qemu-e2k/hw/mcf5208.c

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/*
* Motorola ColdFire MCF5208 SoC emulation.
*
* Copyright (c) 2007 CodeSourcery.
*
* This code is licenced under the GPL
*/
#include "hw.h"
#include "mcf.h"
#include "qemu-timer.h"
#include "sysemu.h"
#include "net.h"
#include "boards.h"
#define SYS_FREQ 66000000
#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 {
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(m5208_timer_state *s, int offset,
uint32_t value)
{
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;
}
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);
break;
case 2:
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);
}
break;
case 4:
break;
default:
/* Should never happen. */
abort();
}
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);
}
typedef struct {
m5208_timer_state timer[2];
} m5208_sys_state;
static uint32_t m5208_sys_read(void *opaque, target_phys_addr_t addr)
{
m5208_sys_state *s = (m5208_sys_state *)opaque;
switch (addr) {
/* PIT0 */
case 0xfc080000:
return s->timer[0].pcsr;
case 0xfc080002:
return s->timer[0].pmr;
case 0xfc080004:
return ptimer_get_count(s->timer[0].timer);
/* PIT1 */
case 0xfc084000:
return s->timer[1].pcsr;
case 0xfc084002:
return s->timer[1].pmr;
case 0xfc084004:
return ptimer_get_count(s->timer[1].timer);
/* SDRAM Controller. */
case 0xfc0a8110: /* SDCS0 */
{
int n;
for (n = 0; n < 32; n++) {
if (ram_size < (2u << n))
break;
}
return (n - 1) | 0x40000000;
}
case 0xfc0a8114: /* SDCS1 */
return 0;
default:
cpu_abort(cpu_single_env, "m5208_sys_read: Bad offset 0x%x\n",
(int)addr);
return 0;
}
}
static void m5208_sys_write(void *opaque, target_phys_addr_t addr,
uint32_t value)
{
m5208_sys_state *s = (m5208_sys_state *)opaque;
switch (addr) {
/* PIT0 */
case 0xfc080000:
case 0xfc080002:
case 0xfc080004:
m5208_timer_write(&s->timer[0], addr & 0xf, value);
return;
/* PIT1 */
case 0xfc084000:
case 0xfc084002:
case 0xfc084004:
m5208_timer_write(&s->timer[1], addr & 0xf, value);
return;
default:
cpu_abort(cpu_single_env, "m5208_sys_write: Bad offset 0x%x\n",
(int)addr);
break;
}
}
static CPUReadMemoryFunc *m5208_sys_readfn[] = {
m5208_sys_read,
m5208_sys_read,
m5208_sys_read
};
static CPUWriteMemoryFunc *m5208_sys_writefn[] = {
m5208_sys_write,
m5208_sys_write,
m5208_sys_write
};
static void mcf5208_sys_init(qemu_irq *pic)
{
int iomemtype;
m5208_sys_state *s;
QEMUBH *bh;
int i;
s = (m5208_sys_state *)qemu_mallocz(sizeof(m5208_sys_state));
iomemtype = cpu_register_io_memory(0, m5208_sys_readfn,
m5208_sys_writefn, s);
/* SDRAMC. */
cpu_register_physical_memory(0xfc0a8000, 0x00004000, iomemtype);
/* Timers. */
for (i = 0; i < 2; i++) {
bh = qemu_bh_new(m5208_timer_trigger, &s->timer[i]);
s->timer[i].timer = ptimer_init(bh);
cpu_register_physical_memory(0xfc080000 + 0x4000 * i, 0x00004000,
iomemtype);
s->timer[i].irq = pic[4 + i];
}
}
static void mcf5208evb_init(ram_addr_t ram_size, int vga_ram_size,
const char *boot_device, DisplayState *ds,
const char *kernel_filename, const char *kernel_cmdline,
const char *initrd_filename, const char *cpu_model)
{
CPUState *env;
int kernel_size;
uint64_t elf_entry;
target_ulong entry;
qemu_irq *pic;
if (!cpu_model)
cpu_model = "m5208";
env = cpu_init(cpu_model);
if (!env) {
fprintf(stderr, "Unable to find m68k CPU definition\n");
exit(1);
}
/* Initialize CPU registers. */
env->vbr = 0;
/* TODO: Configure BARs. */
/* DRAM at 0x20000000 */
cpu_register_physical_memory(0x40000000, ram_size,
qemu_ram_alloc(ram_size) | IO_MEM_RAM);
/* Internal SRAM. */
cpu_register_physical_memory(0x80000000, 16384,
qemu_ram_alloc(16384) | IO_MEM_RAM);
/* Internal peripherals. */
pic = mcf_intc_init(0xfc048000, env);
mcf_uart_mm_init(0xfc060000, pic[26], serial_hds[0]);
mcf_uart_mm_init(0xfc064000, pic[27], serial_hds[1]);
mcf_uart_mm_init(0xfc068000, pic[28], serial_hds[2]);
mcf5208_sys_init(pic);
if (nb_nics > 1) {
fprintf(stderr, "Too many NICs\n");
exit(1);
}
if (nd_table[0].vlan) {
if (nd_table[0].model == NULL
|| strcmp(nd_table[0].model, "mcf_fec") == 0) {
mcf_fec_init(&nd_table[0], 0xfc030000, pic + 36);
} else if (strcmp(nd_table[0].model, "?") == 0) {
fprintf(stderr, "qemu: Supported NICs: mcf_fec\n");
exit (1);
} else {
fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);
exit (1);
}
}
/* 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 kernel. */
if (!kernel_filename) {
fprintf(stderr, "Kernel image must be specified\n");
exit(1);
}
kernel_size = load_elf(kernel_filename, 0, &elf_entry, NULL, NULL);
entry = elf_entry;
if (kernel_size < 0) {
kernel_size = load_uboot(kernel_filename, &entry, NULL);
}
if (kernel_size < 0) {
kernel_size = load_image(kernel_filename, phys_ram_base);
entry = 0x20000000;
}
if (kernel_size < 0) {
fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
exit(1);
}
env->pc = entry;
}
QEMUMachine mcf5208evb_machine = {
"mcf5208evb",
"MCF5206EVB",
mcf5208evb_init,
16384,
};