1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * AMD RPL ACP PCI Driver
4 *
5 * Copyright 2022 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/pm_runtime.h>
14
15#include "rpl_acp6x.h"
16
17struct rpl_dev_data {
18	void __iomem *acp6x_base;
19};
20
21static int rpl_power_on(void __iomem *acp_base)
22{
23	u32 val;
24	int timeout;
25
26	val = rpl_acp_readl(acp_base + ACP_PGFSM_STATUS);
27
28	if (!val)
29		return val;
30
31	if ((val & ACP_PGFSM_STATUS_MASK) != ACP_POWER_ON_IN_PROGRESS)
32		rpl_acp_writel(ACP_PGFSM_CNTL_POWER_ON_MASK, acp_base + ACP_PGFSM_CONTROL);
33	timeout = 0;
34	while (++timeout < 500) {
35		val = rpl_acp_readl(acp_base + ACP_PGFSM_STATUS);
36		if (!val)
37			return 0;
38		udelay(1);
39	}
40	return -ETIMEDOUT;
41}
42
43static int rpl_reset(void __iomem *acp_base)
44{
45	u32 val;
46	int timeout;
47
48	rpl_acp_writel(1, acp_base + ACP_SOFT_RESET);
49	timeout = 0;
50	while (++timeout < 500) {
51		val = rpl_acp_readl(acp_base + ACP_SOFT_RESET);
52		if (val & ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK)
53			break;
54		cpu_relax();
55	}
56	rpl_acp_writel(0, acp_base + ACP_SOFT_RESET);
57	timeout = 0;
58	while (++timeout < 500) {
59		val = rpl_acp_readl(acp_base + ACP_SOFT_RESET);
60		if (!val)
61			return 0;
62		cpu_relax();
63	}
64	return -ETIMEDOUT;
65}
66
67static int rpl_init(void __iomem *acp_base)
68{
69	int ret;
70
71	/* power on */
72	ret = rpl_power_on(acp_base);
73	if (ret) {
74		pr_err("ACP power on failed\n");
75		return ret;
76	}
77	rpl_acp_writel(0x01, acp_base + ACP_CONTROL);
78	/* Reset */
79	ret = rpl_reset(acp_base);
80	if (ret) {
81		pr_err("ACP reset failed\n");
82		return ret;
83	}
84	rpl_acp_writel(0x03, acp_base + ACP_CLKMUX_SEL);
85	return 0;
86}
87
88static int rpl_deinit(void __iomem *acp_base)
89{
90	int ret;
91
92	/* Reset */
93	ret = rpl_reset(acp_base);
94	if (ret) {
95		pr_err("ACP reset failed\n");
96		return ret;
97	}
98	rpl_acp_writel(0x00, acp_base + ACP_CLKMUX_SEL);
99	rpl_acp_writel(0x00, acp_base + ACP_CONTROL);
100	return 0;
101}
102
103static int snd_rpl_probe(struct pci_dev *pci,
104			 const struct pci_device_id *pci_id)
105{
106	struct rpl_dev_data *adata;
107	u32 addr;
108	int ret;
109
110	/* RPL device check */
111	switch (pci->revision) {
112	case 0x62:
113		break;
114	default:
115		dev_dbg(&pci->dev, "acp6x pci device not found\n");
116		return -ENODEV;
117	}
118	if (pci_enable_device(pci)) {
119		dev_err(&pci->dev, "pci_enable_device failed\n");
120		return -ENODEV;
121	}
122
123	ret = pci_request_regions(pci, "AMD ACP6x audio");
124	if (ret < 0) {
125		dev_err(&pci->dev, "pci_request_regions failed\n");
126		goto disable_pci;
127	}
128
129	adata = devm_kzalloc(&pci->dev, sizeof(struct rpl_dev_data),
130			     GFP_KERNEL);
131	if (!adata) {
132		ret = -ENOMEM;
133		goto release_regions;
134	}
135
136	addr = pci_resource_start(pci, 0);
137	adata->acp6x_base = devm_ioremap(&pci->dev, addr,
138					 pci_resource_len(pci, 0));
139	if (!adata->acp6x_base) {
140		ret = -ENOMEM;
141		goto release_regions;
142	}
143	pci_set_master(pci);
144	pci_set_drvdata(pci, adata);
145	ret = rpl_init(adata->acp6x_base);
146	if (ret)
147		goto release_regions;
148	pm_runtime_set_autosuspend_delay(&pci->dev, ACP_SUSPEND_DELAY_MS);
149	pm_runtime_use_autosuspend(&pci->dev);
150	pm_runtime_put_noidle(&pci->dev);
151	pm_runtime_allow(&pci->dev);
152
153	return 0;
154release_regions:
155	pci_release_regions(pci);
156disable_pci:
157	pci_disable_device(pci);
158
159	return ret;
160}
161
162static int __maybe_unused snd_rpl_suspend(struct device *dev)
163{
164	struct rpl_dev_data *adata;
165	int ret;
166
167	adata = dev_get_drvdata(dev);
168	ret = rpl_deinit(adata->acp6x_base);
169	if (ret)
170		dev_err(dev, "ACP de-init failed\n");
171	return ret;
172}
173
174static int __maybe_unused snd_rpl_resume(struct device *dev)
175{
176	struct rpl_dev_data *adata;
177	int ret;
178
179	adata = dev_get_drvdata(dev);
180	ret = rpl_init(adata->acp6x_base);
181	if (ret)
182		dev_err(dev, "ACP init failed\n");
183	return ret;
184}
185
186static const struct dev_pm_ops rpl_pm = {
187	SET_RUNTIME_PM_OPS(snd_rpl_suspend, snd_rpl_resume, NULL)
188	SET_SYSTEM_SLEEP_PM_OPS(snd_rpl_suspend, snd_rpl_resume)
189};
190
191static void snd_rpl_remove(struct pci_dev *pci)
192{
193	struct rpl_dev_data *adata;
194	int ret;
195
196	adata = pci_get_drvdata(pci);
197	ret = rpl_deinit(adata->acp6x_base);
198	if (ret)
199		dev_err(&pci->dev, "ACP de-init failed\n");
200	pm_runtime_forbid(&pci->dev);
201	pm_runtime_get_noresume(&pci->dev);
202	pci_release_regions(pci);
203	pci_disable_device(pci);
204}
205
206static const struct pci_device_id snd_rpl_ids[] = {
207	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, ACP_DEVICE_ID),
208	.class = PCI_CLASS_MULTIMEDIA_OTHER << 8,
209	.class_mask = 0xffffff },
210	{ 0, },
211};
212MODULE_DEVICE_TABLE(pci, snd_rpl_ids);
213
214static struct pci_driver rpl_acp6x_driver  = {
215	.name = KBUILD_MODNAME,
216	.id_table = snd_rpl_ids,
217	.probe = snd_rpl_probe,
218	.remove = snd_rpl_remove,
219	.driver = {
220		.pm = &rpl_pm,
221	}
222};
223
224module_pci_driver(rpl_acp6x_driver);
225
226MODULE_DESCRIPTION("AMD ACP RPL PCI driver");
227MODULE_LICENSE("GPL v2");
228