17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*ecd343b6Sarutz * Common Development and Distribution License (the "License"). 6*ecd343b6Sarutz * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 217c478bd9Sstevel@tonic-gate /* 22*ecd343b6Sarutz * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 237c478bd9Sstevel@tonic-gate * Use is subject to license terms. 247c478bd9Sstevel@tonic-gate */ 257c478bd9Sstevel@tonic-gate 267c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 277c478bd9Sstevel@tonic-gate 287c478bd9Sstevel@tonic-gate /* 297c478bd9Sstevel@tonic-gate * This is the nexus driver for SMBUS devices. It mostly does not use 307c478bd9Sstevel@tonic-gate * the SMBUS protocol so that it fits better into the solaris i2c 317c478bd9Sstevel@tonic-gate * framework. 327c478bd9Sstevel@tonic-gate */ 337c478bd9Sstevel@tonic-gate 347c478bd9Sstevel@tonic-gate #include <sys/types.h> 357c478bd9Sstevel@tonic-gate #include <sys/conf.h> 367c478bd9Sstevel@tonic-gate #include <sys/file.h> 377c478bd9Sstevel@tonic-gate #include <sys/open.h> 387c478bd9Sstevel@tonic-gate #include <sys/ddi.h> 397c478bd9Sstevel@tonic-gate #include <sys/sunddi.h> 407c478bd9Sstevel@tonic-gate #include <sys/modctl.h> 417c478bd9Sstevel@tonic-gate #include <sys/stat.h> 427c478bd9Sstevel@tonic-gate #include <sys/kmem.h> 437c478bd9Sstevel@tonic-gate #include <sys/archsystm.h> 447c478bd9Sstevel@tonic-gate #include <sys/platform_module.h> 457c478bd9Sstevel@tonic-gate 467c478bd9Sstevel@tonic-gate #include <sys/i2c/clients/i2c_client.h> 477c478bd9Sstevel@tonic-gate #include <sys/i2c/misc/i2c_svc.h> 487c478bd9Sstevel@tonic-gate #include <sys/i2c/misc/i2c_svc_impl.h> 497c478bd9Sstevel@tonic-gate #include <sys/i2c/nexus/smbus.h> 507c478bd9Sstevel@tonic-gate 517c478bd9Sstevel@tonic-gate /* 527c478bd9Sstevel@tonic-gate * static function declarations 537c478bd9Sstevel@tonic-gate */ 547c478bd9Sstevel@tonic-gate static uint_t smbus_intr_cmn(smbus_t *smbus, char *src); 557c478bd9Sstevel@tonic-gate static void smbus_intr_timeout(void *arg); 567c478bd9Sstevel@tonic-gate static void smbus_resume(dev_info_t *dip); 577c478bd9Sstevel@tonic-gate static void smbus_suspend(dev_info_t *dip); 587c478bd9Sstevel@tonic-gate static int smbus_bus_ctl(dev_info_t *dip, dev_info_t *rdip, 597c478bd9Sstevel@tonic-gate ddi_ctl_enum_t op, void *arg, void *result); 607c478bd9Sstevel@tonic-gate static int smbus_acquire(smbus_t *, dev_info_t *dip, 617c478bd9Sstevel@tonic-gate i2c_transfer_t *tp); 627c478bd9Sstevel@tonic-gate static void smbus_release(smbus_t *); 637c478bd9Sstevel@tonic-gate static int smbus_attach(dev_info_t *dip, ddi_attach_cmd_t cmd); 647c478bd9Sstevel@tonic-gate static int smbus_detach(dev_info_t *dip, ddi_detach_cmd_t cmd); 657c478bd9Sstevel@tonic-gate static void smbus_free_regs(smbus_t *smbus); 667c478bd9Sstevel@tonic-gate static int smbus_setup_regs(dev_info_t *dip, smbus_t *smbus); 677c478bd9Sstevel@tonic-gate static void smbus_reportdev(dev_info_t *dip, dev_info_t *rdip); 687c478bd9Sstevel@tonic-gate static void smbus_uninitchild(dev_info_t *cdip); 697c478bd9Sstevel@tonic-gate static int smbus_initchild(dev_info_t *cdip); 707c478bd9Sstevel@tonic-gate static int smbus_rd(smbus_t *smbus); 717c478bd9Sstevel@tonic-gate static int smbus_wr(smbus_t *smbus); 727c478bd9Sstevel@tonic-gate static void smbus_put(smbus_t *smbus, uint8_t reg, uint8_t data, uint8_t flags); 737c478bd9Sstevel@tonic-gate static uint8_t smbus_get(smbus_t *smbus, uint8_t reg); 747c478bd9Sstevel@tonic-gate static int smbus_dip_to_addr(dev_info_t *dip); 757c478bd9Sstevel@tonic-gate static uint_t smbus_intr(caddr_t arg); 767c478bd9Sstevel@tonic-gate static int smbus_switch(smbus_t *smbus); 777c478bd9Sstevel@tonic-gate 787c478bd9Sstevel@tonic-gate static struct bus_ops smbus_busops = { 797c478bd9Sstevel@tonic-gate BUSO_REV, 807c478bd9Sstevel@tonic-gate nullbusmap, /* bus_map */ 817c478bd9Sstevel@tonic-gate NULL, /* bus_get_intrspec */ 827c478bd9Sstevel@tonic-gate NULL, /* bus_add_intrspec */ 837c478bd9Sstevel@tonic-gate NULL, /* bus_remove_intrspec */ 847c478bd9Sstevel@tonic-gate NULL, /* bus_map_fault */ 857c478bd9Sstevel@tonic-gate ddi_no_dma_map, /* bus_dma_map */ 867c478bd9Sstevel@tonic-gate ddi_no_dma_allochdl, /* bus_dma_allochdl */ 877c478bd9Sstevel@tonic-gate ddi_no_dma_freehdl, /* bus_dma_freehdl */ 887c478bd9Sstevel@tonic-gate ddi_no_dma_bindhdl, /* bus_dma_bindhdl */ 897c478bd9Sstevel@tonic-gate ddi_no_dma_unbindhdl, /* bus_unbindhdl */ 907c478bd9Sstevel@tonic-gate ddi_no_dma_flush, /* bus_dma_flush */ 917c478bd9Sstevel@tonic-gate ddi_no_dma_win, /* bus_dma_win */ 927c478bd9Sstevel@tonic-gate ddi_no_dma_mctl, /* bus_dma_ctl */ 937c478bd9Sstevel@tonic-gate smbus_bus_ctl, /* bus_ctl */ 947c478bd9Sstevel@tonic-gate ddi_bus_prop_op, /* bus_prop_op */ 957c478bd9Sstevel@tonic-gate NULL, /* bus_get_eventcookie */ 967c478bd9Sstevel@tonic-gate NULL, /* bus_add_eventcall */ 977c478bd9Sstevel@tonic-gate NULL, /* bus_remove_eventcall */ 987c478bd9Sstevel@tonic-gate NULL, /* bus_post_event */ 997c478bd9Sstevel@tonic-gate 0, /* bus_intr_ctl */ 1007c478bd9Sstevel@tonic-gate 0, /* bus_config */ 1017c478bd9Sstevel@tonic-gate 0, /* bus_unconfig */ 1027c478bd9Sstevel@tonic-gate 0, /* bus_fm_init */ 1037c478bd9Sstevel@tonic-gate 0, /* bus_fm_fini */ 1047c478bd9Sstevel@tonic-gate 0, /* bus_fm_access_enter */ 1057c478bd9Sstevel@tonic-gate 0, /* bus_fm_access_exit */ 1067c478bd9Sstevel@tonic-gate 0, /* bus_power */ 1077c478bd9Sstevel@tonic-gate i_ddi_intr_ops /* bus_intr_op */ 1087c478bd9Sstevel@tonic-gate }; 1097c478bd9Sstevel@tonic-gate 1107c478bd9Sstevel@tonic-gate struct cb_ops smbus_cb_ops = { 1117c478bd9Sstevel@tonic-gate nodev, /* open */ 1127c478bd9Sstevel@tonic-gate nodev, /* close */ 1137c478bd9Sstevel@tonic-gate nodev, /* strategy */ 1147c478bd9Sstevel@tonic-gate nodev, /* print */ 1157c478bd9Sstevel@tonic-gate nodev, /* dump */ 1167c478bd9Sstevel@tonic-gate nodev, /* read */ 1177c478bd9Sstevel@tonic-gate nodev, /* write */ 1187c478bd9Sstevel@tonic-gate nodev, /* ioctl */ 1197c478bd9Sstevel@tonic-gate nodev, /* devmap */ 1207c478bd9Sstevel@tonic-gate nodev, /* mmap */ 1217c478bd9Sstevel@tonic-gate nodev, /* segmap */ 1227c478bd9Sstevel@tonic-gate nochpoll, /* poll */ 1237c478bd9Sstevel@tonic-gate ddi_prop_op, /* cb_prop_op */ 1247c478bd9Sstevel@tonic-gate 0, /* streamtab */ 1257c478bd9Sstevel@tonic-gate D_MP | D_NEW /* Driver compatibility flag */ 1267c478bd9Sstevel@tonic-gate }; 1277c478bd9Sstevel@tonic-gate 1287c478bd9Sstevel@tonic-gate static struct dev_ops smbus_ops = { 1297c478bd9Sstevel@tonic-gate DEVO_REV, 1307c478bd9Sstevel@tonic-gate 0, 1317c478bd9Sstevel@tonic-gate ddi_no_info, 1327c478bd9Sstevel@tonic-gate nulldev, 1337c478bd9Sstevel@tonic-gate nulldev, 1347c478bd9Sstevel@tonic-gate smbus_attach, 1357c478bd9Sstevel@tonic-gate smbus_detach, 1367c478bd9Sstevel@tonic-gate nodev, 1377c478bd9Sstevel@tonic-gate &smbus_cb_ops, 1387c478bd9Sstevel@tonic-gate &smbus_busops 1397c478bd9Sstevel@tonic-gate }; 1407c478bd9Sstevel@tonic-gate 1417c478bd9Sstevel@tonic-gate static struct modldrv modldrv = { 1427c478bd9Sstevel@tonic-gate &mod_driverops, /* Type of module. This one is a driver */ 1437c478bd9Sstevel@tonic-gate "SMBUS nexus Driver %I%", /* Name of the module. */ 1447c478bd9Sstevel@tonic-gate &smbus_ops, /* driver ops */ 1457c478bd9Sstevel@tonic-gate }; 1467c478bd9Sstevel@tonic-gate 1477c478bd9Sstevel@tonic-gate static struct modlinkage modlinkage = { 1487c478bd9Sstevel@tonic-gate MODREV_1, 1497c478bd9Sstevel@tonic-gate &modldrv, 1507c478bd9Sstevel@tonic-gate NULL 1517c478bd9Sstevel@tonic-gate }; 1527c478bd9Sstevel@tonic-gate 1537c478bd9Sstevel@tonic-gate /* 1547c478bd9Sstevel@tonic-gate * Globals 1557c478bd9Sstevel@tonic-gate */ 1567c478bd9Sstevel@tonic-gate static void *smbus_state; 1577c478bd9Sstevel@tonic-gate 1587c478bd9Sstevel@tonic-gate static int intr_timeout = INTR_TIMEOUT; 1597c478bd9Sstevel@tonic-gate 1607c478bd9Sstevel@tonic-gate /* 1617c478bd9Sstevel@tonic-gate * The "interrupt-priorities" property is how a driver can specify a SPARC 1627c478bd9Sstevel@tonic-gate * PIL level to associate with each of its interrupt properties. Most 1637c478bd9Sstevel@tonic-gate * self-identifying busses have a better mechanism for managing this, but I2C 1647c478bd9Sstevel@tonic-gate * doesn't. 1657c478bd9Sstevel@tonic-gate */ 1667c478bd9Sstevel@tonic-gate int smbus_pil = SMBUS_PIL; 1677c478bd9Sstevel@tonic-gate 1687c478bd9Sstevel@tonic-gate i2c_nexus_reg_t smbus_regvec = { 1697c478bd9Sstevel@tonic-gate I2C_NEXUS_REV, 1707c478bd9Sstevel@tonic-gate smbus_transfer, 1717c478bd9Sstevel@tonic-gate }; 1727c478bd9Sstevel@tonic-gate 1737c478bd9Sstevel@tonic-gate #ifdef DEBUG 1747c478bd9Sstevel@tonic-gate 1757c478bd9Sstevel@tonic-gate static int smbus_print_lvl = 0; 1767c478bd9Sstevel@tonic-gate static char msg_buff[1024]; 1777c478bd9Sstevel@tonic-gate static kmutex_t msg_buf_lock; 1787c478bd9Sstevel@tonic-gate 1797c478bd9Sstevel@tonic-gate void 1807c478bd9Sstevel@tonic-gate smbus_print(int flags, const char *fmt, ...) 1817c478bd9Sstevel@tonic-gate { 1827c478bd9Sstevel@tonic-gate if (flags & smbus_print_lvl) { 1837c478bd9Sstevel@tonic-gate va_list ap; 1847c478bd9Sstevel@tonic-gate 1857c478bd9Sstevel@tonic-gate va_start(ap, fmt); 1867c478bd9Sstevel@tonic-gate 1877c478bd9Sstevel@tonic-gate if (smbus_print_lvl & PRT_PROM) { 1887c478bd9Sstevel@tonic-gate prom_vprintf(fmt, ap); 1897c478bd9Sstevel@tonic-gate } else { 1907c478bd9Sstevel@tonic-gate 1917c478bd9Sstevel@tonic-gate mutex_enter(&msg_buf_lock); 1927c478bd9Sstevel@tonic-gate (void) vsprintf(msg_buff, fmt, ap); 1937c478bd9Sstevel@tonic-gate if (smbus_print_lvl & PRT_BUFFONLY) { 1947c478bd9Sstevel@tonic-gate cmn_err(CE_CONT, "?%s", msg_buff); 1957c478bd9Sstevel@tonic-gate } else { 1967c478bd9Sstevel@tonic-gate cmn_err(CE_CONT, "%s", msg_buff); 1977c478bd9Sstevel@tonic-gate } 1987c478bd9Sstevel@tonic-gate mutex_exit(&msg_buf_lock); 1997c478bd9Sstevel@tonic-gate } 2007c478bd9Sstevel@tonic-gate va_end(ap); 2017c478bd9Sstevel@tonic-gate } 2027c478bd9Sstevel@tonic-gate } 2037c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 2047c478bd9Sstevel@tonic-gate 2057c478bd9Sstevel@tonic-gate int 2067c478bd9Sstevel@tonic-gate _init(void) 2077c478bd9Sstevel@tonic-gate { 2087c478bd9Sstevel@tonic-gate int status; 2097c478bd9Sstevel@tonic-gate 2107c478bd9Sstevel@tonic-gate status = ddi_soft_state_init(&smbus_state, sizeof (smbus_t), 2117c478bd9Sstevel@tonic-gate 1); 2127c478bd9Sstevel@tonic-gate if (status != 0) { 2137c478bd9Sstevel@tonic-gate 2147c478bd9Sstevel@tonic-gate return (status); 2157c478bd9Sstevel@tonic-gate } 2167c478bd9Sstevel@tonic-gate 2177c478bd9Sstevel@tonic-gate if ((status = mod_install(&modlinkage)) != 0) { 2187c478bd9Sstevel@tonic-gate ddi_soft_state_fini(&smbus_state); 2197c478bd9Sstevel@tonic-gate } else { 2207c478bd9Sstevel@tonic-gate #ifdef DEBUG 2217c478bd9Sstevel@tonic-gate mutex_init(&msg_buf_lock, NULL, MUTEX_DRIVER, NULL); 2227c478bd9Sstevel@tonic-gate #endif 2237c478bd9Sstevel@tonic-gate } 2247c478bd9Sstevel@tonic-gate return (status); 2257c478bd9Sstevel@tonic-gate } 2267c478bd9Sstevel@tonic-gate 2277c478bd9Sstevel@tonic-gate int 2287c478bd9Sstevel@tonic-gate _fini(void) 2297c478bd9Sstevel@tonic-gate { 2307c478bd9Sstevel@tonic-gate int status; 2317c478bd9Sstevel@tonic-gate 2327c478bd9Sstevel@tonic-gate if ((status = mod_remove(&modlinkage)) == 0) { 2337c478bd9Sstevel@tonic-gate ddi_soft_state_fini(&smbus_state); 2347c478bd9Sstevel@tonic-gate #ifdef DEBUG 2357c478bd9Sstevel@tonic-gate mutex_destroy(&msg_buf_lock); 2367c478bd9Sstevel@tonic-gate #endif 2377c478bd9Sstevel@tonic-gate } 2387c478bd9Sstevel@tonic-gate 2397c478bd9Sstevel@tonic-gate return (status); 2407c478bd9Sstevel@tonic-gate } 2417c478bd9Sstevel@tonic-gate 2427c478bd9Sstevel@tonic-gate /* 2437c478bd9Sstevel@tonic-gate * The loadable-module _info(9E) entry point 2447c478bd9Sstevel@tonic-gate */ 2457c478bd9Sstevel@tonic-gate int 2467c478bd9Sstevel@tonic-gate _info(struct modinfo *modinfop) 2477c478bd9Sstevel@tonic-gate { 2487c478bd9Sstevel@tonic-gate return (mod_info(&modlinkage, modinfop)); 2497c478bd9Sstevel@tonic-gate } 2507c478bd9Sstevel@tonic-gate 2517c478bd9Sstevel@tonic-gate static void 2527c478bd9Sstevel@tonic-gate smbus_interrupts_on(smbus_t *smbus) 2537c478bd9Sstevel@tonic-gate { 2547c478bd9Sstevel@tonic-gate int src_enable; 2557c478bd9Sstevel@tonic-gate 2567c478bd9Sstevel@tonic-gate src_enable = ddi_get32(smbus->smbus_confighandle, 2577c478bd9Sstevel@tonic-gate (uint32_t *)&smbus->smbus_configregaddr[SMBUS_SRC_ENA]); 2587c478bd9Sstevel@tonic-gate src_enable |= SMBUS_SMI; 2597c478bd9Sstevel@tonic-gate ddi_put32(smbus->smbus_confighandle, 2607c478bd9Sstevel@tonic-gate (uint32_t *)&smbus->smbus_configregaddr[SMBUS_SRC_ENA], 2617c478bd9Sstevel@tonic-gate src_enable); 2627c478bd9Sstevel@tonic-gate (void) ddi_get32(smbus->smbus_confighandle, 2637c478bd9Sstevel@tonic-gate (uint32_t *)&smbus->smbus_configregaddr[SMBUS_SRC_ENA]); 2647c478bd9Sstevel@tonic-gate } 2657c478bd9Sstevel@tonic-gate 2667c478bd9Sstevel@tonic-gate static void 2677c478bd9Sstevel@tonic-gate smbus_interrupts_off(smbus_t *smbus) 2687c478bd9Sstevel@tonic-gate { 2697c478bd9Sstevel@tonic-gate int src_enable; 2707c478bd9Sstevel@tonic-gate 2717c478bd9Sstevel@tonic-gate src_enable = ddi_get32(smbus->smbus_confighandle, 2727c478bd9Sstevel@tonic-gate (uint32_t *)&smbus->smbus_configregaddr[SMBUS_SRC_ENA]); 2737c478bd9Sstevel@tonic-gate src_enable &= ~SMBUS_SMI; 2747c478bd9Sstevel@tonic-gate ddi_put32(smbus->smbus_confighandle, 2757c478bd9Sstevel@tonic-gate (uint32_t *)&smbus->smbus_configregaddr[SMBUS_SRC_ENA], 2767c478bd9Sstevel@tonic-gate src_enable); 2777c478bd9Sstevel@tonic-gate (void) ddi_get32(smbus->smbus_confighandle, 2787c478bd9Sstevel@tonic-gate (uint32_t *)&smbus->smbus_configregaddr[SMBUS_SRC_ENA]); 2797c478bd9Sstevel@tonic-gate } 2807c478bd9Sstevel@tonic-gate 2817c478bd9Sstevel@tonic-gate static void 2827c478bd9Sstevel@tonic-gate smbus_dodetach(dev_info_t *dip) 2837c478bd9Sstevel@tonic-gate { 2847c478bd9Sstevel@tonic-gate smbus_t *smbus; 2857c478bd9Sstevel@tonic-gate int instance = ddi_get_instance(dip); 2867c478bd9Sstevel@tonic-gate 2877c478bd9Sstevel@tonic-gate smbus = ddi_get_soft_state(smbus_state, instance); 2887c478bd9Sstevel@tonic-gate 2897c478bd9Sstevel@tonic-gate if (smbus == NULL) { 2907c478bd9Sstevel@tonic-gate 2917c478bd9Sstevel@tonic-gate return; 2927c478bd9Sstevel@tonic-gate } 2937c478bd9Sstevel@tonic-gate 2947c478bd9Sstevel@tonic-gate cv_destroy(&smbus->smbus_cv); 2957c478bd9Sstevel@tonic-gate mutex_destroy(&smbus->smbus_mutex); 2967c478bd9Sstevel@tonic-gate 2977c478bd9Sstevel@tonic-gate if ((smbus->smbus_attachflags & INTERRUPT_PRI) != 0) { 2987c478bd9Sstevel@tonic-gate (void) ddi_prop_remove(DDI_DEV_T_NONE, dip, 2997c478bd9Sstevel@tonic-gate "interrupt-priorities"); 3007c478bd9Sstevel@tonic-gate } 3017c478bd9Sstevel@tonic-gate 3027c478bd9Sstevel@tonic-gate smbus_free_regs(smbus); 3037c478bd9Sstevel@tonic-gate 3047c478bd9Sstevel@tonic-gate if ((smbus->smbus_attachflags & NEXUS_REGISTER) != 0) { 3057c478bd9Sstevel@tonic-gate i2c_nexus_unregister(dip); 3067c478bd9Sstevel@tonic-gate } 3077c478bd9Sstevel@tonic-gate if ((smbus->smbus_attachflags & IMUTEX) != 0) { 3087c478bd9Sstevel@tonic-gate mutex_destroy(&smbus->smbus_imutex); 3097c478bd9Sstevel@tonic-gate cv_destroy(&smbus->smbus_icv); 3107c478bd9Sstevel@tonic-gate } 3117c478bd9Sstevel@tonic-gate 3127c478bd9Sstevel@tonic-gate if (smbus->smbus_timeout != 0) { 3137c478bd9Sstevel@tonic-gate (void) untimeout(smbus->smbus_timeout); 3147c478bd9Sstevel@tonic-gate } 3157c478bd9Sstevel@tonic-gate 3167c478bd9Sstevel@tonic-gate if ((smbus->smbus_attachflags & ADD_INTR) != 0) { 3177c478bd9Sstevel@tonic-gate ddi_remove_intr(dip, 0, smbus->smbus_icookie); 3187c478bd9Sstevel@tonic-gate } 3197c478bd9Sstevel@tonic-gate 3207c478bd9Sstevel@tonic-gate ddi_soft_state_free(smbus_state, instance); 3217c478bd9Sstevel@tonic-gate } 3227c478bd9Sstevel@tonic-gate 3237c478bd9Sstevel@tonic-gate static int 3247c478bd9Sstevel@tonic-gate smbus_doattach(dev_info_t *dip) 3257c478bd9Sstevel@tonic-gate { 3267c478bd9Sstevel@tonic-gate smbus_t *smbus; 3277c478bd9Sstevel@tonic-gate int instance = ddi_get_instance(dip); 3287c478bd9Sstevel@tonic-gate 3297c478bd9Sstevel@tonic-gate /* 3307c478bd9Sstevel@tonic-gate * Allocate soft state structure. 3317c478bd9Sstevel@tonic-gate */ 3327c478bd9Sstevel@tonic-gate if (ddi_soft_state_zalloc(smbus_state, instance) != DDI_SUCCESS) { 3337c478bd9Sstevel@tonic-gate 3347c478bd9Sstevel@tonic-gate goto bad; 3357c478bd9Sstevel@tonic-gate } 3367c478bd9Sstevel@tonic-gate 3377c478bd9Sstevel@tonic-gate smbus = ddi_get_soft_state(smbus_state, instance); 3387c478bd9Sstevel@tonic-gate 3397c478bd9Sstevel@tonic-gate (void) snprintf(smbus->smbus_name, sizeof (smbus->smbus_name), 3407c478bd9Sstevel@tonic-gate "%s%d", ddi_node_name(dip), instance); 3417c478bd9Sstevel@tonic-gate 3427c478bd9Sstevel@tonic-gate smbus->smbus_dip = dip; 3437c478bd9Sstevel@tonic-gate 3447c478bd9Sstevel@tonic-gate mutex_init(&smbus->smbus_mutex, NULL, MUTEX_DRIVER, NULL); 3457c478bd9Sstevel@tonic-gate mutex_init(&smbus->smbus_imutex, NULL, MUTEX_DRIVER, NULL); 3467c478bd9Sstevel@tonic-gate cv_init(&smbus->smbus_cv, NULL, CV_DRIVER, NULL); 3477c478bd9Sstevel@tonic-gate cv_init(&smbus->smbus_intr_cv, NULL, CV_DRIVER, NULL); 3487c478bd9Sstevel@tonic-gate 3497c478bd9Sstevel@tonic-gate if (smbus_setup_regs(dip, smbus) != DDI_SUCCESS) { 3507c478bd9Sstevel@tonic-gate goto bad; 3517c478bd9Sstevel@tonic-gate } 3527c478bd9Sstevel@tonic-gate 3537c478bd9Sstevel@tonic-gate if (ddi_prop_exists(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS, 3547c478bd9Sstevel@tonic-gate "interrupts") == 1) { 3557c478bd9Sstevel@tonic-gate smbus->smbus_polling = 0; 3567c478bd9Sstevel@tonic-gate /* 3577c478bd9Sstevel@tonic-gate * The "interrupt-priorities" property is how a driver can 3587c478bd9Sstevel@tonic-gate * specify a SPARC PIL level to associate with each of its 3597c478bd9Sstevel@tonic-gate * interrupt properties. Most self-identifying busses have 3607c478bd9Sstevel@tonic-gate * a better mechanism for managing this, but I2C doesn't. 3617c478bd9Sstevel@tonic-gate */ 3627c478bd9Sstevel@tonic-gate if (ddi_prop_exists(DDI_DEV_T_ANY, dip, 3637c478bd9Sstevel@tonic-gate DDI_PROP_NOTPROM | DDI_PROP_DONTPASS, 3647c478bd9Sstevel@tonic-gate "interrupt-priorities") != 1) { 3657c478bd9Sstevel@tonic-gate (void) ddi_prop_create(DDI_DEV_T_NONE, dip, 3667c478bd9Sstevel@tonic-gate DDI_PROP_CANSLEEP, "interrupt-priorities", 3677c478bd9Sstevel@tonic-gate (caddr_t)&smbus_pil, 3687c478bd9Sstevel@tonic-gate sizeof (smbus_pil)); 3697c478bd9Sstevel@tonic-gate smbus->smbus_attachflags |= INTERRUPT_PRI; 3707c478bd9Sstevel@tonic-gate } 3717c478bd9Sstevel@tonic-gate 3727c478bd9Sstevel@tonic-gate /* 3737c478bd9Sstevel@tonic-gate * Clear status to clear any possible interrupt 3747c478bd9Sstevel@tonic-gate */ 3757c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_STS, 0xff, SMBUS_FLUSH); 3767c478bd9Sstevel@tonic-gate 3777c478bd9Sstevel@tonic-gate if (ddi_get_iblock_cookie(dip, 0, &smbus->smbus_icookie) != 3787c478bd9Sstevel@tonic-gate DDI_SUCCESS) { 3797c478bd9Sstevel@tonic-gate goto bad; 3807c478bd9Sstevel@tonic-gate } 3817c478bd9Sstevel@tonic-gate 3827c478bd9Sstevel@tonic-gate if (ddi_add_intr(dip, 0, NULL, NULL, smbus_intr, 3837c478bd9Sstevel@tonic-gate (caddr_t)smbus) != DDI_SUCCESS) { 3847c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "%s failed to add interrupt", 3857c478bd9Sstevel@tonic-gate smbus->smbus_name); 3867c478bd9Sstevel@tonic-gate goto bad; 3877c478bd9Sstevel@tonic-gate } 3887c478bd9Sstevel@tonic-gate smbus->smbus_attachflags |= ADD_INTR; 3897c478bd9Sstevel@tonic-gate } else { 3907c478bd9Sstevel@tonic-gate smbus->smbus_polling = 1; 3917c478bd9Sstevel@tonic-gate /* Clear status */ 3927c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_STS, 0xff, SMBUS_FLUSH); 3937c478bd9Sstevel@tonic-gate } 3947c478bd9Sstevel@tonic-gate 3957c478bd9Sstevel@tonic-gate /* 3967c478bd9Sstevel@tonic-gate * initialize a cv and mutex 3977c478bd9Sstevel@tonic-gate */ 3987c478bd9Sstevel@tonic-gate cv_init(&smbus->smbus_icv, NULL, CV_DRIVER, NULL); 3997c478bd9Sstevel@tonic-gate mutex_init(&smbus->smbus_imutex, NULL, MUTEX_DRIVER, 4007c478bd9Sstevel@tonic-gate (void *)smbus->smbus_icookie); 4017c478bd9Sstevel@tonic-gate smbus->smbus_attachflags |= IMUTEX; 4027c478bd9Sstevel@tonic-gate 4037c478bd9Sstevel@tonic-gate /* 4047c478bd9Sstevel@tonic-gate * Register with the i2c framework 4057c478bd9Sstevel@tonic-gate */ 4067c478bd9Sstevel@tonic-gate i2c_nexus_register(dip, &smbus_regvec); 4077c478bd9Sstevel@tonic-gate smbus->smbus_attachflags |= NEXUS_REGISTER; 4087c478bd9Sstevel@tonic-gate 4097c478bd9Sstevel@tonic-gate return (DDI_SUCCESS); 4107c478bd9Sstevel@tonic-gate 4117c478bd9Sstevel@tonic-gate bad: 4127c478bd9Sstevel@tonic-gate smbus_dodetach(dip); 4137c478bd9Sstevel@tonic-gate 4147c478bd9Sstevel@tonic-gate return (DDI_FAILURE); 4157c478bd9Sstevel@tonic-gate } 4167c478bd9Sstevel@tonic-gate 4177c478bd9Sstevel@tonic-gate static int 4187c478bd9Sstevel@tonic-gate smbus_attach(dev_info_t *dip, ddi_attach_cmd_t cmd) 4197c478bd9Sstevel@tonic-gate { 4207c478bd9Sstevel@tonic-gate switch (cmd) { 4217c478bd9Sstevel@tonic-gate case DDI_ATTACH: 4227c478bd9Sstevel@tonic-gate 4237c478bd9Sstevel@tonic-gate return (smbus_doattach(dip)); 4247c478bd9Sstevel@tonic-gate case DDI_RESUME: 4257c478bd9Sstevel@tonic-gate smbus_resume(dip); 4267c478bd9Sstevel@tonic-gate 4277c478bd9Sstevel@tonic-gate return (DDI_SUCCESS); 4287c478bd9Sstevel@tonic-gate default: 4297c478bd9Sstevel@tonic-gate 4307c478bd9Sstevel@tonic-gate return (DDI_FAILURE); 4317c478bd9Sstevel@tonic-gate } 4327c478bd9Sstevel@tonic-gate } 4337c478bd9Sstevel@tonic-gate 4347c478bd9Sstevel@tonic-gate static int 4357c478bd9Sstevel@tonic-gate smbus_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) 4367c478bd9Sstevel@tonic-gate { 4377c478bd9Sstevel@tonic-gate switch (cmd) { 4387c478bd9Sstevel@tonic-gate case DDI_DETACH: 4397c478bd9Sstevel@tonic-gate smbus_dodetach(dip); 4407c478bd9Sstevel@tonic-gate 4417c478bd9Sstevel@tonic-gate return (DDI_SUCCESS); 4427c478bd9Sstevel@tonic-gate case DDI_SUSPEND: 4437c478bd9Sstevel@tonic-gate smbus_suspend(dip); 4447c478bd9Sstevel@tonic-gate 4457c478bd9Sstevel@tonic-gate return (DDI_SUCCESS); 4467c478bd9Sstevel@tonic-gate default: 4477c478bd9Sstevel@tonic-gate 4487c478bd9Sstevel@tonic-gate return (DDI_FAILURE); 4497c478bd9Sstevel@tonic-gate } 4507c478bd9Sstevel@tonic-gate } 4517c478bd9Sstevel@tonic-gate 4527c478bd9Sstevel@tonic-gate static int 4537c478bd9Sstevel@tonic-gate smbus_bus_ctl(dev_info_t *dip, dev_info_t *rdip, ddi_ctl_enum_t op, 4547c478bd9Sstevel@tonic-gate void *arg, void *result) 4557c478bd9Sstevel@tonic-gate { 4567c478bd9Sstevel@tonic-gate switch (op) { 4577c478bd9Sstevel@tonic-gate case DDI_CTLOPS_INITCHILD: 4587c478bd9Sstevel@tonic-gate 4597c478bd9Sstevel@tonic-gate return (smbus_initchild((dev_info_t *)arg)); 4607c478bd9Sstevel@tonic-gate case DDI_CTLOPS_UNINITCHILD: 4617c478bd9Sstevel@tonic-gate smbus_uninitchild((dev_info_t *)arg); 4627c478bd9Sstevel@tonic-gate 4637c478bd9Sstevel@tonic-gate return (DDI_SUCCESS); 464*ecd343b6Sarutz case DDI_CTLOPS_REPORTDEV: 4657c478bd9Sstevel@tonic-gate smbus_reportdev(dip, rdip); 4667c478bd9Sstevel@tonic-gate 4677c478bd9Sstevel@tonic-gate return (DDI_SUCCESS); 4687c478bd9Sstevel@tonic-gate case DDI_CTLOPS_DMAPMAPC: 4697c478bd9Sstevel@tonic-gate case DDI_CTLOPS_POKE: 4707c478bd9Sstevel@tonic-gate case DDI_CTLOPS_PEEK: 4717c478bd9Sstevel@tonic-gate case DDI_CTLOPS_IOMIN: 4727c478bd9Sstevel@tonic-gate case DDI_CTLOPS_REPORTINT: 4737c478bd9Sstevel@tonic-gate case DDI_CTLOPS_SIDDEV: 4747c478bd9Sstevel@tonic-gate case DDI_CTLOPS_SLAVEONLY: 4757c478bd9Sstevel@tonic-gate case DDI_CTLOPS_AFFINITY: 4767c478bd9Sstevel@tonic-gate case DDI_CTLOPS_PTOB: 4777c478bd9Sstevel@tonic-gate case DDI_CTLOPS_BTOP: 4787c478bd9Sstevel@tonic-gate case DDI_CTLOPS_BTOPR: 4797c478bd9Sstevel@tonic-gate case DDI_CTLOPS_DVMAPAGESIZE: 4807c478bd9Sstevel@tonic-gate 4817c478bd9Sstevel@tonic-gate return (DDI_FAILURE); 4827c478bd9Sstevel@tonic-gate default: 4837c478bd9Sstevel@tonic-gate 4847c478bd9Sstevel@tonic-gate return (ddi_ctlops(dip, rdip, op, arg, result)); 4857c478bd9Sstevel@tonic-gate } 4867c478bd9Sstevel@tonic-gate } 4877c478bd9Sstevel@tonic-gate 4887c478bd9Sstevel@tonic-gate static int 4897c478bd9Sstevel@tonic-gate smbus_initchild(dev_info_t *cdip) 4907c478bd9Sstevel@tonic-gate { 4917c478bd9Sstevel@tonic-gate int32_t cell_size; 4927c478bd9Sstevel@tonic-gate int len; 4937c478bd9Sstevel@tonic-gate int32_t regs[2]; 4947c478bd9Sstevel@tonic-gate int err; 4957c478bd9Sstevel@tonic-gate smbus_ppvt_t *ppvt; 4967c478bd9Sstevel@tonic-gate char name[30]; 4977c478bd9Sstevel@tonic-gate 4987c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_INIT, "smbus_initchild ENTER: %s\n", 4997c478bd9Sstevel@tonic-gate ddi_node_name(cdip))); 5007c478bd9Sstevel@tonic-gate 5017c478bd9Sstevel@tonic-gate len = sizeof (cell_size); 5027c478bd9Sstevel@tonic-gate err = ddi_getlongprop_buf(DDI_DEV_T_ANY, cdip, 5037c478bd9Sstevel@tonic-gate DDI_PROP_CANSLEEP, "#address-cells", 5047c478bd9Sstevel@tonic-gate (caddr_t)&cell_size, &len); 5057c478bd9Sstevel@tonic-gate if (err != DDI_PROP_SUCCESS || len != sizeof (cell_size)) { 5067c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "cannot find address-cells"); 5077c478bd9Sstevel@tonic-gate 5087c478bd9Sstevel@tonic-gate return (DDI_FAILURE); 5097c478bd9Sstevel@tonic-gate } 5107c478bd9Sstevel@tonic-gate 5117c478bd9Sstevel@tonic-gate len = sizeof (regs); 5127c478bd9Sstevel@tonic-gate err = ddi_getlongprop_buf(DDI_DEV_T_ANY, cdip, 5137c478bd9Sstevel@tonic-gate DDI_PROP_DONTPASS | DDI_PROP_CANSLEEP, 5147c478bd9Sstevel@tonic-gate "reg", (caddr_t)regs, &len); 5157c478bd9Sstevel@tonic-gate 5167c478bd9Sstevel@tonic-gate if (err != DDI_PROP_SUCCESS) { 5177c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "cannot get reg property"); 5187c478bd9Sstevel@tonic-gate 5197c478bd9Sstevel@tonic-gate return (DDI_FAILURE); 5207c478bd9Sstevel@tonic-gate } 5217c478bd9Sstevel@tonic-gate 5227c478bd9Sstevel@tonic-gate ppvt = kmem_zalloc(sizeof (smbus_ppvt_t), KM_SLEEP); 5237c478bd9Sstevel@tonic-gate ddi_set_parent_data(cdip, ppvt); 5247c478bd9Sstevel@tonic-gate 5257c478bd9Sstevel@tonic-gate /* 5267c478bd9Sstevel@tonic-gate * The reg property contains an unused first element (which is 5277c478bd9Sstevel@tonic-gate * the mux addr on xcal), and the second element is the i2c bus 5287c478bd9Sstevel@tonic-gate * address of the device. 5297c478bd9Sstevel@tonic-gate */ 5307c478bd9Sstevel@tonic-gate ppvt->smbus_ppvt_addr = regs[1]; 5317c478bd9Sstevel@tonic-gate (void) sprintf(name, "%x", regs[1]); 5327c478bd9Sstevel@tonic-gate 5337c478bd9Sstevel@tonic-gate ddi_set_name_addr(cdip, name); 5347c478bd9Sstevel@tonic-gate 5357c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_INIT, "smbus_initchild SUCCESS: %s\n", 5367c478bd9Sstevel@tonic-gate ddi_node_name(cdip))); 5377c478bd9Sstevel@tonic-gate 5387c478bd9Sstevel@tonic-gate return (DDI_SUCCESS); 5397c478bd9Sstevel@tonic-gate } 5407c478bd9Sstevel@tonic-gate 5417c478bd9Sstevel@tonic-gate static void 5427c478bd9Sstevel@tonic-gate smbus_uninitchild(dev_info_t *cdip) 5437c478bd9Sstevel@tonic-gate { 5447c478bd9Sstevel@tonic-gate smbus_ppvt_t *ppvt; 5457c478bd9Sstevel@tonic-gate 5467c478bd9Sstevel@tonic-gate ppvt = ddi_get_parent_data(cdip); 5477c478bd9Sstevel@tonic-gate ddi_set_parent_data(cdip, NULL); 5487c478bd9Sstevel@tonic-gate 5497c478bd9Sstevel@tonic-gate ddi_set_name_addr(cdip, NULL); 5507c478bd9Sstevel@tonic-gate 5517c478bd9Sstevel@tonic-gate kmem_free(ppvt, sizeof (smbus_ppvt_t)); 5527c478bd9Sstevel@tonic-gate 5537c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_INIT, "smbus_uninitchild: %s\n", ddi_node_name(cdip))); 5547c478bd9Sstevel@tonic-gate } 5557c478bd9Sstevel@tonic-gate 5567c478bd9Sstevel@tonic-gate static void 5577c478bd9Sstevel@tonic-gate smbus_reportdev(dev_info_t *dip, dev_info_t *rdip) 5587c478bd9Sstevel@tonic-gate { 5597c478bd9Sstevel@tonic-gate smbus_ppvt_t *ppvt; 5607c478bd9Sstevel@tonic-gate 5617c478bd9Sstevel@tonic-gate ppvt = ddi_get_parent_data(rdip); 5627c478bd9Sstevel@tonic-gate 5637c478bd9Sstevel@tonic-gate cmn_err(CE_CONT, "?%s%d at %s%d: addr 0x%x", 5647c478bd9Sstevel@tonic-gate ddi_driver_name(rdip), ddi_get_instance(rdip), 5657c478bd9Sstevel@tonic-gate ddi_driver_name(dip), ddi_get_instance(dip), 5667c478bd9Sstevel@tonic-gate ppvt->smbus_ppvt_addr); 5677c478bd9Sstevel@tonic-gate } 5687c478bd9Sstevel@tonic-gate 5697c478bd9Sstevel@tonic-gate /* 5707c478bd9Sstevel@tonic-gate * smbus_setup_regs() is called to map in the registers 5717c478bd9Sstevel@tonic-gate * specific to the smbus. 5727c478bd9Sstevel@tonic-gate */ 5737c478bd9Sstevel@tonic-gate static int 5747c478bd9Sstevel@tonic-gate smbus_setup_regs(dev_info_t *dip, smbus_t *smbus) 5757c478bd9Sstevel@tonic-gate { 5767c478bd9Sstevel@tonic-gate ddi_device_acc_attr_t attr; 5777c478bd9Sstevel@tonic-gate int ret; 5787c478bd9Sstevel@tonic-gate 5797c478bd9Sstevel@tonic-gate attr.devacc_attr_version = DDI_DEVICE_ATTR_V0; 5807c478bd9Sstevel@tonic-gate attr.devacc_attr_endian_flags = DDI_STRUCTURE_LE_ACC; 5817c478bd9Sstevel@tonic-gate attr.devacc_attr_dataorder = DDI_STRICTORDER_ACC; 5827c478bd9Sstevel@tonic-gate 5837c478bd9Sstevel@tonic-gate ret = ddi_regs_map_setup(dip, 1, (caddr_t *)&smbus->smbus_regaddr, 5847c478bd9Sstevel@tonic-gate 0, 0, &attr, &smbus->smbus_rhandle); 5857c478bd9Sstevel@tonic-gate 5867c478bd9Sstevel@tonic-gate if (ret == DDI_FAILURE) { 5877c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "%s unable to map regs", smbus->smbus_name); 5887c478bd9Sstevel@tonic-gate 5897c478bd9Sstevel@tonic-gate } else if (ret == DDI_REGS_ACC_CONFLICT) { 5907c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 5917c478bd9Sstevel@tonic-gate "%s unable to map regs because of conflict", 5927c478bd9Sstevel@tonic-gate smbus->smbus_name); 5937c478bd9Sstevel@tonic-gate ret = DDI_FAILURE; 5947c478bd9Sstevel@tonic-gate } 5957c478bd9Sstevel@tonic-gate 5967c478bd9Sstevel@tonic-gate if (ret == DDI_FAILURE) { 5977c478bd9Sstevel@tonic-gate 5987c478bd9Sstevel@tonic-gate return (ret); 5997c478bd9Sstevel@tonic-gate } 6007c478bd9Sstevel@tonic-gate 6017c478bd9Sstevel@tonic-gate ret = ddi_regs_map_setup(dip, 0, (caddr_t *)&smbus->smbus_configregaddr, 6027c478bd9Sstevel@tonic-gate 0, 0, &attr, &smbus->smbus_confighandle); 6037c478bd9Sstevel@tonic-gate 6047c478bd9Sstevel@tonic-gate if (ret == DDI_FAILURE) { 6057c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "%s unable to map config regs", 6067c478bd9Sstevel@tonic-gate smbus->smbus_name); 6077c478bd9Sstevel@tonic-gate 6087c478bd9Sstevel@tonic-gate } else if (ret == DDI_REGS_ACC_CONFLICT) { 6097c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 6107c478bd9Sstevel@tonic-gate "%s unable to map config regs because of conflict", 6117c478bd9Sstevel@tonic-gate smbus->smbus_name); 6127c478bd9Sstevel@tonic-gate ret = DDI_FAILURE; 6137c478bd9Sstevel@tonic-gate } 6147c478bd9Sstevel@tonic-gate 6157c478bd9Sstevel@tonic-gate return (ret); 6167c478bd9Sstevel@tonic-gate } 6177c478bd9Sstevel@tonic-gate 6187c478bd9Sstevel@tonic-gate /* 6197c478bd9Sstevel@tonic-gate * smbus_free_regs() frees any registers previously allocated. 6207c478bd9Sstevel@tonic-gate */ 6217c478bd9Sstevel@tonic-gate static void 6227c478bd9Sstevel@tonic-gate smbus_free_regs(smbus_t *smbus) 6237c478bd9Sstevel@tonic-gate { 6247c478bd9Sstevel@tonic-gate if (smbus->smbus_regaddr != NULL) { 6257c478bd9Sstevel@tonic-gate ddi_regs_map_free(&smbus->smbus_rhandle); 6267c478bd9Sstevel@tonic-gate } 6277c478bd9Sstevel@tonic-gate 6287c478bd9Sstevel@tonic-gate if (smbus->smbus_configregaddr != NULL) { 6297c478bd9Sstevel@tonic-gate ddi_regs_map_free(&smbus->smbus_confighandle); 6307c478bd9Sstevel@tonic-gate } 6317c478bd9Sstevel@tonic-gate } 6327c478bd9Sstevel@tonic-gate 6337c478bd9Sstevel@tonic-gate /* 6347c478bd9Sstevel@tonic-gate * smbus_dip_to_addr() takes a dip and returns an I2C address. 6357c478bd9Sstevel@tonic-gate */ 6367c478bd9Sstevel@tonic-gate static int 6377c478bd9Sstevel@tonic-gate smbus_dip_to_addr(dev_info_t *cdip) 6387c478bd9Sstevel@tonic-gate { 6397c478bd9Sstevel@tonic-gate smbus_ppvt_t *ppvt; 6407c478bd9Sstevel@tonic-gate 6417c478bd9Sstevel@tonic-gate ppvt = ddi_get_parent_data(cdip); 6427c478bd9Sstevel@tonic-gate 6437c478bd9Sstevel@tonic-gate return (ppvt->smbus_ppvt_addr); 6447c478bd9Sstevel@tonic-gate } 6457c478bd9Sstevel@tonic-gate 6467c478bd9Sstevel@tonic-gate /* 6477c478bd9Sstevel@tonic-gate * smbus_suspend() is called before the system suspends. Existing 6487c478bd9Sstevel@tonic-gate * transfer in progress or waiting will complete, but new transfers are 6497c478bd9Sstevel@tonic-gate * effectively blocked by "acquiring" the bus. 6507c478bd9Sstevel@tonic-gate */ 6517c478bd9Sstevel@tonic-gate static void 6527c478bd9Sstevel@tonic-gate smbus_suspend(dev_info_t *dip) 6537c478bd9Sstevel@tonic-gate { 6547c478bd9Sstevel@tonic-gate smbus_t *smbus; 6557c478bd9Sstevel@tonic-gate int instance; 6567c478bd9Sstevel@tonic-gate 6577c478bd9Sstevel@tonic-gate instance = ddi_get_instance(dip); 6587c478bd9Sstevel@tonic-gate smbus = ddi_get_soft_state(smbus_state, instance); 6597c478bd9Sstevel@tonic-gate 6607c478bd9Sstevel@tonic-gate (void) smbus_acquire(smbus, NULL, NULL); 6617c478bd9Sstevel@tonic-gate } 6627c478bd9Sstevel@tonic-gate 6637c478bd9Sstevel@tonic-gate /* 6647c478bd9Sstevel@tonic-gate * smbus_resume() is called when the system resumes from CPR. It releases 6657c478bd9Sstevel@tonic-gate * the hold that was placed on the i2c bus, which allows any real 6667c478bd9Sstevel@tonic-gate * transfers to continue. 6677c478bd9Sstevel@tonic-gate */ 6687c478bd9Sstevel@tonic-gate static void 6697c478bd9Sstevel@tonic-gate smbus_resume(dev_info_t *dip) 6707c478bd9Sstevel@tonic-gate { 6717c478bd9Sstevel@tonic-gate smbus_t *smbus; 6727c478bd9Sstevel@tonic-gate int instance; 6737c478bd9Sstevel@tonic-gate 6747c478bd9Sstevel@tonic-gate instance = ddi_get_instance(dip); 6757c478bd9Sstevel@tonic-gate smbus = ddi_get_soft_state(smbus_state, instance); 6767c478bd9Sstevel@tonic-gate 6777c478bd9Sstevel@tonic-gate smbus_release(smbus); 6787c478bd9Sstevel@tonic-gate } 6797c478bd9Sstevel@tonic-gate 6807c478bd9Sstevel@tonic-gate /* 6817c478bd9Sstevel@tonic-gate * smbus_acquire() is called by a thread wishing to "own" the SMbus. 6827c478bd9Sstevel@tonic-gate * It should not be held across multiple transfers. 6837c478bd9Sstevel@tonic-gate */ 6847c478bd9Sstevel@tonic-gate static int 6857c478bd9Sstevel@tonic-gate smbus_acquire(smbus_t *smbus, dev_info_t *dip, i2c_transfer_t *tp) 6867c478bd9Sstevel@tonic-gate { 6877c478bd9Sstevel@tonic-gate mutex_enter(&smbus->smbus_mutex); 6887c478bd9Sstevel@tonic-gate while (smbus->smbus_busy) { 6897c478bd9Sstevel@tonic-gate cv_wait(&smbus->smbus_cv, &smbus->smbus_mutex); 6907c478bd9Sstevel@tonic-gate } 6917c478bd9Sstevel@tonic-gate smbus->smbus_busy = 1; 6927c478bd9Sstevel@tonic-gate mutex_exit(&smbus->smbus_mutex); 6937c478bd9Sstevel@tonic-gate 6947c478bd9Sstevel@tonic-gate /* 6957c478bd9Sstevel@tonic-gate * On systems where OBP shares a smbus controller with the 6967c478bd9Sstevel@tonic-gate * OS, plat_shared_i2c_enter will serialize access to the 6977c478bd9Sstevel@tonic-gate * smbus controller. Do not grab this lock during CPR 6987c478bd9Sstevel@tonic-gate * suspend as the CPR thread also acquires this muxex 6997c478bd9Sstevel@tonic-gate * through through prom_setprop which causes recursive 7007c478bd9Sstevel@tonic-gate * mutex enter. 7017c478bd9Sstevel@tonic-gate * 7027c478bd9Sstevel@tonic-gate * dip == NULL during CPR. 7037c478bd9Sstevel@tonic-gate */ 7047c478bd9Sstevel@tonic-gate if ((&plat_shared_i2c_enter != NULL) && (dip != NULL)) { 7057c478bd9Sstevel@tonic-gate plat_shared_i2c_enter(smbus->smbus_dip); 7067c478bd9Sstevel@tonic-gate } 7077c478bd9Sstevel@tonic-gate 7087c478bd9Sstevel@tonic-gate smbus->smbus_cur_tran = tp; 7097c478bd9Sstevel@tonic-gate smbus->smbus_cur_dip = dip; 7107c478bd9Sstevel@tonic-gate 7117c478bd9Sstevel@tonic-gate return (SMBUS_SUCCESS); 7127c478bd9Sstevel@tonic-gate } 7137c478bd9Sstevel@tonic-gate 7147c478bd9Sstevel@tonic-gate /* 7157c478bd9Sstevel@tonic-gate * smbus_release() is called to release a hold made by smbus_acquire(). 7167c478bd9Sstevel@tonic-gate */ 7177c478bd9Sstevel@tonic-gate static void 7187c478bd9Sstevel@tonic-gate smbus_release(smbus_t *smbus) 7197c478bd9Sstevel@tonic-gate { 7207c478bd9Sstevel@tonic-gate mutex_enter(&smbus->smbus_mutex); 7217c478bd9Sstevel@tonic-gate smbus->smbus_busy = 0; 7227c478bd9Sstevel@tonic-gate cv_signal(&smbus->smbus_cv); 7237c478bd9Sstevel@tonic-gate smbus->smbus_cur_tran = NULL; 7247c478bd9Sstevel@tonic-gate smbus->smbus_cur_dip = NULL; 7257c478bd9Sstevel@tonic-gate mutex_exit(&smbus->smbus_mutex); 7267c478bd9Sstevel@tonic-gate 7277c478bd9Sstevel@tonic-gate if ((&plat_shared_i2c_exit != NULL) && (smbus->smbus_cur_dip != NULL)) { 7287c478bd9Sstevel@tonic-gate plat_shared_i2c_exit(smbus->smbus_dip); 7297c478bd9Sstevel@tonic-gate } 7307c478bd9Sstevel@tonic-gate } 7317c478bd9Sstevel@tonic-gate 7327c478bd9Sstevel@tonic-gate static void 7337c478bd9Sstevel@tonic-gate smbus_put(smbus_t *smbus, uint8_t reg, uint8_t data, uint8_t flags) 7347c478bd9Sstevel@tonic-gate { 7357c478bd9Sstevel@tonic-gate ddi_acc_handle_t hp = smbus->smbus_rhandle; 7367c478bd9Sstevel@tonic-gate uint8_t *reg_addr = smbus->smbus_regaddr; 7377c478bd9Sstevel@tonic-gate uint8_t *config_addr = smbus->smbus_configregaddr; 7387c478bd9Sstevel@tonic-gate ddi_acc_handle_t config_handle = smbus->smbus_confighandle; 7397c478bd9Sstevel@tonic-gate 7407c478bd9Sstevel@tonic-gate ddi_put8(hp, ®_addr[reg], data); 7417c478bd9Sstevel@tonic-gate 7427c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_PUT, "smbus_put: addr = %p data = %x\n", 7437c478bd9Sstevel@tonic-gate ®_addr[reg], data)); 7447c478bd9Sstevel@tonic-gate 7457c478bd9Sstevel@tonic-gate /* 7467c478bd9Sstevel@tonic-gate * if FLUSH flag is passed, read a config regs to make sure 7477c478bd9Sstevel@tonic-gate * data written is flushed. 7487c478bd9Sstevel@tonic-gate */ 7497c478bd9Sstevel@tonic-gate if (flags & SMBUS_FLUSH) { 7507c478bd9Sstevel@tonic-gate (void) ddi_get8(config_handle, &config_addr[0]); 7517c478bd9Sstevel@tonic-gate } 7527c478bd9Sstevel@tonic-gate } 7537c478bd9Sstevel@tonic-gate 7547c478bd9Sstevel@tonic-gate static uint8_t 7557c478bd9Sstevel@tonic-gate smbus_get(smbus_t *smbus, uint8_t reg) 7567c478bd9Sstevel@tonic-gate { 7577c478bd9Sstevel@tonic-gate 7587c478bd9Sstevel@tonic-gate ddi_acc_handle_t hp = smbus->smbus_rhandle; 7597c478bd9Sstevel@tonic-gate uint8_t *regaddr = smbus->smbus_regaddr; 7607c478bd9Sstevel@tonic-gate uint8_t data; 7617c478bd9Sstevel@tonic-gate 7627c478bd9Sstevel@tonic-gate data = ddi_get8(hp, ®addr[reg]); 7637c478bd9Sstevel@tonic-gate 7647c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_GET, "smbus_get: data = %x\n", data)); 7657c478bd9Sstevel@tonic-gate 7667c478bd9Sstevel@tonic-gate return (data); 7677c478bd9Sstevel@tonic-gate } 7687c478bd9Sstevel@tonic-gate 7697c478bd9Sstevel@tonic-gate 7707c478bd9Sstevel@tonic-gate /* 7717c478bd9Sstevel@tonic-gate * The southbridge smbus device appears to have a feature where 7727c478bd9Sstevel@tonic-gate * reads from the status register return 0 for a few microseconds 7737c478bd9Sstevel@tonic-gate * after clearing the status. 7747c478bd9Sstevel@tonic-gate * 7757c478bd9Sstevel@tonic-gate * "status_wait_idle" allows for this by retrying until 7767c478bd9Sstevel@tonic-gate * it gets the right answer or times out. The loop count 7777c478bd9Sstevel@tonic-gate * and the delay are empirical. The routine uses up 7787c478bd9Sstevel@tonic-gate * 400 us if it fails. 7797c478bd9Sstevel@tonic-gate * 7807c478bd9Sstevel@tonic-gate * The fact that this routine waits for 10 us before the 7817c478bd9Sstevel@tonic-gate * first check is deliberate. 7827c478bd9Sstevel@tonic-gate */ 7837c478bd9Sstevel@tonic-gate static int 7847c478bd9Sstevel@tonic-gate smbus_wait_idle(smbus_t *smbus) 7857c478bd9Sstevel@tonic-gate { 7867c478bd9Sstevel@tonic-gate int retries = 40; 7877c478bd9Sstevel@tonic-gate int status; 7887c478bd9Sstevel@tonic-gate 7897c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_STS, 0xff, SMBUS_FLUSH); 7907c478bd9Sstevel@tonic-gate do { 7917c478bd9Sstevel@tonic-gate drv_usecwait(10); 7927c478bd9Sstevel@tonic-gate status = smbus_get(smbus, SMB_STS); 7937c478bd9Sstevel@tonic-gate } while (status != IDLE && --retries > 0); 7947c478bd9Sstevel@tonic-gate return (status); 7957c478bd9Sstevel@tonic-gate } 7967c478bd9Sstevel@tonic-gate /* 7977c478bd9Sstevel@tonic-gate * smbus_transfer is the function that is registered with 7987c478bd9Sstevel@tonic-gate * I2C services to be called for each i2c transaction. 7997c478bd9Sstevel@tonic-gate */ 8007c478bd9Sstevel@tonic-gate int 8017c478bd9Sstevel@tonic-gate smbus_transfer(dev_info_t *dip, i2c_transfer_t *tp) 8027c478bd9Sstevel@tonic-gate { 8037c478bd9Sstevel@tonic-gate smbus_t *smbus; 8047c478bd9Sstevel@tonic-gate uint8_t status; 8057c478bd9Sstevel@tonic-gate clock_t ctime; 8067c478bd9Sstevel@tonic-gate 8077c478bd9Sstevel@tonic-gate smbus = ddi_get_soft_state(smbus_state, 8087c478bd9Sstevel@tonic-gate ddi_get_instance(ddi_get_parent(dip))); 8097c478bd9Sstevel@tonic-gate 8107c478bd9Sstevel@tonic-gate if (smbus_acquire(smbus, dip, tp) == SMBUS_FAILURE) { 8117c478bd9Sstevel@tonic-gate tp->i2c_result = I2C_FAILURE; 8127c478bd9Sstevel@tonic-gate 8137c478bd9Sstevel@tonic-gate return (I2C_FAILURE); 8147c478bd9Sstevel@tonic-gate } 8157c478bd9Sstevel@tonic-gate 8167c478bd9Sstevel@tonic-gate tp->i2c_r_resid = tp->i2c_rlen; 8177c478bd9Sstevel@tonic-gate tp->i2c_w_resid = tp->i2c_wlen; 8187c478bd9Sstevel@tonic-gate tp->i2c_result = I2C_SUCCESS; 8197c478bd9Sstevel@tonic-gate smbus->smbus_retries = 0; 8207c478bd9Sstevel@tonic-gate smbus->smbus_bytes_to_read = 0; 8217c478bd9Sstevel@tonic-gate 8227c478bd9Sstevel@tonic-gate mutex_enter(&smbus->smbus_imutex); 8237c478bd9Sstevel@tonic-gate 8247c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_TRANS, "smbus_transfer: rlen=%d wlen=%d flags=%d", 8257c478bd9Sstevel@tonic-gate tp->i2c_r_resid, tp->i2c_w_resid, tp->i2c_flags)); 8267c478bd9Sstevel@tonic-gate 8277c478bd9Sstevel@tonic-gate /* 8287c478bd9Sstevel@tonic-gate * First clear the status bits, then read them back to determine 8297c478bd9Sstevel@tonic-gate * the current state. 8307c478bd9Sstevel@tonic-gate */ 8317c478bd9Sstevel@tonic-gate status = smbus_wait_idle(smbus); 8327c478bd9Sstevel@tonic-gate 8337c478bd9Sstevel@tonic-gate if (status != IDLE) { 8347c478bd9Sstevel@tonic-gate /* 8357c478bd9Sstevel@tonic-gate * Try to issue bus reset 8367c478bd9Sstevel@tonic-gate * First reset the state machine. 8377c478bd9Sstevel@tonic-gate */ 8387c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_TYP, KILL, SMBUS_FLUSH); 8397c478bd9Sstevel@tonic-gate status = smbus_wait_idle(smbus); 8407c478bd9Sstevel@tonic-gate 8417c478bd9Sstevel@tonic-gate if (status != IDLE) { 8427c478bd9Sstevel@tonic-gate 8437c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_TYP, T_OUT, SMBUS_FLUSH); 8447c478bd9Sstevel@tonic-gate status = smbus_wait_idle(smbus); 8457c478bd9Sstevel@tonic-gate if (status != IDLE) { 8467c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 8477c478bd9Sstevel@tonic-gate "%s smbus not idle. Unable to reset %x", 8487c478bd9Sstevel@tonic-gate smbus->smbus_name, status); 8497c478bd9Sstevel@tonic-gate smbus->smbus_cur_tran->i2c_result = I2C_FAILURE; 8507c478bd9Sstevel@tonic-gate mutex_exit(&smbus->smbus_imutex); 8517c478bd9Sstevel@tonic-gate smbus_release(smbus); 8527c478bd9Sstevel@tonic-gate 8537c478bd9Sstevel@tonic-gate return (I2C_FAILURE); 8547c478bd9Sstevel@tonic-gate } else { 8557c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "%s T_OUT reset required", 8567c478bd9Sstevel@tonic-gate smbus->smbus_name); 8577c478bd9Sstevel@tonic-gate } 8587c478bd9Sstevel@tonic-gate } 8597c478bd9Sstevel@tonic-gate } 8607c478bd9Sstevel@tonic-gate 8617c478bd9Sstevel@tonic-gate if (smbus_switch(smbus) != SMBUS_COMPLETE) { 8627c478bd9Sstevel@tonic-gate if (smbus->smbus_polling) { 8637c478bd9Sstevel@tonic-gate smbus->smbus_poll_complete = 0; 8647c478bd9Sstevel@tonic-gate smbus->smbus_poll_retries = 0; 8657c478bd9Sstevel@tonic-gate do { 8667c478bd9Sstevel@tonic-gate drv_usecwait(SMBUS_POLL_INTERVAL); 8677c478bd9Sstevel@tonic-gate (void) smbus_intr_cmn(smbus, SMBUS_POLL); 8687c478bd9Sstevel@tonic-gate } while (!smbus->smbus_poll_complete); 8697c478bd9Sstevel@tonic-gate } else { 8707c478bd9Sstevel@tonic-gate /* 8717c478bd9Sstevel@tonic-gate * Start a timeout as there is a bug in southbridge 8727c478bd9Sstevel@tonic-gate * smbus where sometimes a transaction never starts, 8737c478bd9Sstevel@tonic-gate * and needs to be reinitiated. 8747c478bd9Sstevel@tonic-gate */ 8757c478bd9Sstevel@tonic-gate 8767c478bd9Sstevel@tonic-gate smbus->smbus_timeout = timeout(smbus_intr_timeout, 8777c478bd9Sstevel@tonic-gate smbus, drv_usectohz(intr_timeout)); 8787c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_TRANS, 8797c478bd9Sstevel@tonic-gate "starting timeout in smbus_transfer %p", 8807c478bd9Sstevel@tonic-gate smbus->smbus_timeout)); 8817c478bd9Sstevel@tonic-gate 8827c478bd9Sstevel@tonic-gate ctime = ddi_get_lbolt(); 8837c478bd9Sstevel@tonic-gate ctime += drv_usectohz(SMBUS_TRANS_TIMEOUT); 8847c478bd9Sstevel@tonic-gate 8857c478bd9Sstevel@tonic-gate smbus_interrupts_on(smbus); 8867c478bd9Sstevel@tonic-gate 8877c478bd9Sstevel@tonic-gate 8887c478bd9Sstevel@tonic-gate cv_wait(&smbus->smbus_icv, &smbus->smbus_imutex); 8897c478bd9Sstevel@tonic-gate } 8907c478bd9Sstevel@tonic-gate } 8917c478bd9Sstevel@tonic-gate 8927c478bd9Sstevel@tonic-gate 8937c478bd9Sstevel@tonic-gate mutex_exit(&smbus->smbus_imutex); 8947c478bd9Sstevel@tonic-gate smbus_release(smbus); 8957c478bd9Sstevel@tonic-gate 8967c478bd9Sstevel@tonic-gate return (tp->i2c_result); 8977c478bd9Sstevel@tonic-gate } 8987c478bd9Sstevel@tonic-gate 8997c478bd9Sstevel@tonic-gate /* 9007c478bd9Sstevel@tonic-gate * This is called by smbus_intr_cmn() to figure out whether to call 9017c478bd9Sstevel@tonic-gate * smbus_wr or smbus_rd depending on the command and current state. 9027c478bd9Sstevel@tonic-gate */ 9037c478bd9Sstevel@tonic-gate static int 9047c478bd9Sstevel@tonic-gate smbus_switch(smbus_t *smbus) 9057c478bd9Sstevel@tonic-gate { 9067c478bd9Sstevel@tonic-gate int ret; 9077c478bd9Sstevel@tonic-gate i2c_transfer_t *tp = smbus->smbus_cur_tran; 9087c478bd9Sstevel@tonic-gate 9097c478bd9Sstevel@tonic-gate if (tp == NULL) { 9107c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 9117c478bd9Sstevel@tonic-gate "%s smbus_cur_tran is NULL. Transaction failed", 9127c478bd9Sstevel@tonic-gate smbus->smbus_name); 9137c478bd9Sstevel@tonic-gate 9147c478bd9Sstevel@tonic-gate return (SMBUS_FAILURE); 9157c478bd9Sstevel@tonic-gate } 9167c478bd9Sstevel@tonic-gate 9177c478bd9Sstevel@tonic-gate smbus->smbus_saved_w_resid = tp->i2c_w_resid; 9187c478bd9Sstevel@tonic-gate 9197c478bd9Sstevel@tonic-gate switch (tp->i2c_flags) { 9207c478bd9Sstevel@tonic-gate case I2C_WR: 9217c478bd9Sstevel@tonic-gate ret = smbus_wr(smbus); 9227c478bd9Sstevel@tonic-gate break; 9237c478bd9Sstevel@tonic-gate case I2C_RD: 9247c478bd9Sstevel@tonic-gate ret = smbus_rd(smbus); 9257c478bd9Sstevel@tonic-gate break; 9267c478bd9Sstevel@tonic-gate case I2C_WR_RD: 9277c478bd9Sstevel@tonic-gate /* 9287c478bd9Sstevel@tonic-gate * We could do a bit more decoding here, 9297c478bd9Sstevel@tonic-gate * to allow the transactions that would 9307c478bd9Sstevel@tonic-gate * work as a single smbus command to 9317c478bd9Sstevel@tonic-gate * be done as such. It's not really 9327c478bd9Sstevel@tonic-gate * worth the trouble. 9337c478bd9Sstevel@tonic-gate */ 9347c478bd9Sstevel@tonic-gate if (tp->i2c_w_resid > 0) { 9357c478bd9Sstevel@tonic-gate ret = smbus_wr(smbus); 9367c478bd9Sstevel@tonic-gate } else { 9377c478bd9Sstevel@tonic-gate ret = smbus_rd(smbus); 9387c478bd9Sstevel@tonic-gate } 9397c478bd9Sstevel@tonic-gate break; 9407c478bd9Sstevel@tonic-gate default: 9417c478bd9Sstevel@tonic-gate tp->i2c_result = I2C_FAILURE; 9427c478bd9Sstevel@tonic-gate ret = SMBUS_COMPLETE; 9437c478bd9Sstevel@tonic-gate break; 9447c478bd9Sstevel@tonic-gate } 9457c478bd9Sstevel@tonic-gate 9467c478bd9Sstevel@tonic-gate return (ret); 9477c478bd9Sstevel@tonic-gate } 9487c478bd9Sstevel@tonic-gate 9497c478bd9Sstevel@tonic-gate /* 9507c478bd9Sstevel@tonic-gate * 9517c478bd9Sstevel@tonic-gate */ 9527c478bd9Sstevel@tonic-gate static void 9537c478bd9Sstevel@tonic-gate smbus_intr_timeout(void *arg) 9547c478bd9Sstevel@tonic-gate { 9557c478bd9Sstevel@tonic-gate smbus_t *smbus = (smbus_t *)arg; 9567c478bd9Sstevel@tonic-gate 9577c478bd9Sstevel@tonic-gate mutex_enter(&smbus->smbus_imutex); 9587c478bd9Sstevel@tonic-gate /* 9597c478bd9Sstevel@tonic-gate * If timeout is already cleared, it means interrupt arrived 9607c478bd9Sstevel@tonic-gate * while timeout fired. In this case, just return from here. 9617c478bd9Sstevel@tonic-gate */ 9627c478bd9Sstevel@tonic-gate if (smbus->smbus_timeout == 0) { 9637c478bd9Sstevel@tonic-gate 9647c478bd9Sstevel@tonic-gate mutex_exit(&smbus->smbus_imutex); 9657c478bd9Sstevel@tonic-gate 9667c478bd9Sstevel@tonic-gate return; 9677c478bd9Sstevel@tonic-gate } 9687c478bd9Sstevel@tonic-gate 9697c478bd9Sstevel@tonic-gate (void) smbus_intr_cmn(smbus, SMBUS_TIMEOUT); 9707c478bd9Sstevel@tonic-gate mutex_exit(&smbus->smbus_imutex); 9717c478bd9Sstevel@tonic-gate } 9727c478bd9Sstevel@tonic-gate 9737c478bd9Sstevel@tonic-gate /* 9747c478bd9Sstevel@tonic-gate * smbus_intr() is the interrupt handler for smbus. 9757c478bd9Sstevel@tonic-gate */ 9767c478bd9Sstevel@tonic-gate static uint_t 9777c478bd9Sstevel@tonic-gate smbus_intr(caddr_t arg) 9787c478bd9Sstevel@tonic-gate { 9797c478bd9Sstevel@tonic-gate smbus_t *smbus = (smbus_t *)arg; 9807c478bd9Sstevel@tonic-gate uint32_t intr_status; 9817c478bd9Sstevel@tonic-gate uint_t result; 9827c478bd9Sstevel@tonic-gate 9837c478bd9Sstevel@tonic-gate /* 9847c478bd9Sstevel@tonic-gate * Check to see if intr is really from smbus 9857c478bd9Sstevel@tonic-gate */ 9867c478bd9Sstevel@tonic-gate intr_status = ddi_get32(smbus->smbus_confighandle, 9877c478bd9Sstevel@tonic-gate (uint32_t *)&smbus->smbus_configregaddr[SMBUS_SRC_STATUS]); 9887c478bd9Sstevel@tonic-gate 9897c478bd9Sstevel@tonic-gate 9907c478bd9Sstevel@tonic-gate if ((intr_status & SMBUS_SMB_INTR_STATUS) == 0) { 9917c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_INTR, "smbus_intr: intr not from smbus\n")); 9927c478bd9Sstevel@tonic-gate 9937c478bd9Sstevel@tonic-gate return (DDI_INTR_UNCLAIMED); 9947c478bd9Sstevel@tonic-gate } 9957c478bd9Sstevel@tonic-gate 9967c478bd9Sstevel@tonic-gate mutex_enter(&smbus->smbus_imutex); 9977c478bd9Sstevel@tonic-gate 9987c478bd9Sstevel@tonic-gate /* 9997c478bd9Sstevel@tonic-gate * If timeout is already cleared, it means it arrived before the intr. 10007c478bd9Sstevel@tonic-gate * In that case, just return from here. 10017c478bd9Sstevel@tonic-gate */ 10027c478bd9Sstevel@tonic-gate if (smbus->smbus_timeout == 0) { 10037c478bd9Sstevel@tonic-gate 10047c478bd9Sstevel@tonic-gate mutex_exit(&smbus->smbus_imutex); 10057c478bd9Sstevel@tonic-gate 10067c478bd9Sstevel@tonic-gate return (DDI_INTR_CLAIMED); 10077c478bd9Sstevel@tonic-gate } 10087c478bd9Sstevel@tonic-gate 10097c478bd9Sstevel@tonic-gate result = smbus_intr_cmn(smbus, SMBUS_INTR); 10107c478bd9Sstevel@tonic-gate mutex_exit(&smbus->smbus_imutex); 10117c478bd9Sstevel@tonic-gate return (result); 10127c478bd9Sstevel@tonic-gate } 10137c478bd9Sstevel@tonic-gate 10147c478bd9Sstevel@tonic-gate /* 10157c478bd9Sstevel@tonic-gate * smbus_intr() is the interrupt handler for smbus. 10167c478bd9Sstevel@tonic-gate */ 10177c478bd9Sstevel@tonic-gate static uint_t 10187c478bd9Sstevel@tonic-gate smbus_intr_cmn(smbus_t *smbus, char *src) 10197c478bd9Sstevel@tonic-gate { 10207c478bd9Sstevel@tonic-gate i2c_transfer_t *tp; 10217c478bd9Sstevel@tonic-gate char error_str[128]; 10227c478bd9Sstevel@tonic-gate uint8_t status; 10237c478bd9Sstevel@tonic-gate int ret = SMBUS_SUCCESS; 10247c478bd9Sstevel@tonic-gate timeout_id_t timer_id; 10257c478bd9Sstevel@tonic-gate 10267c478bd9Sstevel@tonic-gate ASSERT(mutex_owned(&smbus->smbus_imutex)); 10277c478bd9Sstevel@tonic-gate error_str[0] = '\0'; 10287c478bd9Sstevel@tonic-gate 10297c478bd9Sstevel@tonic-gate smbus_interrupts_off(smbus); 10307c478bd9Sstevel@tonic-gate 10317c478bd9Sstevel@tonic-gate tp = smbus->smbus_cur_tran; 10327c478bd9Sstevel@tonic-gate /* 10337c478bd9Sstevel@tonic-gate * This only happens when top half is interrupted or 10347c478bd9Sstevel@tonic-gate * times out, then the interrupt arrives. Interrupt 10357c478bd9Sstevel@tonic-gate * was already disabled by top half, so just exit. 10367c478bd9Sstevel@tonic-gate */ 10377c478bd9Sstevel@tonic-gate if (tp == NULL) { 10387c478bd9Sstevel@tonic-gate return (DDI_INTR_CLAIMED); 10397c478bd9Sstevel@tonic-gate } 10407c478bd9Sstevel@tonic-gate 10417c478bd9Sstevel@tonic-gate /* 10427c478bd9Sstevel@tonic-gate * This wait is required before reading the status, otherwise 10437c478bd9Sstevel@tonic-gate * a parity error can occur which causes a panic. A bug with 10447c478bd9Sstevel@tonic-gate * southbridge SMBUS. 10457c478bd9Sstevel@tonic-gate */ 10467c478bd9Sstevel@tonic-gate drv_usecwait(15); 10477c478bd9Sstevel@tonic-gate status = smbus_get(smbus, SMB_STS); 10487c478bd9Sstevel@tonic-gate if (smbus->smbus_polling) { 10497c478bd9Sstevel@tonic-gate /* 10507c478bd9Sstevel@tonic-gate * If we are polling, then we expect not to 10517c478bd9Sstevel@tonic-gate * get the right answer for a while, 10527c478bd9Sstevel@tonic-gate * so we don't go on to that error stuff 10537c478bd9Sstevel@tonic-gate * until we've polled the status for a 10547c478bd9Sstevel@tonic-gate * few times. We check for errors here to save time, 10557c478bd9Sstevel@tonic-gate * otherwise we would have to wait for the full 10567c478bd9Sstevel@tonic-gate * poll timeout before dealing with them. 10577c478bd9Sstevel@tonic-gate */ 10587c478bd9Sstevel@tonic-gate if (status != (CMD_CMPL|IDLE) && 10597c478bd9Sstevel@tonic-gate (status & (FAILED|BUS_ERR|DRV_ERR)) == 0 && 10607c478bd9Sstevel@tonic-gate smbus->smbus_poll_retries++ < SMBUS_POLL_MAX_RETRIES) { 10617c478bd9Sstevel@tonic-gate return (DDI_INTR_CLAIMED); 10627c478bd9Sstevel@tonic-gate } 10637c478bd9Sstevel@tonic-gate /* 10647c478bd9Sstevel@tonic-gate * else either ... 10657c478bd9Sstevel@tonic-gate * [] the command has completed, or; 10667c478bd9Sstevel@tonic-gate * [] There has been an error, or; 10677c478bd9Sstevel@tonic-gate * [] we timed out waiting for something useful 10687c478bd9Sstevel@tonic-gate * to happen, so we go on to to the error handling bit that 10697c478bd9Sstevel@tonic-gate * follows, * which will reset the controller then restart the 10707c478bd9Sstevel@tonic-gate * whole transaction. 10717c478bd9Sstevel@tonic-gate * 10727c478bd9Sstevel@tonic-gate * In all cases, clear "poll_retries" for the next command or 10737c478bd9Sstevel@tonic-gate * retry 10747c478bd9Sstevel@tonic-gate */ 10757c478bd9Sstevel@tonic-gate smbus->smbus_poll_retries = 0; 10767c478bd9Sstevel@tonic-gate } 10777c478bd9Sstevel@tonic-gate 10787c478bd9Sstevel@tonic-gate /* 10797c478bd9Sstevel@tonic-gate * A bug in southbridge SMBUS sometimes requires a reset. Status 10807c478bd9Sstevel@tonic-gate * should NOT be IDLE without any other bit set. If it is, the 10817c478bd9Sstevel@tonic-gate * transaction should be restarted. 10827c478bd9Sstevel@tonic-gate */ 10837c478bd9Sstevel@tonic-gate 10847c478bd9Sstevel@tonic-gate if (status == IDLE) { 10857c478bd9Sstevel@tonic-gate (void) sprintf(error_str, "%s bus is idle, ", error_str); 10867c478bd9Sstevel@tonic-gate } 10877c478bd9Sstevel@tonic-gate 10887c478bd9Sstevel@tonic-gate if ((status & CMD_CMPL) == 0) { 10897c478bd9Sstevel@tonic-gate (void) sprintf(error_str, "%s command failed to complete, ", 10907c478bd9Sstevel@tonic-gate error_str); 10917c478bd9Sstevel@tonic-gate } 10927c478bd9Sstevel@tonic-gate if (status & BUS_ERR) { 10937c478bd9Sstevel@tonic-gate (void) sprintf(error_str, "%s bus error, ", error_str); 10947c478bd9Sstevel@tonic-gate } 10957c478bd9Sstevel@tonic-gate if (status & FAILED) { 10967c478bd9Sstevel@tonic-gate (void) sprintf(error_str, "%s failed transaction, ", error_str); 10977c478bd9Sstevel@tonic-gate } 10987c478bd9Sstevel@tonic-gate if (status & DRV_ERR) { 10997c478bd9Sstevel@tonic-gate (void) sprintf(error_str, "%s timeout or bus reset", error_str); 11007c478bd9Sstevel@tonic-gate } 11017c478bd9Sstevel@tonic-gate 11027c478bd9Sstevel@tonic-gate if (error_str[0] != '\0') { 11037c478bd9Sstevel@tonic-gate (void) sprintf(error_str, "%s %s ", error_str, src); 11047c478bd9Sstevel@tonic-gate } 11057c478bd9Sstevel@tonic-gate 11067c478bd9Sstevel@tonic-gate /* 11077c478bd9Sstevel@tonic-gate * Clear status to clear the interrupt. 11087c478bd9Sstevel@tonic-gate */ 11097c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_STS, 0xff, SMBUS_FLUSH); 11107c478bd9Sstevel@tonic-gate if (error_str[0] != '\0') { 11117c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_TYP, KILL, SMBUS_FLUSH); 11127c478bd9Sstevel@tonic-gate if (smbus->smbus_retries++ < SMBUS_MAX_RETRIES) { 11137c478bd9Sstevel@tonic-gate /* 11147c478bd9Sstevel@tonic-gate * XXXX There was a panic here when the 11157c478bd9Sstevel@tonic-gate * intr timeout was greater than the timeout 11167c478bd9Sstevel@tonic-gate * for the entire transfer. 11177c478bd9Sstevel@tonic-gate * 11187c478bd9Sstevel@tonic-gate * Restore the value of w_resid before the 11197c478bd9Sstevel@tonic-gate * last transaction. r_resid doesn't need to 11207c478bd9Sstevel@tonic-gate * be restored because it is only decremented 11217c478bd9Sstevel@tonic-gate * after a successful read. Need to do this 11227c478bd9Sstevel@tonic-gate * here since smbus_switch() keys off of a 11237c478bd9Sstevel@tonic-gate * resid to know whether to call smbus_rd() or 11247c478bd9Sstevel@tonic-gate * smbus_wr(). 11257c478bd9Sstevel@tonic-gate */ 11267c478bd9Sstevel@tonic-gate tp->i2c_w_resid = smbus->smbus_saved_w_resid; 11277c478bd9Sstevel@tonic-gate smbus->smbus_bytes_to_read = 0; 11287c478bd9Sstevel@tonic-gate 11297c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_INTR_ERR, 11307c478bd9Sstevel@tonic-gate "retrying: %s %s w_resid=%d\n", error_str, 11317c478bd9Sstevel@tonic-gate src, tp->i2c_w_resid)); 11327c478bd9Sstevel@tonic-gate } else { 11337c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "%s max retries exceeded: %s", 11347c478bd9Sstevel@tonic-gate smbus->smbus_name, error_str); 11357c478bd9Sstevel@tonic-gate /* 11367c478bd9Sstevel@tonic-gate * bailing, but first will reset the bus. 11377c478bd9Sstevel@tonic-gate */ 11387c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_TYP, KILL, SMBUS_FLUSH); 11397c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_STS, 0xff, SMBUS_FLUSH); 11407c478bd9Sstevel@tonic-gate smbus->smbus_cur_tran->i2c_result = I2C_FAILURE; 11417c478bd9Sstevel@tonic-gate 11427c478bd9Sstevel@tonic-gate ret = SMBUS_FAILURE; 11437c478bd9Sstevel@tonic-gate } 11447c478bd9Sstevel@tonic-gate } else { 11457c478bd9Sstevel@tonic-gate smbus->smbus_retries = 0; 11467c478bd9Sstevel@tonic-gate } 11477c478bd9Sstevel@tonic-gate 11487c478bd9Sstevel@tonic-gate if (tp != NULL) { 11497c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_INTR, "flags=%d wresid=%d r_resid=%d %s\n", 11507c478bd9Sstevel@tonic-gate tp->i2c_flags, tp->i2c_w_resid, tp->i2c_r_resid, src)); 11517c478bd9Sstevel@tonic-gate } 11527c478bd9Sstevel@tonic-gate 11537c478bd9Sstevel@tonic-gate if (ret != SMBUS_FAILURE) { 11547c478bd9Sstevel@tonic-gate ret = smbus_switch(smbus); 11557c478bd9Sstevel@tonic-gate } 11567c478bd9Sstevel@tonic-gate 11577c478bd9Sstevel@tonic-gate if (smbus->smbus_polling) { 11587c478bd9Sstevel@tonic-gate if (ret == SMBUS_COMPLETE || ret == SMBUS_FAILURE) { 11597c478bd9Sstevel@tonic-gate smbus->smbus_poll_complete = 1; 11607c478bd9Sstevel@tonic-gate } 11617c478bd9Sstevel@tonic-gate } else { 11627c478bd9Sstevel@tonic-gate /* 11637c478bd9Sstevel@tonic-gate * Disable previous timeout. In case it was about to fire this 11647c478bd9Sstevel@tonic-gate * will let it exit without doing anything. 11657c478bd9Sstevel@tonic-gate */ 11667c478bd9Sstevel@tonic-gate timer_id = smbus->smbus_timeout; 11677c478bd9Sstevel@tonic-gate smbus->smbus_timeout = 0; 11687c478bd9Sstevel@tonic-gate mutex_exit(&smbus->smbus_imutex); 11697c478bd9Sstevel@tonic-gate (void) untimeout(timer_id); 11707c478bd9Sstevel@tonic-gate mutex_enter(&smbus->smbus_imutex); 11717c478bd9Sstevel@tonic-gate if (ret == SMBUS_COMPLETE || ret == SMBUS_FAILURE) { 11727c478bd9Sstevel@tonic-gate cv_signal(&smbus->smbus_icv); 11737c478bd9Sstevel@tonic-gate } else { 11747c478bd9Sstevel@tonic-gate smbus_interrupts_on(smbus); 11757c478bd9Sstevel@tonic-gate smbus->smbus_timeout = timeout(smbus_intr_timeout, 11767c478bd9Sstevel@tonic-gate smbus, drv_usectohz(intr_timeout)); 11777c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_INTR, "smbus_intr starting timeout %p " 11787c478bd9Sstevel@tonic-gate "%s", smbus->smbus_timeout, src)); 11797c478bd9Sstevel@tonic-gate } 11807c478bd9Sstevel@tonic-gate } 11817c478bd9Sstevel@tonic-gate 11827c478bd9Sstevel@tonic-gate return (DDI_INTR_CLAIMED); 11837c478bd9Sstevel@tonic-gate } 11847c478bd9Sstevel@tonic-gate 11857c478bd9Sstevel@tonic-gate /* 11867c478bd9Sstevel@tonic-gate * smbus_wr handles writes to the smbus. Unlike true I2C busses 11877c478bd9Sstevel@tonic-gate * such as provided by pcf8584, smbus attaches a start and stop bit for each 11887c478bd9Sstevel@tonic-gate * transaction, so this limits writes to the maximum number of bytes 11897c478bd9Sstevel@tonic-gate * in a single transaction, which is 33. 11907c478bd9Sstevel@tonic-gate * 11917c478bd9Sstevel@tonic-gate * If more than 33 bytes are contained in the transfer, a non-zero 11927c478bd9Sstevel@tonic-gate * residual has to be returned, and the calling driver has to restart 11937c478bd9Sstevel@tonic-gate * another transaction to complete writing out any remaining data. The 11947c478bd9Sstevel@tonic-gate * reason for this is that most devices require a register/offset as the 11957c478bd9Sstevel@tonic-gate * first byte to be written for each SMBUS transaction. 11967c478bd9Sstevel@tonic-gate */ 11977c478bd9Sstevel@tonic-gate static int 11987c478bd9Sstevel@tonic-gate smbus_wr(smbus_t *smbus) 11997c478bd9Sstevel@tonic-gate { 12007c478bd9Sstevel@tonic-gate i2c_transfer_t *tp = smbus->smbus_cur_tran; 12017c478bd9Sstevel@tonic-gate uint8_t addr = smbus_dip_to_addr(smbus->smbus_cur_dip); 12027c478bd9Sstevel@tonic-gate int bytes_written = 0; 12037c478bd9Sstevel@tonic-gate uint8_t a; 12047c478bd9Sstevel@tonic-gate uint8_t b; 12057c478bd9Sstevel@tonic-gate 12067c478bd9Sstevel@tonic-gate if (tp->i2c_w_resid != tp->i2c_wlen) { 12077c478bd9Sstevel@tonic-gate return (SMBUS_COMPLETE); 12087c478bd9Sstevel@tonic-gate } 12097c478bd9Sstevel@tonic-gate 12107c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_WR, "smbus_wr: addr = %x resid = %d\n", 12117c478bd9Sstevel@tonic-gate addr, tp->i2c_w_resid)); 12127c478bd9Sstevel@tonic-gate 12137c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_STS, 0xff, 0); 12147c478bd9Sstevel@tonic-gate 12157c478bd9Sstevel@tonic-gate /* 12167c478bd9Sstevel@tonic-gate * Address must be re-written for each command and it has to 12177c478bd9Sstevel@tonic-gate * be written before SMB_TYP. 12187c478bd9Sstevel@tonic-gate */ 12197c478bd9Sstevel@tonic-gate smbus_put(smbus, DEV_ADDR, addr, 0); 12207c478bd9Sstevel@tonic-gate 12217c478bd9Sstevel@tonic-gate switch (tp->i2c_w_resid) { 12227c478bd9Sstevel@tonic-gate 12237c478bd9Sstevel@tonic-gate case 1: 12247c478bd9Sstevel@tonic-gate a = tp->i2c_wbuf[tp->i2c_wlen - tp->i2c_w_resid--]; 12257c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_CMD, a, 0); 12267c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_TYP, SEND_BYTE, 0); 12277c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_WR, "smbus_wr: send one byte:" 12287c478bd9Sstevel@tonic-gate " %d\n", a)); 12297c478bd9Sstevel@tonic-gate break; 12307c478bd9Sstevel@tonic-gate case 2: 12317c478bd9Sstevel@tonic-gate a = tp->i2c_wbuf[tp->i2c_wlen - tp->i2c_w_resid--]; 12327c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_CMD, a, 0); 12337c478bd9Sstevel@tonic-gate 12347c478bd9Sstevel@tonic-gate b = tp->i2c_wbuf[tp->i2c_wlen - tp->i2c_w_resid--]; 12357c478bd9Sstevel@tonic-gate smbus_put(smbus, DEV_DATA0, b, 0); 12367c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_TYP, WR_BYTE, 0); 12377c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_WR, "smbus_wr: send two bytes:" 12387c478bd9Sstevel@tonic-gate " %d %d\n", a, b)); 12397c478bd9Sstevel@tonic-gate break; 12407c478bd9Sstevel@tonic-gate 12417c478bd9Sstevel@tonic-gate default: 12427c478bd9Sstevel@tonic-gate /* 12437c478bd9Sstevel@tonic-gate * Write out as many bytes as possible in a single command. 12447c478bd9Sstevel@tonic-gate * Note that BLK_DATA just creats a byte stream. ie, the 12457c478bd9Sstevel@tonic-gate * smbus protocol is not used or interpreted by this driver. 12467c478bd9Sstevel@tonic-gate */ 12477c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_TYP, WR_BLK, 0); 12487c478bd9Sstevel@tonic-gate a = tp->i2c_wbuf[tp->i2c_wlen - tp->i2c_w_resid--]; 12497c478bd9Sstevel@tonic-gate 12507c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_CMD, a, 0); 12517c478bd9Sstevel@tonic-gate 12527c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_WR, "smbus_wr: send multiple bytes: ")); 12537c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_WR, "%x ", a)); 12547c478bd9Sstevel@tonic-gate 12557c478bd9Sstevel@tonic-gate while (tp->i2c_w_resid != 0) { 12567c478bd9Sstevel@tonic-gate a = tp->i2c_wbuf[tp->i2c_wlen - tp->i2c_w_resid--]; 12577c478bd9Sstevel@tonic-gate smbus_put(smbus, BLK_DATA, a, 0); 12587c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_WR, "%x ", a)); 12597c478bd9Sstevel@tonic-gate /* 12607c478bd9Sstevel@tonic-gate * Note that MAX_BLK_SEND defines how many bytes may 12617c478bd9Sstevel@tonic-gate * be sent to the BLK_DATA register. The leading byte 12627c478bd9Sstevel@tonic-gate * already sent to the SMB_CMD register doesn't count 12637c478bd9Sstevel@tonic-gate * But ALL the BLK_DATA bytes count so pre-increment 12647c478bd9Sstevel@tonic-gate * bytes_written before testing. 12657c478bd9Sstevel@tonic-gate */ 12667c478bd9Sstevel@tonic-gate if (++bytes_written == MAX_BLK_SEND) { 12677c478bd9Sstevel@tonic-gate break; 12687c478bd9Sstevel@tonic-gate } 12697c478bd9Sstevel@tonic-gate } 12707c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_WR, "\n")); 12717c478bd9Sstevel@tonic-gate smbus_put(smbus, DEV_DATA0, bytes_written, 0); 12727c478bd9Sstevel@tonic-gate break; 12737c478bd9Sstevel@tonic-gate } 12747c478bd9Sstevel@tonic-gate 12757c478bd9Sstevel@tonic-gate /* 12767c478bd9Sstevel@tonic-gate * writing anything to port reg starts transfer 12777c478bd9Sstevel@tonic-gate */ 12787c478bd9Sstevel@tonic-gate smbus_put(smbus, STR_PORT, 0, SMBUS_FLUSH); 12797c478bd9Sstevel@tonic-gate 12807c478bd9Sstevel@tonic-gate return (SMBUS_PENDING); 12817c478bd9Sstevel@tonic-gate } 12827c478bd9Sstevel@tonic-gate 12837c478bd9Sstevel@tonic-gate /* 12847c478bd9Sstevel@tonic-gate * smbus_rd handles reads to the smbus. Unlike a true I2C bus 12857c478bd9Sstevel@tonic-gate * such as provided by pcf8584, smbus attaches a start and stop bit 12867c478bd9Sstevel@tonic-gate * for each transaction, which limits reads to the maximum number of 12877c478bd9Sstevel@tonic-gate * bytes in a single SMBUS transaction. (Block reads don't 12887c478bd9Sstevel@tonic-gate * seem to work on smbus, and the southbridge documentation is poor). 12897c478bd9Sstevel@tonic-gate * 12907c478bd9Sstevel@tonic-gate * It doesn't appear that reads spanning multiple I2C transactions 12917c478bd9Sstevel@tonic-gate * (ie each with a start-stop) affects the transfer when reading 12927c478bd9Sstevel@tonic-gate * multiple bytes from devices with internal counters. The counter 12937c478bd9Sstevel@tonic-gate * is correctly maintained. 12947c478bd9Sstevel@tonic-gate * 12957c478bd9Sstevel@tonic-gate * RD_WORD and RD_BYTE write out the byte in the SMB_CMD register 12967c478bd9Sstevel@tonic-gate * before reading, so RCV_BYTE is used instead. 12977c478bd9Sstevel@tonic-gate * 12987c478bd9Sstevel@tonic-gate * Multi-byte reads iniatiate a SMBUS transaction for each byte to be 12997c478bd9Sstevel@tonic-gate * received. Because register/offset information doesn't need to 13007c478bd9Sstevel@tonic-gate * be resent for each I2C transaction (as opposed to when writing data), 13017c478bd9Sstevel@tonic-gate * the driver can continue reading data in separate SMBUS transactions 13027c478bd9Sstevel@tonic-gate * until the requested buffer is filled. 13037c478bd9Sstevel@tonic-gate */ 13047c478bd9Sstevel@tonic-gate static int 13057c478bd9Sstevel@tonic-gate smbus_rd(smbus_t *smbus) 13067c478bd9Sstevel@tonic-gate { 13077c478bd9Sstevel@tonic-gate i2c_transfer_t *tp = smbus->smbus_cur_tran; 13087c478bd9Sstevel@tonic-gate uint8_t addr = smbus_dip_to_addr(smbus->smbus_cur_dip); 13097c478bd9Sstevel@tonic-gate 13107c478bd9Sstevel@tonic-gate if (smbus->smbus_bytes_to_read == 1) { 13117c478bd9Sstevel@tonic-gate tp->i2c_rbuf[tp->i2c_rlen - tp->i2c_r_resid] = 13127c478bd9Sstevel@tonic-gate smbus_get(smbus, DEV_DATA0); 13137c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_RD, "smbus_rd: data in = %d\n", 13147c478bd9Sstevel@tonic-gate tp->i2c_rbuf[tp->i2c_rlen - tp->i2c_r_resid])); 13157c478bd9Sstevel@tonic-gate tp->i2c_r_resid--; 13167c478bd9Sstevel@tonic-gate smbus->smbus_bytes_to_read = 0; 13177c478bd9Sstevel@tonic-gate 13187c478bd9Sstevel@tonic-gate if (tp->i2c_r_resid == 0) { 13197c478bd9Sstevel@tonic-gate return (SMBUS_COMPLETE); 13207c478bd9Sstevel@tonic-gate } 13217c478bd9Sstevel@tonic-gate } 13227c478bd9Sstevel@tonic-gate 13237c478bd9Sstevel@tonic-gate /* 13247c478bd9Sstevel@tonic-gate * Address must be re-written for each command. It must 13257c478bd9Sstevel@tonic-gate * be written before SMB_TYP. 13267c478bd9Sstevel@tonic-gate */ 13277c478bd9Sstevel@tonic-gate smbus_put(smbus, DEV_ADDR, addr | I2C_READ, 0); 13287c478bd9Sstevel@tonic-gate 13297c478bd9Sstevel@tonic-gate if (tp->i2c_r_resid == 0) { 13307c478bd9Sstevel@tonic-gate smbus->smbus_bytes_to_read = 0; 13317c478bd9Sstevel@tonic-gate 13327c478bd9Sstevel@tonic-gate return (SMBUS_COMPLETE); 13337c478bd9Sstevel@tonic-gate } 13347c478bd9Sstevel@tonic-gate 13357c478bd9Sstevel@tonic-gate smbus->smbus_bytes_to_read = 1; 13367c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_TYP, RCV_BYTE, 0); 13377c478bd9Sstevel@tonic-gate 13387c478bd9Sstevel@tonic-gate smbus_put(smbus, SMB_STS, 0xff, 0); 13397c478bd9Sstevel@tonic-gate 13407c478bd9Sstevel@tonic-gate SMBUS_PRINT((PRT_RD, "smbus_rd: starting a read addr = %x resid = %d " 13417c478bd9Sstevel@tonic-gate "bytes_to_read=%d\n", addr, tp->i2c_r_resid, 13427c478bd9Sstevel@tonic-gate smbus->smbus_bytes_to_read)); 13437c478bd9Sstevel@tonic-gate 13447c478bd9Sstevel@tonic-gate smbus_put(smbus, STR_PORT, 0, SMBUS_FLUSH); 13457c478bd9Sstevel@tonic-gate 13467c478bd9Sstevel@tonic-gate return (SMBUS_PENDING); 13477c478bd9Sstevel@tonic-gate } 1348