spivar.h revision 1.21
1 /* $NetBSD: spivar.h,v 1.21 2025/09/11 13:24:11 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 Urbana-Champaign Independent Media Center. 5 * Copyright (c) 2006 Garrett D'Amore. 6 * All rights reserved. 7 * 8 * Portions of this code were written by Garrett D'Amore for the 9 * Champaign-Urbana Community Wireless Network Project. 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer in the documentation and/or other materials provided 19 * with the distribution. 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgements: 22 * This product includes software developed by the Urbana-Champaign 23 * Independent Media Center. 24 * This product includes software developed by Garrett D'Amore. 25 * 4. Urbana-Champaign Independent Media Center's name and Garrett 26 * D'Amore's name may not be used to endorse or promote products 27 * derived from this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT 30 * MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR 31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 32 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT 34 * MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT, 35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 42 */ 43 44 #ifndef _DEV_SPI_SPIVAR_H_ 45 #define _DEV_SPI_SPIVAR_H_ 46 47 #include <sys/queue.h> 48 49 /* 50 * Serial Peripheral Interface bus. This is a 4-wire bus common for 51 * connecting flash, clocks, sensors, and various other low-speed 52 * peripherals. 53 */ 54 55 struct spi_handle; 56 struct spi_transfer; 57 58 #define SPI_MODE_CPHA __BIT(0) 59 #define SPI_MODE_CPOL __BIT(1) 60 61 /* 62 * De facto standard latching modes. 63 */ 64 #define SPI_MODE_0 0 65 #define SPI_MODE_1 SPI_MODE_CPHA 66 #define SPI_MODE_2 SPI_MODE_CPOL 67 #define SPI_MODE_3 (SPI_MODE_CPHA | SPI_MODE_CPOL) 68 69 /* Philips' Microwire is just Mode 0 */ 70 #define SPI_MODE_MICROWIRE SPI_MODE_0 71 72 /* SPI transfer speed helper macros -- converts to Hz for spi_configure(). */ 73 #define SPI_FREQ_kHz(x) ((x) * 1000) 74 #define SPI_FREQ_MHz(x) ((x) * 1000000) 75 76 struct spi_controller { 77 void *sct_cookie; /* controller private data */ 78 int sct_nslaves; 79 int (*sct_configure)(void *, int, int, int); 80 int (*sct_transfer)(void *, struct spi_transfer *); 81 }; 82 83 int spibus_print(void *, const char *); 84 85 /* one per chip select */ 86 struct spibus_attach_args { 87 const struct spi_controller *sba_controller; 88 }; 89 90 struct spi_attach_args { 91 struct spi_handle *sa_handle; 92 /* only set if using direct config */ 93 int sa_ncompat; /* number of pointers in the 94 ia_compat array */ 95 const char ** sa_compat; /* chip names */ 96 }; 97 98 /* 99 * This is similar in some respects to struct buf, but we cannot use 100 * that structure because it was not designed to support full-duplex 101 * IO. 102 */ 103 struct spi_chunk { 104 struct spi_chunk *chunk_next; 105 int chunk_count; 106 uint8_t *chunk_read; 107 const uint8_t *chunk_write; 108 /* for private use by framework and bus driver */ 109 uint8_t *chunk_rptr; 110 const uint8_t *chunk_wptr; 111 int chunk_rresid; 112 int chunk_wresid; 113 }; 114 115 struct spi_transfer { 116 struct spi_chunk *st_chunks; /* chained bufs */ 117 SIMPLEQ_ENTRY(spi_transfer) st_chain; /* chain of submitted jobs */ 118 volatile int st_flags; 119 int st_errno; 120 int st_slave; 121 void *st_private; 122 void (*st_done)(struct spi_transfer *); 123 kmutex_t st_lock; 124 kcondvar_t st_cv; 125 void *st_busprivate; 126 void *st_spiprivate; 127 }; 128 129 /* declare a list of transfers */ 130 SIMPLEQ_HEAD(spi_transq, spi_transfer); 131 132 #define spi_transq_init(q) \ 133 SIMPLEQ_INIT(q) 134 135 #define spi_transq_enqueue(q, trans) \ 136 SIMPLEQ_INSERT_TAIL(q, trans, st_chain) 137 138 #define spi_transq_dequeue(q) \ 139 SIMPLEQ_REMOVE_HEAD(q, st_chain) 140 141 #define spi_transq_first(q) \ 142 SIMPLEQ_FIRST(q) 143 144 #define SPI_F_DONE 0x0001 145 #define SPI_F_ERROR 0x0002 146 147 static inline device_t 148 spibus_attach(device_t dev, const struct spi_controller *sct) 149 { 150 struct spibus_attach_args sba = { 151 .sba_controller = sct, 152 }; 153 return config_found(dev, &sba, spibus_print, 154 CFARGS(.iattr = "spibus", 155 .devhandle = device_handle(dev))); 156 } 157 158 /* 159 * Constants to indicate the quality of a match made by a driver's 160 * match routine, from lowest to highest: 161 * 162 * -- Default indirect match; rely on kernel config file. 163 * 164 * -- Direct-config match by "compatible" string. 165 */ 166 #define SPI_MATCH_DEFAULT 1 167 #define SPI_MATCH_DIRECT_COMPATIBLE 10 /* ...and up */ 168 169 bool spi_use_direct_match(const struct spi_attach_args *, 170 const struct device_compatible_entry *, int *); 171 int spi_compatible_match(const struct spi_attach_args *, const cfdata_t, 172 const struct device_compatible_entry *); 173 const struct device_compatible_entry * 174 spi_compatible_lookup(const struct spi_attach_args *, 175 const struct device_compatible_entry *); 176 int spi_configure(device_t, struct spi_handle *, int, int); 177 int spi_transfer(struct spi_handle *, struct spi_transfer *); 178 void spi_transfer_init(struct spi_transfer *); 179 void spi_chunk_init(struct spi_chunk *, int, const uint8_t *, uint8_t *); 180 void spi_transfer_add(struct spi_transfer *, struct spi_chunk *); 181 void spi_wait(struct spi_transfer *); 182 void spi_done(struct spi_transfer *, int); 183 184 /* convenience wrappers */ 185 int spi_send(struct spi_handle *, int, const uint8_t *); 186 int spi_recv(struct spi_handle *, int, uint8_t *); 187 int spi_send_recv(struct spi_handle *, int, const uint8_t *, int, 188 uint8_t *); 189 190 #endif /* _DEV_SPI_SPIVAR_H_ */ 191
Indexes created Thu Sep 25 16:09:42 GMT 2025