9:43 a.m.
The Xilinx 'ethlite' device was added in commit b43848a100
("xilinx: Add ethlite emulation"), being only built back
then for a big-endian MicroBlaze target (see commit 72b675caac
"microblaze: Hook into the build-system").
I/O endianness access was then clarified in commit d48751ed4f
("xilinx-ethlite: Simplify byteswapping to/from brams"). Here
the 'fix' was to use tswap32(). Since the machine was built as
big-endian target, tswap32() use means the fix was for a little
endian host. While the datasheet (reference added in file header)
is not precise about it, we interpret such change as the device
expects accesses in big-endian order.
Instead of having a double swapping, one in the core memory layer
due to DEVICE_NATIVE_ENDIAN and a second one with the tswap calls,
allow the machine code to select the proper endianness desired,
removing the need of tswap().
Replace the DEVICE_NATIVE_ENDIAN MemoryRegionOps by a pair of
DEVICE_LITTLE_ENDIAN / DEVICE_BIG_ENDIAN.
Add the "little-endian" property to select the device endianness,
defaulting to little endian.
Set the proper endianness on the single machine using the device.
Signed-off-by: Philippe Mathieu-Daudé <philmd(a)linaro.org>
---
RFC until I digest Paolo's review from v1:
https://lore.kernel.org/qemu-devel/34f6fe2f-06e0-4e2a-a361-2d662f6814b5@r...
---
hw/microblaze/petalogix_s3adsp1800_mmu.c | 1 +
hw/net/xilinx_ethlite.c | 44 +++++++++++++++---------
2 files changed, 28 insertions(+), 17 deletions(-)
diff --git a/hw/microblaze/petalogix_s3adsp1800_mmu.c
b/hw/microblaze/petalogix_s3adsp1800_mmu.c
index af949196d3..f02d343e29 100644
--- a/hw/microblaze/petalogix_s3adsp1800_mmu.c
+++ b/hw/microblaze/petalogix_s3adsp1800_mmu.c
@@ -121,6 +121,7 @@ petalogix_s3adsp1800_init(MachineState *machine)
sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, irq[TIMER_IRQ]);
dev = qdev_new("xlnx.xps-ethernetlite");
+ qdev_prop_set_bit(dev, "little-endian", !TARGET_BIG_ENDIAN);
qemu_configure_nic_device(dev, true, NULL);
qdev_prop_set_uint32(dev, "tx-ping-pong", 0);
qdev_prop_set_uint32(dev, "rx-ping-pong", 0);
diff --git a/hw/net/xilinx_ethlite.c b/hw/net/xilinx_ethlite.c
index e84b4cdd35..5c27f1250d 100644
--- a/hw/net/xilinx_ethlite.c
+++ b/hw/net/xilinx_ethlite.c
@@ -3,6 +3,9 @@
*
* Copyright (c) 2009 Edgar E. Iglesias.
*
+ * DS580: https://docs.amd.com/v/u/en-US/xps_ethernetlite
+ * LogiCORE IP XPS Ethernet Lite Media Access Controller
+ *
* 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
@@ -25,7 +28,6 @@
#include "qemu/osdep.h"
#include "qemu/module.h"
#include "qom/object.h"
-#include "exec/tswap.h"
#include "hw/sysbus.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
@@ -60,6 +62,7 @@ struct xlx_ethlite
{
SysBusDevice parent_obj;
+ bool little_endian_model;
MemoryRegion mmio;
qemu_irq irq;
NICState *nic;
@@ -103,9 +106,10 @@ eth_read(void *opaque, hwaddr addr, unsigned int size)
break;
default:
- r = tswap32(s->regs[addr]);
+ r = s->regs[addr];
break;
}
+
return r;
}
@@ -161,23 +165,26 @@ eth_write(void *opaque, hwaddr addr,
break;
default:
- s->regs[addr] = tswap32(value);
+ s->regs[addr] = value;
break;
}
}
-static const MemoryRegionOps eth_ops = {
- .read = eth_read,
- .write = eth_write,
- .endianness = DEVICE_NATIVE_ENDIAN,
- .impl = {
- .min_access_size = 4,
- .max_access_size = 4,
+static const MemoryRegionOps eth_ops[2] = {
+ [0 ... 1] = {
+ .read = eth_read,
+ .write = eth_write,
+ .impl = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
},
- .valid = {
- .min_access_size = 4,
- .max_access_size = 4
- }
+ [0].endianness = DEVICE_BIG_ENDIAN,
+ [1].endianness = DEVICE_LITTLE_ENDIAN,
};
static bool eth_can_rx(NetClientState *nc)
@@ -237,6 +244,10 @@ static void xilinx_ethlite_realize(DeviceState *dev, Error **errp)
{
struct xlx_ethlite *s = XILINX_ETHLITE(dev);
+ memory_region_init_io(&s->mmio, OBJECT(dev),
+ ð_ops[s->little_endian_model], s,
+ "xlnx.xps-ethernetlite", R_MAX * 4);
+
qemu_macaddr_default_if_unset(&s->conf.macaddr);
s->nic = qemu_new_nic(&net_xilinx_ethlite_info, &s->conf,
object_get_typename(OBJECT(dev)), dev->id,
@@ -249,13 +260,12 @@ static void xilinx_ethlite_init(Object *obj)
struct xlx_ethlite *s = XILINX_ETHLITE(obj);
sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
-
- memory_region_init_io(&s->mmio, obj, ð_ops, s,
- "xlnx.xps-ethernetlite", R_MAX * 4);
sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
}
static Property xilinx_ethlite_properties[] = {
+ DEFINE_PROP_BOOL("little-endian", struct xlx_ethlite,
+ little_endian_model, true),
DEFINE_PROP_UINT32("tx-ping-pong", struct xlx_ethlite, c_tx_pingpong, 1),
DEFINE_PROP_UINT32("rx-ping-pong", struct xlx_ethlite, c_rx_pingpong, 1),
DEFINE_NIC_PROPERTIES(struct xlx_ethlite, conf),
--
2.45.2