udbg_adb.c

Go to the documentation of this file.

#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/bitops.h>
#include <linux/ptrace.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/cuda.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/xmon.h>
#include <asm/prom.h>
#include <asm/bootx.h>
#include <asm/errno.h>
#include <asm/pmac_feature.h>
#include <asm/processor.h>
#include <asm/delay.h>
#include <asm/btext.h>
#include <asm/time.h>
#include <asm/udbg.h>

/*
 * This implementation is "special", it can "patch" the current
 * udbg implementation and work on top of it. It must thus be
 * initialized last
 */

static void (*udbg_adb_old_putc)(char c);
static int (*udbg_adb_old_getc)(void);
static int (*udbg_adb_old_getc_poll)(void);

static enum {
    input_adb_none,
    input_adb_pmu,
    input_adb_cuda,
} input_type = input_adb_none;

int xmon_wants_key, xmon_adb_keycode;

static inline void udbg_adb_poll(void)
{
#ifdef CONFIG_ADB_PMU
    if (input_type == input_adb_pmu)
        pmu_poll_adb();
#endif /* CONFIG_ADB_PMU */
#ifdef CONFIG_ADB_CUDA
    if (input_type == input_adb_cuda)
        cuda_poll();
#endif /* CONFIG_ADB_CUDA */
}

#ifdef CONFIG_BOOTX_TEXT

static int udbg_adb_use_btext;
static int xmon_adb_shiftstate;

static unsigned char xmon_keytab[128] =
    "asdfhgzxcv\000bqwer"               /* 0x00 - 0x0f */
    "yt123465=97-80]o"              /* 0x10 - 0x1f */
    "u[ip\rlj'k;\\,/nm."                /* 0x20 - 0x2f */
    "\t `\177\0\033\0\0\0\0\0\0\0\0\0\0"        /* 0x30 - 0x3f */
    "\0.\0*\0+\0\0\0\0\0/\r\0-\0"           /* 0x40 - 0x4f */
    "\0\0000123456789\0\0\0";           /* 0x50 - 0x5f */

static unsigned char xmon_shift_keytab[128] =
    "ASDFHGZXCV\000BQWER"               /* 0x00 - 0x0f */
    "YT!@#$^%+(&_*)}O"              /* 0x10 - 0x1f */
    "U{IP\rLJ\"K:|<?NM>"                /* 0x20 - 0x2f */
    "\t ~\177\0\033\0\0\0\0\0\0\0\0\0\0"        /* 0x30 - 0x3f */
    "\0.\0*\0+\0\0\0\0\0/\r\0-\0"           /* 0x40 - 0x4f */
    "\0\0000123456789\0\0\0";           /* 0x50 - 0x5f */

static int udbg_adb_local_getc(void)
{
    int k, t, on;

    xmon_wants_key = 1;
    for (;;) {
        xmon_adb_keycode = -1;
        t = 0;
        on = 0;
        k = -1;
        do {
            if (--t < 0) {
                on = 1 - on;
                btext_drawchar(on? 0xdb: 0x20);
                btext_drawchar('\b');
                t = 200000;
            }
            udbg_adb_poll();
            if (udbg_adb_old_getc_poll)
                k = udbg_adb_old_getc_poll();
        } while (k == -1 && xmon_adb_keycode == -1);
        if (on)
            btext_drawstring(" \b");
        if (k != -1)
            return k;
        k = xmon_adb_keycode;

        /* test for shift keys */
        if ((k & 0x7f) == 0x38 || (k & 0x7f) == 0x7b) {
            xmon_adb_shiftstate = (k & 0x80) == 0;
            continue;
        }
        if (k >= 0x80)
            continue;   /* ignore up transitions */
        k = (xmon_adb_shiftstate? xmon_shift_keytab: xmon_keytab)[k];
        if (k != 0)
            break;
    }
    xmon_wants_key = 0;
    return k;
}
#endif /* CONFIG_BOOTX_TEXT */

static int udbg_adb_getc(void)
{
#ifdef CONFIG_BOOTX_TEXT
    if (udbg_adb_use_btext && input_type != input_adb_none)
        return udbg_adb_local_getc();
#endif
    if (udbg_adb_old_getc)
        return udbg_adb_old_getc();
    return -1;
}

/* getc_poll() is not really used, unless you have the xmon-over modem
 * hack that doesn't quite concern us here, thus we just poll the low level
 * ADB driver to prevent it from timing out and call back the original poll
 * routine.
 */
static int udbg_adb_getc_poll(void)
{
    udbg_adb_poll();

    if (udbg_adb_old_getc_poll)
        return udbg_adb_old_getc_poll();
    return -1;
}

static void udbg_adb_putc(char c)
{
#ifdef CONFIG_BOOTX_TEXT
    if (udbg_adb_use_btext)
        btext_drawchar(c);
#endif
    if (udbg_adb_old_putc)
        return udbg_adb_old_putc(c);
}

void __init udbg_adb_init_early(void)
{
#ifdef CONFIG_BOOTX_TEXT
    if (btext_find_display(1) == 0) {
        udbg_adb_use_btext = 1;
        udbg_putc = udbg_adb_putc;
    }
#endif
}

int __init udbg_adb_init(int force_btext)
{
    struct device_node *np;

    /* Capture existing callbacks */
    udbg_adb_old_putc = udbg_putc;
    udbg_adb_old_getc = udbg_getc;
    udbg_adb_old_getc_poll = udbg_getc_poll;

    /* Check if our early init was already called */
    if (udbg_adb_old_putc == udbg_adb_putc)
        udbg_adb_old_putc = NULL;
#ifdef CONFIG_BOOTX_TEXT
    if (udbg_adb_old_putc == btext_drawchar)
        udbg_adb_old_putc = NULL;
#endif

    /* Set ours as output */
    udbg_putc = udbg_adb_putc;
    udbg_getc = udbg_adb_getc;
    udbg_getc_poll = udbg_adb_getc_poll;

#ifdef CONFIG_BOOTX_TEXT
    /* Check if we should use btext output */
    if (btext_find_display(force_btext) == 0)
        udbg_adb_use_btext = 1;
#endif

    /* See if there is a keyboard in the device tree with a parent
     * of type "adb". If not, we return a failure, but we keep the
     * bext output set for now
     */
    for (np = NULL; (np = of_find_node_by_name(np, "keyboard")) != NULL;) {
        struct device_node *parent = of_get_parent(np);
        int found = (parent && strcmp(parent->type, "adb") == 0);
        of_node_put(parent);
        if (found)
            break;
    }
    if (np == NULL)
        return -ENODEV;
    of_node_put(np);

#ifdef CONFIG_ADB_PMU
    if (find_via_pmu())
        input_type = input_adb_pmu;
#endif
#ifdef CONFIG_ADB_CUDA
    if (find_via_cuda())
        input_type = input_adb_cuda;
#endif

    /* Same as above: nothing found, keep btext set for output */
    if (input_type == input_adb_none)
        return -ENODEV;

    return 0;
}