xref: /openbmc/linux/sound/soc/amd/yc/pci-acp6x.c (revision bddcfb08)
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