[Qemu-devel] [PATCH v3 18/20] arm: add Faraday FTTSC010 touchscreen controller support

[Kuo-Jung Su]

From: Kuo-Jung Su <address@hidden>

The FTTSC010 provides two operation modes to sample
the analog input voltage.
  1. The manual operation mode needs to program
     and control the panel drivers by software
     step-by-step for the x-y position measurement.
  2. The auto-scan mode provides a periodic sampling
     method to convert the analog input.

This patch only implements the auto-scan mode.

Signed-off-by: Kuo-Jung Su <address@hidden>
---
 hw/arm/Makefile.objs  |    1 +
 hw/arm/faraday_a369.c |    3 +
 hw/arm/fttsc010.c     |  260 +++++++++++++++++++++++++++++++++++++++++++++++++
 hw/arm/fttsc010.h     |   23 +++++
 4 files changed, 287 insertions(+)
 create mode 100644 hw/arm/fttsc010.c
 create mode 100644 hw/arm/fttsc010.h

diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs
index 5175a9d..854c30a 100644
--- a/hw/arm/Makefile.objs
+++ b/hw/arm/Makefile.objs
@@ -50,3 +50,4 @@ obj-y += ftssp010.o
 obj-y += ftmac110.o
 obj-y += ftgmac100.o
 obj-y += ftlcdc200.o
+obj-y += fttsc010.o
diff --git a/hw/arm/faraday_a369.c b/hw/arm/faraday_a369.c
index 9100616..fd81e2b 100644
--- a/hw/arm/faraday_a369.c
+++ b/hw/arm/faraday_a369.c
@@ -193,6 +193,9 @@ a369_device_init(A369State *s)
                           pic[23], /* FIFO Under-Run */
                           pic[22], /* AHB Bus Error */
                           NULL);
+
+    /* fttsc010 */
+    sysbus_create_simple("fttsc010", 0x92400000, pic[19]);
 }
 
 static void
diff --git a/hw/arm/fttsc010.c b/hw/arm/fttsc010.c
new file mode 100644
index 0000000..7e5bcb0
--- /dev/null
+++ b/hw/arm/fttsc010.c
@@ -0,0 +1,260 @@
+/*
+ * Faraday FTTSC010 emulator.
+ *
+ * Copyright (c) 2012 Faraday Technology
+ * Written by Dante Su <address@hidden>
+ *
+ * This code is licensed under GNU GPL v2+.
+ */
+
+#include <hw/hw.h>
+#include <hw/sysbus.h>
+#include <hw/devices.h>
+#include <ui/console.h>
+#include <qemu/timer.h>
+#include <sysemu/sysemu.h>
+
+#include "fttsc010.h"
+
+#define X_AXIS_DMAX     3470
+#define X_AXIS_MIN      290
+#define Y_AXIS_DMAX     3450
+#define Y_AXIS_MIN      200
+
+#define ADS_XPOS(x, y)  \
+    (X_AXIS_MIN + ((X_AXIS_DMAX * (x)) >> 15))
+#define ADS_YPOS(x, y)  \
+    (Y_AXIS_MIN + ((Y_AXIS_DMAX * (y)) >> 15))
+#define ADS_Z1POS(x, y) \
+    (8)
+#define ADS_Z2POS(x, y) \
+    ((1600 + ADS_XPOS(x, y)) * ADS_Z1POS(x, y) / ADS_XPOS(x, y))
+
+#define TYPE_FTTSC010   "fttsc010"
+
+typedef struct Fttsc010State {
+    SysBusDevice busdev;
+    MemoryRegion iomem;
+    qemu_irq irq;
+
+    uint64_t interval;
+    QEMUTimer *qtimer;
+
+    int x, y;
+    int z1, z2;
+
+    /* HW registers */
+    uint32_t cr;
+    uint32_t isr;
+    uint32_t imr;
+    uint32_t csr;
+    uint32_t pfr;
+    uint32_t dcr;
+} Fttsc010State;
+
+#define FTTSC010(obj) \
+    OBJECT_CHECK(Fttsc010State, obj, TYPE_FTTSC010)
+
+static void fttsc010_update_irq(Fttsc010State *s)
+{
+    if (s->imr & s->isr) {
+        qemu_irq_raise(s->irq);
+    } else {
+        qemu_irq_lower(s->irq);
+    }
+}
+
+static uint64_t fttsc010_mem_read(void *opaque, hwaddr addr, unsigned size)
+{
+    Fttsc010State *s = FTTSC010(opaque);
+
+    switch (addr) {
+    case REG_CR:
+        return s->cr;
+    case REG_ISR:
+        return s->isr;
+    case REG_IMR:
+        return s->imr;
+    case REG_VER:
+        return 0x00010000;
+    case REG_CSR:
+        return s->csr;
+    case REG_PFR:
+        return s->pfr;
+    case REG_DCR:
+        return s->dcr;
+    case REG_XYR:
+        return (s->x & 0x0fff) | ((s->y & 0x0fff) << 16);
+    case REG_ZR:
+        return (s->z1 & 0x0fff) | ((s->z2 & 0x0fff) << 16);
+    default:
+        break;
+    }
+
+    return 0;
+}
+
+static void fttsc010_mem_write(void    *opaque,
+                               hwaddr   addr,
+                               uint64_t val,
+                               unsigned size)
+{
+    Fttsc010State *s = FTTSC010(opaque);
+
+    switch (addr) {
+    case REG_CR:
+        s->cr = (uint32_t)val;
+        if (s->cr & (3 << 30)) {
+            qemu_mod_timer(s->qtimer,
+                s->interval + qemu_get_clock_ns(vm_clock));
+        } else {
+            qemu_del_timer(s->qtimer);
+        }
+        break;
+    case REG_ISR:
+        s->isr &= ~((uint32_t)val);
+        fttsc010_update_irq(s);
+        break;
+    case REG_IMR:
+        s->imr = (uint32_t)val;
+        fttsc010_update_irq(s);
+        break;
+    case REG_CSR:
+        s->csr = (uint32_t)val;
+        break;
+    case REG_PFR:
+        s->pfr = (uint32_t)val;
+        break;
+    case REG_DCR:
+        s->dcr = (uint32_t)val;
+        break;
+    default:
+        break;
+    }
+}
+
+static const MemoryRegionOps fttsc010_ops = {
+    .read  = fttsc010_mem_read,
+    .write = fttsc010_mem_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void fttsc010_timer_tick(void *opaque)
+{
+    Fttsc010State *s = FTTSC010(opaque);
+
+    /* if auto-scan enabled */
+    if (s->cr & (3 << 30)) {
+        s->isr |= (1 << 10);
+        /* turn it off, when it's under one-shot mode */
+        if (s->cr & (1 << 30)) {
+            s->cr &= ~(1 << 30);
+        }
+    }
+
+    fttsc010_update_irq(s);
+
+    qemu_mod_timer(s->qtimer, s->interval + qemu_get_clock_ns(vm_clock));
+}
+
+static void fttsc010_touchscreen_event(void *opaque,
+                                       int   x,
+                                       int   y,
+                                       int   z,
+                                       int   buttons_state)
+{
+    Fttsc010State *s = FTTSC010(opaque);
+
+    if (buttons_state) {
+        x = 0x7fff - x;
+        s->x  = ADS_XPOS(x, y);
+        s->y  = ADS_YPOS(x, y);
+        s->z1 = ADS_Z1POS(x, y);
+        s->z2 = ADS_Z2POS(x, y);
+    } else {
+        s->z1 = 0;
+        s->z2 = 0;
+    }
+}
+
+static void fttsc010_reset(DeviceState *ds)
+{
+    SysBusDevice *busdev = SYS_BUS_DEVICE(ds);
+    Fttsc010State *s = FTTSC010(FROM_SYSBUS(Fttsc010State, busdev));
+
+    s->cr  = 0;
+    s->isr = 0;
+    s->imr = 0;
+    s->csr = 0;
+    s->pfr = 0;
+    s->dcr = 0;
+
+    s->x  = 0;
+    s->y  = 0;
+    s->z1 = 0;
+    s->z2 = 0;
+
+    qemu_irq_lower(s->irq);
+}
+
+static int fttsc010_init(SysBusDevice *dev)
+{
+    Fttsc010State *s = FTTSC010(FROM_SYSBUS(Fttsc010State, dev));
+
+    s->interval = (uint64_t)get_ticks_per_sec() >> 6;
+    s->qtimer   = qemu_new_timer_ns(vm_clock, fttsc010_timer_tick, s);
+
+    memory_region_init_io(&s->iomem,
+                          &fttsc010_ops,
+                          s,
+                          TYPE_FTTSC010,
+                          0x1000);
+    sysbus_init_mmio(dev, &s->iomem);
+    sysbus_init_irq(dev, &s->irq);
+
+    qemu_add_mouse_event_handler(fttsc010_touchscreen_event, s, 1,
+                    "QEMU FTTSC010-driven Touchscreen");
+
+    return 0;
+}
+
+static const VMStateDescription vmstate_fttsc010 = {
+    .name = TYPE_FTTSC010,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(cr, Fttsc010State),
+        VMSTATE_UINT32(isr, Fttsc010State),
+        VMSTATE_UINT32(imr, Fttsc010State),
+        VMSTATE_UINT32(csr, Fttsc010State),
+        VMSTATE_UINT32(pfr, Fttsc010State),
+        VMSTATE_UINT32(dcr, Fttsc010State),
+        VMSTATE_END_OF_LIST(),
+    }
+};
+
+static void fttsc010_class_init(ObjectClass *klass, void *data)
+{
+    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    k->init     = fttsc010_init;
+    dc->reset   = fttsc010_reset;
+    dc->vmsd    = &vmstate_fttsc010;
+    dc->no_user = 1;
+}
+
+static const TypeInfo fttsc010_info = {
+    .name          = TYPE_FTTSC010,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(Fttsc010State),
+    .class_init    = fttsc010_class_init,
+};
+
+static void fttsc010_register_types(void)
+{
+    type_register_static(&fttsc010_info);
+}
+
+type_init(fttsc010_register_types)
diff --git a/hw/arm/fttsc010.h b/hw/arm/fttsc010.h
new file mode 100644
index 0000000..10ae937
--- /dev/null
+++ b/hw/arm/fttsc010.h
@@ -0,0 +1,23 @@
+/*
+ * Faraday FTTSC010 touchscreen driver
+ *
+ * Copyright (C) 2012 Faraday Technology
+ * Written by Dante Su <address@hidden>
+ *
+ * This file is licensed under GNU GPL v2+.
+ */
+
+#ifndef HW_ARM_FTTSC010_H
+#define HW_ARM_FTTSC010_H
+
+#define REG_CR      0x00  /* Control Register */
+#define REG_ISR     0x04  /* Interrupt Status Register */
+#define REG_IMR     0x08  /* Interrupt Mask Register */
+#define REG_VER     0x0C  /* Version Register */
+#define REG_CSR     0x30  /* Clock & Sample Rate Register */
+#define REG_PFR     0x34  /* Panel Function Register */
+#define REG_DCR     0x38  /* Delay Control Register */
+#define REG_XYR     0x3C  /* Touchscreen X,Y-Axis Register */
+#define REG_ZR      0x4C  /* Touchscreen Z-Axis (Pressure) Register */
+
+#endif
-- 
1.7.9.5