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/*
* Thunderbolt driver - NHI registers
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
*/
#ifndef NHI_REGS_H_
#define NHI_REGS_H_
#include <linux/types.h>
enum ring_flags {
RING_FLAG_ISOCH_ENABLE = 1 << 27, /* TX only? */
RING_FLAG_E2E_FLOW_CONTROL = 1 << 28,
RING_FLAG_PCI_NO_SNOOP = 1 << 29,
RING_FLAG_RAW = 1 << 30, /* ignore EOF/SOF mask, include checksum */
RING_FLAG_ENABLE = 1 << 31,
};
enum ring_desc_flags {
RING_DESC_ISOCH = 0x1, /* TX only? */
RING_DESC_COMPLETED = 0x2, /* set by NHI */
RING_DESC_POSTED = 0x4, /* always set this */
RING_DESC_INTERRUPT = 0x8, /* request an interrupt on completion */
};
/**
* struct ring_desc - TX/RX ring entry
*
* For TX set length/eof/sof.
* For RX length/eof/sof are set by the NHI.
*/
struct ring_desc {
u64 phys;
u32 length:12;
u32 eof:4;
u32 sof:4;
enum ring_desc_flags flags:12;
u32 time; /* write zero */
} __packed;
/* NHI registers in bar 0 */
/*
* 16 bytes per entry, one entry for every hop (REG_HOP_COUNT)
* 00: physical pointer to an array of struct ring_desc
* 08: ring tail (set by NHI)
* 10: ring head (index of first non posted descriptor)
* 12: descriptor count
*/
#define REG_TX_RING_BASE 0x00000
/*
* 16 bytes per entry, one entry for every hop (REG_HOP_COUNT)
* 00: physical pointer to an array of struct ring_desc
* 08: ring head (index of first not posted descriptor)
* 10: ring tail (set by NHI)
* 12: descriptor count
* 14: max frame sizes (anything larger than 0x100 has no effect)
*/
#define REG_RX_RING_BASE 0x08000
/*
* 32 bytes per entry, one entry for every hop (REG_HOP_COUNT)
* 00: enum_ring_flags
* 04: isoch time stamp ?? (write 0)
* ..: unknown
*/
#define REG_TX_OPTIONS_BASE 0x19800
/*
* 32 bytes per entry, one entry for every hop (REG_HOP_COUNT)
* 00: enum ring_flags
* If RING_FLAG_E2E_FLOW_CONTROL is set then bits 13-23 must be set to
* the corresponding TX hop id.
* 04: EOF/SOF mask (ignored for RING_FLAG_RAW rings)
* ..: unknown
*/
#define REG_RX_OPTIONS_BASE 0x29800
/*
* three bitfields: tx, rx, rx overflow
* Every bitfield contains one bit for every hop (REG_HOP_COUNT). Registers are
* cleared on read. New interrupts are fired only after ALL registers have been
* read (even those containing only disabled rings).
*/
#define REG_RING_NOTIFY_BASE 0x37800
#define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32)
/*
* two bitfields: rx, tx
* Both bitfields contains one bit for every hop (REG_HOP_COUNT). To
* enable/disable interrupts set/clear the corresponding bits.
*/
#define REG_RING_INTERRUPT_BASE 0x38200
#define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
/* Interrupt Vector Allocation */
#define REG_INT_VEC_ALLOC_BASE 0x38c40
#define REG_INT_VEC_ALLOC_BITS 4
#define REG_INT_VEC_ALLOC_MASK GENMASK(3, 0)
#define REG_INT_VEC_ALLOC_REGS (32 / REG_INT_VEC_ALLOC_BITS)
/* The last 11 bits contain the number of hops supported by the NHI port. */
#define REG_HOP_COUNT 0x39640
#define REG_DMA_MISC 0x39864
#define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2)
#endif
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