xref: /openbmc/linux/sound/soc/amd/rpl/rpl-pci-acp6x.c (revision bc1100f2)
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 
17 struct rpl_dev_data {
18 	void __iomem *acp6x_base;
19 };
20 
rpl_power_on(void __iomem * acp_base)21 static 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 
rpl_reset(void __iomem * acp_base)43 static 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 
rpl_init(void __iomem * acp_base)67 static 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 
rpl_deinit(void __iomem * acp_base)88 static 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 
snd_rpl_probe(struct pci_dev * pci,const struct pci_device_id * pci_id)103 static 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;
154 release_regions:
155 	pci_release_regions(pci);
156 disable_pci:
157 	pci_disable_device(pci);
158 
159 	return ret;
160 }
161 
snd_rpl_suspend(struct device * dev)162 static 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 
snd_rpl_resume(struct device * dev)174 static 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 
186 static 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 
snd_rpl_remove(struct pci_dev * pci)191 static 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 
206 static 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 };
212 MODULE_DEVICE_TABLE(pci, snd_rpl_ids);
213 
214 static 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 
224 module_pci_driver(rpl_acp6x_driver);
225 
226 MODULE_DESCRIPTION("AMD ACP RPL PCI driver");
227 MODULE_LICENSE("GPL v2");
228