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qemu/hw/misc/mps2-scc.c

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/*
* ARM MPS2 SCC emulation
*
* Copyright (c) 2017 Linaro Limited
* Written by Peter Maydell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 or
* (at your option) any later version.
*/
/* This is a model of the SCC (Serial Communication Controller)
* found in the FPGA images of MPS2 development boards.
*
* Documentation of it can be found in the MPS2 TRM:
* http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.100112_0100_03_en/index.html
* and also in the Application Notes documenting individual FPGA images.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qapi/error.h"
#include "trace.h"
#include "hw/sysbus.h"
#include "hw/registerfields.h"
#include "hw/misc/mps2-scc.h"
REG32(CFG0, 0)
REG32(CFG1, 4)
REG32(CFG3, 0xc)
REG32(CFG4, 0x10)
REG32(CFGDATA_RTN, 0xa0)
REG32(CFGDATA_OUT, 0xa4)
REG32(CFGCTRL, 0xa8)
FIELD(CFGCTRL, DEVICE, 0, 12)
FIELD(CFGCTRL, RES1, 12, 8)
FIELD(CFGCTRL, FUNCTION, 20, 6)
FIELD(CFGCTRL, RES2, 26, 4)
FIELD(CFGCTRL, WRITE, 30, 1)
FIELD(CFGCTRL, START, 31, 1)
REG32(CFGSTAT, 0xac)
FIELD(CFGSTAT, DONE, 0, 1)
FIELD(CFGSTAT, ERROR, 1, 1)
REG32(DLL, 0x100)
REG32(AID, 0xFF8)
REG32(ID, 0xFFC)
/* Handle a write via the SYS_CFG channel to the specified function/device.
* Return false on error (reported to guest via SYS_CFGCTRL ERROR bit).
*/
static bool scc_cfg_write(MPS2SCC *s, unsigned function,
unsigned device, uint32_t value)
{
trace_mps2_scc_cfg_write(function, device, value);
if (function != 1 || device >= NUM_OSCCLK) {
qemu_log_mask(LOG_GUEST_ERROR,
"MPS2 SCC config write: bad function %d device %d\n",
function, device);
return false;
}
s->oscclk[device] = value;
return true;
}
/* Handle a read via the SYS_CFG channel to the specified function/device.
* Return false on error (reported to guest via SYS_CFGCTRL ERROR bit),
* or set *value on success.
*/
static bool scc_cfg_read(MPS2SCC *s, unsigned function,
unsigned device, uint32_t *value)
{
if (function != 1 || device >= NUM_OSCCLK) {
qemu_log_mask(LOG_GUEST_ERROR,
"MPS2 SCC config read: bad function %d device %d\n",
function, device);
return false;
}
*value = s->oscclk[device];
trace_mps2_scc_cfg_read(function, device, *value);
return true;
}
static uint64_t mps2_scc_read(void *opaque, hwaddr offset, unsigned size)
{
MPS2SCC *s = MPS2_SCC(opaque);
uint64_t r;
switch (offset) {
case A_CFG0:
r = s->cfg0;
break;
case A_CFG1:
r = s->cfg1;
break;
case A_CFG3:
/* These are user-settable DIP switches on the board. We don't
* model that, so just return zeroes.
*/
r = 0;
break;
case A_CFG4:
r = s->cfg4;
break;
case A_CFGDATA_RTN:
r = s->cfgdata_rtn;
break;
case A_CFGDATA_OUT:
r = s->cfgdata_out;
break;
case A_CFGCTRL:
r = s->cfgctrl;
break;
case A_CFGSTAT:
r = s->cfgstat;
break;
case A_DLL:
r = s->dll;
break;
case A_AID:
r = s->aid;
break;
case A_ID:
r = s->id;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"MPS2 SCC read: bad offset %x\n", (int) offset);
r = 0;
break;
}
trace_mps2_scc_read(offset, r, size);
return r;
}
static void mps2_scc_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
MPS2SCC *s = MPS2_SCC(opaque);
trace_mps2_scc_write(offset, value, size);
switch (offset) {
case A_CFG0:
/* TODO on some boards bit 0 controls RAM remapping */
s->cfg0 = value;
break;
case A_CFG1:
/* CFG1 bits [7:0] control the board LEDs. We don't currently have
* a mechanism for displaying this graphically, so use a trace event.
*/
trace_mps2_scc_leds(value & 0x80 ? '*' : '.',
value & 0x40 ? '*' : '.',
value & 0x20 ? '*' : '.',
value & 0x10 ? '*' : '.',
value & 0x08 ? '*' : '.',
value & 0x04 ? '*' : '.',
value & 0x02 ? '*' : '.',
value & 0x01 ? '*' : '.');
s->cfg1 = value;
break;
case A_CFGDATA_OUT:
s->cfgdata_out = value;
break;
case A_CFGCTRL:
/* Writing to CFGCTRL clears SYS_CFGSTAT */
s->cfgstat = 0;
s->cfgctrl = value & ~(R_CFGCTRL_RES1_MASK |
R_CFGCTRL_RES2_MASK |
R_CFGCTRL_START_MASK);
if (value & R_CFGCTRL_START_MASK) {
/* Start bit set -- do a read or write (instantaneously) */
int device = extract32(s->cfgctrl, R_CFGCTRL_DEVICE_SHIFT,
R_CFGCTRL_DEVICE_LENGTH);
int function = extract32(s->cfgctrl, R_CFGCTRL_FUNCTION_SHIFT,
R_CFGCTRL_FUNCTION_LENGTH);
s->cfgstat = R_CFGSTAT_DONE_MASK;
if (s->cfgctrl & R_CFGCTRL_WRITE_MASK) {
if (!scc_cfg_write(s, function, device, s->cfgdata_out)) {
s->cfgstat |= R_CFGSTAT_ERROR_MASK;
}
} else {
uint32_t result;
if (!scc_cfg_read(s, function, device, &result)) {
s->cfgstat |= R_CFGSTAT_ERROR_MASK;
} else {
s->cfgdata_rtn = result;
}
}
}
break;
case A_DLL:
/* DLL stands for Digital Locked Loop.
* Bits [31:24] (DLL_LOCK_MASK) are writable, and indicate a
* mask of which of the DLL_LOCKED bits [16:23] should be ORed
* together to determine the ALL_UNMASKED_DLLS_LOCKED bit [0].
* For QEMU, our DLLs are always locked, so we can leave bit 0
* as 1 always and don't need to recalculate it.
*/
s->dll = deposit32(s->dll, 24, 8, extract32(value, 24, 8));
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"MPS2 SCC write: bad offset 0x%x\n", (int) offset);
break;
}
}
static const MemoryRegionOps mps2_scc_ops = {
.read = mps2_scc_read,
.write = mps2_scc_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void mps2_scc_reset(DeviceState *dev)
{
MPS2SCC *s = MPS2_SCC(dev);
int i;
trace_mps2_scc_reset();
s->cfg0 = 0;
s->cfg1 = 0;
s->cfgdata_rtn = 0;
s->cfgdata_out = 0;
s->cfgctrl = 0x100000;
s->cfgstat = 0;
s->dll = 0xffff0001;
for (i = 0; i < NUM_OSCCLK; i++) {
s->oscclk[i] = s->oscclk_reset[i];
}
}
static void mps2_scc_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
MPS2SCC *s = MPS2_SCC(obj);
memory_region_init_io(&s->iomem, obj, &mps2_scc_ops, s, "mps2-scc", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
}
static void mps2_scc_realize(DeviceState *dev, Error **errp)
{
}
static const VMStateDescription mps2_scc_vmstate = {
.name = "mps2-scc",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(cfg0, MPS2SCC),
VMSTATE_UINT32(cfg1, MPS2SCC),
VMSTATE_UINT32(cfgdata_rtn, MPS2SCC),
VMSTATE_UINT32(cfgdata_out, MPS2SCC),
VMSTATE_UINT32(cfgctrl, MPS2SCC),
VMSTATE_UINT32(cfgstat, MPS2SCC),
VMSTATE_UINT32(dll, MPS2SCC),
VMSTATE_UINT32_ARRAY(oscclk, MPS2SCC, NUM_OSCCLK),
VMSTATE_END_OF_LIST()
}
};
static Property mps2_scc_properties[] = {
/* Values for various read-only ID registers (which are specific
* to the board model or FPGA image)
*/
DEFINE_PROP_UINT32("scc-cfg4", MPS2SCC, cfg4, 0),
DEFINE_PROP_UINT32("scc-aid", MPS2SCC, aid, 0),
DEFINE_PROP_UINT32("scc-id", MPS2SCC, id, 0),
/* These are the initial settings for the source clocks on the board.
* In hardware they can be configured via a config file read by the
* motherboard configuration controller to suit the FPGA image.
* These default values are used by most of the standard FPGA images.
*/
DEFINE_PROP_UINT32("oscclk0", MPS2SCC, oscclk_reset[0], 50000000),
DEFINE_PROP_UINT32("oscclk1", MPS2SCC, oscclk_reset[1], 24576000),
DEFINE_PROP_UINT32("oscclk2", MPS2SCC, oscclk_reset[2], 25000000),
DEFINE_PROP_END_OF_LIST(),
};
static void mps2_scc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = mps2_scc_realize;
dc->vmsd = &mps2_scc_vmstate;
dc->reset = mps2_scc_reset;
dc->props = mps2_scc_properties;
}
static const TypeInfo mps2_scc_info = {
.name = TYPE_MPS2_SCC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(MPS2SCC),
.instance_init = mps2_scc_init,
.class_init = mps2_scc_class_init,
};
static void mps2_scc_register_types(void)
{
type_register_static(&mps2_scc_info);
}
type_init(mps2_scc_register_types);
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