// SPDX-License-Identifier: GPL-2.0
#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 <linux/of.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/xmon.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_each_node_by_name(np, "keyboard") {
struct device_node *parent = of_get_parent(np);
int found = of_node_is_type(parent, "adb");
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;
}
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