sound/soc/amd/yc/pci-acp6x.c

   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
  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
  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
  72 static void acp6x_enable_interrupts(void __iomem *acp_base)
  73 {
  74         acp6x_writel(0x01, acp_base + ACP_EXTERNAL_INTR_ENB);
  75 }
  76
  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
  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
 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
 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
 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
 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
 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
 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");