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qemu-e2k/hw/m68k/mcf5208.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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/*
* Motorola ColdFire MCF5208 SoC emulation.
*
* Copyright (c) 2007 CodeSourcery.
*
* This code is licensed under the GPL
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qemu/error-report.h"
#include "qemu/log.h"
#include "qapi/error.h"
#include "qemu/datadir.h"
#include "cpu.h"
#include "hw/irq.h"
#include "hw/m68k/mcf.h"
#include "hw/m68k/mcf_fec.h"
#include "qemu/timer.h"
#include "hw/ptimer.h"
#include "sysemu/sysemu.h"
#include "sysemu/qtest.h"
#include "net/net.h"
#include "hw/boards.h"
#include "hw/loader.h"
#include "hw/sysbus.h"
#include "elf.h"
#define SYS_FREQ 166666666
#define ROM_SIZE 0x200000
#define PCSR_EN 0x0001
#define PCSR_RLD 0x0002
#define PCSR_PIF 0x0004
#define PCSR_PIE 0x0008
#define PCSR_OVW 0x0010
#define PCSR_DBG 0x0020
#define PCSR_DOZE 0x0040
#define PCSR_PRE_SHIFT 8
#define PCSR_PRE_MASK 0x0f00
typedef struct {
MemoryRegion iomem;
qemu_irq irq;
ptimer_state *timer;
uint16_t pcsr;
uint16_t pmr;
uint16_t pcntr;
} m5208_timer_state;
static void m5208_timer_update(m5208_timer_state *s)
{
if ((s->pcsr & (PCSR_PIE | PCSR_PIF)) == (PCSR_PIE | PCSR_PIF))
qemu_irq_raise(s->irq);
else
qemu_irq_lower(s->irq);
}
static void m5208_timer_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
m5208_timer_state *s = (m5208_timer_state *)opaque;
int prescale;
int limit;
switch (offset) {
case 0:
/* The PIF bit is set-to-clear. */
if (value & PCSR_PIF) {
s->pcsr &= ~PCSR_PIF;
value &= ~PCSR_PIF;
}
/* Avoid frobbing the timer if we're just twiddling IRQ bits. */
if (((s->pcsr ^ value) & ~PCSR_PIE) == 0) {
s->pcsr = value;
m5208_timer_update(s);
return;
}
ptimer_transaction_begin(s->timer);
if (s->pcsr & PCSR_EN)
ptimer_stop(s->timer);
s->pcsr = value;
prescale = 1 << ((s->pcsr & PCSR_PRE_MASK) >> PCSR_PRE_SHIFT);
ptimer_set_freq(s->timer, (SYS_FREQ / 2) / prescale);
if (s->pcsr & PCSR_RLD)
limit = s->pmr;
else
limit = 0xffff;
ptimer_set_limit(s->timer, limit, 0);
if (s->pcsr & PCSR_EN)
ptimer_run(s->timer, 0);
ptimer_transaction_commit(s->timer);
break;
case 2:
ptimer_transaction_begin(s->timer);
s->pmr = value;
s->pcsr &= ~PCSR_PIF;
if ((s->pcsr & PCSR_RLD) == 0) {
if (s->pcsr & PCSR_OVW)
ptimer_set_count(s->timer, value);
} else {
ptimer_set_limit(s->timer, value, s->pcsr & PCSR_OVW);
}
ptimer_transaction_commit(s->timer);
break;
case 4:
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
__func__, offset);
return;
}
m5208_timer_update(s);
}
static void m5208_timer_trigger(void *opaque)
{
m5208_timer_state *s = (m5208_timer_state *)opaque;
s->pcsr |= PCSR_PIF;
m5208_timer_update(s);
}
static uint64_t m5208_timer_read(void *opaque, hwaddr addr,
unsigned size)
{
m5208_timer_state *s = (m5208_timer_state *)opaque;
switch (addr) {
case 0:
return s->pcsr;
case 2:
return s->pmr;
case 4:
return ptimer_get_count(s->timer);
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
__func__, addr);
return 0;
}
}
static const MemoryRegionOps m5208_timer_ops = {
.read = m5208_timer_read,
.write = m5208_timer_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static uint64_t m5208_sys_read(void *opaque, hwaddr addr,
unsigned size)
{
switch (addr) {
case 0x110: /* SDCS0 */
{
int n;
for (n = 0; n < 32; n++) {
if (current_machine->ram_size < (2u << n)) {
break;
}
}
return (n - 1) | 0x40000000;
}
case 0x114: /* SDCS1 */
return 0;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
__func__, addr);
return 0;
}
}
static void m5208_sys_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
__func__, addr);
}
static const MemoryRegionOps m5208_sys_ops = {
.read = m5208_sys_read,
.write = m5208_sys_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic)
{
MemoryRegion *iomem = g_new(MemoryRegion, 1);
m5208_timer_state *s;
int i;
/* SDRAMC. */
memory_region_init_io(iomem, NULL, &m5208_sys_ops, NULL, "m5208-sys", 0x00004000);
memory_region_add_subregion(address_space, 0xfc0a8000, iomem);
/* Timers. */
for (i = 0; i < 2; i++) {
s = g_new0(m5208_timer_state, 1);
s->timer = ptimer_init(m5208_timer_trigger, s, PTIMER_POLICY_LEGACY);
memory_region_init_io(&s->iomem, NULL, &m5208_timer_ops, s,
"m5208-timer", 0x00004000);
memory_region_add_subregion(address_space, 0xfc080000 + 0x4000 * i,
&s->iomem);
s->irq = pic[4 + i];
}
}
static void mcf_fec_init(MemoryRegion *sysmem, NICInfo *nd, hwaddr base,
qemu_irq *irqs)
{
DeviceState *dev;
SysBusDevice *s;
int i;
qemu_check_nic_model(nd, TYPE_MCF_FEC_NET);
dev = qdev_new(TYPE_MCF_FEC_NET);
qdev_set_nic_properties(dev, nd);
s = SYS_BUS_DEVICE(dev);
sysbus_realize_and_unref(s, &error_fatal);
for (i = 0; i < FEC_NUM_IRQ; i++) {
sysbus_connect_irq(s, i, irqs[i]);
}
memory_region_add_subregion(sysmem, base, sysbus_mmio_get_region(s, 0));
}
static void mcf5208evb_init(MachineState *machine)
{
ram_addr_t ram_size = machine->ram_size;
const char *kernel_filename = machine->kernel_filename;
M68kCPU *cpu;
CPUM68KState *env;
int kernel_size;
uint64_t elf_entry;
hwaddr entry;
qemu_irq *pic;
MemoryRegion *address_space_mem = get_system_memory();
MemoryRegion *rom = g_new(MemoryRegion, 1);
MemoryRegion *sram = g_new(MemoryRegion, 1);
cpu = M68K_CPU(cpu_create(machine->cpu_type));
env = &cpu->env;
/* Initialize CPU registers. */
env->vbr = 0;
/* TODO: Configure BARs. */
/* ROM at 0x00000000 */
memory_region_init_rom(rom, NULL, "mcf5208.rom", ROM_SIZE, &error_fatal);
memory_region_add_subregion(address_space_mem, 0x00000000, rom);
/* DRAM at 0x40000000 */
memory_region_add_subregion(address_space_mem, 0x40000000, machine->ram);
/* Internal SRAM. */
memory_region_init_ram(sram, NULL, "mcf5208.sram", 16 * KiB, &error_fatal);
memory_region_add_subregion(address_space_mem, 0x80000000, sram);
/* Internal peripherals. */
pic = mcf_intc_init(address_space_mem, 0xfc048000, cpu);
mcf_uart_mm_init(0xfc060000, pic[26], serial_hd(0));
mcf_uart_mm_init(0xfc064000, pic[27], serial_hd(1));
mcf_uart_mm_init(0xfc068000, pic[28], serial_hd(2));
mcf5208_sys_init(address_space_mem, pic);
if (nb_nics > 1) {
error_report("Too many NICs");
exit(1);
}
if (nd_table[0].used) {
mcf_fec_init(address_space_mem, &nd_table[0],
0xfc030000, pic + 36);
}
g_free(pic);
/* 0xfc000000 SCM. */
/* 0xfc004000 XBS. */
/* 0xfc008000 FlexBus CS. */
/* 0xfc030000 FEC. */
/* 0xfc040000 SCM + Power management. */
/* 0xfc044000 eDMA. */
/* 0xfc048000 INTC. */
/* 0xfc058000 I2C. */
/* 0xfc05c000 QSPI. */
/* 0xfc060000 UART0. */
/* 0xfc064000 UART0. */
/* 0xfc068000 UART0. */
/* 0xfc070000 DMA timers. */
/* 0xfc080000 PIT0. */
/* 0xfc084000 PIT1. */
/* 0xfc088000 EPORT. */
/* 0xfc08c000 Watchdog. */
/* 0xfc090000 clock module. */
/* 0xfc0a0000 CCM + reset. */
/* 0xfc0a4000 GPIO. */
/* 0xfc0a8000 SDRAM controller. */
/* Load firmware */
if (machine->firmware) {
char *fn;
uint8_t *ptr;
fn = qemu_find_file(QEMU_FILE_TYPE_BIOS, machine->firmware);
if (!fn) {
error_report("Could not find ROM image '%s'", machine->firmware);
exit(1);
}
if (load_image_targphys(fn, 0x0, ROM_SIZE) < 8) {
error_report("Could not load ROM image '%s'", machine->firmware);
exit(1);
}
g_free(fn);
/* Initial PC is always at offset 4 in firmware binaries */
ptr = rom_ptr(0x4, 4);
assert(ptr != NULL);
env->pc = ldl_p(ptr);
}
/* Load kernel. */
if (!kernel_filename) {
if (qtest_enabled() || machine->firmware) {
return;
}
error_report("Kernel image must be specified");
exit(1);
}
kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, &elf_entry,
NULL, NULL, NULL, 1, EM_68K, 0, 0);
entry = elf_entry;
if (kernel_size < 0) {
kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
NULL, NULL);
}
if (kernel_size < 0) {
kernel_size = load_image_targphys(kernel_filename, 0x40000000,
ram_size);
entry = 0x40000000;
}
if (kernel_size < 0) {
error_report("Could not load kernel '%s'", kernel_filename);
exit(1);
}
env->pc = entry;
}
static void mcf5208evb_machine_init(MachineClass *mc)
{
mc->desc = "MCF5208EVB";
mc->init = mcf5208evb_init;
mc->is_default = true;
mc->default_cpu_type = M68K_CPU_TYPE_NAME("m5208");
mc->default_ram_id = "mcf5208.ram";
}
DEFINE_MACHINE("mcf5208evb", mcf5208evb_machine_init)
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