdw_intel_ctx *ctx)
358{
359 sdw_intel_cleanup(ctx);
360 kfree(ctx->ids);
361 kfree(ctx->ldev);
362 kfree(ctx);
363}
364EXPORT_SYMBOL_NS(sdw_intel_exit, SOUNDWIRE_INTEL_INIT);
365
366void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx)
367{
368 struct sdw_intel_link_dev *ldev;
369 u32 link_mask;
370 int i;
371
372 if (!ctx->ldev)
373 return;
374
375 link_mask = ctx->link_mask;
376
377 /* Startup SDW Master devices */
378 for (i = 0; i < ctx->count; i++) {
379 if (!(link_mask & BIT(i)))
380 continue;
381
382 ldev = ctx->ldev[i];
383
384 intel_link_process_wakeen_event(&ldev->auxdev);
385 }
386}
387EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, SOUNDWIRE_INTEL_INIT);
388
389MODULE_LICENSE("Dual BSD/GPL");
390MODULE_DESCRIPTION("Intel Soundwire Init Library");
1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2// Copyright(c) 2015-17 Intel Corporation.
3
4/*
5 * SDW Intel Init Routines
6 *
7 * Initializes and creates SDW devices based on ACPI and Hardware values
8 */
9
10#include <linux/acpi.h>
11#include <linux/export.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/soundwire/sdw_intel.h>
17#include "cadence_master.h"
18#include "intel.h"
19
20#define SDW_LINK_TYPE 4 /* from Intel ACPI documentation */
21#define SDW_MAX_LINKS 4
22#define SDW_SHIM_LCAP 0x0
23#define SDW_SHIM_BASE 0x2C000
24#define SDW_ALH_BASE 0x2C800
25#define SDW_LINK_BASE 0x30000
26#define SDW_LINK_SIZE 0x10000
27
28static int ctrl_link_mask;
29module_param_named(sdw_link_mask, ctrl_link_mask, int, 0444);
30MODULE_PARM_DESC(sdw_link_mask, "Intel link mask (one bit per link)");
31
32static bool is_link_enabled(struct fwnode_handle *fw_node, int i)
33{
34 struct fwnode_handle *link;
35 char name[32];
36 u32 quirk_mask = 0;
37
38 /* Find master handle */
39 snprintf(name, sizeof(name),
40 "mipi-sdw-link-%d-subproperties", i);
41
42 link = fwnode_get_named_child_node(fw_node, name);
43 if (!link)
44 return false;
45
46 fwnode_property_read_u32(link,
47 "intel-quirk-mask",
48 &quirk_mask);
49
50 if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
51 return false;
52
53 return true;
54}
55
56static int sdw_intel_cleanup(struct sdw_intel_ctx *ctx)
57{
58 struct sdw_intel_link_res *link = ctx->links;
59 u32 link_mask;
60 int i;
61
62 if (!link)
63 return 0;
64
65 link_mask = ctx->link_mask;
66
67 for (i = 0; i < ctx->count; i++, link++) {
68 if (!(link_mask & BIT(i)))
69 continue;
70
71 if (link->pdev)
72 platform_device_unregister(link->pdev);
73 }
74
75 return 0;
76}
77
78static int
79sdw_intel_scan_controller(struct sdw_intel_acpi_info *info)
80{
81 struct acpi_device *adev;
82 int ret, i;
83 u8 count;
84
85 if (acpi_bus_get_device(info->handle, &adev))
86 return -EINVAL;
87
88 /* Found controller, find links supported */
89 count = 0;
90 ret = fwnode_property_read_u8_array(acpi_fwnode_handle(adev),
91 "mipi-sdw-master-count", &count, 1);
92
93 /*
94 * In theory we could check the number of links supported in
95 * hardware, but in that step we cannot assume SoundWire IP is
96 * powered.
97 *
98 * In addition, if the BIOS doesn't even provide this
99 * 'master-count' property then all the inits based on link
100 * masks will fail as well.
101 *
102 * We will check the hardware capabilities in the startup() step
103 */
104
105 if (ret) {
106 dev_err(&adev->dev,
107 "Failed to read mipi-sdw-master-count: %d\n", ret);
108 return -EINVAL;
109 }
110
111 /* Check count is within bounds */
112 if (count > SDW_MAX_LINKS) {
113 dev_err(&adev->dev, "Link count %d exceeds max %d\n",
114 count, SDW_MAX_LINKS);
115 return -EINVAL;
116 }
117
118 if (!count) {
119 dev_warn(&adev->dev, "No SoundWire links detected\n");
120 return -EINVAL;
121 }
122 dev_dbg(&adev->dev, "ACPI reports %d SDW Link devices\n", count);
123
124 info->count = count;
125 info->link_mask = 0;
126
127 for (i = 0; i < count; i++) {
128 if (ctrl_link_mask && !(ctrl_link_mask & BIT(i))) {
129 dev_dbg(&adev->dev,
130 "Link %d masked, will not be enabled\n", i);
131 continue;
132 }
133
134 if (!is_link_enabled(acpi_fwnode_handle(adev), i)) {
135 dev_dbg(&adev->dev,
136 "Link %d not selected in firmware\n", i);
137 continue;
138 }
139
140 info->link_mask |= BIT(i);
141 }
142
143 return 0;
144}
145
146#define HDA_DSP_REG_ADSPIC2 (0x10)
147#define HDA_DSP_REG_ADSPIS2 (0x14)
148#define HDA_DSP_REG_ADSPIC2_SNDW BIT(5)
149
150/**
151 * sdw_intel_enable_irq() - enable/disable Intel SoundWire IRQ
152 * @mmio_base: The mmio base of the control register
153 * @enable: true if enable
154 */
155void sdw_intel_enable_irq(void __iomem *mmio_base, bool enable)
156{
157 u32 val;
158
159 val = readl(mmio_base + HDA_DSP_REG_ADSPIC2);
160
161 if (enable)
162 val |= HDA_DSP_REG_ADSPIC2_SNDW;
163 else
164 val &= ~HDA_DSP_REG_ADSPIC2_SNDW;
165
166 writel(val, mmio_base + HDA_DSP_REG_ADSPIC2);
167}
168EXPORT_SYMBOL_NS(sdw_intel_enable_irq, SOUNDWIRE_INTEL_INIT);
169
170irqreturn_t sdw_intel_thread(int irq, void *dev_id)
171{
172 struct sdw_intel_ctx *ctx = dev_id;
173 struct sdw_intel_link_res *link;
174
175 list_for_each_entry(link, &ctx->link_list, list)
176 sdw_cdns_irq(irq, link->cdns);
177
178 sdw_intel_enable_irq(ctx->mmio_base, true);
179 return IRQ_HANDLED;
180}
181EXPORT_SYMBOL_NS(sdw_intel_thread, SOUNDWIRE_INTEL_INIT);
182
183static struct sdw_intel_ctx
184*sdw_intel_probe_controller(struct sdw_intel_res *res)
185{
186 struct platform_device_info pdevinfo;
187 struct platform_device *pdev;
188 struct sdw_intel_link_res *link;
189 struct sdw_intel_ctx *ctx;
190 struct acpi_device *adev;
191 struct sdw_slave *slave;
192 struct list_head *node;
193 struct sdw_bus *bus;
194 u32 link_mask;
195 int num_slaves = 0;
196 int count;
197 int i;
198
199 if (!res)
200 return NULL;
201
202 if (acpi_bus_get_device(res->handle, &adev))
203 return NULL;
204
205 if (!res->count)
206 return NULL;
207
208 count = res->count;
209 dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count);
210
211 ctx = devm_kzalloc(&adev->dev, sizeof(*ctx), GFP_KERNEL);
212 if (!ctx)
213 return NULL;
214
215 ctx->count = count;
216 ctx->links = devm_kcalloc(&adev->dev, ctx->count,
217 sizeof(*ctx->links), GFP_KERNEL);
218 if (!ctx->links)
219 return NULL;
220
221 ctx->count = count;
222 ctx->mmio_base = res->mmio_base;
223 ctx->link_mask = res->link_mask;
224 ctx->handle = res->handle;
225 mutex_init(&ctx->shim_lock);
226
227 link = ctx->links;
228 link_mask = ctx->link_mask;
229
230 INIT_LIST_HEAD(&ctx->link_list);
231
232 /* Create SDW Master devices */
233 for (i = 0; i < count; i++, link++) {
234 if (!(link_mask & BIT(i))) {
235 dev_dbg(&adev->dev,
236 "Link %d masked, will not be enabled\n", i);
237 continue;
238 }
239
240 link->mmio_base = res->mmio_base;
241 link->registers = res->mmio_base + SDW_LINK_BASE
242 + (SDW_LINK_SIZE * i);
243 link->shim = res->mmio_base + SDW_SHIM_BASE;
244 link->alh = res->mmio_base + SDW_ALH_BASE;
245
246 link->ops = res->ops;
247 link->dev = res->dev;
248
249 link->shim_lock = &ctx->shim_lock;
250 link->shim_mask = &ctx->shim_mask;
251
252 memset(&pdevinfo, 0, sizeof(pdevinfo));
253
254 pdevinfo.parent = res->parent;
255 pdevinfo.name = "intel-sdw";
256 pdevinfo.id = i;
257 pdevinfo.fwnode = acpi_fwnode_handle(adev);
258 pdevinfo.data = link;
259 pdevinfo.size_data = sizeof(*link);
260
261 pdev = platform_device_register_full(&pdevinfo);
262 if (IS_ERR(pdev)) {
263 dev_err(&adev->dev,
264 "platform device creation failed: %ld\n",
265 PTR_ERR(pdev));
266 goto err;
267 }
268 link->pdev = pdev;
269 link->cdns = platform_get_drvdata(pdev);
270
271 list_add_tail(&link->list, &ctx->link_list);
272 bus = &link->cdns->bus;
273 /* Calculate number of slaves */
274 list_for_each(node, &bus->slaves)
275 num_slaves++;
276 }
277
278 ctx->ids = devm_kcalloc(&adev->dev, num_slaves,
279 sizeof(*ctx->ids), GFP_KERNEL);
280 if (!ctx->ids)
281 goto err;
282
283 ctx->num_slaves = num_slaves;
284 i = 0;
285 list_for_each_entry(link, &ctx->link_list, list) {
286 bus = &link->cdns->bus;
287 list_for_each_entry(slave, &bus->slaves, node) {
288 ctx->ids[i].id = slave->id;
289 ctx->ids[i].link_id = bus->link_id;
290 i++;
291 }
292 }
293
294 return ctx;
295
296err:
297 ctx->count = i;
298 sdw_intel_cleanup(ctx);
299 return NULL;
300}
301
302static int
303sdw_intel_startup_controller(struct sdw_intel_ctx *ctx)
304{
305 struct acpi_device *adev;
306 struct sdw_intel_link_res *link;
307 u32 caps;
308 u32 link_mask;
309 int i;
310
311 if (acpi_bus_get_device(ctx->handle, &adev))
312 return -EINVAL;
313
314 /* Check SNDWLCAP.LCOUNT */
315 caps = ioread32(ctx->mmio_base + SDW_SHIM_BASE + SDW_SHIM_LCAP);
316 caps &= GENMASK(2, 0);
317
318 /* Check HW supported vs property value */
319 if (caps < ctx->count) {
320 dev_err(&adev->dev,
321 "BIOS master count is larger than hardware capabilities\n");
322 return -EINVAL;
323 }
324
325 if (!ctx->links)
326 return -EINVAL;
327
328 link = ctx->links;
329 link_mask = ctx->link_mask;
330
331 /* Startup SDW Master devices */
332 for (i = 0; i < ctx->count; i++, link++) {
333 if (!(link_mask & BIT(i)))
334 continue;
335
336 intel_master_startup(link->pdev);
337 }
338
339 return 0;
340}
341
342static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level,
343 void *cdata, void **return_value)
344{
345 struct sdw_intel_acpi_info *info = cdata;
346 struct acpi_device *adev;
347 acpi_status status;
348 u64 adr;
349
350 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
351 if (ACPI_FAILURE(status))
352 return AE_OK; /* keep going */
353
354 if (acpi_bus_get_device(handle, &adev)) {
355 pr_err("%s: Couldn't find ACPI handle\n", __func__);
356 return AE_NOT_FOUND;
357 }
358
359 info->handle = handle;
360
361 /*
362 * On some Intel platforms, multiple children of the HDAS
363 * device can be found, but only one of them is the SoundWire
364 * controller. The SNDW device is always exposed with
365 * Name(_ADR, 0x40000000), with bits 31..28 representing the
366 * SoundWire link so filter accordingly
367 */
368 if ((adr & GENMASK(31, 28)) >> 28 != SDW_LINK_TYPE)
369 return AE_OK; /* keep going */
370
371 /* device found, stop namespace walk */
372 return AE_CTRL_TERMINATE;
373}
374
375/**
376 * sdw_intel_acpi_scan() - SoundWire Intel init routine
377 * @parent_handle: ACPI parent handle
378 * @info: description of what firmware/DSDT tables expose
379 *
380 * This scans the namespace and queries firmware to figure out which
381 * links to enable. A follow-up use of sdw_intel_probe() and
382 * sdw_intel_startup() is required for creation of devices and bus
383 * startup
384 */
385int sdw_intel_acpi_scan(acpi_handle *parent_handle,
386 struct sdw_intel_acpi_info *info)
387{
388 acpi_status status;
389
390 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
391 parent_handle, 1,
392 sdw_intel_acpi_cb,
393 NULL, info, NULL);
394 if (ACPI_FAILURE(status))
395 return -ENODEV;
396
397 return sdw_intel_scan_controller(info);
398}
399EXPORT_SYMBOL_NS(sdw_intel_acpi_scan, SOUNDWIRE_INTEL_INIT);
400
401/**
402 * sdw_intel_probe() - SoundWire Intel probe routine
403 * @res: resource data
404 *
405 * This registers a platform device for each Master handled by the controller,
406 * and SoundWire Master and Slave devices will be created by the platform
407 * device probe. All the information necessary is stored in the context, and
408 * the res argument pointer can be freed after this step.
409 * This function will be called after sdw_intel_acpi_scan() by SOF probe.
410 */
411struct sdw_intel_ctx
412*sdw_intel_probe(struct sdw_intel_res *res)
413{
414 return sdw_intel_probe_controller(res);
415}
416EXPORT_SYMBOL_NS(sdw_intel_probe, SOUNDWIRE_INTEL_INIT);
417
418/**
419 * sdw_intel_startup() - SoundWire Intel startup
420 * @ctx: SoundWire context allocated in the probe
421 *
422 * Startup Intel SoundWire controller. This function will be called after
423 * Intel Audio DSP is powered up.
424 */
425int sdw_intel_startup(struct sdw_intel_ctx *ctx)
426{
427 return sdw_intel_startup_controller(ctx);
428}
429EXPORT_SYMBOL_NS(sdw_intel_startup, SOUNDWIRE_INTEL_INIT);
430/**
431 * sdw_intel_exit() - SoundWire Intel exit
432 * @ctx: SoundWire context allocated in the probe
433 *
434 * Delete the controller instances created and cleanup
435 */
436void sdw_intel_exit(struct sdw_intel_ctx *ctx)
437{
438 sdw_intel_cleanup(ctx);
439}
440EXPORT_SYMBOL_NS(sdw_intel_exit, SOUNDWIRE_INTEL_INIT);
441
442void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx)
443{
444 struct sdw_intel_link_res *link;
445 u32 link_mask;
446 int i;
447
448 if (!ctx->links)
449 return;
450
451 link = ctx->links;
452 link_mask = ctx->link_mask;
453
454 /* Startup SDW Master devices */
455 for (i = 0; i < ctx->count; i++, link++) {
456 if (!(link_mask & BIT(i)))
457 continue;
458
459 intel_master_process_wakeen_event(link->pdev);
460 }
461}
462EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, SOUNDWIRE_INTEL_INIT);
463
464MODULE_LICENSE("Dual BSD/GPL");
465MODULE_DESCRIPTION("Intel Soundwire Init Library");