drivers/crypto/ccp/ccp-platform.c

   1 /*
   2  * AMD Cryptographic Coprocessor (CCP) driver
   3  *
   4  * Copyright (C) 2014 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 ccp_platform {
  32         int use_acpi;
  33         int coherent;
  34 };
  35
  36 static int ccp_get_irq(struct ccp_device *ccp)
  37 {
  38         struct device *dev = ccp->dev;
  39         struct platform_device *pdev = container_of(dev,
  40                                         struct platform_device, dev);
  41         int ret;
  42
  43         ret = platform_get_irq(pdev, 0);
  44         if (ret < 0)
  45                 return ret;
  46
  47         ccp->irq = ret;
  48         ret = request_irq(ccp->irq, ccp_irq_handler, 0, "ccp", dev);
  49         if (ret) {
  50                 dev_notice(dev, "unable to allocate IRQ (%d)\n", ret);
  51                 return ret;
  52         }
  53
  54         return 0;
  55 }
  56
  57 static int ccp_get_irqs(struct ccp_device *ccp)
  58 {
  59         struct device *dev = ccp->dev;
  60         int ret;
  61
  62         ret = ccp_get_irq(ccp);
  63         if (!ret)
  64                 return 0;
  65
  66         /* Couldn't get an interrupt */
  67         dev_notice(dev, "could not enable interrupts (%d)\n", ret);
  68
  69         return ret;
  70 }
  71
  72 static void ccp_free_irqs(struct ccp_device *ccp)
  73 {
  74         struct device *dev = ccp->dev;
  75
  76         free_irq(ccp->irq, dev);
  77 }
  78
  79 static struct resource *ccp_find_mmio_area(struct ccp_device *ccp)
  80 {
  81         struct device *dev = ccp->dev;
  82         struct platform_device *pdev = container_of(dev,
  83                                         struct platform_device, dev);
  84         struct resource *ior;
  85
  86         ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  87         if (ior && (resource_size(ior) >= 0x800))
  88                 return ior;
  89
  90         return NULL;
  91 }
  92
  93 static int ccp_platform_probe(struct platform_device *pdev)
  94 {
  95         struct ccp_device *ccp;
  96         struct ccp_platform *ccp_platform;
  97         struct device *dev = &pdev->dev;
  98         struct acpi_device *adev = ACPI_COMPANION(dev);
  99         struct resource *ior;
 100         int ret;
 101
 102         ret = -ENOMEM;
 103         ccp = ccp_alloc_struct(dev);
 104         if (!ccp)
 105                 goto e_err;
 106
 107         ccp_platform = devm_kzalloc(dev, sizeof(*ccp_platform), GFP_KERNEL);
 108         if (!ccp_platform)
 109                 goto e_err;
 110
 111         ccp->dev_specific = ccp_platform;
 112         ccp->get_irq = ccp_get_irqs;
 113         ccp->free_irq = ccp_free_irqs;
 114
 115         ccp_platform->use_acpi = (!adev || acpi_disabled) ? 0 : 1;
 116
 117         ior = ccp_find_mmio_area(ccp);
 118         ccp->io_map = devm_ioremap_resource(dev, ior);
 119         if (IS_ERR(ccp->io_map)) {
 120                 ret = PTR_ERR(ccp->io_map);
 121                 goto e_err;
 122         }
 123         ccp->io_regs = ccp->io_map;
 124
 125         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
 126         if (ret) {
 127                 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
 128                 goto e_err;
 129         }
 130
 131         ccp_platform->coherent = device_dma_is_coherent(ccp->dev);
 132         if (ccp_platform->coherent)
 133                 ccp->axcache = CACHE_WB_NO_ALLOC;
 134         else
 135                 ccp->axcache = CACHE_NONE;
 136
 137         dev_set_drvdata(dev, ccp);
 138
 139         ret = ccp_init(ccp);
 140         if (ret)
 141                 goto e_err;
 142
 143         dev_notice(dev, "enabled\n");
 144
 145         return 0;
 146
 147 e_err:
 148         dev_notice(dev, "initialization failed\n");
 149         return ret;
 150 }
 151
 152 static int ccp_platform_remove(struct platform_device *pdev)
 153 {
 154         struct device *dev = &pdev->dev;
 155         struct ccp_device *ccp = dev_get_drvdata(dev);
 156
 157         ccp_destroy(ccp);
 158
 159         dev_notice(dev, "disabled\n");
 160
 161         return 0;
 162 }
 163
 164 #ifdef CONFIG_PM
 165 static int ccp_platform_suspend(struct platform_device *pdev,
 166                                 pm_message_t state)
 167 {
 168         struct device *dev = &pdev->dev;
 169         struct ccp_device *ccp = dev_get_drvdata(dev);
 170         unsigned long flags;
 171         unsigned int i;
 172
 173         spin_lock_irqsave(&ccp->cmd_lock, flags);
 174
 175         ccp->suspending = 1;
 176
 177         /* Wake all the queue kthreads to prepare for suspend */
 178         for (i = 0; i < ccp->cmd_q_count; i++)
 179                 wake_up_process(ccp->cmd_q[i].kthread);
 180
 181         spin_unlock_irqrestore(&ccp->cmd_lock, flags);
 182
 183         /* Wait for all queue kthreads to say they're done */
 184         while (!ccp_queues_suspended(ccp))
 185                 wait_event_interruptible(ccp->suspend_queue,
 186                                          ccp_queues_suspended(ccp));
 187
 188         return 0;
 189 }
 190
 191 static int ccp_platform_resume(struct platform_device *pdev)
 192 {
 193         struct device *dev = &pdev->dev;
 194         struct ccp_device *ccp = dev_get_drvdata(dev);
 195         unsigned long flags;
 196         unsigned int i;
 197
 198         spin_lock_irqsave(&ccp->cmd_lock, flags);
 199
 200         ccp->suspending = 0;
 201
 202         /* Wake up all the kthreads */
 203         for (i = 0; i < ccp->cmd_q_count; i++) {
 204                 ccp->cmd_q[i].suspended = 0;
 205                 wake_up_process(ccp->cmd_q[i].kthread);
 206         }
 207
 208         spin_unlock_irqrestore(&ccp->cmd_lock, flags);
 209
 210         return 0;
 211 }
 212 #endif
 213
 214 #ifdef CONFIG_ACPI
 215 static const struct acpi_device_id ccp_acpi_match[] = {
 216         { "AMDI0C00", 0 },
 217         { },
 218 };
 219 MODULE_DEVICE_TABLE(acpi, ccp_acpi_match);
 220 #endif
 221
 222 #ifdef CONFIG_OF
 223 static const struct of_device_id ccp_of_match[] = {
 224         { .compatible = "amd,ccp-seattle-v1a" },
 225         { },
 226 };
 227 MODULE_DEVICE_TABLE(of, ccp_of_match);
 228 #endif
 229
 230 static struct platform_driver ccp_platform_driver = {
 231         .driver = {
 232                 .name = "AMD Cryptographic Coprocessor",
 233 #ifdef CONFIG_ACPI
 234                 .acpi_match_table = ccp_acpi_match,
 235 #endif
 236 #ifdef CONFIG_OF
 237                 .of_match_table = ccp_of_match,
 238 #endif
 239         },
 240         .probe = ccp_platform_probe,
 241         .remove = ccp_platform_remove,
 242 #ifdef CONFIG_PM
 243         .suspend = ccp_platform_suspend,
 244         .resume = ccp_platform_resume,
 245 #endif
 246 };
 247
 248 int ccp_platform_init(void)
 249 {
 250         return platform_driver_register(&ccp_platform_driver);
 251 }
 252
 253 void ccp_platform_exit(void)
 254 {
 255         platform_driver_unregister(&ccp_platform_driver);
 256 }