/*
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* Thunderbolt Cactus Ridge driver - NHI registers
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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*/
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#ifndef DSL3510_REGS_H_
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#define DSL3510_REGS_H_
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#include <linux/types.h>
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enum ring_flags {
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RING_FLAG_ISOCH_ENABLE = 1 << 27, /* TX only? */
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RING_FLAG_E2E_FLOW_CONTROL = 1 << 28,
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RING_FLAG_PCI_NO_SNOOP = 1 << 29,
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RING_FLAG_RAW = 1 << 30, /* ignore EOF/SOF mask, include checksum */
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RING_FLAG_ENABLE = 1 << 31,
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};
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enum ring_desc_flags {
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RING_DESC_ISOCH = 0x1, /* TX only? */
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RING_DESC_COMPLETED = 0x2, /* set by NHI */
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RING_DESC_POSTED = 0x4, /* always set this */
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RING_DESC_INTERRUPT = 0x8, /* request an interrupt on completion */
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};
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/**
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* struct ring_desc - TX/RX ring entry
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*
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* For TX set length/eof/sof.
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* For RX length/eof/sof are set by the NHI.
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*/
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struct ring_desc {
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u64 phys;
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u32 length:12;
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u32 eof:4;
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u32 sof:4;
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enum ring_desc_flags flags:12;
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u32 time; /* write zero */
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} __packed;
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/* NHI registers in bar 0 */
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/*
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* 16 bytes per entry, one entry for every hop (REG_HOP_COUNT)
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* 00: physical pointer to an array of struct ring_desc
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* 08: ring tail (set by NHI)
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* 10: ring head (index of first non posted descriptor)
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* 12: descriptor count
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*/
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#define REG_TX_RING_BASE 0x00000
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/*
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* 16 bytes per entry, one entry for every hop (REG_HOP_COUNT)
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* 00: physical pointer to an array of struct ring_desc
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* 08: ring head (index of first not posted descriptor)
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* 10: ring tail (set by NHI)
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* 12: descriptor count
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* 14: max frame sizes (anything larger than 0x100 has no effect)
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*/
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#define REG_RX_RING_BASE 0x08000
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/*
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* 32 bytes per entry, one entry for every hop (REG_HOP_COUNT)
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* 00: enum_ring_flags
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* 04: isoch time stamp ?? (write 0)
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* ..: unknown
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*/
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#define REG_TX_OPTIONS_BASE 0x19800
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/*
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* 32 bytes per entry, one entry for every hop (REG_HOP_COUNT)
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* 00: enum ring_flags
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* If RING_FLAG_E2E_FLOW_CONTROL is set then bits 13-23 must be set to
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* the corresponding TX hop id.
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* 04: EOF/SOF mask (ignored for RING_FLAG_RAW rings)
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* ..: unknown
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*/
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#define REG_RX_OPTIONS_BASE 0x29800
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/*
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* three bitfields: tx, rx, rx overflow
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* Every bitfield contains one bit for every hop (REG_HOP_COUNT). Registers are
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* cleared on read. New interrupts are fired only after ALL registers have been
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* read (even those containing only disabled rings).
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*/
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#define REG_RING_NOTIFY_BASE 0x37800
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#define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32)
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/*
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* two bitfields: rx, tx
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* Both bitfields contains one bit for every hop (REG_HOP_COUNT). To
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* enable/disable interrupts set/clear the corresponding bits.
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*/
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#define REG_RING_INTERRUPT_BASE 0x38200
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#define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
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/* The last 11 bits contain the number of hops supported by the NHI port. */
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#define REG_HOP_COUNT 0x39640
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#endif
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