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

   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
  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
  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
  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
  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
 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
 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
 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
 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");