/*
 *  linux/arch/m68k/amiga/config.c
 *
 *  Copyright (C) 1993 Hamish Macdonald
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

/*
 * Miscellaneous Amiga stuff
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/clocksource.h>
#include <linux/console.h>
#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/zorro.h>
#include <linux/module.h>
#include <linux/keyboard.h>

#include <asm/bootinfo.h>
#include <asm/bootinfo-amiga.h>
#include <asm/byteorder.h>
#include <asm/setup.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/irq.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/config.h>

#include "amiga.h"

static unsigned long amiga_model;

unsigned long amiga_eclock;
EXPORT_SYMBOL(amiga_eclock);

unsigned long amiga_colorclock;
EXPORT_SYMBOL(amiga_colorclock);

unsigned long amiga_chipset;
EXPORT_SYMBOL(amiga_chipset);

unsigned char amiga_vblank;
EXPORT_SYMBOL(amiga_vblank);

static unsigned char amiga_psfreq;

struct amiga_hw_present amiga_hw_present;
EXPORT_SYMBOL(amiga_hw_present);

static char s_a500[] __initdata = "A500";
static char s_a500p[] __initdata = "A500+";
static char s_a600[] __initdata = "A600";
static char s_a1000[] __initdata = "A1000";
static char s_a1200[] __initdata = "A1200";
static char s_a2000[] __initdata = "A2000";
static char s_a2500[] __initdata = "A2500";
static char s_a3000[] __initdata = "A3000";
static char s_a3000t[] __initdata = "A3000T";
static char s_a3000p[] __initdata = "A3000+";
static char s_a4000[] __initdata = "A4000";
static char s_a4000t[] __initdata = "A4000T";
static char s_cdtv[] __initdata = "CDTV";
static char s_cd32[] __initdata = "CD32";
static char s_draco[] __initdata = "Draco";
static char *amiga_models[] __initdata = {
        [AMI_500-AMI_500]       = s_a500,
        [AMI_500PLUS-AMI_500]   = s_a500p,
        [AMI_600-AMI_500]       = s_a600,
        [AMI_1000-AMI_500]      = s_a1000,
        [AMI_1200-AMI_500]      = s_a1200,
        [AMI_2000-AMI_500]      = s_a2000,
        [AMI_2500-AMI_500]      = s_a2500,
        [AMI_3000-AMI_500]      = s_a3000,
        [AMI_3000T-AMI_500]     = s_a3000t,
        [AMI_3000PLUS-AMI_500]  = s_a3000p,
        [AMI_4000-AMI_500]      = s_a4000,
        [AMI_4000T-AMI_500]     = s_a4000t,
        [AMI_CDTV-AMI_500]      = s_cdtv,
        [AMI_CD32-AMI_500]      = s_cd32,
        [AMI_DRACO-AMI_500]     = s_draco,
};

static char amiga_model_name[13] = "Amiga ";

static void amiga_sched_init(void);
static void amiga_get_model(char *model);
static void amiga_get_hardware_list(struct seq_file *m);
static void amiga_reset(void);
static void amiga_mem_console_write(struct console *co, const char *b,
                                    unsigned int count);
#ifdef CONFIG_HEARTBEAT
static void amiga_heartbeat(int on);
#endif

static struct console amiga_console_driver = {
        .name   = "debug",
        .flags  = CON_PRINTBUFFER,
        .index  = -1,
};


    /*
     *  Motherboard Resources present in all Amiga models
     */

static struct {
        struct resource _ciab, _ciaa, _custom, _kickstart;
} mb_resources = {
        ._ciab = {
                .name = "CIA B", .start = 0x00bfd000, .end = 0x00bfdfff
        },
        ._ciaa = {
                .name = "CIA A", .start = 0x00bfe000, .end = 0x00bfefff
        },
        ._custom = {
                .name = "Custom I/O", .start = 0x00dff000, .end = 0x00dfffff
        },
        ._kickstart = {
                .name = "Kickstart ROM", .start = 0x00f80000, .end = 0x00ffffff
        }
};

static struct resource ram_resource[NUM_MEMINFO];


    /*
     *  Parse an Amiga-specific record in the bootinfo
     */

int __init amiga_parse_bootinfo(const struct bi_record *record)
{
        int unknown = 0;
        const void *data = record->data;

        switch (be16_to_cpu(record->tag)) {
        case BI_AMIGA_MODEL:
                amiga_model = be32_to_cpup(data);
                break;

        case BI_AMIGA_ECLOCK:
                amiga_eclock = be32_to_cpup(data);
                break;

        case BI_AMIGA_CHIPSET:
                amiga_chipset = be32_to_cpup(data);
                break;

        case BI_AMIGA_CHIP_SIZE:
                amiga_chip_size = be32_to_cpup(data);
                break;

        case BI_AMIGA_VBLANK:
                amiga_vblank = *(const __u8 *)data;
                break;

        case BI_AMIGA_PSFREQ:
                amiga_psfreq = *(const __u8 *)data;
                break;

        case BI_AMIGA_AUTOCON:
#ifdef CONFIG_ZORRO
                if (zorro_num_autocon < ZORRO_NUM_AUTO) {
                        const struct ConfigDev *cd = data;
                        struct zorro_dev_init *dev = &zorro_autocon_init[zorro_num_autocon++];
                        dev->rom = cd->cd_Rom;
                        dev->slotaddr = be16_to_cpu(cd->cd_SlotAddr);
                        dev->slotsize = be16_to_cpu(cd->cd_SlotSize);
                        dev->boardaddr = be32_to_cpu(cd->cd_BoardAddr);
                        dev->boardsize = be32_to_cpu(cd->cd_BoardSize);

                        /* CS-LAB Warp 1260 workaround */
                        if (be16_to_cpu(dev->rom.er_Manufacturer) == ZORRO_MANUF(ZORRO_PROD_CSLAB_WARP_1260) &&
                            dev->rom.er_Product == ZORRO_PROD(ZORRO_PROD_CSLAB_WARP_1260)) {

                                /* turn off all interrupts */
                                pr_info("Warp 1260 card detected: applying interrupt storm workaround\n");
                                *(uint32_t *)(dev->boardaddr + 0x1000) = 0xfff;
                        }
                } else
                        pr_warn("amiga_parse_bootinfo: too many AutoConfig devices\n");
#endif /* CONFIG_ZORRO */
                break;

        case BI_AMIGA_SERPER:
                /* serial port period: ignored here */
                break;

        default:
                unknown = 1;
        }
        return unknown;
}

    /*
     *  Identify builtin hardware
     */

static void __init amiga_identify(void)
{
        /* Fill in some default values, if necessary */
        if (amiga_eclock == 0)
                amiga_eclock = 709379;

        memset(&amiga_hw_present, 0, sizeof(amiga_hw_present));

        pr_info("Amiga hardware found: ");
        if (amiga_model >= AMI_500 && amiga_model <= AMI_DRACO) {
                pr_cont("[%s] ", amiga_models[amiga_model-AMI_500]);
                strcat(amiga_model_name, amiga_models[amiga_model-AMI_500]);
        }

        switch (amiga_model) {
        case AMI_UNKNOWN:
                break;

        case AMI_600:
        case AMI_1200:
                AMIGAHW_SET(A1200_IDE);
                AMIGAHW_SET(PCMCIA);
                fallthrough;
        case AMI_500:
        case AMI_500PLUS:
        case AMI_1000:
        case AMI_2000:
        case AMI_2500:
                AMIGAHW_SET(A2000_CLK); /* Is this correct for all models? */
                break;

        case AMI_3000:
        case AMI_3000T:
                AMIGAHW_SET(AMBER_FF);
                AMIGAHW_SET(MAGIC_REKICK);
                fallthrough;
        case AMI_3000PLUS:
                AMIGAHW_SET(A3000_SCSI);
                AMIGAHW_SET(A3000_CLK);
                AMIGAHW_SET(ZORRO3);
                break;

        case AMI_4000T:
                AMIGAHW_SET(A4000_SCSI);
                fallthrough;
        case AMI_4000:
                AMIGAHW_SET(A4000_IDE);
                AMIGAHW_SET(A3000_CLK);
                AMIGAHW_SET(ZORRO3);
                break;

        case AMI_CDTV:
        case AMI_CD32:
                AMIGAHW_SET(CD_ROM);
                AMIGAHW_SET(A2000_CLK);             /* Is this correct? */
                break;

        case AMI_DRACO:
                panic("No support for Draco yet");

        default:
                panic("Unknown Amiga Model");
        }

        AMIGAHW_SET(AMI_VIDEO);
        AMIGAHW_SET(AMI_BLITTER);
        AMIGAHW_SET(AMI_AUDIO);
        AMIGAHW_SET(AMI_FLOPPY);
        AMIGAHW_SET(AMI_KEYBOARD);
        AMIGAHW_SET(AMI_MOUSE);
        AMIGAHW_SET(AMI_SERIAL);
        AMIGAHW_SET(AMI_PARALLEL);
        AMIGAHW_SET(CHIP_RAM);
        AMIGAHW_SET(PAULA);

        switch (amiga_chipset) {
        case CS_OCS:
        case CS_ECS:
        case CS_AGA:
                switch (amiga_custom.deniseid & 0xf) {
                case 0x0c:
                        AMIGAHW_SET(DENISE_HR);
                        break;
                case 0x08:
                        AMIGAHW_SET(LISA);
                        break;
                default:
                        AMIGAHW_SET(DENISE);
                        break;
                }
                break;
        }
        switch ((amiga_custom.vposr>>8) & 0x7f) {
        case 0x00:
                AMIGAHW_SET(AGNUS_PAL);
                break;
        case 0x10:
                AMIGAHW_SET(AGNUS_NTSC);
                break;
        case 0x20:
        case 0x21:
                AMIGAHW_SET(AGNUS_HR_PAL);
                break;
        case 0x30:
        case 0x31:
                AMIGAHW_SET(AGNUS_HR_NTSC);
                break;
        case 0x22:
        case 0x23:
                AMIGAHW_SET(ALICE_PAL);
                break;
        case 0x32:
        case 0x33:
                AMIGAHW_SET(ALICE_NTSC);
                break;
        }
        AMIGAHW_SET(ZORRO);

#define AMIGAHW_ANNOUNCE(name, str)             \
        if (AMIGAHW_PRESENT(name))              \
                pr_cont(str)

        AMIGAHW_ANNOUNCE(AMI_VIDEO, "VIDEO ");
        AMIGAHW_ANNOUNCE(AMI_BLITTER, "BLITTER ");
        AMIGAHW_ANNOUNCE(AMBER_FF, "AMBER_FF ");
        AMIGAHW_ANNOUNCE(AMI_AUDIO, "AUDIO ");
        AMIGAHW_ANNOUNCE(AMI_FLOPPY, "FLOPPY ");
        AMIGAHW_ANNOUNCE(A3000_SCSI, "A3000_SCSI ");
        AMIGAHW_ANNOUNCE(A4000_SCSI, "A4000_SCSI ");
        AMIGAHW_ANNOUNCE(A1200_IDE, "A1200_IDE ");
        AMIGAHW_ANNOUNCE(A4000_IDE, "A4000_IDE ");
        AMIGAHW_ANNOUNCE(CD_ROM, "CD_ROM ");
        AMIGAHW_ANNOUNCE(AMI_KEYBOARD, "KEYBOARD ");
        AMIGAHW_ANNOUNCE(AMI_MOUSE, "MOUSE ");
        AMIGAHW_ANNOUNCE(AMI_SERIAL, "SERIAL ");
        AMIGAHW_ANNOUNCE(AMI_PARALLEL, "PARALLEL ");
        AMIGAHW_ANNOUNCE(A2000_CLK, "A2000_CLK ");
        AMIGAHW_ANNOUNCE(A3000_CLK, "A3000_CLK ");
        AMIGAHW_ANNOUNCE(CHIP_RAM, "CHIP_RAM ");
        AMIGAHW_ANNOUNCE(PAULA, "PAULA ");
        AMIGAHW_ANNOUNCE(DENISE, "DENISE ");
        AMIGAHW_ANNOUNCE(DENISE_HR, "DENISE_HR ");
        AMIGAHW_ANNOUNCE(LISA, "LISA ");
        AMIGAHW_ANNOUNCE(AGNUS_PAL, "AGNUS_PAL ");
        AMIGAHW_ANNOUNCE(AGNUS_NTSC, "AGNUS_NTSC ");
        AMIGAHW_ANNOUNCE(AGNUS_HR_PAL, "AGNUS_HR_PAL ");
        AMIGAHW_ANNOUNCE(AGNUS_HR_NTSC, "AGNUS_HR_NTSC ");
        AMIGAHW_ANNOUNCE(ALICE_PAL, "ALICE_PAL ");
        AMIGAHW_ANNOUNCE(ALICE_NTSC, "ALICE_NTSC ");
        AMIGAHW_ANNOUNCE(MAGIC_REKICK, "MAGIC_REKICK ");
        AMIGAHW_ANNOUNCE(PCMCIA, "PCMCIA ");
        if (AMIGAHW_PRESENT(ZORRO))
                pr_cont("ZORRO%s ", AMIGAHW_PRESENT(ZORRO3) ? "3" : "");
        pr_cont("\n");

#undef AMIGAHW_ANNOUNCE
}


static unsigned long amiga_random_get_entropy(void)
{
        /* VPOSR/VHPOSR provide at least 17 bits of data changing at 1.79 MHz */
        return *(unsigned long *)&amiga_custom.vposr;
}


    /*
     *  Setup the Amiga configuration info
     */

void __init config_amiga(void)
{
        int i;

        amiga_identify();

        /* Yuk, we don't have PCI memory */
        iomem_resource.name = "Memory";
        for (i = 0; i < 4; i++)
                request_resource(&iomem_resource, &((struct resource *)&mb_resources)[i]);

        mach_sched_init      = amiga_sched_init;
        mach_init_IRQ        = amiga_init_IRQ;
        mach_get_model       = amiga_get_model;
        mach_get_hardware_list = amiga_get_hardware_list;
        mach_reset           = amiga_reset;
#if IS_ENABLED(CONFIG_INPUT_M68K_BEEP)
        mach_beep            = amiga_mksound;
#endif

#ifdef CONFIG_HEARTBEAT
        mach_heartbeat = amiga_heartbeat;
#endif

        mach_random_get_entropy = amiga_random_get_entropy;

        /* Fill in the clock value (based on the 700 kHz E-Clock) */
        amiga_colorclock = 5*amiga_eclock;      /* 3.5 MHz */

        /* clear all DMA bits */
        amiga_custom.dmacon = DMAF_ALL;
        /* ensure that the DMA master bit is set */
        amiga_custom.dmacon = DMAF_SETCLR | DMAF_MASTER;

        /* don't use Z2 RAM as system memory on Z3 capable machines */
        if (AMIGAHW_PRESENT(ZORRO3)) {
                int i, j;
                u32 disabled_z2mem = 0;

                for (i = 0; i < m68k_num_memory; i++) {
                        if (m68k_memory[i].addr < 16*1024*1024) {
                                if (i == 0) {
                                        /* don't cut off the branch we're sitting on */
                                        pr_warn("Warning: kernel runs in Zorro II memory\n");
                                        continue;
                                }
                                disabled_z2mem += m68k_memory[i].size;
                                m68k_num_memory--;
                                for (j = i; j < m68k_num_memory; j++)
                                        m68k_memory[j] = m68k_memory[j+1];
                                i--;
                        }
                }
                if (disabled_z2mem)
                        pr_info("%dK of Zorro II memory will not be used as system memory\n",
                                disabled_z2mem>>10);
        }

        /* request all RAM */
        for (i = 0; i < m68k_num_memory; i++) {
                ram_resource[i].name =
                        (m68k_memory[i].addr >= 0x01000000) ? "32-bit Fast RAM" :
                        (m68k_memory[i].addr < 0x00c00000) ? "16-bit Fast RAM" :
                        "16-bit Slow RAM";
                ram_resource[i].start = m68k_memory[i].addr;
                ram_resource[i].end = m68k_memory[i].addr+m68k_memory[i].size-1;
                request_resource(&iomem_resource, &ram_resource[i]);
        }

        /* initialize chipram allocator */
        amiga_chip_init();

        /* our beloved beeper */
        if (AMIGAHW_PRESENT(AMI_AUDIO))
                amiga_init_sound();

        /*
         * if it is an A3000, set the magic bit that forces
         * a hard rekick
         */
        if (AMIGAHW_PRESENT(MAGIC_REKICK))
                *(unsigned char *)ZTWO_VADDR(0xde0002) |= 0x80;
}

static u64 amiga_read_clk(struct clocksource *cs);

static struct clocksource amiga_clk = {
        .name   = "ciab",
        .rating = 250,
        .read   = amiga_read_clk,
        .mask   = CLOCKSOURCE_MASK(32),
        .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
};

static unsigned short jiffy_ticks;
static u32 clk_total, clk_offset;

static irqreturn_t ciab_timer_handler(int irq, void *dev_id)
{
        clk_total += jiffy_ticks;
        clk_offset = 0;
        legacy_timer_tick(1);
        timer_heartbeat();

        return IRQ_HANDLED;
}

static void __init amiga_sched_init(void)
{
        static struct resource sched_res = {
                .name = "timer", .start = 0x00bfd400, .end = 0x00bfd5ff,
        };
        jiffy_ticks = DIV_ROUND_CLOSEST(amiga_eclock, HZ);

        if (request_resource(&mb_resources._ciab, &sched_res))
                pr_warn("Cannot allocate ciab.ta{lo,hi}\n");
        ciab.cra &= 0xC0;   /* turn off timer A, continuous mode, from Eclk */
        ciab.talo = jiffy_ticks % 256;
        ciab.tahi = jiffy_ticks / 256;

        /* install interrupt service routine for CIAB Timer A
         *
         * Please don't change this to use ciaa, as it interferes with the
         * SCSI code. We'll have to take a look at this later
         */
        if (request_irq(IRQ_AMIGA_CIAB_TA, ciab_timer_handler, IRQF_TIMER,
                        "timer", NULL))
                pr_err("Couldn't register timer interrupt\n");
        /* start timer */
        ciab.cra |= 0x11;

        clocksource_register_hz(&amiga_clk, amiga_eclock);
}

static u64 amiga_read_clk(struct clocksource *cs)
{
        unsigned short hi, lo, hi2;
        unsigned long flags;
        u32 ticks;

        local_irq_save(flags);

        /* read CIA B timer A current value */
        hi  = ciab.tahi;
        lo  = ciab.talo;
        hi2 = ciab.tahi;

        if (hi != hi2) {
                lo = ciab.talo;
                hi = hi2;
        }

        ticks = hi << 8 | lo;

        if (ticks > jiffy_ticks / 2)
                /* check for pending interrupt */
                if (cia_set_irq(&ciab_base, 0) & CIA_ICR_TA)
                        clk_offset = jiffy_ticks;

        ticks = jiffy_ticks - ticks;
        ticks += clk_offset + clk_total;

        local_irq_restore(flags);

        return ticks;
}

static void amiga_reset(void)  __noreturn;

static void amiga_reset(void)
{
        unsigned long jmp_addr040 = virt_to_phys(&&jmp_addr_label040);
        unsigned long jmp_addr = virt_to_phys(&&jmp_addr_label);

        local_irq_disable();
        if (CPU_IS_040_OR_060)
                /* Setup transparent translation registers for mapping
                 * of 16 MB kernel segment before disabling translation
                 */
                asm volatile ("\n"
                        "       move.l  %0,%%d0\n"
                        "       and.l   #0xff000000,%%d0\n"
                        "       or.w    #0xe020,%%d0\n"   /* map 16 MB, enable, cacheable */
                        "       .chip   68040\n"
                        "       movec   %%d0,%%itt0\n"
                        "       movec   %%d0,%%dtt0\n"
                        "       .chip   68k\n"
                        "       jmp     %0@\n"
                        : /* no outputs */
                        : "a" (jmp_addr040)
                        : "d0");
        else
                /* for 680[23]0, just disable translation and jump to the physical
                 * address of the label
                 */
                asm volatile ("\n"
                        "       pmove   %%tc,%@\n"
                        "       bclr    #7,%@\n"
                        "       pmove   %@,%%tc\n"
                        "       jmp     %0@\n"
                        : /* no outputs */
                        : "a" (jmp_addr));
jmp_addr_label040:
        /* disable translation on '040 now */
        asm volatile ("\n"
                "       moveq   #0,%%d0\n"
                "       .chip   68040\n"
                "       movec   %%d0,%%tc\n"    /* disable MMU */
                "       .chip   68k\n"
                : /* no outputs */
                : /* no inputs */
                : "d0");

        jmp_addr_label:
        /* pickup reset address from AmigaOS ROM, reset devices and jump
         * to reset address
         */
        asm volatile ("\n"
                "       move.w  #0x2700,%sr\n"
                "       lea     0x01000000,%a0\n"
                "       sub.l   %a0@(-0x14),%a0\n"
                "       move.l  %a0@(4),%a0\n"
                "       subq.l  #2,%a0\n"
                "       jra     1f\n"
                /* align on a longword boundary */
                "       " __ALIGN_STR "\n"
                "1:\n"
                "       reset\n"
                "       jmp   %a0@");

        for (;;)
                ;
}


    /*
     *  Debugging
     */

#define SAVEKMSG_MAXMEM         128*1024

#define SAVEKMSG_MAGIC1         0x53415645      /* 'SAVE' */
#define SAVEKMSG_MAGIC2         0x4B4D5347      /* 'KMSG' */

struct savekmsg {
        unsigned long magic1;           /* SAVEKMSG_MAGIC1 */
        unsigned long magic2;           /* SAVEKMSG_MAGIC2 */
        unsigned long magicptr;         /* address of magic1 */
        unsigned long size;
        char data[];
};

static struct savekmsg *savekmsg;

static void amiga_mem_console_write(struct console *co, const char *s,
                                    unsigned int count)
{
        if (savekmsg->size + count <= SAVEKMSG_MAXMEM-sizeof(struct savekmsg)) {
                memcpy(savekmsg->data + savekmsg->size, s, count);
                savekmsg->size += count;
        }
}

static int __init amiga_savekmsg_setup(char *arg)
{
        bool registered;

        if (!MACH_IS_AMIGA || strcmp(arg, "mem"))
                return 0;

        if (amiga_chip_size < SAVEKMSG_MAXMEM) {
                pr_err("Not enough chipram for debugging\n");
                return -ENOMEM;
        }

        /* Just steal the block, the chipram allocator isn't functional yet */
        amiga_chip_size -= SAVEKMSG_MAXMEM;
        savekmsg = ZTWO_VADDR(CHIP_PHYSADDR + amiga_chip_size);
        savekmsg->magic1 = SAVEKMSG_MAGIC1;
        savekmsg->magic2 = SAVEKMSG_MAGIC2;
        savekmsg->magicptr = ZTWO_PADDR(savekmsg);
        savekmsg->size = 0;

        registered = !!amiga_console_driver.write;
        amiga_console_driver.write = amiga_mem_console_write;
        if (!registered)
                register_console(&amiga_console_driver);
        return 0;
}

early_param("debug", amiga_savekmsg_setup);

static void amiga_serial_putc(char c)
{
        amiga_custom.serdat = (unsigned char)c | 0x100;
        while (!(amiga_custom.serdatr & 0x2000))
                ;
}

static void amiga_serial_console_write(struct console *co, const char *s,
                                       unsigned int count)
{
        while (count--) {
                if (*s == '\n')
                        amiga_serial_putc('\r');
                amiga_serial_putc(*s++);
        }
}

#if 0
void amiga_serial_puts(const char *s)
{
        amiga_serial_console_write(NULL, s, strlen(s));
}

int amiga_serial_console_wait_key(struct console *co)
{
        int ch;

        while (!(amiga_custom.intreqr & IF_RBF))
                barrier();
        ch = amiga_custom.serdatr & 0xff;
        /* clear the interrupt, so that another character can be read */
        amiga_custom.intreq = IF_RBF;
        return ch;
}

void amiga_serial_gets(struct console *co, char *s, int len)
{
        int ch, cnt = 0;

        while (1) {
                ch = amiga_serial_console_wait_key(co);

                /* Check for backspace. */
                if (ch == 8 || ch == 127) {
                        if (cnt == 0) {
                                amiga_serial_putc('\007');
                                continue;
                        }
                        cnt--;
                        amiga_serial_puts("\010 \010");
                        continue;
                }

                /* Check for enter. */
                if (ch == 10 || ch == 13)
                        break;

                /* See if line is too long. */
                if (cnt >= len + 1) {
                        amiga_serial_putc(7);
                        cnt--;
                        continue;
                }

                /* Store and echo character. */
                s[cnt++] = ch;
                amiga_serial_putc(ch);
        }
        /* Print enter. */
        amiga_serial_puts("\r\n");
        s[cnt] = 0;
}
#endif

static int __init amiga_debug_setup(char *arg)
{
        bool registered;

        if (!MACH_IS_AMIGA || strcmp(arg, "ser"))
                return 0;

        /* no initialization required (?) */
        registered = !!amiga_console_driver.write;
        amiga_console_driver.write = amiga_serial_console_write;
        if (!registered)
                register_console(&amiga_console_driver);
        return 0;
}

early_param("debug", amiga_debug_setup);

#ifdef CONFIG_HEARTBEAT
static void amiga_heartbeat(int on)
{
        if (on)
                ciaa.pra &= ~2;
        else
                ciaa.pra |= 2;
}
#endif

    /*
     *  Amiga specific parts of /proc
     */

static void amiga_get_model(char *model)
{
        strcpy(model, amiga_model_name);
}


static void amiga_get_hardware_list(struct seq_file *m)
{
        if (AMIGAHW_PRESENT(CHIP_RAM))
                seq_printf(m, "Chip RAM:\t%ldK\n", amiga_chip_size>>10);
        seq_printf(m, "PS Freq:\t%dHz\nEClock Freq:\t%ldHz\n",
                        amiga_psfreq, amiga_eclock);
        if (AMIGAHW_PRESENT(AMI_VIDEO)) {
                char *type;
                switch (amiga_chipset) {
                case CS_OCS:
                        type = "OCS";
                        break;
                case CS_ECS:
                        type = "ECS";
                        break;
                case CS_AGA:
                        type = "AGA";
                        break;
                default:
                        type = "Old or Unknown";
                        break;
                }
                seq_printf(m, "Graphics:\t%s\n", type);
        }

#define AMIGAHW_ANNOUNCE(name, str)                     \
        if (AMIGAHW_PRESENT(name))                      \
                seq_printf (m, "\t%s\n", str)

        seq_puts(m, "Detected hardware:\n");
        AMIGAHW_ANNOUNCE(AMI_VIDEO, "Amiga Video");
        AMIGAHW_ANNOUNCE(AMI_BLITTER, "Blitter");
        AMIGAHW_ANNOUNCE(AMBER_FF, "Amber Flicker Fixer");
        AMIGAHW_ANNOUNCE(AMI_AUDIO, "Amiga Audio");
        AMIGAHW_ANNOUNCE(AMI_FLOPPY, "Floppy Controller");
        AMIGAHW_ANNOUNCE(A3000_SCSI, "SCSI Controller WD33C93 (A3000 style)");
        AMIGAHW_ANNOUNCE(A4000_SCSI, "SCSI Controller NCR53C710 (A4000T style)");
        AMIGAHW_ANNOUNCE(A1200_IDE, "IDE Interface (A1200 style)");
        AMIGAHW_ANNOUNCE(A4000_IDE, "IDE Interface (A4000 style)");
        AMIGAHW_ANNOUNCE(CD_ROM, "Internal CD ROM drive");
        AMIGAHW_ANNOUNCE(AMI_KEYBOARD, "Keyboard");
        AMIGAHW_ANNOUNCE(AMI_MOUSE, "Mouse Port");
        AMIGAHW_ANNOUNCE(AMI_SERIAL, "Serial Port");
        AMIGAHW_ANNOUNCE(AMI_PARALLEL, "Parallel Port");
        AMIGAHW_ANNOUNCE(A2000_CLK, "Hardware Clock (A2000 style)");
        AMIGAHW_ANNOUNCE(A3000_CLK, "Hardware Clock (A3000 style)");
        AMIGAHW_ANNOUNCE(CHIP_RAM, "Chip RAM");
        AMIGAHW_ANNOUNCE(PAULA, "Paula 8364");
        AMIGAHW_ANNOUNCE(DENISE, "Denise 8362");
        AMIGAHW_ANNOUNCE(DENISE_HR, "Denise 8373");
        AMIGAHW_ANNOUNCE(LISA, "Lisa 8375");
        AMIGAHW_ANNOUNCE(AGNUS_PAL, "Normal/Fat PAL Agnus 8367/8371");
        AMIGAHW_ANNOUNCE(AGNUS_NTSC, "Normal/Fat NTSC Agnus 8361/8370");
        AMIGAHW_ANNOUNCE(AGNUS_HR_PAL, "Fat Hires PAL Agnus 8372");
        AMIGAHW_ANNOUNCE(AGNUS_HR_NTSC, "Fat Hires NTSC Agnus 8372");
        AMIGAHW_ANNOUNCE(ALICE_PAL, "PAL Alice 8374");
        AMIGAHW_ANNOUNCE(ALICE_NTSC, "NTSC Alice 8374");
        AMIGAHW_ANNOUNCE(MAGIC_REKICK, "Magic Hard Rekick");
        AMIGAHW_ANNOUNCE(PCMCIA, "PCMCIA Slot");
#ifdef CONFIG_ZORRO
        if (AMIGAHW_PRESENT(ZORRO))
                seq_printf(m, "\tZorro II%s AutoConfig: %d Expansion "
                                "Device%s\n",
                                AMIGAHW_PRESENT(ZORRO3) ? "I" : "",
                                zorro_num_autocon, str_plural(zorro_num_autocon));
#endif /* CONFIG_ZORRO */

#undef AMIGAHW_ANNOUNCE
}

/*
 * The Amiga keyboard driver needs key_maps, but we cannot export it in
 * drivers/char/defkeymap.c, as it is autogenerated
 */
#ifdef CONFIG_VT
EXPORT_SYMBOL_GPL(key_maps);
#endif