/*
* Copyright (C) 1998, 1999 Jesper Skov
*
* Basically what is needed to replace functionality found in
* arch/m68k allowing Amiga drivers to work under APUS.
* Bits of code and/or ideas from arch/m68k and arch/ppc files.
*
* TODO:
* This file needs a *really* good cleanup. Restructure and optimize.
* Make sure it can be compiled for non-APUS configs. Begin to move
* Amiga specific stuff into mach/amiga.
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/seq_file.h>
/* Needs INITSERIAL call in head.S! */
#undef APUS_DEBUG
#include <asm/bootinfo.h>
#include <asm/setup.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/amigappc.h>
#include <asm/pgtable.h>
#include <asm/dma.h>
#include <asm/machdep.h>
#include <asm/time.h>
unsigned long m68k_machtype;
char debug_device[6] = "";
extern void amiga_init_IRQ(void);
extern void apus_setup_pci_ptrs(void);
void (*mach_sched_init) (void (*handler)(int, void *, struct pt_regs *)) __initdata = NULL;
/* machine dependent irq functions */
void (*mach_init_IRQ) (void) __initdata = NULL;
void (*(*mach_default_handler)[]) (int, void *, struct pt_regs *) = NULL;
void (*mach_get_model) (char *model) = NULL;
int (*mach_get_hardware_list) (char *buffer) = NULL;
int (*mach_get_irq_list) (struct seq_file *, void *) = NULL;
void (*mach_process_int) (int, struct pt_regs *) = NULL;
/* machine dependent timer functions */
unsigned long (*mach_gettimeoffset) (void);
void (*mach_gettod) (int*, int*, int*, int*, int*, int*);
int (*mach_hwclk) (int, struct hwclk_time*) = NULL;
int (*mach_set_clock_mmss) (unsigned long) = NULL;
void (*mach_reset)( void );
long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
#ifdef CONFIG_HEARTBEAT
void (*mach_heartbeat) (int) = NULL;
extern void apus_heartbeat (void);
#endif
extern unsigned long amiga_model;
extern unsigned decrementer_count;/* count value for 1e6/HZ microseconds */
extern unsigned count_period_num; /* 1 decrementer count equals */
extern unsigned count_period_den; /* count_period_num / count_period_den us */
int num_memory = 0;
struct mem_info memory[NUM_MEMINFO];/* memory description */
/* FIXME: Duplicate memory data to avoid conflicts with m68k shared code. */
int m68k_realnum_memory = 0;
struct mem_info m68k_memory[NUM_MEMINFO];/* memory description */
struct mem_info ramdisk;
extern void config_amiga(void);
static int __60nsram = 0;
/* for cpuinfo */
static int __bus_speed = 0;
static int __speed_test_failed = 0;
/********************************************** COMPILE PROTECTION */
/* Provide some stubs that links to Amiga specific functions.
* This allows CONFIG_APUS to be removed from generic PPC files while
* preventing link errors for other PPC targets.
*/
unsigned long apus_get_rtc_time(void)
{
#ifdef CONFIG_APUS
extern unsigned long m68k_get_rtc_time(void);
return m68k_get_rtc_time ();
#else
return 0;
#endif
}
int apus_set_rtc_time(unsigned long nowtime)
{
#ifdef CONFIG_APUS
extern int m68k_set_rtc_time(unsigned long nowtime);
return m68k_set_rtc_time (nowtime);
#else
return 0;
#endif
}
/*********************************************************** SETUP */
/* From arch/m68k/kernel/setup.c. */
void __init apus_setup_arch(void)
{
#ifdef CONFIG_APUS
extern char cmd_line[];
int i;
char *p, *q;
/* Let m68k-shared code know it should do the Amiga thing. */
m68k_machtype = MACH_AMIGA;
/* Parse the command line for arch-specific options.
* For the m68k, this is currently only "debug=xxx" to enable printing
* certain kernel messages to some machine-specific device. */
for( p = cmd_line; p && *p; ) {
i = 0;
if (!strncmp( p, "debug=", 6 )) {
strlcpy( debug_device, p+6, sizeof(debug_device) );
if ((q = strchr( debug_device, ' ' ))) *q = 0;
i = 1;
} else if (!strncmp( p, "60nsram", 7 )) {
APUS_WRITE (APUS_REG_WAITSTATE,
REGWAITSTATE_SETRESET
|REGWAITSTATE_PPCR
|REGWAITSTATE_PPCW);
__60nsram = 1;
i = 1;
}
if (i) {
/* option processed, delete it */
if ((q = strchr( p, ' ' )))
strcpy( p, q+1 );
else
*p = 0;
} else {
if ((p = strchr( p, ' ' ))) ++p;
}
}
config_amiga();
#if 0 /* Enable for logging - also include logging.o in Makefile rule */
{
#define LOG_SIZE 4096
void* base;
/* Throw away some memory - the P5 firmare stomps on top
* of CHIP memory during bootup.
*/
amiga_chip_alloc(0x1000);
base = amiga_chip_alloc(LOG_SIZE+sizeof(klog_data_t));
LOG_INIT(base, base+sizeof(klog_data_t), LOG_SIZE);
}
#endif
#endif
}
int
apus_show_cpuinfo(struct seq_file *m)
{
extern int __map_without_bats;
extern unsigned long powerup_PCI_present;
seq_printf(m, "machine\t\t: Amiga\n");
seq_printf(m, "bus speed\t: %d%s", __bus_speed,
(__speed_test_failed) ? " [failed]\n" : "\n");
seq_printf(m, "using BATs\t: %s\n",
(__map_without_bats) ? "No" : "Yes");
seq_printf(m, "ram speed\t: %dns\n", (__60nsram) ? 60 : 70);
seq_printf(m, "PCI bridge\t: %s\n",
(powerup_PCI_present) ? "Yes" : "No");
return 0;
}
static void get_current_tb(unsigned long long *time)
{
__asm __volatile ("1:mftbu 4 \n\t"
" mftb 5 \n\t"
" mftbu 6 \n\t"
" cmpw 4,6 \n\t"
" bne 1b \n\t"
" stw 4,0(%0)\n\t"
" stw 5,4(%0)\n\t"
:
: "r" (time)
: "r4", "r5", "r6");
}
void apus_calibrate_decr(void)
{
#ifdef CONFIG_APUS
unsigned long freq;
/* This algorithm for determining the bus speed was
contributed by Ralph Schmidt. */
unsigned long long start, stop;
int bus_speed;
int speed_test_failed = 0;
{
unsigned long loop = amiga_eclock / 10;
get_current_tb (&start);
while (loop--) {
unsigned char tmp;
tmp = ciaa.pra;
}
get_current_tb (&stop);
}
bus_speed = (((unsigned long)(stop-start))*10*4) / 1000000;
if (AMI_1200 == amiga_model)
bus_speed /= 2;
if ((bus_speed >= 47) && (bus_speed < 53)) {
bus_speed = 50;
freq = 12500000;
} else if ((bus_speed >= 57) && (bus_speed < 63)) {
bus_speed = 60;
freq = 15000000;
} else if ((bus_speed >= 63) && (bus_speed < 69)) {
bus_speed = 67;
freq = 16666667;
} else {
printk ("APUS: Unable to determine bus speed (%d). "
"Defaulting to 50MHz", bus_speed);
bus_speed = 50;
freq = 12500000;
speed_test_failed = 1;
}
/* Ease diagnostics... */
{
extern int __map_without_bats;
extern unsigned long powerup_PCI_present;
printk ("APUS: BATs=%d, BUS=%dMHz",
(__map_without_bats) ? 0 : 1,
bus_speed);
if (speed_test_failed)
printk ("[FAILED - please report]");
printk (", RAM=%dns, PCI bridge=%d\n",
(__60nsram) ? 60 : 70,
(powerup_PCI_present) ? 1 : 0);
/* print a bit more if asked politely... */
if (!(ciaa.pra & 0x40)){
extern unsigned int bat_addrs[4][3];
int b;
for (b = 0; b < 4; ++b) {
printk ("APUS: BAT%d ", b);
printk ("%08x-%08x -> %08x\n",
bat_addrs[b][0],
bat_addrs[b][1],
bat_addrs[b][2]);
}
}
}
printk("time_init: decrementer frequency = %lu.%.6lu MHz\n",
freq/1000000, freq%1000000);
tb_ticks_per_jiffy = freq / HZ;
tb_to_us = mulhwu_scale_factor(freq, 1000000);
__bus_speed = bus_speed;
__speed_test_failed = speed_test_failed;
#endif
}
void arch_gettod(int *year, int *mon, int *day, int *hour,
int *min, int *sec)
{
#ifdef CONFIG_APUS
if (mach_gettod)
mach_gettod(year, mon, day, hour, min, sec);
else
*year = *mon = *day = *hour = *min = *sec = 0;
#endif
}
/* for "kbd-reset" cmdline param */
__init
void kbd_reset_setup(char *str, int *ints)
{
}
/*********************************************************** MEMORY */
#define KMAP_MAX 32
unsigned long kmap_chunks[KMAP_MAX*3];
int kmap_chunk_count = 0;
/* From pgtable.h */
static __inline__ pte_t *my_find_pte(struct mm_struct *mm,unsigned long va)
{
pgd_t *dir = 0;
pmd_t *pmd = 0;
pte_t *pte = 0;
va &= PAGE_MASK;
dir = pgd_offset( mm, va );
if (dir)
{
pmd = pmd_offset(dir, va & PAGE_MASK);
if (pmd && pmd_present(*pmd))
{
pte = pte_offset(pmd, va);
}
}
return pte;
}
/* Again simulating an m68k/mm/kmap.c function. */
void kernel_set_cachemode( unsigned long address, unsigned long size,
unsigned int cmode )
{
unsigned long mask, flags;
switch (cmode)
{
case IOMAP_FULL_CACHING:
mask = ~(_PAGE_NO_CACHE | _PAGE_GUARDED);
flags = 0;
break;
case IOMAP_NOCACHE_SER:
mask = ~0;
flags = (_PAGE_NO_CACHE | _PAGE_GUARDED);
break;
default:
panic ("kernel_set_cachemode() doesn't support mode %d\n",
cmode);
break;
}
size /= PAGE_SIZE;
address &= PAGE_MASK;
while (size--)
{
pte_t *pte;
pte = my_find_pte(&init_mm, address);
if ( !pte )
{
printk("pte NULL in kernel_set_cachemode()\n");
return;
}
pte_val (*pte) &= mask;
pte_val (*pte) |= flags;
flush_tlb_page(find_vma(&init_mm,address),address);
address += PAGE_SIZE;
}
}
unsigned long mm_ptov (unsigned long paddr)
{
unsigned long ret;
if (paddr < 16*1024*1024)
ret = ZTWO_VADDR(paddr);
else {
int i;
for (i = 0; i < kmap_chunk_count;){
unsigned long phys = kmap_chunks[i++];
unsigned long size = kmap_chunks[i++];
unsigned long virt = kmap_chunks[i++];
if (paddr >= phys
&& paddr < (phys + size)){
ret = virt + paddr - phys;
goto exit;
}
}
ret = (unsigned long) __va(paddr);
}
exit:
#ifdef DEBUGPV
printk ("PTOV(%lx)=%lx\n", paddr, ret);
#endif
return ret;
}
int mm_end_of_chunk (unsigned long addr, int len)
{
if (memory[0].addr + memory[0].size == addr + len)
return 1;
return 0;
}
/*********************************************************** CACHE */
#define L1_CACHE_BYTES 32
#define MAX_CACHE_SIZE 8192
void cache_push(__u32 addr, int length)
{
addr = mm_ptov(addr);
if (MAX_CACHE_SIZE < length)
length = MAX_CACHE_SIZE;
while(length > 0){
__asm ("dcbf 0,%0\n\t"
: : "r" (addr));
addr += L1_CACHE_BYTES;
length -= L1_CACHE_BYTES;
}
/* Also flush trailing block */
__asm ("dcbf 0,%0\n\t"
"sync \n\t"
: : "r" (addr));
}
void cache_clear(__u32 addr, int length)
{
if (MAX_CACHE_SIZE < length)
length = MAX_CACHE_SIZE;
addr = mm_ptov(addr);
__asm ("dcbf 0,%0\n\t"
"sync \n\t"
"icbi 0,%0 \n\t"
"isync \n\t"
: : "r" (addr));
addr += L1_CACHE_BYTES;
length -= L1_CACHE_BYTES;
while(length > 0){
__asm ("dcbf 0,%0\n\t"
"sync \n\t"
"icbi 0,%0 \n\t"
"isync \n\t"
: : "r" (addr));
addr += L1_CACHE_BYTES;
length -= L1_CACHE_BYTES;
}
__asm ("dcbf 0,%0\n\t"
"sync \n\t"
"icbi 0,%0 \n\t"
"isync \n\t"
: : "r" (addr));
}
/****************************************************** from setup.c */
void
apus_restart(char *cmd)
{
local_irq_disable();
APUS_WRITE(APUS_REG_LOCK,
REGLOCK_BLACKMAGICK1|REGLOCK_BLACKMAGICK2);
APUS_WRITE(APUS_REG_LOCK,
REGLOCK_BLACKMAGICK1|REGLOCK_BLACKMAGICK3);
APUS_WRITE(APUS_REG_LOCK,
REGLOCK_BLACKMAGICK2|REGLOCK_BLACKMAGICK3);
APUS_WRITE(APUS_REG_SHADOW, REGSHADOW_SELFRESET);
APUS_WRITE(APUS_REG_RESET, REGRESET_AMIGARESET);
for(;;);
}
void
apus_power_off(void)
{
for (;;);
}
void
apus_halt(void)
{
apus_restart(NULL);
}
/****************************************************** IRQ stuff */
static unsigned char last_ipl[8];
int apus_get_irq(struct pt_regs* regs)
{
unsigned char ipl_emu, mask;
unsigned int level;
APUS_READ(APUS_IPL_EMU, ipl_emu);
level = (ipl_emu >> 3) & IPLEMU_IPLMASK;
mask = IPLEMU_SETRESET|IPLEMU_DISABLEINT|level;
level ^= 7;
/* Save previous IPL value */
if (last_ipl[level])
return -2;
last_ipl[level] = ipl_emu;
/* Set to current IPL value */
APUS_WRITE(APUS_IPL_EMU, mask);
APUS_WRITE(APUS_IPL_EMU, IPLEMU_DISABLEINT|level);
#ifdef __INTERRUPT_DEBUG
printk("<%d:%d>", level, ~ipl_emu & IPLEMU_IPLMASK);
#endif
return level + IRQ_AMIGA_AUTO;
}
void apus_end_irq(unsigned int irq)
{
unsigned char ipl_emu;
unsigned int level = irq - IRQ_AMIGA_AUTO;
#ifdef __INTERRUPT_DEBUG
printk("{%d}", ~last_ipl[level] & IPLEMU_IPLMASK);
#endif
/* Restore IPL to the previous value */
ipl_emu = last_ipl[level] & IPLEMU_IPLMASK;
APUS_WRITE(APUS_IPL_EMU, IPLEMU_SETRESET|IPLEMU_DISABLEINT|ipl_emu);
last_ipl[level] = 0;
ipl_emu ^= 7;
APUS_WRITE(APUS_IPL_EMU, IPLEMU_DISABLEINT|ipl_emu);
}
/****************************************************** debugging */
/* some serial hardware definitions */
#define SDR_OVRUN (1<<15)
#define SDR_RBF (1<<14)
#define SDR_TBE (1<<13)
#define SDR_TSRE (1<<12)
#define AC_SETCLR (1<<15)
#define AC_UARTBRK (1<<11)
#define SER_DTR (1<<7)
#define SER_RTS (1<<6)
#define SER_DCD (1<<5)
#define SER_CTS (1<<4)
#define SER_DSR (1<<3)
static __inline__ void ser_RTSon(void)
{
ciab.pra &= ~SER_RTS; /* active low */
}
int __debug_ser_out( unsigned char c )
{
amiga_custom.serdat = c | 0x100;
mb();
while (!(amiga_custom.serdatr & 0x2000))
barrier();
return 1;
}
unsigned char __debug_ser_in( void )
{
unsigned char c;
/* XXX: is that ok?? derived from amiga_ser.c... */
while( !(amiga_custom.intreqr & IF_RBF) )
barrier();
c = amiga_custom.serdatr;
/* clear the interrupt, so that another character can be read */
amiga_custom.intreq = IF_RBF;
return c;
}
int __debug_serinit( void )
{
unsigned long flags;
local_irq_save(flags);
/* turn off Rx and Tx interrupts */
amiga_custom.intena = IF_RBF | IF_TBE;
/* clear any pending interrupt */
amiga_custom.intreq = IF_RBF | IF_TBE;
local_irq_restore(flags);
/*
* set the appropriate directions for the modem control flags,
* and clear RTS and DTR
*/
ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
#ifdef CONFIG_KGDB
/* turn Rx interrupts on for GDB */
amiga_custom.intena = IF_SETCLR | IF_RBF;
ser_RTSon();
#endif
return 0;
}
void __debug_print_hex(unsigned long x)
{
int i;
char hexchars[] = "0123456789ABCDEF";
for (i = 0; i < 8; i++) {
__debug_ser_out(hexchars[(x >> 28) & 15]);
x <<= 4;
}
__debug_ser_out('\n');
__debug_ser_out('\r');
}
void __debug_print_string(char* s)
{
unsigned char c;
while((c = *s++))
__debug_ser_out(c);
__debug_ser_out('\n');
__debug_ser_out('\r');
}
static void apus_progress(char *s, unsigned short value)
{
__debug_print_string(s);
}
/****************************************************** init */
/* The number of spurious interrupts */
volatile unsigned int num_spurious;
extern struct irqaction amiga_sys_irqaction[AUTO_IRQS];
extern void amiga_enable_irq(unsigned int irq);
extern void amiga_disable_irq(unsigned int irq);
struct hw_interrupt_type amiga_sys_irqctrl = {
.typename = "Amiga IPL",
.end = apus_end_irq,
};
struct hw_interrupt_type amiga_irqctrl = {
.typename = "Amiga ",
.enable = amiga_enable_irq,
.disable = amiga_disable_irq,
};
#define HARDWARE_MAPPED_SIZE (512*1024)
unsigned long __init apus_find_end_of_memory(void)
{
int shadow = 0;
unsigned long total;
/* The memory size reported by ADOS excludes the 512KB
reserved for PPC exception registers and possibly 512KB
containing a shadow of the ADOS ROM. */
{
unsigned long size = memory[0].size;
/* If 2MB aligned, size was probably user
specified. We can't tell anything about shadowing
in this case so skip shadow assignment. */
if (0 != (size & 0x1fffff)){
/* Align to 512KB to ensure correct handling
of both memfile and system specified
sizes. */
size = ((size+0x0007ffff) & 0xfff80000);
/* If memory is 1MB aligned, assume
shadowing. */
shadow = !(size & 0x80000);
}
/* Add the chunk that ADOS does not see. by aligning
the size to the nearest 2MB limit upwards. */
memory[0].size = ((size+0x001fffff) & 0xffe00000);
}
ppc_memstart = memory[0].addr;
ppc_memoffset = PAGE_OFFSET - PPC_MEMSTART;
total = memory[0].size;
/* Remove the memory chunks that are controlled by special
Phase5 hardware. */
/* Remove the upper 512KB if it contains a shadow of
the ADOS ROM. FIXME: It might be possible to
disable this shadow HW. Check the booter
(ppc_boot.c) */
if (shadow)
total -= HARDWARE_MAPPED_SIZE;
/* Remove the upper 512KB where the PPC exception
vectors are mapped. */
total -= HARDWARE_MAPPED_SIZE;
/* Linux/APUS only handles one block of memory -- the one on
the PowerUP board. Other system memory is horrible slow in
comparison. The user can use other memory for swapping
using the z2ram device. */
return total;
}
static void __init
apus_map_io(void)
{
/* Map PPC exception vectors. */
io_block_mapping(0xfff00000, 0xfff00000, 0x00020000, _PAGE_KERNEL);
/* Map chip and ZorroII memory */
io_block_mapping(zTwoBase, 0x00000000, 0x01000000, _PAGE_IO);
}
__init
void apus_init_IRQ(void)
{
struct irqaction *action;
int i;
#ifdef CONFIG_PCI
apus_setup_pci_ptrs();
#endif
for ( i = 0 ; i < AMI_IRQS; i++ ) {
irq_desc[i].status = IRQ_LEVEL;
if (i < IRQ_AMIGA_AUTO) {
irq_desc[i].chip = &amiga_irqctrl;
} else {
irq_desc[i].chip = &amiga_sys_irqctrl;
action = &amiga_sys_irqaction[i-IRQ_AMIGA_AUTO];
if (action->name)
setup_irq(i, action);
}
}
amiga_init_IRQ();
}
__init
void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7)
{
extern int parse_bootinfo(const struct bi_record *);
extern char _end[];
/* Parse bootinfo. The bootinfo is located right after
the kernel bss */
parse_bootinfo((const struct bi_record *)&_end);
#ifdef CONFIG_BLK_DEV_INITRD
/* Take care of initrd if we have one. Use data from
bootinfo to avoid the need to initialize PPC
registers when kernel is booted via a PPC reset. */
if ( ramdisk.addr ) {
initrd_start = (unsigned long) __va(ramdisk.addr);
initrd_end = (unsigned long)
__va(ramdisk.size + ramdisk.addr);
}
#endif /* CONFIG_BLK_DEV_INITRD */
ISA_DMA_THRESHOLD = 0x00ffffff;
ppc_md.setup_arch = apus_setup_arch;
ppc_md.show_cpuinfo = apus_show_cpuinfo;
ppc_md.init_IRQ = apus_init_IRQ;
ppc_md.get_irq = apus_get_irq;
#ifdef CONFIG_HEARTBEAT
ppc_md.heartbeat = apus_heartbeat;
ppc_md.heartbeat_count = 1;
#endif
#ifdef APUS_DEBUG
__debug_serinit();
ppc_md.progress = apus_progress;
#endif
ppc_md.init = NULL;
ppc_md.restart = apus_restart;
ppc_md.power_off = apus_power_off;
ppc_md.halt = apus_halt;
ppc_md.time_init = NULL;
ppc_md.set_rtc_time = apus_set_rtc_time;
ppc_md.get_rtc_time = apus_get_rtc_time;
ppc_md.calibrate_decr = apus_calibrate_decr;
ppc_md.find_end_of_memory = apus_find_end_of_memory;
ppc_md.setup_io_mappings = apus_map_io;
}
