drivers/crypto/qat/qat_dh895xcc/adf_admin.c

   1 /*
   2   This file is provided under a dual BSD/GPLv2 license.  When using or
   3   redistributing this file, you may do so under either license.
   4
   5   GPL LICENSE SUMMARY
   6   Copyright(c) 2014 Intel Corporation.
   7   This program is free software; you can redistribute it and/or modify
   8   it under the terms of version 2 of the GNU General Public License as
   9   published by the Free Software Foundation.
  10
  11   This program is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14   General Public License for more details.
  15
  16   Contact Information:
  17   qat-linux@intel.com
  18
  19   BSD LICENSE
  20   Copyright(c) 2014 Intel Corporation.
  21   Redistribution and use in source and binary forms, with or without
  22   modification, are permitted provided that the following conditions
  23   are met:
  24
  25     * Redistributions of source code must retain the above copyright
  26       notice, this list of conditions and the following disclaimer.
  27     * Redistributions in binary form must reproduce the above copyright
  28       notice, this list of conditions and the following disclaimer in
  29       the documentation and/or other materials provided with the
  30       distribution.
  31     * Neither the name of Intel Corporation nor the names of its
  32       contributors may be used to endorse or promote products derived
  33       from this software without specific prior written permission.
  34
  35   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  36   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  37   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  38   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  39   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  41   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  42   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  43   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  44   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  45   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  46 */
  47 #include <linux/types.h>
  48 #include <linux/mutex.h>
  49 #include <linux/slab.h>
  50 #include <linux/delay.h>
  51 #include <linux/pci.h>
  52 #include <linux/dma-mapping.h>
  53 #include <adf_accel_devices.h>
  54 #include "adf_drv.h"
  55 #include "adf_dh895xcc_hw_data.h"
  56
  57 #define ADF_ADMINMSG_LEN 32
  58
  59 struct adf_admin_comms {
  60         dma_addr_t phy_addr;
  61         void *virt_addr;
  62         void __iomem *mailbox_addr;
  63         struct mutex lock;      /* protects adf_admin_comms struct */
  64 };
  65
  66 int adf_put_admin_msg_sync(struct adf_accel_dev *accel_dev,
  67                            uint32_t ae, void *in, void *out)
  68 {
  69         struct adf_admin_comms *admin = accel_dev->admin;
  70         int offset = ae * ADF_ADMINMSG_LEN * 2;
  71         void __iomem *mailbox = admin->mailbox_addr;
  72         int mb_offset = ae * ADF_DH895XCC_MAILBOX_STRIDE;
  73         int times, received;
  74
  75         mutex_lock(&admin->lock);
  76
  77         if (ADF_CSR_RD(mailbox, mb_offset) == 1) {
  78                 mutex_unlock(&admin->lock);
  79                 return -EAGAIN;
  80         }
  81
  82         memcpy(admin->virt_addr + offset, in, ADF_ADMINMSG_LEN);
  83         ADF_CSR_WR(mailbox, mb_offset, 1);
  84         received = 0;
  85         for (times = 0; times < 50; times++) {
  86                 msleep(20);
  87                 if (ADF_CSR_RD(mailbox, mb_offset) == 0) {
  88                         received = 1;
  89                         break;
  90                 }
  91         }
  92         if (received)
  93                 memcpy(out, admin->virt_addr + offset +
  94                        ADF_ADMINMSG_LEN, ADF_ADMINMSG_LEN);
  95         else
  96                 dev_err(&GET_DEV(accel_dev),
  97                         "Failed to send admin msg to accelerator\n");
  98
  99         mutex_unlock(&admin->lock);
 100         return received ? 0 : -EFAULT;
 101 }
 102
 103 int adf_init_admin_comms(struct adf_accel_dev *accel_dev)
 104 {
 105         struct adf_admin_comms *admin;
 106         struct adf_bar *pmisc = &GET_BARS(accel_dev)[ADF_DH895XCC_PMISC_BAR];
 107         void __iomem *csr = pmisc->virt_addr;
 108         void __iomem *mailbox = csr + ADF_DH895XCC_MAILBOX_BASE_OFFSET;
 109         uint64_t reg_val;
 110
 111         admin = kzalloc_node(sizeof(*accel_dev->admin), GFP_KERNEL,
 112                              dev_to_node(&GET_DEV(accel_dev)));
 113         if (!admin)
 114                 return -ENOMEM;
 115         admin->virt_addr = dma_zalloc_coherent(&GET_DEV(accel_dev), PAGE_SIZE,
 116                                                &admin->phy_addr, GFP_KERNEL);
 117         if (!admin->virt_addr) {
 118                 dev_err(&GET_DEV(accel_dev), "Failed to allocate dma buff\n");
 119                 kfree(admin);
 120                 return -ENOMEM;
 121         }
 122         reg_val = (uint64_t)admin->phy_addr;
 123         ADF_CSR_WR(csr, ADF_DH895XCC_ADMINMSGUR_OFFSET, reg_val >> 32);
 124         ADF_CSR_WR(csr, ADF_DH895XCC_ADMINMSGLR_OFFSET, reg_val);
 125         mutex_init(&admin->lock);
 126         admin->mailbox_addr = mailbox;
 127         accel_dev->admin = admin;
 128         return 0;
 129 }
 130
 131 void adf_exit_admin_comms(struct adf_accel_dev *accel_dev)
 132 {
 133         struct adf_admin_comms *admin = accel_dev->admin;
 134
 135         if (!admin)
 136                 return;
 137
 138         if (admin->virt_addr)
 139                 dma_free_coherent(&GET_DEV(accel_dev), PAGE_SIZE,
 140                                   admin->virt_addr, admin->phy_addr);
 141
 142         mutex_destroy(&admin->lock);
 143         kfree(admin);
 144         accel_dev->admin = NULL;
 145 }