2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2016 Michael Zhilin <mizhka@gmail.com>
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8 * modification, are permitted provided that the following conditions
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12 * without modification.
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14 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
15 * redistribution must be conditioned upon including a substantially
16 * similar Disclaimer requirement for further binary redistribution.
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36 #ifndef _BHND_CORES_CHIPC_CHIPC_SPI_H_
37 #define _BHND_CORES_CHIPC_CHIPC_SPI_H_
39 #define CHIPC_SPI_MAXTRIES 1000
41 #define CHIPC_SPI_ACTION_INPUT 1
42 #define CHIPC_SPI_ACTION_OUTPUT 2
44 #define CHIPC_SPI_FLASHCTL 0x00
45 #define CHIPC_SPI_FLASHCTL_OPCODE 0x000000ff
46 #define CHIPC_SPI_FLASHCTL_ACTION 0x00000700 //
48 * We don't use action at all. Experimentaly found, that
49 * action 0 - read current MISO byte to data register (interactive mode)
50 * action 1 = read 2nd byte to data register
51 * action 2 = read 4th byte to data register (surprise! see action 6)
52 * action 3 = read 5th byte to data register
53 * action 4 = read bytes 5-8 to data register in swapped order
54 * action 5 = read bytes 9-12 to data register in swapped order
55 * action 6 = read 3rd byte to data register
56 * action 7 = read bytes 6-9 to data register in swapped order
57 * It may be wrong if CS bit is 1.
58 * If CS bit is 1, you should write cmd / data to opcode byte-to-byte.
60 #define CHIPC_SPI_FLASHCTL_CSACTIVE 0x00001000
61 #define CHIPC_SPI_FLASHCTL_START 0x80000000 //same as BUSY
62 #define CHIPC_SPI_FLASHCTL_BUSY 0x80000000 //same as BUSY
63 #define CHIPC_SPI_FLASHADDR 0x04
64 #define CHIPC_SPI_FLASHDATA 0x08
66 struct chipc_spi_softc {
68 struct resource *sc_res; /**< SPI registers */
71 struct resource *sc_flash_res; /**< flash shadow */
75 /* register space access macros */
76 #define SPI_BARRIER_WRITE(sc) bus_barrier((sc)->sc_res, 0, 0, \
77 BUS_SPACE_BARRIER_WRITE)
78 #define SPI_BARRIER_READ(sc) bus_barrier((sc)->sc_res, 0, 0, \
79 BUS_SPACE_BARRIER_READ)
80 #define SPI_BARRIER_RW(sc) bus_barrier((sc)->sc_res, 0, 0, \
81 BUS_SPACE_BARRIER_READ | \
82 BUS_SPACE_BARRIER_WRITE)
84 #define SPI_WRITE(sc, reg, val) bus_write_4(sc->sc_res, (reg), (val));
86 #define SPI_READ(sc, reg) bus_read_4(sc->sc_res, (reg))
88 #define SPI_SET_BITS(sc, reg, bits) \
89 SPI_WRITE(sc, reg, SPI_READ(sc, (reg)) | (bits))
91 #define SPI_CLEAR_BITS(sc, reg, bits) \
92 SPI_WRITE(sc, reg, SPI_READ(sc, (reg)) & ~(bits))
94 #endif /* _BHND_CORES_CHIPC_CHIPC_SPI_H_ */