1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // AMD ACP PCI Driver
4 //
5 //Copyright 2016 Advanced Micro Devices, Inc.
6
7 #include <linux/pci.h>
8 #include <linux/module.h>
9 #include <linux/io.h>
10 #include <linux/platform_device.h>
11 #include <linux/interrupt.h>
12 #include <linux/pm_runtime.h>
13 #include <linux/delay.h>
14
15 #include "acp3x.h"
16
17 struct acp3x_dev_data {
18 void __iomem *acp3x_base;
19 bool acp3x_audio_mode;
20 struct resource *res;
21 struct platform_device *pdev[ACP3x_DEVS];
22 u32 pme_en;
23 };
24
acp3x_power_on(struct acp3x_dev_data *adata)25 static int acp3x_power_on(struct acp3x_dev_data *adata)
26 {
27 void __iomem *acp3x_base = adata->acp3x_base;
28 u32 val;
29 int timeout;
30
31 val = rv_readl(acp3x_base + mmACP_PGFSM_STATUS);
32
33 if (val == 0)
34 return val;
35
36 if (!((val & ACP_PGFSM_STATUS_MASK) ==
37 ACP_POWER_ON_IN_PROGRESS))
38 rv_writel(ACP_PGFSM_CNTL_POWER_ON_MASK,
39 acp3x_base + mmACP_PGFSM_CONTROL);
40 timeout = 0;
41 while (++timeout < 500) {
42 val = rv_readl(acp3x_base + mmACP_PGFSM_STATUS);
43 if (!val) {
44 /* ACP power On clears PME_EN.
45 * Restore the value to its prior state
46 */
47 rv_writel(adata->pme_en, acp3x_base + mmACP_PME_EN);
48 return 0;
49 }
50 udelay(1);
51 }
52 return -ETIMEDOUT;
53 }
54
acp3x_reset(void __iomem *acp3x_base)55 static int acp3x_reset(void __iomem *acp3x_base)
56 {
57 u32 val;
58 int timeout;
59
60 rv_writel(1, acp3x_base + mmACP_SOFT_RESET);
61 timeout = 0;
62 while (++timeout < 500) {
63 val = rv_readl(acp3x_base + mmACP_SOFT_RESET);
64 if (val & ACP3x_SOFT_RESET__SoftResetAudDone_MASK)
65 break;
66 cpu_relax();
67 }
68 rv_writel(0, acp3x_base + mmACP_SOFT_RESET);
69 timeout = 0;
70 while (++timeout < 500) {
71 val = rv_readl(acp3x_base + mmACP_SOFT_RESET);
72 if (!val)
73 return 0;
74 cpu_relax();
75 }
76 return -ETIMEDOUT;
77 }
78
acp3x_enable_interrupts(void __iomem *acp_base)79 static void acp3x_enable_interrupts(void __iomem *acp_base)
80 {
81 rv_writel(0x01, acp_base + mmACP_EXTERNAL_INTR_ENB);
82 }
83
acp3x_disable_interrupts(void __iomem *acp_base)84 static void acp3x_disable_interrupts(void __iomem *acp_base)
85 {
86 rv_writel(ACP_EXT_INTR_STAT_CLEAR_MASK, acp_base +
87 mmACP_EXTERNAL_INTR_STAT);
88 rv_writel(0x00, acp_base + mmACP_EXTERNAL_INTR_CNTL);
89 rv_writel(0x00, acp_base + mmACP_EXTERNAL_INTR_ENB);
90 }
91
acp3x_init(struct acp3x_dev_data *adata)92 static int acp3x_init(struct acp3x_dev_data *adata)
93 {
94 void __iomem *acp3x_base = adata->acp3x_base;
95 int ret;
96
97 /* power on */
98 ret = acp3x_power_on(adata);
99 if (ret) {
100 pr_err("ACP3x power on failed\n");
101 return ret;
102 }
103 /* Reset */
104 ret = acp3x_reset(acp3x_base);
105 if (ret) {
106 pr_err("ACP3x reset failed\n");
107 return ret;
108 }
109 acp3x_enable_interrupts(acp3x_base);
110 return 0;
111 }
112
acp3x_deinit(void __iomem *acp3x_base)113 static int acp3x_deinit(void __iomem *acp3x_base)
114 {
115 int ret;
116
117 acp3x_disable_interrupts(acp3x_base);
118 /* Reset */
119 ret = acp3x_reset(acp3x_base);
120 if (ret) {
121 pr_err("ACP3x reset failed\n");
122 return ret;
123 }
124 return 0;
125 }
126
snd_acp3x_probe(struct pci_dev *pci, const struct pci_device_id *pci_id)127 static int snd_acp3x_probe(struct pci_dev *pci,
128 const struct pci_device_id *pci_id)
129 {
130 struct acp3x_dev_data *adata;
131 struct platform_device_info pdevinfo[ACP3x_DEVS];
132 unsigned int irqflags;
133 int ret, i;
134 u32 addr, val;
135
136 /* Raven device detection */
137 if (pci->revision != 0x00)
138 return -ENODEV;
139
140 if (pci_enable_device(pci)) {
141 dev_err(&pci->dev, "pci_enable_device failed\n");
142 return -ENODEV;
143 }
144
145 ret = pci_request_regions(pci, "AMD ACP3x audio");
146 if (ret < 0) {
147 dev_err(&pci->dev, "pci_request_regions failed\n");
148 goto disable_pci;
149 }
150
151 adata = devm_kzalloc(&pci->dev, sizeof(struct acp3x_dev_data),
152 GFP_KERNEL);
153 if (!adata) {
154 ret = -ENOMEM;
155 goto release_regions;
156 }
157
158 /* check for msi interrupt support */
159 ret = pci_enable_msi(pci);
160 if (ret)
161 /* msi is not enabled */
162 irqflags = IRQF_SHARED;
163 else
164 /* msi is enabled */
165 irqflags = 0;
166
167 addr = pci_resource_start(pci, 0);
168 adata->acp3x_base = devm_ioremap(&pci->dev, addr,
169 pci_resource_len(pci, 0));
170 if (!adata->acp3x_base) {
171 ret = -ENOMEM;
172 goto disable_msi;
173 }
174 pci_set_master(pci);
175 pci_set_drvdata(pci, adata);
176 /* Save ACP_PME_EN state */
177 adata->pme_en = rv_readl(adata->acp3x_base + mmACP_PME_EN);
178 ret = acp3x_init(adata);
179 if (ret)
180 goto disable_msi;
181
182 val = rv_readl(adata->acp3x_base + mmACP_I2S_PIN_CONFIG);
183 switch (val) {
184 case I2S_MODE:
185 adata->res = devm_kzalloc(&pci->dev,
186 sizeof(struct resource) * 4,
187 GFP_KERNEL);
188 if (!adata->res) {
189 ret = -ENOMEM;
190 goto de_init;
191 }
192
193 adata->res[0].name = "acp3x_i2s_iomem";
194 adata->res[0].flags = IORESOURCE_MEM;
195 adata->res[0].start = addr;
196 adata->res[0].end = addr + (ACP3x_REG_END - ACP3x_REG_START);
197
198 adata->res[1].name = "acp3x_i2s_sp";
199 adata->res[1].flags = IORESOURCE_MEM;
200 adata->res[1].start = addr + ACP3x_I2STDM_REG_START;
201 adata->res[1].end = addr + ACP3x_I2STDM_REG_END;
202
203 adata->res[2].name = "acp3x_i2s_bt";
204 adata->res[2].flags = IORESOURCE_MEM;
205 adata->res[2].start = addr + ACP3x_BT_TDM_REG_START;
206 adata->res[2].end = addr + ACP3x_BT_TDM_REG_END;
207
208 adata->res[3].name = "acp3x_i2s_irq";
209 adata->res[3].flags = IORESOURCE_IRQ;
210 adata->res[3].start = pci->irq;
211 adata->res[3].end = adata->res[3].start;
212
213 adata->acp3x_audio_mode = ACP3x_I2S_MODE;
214
215 memset(&pdevinfo, 0, sizeof(pdevinfo));
216 pdevinfo[0].name = "acp3x_rv_i2s_dma";
217 pdevinfo[0].id = 0;
218 pdevinfo[0].parent = &pci->dev;
219 pdevinfo[0].num_res = 4;
220 pdevinfo[0].res = &adata->res[0];
221 pdevinfo[0].data = &irqflags;
222 pdevinfo[0].size_data = sizeof(irqflags);
223
224 pdevinfo[1].name = "acp3x_i2s_playcap";
225 pdevinfo[1].id = 0;
226 pdevinfo[1].parent = &pci->dev;
227 pdevinfo[1].num_res = 1;
228 pdevinfo[1].res = &adata->res[1];
229
230 pdevinfo[2].name = "acp3x_i2s_playcap";
231 pdevinfo[2].id = 1;
232 pdevinfo[2].parent = &pci->dev;
233 pdevinfo[2].num_res = 1;
234 pdevinfo[2].res = &adata->res[1];
235
236 pdevinfo[3].name = "acp3x_i2s_playcap";
237 pdevinfo[3].id = 2;
238 pdevinfo[3].parent = &pci->dev;
239 pdevinfo[3].num_res = 1;
240 pdevinfo[3].res = &adata->res[2];
241 for (i = 0; i < ACP3x_DEVS; i++) {
242 adata->pdev[i] =
243 platform_device_register_full(&pdevinfo[i]);
244 if (IS_ERR(adata->pdev[i])) {
245 dev_err(&pci->dev, "cannot register %s device\n",
246 pdevinfo[i].name);
247 ret = PTR_ERR(adata->pdev[i]);
248 goto unregister_devs;
249 }
250 }
251 break;
252 default:
253 dev_err(&pci->dev, "Invalid ACP audio mode : %d\n", val);
254 ret = -ENODEV;
255 goto disable_msi;
256 }
257 pm_runtime_set_autosuspend_delay(&pci->dev, 2000);
258 pm_runtime_use_autosuspend(&pci->dev);
259 pm_runtime_put_noidle(&pci->dev);
260 pm_runtime_allow(&pci->dev);
261 return 0;
262
263 unregister_devs:
264 if (val == I2S_MODE)
265 for (i = 0; i < ACP3x_DEVS; i++)
266 platform_device_unregister(adata->pdev[i]);
267 de_init:
268 if (acp3x_deinit(adata->acp3x_base))
269 dev_err(&pci->dev, "ACP de-init failed\n");
270 disable_msi:
271 pci_disable_msi(pci);
272 release_regions:
273 pci_release_regions(pci);
274 disable_pci:
275 pci_disable_device(pci);
276
277 return ret;
278 }
279
snd_acp3x_suspend(struct device *dev)280 static int snd_acp3x_suspend(struct device *dev)
281 {
282 int ret;
283 struct acp3x_dev_data *adata;
284
285 adata = dev_get_drvdata(dev);
286 ret = acp3x_deinit(adata->acp3x_base);
287 if (ret)
288 dev_err(dev, "ACP de-init failed\n");
289 else
290 dev_dbg(dev, "ACP de-initialized\n");
291
292 return 0;
293 }
294
snd_acp3x_resume(struct device *dev)295 static int snd_acp3x_resume(struct device *dev)
296 {
297 int ret;
298 struct acp3x_dev_data *adata;
299
300 adata = dev_get_drvdata(dev);
301 ret = acp3x_init(adata);
302 if (ret) {
303 dev_err(dev, "ACP init failed\n");
304 return ret;
305 }
306 return 0;
307 }
308
309 static const struct dev_pm_ops acp3x_pm = {
310 .runtime_suspend = snd_acp3x_suspend,
311 .runtime_resume = snd_acp3x_resume,
312 .resume = snd_acp3x_resume,
313 };
314
snd_acp3x_remove(struct pci_dev *pci)315 static void snd_acp3x_remove(struct pci_dev *pci)
316 {
317 struct acp3x_dev_data *adata;
318 int i, ret;
319
320 adata = pci_get_drvdata(pci);
321 if (adata->acp3x_audio_mode == ACP3x_I2S_MODE) {
322 for (i = 0; i < ACP3x_DEVS; i++)
323 platform_device_unregister(adata->pdev[i]);
324 }
325 ret = acp3x_deinit(adata->acp3x_base);
326 if (ret)
327 dev_err(&pci->dev, "ACP de-init failed\n");
328 pm_runtime_forbid(&pci->dev);
329 pm_runtime_get_noresume(&pci->dev);
330 pci_disable_msi(pci);
331 pci_release_regions(pci);
332 pci_disable_device(pci);
333 }
334
335 static const struct pci_device_id snd_acp3x_ids[] = {
336 { PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x15e2),
337 .class = PCI_CLASS_MULTIMEDIA_OTHER << 8,
338 .class_mask = 0xffffff },
339 { 0, },
340 };
341 MODULE_DEVICE_TABLE(pci, snd_acp3x_ids);
342
343 static struct pci_driver acp3x_driver = {
344 .name = KBUILD_MODNAME,
345 .id_table = snd_acp3x_ids,
346 .probe = snd_acp3x_probe,
347 .remove = snd_acp3x_remove,
348 .driver = {
349 .pm = &acp3x_pm,
350 }
351 };
352
353 module_pci_driver(acp3x_driver);
354
355 MODULE_AUTHOR("Vishnuvardhanrao.Ravulapati@amd.com");
356 MODULE_AUTHOR("Maruthi.Bayyavarapu@amd.com");
357 MODULE_DESCRIPTION("AMD ACP3x PCI driver");
358 MODULE_LICENSE("GPL v2");
359