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qemu-e2k/hw/arm/mps2.c
Stefan Hajnoczi a1c5a06224 hw/arm: make bitbanded IO optional on ARMv7-M 
Some ARM CPUs have bitbanded IO, a memory region that allows convenient
bit access via 32-bit memory loads/stores.  This eliminates the need for
read-modify-update instruction sequences.

This patch makes this optional feature an ARMv7MState qdev property,
allowing boards to choose whether they want bitbanding or not.

Status of boards:
 * iotkit (Cortex M33), no bitband
 * mps2 (Cortex M3), bitband
 * msf2 (Cortex M3), bitband
 * stellaris (Cortex M3), bitband
 * stm32f205 (Cortex M3), bitband

As a side-effect of this patch, Peter Maydell noted that the Ethernet
controller on mps2 board is now accessible.  Previously they were hidden
by the bitband region (which does not exist on the real board).

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180814162739.11814-2-stefanha@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-08-16 14:05:28 +01:00

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/*
* ARM V2M MPS2 board 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.
*/
/* The MPS2 and MPS2+ dev boards are FPGA based (the 2+ has a bigger
* FPGA but is otherwise the same as the 2). Since the CPU itself
* and most of the devices are in the FPGA, the details of the board
* as seen by the guest depend significantly on the FPGA image.
* We model the following FPGA images:
* "mps2-an385" -- Cortex-M3 as documented in ARM Application Note AN385
* "mps2-an511" -- Cortex-M3 'DesignStart' as documented in AN511
*
* Links to the TRM for the board itself and to the various Application
* Notes which document the FPGA images can be found here:
* https://developer.arm.com/products/system-design/development-boards/cortex-m-prototyping-system
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "hw/arm/arm.h"
#include "hw/arm/armv7m.h"
#include "hw/or-irq.h"
#include "hw/boards.h"
#include "exec/address-spaces.h"
#include "sysemu/sysemu.h"
#include "hw/misc/unimp.h"
#include "hw/char/cmsdk-apb-uart.h"
#include "hw/timer/cmsdk-apb-timer.h"
#include "hw/misc/mps2-scc.h"
#include "hw/devices.h"
#include "net/net.h"
typedef enum MPS2FPGAType {
FPGA_AN385,
FPGA_AN511,
} MPS2FPGAType;
typedef struct {
MachineClass parent;
MPS2FPGAType fpga_type;
uint32_t scc_id;
} MPS2MachineClass;
typedef struct {
MachineState parent;
ARMv7MState armv7m;
MemoryRegion psram;
MemoryRegion ssram1;
MemoryRegion ssram1_m;
MemoryRegion ssram23;
MemoryRegion ssram23_m;
MemoryRegion blockram;
MemoryRegion blockram_m1;
MemoryRegion blockram_m2;
MemoryRegion blockram_m3;
MemoryRegion sram;
MPS2SCC scc;
} MPS2MachineState;
#define TYPE_MPS2_MACHINE "mps2"
#define TYPE_MPS2_AN385_MACHINE MACHINE_TYPE_NAME("mps2-an385")
#define TYPE_MPS2_AN511_MACHINE MACHINE_TYPE_NAME("mps2-an511")
#define MPS2_MACHINE(obj) \
OBJECT_CHECK(MPS2MachineState, obj, TYPE_MPS2_MACHINE)
#define MPS2_MACHINE_GET_CLASS(obj) \
OBJECT_GET_CLASS(MPS2MachineClass, obj, TYPE_MPS2_MACHINE)
#define MPS2_MACHINE_CLASS(klass) \
OBJECT_CLASS_CHECK(MPS2MachineClass, klass, TYPE_MPS2_MACHINE)
/* Main SYSCLK frequency in Hz */
#define SYSCLK_FRQ 25000000
/* Initialize the auxiliary RAM region @mr and map it into
* the memory map at @base.
*/
static void make_ram(MemoryRegion *mr, const char *name,
hwaddr base, hwaddr size)
{
memory_region_init_ram(mr, NULL, name, size, &error_fatal);
memory_region_add_subregion(get_system_memory(), base, mr);
}
/* Create an alias of an entire original MemoryRegion @orig
* located at @base in the memory map.
*/
static void make_ram_alias(MemoryRegion *mr, const char *name,
MemoryRegion *orig, hwaddr base)
{
memory_region_init_alias(mr, NULL, name, orig, 0,
memory_region_size(orig));
memory_region_add_subregion(get_system_memory(), base, mr);
}
static void mps2_common_init(MachineState *machine)
{
MPS2MachineState *mms = MPS2_MACHINE(machine);
MPS2MachineClass *mmc = MPS2_MACHINE_GET_CLASS(machine);
MemoryRegion *system_memory = get_system_memory();
MachineClass *mc = MACHINE_GET_CLASS(machine);
DeviceState *armv7m, *sccdev;
if (strcmp(machine->cpu_type, mc->default_cpu_type) != 0) {
error_report("This board can only be used with CPU %s",
mc->default_cpu_type);
exit(1);
}
/* The FPGA images have an odd combination of different RAMs,
* because in hardware they are different implementations and
* connected to different buses, giving varying performance/size
* tradeoffs. For QEMU they're all just RAM, though. We arbitrarily
* call the 16MB our "system memory", as it's the largest lump.
*
* Common to both boards:
* 0x21000000..0x21ffffff : PSRAM (16MB)
* AN385 only:
* 0x00000000 .. 0x003fffff : ZBT SSRAM1
* 0x00400000 .. 0x007fffff : mirror of ZBT SSRAM1
* 0x20000000 .. 0x203fffff : ZBT SSRAM 2&3
* 0x20400000 .. 0x207fffff : mirror of ZBT SSRAM 2&3
* 0x01000000 .. 0x01003fff : block RAM (16K)
* 0x01004000 .. 0x01007fff : mirror of above
* 0x01008000 .. 0x0100bfff : mirror of above
* 0x0100c000 .. 0x0100ffff : mirror of above
* AN511 only:
* 0x00000000 .. 0x0003ffff : FPGA block RAM
* 0x00400000 .. 0x007fffff : ZBT SSRAM1
* 0x20000000 .. 0x2001ffff : SRAM
* 0x20400000 .. 0x207fffff : ZBT SSRAM 2&3
*
* The AN385 has a feature where the lowest 16K can be mapped
* either to the bottom of the ZBT SSRAM1 or to the block RAM.
* This is of no use for QEMU so we don't implement it (as if
* zbt_boot_ctrl is always zero).
*/
memory_region_allocate_system_memory(&mms->psram,
NULL, "mps.ram", 0x1000000);
memory_region_add_subregion(system_memory, 0x21000000, &mms->psram);
switch (mmc->fpga_type) {
case FPGA_AN385:
make_ram(&mms->ssram1, "mps.ssram1", 0x0, 0x400000);
make_ram_alias(&mms->ssram1_m, "mps.ssram1_m", &mms->ssram1, 0x400000);
make_ram(&mms->ssram23, "mps.ssram23", 0x20000000, 0x400000);
make_ram_alias(&mms->ssram23_m, "mps.ssram23_m",
&mms->ssram23, 0x20400000);
make_ram(&mms->blockram, "mps.blockram", 0x01000000, 0x4000);
make_ram_alias(&mms->blockram_m1, "mps.blockram_m1",
&mms->blockram, 0x01004000);
make_ram_alias(&mms->blockram_m2, "mps.blockram_m2",
&mms->blockram, 0x01008000);
make_ram_alias(&mms->blockram_m3, "mps.blockram_m3",
&mms->blockram, 0x0100c000);
break;
case FPGA_AN511:
make_ram(&mms->blockram, "mps.blockram", 0x0, 0x40000);
make_ram(&mms->ssram1, "mps.ssram1", 0x00400000, 0x00800000);
make_ram(&mms->sram, "mps.sram", 0x20000000, 0x20000);
make_ram(&mms->ssram23, "mps.ssram23", 0x20400000, 0x400000);
break;
default:
g_assert_not_reached();
}
object_initialize(&mms->armv7m, sizeof(mms->armv7m), TYPE_ARMV7M);
armv7m = DEVICE(&mms->armv7m);
qdev_set_parent_bus(armv7m, sysbus_get_default());
switch (mmc->fpga_type) {
case FPGA_AN385:
qdev_prop_set_uint32(armv7m, "num-irq", 32);
break;
case FPGA_AN511:
qdev_prop_set_uint32(armv7m, "num-irq", 64);
break;
default:
g_assert_not_reached();
}
qdev_prop_set_string(armv7m, "cpu-type", machine->cpu_type);
qdev_prop_set_bit(armv7m, "enable-bitband", true);
object_property_set_link(OBJECT(&mms->armv7m), OBJECT(system_memory),
"memory", &error_abort);
object_property_set_bool(OBJECT(&mms->armv7m), true, "realized",
&error_fatal);
create_unimplemented_device("zbtsmram mirror", 0x00400000, 0x00400000);
create_unimplemented_device("RESERVED 1", 0x00800000, 0x00800000);
create_unimplemented_device("Block RAM", 0x01000000, 0x00010000);
create_unimplemented_device("RESERVED 2", 0x01010000, 0x1EFF0000);
create_unimplemented_device("RESERVED 3", 0x20800000, 0x00800000);
create_unimplemented_device("PSRAM", 0x21000000, 0x01000000);
/* These three ranges all cover multiple devices; we may implement
* some of them below (in which case the real device takes precedence
* over the unimplemented-region mapping).
*/
create_unimplemented_device("CMSDK APB peripheral region @0x40000000",
0x40000000, 0x00010000);
create_unimplemented_device("CMSDK peripheral region @0x40010000",
0x40010000, 0x00010000);
create_unimplemented_device("Extra peripheral region @0x40020000",
0x40020000, 0x00010000);
create_unimplemented_device("RESERVED 4", 0x40030000, 0x001D0000);
create_unimplemented_device("VGA", 0x41000000, 0x0200000);
switch (mmc->fpga_type) {
case FPGA_AN385:
{
/* The overflow IRQs for UARTs 0, 1 and 2 are ORed together.
* Overflow for UARTs 4 and 5 doesn't trigger any interrupt.
*/
Object *orgate;
DeviceState *orgate_dev;
int i;
orgate = object_new(TYPE_OR_IRQ);
object_property_set_int(orgate, 6, "num-lines", &error_fatal);
object_property_set_bool(orgate, true, "realized", &error_fatal);
orgate_dev = DEVICE(orgate);
qdev_connect_gpio_out(orgate_dev, 0, qdev_get_gpio_in(armv7m, 12));
for (i = 0; i < 5; i++) {
static const hwaddr uartbase[] = {0x40004000, 0x40005000,
0x40006000, 0x40007000,
0x40009000};
/* RX irq number; TX irq is always one greater */
static const int uartirq[] = {0, 2, 4, 18, 20};
qemu_irq txovrint = NULL, rxovrint = NULL;
if (i < 3) {
txovrint = qdev_get_gpio_in(orgate_dev, i * 2);
rxovrint = qdev_get_gpio_in(orgate_dev, i * 2 + 1);
}
cmsdk_apb_uart_create(uartbase[i],
qdev_get_gpio_in(armv7m, uartirq[i] + 1),
qdev_get_gpio_in(armv7m, uartirq[i]),
txovrint, rxovrint,
NULL,
serial_hd(i), SYSCLK_FRQ);
}
break;
}
case FPGA_AN511:
{
/* The overflow IRQs for all UARTs are ORed together.
* Tx and Rx IRQs for each UART are ORed together.
*/
Object *orgate;
DeviceState *orgate_dev;
int i;
orgate = object_new(TYPE_OR_IRQ);
object_property_set_int(orgate, 10, "num-lines", &error_fatal);
object_property_set_bool(orgate, true, "realized", &error_fatal);
orgate_dev = DEVICE(orgate);
qdev_connect_gpio_out(orgate_dev, 0, qdev_get_gpio_in(armv7m, 12));
for (i = 0; i < 5; i++) {
/* system irq numbers for the combined tx/rx for each UART */
static const int uart_txrx_irqno[] = {0, 2, 45, 46, 56};
static const hwaddr uartbase[] = {0x40004000, 0x40005000,
0x4002c000, 0x4002d000,
0x4002e000};
Object *txrx_orgate;
DeviceState *txrx_orgate_dev;
txrx_orgate = object_new(TYPE_OR_IRQ);
object_property_set_int(txrx_orgate, 2, "num-lines", &error_fatal);
object_property_set_bool(txrx_orgate, true, "realized",
&error_fatal);
txrx_orgate_dev = DEVICE(txrx_orgate);
qdev_connect_gpio_out(txrx_orgate_dev, 0,
qdev_get_gpio_in(armv7m, uart_txrx_irqno[i]));
cmsdk_apb_uart_create(uartbase[i],
qdev_get_gpio_in(txrx_orgate_dev, 0),
qdev_get_gpio_in(txrx_orgate_dev, 1),
qdev_get_gpio_in(orgate_dev, i * 2),
qdev_get_gpio_in(orgate_dev, i * 2 + 1),
NULL,
serial_hd(i), SYSCLK_FRQ);
}
break;
}
default:
g_assert_not_reached();
}
cmsdk_apb_timer_create(0x40000000, qdev_get_gpio_in(armv7m, 8), SYSCLK_FRQ);
cmsdk_apb_timer_create(0x40001000, qdev_get_gpio_in(armv7m, 9), SYSCLK_FRQ);
object_initialize(&mms->scc, sizeof(mms->scc), TYPE_MPS2_SCC);
sccdev = DEVICE(&mms->scc);
qdev_set_parent_bus(sccdev, sysbus_get_default());
qdev_prop_set_uint32(sccdev, "scc-cfg4", 0x2);
qdev_prop_set_uint32(sccdev, "scc-aid", 0x02000008);
qdev_prop_set_uint32(sccdev, "scc-id", mmc->scc_id);
object_property_set_bool(OBJECT(&mms->scc), true, "realized",
&error_fatal);
sysbus_mmio_map(SYS_BUS_DEVICE(sccdev), 0, 0x4002f000);
/* In hardware this is a LAN9220; the LAN9118 is software compatible
* except that it doesn't support the checksum-offload feature.
*/
lan9118_init(&nd_table[0], 0x40200000,
qdev_get_gpio_in(armv7m,
mmc->fpga_type == FPGA_AN385 ? 13 : 47));
system_clock_scale = NANOSECONDS_PER_SECOND / SYSCLK_FRQ;
armv7m_load_kernel(ARM_CPU(first_cpu), machine->kernel_filename,
0x400000);
}
static void mps2_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
mc->init = mps2_common_init;
mc->max_cpus = 1;
}
static void mps2_an385_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
MPS2MachineClass *mmc = MPS2_MACHINE_CLASS(oc);
mc->desc = "ARM MPS2 with AN385 FPGA image for Cortex-M3";
mmc->fpga_type = FPGA_AN385;
mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-m3");
mmc->scc_id = 0x41040000 | (385 << 4);
}
static void mps2_an511_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
MPS2MachineClass *mmc = MPS2_MACHINE_CLASS(oc);
mc->desc = "ARM MPS2 with AN511 DesignStart FPGA image for Cortex-M3";
mmc->fpga_type = FPGA_AN511;
mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-m3");
mmc->scc_id = 0x4104000 | (511 << 4);
}
static const TypeInfo mps2_info = {
.name = TYPE_MPS2_MACHINE,
.parent = TYPE_MACHINE,
.abstract = true,
.instance_size = sizeof(MPS2MachineState),
.class_size = sizeof(MPS2MachineClass),
.class_init = mps2_class_init,
};
static const TypeInfo mps2_an385_info = {
.name = TYPE_MPS2_AN385_MACHINE,
.parent = TYPE_MPS2_MACHINE,
.class_init = mps2_an385_class_init,
};
static const TypeInfo mps2_an511_info = {
.name = TYPE_MPS2_AN511_MACHINE,
.parent = TYPE_MPS2_MACHINE,
.class_init = mps2_an511_class_init,
};
static void mps2_machine_init(void)
{
type_register_static(&mps2_info);
type_register_static(&mps2_an385_info);
type_register_static(&mps2_an511_info);
}
type_init(mps2_machine_init);
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