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qemu-e2k/hw/lm832x.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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/*
* National Semiconductor LM8322/8323 GPIO keyboard & PWM chips.
*
* Copyright (C) 2008 Nokia Corporation
* Written by Andrzej Zaborowski <andrew@openedhand.com>
*
* 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 "i2c.h"
#include "qemu-timer.h"
#include "console.h"
typedef struct {
i2c_slave i2c;
int i2c_dir;
int i2c_cycle;
int reg;
qemu_irq nirq;
uint16_t model;
struct {
qemu_irq out[2];
int in[2][2];
} mux;
uint8_t config;
uint8_t status;
uint8_t acttime;
uint8_t error;
uint8_t clock;
struct {
uint16_t pull;
uint16_t mask;
uint16_t dir;
uint16_t level;
qemu_irq out[16];
} gpio;
struct {
uint8_t dbnctime;
uint8_t size;
int start;
int len;
uint8_t fifo[16];
} kbd;
struct {
uint16_t file[256];
uint8_t faddr;
uint8_t addr[3];
QEMUTimer *tm[3];
} pwm;
} LM823KbdState;
#define INT_KEYPAD (1 << 0)
#define INT_ERROR (1 << 3)
#define INT_NOINIT (1 << 4)
#define INT_PWMEND(n) (1 << (5 + n))
#define ERR_BADPAR (1 << 0)
#define ERR_CMDUNK (1 << 1)
#define ERR_KEYOVR (1 << 2)
#define ERR_FIFOOVR (1 << 6)
static void lm_kbd_irq_update(LM823KbdState *s)
{
qemu_set_irq(s->nirq, !s->status);
}
static void lm_kbd_gpio_update(LM823KbdState *s)
{
}
static void lm_kbd_reset(LM823KbdState *s)
{
s->config = 0x80;
s->status = INT_NOINIT;
s->acttime = 125;
s->kbd.dbnctime = 3;
s->kbd.size = 0x33;
s->clock = 0x08;
lm_kbd_irq_update(s);
lm_kbd_gpio_update(s);
}
static void lm_kbd_error(LM823KbdState *s, int err)
{
s->error |= err;
s->status |= INT_ERROR;
lm_kbd_irq_update(s);
}
static void lm_kbd_pwm_tick(LM823KbdState *s, int line)
{
}
static void lm_kbd_pwm_start(LM823KbdState *s, int line)
{
lm_kbd_pwm_tick(s, line);
}
static void lm_kbd_pwm0_tick(void *opaque)
{
lm_kbd_pwm_tick(opaque, 0);
}
static void lm_kbd_pwm1_tick(void *opaque)
{
lm_kbd_pwm_tick(opaque, 1);
}
static void lm_kbd_pwm2_tick(void *opaque)
{
lm_kbd_pwm_tick(opaque, 2);
}
enum {
LM832x_CMD_READ_ID = 0x80, /* Read chip ID. */
LM832x_CMD_WRITE_CFG = 0x81, /* Set configuration item. */
LM832x_CMD_READ_INT = 0x82, /* Get interrupt status. */
LM832x_CMD_RESET = 0x83, /* Reset, same as external one */
LM823x_CMD_WRITE_PULL_DOWN = 0x84, /* Select GPIO pull-up/down. */
LM832x_CMD_WRITE_PORT_SEL = 0x85, /* Select GPIO in/out. */
LM832x_CMD_WRITE_PORT_STATE = 0x86, /* Set GPIO pull-up/down. */
LM832x_CMD_READ_PORT_SEL = 0x87, /* Get GPIO in/out. */
LM832x_CMD_READ_PORT_STATE = 0x88, /* Get GPIO pull-up/down. */
LM832x_CMD_READ_FIFO = 0x89, /* Read byte from FIFO. */
LM832x_CMD_RPT_READ_FIFO = 0x8a, /* Read FIFO (no increment). */
LM832x_CMD_SET_ACTIVE = 0x8b, /* Set active time. */
LM832x_CMD_READ_ERROR = 0x8c, /* Get error status. */
LM832x_CMD_READ_ROTATOR = 0x8e, /* Read rotator status. */
LM832x_CMD_SET_DEBOUNCE = 0x8f, /* Set debouncing time. */
LM832x_CMD_SET_KEY_SIZE = 0x90, /* Set keypad size. */
LM832x_CMD_READ_KEY_SIZE = 0x91, /* Get keypad size. */
LM832x_CMD_READ_CFG = 0x92, /* Get configuration item. */
LM832x_CMD_WRITE_CLOCK = 0x93, /* Set clock config. */
LM832x_CMD_READ_CLOCK = 0x94, /* Get clock config. */
LM832x_CMD_PWM_WRITE = 0x95, /* Write PWM script. */
LM832x_CMD_PWM_START = 0x96, /* Start PWM engine. */
LM832x_CMD_PWM_STOP = 0x97, /* Stop PWM engine. */
};
#define LM832x_MAX_KPX 8
#define LM832x_MAX_KPY 12
static uint8_t lm_kbd_read(LM823KbdState *s, int reg, int byte)
{
int ret;
switch (reg) {
case LM832x_CMD_READ_ID:
ret = 0x0400;
break;
case LM832x_CMD_READ_INT:
ret = s->status;
if (!(s->status & INT_NOINIT)) {
s->status = 0;
lm_kbd_irq_update(s);
}
break;
case LM832x_CMD_READ_PORT_SEL:
ret = s->gpio.dir;
break;
case LM832x_CMD_READ_PORT_STATE:
ret = s->gpio.mask;
break;
case LM832x_CMD_READ_FIFO:
if (s->kbd.len <= 1)
return 0x00;
/* Example response from the two commands after a INT_KEYPAD
* interrupt caused by the key 0x3c being pressed:
* RPT_READ_FIFO: 55 bc 00 4e ff 0a 50 08 00 29 d9 08 01 c9 01
* READ_FIFO: bc 00 00 4e ff 0a 50 08 00 29 d9 08 01 c9 01
* RPT_READ_FIFO: bc 00 00 4e ff 0a 50 08 00 29 d9 08 01 c9 01
*
* 55 is the code of the key release event serviced in the previous
* interrupt handling.
*
* TODO: find out whether the FIFO is advanced a single character
* before reading every byte or the whole size of the FIFO at the
* last LM832x_CMD_READ_FIFO. This affects LM832x_CMD_RPT_READ_FIFO
* output in cases where there are more than one event in the FIFO.
* Assume 0xbc and 0x3c events are in the FIFO:
* RPT_READ_FIFO: 55 bc 3c 00 4e ff 0a 50 08 00 29 d9 08 01 c9
* READ_FIFO: bc 3c 00 00 4e ff 0a 50 08 00 29 d9 08 01 c9
* Does RPT_READ_FIFO now return 0xbc and 0x3c or only 0x3c?
*/
s->kbd.start ++;
s->kbd.start &= sizeof(s->kbd.fifo) - 1;
s->kbd.len --;
return s->kbd.fifo[s->kbd.start];
case LM832x_CMD_RPT_READ_FIFO:
if (byte >= s->kbd.len)
return 0x00;
return s->kbd.fifo[(s->kbd.start + byte) & (sizeof(s->kbd.fifo) - 1)];
case LM832x_CMD_READ_ERROR:
return s->error;
case LM832x_CMD_READ_ROTATOR:
return 0;
case LM832x_CMD_READ_KEY_SIZE:
return s->kbd.size;
case LM832x_CMD_READ_CFG:
return s->config & 0xf;
case LM832x_CMD_READ_CLOCK:
return (s->clock & 0xfc) | 2;
default:
lm_kbd_error(s, ERR_CMDUNK);
fprintf(stderr, "%s: unknown command %02x\n", __FUNCTION__, reg);
return 0x00;
}
return ret >> (byte << 3);
}
static void lm_kbd_write(LM823KbdState *s, int reg, int byte, uint8_t value)
{
switch (reg) {
case LM832x_CMD_WRITE_CFG:
s->config = value;
/* This must be done whenever s->mux.in is updated (never). */
if ((s->config >> 1) & 1) /* MUX1EN */
qemu_set_irq(s->mux.out[0], s->mux.in[0][(s->config >> 0) & 1]);
if ((s->config >> 3) & 1) /* MUX2EN */
qemu_set_irq(s->mux.out[0], s->mux.in[0][(s->config >> 2) & 1]);
/* TODO: check that this is issued only following the chip reset
* and not in the middle of operation and that it is followed by
* the GPIO ports re-resablishing through WRITE_PORT_SEL and
* WRITE_PORT_STATE (using a timer perhaps) and otherwise output
* warnings. */
s->status = 0;
lm_kbd_irq_update(s);
s->kbd.len = 0;
s->kbd.start = 0;
s->reg = -1;
break;
case LM832x_CMD_RESET:
if (value == 0xaa)
lm_kbd_reset(s);
else
lm_kbd_error(s, ERR_BADPAR);
s->reg = -1;
break;
case LM823x_CMD_WRITE_PULL_DOWN:
if (!byte)
s->gpio.pull = value;
else {
s->gpio.pull |= value << 8;
lm_kbd_gpio_update(s);
s->reg = -1;
}
break;
case LM832x_CMD_WRITE_PORT_SEL:
if (!byte)
s->gpio.dir = value;
else {
s->gpio.dir |= value << 8;
lm_kbd_gpio_update(s);
s->reg = -1;
}
break;
case LM832x_CMD_WRITE_PORT_STATE:
if (!byte)
s->gpio.mask = value;
else {
s->gpio.mask |= value << 8;
lm_kbd_gpio_update(s);
s->reg = -1;
}
break;
case LM832x_CMD_SET_ACTIVE:
s->acttime = value;
s->reg = -1;
break;
case LM832x_CMD_SET_DEBOUNCE:
s->kbd.dbnctime = value;
s->reg = -1;
if (!value)
lm_kbd_error(s, ERR_BADPAR);
break;
case LM832x_CMD_SET_KEY_SIZE:
s->kbd.size = value;
s->reg = -1;
if (
(value & 0xf) < 3 || (value & 0xf) > LM832x_MAX_KPY ||
(value >> 4) < 3 || (value >> 4) > LM832x_MAX_KPX)
lm_kbd_error(s, ERR_BADPAR);
break;
case LM832x_CMD_WRITE_CLOCK:
s->clock = value;
s->reg = -1;
if ((value & 3) && (value & 3) != 3) {
lm_kbd_error(s, ERR_BADPAR);
fprintf(stderr, "%s: invalid clock setting in RCPWM\n",
__FUNCTION__);
}
/* TODO: Validate that the command is only issued once */
break;
case LM832x_CMD_PWM_WRITE:
if (byte == 0) {
if (!(value & 3) || (value >> 2) > 59) {
lm_kbd_error(s, ERR_BADPAR);
s->reg = -1;
break;
}
s->pwm.faddr = value;
s->pwm.file[s->pwm.faddr] = 0;
} else if (byte == 1) {
s->pwm.file[s->pwm.faddr] |= value << 8;
} else if (byte == 2) {
s->pwm.file[s->pwm.faddr] |= value << 0;
s->reg = -1;
}
break;
case LM832x_CMD_PWM_START:
s->reg = -1;
if (!(value & 3) || (value >> 2) > 59) {
lm_kbd_error(s, ERR_BADPAR);
break;
}
s->pwm.addr[(value & 3) - 1] = value >> 2;
lm_kbd_pwm_start(s, (value & 3) - 1);
break;
case LM832x_CMD_PWM_STOP:
s->reg = -1;
if (!(value & 3)) {
lm_kbd_error(s, ERR_BADPAR);
break;
}
qemu_del_timer(s->pwm.tm[(value & 3) - 1]);
break;
case -1:
lm_kbd_error(s, ERR_BADPAR);
break;
default:
lm_kbd_error(s, ERR_CMDUNK);
fprintf(stderr, "%s: unknown command %02x\n", __FUNCTION__, reg);
break;
}
}
static void lm_i2c_event(i2c_slave *i2c, enum i2c_event event)
{
LM823KbdState *s = FROM_I2C_SLAVE(LM823KbdState, i2c);
switch (event) {
case I2C_START_RECV:
case I2C_START_SEND:
s->i2c_cycle = 0;
s->i2c_dir = (event == I2C_START_SEND);
break;
default:
break;
}
}
static int lm_i2c_rx(i2c_slave *i2c)
{
LM823KbdState *s = FROM_I2C_SLAVE(LM823KbdState, i2c);
return lm_kbd_read(s, s->reg, s->i2c_cycle ++);
}
static int lm_i2c_tx(i2c_slave *i2c, uint8_t data)
{
LM823KbdState *s = (LM823KbdState *) i2c;
if (!s->i2c_cycle)
s->reg = data;
else
lm_kbd_write(s, s->reg, s->i2c_cycle - 1, data);
s->i2c_cycle ++;
return 0;
}
static void lm_kbd_save(QEMUFile *f, void *opaque)
{
LM823KbdState *s = (LM823KbdState *) opaque;
int i;
i2c_slave_save(f, &s->i2c);
qemu_put_byte(f, s->i2c_dir);
qemu_put_byte(f, s->i2c_cycle);
qemu_put_byte(f, (uint8_t) s->reg);
qemu_put_8s(f, &s->config);
qemu_put_8s(f, &s->status);
qemu_put_8s(f, &s->acttime);
qemu_put_8s(f, &s->error);
qemu_put_8s(f, &s->clock);
qemu_put_be16s(f, &s->gpio.pull);
qemu_put_be16s(f, &s->gpio.mask);
qemu_put_be16s(f, &s->gpio.dir);
qemu_put_be16s(f, &s->gpio.level);
qemu_put_byte(f, s->kbd.dbnctime);
qemu_put_byte(f, s->kbd.size);
qemu_put_byte(f, s->kbd.start);
qemu_put_byte(f, s->kbd.len);
qemu_put_buffer(f, s->kbd.fifo, sizeof(s->kbd.fifo));
for (i = 0; i < sizeof(s->pwm.file); i ++)
qemu_put_be16s(f, &s->pwm.file[i]);
qemu_put_8s(f, &s->pwm.faddr);
qemu_put_buffer(f, s->pwm.addr, sizeof(s->pwm.addr));
qemu_put_timer(f, s->pwm.tm[0]);
qemu_put_timer(f, s->pwm.tm[1]);
qemu_put_timer(f, s->pwm.tm[2]);
}
static int lm_kbd_load(QEMUFile *f, void *opaque, int version_id)
{
LM823KbdState *s = (LM823KbdState *) opaque;
int i;
i2c_slave_load(f, &s->i2c);
s->i2c_dir = qemu_get_byte(f);
s->i2c_cycle = qemu_get_byte(f);
s->reg = (int8_t) qemu_get_byte(f);
qemu_get_8s(f, &s->config);
qemu_get_8s(f, &s->status);
qemu_get_8s(f, &s->acttime);
qemu_get_8s(f, &s->error);
qemu_get_8s(f, &s->clock);
qemu_get_be16s(f, &s->gpio.pull);
qemu_get_be16s(f, &s->gpio.mask);
qemu_get_be16s(f, &s->gpio.dir);
qemu_get_be16s(f, &s->gpio.level);
s->kbd.dbnctime = qemu_get_byte(f);
s->kbd.size = qemu_get_byte(f);
s->kbd.start = qemu_get_byte(f);
s->kbd.len = qemu_get_byte(f);
qemu_get_buffer(f, s->kbd.fifo, sizeof(s->kbd.fifo));
for (i = 0; i < sizeof(s->pwm.file); i ++)
qemu_get_be16s(f, &s->pwm.file[i]);
qemu_get_8s(f, &s->pwm.faddr);
qemu_get_buffer(f, s->pwm.addr, sizeof(s->pwm.addr));
qemu_get_timer(f, s->pwm.tm[0]);
qemu_get_timer(f, s->pwm.tm[1]);
qemu_get_timer(f, s->pwm.tm[2]);
lm_kbd_irq_update(s);
lm_kbd_gpio_update(s);
return 0;
}
static void lm8323_init(i2c_slave *i2c)
{
LM823KbdState *s = FROM_I2C_SLAVE(LM823KbdState, i2c);
s->model = 0x8323;
s->pwm.tm[0] = qemu_new_timer(vm_clock, lm_kbd_pwm0_tick, s);
s->pwm.tm[1] = qemu_new_timer(vm_clock, lm_kbd_pwm1_tick, s);
s->pwm.tm[2] = qemu_new_timer(vm_clock, lm_kbd_pwm2_tick, s);
qdev_init_gpio_out(&i2c->qdev, &s->nirq, 1);
lm_kbd_reset(s);
qemu_register_reset((void *) lm_kbd_reset, 0, s);
register_savevm("LM8323", -1, 0, lm_kbd_save, lm_kbd_load, s);
}
void lm832x_key_event(struct i2c_slave *i2c, int key, int state)
{
LM823KbdState *s = (LM823KbdState *) i2c;
if ((s->status & INT_ERROR) && (s->error & ERR_FIFOOVR))
return;
if (s->kbd.len >= sizeof(s->kbd.fifo)) {
lm_kbd_error(s, ERR_FIFOOVR);
return;
}
s->kbd.fifo[(s->kbd.start + s->kbd.len ++) & (sizeof(s->kbd.fifo) - 1)] =
key | (state << 7);
/* We never set ERR_KEYOVR because we support multiple keys fine. */
s->status |= INT_KEYPAD;
lm_kbd_irq_update(s);
}
static I2CSlaveInfo lm8323_info = {
.init = lm8323_init,
.event = lm_i2c_event,
.recv = lm_i2c_rx,
.send = lm_i2c_tx
};
static void lm832x_register_devices(void)
{
i2c_register_slave("lm8323", sizeof(LM823KbdState), &lm8323_info);
}
device_init(lm832x_register_devices)
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