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 coherent;
  33 };
  34
  35 static int ccp_get_irq(struct ccp_device *ccp)
  36 {
  37         struct device *dev = ccp->dev;
  38         struct platform_device *pdev = container_of(dev,
  39                                         struct platform_device, dev);
  40         int ret;
  41
  42         ret = platform_get_irq(pdev, 0);
  43         if (ret < 0)
  44                 return ret;
  45
  46         ccp->irq = ret;
  47         ret = request_irq(ccp->irq, ccp_irq_handler, 0, "ccp", dev);
  48         if (ret) {
  49                 dev_notice(dev, "unable to allocate IRQ (%d)\n", ret);
  50                 return ret;
  51         }
  52
  53         return 0;
  54 }
  55
  56 static int ccp_get_irqs(struct ccp_device *ccp)
  57 {
  58         struct device *dev = ccp->dev;
  59         int ret;
  60
  61         ret = ccp_get_irq(ccp);
  62         if (!ret)
  63                 return 0;
  64
  65         /* Couldn't get an interrupt */
  66         dev_notice(dev, "could not enable interrupts (%d)\n", ret);
  67
  68         return ret;
  69 }
  70
  71 static void ccp_free_irqs(struct ccp_device *ccp)
  72 {
  73         struct device *dev = ccp->dev;
  74
  75         free_irq(ccp->irq, dev);
  76 }
  77
  78 static struct resource *ccp_find_mmio_area(struct ccp_device *ccp)
  79 {
  80         struct device *dev = ccp->dev;
  81         struct platform_device *pdev = container_of(dev,
  82                                         struct platform_device, dev);
  83         struct resource *ior;
  84
  85         ior = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  86         if (ior && (resource_size(ior) >= 0x800))
  87                 return ior;
  88
  89         return NULL;
  90 }
  91
  92 static int ccp_platform_probe(struct platform_device *pdev)
  93 {
  94         struct ccp_device *ccp;
  95         struct ccp_platform *ccp_platform;
  96         struct device *dev = &pdev->dev;
  97         enum dev_dma_attr attr;
  98         struct resource *ior;
  99         int ret;
 100
 101         ret = -ENOMEM;
 102         ccp = ccp_alloc_struct(dev);
 103         if (!ccp)
 104                 goto e_err;
 105
 106         ccp_platform = devm_kzalloc(dev, sizeof(*ccp_platform), GFP_KERNEL);
 107         if (!ccp_platform)
 108                 goto e_err;
 109
 110         ccp->dev_specific = ccp_platform;
 111         ccp->get_irq = ccp_get_irqs;
 112         ccp->free_irq = ccp_free_irqs;
 113
 114         ior = ccp_find_mmio_area(ccp);
 115         ccp->io_map = devm_ioremap_resource(dev, ior);
 116         if (IS_ERR(ccp->io_map)) {
 117                 ret = PTR_ERR(ccp->io_map);
 118                 goto e_err;
 119         }
 120         ccp->io_regs = ccp->io_map;
 121
 122         attr = device_get_dma_attr(dev);
 123         if (attr == DEV_DMA_NOT_SUPPORTED) {
 124                 dev_err(dev, "DMA is not supported");
 125                 goto e_err;
 126         }
 127
 128         ccp_platform->coherent = (attr == DEV_DMA_COHERENT);
 129         if (ccp_platform->coherent)
 130                 ccp->axcache = CACHE_WB_NO_ALLOC;
 131         else
 132                 ccp->axcache = CACHE_NONE;
 133
 134         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
 135         if (ret) {
 136                 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
 137                 goto e_err;
 138         }
 139
 140         dev_set_drvdata(dev, ccp);
 141
 142         ret = ccp_init(ccp);
 143         if (ret)
 144                 goto e_err;
 145
 146         dev_notice(dev, "enabled\n");
 147
 148         return 0;
 149
 150 e_err:
 151         dev_notice(dev, "initialization failed\n");
 152         return ret;
 153 }
 154
 155 static int ccp_platform_remove(struct platform_device *pdev)
 156 {
 157         struct device *dev = &pdev->dev;
 158         struct ccp_device *ccp = dev_get_drvdata(dev);
 159
 160         ccp_destroy(ccp);
 161
 162         dev_notice(dev, "disabled\n");
 163
 164         return 0;
 165 }
 166
 167 #ifdef CONFIG_PM
 168 static int ccp_platform_suspend(struct platform_device *pdev,
 169                                 pm_message_t state)
 170 {
 171         struct device *dev = &pdev->dev;
 172         struct ccp_device *ccp = dev_get_drvdata(dev);
 173         unsigned long flags;
 174         unsigned int i;
 175
 176         spin_lock_irqsave(&ccp->cmd_lock, flags);
 177
 178         ccp->suspending = 1;
 179
 180         /* Wake all the queue kthreads to prepare for suspend */
 181         for (i = 0; i < ccp->cmd_q_count; i++)
 182                 wake_up_process(ccp->cmd_q[i].kthread);
 183
 184         spin_unlock_irqrestore(&ccp->cmd_lock, flags);
 185
 186         /* Wait for all queue kthreads to say they're done */
 187         while (!ccp_queues_suspended(ccp))
 188                 wait_event_interruptible(ccp->suspend_queue,
 189                                          ccp_queues_suspended(ccp));
 190
 191         return 0;
 192 }
 193
 194 static int ccp_platform_resume(struct platform_device *pdev)
 195 {
 196         struct device *dev = &pdev->dev;
 197         struct ccp_device *ccp = dev_get_drvdata(dev);
 198         unsigned long flags;
 199         unsigned int i;
 200
 201         spin_lock_irqsave(&ccp->cmd_lock, flags);
 202
 203         ccp->suspending = 0;
 204
 205         /* Wake up all the kthreads */
 206         for (i = 0; i < ccp->cmd_q_count; i++) {
 207                 ccp->cmd_q[i].suspended = 0;
 208                 wake_up_process(ccp->cmd_q[i].kthread);
 209         }
 210
 211         spin_unlock_irqrestore(&ccp->cmd_lock, flags);
 212
 213         return 0;
 214 }
 215 #endif
 216
 217 #ifdef CONFIG_ACPI
 218 static const struct acpi_device_id ccp_acpi_match[] = {
 219         { "AMDI0C00", 0 },
 220         { },
 221 };
 222 MODULE_DEVICE_TABLE(acpi, ccp_acpi_match);
 223 #endif
 224
 225 #ifdef CONFIG_OF
 226 static const struct of_device_id ccp_of_match[] = {
 227         { .compatible = "amd,ccp-seattle-v1a" },
 228         { },
 229 };
 230 MODULE_DEVICE_TABLE(of, ccp_of_match);
 231 #endif
 232
 233 static struct platform_driver ccp_platform_driver = {
 234         .driver = {
 235                 .name = "ccp",
 236 #ifdef CONFIG_ACPI
 237                 .acpi_match_table = ccp_acpi_match,
 238 #endif
 239 #ifdef CONFIG_OF
 240                 .of_match_table = ccp_of_match,
 241 #endif
 242         },
 243         .probe = ccp_platform_probe,
 244         .remove = ccp_platform_remove,
 245 #ifdef CONFIG_PM
 246         .suspend = ccp_platform_suspend,
 247         .resume = ccp_platform_resume,
 248 #endif
 249 };
 250
 251 int ccp_platform_init(void)
 252 {
 253         return platform_driver_register(&ccp_platform_driver);
 254 }
 255
 256 void ccp_platform_exit(void)
 257 {
 258         platform_driver_unregister(&ccp_platform_driver);
 259 }