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qemu-e2k/hw/hppa/dino.c
Laurent Vivier 4a4ff4c58f Remove unnecessary variables for function return value 
Re-run Coccinelle script scripts/coccinelle/return_directly.cocci

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
ppc part
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2018-05-20 08:48:13 +03:00

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/*
* HP-PARISC Dino PCI chipset emulation.
*
* (C) 2017 by Helge Deller <deller@gmx.de>
*
* This work is licensed under the GNU GPL license version 2 or later.
*
* Documentation available at:
* https://parisc.wiki.kernel.org/images-parisc/9/91/Dino_ers.pdf
* https://parisc.wiki.kernel.org/images-parisc/7/70/Dino_3_1_Errata.pdf
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "cpu.h"
#include "hw/hw.h"
#include "hw/devices.h"
#include "sysemu/sysemu.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_bus.h"
#include "hppa_sys.h"
#include "exec/address-spaces.h"
#define TYPE_DINO_PCI_HOST_BRIDGE "dino-pcihost"
#define DINO_IAR0 0x004
#define DINO_IODC 0x008
#define DINO_IRR0 0x00C /* RO */
#define DINO_IAR1 0x010
#define DINO_IRR1 0x014 /* RO */
#define DINO_IMR 0x018
#define DINO_IPR 0x01C
#define DINO_TOC_ADDR 0x020
#define DINO_ICR 0x024
#define DINO_ILR 0x028 /* RO */
#define DINO_IO_COMMAND 0x030 /* WO */
#define DINO_IO_STATUS 0x034 /* RO */
#define DINO_IO_CONTROL 0x038
#define DINO_IO_GSC_ERR_RESP 0x040 /* RO */
#define DINO_IO_ERR_INFO 0x044 /* RO */
#define DINO_IO_PCI_ERR_RESP 0x048 /* RO */
#define DINO_IO_FBB_EN 0x05c
#define DINO_IO_ADDR_EN 0x060
#define DINO_PCI_CONFIG_ADDR 0x064
#define DINO_PCI_CONFIG_DATA 0x068
#define DINO_PCI_IO_DATA 0x06c
#define DINO_PCI_MEM_DATA 0x070 /* Dino 3.x only */
#define DINO_GSC2X_CONFIG 0x7b4 /* RO */
#define DINO_GMASK 0x800
#define DINO_PAMR 0x804
#define DINO_PAPR 0x808
#define DINO_DAMODE 0x80c
#define DINO_PCICMD 0x810
#define DINO_PCISTS 0x814 /* R/WC */
#define DINO_MLTIM 0x81c
#define DINO_BRDG_FEAT 0x820
#define DINO_PCIROR 0x824
#define DINO_PCIWOR 0x828
#define DINO_TLTIM 0x830
#define DINO_IRQS 11 /* bits 0-10 are architected */
#define DINO_IRR_MASK 0x5ff /* only 10 bits are implemented */
#define DINO_LOCAL_IRQS (DINO_IRQS + 1)
#define DINO_MASK_IRQ(x) (1 << (x))
#define PCIINTA 0x001
#define PCIINTB 0x002
#define PCIINTC 0x004
#define PCIINTD 0x008
#define PCIINTE 0x010
#define PCIINTF 0x020
#define GSCEXTINT 0x040
/* #define xxx 0x080 - bit 7 is "default" */
/* #define xxx 0x100 - bit 8 not used */
/* #define xxx 0x200 - bit 9 not used */
#define RS232INT 0x400
#define DINO_MEM_CHUNK_SIZE (8 * 1024 * 1024) /* 8MB */
#define DINO_PCI_HOST_BRIDGE(obj) \
OBJECT_CHECK(DinoState, (obj), TYPE_DINO_PCI_HOST_BRIDGE)
typedef struct DinoState {
PCIHostState parent_obj;
/* PCI_CONFIG_ADDR is parent_obj.config_reg, via pci_host_conf_be_ops,
so that we can map PCI_CONFIG_DATA to pci_host_data_be_ops. */
uint32_t iar0;
uint32_t iar1;
uint32_t imr;
uint32_t ipr;
uint32_t icr;
uint32_t ilr;
uint32_t io_addr_en;
uint32_t io_control;
MemoryRegion this_mem;
MemoryRegion pci_mem;
MemoryRegion pci_mem_alias[32];
AddressSpace bm_as;
MemoryRegion bm;
MemoryRegion bm_ram_alias;
MemoryRegion bm_pci_alias;
MemoryRegion cpu0_eir_mem;
} DinoState;
/*
* Dino can forward memory accesses from the CPU in the range between
* 0xf0800000 and 0xff000000 to the PCI bus.
*/
static void gsc_to_pci_forwarding(DinoState *s)
{
uint32_t io_addr_en, tmp;
int enabled, i;
tmp = extract32(s->io_control, 7, 2);
enabled = (tmp == 0x01);
io_addr_en = s->io_addr_en;
memory_region_transaction_begin();
for (i = 1; i < 31; i++) {
MemoryRegion *mem = &s->pci_mem_alias[i];
if (enabled && (io_addr_en & (1U << i))) {
if (!memory_region_is_mapped(mem)) {
uint32_t addr = 0xf0000000 + i * DINO_MEM_CHUNK_SIZE;
memory_region_add_subregion(get_system_memory(), addr, mem);
}
} else if (memory_region_is_mapped(mem)) {
memory_region_del_subregion(get_system_memory(), mem);
}
}
memory_region_transaction_commit();
}
static bool dino_chip_mem_valid(void *opaque, hwaddr addr,
unsigned size, bool is_write)
{
switch (addr) {
case DINO_IAR0:
case DINO_IAR1:
case DINO_IRR0:
case DINO_IRR1:
case DINO_IMR:
case DINO_IPR:
case DINO_ICR:
case DINO_ILR:
case DINO_IO_CONTROL:
case DINO_IO_ADDR_EN:
case DINO_PCI_IO_DATA:
return true;
case DINO_PCI_IO_DATA + 2:
return size <= 2;
case DINO_PCI_IO_DATA + 1:
case DINO_PCI_IO_DATA + 3:
return size == 1;
}
return false;
}
static MemTxResult dino_chip_read_with_attrs(void *opaque, hwaddr addr,
uint64_t *data, unsigned size,
MemTxAttrs attrs)
{
DinoState *s = opaque;
MemTxResult ret = MEMTX_OK;
AddressSpace *io;
uint16_t ioaddr;
uint32_t val;
switch (addr) {
case DINO_PCI_IO_DATA ... DINO_PCI_IO_DATA + 3:
/* Read from PCI IO space. */
io = &address_space_io;
ioaddr = s->parent_obj.config_reg;
switch (size) {
case 1:
val = address_space_ldub(io, ioaddr, attrs, &ret);
break;
case 2:
val = address_space_lduw_be(io, ioaddr, attrs, &ret);
break;
case 4:
val = address_space_ldl_be(io, ioaddr, attrs, &ret);
break;
default:
g_assert_not_reached();
}
break;
case DINO_IO_ADDR_EN:
val = s->io_addr_en;
break;
case DINO_IO_CONTROL:
val = s->io_control;
break;
case DINO_IAR0:
val = s->iar0;
break;
case DINO_IAR1:
val = s->iar1;
break;
case DINO_IMR:
val = s->imr;
break;
case DINO_ICR:
val = s->icr;
break;
case DINO_IPR:
val = s->ipr;
/* Any read to IPR clears the register. */
s->ipr = 0;
break;
case DINO_ILR:
val = s->ilr;
break;
case DINO_IRR0:
val = s->ilr & s->imr & ~s->icr;
break;
case DINO_IRR1:
val = s->ilr & s->imr & s->icr;
break;
default:
/* Controlled by dino_chip_mem_valid above. */
g_assert_not_reached();
}
*data = val;
return ret;
}
static MemTxResult dino_chip_write_with_attrs(void *opaque, hwaddr addr,
uint64_t val, unsigned size,
MemTxAttrs attrs)
{
DinoState *s = opaque;
AddressSpace *io;
MemTxResult ret;
uint16_t ioaddr;
switch (addr) {
case DINO_IO_DATA ... DINO_PCI_IO_DATA + 3:
/* Write into PCI IO space. */
io = &address_space_io;
ioaddr = s->parent_obj.config_reg;
switch (size) {
case 1:
address_space_stb(io, ioaddr, val, attrs, &ret);
break;
case 2:
address_space_stw_be(io, ioaddr, val, attrs, &ret);
break;
case 4:
address_space_stl_be(io, ioaddr, val, attrs, &ret);
break;
default:
g_assert_not_reached();
}
return ret;
case DINO_IO_ADDR_EN:
/* Never allow first (=firmware) and last (=Dino) areas. */
s->io_addr_en = val & 0x7ffffffe;
gsc_to_pci_forwarding(s);
break;
case DINO_IO_CONTROL:
s->io_control = val;
gsc_to_pci_forwarding(s);
break;
case DINO_IAR0:
s->iar0 = val;
break;
case DINO_IAR1:
s->iar1 = val;
break;
case DINO_IMR:
s->imr = val;
break;
case DINO_ICR:
s->icr = val;
break;
case DINO_IPR:
/* Any write to IPR clears the register. */
s->ipr = 0;
break;
case DINO_ILR:
case DINO_IRR0:
case DINO_IRR1:
/* These registers are read-only. */
break;
default:
/* Controlled by dino_chip_mem_valid above. */
g_assert_not_reached();
}
return MEMTX_OK;
}
static const MemoryRegionOps dino_chip_ops = {
.read_with_attrs = dino_chip_read_with_attrs,
.write_with_attrs = dino_chip_write_with_attrs,
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
.accepts = dino_chip_mem_valid,
},
.impl = {
.min_access_size = 1,
.max_access_size = 4,
},
};
static const VMStateDescription vmstate_dino = {
.name = "Dino",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(iar0, DinoState),
VMSTATE_UINT32(iar1, DinoState),
VMSTATE_UINT32(imr, DinoState),
VMSTATE_UINT32(ipr, DinoState),
VMSTATE_UINT32(icr, DinoState),
VMSTATE_UINT32(ilr, DinoState),
VMSTATE_UINT32(io_addr_en, DinoState),
VMSTATE_UINT32(io_control, DinoState),
VMSTATE_END_OF_LIST()
}
};
/* Unlike pci_config_data_le_ops, no check of high bit set in config_reg. */
static uint64_t dino_config_data_read(void *opaque, hwaddr addr, unsigned len)
{
PCIHostState *s = opaque;
return pci_data_read(s->bus, s->config_reg | (addr & 3), len);
}
static void dino_config_data_write(void *opaque, hwaddr addr,
uint64_t val, unsigned len)
{
PCIHostState *s = opaque;
pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
}
static const MemoryRegionOps dino_config_data_ops = {
.read = dino_config_data_read,
.write = dino_config_data_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static AddressSpace *dino_pcihost_set_iommu(PCIBus *bus, void *opaque,
int devfn)
{
DinoState *s = opaque;
return &s->bm_as;
}
/*
* Dino interrupts are connected as shown on Page 78, Table 23
* (Little-endian bit numbers)
* 0 PCI INTA
* 1 PCI INTB
* 2 PCI INTC
* 3 PCI INTD
* 4 PCI INTE
* 5 PCI INTF
* 6 GSC External Interrupt
* 7 Bus Error for "less than fatal" mode
* 8 PS2
* 9 Unused
* 10 RS232
*/
static void dino_set_irq(void *opaque, int irq, int level)
{
DinoState *s = opaque;
uint32_t bit = 1u << irq;
uint32_t old_ilr = s->ilr;
if (level) {
uint32_t ena = bit & ~old_ilr;
s->ipr |= ena;
s->ilr = old_ilr | bit;
if (ena & s->imr) {
uint32_t iar = (ena & s->icr ? s->iar1 : s->iar0);
stl_be_phys(&address_space_memory, iar & -32, iar & 31);
}
} else {
s->ilr = old_ilr & ~bit;
}
}
static int dino_pci_map_irq(PCIDevice *d, int irq_num)
{
int slot = d->devfn >> 3;
assert(irq_num >= 0 && irq_num <= 3);
return slot & 0x03;
}
static void dino_set_timer_irq(void *opaque, int irq, int level)
{
/* ??? Not connected. */
}
static void dino_set_serial_irq(void *opaque, int irq, int level)
{
dino_set_irq(opaque, 10, level);
}
PCIBus *dino_init(MemoryRegion *addr_space,
qemu_irq *p_rtc_irq, qemu_irq *p_ser_irq)
{
DeviceState *dev;
DinoState *s;
PCIBus *b;
int i;
dev = qdev_create(NULL, TYPE_DINO_PCI_HOST_BRIDGE);
s = DINO_PCI_HOST_BRIDGE(dev);
/* Dino PCI access from main memory. */
memory_region_init_io(&s->this_mem, OBJECT(s), &dino_chip_ops,
s, "dino", 4096);
memory_region_add_subregion(addr_space, DINO_HPA, &s->this_mem);
/* Dino PCI config. */
memory_region_init_io(&s->parent_obj.conf_mem, OBJECT(&s->parent_obj),
&pci_host_conf_be_ops, dev, "pci-conf-idx", 4);
memory_region_init_io(&s->parent_obj.data_mem, OBJECT(&s->parent_obj),
&dino_config_data_ops, dev, "pci-conf-data", 4);
memory_region_add_subregion(&s->this_mem, DINO_PCI_CONFIG_ADDR,
&s->parent_obj.conf_mem);
memory_region_add_subregion(&s->this_mem, DINO_CONFIG_DATA,
&s->parent_obj.data_mem);
/* Dino PCI bus memory. */
memory_region_init(&s->pci_mem, OBJECT(s), "pci-memory", 1ull << 32);
b = pci_register_root_bus(dev, "pci", dino_set_irq, dino_pci_map_irq, s,
&s->pci_mem, get_system_io(),
PCI_DEVFN(0, 0), 32, TYPE_PCI_BUS);
s->parent_obj.bus = b;
qdev_init_nofail(dev);
/* Set up windows into PCI bus memory. */
for (i = 1; i < 31; i++) {
uint32_t addr = 0xf0000000 + i * DINO_MEM_CHUNK_SIZE;
char *name = g_strdup_printf("PCI Outbound Window %d", i);
memory_region_init_alias(&s->pci_mem_alias[i], OBJECT(s),
name, &s->pci_mem, addr,
DINO_MEM_CHUNK_SIZE);
}
/* Set up PCI view of memory: Bus master address space. */
memory_region_init(&s->bm, OBJECT(s), "bm-dino", 1ull << 32);
memory_region_init_alias(&s->bm_ram_alias, OBJECT(s),
"bm-system", addr_space, 0,
0xf0000000 + DINO_MEM_CHUNK_SIZE);
memory_region_init_alias(&s->bm_pci_alias, OBJECT(s),
"bm-pci", &s->pci_mem,
0xf0000000 + DINO_MEM_CHUNK_SIZE,
31 * DINO_MEM_CHUNK_SIZE);
memory_region_add_subregion(&s->bm, 0,
&s->bm_ram_alias);
memory_region_add_subregion(&s->bm,
0xf0000000 + DINO_MEM_CHUNK_SIZE,
&s->bm_pci_alias);
address_space_init(&s->bm_as, &s->bm, "pci-bm");
pci_setup_iommu(b, dino_pcihost_set_iommu, s);
*p_rtc_irq = qemu_allocate_irq(dino_set_timer_irq, s, 0);
*p_ser_irq = qemu_allocate_irq(dino_set_serial_irq, s, 0);
return b;
}
static int dino_pcihost_init(SysBusDevice *dev)
{
return 0;
}
static void dino_pcihost_class_init(ObjectClass *klass, void *data)
{
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
k->init = dino_pcihost_init;
dc->vmsd = &vmstate_dino;
}
static const TypeInfo dino_pcihost_info = {
.name = TYPE_DINO_PCI_HOST_BRIDGE,
.parent = TYPE_PCI_HOST_BRIDGE,
.instance_size = sizeof(DinoState),
.class_init = dino_pcihost_class_init,
};
static void dino_register_types(void)
{
type_register_static(&dino_pcihost_info);
}
type_init(dino_register_types)
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