1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * AMD Yellow Carp ACP PCI Driver
4 *
5 * Copyright 2021 Advanced Micro Devices, Inc.
6 */
7
8 #include <linux/pci.h>
9 #include <linux/module.h>
10 #include <linux/io.h>
11 #include <linux/delay.h>
12 #include <linux/platform_device.h>
13 #include <linux/interrupt.h>
14 #include <sound/pcm_params.h>
15 #include <linux/pm_runtime.h>
16
17 #include "acp6x.h"
18
19 struct acp6x_dev_data {
20 void __iomem *acp6x_base;
21 struct resource *res;
22 bool acp6x_audio_mode;
23 struct platform_device *pdev[ACP6x_DEVS];
24 };
25
acp6x_power_on(void __iomem * acp_base)26 static int acp6x_power_on(void __iomem *acp_base)
27 {
28 u32 val;
29 int timeout;
30
31 val = acp6x_readl(acp_base + ACP_PGFSM_STATUS);
32
33 if (!val)
34 return val;
35
36 if ((val & ACP_PGFSM_STATUS_MASK) != ACP_POWER_ON_IN_PROGRESS)
37 acp6x_writel(ACP_PGFSM_CNTL_POWER_ON_MASK, acp_base + ACP_PGFSM_CONTROL);
38 timeout = 0;
39 while (++timeout < 500) {
40 val = acp6x_readl(acp_base + ACP_PGFSM_STATUS);
41 if (!val)
42 return 0;
43 udelay(1);
44 }
45 return -ETIMEDOUT;
46 }
47
acp6x_reset(void __iomem * acp_base)48 static int acp6x_reset(void __iomem *acp_base)
49 {
50 u32 val;
51 int timeout;
52
53 acp6x_writel(1, acp_base + ACP_SOFT_RESET);
54 timeout = 0;
55 while (++timeout < 500) {
56 val = acp6x_readl(acp_base + ACP_SOFT_RESET);
57 if (val & ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK)
58 break;
59 cpu_relax();
60 }
61 acp6x_writel(0, acp_base + ACP_SOFT_RESET);
62 timeout = 0;
63 while (++timeout < 500) {
64 val = acp6x_readl(acp_base + ACP_SOFT_RESET);
65 if (!val)
66 return 0;
67 cpu_relax();
68 }
69 return -ETIMEDOUT;
70 }
71
acp6x_enable_interrupts(void __iomem * acp_base)72 static void acp6x_enable_interrupts(void __iomem *acp_base)
73 {
74 acp6x_writel(0x01, acp_base + ACP_EXTERNAL_INTR_ENB);
75 }
76
acp6x_disable_interrupts(void __iomem * acp_base)77 static void acp6x_disable_interrupts(void __iomem *acp_base)
78 {
79 acp6x_writel(ACP_EXT_INTR_STAT_CLEAR_MASK, acp_base +
80 ACP_EXTERNAL_INTR_STAT);
81 acp6x_writel(0x00, acp_base + ACP_EXTERNAL_INTR_CNTL);
82 acp6x_writel(0x00, acp_base + ACP_EXTERNAL_INTR_ENB);
83 }
84
acp6x_init(void __iomem * acp_base)85 static int acp6x_init(void __iomem *acp_base)
86 {
87 int ret;
88
89 /* power on */
90 ret = acp6x_power_on(acp_base);
91 if (ret) {
92 pr_err("ACP power on failed\n");
93 return ret;
94 }
95 acp6x_writel(0x01, acp_base + ACP_CONTROL);
96 /* Reset */
97 ret = acp6x_reset(acp_base);
98 if (ret) {
99 pr_err("ACP reset failed\n");
100 return ret;
101 }
102 acp6x_writel(0x03, acp_base + ACP_CLKMUX_SEL);
103 acp6x_enable_interrupts(acp_base);
104 return 0;
105 }
106
acp6x_deinit(void __iomem * acp_base)107 static int acp6x_deinit(void __iomem *acp_base)
108 {
109 int ret;
110
111 acp6x_disable_interrupts(acp_base);
112 /* Reset */
113 ret = acp6x_reset(acp_base);
114 if (ret) {
115 pr_err("ACP reset failed\n");
116 return ret;
117 }
118 acp6x_writel(0x00, acp_base + ACP_CLKMUX_SEL);
119 acp6x_writel(0x00, acp_base + ACP_CONTROL);
120 return 0;
121 }
122
acp6x_irq_handler(int irq,void * dev_id)123 static irqreturn_t acp6x_irq_handler(int irq, void *dev_id)
124 {
125 struct acp6x_dev_data *adata;
126 struct pdm_dev_data *yc_pdm_data;
127 u32 val;
128
129 adata = dev_id;
130 if (!adata)
131 return IRQ_NONE;
132
133 val = acp6x_readl(adata->acp6x_base + ACP_EXTERNAL_INTR_STAT);
134 if (val & BIT(PDM_DMA_STAT)) {
135 yc_pdm_data = dev_get_drvdata(&adata->pdev[0]->dev);
136 acp6x_writel(BIT(PDM_DMA_STAT), adata->acp6x_base + ACP_EXTERNAL_INTR_STAT);
137 if (yc_pdm_data->capture_stream)
138 snd_pcm_period_elapsed(yc_pdm_data->capture_stream);
139 return IRQ_HANDLED;
140 }
141 return IRQ_NONE;
142 }
143
snd_acp6x_probe(struct pci_dev * pci,const struct pci_device_id * pci_id)144 static int snd_acp6x_probe(struct pci_dev *pci,
145 const struct pci_device_id *pci_id)
146 {
147 struct acp6x_dev_data *adata;
148 struct platform_device_info pdevinfo[ACP6x_DEVS];
149 int index = 0;
150 int val = 0x00;
151 u32 addr;
152 unsigned int irqflags, flag;
153 int ret;
154
155 irqflags = IRQF_SHARED;
156
157 /* Return if acp config flag is defined */
158 flag = snd_amd_acp_find_config(pci);
159 if (flag)
160 return -ENODEV;
161
162 /* Yellow Carp device check */
163 switch (pci->revision) {
164 case 0x60:
165 case 0x6f:
166 break;
167 default:
168 dev_dbg(&pci->dev, "acp6x pci device not found\n");
169 return -ENODEV;
170 }
171 if (pci_enable_device(pci)) {
172 dev_err(&pci->dev, "pci_enable_device failed\n");
173 return -ENODEV;
174 }
175
176 ret = pci_request_regions(pci, "AMD ACP3x audio");
177 if (ret < 0) {
178 dev_err(&pci->dev, "pci_request_regions failed\n");
179 goto disable_pci;
180 }
181
182 adata = devm_kzalloc(&pci->dev, sizeof(struct acp6x_dev_data),
183 GFP_KERNEL);
184 if (!adata) {
185 ret = -ENOMEM;
186 goto release_regions;
187 }
188
189 addr = pci_resource_start(pci, 0);
190 adata->acp6x_base = devm_ioremap(&pci->dev, addr,
191 pci_resource_len(pci, 0));
192 if (!adata->acp6x_base) {
193 ret = -ENOMEM;
194 goto release_regions;
195 }
196 pci_set_master(pci);
197 pci_set_drvdata(pci, adata);
198 ret = acp6x_init(adata->acp6x_base);
199 if (ret)
200 goto release_regions;
201 val = acp6x_readl(adata->acp6x_base + ACP_PIN_CONFIG);
202 switch (val) {
203 case ACP_CONFIG_0:
204 case ACP_CONFIG_1:
205 case ACP_CONFIG_2:
206 case ACP_CONFIG_3:
207 case ACP_CONFIG_9:
208 case ACP_CONFIG_15:
209 dev_info(&pci->dev, "Audio Mode %d\n", val);
210 break;
211 default:
212 adata->res = devm_kzalloc(&pci->dev,
213 sizeof(struct resource),
214 GFP_KERNEL);
215 if (!adata->res) {
216 ret = -ENOMEM;
217 goto de_init;
218 }
219
220 adata->res->name = "acp_iomem";
221 adata->res->flags = IORESOURCE_MEM;
222 adata->res->start = addr;
223 adata->res->end = addr + (ACP6x_REG_END - ACP6x_REG_START);
224
225 adata->acp6x_audio_mode = ACP6x_PDM_MODE;
226
227 memset(&pdevinfo, 0, sizeof(pdevinfo));
228 pdevinfo[0].name = "acp_yc_pdm_dma";
229 pdevinfo[0].id = 0;
230 pdevinfo[0].parent = &pci->dev;
231 pdevinfo[0].num_res = 1;
232 pdevinfo[0].res = adata->res;
233
234 pdevinfo[1].name = "dmic-codec";
235 pdevinfo[1].id = 0;
236 pdevinfo[1].parent = &pci->dev;
237
238 pdevinfo[2].name = "acp_yc_mach";
239 pdevinfo[2].id = 0;
240 pdevinfo[2].parent = &pci->dev;
241
242 for (index = 0; index < ACP6x_DEVS; index++) {
243 adata->pdev[index] =
244 platform_device_register_full(&pdevinfo[index]);
245 if (IS_ERR(adata->pdev[index])) {
246 dev_err(&pci->dev, "cannot register %s device\n",
247 pdevinfo[index].name);
248 ret = PTR_ERR(adata->pdev[index]);
249 goto unregister_devs;
250 }
251 }
252 break;
253 }
254 ret = devm_request_irq(&pci->dev, pci->irq, acp6x_irq_handler,
255 irqflags, "ACP_PCI_IRQ", adata);
256 if (ret) {
257 dev_err(&pci->dev, "ACP PCI IRQ request failed\n");
258 goto unregister_devs;
259 }
260 pm_runtime_set_autosuspend_delay(&pci->dev, ACP_SUSPEND_DELAY_MS);
261 pm_runtime_use_autosuspend(&pci->dev);
262 pm_runtime_put_noidle(&pci->dev);
263 pm_runtime_allow(&pci->dev);
264
265 return 0;
266 unregister_devs:
267 for (--index; index >= 0; index--)
268 platform_device_unregister(adata->pdev[index]);
269 de_init:
270 if (acp6x_deinit(adata->acp6x_base))
271 dev_err(&pci->dev, "ACP de-init failed\n");
272 release_regions:
273 pci_release_regions(pci);
274 disable_pci:
275 pci_disable_device(pci);
276
277 return ret;
278 }
279
snd_acp6x_suspend(struct device * dev)280 static int __maybe_unused snd_acp6x_suspend(struct device *dev)
281 {
282 struct acp6x_dev_data *adata;
283 int ret;
284
285 adata = dev_get_drvdata(dev);
286 ret = acp6x_deinit(adata->acp6x_base);
287 if (ret)
288 dev_err(dev, "ACP de-init failed\n");
289 return ret;
290 }
291
snd_acp6x_resume(struct device * dev)292 static int __maybe_unused snd_acp6x_resume(struct device *dev)
293 {
294 struct acp6x_dev_data *adata;
295 int ret;
296
297 adata = dev_get_drvdata(dev);
298 ret = acp6x_init(adata->acp6x_base);
299 if (ret)
300 dev_err(dev, "ACP init failed\n");
301 return ret;
302 }
303
304 static const struct dev_pm_ops acp6x_pm = {
305 SET_RUNTIME_PM_OPS(snd_acp6x_suspend, snd_acp6x_resume, NULL)
306 SET_SYSTEM_SLEEP_PM_OPS(snd_acp6x_suspend, snd_acp6x_resume)
307 };
308
snd_acp6x_remove(struct pci_dev * pci)309 static void snd_acp6x_remove(struct pci_dev *pci)
310 {
311 struct acp6x_dev_data *adata;
312 int ret, index;
313
314 adata = pci_get_drvdata(pci);
315 if (adata->acp6x_audio_mode == ACP6x_PDM_MODE) {
316 for (index = 0; index < ACP6x_DEVS; index++)
317 platform_device_unregister(adata->pdev[index]);
318 }
319 ret = acp6x_deinit(adata->acp6x_base);
320 if (ret)
321 dev_err(&pci->dev, "ACP de-init failed\n");
322 pm_runtime_forbid(&pci->dev);
323 pm_runtime_get_noresume(&pci->dev);
324 pci_release_regions(pci);
325 pci_disable_device(pci);
326 }
327
328 static const struct pci_device_id snd_acp6x_ids[] = {
329 { PCI_DEVICE(PCI_VENDOR_ID_AMD, ACP_DEVICE_ID),
330 .class = PCI_CLASS_MULTIMEDIA_OTHER << 8,
331 .class_mask = 0xffffff },
332 { 0, },
333 };
334 MODULE_DEVICE_TABLE(pci, snd_acp6x_ids);
335
336 static struct pci_driver yc_acp6x_driver = {
337 .name = KBUILD_MODNAME,
338 .id_table = snd_acp6x_ids,
339 .probe = snd_acp6x_probe,
340 .remove = snd_acp6x_remove,
341 .driver = {
342 .pm = &acp6x_pm,
343 }
344 };
345
346 module_pci_driver(yc_acp6x_driver);
347
348 MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
349 MODULE_DESCRIPTION("AMD ACP Yellow Carp PCI driver");
350 MODULE_LICENSE("GPL v2");
351