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 ret, index;
 150         int val = 0x00;
 151         u32 addr;
 152         unsigned int irqflags;
 153
 154         irqflags = IRQF_SHARED;
 155         /* Yellow Carp device check */
 156         if (pci->revision != 0x60)
 157                 return -ENODEV;
 158
 159         if (pci_enable_device(pci)) {
 160                 dev_err(&pci->dev, "pci_enable_device failed\n");
 161                 return -ENODEV;
 162         }
 163
 164         ret = pci_request_regions(pci, "AMD ACP3x audio");
 165         if (ret < 0) {
 166                 dev_err(&pci->dev, "pci_request_regions failed\n");
 167                 goto disable_pci;
 168         }
 169
 170         adata = devm_kzalloc(&pci->dev, sizeof(struct acp6x_dev_data),
 171                              GFP_KERNEL);
 172         if (!adata) {
 173                 ret = -ENOMEM;
 174                 goto release_regions;
 175         }
 176
 177         addr = pci_resource_start(pci, 0);
 178         adata->acp6x_base = devm_ioremap(&pci->dev, addr,
 179                                          pci_resource_len(pci, 0));
 180         if (!adata->acp6x_base) {
 181                 ret = -ENOMEM;
 182                 goto release_regions;
 183         }
 184         pci_set_master(pci);
 185         pci_set_drvdata(pci, adata);
 186         ret = acp6x_init(adata->acp6x_base);
 187         if (ret)
 188                 goto release_regions;
 189         val = acp6x_readl(adata->acp6x_base + ACP_PIN_CONFIG);
 190         switch (val) {
 191         case ACP_CONFIG_0:
 192         case ACP_CONFIG_1:
 193         case ACP_CONFIG_2:
 194         case ACP_CONFIG_3:
 195         case ACP_CONFIG_9:
 196         case ACP_CONFIG_15:
 197                 dev_info(&pci->dev, "Audio Mode %d\n", val);
 198                 break;
 199         default:
 200                 adata->res = devm_kzalloc(&pci->dev,
 201                                           sizeof(struct resource),
 202                                           GFP_KERNEL);
 203                 if (!adata->res) {
 204                         ret = -ENOMEM;
 205                         goto de_init;
 206                 }
 207
 208                 adata->res->name = "acp_iomem";
 209                 adata->res->flags = IORESOURCE_MEM;
 210                 adata->res->start = addr;
 211                 adata->res->end = addr + (ACP6x_REG_END - ACP6x_REG_START);
 212
 213                 adata->acp6x_audio_mode = ACP6x_PDM_MODE;
 214
 215                 memset(&pdevinfo, 0, sizeof(pdevinfo));
 216                 pdevinfo[0].name = "acp_yc_pdm_dma";
 217                 pdevinfo[0].id = 0;
 218                 pdevinfo[0].parent = &pci->dev;
 219                 pdevinfo[0].num_res = 1;
 220                 pdevinfo[0].res = adata->res;
 221
 222                 pdevinfo[1].name = "dmic-codec";
 223                 pdevinfo[1].id = 0;
 224                 pdevinfo[1].parent = &pci->dev;
 225
 226                 pdevinfo[2].name = "acp_yc_mach";
 227                 pdevinfo[2].id = 0;
 228                 pdevinfo[2].parent = &pci->dev;
 229
 230                 for (index = 0; index < ACP6x_DEVS; index++) {
 231                         adata->pdev[index] =
 232                                 platform_device_register_full(&pdevinfo[index]);
 233                         if (IS_ERR(adata->pdev[index])) {
 234                                 dev_err(&pci->dev, "cannot register %s device\n",
 235                                         pdevinfo[index].name);
 236                                 ret = PTR_ERR(adata->pdev[index]);
 237                                 goto unregister_devs;
 238                         }
 239                 }
 240                 break;
 241         }
 242         ret = devm_request_irq(&pci->dev, pci->irq, acp6x_irq_handler,
 243                                irqflags, "ACP_PCI_IRQ", adata);
 244         if (ret) {
 245                 dev_err(&pci->dev, "ACP PCI IRQ request failed\n");
 246                 goto unregister_devs;
 247         }
 248         pm_runtime_set_autosuspend_delay(&pci->dev, ACP_SUSPEND_DELAY_MS);
 249         pm_runtime_use_autosuspend(&pci->dev);
 250         pm_runtime_put_noidle(&pci->dev);
 251         pm_runtime_allow(&pci->dev);
 252
 253         return 0;
 254 unregister_devs:
 255         for (--index; index >= 0; index--)
 256                 platform_device_unregister(adata->pdev[index]);
 257 de_init:
 258         if (acp6x_deinit(adata->acp6x_base))
 259                 dev_err(&pci->dev, "ACP de-init failed\n");
 260 release_regions:
 261         pci_release_regions(pci);
 262 disable_pci:
 263         pci_disable_device(pci);
 264
 265         return ret;
 266 }
 267
 268 static int __maybe_unused snd_acp6x_suspend(struct device *dev)
 269 {
 270         struct acp6x_dev_data *adata;
 271         int ret;
 272
 273         adata = dev_get_drvdata(dev);
 274         ret = acp6x_deinit(adata->acp6x_base);
 275         if (ret)
 276                 dev_err(dev, "ACP de-init failed\n");
 277         return ret;
 278 }
 279
 280 static int __maybe_unused snd_acp6x_resume(struct device *dev)
 281 {
 282         struct acp6x_dev_data *adata;
 283         int ret;
 284
 285         adata = dev_get_drvdata(dev);
 286         ret = acp6x_init(adata->acp6x_base);
 287         if (ret)
 288                 dev_err(dev, "ACP init failed\n");
 289         return ret;
 290 }
 291
 292 static const struct dev_pm_ops acp6x_pm = {
 293         SET_RUNTIME_PM_OPS(snd_acp6x_suspend, snd_acp6x_resume, NULL)
 294         SET_SYSTEM_SLEEP_PM_OPS(snd_acp6x_suspend, snd_acp6x_resume)
 295 };
 296
 297 static void snd_acp6x_remove(struct pci_dev *pci)
 298 {
 299         struct acp6x_dev_data *adata;
 300         int ret, index;
 301
 302         adata = pci_get_drvdata(pci);
 303         if (adata->acp6x_audio_mode == ACP6x_PDM_MODE) {
 304                 for (index = 0; index < ACP6x_DEVS; index++)
 305                         platform_device_unregister(adata->pdev[index]);
 306         }
 307         ret = acp6x_deinit(adata->acp6x_base);
 308         if (ret)
 309                 dev_err(&pci->dev, "ACP de-init failed\n");
 310         pm_runtime_forbid(&pci->dev);
 311         pm_runtime_get_noresume(&pci->dev);
 312         pci_release_regions(pci);
 313         pci_disable_device(pci);
 314 }
 315
 316 static const struct pci_device_id snd_acp6x_ids[] = {
 317         { PCI_DEVICE(PCI_VENDOR_ID_AMD, ACP_DEVICE_ID),
 318         .class = PCI_CLASS_MULTIMEDIA_OTHER << 8,
 319         .class_mask = 0xffffff },
 320         { 0, },
 321 };
 322 MODULE_DEVICE_TABLE(pci, snd_acp6x_ids);
 323
 324 static struct pci_driver yc_acp6x_driver  = {
 325         .name = KBUILD_MODNAME,
 326         .id_table = snd_acp6x_ids,
 327         .probe = snd_acp6x_probe,
 328         .remove = snd_acp6x_remove,
 329         .driver = {
 330                 .pm = &acp6x_pm,
 331         }
 332 };
 333
 334 module_pci_driver(yc_acp6x_driver);
 335
 336 MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
 337 MODULE_DESCRIPTION("AMD ACP Yellow Carp PCI driver");
 338 MODULE_LICENSE("GPL v2");