This commit implements the Global Control Register
for the MAX78000
Signed-off-by: Jackson Donaldson <jc...@duck.com>
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
---
hw/arm/Kconfig | 1 +
hw/misc/Kconfig | 3 +
hw/misc/max78000_gcr.c | 339 +++++++++++++++++++++++++++++++++
hw/misc/meson.build | 1 +
include/hw/misc/max78000_gcr.h | 129 +++++++++++++
5 files changed, 473 insertions(+)
create mode 100644 hw/misc/max78000_gcr.c
create mode 100644 include/hw/misc/max78000_gcr.h
diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 031e0bf59e..41bb64458f 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -368,6 +368,7 @@ config MAX78000_SOC
select ARM_V7M
select MAX78000_ICC
select MAX78000_UART
+ select MAX78000_GCR
config RASPI
bool
diff --git a/hw/misc/Kconfig b/hw/misc/Kconfig
index 781bcf74cc..fde2266b8f 100644
--- a/hw/misc/Kconfig
+++ b/hw/misc/Kconfig
@@ -47,6 +47,9 @@ config A9SCU
config ARM11SCU
bool
+config MAX78000_GCR
+ bool
+
config MAX78000_ICC
bool
diff --git a/hw/misc/max78000_gcr.c b/hw/misc/max78000_gcr.c
new file mode 100644
index 0000000000..8c282f3916
--- /dev/null
+++ b/hw/misc/max78000_gcr.c
@@ -0,0 +1,339 @@
+/*
+ * MAX78000 Global Control Registers
+ *
+ * Copyright (c) 2025 Jackson Donaldson <jc...@duck.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "trace.h"
+#include "hw/irq.h"
+#include "system/runstate.h"
+#include "migration/vmstate.h"
+#include "hw/qdev-properties.h"
+#include "hw/char/max78000_uart.h"
+#include "hw/misc/max78000_gcr.h"
+
+
+static void max78000_gcr_reset_hold(Object *obj, ResetType type)
+{
+ DeviceState *dev = DEVICE(obj);
+ Max78000GcrState *s = MAX78000_GCR(dev);
+ s->sysctrl = 0x21002;
+ s->rst0 = 0;
+ /* All clocks are always ready */
+ s->clkctrl = 0x3e140008;
+ s->pm = 0x3f000;
+ s->pclkdiv = 0;
+ s->pclkdis0 = 0xffffffff;
+ s->memctrl = 0x5;
+ s->memz = 0;
+ s->sysst = 0;
+ s->rst1 = 0;
+ s->pckdis1 = 0xffffffff;
+ s->eventen = 0;
+ s->revision = 0xa1;
+ s->sysie = 0;
+ s->eccerr = 0;
+ s->ecced = 0;
+ s->eccie = 0;
+ s->eccaddr = 0;
+}
+
+static uint64_t max78000_gcr_read(void *opaque, hwaddr addr,
+ unsigned int size)
+{
+ Max78000GcrState *s = opaque;
+
+ switch (addr) {
+ case SYSCTRL:
+ return s->sysctrl;
+
+ case RST0:
+ return s->rst0;
+
+ case CLKCTRL:
+ return s->clkctrl;
+
+ case PM:
+ return s->pm;
+
+ case PCLKDIV:
+ return s->pclkdiv;
+
+ case PCLKDIS0:
+ return s->pclkdis0;
+
+ case MEMCTRL:
+ return s->memctrl;
+
+ case MEMZ:
+ return s->memz;
+
+ case SYSST:
+ return s->sysst;
+
+ case RST1:
+ return s->rst1;
+
+ case PCKDIS1:
+ return s->pckdis1;
+
+ case EVENTEN:
+ return s->eventen;
+
+ case REVISION:
+ return s->revision;
+
+ case SYSIE:
+ return s->sysie;
+
+ case ECCERR:
+ return s->eccerr;
+
+ case ECCED:
+ return s->ecced;
+
+ case ECCIE:
+ return s->eccie;
+
+ case ECCADDR:
+ return s->eccaddr;
+
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%"
+ HWADDR_PRIx "\n", __func__, addr);
+ return 0;
+
+ }
+}
+
+static void max78000_gcr_write(void *opaque, hwaddr addr,
+ uint64_t val64, unsigned int size)
+{
+ Max78000GcrState *s = opaque;
+ uint32_t val = val64;
+ uint8_t zero[0xc000] = {0};
+ switch (addr) {
+ case SYSCTRL:
+ /* Checksum calculations always pass immediately */
+ s->sysctrl = (val & 0x30000) | 0x1002;
+ break;
+
+ case RST0:
+ if (val & SYSTEM_RESET) {
+ qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
+ }
+ if (val & PERIPHERAL_RESET) {
+ /*
+ * Peripheral reset resets all peripherals. The CPU
+ * retains its state. The GPIO, watchdog timers, AoD,
+ * RAM retention, and general control registers (GCR),
+ * including the clock configuration, are unaffected.
+ */
+ val = UART2_RESET | UART1_RESET | UART0_RESET |
+ ADC_RESET | CNN_RESET | TRNG_RESET |
+ RTC_RESET | I2C0_RESET | SPI1_RESET |
+ TMR3_RESET | TMR2_RESET | TMR1_RESET |
+ TMR0_RESET | WDT0_RESET | DMA_RESET;
+ }
+ if (val & SOFT_RESET) {
+ /* Soft reset also resets GPIO */
+ val = UART2_RESET | UART1_RESET | UART0_RESET |
+ ADC_RESET | CNN_RESET | TRNG_RESET |
+ RTC_RESET | I2C0_RESET | SPI1_RESET |
+ TMR3_RESET | TMR2_RESET | TMR1_RESET |
+ TMR0_RESET | GPIO1_RESET | GPIO0_RESET |
+ DMA_RESET;
+ }
+ if (val & UART2_RESET) {
+ device_cold_reset(s->uart2);
+ }
+ if (val & UART1_RESET) {
+ device_cold_reset(s->uart1);
+ }
+ if (val & UART0_RESET) {
+ device_cold_reset(s->uart0);
+ }
+ /* TODO: As other devices are implemented, add them here */
+ break;
+
+ case CLKCTRL:
+ s->clkctrl = val | SYSCLK_RDY;
+ break;
+
+ case PM:
+ s->pm = val;
+ break;
+
+ case PCLKDIV:
+ s->pclkdiv = val;
+ break;
+
+ case PCLKDIS0:
+ s->pclkdis0 = val;
+ break;
+
+ case MEMCTRL:
+ s->memctrl = val;
+ break;
+
+ case MEMZ:
+ if (val & ram0) {
+ address_space_write(&s->sram_as, SYSRAM0_START,
+ MEMTXATTRS_UNSPECIFIED, zero, 0x8000);
+ }
+ if (val & ram1) {
+ address_space_write(&s->sram_as, SYSRAM1_START,
+ MEMTXATTRS_UNSPECIFIED, zero, 0x8000);
+ }
+ if (val & ram2) {
+ address_space_write(&s->sram_as, SYSRAM2_START,
+ MEMTXATTRS_UNSPECIFIED, zero, 0xC000);
+ }
+ if (val & ram3) {
+ address_space_write(&s->sram_as, SYSRAM3_START,
+ MEMTXATTRS_UNSPECIFIED, zero, 0x4000);
+ }
+ break;
+
+ case SYSST:
+ s->sysst = val;
+ break;
+
+ case RST1:
+ /* TODO: As other devices are implemented, add them here */
+ s->rst1 = val;
+ break;
+
+ case PCKDIS1:
+ s->pckdis1 = val;
+ break;
+
+ case EVENTEN:
+ s->eventen = val;
+ break;
+
+ case REVISION:
+ s->revision = val;
+ break;
+
+ case SYSIE:
+ s->sysie = val;
+ break;
+
+ case ECCERR:
+ s->eccerr = val;
+ break;
+
+ case ECCED:
+ s->ecced = val;
+ break;
+
+ case ECCIE:
+ s->eccie = val;
+ break;
+
+ case ECCADDR:
+ s->eccaddr = val;
+ break;
+
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
+ __func__, addr);
+ break;
+
+ }
+}
+
+static const Property max78000_gcr_properties[] = {
+ DEFINE_PROP_LINK("sram", Max78000GcrState, sram,
+ TYPE_MEMORY_REGION, MemoryRegion*),
+ DEFINE_PROP_LINK("uart0", Max78000GcrState, uart0,
+ TYPE_MAX78000_UART, DeviceState*),
+ DEFINE_PROP_LINK("uart1", Max78000GcrState, uart1,
+ TYPE_MAX78000_UART, DeviceState*),
+ DEFINE_PROP_LINK("uart2", Max78000GcrState, uart2,
+ TYPE_MAX78000_UART, DeviceState*),
+};
+
+static const MemoryRegionOps max78000_gcr_ops = {
+ .read = max78000_gcr_read,
+ .write = max78000_gcr_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .valid.min_access_size = 4,
+ .valid.max_access_size = 4,
+};
+
+static const VMStateDescription vmstate_max78000_gcr = {
+ .name = TYPE_MAX78000_GCR,
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (const VMStateField[]) {
+ VMSTATE_UINT32(sysctrl, Max78000GcrState),
+ VMSTATE_UINT32(rst0, Max78000GcrState),
+ VMSTATE_UINT32(clkctrl, Max78000GcrState),
+ VMSTATE_UINT32(pm, Max78000GcrState),
+ VMSTATE_UINT32(pclkdiv, Max78000GcrState),
+ VMSTATE_UINT32(pclkdis0, Max78000GcrState),
+ VMSTATE_UINT32(memctrl, Max78000GcrState),
+ VMSTATE_UINT32(memz, Max78000GcrState),
+ VMSTATE_UINT32(sysst, Max78000GcrState),
+ VMSTATE_UINT32(rst1, Max78000GcrState),
+ VMSTATE_UINT32(pckdis1, Max78000GcrState),
+ VMSTATE_UINT32(eventen, Max78000GcrState),
+ VMSTATE_UINT32(revision, Max78000GcrState),
+ VMSTATE_UINT32(sysie, Max78000GcrState),
+ VMSTATE_UINT32(eccerr, Max78000GcrState),
+ VMSTATE_UINT32(ecced, Max78000GcrState),
+ VMSTATE_UINT32(eccie, Max78000GcrState),
+ VMSTATE_UINT32(eccaddr, Max78000GcrState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void max78000_gcr_init(Object *obj)
+{
+ Max78000GcrState *s = MAX78000_GCR(obj);
+
+ memory_region_init_io(&s->mmio, obj, &max78000_gcr_ops, s,
+ TYPE_MAX78000_GCR, 0x400);
+ sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
+
+}
+
+static void max78000_gcr_realize(DeviceState *dev, Error **errp)
+{
+ Max78000GcrState *s = MAX78000_GCR(dev);
+
+ address_space_init(&s->sram_as, s->sram, "sram");
+}
+
+static void max78000_gcr_class_init(ObjectClass *klass, const void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ ResettableClass *rc = RESETTABLE_CLASS(klass);
+
+ device_class_set_props(dc, max78000_gcr_properties);
+
+ dc->realize = max78000_gcr_realize;
+ dc->vmsd = &vmstate_max78000_gcr;
+ rc->phases.hold = max78000_gcr_reset_hold;
+}
+
+static const TypeInfo max78000_gcr_info = {
+ .name = TYPE_MAX78000_GCR,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(Max78000GcrState),
+ .instance_init = max78000_gcr_init,
+ .class_init = max78000_gcr_class_init,
+};
+
+static void max78000_gcr_register_types(void)
+{
+ type_register_static(&max78000_gcr_info);
+}
+
+type_init(max78000_gcr_register_types)
diff --git a/hw/misc/meson.build b/hw/misc/meson.build
index a21a994ff8..283d06dad4 100644
--- a/hw/misc/meson.build
+++ b/hw/misc/meson.build
@@ -70,6 +70,7 @@ system_ss.add(when: 'CONFIG_IMX', if_true: files(
'imx_ccm.c',
'imx_rngc.c',
))
+system_ss.add(when: 'CONFIG_MAX78000_GCR', if_true: files('max78000_gcr.c'))
system_ss.add(when: 'CONFIG_MAX78000_ICC', if_true: files('max78000_icc.c'))
system_ss.add(when: 'CONFIG_NPCM7XX', if_true: files(
'npcm_clk.c',
diff --git a/include/hw/misc/max78000_gcr.h b/include/hw/misc/max78000_gcr.h
new file mode 100644
index 0000000000..f04c8a3ee7
--- /dev/null
+++ b/include/hw/misc/max78000_gcr.h
@@ -0,0 +1,129 @@
+/*
+ * MAX78000 Global Control Register
+ *
+ * Copyright (c) 2025 Jackson Donaldson <jc...@duck.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef HW_MAX78000_GCR_H
+#define HW_MAX78000_GCR_H
+
+#include "hw/sysbus.h"
+#include "qom/object.h"
+
+#define TYPE_MAX78000_GCR "max78000-gcr"
+OBJECT_DECLARE_SIMPLE_TYPE(Max78000GcrState, MAX78000_GCR)
+
+#define SYSCTRL 0x0
+#define RST0 0x4
+#define CLKCTRL 0x8
+#define PM 0xc
+#define PCLKDIV 0x18
+#define PCLKDIS0 0x24
+#define MEMCTRL 0x28
+#define MEMZ 0x2c
+#define SYSST 0x40
+#define RST1 0x44
+#define PCKDIS1 0x48
+#define EVENTEN 0x4c
+#define REVISION 0x50
+#define SYSIE 0x54
+#define ECCERR 0x64
+#define ECCED 0x68
+#define ECCIE 0x6c
+#define ECCADDR 0x70
+
+/* RST0 */
+#define SYSTEM_RESET (1 << 31)
+#define PERIPHERAL_RESET (1 << 30)
+#define SOFT_RESET (1 << 29)
+#define UART2_RESET (1 << 28)
+
+#define ADC_RESET (1 << 26)
+#define CNN_RESET (1 << 25)
+#define TRNG_RESET (1 << 24)
+
+#define RTC_RESET (1 << 17)
+#define I2C0_RESET (1 << 16)
+
+#define SPI1_RESET (1 << 13)
+#define UART1_RESET (1 << 12)
+#define UART0_RESET (1 << 11)
+
+#define TMR3_RESET (1 << 8)
+#define TMR2_RESET (1 << 7)
+#define TMR1_RESET (1 << 6)
+#define TMR0_RESET (1 << 5)
+
+#define GPIO1_RESET (1 << 3)
+#define GPIO0_RESET (1 << 2)
+#define WDT0_RESET (1 << 1)
+#define DMA_RESET (1 << 0)
+
+/* CLKCTRL */
+#define SYSCLK_RDY (1 << 13)
+
+/* MEMZ */
+#define ram0 (1 << 0)
+#define ram1 (1 << 1)
+#define ram2 (1 << 2)
+#define ram3 (1 << 3)
+
+/* RST1 */
+#define CPU1_RESET (1 << 31)
+
+#define SIMO_RESET (1 << 25)
+#define DVS_RESET (1 << 24)
+
+#define I2C2_RESET (1 << 20)
+#define I2S_RESET (1 << 19)
+
+#define SMPHR_RESET (1 << 16)
+
+#define SPI0_RESET (1 << 11)
+#define AES_RESET (1 << 10)
+#define CRC_RESET (1 << 9)
+
+#define PT_RESET (1 << 1)
+#define I2C1_RESET (1 << 0)
+
+
+#define SYSRAM0_START 0x20000000
+#define SYSRAM1_START 0x20008000
+#define SYSRAM2_START 0x20010000
+#define SYSRAM3_START 0x2001C000
+
+struct Max78000GcrState {
+ SysBusDevice parent_obj;
+
+ MemoryRegion mmio;
+
+ uint32_t sysctrl;
+ uint32_t rst0;
+ uint32_t clkctrl;
+ uint32_t pm;
+ uint32_t pclkdiv;
+ uint32_t pclkdis0;
+ uint32_t memctrl;
+ uint32_t memz;
+ uint32_t sysst;
+ uint32_t rst1;
+ uint32_t pckdis1;
+ uint32_t eventen;
+ uint32_t revision;
+ uint32_t sysie;
+ uint32_t eccerr;
+ uint32_t ecced;
+ uint32_t eccie;
+ uint32_t eccaddr;
+
+ MemoryRegion *sram;
+ AddressSpace sram_as;
+
+ DeviceState *uart0;
+ DeviceState *uart1;
+ DeviceState *uart2;
+
+};
+
+#endif
--
2.34.1
