diff options
Diffstat (limited to 'drivers/thunderbolt/nhi_regs.h')
| -rw-r--r-- | drivers/thunderbolt/nhi_regs.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h new file mode 100644 index 000000000..b3e49d19c --- /dev/null +++ b/drivers/thunderbolt/nhi_regs.h @@ -0,0 +1,126 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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, +}; + +/** + * 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 +#define REG_RX_OPTIONS_E2E_HOP_MASK GENMASK(22, 12) +#define REG_RX_OPTIONS_E2E_HOP_SHIFT 12 + +/* + * 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) + +#define REG_INT_THROTTLING_RATE 0x38c00 + +/* 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) + +#define REG_INMAIL_DATA 0x39900 + +#define REG_INMAIL_CMD 0x39904 +#define REG_INMAIL_CMD_MASK GENMASK(7, 0) +#define REG_INMAIL_ERROR BIT(30) +#define REG_INMAIL_OP_REQUEST BIT(31) + +#define REG_OUTMAIL_CMD 0x3990c +#define REG_OUTMAIL_CMD_OPMODE_SHIFT 8 +#define REG_OUTMAIL_CMD_OPMODE_MASK GENMASK(11, 8) + +#define REG_FW_STS 0x39944 +#define REG_FW_STS_NVM_AUTH_DONE BIT(31) +#define REG_FW_STS_CIO_RESET_REQ BIT(30) +#define REG_FW_STS_ICM_EN_CPU BIT(2) +#define REG_FW_STS_ICM_EN_INVERT BIT(1) +#define REG_FW_STS_ICM_EN BIT(0) + +#endif |