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qemu/hw/lm832x.c

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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, see <http://www.gnu.org/licenses/>.
*/
#include "hw/hw.h"
#include "hw/i2c.h"
#include "qemu/timer.h"
#include "ui/console.h"
typedef struct {
I2CSlave i2c;
uint8_t i2c_dir;
uint8_t i2c_cycle;
uint8_t 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;
uint8_t start;
uint8_t 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. */
LM832x_GENERAL_ERROR = 0xff, /* There was one error.
Previously was represented by -1
This is not a command */
};
#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 = LM832x_GENERAL_ERROR;
break;
case LM832x_CMD_RESET:
if (value == 0xaa)
lm_kbd_reset(s);
else
lm_kbd_error(s, ERR_BADPAR);
s->reg = LM832x_GENERAL_ERROR;
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 = LM832x_GENERAL_ERROR;
}
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 = LM832x_GENERAL_ERROR;
}
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 = LM832x_GENERAL_ERROR;
}
break;
case LM832x_CMD_SET_ACTIVE:
s->acttime = value;
s->reg = LM832x_GENERAL_ERROR;
break;
case LM832x_CMD_SET_DEBOUNCE:
s->kbd.dbnctime = value;
s->reg = LM832x_GENERAL_ERROR;
if (!value)
lm_kbd_error(s, ERR_BADPAR);
break;
case LM832x_CMD_SET_KEY_SIZE:
s->kbd.size = value;
s->reg = LM832x_GENERAL_ERROR;
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 = LM832x_GENERAL_ERROR;
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 = LM832x_GENERAL_ERROR;
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 = LM832x_GENERAL_ERROR;
}
break;
case LM832x_CMD_PWM_START:
s->reg = LM832x_GENERAL_ERROR;
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 = LM832x_GENERAL_ERROR;
if (!(value & 3)) {
lm_kbd_error(s, ERR_BADPAR);
break;
}
qemu_del_timer(s->pwm.tm[(value & 3) - 1]);
break;
case LM832x_GENERAL_ERROR:
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(I2CSlave *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(I2CSlave *i2c)
{
LM823KbdState *s = FROM_I2C_SLAVE(LM823KbdState, i2c);
return lm_kbd_read(s, s->reg, s->i2c_cycle ++);
}
static int lm_i2c_tx(I2CSlave *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 int lm_kbd_post_load(void *opaque, int version_id)
{
LM823KbdState *s = opaque;
lm_kbd_irq_update(s);
lm_kbd_gpio_update(s);
return 0;
}
static const VMStateDescription vmstate_lm_kbd = {
.name = "LM8323",
.version_id = 0,
.minimum_version_id = 0,
.minimum_version_id_old = 0,
.post_load = lm_kbd_post_load,
.fields = (VMStateField []) {
VMSTATE_I2C_SLAVE(i2c, LM823KbdState),
VMSTATE_UINT8(i2c_dir, LM823KbdState),
VMSTATE_UINT8(i2c_cycle, LM823KbdState),
VMSTATE_UINT8(reg, LM823KbdState),
VMSTATE_UINT8(config, LM823KbdState),
VMSTATE_UINT8(status, LM823KbdState),
VMSTATE_UINT8(acttime, LM823KbdState),
VMSTATE_UINT8(error, LM823KbdState),
VMSTATE_UINT8(clock, LM823KbdState),
VMSTATE_UINT16(gpio.pull, LM823KbdState),
VMSTATE_UINT16(gpio.mask, LM823KbdState),
VMSTATE_UINT16(gpio.dir, LM823KbdState),
VMSTATE_UINT16(gpio.level, LM823KbdState),
VMSTATE_UINT8(kbd.dbnctime, LM823KbdState),
VMSTATE_UINT8(kbd.size, LM823KbdState),
VMSTATE_UINT8(kbd.start, LM823KbdState),
VMSTATE_UINT8(kbd.len, LM823KbdState),
VMSTATE_BUFFER(kbd.fifo, LM823KbdState),
VMSTATE_UINT16_ARRAY(pwm.file, LM823KbdState, 256),
VMSTATE_UINT8(pwm.faddr, LM823KbdState),
VMSTATE_BUFFER(pwm.addr, LM823KbdState),
VMSTATE_TIMER_ARRAY(pwm.tm, LM823KbdState, 3),
VMSTATE_END_OF_LIST()
}
};
static int lm8323_init(I2CSlave *i2c)
{
LM823KbdState *s = FROM_I2C_SLAVE(LM823KbdState, i2c);
s->model = 0x8323;
s->pwm.tm[0] = qemu_new_timer_ns(vm_clock, lm_kbd_pwm0_tick, s);
s->pwm.tm[1] = qemu_new_timer_ns(vm_clock, lm_kbd_pwm1_tick, s);
s->pwm.tm[2] = qemu_new_timer_ns(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, s);
return 0;
}
void lm832x_key_event(DeviceState *dev, int key, int state)
{
LM823KbdState *s = FROM_I2C_SLAVE(LM823KbdState, I2C_SLAVE(dev));
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 void lm8323_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
k->init = lm8323_init;
k->event = lm_i2c_event;
k->recv = lm_i2c_rx;
k->send = lm_i2c_tx;
dc->vmsd = &vmstate_lm_kbd;
}
static const TypeInfo lm8323_info = {
.name = "lm8323",
.parent = TYPE_I2C_SLAVE,
.instance_size = sizeof(LM823KbdState),
.class_init = lm8323_class_init,
};
static void lm832x_register_types(void)
{
type_register_static(&lm8323_info);
}
type_init(lm832x_register_types)
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