source: mainline/arch/mips32/src/drivers/arc.c@ e5fcf00

/*
 * Copyright (C) 2005 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <arch/drivers/arc.h>
#include <arch/mm/page.h>
#include <print.h>
#include <arch.h>
#include <arch/byteorder.h>
#include <arch/mm/frame.h>
#include <mm/frame.h>
#include <interrupt.h>

/* This is a good joke, SGI HAS different types than NT bioses... */
/* Here is the SGI type */
static char *basetypes[] = {
        "ExceptionBlock",
        "SystemParameterBlock",
        "FreeContiguous",
        "FreeMemory",
        "BadMemory",
        "LoadedProgram",
        "FirmwareTemporary",
        "FirmwarePermanent"
};

static char *ctypes[] = {
        "ARC_type",
        "CPU_type",
        "FPU_type",
        "PrimaryICache",
        "PrimaryDCache",
        "SecondaryICache",
        "SecondaryDCache",
        "SecondaryCache",
        "Memory",
        "EISAAdapter",
        "TCAdapter",
        "SCSIAdapter",
        "DTIAdapter",
        "MultiFunctionAdapter",
        "DiskController",
        "TapeController",
        "CDROMController",
        "WORMController",
        "SerialController",
        "NetworkController",
        "DisplayController",
        "ParallelController",
        "PointerController",
        "KeyboardController",
        "AudioController",
        "OtherController",
        "DiskPeripheral",
        "FloppyDiskPeripheral",
        "TapePeripheral",
        "ModemPeripheral",
        "MonitorPeripheral",
        "PrinterPeripheral",
        "PointerPeripheral",
        "KeyboardPeripheral",
        "TerminalPeripheral",
        "OtherPeripheral",
        "LinePeripheral",
        "NetworkPeripheral"
        "OtherPeripheral",
        "XTalkAdapter",
        "PCIAdapter",
        "GIOAdapter",
        "TPUAdapter",
        "Anonymous"
};

static arc_sbp *sbp = (arc_sbp *)PA2KA(0x1000);
static arc_func_vector_t *arc_entry; 


static void arc_putchar(char ch);

/** Return true if ARC is available */
int arc_enabled(void)
{
        return sbp != NULL;
}

static void arc_print_component(arc_component *c)
{
        int i;

        printf("%s: ",ctypes[c->type]);
        for (i=0;i < c->identifier_len;i++)
                arc_putchar(c->identifier[i]);
        arc_putchar('\n');
}

void arc_print_devices(void)
{
        arc_component *c,*next;

        if (!arc_enabled())
                return;

        c = arc_entry->getchild(NULL);
        while (c) {
                arc_print_component(c);
                next = arc_entry->getchild(c);
                while (!next) {
                        next = arc_entry->getpeer(c);
                        if (!next)
                                c = arc_entry->getparent(c);
                        if (!c)
                                return;
                }
                c = next;
        }
}

void arc_print_memory_map(void)
{
        arc_memdescriptor_t *desc;

        if (!arc_enabled())
                return;

        printf("Memory map:\n");

        desc = arc_entry->getmemorydescriptor(NULL);
        while (desc) {
                printf("%s: %d (size: %dKB)\n",basetypes[desc->type],
                       desc->basepage * ARC_FRAME,
                       desc->basecount*ARC_FRAME/1024);
                desc = arc_entry->getmemorydescriptor(desc);
        }
}

/** Print charactor to console */
static void arc_putchar(char ch)
{
        __u32 cnt;
        ipl_t ipl;

        /* TODO: Should be spinlock? */
        ipl = interrupts_disable();
        arc_entry->write(1, &ch, 1, &cnt);
        interrupts_restore(ipl);
        
}

/** Initialize ARC structure
 *
 * @return 0 - ARC OK, -1 - ARC does not exist
 */
int arc_init(void)
{
        if (sbp->signature != ARC_MAGIC) {
                sbp = NULL;
                return -1;
        }
        arc_entry = sbp->firmwarevector;

        arc_putchar('A');
        arc_putchar('R');
        arc_putchar('C');
        arc_putchar('\n');
}

static bool kbd_polling_enabled;
static chardev_t console;

/** Try to get character, return character or -1 if not available */
static void arc_keyboard_poll(void)
{
        char ch;
        __u32 count;
        long result;
        
        if (! kbd_polling_enabled)
                return;

        if (arc_entry->getreadstatus(0))
                return;
        result = arc_entry->read(0, &ch, 1, &count);
        if (result || count!=1) {
                return;
        }
        if (ch == '\r')
                ch = '\n';
        if (ch == 0x7f)
                ch = '\b';
        
        chardev_push_character(&console, ch);
}

static void arc_write(chardev_t *dev, const char ch)
{
        arc_putchar(ch);
}

static void arc_enable(chardev_t *dev)
{
        kbd_polling_enabled = true;
}

static void arc_disable(chardev_t *dev)
{
        kbd_polling_enabled = false;
}

static chardev_operations_t arc_ops = {
        .resume = arc_enable,
        .suspend = arc_disable,
        .write = arc_write
};

iroutine old_timer;
/** Do polling on timer interrupt */
static void timer_replace(int n, void *stack)
{
        arc_keyboard_poll();
        old_timer(n, stack);
        arc_keyboard_poll();
}


chardev_t * arc_console(void)
{
        kbd_polling_enabled = true;
        
        chardev_initialize("arc_console", &console, &arc_ops);
        old_timer = exc_register(TIMER_IRQ, "arc_kb_poll", timer_replace);
        return &console;
}

/* Initialize frame zones from ARC firmware. 
 * In the future we may use even the FirmwareTemporary regions,
 * currently we use the FreeMemory (what about the LoadedProgram?)
 */
void arc_frame_init(void)
{
        arc_memdescriptor_t *desc;
        int total = 0;

        desc = arc_entry->getmemorydescriptor(NULL);
        while (desc) {
                if (desc->type == FreeMemory ||
                    desc->type == FreeContiguous) {
                        total += desc->basecount*ARC_FRAME;
                        zone_create_in_region(desc->basepage*ARC_FRAME,
                                              desc->basecount*ARC_FRAME);
                }
                desc = arc_entry->getmemorydescriptor(desc);
        }

        config.memory_size = total;
}