1 /* 2 * auxbus.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 HW_MISC_AUXBUS_H 26 #define HW_MISC_AUXBUS_H 27 28 #include "exec/memory.h" 29 #include "hw/qdev-core.h" 30 #include "qom/object.h" 31 32 typedef struct AUXSlave AUXSlave; 33 typedef enum AUXCommand AUXCommand; 34 typedef enum AUXReply AUXReply; 35 36 #define TYPE_AUXTOI2C "aux-to-i2c-bridge" 37 OBJECT_DECLARE_SIMPLE_TYPE(AUXTOI2CState, AUXTOI2C) 38 39 enum AUXCommand { 40 WRITE_I2C = 0, 41 READ_I2C = 1, 42 WRITE_I2C_STATUS = 2, 43 WRITE_I2C_MOT = 4, 44 READ_I2C_MOT = 5, 45 WRITE_AUX = 8, 46 READ_AUX = 9 47 }; 48 49 enum AUXReply { 50 AUX_I2C_ACK = 0, 51 AUX_NACK = 1, 52 AUX_DEFER = 2, 53 AUX_I2C_NACK = 4, 54 AUX_I2C_DEFER = 8 55 }; 56 57 #define TYPE_AUX_BUS "aux-bus" 58 OBJECT_DECLARE_SIMPLE_TYPE(AUXBus, AUX_BUS) 59 60 struct AUXBus { 61 /* < private > */ 62 BusState qbus; 63 64 /* < public > */ 65 AUXSlave *current_dev; 66 AUXSlave *dev; 67 uint32_t last_i2c_address; 68 AUXCommand last_transaction; 69 70 AUXTOI2CState *bridge; 71 72 MemoryRegion *aux_io; 73 AddressSpace aux_addr_space; 74 }; 75 76 #define TYPE_AUX_SLAVE "aux-slave" 77 OBJECT_DECLARE_SIMPLE_TYPE(AUXSlave, AUX_SLAVE) 78 79 struct AUXSlave { 80 /* < private > */ 81 DeviceState parent_obj; 82 83 /* < public > */ 84 MemoryRegion *mmio; 85 }; 86 87 /** 88 * aux_bus_init: Initialize an AUX bus. 89 * 90 * Returns the new AUX bus created. 91 * 92 * @parent The device where this bus is located. 93 * @name The name of the bus. 94 */ 95 AUXBus *aux_bus_init(DeviceState *parent, const char *name); 96 97 /** 98 * aux_bus_realize: Realize an AUX bus. 99 * 100 * @bus: The AUX bus. 101 */ 102 void aux_bus_realize(AUXBus *bus); 103 104 /* 105 * aux_request: Make a request on the bus. 106 * 107 * Returns the reply of the request. 108 * 109 * @bus Ths bus where the request happen. 110 * @cmd The command requested. 111 * @address The 20bits address of the slave. 112 * @len The length of the read or write. 113 * @data The data array which will be filled or read during transfer. 114 */ 115 AUXReply aux_request(AUXBus *bus, AUXCommand cmd, uint32_t address, 116 uint8_t len, uint8_t *data); 117 118 /* 119 * aux_get_i2c_bus: Get the i2c bus for I2C over AUX command. 120 * 121 * Returns the i2c bus associated to this AUX bus. 122 * 123 * @bus The AUX bus. 124 */ 125 I2CBus *aux_get_i2c_bus(AUXBus *bus); 126 127 /* 128 * aux_init_mmio: Init an mmio for an AUX slave. 129 * 130 * @aux_slave The AUX slave. 131 * @mmio The mmio to be registered. 132 */ 133 void aux_init_mmio(AUXSlave *aux_slave, MemoryRegion *mmio); 134 135 /* aux_map_slave: Map the mmio for an AUX slave on the bus. 136 * 137 * @dev The AUX slave. 138 * @addr The address for the slave's mmio. 139 */ 140 void aux_map_slave(AUXSlave *dev, hwaddr addr); 141 142 #endif /* HW_MISC_AUXBUS_H */ 143