1 files changed, 815 insertions, 0 deletions

diff --git a/arch/ppc/platforms/apus_setup.c b/arch/ppc/platforms/apus_setup.c
new file mode 100644
index 000000000000..2f74fde98ebc
--- /dev/null
+++ b/arch/ppc/platforms/apus_setup.c
@@ -0,0 +1,815 @@
+/*
+ *  arch/ppc/platforms/apus_setup.c
+ *
+ *  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/config.h>
+#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 */
+#if defined(CONFIG_AMIGA_FLOPPY)
+void (*mach_floppy_setup) (char *, int *) __initdata = NULL;
+#endif
+#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 amiga_floppy_setup(char *, int *);
+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)
+{
+}
+
+/*********************************************************** FLOPPY */
+#if defined(CONFIG_AMIGA_FLOPPY)
+__init
+void floppy_setup(char *str, int *ints)
+{
+        if (mach_floppy_setup)
+                mach_floppy_setup (str, ints);
+}
+#endif
+
+/*********************************************************** 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 )
+{
+        custom.serdat = c | 0x100;
+        mb();
+        while (!(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( !(custom.intreqr & IF_RBF) )
+                barrier();
+        c = custom.serdatr;
+        /* clear the interrupt, so that another character can be read */
+        custom.intreq = IF_RBF;
+        return c;
+}
+
+int __debug_serinit( void )
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+
+        /* turn off Rx and Tx interrupts */
+        custom.intena = IF_RBF | IF_TBE;
+
+        /* clear any pending interrupt */
+        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 */
+        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].handler = &amiga_irqctrl;
+                } else {
+                        irq_desc[i].handler = &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;
+}