drivers/crypto/ccp/sp-platform.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * AMD Secure Processor device driver
   4  *
   5  * Copyright (C) 2014,2018 Advanced Micro Devices, Inc.
   6  *
   7  * Author: Tom Lendacky <[email protected]>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/device.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/ioport.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/kthread.h>
  17 #include <linux/sched.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/delay.h>
  21 #include <linux/ccp.h>
  22 #include <linux/of.h>
  23 #include <linux/of_address.h>
  24 #include <linux/acpi.h>
  25
  26 #include "ccp-dev.h"
  27
  28 struct sp_platform {
  29         int coherent;
  30         unsigned int irq_count;
  31 };
  32
  33 static const struct sp_dev_vdata dev_vdata[] = {
  34         {
  35                 .bar = 0,
  36 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
  37                 .ccp_vdata = &ccpv3_platform,
  38 #endif
  39         },
  40 };
  41
  42 #ifdef CONFIG_ACPI
  43 static const struct acpi_device_id sp_acpi_match[] = {
  44         { "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
  45         { },
  46 };
  47 MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
  48 #endif
  49
  50 #ifdef CONFIG_OF
  51 static const struct of_device_id sp_of_match[] = {
  52         { .compatible = "amd,ccp-seattle-v1a",
  53           .data = (const void *)&dev_vdata[0] },
  54         { },
  55 };
  56 MODULE_DEVICE_TABLE(of, sp_of_match);
  57 #endif
  58
  59 static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev)
  60 {
  61 #ifdef CONFIG_OF
  62         const struct of_device_id *match;
  63
  64         match = of_match_node(sp_of_match, pdev->dev.of_node);
  65         if (match && match->data)
  66                 return (struct sp_dev_vdata *)match->data;
  67 #endif
  68         return NULL;
  69 }
  70
  71 static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev)
  72 {
  73 #ifdef CONFIG_ACPI
  74         const struct acpi_device_id *match;
  75
  76         match = acpi_match_device(sp_acpi_match, &pdev->dev);
  77         if (match && match->driver_data)
  78                 return (struct sp_dev_vdata *)match->driver_data;
  79 #endif
  80         return NULL;
  81 }
  82
  83 static int sp_get_irqs(struct sp_device *sp)
  84 {
  85         struct sp_platform *sp_platform = sp->dev_specific;
  86         struct device *dev = sp->dev;
  87         struct platform_device *pdev = to_platform_device(dev);
  88         unsigned int i, count;
  89         int ret;
  90
  91         for (i = 0, count = 0; i < pdev->num_resources; i++) {
  92                 struct resource *res = &pdev->resource[i];
  93
  94                 if (resource_type(res) == IORESOURCE_IRQ)
  95                         count++;
  96         }
  97
  98         sp_platform->irq_count = count;
  99
 100         ret = platform_get_irq(pdev, 0);
 101         if (ret < 0) {
 102                 dev_notice(dev, "unable to get IRQ (%d)\n", ret);
 103                 return ret;
 104         }
 105
 106         sp->psp_irq = ret;
 107         if (count == 1) {
 108                 sp->ccp_irq = ret;
 109         } else {
 110                 ret = platform_get_irq(pdev, 1);
 111                 if (ret < 0) {
 112                         dev_notice(dev, "unable to get IRQ (%d)\n", ret);
 113                         return ret;
 114                 }
 115
 116                 sp->ccp_irq = ret;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static int sp_platform_probe(struct platform_device *pdev)
 123 {
 124         struct sp_device *sp;
 125         struct sp_platform *sp_platform;
 126         struct device *dev = &pdev->dev;
 127         enum dev_dma_attr attr;
 128         int ret;
 129
 130         ret = -ENOMEM;
 131         sp = sp_alloc_struct(dev);
 132         if (!sp)
 133                 goto e_err;
 134
 135         sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL);
 136         if (!sp_platform)
 137                 goto e_err;
 138
 139         sp->dev_specific = sp_platform;
 140         sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev)
 141                                          : sp_get_acpi_version(pdev);
 142         if (!sp->dev_vdata) {
 143                 ret = -ENODEV;
 144                 dev_err(dev, "missing driver data\n");
 145                 goto e_err;
 146         }
 147
 148         sp->io_map = devm_platform_ioremap_resource(pdev, 0);
 149         if (IS_ERR(sp->io_map)) {
 150                 ret = PTR_ERR(sp->io_map);
 151                 goto e_err;
 152         }
 153
 154         attr = device_get_dma_attr(dev);
 155         if (attr == DEV_DMA_NOT_SUPPORTED) {
 156                 dev_err(dev, "DMA is not supported");
 157                 goto e_err;
 158         }
 159
 160         sp_platform->coherent = (attr == DEV_DMA_COHERENT);
 161         if (sp_platform->coherent)
 162                 sp->axcache = CACHE_WB_NO_ALLOC;
 163         else
 164                 sp->axcache = CACHE_NONE;
 165
 166         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
 167         if (ret) {
 168                 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
 169                 goto e_err;
 170         }
 171
 172         ret = sp_get_irqs(sp);
 173         if (ret)
 174                 goto e_err;
 175
 176         dev_set_drvdata(dev, sp);
 177
 178         ret = sp_init(sp);
 179         if (ret)
 180                 goto e_err;
 181
 182         dev_notice(dev, "enabled\n");
 183
 184         return 0;
 185
 186 e_err:
 187         dev_notice(dev, "initialization failed\n");
 188         return ret;
 189 }
 190
 191 static int sp_platform_remove(struct platform_device *pdev)
 192 {
 193         struct device *dev = &pdev->dev;
 194         struct sp_device *sp = dev_get_drvdata(dev);
 195
 196         sp_destroy(sp);
 197
 198         dev_notice(dev, "disabled\n");
 199
 200         return 0;
 201 }
 202
 203 #ifdef CONFIG_PM
 204 static int sp_platform_suspend(struct platform_device *pdev,
 205                                 pm_message_t state)
 206 {
 207         struct device *dev = &pdev->dev;
 208         struct sp_device *sp = dev_get_drvdata(dev);
 209
 210         return sp_suspend(sp, state);
 211 }
 212
 213 static int sp_platform_resume(struct platform_device *pdev)
 214 {
 215         struct device *dev = &pdev->dev;
 216         struct sp_device *sp = dev_get_drvdata(dev);
 217
 218         return sp_resume(sp);
 219 }
 220 #endif
 221
 222 static struct platform_driver sp_platform_driver = {
 223         .driver = {
 224                 .name = "ccp",
 225 #ifdef CONFIG_ACPI
 226                 .acpi_match_table = sp_acpi_match,
 227 #endif
 228 #ifdef CONFIG_OF
 229                 .of_match_table = sp_of_match,
 230 #endif
 231         },
 232         .probe = sp_platform_probe,
 233         .remove = sp_platform_remove,
 234 #ifdef CONFIG_PM
 235         .suspend = sp_platform_suspend,
 236         .resume = sp_platform_resume,
 237 #endif
 238 };
 239
 240 int sp_platform_init(void)
 241 {
 242         return platform_driver_register(&sp_platform_driver);
 243 }
 244
 245 void sp_platform_exit(void)
 246 {
 247         platform_driver_unregister(&sp_platform_driver);
 248 }