1/* 2 * aux.h 3 * 4 * Copyright (C)2014 : GreenSocs Ltd 5 * http://www.greensocs.com/ , email: info@greensocs.com 6 * 7 * Developed by : 8 * Frederic Konrad <fred.konrad@greensocs.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation, either version 2 of the License, or 13 * (at your option)any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License along 21 * with this program; if not, see <http://www.gnu.org/licenses/>. 22 * 23 */ 24 25#ifndef QEMU_AUX_H 26#define QEMU_AUX_H 27 28#include "hw/qdev.h" 29 30typedef struct AUXBus AUXBus; 31typedef struct AUXSlave AUXSlave; 32typedef enum AUXCommand AUXCommand; 33typedef enum AUXReply AUXReply; 34typedef struct AUXTOI2CState AUXTOI2CState; 35 36enum AUXCommand { 37 WRITE_I2C = 0, 38 READ_I2C = 1, 39 WRITE_I2C_STATUS = 2, 40 WRITE_I2C_MOT = 4, 41 READ_I2C_MOT = 5, 42 WRITE_AUX = 8, 43 READ_AUX = 9 44}; 45 46enum AUXReply { 47 AUX_I2C_ACK = 0, 48 AUX_NACK = 1, 49 AUX_DEFER = 2, 50 AUX_I2C_NACK = 4, 51 AUX_I2C_DEFER = 8 52}; 53 54struct AUXBus { 55 /* < private > */ 56 BusState qbus; 57 /* < public > */ 58 AUXSlave *current_dev; 59 AUXSlave *dev; 60 uint32_t last_i2c_address; 61 AUXCommand last_transaction; 62 63 AUXTOI2CState *bridge; 64 65 MemoryRegion *aux_io; 66 AddressSpace aux_addr_space; 67}; 68 69#define TYPE_AUX_SLAVE "aux-slave" 70#define AUX_SLAVE(obj) \ 71 OBJECT_CHECK(AUXSlave, (obj), TYPE_AUX_SLAVE) 72 73struct AUXSlave { 74 /* < private > */ 75 DeviceState parent_obj; 76 77 /* < public > */ 78 MemoryRegion *mmio; 79}; 80 81/** 82 * aux_init_bus: Initialize an AUX bus. 83 * 84 * Returns the new AUX bus created. 85 * 86 * @parent The device where this bus is located. 87 * @name The name of the bus. 88 */ 89AUXBus *aux_init_bus(DeviceState *parent, const char *name); 90 91/* 92 * aux_request: Make a request on the bus. 93 * 94 * Returns the reply of the request. 95 * 96 * @bus Ths bus where the request happen. 97 * @cmd The command requested. 98 * @address The 20bits address of the slave. 99 * @len The length of the read or write. 100 * @data The data array which will be filled or read during transfer. 101 */ 102AUXReply aux_request(AUXBus *bus, AUXCommand cmd, uint32_t address, 103 uint8_t len, uint8_t *data); 104 105/* 106 * aux_get_i2c_bus: Get the i2c bus for I2C over AUX command. 107 * 108 * Returns the i2c bus associated to this AUX bus. 109 * 110 * @bus The AUX bus. 111 */ 112I2CBus *aux_get_i2c_bus(AUXBus *bus); 113 114/* 115 * aux_init_mmio: Init an mmio for an AUX slave. 116 * 117 * @aux_slave The AUX slave. 118 * @mmio The mmio to be registered. 119 */ 120void aux_init_mmio(AUXSlave *aux_slave, MemoryRegion *mmio); 121 122DeviceState *aux_create_slave(AUXBus *bus, const char *name, uint32_t addr); 123 124#endif /* !QEMU_AUX_H */ 125