/*
* ASPEED SDRAM Memory Controller
*
* Copyright (C) 2016 IBM Corp.
*
* This code is licensed under the GPL version 2 or later. See
* the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "hw/misc/aspeed_sdmc.h"
#include "hw/misc/aspeed_scu.h"
#include "hw/qdev-properties.h"
#include "qapi/error.h"
#include "trace.h"
/* Protection Key Register */
#define R_PROT (0x00 / 4)
#define PROT_KEY_UNLOCK 0xFC600309
/* Configuration Register */
#define R_CONF (0x04 / 4)
/*
* Configuration register Ox4 (for Aspeed AST2400 SOC)
*
* These are for the record and future use. ASPEED_SDMC_DRAM_SIZE is
* what we care about right now as it is checked by U-Boot to
* determine the RAM size.
*/
#define ASPEED_SDMC_RESERVED 0xFFFFF800 /* 31:11 reserved */
#define ASPEED_SDMC_AST2300_COMPAT (1 << 10)
#define ASPEED_SDMC_SCRAMBLE_PATTERN (1 << 9)
#define ASPEED_SDMC_DATA_SCRAMBLE (1 << 8)
#define ASPEED_SDMC_ECC_ENABLE (1 << 7)
#define ASPEED_SDMC_VGA_COMPAT (1 << 6) /* readonly */
#define ASPEED_SDMC_DRAM_BANK (1 << 5)
#define ASPEED_SDMC_DRAM_BURST (1 << 4)
#define ASPEED_SDMC_VGA_APERTURE(x) ((x & 0x3) << 2) /* readonly */
#define ASPEED_SDMC_VGA_8MB 0x0
#define ASPEED_SDMC_VGA_16MB 0x1
#define ASPEED_SDMC_VGA_32MB 0x2
#define ASPEED_SDMC_VGA_64MB 0x3
#define ASPEED_SDMC_DRAM_SIZE(x) (x & 0x3)
#define ASPEED_SDMC_DRAM_64MB 0x0
#define ASPEED_SDMC_DRAM_128MB 0x1
#define ASPEED_SDMC_DRAM_256MB 0x2
#define ASPEED_SDMC_DRAM_512MB 0x3
#define ASPEED_SDMC_READONLY_MASK \
(ASPEED_SDMC_RESERVED | ASPEED_SDMC_VGA_COMPAT | \
ASPEED_SDMC_VGA_APERTURE(ASPEED_SDMC_VGA_64MB))
/*
* Configuration register Ox4 (for Aspeed AST2500 SOC and higher)
*
* Incompatibilities are annotated in the list. ASPEED_SDMC_HW_VERSION
* should be set to 1 for the AST2500 SOC.
*/
#define ASPEED_SDMC_HW_VERSION(x) ((x & 0xf) << 28) /* readonly */
#define ASPEED_SDMC_SW_VERSION ((x & 0xff) << 20)
#define ASPEED_SDMC_CACHE_INITIAL_DONE (1 << 19) /* readonly */
#define ASPEED_SDMC_AST2500_RESERVED 0x7C000 /* 18:14 reserved */
#define ASPEED_SDMC_CACHE_DDR4_CONF (1 << 13)
#define ASPEED_SDMC_CACHE_INITIAL (1 << 12)
#define ASPEED_SDMC_CACHE_RANGE_CTRL (1 << 11)
#define ASPEED_SDMC_CACHE_ENABLE (1 << 10) /* differs from AST2400 */
#define ASPEED_SDMC_DRAM_TYPE (1 << 4) /* differs from AST2400 */
/* DRAM size definitions differs */
#define ASPEED_SDMC_AST2500_128MB 0x0
#define ASPEED_SDMC_AST2500_256MB 0x1
#define ASPEED_SDMC_AST2500_512MB 0x2
#define ASPEED_SDMC_AST2500_1024MB 0x3
#define ASPEED_SDMC_AST2500_READONLY_MASK \
(ASPEED_SDMC_HW_VERSION(0xf) | ASPEED_SDMC_CACHE_INITIAL_DONE | \
ASPEED_SDMC_AST2500_RESERVED | ASPEED_SDMC_VGA_COMPAT | \
ASPEED_SDMC_VGA_APERTURE(ASPEED_SDMC_VGA_64MB))
static uint64_t aspeed_sdmc_read(void *opaque, hwaddr addr, unsigned size)
{
AspeedSDMCState *s = ASPEED_SDMC(opaque);
addr >>= 2;
if (addr >= ARRAY_SIZE(s->regs)) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
__func__, addr);
return 0;
}
return s->regs[addr];
}
static void aspeed_sdmc_write(void *opaque, hwaddr addr, uint64_t data,
unsigned int size)
{
AspeedSDMCState *s = ASPEED_SDMC(opaque);
addr >>= 2;
if (addr >= ARRAY_SIZE(s->regs)) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
__func__, addr);
return;
}
if (addr != R_PROT && s->regs[R_PROT] != PROT_KEY_UNLOCK) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: SDMC is locked!\n", __func__);
return;
}
if (addr == R_CONF) {
/* Make sure readonly bits are kept */
switch (s->silicon_rev) {
case AST2400_A0_SILICON_REV:
case AST2400_A1_SILICON_REV:
data &= ~ASPEED_SDMC_READONLY_MASK;
break;
case AST2500_A0_SILICON_REV:
data &= ~ASPEED_SDMC_AST2500_READONLY_MASK;
break;
default:
g_assert_not_reached();
}
}
s->regs[addr] = data;
}
static const MemoryRegionOps aspeed_sdmc_ops = {
.read = aspeed_sdmc_read,
.write = aspeed_sdmc_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid.min_access_size = 4,
.valid.max_access_size = 4,
};
static int ast2400_rambits(AspeedSDMCState *s)
{
switch (s->ram_size >> 20) {
case 64:
return ASPEED_SDMC_DRAM_64MB;
case 128:
return ASPEED_SDMC_DRAM_128MB;
case 256:
return ASPEED_SDMC_DRAM_256MB;
case 512:
return ASPEED_SDMC_DRAM_512MB;
default:
break;
}
/* use a common default */
warn_report("Invalid RAM size 0x%" PRIx64 ". Using default 256M",
s->ram_size);
s->ram_size = 256 << 20;
return ASPEED_SDMC_DRAM_256MB;
}
static int ast2500_rambits(AspeedSDMCState *s)
{
switch (s->ram_size >> 20) {
case 128:
return ASPEED_SDMC_AST2500_128MB;
case 256:
return ASPEED_SDMC_AST2500_256MB;
case 512:
return ASPEED_SDMC_AST2500_512MB;
case 1024:
return ASPEED_SDMC_AST2500_1024MB;
default:
break;
}
/* use a common default */
warn_report("Invalid RAM size 0x%" PRIx64 ". Using default 512M",
s->ram_size);
s->ram_size = 512 << 20;
return ASPEED_SDMC_AST2500_512MB;
}
static void aspeed_sdmc_reset(DeviceState *dev)
{
AspeedSDMCState *s = ASPEED_SDMC(dev);
memset(s->regs, 0, sizeof(s->regs));
/* Set ram size bit and defaults values */
switch (s->silicon_rev) {
case AST2400_A0_SILICON_REV:
case AST2400_A1_SILICON_REV:
s->regs[R_CONF] |=
ASPEED_SDMC_VGA_COMPAT |
ASPEED_SDMC_DRAM_SIZE(s->ram_bits);
break;
case AST2500_A0_SILICON_REV:
case AST2500_A1_SILICON_REV:
s->regs[R_CONF] |=
ASPEED_SDMC_HW_VERSION(1) |
ASPEED_SDMC_VGA_APERTURE(ASPEED_SDMC_VGA_64MB) |
ASPEED_SDMC_DRAM_SIZE(s->ram_bits);
break;
default:
g_assert_not_reached();
}
}
static void aspeed_sdmc_realize(DeviceState *dev, Error **errp)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
AspeedSDMCState *s = ASPEED_SDMC(dev);
if (!is_supported_silicon_rev(s->silicon_rev)) {
error_setg(errp, "Unknown silicon revision: 0x%" PRIx32,
s->silicon_rev);
return;
}
switch (s->silicon_rev) {
case AST2400_A0_SILICON_REV:
case AST2400_A1_SILICON_REV:
s->ram_bits = ast2400_rambits(s);
break;
case AST2500_A0_SILICON_REV:
case AST2500_A1_SILICON_REV:
s->ram_bits = ast2500_rambits(s);
break;
default:
g_assert_not_reached();
}
memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_sdmc_ops, s,
TYPE_ASPEED_SDMC, 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
}
static const VMStateDescription vmstate_aspeed_sdmc = {
.name = "aspeed.sdmc",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, AspeedSDMCState, ASPEED_SDMC_NR_REGS),
VMSTATE_END_OF_LIST()
}
};
static Property aspeed_sdmc_properties[] = {
DEFINE_PROP_UINT32("silicon-rev", AspeedSDMCState, silicon_rev, 0),
DEFINE_PROP_UINT64("ram-size", AspeedSDMCState, ram_size, 0),
DEFINE_PROP_END_OF_LIST(),
};
static void aspeed_sdmc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = aspeed_sdmc_realize;
dc->reset = aspeed_sdmc_reset;
dc->desc = "ASPEED SDRAM Memory Controller";
dc->vmsd = &vmstate_aspeed_sdmc;
dc->props = aspeed_sdmc_properties;
}
static const TypeInfo aspeed_sdmc_info = {
.name = TYPE_ASPEED_SDMC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AspeedSDMCState),
.class_init = aspeed_sdmc_class_init,
};
static void aspeed_sdmc_register_types(void)
{
type_register_static(&aspeed_sdmc_info);
}
type_init(aspeed_sdmc_register_types);
