drivers/ntb/hw/amd/ntb_hw_amd.h

   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  *
   7  *   Copyright (C) 2016 Advanced Micro Devices, Inc. All Rights Reserved.
   8  *
   9  *   This program is free software; you can redistribute it and/or modify
  10  *   it under the terms of version 2 of the GNU General Public License as
  11  *   published by the Free Software Foundation.
  12  *
  13  *   BSD LICENSE
  14  *
  15  *   Copyright (C) 2016 Advanced Micro Devices, Inc. All Rights Reserved.
  16  *
  17  *   Redistribution and use in source and binary forms, with or without
  18  *   modification, are permitted provided that the following conditions
  19  *   are met:
  20  *
  21  *     * Redistributions of source code must retain the above copyright
  22  *       notice, this list of conditions and the following disclaimer.
  23  *     * Redistributions in binary form must reproduce the above copy
  24  *       notice, this list of conditions and the following disclaimer in
  25  *       the documentation and/or other materials provided with the
  26  *       distribution.
  27  *     * Neither the name of AMD Corporation nor the names of its
  28  *       contributors may be used to endorse or promote products derived
  29  *       from this software without specific prior written permission.
  30  *
  31  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  34  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  36  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  37  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  38  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  39  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  40  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  41  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  42  *
  43  * AMD PCIe NTB Linux driver
  44  *
  45  * Contact Information:
  46  * Xiangliang Yu <Xiangliang.Yu@amd.com>
  47  */
  48
  49 #ifndef NTB_HW_AMD_H
  50 #define NTB_HW_AMD_H
  51
  52 #include <linux/ntb.h>
  53 #include <linux/pci.h>
  54
  55 #define AMD_LINK_HB_TIMEOUT     msecs_to_jiffies(1000)
  56 #define NTB_LNK_STA_SPEED_MASK  0x000F0000
  57 #define NTB_LNK_STA_WIDTH_MASK  0x03F00000
  58 #define NTB_LNK_STA_SPEED(x)    (((x) & NTB_LNK_STA_SPEED_MASK) >> 16)
  59 #define NTB_LNK_STA_WIDTH(x)    (((x) & NTB_LNK_STA_WIDTH_MASK) >> 20)
  60
  61 #ifndef read64
  62 #ifdef readq
  63 #define read64 readq
  64 #else
  65 #define read64 _read64
  66 static inline u64 _read64(void __iomem *mmio)
  67 {
  68         u64 low, high;
  69
  70         low = readl(mmio);
  71         high = readl(mmio + sizeof(u32));
  72         return low | (high << 32);
  73 }
  74 #endif
  75 #endif
  76
  77 #ifndef write64
  78 #ifdef writeq
  79 #define write64 writeq
  80 #else
  81 #define write64 _write64
  82 static inline void _write64(u64 val, void __iomem *mmio)
  83 {
  84         writel(val, mmio);
  85         writel(val >> 32, mmio + sizeof(u32));
  86 }
  87 #endif
  88 #endif
  89
  90 enum {
  91         /* AMD NTB Capability */
  92         AMD_DB_CNT              = 16,
  93         AMD_MSIX_VECTOR_CNT     = 24,
  94         AMD_SPADS_CNT           = 16,
  95
  96         /*  AMD NTB register offset */
  97         AMD_CNTL_OFFSET         = 0x200,
  98
  99         /* NTB control register bits */
 100         PMM_REG_CTL             = BIT(21),
 101         SMM_REG_CTL             = BIT(20),
 102         SMM_REG_ACC_PATH        = BIT(18),
 103         PMM_REG_ACC_PATH        = BIT(17),
 104         NTB_CLK_EN              = BIT(16),
 105
 106         AMD_STA_OFFSET          = 0x204,
 107         AMD_PGSLV_OFFSET        = 0x208,
 108         AMD_SPAD_MUX_OFFSET     = 0x20C,
 109         AMD_SPAD_OFFSET         = 0x210,
 110         AMD_RSMU_HCID           = 0x250,
 111         AMD_RSMU_SIID           = 0x254,
 112         AMD_PSION_OFFSET        = 0x300,
 113         AMD_SSION_OFFSET        = 0x330,
 114         AMD_MMINDEX_OFFSET      = 0x400,
 115         AMD_MMDATA_OFFSET       = 0x404,
 116         AMD_SIDEINFO_OFFSET     = 0x408,
 117
 118         AMD_SIDE_MASK           = BIT(0),
 119         AMD_SIDE_READY          = BIT(1),
 120
 121         /* limit register */
 122         AMD_ROMBARLMT_OFFSET    = 0x410,
 123         AMD_BAR1LMT_OFFSET      = 0x414,
 124         AMD_BAR23LMT_OFFSET     = 0x418,
 125         AMD_BAR45LMT_OFFSET     = 0x420,
 126         /* xlat address */
 127         AMD_POMBARXLAT_OFFSET   = 0x428,
 128         AMD_BAR1XLAT_OFFSET     = 0x430,
 129         AMD_BAR23XLAT_OFFSET    = 0x438,
 130         AMD_BAR45XLAT_OFFSET    = 0x440,
 131         /* doorbell and interrupt */
 132         AMD_DBFM_OFFSET         = 0x450,
 133         AMD_DBREQ_OFFSET        = 0x454,
 134         AMD_MIRRDBSTAT_OFFSET   = 0x458,
 135         AMD_DBMASK_OFFSET       = 0x45C,
 136         AMD_DBSTAT_OFFSET       = 0x460,
 137         AMD_INTMASK_OFFSET      = 0x470,
 138         AMD_INTSTAT_OFFSET      = 0x474,
 139
 140         /* event type */
 141         AMD_PEER_FLUSH_EVENT    = BIT(0),
 142         AMD_PEER_RESET_EVENT    = BIT(1),
 143         AMD_PEER_D3_EVENT       = BIT(2),
 144         AMD_PEER_PMETO_EVENT    = BIT(3),
 145         AMD_PEER_D0_EVENT       = BIT(4),
 146         AMD_LINK_UP_EVENT       = BIT(5),
 147         AMD_LINK_DOWN_EVENT     = BIT(6),
 148         AMD_EVENT_INTMASK       = (AMD_PEER_FLUSH_EVENT |
 149                                 AMD_PEER_RESET_EVENT | AMD_PEER_D3_EVENT |
 150                                 AMD_PEER_PMETO_EVENT | AMD_PEER_D0_EVENT |
 151                                 AMD_LINK_UP_EVENT | AMD_LINK_DOWN_EVENT),
 152
 153         AMD_PMESTAT_OFFSET      = 0x480,
 154         AMD_PMSGTRIG_OFFSET     = 0x490,
 155         AMD_LTRLATENCY_OFFSET   = 0x494,
 156         AMD_FLUSHTRIG_OFFSET    = 0x498,
 157
 158         /* SMU register*/
 159         AMD_SMUACK_OFFSET       = 0x4A0,
 160         AMD_SINRST_OFFSET       = 0x4A4,
 161         AMD_RSPNUM_OFFSET       = 0x4A8,
 162         AMD_SMU_SPADMUTEX       = 0x4B0,
 163         AMD_SMU_SPADOFFSET      = 0x4B4,
 164
 165         AMD_PEER_OFFSET         = 0x400,
 166 };
 167
 168 struct ntb_dev_data {
 169         const unsigned char mw_count;
 170         const unsigned int mw_idx;
 171 };
 172
 173 struct amd_ntb_dev;
 174
 175 struct amd_ntb_vec {
 176         struct amd_ntb_dev      *ndev;
 177         int                     num;
 178 };
 179
 180 struct amd_ntb_dev {
 181         struct ntb_dev ntb;
 182
 183         u32 ntb_side;
 184         u32 lnk_sta;
 185         u32 cntl_sta;
 186         u32 peer_sta;
 187
 188         struct ntb_dev_data *dev_data;
 189         unsigned char mw_count;
 190         unsigned char spad_count;
 191         unsigned char db_count;
 192         unsigned char msix_vec_count;
 193
 194         u64 db_valid_mask;
 195         u64 db_mask;
 196         u64 db_last_bit;
 197         u32 int_mask;
 198
 199         struct msix_entry *msix;
 200         struct amd_ntb_vec *vec;
 201
 202         /* synchronize rmw access of db_mask and hw reg */
 203         spinlock_t db_mask_lock;
 204
 205         void __iomem *self_mmio;
 206         void __iomem *peer_mmio;
 207         unsigned int self_spad;
 208         unsigned int peer_spad;
 209
 210         struct delayed_work hb_timer;
 211
 212         struct dentry *debugfs_dir;
 213         struct dentry *debugfs_info;
 214 };
 215
 216 #define ntb_ndev(__ntb) container_of(__ntb, struct amd_ntb_dev, ntb)
 217 #define hb_ndev(__work) container_of(__work, struct amd_ntb_dev, hb_timer.work)
 218
 219 static void amd_set_side_info_reg(struct amd_ntb_dev *ndev, bool peer);
 220 static void amd_clear_side_info_reg(struct amd_ntb_dev *ndev, bool peer);
 221 static int amd_poll_link(struct amd_ntb_dev *ndev);
 222
 223 #endif