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
19struct 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
26static 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
48static 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
72static void acp6x_enable_interrupts(void __iomem *acp_base)
73{
74	acp6x_writel(0x01, acp_base + ACP_EXTERNAL_INTR_ENB);
75}
76
77static 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
85static 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
107static 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
123static 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
144static 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;
266unregister_devs:
267	for (--index; index >= 0; index--)
268		platform_device_unregister(adata->pdev[index]);
269de_init:
270	if (acp6x_deinit(adata->acp6x_base))
271		dev_err(&pci->dev, "ACP de-init failed\n");
272release_regions:
273	pci_release_regions(pci);
274disable_pci:
275	pci_disable_device(pci);
276
277	return ret;
278}
279
280static 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
292static 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
304static 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
309static 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
328static 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};
334MODULE_DEVICE_TABLE(pci, snd_acp6x_ids);
335
336static 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
346module_pci_driver(yc_acp6x_driver);
347
348MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
349MODULE_DESCRIPTION("AMD ACP Yellow Carp PCI driver");
350MODULE_LICENSE("GPL v2");
351