qemu

FORK: QEMU emulator
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ssi.c (3590B)

      1 /*
      2  * QEMU Synchronous Serial Interface support
      3  *
      4  * Copyright (c) 2009 CodeSourcery.
      5  * Copyright (c) 2012 Peter A.G. Crosthwaite (peter.crosthwaite@petalogix.com)
      6  * Copyright (c) 2012 PetaLogix Pty Ltd.
      7  * Written by Paul Brook
      8  *
      9  * This code is licensed under the GNU GPL v2.
     10  *
     11  * Contributions after 2012-01-13 are licensed under the terms of the
     12  * GNU GPL, version 2 or (at your option) any later version.
     13  */
     14 
     15 #include "qemu/osdep.h"
     16 #include "hw/ssi/ssi.h"
     17 #include "migration/vmstate.h"
     18 #include "qemu/module.h"
     19 #include "qapi/error.h"
     20 #include "qom/object.h"
     21 
     22 struct SSIBus {
     23     BusState parent_obj;
     24 };
     25 
     26 #define TYPE_SSI_BUS "SSI"
     27 OBJECT_DECLARE_SIMPLE_TYPE(SSIBus, SSI_BUS)
     28 
     29 static const TypeInfo ssi_bus_info = {
     30     .name = TYPE_SSI_BUS,
     31     .parent = TYPE_BUS,
     32     .instance_size = sizeof(SSIBus),
     33 };
     34 
     35 static void ssi_cs_default(void *opaque, int n, int level)
     36 {
     37     SSIPeripheral *s = SSI_PERIPHERAL(opaque);
     38     bool cs = !!level;
     39     assert(n == 0);
     40     if (s->cs != cs) {
     41         if (s->spc->set_cs) {
     42             s->spc->set_cs(s, cs);
     43         }
     44     }
     45     s->cs = cs;
     46 }
     47 
     48 static uint32_t ssi_transfer_raw_default(SSIPeripheral *dev, uint32_t val)
     49 {
     50     SSIPeripheralClass *ssc = dev->spc;
     51 
     52     if ((dev->cs && ssc->cs_polarity == SSI_CS_HIGH) ||
     53         (!dev->cs && ssc->cs_polarity == SSI_CS_LOW) ||
     54         ssc->cs_polarity == SSI_CS_NONE) {
     55         return ssc->transfer(dev, val);
     56     }
     57     return 0;
     58 }
     59 
     60 static void ssi_peripheral_realize(DeviceState *dev, Error **errp)
     61 {
     62     SSIPeripheral *s = SSI_PERIPHERAL(dev);
     63     SSIPeripheralClass *ssc = SSI_PERIPHERAL_GET_CLASS(s);
     64 
     65     if (ssc->transfer_raw == ssi_transfer_raw_default &&
     66             ssc->cs_polarity != SSI_CS_NONE) {
     67         qdev_init_gpio_in_named(dev, ssi_cs_default, SSI_GPIO_CS, 1);
     68     }
     69     s->spc = ssc;
     70 
     71     ssc->realize(s, errp);
     72 }
     73 
     74 static void ssi_peripheral_class_init(ObjectClass *klass, void *data)
     75 {
     76     SSIPeripheralClass *ssc = SSI_PERIPHERAL_CLASS(klass);
     77     DeviceClass *dc = DEVICE_CLASS(klass);
     78 
     79     dc->realize = ssi_peripheral_realize;
     80     dc->bus_type = TYPE_SSI_BUS;
     81     if (!ssc->transfer_raw) {
     82         ssc->transfer_raw = ssi_transfer_raw_default;
     83     }
     84 }
     85 
     86 static const TypeInfo ssi_peripheral_info = {
     87     .name = TYPE_SSI_PERIPHERAL,
     88     .parent = TYPE_DEVICE,
     89     .class_init = ssi_peripheral_class_init,
     90     .class_size = sizeof(SSIPeripheralClass),
     91     .abstract = true,
     92 };
     93 
     94 bool ssi_realize_and_unref(DeviceState *dev, SSIBus *bus, Error **errp)
     95 {
     96     return qdev_realize_and_unref(dev, &bus->parent_obj, errp);
     97 }
     98 
     99 DeviceState *ssi_create_peripheral(SSIBus *bus, const char *name)
    100 {
    101     DeviceState *dev = qdev_new(name);
    102 
    103     ssi_realize_and_unref(dev, bus, &error_fatal);
    104     return dev;
    105 }
    106 
    107 SSIBus *ssi_create_bus(DeviceState *parent, const char *name)
    108 {
    109     BusState *bus;
    110     bus = qbus_new(TYPE_SSI_BUS, parent, name);
    111     return SSI_BUS(bus);
    112 }
    113 
    114 uint32_t ssi_transfer(SSIBus *bus, uint32_t val)
    115 {
    116     BusState *b = BUS(bus);
    117     BusChild *kid;
    118     uint32_t r = 0;
    119 
    120     QTAILQ_FOREACH(kid, &b->children, sibling) {
    121         SSIPeripheral *p = SSI_PERIPHERAL(kid->child);
    122         r |= p->spc->transfer_raw(p, val);
    123     }
    124 
    125     return r;
    126 }
    127 
    128 const VMStateDescription vmstate_ssi_peripheral = {
    129     .name = "SSISlave",
    130     .version_id = 1,
    131     .minimum_version_id = 1,
    132     .fields = (VMStateField[]) {
    133         VMSTATE_BOOL(cs, SSIPeripheral),
    134         VMSTATE_END_OF_LIST()
    135     }
    136 };
    137 
    138 static void ssi_peripheral_register_types(void)
    139 {
    140     type_register_static(&ssi_bus_info);
    141     type_register_static(&ssi_peripheral_info);
    142 }
    143 
    144 type_init(ssi_peripheral_register_types)