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qemu/hw/arm/z2.c
Corey Minyard 2ac4c5f4d2 i2c: have I2C receive operation return uint8_t 
It is never supposed to fail and cannot return an error, so just
have it return the proper type.  Have it return 0xff on nothing
available, since that's what would happen on a real bus.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
2019-02-27 21:06:08 -06:00

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/*
* PXA270-based Zipit Z2 device
*
* Copyright (c) 2011 by Vasily Khoruzhick <anarsoul@gmail.com>
*
* Code is based on mainstone platform.
*
* This code is licensed under the GNU GPL v2.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "hw/hw.h"
#include "hw/arm/pxa.h"
#include "hw/arm/arm.h"
#include "hw/devices.h"
#include "hw/i2c/i2c.h"
#include "hw/ssi/ssi.h"
#include "hw/boards.h"
#include "sysemu/sysemu.h"
#include "hw/block/flash.h"
#include "ui/console.h"
#include "hw/audio/wm8750.h"
#include "audio/audio.h"
#include "exec/address-spaces.h"
#include "sysemu/qtest.h"
#include "cpu.h"
#ifdef DEBUG_Z2
#define DPRINTF(fmt, ...) \
printf(fmt, ## __VA_ARGS__)
#else
#define DPRINTF(fmt, ...)
#endif
static const struct keymap map[0x100] = {
[0 ... 0xff] = { -1, -1 },
[0x3b] = {0, 0}, /* Option = F1 */
[0xc8] = {0, 1}, /* Up */
[0xd0] = {0, 2}, /* Down */
[0xcb] = {0, 3}, /* Left */
[0xcd] = {0, 4}, /* Right */
[0xcf] = {0, 5}, /* End */
[0x0d] = {0, 6}, /* KPPLUS */
[0xc7] = {1, 0}, /* Home */
[0x10] = {1, 1}, /* Q */
[0x17] = {1, 2}, /* I */
[0x22] = {1, 3}, /* G */
[0x2d] = {1, 4}, /* X */
[0x1c] = {1, 5}, /* Enter */
[0x0c] = {1, 6}, /* KPMINUS */
[0xc9] = {2, 0}, /* PageUp */
[0x11] = {2, 1}, /* W */
[0x18] = {2, 2}, /* O */
[0x23] = {2, 3}, /* H */
[0x2e] = {2, 4}, /* C */
[0x38] = {2, 5}, /* LeftAlt */
[0xd1] = {3, 0}, /* PageDown */
[0x12] = {3, 1}, /* E */
[0x19] = {3, 2}, /* P */
[0x24] = {3, 3}, /* J */
[0x2f] = {3, 4}, /* V */
[0x2a] = {3, 5}, /* LeftShift */
[0x01] = {4, 0}, /* Esc */
[0x13] = {4, 1}, /* R */
[0x1e] = {4, 2}, /* A */
[0x25] = {4, 3}, /* K */
[0x30] = {4, 4}, /* B */
[0x1d] = {4, 5}, /* LeftCtrl */
[0x0f] = {5, 0}, /* Tab */
[0x14] = {5, 1}, /* T */
[0x1f] = {5, 2}, /* S */
[0x26] = {5, 3}, /* L */
[0x31] = {5, 4}, /* N */
[0x39] = {5, 5}, /* Space */
[0x3c] = {6, 0}, /* Stop = F2 */
[0x15] = {6, 1}, /* Y */
[0x20] = {6, 2}, /* D */
[0x0e] = {6, 3}, /* Backspace */
[0x32] = {6, 4}, /* M */
[0x33] = {6, 5}, /* Comma */
[0x3d] = {7, 0}, /* Play = F3 */
[0x16] = {7, 1}, /* U */
[0x21] = {7, 2}, /* F */
[0x2c] = {7, 3}, /* Z */
[0x27] = {7, 4}, /* Semicolon */
[0x34] = {7, 5}, /* Dot */
};
#define Z2_RAM_SIZE 0x02000000
#define Z2_FLASH_BASE 0x00000000
#define Z2_FLASH_SIZE 0x00800000
static struct arm_boot_info z2_binfo = {
.loader_start = PXA2XX_SDRAM_BASE,
.ram_size = Z2_RAM_SIZE,
};
#define Z2_GPIO_SD_DETECT 96
#define Z2_GPIO_AC_IN 0
#define Z2_GPIO_KEY_ON 1
#define Z2_GPIO_LCD_CS 88
typedef struct {
SSISlave ssidev;
int32_t selected;
int32_t enabled;
uint8_t buf[3];
uint32_t cur_reg;
int pos;
} ZipitLCD;
static uint32_t zipit_lcd_transfer(SSISlave *dev, uint32_t value)
{
ZipitLCD *z = FROM_SSI_SLAVE(ZipitLCD, dev);
uint16_t val;
if (z->selected) {
z->buf[z->pos] = value & 0xff;
z->pos++;
}
if (z->pos == 3) {
switch (z->buf[0]) {
case 0x74:
DPRINTF("%s: reg: 0x%.2x\n", __func__, z->buf[2]);
z->cur_reg = z->buf[2];
break;
case 0x76:
val = z->buf[1] << 8 | z->buf[2];
DPRINTF("%s: value: 0x%.4x\n", __func__, val);
if (z->cur_reg == 0x22 && val == 0x0000) {
z->enabled = 1;
printf("%s: LCD enabled\n", __func__);
} else if (z->cur_reg == 0x10 && val == 0x0000) {
z->enabled = 0;
printf("%s: LCD disabled\n", __func__);
}
break;
default:
DPRINTF("%s: unknown command!\n", __func__);
break;
}
z->pos = 0;
}
return 0;
}
static void z2_lcd_cs(void *opaque, int line, int level)
{
ZipitLCD *z2_lcd = opaque;
z2_lcd->selected = !level;
}
static void zipit_lcd_realize(SSISlave *dev, Error **errp)
{
ZipitLCD *z = FROM_SSI_SLAVE(ZipitLCD, dev);
z->selected = 0;
z->enabled = 0;
z->pos = 0;
}
static VMStateDescription vmstate_zipit_lcd_state = {
.name = "zipit-lcd",
.version_id = 2,
.minimum_version_id = 2,
.fields = (VMStateField[]) {
VMSTATE_SSI_SLAVE(ssidev, ZipitLCD),
VMSTATE_INT32(selected, ZipitLCD),
VMSTATE_INT32(enabled, ZipitLCD),
VMSTATE_BUFFER(buf, ZipitLCD),
VMSTATE_UINT32(cur_reg, ZipitLCD),
VMSTATE_INT32(pos, ZipitLCD),
VMSTATE_END_OF_LIST(),
}
};
static void zipit_lcd_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
k->realize = zipit_lcd_realize;
k->transfer = zipit_lcd_transfer;
dc->vmsd = &vmstate_zipit_lcd_state;
}
static const TypeInfo zipit_lcd_info = {
.name = "zipit-lcd",
.parent = TYPE_SSI_SLAVE,
.instance_size = sizeof(ZipitLCD),
.class_init = zipit_lcd_class_init,
};
#define TYPE_AER915 "aer915"
#define AER915(obj) OBJECT_CHECK(AER915State, (obj), TYPE_AER915)
typedef struct AER915State {
I2CSlave parent_obj;
int len;
uint8_t buf[3];
} AER915State;
static int aer915_send(I2CSlave *i2c, uint8_t data)
{
AER915State *s = AER915(i2c);
s->buf[s->len] = data;
if (s->len++ > 2) {
DPRINTF("%s: message too long (%i bytes)\n",
__func__, s->len);
return 1;
}
if (s->len == 2) {
DPRINTF("%s: reg %d value 0x%02x\n", __func__,
s->buf[0], s->buf[1]);
}
return 0;
}
static int aer915_event(I2CSlave *i2c, enum i2c_event event)
{
AER915State *s = AER915(i2c);
switch (event) {
case I2C_START_SEND:
s->len = 0;
break;
case I2C_START_RECV:
if (s->len != 1) {
DPRINTF("%s: short message!?\n", __func__);
}
break;
case I2C_FINISH:
break;
default:
break;
}
return 0;
}
static uint8_t aer915_recv(I2CSlave *slave)
{
AER915State *s = AER915(slave);
int retval = 0x00;
switch (s->buf[0]) {
/* Return hardcoded battery voltage,
* 0xf0 means ~4.1V
*/
case 0x02:
retval = 0xf0;
break;
/* Return 0x00 for other regs,
* we don't know what they are for,
* anyway they return 0x00 on real hardware.
*/
default:
break;
}
return retval;
}
static VMStateDescription vmstate_aer915_state = {
.name = "aer915",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_INT32(len, AER915State),
VMSTATE_BUFFER(buf, AER915State),
VMSTATE_END_OF_LIST(),
}
};
static void aer915_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
k->event = aer915_event;
k->recv = aer915_recv;
k->send = aer915_send;
dc->vmsd = &vmstate_aer915_state;
}
static const TypeInfo aer915_info = {
.name = TYPE_AER915,
.parent = TYPE_I2C_SLAVE,
.instance_size = sizeof(AER915State),
.class_init = aer915_class_init,
};
static void z2_init(MachineState *machine)
{
const char *kernel_filename = machine->kernel_filename;
const char *kernel_cmdline = machine->kernel_cmdline;
const char *initrd_filename = machine->initrd_filename;
MemoryRegion *address_space_mem = get_system_memory();
uint32_t sector_len = 0x10000;
PXA2xxState *mpu;
DriveInfo *dinfo;
int be;
void *z2_lcd;
I2CBus *bus;
DeviceState *wm;
/* Setup CPU & memory */
mpu = pxa270_init(address_space_mem, z2_binfo.ram_size, machine->cpu_type);
#ifdef TARGET_WORDS_BIGENDIAN
be = 1;
#else
be = 0;
#endif
dinfo = drive_get(IF_PFLASH, 0, 0);
if (!dinfo && !qtest_enabled()) {
error_report("Flash image must be given with the "
"'pflash' parameter");
exit(1);
}
if (!pflash_cfi01_register(Z2_FLASH_BASE,
NULL, "z2.flash0", Z2_FLASH_SIZE,
dinfo ? blk_by_legacy_dinfo(dinfo) : NULL,
sector_len, Z2_FLASH_SIZE / sector_len,
4, 0, 0, 0, 0, be)) {
error_report("Error registering flash memory");
exit(1);
}
/* setup keypad */
pxa27x_register_keypad(mpu->kp, map, 0x100);
/* MMC/SD host */
pxa2xx_mmci_handlers(mpu->mmc,
NULL,
qdev_get_gpio_in(mpu->gpio, Z2_GPIO_SD_DETECT));
type_register_static(&zipit_lcd_info);
type_register_static(&aer915_info);
z2_lcd = ssi_create_slave(mpu->ssp[1], "zipit-lcd");
bus = pxa2xx_i2c_bus(mpu->i2c[0]);
i2c_create_slave(bus, TYPE_AER915, 0x55);
wm = i2c_create_slave(bus, TYPE_WM8750, 0x1b);
mpu->i2s->opaque = wm;
mpu->i2s->codec_out = wm8750_dac_dat;
mpu->i2s->codec_in = wm8750_adc_dat;
wm8750_data_req_set(wm, mpu->i2s->data_req, mpu->i2s);
qdev_connect_gpio_out(mpu->gpio, Z2_GPIO_LCD_CS,
qemu_allocate_irq(z2_lcd_cs, z2_lcd, 0));
z2_binfo.kernel_filename = kernel_filename;
z2_binfo.kernel_cmdline = kernel_cmdline;
z2_binfo.initrd_filename = initrd_filename;
z2_binfo.board_id = 0x6dd;
arm_load_kernel(mpu->cpu, &z2_binfo);
}
static void z2_machine_init(MachineClass *mc)
{
mc->desc = "Zipit Z2 (PXA27x)";
mc->init = z2_init;
mc->ignore_memory_transaction_failures = true;
mc->default_cpu_type = ARM_CPU_TYPE_NAME("pxa270-c5");
}
DEFINE_MACHINE("z2", z2_machine_init)
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