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 <thomas.lendacky@amd.com>
   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 static const struct acpi_device_id sp_acpi_match[] = {
  43         { "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
  44         { },
  45 };
  46 MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
  47
  48 static const struct of_device_id sp_of_match[] = {
  49         { .compatible = "amd,ccp-seattle-v1a",
  50           .data = (const void *)&dev_vdata[0] },
  51         { },
  52 };
  53 MODULE_DEVICE_TABLE(of, sp_of_match);
  54
  55 static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev)
  56 {
  57         const struct of_device_id *match;
  58
  59         match = of_match_node(sp_of_match, pdev->dev.of_node);
  60         if (match && match->data)
  61                 return (struct sp_dev_vdata *)match->data;
  62
  63         return NULL;
  64 }
  65
  66 static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev)
  67 {
  68         const struct acpi_device_id *match;
  69
  70         match = acpi_match_device(sp_acpi_match, &pdev->dev);
  71         if (match && match->driver_data)
  72                 return (struct sp_dev_vdata *)match->driver_data;
  73
  74         return NULL;
  75 }
  76
  77 static int sp_get_irqs(struct sp_device *sp)
  78 {
  79         struct sp_platform *sp_platform = sp->dev_specific;
  80         struct device *dev = sp->dev;
  81         struct platform_device *pdev = to_platform_device(dev);
  82         int ret;
  83
  84         sp_platform->irq_count = platform_irq_count(pdev);
  85
  86         ret = platform_get_irq(pdev, 0);
  87         if (ret < 0) {
  88                 dev_notice(dev, "unable to get IRQ (%d)\n", ret);
  89                 return ret;
  90         }
  91
  92         sp->psp_irq = ret;
  93         if (sp_platform->irq_count == 1) {
  94                 sp->ccp_irq = ret;
  95         } else {
  96                 ret = platform_get_irq(pdev, 1);
  97                 if (ret < 0) {
  98                         dev_notice(dev, "unable to get IRQ (%d)\n", ret);
  99                         return ret;
 100                 }
 101
 102                 sp->ccp_irq = ret;
 103         }
 104
 105         return 0;
 106 }
 107
 108 static int sp_platform_probe(struct platform_device *pdev)
 109 {
 110         struct sp_device *sp;
 111         struct sp_platform *sp_platform;
 112         struct device *dev = &pdev->dev;
 113         enum dev_dma_attr attr;
 114         int ret;
 115
 116         ret = -ENOMEM;
 117         sp = sp_alloc_struct(dev);
 118         if (!sp)
 119                 goto e_err;
 120
 121         sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL);
 122         if (!sp_platform)
 123                 goto e_err;
 124
 125         sp->dev_specific = sp_platform;
 126         sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev)
 127                                          : sp_get_acpi_version(pdev);
 128         if (!sp->dev_vdata) {
 129                 ret = -ENODEV;
 130                 dev_err(dev, "missing driver data\n");
 131                 goto e_err;
 132         }
 133
 134         sp->io_map = devm_platform_ioremap_resource(pdev, 0);
 135         if (IS_ERR(sp->io_map)) {
 136                 ret = PTR_ERR(sp->io_map);
 137                 goto e_err;
 138         }
 139
 140         attr = device_get_dma_attr(dev);
 141         if (attr == DEV_DMA_NOT_SUPPORTED) {
 142                 dev_err(dev, "DMA is not supported");
 143                 goto e_err;
 144         }
 145
 146         sp_platform->coherent = (attr == DEV_DMA_COHERENT);
 147         if (sp_platform->coherent)
 148                 sp->axcache = CACHE_WB_NO_ALLOC;
 149         else
 150                 sp->axcache = CACHE_NONE;
 151
 152         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
 153         if (ret) {
 154                 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
 155                 goto e_err;
 156         }
 157
 158         ret = sp_get_irqs(sp);
 159         if (ret)
 160                 goto e_err;
 161
 162         dev_set_drvdata(dev, sp);
 163
 164         ret = sp_init(sp);
 165         if (ret)
 166                 goto e_err;
 167
 168         dev_notice(dev, "enabled\n");
 169
 170         return 0;
 171
 172 e_err:
 173         dev_notice(dev, "initialization failed\n");
 174         return ret;
 175 }
 176
 177 static void sp_platform_remove(struct platform_device *pdev)
 178 {
 179         struct device *dev = &pdev->dev;
 180         struct sp_device *sp = dev_get_drvdata(dev);
 181
 182         sp_destroy(sp);
 183
 184         dev_notice(dev, "disabled\n");
 185 }
 186
 187 #ifdef CONFIG_PM
 188 static int sp_platform_suspend(struct platform_device *pdev,
 189                                 pm_message_t state)
 190 {
 191         struct device *dev = &pdev->dev;
 192         struct sp_device *sp = dev_get_drvdata(dev);
 193
 194         return sp_suspend(sp);
 195 }
 196
 197 static int sp_platform_resume(struct platform_device *pdev)
 198 {
 199         struct device *dev = &pdev->dev;
 200         struct sp_device *sp = dev_get_drvdata(dev);
 201
 202         return sp_resume(sp);
 203 }
 204 #endif
 205
 206 static struct platform_driver sp_platform_driver = {
 207         .driver = {
 208                 .name = "ccp",
 209                 .acpi_match_table = sp_acpi_match,
 210                 .of_match_table = sp_of_match,
 211         },
 212         .probe = sp_platform_probe,
 213         .remove_new = sp_platform_remove,
 214 #ifdef CONFIG_PM
 215         .suspend = sp_platform_suspend,
 216         .resume = sp_platform_resume,
 217 #endif
 218 };
 219
 220 int sp_platform_init(void)
 221 {
 222         return platform_driver_register(&sp_platform_driver);
 223 }
 224
 225 void sp_platform_exit(void)
 226 {
 227         platform_driver_unregister(&sp_platform_driver);
 228 }