hw/misc: Add a basic Aspeed LPC controller model

This is a very minimal framework to access registers which are used to
configure the AHB memory mapping of the flash chips on the LPC HC
Firmware address space.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Message-Id: <20210302014317.915120-5-andrew@aj.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

7 files changed, 192 insertions, 2 deletions

diff --git a/docs/system/arm/aspeed.rst b/docs/system/arm/aspeed.rst
index 8972aa3..d1fb8f2 100644
--- a/docs/system/arm/aspeed.rst
+++ b/docs/system/arm/aspeed.rst
@@ -48,6 +48,7 @@ Supported devices
  * UART
  * Ethernet controllers
  * Front LEDs (PCA9552 on I2C bus)
+ * LPC Peripheral Controller (a subset of subdevices are supported)
 
 
 Missing devices
@@ -56,7 +57,6 @@ Missing devices
  * Coprocessor support
  * ADC (out of tree implementation)
  * PWM and Fan Controller
- * LPC Bus Controller
  * Slave GPIO Controller
  * Super I/O Controller
  * Hash/Crypto Engine
diff --git a/hw/arm/aspeed_ast2600.c b/hw/arm/aspeed_ast2600.c
index 7635d4b..78a8d6e 100644
--- a/hw/arm/aspeed_ast2600.c
+++ b/hw/arm/aspeed_ast2600.c
@@ -211,6 +211,8 @@ static void aspeed_soc_ast2600_init(Object *obj)
 
     object_initialize_child(obj, "emmc-controller.sdhci", &s->emmc.slots[0],
                             TYPE_SYSBUS_SDHCI);
+
+    object_initialize_child(obj, "lpc", &s->lpc, TYPE_ASPEED_LPC);
 }
 
 /*
@@ -462,6 +464,14 @@ static void aspeed_soc_ast2600_realize(DeviceState *dev, Error **errp)
     sysbus_mmio_map(SYS_BUS_DEVICE(&s->emmc), 0, sc->memmap[ASPEED_DEV_EMMC]);
     sysbus_connect_irq(SYS_BUS_DEVICE(&s->emmc), 0,
                        aspeed_soc_get_irq(s, ASPEED_DEV_EMMC));
+
+    /* LPC */
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->lpc), errp)) {
+        return;
+    }
+    sysbus_mmio_map(SYS_BUS_DEVICE(&s->lpc), 0, sc->memmap[ASPEED_DEV_LPC]);
+    sysbus_connect_irq(SYS_BUS_DEVICE(&s->lpc), 0,
+                       aspeed_soc_get_irq(s, ASPEED_DEV_LPC));
 }
 
 static void aspeed_soc_ast2600_class_init(ObjectClass *oc, void *data)
diff --git a/hw/arm/aspeed_soc.c b/hw/arm/aspeed_soc.c
index 7eefd54..4f098da 100644
--- a/hw/arm/aspeed_soc.c
+++ b/hw/arm/aspeed_soc.c
@@ -211,6 +211,8 @@ static void aspeed_soc_init(Object *obj)
         object_initialize_child(obj, "sdhci[*]", &s->sdhci.slots[i],
                                 TYPE_SYSBUS_SDHCI);
     }
+
+    object_initialize_child(obj, "lpc", &s->lpc, TYPE_ASPEED_LPC);
 }
 
 static void aspeed_soc_realize(DeviceState *dev, Error **errp)
@@ -393,6 +395,14 @@ static void aspeed_soc_realize(DeviceState *dev, Error **errp)
                     sc->memmap[ASPEED_DEV_SDHCI]);
     sysbus_connect_irq(SYS_BUS_DEVICE(&s->sdhci), 0,
                        aspeed_soc_get_irq(s, ASPEED_DEV_SDHCI));
+
+    /* LPC */
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->lpc), errp)) {
+        return;
+    }
+    sysbus_mmio_map(SYS_BUS_DEVICE(&s->lpc), 0, sc->memmap[ASPEED_DEV_LPC]);
+    sysbus_connect_irq(SYS_BUS_DEVICE(&s->lpc), 0,
+                       aspeed_soc_get_irq(s, ASPEED_DEV_LPC));
 }
 static Property aspeed_soc_properties[] = {
     DEFINE_PROP_LINK("dram", AspeedSoCState, dram_mr, TYPE_MEMORY_REGION,
diff --git a/hw/misc/aspeed_lpc.c b/hw/misc/aspeed_lpc.c
new file mode 100644
index 0000000..e668e98
--- /dev/null
+++ b/hw/misc/aspeed_lpc.c
@@ -0,0 +1,131 @@
+/*
+ *  ASPEED LPC Controller
+ *
+ *  Copyright (C) 2017-2018 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_lpc.h"
+#include "qapi/error.h"
+#include "hw/qdev-properties.h"
+#include "migration/vmstate.h"
+
+#define TO_REG(offset) ((offset) >> 2)
+
+#define HICR0                TO_REG(0x00)
+#define HICR1                TO_REG(0x04)
+#define HICR2                TO_REG(0x08)
+#define HICR3                TO_REG(0x0C)
+#define HICR4                TO_REG(0x10)
+#define HICR5                TO_REG(0x80)
+#define HICR6                TO_REG(0x84)
+#define HICR7                TO_REG(0x88)
+#define HICR8                TO_REG(0x8C)
+
+static uint64_t aspeed_lpc_read(void *opaque, hwaddr offset, unsigned size)
+{
+    AspeedLPCState *s = ASPEED_LPC(opaque);
+    int reg = TO_REG(offset);
+
+    if (reg >= ARRAY_SIZE(s->regs)) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
+                      __func__, offset);
+        return 0;
+    }
+
+    return s->regs[reg];
+}
+
+static void aspeed_lpc_write(void *opaque, hwaddr offset, uint64_t data,
+                             unsigned int size)
+{
+    AspeedLPCState *s = ASPEED_LPC(opaque);
+    int reg = TO_REG(offset);
+
+    if (reg >= ARRAY_SIZE(s->regs)) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
+                      __func__, offset);
+        return;
+    }
+
+    s->regs[reg] = data;
+}
+
+static const MemoryRegionOps aspeed_lpc_ops = {
+    .read = aspeed_lpc_read,
+    .write = aspeed_lpc_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid = {
+        .min_access_size = 1,
+        .max_access_size = 4,
+    },
+};
+
+static void aspeed_lpc_reset(DeviceState *dev)
+{
+    struct AspeedLPCState *s = ASPEED_LPC(dev);
+
+    memset(s->regs, 0, sizeof(s->regs));
+
+    s->regs[HICR7] = s->hicr7;
+}
+
+static void aspeed_lpc_realize(DeviceState *dev, Error **errp)
+{
+    AspeedLPCState *s = ASPEED_LPC(dev);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+
+    sysbus_init_irq(sbd, &s->irq);
+
+    memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_lpc_ops, s,
+            TYPE_ASPEED_LPC, 0x1000);
+
+    sysbus_init_mmio(sbd, &s->iomem);
+}
+
+static const VMStateDescription vmstate_aspeed_lpc = {
+    .name = TYPE_ASPEED_LPC,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32_ARRAY(regs, AspeedLPCState, ASPEED_LPC_NR_REGS),
+        VMSTATE_END_OF_LIST(),
+    }
+};
+
+static Property aspeed_lpc_properties[] = {
+    DEFINE_PROP_UINT32("hicr7", AspeedLPCState, hicr7, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void aspeed_lpc_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = aspeed_lpc_realize;
+    dc->reset = aspeed_lpc_reset;
+    dc->desc = "Aspeed LPC Controller",
+    dc->vmsd = &vmstate_aspeed_lpc;
+    device_class_set_props(dc, aspeed_lpc_properties);
+}
+
+static const TypeInfo aspeed_lpc_info = {
+    .name = TYPE_ASPEED_LPC,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(AspeedLPCState),
+    .class_init = aspeed_lpc_class_init,
+};
+
+static void aspeed_lpc_register_types(void)
+{
+    type_register_static(&aspeed_lpc_info);
+}
+
+type_init(aspeed_lpc_register_types);
diff --git a/hw/misc/meson.build b/hw/misc/meson.build
index 6292839..e326338 100644
--- a/hw/misc/meson.build
+++ b/hw/misc/meson.build
@@ -102,7 +102,12 @@ softmmu_ss.add(when: 'CONFIG_ARMSSE_MHU', if_true: files('armsse-mhu.c'))
 softmmu_ss.add(when: 'CONFIG_PVPANIC_ISA', if_true: files('pvpanic-isa.c'))
 softmmu_ss.add(when: 'CONFIG_PVPANIC_PCI', if_true: files('pvpanic-pci.c'))
 softmmu_ss.add(when: 'CONFIG_AUX', if_true: files('auxbus.c'))
-softmmu_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files('aspeed_scu.c', 'aspeed_sdmc.c', 'aspeed_xdma.c'))
+softmmu_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files(
+  'aspeed_lpc.c',
+  'aspeed_scu.c',
+  'aspeed_sdmc.c',
+  'aspeed_xdma.c'))
+
 softmmu_ss.add(when: 'CONFIG_MSF2', if_true: files('msf2-sysreg.c'))
 softmmu_ss.add(when: 'CONFIG_NRF51_SOC', if_true: files('nrf51_rng.c'))
 
diff --git a/include/hw/arm/aspeed_soc.h b/include/hw/arm/aspeed_soc.h
index 11cfe6e..42c64bd 100644
--- a/include/hw/arm/aspeed_soc.h
+++ b/include/hw/arm/aspeed_soc.h
@@ -28,6 +28,7 @@
 #include "hw/sd/aspeed_sdhci.h"
 #include "hw/usb/hcd-ehci.h"
 #include "qom/object.h"
+#include "hw/misc/aspeed_lpc.h"
 
 #define ASPEED_SPIS_NUM  2
 #define ASPEED_EHCIS_NUM 2
@@ -61,6 +62,7 @@ struct AspeedSoCState {
     AspeedGPIOState gpio_1_8v;
     AspeedSDHCIState sdhci;
     AspeedSDHCIState emmc;
+    AspeedLPCState lpc;
 };
 
 #define TYPE_ASPEED_SOC "aspeed-soc"
diff --git a/include/hw/misc/aspeed_lpc.h b/include/hw/misc/aspeed_lpc.h
new file mode 100644
index 0000000..0fbb7f6
--- /dev/null
+++ b/include/hw/misc/aspeed_lpc.h
@@ -0,0 +1,32 @@
+/*
+ *  ASPEED LPC Controller
+ *
+ *  Copyright (C) 2017-2018 IBM Corp.
+ *
+ * This code is licensed under the GPL version 2 or later.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#ifndef ASPEED_LPC_H
+#define ASPEED_LPC_H
+
+#include "hw/sysbus.h"
+
+#define TYPE_ASPEED_LPC "aspeed.lpc"
+#define ASPEED_LPC(obj) OBJECT_CHECK(AspeedLPCState, (obj), TYPE_ASPEED_LPC)
+
+#define ASPEED_LPC_NR_REGS (0x260 >> 2)
+
+typedef struct AspeedLPCState {
+    /* <private> */
+    SysBusDevice parent;
+
+    /*< public >*/
+    MemoryRegion iomem;
+    qemu_irq irq;
+
+    uint32_t regs[ASPEED_LPC_NR_REGS];
+    uint32_t hicr7;
+} AspeedLPCState;
+
+#endif /* _ASPEED_LPC_H_ */