spivar.h revision 1.25
1 /* $NetBSD: spivar.h,v 1.25 2025/09/14 16:00:04 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/device.h> 48 #include <sys/queue.h> 49 50 /* 51 * Serial Peripheral Interface bus. This is a 4-wire bus common for 52 * connecting flash, clocks, sensors, and various other low-speed 53 * peripherals. 54 */ 55 56 struct spi_handle; 57 struct spi_transfer; 58 59 typedef struct spi_handle *spi_handle_t; 60 61 #define SPI_MODE_CPHA __BIT(0) 62 #define SPI_MODE_CPOL __BIT(1) 63 64 /* 65 * De facto standard latching modes. 66 */ 67 #define SPI_MODE_0 0 68 #define SPI_MODE_1 SPI_MODE_CPHA 69 #define SPI_MODE_2 SPI_MODE_CPOL 70 #define SPI_MODE_3 (SPI_MODE_CPHA | SPI_MODE_CPOL) 71 72 /* Philips' Microwire is just Mode 0 */ 73 #define SPI_MODE_MICROWIRE SPI_MODE_0 74 75 /* SPI transfer speed helper macros -- converts to Hz for spi_configure(). */ 76 #define SPI_FREQ_kHz(x) ((x) * 1000) 77 #define SPI_FREQ_MHz(x) ((x) * 1000000) 78 79 /* Additional transfer mode flags. */ 80 #define SPI_F_3WIRE __BIT(0) /* requires 3-wire mode */ 81 #define SPI_F_CS_HIGH __BIT(1) /* chip select is active-high */ 82 #define SPI_F_LSB __BIT(2) /* transfer LSB first */ 83 84 struct spi_controller { 85 void *sct_cookie; /* controller private data */ 86 int sct_nslaves; 87 int (*sct_configure)(void *, int, int, int); 88 int (*sct_transfer)(void *, struct spi_transfer *); 89 }; 90 91 int spibus_print(void *, const char *); 92 93 struct spibus_attach_args { 94 const struct spi_controller *sba_controller; 95 }; 96 97 struct spi_attach_args { 98 spi_handle_t sa_handle; 99 100 /* only set if using direct config */ 101 const char *sa_name; /* name of the device */ 102 const char *sa_clist; /* compatible strlist */ 103 size_t sa_clist_size; /* size of compatible strlist */ 104 devhandle_t sa_devhandle; /* device handle for the device */ 105 }; 106 107 /* 108 * This is similar in some respects to struct buf, but we cannot use 109 * that structure because it was not designed to support full-duplex 110 * IO. 111 */ 112 struct spi_chunk { 113 struct spi_chunk *chunk_next; 114 int chunk_count; 115 uint8_t *chunk_read; 116 const uint8_t *chunk_write; 117 /* for private use by framework and bus driver */ 118 uint8_t *chunk_rptr; 119 const uint8_t *chunk_wptr; 120 int chunk_rresid; 121 int chunk_wresid; 122 }; 123 124 struct spi_transfer { 125 struct spi_chunk *st_chunks; /* chained bufs */ 126 SIMPLEQ_ENTRY(spi_transfer) st_chain; /* chain of submitted jobs */ 127 volatile int st_flags; 128 int st_errno; 129 int st_slave; 130 void *st_private; 131 void (*st_done)(struct spi_transfer *); 132 kmutex_t st_lock; 133 kcondvar_t st_cv; 134 void *st_busprivate; 135 void *st_spiprivate; 136 }; 137 138 /* declare a list of transfers */ 139 SIMPLEQ_HEAD(spi_transq, spi_transfer); 140 141 #define spi_transq_init(q) \ 142 SIMPLEQ_INIT(q) 143 144 #define spi_transq_enqueue(q, trans) \ 145 SIMPLEQ_INSERT_TAIL(q, trans, st_chain) 146 147 #define spi_transq_dequeue(q) \ 148 SIMPLEQ_REMOVE_HEAD(q, st_chain) 149 150 #define spi_transq_first(q) \ 151 SIMPLEQ_FIRST(q) 152 153 #define SPI_F_DONE 0x0001 154 #define SPI_F_ERROR 0x0002 155 156 static inline device_t 157 spibus_attach(device_t dev, const struct spi_controller *sct) 158 { 159 struct spibus_attach_args sba = { 160 .sba_controller = sct, 161 }; 162 return config_found(dev, &sba, spibus_print, 163 CFARGS(.iattr = "spibus", 164 .devhandle = device_handle(dev))); 165 } 166 167 /* 168 * Constants to indicate the quality of a match made by a driver's 169 * match routine, from lowest to highest: 170 * 171 * -- Default indirect match; rely on kernel config file. 172 * 173 * -- Direct-config match by "compatible" string. 174 */ 175 #define SPI_MATCH_DEFAULT 1 176 #define SPI_MATCH_DIRECT_COMPATIBLE 10 /* ...and up */ 177 178 bool spi_use_direct_match(const struct spi_attach_args *, 179 const struct device_compatible_entry *, int *); 180 int spi_compatible_match(const struct spi_attach_args *, 181 const struct device_compatible_entry *); 182 const struct device_compatible_entry * 183 spi_compatible_lookup(const struct spi_attach_args *, 184 const struct device_compatible_entry *); 185 186 int spi_configure(device_t, spi_handle_t, int, int); 187 int spi_transfer(spi_handle_t, struct spi_transfer *); 188 void spi_transfer_init(struct spi_transfer *); 189 void spi_chunk_init(struct spi_chunk *, int, const uint8_t *, uint8_t *); 190 void spi_transfer_add(struct spi_transfer *, struct spi_chunk *); 191 void spi_wait(struct spi_transfer *); 192 void spi_done(struct spi_transfer *, int); 193 194 /* convenience wrappers */ 195 int spi_send(spi_handle_t, int, const uint8_t *); 196 int spi_recv(spi_handle_t, int, uint8_t *); 197 int spi_send_recv(spi_handle_t, int, const uint8_t *, int, uint8_t *); 198 199 #endif /* _DEV_SPI_SPIVAR_H_ */ 200
Indexes created Mon Sep 29 21:09:56 GMT 2025