drivers/thunderbolt/nhi_regs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Thunderbolt driver - NHI registers
   4  *
   5  * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
   6  * Copyright (C) 2018, Intel Corporation
   7  */
   8
   9 #ifndef NHI_REGS_H_
  10 #define NHI_REGS_H_
  11
  12 #include <linux/types.h>
  13
  14 enum ring_flags {
  15         RING_FLAG_ISOCH_ENABLE = 1 << 27, /* TX only? */
  16         RING_FLAG_E2E_FLOW_CONTROL = 1 << 28,
  17         RING_FLAG_PCI_NO_SNOOP = 1 << 29,
  18         RING_FLAG_RAW = 1 << 30, /* ignore EOF/SOF mask, include checksum */
  19         RING_FLAG_ENABLE = 1 << 31,
  20 };
  21
  22 /**
  23  * struct ring_desc - TX/RX ring entry
  24  *
  25  * For TX set length/eof/sof.
  26  * For RX length/eof/sof are set by the NHI.
  27  */
  28 struct ring_desc {
  29         u64 phys;
  30         u32 length:12;
  31         u32 eof:4;
  32         u32 sof:4;
  33         enum ring_desc_flags flags:12;
  34         u32 time; /* write zero */
  35 } __packed;
  36
  37 /* NHI registers in bar 0 */
  38
  39 /*
  40  * 16 bytes per entry, one entry for every hop (REG_HOP_COUNT)
  41  * 00: physical pointer to an array of struct ring_desc
  42  * 08: ring tail (set by NHI)
  43  * 10: ring head (index of first non posted descriptor)
  44  * 12: descriptor count
  45  */
  46 #define REG_TX_RING_BASE        0x00000
  47
  48 /*
  49  * 16 bytes per entry, one entry for every hop (REG_HOP_COUNT)
  50  * 00: physical pointer to an array of struct ring_desc
  51  * 08: ring head (index of first not posted descriptor)
  52  * 10: ring tail (set by NHI)
  53  * 12: descriptor count
  54  * 14: max frame sizes (anything larger than 0x100 has no effect)
  55  */
  56 #define REG_RX_RING_BASE        0x08000
  57
  58 /*
  59  * 32 bytes per entry, one entry for every hop (REG_HOP_COUNT)
  60  * 00: enum_ring_flags
  61  * 04: isoch time stamp ?? (write 0)
  62  * ..: unknown
  63  */
  64 #define REG_TX_OPTIONS_BASE     0x19800
  65
  66 /*
  67  * 32 bytes per entry, one entry for every hop (REG_HOP_COUNT)
  68  * 00: enum ring_flags
  69  *     If RING_FLAG_E2E_FLOW_CONTROL is set then bits 13-23 must be set to
  70  *     the corresponding TX hop id.
  71  * 04: EOF/SOF mask (ignored for RING_FLAG_RAW rings)
  72  * ..: unknown
  73  */
  74 #define REG_RX_OPTIONS_BASE     0x29800
  75 #define REG_RX_OPTIONS_E2E_HOP_MASK     GENMASK(22, 12)
  76 #define REG_RX_OPTIONS_E2E_HOP_SHIFT    12
  77
  78 /*
  79  * three bitfields: tx, rx, rx overflow
  80  * Every bitfield contains one bit for every hop (REG_HOP_COUNT). Registers are
  81  * cleared on read. New interrupts are fired only after ALL registers have been
  82  * read (even those containing only disabled rings).
  83  */
  84 #define REG_RING_NOTIFY_BASE    0x37800
  85 #define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32)
  86
  87 /*
  88  * two bitfields: rx, tx
  89  * Both bitfields contains one bit for every hop (REG_HOP_COUNT). To
  90  * enable/disable interrupts set/clear the corresponding bits.
  91  */
  92 #define REG_RING_INTERRUPT_BASE 0x38200
  93 #define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
  94
  95 #define REG_INT_THROTTLING_RATE 0x38c00
  96
  97 /* Interrupt Vector Allocation */
  98 #define REG_INT_VEC_ALLOC_BASE  0x38c40
  99 #define REG_INT_VEC_ALLOC_BITS  4
 100 #define REG_INT_VEC_ALLOC_MASK  GENMASK(3, 0)
 101 #define REG_INT_VEC_ALLOC_REGS  (32 / REG_INT_VEC_ALLOC_BITS)
 102
 103 /* The last 11 bits contain the number of hops supported by the NHI port. */
 104 #define REG_HOP_COUNT           0x39640
 105
 106 #define REG_DMA_MISC                    0x39864
 107 #define REG_DMA_MISC_INT_AUTO_CLEAR     BIT(2)
 108
 109 #define REG_INMAIL_DATA                 0x39900
 110
 111 #define REG_INMAIL_CMD                  0x39904
 112 #define REG_INMAIL_CMD_MASK             GENMASK(7, 0)
 113 #define REG_INMAIL_ERROR                BIT(30)
 114 #define REG_INMAIL_OP_REQUEST           BIT(31)
 115
 116 #define REG_OUTMAIL_CMD                 0x3990c
 117 #define REG_OUTMAIL_CMD_OPMODE_SHIFT    8
 118 #define REG_OUTMAIL_CMD_OPMODE_MASK     GENMASK(11, 8)
 119
 120 #define REG_FW_STS                      0x39944
 121 #define REG_FW_STS_NVM_AUTH_DONE        BIT(31)
 122 #define REG_FW_STS_CIO_RESET_REQ        BIT(30)
 123 #define REG_FW_STS_ICM_EN_CPU           BIT(2)
 124 #define REG_FW_STS_ICM_EN_INVERT        BIT(1)
 125 #define REG_FW_STS_ICM_EN               BIT(0)
 126
 127 #endif