hppa: add emulation of LASI PS2 controllers

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Message-Id: <20191220211512.3289-5-svens@stackframe.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

5 files changed, 305 insertions, 0 deletions

diff --git a/hw/input/Kconfig b/hw/input/Kconfig
index 287f088..25c77a1 100644
--- a/hw/input/Kconfig
+++ b/hw/input/Kconfig
@@ -41,3 +41,6 @@ config VHOST_USER_INPUT
 
 config TSC210X
     bool
+
+config LASIPS2
+    select PS2
diff --git a/hw/input/Makefile.objs b/hw/input/Makefile.objs
index a1bc502..f98f635 100644
--- a/hw/input/Makefile.objs
+++ b/hw/input/Makefile.objs
@@ -15,3 +15,4 @@ common-obj-$(CONFIG_VHOST_USER_INPUT) += vhost-user-input.o
 obj-$(CONFIG_MILKYMIST) += milkymist-softusb.o
 obj-$(CONFIG_PXA2XX) += pxa2xx_keypad.o
 obj-$(CONFIG_TSC210X) += tsc210x.o
+obj-$(CONFIG_LASIPS2) += lasips2.o
diff --git a/hw/input/lasips2.c b/hw/input/lasips2.c
new file mode 100644
index 0000000..0786e57
--- /dev/null
+++ b/hw/input/lasips2.c
@@ -0,0 +1,291 @@
+/*
+ * QEMU HP Lasi PS/2 interface emulation
+ *
+ * Copyright (c) 2019 Sven Schnelle
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "hw/qdev-properties.h"
+#include "hw/hw.h"
+#include "hw/input/ps2.h"
+#include "hw/input/lasips2.h"
+#include "hw/sysbus.h"
+#include "exec/hwaddr.h"
+#include "sysemu/sysemu.h"
+#include "trace.h"
+#include "exec/address-spaces.h"
+#include "migration/vmstate.h"
+#include "hw/irq.h"
+
+
+struct LASIPS2State;
+typedef struct LASIPS2Port {
+    struct LASIPS2State *parent;
+    MemoryRegion reg;
+    void *dev;
+    uint8_t id;
+    uint8_t control;
+    uint8_t buf;
+    bool loopback_rbne;
+    bool irq;
+} LASIPS2Port;
+
+typedef struct LASIPS2State {
+    LASIPS2Port kbd;
+    LASIPS2Port mouse;
+    qemu_irq irq;
+} LASIPS2State;
+
+static const VMStateDescription vmstate_lasips2 = {
+    .name = "lasips2",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT8(kbd.control, LASIPS2State),
+        VMSTATE_UINT8(kbd.id, LASIPS2State),
+        VMSTATE_BOOL(kbd.irq, LASIPS2State),
+        VMSTATE_UINT8(mouse.control, LASIPS2State),
+        VMSTATE_UINT8(mouse.id, LASIPS2State),
+        VMSTATE_BOOL(mouse.irq, LASIPS2State),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+typedef enum {
+    REG_PS2_ID = 0,
+    REG_PS2_RCVDATA = 4,
+    REG_PS2_CONTROL = 8,
+    REG_PS2_STATUS = 12,
+} lasips2_read_reg_t;
+
+typedef enum {
+    REG_PS2_RESET = 0,
+    REG_PS2_XMTDATA = 4,
+} lasips2_write_reg_t;
+
+typedef enum {
+    LASIPS2_CONTROL_ENABLE = 0x01,
+    LASIPS2_CONTROL_LOOPBACK = 0x02,
+    LASIPS2_CONTROL_DIAG = 0x20,
+    LASIPS2_CONTROL_DATDIR = 0x40,
+    LASIPS2_CONTROL_CLKDIR = 0x80,
+} lasips2_control_reg_t;
+
+typedef enum {
+    LASIPS2_STATUS_RBNE = 0x01,
+    LASIPS2_STATUS_TBNE = 0x02,
+    LASIPS2_STATUS_TERR = 0x04,
+    LASIPS2_STATUS_PERR = 0x08,
+    LASIPS2_STATUS_CMPINTR = 0x10,
+    LASIPS2_STATUS_DATSHD = 0x40,
+    LASIPS2_STATUS_CLKSHD = 0x80,
+} lasips2_status_reg_t;
+
+static const char *artist_read_reg_name(uint64_t addr)
+{
+    switch (addr & 0xc) {
+    case REG_PS2_ID:
+        return " PS2_ID";
+
+    case REG_PS2_RCVDATA:
+        return " PS2_RCVDATA";
+
+    case REG_PS2_CONTROL:
+        return " PS2_CONTROL";
+
+    case REG_PS2_STATUS:
+        return " PS2_STATUS";
+
+    default:
+        return "";
+    }
+}
+
+static const char *artist_write_reg_name(uint64_t addr)
+{
+    switch (addr & 0x0c) {
+    case REG_PS2_RESET:
+        return " PS2_RESET";
+
+    case REG_PS2_XMTDATA:
+        return " PS2_XMTDATA";
+
+    case REG_PS2_CONTROL:
+        return " PS2_CONTROL";
+
+    default:
+        return "";
+    }
+}
+
+static void lasips2_update_irq(LASIPS2State *s)
+{
+    trace_lasips2_intr(s->kbd.irq | s->mouse.irq);
+    qemu_set_irq(s->irq, s->kbd.irq | s->mouse.irq);
+}
+
+static void lasips2_reg_write(void *opaque, hwaddr addr, uint64_t val,
+                              unsigned size)
+{
+    LASIPS2Port *port = opaque;
+
+    trace_lasips2_reg_write(size, port->id, addr,
+                            artist_write_reg_name(addr), val);
+
+    switch (addr & 0xc) {
+    case REG_PS2_CONTROL:
+        port->control = val;
+        break;
+
+    case REG_PS2_XMTDATA:
+        if (port->control & LASIPS2_CONTROL_LOOPBACK) {
+            port->buf = val;
+            port->irq = true;
+            port->loopback_rbne = true;
+            lasips2_update_irq(port->parent);
+            break;
+        }
+
+        if (port->id) {
+            ps2_write_mouse(port->dev, val);
+        } else {
+            ps2_write_keyboard(port->dev, val);
+        }
+        break;
+
+    case REG_PS2_RESET:
+        break;
+
+    default:
+        qemu_log_mask(LOG_UNIMP, "%s: unknown register 0x%02" HWADDR_PRIx "\n",
+                      __func__, addr);
+        break;
+    }
+}
+
+static uint64_t lasips2_reg_read(void *opaque, hwaddr addr, unsigned size)
+{
+    LASIPS2Port *port = opaque;
+    uint64_t ret = 0;
+
+    switch (addr & 0xc) {
+    case REG_PS2_ID:
+        ret = port->id;
+        break;
+
+    case REG_PS2_RCVDATA:
+        if (port->control & LASIPS2_CONTROL_LOOPBACK) {
+            port->irq = false;
+            port->loopback_rbne = false;
+            lasips2_update_irq(port->parent);
+            ret = port->buf;
+            break;
+        }
+
+        ret = ps2_read_data(port->dev);
+        break;
+
+    case REG_PS2_CONTROL:
+        ret = port->control;
+        break;
+
+    case REG_PS2_STATUS:
+
+        ret = LASIPS2_STATUS_DATSHD | LASIPS2_STATUS_CLKSHD;
+
+        if (port->control & LASIPS2_CONTROL_DIAG) {
+            if (!(port->control & LASIPS2_CONTROL_DATDIR)) {
+                ret &= ~LASIPS2_STATUS_DATSHD;
+            }
+
+            if (!(port->control & LASIPS2_CONTROL_CLKDIR)) {
+                ret &= ~LASIPS2_STATUS_CLKSHD;
+            }
+        }
+
+        if (port->control & LASIPS2_CONTROL_LOOPBACK) {
+            if (port->loopback_rbne) {
+                ret |= LASIPS2_STATUS_RBNE;
+            }
+        } else {
+            if (!ps2_queue_empty(port->dev)) {
+                ret |= LASIPS2_STATUS_RBNE;
+            }
+        }
+
+        if (port->parent->kbd.irq || port->parent->mouse.irq) {
+            ret |= LASIPS2_STATUS_CMPINTR;
+        }
+        break;
+
+    default:
+        qemu_log_mask(LOG_UNIMP, "%s: unknown register 0x%02" HWADDR_PRIx "\n",
+                      __func__, addr);
+        break;
+    }
+    trace_lasips2_reg_read(size, port->id, addr,
+                           artist_read_reg_name(addr), ret);
+
+    return ret;
+}
+
+static const MemoryRegionOps lasips2_reg_ops = {
+    .read = lasips2_reg_read,
+    .write = lasips2_reg_write,
+    .impl = {
+        .min_access_size = 1,
+        .max_access_size = 4,
+    },
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void ps2dev_update_irq(void *opaque, int level)
+{
+    LASIPS2Port *port = opaque;
+    port->irq = level;
+    lasips2_update_irq(port->parent);
+}
+
+void lasips2_init(MemoryRegion *address_space,
+                  hwaddr base, qemu_irq irq)
+{
+    LASIPS2State *s;
+
+    s = g_malloc0(sizeof(LASIPS2State));
+
+    s->irq = irq;
+    s->mouse.id = 1;
+    s->kbd.parent = s;
+    s->mouse.parent = s;
+
+    vmstate_register(NULL, base, &vmstate_lasips2, s);
+
+    s->kbd.dev = ps2_kbd_init(ps2dev_update_irq, &s->kbd);
+    s->mouse.dev = ps2_mouse_init(ps2dev_update_irq, &s->mouse);
+
+    memory_region_init_io(&s->kbd.reg, NULL, &lasips2_reg_ops, &s->kbd,
+                          "lasips2-kbd", 0x100);
+    memory_region_add_subregion(address_space, base, &s->kbd.reg);
+
+    memory_region_init_io(&s->mouse.reg, NULL, &lasips2_reg_ops, &s->mouse,
+                          "lasips2-mouse", 0x100);
+    memory_region_add_subregion(address_space, base + 0x100, &s->mouse.reg);
+}
diff --git a/hw/input/ps2.c b/hw/input/ps2.c
index 0b671b6..f8746d2 100644
--- a/hw/input/ps2.c
+++ b/hw/input/ps2.c
@@ -192,6 +192,11 @@ static void ps2_reset_queue(PS2State *s)
     q->count = 0;
 }
 
+int ps2_queue_empty(PS2State *s)
+{
+    return s->queue.count == 0;
+}
+
 void ps2_queue_noirq(PS2State *s, int b)
 {
     PS2Queue *q = &s->queue;
diff --git a/hw/input/trace-events b/hw/input/trace-events
index cf072fa..a2888fd 100644
--- a/hw/input/trace-events
+++ b/hw/input/trace-events
@@ -53,3 +53,8 @@ tsc2005_sense(const char *state) "touchscreen sense %s"
 
 # virtio-input.c
 virtio_input_queue_full(void) "queue full"
+
+# lasips2.c
+lasips2_reg_read(unsigned int size, int id, uint64_t addr, const char *name, uint64_t val) "%u %d addr 0x%"PRIx64 "%s -> 0x%"PRIx64
+lasips2_reg_write(unsigned int size, int id, uint64_t addr, const char *name, uint64_t val) "%u %d addr 0x%"PRIx64 "%s <- 0x%"PRIx64
+lasips2_intr(unsigned int val) "%d"