include/hw/misc/auxbus.h

   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 The 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 */