1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Thunderbolt driver - NHI registers
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
11 #include <linux/types.h>
14 RING_FLAG_ISOCH_ENABLE = 1 << 27, /* TX only? */
15 RING_FLAG_E2E_FLOW_CONTROL = 1 << 28,
16 RING_FLAG_PCI_NO_SNOOP = 1 << 29,
17 RING_FLAG_RAW = 1 << 30, /* ignore EOF/SOF mask, include checksum */
18 RING_FLAG_ENABLE = 1 << 31,
21 enum ring_desc_flags {
22 RING_DESC_ISOCH = 0x1, /* TX only? */
23 RING_DESC_COMPLETED = 0x2, /* set by NHI */
24 RING_DESC_POSTED = 0x4, /* always set this */
25 RING_DESC_INTERRUPT = 0x8, /* request an interrupt on completion */
29 * struct ring_desc - TX/RX ring entry
31 * For TX set length/eof/sof.
32 * For RX length/eof/sof are set by the NHI.
39 enum ring_desc_flags flags:12;
40 u32 time; /* write zero */
43 /* NHI registers in bar 0 */
46 * 16 bytes per entry, one entry for every hop (REG_HOP_COUNT)
47 * 00: physical pointer to an array of struct ring_desc
48 * 08: ring tail (set by NHI)
49 * 10: ring head (index of first non posted descriptor)
50 * 12: descriptor count
52 #define REG_TX_RING_BASE 0x00000
55 * 16 bytes per entry, one entry for every hop (REG_HOP_COUNT)
56 * 00: physical pointer to an array of struct ring_desc
57 * 08: ring head (index of first not posted descriptor)
58 * 10: ring tail (set by NHI)
59 * 12: descriptor count
60 * 14: max frame sizes (anything larger than 0x100 has no effect)
62 #define REG_RX_RING_BASE 0x08000
65 * 32 bytes per entry, one entry for every hop (REG_HOP_COUNT)
67 * 04: isoch time stamp ?? (write 0)
70 #define REG_TX_OPTIONS_BASE 0x19800
73 * 32 bytes per entry, one entry for every hop (REG_HOP_COUNT)
75 * If RING_FLAG_E2E_FLOW_CONTROL is set then bits 13-23 must be set to
76 * the corresponding TX hop id.
77 * 04: EOF/SOF mask (ignored for RING_FLAG_RAW rings)
80 #define REG_RX_OPTIONS_BASE 0x29800
83 * three bitfields: tx, rx, rx overflow
84 * Every bitfield contains one bit for every hop (REG_HOP_COUNT). Registers are
85 * cleared on read. New interrupts are fired only after ALL registers have been
86 * read (even those containing only disabled rings).
88 #define REG_RING_NOTIFY_BASE 0x37800
89 #define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32)
92 * two bitfields: rx, tx
93 * Both bitfields contains one bit for every hop (REG_HOP_COUNT). To
94 * enable/disable interrupts set/clear the corresponding bits.
96 #define REG_RING_INTERRUPT_BASE 0x38200
97 #define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
99 /* Interrupt Vector Allocation */
100 #define REG_INT_VEC_ALLOC_BASE 0x38c40
101 #define REG_INT_VEC_ALLOC_BITS 4
102 #define REG_INT_VEC_ALLOC_MASK GENMASK(3, 0)
103 #define REG_INT_VEC_ALLOC_REGS (32 / REG_INT_VEC_ALLOC_BITS)
105 /* The last 11 bits contain the number of hops supported by the NHI port. */
106 #define REG_HOP_COUNT 0x39640
108 #define REG_DMA_MISC 0x39864
109 #define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2)
111 #define REG_INMAIL_DATA 0x39900
113 #define REG_INMAIL_CMD 0x39904
114 #define REG_INMAIL_CMD_MASK GENMASK(7, 0)
115 #define REG_INMAIL_ERROR BIT(30)
116 #define REG_INMAIL_OP_REQUEST BIT(31)
118 #define REG_OUTMAIL_CMD 0x3990c
119 #define REG_OUTMAIL_CMD_OPMODE_SHIFT 8
120 #define REG_OUTMAIL_CMD_OPMODE_MASK GENMASK(11, 8)
122 #define REG_FW_STS 0x39944
123 #define REG_FW_STS_NVM_AUTH_DONE BIT(31)
124 #define REG_FW_STS_CIO_RESET_REQ BIT(30)
125 #define REG_FW_STS_ICM_EN_CPU BIT(2)
126 #define REG_FW_STS_ICM_EN_INVERT BIT(1)
127 #define REG_FW_STS_ICM_EN BIT(0)