1 /* $NetBSD: pcfiic_ebus.c,v 1.9 2025/09/01 04:47:03 thorpej Exp $ */ 2 /* $OpenBSD: pcfiic_ebus.c,v 1.13 2008/06/08 03:07:40 deraadt Exp $ */ 3 4 /* 5 * Copyright (c) 2006 David Gwynne <dlg (at) openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/cdefs.h> 21 __KERNEL_RCSID(0, "$NetBSD: pcfiic_ebus.c,v 1.9 2025/09/01 04:47:03 thorpej Exp $"); 22 23 /* 24 * Device specific driver for the EBus i2c devices found on some sun4u 25 * systems. On systems not having a boot-bus controller the i2c devices 26 * are PCF8584. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/device.h> 32 #include <sys/kernel.h> 33 #include <sys/rwlock.h> 34 35 #include <sys/bus.h> 36 #include <machine/openfirm.h> 37 #include <machine/autoconf.h> 38 39 #include <dev/ebus/ebusreg.h> 40 #include <dev/ebus/ebusvar.h> 41 42 #include <dev/i2c/i2cvar.h> 43 44 #include <dev/ic/pcf8584var.h> 45 #include <dev/ic/pcf8584reg.h> 46 47 int pcfiic_ebus_match(device_t, struct cfdata *, void *); 48 void pcfiic_ebus_attach(device_t, device_t, void *); 49 50 struct pcfiic_ebus_softc { 51 struct pcfiic_softc esc_sc; 52 53 int esc_node; 54 void *esc_ih; 55 }; 56 57 CFATTACH_DECL_NEW(pcfiic_ebus, sizeof(struct pcfiic_ebus_softc), 58 pcfiic_ebus_match, pcfiic_ebus_attach, NULL, NULL); 59 60 int 61 pcfiic_ebus_match(device_t parent, struct cfdata *match, void *aux) 62 { 63 struct ebus_attach_args *ea = aux; 64 char compat[32]; 65 66 if (strcmp(ea->ea_name, "SUNW,envctrl") == 0 || 67 strcmp(ea->ea_name, "SUNW,envctrltwo") == 0) 68 return (1); 69 70 if (strcmp(ea->ea_name, "i2c") != 0) 71 return (0); 72 73 if (OF_getprop(ea->ea_node, "compatible", compat, sizeof(compat)) == -1) 74 return (0); 75 76 if (strcmp(compat, "pcf8584") == 0 || 77 strcmp(compat, "i2cpcf,8584") == 0 || 78 strcmp(compat, "SUNW,i2c-pic16f747") == 0 || 79 strcmp(compat, "SUNW,bbc-i2c") == 0) 80 return (1); 81 82 return (0); 83 } 84 85 void 86 pcfiic_ebus_attach(device_t parent, device_t self, void *aux) 87 { 88 struct pcfiic_ebus_softc *esc = device_private(self); 89 struct pcfiic_softc *sc = &esc->esc_sc; 90 struct ebus_attach_args *ea = aux; 91 char compat[32]; 92 u_int64_t addr; 93 u_int8_t clock = PCF8584_CLK_12 | PCF8584_SCL_90; 94 int swapregs = 0; 95 96 if (ea->ea_nreg < 1 || ea->ea_nreg > 2) { 97 printf(": expected 1 or 2 registers, got %d\n", ea->ea_nreg); 98 return; 99 } 100 101 /* E450 and E250 have a different clock */ 102 if ((strcmp(ea->ea_name, "SUNW,envctrl") == 0) || 103 (strcmp(ea->ea_name, "SUNW,envctrltwo") == 0)) 104 clock = PCF8584_CLK_12 | PCF8584_SCL_45; 105 106 sc->sc_dev = self; 107 if (OF_getprop(ea->ea_node, "compatible", compat, sizeof(compat)) > 0 && 108 strcmp(compat, "SUNW,bbc-i2c") == 0) { 109 /* 110 * On BBC-based machines, Sun swapped the order of 111 * the registers on their clone pcf, plus they feed 112 * it a non-standard clock. 113 */ 114 int clk = prom_getpropint(findroot(), "clock-frequency", 0); 115 116 if (clk < 105000000) 117 clock = PCF8584_CLK_3 | PCF8584_SCL_90; 118 else if (clk < 160000000) 119 clock = PCF8584_CLK_4_43 | PCF8584_SCL_90; 120 swapregs = 1; 121 } 122 123 if (OF_getprop(ea->ea_node, "own-address", &addr, sizeof(addr)) == -1) { 124 addr = 0xaa; 125 } else if (addr == 0x00 || addr > 0xff) { 126 printf(": invalid address on I2C bus"); 127 return; 128 } 129 130 if (bus_space_map(ea->ea_bustag, 131 EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 132 ea->ea_reg[0].size, 0, &sc->sc_ioh) == 0) { 133 sc->sc_iot = ea->ea_bustag; 134 } else { 135 printf(": can't map register space\n"); 136 return; 137 } 138 139 if (ea->ea_nreg == 2) { 140 /* 141 * Second register only occurs on BBC-based machines, 142 * and is likely not prom mapped 143 */ 144 if (bus_space_map(sc->sc_iot, EBUS_ADDR_FROM_REG(&ea->ea_reg[1]), 145 ea->ea_reg[1].size, 0, &sc->sc_ioh2) != 0) { 146 printf(": can't map 2nd register space\n"); 147 return; 148 } 149 sc->sc_master = 1; 150 printf(": iic mux present"); 151 } 152 153 if (ea->ea_nintr >= 1) 154 esc->esc_ih = bus_intr_establish(sc->sc_iot, ea->ea_intr[0], 155 IPL_BIO, pcfiic_intr, sc); 156 else 157 esc->esc_ih = NULL; 158 159 160 if (esc->esc_ih == NULL) 161 sc->sc_poll = 1; 162 163 printf("\n"); 164 165 pcfiic_attach(sc, (i2c_addr_t)(addr >> 1), clock, swapregs); 166 } 167
Indexes created Sat Sep 20 22:09:52 GMT 2025