1 /* 2 * Thunderbolt Cactus Ridge driver - NHI registers 3 * 4 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> 5 */ 6 7 #ifndef DSL3510_REGS_H_ 8 #define DSL3510_REGS_H_ 9 10 #include <linux/types.h> 11 12 enum ring_flags { 13 RING_FLAG_ISOCH_ENABLE = 1 << 27, /* TX only? */ 14 RING_FLAG_E2E_FLOW_CONTROL = 1 << 28, 15 RING_FLAG_PCI_NO_SNOOP = 1 << 29, 16 RING_FLAG_RAW = 1 << 30, /* ignore EOF/SOF mask, include checksum */ 17 RING_FLAG_ENABLE = 1 << 31, 18 }; 19 20 enum ring_desc_flags { 21 RING_DESC_ISOCH = 0x1, /* TX only? */ 22 RING_DESC_COMPLETED = 0x2, /* set by NHI */ 23 RING_DESC_POSTED = 0x4, /* always set this */ 24 RING_DESC_INTERRUPT = 0x8, /* request an interrupt on completion */ 25 }; 26 27 /** 28 * struct ring_desc - TX/RX ring entry 29 * 30 * For TX set length/eof/sof. 31 * For RX length/eof/sof are set by the NHI. 32 */ 33 struct ring_desc { 34 u64 phys; 35 u32 length:12; 36 u32 eof:4; 37 u32 sof:4; 38 enum ring_desc_flags flags:12; 39 u32 time; /* write zero */ 40 } __packed; 41 42 /* NHI registers in bar 0 */ 43 44 /* 45 * 16 bytes per entry, one entry for every hop (REG_HOP_COUNT) 46 * 00: physical pointer to an array of struct ring_desc 47 * 08: ring tail (set by NHI) 48 * 10: ring head (index of first non posted descriptor) 49 * 12: descriptor count 50 */ 51 #define REG_TX_RING_BASE 0x00000 52 53 /* 54 * 16 bytes per entry, one entry for every hop (REG_HOP_COUNT) 55 * 00: physical pointer to an array of struct ring_desc 56 * 08: ring head (index of first not posted descriptor) 57 * 10: ring tail (set by NHI) 58 * 12: descriptor count 59 * 14: max frame sizes (anything larger than 0x100 has no effect) 60 */ 61 #define REG_RX_RING_BASE 0x08000 62 63 /* 64 * 32 bytes per entry, one entry for every hop (REG_HOP_COUNT) 65 * 00: enum_ring_flags 66 * 04: isoch time stamp ?? (write 0) 67 * ..: unknown 68 */ 69 #define REG_TX_OPTIONS_BASE 0x19800 70 71 /* 72 * 32 bytes per entry, one entry for every hop (REG_HOP_COUNT) 73 * 00: enum ring_flags 74 * If RING_FLAG_E2E_FLOW_CONTROL is set then bits 13-23 must be set to 75 * the corresponding TX hop id. 76 * 04: EOF/SOF mask (ignored for RING_FLAG_RAW rings) 77 * ..: unknown 78 */ 79 #define REG_RX_OPTIONS_BASE 0x29800 80 81 /* 82 * three bitfields: tx, rx, rx overflow 83 * Every bitfield contains one bit for every hop (REG_HOP_COUNT). Registers are 84 * cleared on read. New interrupts are fired only after ALL registers have been 85 * read (even those containing only disabled rings). 86 */ 87 #define REG_RING_NOTIFY_BASE 0x37800 88 #define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32) 89 90 /* 91 * two bitfields: rx, tx 92 * Both bitfields contains one bit for every hop (REG_HOP_COUNT). To 93 * enable/disable interrupts set/clear the corresponding bits. 94 */ 95 #define REG_RING_INTERRUPT_BASE 0x38200 96 #define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32) 97 98 /* The last 11 bits contain the number of hops supported by the NHI port. */ 99 #define REG_HOP_COUNT 0x39640 100 101 #endif 102