Re: [Qemu-devel] [PATCH V6 2/8] introduce aux-bus

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Re: [Qemu-devel] [PATCH V6 2/8] introduce aux-bus

From:	Peter Crosthwaite
Subject:	Re: [Qemu-devel] [PATCH V6 2/8] introduce aux-bus
Date:	Thu, 14 Jan 2016 13:09:04 -0800

On Thu, Jan 14, 2016 at 1:57 AM, KONRAD Frederic
<address@hidden> wrote:
>
>
> Le 13/01/2016 22:02, Peter Crosthwaite a écrit :
>>
>> On Mon, Jan 4, 2016 at 10:25 AM,  <address@hidden> wrote:
>>>
>>> From: KONRAD Frederic <address@hidden>
>>>
>>> This introduces a new bus: aux-bus.
>>>
>>> It contains an address space for aux slaves devices and a bridge to an
>>> I2C bus
>>> for I2C through AUX transactions.
>>>
>>> Signed-off-by: KONRAD Frederic <address@hidden>
>>> Tested-By: Hyun Kwon <address@hidden>
>>> ---
>>>   default-configs/aarch64-softmmu.mak |   1 +
>>>   hw/misc/Makefile.objs               |   1 +
>>>   hw/misc/aux.c                       | 348
>>> ++++++++++++++++++++++++++++++++++++
>>>   include/hw/misc/aux.h               | 124 +++++++++++++
>>>   4 files changed, 474 insertions(+)
>>>   create mode 100644 hw/misc/aux.c
>>>   create mode 100644 include/hw/misc/aux.h
>>>
>>> diff --git a/default-configs/aarch64-softmmu.mak
>>> b/default-configs/aarch64-softmmu.mak
>>> index 96dd994..d3a2665 100644
>>> --- a/default-configs/aarch64-softmmu.mak
>>> +++ b/default-configs/aarch64-softmmu.mak
>>> @@ -3,4 +3,5 @@
>>>   # We support all the 32 bit boards so need all their config
>>>   include arm-softmmu.mak
>>>
>>> +CONFIG_AUX=y
>>>   CONFIG_XLNX_ZYNQMP=y
>>> diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
>>> index d4765c2..4af5fbe 100644
>>> --- a/hw/misc/Makefile.objs
>>> +++ b/hw/misc/Makefile.objs
>>> @@ -44,3 +44,4 @@ obj-$(CONFIG_STM32F2XX_SYSCFG) += stm32f2xx_syscfg.o
>>>   obj-$(CONFIG_PVPANIC) += pvpanic.o
>>>   obj-$(CONFIG_EDU) += edu.o
>>>   obj-$(CONFIG_HYPERV_TESTDEV) += hyperv_testdev.o
>>> +obj-$(CONFIG_AUX) += aux.o
>>> diff --git a/hw/misc/aux.c b/hw/misc/aux.c
>>> new file mode 100644
>>> index 0000000..cdfec67
>>> --- /dev/null
>>> +++ b/hw/misc/aux.c
>>> @@ -0,0 +1,348 @@
>>> +/*
>>> + * aux.c
>>> + *
>>> + *  Copyright 2015 : GreenSocs Ltd
>>> + *      http://www.greensocs.com/ , email: address@hidden
>>> + *
>>> + *  Developed by :
>>> + *  Frederic Konrad   <address@hidden>
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License as published by
>>> + * the Free Software Foundation, either version 2 of the License, or
>>> + * (at your option)any later version.
>>> + *
>>> + * This program is distributed in the hope that it will be useful,
>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>> + * GNU General Public License for more details.
>>> + *
>>> + * You should have received a copy of the GNU General Public License
>>> along
>>> + * with this program; if not, see <http://www.gnu.org/licenses/>.
>>> + *
>>> + */
>>> +
>>> +/*
>>> + * This is an implementation of the AUX bus for VESA Display Port v1.1a.
>>> + */
>>> +
>>> +#include "hw/misc/aux.h"
>>> +#include "hw/i2c/i2c.h"
>>> +#include "monitor/monitor.h"
>>> +
>>> +#ifndef DEBUG_AUX
>>> +#define DEBUG_AUX 0
>>> +#endif
>>> +
>>> +#define DPRINTF(fmt, ...) do {
>>> \
>>> +    if (DEBUG_AUX) {
>>> \
>>> +        qemu_log("aux: " fmt , ## __VA_ARGS__);
>>> \
>>> +    }
>>> \
>>> +} while (0);
>>> +
>>> +#define TYPE_AUXTOI2C "aux-to-i2c-bridge"
>>> +#define AUXTOI2C(obj) OBJECT_CHECK(AUXTOI2CState, (obj), TYPE_AUXTOI2C)
>>> +
>>> +#define TYPE_AUX_BUS "aux-bus"
>>> +#define AUX_BUS(obj) OBJECT_CHECK(AUXBus, (obj), TYPE_AUX_BUS)
>>> +
>>> +static void aux_slave_dev_print(Monitor *mon, DeviceState *dev, int
>>> indent);
>>> +
>>> +static void aux_bus_class_init(ObjectClass *klass, void *data)
>>> +{
>>> +    BusClass *k = BUS_CLASS(klass);
>>> +
>>> +    /* AUXSlave has an MMIO so we need to change the way we print
>>> information
>>> +     * in monitor.
>>> +     */
>>> +    k->print_dev = aux_slave_dev_print;
>>> +}
>>> +
>>> +static const TypeInfo aux_bus_info = {
>>> +    .name = TYPE_AUX_BUS,
>>> +    .parent = TYPE_BUS,
>>> +    .instance_size = sizeof(AUXBus),
>>> +    .class_init = aux_bus_class_init
>>> +};
>>> +
>>> +AUXBus *aux_init_bus(DeviceState *parent, const char *name)
>>> +{
>>> +    AUXBus *bus;
>>> +
>>> +    bus = AUX_BUS(qbus_create(TYPE_AUX_BUS, parent, name));
>>> +    bus->bridge = AUXTOI2C(qdev_create(BUS(bus), TYPE_AUXTOI2C));
>>> +
>>> +    /* Memory related. */
>>> +    bus->aux_io = g_malloc(sizeof(*bus->aux_io));
>>> +    memory_region_init(bus->aux_io, OBJECT(bus), "aux-io", (1 << 20));
>>> +    address_space_init(&bus->aux_addr_space, bus->aux_io, "aux-io");
>>> +    return bus;
>>> +}
>>> +
>>> +static void aux_bus_map_device(AUXBus *bus, AUXSlave *dev, hwaddr addr)
>>> +{
>>> +    memory_region_add_subregion(bus->aux_io, addr, dev->mmio);
>>> +}
>>> +
>>> +static bool aux_bus_is_bridge(AUXBus *bus, DeviceState *dev)
>>> +{
>>> +    return (dev == DEVICE(bus->bridge));
>>> +}
>>> +
>>> +AUXReply aux_request(AUXBus *bus, AUXCommand cmd, uint32_t address,
>>> +                      uint8_t len, uint8_t *data)
>>> +{
>>> +    int temp;
>>> +    AUXReply ret = AUX_NACK;
>>> +    I2CBus *i2c_bus = aux_get_i2c_bus(bus);
>>> +    size_t i;
>>> +    bool is_write = false;
>>> +
>>> +    DPRINTF("request at address 0x%" PRIX32 ", command %u, len %u\n",
>>> address,
>>> +            cmd, len);
>>> +
>>> +    switch (cmd) {
>>> +    /*
>>> +     * Forward the request on the AUX bus..
>>> +     */
>>> +    case WRITE_AUX:
>>> +        is_write = true;
>>> +        /* fallthrough */
>>> +    case READ_AUX:
>>> +        for (i = 0; i < len; i++) {
>>> +            if (!address_space_rw(&bus->aux_addr_space, address++,
>>> +                                  MEMTXATTRS_UNSPECIFIED, data++, 1,
>>> +                                  is_write)) {
>>> +                ret = AUX_I2C_ACK;
>>> +            } else {
>>> +                ret = AUX_NACK;
>>> +                break;
>>> +            }
>>> +        }
>>> +        break;
>>> +    /*
>>> +     * Classic I2C transactions..
>>> +     */
>>> +    case READ_I2C:
>>> +        if (i2c_bus_busy(i2c_bus)) {
>>> +            i2c_end_transfer(i2c_bus);
>>> +        }
>>> +
>>> +        if (i2c_start_transfer(i2c_bus, address, 1)) {
>>> +            ret = AUX_I2C_NACK;
>>> +            break;
>>> +        }
>>> +
>>> +        ret = AUX_I2C_ACK;
>>> +        while (len > 0) {
>>> +            temp = i2c_recv(i2c_bus);
>>> +
>>> +            if (temp < 0) {
>>> +                ret = AUX_I2C_NACK;
>>> +                break;
>>> +            }
>>> +
>>> +            *data++ = temp;
>>> +            len--;
>>> +        }
>>> +        i2c_end_transfer(i2c_bus);
>>> +        break;
>>> +    case WRITE_I2C:
>>> +        if (i2c_bus_busy(i2c_bus)) {
>>> +            i2c_end_transfer(i2c_bus);
>>> +        }
>>> +
>>> +        if (i2c_start_transfer(i2c_bus, address, 0)) {
>>> +            ret = AUX_I2C_NACK;
>>> +            break;
>>> +        }
>>> +
>>> +        ret = AUX_I2C_ACK;
>>> +        while (len > 0) {
>>> +            if (!i2c_send(i2c_bus, *data++)) {
>>> +                ret = AUX_I2C_NACK;
>>> +                break;
>>> +            }
>>> +            len--;
>>> +        }
>>> +        i2c_end_transfer(i2c_bus);
>>> +        break;
>>
>> This is still mostly duplicated code. The unification suggested in V5
>> did not work?
>
> Hi Peter,
>
> Hmmm sorry missed this fix..
> Is your patch upstreamed?
>

No not yet.

Regards,
Peter

> Thanks,
> Fred
>
>>
>> Regards,
>> Peter
>>
>>> +    /*
>>> +     * I2C MOT transactions.
>>> +     *
>>> +     * Here we send a start when:
>>> +     *  - We didn't start transaction yet.
>>> +     *  - We had a READ and we do a WRITE.
>>> +     *  - We changed the address.
>>> +     */
>>> +    case WRITE_I2C_MOT:
>>> +        if (!i2c_bus_busy(i2c_bus)) {
>>> +            /*
>>> +             * No transactions started..
>>> +             */
>>> +            if (i2c_start_transfer(i2c_bus, address, 0)) {
>>> +                ret = AUX_I2C_NACK;
>>> +                break;
>>> +            }
>>> +        } else if ((address != bus->last_i2c_address) ||
>>> +                   (bus->last_transaction == READ_I2C_MOT)) {
>>> +            /*
>>> +             * Transaction started but we need to restart..
>>> +             */
>>> +            i2c_end_transfer(i2c_bus);
>>> +            if (i2c_start_transfer(i2c_bus, address, 0)) {
>>> +                ret = AUX_I2C_NACK;
>>> +                break;
>>> +            }
>>> +        }
>>> +
>>> +        while (len > 0) {
>>> +            if (!i2c_send(i2c_bus, *data++)) {
>>> +                ret = AUX_I2C_NACK;
>>> +                i2c_end_transfer(i2c_bus);
>>> +                break;
>>> +            }
>>> +            len--;
>>> +        }
>>> +        bus->last_transaction = WRITE_I2C_MOT;
>>> +        bus->last_i2c_address = address;
>>> +        ret = AUX_I2C_ACK;
>>> +        break;
>>> +    case READ_I2C_MOT:
>>> +        if (!i2c_bus_busy(i2c_bus)) {
>>> +            /*
>>> +             * No transactions started..
>>> +             */
>>> +            if (i2c_start_transfer(i2c_bus, address, 1)) {
>>> +                ret = AUX_I2C_NACK;
>>> +                break;
>>> +            }
>>> +        } else if (address != bus->last_i2c_address) {
>>> +            /*
>>> +             * Transaction started but we need to restart..
>>> +             */
>>> +            i2c_end_transfer(i2c_bus);
>>> +            if (i2c_start_transfer(i2c_bus, address, 1)) {
>>> +                ret = AUX_I2C_NACK;
>>> +                break;
>>> +            }
>>> +        }
>>> +
>>> +        while (len > 0) {
>>> +            temp = i2c_recv(i2c_bus);
>>> +
>>> +            if (temp < 0) {
>>> +                ret = AUX_I2C_NACK;
>>> +                i2c_end_transfer(i2c_bus);
>>> +                break;
>>> +            }
>>> +
>>> +            *data++ = temp;
>>> +            len--;
>>> +        }
>>> +        bus->last_transaction = READ_I2C_MOT;
>>> +        bus->last_i2c_address = address;
>>> +        ret = AUX_I2C_ACK;
>>> +        break;
>>> +    default:
>>> +        DPRINTF("Not implemented!\n");
>>> +        ret = AUX_NACK;
>>> +        break;
>>> +    }
>>> +
>>> +    DPRINTF("reply: %u\n", ret);
>>> +    return ret;
>>> +}
>>> +
>>> +/*
>>> + * AUX to I2C bridge.
>>> + */
>>> +struct AUXTOI2CState {
>>> +    /*< private >*/
>>> +    DeviceState parent_obj;
>>> +    /*< public >*/
>>> +    I2CBus *i2c_bus;
>>> +};
>>> +
>>> +I2CBus *aux_get_i2c_bus(AUXBus *bus)
>>> +{
>>> +    return bus->bridge->i2c_bus;
>>> +}
>>> +
>>> +static void aux_bridge_init(Object *obj)
>>> +{
>>> +    AUXTOI2CState *s = AUXTOI2C(obj);
>>> +
>>> +    s->i2c_bus = i2c_init_bus(DEVICE(obj), "aux-i2c");
>>> +}
>>> +
>>> +static const TypeInfo aux_to_i2c_type_info = {
>>> +    .name = TYPE_AUXTOI2C,
>>> +    .parent = TYPE_DEVICE,
>>> +    .instance_size = sizeof(AUXTOI2CState),
>>> +    .instance_init = aux_bridge_init
>>> +};
>>> +
>>> +/*
>>> + * AUX Slave.
>>> + */
>>> +static void aux_slave_dev_print(Monitor *mon, DeviceState *dev, int
>>> indent)
>>> +{
>>> +    AUXBus *bus = AUX_BUS(qdev_get_parent_bus(dev));
>>> +    AUXSlave *s;
>>> +
>>> +    /* Don't print anything if the device is I2C "bridge". */
>>> +    if (aux_bus_is_bridge(bus, dev)) {
>>> +        return;
>>> +    }
>>> +
>>> +    s = AUX_SLAVE(dev);
>>> +
>>> +    monitor_printf(mon, "%*smemory " TARGET_FMT_plx "/" TARGET_FMT_plx
>>> "\n",
>>> +                   indent, "",
>>> +                   object_property_get_int(OBJECT(s->mmio), "addr",
>>> NULL),
>>> +                   memory_region_size(s->mmio));
>>> +}
>>> +
>>> +DeviceState *aux_create_slave(AUXBus *bus, const char *type, uint32_t
>>> addr)
>>> +{
>>> +    DeviceState *dev;
>>> +
>>> +    dev = DEVICE(object_new(type));
>>> +    assert(dev);
>>> +    qdev_set_parent_bus(dev, &bus->qbus);
>>> +    qdev_init_nofail(dev);
>>> +    aux_bus_map_device(AUX_BUS(qdev_get_parent_bus(dev)),
>>> AUX_SLAVE(dev), addr);
>>> +    return dev;
>>> +}
>>> +
>>> +void aux_init_mmio(AUXSlave *aux_slave, MemoryRegion *mmio)
>>> +{
>>> +    assert(!aux_slave->mmio);
>>> +    aux_slave->mmio = mmio;
>>> +}
>>> +
>>> +static void aux_slave_class_init(ObjectClass *klass, void *data)
>>> +{
>>> +    DeviceClass *k = DEVICE_CLASS(klass);
>>> +
>>> +    set_bit(DEVICE_CATEGORY_MISC, k->categories);
>>> +    k->bus_type = TYPE_AUX_BUS;
>>> +}
>>> +
>>> +static const TypeInfo aux_slave_type_info = {
>>> +    .name = TYPE_AUX_SLAVE,
>>> +    .parent = TYPE_DEVICE,
>>> +    .instance_size = sizeof(AUXSlave),
>>> +    .abstract = true,
>>> +    .class_init = aux_slave_class_init,
>>> +};
>>> +
>>> +static void aux_slave_register_types(void)
>>> +{
>>> +    type_register_static(&aux_bus_info);
>>> +    type_register_static(&aux_slave_type_info);
>>> +    type_register_static(&aux_to_i2c_type_info);
>>> +}
>>> +
>>> +type_init(aux_slave_register_types)
>>> diff --git a/include/hw/misc/aux.h b/include/hw/misc/aux.h
>>> new file mode 100644
>>> index 0000000..5d3e7a5
>>> --- /dev/null
>>> +++ b/include/hw/misc/aux.h
>>> @@ -0,0 +1,124 @@
>>> +/*
>>> + * aux.h
>>> + *
>>> + *  Copyright (C)2014 : GreenSocs Ltd
>>> + *      http://www.greensocs.com/ , email: address@hidden
>>> + *
>>> + *  Developed by :
>>> + *  Frederic Konrad   <address@hidden>
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License as published by
>>> + * the Free Software Foundation, either version 2 of the License, or
>>> + * (at your option)any later version.
>>> + *
>>> + * This program is distributed in the hope that it will be useful,
>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>> + * GNU General Public License for more details.
>>> + *
>>> + * You should have received a copy of the GNU General Public License
>>> along
>>> + * with this program; if not, see <http://www.gnu.org/licenses/>.
>>> + *
>>> + */
>>> +
>>> +#ifndef QEMU_AUX_H
>>> +#define QEMU_AUX_H
>>> +
>>> +#include "hw/qdev.h"
>>> +
>>> +typedef struct AUXBus AUXBus;
>>> +typedef struct AUXSlave AUXSlave;
>>> +typedef enum AUXCommand AUXCommand;
>>> +typedef enum AUXReply AUXReply;
>>> +typedef struct AUXTOI2CState AUXTOI2CState;
>>> +
>>> +enum AUXCommand {
>>> +    WRITE_I2C = 0,
>>> +    READ_I2C = 1,
>>> +    WRITE_I2C_STATUS = 2,
>>> +    WRITE_I2C_MOT = 4,
>>> +    READ_I2C_MOT = 5,
>>> +    WRITE_AUX = 8,
>>> +    READ_AUX = 9
>>> +};
>>> +
>>> +enum AUXReply {
>>> +    AUX_I2C_ACK = 0,
>>> +    AUX_NACK = 1,
>>> +    AUX_DEFER = 2,
>>> +    AUX_I2C_NACK = 4,
>>> +    AUX_I2C_DEFER = 8
>>> +};
>>> +
>>> +struct AUXBus {
>>> +    /* < private > */
>>> +    BusState qbus;
>>> +    /* < public > */
>>> +    AUXSlave *current_dev;
>>> +    AUXSlave *dev;
>>> +    uint32_t last_i2c_address;
>>> +    AUXCommand last_transaction;
>>> +
>>> +    AUXTOI2CState *bridge;
>>> +
>>> +    MemoryRegion *aux_io;
>>> +    AddressSpace aux_addr_space;
>>> +};
>>> +
>>> +#define TYPE_AUX_SLAVE "aux-slave"
>>> +#define AUX_SLAVE(obj) \
>>> +     OBJECT_CHECK(AUXSlave, (obj), TYPE_AUX_SLAVE)
>>> +
>>> +struct AUXSlave {
>>> +    /* < private > */
>>> +    DeviceState parent_obj;
>>> +
>>> +    /* < public > */
>>> +    MemoryRegion *mmio;
>>> +};
>>> +
>>> +/**
>>> + * aux_init_bus: Initialize an AUX bus.
>>> + *
>>> + * Returns the new AUX bus created.
>>> + *
>>> + * @parent The device where this bus is located.
>>> + * @name The name of the bus.
>>> + */
>>> +AUXBus *aux_init_bus(DeviceState *parent, const char *name);
>>> +
>>> +/*
>>> + * aux_request: Make a request on the bus.
>>> + *
>>> + * Returns the reply of the request.
>>> + *
>>> + * @bus Ths bus where the request happen.
>>> + * @cmd The command requested.
>>> + * @address The 20bits address of the slave.
>>> + * @len The length of the read or write.
>>> + * @data The data array which will be filled or read during transfer.
>>> + */
>>> +AUXReply aux_request(AUXBus *bus, AUXCommand cmd, uint32_t address,
>>> +                              uint8_t len, uint8_t *data);
>>> +
>>> +/*
>>> + * aux_get_i2c_bus: Get the i2c bus for I2C over AUX command.
>>> + *
>>> + * Returns the i2c bus associated to this AUX bus.
>>> + *
>>> + * @bus The AUX bus.
>>> + */
>>> +I2CBus *aux_get_i2c_bus(AUXBus *bus);
>>> +
>>> +/*
>>> + * aux_init_mmio: Init an mmio for an AUX slave.
>>> + *
>>> + * @aux_slave The AUX slave.
>>> + * @mmio The mmio to be registered.
>>> + */
>>> +void aux_init_mmio(AUXSlave *aux_slave, MemoryRegion *mmio);
>>> +
>>> +DeviceState *aux_create_slave(AUXBus *bus, const char *name, uint32_t
>>> addr);
>>> +
>>> +#endif /* !QEMU_AUX_H */
>>> --
>>> 1.9.0
>>>
>

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[Qemu-devel] [PATCH V6 0/8] Xilinx DisplayPort., fred . konrad, 2016/01/04
- [Qemu-devel] [PATCH V6 3/8] i2c: implement broadcast write, fred . konrad, 2016/01/04
- [Qemu-devel] [PATCH V6 1/8] i2cbus: remove unused dev field, fred . konrad, 2016/01/04
- [Qemu-devel] [PATCH V6 2/8] introduce aux-bus, fred . konrad, 2016/01/04
  - Re: [Qemu-devel] [PATCH V6 2/8] introduce aux-bus, Peter Crosthwaite, 2016/01/13
    - Re: [Qemu-devel] [PATCH V6 2/8] introduce aux-bus, KONRAD Frederic, 2016/01/14
    - Re: [Qemu-devel] [PATCH V6 2/8] introduce aux-bus, Peter Crosthwaite <=
  - Re: [Qemu-devel] [PATCH V6 2/8] introduce aux-bus, Alistair Francis, 2016/01/15
- [Qemu-devel] [PATCH V6 4/8] introduce dpcd module, fred . konrad, 2016/01/04
- [Qemu-devel] [PATCH V6 5/8] hw/i2c-ddc.c: Implement DDC I2C slave, fred . konrad, 2016/01/04
- [Qemu-devel] [PATCH V6 8/8] arm: xlnx-zynqmp: Add xlnx-dp and xlnx-dpdma, fred . konrad, 2016/01/04
  - Re: [Qemu-devel] [PATCH V6 8/8] arm: xlnx-zynqmp: Add xlnx-dp and xlnx-dpdma, Alistair Francis, 2016/01/15
    - Re: [Qemu-devel] [PATCH V6 8/8] arm: xlnx-zynqmp: Add xlnx-dp and xlnx-dpdma, Frederic Konrad, 2016/01/28
- [Qemu-devel] [PATCH V6 6/8] introduce xlnx-dpdma, fred . konrad, 2016/01/04
- [Qemu-devel] [PATCH V6 7/8] introduce xlnx-dp, fred . konrad, 2016/01/04
  - Re: [Qemu-devel] [PATCH V6 7/8] introduce xlnx-dp, Alistair Francis, 2016/01/15
    - Re: [Qemu-devel] [PATCH V6 7/8] introduce xlnx-dp, Frederic Konrad, 2016/01/28

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