Re: [Qemu-devel] [PATCH V4 6/7] CAN bus PCM-3680I PCI (dual SJA1000 channel) emulation added.

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

On 01/14/2018 05:14 PM, pisa@cmp.felk.cvut.cz wrote:
> From: Deniz Eren <deniz.eren@icloud.com>
> 
> Signed-off-by: Deniz Eren <deniz.eren@icloud.com>
> Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
> ---
>  hw/can/Makefile.objs     |   1 +
>  hw/can/can_pcm3680_pci.c | 336 +++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 337 insertions(+)
>  create mode 100644 hw/can/can_pcm3680_pci.c
> 
> diff --git a/hw/can/Makefile.objs b/hw/can/Makefile.objs
> index c9d07b9b16..6a328f0c3a 100644
> --- a/hw/can/Makefile.objs
> +++ b/hw/can/Makefile.objs
> @@ -9,4 +9,5 @@ common-obj-y += can_host_stub.o
>  endif
>  common-obj-$(CONFIG_CAN_SJA1000) += can_sja1000.o
>  common-obj-$(CONFIG_CAN_PCI) += can_kvaser_pci.o
> +common-obj-$(CONFIG_CAN_PCI) += can_pcm3680_pci.o
>  endif
> diff --git a/hw/can/can_pcm3680_pci.c b/hw/can/can_pcm3680_pci.c
> new file mode 100644
> index 0000000000..e85b61849a
> --- /dev/null
> +++ b/hw/can/can_pcm3680_pci.c
> @@ -0,0 +1,336 @@
> +/*
> + * PCM-3680i PCI CAN device (SJA1000 based) emulation
> + *
> + * Copyright (c) 2016 Deniz Eren (deniz.eren@icloud.com)
> + *
> + * Based on Kvaser PCI CAN device (SJA1000 based) emulation implemented by
> + * Jin Yang and Pavel Pisa
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to deal
> + * in the Software without restriction, including without limitation the rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu/event_notifier.h"
> +#include "qemu/thread.h"
> +#include "qemu/sockets.h"
> +#include "qemu/error-report.h"
> +#include "chardev/char.h"
> +#include "hw/hw.h"
> +#include "hw/pci/pci.h"
> +#include "can/can_emu.h"
> +
> +#include "can_sja1000.h"
> +
> +#define TYPE_CAN_PCI_DEV "pcm3680_pci"
> +
> +#define PCM3680i_PCI_DEV(obj) \
> +    OBJECT_CHECK(Pcm3680iPCIState, (obj), TYPE_CAN_PCI_DEV)
> +
> +/* the PCI device and vendor IDs */
> +#ifndef PCM3680i_PCI_VENDOR_ID1
> +#define PCM3680i_PCI_VENDOR_ID1     0x13fe
> +#endif
> +
> +#ifndef PCM3680i_PCI_DEVICE_ID1
> +#define PCM3680i_PCI_DEVICE_ID1     0xc002
> +#endif
> +
> +#define PCM3680i_PCI_SJA_RANGE     0x200
> +
> +#define PCM3680i_PCI_BYTES_PER_SJA 0x20
> +
> +typedef struct Pcm3680iPCIState {
> +    /*< private >*/
> +    PCIDevice       dev;
> +    /*< public >*/
> +    MemoryRegion    sja_io[2];
> +
> +    CanSJA1000State sja_state[2];
> +    qemu_irq        irq;
> +
> +    char            *model; /* The model that support, only SJA1000 now. */
> +    char            *canbus[2];
> +    char            *host[2];
> +} Pcm3680iPCIState;
> +
> +static void pcm3680i_pci_irq_raise(void *opaque)
> +{
> +    Pcm3680iPCIState *d = (Pcm3680iPCIState *)opaque;
> +
> +    qemu_irq_raise(d->irq);
> +}
> +
> +static void pcm3680i_pci_irq_lower(void *opaque)
> +{
> +    Pcm3680iPCIState *d = (Pcm3680iPCIState *)opaque;
> +
> +    qemu_irq_lower(d->irq);
> +}
> +
> +static void
> +pcm3680i_pci_reset(void *opaque)

static void pcm3680i_pci_reset(void *opaque)

> +{
> +    Pcm3680iPCIState *d = (Pcm3680iPCIState *)opaque;
> +    CanSJA1000State *s1 = &d->sja_state[0];
> +    CanSJA1000State *s2 = &d->sja_state[1];
> +
> +    can_sja_hardware_reset(s1);
> +    can_sja_hardware_reset(s2);
> +}
> +
> +static uint64_t pcm3680i_pci_sja1_io_read(void *opaque, hwaddr addr,
> +                                          unsigned size)
> +{
> +    Pcm3680iPCIState *d = opaque;
> +    CanSJA1000State *s = &d->sja_state[0];
> +
> +    if (addr >= PCM3680i_PCI_BYTES_PER_SJA) {
> +        return 0;
> +    }
> +
> +    return can_sja_mem_read(s, addr, size);
> +}
> +
> +static void pcm3680i_pci_sja1_io_write(void *opaque, hwaddr addr,
> +                                       uint64_t data, unsigned size)
> +{
> +    Pcm3680iPCIState *d = opaque;
> +    CanSJA1000State *s = &d->sja_state[0];
> +
> +    if (addr >= PCM3680i_PCI_BYTES_PER_SJA) {
> +        return;
> +    }
> +
> +    can_sja_mem_write(s, addr, data, size);
> +}
> +
> +static uint64_t pcm3680i_pci_sja2_io_read(void *opaque, hwaddr addr,
> +                                          unsigned size)
> +{
> +    Pcm3680iPCIState *d = opaque;
> +    CanSJA1000State *s = &d->sja_state[1];
> +
> +    if (addr >= PCM3680i_PCI_BYTES_PER_SJA) {
> +        return 0;
> +    }
> +
> +    return can_sja_mem_read(s, addr, size);
> +}
> +
> +static void pcm3680i_pci_sja2_io_write(void *opaque, hwaddr addr, uint64_t data,
> +                             unsigned size)
> +{
> +    Pcm3680iPCIState *d = opaque;
> +    CanSJA1000State *s = &d->sja_state[1];
> +
> +    if (addr >= PCM3680i_PCI_BYTES_PER_SJA) {
> +        return;
> +    }
> +
> +    can_sja_mem_write(s, addr, data, size);
> +}
> +
> +static const MemoryRegionOps pcm3680i_pci_sja1_io_ops = {
> +    .read = pcm3680i_pci_sja1_io_read,
> +    .write = pcm3680i_pci_sja1_io_write,
> +    .endianness = DEVICE_LITTLE_ENDIAN,
> +    .impl = {
> +        .min_access_size = 1,

superfluous ^

> +        .max_access_size = 1,
> +    },
> +};
> +
> +static const MemoryRegionOps pcm3680i_pci_sja2_io_ops = {
> +    .read = pcm3680i_pci_sja2_io_read,
> +    .write = pcm3680i_pci_sja2_io_write,
> +    .endianness = DEVICE_LITTLE_ENDIAN,
> +    .impl = {
> +        .min_access_size = 1,

ditto

> +        .max_access_size = 1,
> +    },
> +};
> +
> +static int pcm3680i_pci_init(PCIDevice *pci_dev)
> +{
> +    Pcm3680iPCIState *d = PCM3680i_PCI_DEV(pci_dev);
> +    CanSJA1000State *s1 = &d->sja_state[0];
> +    CanSJA1000State *s2 = &d->sja_state[1];
> +    uint8_t *pci_conf;
> +    CanBusState *can_bus1;
> +    CanBusState *can_bus2;

why not use CanBusState *can_bus[2]?

> +
> +    if (d->model) {
> +        if (strncmp(d->model, "pcican-s", 256)) { /* for security reason */
> +            error_report("Can't create CAN device, "
> +                         "the model %s is not supported now.", d->model);
> +            exit(1);
> +        }
> +    }
> +
> +    can_bus1 = can_bus_find_by_name(d->canbus[0], true);
> +    if (can_bus1 == NULL) {
> +        error_report("Cannot create can find/allocate CAN bus #1");
> +        exit(1);
> +    }
> +
> +    can_bus2 = can_bus_find_by_name(d->canbus[1], true);
> +    if (can_bus2 == NULL) {
> +        error_report("Cannot create can find/allocate CAN bus #2");
> +        exit(1);
> +    }
> +
> +    if (d->host[0] != NULL) {
> +        if (can_bus_connect_to_host_device(can_bus1, d->host[0]) < 0) {
> +            error_report("Cannot connect CAN bus to host #1 device \"%s\"",
> +                         d->host[0]);
> +            exit(1);
> +        }
> +    }
> +
> +    if (d->host[1] != NULL) {
> +        if (can_bus_connect_to_host_device(can_bus2, d->host[1]) < 0) {
> +            error_report("Cannot connect CAN bus to host #2 device \"%s\"",
> +                         d->host[1]);
> +            exit(1);
> +        }
> +    }
> +
> +    pci_conf = pci_dev->config;
> +    pci_conf[PCI_INTERRUPT_PIN] = 0x01; /* interrupt pin A */
> +
> +    d->irq = pci_allocate_irq(&d->dev);
> +
> +    can_sja_init(s1, pcm3680i_pci_irq_raise, pcm3680i_pci_irq_lower, d);
> +    can_sja_init(s2, pcm3680i_pci_irq_raise, pcm3680i_pci_irq_lower, d);
> +
> +    qemu_register_reset(pcm3680i_pci_reset, d);
> +
> +    if (can_sja_connect_to_bus(s1, can_bus1) < 0) {
> +        error_report("can_sja_connect_to_bus failed");
> +        exit(1);
> +    }
> +
> +    if (can_sja_connect_to_bus(s2, can_bus2) < 0) {
> +        error_report("can_sja_connect_to_bus failed");
> +        exit(1);
> +    }
> +
> +    memory_region_init_io(&d->sja_io[0], OBJECT(d), &pcm3680i_pci_sja1_io_ops,
> +                          d, "pcm3680i_pci-sja1", PCM3680i_PCI_SJA_RANGE / 2);
> +    memory_region_init_io(&d->sja_io[1], OBJECT(d), &pcm3680i_pci_sja2_io_ops,
> +                          d, "pcm3680i_pci-sja2", PCM3680i_PCI_SJA_RANGE / 2);
> +
> +    pci_register_bar(&d->dev, /*BAR*/ 0, PCI_BASE_ADDRESS_SPACE_IO,
> +                                             &d->sja_io[0]);
> +    pci_register_bar(&d->dev, /*BAR*/ 1, PCI_BASE_ADDRESS_SPACE_IO,
> +                                             &d->sja_io[1]);
> +
> +    return 0;
> +}
> +
> +static void pcm3680i_pci_exit(PCIDevice *pci_dev)
> +{
> +    Pcm3680iPCIState *d = PCM3680i_PCI_DEV(pci_dev);
> +    CanSJA1000State *s1 = &d->sja_state[0];
> +    CanSJA1000State *s2 = &d->sja_state[1];
> +
> +    can_sja_disconnect(s1);
> +    can_sja_disconnect(s2);
> +
> +    qemu_unregister_reset(pcm3680i_pci_reset, d);
> +
> +    /*
> +     * region d->sja_io is destroyed by QOM now
> +     */
> +    /* memory_region_destroy(&d->sja_io[0]); */
> +    /* memory_region_destroy(&d->sja_io[1]); */
> +
> +    can_sja_exit(s1);
> +    can_sja_exit(s2);
> +
> +    qemu_free_irq(d->irq);
> +}
> +
> +static const VMStateDescription vmstate_pcm3680i_pci = {
> +    .name = "pcm3680i_pci",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .minimum_version_id_old = 1,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_PCI_DEVICE(dev, Pcm3680iPCIState),
> +        VMSTATE_STRUCT(sja_state[0], Pcm3680iPCIState, 0,
> +                       vmstate_can_sja, CanSJA1000State),
> +        VMSTATE_STRUCT(sja_state[1], Pcm3680iPCIState, 0,
> +                       vmstate_can_sja, CanSJA1000State),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
> +static void qdev_pcm3680i_pci_reset(DeviceState *dev)
> +{
> +    Pcm3680iPCIState *d = PCM3680i_PCI_DEV(dev);
> +    pcm3680i_pci_reset(d);
> +}
> +
> +static Property pcm3680i_pci_properties[] = {
> +    DEFINE_PROP_STRING("canbus1",   Pcm3680iPCIState, canbus[0]),
> +    DEFINE_PROP_STRING("canbus2",   Pcm3680iPCIState, canbus[1]),
> +    DEFINE_PROP_STRING("host1",  Pcm3680iPCIState, host[0]),
> +    DEFINE_PROP_STRING("host2",  Pcm3680iPCIState, host[1]),
> +    DEFINE_PROP_STRING("model", Pcm3680iPCIState, model),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void pcm3680i_pci_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
> +
> +    k->init = pcm3680i_pci_init;
> +    k->exit = pcm3680i_pci_exit;
> +    k->vendor_id = PCM3680i_PCI_VENDOR_ID1;
> +    k->device_id = PCM3680i_PCI_DEVICE_ID1;
> +    k->revision = 0x00;
> +    k->class_id = 0x000c09;
> +    k->subsystem_vendor_id = PCM3680i_PCI_VENDOR_ID1;
> +    k->subsystem_id = PCM3680i_PCI_DEVICE_ID1;
> +    dc->desc = "Pcm3680i PCICANx";
> +    dc->props = pcm3680i_pci_properties;
> +    dc->vmsd = &vmstate_pcm3680i_pci;
> +    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
> +    dc->reset = qdev_pcm3680i_pci_reset;
> +}
> +
> +static const TypeInfo pcm3680i_pci_info = {
> +    .name          = TYPE_CAN_PCI_DEV,
> +    .parent        = TYPE_PCI_DEVICE,
> +    .instance_size = sizeof(Pcm3680iPCIState),
> +    .class_init    = pcm3680i_pci_class_init,
> +    .interfaces = (InterfaceInfo[]) {
> +        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
> +        { },
> +    },
> +};
> +
> +static void pcm3680i_pci_register_types(void)
> +{
> +    type_register_static(&pcm3680i_pci_info);
> +}
> +
> +type_init(pcm3680i_pci_register_types)
>