Implement basic part of SA-1110/SA-1100

Basic implementation of DEC/Intel SA-1100/SA-1110 chips emulation.
Implemented:
 - IRQs
 - GPIO
 - PPC
 - RTC
 - UARTs (no IrDA/etc.)
 - OST reused from pxa25x

Everything else is TODO (esp. PM/idle/sleep!) - see the todo in the
hw/strongarm.c

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

2 files changed, 1662 insertions, 0 deletions

diff --git a/hw/strongarm.c b/hw/strongarm.c
new file mode 100644
index 0000000..de08bdf
--- /dev/null
+++ b/hw/strongarm.c
@@ -0,0 +1,1598 @@
+/*
+ * StrongARM SA-1100/SA-1110 emulation
+ *
+ * Copyright (C) 2011 Dmitry Eremin-Solenikov
+ *
+ * Largely based on StrongARM emulation:
+ * Copyright (c) 2006 Openedhand Ltd.
+ * Written by Andrzej Zaborowski <balrog@zabor.org>
+ *
+ * UART code based on QEMU 16550A UART emulation
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ * Copyright (c) 2008 Citrix Systems, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "sysbus.h"
+#include "strongarm.h"
+#include "qemu-error.h"
+#include "arm-misc.h"
+#include "sysemu.h"
+#include "ssi.h"
+
+//#define DEBUG
+
+/*
+ TODO
+ - Implement cp15, c14 ?
+ - Implement cp15, c15 !!! (idle used in L)
+ - Implement idle mode handling/DIM
+ - Implement sleep mode/Wake sources
+ - Implement reset control
+ - Implement memory control regs
+ - PCMCIA handling
+ - Maybe support MBGNT/MBREQ
+ - DMA channels
+ - GPCLK
+ - IrDA
+ - MCP
+ - Enhance UART with modem signals
+ */
+
+#ifdef DEBUG
+# define DPRINTF(format, ...) printf(format , ## __VA_ARGS__)
+#else
+# define DPRINTF(format, ...) do { } while (0)
+#endif
+
+static struct {
+    target_phys_addr_t io_base;
+    int irq;
+} sa_serial[] = {
+    { 0x80010000, SA_PIC_UART1 },
+    { 0x80030000, SA_PIC_UART2 },
+    { 0x80050000, SA_PIC_UART3 },
+    { 0, 0 }
+};
+
+/* Interrupt Controller */
+typedef struct {
+    SysBusDevice busdev;
+    qemu_irq    irq;
+    qemu_irq    fiq;
+
+    uint32_t pending;
+    uint32_t enabled;
+    uint32_t is_fiq;
+    uint32_t int_idle;
+} StrongARMPICState;
+
+#define ICIP    0x00
+#define ICMR    0x04
+#define ICLR    0x08
+#define ICFP    0x10
+#define ICPR    0x20
+#define ICCR    0x0c
+
+#define SA_PIC_SRCS     32
+
+
+static void strongarm_pic_update(void *opaque)
+{
+    StrongARMPICState *s = opaque;
+
+    /* FIXME: reflect DIM */
+    qemu_set_irq(s->fiq, s->pending & s->enabled &  s->is_fiq);
+    qemu_set_irq(s->irq, s->pending & s->enabled & ~s->is_fiq);
+}
+
+static void strongarm_pic_set_irq(void *opaque, int irq, int level)
+{
+    StrongARMPICState *s = opaque;
+
+    if (level) {
+        s->pending |= 1 << irq;
+    } else {
+        s->pending &= ~(1 << irq);
+    }
+
+    strongarm_pic_update(s);
+}
+
+static uint32_t strongarm_pic_mem_read(void *opaque, target_phys_addr_t offset)
+{
+    StrongARMPICState *s = opaque;
+
+    switch (offset) {
+    case ICIP:
+        return s->pending & ~s->is_fiq & s->enabled;
+    case ICMR:
+        return s->enabled;
+    case ICLR:
+        return s->is_fiq;
+    case ICCR:
+        return s->int_idle == 0;
+    case ICFP:
+        return s->pending & s->is_fiq & s->enabled;
+    case ICPR:
+        return s->pending;
+    default:
+        printf("%s: Bad register offset 0x" TARGET_FMT_plx "\n",
+                        __func__, offset);
+        return 0;
+    }
+}
+
+static void strongarm_pic_mem_write(void *opaque, target_phys_addr_t offset,
+                uint32_t value)
+{
+    StrongARMPICState *s = opaque;
+
+    switch (offset) {
+    case ICMR:
+        s->enabled = value;
+        break;
+    case ICLR:
+        s->is_fiq = value;
+        break;
+    case ICCR:
+        s->int_idle = (value & 1) ? 0 : ~0;
+        break;
+    default:
+        printf("%s: Bad register offset 0x" TARGET_FMT_plx "\n",
+                        __func__, offset);
+        break;
+    }
+    strongarm_pic_update(s);
+}
+
+static CPUReadMemoryFunc * const strongarm_pic_readfn[] = {
+    strongarm_pic_mem_read,
+    strongarm_pic_mem_read,
+    strongarm_pic_mem_read,
+};
+
+static CPUWriteMemoryFunc * const strongarm_pic_writefn[] = {
+    strongarm_pic_mem_write,
+    strongarm_pic_mem_write,
+    strongarm_pic_mem_write,
+};
+
+static int strongarm_pic_initfn(SysBusDevice *dev)
+{
+    StrongARMPICState *s = FROM_SYSBUS(StrongARMPICState, dev);
+    int iomemtype;
+
+    qdev_init_gpio_in(&dev->qdev, strongarm_pic_set_irq, SA_PIC_SRCS);
+    iomemtype = cpu_register_io_memory(strongarm_pic_readfn,
+                    strongarm_pic_writefn, s, DEVICE_NATIVE_ENDIAN);
+    sysbus_init_mmio(dev, 0x1000, iomemtype);
+    sysbus_init_irq(dev, &s->irq);
+    sysbus_init_irq(dev, &s->fiq);
+
+    return 0;
+}
+
+static int strongarm_pic_post_load(void *opaque, int version_id)
+{
+    strongarm_pic_update(opaque);
+    return 0;
+}
+
+static VMStateDescription vmstate_strongarm_pic_regs = {
+    .name = "strongarm_pic",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .minimum_version_id_old = 0,
+    .post_load = strongarm_pic_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(pending, StrongARMPICState),
+        VMSTATE_UINT32(enabled, StrongARMPICState),
+        VMSTATE_UINT32(is_fiq, StrongARMPICState),
+        VMSTATE_UINT32(int_idle, StrongARMPICState),
+        VMSTATE_END_OF_LIST(),
+    },
+};
+
+static SysBusDeviceInfo strongarm_pic_info = {
+    .init       = strongarm_pic_initfn,
+    .qdev.name  = "strongarm_pic",
+    .qdev.desc  = "StrongARM PIC",
+    .qdev.size  = sizeof(StrongARMPICState),
+    .qdev.vmsd  = &vmstate_strongarm_pic_regs,
+};
+
+/* Real-Time Clock */
+#define RTAR 0x00 /* RTC Alarm register */
+#define RCNR 0x04 /* RTC Counter register */
+#define RTTR 0x08 /* RTC Timer Trim register */
+#define RTSR 0x10 /* RTC Status register */
+
+#define RTSR_AL (1 << 0) /* RTC Alarm detected */
+#define RTSR_HZ (1 << 1) /* RTC 1Hz detected */
+#define RTSR_ALE (1 << 2) /* RTC Alarm enable */
+#define RTSR_HZE (1 << 3) /* RTC 1Hz enable */
+
+/* 16 LSB of RTTR are clockdiv for internal trim logic,
+ * trim delete isn't emulated, so
+ * f = 32 768 / (RTTR_trim + 1) */
+
+typedef struct {
+    SysBusDevice busdev;
+    uint32_t rttr;
+    uint32_t rtsr;
+    uint32_t rtar;
+    uint32_t last_rcnr;
+    int64_t last_hz;
+    QEMUTimer *rtc_alarm;
+    QEMUTimer *rtc_hz;
+    qemu_irq rtc_irq;
+    qemu_irq rtc_hz_irq;
+} StrongARMRTCState;
+
+static inline void strongarm_rtc_int_update(StrongARMRTCState *s)
+{
+    qemu_set_irq(s->rtc_irq, s->rtsr & RTSR_AL);
+    qemu_set_irq(s->rtc_hz_irq, s->rtsr & RTSR_HZ);
+}
+
+static void strongarm_rtc_hzupdate(StrongARMRTCState *s)
+{
+    int64_t rt = qemu_get_clock_ms(rt_clock);
+    s->last_rcnr += ((rt - s->last_hz) << 15) /
+            (1000 * ((s->rttr & 0xffff) + 1));
+    s->last_hz = rt;
+}
+
+static inline void strongarm_rtc_timer_update(StrongARMRTCState *s)
+{
+    if ((s->rtsr & RTSR_HZE) && !(s->rtsr & RTSR_HZ)) {
+        qemu_mod_timer(s->rtc_hz, s->last_hz + 1000);
+    } else {
+        qemu_del_timer(s->rtc_hz);
+    }
+
+    if ((s->rtsr & RTSR_ALE) && !(s->rtsr & RTSR_AL)) {
+        qemu_mod_timer(s->rtc_alarm, s->last_hz +
+                (((s->rtar - s->last_rcnr) * 1000 *
+                  ((s->rttr & 0xffff) + 1)) >> 15));
+    } else {
+        qemu_del_timer(s->rtc_alarm);
+    }
+}
+
+static inline void strongarm_rtc_alarm_tick(void *opaque)
+{
+    StrongARMRTCState *s = opaque;
+    s->rtsr |= RTSR_AL;
+    strongarm_rtc_timer_update(s);
+    strongarm_rtc_int_update(s);
+}
+
+static inline void strongarm_rtc_hz_tick(void *opaque)
+{
+    StrongARMRTCState *s = opaque;
+    s->rtsr |= RTSR_HZ;
+    strongarm_rtc_timer_update(s);
+    strongarm_rtc_int_update(s);
+}
+
+static uint32_t strongarm_rtc_read(void *opaque, target_phys_addr_t addr)
+{
+    StrongARMRTCState *s = opaque;
+
+    switch (addr) {
+    case RTTR:
+        return s->rttr;
+    case RTSR:
+        return s->rtsr;
+    case RTAR:
+        return s->rtar;
+    case RCNR:
+        return s->last_rcnr +
+                ((qemu_get_clock_ms(rt_clock) - s->last_hz) << 15) /
+                (1000 * ((s->rttr & 0xffff) + 1));
+    default:
+        printf("%s: Bad register 0x" TARGET_FMT_plx "\n", __func__, addr);
+        return 0;
+    }
+}
+
+static void strongarm_rtc_write(void *opaque, target_phys_addr_t addr,
+                uint32_t value)
+{
+    StrongARMRTCState *s = opaque;
+    uint32_t old_rtsr;
+
+    switch (addr) {
+    case RTTR:
+        strongarm_rtc_hzupdate(s);
+        s->rttr = value;
+        strongarm_rtc_timer_update(s);
+        break;
+
+    case RTSR:
+        old_rtsr = s->rtsr;
+        s->rtsr = (value & (RTSR_ALE | RTSR_HZE)) |
+                  (s->rtsr & ~(value & (RTSR_AL | RTSR_HZ)));
+
+        if (s->rtsr != old_rtsr) {
+            strongarm_rtc_timer_update(s);
+        }
+
+        strongarm_rtc_int_update(s);
+        break;
+
+    case RTAR:
+        s->rtar = value;
+        strongarm_rtc_timer_update(s);
+        break;
+
+    case RCNR:
+        strongarm_rtc_hzupdate(s);
+        s->last_rcnr = value;
+        strongarm_rtc_timer_update(s);
+        break;
+
+    default:
+        printf("%s: Bad register 0x" TARGET_FMT_plx "\n", __func__, addr);
+    }
+}
+
+static CPUReadMemoryFunc * const strongarm_rtc_readfn[] = {
+    strongarm_rtc_read,
+    strongarm_rtc_read,
+    strongarm_rtc_read,
+};
+
+static CPUWriteMemoryFunc * const strongarm_rtc_writefn[] = {
+    strongarm_rtc_write,
+    strongarm_rtc_write,
+    strongarm_rtc_write,
+};
+
+static int strongarm_rtc_init(SysBusDevice *dev)
+{
+    StrongARMRTCState *s = FROM_SYSBUS(StrongARMRTCState, dev);
+    struct tm tm;
+    int iomemtype;
+
+    s->rttr = 0x0;
+    s->rtsr = 0;
+
+    qemu_get_timedate(&tm, 0);
+
+    s->last_rcnr = (uint32_t) mktimegm(&tm);
+    s->last_hz = qemu_get_clock_ms(rt_clock);
+
+    s->rtc_alarm = qemu_new_timer_ms(rt_clock, strongarm_rtc_alarm_tick, s);
+    s->rtc_hz = qemu_new_timer_ms(rt_clock, strongarm_rtc_hz_tick, s);
+
+    sysbus_init_irq(dev, &s->rtc_irq);
+    sysbus_init_irq(dev, &s->rtc_hz_irq);
+
+    iomemtype = cpu_register_io_memory(strongarm_rtc_readfn,
+                    strongarm_rtc_writefn, s, DEVICE_NATIVE_ENDIAN);
+    sysbus_init_mmio(dev, 0x10000, iomemtype);
+
+    return 0;
+}
+
+static void strongarm_rtc_pre_save(void *opaque)
+{
+    StrongARMRTCState *s = opaque;
+
+    strongarm_rtc_hzupdate(s);
+}
+
+static int strongarm_rtc_post_load(void *opaque, int version_id)
+{
+    StrongARMRTCState *s = opaque;
+
+    strongarm_rtc_timer_update(s);
+    strongarm_rtc_int_update(s);
+
+    return 0;
+}
+
+static const VMStateDescription vmstate_strongarm_rtc_regs = {
+    .name = "strongarm-rtc",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .minimum_version_id_old = 0,
+    .pre_save = strongarm_rtc_pre_save,
+    .post_load = strongarm_rtc_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(rttr, StrongARMRTCState),
+        VMSTATE_UINT32(rtsr, StrongARMRTCState),
+        VMSTATE_UINT32(rtar, StrongARMRTCState),
+        VMSTATE_UINT32(last_rcnr, StrongARMRTCState),
+        VMSTATE_INT64(last_hz, StrongARMRTCState),
+        VMSTATE_END_OF_LIST(),
+    },
+};
+
+static SysBusDeviceInfo strongarm_rtc_sysbus_info = {
+    .init       = strongarm_rtc_init,
+    .qdev.name  = "strongarm-rtc",
+    .qdev.desc  = "StrongARM RTC Controller",
+    .qdev.size  = sizeof(StrongARMRTCState),
+    .qdev.vmsd  = &vmstate_strongarm_rtc_regs,
+};
+
+/* GPIO */
+#define GPLR 0x00
+#define GPDR 0x04
+#define GPSR 0x08
+#define GPCR 0x0c
+#define GRER 0x10
+#define GFER 0x14
+#define GEDR 0x18
+#define GAFR 0x1c
+
+typedef struct StrongARMGPIOInfo StrongARMGPIOInfo;
+struct StrongARMGPIOInfo {
+    SysBusDevice busdev;
+    qemu_irq handler[28];
+    qemu_irq irqs[11];
+    qemu_irq irqX;
+
+    uint32_t ilevel;
+    uint32_t olevel;
+    uint32_t dir;
+    uint32_t rising;
+    uint32_t falling;
+    uint32_t status;
+    uint32_t gpsr;
+    uint32_t gafr;
+
+    uint32_t prev_level;
+};
+
+
+static void strongarm_gpio_irq_update(StrongARMGPIOInfo *s)
+{
+    int i;
+    for (i = 0; i < 11; i++) {
+        qemu_set_irq(s->irqs[i], s->status & (1 << i));
+    }
+
+    qemu_set_irq(s->irqX, (s->status & ~0x7ff));
+}
+
+static void strongarm_gpio_set(void *opaque, int line, int level)
+{
+    StrongARMGPIOInfo *s = opaque;
+    uint32_t mask;
+
+    mask = 1 << line;
+
+    if (level) {
+        s->status |= s->rising & mask &
+                ~s->ilevel & ~s->dir;
+        s->ilevel |= mask;
+    } else {
+        s->status |= s->falling & mask &
+                s->ilevel & ~s->dir;
+        s->ilevel &= ~mask;
+    }
+
+    if (s->status & mask) {
+        strongarm_gpio_irq_update(s);
+    }
+}
+
+static void strongarm_gpio_handler_update(StrongARMGPIOInfo *s)
+{
+    uint32_t level, diff;
+    int bit;
+
+    level = s->olevel & s->dir;
+
+    for (diff = s->prev_level ^ level; diff; diff ^= 1 << bit) {
+        bit = ffs(diff) - 1;
+        qemu_set_irq(s->handler[bit], (level >> bit) & 1);
+    }
+
+    s->prev_level = level;
+}
+
+static uint32_t strongarm_gpio_read(void *opaque, target_phys_addr_t offset)
+{
+    StrongARMGPIOInfo *s = opaque;
+
+    switch (offset) {
+    case GPDR:        /* GPIO Pin-Direction registers */
+        return s->dir;
+
+    case GPSR:        /* GPIO Pin-Output Set registers */
+        DPRINTF("%s: Read from a write-only register 0x" TARGET_FMT_plx "\n",
+                        __func__, offset);
+        return s->gpsr;    /* Return last written value.  */
+
+    case GPCR:        /* GPIO Pin-Output Clear registers */
+        DPRINTF("%s: Read from a write-only register 0x" TARGET_FMT_plx "\n",
+                        __func__, offset);
+        return 31337;        /* Specified as unpredictable in the docs.  */
+
+    case GRER:        /* GPIO Rising-Edge Detect Enable registers */
+        return s->rising;
+
+    case GFER:        /* GPIO Falling-Edge Detect Enable registers */
+        return s->falling;
+
+    case GAFR:        /* GPIO Alternate Function registers */
+        return s->gafr;
+
+    case GPLR:        /* GPIO Pin-Level registers */
+        return (s->olevel & s->dir) |
+               (s->ilevel & ~s->dir);
+
+    case GEDR:        /* GPIO Edge Detect Status registers */
+        return s->status;
+
+    default:
+        printf("%s: Bad offset 0x" TARGET_FMT_plx "\n", __func__, offset);
+    }
+
+    return 0;
+}
+
+static void strongarm_gpio_write(void *opaque,
+                target_phys_addr_t offset, uint32_t value)
+{
+    StrongARMGPIOInfo *s = opaque;
+
+    switch (offset) {
+    case GPDR:        /* GPIO Pin-Direction registers */
+        s->dir = value;
+        strongarm_gpio_handler_update(s);
+        break;
+
+    case GPSR:        /* GPIO Pin-Output Set registers */
+        s->olevel |= value;
+        strongarm_gpio_handler_update(s);
+        s->gpsr = value;
+        break;
+
+    case GPCR:        /* GPIO Pin-Output Clear registers */
+        s->olevel &= ~value;
+        strongarm_gpio_handler_update(s);
+        break;
+
+    case GRER:        /* GPIO Rising-Edge Detect Enable registers */
+        s->rising = value;
+        break;
+
+    case GFER:        /* GPIO Falling-Edge Detect Enable registers */
+        s->falling = value;
+        break;
+
+    case GAFR:        /* GPIO Alternate Function registers */
+        s->gafr = value;
+        break;
+
+    case GEDR:        /* GPIO Edge Detect Status registers */
+        s->status &= ~value;
+        strongarm_gpio_irq_update(s);
+        break;
+
+    default:
+        printf("%s: Bad offset 0x" TARGET_FMT_plx "\n", __func__, offset);
+    }
+}
+
+static CPUReadMemoryFunc * const strongarm_gpio_readfn[] = {
+    strongarm_gpio_read,
+    strongarm_gpio_read,
+    strongarm_gpio_read
+};
+
+static CPUWriteMemoryFunc * const strongarm_gpio_writefn[] = {
+    strongarm_gpio_write,
+    strongarm_gpio_write,
+    strongarm_gpio_write
+};
+
+static DeviceState *strongarm_gpio_init(target_phys_addr_t base,
+                DeviceState *pic)
+{
+    DeviceState *dev;
+    int i;
+
+    dev = qdev_create(NULL, "strongarm-gpio");
+    qdev_init_nofail(dev);
+
+    sysbus_mmio_map(sysbus_from_qdev(dev), 0, base);
+    for (i = 0; i < 12; i++)
+        sysbus_connect_irq(sysbus_from_qdev(dev), i,
+                    qdev_get_gpio_in(pic, SA_PIC_GPIO0_EDGE + i));
+
+    return dev;
+}
+
+static int strongarm_gpio_initfn(SysBusDevice *dev)
+{
+    int iomemtype;
+    StrongARMGPIOInfo *s;
+    int i;
+
+    s = FROM_SYSBUS(StrongARMGPIOInfo, dev);
+
+    qdev_init_gpio_in(&dev->qdev, strongarm_gpio_set, 28);
+    qdev_init_gpio_out(&dev->qdev, s->handler, 28);
+
+    iomemtype = cpu_register_io_memory(strongarm_gpio_readfn,
+                    strongarm_gpio_writefn, s, DEVICE_NATIVE_ENDIAN);
+
+    sysbus_init_mmio(dev, 0x1000, iomemtype);
+    for (i = 0; i < 11; i++) {
+        sysbus_init_irq(dev, &s->irqs[i]);
+    }
+    sysbus_init_irq(dev, &s->irqX);
+
+    return 0;
+}
+
+static const VMStateDescription vmstate_strongarm_gpio_regs = {
+    .name = "strongarm-gpio",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .minimum_version_id_old = 0,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(ilevel, StrongARMGPIOInfo),
+        VMSTATE_UINT32(olevel, StrongARMGPIOInfo),
+        VMSTATE_UINT32(dir, StrongARMGPIOInfo),
+        VMSTATE_UINT32(rising, StrongARMGPIOInfo),
+        VMSTATE_UINT32(falling, StrongARMGPIOInfo),
+        VMSTATE_UINT32(status, StrongARMGPIOInfo),
+        VMSTATE_UINT32(gafr, StrongARMGPIOInfo),
+        VMSTATE_END_OF_LIST(),
+    },
+};
+
+static SysBusDeviceInfo strongarm_gpio_info = {
+    .init       = strongarm_gpio_initfn,
+    .qdev.name  = "strongarm-gpio",
+    .qdev.desc  = "StrongARM GPIO controller",
+    .qdev.size  = sizeof(StrongARMGPIOInfo),
+};
+
+/* Peripheral Pin Controller */
+#define PPDR 0x00
+#define PPSR 0x04
+#define PPAR 0x08
+#define PSDR 0x0c
+#define PPFR 0x10
+
+typedef struct StrongARMPPCInfo StrongARMPPCInfo;
+struct StrongARMPPCInfo {
+    SysBusDevice busdev;
+    qemu_irq handler[28];
+
+    uint32_t ilevel;
+    uint32_t olevel;
+    uint32_t dir;
+    uint32_t ppar;
+    uint32_t psdr;
+    uint32_t ppfr;
+
+    uint32_t prev_level;
+};
+
+static void strongarm_ppc_set(void *opaque, int line, int level)
+{
+    StrongARMPPCInfo *s = opaque;
+
+    if (level) {
+        s->ilevel |= 1 << line;
+    } else {
+        s->ilevel &= ~(1 << line);
+    }
+}
+
+static void strongarm_ppc_handler_update(StrongARMPPCInfo *s)
+{
+    uint32_t level, diff;
+    int bit;
+
+    level = s->olevel & s->dir;
+
+    for (diff = s->prev_level ^ level; diff; diff ^= 1 << bit) {
+        bit = ffs(diff) - 1;
+        qemu_set_irq(s->handler[bit], (level >> bit) & 1);
+    }
+
+    s->prev_level = level;
+}
+
+static uint32_t strongarm_ppc_read(void *opaque, target_phys_addr_t offset)
+{
+    StrongARMPPCInfo *s = opaque;
+
+    switch (offset) {
+    case PPDR:        /* PPC Pin Direction registers */
+        return s->dir | ~0x3fffff;
+
+    case PPSR:        /* PPC Pin State registers */
+        return (s->olevel & s->dir) |
+               (s->ilevel & ~s->dir) |
+               ~0x3fffff;
+
+    case PPAR:
+        return s->ppar | ~0x41000;
+
+    case PSDR:
+        return s->psdr;
+
+    case PPFR:
+        return s->ppfr | ~0x7f001;
+
+    default:
+        printf("%s: Bad offset 0x" TARGET_FMT_plx "\n", __func__, offset);
+    }
+
+    return 0;
+}
+
+static void strongarm_ppc_write(void *opaque,
+                target_phys_addr_t offset, uint32_t value)
+{
+    StrongARMPPCInfo *s = opaque;
+
+    switch (offset) {
+    case PPDR:        /* PPC Pin Direction registers */
+        s->dir = value & 0x3fffff;
+        strongarm_ppc_handler_update(s);
+        break;
+
+    case PPSR:        /* PPC Pin State registers */
+        s->olevel = value & s->dir & 0x3fffff;
+        strongarm_ppc_handler_update(s);
+        break;
+
+    case PPAR:
+        s->ppar = value & 0x41000;
+        break;
+
+    case PSDR:
+        s->psdr = value & 0x3fffff;
+        break;
+
+    case PPFR:
+        s->ppfr = value & 0x7f001;
+        break;
+
+    default:
+        printf("%s: Bad offset 0x" TARGET_FMT_plx "\n", __func__, offset);
+    }
+}
+
+static CPUReadMemoryFunc * const strongarm_ppc_readfn[] = {
+    strongarm_ppc_read,
+    strongarm_ppc_read,
+    strongarm_ppc_read
+};
+
+static CPUWriteMemoryFunc * const strongarm_ppc_writefn[] = {
+    strongarm_ppc_write,
+    strongarm_ppc_write,
+    strongarm_ppc_write
+};
+
+static int strongarm_ppc_init(SysBusDevice *dev)
+{
+    int iomemtype;
+    StrongARMPPCInfo *s;
+
+    s = FROM_SYSBUS(StrongARMPPCInfo, dev);
+
+    qdev_init_gpio_in(&dev->qdev, strongarm_ppc_set, 22);
+    qdev_init_gpio_out(&dev->qdev, s->handler, 22);
+
+    iomemtype = cpu_register_io_memory(strongarm_ppc_readfn,
+                    strongarm_ppc_writefn, s, DEVICE_NATIVE_ENDIAN);
+
+    sysbus_init_mmio(dev, 0x1000, iomemtype);
+
+    return 0;
+}
+
+static const VMStateDescription vmstate_strongarm_ppc_regs = {
+    .name = "strongarm-ppc",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .minimum_version_id_old = 0,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(ilevel, StrongARMPPCInfo),
+        VMSTATE_UINT32(olevel, StrongARMPPCInfo),
+        VMSTATE_UINT32(dir, StrongARMPPCInfo),
+        VMSTATE_UINT32(ppar, StrongARMPPCInfo),
+        VMSTATE_UINT32(psdr, StrongARMPPCInfo),
+        VMSTATE_UINT32(ppfr, StrongARMPPCInfo),
+        VMSTATE_END_OF_LIST(),
+    },
+};
+
+static SysBusDeviceInfo strongarm_ppc_info = {
+    .init       = strongarm_ppc_init,
+    .qdev.name  = "strongarm-ppc",
+    .qdev.desc  = "StrongARM PPC controller",
+    .qdev.size  = sizeof(StrongARMPPCInfo),
+};
+
+/* UART Ports */
+#define UTCR0 0x00
+#define UTCR1 0x04
+#define UTCR2 0x08
+#define UTCR3 0x0c
+#define UTDR  0x14
+#define UTSR0 0x1c
+#define UTSR1 0x20
+
+#define UTCR0_PE  (1 << 0) /* Parity enable */
+#define UTCR0_OES (1 << 1) /* Even parity */
+#define UTCR0_SBS (1 << 2) /* 2 stop bits */
+#define UTCR0_DSS (1 << 3) /* 8-bit data */
+
+#define UTCR3_RXE (1 << 0) /* Rx enable */
+#define UTCR3_TXE (1 << 1) /* Tx enable */
+#define UTCR3_BRK (1 << 2) /* Force Break */
+#define UTCR3_RIE (1 << 3) /* Rx int enable */
+#define UTCR3_TIE (1 << 4) /* Tx int enable */
+#define UTCR3_LBM (1 << 5) /* Loopback */
+
+#define UTSR0_TFS (1 << 0) /* Tx FIFO nearly empty */
+#define UTSR0_RFS (1 << 1) /* Rx FIFO nearly full */
+#define UTSR0_RID (1 << 2) /* Receiver Idle */
+#define UTSR0_RBB (1 << 3) /* Receiver begin break */
+#define UTSR0_REB (1 << 4) /* Receiver end break */
+#define UTSR0_EIF (1 << 5) /* Error in FIFO */
+
+#define UTSR1_RNE (1 << 1) /* Receive FIFO not empty */
+#define UTSR1_TNF (1 << 2) /* Transmit FIFO not full */
+#define UTSR1_PRE (1 << 3) /* Parity error */
+#define UTSR1_FRE (1 << 4) /* Frame error */
+#define UTSR1_ROR (1 << 5) /* Receive Over Run */
+
+#define RX_FIFO_PRE (1 << 8)
+#define RX_FIFO_FRE (1 << 9)
+#define RX_FIFO_ROR (1 << 10)
+
+typedef struct {
+    SysBusDevice busdev;
+    CharDriverState *chr;
+    qemu_irq irq;
+
+    uint8_t utcr0;
+    uint16_t brd;
+    uint8_t utcr3;
+    uint8_t utsr0;
+    uint8_t utsr1;
+
+    uint8_t tx_fifo[8];
+    uint8_t tx_start;
+    uint8_t tx_len;
+    uint16_t rx_fifo[12]; /* value + error flags in high bits */
+    uint8_t rx_start;
+    uint8_t rx_len;
+
+    uint64_t char_transmit_time; /* time to transmit a char in ticks*/
+    bool wait_break_end;
+    QEMUTimer *rx_timeout_timer;
+    QEMUTimer *tx_timer;
+} StrongARMUARTState;
+
+static void strongarm_uart_update_status(StrongARMUARTState *s)
+{
+    uint16_t utsr1 = 0;
+
+    if (s->tx_len != 8) {
+        utsr1 |= UTSR1_TNF;
+    }
+
+    if (s->rx_len != 0) {
+        uint16_t ent = s->rx_fifo[s->rx_start];
+
+        utsr1 |= UTSR1_RNE;
+        if (ent & RX_FIFO_PRE) {
+            s->utsr1 |= UTSR1_PRE;
+        }
+        if (ent & RX_FIFO_FRE) {
+            s->utsr1 |= UTSR1_FRE;
+        }
+        if (ent & RX_FIFO_ROR) {
+            s->utsr1 |= UTSR1_ROR;
+        }
+    }
+
+    s->utsr1 = utsr1;
+}
+
+static void strongarm_uart_update_int_status(StrongARMUARTState *s)
+{
+    uint16_t utsr0 = s->utsr0 &
+            (UTSR0_REB | UTSR0_RBB | UTSR0_RID);
+    int i;
+
+    if ((s->utcr3 & UTCR3_TXE) &&
+                (s->utcr3 & UTCR3_TIE) &&
+                s->tx_len <= 4) {
+        utsr0 |= UTSR0_TFS;
+    }
+
+    if ((s->utcr3 & UTCR3_RXE) &&
+                (s->utcr3 & UTCR3_RIE) &&
+                s->rx_len > 4) {
+        utsr0 |= UTSR0_RFS;
+    }
+
+    for (i = 0; i < s->rx_len && i < 4; i++)
+        if (s->rx_fifo[(s->rx_start + i) % 12] & ~0xff) {
+            utsr0 |= UTSR0_EIF;
+            break;
+        }
+
+    s->utsr0 = utsr0;
+    qemu_set_irq(s->irq, utsr0);
+}
+
+static void strongarm_uart_update_parameters(StrongARMUARTState *s)
+{
+    int speed, parity, data_bits, stop_bits, frame_size;
+    QEMUSerialSetParams ssp;
+
+    /* Start bit. */
+    frame_size = 1;
+    if (s->utcr0 & UTCR0_PE) {
+        /* Parity bit. */
+        frame_size++;
+        if (s->utcr0 & UTCR0_OES) {
+            parity = 'E';
+        } else {
+            parity = 'O';
+        }
+    } else {
+            parity = 'N';
+    }
+    if (s->utcr0 & UTCR0_SBS) {
+        stop_bits = 2;
+    } else {
+        stop_bits = 1;
+    }
+
+    data_bits = (s->utcr0 & UTCR0_DSS) ? 8 : 7;
+    frame_size += data_bits + stop_bits;
+    speed = 3686400 / 16 / (s->brd + 1);
+    ssp.speed = speed;
+    ssp.parity = parity;
+    ssp.data_bits = data_bits;
+    ssp.stop_bits = stop_bits;
+    s->char_transmit_time =  (get_ticks_per_sec() / speed) * frame_size;
+    if (s->chr) {
+        qemu_chr_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
+    }
+
+    DPRINTF(stderr, "%s speed=%d parity=%c data=%d stop=%d\n", s->chr->label,
+            speed, parity, data_bits, stop_bits);
+}
+
+static void strongarm_uart_rx_to(void *opaque)
+{
+    StrongARMUARTState *s = opaque;
+
+    if (s->rx_len) {
+        s->utsr0 |= UTSR0_RID;
+        strongarm_uart_update_int_status(s);
+    }
+}
+
+static void strongarm_uart_rx_push(StrongARMUARTState *s, uint16_t c)
+{
+    if ((s->utcr3 & UTCR3_RXE) == 0) {
+        /* rx disabled */
+        return;
+    }
+
+    if (s->wait_break_end) {
+        s->utsr0 |= UTSR0_REB;
+        s->wait_break_end = false;
+    }
+
+    if (s->rx_len < 12) {
+        s->rx_fifo[(s->rx_start + s->rx_len) % 12] = c;
+        s->rx_len++;
+    } else
+        s->rx_fifo[(s->rx_start + 11) % 12] |= RX_FIFO_ROR;
+}
+
+static int strongarm_uart_can_receive(void *opaque)
+{
+    StrongARMUARTState *s = opaque;
+
+    if (s->rx_len == 12) {
+        return 0;
+    }
+    /* It's best not to get more than 2/3 of RX FIFO, so advertise that much */
+    if (s->rx_len < 8) {
+        return 8 - s->rx_len;
+    }
+    return 1;
+}
+
+static void strongarm_uart_receive(void *opaque, const uint8_t *buf, int size)
+{
+    StrongARMUARTState *s = opaque;
+    int i;
+
+    for (i = 0; i < size; i++) {
+        strongarm_uart_rx_push(s, buf[i]);
+    }
+
+    /* call the timeout receive callback in 3 char transmit time */
+    qemu_mod_timer(s->rx_timeout_timer,
+                    qemu_get_clock_ns(vm_clock) + s->char_transmit_time * 3);
+
+    strongarm_uart_update_status(s);
+    strongarm_uart_update_int_status(s);
+}
+
+static void strongarm_uart_event(void *opaque, int event)
+{
+    StrongARMUARTState *s = opaque;
+    if (event == CHR_EVENT_BREAK) {
+        s->utsr0 |= UTSR0_RBB;
+        strongarm_uart_rx_push(s, RX_FIFO_FRE);
+        s->wait_break_end = true;
+        strongarm_uart_update_status(s);
+        strongarm_uart_update_int_status(s);
+    }
+}
+
+static void strongarm_uart_tx(void *opaque)
+{
+    StrongARMUARTState *s = opaque;
+    uint64_t new_xmit_ts = qemu_get_clock_ns(vm_clock);
+
+    if (s->utcr3 & UTCR3_LBM) /* loopback */ {
+        strongarm_uart_receive(s, &s->tx_fifo[s->tx_start], 1);
+    } else if (s->chr) {
+        qemu_chr_write(s->chr, &s->tx_fifo[s->tx_start], 1);
+    }
+
+    s->tx_start = (s->tx_start + 1) % 8;
+    s->tx_len--;
+    if (s->tx_len) {
+        qemu_mod_timer(s->tx_timer, new_xmit_ts + s->char_transmit_time);
+    }
+    strongarm_uart_update_status(s);
+    strongarm_uart_update_int_status(s);
+}
+
+static uint32_t strongarm_uart_read(void *opaque, target_phys_addr_t addr)
+{
+    StrongARMUARTState *s = opaque;
+    uint16_t ret;
+
+    switch (addr) {
+    case UTCR0:
+        return s->utcr0;
+
+    case UTCR1:
+        return s->brd >> 8;
+
+    case UTCR2:
+        return s->brd & 0xff;
+
+    case UTCR3:
+        return s->utcr3;
+
+    case UTDR:
+        if (s->rx_len != 0) {
+            ret = s->rx_fifo[s->rx_start];
+            s->rx_start = (s->rx_start + 1) % 12;
+            s->rx_len--;
+            strongarm_uart_update_status(s);
+            strongarm_uart_update_int_status(s);
+            return ret;
+        }
+        return 0;
+
+    case UTSR0:
+        return s->utsr0;
+
+    case UTSR1:
+        return s->utsr1;
+
+    default:
+        printf("%s: Bad register 0x" TARGET_FMT_plx "\n", __func__, addr);
+        return 0;
+    }
+}
+
+static void strongarm_uart_write(void *opaque, target_phys_addr_t addr,
+                uint32_t value)
+{
+    StrongARMUARTState *s = opaque;
+
+    switch (addr) {
+    case UTCR0:
+        s->utcr0 = value & 0x7f;
+        strongarm_uart_update_parameters(s);
+        break;
+
+    case UTCR1:
+        s->brd = (s->brd & 0xff) | ((value & 0xf) << 8);
+        strongarm_uart_update_parameters(s);
+        break;
+
+    case UTCR2:
+        s->brd = (s->brd & 0xf00) | (value & 0xff);
+        strongarm_uart_update_parameters(s);
+        break;
+
+    case UTCR3:
+        s->utcr3 = value & 0x3f;
+        if ((s->utcr3 & UTCR3_RXE) == 0) {
+            s->rx_len = 0;
+        }
+        if ((s->utcr3 & UTCR3_TXE) == 0) {
+            s->tx_len = 0;
+        }
+        strongarm_uart_update_status(s);
+        strongarm_uart_update_int_status(s);
+        break;
+
+    case UTDR:
+        if ((s->utcr3 & UTCR3_TXE) && s->tx_len != 8) {
+            s->tx_fifo[(s->tx_start + s->tx_len) % 8] = value;
+            s->tx_len++;
+            strongarm_uart_update_status(s);
+            strongarm_uart_update_int_status(s);
+            if (s->tx_len == 1) {
+                strongarm_uart_tx(s);
+            }
+        }
+        break;
+
+    case UTSR0:
+        s->utsr0 = s->utsr0 & ~(value &
+                (UTSR0_REB | UTSR0_RBB | UTSR0_RID));
+        strongarm_uart_update_int_status(s);
+        break;
+
+    default:
+        printf("%s: Bad register 0x" TARGET_FMT_plx "\n", __func__, addr);
+    }
+}
+
+static CPUReadMemoryFunc * const strongarm_uart_readfn[] = {
+    strongarm_uart_read,
+    strongarm_uart_read,
+    strongarm_uart_read,
+};
+
+static CPUWriteMemoryFunc * const strongarm_uart_writefn[] = {
+    strongarm_uart_write,
+    strongarm_uart_write,
+    strongarm_uart_write,
+};
+
+static int strongarm_uart_init(SysBusDevice *dev)
+{
+    StrongARMUARTState *s = FROM_SYSBUS(StrongARMUARTState, dev);
+    int iomemtype;
+
+    iomemtype = cpu_register_io_memory(strongarm_uart_readfn,
+                    strongarm_uart_writefn, s, DEVICE_NATIVE_ENDIAN);
+    sysbus_init_mmio(dev, 0x10000, iomemtype);
+    sysbus_init_irq(dev, &s->irq);
+
+    s->rx_timeout_timer = qemu_new_timer_ns(vm_clock, strongarm_uart_rx_to, s);
+    s->tx_timer = qemu_new_timer_ns(vm_clock, strongarm_uart_tx, s);
+
+    if (s->chr) {
+        qemu_chr_add_handlers(s->chr,
+                        strongarm_uart_can_receive,
+                        strongarm_uart_receive,
+                        strongarm_uart_event,
+                        s);
+    }
+
+    return 0;
+}
+
+static void strongarm_uart_reset(DeviceState *dev)
+{
+    StrongARMUARTState *s = DO_UPCAST(StrongARMUARTState, busdev.qdev, dev);
+
+    s->utcr0 = UTCR0_DSS; /* 8 data, no parity */
+    s->brd = 23;    /* 9600 */
+    /* enable send & recv - this actually violates spec */
+    s->utcr3 = UTCR3_TXE | UTCR3_RXE;
+
+    s->rx_len = s->tx_len = 0;
+
+    strongarm_uart_update_parameters(s);
+    strongarm_uart_update_status(s);
+    strongarm_uart_update_int_status(s);
+}
+
+static int strongarm_uart_post_load(void *opaque, int version_id)
+{
+    StrongARMUARTState *s = opaque;
+
+    strongarm_uart_update_parameters(s);
+    strongarm_uart_update_status(s);
+    strongarm_uart_update_int_status(s);
+
+    /* tx and restart timer */
+    if (s->tx_len) {
+        strongarm_uart_tx(s);
+    }
+
+    /* restart rx timeout timer */
+    if (s->rx_len) {
+        qemu_mod_timer(s->rx_timeout_timer,
+                qemu_get_clock_ns(vm_clock) + s->char_transmit_time * 3);
+    }
+
+    return 0;
+}
+
+static const VMStateDescription vmstate_strongarm_uart_regs = {
+    .name = "strongarm-uart",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .minimum_version_id_old = 0,
+    .post_load = strongarm_uart_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT8(utcr0, StrongARMUARTState),
+        VMSTATE_UINT16(brd, StrongARMUARTState),
+        VMSTATE_UINT8(utcr3, StrongARMUARTState),
+        VMSTATE_UINT8(utsr0, StrongARMUARTState),
+        VMSTATE_UINT8_ARRAY(tx_fifo, StrongARMUARTState, 8),
+        VMSTATE_UINT8(tx_start, StrongARMUARTState),
+        VMSTATE_UINT8(tx_len, StrongARMUARTState),
+        VMSTATE_UINT16_ARRAY(rx_fifo, StrongARMUARTState, 12),
+        VMSTATE_UINT8(rx_start, StrongARMUARTState),
+        VMSTATE_UINT8(rx_len, StrongARMUARTState),
+        VMSTATE_BOOL(wait_break_end, StrongARMUARTState),
+        VMSTATE_END_OF_LIST(),
+    },
+};
+
+static SysBusDeviceInfo strongarm_uart_info = {
+    .init       = strongarm_uart_init,
+    .qdev.name  = "strongarm-uart",
+    .qdev.desc  = "StrongARM UART controller",
+    .qdev.size  = sizeof(StrongARMUARTState),
+    .qdev.reset = strongarm_uart_reset,
+    .qdev.vmsd  = &vmstate_strongarm_uart_regs,
+    .qdev.props = (Property[]) {
+        DEFINE_PROP_CHR("chardev", StrongARMUARTState, chr),
+        DEFINE_PROP_END_OF_LIST(),
+    }
+};
+
+/* Synchronous Serial Ports */
+typedef struct {
+    SysBusDevice busdev;
+    qemu_irq irq;
+    SSIBus *bus;
+
+    uint16_t sscr[2];
+    uint16_t sssr;
+
+    uint16_t rx_fifo[8];
+    uint8_t rx_level;
+    uint8_t rx_start;
+} StrongARMSSPState;
+
+#define SSCR0 0x60 /* SSP Control register 0 */
+#define SSCR1 0x64 /* SSP Control register 1 */
+#define SSDR  0x6c /* SSP Data register */
+#define SSSR  0x74 /* SSP Status register */
+
+/* Bitfields for above registers */
+#define SSCR0_SPI(x)    (((x) & 0x30) == 0x00)
+#define SSCR0_SSP(x)    (((x) & 0x30) == 0x10)
+#define SSCR0_UWIRE(x)  (((x) & 0x30) == 0x20)
+#define SSCR0_PSP(x)    (((x) & 0x30) == 0x30)
+#define SSCR0_SSE       (1 << 7)
+#define SSCR0_DSS(x)    (((x) & 0xf) + 1)
+#define SSCR1_RIE       (1 << 0)
+#define SSCR1_TIE       (1 << 1)
+#define SSCR1_LBM       (1 << 2)
+#define SSSR_TNF        (1 << 2)
+#define SSSR_RNE        (1 << 3)
+#define SSSR_TFS        (1 << 5)
+#define SSSR_RFS        (1 << 6)
+#define SSSR_ROR        (1 << 7)
+#define SSSR_RW         0x0080
+
+static void strongarm_ssp_int_update(StrongARMSSPState *s)
+{
+    int level = 0;
+
+    level |= (s->sssr & SSSR_ROR);
+    level |= (s->sssr & SSSR_RFS)  &&  (s->sscr[1] & SSCR1_RIE);
+    level |= (s->sssr & SSSR_TFS)  &&  (s->sscr[1] & SSCR1_TIE);
+    qemu_set_irq(s->irq, level);
+}
+
+static void strongarm_ssp_fifo_update(StrongARMSSPState *s)
+{
+    s->sssr &= ~SSSR_TFS;
+    s->sssr &= ~SSSR_TNF;
+    if (s->sscr[0] & SSCR0_SSE) {
+        if (s->rx_level >= 4) {
+            s->sssr |= SSSR_RFS;
+        } else {
+            s->sssr &= ~SSSR_RFS;
+        }
+        if (s->rx_level) {
+            s->sssr |= SSSR_RNE;
+        } else {
+            s->sssr &= ~SSSR_RNE;
+        }
+        /* TX FIFO is never filled, so it is always in underrun
+           condition if SSP is enabled */
+        s->sssr |= SSSR_TFS;
+        s->sssr |= SSSR_TNF;
+    }
+
+    strongarm_ssp_int_update(s);
+}
+
+static uint32_t strongarm_ssp_read(void *opaque, target_phys_addr_t addr)
+{
+    StrongARMSSPState *s = opaque;
+    uint32_t retval;
+
+    switch (addr) {
+    case SSCR0:
+        return s->sscr[0];
+    case SSCR1:
+        return s->sscr[1];
+    case SSSR:
+        return s->sssr;
+    case SSDR:
+        if (~s->sscr[0] & SSCR0_SSE) {
+            return 0xffffffff;
+        }
+        if (s->rx_level < 1) {
+            printf("%s: SSP Rx Underrun\n", __func__);
+            return 0xffffffff;
+        }
+        s->rx_level--;
+        retval = s->rx_fifo[s->rx_start++];
+        s->rx_start &= 0x7;
+        strongarm_ssp_fifo_update(s);
+        return retval;
+    default:
+        printf("%s: Bad register 0x" TARGET_FMT_plx "\n", __func__, addr);
+        break;
+    }
+    return 0;
+}
+
+static void strongarm_ssp_write(void *opaque, target_phys_addr_t addr,
+                uint32_t value)
+{
+    StrongARMSSPState *s = opaque;
+
+    switch (addr) {
+    case SSCR0:
+        s->sscr[0] = value & 0xffbf;
+        if ((s->sscr[0] & SSCR0_SSE) && SSCR0_DSS(value) < 4) {
+            printf("%s: Wrong data size: %i bits\n", __func__,
+                            SSCR0_DSS(value));
+        }
+        if (!(value & SSCR0_SSE)) {
+            s->sssr = 0;
+            s->rx_level = 0;
+        }
+        strongarm_ssp_fifo_update(s);
+        break;
+
+    case SSCR1:
+        s->sscr[1] = value & 0x2f;
+        if (value & SSCR1_LBM) {
+            printf("%s: Attempt to use SSP LBM mode\n", __func__);
+        }
+        strongarm_ssp_fifo_update(s);
+        break;
+
+    case SSSR:
+        s->sssr &= ~(value & SSSR_RW);
+        strongarm_ssp_int_update(s);
+        break;
+
+    case SSDR:
+        if (SSCR0_UWIRE(s->sscr[0])) {
+            value &= 0xff;
+        } else
+            /* Note how 32bits overflow does no harm here */
+            value &= (1 << SSCR0_DSS(s->sscr[0])) - 1;
+
+        /* Data goes from here to the Tx FIFO and is shifted out from
+         * there directly to the slave, no need to buffer it.
+         */
+        if (s->sscr[0] & SSCR0_SSE) {
+            uint32_t readval;
+            if (s->sscr[1] & SSCR1_LBM) {
+                readval = value;
+            } else {
+                readval = ssi_transfer(s->bus, value);
+            }
+
+            if (s->rx_level < 0x08) {
+                s->rx_fifo[(s->rx_start + s->rx_level++) & 0x7] = readval;
+            } else {
+                s->sssr |= SSSR_ROR;
+            }
+        }
+        strongarm_ssp_fifo_update(s);
+        break;
+
+    default:
+        printf("%s: Bad register 0x" TARGET_FMT_plx "\n", __func__, addr);
+        break;
+    }
+}
+
+static CPUReadMemoryFunc * const strongarm_ssp_readfn[] = {
+    strongarm_ssp_read,
+    strongarm_ssp_read,
+    strongarm_ssp_read,
+};
+
+static CPUWriteMemoryFunc * const strongarm_ssp_writefn[] = {
+    strongarm_ssp_write,
+    strongarm_ssp_write,
+    strongarm_ssp_write,
+};
+
+static int strongarm_ssp_post_load(void *opaque, int version_id)
+{
+    StrongARMSSPState *s = opaque;
+
+    strongarm_ssp_fifo_update(s);
+
+    return 0;
+}
+
+static int strongarm_ssp_init(SysBusDevice *dev)
+{
+    int iomemtype;
+    StrongARMSSPState *s = FROM_SYSBUS(StrongARMSSPState, dev);
+
+    sysbus_init_irq(dev, &s->irq);
+
+    iomemtype = cpu_register_io_memory(strongarm_ssp_readfn,
+                                       strongarm_ssp_writefn, s,
+                                       DEVICE_NATIVE_ENDIAN);
+    sysbus_init_mmio(dev, 0x1000, iomemtype);
+
+    s->bus = ssi_create_bus(&dev->qdev, "ssi");
+    return 0;
+}
+
+static void strongarm_ssp_reset(DeviceState *dev)
+{
+    StrongARMSSPState *s = DO_UPCAST(StrongARMSSPState, busdev.qdev, dev);
+    s->sssr = 0x03; /* 3 bit data, SPI, disabled */
+    s->rx_start = 0;
+    s->rx_level = 0;
+}
+
+static const VMStateDescription vmstate_strongarm_ssp_regs = {
+    .name = "strongarm-ssp",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .minimum_version_id_old = 0,
+    .post_load = strongarm_ssp_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT16_ARRAY(sscr, StrongARMSSPState, 2),
+        VMSTATE_UINT16(sssr, StrongARMSSPState),
+        VMSTATE_UINT16_ARRAY(rx_fifo, StrongARMSSPState, 8),
+        VMSTATE_UINT8(rx_start, StrongARMSSPState),
+        VMSTATE_UINT8(rx_level, StrongARMSSPState),
+        VMSTATE_END_OF_LIST(),
+    },
+};
+
+static SysBusDeviceInfo strongarm_ssp_info = {
+    .init       = strongarm_ssp_init,
+    .qdev.name  = "strongarm-ssp",
+    .qdev.desc  = "StrongARM SSP controller",
+    .qdev.size  = sizeof(StrongARMSSPState),
+    .qdev.reset = strongarm_ssp_reset,
+    .qdev.vmsd  = &vmstate_strongarm_ssp_regs,
+};
+
+/* Main CPU functions */
+StrongARMState *sa1110_init(unsigned int sdram_size, const char *rev)
+{
+    StrongARMState *s;
+    qemu_irq *pic;
+    int i;
+
+    s = qemu_mallocz(sizeof(StrongARMState));
+
+    if (!rev) {
+        rev = "sa1110-b5";
+    }
+
+    if (strncmp(rev, "sa1110", 6)) {
+        error_report("Machine requires a SA1110 processor.\n");
+        exit(1);
+    }
+
+    s->env = cpu_init(rev);
+
+    if (!s->env) {
+        error_report("Unable to find CPU definition\n");
+        exit(1);
+    }
+
+    cpu_register_physical_memory(SA_SDCS0,
+                    sdram_size, qemu_ram_alloc(NULL, "strongarm.sdram",
+                                                sdram_size) | IO_MEM_RAM);
+
+    pic = arm_pic_init_cpu(s->env);
+    s->pic = sysbus_create_varargs("strongarm_pic", 0x90050000,
+                    pic[ARM_PIC_CPU_IRQ], pic[ARM_PIC_CPU_FIQ], NULL);
+
+    sysbus_create_varargs("pxa25x-timer", 0x90000000,
+                    qdev_get_gpio_in(s->pic, SA_PIC_OSTC0),
+                    qdev_get_gpio_in(s->pic, SA_PIC_OSTC1),
+                    qdev_get_gpio_in(s->pic, SA_PIC_OSTC2),
+                    qdev_get_gpio_in(s->pic, SA_PIC_OSTC3),
+                    NULL);
+
+    sysbus_create_simple("strongarm-rtc", 0x90010000,
+                    qdev_get_gpio_in(s->pic, SA_PIC_RTC_ALARM));
+
+    s->gpio = strongarm_gpio_init(0x90040000, s->pic);
+
+    s->ppc = sysbus_create_varargs("strongarm-ppc", 0x90060000, NULL);
+
+    for (i = 0; sa_serial[i].io_base; i++) {
+        DeviceState *dev = qdev_create(NULL, "strongarm-uart");
+        qdev_prop_set_chr(dev, "chardev", serial_hds[i]);
+        qdev_init_nofail(dev);
+        sysbus_mmio_map(sysbus_from_qdev(dev), 0,
+                sa_serial[i].io_base);
+        sysbus_connect_irq(sysbus_from_qdev(dev), 0,
+                qdev_get_gpio_in(s->pic, sa_serial[i].irq));
+    }
+
+    s->ssp = sysbus_create_varargs("strongarm-ssp", 0x80070000,
+                qdev_get_gpio_in(s->pic, SA_PIC_SSP), NULL);
+    s->ssp_bus = (SSIBus *)qdev_get_child_bus(s->ssp, "ssi");
+
+    return s;
+}
+
+static void strongarm_register_devices(void)
+{
+    sysbus_register_withprop(&strongarm_pic_info);
+    sysbus_register_withprop(&strongarm_rtc_sysbus_info);
+    sysbus_register_withprop(&strongarm_gpio_info);
+    sysbus_register_withprop(&strongarm_ppc_info);
+    sysbus_register_withprop(&strongarm_uart_info);
+    sysbus_register_withprop(&strongarm_ssp_info);
+}
+device_init(strongarm_register_devices)
diff --git a/hw/strongarm.h b/hw/strongarm.h
new file mode 100644
index 0000000..a81b110
--- /dev/null
+++ b/hw/strongarm.h
@@ -0,0 +1,64 @@
+#ifndef _STRONGARM_H
+#define _STRONGARM_H
+
+#define SA_CS0          0x00000000
+#define SA_CS1          0x08000000
+#define SA_CS2          0x10000000
+#define SA_CS3          0x18000000
+#define SA_PCMCIA_CS0   0x20000000
+#define SA_PCMCIA_CS1   0x30000000
+#define SA_CS4          0x40000000
+#define SA_CS5          0x48000000
+/* system registers here */
+#define SA_SDCS0        0xc0000000
+#define SA_SDCS1        0xc8000000
+#define SA_SDCS2        0xd0000000
+#define SA_SDCS3        0xd8000000
+
+enum {
+    SA_PIC_GPIO0_EDGE = 0,
+    SA_PIC_GPIO1_EDGE,
+    SA_PIC_GPIO2_EDGE,
+    SA_PIC_GPIO3_EDGE,
+    SA_PIC_GPIO4_EDGE,
+    SA_PIC_GPIO5_EDGE,
+    SA_PIC_GPIO6_EDGE,
+    SA_PIC_GPIO7_EDGE,
+    SA_PIC_GPIO8_EDGE,
+    SA_PIC_GPIO9_EDGE,
+    SA_PIC_GPIO10_EDGE,
+    SA_PIC_GPIOX_EDGE,
+    SA_PIC_LCD,
+    SA_PIC_UDC,
+    SA_PIC_RSVD1,
+    SA_PIC_UART1,
+    SA_PIC_UART2,
+    SA_PIC_UART3,
+    SA_PIC_MCP,
+    SA_PIC_SSP,
+    SA_PIC_DMA_CH0,
+    SA_PIC_DMA_CH1,
+    SA_PIC_DMA_CH2,
+    SA_PIC_DMA_CH3,
+    SA_PIC_DMA_CH4,
+    SA_PIC_DMA_CH5,
+    SA_PIC_OSTC0,
+    SA_PIC_OSTC1,
+    SA_PIC_OSTC2,
+    SA_PIC_OSTC3,
+    SA_PIC_RTC_HZ,
+    SA_PIC_RTC_ALARM,
+};
+
+typedef struct {
+    CPUState *env;
+    DeviceState *pic;
+    DeviceState *gpio;
+    DeviceState *ppc;
+    DeviceState *ssp;
+    SSIBus *ssp_bus;
+} StrongARMState;
+
+StrongARMState *sa1110_init(unsigned int sdram_size, const char *rev);
+
+#endif