/*
 *   OpenBIOS SBus driver
 *
 *   (C) 2004 Stefan Reinauer <stepan@openbios.org>
 *   (C) 2005 Ed Schouten <ed@fxq.nl>
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   version 2
 *
 */

#include "config.h"
#include "libopenbios/bindings.h"
#include "kernel/kernel.h"
#include "libc/byteorder.h"
#include "libc/vsprintf.h"
#include "drivers/drivers.h"
#include "libopenbios/ofmem.h"
#include "libopenbios/video.h"

#define SBUS_REGS        0x28
#define SBUS_SLOTS       16
#define APC_REGS         0x10
#define APC_OFFSET       0x0a000000ULL
#define CS4231_REGS      0x40
#define CS4231_OFFSET    0x0c000000ULL
#define MACIO_ESPDMA     0x00400000ULL /* ESP DMA controller */
#define MACIO_ESP        0x00800000ULL /* ESP SCSI */
#define SS600MP_ESPDMA   0x00081000ULL
#define SS600MP_ESP      0x00080000ULL
#define SS600MP_LEBUFFER (SS600MP_ESPDMA + 0x10) // XXX should be 0x40000
#define LEDMA_REGS       0x4
#define LE_REGS          0x20

#ifdef CONFIG_DEBUG_SBUS
#define DPRINTF(fmt, args...)                   \
    do { printk(fmt , ##args); } while (0)
#else
#define DPRINTF(fmt, args...)
#endif

typedef struct le_private {
    uint32_t *dmaregs;
    uint32_t *regs;
} le_private_t;

static void
ob_sbus_node_init(uint64_t base)
{
    void *regs;

    push_str("/iommu/sbus");
    fword("find-device");

    PUSH(base >> 32);
    fword("encode-int");
    PUSH(base & 0xffffffff);
    fword("encode-int");
    fword("encode+");
    PUSH(SBUS_REGS);
    fword("encode-int");
    fword("encode+");
    push_str("reg");
    fword("property");

    regs = (void *)ofmem_map_io(base, SBUS_REGS);
    PUSH((unsigned long)regs);
    fword("encode-int");
    push_str("address");
    fword("property");
}

static void
ob_le_init(unsigned int slot, uint64_t base, unsigned long leoffset, unsigned long dmaoffset)
{
    le_private_t *le;

    le = malloc(sizeof(le_private_t));
    if (!le) {
        DPRINTF("Can't allocate LANCE private structure\n");
        return;
    }

    /* Get the IO region for DMA registers */
    le->dmaregs = (void *)ofmem_map_io(base + (uint64_t)dmaoffset, LEDMA_REGS);
    if (le->dmaregs == NULL) {
        DPRINTF("Can't map LANCE DMA registers\n");
        return;
    }

    /* Now it appears that the Solaris kernel forgets to set up the LANCE DMA mapping
       and so it must inherit the one from OpenBIOS. The symptom of this is that the
       LANCE DMA base addr register is still zero, and so we start sending network 
       packets containing random areas of memory.
       
       The correct fix for this should be to use dvma_alloc() to grab a section of
       memory and point the LANCE DMA buffers to use that instead; this gets
       slightly further but still crashes. Time-consuming investigation on various
       hacked versions of QEMU seems to indicate that Solaris always assumes the LANCE 
       DMA base address is fixed 0xff000000 when setting up the IOMMU for the LANCE
       card. Hence we imitate this behaviour here. */
    le->dmaregs[3] = 0xff000000;
    
    push_str("/iommu/sbus/ledma");
    fword("find-device");
    PUSH(slot);
    fword("encode-int");
    PUSH(dmaoffset);
    fword("encode-int");
    fword("encode+");
    PUSH(0x00000020);
    fword("encode-int");
    fword("encode+");
    push_str("reg");
    fword("property");

    /* Get the IO region for Lance registers */
    le->regs = (void *)ofmem_map_io(base + (uint64_t)leoffset, LE_REGS);
    if (le->regs == NULL) {
        DPRINTF("Can't map LANCE registers\n");
        return;
    }
    
    push_str("/iommu/sbus/ledma/le");
    fword("find-device");
    PUSH(slot);
    fword("encode-int");
    PUSH(leoffset);
    fword("encode-int");
    fword("encode+");
    PUSH(0x00000004);
    fword("encode-int");
    fword("encode+");
    push_str("reg");
    fword("property");
}

uint16_t graphic_depth;

static void
ob_tcx_init(unsigned int slot, const char *path)
{
    char buf[6];

    printk("No display device located during SBus probe - falling back to internal TCX driver\n");

    /* Make the sbus node the current instance and active package for probing */
    feval("active-package my-self");
    push_str("/iommu/sbus");
    feval("2dup find-device open-dev to my-self");

    fword("new-device");
    PUSH(0);
    PUSH(0);
    snprintf(buf, 6, "%x,0", slot);
    push_str(buf);
    fword("set-args");
    feval("['] tcx-driver-fcode 2 cells + 1 byte-load");
    fword("finish-device");

    /* Restore */
    feval("to my-self active-package!");
}

static void
ob_apc_init(unsigned int slot, unsigned long base)
{
    push_str("/iommu/sbus");
    fword("find-device");
    fword("new-device");

    push_str("power-management");
    fword("device-name");

    PUSH(slot);
    fword("encode-int");
    PUSH(base);
    fword("encode-int");
    fword("encode+");
    PUSH(APC_REGS);
    fword("encode-int");
    fword("encode+");
    push_str("reg");
    fword("property");

    fword("finish-device");
}

static void
ob_cs4231_init(unsigned int slot)
{
    push_str("/iommu/sbus");
    fword("find-device");
    fword("new-device");

    push_str("SUNW,CS4231");
    fword("device-name");

    push_str("serial");
    fword("device-type");

    PUSH(slot);
    fword("encode-int");
    PUSH(CS4231_OFFSET);
    fword("encode-int");
    fword("encode+");
    PUSH(CS4231_REGS);
    fword("encode-int");
    fword("encode+");
    push_str("reg");
    fword("property");

    PUSH(5);
    fword("encode-int");
    PUSH(0);
    fword("encode-int");
    fword("encode+");
    push_str("intr");
    fword("property");

    PUSH(5);
    fword("encode-int");
    push_str("interrupts");
    fword("property");

    push_str("audio");
    fword("encode-string");
    push_str("alias");
    fword("property");

    fword("finish-device");
}

static void
ob_macio_init(unsigned int slot, uint64_t base, unsigned long offset)
{
    // All devices were integrated to NCR89C100, see
    // http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt

    // NCR 53c9x, aka ESP. See
    // http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR53C9X.txt
#ifdef CONFIG_DRIVER_ESP
    ob_esp_init(slot, base, offset + MACIO_ESP, offset + MACIO_ESPDMA);
#endif

    // NCR 92C990, Am7990, Lance. See http://www.amd.com
    ob_le_init(slot, base, offset + 0x00c00000, offset + 0x00400010);

    // Parallel port
    //ob_bpp_init(base);
}

static void
sbus_probe_self(unsigned int slot, unsigned long offset)
{
    /* Wrapper for calling probe-self in Forth. This is mainly because some
       drivers don't handle properties correctly when the sbus node is set
       as the current instance during probe. */
    char buf[6];

    printk("Probing SBus slot %d offset %ld\n", slot, offset);

    /* Make the sbus node the current instance and active package for probing */
    feval("active-package my-self");
    push_str("/iommu/sbus");
    feval("open-dev to my-self");

    PUSH(0);
    PUSH(0);
    snprintf(buf, 6, "%x,%lx", slot, offset);
    push_str(buf);
    fword("2dup");
    fword("probe-self-sbus");

    /* Restore */
    feval("to my-self active-package!");
}

static int
sbus_probe_sucess(void)
{
    /* Return true if the last sbus_probe_self() resulted in
       the successful detection and execution of FCode */
    fword("probe-fcode?");
    return POP();
}

static void
sbus_probe_slot_ss5(unsigned int slot, uint64_t base)
{
    /* Probe the slot */
    sbus_probe_self(slot, 0);

    /* If the device was successfully created by FCode then do nothing */
    if (sbus_probe_sucess()) {
        return;
    }

    switch(slot) {
    case 3: // SUNW,tcx
        ob_tcx_init(slot, "/iommu/sbus/SUNW,tcx");
        break;
    case 4:
        // SUNW,CS4231
        ob_cs4231_init(slot);
        // Power management (APC)
        ob_apc_init(slot, APC_OFFSET);
        break;
    case 5: // MACIO: le, esp, bpp
        ob_macio_init(slot, base, 0x08000000);
        break;
    default:
        break;
    }
}

static void
sbus_probe_slot_ss10(unsigned int slot, uint64_t base)
{
    /* Probe the slot */
    sbus_probe_self(slot, 0);

    /* If the device was successfully created by FCode then do nothing */
    if (sbus_probe_sucess()) {
        return;
    }

    switch(slot) {
    case 2: // SUNW,tcx
        ob_tcx_init(slot, "/iommu/sbus/SUNW,tcx");
        break;
    case 0xf: // le, esp, bpp, power-management
        ob_macio_init(slot, base, 0);
        // Power management (APC) XXX should not exist
        ob_apc_init(slot, APC_OFFSET);
        break;
    default:
        break;
    }
}

static void
sbus_probe_slot_ss600mp(unsigned int slot, uint64_t base)
{
    /* Probe the slot */
    sbus_probe_self(slot, 0);

    /* If the device was successfully created by FCode then do nothing */
    if (sbus_probe_sucess()) {
        return;
    }

    switch(slot) {
    case 2: // SUNW,tcx
        ob_tcx_init(slot, "/iommu/sbus/SUNW,tcx");
        break;
    case 0xf: // le, esp, bpp, power-management
#ifdef CONFIG_DRIVER_ESP
        ob_esp_init(slot, base, SS600MP_ESP, SS600MP_ESPDMA);
#endif
        // NCR 92C990, Am7990, Lance. See http://www.amd.com
        ob_le_init(slot, base, 0x00060000, SS600MP_LEBUFFER);
        // Power management (APC) XXX should not exist
        ob_apc_init(slot, APC_OFFSET);
        break;
    default:
        break;
    }
}

struct sbus_offset {
    int slot, type;
    uint64_t base;
    unsigned long size;
};

static const struct sbus_offset sbus_offsets_ss5[SBUS_SLOTS] = {
    { 0, 0, 0x20000000, 0x10000000,},
    { 1, 0, 0x30000000, 0x10000000,},
    { 2, 0, 0x40000000, 0x10000000,},
    { 3, 0, 0x50000000, 0x10000000,},
    { 4, 0, 0x60000000, 0x10000000,},
    { 5, 0, 0x70000000, 0x10000000,},
};

/* Shared with ss600mp */
static const struct sbus_offset sbus_offsets_ss10[SBUS_SLOTS] = {
    { 0, 0, 0xe00000000ULL, 0x10000000,},
    { 1, 0, 0xe10000000ULL, 0x10000000,},
    { 2, 0, 0xe20000000ULL, 0x10000000,},
    { 3, 0, 0xe30000000ULL, 0x10000000,},
    [0xf] = { 0xf, 0, 0xef0000000ULL, 0x10000000,},
};

static void
ob_add_sbus_range(const struct sbus_offset *range, int notfirst)
{
    if (!notfirst) {
        push_str("/iommu/sbus");
        fword("find-device");
    }
    PUSH(range->slot);
    fword("encode-int");
    if (notfirst)
        fword("encode+");
    PUSH(range->type);
    fword("encode-int");
    fword("encode+");
    PUSH(range->base >> 32);
    fword("encode-int");
    fword("encode+");
    PUSH(range->base & 0xffffffff);
    fword("encode-int");
    fword("encode+");
    PUSH(range->size);
    fword("encode-int");
    fword("encode+");
}

static int
ob_sbus_init_ss5(void)
{
    unsigned int slot;
    int notfirst = 0;

    for (slot = 0; slot < SBUS_SLOTS; slot++) {
        if (sbus_offsets_ss5[slot].size > 0)
            ob_add_sbus_range(&sbus_offsets_ss5[slot], notfirst++);
    }
    push_str("ranges");
    fword("property");

    for (slot = 0; slot < SBUS_SLOTS; slot++) {
        if (sbus_offsets_ss5[slot].size > 0)
            sbus_probe_slot_ss5(slot, sbus_offsets_ss5[slot].base);
    }

    return 0;
}

static int
ob_sbus_init_ss10(void)
{
    unsigned int slot;
    int notfirst = 0;

    for (slot = 0; slot < SBUS_SLOTS; slot++) {
        if (sbus_offsets_ss10[slot].size > 0)
            ob_add_sbus_range(&sbus_offsets_ss10[slot], notfirst++);
    }
    push_str("ranges");
    fword("property");

    for (slot = 0; slot < SBUS_SLOTS; slot++) {
        if (sbus_offsets_ss10[slot].size > 0)
            sbus_probe_slot_ss10(slot, sbus_offsets_ss10[slot].base);
    }

    return 0;
}

static int
ob_sbus_init_ss600mp(void)
{
    unsigned int slot;
    int notfirst = 0;

    for (slot = 0; slot < SBUS_SLOTS; slot++) {
        if (sbus_offsets_ss10[slot].size > 0)
            ob_add_sbus_range(&sbus_offsets_ss10[slot], notfirst++);
    }
    push_str("ranges");
    fword("property");

    for (slot = 0; slot < SBUS_SLOTS; slot++) {
        if (sbus_offsets_ss10[slot].size > 0)
            sbus_probe_slot_ss600mp(slot, sbus_offsets_ss10[slot].base);
    }

    return 0;
}

int ob_sbus_init(uint64_t base, int machine_id)
{
    ob_sbus_node_init(base);

    switch (machine_id) {
    case 66:
        return ob_sbus_init_ss600mp();
    case 64 ... 65:
        return ob_sbus_init_ss10();
    case 32 ... 63:
        return ob_sbus_init_ss5();
    default:
        return -1;
    }
}
