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qemu-patch-raspberry4/hw/tsc2005.c
Jan Kiszka 8217606e6e Introduce reset notifier order 
Add the parameter 'order' to qemu_register_reset and sort callbacks on
registration. On system reset, callbacks with lower order will be
invoked before those with higher order. Update all existing users to the
standard order 0.

Note: At least for x86, the existing users seem to assume that handlers
are called in their registration order. Therefore, the patch preserves
this property. If someone feels bored, (s)he could try to identify this
dependency and express it properly on callback registration.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-05-22 10:50:34 -05:00

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/*
* TI TSC2005 emulator.
*
* Copyright (c) 2006 Andrzej Zaborowski <balrog@zabor.org>
* Copyright (C) 2008 Nokia Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 or
* (at your option) version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "hw.h"
#include "qemu-timer.h"
#include "console.h"
#include "devices.h"
#define TSC_CUT_RESOLUTION(value, p) ((value) >> (16 - (p ? 12 : 10)))
typedef struct {
qemu_irq pint; /* Combination of the nPENIRQ and DAV signals */
QEMUTimer *timer;
uint16_t model;
int x, y;
int pressure;
int state, reg, irq, command;
uint16_t data, dav;
int busy;
int enabled;
int host_mode;
int function;
int nextfunction;
int precision;
int nextprecision;
int filter;
int pin_func;
int timing[2];
int noise;
int reset;
int pdst;
int pnd0;
uint16_t temp_thr[2];
uint16_t aux_thr[2];
int tr[8];
} TSC2005State;
enum {
TSC_MODE_XYZ_SCAN = 0x0,
TSC_MODE_XY_SCAN,
TSC_MODE_X,
TSC_MODE_Y,
TSC_MODE_Z,
TSC_MODE_AUX,
TSC_MODE_TEMP1,
TSC_MODE_TEMP2,
TSC_MODE_AUX_SCAN,
TSC_MODE_X_TEST,
TSC_MODE_Y_TEST,
TSC_MODE_TS_TEST,
TSC_MODE_RESERVED,
TSC_MODE_XX_DRV,
TSC_MODE_YY_DRV,
TSC_MODE_YX_DRV,
};
static const uint16_t mode_regs[16] = {
0xf000, /* X, Y, Z scan */
0xc000, /* X, Y scan */
0x8000, /* X */
0x4000, /* Y */
0x3000, /* Z */
0x0800, /* AUX */
0x0400, /* TEMP1 */
0x0200, /* TEMP2 */
0x0800, /* AUX scan */
0x0040, /* X test */
0x0020, /* Y test */
0x0080, /* Short-circuit test */
0x0000, /* Reserved */
0x0000, /* X+, X- drivers */
0x0000, /* Y+, Y- drivers */
0x0000, /* Y+, X- drivers */
};
#define X_TRANSFORM(s) \
((s->y * s->tr[0] - s->x * s->tr[1]) / s->tr[2] + s->tr[3])
#define Y_TRANSFORM(s) \
((s->y * s->tr[4] - s->x * s->tr[5]) / s->tr[6] + s->tr[7])
#define Z1_TRANSFORM(s) \
((400 - ((s)->x >> 7) + ((s)->pressure << 10)) << 4)
#define Z2_TRANSFORM(s) \
((4000 + ((s)->y >> 7) - ((s)->pressure << 10)) << 4)
#define AUX_VAL (700 << 4) /* +/- 3 at 12-bit */
#define TEMP1_VAL (1264 << 4) /* +/- 5 at 12-bit */
#define TEMP2_VAL (1531 << 4) /* +/- 5 at 12-bit */
static uint16_t tsc2005_read(TSC2005State *s, int reg)
{
uint16_t ret;
switch (reg) {
case 0x0: /* X */
s->dav &= ~mode_regs[TSC_MODE_X];
return TSC_CUT_RESOLUTION(X_TRANSFORM(s), s->precision) +
(s->noise & 3);
case 0x1: /* Y */
s->dav &= ~mode_regs[TSC_MODE_Y];
s->noise ++;
return TSC_CUT_RESOLUTION(Y_TRANSFORM(s), s->precision) ^
(s->noise & 3);
case 0x2: /* Z1 */
s->dav &= 0xdfff;
return TSC_CUT_RESOLUTION(Z1_TRANSFORM(s), s->precision) -
(s->noise & 3);
case 0x3: /* Z2 */
s->dav &= 0xefff;
return TSC_CUT_RESOLUTION(Z2_TRANSFORM(s), s->precision) |
(s->noise & 3);
case 0x4: /* AUX */
s->dav &= ~mode_regs[TSC_MODE_AUX];
return TSC_CUT_RESOLUTION(AUX_VAL, s->precision);
case 0x5: /* TEMP1 */
s->dav &= ~mode_regs[TSC_MODE_TEMP1];
return TSC_CUT_RESOLUTION(TEMP1_VAL, s->precision) -
(s->noise & 5);
case 0x6: /* TEMP2 */
s->dav &= 0xdfff;
s->dav &= ~mode_regs[TSC_MODE_TEMP2];
return TSC_CUT_RESOLUTION(TEMP2_VAL, s->precision) ^
(s->noise & 3);
case 0x7: /* Status */
ret = s->dav | (s->reset << 7) | (s->pdst << 2) | 0x0;
s->dav &= ~(mode_regs[TSC_MODE_X_TEST] | mode_regs[TSC_MODE_Y_TEST] |
mode_regs[TSC_MODE_TS_TEST]);
s->reset = 1;
return ret;
case 0x8: /* AUX high treshold */
return s->aux_thr[1];
case 0x9: /* AUX low treshold */
return s->aux_thr[0];
case 0xa: /* TEMP high treshold */
return s->temp_thr[1];
case 0xb: /* TEMP low treshold */
return s->temp_thr[0];
case 0xc: /* CFR0 */
return (s->pressure << 15) | ((!s->busy) << 14) |
(s->nextprecision << 13) | s->timing[0];
case 0xd: /* CFR1 */
return s->timing[1];
case 0xe: /* CFR2 */
return (s->pin_func << 14) | s->filter;
case 0xf: /* Function select status */
return s->function >= 0 ? 1 << s->function : 0;
}
/* Never gets here */
return 0xffff;
}
static void tsc2005_write(TSC2005State *s, int reg, uint16_t data)
{
switch (reg) {
case 0x8: /* AUX high treshold */
s->aux_thr[1] = data;
break;
case 0x9: /* AUX low treshold */
s->aux_thr[0] = data;
break;
case 0xa: /* TEMP high treshold */
s->temp_thr[1] = data;
break;
case 0xb: /* TEMP low treshold */
s->temp_thr[0] = data;
break;
case 0xc: /* CFR0 */
s->host_mode = data >> 15;
if (s->enabled != !(data & 0x4000)) {
s->enabled = !(data & 0x4000);
fprintf(stderr, "%s: touchscreen sense %sabled\n",
__FUNCTION__, s->enabled ? "en" : "dis");
if (s->busy && !s->enabled)
qemu_del_timer(s->timer);
s->busy &= s->enabled;
}
s->nextprecision = (data >> 13) & 1;
s->timing[0] = data & 0x1fff;
if ((s->timing[0] >> 11) == 3)
fprintf(stderr, "%s: illegal conversion clock setting\n",
__FUNCTION__);
break;
case 0xd: /* CFR1 */
s->timing[1] = data & 0xf07;
break;
case 0xe: /* CFR2 */
s->pin_func = (data >> 14) & 3;
s->filter = data & 0x3fff;
break;
default:
fprintf(stderr, "%s: write into read-only register %x\n",
__FUNCTION__, reg);
}
}
/* This handles most of the chip's logic. */
static void tsc2005_pin_update(TSC2005State *s)
{
int64_t expires;
int pin_state;
switch (s->pin_func) {
case 0:
pin_state = !s->pressure && !!s->dav;
break;
case 1:
case 3:
default:
pin_state = !s->dav;
break;
case 2:
pin_state = !s->pressure;
}
if (pin_state != s->irq) {
s->irq = pin_state;
qemu_set_irq(s->pint, s->irq);
}
switch (s->nextfunction) {
case TSC_MODE_XYZ_SCAN:
case TSC_MODE_XY_SCAN:
if (!s->host_mode && s->dav)
s->enabled = 0;
if (!s->pressure)
return;
/* Fall through */
case TSC_MODE_AUX_SCAN:
break;
case TSC_MODE_X:
case TSC_MODE_Y:
case TSC_MODE_Z:
if (!s->pressure)
return;
/* Fall through */
case TSC_MODE_AUX:
case TSC_MODE_TEMP1:
case TSC_MODE_TEMP2:
case TSC_MODE_X_TEST:
case TSC_MODE_Y_TEST:
case TSC_MODE_TS_TEST:
if (s->dav)
s->enabled = 0;
break;
case TSC_MODE_RESERVED:
case TSC_MODE_XX_DRV:
case TSC_MODE_YY_DRV:
case TSC_MODE_YX_DRV:
default:
return;
}
if (!s->enabled || s->busy)
return;
s->busy = 1;
s->precision = s->nextprecision;
s->function = s->nextfunction;
s->pdst = !s->pnd0; /* Synchronised on internal clock */
expires = qemu_get_clock(vm_clock) + (ticks_per_sec >> 7);
qemu_mod_timer(s->timer, expires);
}
static void tsc2005_reset(TSC2005State *s)
{
s->state = 0;
s->pin_func = 0;
s->enabled = 0;
s->busy = 0;
s->nextprecision = 0;
s->nextfunction = 0;
s->timing[0] = 0;
s->timing[1] = 0;
s->irq = 0;
s->dav = 0;
s->reset = 0;
s->pdst = 1;
s->pnd0 = 0;
s->function = -1;
s->temp_thr[0] = 0x000;
s->temp_thr[1] = 0xfff;
s->aux_thr[0] = 0x000;
s->aux_thr[1] = 0xfff;
tsc2005_pin_update(s);
}
static uint8_t tsc2005_txrx_word(void *opaque, uint8_t value)
{
TSC2005State *s = opaque;
uint32_t ret = 0;
switch (s->state ++) {
case 0:
if (value & 0x80) {
/* Command */
if (value & (1 << 1))
tsc2005_reset(s);
else {
s->nextfunction = (value >> 3) & 0xf;
s->nextprecision = (value >> 2) & 1;
if (s->enabled != !(value & 1)) {
s->enabled = !(value & 1);
fprintf(stderr, "%s: touchscreen sense %sabled\n",
__FUNCTION__, s->enabled ? "en" : "dis");
if (s->busy && !s->enabled)
qemu_del_timer(s->timer);
s->busy &= s->enabled;
}
tsc2005_pin_update(s);
}
s->state = 0;
} else if (value) {
/* Data transfer */
s->reg = (value >> 3) & 0xf;
s->pnd0 = (value >> 1) & 1;
s->command = value & 1;
if (s->command) {
/* Read */
s->data = tsc2005_read(s, s->reg);
tsc2005_pin_update(s);
} else
s->data = 0;
} else
s->state = 0;
break;
case 1:
if (s->command)
ret = (s->data >> 8) & 0xff;
else
s->data |= value << 8;
break;
case 2:
if (s->command)
ret = s->data & 0xff;
else {
s->data |= value;
tsc2005_write(s, s->reg, s->data);
tsc2005_pin_update(s);
}
s->state = 0;
break;
}
return ret;
}
uint32_t tsc2005_txrx(void *opaque, uint32_t value, int len)
{
uint32_t ret = 0;
len &= ~7;
while (len > 0) {
len -= 8;
ret |= tsc2005_txrx_word(opaque, (value >> len) & 0xff) << len;
}
return ret;
}
static void tsc2005_timer_tick(void *opaque)
{
TSC2005State *s = opaque;
/* Timer ticked -- a set of conversions has been finished. */
if (!s->busy)
return;
s->busy = 0;
s->dav |= mode_regs[s->function];
s->function = -1;
tsc2005_pin_update(s);
}
static void tsc2005_touchscreen_event(void *opaque,
int x, int y, int z, int buttons_state)
{
TSC2005State *s = opaque;
int p = s->pressure;
if (buttons_state) {
s->x = x;
s->y = y;
}
s->pressure = !!buttons_state;
/*
* Note: We would get better responsiveness in the guest by
* signaling TS events immediately, but for now we simulate
* the first conversion delay for sake of correctness.
*/
if (p != s->pressure)
tsc2005_pin_update(s);
}
static void tsc2005_save(QEMUFile *f, void *opaque)
{
TSC2005State *s = (TSC2005State *) opaque;
int i;
qemu_put_be16(f, s->x);
qemu_put_be16(f, s->y);
qemu_put_byte(f, s->pressure);
qemu_put_byte(f, s->state);
qemu_put_byte(f, s->reg);
qemu_put_byte(f, s->command);
qemu_put_byte(f, s->irq);
qemu_put_be16s(f, &s->dav);
qemu_put_be16s(f, &s->data);
qemu_put_timer(f, s->timer);
qemu_put_byte(f, s->enabled);
qemu_put_byte(f, s->host_mode);
qemu_put_byte(f, s->function);
qemu_put_byte(f, s->nextfunction);
qemu_put_byte(f, s->precision);
qemu_put_byte(f, s->nextprecision);
qemu_put_be16(f, s->filter);
qemu_put_byte(f, s->pin_func);
qemu_put_be16(f, s->timing[0]);
qemu_put_be16(f, s->timing[1]);
qemu_put_be16s(f, &s->temp_thr[0]);
qemu_put_be16s(f, &s->temp_thr[1]);
qemu_put_be16s(f, &s->aux_thr[0]);
qemu_put_be16s(f, &s->aux_thr[1]);
qemu_put_be32(f, s->noise);
qemu_put_byte(f, s->reset);
qemu_put_byte(f, s->pdst);
qemu_put_byte(f, s->pnd0);
for (i = 0; i < 8; i ++)
qemu_put_be32(f, s->tr[i]);
}
static int tsc2005_load(QEMUFile *f, void *opaque, int version_id)
{
TSC2005State *s = (TSC2005State *) opaque;
int i;
s->x = qemu_get_be16(f);
s->y = qemu_get_be16(f);
s->pressure = qemu_get_byte(f);
s->state = qemu_get_byte(f);
s->reg = qemu_get_byte(f);
s->command = qemu_get_byte(f);
s->irq = qemu_get_byte(f);
qemu_get_be16s(f, &s->dav);
qemu_get_be16s(f, &s->data);
qemu_get_timer(f, s->timer);
s->enabled = qemu_get_byte(f);
s->host_mode = qemu_get_byte(f);
s->function = qemu_get_byte(f);
s->nextfunction = qemu_get_byte(f);
s->precision = qemu_get_byte(f);
s->nextprecision = qemu_get_byte(f);
s->filter = qemu_get_be16(f);
s->pin_func = qemu_get_byte(f);
s->timing[0] = qemu_get_be16(f);
s->timing[1] = qemu_get_be16(f);
qemu_get_be16s(f, &s->temp_thr[0]);
qemu_get_be16s(f, &s->temp_thr[1]);
qemu_get_be16s(f, &s->aux_thr[0]);
qemu_get_be16s(f, &s->aux_thr[1]);
s->noise = qemu_get_be32(f);
s->reset = qemu_get_byte(f);
s->pdst = qemu_get_byte(f);
s->pnd0 = qemu_get_byte(f);
for (i = 0; i < 8; i ++)
s->tr[i] = qemu_get_be32(f);
s->busy = qemu_timer_pending(s->timer);
tsc2005_pin_update(s);
return 0;
}
void *tsc2005_init(qemu_irq pintdav)
{
TSC2005State *s;
s = (TSC2005State *)
qemu_mallocz(sizeof(TSC2005State));
s->x = 400;
s->y = 240;
s->pressure = 0;
s->precision = s->nextprecision = 0;
s->timer = qemu_new_timer(vm_clock, tsc2005_timer_tick, s);
s->pint = pintdav;
s->model = 0x2005;
s->tr[0] = 0;
s->tr[1] = 1;
s->tr[2] = 1;
s->tr[3] = 0;
s->tr[4] = 1;
s->tr[5] = 0;
s->tr[6] = 1;
s->tr[7] = 0;
tsc2005_reset(s);
qemu_add_mouse_event_handler(tsc2005_touchscreen_event, s, 1,
"QEMU TSC2005-driven Touchscreen");
qemu_register_reset((void *) tsc2005_reset, 0, s);
register_savevm("tsc2005", -1, 0, tsc2005_save, tsc2005_load, s);
return s;
}
/*
* Use tslib generated calibration data to generate ADC input values
* from the touchscreen. Assuming 12-bit precision was used during
* tslib calibration.
*/
void tsc2005_set_transform(void *opaque, MouseTransformInfo *info)
{
TSC2005State *s = (TSC2005State *) opaque;
/* This version assumes touchscreen X & Y axis are parallel or
* perpendicular to LCD's X & Y axis in some way. */
if (abs(info->a[0]) > abs(info->a[1])) {
s->tr[0] = 0;
s->tr[1] = -info->a[6] * info->x;
s->tr[2] = info->a[0];
s->tr[3] = -info->a[2] / info->a[0];
s->tr[4] = info->a[6] * info->y;
s->tr[5] = 0;
s->tr[6] = info->a[4];
s->tr[7] = -info->a[5] / info->a[4];
} else {
s->tr[0] = info->a[6] * info->y;
s->tr[1] = 0;
s->tr[2] = info->a[1];
s->tr[3] = -info->a[2] / info->a[1];
s->tr[4] = 0;
s->tr[5] = -info->a[6] * info->x;
s->tr[6] = info->a[3];
s->tr[7] = -info->a[5] / info->a[3];
}
s->tr[0] >>= 11;
s->tr[1] >>= 11;
s->tr[3] <<= 4;
s->tr[4] >>= 11;
s->tr[5] >>= 11;
s->tr[7] <<= 4;
}
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