drivers/crypto/ccp/sp-platform.c

   1 /*
   2  * AMD Secure Processor device driver
   3  *
   4  * Copyright (C) 2014,2018 Advanced Micro Devices, Inc.
   5  *
   6  * Author: Tom Lendacky <thomas.lendacky@amd.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/device.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/ioport.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/kthread.h>
  20 #include <linux/sched.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/delay.h>
  24 #include <linux/ccp.h>
  25 #include <linux/of.h>
  26 #include <linux/of_address.h>
  27 #include <linux/acpi.h>
  28
  29 #include "ccp-dev.h"
  30
  31 struct sp_platform {
  32         int coherent;
  33         unsigned int irq_count;
  34 };
  35
  36 static const struct sp_dev_vdata dev_vdata[] = {
  37         {
  38                 .bar = 0,
  39 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
  40                 .ccp_vdata = &ccpv3_platform,
  41 #endif
  42         },
  43 };
  44
  45 #ifdef CONFIG_ACPI
  46 static const struct acpi_device_id sp_acpi_match[] = {
  47         { "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
  48         { },
  49 };
  50 MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
  51 #endif
  52
  53 #ifdef CONFIG_OF
  54 static const struct of_device_id sp_of_match[] = {
  55         { .compatible = "amd,ccp-seattle-v1a",
  56           .data = (const void *)&dev_vdata[0] },
  57         { },
  58 };
  59 MODULE_DEVICE_TABLE(of, sp_of_match);
  60 #endif
  61
  62 static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev)
  63 {
  64 #ifdef CONFIG_OF
  65         const struct of_device_id *match;
  66
  67         match = of_match_node(sp_of_match, pdev->dev.of_node);
  68         if (match && match->data)
  69                 return (struct sp_dev_vdata *)match->data;
  70 #endif
  71         return NULL;
  72 }
  73
  74 static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev)
  75 {
  76 #ifdef CONFIG_ACPI
  77         const struct acpi_device_id *match;
  78
  79         match = acpi_match_device(sp_acpi_match, &pdev->dev);
  80         if (match && match->driver_data)
  81                 return (struct sp_dev_vdata *)match->driver_data;
  82 #endif
  83         return NULL;
  84 }
  85
  86 static int sp_get_irqs(struct sp_device *sp)
  87 {
  88         struct sp_platform *sp_platform = sp->dev_specific;
  89         struct device *dev = sp->dev;
  90         struct platform_device *pdev = to_platform_device(dev);
  91         unsigned int i, count;
  92         int ret;
  93
  94         for (i = 0, count = 0; i < pdev->num_resources; i++) {
  95                 struct resource *res = &pdev->resource[i];
  96
  97                 if (resource_type(res) == IORESOURCE_IRQ)
  98                         count++;
  99         }
 100
 101         sp_platform->irq_count = count;
 102
 103         ret = platform_get_irq(pdev, 0);
 104         if (ret < 0) {
 105                 dev_notice(dev, "unable to get IRQ (%d)\n", ret);
 106                 return ret;
 107         }
 108
 109         sp->psp_irq = ret;
 110         if (count == 1) {
 111                 sp->ccp_irq = ret;
 112         } else {
 113                 ret = platform_get_irq(pdev, 1);
 114                 if (ret < 0) {
 115                         dev_notice(dev, "unable to get IRQ (%d)\n", ret);
 116                         return ret;
 117                 }
 118
 119                 sp->ccp_irq = ret;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static int sp_platform_probe(struct platform_device *pdev)
 126 {
 127         struct sp_device *sp;
 128         struct sp_platform *sp_platform;
 129         struct device *dev = &pdev->dev;
 130         enum dev_dma_attr attr;
 131         struct resource *ior;
 132         int ret;
 133
 134         ret = -ENOMEM;
 135         sp = sp_alloc_struct(dev);
 136         if (!sp)
 137                 goto e_err;
 138
 139         sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL);
 140         if (!sp_platform)
 141                 goto e_err;
 142
 143         sp->dev_specific = sp_platform;
 144         sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev)
 145                                          : sp_get_acpi_version(pdev);
 146         if (!sp->dev_vdata) {
 147                 ret = -ENODEV;
 148                 dev_err(dev, "missing driver data\n");
 149                 goto e_err;
 150         }
 151
 152         ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 153         sp->io_map = devm_ioremap_resource(dev, ior);
 154         if (IS_ERR(sp->io_map)) {
 155                 ret = PTR_ERR(sp->io_map);
 156                 goto e_err;
 157         }
 158
 159         attr = device_get_dma_attr(dev);
 160         if (attr == DEV_DMA_NOT_SUPPORTED) {
 161                 dev_err(dev, "DMA is not supported");
 162                 goto e_err;
 163         }
 164
 165         sp_platform->coherent = (attr == DEV_DMA_COHERENT);
 166         if (sp_platform->coherent)
 167                 sp->axcache = CACHE_WB_NO_ALLOC;
 168         else
 169                 sp->axcache = CACHE_NONE;
 170
 171         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
 172         if (ret) {
 173                 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
 174                 goto e_err;
 175         }
 176
 177         ret = sp_get_irqs(sp);
 178         if (ret)
 179                 goto e_err;
 180
 181         dev_set_drvdata(dev, sp);
 182
 183         ret = sp_init(sp);
 184         if (ret)
 185                 goto e_err;
 186
 187         dev_notice(dev, "enabled\n");
 188
 189         return 0;
 190
 191 e_err:
 192         dev_notice(dev, "initialization failed\n");
 193         return ret;
 194 }
 195
 196 static int sp_platform_remove(struct platform_device *pdev)
 197 {
 198         struct device *dev = &pdev->dev;
 199         struct sp_device *sp = dev_get_drvdata(dev);
 200
 201         sp_destroy(sp);
 202
 203         dev_notice(dev, "disabled\n");
 204
 205         return 0;
 206 }
 207
 208 #ifdef CONFIG_PM
 209 static int sp_platform_suspend(struct platform_device *pdev,
 210                                 pm_message_t state)
 211 {
 212         struct device *dev = &pdev->dev;
 213         struct sp_device *sp = dev_get_drvdata(dev);
 214
 215         return sp_suspend(sp, state);
 216 }
 217
 218 static int sp_platform_resume(struct platform_device *pdev)
 219 {
 220         struct device *dev = &pdev->dev;
 221         struct sp_device *sp = dev_get_drvdata(dev);
 222
 223         return sp_resume(sp);
 224 }
 225 #endif
 226
 227 static struct platform_driver sp_platform_driver = {
 228         .driver = {
 229                 .name = "ccp",
 230 #ifdef CONFIG_ACPI
 231                 .acpi_match_table = sp_acpi_match,
 232 #endif
 233 #ifdef CONFIG_OF
 234                 .of_match_table = sp_of_match,
 235 #endif
 236         },
 237         .probe = sp_platform_probe,
 238         .remove = sp_platform_remove,
 239 #ifdef CONFIG_PM
 240         .suspend = sp_platform_suspend,
 241         .resume = sp_platform_resume,
 242 #endif
 243 };
 244
 245 int sp_platform_init(void)
 246 {
 247         return platform_driver_register(&sp_platform_driver);
 248 }
 249
 250 void sp_platform_exit(void)
 251 {
 252         platform_driver_unregister(&sp_platform_driver);
 253 }