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qemu/hw/net/fsl_etsec/etsec.c
Peter Maydell 9598c1bb39 ptimer: Rename PTIMER_POLICY_DEFAULT to PTIMER_POLICY_LEGACY 
The traditional ptimer behaviour includes a collection of weird edge
case behaviours.  In 2016 we improved the ptimer implementation to
fix these and generally make the behaviour more flexible, with
ptimers opting in to the new behaviour by passing an appropriate set
of policy flags to ptimer_init().  For backwards-compatibility, we
defined PTIMER_POLICY_DEFAULT (which sets no flags) to give the old
weird behaviour.

This turns out to be a poor choice of name, because people writing
new devices which use ptimers are misled into thinking that the
default is probably a sensible choice of flags, when in fact it is
almost always not what you want.  Rename PTIMER_POLICY_DEFAULT to
PTIMER_POLICY_LEGACY and beef up the comment to more clearly say that
new devices should not be using it.

The code-change part of this commit was produced by
  sed -i -e 's/PTIMER_POLICY_DEFAULT/PTIMER_POLICY_LEGACY/g' $(git grep -l PTIMER_POLICY_DEFAULT)
with the exception of a test name string change in
tests/unit/ptimer-test.c which was added manually.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Francisco Iglesias <francisco.iglesias@amd.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220516103058.162280-1-peter.maydell@linaro.org
2022-05-19 16:19:03 +01:00

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/*
* QEMU Freescale eTSEC Emulator
*
* Copyright (c) 2011-2013 AdaCore
*
* 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.
*/
/*
* This implementation doesn't include ring priority, TCP/IP Off-Load, QoS.
*/
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "hw/irq.h"
#include "hw/ptimer.h"
#include "hw/qdev-properties.h"
#include "etsec.h"
#include "registers.h"
#include "qapi/error.h"
#include "qemu/log.h"
#include "qemu/module.h"
/* #define HEX_DUMP */
/* #define DEBUG_REGISTER */
#ifdef DEBUG_REGISTER
static const int debug_etsec = 1;
#else
static const int debug_etsec;
#endif
#define DPRINTF(fmt, ...) do { \
if (debug_etsec) { \
qemu_log(fmt , ## __VA_ARGS__); \
} \
} while (0)
/* call after any change to IEVENT or IMASK */
void etsec_update_irq(eTSEC *etsec)
{
uint32_t ievent = etsec->regs[IEVENT].value;
uint32_t imask = etsec->regs[IMASK].value;
uint32_t active = ievent & imask;
int tx = !!(active & IEVENT_TX_MASK);
int rx = !!(active & IEVENT_RX_MASK);
int err = !!(active & IEVENT_ERR_MASK);
DPRINTF("%s IRQ ievent=%"PRIx32" imask=%"PRIx32" %c%c%c",
__func__, ievent, imask,
tx ? 'T' : '_',
rx ? 'R' : '_',
err ? 'E' : '_');
qemu_set_irq(etsec->tx_irq, tx);
qemu_set_irq(etsec->rx_irq, rx);
qemu_set_irq(etsec->err_irq, err);
}
static uint64_t etsec_read(void *opaque, hwaddr addr, unsigned size)
{
eTSEC *etsec = opaque;
uint32_t reg_index = addr / 4;
eTSEC_Register *reg = NULL;
uint32_t ret = 0x0;
assert(reg_index < ETSEC_REG_NUMBER);
reg = &etsec->regs[reg_index];
switch (reg->access) {
case ACC_WO:
ret = 0x00000000;
break;
case ACC_RW:
case ACC_W1C:
case ACC_RO:
default:
ret = reg->value;
break;
}
DPRINTF("Read 0x%08x @ 0x" TARGET_FMT_plx
" : %s (%s)\n",
ret, addr, reg->name, reg->desc);
return ret;
}
static void write_tstat(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
int i = 0;
for (i = 0; i < 8; i++) {
/* Check THLTi flag in TSTAT */
if (value & (1 << (31 - i))) {
etsec_walk_tx_ring(etsec, i);
}
}
/* Write 1 to clear */
reg->value &= ~value;
}
static void write_rstat(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
int i = 0;
for (i = 0; i < 8; i++) {
/* Check QHLTi flag in RSTAT */
if (value & (1 << (23 - i)) && !(reg->value & (1 << (23 - i)))) {
etsec_walk_rx_ring(etsec, i);
}
}
/* Write 1 to clear */
reg->value &= ~value;
}
static void write_tbasex(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
reg->value = value & ~0x7;
/* Copy this value in the ring's TxBD pointer */
etsec->regs[TBPTR0 + (reg_index - TBASE0)].value = value & ~0x7;
}
static void write_rbasex(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
reg->value = value & ~0x7;
/* Copy this value in the ring's RxBD pointer */
etsec->regs[RBPTR0 + (reg_index - RBASE0)].value = value & ~0x7;
}
static void write_dmactrl(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
reg->value = value;
if (value & DMACTRL_GRS) {
if (etsec->rx_buffer_len != 0) {
/* Graceful receive stop delayed until end of frame */
} else {
/* Graceful receive stop now */
etsec->regs[IEVENT].value |= IEVENT_GRSC;
etsec_update_irq(etsec);
}
}
if (value & DMACTRL_GTS) {
if (etsec->tx_buffer_len != 0) {
/* Graceful transmit stop delayed until end of frame */
} else {
/* Graceful transmit stop now */
etsec->regs[IEVENT].value |= IEVENT_GTSC;
etsec_update_irq(etsec);
}
}
if (!(value & DMACTRL_WOP)) {
/* Start polling */
ptimer_transaction_begin(etsec->ptimer);
ptimer_stop(etsec->ptimer);
ptimer_set_count(etsec->ptimer, 1);
ptimer_run(etsec->ptimer, 1);
ptimer_transaction_commit(etsec->ptimer);
}
}
static void etsec_write(void *opaque,
hwaddr addr,
uint64_t value,
unsigned size)
{
eTSEC *etsec = opaque;
uint32_t reg_index = addr / 4;
eTSEC_Register *reg = NULL;
uint32_t before = 0x0;
assert(reg_index < ETSEC_REG_NUMBER);
reg = &etsec->regs[reg_index];
before = reg->value;
switch (reg_index) {
case IEVENT:
/* Write 1 to clear */
reg->value &= ~value;
etsec_update_irq(etsec);
break;
case IMASK:
reg->value = value;
etsec_update_irq(etsec);
break;
case DMACTRL:
write_dmactrl(etsec, reg, reg_index, value);
break;
case TSTAT:
write_tstat(etsec, reg, reg_index, value);
break;
case RSTAT:
write_rstat(etsec, reg, reg_index, value);
break;
case TBASE0 ... TBASE7:
write_tbasex(etsec, reg, reg_index, value);
break;
case RBASE0 ... RBASE7:
write_rbasex(etsec, reg, reg_index, value);
break;
case MIIMCFG ... MIIMIND:
etsec_write_miim(etsec, reg, reg_index, value);
break;
default:
/* Default handling */
switch (reg->access) {
case ACC_RW:
case ACC_WO:
reg->value = value;
break;
case ACC_W1C:
reg->value &= ~value;
break;
case ACC_RO:
default:
/* Read Only or Unknown register */
break;
}
}
DPRINTF("Write 0x%08x @ 0x" TARGET_FMT_plx
" val:0x%08x->0x%08x : %s (%s)\n",
(unsigned int)value, addr, before, reg->value,
reg->name, reg->desc);
}
static const MemoryRegionOps etsec_ops = {
.read = etsec_read,
.write = etsec_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
.min_access_size = 4,
.max_access_size = 4,
},
};
static void etsec_timer_hit(void *opaque)
{
eTSEC *etsec = opaque;
ptimer_stop(etsec->ptimer);
if (!(etsec->regs[DMACTRL].value & DMACTRL_WOP)) {
if (!(etsec->regs[DMACTRL].value & DMACTRL_GTS)) {
etsec_walk_tx_ring(etsec, 0);
}
ptimer_set_count(etsec->ptimer, 1);
ptimer_run(etsec->ptimer, 1);
}
}
static void etsec_reset(DeviceState *d)
{
eTSEC *etsec = ETSEC_COMMON(d);
int i = 0;
int reg_index = 0;
/* Default value for all registers */
for (i = 0; i < ETSEC_REG_NUMBER; i++) {
etsec->regs[i].name = "Reserved";
etsec->regs[i].desc = "";
etsec->regs[i].access = ACC_UNKNOWN;
etsec->regs[i].value = 0x00000000;
}
/* Set-up known registers */
for (i = 0; eTSEC_registers_def[i].name != NULL; i++) {
reg_index = eTSEC_registers_def[i].offset / 4;
etsec->regs[reg_index].name = eTSEC_registers_def[i].name;
etsec->regs[reg_index].desc = eTSEC_registers_def[i].desc;
etsec->regs[reg_index].access = eTSEC_registers_def[i].access;
etsec->regs[reg_index].value = eTSEC_registers_def[i].reset;
}
etsec->tx_buffer = NULL;
etsec->tx_buffer_len = 0;
etsec->rx_buffer = NULL;
etsec->rx_buffer_len = 0;
etsec->phy_status =
MII_SR_EXTENDED_CAPS | MII_SR_LINK_STATUS | MII_SR_AUTONEG_CAPS |
MII_SR_AUTONEG_COMPLETE | MII_SR_PREAMBLE_SUPPRESS |
MII_SR_EXTENDED_STATUS | MII_SR_100T2_HD_CAPS | MII_SR_100T2_FD_CAPS |
MII_SR_10T_HD_CAPS | MII_SR_10T_FD_CAPS | MII_SR_100X_HD_CAPS |
MII_SR_100X_FD_CAPS | MII_SR_100T4_CAPS;
etsec_update_irq(etsec);
}
static ssize_t etsec_receive(NetClientState *nc,
const uint8_t *buf,
size_t size)
{
ssize_t ret;
eTSEC *etsec = qemu_get_nic_opaque(nc);
#if defined(HEX_DUMP)
fprintf(stderr, "%s receive size:%zd\n", nc->name, size);
qemu_hexdump(stderr, "", buf, size);
#endif
/* Flush is unnecessary as are already in receiving path */
etsec->need_flush = false;
ret = etsec_rx_ring_write(etsec, buf, size);
if (ret == 0) {
/* The packet will be queued, let's flush it when buffer is available
* again. */
etsec->need_flush = true;
}
return ret;
}
static void etsec_set_link_status(NetClientState *nc)
{
eTSEC *etsec = qemu_get_nic_opaque(nc);
etsec_miim_link_status(etsec, nc);
}
static NetClientInfo net_etsec_info = {
.type = NET_CLIENT_DRIVER_NIC,
.size = sizeof(NICState),
.receive = etsec_receive,
.link_status_changed = etsec_set_link_status,
};
static void etsec_realize(DeviceState *dev, Error **errp)
{
eTSEC *etsec = ETSEC_COMMON(dev);
etsec->nic = qemu_new_nic(&net_etsec_info, &etsec->conf,
object_get_typename(OBJECT(dev)), dev->id, etsec);
qemu_format_nic_info_str(qemu_get_queue(etsec->nic), etsec->conf.macaddr.a);
etsec->ptimer = ptimer_init(etsec_timer_hit, etsec, PTIMER_POLICY_LEGACY);
ptimer_transaction_begin(etsec->ptimer);
ptimer_set_freq(etsec->ptimer, 100);
ptimer_transaction_commit(etsec->ptimer);
}
static void etsec_instance_init(Object *obj)
{
eTSEC *etsec = ETSEC_COMMON(obj);
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
memory_region_init_io(&etsec->io_area, OBJECT(etsec), &etsec_ops, etsec,
"eTSEC", 0x1000);
sysbus_init_mmio(sbd, &etsec->io_area);
sysbus_init_irq(sbd, &etsec->tx_irq);
sysbus_init_irq(sbd, &etsec->rx_irq);
sysbus_init_irq(sbd, &etsec->err_irq);
}
static Property etsec_properties[] = {
DEFINE_NIC_PROPERTIES(eTSEC, conf),
DEFINE_PROP_END_OF_LIST(),
};
static void etsec_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = etsec_realize;
dc->reset = etsec_reset;
device_class_set_props(dc, etsec_properties);
/* Supported by ppce500 machine */
dc->user_creatable = true;
}
static const TypeInfo etsec_info = {
.name = TYPE_ETSEC_COMMON,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(eTSEC),
.class_init = etsec_class_init,
.instance_init = etsec_instance_init,
};
static void etsec_register_types(void)
{
type_register_static(&etsec_info);
}
type_init(etsec_register_types)
DeviceState *etsec_create(hwaddr base,
MemoryRegion * mr,
NICInfo * nd,
qemu_irq tx_irq,
qemu_irq rx_irq,
qemu_irq err_irq)
{
DeviceState *dev;
dev = qdev_new("eTSEC");
qdev_set_nic_properties(dev, nd);
sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, tx_irq);
sysbus_connect_irq(SYS_BUS_DEVICE(dev), 1, rx_irq);
sysbus_connect_irq(SYS_BUS_DEVICE(dev), 2, err_irq);
memory_region_add_subregion(mr, base,
SYS_BUS_DEVICE(dev)->mmio[0].memory);
return dev;
}
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