armadillo9_iic.c revision 1.11
1/* $NetBSD: armadillo9_iic.c,v 1.11 2021/08/07 16:18:49 thorpej 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 1.11 2021/08/07 16:18:49 thorpej 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/mutex.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#include <evbarm/armadillo/armadillo9var.h> 41 42#include "seeprom.h" 43#if NSEEPROM > 0 44#include <net/if.h> 45#include <net/if_ether.h> 46#include <dev/i2c/at24cxxvar.h> 47#endif 48 49struct armadillo9iic_softc { 50 struct i2c_controller sc_i2c; 51 int sc_port; 52 int sc_sda; 53 int sc_scl; 54 struct epgpio_softc *sc_gpio; 55}; 56 57static int armadillo9iic_match(device_t, cfdata_t, void *); 58static void armadillo9iic_attach(device_t, device_t, void *); 59 60static int armadillo9iic_send_start(void *, int); 61static int armadillo9iic_send_stop(void *, int); 62static int armadillo9iic_initiate_xfer(void *, uint16_t, int); 63static int armadillo9iic_read_byte(void *, uint8_t *, int); 64static int armadillo9iic_write_byte(void *, uint8_t, int); 65 66static void armadillo9iic_bb_set_bits(void *, uint32_t); 67static void armadillo9iic_bb_set_dir(void *, uint32_t); 68static uint32_t armadillo9iic_bb_read_bits(void *); 69 70CFATTACH_DECL_NEW(armadillo9iic, sizeof(struct armadillo9iic_softc), 71 armadillo9iic_match, armadillo9iic_attach, NULL, NULL); 72 73static struct i2c_bitbang_ops armadillo9iic_bbops = { 74 armadillo9iic_bb_set_bits, 75 armadillo9iic_bb_set_dir, 76 armadillo9iic_bb_read_bits, 77 { 0, 0, 0, 0 } /* set in attach() */ 78}; 79 80int 81armadillo9iic_match(device_t parent, cfdata_t cf, void *aux) 82{ 83 return 2; 84} 85 86void 87armadillo9iic_attach(device_t parent, device_t self, void *aux) 88{ 89 struct armadillo9iic_softc *sc = device_private(self); 90 struct i2cbus_attach_args iba; 91#if NSEEPROM > 0 92 struct epgpio_attach_args *ga = aux; 93#endif 94 95 sc->sc_port = ga->ga_port; 96 sc->sc_sda = ga->ga_bit1; 97 sc->sc_scl = ga->ga_bit2; 98 sc->sc_gpio = (struct epgpio_softc *)parent; 99 100 armadillo9iic_bbops.ibo_bits[I2C_BIT_SDA] = (1<<sc->sc_sda); 101 armadillo9iic_bbops.ibo_bits[I2C_BIT_SCL] = (1<<sc->sc_scl); 102 armadillo9iic_bbops.ibo_bits[I2C_BIT_OUTPUT] = sc->sc_sda; 103 armadillo9iic_bbops.ibo_bits[I2C_BIT_INPUT] = 0; 104 105 iic_tag_init(&sc->sc_i2c); 106 sc->sc_i2c.ic_cookie = sc; 107 sc->sc_i2c.ic_send_start = armadillo9iic_send_start; 108 sc->sc_i2c.ic_send_stop = armadillo9iic_send_stop; 109 sc->sc_i2c.ic_initiate_xfer = armadillo9iic_initiate_xfer; 110 sc->sc_i2c.ic_read_byte = armadillo9iic_read_byte; 111 sc->sc_i2c.ic_write_byte = armadillo9iic_write_byte; 112 113 memset(&iba, 0, sizeof(iba)); 114 iba.iba_tag = &sc->sc_i2c; 115 116 epgpio_in(sc->sc_gpio, sc->sc_port, sc->sc_sda); 117 epgpio_out(sc->sc_gpio, sc->sc_port, sc->sc_scl); 118 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_scl); 119 120 printf("\n"); 121 122 config_found(self, &iba, iicbus_print, CFARGS_NONE); 123 124#if NSEEPROM > 0 125 /* read mac address */ 126 /* XXX This should probably be done elsewhere, earlier in bootstrap. */ 127 if (seeprom_bootstrap_read(&sc->sc_i2c, 0x50, 0x00, 128, 128 armadillo9_ethaddr, ETHER_ADDR_LEN) != 0) { 129 printf("%s: WARNING: unable to read MAC address from SEEPROM\n", 130 device_xname(self)); 131 } 132#endif 133} 134 135int 136armadillo9iic_send_start(void *cookie, int flags) 137{ 138 return i2c_bitbang_send_start(cookie, flags, &armadillo9iic_bbops); 139} 140 141int 142armadillo9iic_send_stop(void *cookie, int flags) 143{ 144 return i2c_bitbang_send_stop(cookie, flags, &armadillo9iic_bbops); 145} 146 147int 148armadillo9iic_initiate_xfer(void *cookie, i2c_addr_t addr, int flags) 149{ 150 return i2c_bitbang_initiate_xfer(cookie, addr, flags, 151 &armadillo9iic_bbops); 152} 153 154int 155armadillo9iic_read_byte(void *cookie, uint8_t *bytep, int flags) 156{ 157 return i2c_bitbang_read_byte(cookie, bytep, flags, 158 &armadillo9iic_bbops); 159} 160 161int 162armadillo9iic_write_byte(void *cookie, uint8_t byte, int flags) 163{ 164 return i2c_bitbang_write_byte(cookie, byte, flags, 165 &armadillo9iic_bbops); 166} 167 168void 169armadillo9iic_bb_set_bits(void *cookie, uint32_t bits) 170{ 171 struct armadillo9iic_softc *sc = cookie; 172 173 if (bits & (1 << sc->sc_sda)) 174 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_sda); 175 else 176 epgpio_clear(sc->sc_gpio, sc->sc_port, sc->sc_sda); 177 178 if (bits & (1 << sc->sc_scl)) 179 epgpio_set(sc->sc_gpio, sc->sc_port, sc->sc_scl); 180 else 181 epgpio_clear(sc->sc_gpio, sc->sc_port, sc->sc_scl); 182} 183 184void 185armadillo9iic_bb_set_dir(void *cookie, uint32_t bits) 186{ 187 struct armadillo9iic_softc *sc = cookie; 188 189 if(bits) 190 epgpio_out(sc->sc_gpio, sc->sc_port, sc->sc_sda); 191 else 192 epgpio_in(sc->sc_gpio, sc->sc_port, sc->sc_sda); 193} 194 195uint32_t 196armadillo9iic_bb_read_bits(void *cookie) 197{ 198 struct armadillo9iic_softc *sc = cookie; 199 uint32_t bits = 0; 200 201 bits |= epgpio_read(sc->sc_gpio, sc->sc_port, sc->sc_sda) << sc->sc_sda; 202 bits |= epgpio_read(sc->sc_gpio, sc->sc_port, sc->sc_scl) << sc->sc_scl; 203 204 return bits; 205} 206