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qemu-e2k/hw/i2c/mpc_i2c.c
Philippe Mathieu-Daudé 8e5c952b37 hw: Remove unnecessary DEVICE() cast 
The DEVICE() macro is defined as:

  #define DEVICE(obj) OBJECT_CHECK(DeviceState, (obj), TYPE_DEVICE)

which expands to:

  ((DeviceState *)object_dynamic_cast_assert((Object *)(obj), (name),
                                             __FILE__, __LINE__,
                                             __func__))

This assertion can only fail when @obj points to something other
than its stated type, i.e. when we're in undefined behavior country.

Remove the unnecessary DEVICE() casts when we already know the
pointer is of DeviceState type.

Patch created mechanically using spatch with this script:

  @@
  typedef DeviceState;
  DeviceState *s;
  @@
  -   DEVICE(s)
  +   s

Acked-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Paul Durrant <paul@xen.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: John Snow <jsnow@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20200512070020.22782-4-f4bug@amsat.org>
2020-05-15 07:08:52 +02:00

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/*
* Copyright (C) 2014 Freescale Semiconductor, Inc. All rights reserved.
*
* Author: Amit Tomar, <Amit.Tomar@freescale.com>
*
* Description:
* This file is derived from IMX I2C controller,
* by Jean-Christophe DUBOIS .
*
* Thanks to Scott Wood and Alexander Graf for their kind help on this.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2 or later,
* as published by the Free Software Foundation.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "hw/i2c/i2c.h"
#include "hw/irq.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
/* #define DEBUG_I2C */
#ifdef DEBUG_I2C
#define DPRINTF(fmt, ...) \
do { fprintf(stderr, "mpc_i2c[%s]: " fmt, __func__, ## __VA_ARGS__); \
} while (0)
#else
#define DPRINTF(fmt, ...) do {} while (0)
#endif
#define TYPE_MPC_I2C "mpc-i2c"
#define MPC_I2C(obj) \
OBJECT_CHECK(MPCI2CState, (obj), TYPE_MPC_I2C)
#define MPC_I2C_ADR 0x00
#define MPC_I2C_FDR 0x04
#define MPC_I2C_CR 0x08
#define MPC_I2C_SR 0x0c
#define MPC_I2C_DR 0x10
#define MPC_I2C_DFSRR 0x14
#define CCR_MEN (1 << 7)
#define CCR_MIEN (1 << 6)
#define CCR_MSTA (1 << 5)
#define CCR_MTX (1 << 4)
#define CCR_TXAK (1 << 3)
#define CCR_RSTA (1 << 2)
#define CCR_BCST (1 << 0)
#define CSR_MCF (1 << 7)
#define CSR_MAAS (1 << 6)
#define CSR_MBB (1 << 5)
#define CSR_MAL (1 << 4)
#define CSR_SRW (1 << 2)
#define CSR_MIF (1 << 1)
#define CSR_RXAK (1 << 0)
#define CADR_MASK 0xFE
#define CFDR_MASK 0x3F
#define CCR_MASK 0xFC
#define CSR_MASK 0xED
#define CDR_MASK 0xFF
#define CYCLE_RESET 0xFF
typedef struct MPCI2CState {
SysBusDevice parent_obj;
I2CBus *bus;
qemu_irq irq;
MemoryRegion iomem;
uint8_t address;
uint8_t adr;
uint8_t fdr;
uint8_t cr;
uint8_t sr;
uint8_t dr;
uint8_t dfssr;
} MPCI2CState;
static bool mpc_i2c_is_enabled(MPCI2CState *s)
{
return s->cr & CCR_MEN;
}
static bool mpc_i2c_is_master(MPCI2CState *s)
{
return s->cr & CCR_MSTA;
}
static bool mpc_i2c_direction_is_tx(MPCI2CState *s)
{
return s->cr & CCR_MTX;
}
static bool mpc_i2c_irq_pending(MPCI2CState *s)
{
return s->sr & CSR_MIF;
}
static bool mpc_i2c_irq_is_enabled(MPCI2CState *s)
{
return s->cr & CCR_MIEN;
}
static void mpc_i2c_reset(DeviceState *dev)
{
MPCI2CState *i2c = MPC_I2C(dev);
i2c->address = 0xFF;
i2c->adr = 0x00;
i2c->fdr = 0x00;
i2c->cr = 0x00;
i2c->sr = 0x81;
i2c->dr = 0x00;
}
static void mpc_i2c_irq(MPCI2CState *s)
{
bool irq_active = false;
if (mpc_i2c_is_enabled(s) && mpc_i2c_irq_is_enabled(s)
&& mpc_i2c_irq_pending(s)) {
irq_active = true;
}
if (irq_active) {
qemu_irq_raise(s->irq);
} else {
qemu_irq_lower(s->irq);
}
}
static void mpc_i2c_soft_reset(MPCI2CState *s)
{
/* This is a soft reset. ADR is preserved during soft resets */
uint8_t adr = s->adr;
mpc_i2c_reset(DEVICE(s));
s->adr = adr;
}
static void mpc_i2c_address_send(MPCI2CState *s)
{
/* if returns non zero slave address is not right */
if (i2c_start_transfer(s->bus, s->dr >> 1, s->dr & (0x01))) {
s->sr |= CSR_RXAK;
} else {
s->address = s->dr;
s->sr &= ~CSR_RXAK;
s->sr |= CSR_MCF; /* Set after Byte Transfer is completed */
s->sr |= CSR_MIF; /* Set after Byte Transfer is completed */
mpc_i2c_irq(s);
}
}
static void mpc_i2c_data_send(MPCI2CState *s)
{
if (i2c_send(s->bus, s->dr)) {
/* End of transfer */
s->sr |= CSR_RXAK;
i2c_end_transfer(s->bus);
} else {
s->sr &= ~CSR_RXAK;
s->sr |= CSR_MCF; /* Set after Byte Transfer is completed */
s->sr |= CSR_MIF; /* Set after Byte Transfer is completed */
mpc_i2c_irq(s);
}
}
static void mpc_i2c_data_recive(MPCI2CState *s)
{
int ret;
/* get the next byte */
ret = i2c_recv(s->bus);
if (ret >= 0) {
s->sr |= CSR_MCF; /* Set after Byte Transfer is completed */
s->sr |= CSR_MIF; /* Set after Byte Transfer is completed */
mpc_i2c_irq(s);
} else {
DPRINTF("read failed for device");
ret = 0xff;
}
s->dr = ret;
}
static uint64_t mpc_i2c_read(void *opaque, hwaddr addr, unsigned size)
{
MPCI2CState *s = opaque;
uint8_t value;
switch (addr) {
case MPC_I2C_ADR:
value = s->adr;
break;
case MPC_I2C_FDR:
value = s->fdr;
break;
case MPC_I2C_CR:
value = s->cr;
break;
case MPC_I2C_SR:
value = s->sr;
break;
case MPC_I2C_DR:
value = s->dr;
if (mpc_i2c_is_master(s)) { /* master mode */
if (mpc_i2c_direction_is_tx(s)) {
DPRINTF("MTX is set not in recv mode\n");
} else {
mpc_i2c_data_recive(s);
}
}
break;
default:
value = 0;
DPRINTF("ERROR: Bad read addr 0x%x\n", (unsigned int)addr);
break;
}
DPRINTF("%s: addr " TARGET_FMT_plx " %02" PRIx32 "\n", __func__,
addr, value);
return (uint64_t)value;
}
static void mpc_i2c_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
MPCI2CState *s = opaque;
DPRINTF("%s: addr " TARGET_FMT_plx " val %08" PRIx64 "\n", __func__,
addr, value);
switch (addr) {
case MPC_I2C_ADR:
s->adr = value & CADR_MASK;
break;
case MPC_I2C_FDR:
s->fdr = value & CFDR_MASK;
break;
case MPC_I2C_CR:
if (mpc_i2c_is_enabled(s) && ((value & CCR_MEN) == 0)) {
mpc_i2c_soft_reset(s);
break;
}
/* normal write */
s->cr = value & CCR_MASK;
if (mpc_i2c_is_master(s)) { /* master mode */
/* set the bus to busy after master is set as per RM */
s->sr |= CSR_MBB;
} else {
/* bus is not busy anymore */
s->sr &= ~CSR_MBB;
/* Reset the address for fresh write/read cycle */
if (s->address != CYCLE_RESET) {
i2c_end_transfer(s->bus);
s->address = CYCLE_RESET;
}
}
/* For restart end the onging transfer */
if (s->cr & CCR_RSTA) {
if (s->address != CYCLE_RESET) {
s->address = CYCLE_RESET;
i2c_end_transfer(s->bus);
s->cr &= ~CCR_RSTA;
}
}
break;
case MPC_I2C_SR:
s->sr = value & CSR_MASK;
/* Lower the interrupt */
if (!(s->sr & CSR_MIF) || !(s->sr & CSR_MAL)) {
mpc_i2c_irq(s);
}
break;
case MPC_I2C_DR:
/* if the device is not enabled, nothing to do */
if (!mpc_i2c_is_enabled(s)) {
break;
}
s->dr = value & CDR_MASK;
if (mpc_i2c_is_master(s)) { /* master mode */
if (s->address == CYCLE_RESET) {
mpc_i2c_address_send(s);
} else {
mpc_i2c_data_send(s);
}
}
break;
case MPC_I2C_DFSRR:
s->dfssr = value;
break;
default:
DPRINTF("ERROR: Bad write addr 0x%x\n", (unsigned int)addr);
break;
}
}
static const MemoryRegionOps i2c_ops = {
.read = mpc_i2c_read,
.write = mpc_i2c_write,
.valid.max_access_size = 1,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static const VMStateDescription mpc_i2c_vmstate = {
.name = TYPE_MPC_I2C,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT8(address, MPCI2CState),
VMSTATE_UINT8(adr, MPCI2CState),
VMSTATE_UINT8(fdr, MPCI2CState),
VMSTATE_UINT8(cr, MPCI2CState),
VMSTATE_UINT8(sr, MPCI2CState),
VMSTATE_UINT8(dr, MPCI2CState),
VMSTATE_UINT8(dfssr, MPCI2CState),
VMSTATE_END_OF_LIST()
}
};
static void mpc_i2c_realize(DeviceState *dev, Error **errp)
{
MPCI2CState *i2c = MPC_I2C(dev);
sysbus_init_irq(SYS_BUS_DEVICE(dev), &i2c->irq);
memory_region_init_io(&i2c->iomem, OBJECT(i2c), &i2c_ops, i2c,
"mpc-i2c", 0x14);
sysbus_init_mmio(SYS_BUS_DEVICE(dev), &i2c->iomem);
i2c->bus = i2c_init_bus(dev, "i2c");
}
static void mpc_i2c_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->vmsd = &mpc_i2c_vmstate ;
dc->reset = mpc_i2c_reset;
dc->realize = mpc_i2c_realize;
dc->desc = "MPC I2C Controller";
}
static const TypeInfo mpc_i2c_type_info = {
.name = TYPE_MPC_I2C,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(MPCI2CState),
.class_init = mpc_i2c_class_init,
};
static void mpc_i2c_register_types(void)
{
type_register_static(&mpc_i2c_type_info);
}
type_init(mpc_i2c_register_types)
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