drivers/crypto/ccp/sp-platform.c

   1 /*
   2  * AMD Secure Processor device driver
   3  *
   4  * Copyright (C) 2014,2016 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 acpi_device_id sp_acpi_match[];
  37 static const struct of_device_id sp_of_match[];
  38
  39 static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev)
  40 {
  41 #ifdef CONFIG_OF
  42         const struct of_device_id *match;
  43
  44         match = of_match_node(sp_of_match, pdev->dev.of_node);
  45         if (match && match->data)
  46                 return (struct sp_dev_vdata *)match->data;
  47 #endif
  48         return NULL;
  49 }
  50
  51 static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev)
  52 {
  53 #ifdef CONFIG_ACPI
  54         const struct acpi_device_id *match;
  55
  56         match = acpi_match_device(sp_acpi_match, &pdev->dev);
  57         if (match && match->driver_data)
  58                 return (struct sp_dev_vdata *)match->driver_data;
  59 #endif
  60         return NULL;
  61 }
  62
  63 static int sp_get_irqs(struct sp_device *sp)
  64 {
  65         struct sp_platform *sp_platform = sp->dev_specific;
  66         struct device *dev = sp->dev;
  67         struct platform_device *pdev = to_platform_device(dev);
  68         unsigned int i, count;
  69         int ret;
  70
  71         for (i = 0, count = 0; i < pdev->num_resources; i++) {
  72                 struct resource *res = &pdev->resource[i];
  73
  74                 if (resource_type(res) == IORESOURCE_IRQ)
  75                         count++;
  76         }
  77
  78         sp_platform->irq_count = count;
  79
  80         ret = platform_get_irq(pdev, 0);
  81         if (ret < 0) {
  82                 dev_notice(dev, "unable to get IRQ (%d)\n", ret);
  83                 return ret;
  84         }
  85
  86         sp->psp_irq = ret;
  87         if (count == 1) {
  88                 sp->ccp_irq = ret;
  89         } else {
  90                 ret = platform_get_irq(pdev, 1);
  91                 if (ret < 0) {
  92                         dev_notice(dev, "unable to get IRQ (%d)\n", ret);
  93                         return ret;
  94                 }
  95
  96                 sp->ccp_irq = ret;
  97         }
  98
  99         return 0;
 100 }
 101
 102 static int sp_platform_probe(struct platform_device *pdev)
 103 {
 104         struct sp_device *sp;
 105         struct sp_platform *sp_platform;
 106         struct device *dev = &pdev->dev;
 107         enum dev_dma_attr attr;
 108         struct resource *ior;
 109         int ret;
 110
 111         ret = -ENOMEM;
 112         sp = sp_alloc_struct(dev);
 113         if (!sp)
 114                 goto e_err;
 115
 116         sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL);
 117         if (!sp_platform)
 118                 goto e_err;
 119
 120         sp->dev_specific = sp_platform;
 121         sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev)
 122                                          : sp_get_acpi_version(pdev);
 123         if (!sp->dev_vdata) {
 124                 ret = -ENODEV;
 125                 dev_err(dev, "missing driver data\n");
 126                 goto e_err;
 127         }
 128
 129         ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 130         sp->io_map = devm_ioremap_resource(dev, ior);
 131         if (IS_ERR(sp->io_map)) {
 132                 ret = PTR_ERR(sp->io_map);
 133                 goto e_err;
 134         }
 135
 136         attr = device_get_dma_attr(dev);
 137         if (attr == DEV_DMA_NOT_SUPPORTED) {
 138                 dev_err(dev, "DMA is not supported");
 139                 goto e_err;
 140         }
 141
 142         sp_platform->coherent = (attr == DEV_DMA_COHERENT);
 143         if (sp_platform->coherent)
 144                 sp->axcache = CACHE_WB_NO_ALLOC;
 145         else
 146                 sp->axcache = CACHE_NONE;
 147
 148         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
 149         if (ret) {
 150                 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
 151                 goto e_err;
 152         }
 153
 154         ret = sp_get_irqs(sp);
 155         if (ret)
 156                 goto e_err;
 157
 158         dev_set_drvdata(dev, sp);
 159
 160         ret = sp_init(sp);
 161         if (ret)
 162                 goto e_err;
 163
 164         dev_notice(dev, "enabled\n");
 165
 166         return 0;
 167
 168 e_err:
 169         dev_notice(dev, "initialization failed\n");
 170         return ret;
 171 }
 172
 173 static int sp_platform_remove(struct platform_device *pdev)
 174 {
 175         struct device *dev = &pdev->dev;
 176         struct sp_device *sp = dev_get_drvdata(dev);
 177
 178         sp_destroy(sp);
 179
 180         dev_notice(dev, "disabled\n");
 181
 182         return 0;
 183 }
 184
 185 #ifdef CONFIG_PM
 186 static int sp_platform_suspend(struct platform_device *pdev,
 187                                 pm_message_t state)
 188 {
 189         struct device *dev = &pdev->dev;
 190         struct sp_device *sp = dev_get_drvdata(dev);
 191
 192         return sp_suspend(sp, state);
 193 }
 194
 195 static int sp_platform_resume(struct platform_device *pdev)
 196 {
 197         struct device *dev = &pdev->dev;
 198         struct sp_device *sp = dev_get_drvdata(dev);
 199
 200         return sp_resume(sp);
 201 }
 202 #endif
 203
 204 static const struct sp_dev_vdata dev_vdata[] = {
 205         {
 206                 .bar = 0,
 207 #ifdef CONFIG_CRYPTO_DEV_SP_CCP
 208                 .ccp_vdata = &ccpv3_platform,
 209 #endif
 210         },
 211 };
 212
 213 #ifdef CONFIG_ACPI
 214 static const struct acpi_device_id sp_acpi_match[] = {
 215         { "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
 216         { },
 217 };
 218 MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
 219 #endif
 220
 221 #ifdef CONFIG_OF
 222 static const struct of_device_id sp_of_match[] = {
 223         { .compatible = "amd,ccp-seattle-v1a",
 224           .data = (const void *)&dev_vdata[0] },
 225         { },
 226 };
 227 MODULE_DEVICE_TABLE(of, sp_of_match);
 228 #endif
 229
 230 static struct platform_driver sp_platform_driver = {
 231         .driver = {
 232                 .name = "ccp",
 233 #ifdef CONFIG_ACPI
 234                 .acpi_match_table = sp_acpi_match,
 235 #endif
 236 #ifdef CONFIG_OF
 237                 .of_match_table = sp_of_match,
 238 #endif
 239         },
 240         .probe = sp_platform_probe,
 241         .remove = sp_platform_remove,
 242 #ifdef CONFIG_PM
 243         .suspend = sp_platform_suspend,
 244         .resume = sp_platform_resume,
 245 #endif
 246 };
 247
 248 int sp_platform_init(void)
 249 {
 250         return platform_driver_register(&sp_platform_driver);
 251 }
 252
 253 void sp_platform_exit(void)
 254 {
 255         platform_driver_unregister(&sp_platform_driver);
 256 }