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