xref: /openbmc/linux/sound/soc/amd/yc/pci-acp6x.c (revision 1ac731c529cd4d6adbce134754b51ff7d822b145)
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