misc: introduce new mos6522 VIA device and enable it for ppc builds

The MOS6522 VIA forms the bridge part of several Mac devices, including the
Mac via-cuda and via-pmu devices. Introduce a standard mos6522 device that
can be shared amongst multiple implementations.

This is effectively taking the 6522 parts out of cuda.c and turning them
into a separate device whilst also applying some style tidy-ups and including
a conversion to trace-events.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 152 insertions, 0 deletions

diff --git a/include/hw/misc/mos6522.h b/include/hw/misc/mos6522.h
new file mode 100644
index 0000000000..a53c161b00
--- /dev/null
+++ b/include/hw/misc/mos6522.h
@@ -0,0 +1,152 @@
+/*
+ * QEMU MOS6522 VIA emulation
+ *
+ * Copyright (c) 2004-2007 Fabrice Bellard
+ * Copyright (c) 2007 Jocelyn Mayer
+ * Copyright (c) 2018 Mark Cave-Ayland
+ *
+ * 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.
+ */
+
+#ifndef MOS6522_H
+#define MOS6522_H
+
+#include "exec/memory.h"
+#include "hw/sysbus.h"
+#include "hw/ide/internal.h"
+#include "hw/input/adb.h"
+
+/* Bits in ACR */
+#define SR_CTRL            0x1c    /* Shift register control bits */
+#define SR_EXT             0x0c    /* Shift on external clock */
+#define SR_OUT             0x10    /* Shift out if 1 */
+
+/* Bits in IFR and IER */
+#define IER_SET            0x80    /* set bits in IER */
+#define IER_CLR            0       /* clear bits in IER */
+
+#define CA2_INT            0x01
+#define CA1_INT            0x02
+#define SR_INT             0x04    /* Shift register full/empty */
+#define CB2_INT            0x08
+#define CB1_INT            0x10
+#define T2_INT             0x20    /* Timer 2 interrupt */
+#define T1_INT             0x40    /* Timer 1 interrupt */
+
+/* Bits in ACR */
+#define T1MODE             0xc0    /* Timer 1 mode */
+#define T1MODE_CONT        0x40    /*  continuous interrupts */
+
+/* VIA registers */
+#define VIA_REG_B       0x00
+#define VIA_REG_A       0x01
+#define VIA_REG_DIRB    0x02
+#define VIA_REG_DIRA    0x03
+#define VIA_REG_T1CL    0x04
+#define VIA_REG_T1CH    0x05
+#define VIA_REG_T1LL    0x06
+#define VIA_REG_T1LH    0x07
+#define VIA_REG_T2CL    0x08
+#define VIA_REG_T2CH    0x09
+#define VIA_REG_SR      0x0a
+#define VIA_REG_ACR     0x0b
+#define VIA_REG_PCR     0x0c
+#define VIA_REG_IFR     0x0d
+#define VIA_REG_IER     0x0e
+#define VIA_REG_ANH     0x0f
+
+/**
+ * MOS6522Timer:
+ * @counter_value: counter value at load time
+ */
+typedef struct MOS6522Timer {
+    int index;
+    uint16_t latch;
+    uint16_t counter_value;
+    int64_t load_time;
+    int64_t next_irq_time;
+    uint64_t frequency;
+    QEMUTimer *timer;
+} MOS6522Timer;
+
+/**
+ * MOS6522State:
+ * @b: B-side data
+ * @a: A-side data
+ * @dirb: B-side direction (1=output)
+ * @dira: A-side direction (1=output)
+ * @sr: Shift register
+ * @acr: Auxiliary control register
+ * @pcr: Peripheral control register
+ * @ifr: Interrupt flag register
+ * @ier: Interrupt enable register
+ * @anh: A-side data, no handshake
+ * @last_b: last value of B register
+ * @last_acr: last value of ACR register
+ */
+typedef struct MOS6522State {
+    /*< private >*/
+    SysBusDevice parent_obj;
+    /*< public >*/
+
+    MemoryRegion mem;
+    /* VIA registers */
+    uint8_t b;
+    uint8_t a;
+    uint8_t dirb;
+    uint8_t dira;
+    uint8_t sr;
+    uint8_t acr;
+    uint8_t pcr;
+    uint8_t ifr;
+    uint8_t ier;
+    uint8_t anh;
+
+    MOS6522Timer timers[2];
+    uint64_t frequency;
+
+    qemu_irq irq;
+} MOS6522State;
+
+#define TYPE_MOS6522 "mos6522"
+#define MOS6522(obj) OBJECT_CHECK(MOS6522State, (obj), TYPE_MOS6522)
+
+typedef struct MOS6522DeviceClass {
+    DeviceClass parent_class;
+
+    DeviceRealize parent_realize;
+    void (*set_sr_int)(MOS6522State *dev);
+    void (*portB_write)(MOS6522State *dev);
+    void (*portA_write)(MOS6522State *dev);
+    /* These are used to influence the CUDA MacOS timebase calibration */
+    uint64_t (*get_timer1_counter_value)(MOS6522State *dev, MOS6522Timer *ti);
+    uint64_t (*get_timer2_counter_value)(MOS6522State *dev, MOS6522Timer *ti);
+    uint64_t (*get_timer1_load_time)(MOS6522State *dev, MOS6522Timer *ti);
+    uint64_t (*get_timer2_load_time)(MOS6522State *dev, MOS6522Timer *ti);
+} MOS6522DeviceClass;
+
+#define MOS6522_DEVICE_CLASS(cls) \
+    OBJECT_CLASS_CHECK(MOS6522DeviceClass, (cls), TYPE_MOS6522)
+#define MOS6522_DEVICE_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(MOS6522DeviceClass, (obj), TYPE_MOS6522)
+
+uint64_t mos6522_read(void *opaque, hwaddr addr, unsigned size);
+void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size);
+
+#endif /* MOS6522_H */