armadillo9_iic.c revision 1.1
1 /* $NetBSD: armadillo9_iic.c,v 1.1 2005/11/13 06:33:05 hamajima Exp $ */ 2 3 /* 4 * Copyright (c) 2005 HAMAJIMA Katsuomi. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: armadillo9_iic.c,v 1.1 2005/11/13 06:33:05 hamajima Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/device.h> 35 #include <sys/lock.h> 36 #include <dev/i2c/i2cvar.h> 37 #include <dev/i2c/i2c_bitbang.h> 38 #include <arm/ep93xx/epsocvar.h> 39 #include <arm/ep93xx/epgpiovar.h> 40 41 #include "seeprom.h" 42 #if NSEEPROM > 0 43 #include <net/if.h> 44 #include <net/if_ether.h> 45 #include <dev/i2c/at24cxxvar.h> 46 #endif 47 48 struct armadillo9iic_softc { 49 struct device sc_dev; 50 struct i2c_controller sc_i2c; 51 struct lock sc_buslock; 52 int sc_port; 53 int sc_sda; 54 int sc_scl; 55 struct epgpio_softc *sc_gpio; 56 }; 57 58 static int armadillo9iic_match(struct device *, struct cfdata *, void *); 59 static void armadillo9iic_attach(struct device *, struct device *, void *); 60 61 static int armadillo9iic_acquire_bus(void *, int); 62 static void armadillo9iic_release_bus(void *, int); 63 static int armadillo9iic_send_start(void *, int); 64 static int armadillo9iic_send_stop(void *, int); 65 static int armadillo9iic_initiate_xfer(void *, uint16_t, int); 66 static int armadillo9iic_read_byte(void *, uint8_t *, int); 67 static int armadillo9iic_write_byte(void *, uint8_t, int); 68 69 static void armadillo9iic_bb_set_bits(void *, uint32_t); 70 static void armadillo9iic_bb_set_dir(void *, uint32_t); 71 static uint32_t armadillo9iic_bb_read_bits(void *); 72 73 CFATTACH_DECL(armadillo9iic, sizeof(struct armadillo9iic_softc), 74 armadillo9iic_match, armadillo9iic_attach, NULL, NULL); 75 76 static struct i2c_bitbang_ops armadillo9iic_bbops = { 77 armadillo9iic_bb_set_bits, 78 armadillo9iic_bb_set_dir, 79 armadillo9iic_bb_read_bits, 80 { 0, 0, 0, 0 } /* set in attach() */ 81 }; 82 83 int 84 armadillo9iic_match(struct device *parent, struct cfdata *cf, void *aux) 85 { 86 return 2; 87 } 88 89 void 90 armadillo9iic_attach(struct device *parent, struct device *self, void *aux) 91 { 92 struct armadillo9iic_softc *sc = (struct armadillo9iic_softc*)self; 93 struct i2cbus_attach_args iba; 94 #if NSEEPROM > 0 95 struct epgpio_attach_args *ga = aux; 96 u_int8_t enaddr[ETHER_ADDR_LEN]; 97 #endif 98 lockinit(&sc->sc_buslock, PRIBIO|PCATCH, "armadillo9iiclk", 0, 0); 99 100 sc->sc_port = ga->ga_port; 101 sc->sc_sda = ga->ga_bit1; 102 sc->sc_scl = ga->ga_bit2; 103 sc->sc_gpio = (struct epgpio_softc *)parent; 104 105 armadillo9iic_bbops.ibo_bits[I2C_BIT_SDA] = (1<<sc->sc_sda); 106 armadillo9iic_bbops.ibo_bits[I2C_BIT_SCL] = (1<<sc->sc_scl); 107 armadillo9iic_bbops.ibo_bits[I2C_BIT_OUTPUT] = sc->sc_sda; 108 armadillo9iic_bbops.ibo_bits[I2C_BIT_INPUT] = 0; 109 110 sc->sc_i2c.ic_cookie = sc; 111 sc->sc_i2c.ic_acquire_bus = armadillo9iic_acquire_bus; 112 sc->sc_i2c.ic_release_bus = armadillo9iic_release_bus; 113 sc->sc_i2c.ic_send_start = armadillo9iic_send_start; 114 sc->sc_i2c.ic_send_stop = armadillo9iic_send_stop; 115 sc->sc_i2c.ic_initiate_xfer = armadillo9iic_initiate_xfer; 116 sc->sc_i2c.ic_read_byte = armadillo9iic_read_byte; 117 sc->sc_i2c.ic_write_byte = armadillo9iic_write_byte; 118 119 iba.iba_name = "iic"; 120 iba.iba_tag = &sc->sc_i2c; 121 122 epgpio_in(sc->sc_gpio, sc->sc_port, sc->sc_sda); 123 epgpio_out(sc->sc_gpio, sc->sc_port, sc->sc_scl); 124 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_scl); 125 126 printf("\n"); 127 128 config_found(&sc->sc_dev, &iba, iicbus_print); 129 130 #if NSEEPROM > 0 131 /* read and set mac address */ 132 if (!seeprom_bootstrap_read(&sc->sc_i2c, 0x50, 0x00, 128, 133 (uint8_t *)enaddr, ETHER_ADDR_LEN) 134 && (prop_set(dev_propdb, 0, "mac-addr", 135 enaddr, ETHER_ADDR_LEN, PROP_ARRAY, 0) != 0)) { 136 printf("WARNING: unable to set mac-addr property for %s\n", 137 sc->sc_dev.dv_xname); 138 } 139 #endif 140 } 141 142 int 143 armadillo9iic_acquire_bus(void *cookie, int flags) 144 { 145 struct armadillo9iic_softc *sc = cookie; 146 147 /* XXX What should we do for the polling case? */ 148 if (flags & I2C_F_POLL) 149 return 0; 150 151 return lockmgr(&sc->sc_buslock, LK_EXCLUSIVE, NULL); 152 } 153 154 void 155 armadillo9iic_release_bus(void *cookie, int flags) 156 { 157 struct armadillo9iic_softc *sc = cookie; 158 159 /* XXX See above. */ 160 if (flags & I2C_F_POLL) 161 return; 162 163 lockmgr(&sc->sc_buslock, LK_RELEASE, NULL); 164 } 165 166 int 167 armadillo9iic_send_start(void *cookie, int flags) 168 { 169 return i2c_bitbang_send_start(cookie, flags, &armadillo9iic_bbops); 170 } 171 172 int 173 armadillo9iic_send_stop(void *cookie, int flags) 174 { 175 return i2c_bitbang_send_stop(cookie, flags, &armadillo9iic_bbops); 176 } 177 178 int 179 armadillo9iic_initiate_xfer(void *cookie, i2c_addr_t addr, int flags) 180 { 181 return i2c_bitbang_initiate_xfer(cookie, addr, flags, 182 &armadillo9iic_bbops); 183 } 184 185 int 186 armadillo9iic_read_byte(void *cookie, uint8_t *bytep, int flags) 187 { 188 return i2c_bitbang_read_byte(cookie, bytep, flags, 189 &armadillo9iic_bbops); 190 } 191 192 int 193 armadillo9iic_write_byte(void *cookie, uint8_t byte, int flags) 194 { 195 return i2c_bitbang_write_byte(cookie, byte, flags, 196 &armadillo9iic_bbops); 197 } 198 199 void 200 armadillo9iic_bb_set_bits(void *cookie, uint32_t bits) 201 { 202 struct armadillo9iic_softc *sc = cookie; 203 204 if (bits & (1 << sc->sc_sda)) 205 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_sda); 206 else 207 epgpio_clear(sc->sc_gpio, sc->sc_port, sc->sc_sda); 208 209 if (bits & (1 << sc->sc_scl)) 210 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_scl); 211 else 212 epgpio_clear(sc->sc_gpio, sc->sc_port, sc->sc_scl); 213 } 214 215 void 216 armadillo9iic_bb_set_dir(void *cookie, uint32_t bits) 217 { 218 struct armadillo9iic_softc *sc = cookie; 219 220 if(bits) 221 epgpio_out(sc->sc_gpio, sc->sc_port, sc->sc_sda); 222 else 223 epgpio_in(sc->sc_gpio, sc->sc_port, sc->sc_sda); 224 } 225 226 uint32_t 227 armadillo9iic_bb_read_bits(void *cookie) 228 { 229 struct armadillo9iic_softc *sc = cookie; 230 231 return epgpio_read(sc->sc_gpio, sc->sc_port, sc->sc_sda) << sc->sc_sda; 232 } 233
Indexes created Thu Oct 02 01:09:59 GMT 2025