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qemu/hw/misc/mac_via.c
Mark Cave-Ayland 30ca7eddc4 mac_via: remove VIA1 timer optimisations 
The original implementation of the Macintosh VIA devices in commit 6dca62a000
"hw/m68k: add VIA support" used timer optimisations to reduce high CPU usage on
the host when booting Linux. These optimisations worked by waiting until VIA1
port B was accessed before re-arming the timers.

The MacOS toolbox ROM constantly writes to VIA1 port B which calls
via1_one_second_update() and via1_sixty_hz_update() to calculate the new expiry
time, causing the timers to constantly reset and never fire. The effect of this
is that the Ticks (0x16a) global variable holding the number of 60Hz timer ticks
since reset is never incremented by the interrupt causing time to stand still.

Whilst the code was introduced as a performance optimisation, it is likely that
the high CPU usage was actually caused by the incorrect 60Hz timer interval
fixed in the previous patch. Remove the optimisation to keep everything simple
and enable the MacOS toolbox ROM to start keeping time.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210311100505.22596-8-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2021-03-16 21:41:37 +01:00

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/*
* QEMU m68k Macintosh VIA device support
*
* Copyright (c) 2011-2018 Laurent Vivier
* Copyright (c) 2018 Mark Cave-Ayland
*
* Some parts from hw/misc/macio/cuda.c
*
* Copyright (c) 2004-2007 Fabrice Bellard
* Copyright (c) 2007 Jocelyn Mayer
*
* some parts from linux-2.6.29, arch/m68k/include/asm/mac_via.h
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "migration/vmstate.h"
#include "hw/sysbus.h"
#include "hw/irq.h"
#include "qemu/timer.h"
#include "hw/misc/mac_via.h"
#include "hw/misc/mos6522.h"
#include "hw/input/adb.h"
#include "sysemu/runstate.h"
#include "qapi/error.h"
#include "qemu/cutils.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-properties-system.h"
#include "sysemu/block-backend.h"
#include "trace.h"
#include "qemu/log.h"
/*
* VIAs: There are two in every machine,
*/
#define VIA_SIZE (0x2000)
/*
* Not all of these are true post MacII I think.
* CSA: probably the ones CHRP marks as 'unused' change purposes
* when the IWM becomes the SWIM.
* http://www.rs6000.ibm.com/resource/technology/chrpio/via5.mak.html
* ftp://ftp.austin.ibm.com/pub/technology/spec/chrp/inwork/CHRP_IORef_1.0.pdf
*
* also, http://developer.apple.com/technotes/hw/hw_09.html claims the
* following changes for IIfx:
* VIA1A_vSccWrReq not available and that VIA1A_vSync has moved to an IOP.
* Also, "All of the functionality of VIA2 has been moved to other chips".
*/
#define VIA1A_vSccWrReq 0x80 /*
* SCC write. (input)
* [CHRP] SCC WREQ: Reflects the state of the
* Wait/Request pins from the SCC.
* [Macintosh Family Hardware]
* as CHRP on SE/30,II,IIx,IIcx,IIci.
* on IIfx, "0 means an active request"
*/
#define VIA1A_vRev8 0x40 /*
* Revision 8 board ???
* [CHRP] En WaitReqB: Lets the WaitReq_L
* signal from port B of the SCC appear on
* the PA7 input pin. Output.
* [Macintosh Family] On the SE/30, this
* is the bit to flip screen buffers.
* 0=alternate, 1=main.
* on II,IIx,IIcx,IIci,IIfx this is a bit
* for Rev ID. 0=II,IIx, 1=IIcx,IIci,IIfx
*/
#define VIA1A_vHeadSel 0x20 /*
* Head select for IWM.
* [CHRP] unused.
* [Macintosh Family] "Floppy disk
* state-control line SEL" on all but IIfx
*/
#define VIA1A_vOverlay 0x10 /*
* [Macintosh Family] On SE/30,II,IIx,IIcx
* this bit enables the "Overlay" address
* map in the address decoders as it is on
* reset for mapping the ROM over the reset
* vector. 1=use overlay map.
* On the IIci,IIfx it is another bit of the
* CPU ID: 0=normal IIci, 1=IIci with parity
* feature or IIfx.
* [CHRP] En WaitReqA: Lets the WaitReq_L
* signal from port A of the SCC appear
* on the PA7 input pin (CHRP). Output.
* [MkLinux] "Drive Select"
* (with 0x20 being 'disk head select')
*/
#define VIA1A_vSync 0x08 /*
* [CHRP] Sync Modem: modem clock select:
* 1: select the external serial clock to
* drive the SCC's /RTxCA pin.
* 0: Select the 3.6864MHz clock to drive
* the SCC cell.
* [Macintosh Family] Correct on all but IIfx
*/
/*
* Macintosh Family Hardware sez: bits 0-2 of VIA1A are volume control
* on Macs which had the PWM sound hardware. Reserved on newer models.
* On IIci,IIfx, bits 1-2 are the rest of the CPU ID:
* bit 2: 1=IIci, 0=IIfx
* bit 1: 1 on both IIci and IIfx.
* MkLinux sez bit 0 is 'burnin flag' in this case.
* CHRP sez: VIA1A bits 0-2 and 5 are 'unused': if programmed as
* inputs, these bits will read 0.
*/
#define VIA1A_vVolume 0x07 /* Audio volume mask for PWM */
#define VIA1A_CPUID0 0x02 /* CPU id bit 0 on RBV, others */
#define VIA1A_CPUID1 0x04 /* CPU id bit 0 on RBV, others */
#define VIA1A_CPUID2 0x10 /* CPU id bit 0 on RBV, others */
#define VIA1A_CPUID3 0x40 /* CPU id bit 0 on RBV, others */
/*
* Info on VIA1B is from Macintosh Family Hardware & MkLinux.
* CHRP offers no info.
*/
#define VIA1B_vSound 0x80 /*
* Sound enable (for compatibility with
* PWM hardware) 0=enabled.
* Also, on IIci w/parity, shows parity error
* 0=error, 1=OK.
*/
#define VIA1B_vMystery 0x40 /*
* On IIci, parity enable. 0=enabled,1=disabled
* On SE/30, vertical sync interrupt enable.
* 0=enabled. This vSync interrupt shows up
* as a slot $E interrupt.
*/
#define VIA1B_vADBS2 0x20 /* ADB state input bit 1 (unused on IIfx) */
#define VIA1B_vADBS1 0x10 /* ADB state input bit 0 (unused on IIfx) */
#define VIA1B_vADBInt 0x08 /* ADB interrupt 0=interrupt (unused on IIfx)*/
#define VIA1B_vRTCEnb 0x04 /* Enable Real time clock. 0=enabled. */
#define VIA1B_vRTCClk 0x02 /* Real time clock serial-clock line. */
#define VIA1B_vRTCData 0x01 /* Real time clock serial-data line. */
/*
* VIA2 A register is the interrupt lines raised off the nubus
* slots.
* The below info is from 'Macintosh Family Hardware.'
* MkLinux calls the 'IIci internal video IRQ' below the 'RBV slot 0 irq.'
* It also notes that the slot $9 IRQ is the 'Ethernet IRQ' and
* defines the 'Video IRQ' as 0x40 for the 'EVR' VIA work-alike.
* Perhaps OSS uses vRAM1 and vRAM2 for ADB.
*/
#define VIA2A_vRAM1 0x80 /* RAM size bit 1 (IIci: reserved) */
#define VIA2A_vRAM0 0x40 /* RAM size bit 0 (IIci: internal video IRQ) */
#define VIA2A_vIRQE 0x20 /* IRQ from slot $E */
#define VIA2A_vIRQD 0x10 /* IRQ from slot $D */
#define VIA2A_vIRQC 0x08 /* IRQ from slot $C */
#define VIA2A_vIRQB 0x04 /* IRQ from slot $B */
#define VIA2A_vIRQA 0x02 /* IRQ from slot $A */
#define VIA2A_vIRQ9 0x01 /* IRQ from slot $9 */
/*
* RAM size bits decoded as follows:
* bit1 bit0 size of ICs in bank A
* 0 0 256 kbit
* 0 1 1 Mbit
* 1 0 4 Mbit
* 1 1 16 Mbit
*/
/*
* Register B has the fun stuff in it
*/
#define VIA2B_vVBL 0x80 /*
* VBL output to VIA1 (60.15Hz) driven by
* timer T1.
* on IIci, parity test: 0=test mode.
* [MkLinux] RBV_PARODD: 1=odd,0=even.
*/
#define VIA2B_vSndJck 0x40 /*
* External sound jack status.
* 0=plug is inserted. On SE/30, always 0
*/
#define VIA2B_vTfr0 0x20 /* Transfer mode bit 0 ack from NuBus */
#define VIA2B_vTfr1 0x10 /* Transfer mode bit 1 ack from NuBus */
#define VIA2B_vMode32 0x08 /*
* 24/32bit switch - doubles as cache flush
* on II, AMU/PMMU control.
* if AMU, 0=24bit to 32bit translation
* if PMMU, 1=PMMU is accessing page table.
* on SE/30 tied low.
* on IIx,IIcx,IIfx, unused.
* on IIci/RBV, cache control. 0=flush cache.
*/
#define VIA2B_vPower 0x04 /*
* Power off, 0=shut off power.
* on SE/30 this signal sent to PDS card.
*/
#define VIA2B_vBusLk 0x02 /*
* Lock NuBus transactions, 0=locked.
* on SE/30 sent to PDS card.
*/
#define VIA2B_vCDis 0x01 /*
* Cache control. On IIci, 1=disable cache card
* on others, 0=disable processor's instruction
* and data caches.
*/
/* interrupt flags */
#define IRQ_SET 0x80
/* common */
#define VIA_IRQ_TIMER1 0x40
#define VIA_IRQ_TIMER2 0x20
/*
* Apple sez: http://developer.apple.com/technotes/ov/ov_04.html
* Another example of a valid function that has no ROM support is the use
* of the alternate video page for page-flipping animation. Since there
* is no ROM call to flip pages, it is necessary to go play with the
* right bit in the VIA chip (6522 Versatile Interface Adapter).
* [CSA: don't know which one this is, but it's one of 'em!]
*/
/*
* 6522 registers - see databook.
* CSA: Assignments for VIA1 confirmed from CHRP spec.
*/
/* partial address decode. 0xYYXX : XX part for RBV, YY part for VIA */
/* Note: 15 VIA regs, 8 RBV regs */
#define vBufB 0x0000 /* [VIA/RBV] Register B */
#define vBufAH 0x0200 /* [VIA only] Buffer A, with handshake. DON'T USE! */
#define vDirB 0x0400 /* [VIA only] Data Direction Register B. */
#define vDirA 0x0600 /* [VIA only] Data Direction Register A. */
#define vT1CL 0x0800 /* [VIA only] Timer one counter low. */
#define vT1CH 0x0a00 /* [VIA only] Timer one counter high. */
#define vT1LL 0x0c00 /* [VIA only] Timer one latches low. */
#define vT1LH 0x0e00 /* [VIA only] Timer one latches high. */
#define vT2CL 0x1000 /* [VIA only] Timer two counter low. */
#define vT2CH 0x1200 /* [VIA only] Timer two counter high. */
#define vSR 0x1400 /* [VIA only] Shift register. */
#define vACR 0x1600 /* [VIA only] Auxilary control register. */
#define vPCR 0x1800 /* [VIA only] Peripheral control register. */
/*
* CHRP sez never ever to *write* this.
* Mac family says never to *change* this.
* In fact we need to initialize it once at start.
*/
#define vIFR 0x1a00 /* [VIA/RBV] Interrupt flag register. */
#define vIER 0x1c00 /* [VIA/RBV] Interrupt enable register. */
#define vBufA 0x1e00 /* [VIA/RBV] register A (no handshake) */
/* from linux 2.6 drivers/macintosh/via-macii.c */
/* Bits in ACR */
#define VIA1ACR_vShiftCtrl 0x1c /* Shift register control bits */
#define VIA1ACR_vShiftExtClk 0x0c /* Shift on external clock */
#define VIA1ACR_vShiftOut 0x10 /* Shift out if 1 */
/*
* Apple Macintosh Family Hardware Refenece
* Table 19-10 ADB transaction states
*/
#define ADB_STATE_NEW 0
#define ADB_STATE_EVEN 1
#define ADB_STATE_ODD 2
#define ADB_STATE_IDLE 3
#define VIA1B_vADB_StateMask (VIA1B_vADBS1 | VIA1B_vADBS2)
#define VIA1B_vADB_StateShift 4
#define VIA_TIMER_FREQ (783360)
#define VIA_ADB_POLL_FREQ 50 /* XXX: not real */
/*
* Guide to the Macintosh Family Hardware ch. 12 "Displays" p. 401 gives the
* precise 60Hz interrupt frequency as ~60.15Hz with a period of 16625.8 us
*/
#define VIA_60HZ_TIMER_PERIOD_NS 16625800
/* VIA returns time offset from Jan 1, 1904, not 1970 */
#define RTC_OFFSET 2082844800
enum {
REG_0,
REG_1,
REG_2,
REG_3,
REG_TEST,
REG_WPROTECT,
REG_PRAM_ADDR,
REG_PRAM_ADDR_LAST = REG_PRAM_ADDR + 19,
REG_PRAM_SECT,
REG_PRAM_SECT_LAST = REG_PRAM_SECT + 7,
REG_INVALID,
REG_EMPTY = 0xff,
};
static void via1_sixty_hz_update(MOS6522Q800VIA1State *v1s)
{
/* 60 Hz irq */
v1s->next_sixty_hz = (qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
VIA_60HZ_TIMER_PERIOD_NS) /
VIA_60HZ_TIMER_PERIOD_NS * VIA_60HZ_TIMER_PERIOD_NS;
timer_mod(v1s->sixty_hz_timer, v1s->next_sixty_hz);
}
static void via1_one_second_update(MOS6522Q800VIA1State *v1s)
{
v1s->next_second = (qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 1000) /
1000 * 1000;
timer_mod(v1s->one_second_timer, v1s->next_second);
}
static void via1_sixty_hz(void *opaque)
{
MOS6522Q800VIA1State *v1s = opaque;
MOS6522State *s = MOS6522(v1s);
MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
s->ifr |= VIA1_IRQ_60HZ;
mdc->update_irq(s);
via1_sixty_hz_update(v1s);
}
static void via1_one_second(void *opaque)
{
MOS6522Q800VIA1State *v1s = opaque;
MOS6522State *s = MOS6522(v1s);
MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
s->ifr |= VIA1_IRQ_ONE_SECOND;
mdc->update_irq(s);
via1_one_second_update(v1s);
}
static void via1_irq_request(void *opaque, int irq, int level)
{
MOS6522Q800VIA1State *v1s = opaque;
MOS6522State *s = MOS6522(v1s);
MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
if (level) {
s->ifr |= 1 << irq;
} else {
s->ifr &= ~(1 << irq);
}
mdc->update_irq(s);
}
static void via2_irq_request(void *opaque, int irq, int level)
{
MOS6522Q800VIA2State *v2s = opaque;
MOS6522State *s = MOS6522(v2s);
MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(s);
if (level) {
s->ifr |= 1 << irq;
} else {
s->ifr &= ~(1 << irq);
}
mdc->update_irq(s);
}
static void pram_update(MacVIAState *m)
{
if (m->blk) {
if (blk_pwrite(m->blk, 0, m->mos6522_via1.PRAM,
sizeof(m->mos6522_via1.PRAM), 0) < 0) {
qemu_log("pram_update: cannot write to file\n");
}
}
}
/*
* RTC Commands
*
* Command byte Register addressed by the command
*
* z0000001 Seconds register 0 (lowest-order byte)
* z0000101 Seconds register 1
* z0001001 Seconds register 2
* z0001101 Seconds register 3 (highest-order byte)
* 00110001 Test register (write-only)
* 00110101 Write-Protect Register (write-only)
* z010aa01 RAM address 100aa ($10-$13) (first 20 bytes only)
* z1aaaa01 RAM address 0aaaa ($00-$0F) (first 20 bytes only)
* z0111aaa Extended memory designator and sector number
*
* For a read request, z=1, for a write z=0
* The letter a indicates bits whose value depend on what parameter
* RAM byte you want to address
*/
static int via1_rtc_compact_cmd(uint8_t value)
{
uint8_t read = value & 0x80;
value &= 0x7f;
/* the last 2 bits of a command byte must always be 0b01 ... */
if ((value & 0x78) == 0x38) {
/* except for the extended memory designator */
return read | (REG_PRAM_SECT + (value & 0x07));
}
if ((value & 0x03) == 0x01) {
value >>= 2;
if ((value & 0x1c) == 0) {
/* seconds registers */
return read | (REG_0 + (value & 0x03));
} else if ((value == 0x0c) && !read) {
return REG_TEST;
} else if ((value == 0x0d) && !read) {
return REG_WPROTECT;
} else if ((value & 0x1c) == 0x08) {
/* RAM address 0x10 to 0x13 */
return read | (REG_PRAM_ADDR + 0x10 + (value & 0x03));
} else if ((value & 0x43) == 0x41) {
/* RAM address 0x00 to 0x0f */
return read | (REG_PRAM_ADDR + (value & 0x0f));
}
}
return REG_INVALID;
}
static void via1_rtc_update(MacVIAState *m)
{
MOS6522Q800VIA1State *v1s = &m->mos6522_via1;
MOS6522State *s = MOS6522(v1s);
int cmd, sector, addr;
uint32_t time;
if (s->b & VIA1B_vRTCEnb) {
return;
}
if (s->dirb & VIA1B_vRTCData) {
/* send bits to the RTC */
if (!(v1s->last_b & VIA1B_vRTCClk) && (s->b & VIA1B_vRTCClk)) {
m->data_out <<= 1;
m->data_out |= s->b & VIA1B_vRTCData;
m->data_out_cnt++;
}
trace_via1_rtc_update_data_out(m->data_out_cnt, m->data_out);
} else {
trace_via1_rtc_update_data_in(m->data_in_cnt, m->data_in);
/* receive bits from the RTC */
if ((v1s->last_b & VIA1B_vRTCClk) &&
!(s->b & VIA1B_vRTCClk) &&
m->data_in_cnt) {
s->b = (s->b & ~VIA1B_vRTCData) |
((m->data_in >> 7) & VIA1B_vRTCData);
m->data_in <<= 1;
m->data_in_cnt--;
}
return;
}
if (m->data_out_cnt != 8) {
return;
}
m->data_out_cnt = 0;
trace_via1_rtc_internal_status(m->cmd, m->alt, m->data_out);
/* first byte: it's a command */
if (m->cmd == REG_EMPTY) {
cmd = via1_rtc_compact_cmd(m->data_out);
trace_via1_rtc_internal_cmd(cmd);
if (cmd == REG_INVALID) {
trace_via1_rtc_cmd_invalid(m->data_out);
return;
}
if (cmd & 0x80) { /* this is a read command */
switch (cmd & 0x7f) {
case REG_0...REG_3: /* seconds registers */
/*
* register 0 is lowest-order byte
* register 3 is highest-order byte
*/
time = m->tick_offset + (qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)
/ NANOSECONDS_PER_SECOND);
trace_via1_rtc_internal_time(time);
m->data_in = (time >> ((cmd & 0x03) << 3)) & 0xff;
m->data_in_cnt = 8;
trace_via1_rtc_cmd_seconds_read((cmd & 0x7f) - REG_0,
m->data_in);
break;
case REG_PRAM_ADDR...REG_PRAM_ADDR_LAST:
/* PRAM address 0x00 -> 0x13 */
m->data_in = v1s->PRAM[(cmd & 0x7f) - REG_PRAM_ADDR];
m->data_in_cnt = 8;
trace_via1_rtc_cmd_pram_read((cmd & 0x7f) - REG_PRAM_ADDR,
m->data_in);
break;
case REG_PRAM_SECT...REG_PRAM_SECT_LAST:
/*
* extended memory designator and sector number
* the only two-byte read command
*/
trace_via1_rtc_internal_set_cmd(cmd);
m->cmd = cmd;
break;
default:
g_assert_not_reached();
break;
}
return;
}
/* this is a write command, needs a parameter */
if (cmd == REG_WPROTECT || !m->wprotect) {
trace_via1_rtc_internal_set_cmd(cmd);
m->cmd = cmd;
} else {
trace_via1_rtc_internal_ignore_cmd(cmd);
}
return;
}
/* second byte: it's a parameter */
if (m->alt == REG_EMPTY) {
switch (m->cmd & 0x7f) {
case REG_0...REG_3: /* seconds register */
/* FIXME */
trace_via1_rtc_cmd_seconds_write(m->cmd - REG_0, m->data_out);
m->cmd = REG_EMPTY;
break;
case REG_TEST:
/* device control: nothing to do */
trace_via1_rtc_cmd_test_write(m->data_out);
m->cmd = REG_EMPTY;
break;
case REG_WPROTECT:
/* Write Protect register */
trace_via1_rtc_cmd_wprotect_write(m->data_out);
m->wprotect = !!(m->data_out & 0x80);
m->cmd = REG_EMPTY;
break;
case REG_PRAM_ADDR...REG_PRAM_ADDR_LAST:
/* PRAM address 0x00 -> 0x13 */
trace_via1_rtc_cmd_pram_write(m->cmd - REG_PRAM_ADDR, m->data_out);
v1s->PRAM[m->cmd - REG_PRAM_ADDR] = m->data_out;
pram_update(m);
m->cmd = REG_EMPTY;
break;
case REG_PRAM_SECT...REG_PRAM_SECT_LAST:
addr = (m->data_out >> 2) & 0x1f;
sector = (m->cmd & 0x7f) - REG_PRAM_SECT;
if (m->cmd & 0x80) {
/* it's a read */
m->data_in = v1s->PRAM[sector * 32 + addr];
m->data_in_cnt = 8;
trace_via1_rtc_cmd_pram_sect_read(sector, addr,
sector * 32 + addr,
m->data_in);
m->cmd = REG_EMPTY;
} else {
/* it's a write, we need one more parameter */
trace_via1_rtc_internal_set_alt(addr, sector, addr);
m->alt = addr;
}
break;
default:
g_assert_not_reached();
break;
}
return;
}
/* third byte: it's the data of a REG_PRAM_SECT write */
g_assert(REG_PRAM_SECT <= m->cmd && m->cmd <= REG_PRAM_SECT_LAST);
sector = m->cmd - REG_PRAM_SECT;
v1s->PRAM[sector * 32 + m->alt] = m->data_out;
pram_update(m);
trace_via1_rtc_cmd_pram_sect_write(sector, m->alt, sector * 32 + m->alt,
m->data_out);
m->alt = REG_EMPTY;
m->cmd = REG_EMPTY;
}
static void adb_via_poll(void *opaque)
{
MacVIAState *m = opaque;
MOS6522Q800VIA1State *v1s = MOS6522_Q800_VIA1(&m->mos6522_via1);
MOS6522State *s = MOS6522(v1s);
ADBBusState *adb_bus = &m->adb_bus;
uint8_t obuf[9];
uint8_t *data = &s->sr;
int olen;
/*
* Setting vADBInt below indicates that an autopoll reply has been
* received, however we must block autopoll until the point where
* the entire reply has been read back to the host
*/
adb_autopoll_block(adb_bus);
if (m->adb_data_in_size > 0 && m->adb_data_in_index == 0) {
/*
* For older Linux kernels that switch to IDLE mode after sending the
* ADB command, detect if there is an existing response and return that
* as a a "fake" autopoll reply or bus timeout accordingly
*/
*data = m->adb_data_out[0];
olen = m->adb_data_in_size;
s->b &= ~VIA1B_vADBInt;
qemu_irq_raise(m->adb_data_ready);
} else {
/*
* Otherwise poll as normal
*/
m->adb_data_in_index = 0;
m->adb_data_out_index = 0;
olen = adb_poll(adb_bus, obuf, adb_bus->autopoll_mask);
if (olen > 0) {
/* Autopoll response */
*data = obuf[0];
olen--;
memcpy(m->adb_data_in, &obuf[1], olen);
m->adb_data_in_size = olen;
s->b &= ~VIA1B_vADBInt;
qemu_irq_raise(m->adb_data_ready);
} else {
*data = m->adb_autopoll_cmd;
obuf[0] = 0xff;
obuf[1] = 0xff;
olen = 2;
memcpy(m->adb_data_in, obuf, olen);
m->adb_data_in_size = olen;
s->b &= ~VIA1B_vADBInt;
qemu_irq_raise(m->adb_data_ready);
}
}
trace_via1_adb_poll(*data, (s->b & VIA1B_vADBInt) ? "+" : "-",
adb_bus->status, m->adb_data_in_index, olen);
}
static int adb_via_send_len(uint8_t data)
{
/* Determine the send length from the given ADB command */
uint8_t cmd = data & 0xc;
uint8_t reg = data & 0x3;
switch (cmd) {
case 0x8:
/* Listen command */
switch (reg) {
case 2:
/* Register 2 is only used for the keyboard */
return 3;
case 3:
/*
* Fortunately our devices only implement writes
* to register 3 which is fixed at 2 bytes
*/
return 3;
default:
qemu_log_mask(LOG_UNIMP, "ADB unknown length for register %d\n",
reg);
return 1;
}
default:
/* Talk, BusReset */
return 1;
}
}
static void adb_via_send(MacVIAState *s, int state, uint8_t data)
{
MOS6522Q800VIA1State *v1s = MOS6522_Q800_VIA1(&s->mos6522_via1);
MOS6522State *ms = MOS6522(v1s);
ADBBusState *adb_bus = &s->adb_bus;
uint16_t autopoll_mask;
switch (state) {
case ADB_STATE_NEW:
/*
* Command byte: vADBInt tells host autopoll data already present
* in VIA shift register and ADB transceiver
*/
adb_autopoll_block(adb_bus);
if (adb_bus->status & ADB_STATUS_POLLREPLY) {
/* Tell the host the existing data is from autopoll */
ms->b &= ~VIA1B_vADBInt;
} else {
ms->b |= VIA1B_vADBInt;
s->adb_data_out_index = 0;
s->adb_data_out[s->adb_data_out_index++] = data;
}
trace_via1_adb_send(" NEW", data, (ms->b & VIA1B_vADBInt) ? "+" : "-");
qemu_irq_raise(s->adb_data_ready);
break;
case ADB_STATE_EVEN:
case ADB_STATE_ODD:
ms->b |= VIA1B_vADBInt;
s->adb_data_out[s->adb_data_out_index++] = data;
trace_via1_adb_send(state == ADB_STATE_EVEN ? "EVEN" : " ODD",
data, (ms->b & VIA1B_vADBInt) ? "+" : "-");
qemu_irq_raise(s->adb_data_ready);
break;
case ADB_STATE_IDLE:
return;
}
/* If the command is complete, execute it */
if (s->adb_data_out_index == adb_via_send_len(s->adb_data_out[0])) {
s->adb_data_in_size = adb_request(adb_bus, s->adb_data_in,
s->adb_data_out,
s->adb_data_out_index);
s->adb_data_in_index = 0;
if (adb_bus->status & ADB_STATUS_BUSTIMEOUT) {
/*
* Bus timeout (but allow first EVEN and ODD byte to indicate
* timeout via vADBInt and SRQ status)
*/
s->adb_data_in[0] = 0xff;
s->adb_data_in[1] = 0xff;
s->adb_data_in_size = 2;
}
/*
* If last command is TALK, store it for use by autopoll and adjust
* the autopoll mask accordingly
*/
if ((s->adb_data_out[0] & 0xc) == 0xc) {
s->adb_autopoll_cmd = s->adb_data_out[0];
autopoll_mask = 1 << (s->adb_autopoll_cmd >> 4);
adb_set_autopoll_mask(adb_bus, autopoll_mask);
}
}
}
static void adb_via_receive(MacVIAState *s, int state, uint8_t *data)
{
MOS6522Q800VIA1State *v1s = MOS6522_Q800_VIA1(&s->mos6522_via1);
MOS6522State *ms = MOS6522(v1s);
ADBBusState *adb_bus = &s->adb_bus;
uint16_t pending;
switch (state) {
case ADB_STATE_NEW:
ms->b |= VIA1B_vADBInt;
return;
case ADB_STATE_IDLE:
ms->b |= VIA1B_vADBInt;
adb_autopoll_unblock(adb_bus);
trace_via1_adb_receive("IDLE", *data,
(ms->b & VIA1B_vADBInt) ? "+" : "-", adb_bus->status,
s->adb_data_in_index, s->adb_data_in_size);
break;
case ADB_STATE_EVEN:
case ADB_STATE_ODD:
switch (s->adb_data_in_index) {
case 0:
/* First EVEN byte: vADBInt indicates bus timeout */
*data = s->adb_data_in[s->adb_data_in_index];
if (adb_bus->status & ADB_STATUS_BUSTIMEOUT) {
ms->b &= ~VIA1B_vADBInt;
} else {
ms->b |= VIA1B_vADBInt;
}
trace_via1_adb_receive(state == ADB_STATE_EVEN ? "EVEN" : " ODD",
*data, (ms->b & VIA1B_vADBInt) ? "+" : "-",
adb_bus->status, s->adb_data_in_index,
s->adb_data_in_size);
s->adb_data_in_index++;
break;
case 1:
/* First ODD byte: vADBInt indicates SRQ */
*data = s->adb_data_in[s->adb_data_in_index];
pending = adb_bus->pending & ~(1 << (s->adb_autopoll_cmd >> 4));
if (pending) {
ms->b &= ~VIA1B_vADBInt;
} else {
ms->b |= VIA1B_vADBInt;
}
trace_via1_adb_receive(state == ADB_STATE_EVEN ? "EVEN" : " ODD",
*data, (ms->b & VIA1B_vADBInt) ? "+" : "-",
adb_bus->status, s->adb_data_in_index,
s->adb_data_in_size);
s->adb_data_in_index++;
break;
default:
/*
* Otherwise vADBInt indicates end of data. Note that Linux
* specifically checks for the sequence 0x0 0xff to confirm the
* end of the poll reply, so provide these extra bytes below to
* keep it happy
*/
if (s->adb_data_in_index < s->adb_data_in_size) {
/* Next data byte */
*data = s->adb_data_in[s->adb_data_in_index];
ms->b |= VIA1B_vADBInt;
} else if (s->adb_data_in_index == s->adb_data_in_size) {
if (adb_bus->status & ADB_STATUS_BUSTIMEOUT) {
/* Bus timeout (no more data) */
*data = 0xff;
} else {
/* Return 0x0 after reply */
*data = 0;
}
ms->b &= ~VIA1B_vADBInt;
} else {
/* Bus timeout (no more data) */
*data = 0xff;
ms->b &= ~VIA1B_vADBInt;
adb_bus->status = 0;
adb_autopoll_unblock(adb_bus);
}
trace_via1_adb_receive(state == ADB_STATE_EVEN ? "EVEN" : " ODD",
*data, (ms->b & VIA1B_vADBInt) ? "+" : "-",
adb_bus->status, s->adb_data_in_index,
s->adb_data_in_size);
if (s->adb_data_in_index <= s->adb_data_in_size) {
s->adb_data_in_index++;
}
break;
}
qemu_irq_raise(s->adb_data_ready);
break;
}
}
static void via1_adb_update(MacVIAState *m)
{
MOS6522Q800VIA1State *v1s = MOS6522_Q800_VIA1(&m->mos6522_via1);
MOS6522State *s = MOS6522(v1s);
int oldstate, state;
oldstate = (v1s->last_b & VIA1B_vADB_StateMask) >> VIA1B_vADB_StateShift;
state = (s->b & VIA1B_vADB_StateMask) >> VIA1B_vADB_StateShift;
if (state != oldstate) {
if (s->acr & VIA1ACR_vShiftOut) {
/* output mode */
adb_via_send(m, state, s->sr);
} else {
/* input mode */
adb_via_receive(m, state, &s->sr);
}
}
}
static uint64_t mos6522_q800_via1_read(void *opaque, hwaddr addr, unsigned size)
{
MOS6522Q800VIA1State *s = MOS6522_Q800_VIA1(opaque);
MOS6522State *ms = MOS6522(s);
addr = (addr >> 9) & 0xf;
return mos6522_read(ms, addr, size);
}
static void mos6522_q800_via1_write(void *opaque, hwaddr addr, uint64_t val,
unsigned size)
{
MOS6522Q800VIA1State *v1s = MOS6522_Q800_VIA1(opaque);
MacVIAState *m = container_of(v1s, MacVIAState, mos6522_via1);
MOS6522State *ms = MOS6522(v1s);
addr = (addr >> 9) & 0xf;
mos6522_write(ms, addr, val, size);
switch (addr) {
case VIA_REG_B:
via1_rtc_update(m);
via1_adb_update(m);
v1s->last_b = ms->b;
break;
}
}
static const MemoryRegionOps mos6522_q800_via1_ops = {
.read = mos6522_q800_via1_read,
.write = mos6522_q800_via1_write,
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
},
};
static uint64_t mos6522_q800_via2_read(void *opaque, hwaddr addr, unsigned size)
{
MOS6522Q800VIA2State *s = MOS6522_Q800_VIA2(opaque);
MOS6522State *ms = MOS6522(s);
addr = (addr >> 9) & 0xf;
return mos6522_read(ms, addr, size);
}
static void mos6522_q800_via2_write(void *opaque, hwaddr addr, uint64_t val,
unsigned size)
{
MOS6522Q800VIA2State *s = MOS6522_Q800_VIA2(opaque);
MOS6522State *ms = MOS6522(s);
addr = (addr >> 9) & 0xf;
mos6522_write(ms, addr, val, size);
}
static const MemoryRegionOps mos6522_q800_via2_ops = {
.read = mos6522_q800_via2_read,
.write = mos6522_q800_via2_write,
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
},
};
static void mac_via_reset(DeviceState *dev)
{
MacVIAState *m = MAC_VIA(dev);
ADBBusState *adb_bus = &m->adb_bus;
adb_set_autopoll_enabled(adb_bus, true);
m->cmd = REG_EMPTY;
m->alt = REG_EMPTY;
}
static void mac_via_realize(DeviceState *dev, Error **errp)
{
MacVIAState *m = MAC_VIA(dev);
MOS6522State *ms;
ADBBusState *adb_bus = &m->adb_bus;
struct tm tm;
int ret;
/* Init VIAs 1 and 2 */
object_initialize_child(OBJECT(dev), "via1", &m->mos6522_via1,
TYPE_MOS6522_Q800_VIA1);
object_initialize_child(OBJECT(dev), "via2", &m->mos6522_via2,
TYPE_MOS6522_Q800_VIA2);
/* Pass through mos6522 output IRQs */
ms = MOS6522(&m->mos6522_via1);
object_property_add_alias(OBJECT(dev), "irq[0]", OBJECT(ms),
SYSBUS_DEVICE_GPIO_IRQ "[0]");
ms = MOS6522(&m->mos6522_via2);
object_property_add_alias(OBJECT(dev), "irq[1]", OBJECT(ms),
SYSBUS_DEVICE_GPIO_IRQ "[0]");
sysbus_realize(SYS_BUS_DEVICE(&m->mos6522_via1), &error_abort);
sysbus_realize(SYS_BUS_DEVICE(&m->mos6522_via2), &error_abort);
/* Pass through mos6522 input IRQs */
qdev_pass_gpios(DEVICE(&m->mos6522_via1), dev, "via1-irq");
qdev_pass_gpios(DEVICE(&m->mos6522_via2), dev, "via2-irq");
/* VIA 1 */
m->mos6522_via1.one_second_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
via1_one_second,
&m->mos6522_via1);
via1_one_second_update(&m->mos6522_via1);
m->mos6522_via1.sixty_hz_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
via1_sixty_hz,
&m->mos6522_via1);
via1_sixty_hz_update(&m->mos6522_via1);
qemu_get_timedate(&tm, 0);
m->tick_offset = (uint32_t)mktimegm(&tm) + RTC_OFFSET;
adb_register_autopoll_callback(adb_bus, adb_via_poll, m);
m->adb_data_ready = qdev_get_gpio_in_named(dev, "via1-irq",
VIA1_IRQ_ADB_READY_BIT);
if (m->blk) {
int64_t len = blk_getlength(m->blk);
if (len < 0) {
error_setg_errno(errp, -len,
"could not get length of backing image");
return;
}
ret = blk_set_perm(m->blk,
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE,
BLK_PERM_ALL, errp);
if (ret < 0) {
return;
}
len = blk_pread(m->blk, 0, m->mos6522_via1.PRAM,
sizeof(m->mos6522_via1.PRAM));
if (len != sizeof(m->mos6522_via1.PRAM)) {
error_setg(errp, "can't read PRAM contents");
return;
}
}
}
static void mac_via_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
MacVIAState *m = MAC_VIA(obj);
/* MMIO */
memory_region_init(&m->mmio, obj, "mac-via", 2 * VIA_SIZE);
sysbus_init_mmio(sbd, &m->mmio);
memory_region_init_io(&m->via1mem, obj, &mos6522_q800_via1_ops,
&m->mos6522_via1, "via1", VIA_SIZE);
memory_region_add_subregion(&m->mmio, 0x0, &m->via1mem);
memory_region_init_io(&m->via2mem, obj, &mos6522_q800_via2_ops,
&m->mos6522_via2, "via2", VIA_SIZE);
memory_region_add_subregion(&m->mmio, VIA_SIZE, &m->via2mem);
/* ADB */
qbus_create_inplace((BusState *)&m->adb_bus, sizeof(m->adb_bus),
TYPE_ADB_BUS, DEVICE(obj), "adb.0");
}
static void postload_update_cb(void *opaque, bool running, RunState state)
{
MacVIAState *m = MAC_VIA(opaque);
qemu_del_vm_change_state_handler(m->vmstate);
m->vmstate = NULL;
pram_update(m);
}
static int mac_via_post_load(void *opaque, int version_id)
{
MacVIAState *m = MAC_VIA(opaque);
if (m->blk) {
m->vmstate = qemu_add_vm_change_state_handler(postload_update_cb,
m);
}
return 0;
}
static const VMStateDescription vmstate_mac_via = {
.name = "mac-via",
.version_id = 2,
.minimum_version_id = 2,
.post_load = mac_via_post_load,
.fields = (VMStateField[]) {
/* VIAs */
VMSTATE_STRUCT(mos6522_via1.parent_obj, MacVIAState, 0, vmstate_mos6522,
MOS6522State),
VMSTATE_UINT8(mos6522_via1.last_b, MacVIAState),
VMSTATE_BUFFER(mos6522_via1.PRAM, MacVIAState),
VMSTATE_TIMER_PTR(mos6522_via1.one_second_timer, MacVIAState),
VMSTATE_INT64(mos6522_via1.next_second, MacVIAState),
VMSTATE_TIMER_PTR(mos6522_via1.sixty_hz_timer, MacVIAState),
VMSTATE_INT64(mos6522_via1.next_sixty_hz, MacVIAState),
VMSTATE_STRUCT(mos6522_via2.parent_obj, MacVIAState, 0, vmstate_mos6522,
MOS6522State),
/* RTC */
VMSTATE_UINT32(tick_offset, MacVIAState),
VMSTATE_UINT8(data_out, MacVIAState),
VMSTATE_INT32(data_out_cnt, MacVIAState),
VMSTATE_UINT8(data_in, MacVIAState),
VMSTATE_UINT8(data_in_cnt, MacVIAState),
VMSTATE_UINT8(cmd, MacVIAState),
VMSTATE_INT32(wprotect, MacVIAState),
VMSTATE_INT32(alt, MacVIAState),
/* ADB */
VMSTATE_INT32(adb_data_in_size, MacVIAState),
VMSTATE_INT32(adb_data_in_index, MacVIAState),
VMSTATE_INT32(adb_data_out_index, MacVIAState),
VMSTATE_BUFFER(adb_data_in, MacVIAState),
VMSTATE_BUFFER(adb_data_out, MacVIAState),
VMSTATE_UINT8(adb_autopoll_cmd, MacVIAState),
VMSTATE_END_OF_LIST()
}
};
static Property mac_via_properties[] = {
DEFINE_PROP_DRIVE("drive", MacVIAState, blk),
DEFINE_PROP_END_OF_LIST(),
};
static void mac_via_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->realize = mac_via_realize;
dc->reset = mac_via_reset;
dc->vmsd = &vmstate_mac_via;
device_class_set_props(dc, mac_via_properties);
}
static TypeInfo mac_via_info = {
.name = TYPE_MAC_VIA,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(MacVIAState),
.instance_init = mac_via_init,
.class_init = mac_via_class_init,
};
/* VIA 1 */
static void mos6522_q800_via1_reset(DeviceState *dev)
{
MOS6522State *ms = MOS6522(dev);
MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(ms);
mdc->parent_reset(dev);
ms->timers[0].frequency = VIA_TIMER_FREQ;
ms->timers[1].frequency = VIA_TIMER_FREQ;
ms->b = VIA1B_vADB_StateMask | VIA1B_vADBInt | VIA1B_vRTCEnb;
}
static void mos6522_q800_via1_init(Object *obj)
{
qdev_init_gpio_in_named(DEVICE(obj), via1_irq_request, "via1-irq",
VIA1_IRQ_NB);
}
static void mos6522_q800_via1_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->reset = mos6522_q800_via1_reset;
}
static const TypeInfo mos6522_q800_via1_type_info = {
.name = TYPE_MOS6522_Q800_VIA1,
.parent = TYPE_MOS6522,
.instance_size = sizeof(MOS6522Q800VIA1State),
.instance_init = mos6522_q800_via1_init,
.class_init = mos6522_q800_via1_class_init,
};
/* VIA 2 */
static void mos6522_q800_via2_portB_write(MOS6522State *s)
{
if (s->dirb & VIA2B_vPower && (s->b & VIA2B_vPower) == 0) {
/* shutdown */
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
}
}
static void mos6522_q800_via2_reset(DeviceState *dev)
{
MOS6522State *ms = MOS6522(dev);
MOS6522DeviceClass *mdc = MOS6522_GET_CLASS(ms);
mdc->parent_reset(dev);
ms->timers[0].frequency = VIA_TIMER_FREQ;
ms->timers[1].frequency = VIA_TIMER_FREQ;
ms->dirb = 0;
ms->b = 0;
}
static void mos6522_q800_via2_init(Object *obj)
{
qdev_init_gpio_in_named(DEVICE(obj), via2_irq_request, "via2-irq",
VIA2_IRQ_NB);
}
static void mos6522_q800_via2_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
MOS6522DeviceClass *mdc = MOS6522_CLASS(oc);
dc->reset = mos6522_q800_via2_reset;
mdc->portB_write = mos6522_q800_via2_portB_write;
}
static const TypeInfo mos6522_q800_via2_type_info = {
.name = TYPE_MOS6522_Q800_VIA2,
.parent = TYPE_MOS6522,
.instance_size = sizeof(MOS6522Q800VIA2State),
.instance_init = mos6522_q800_via2_init,
.class_init = mos6522_q800_via2_class_init,
};
static void mac_via_register_types(void)
{
type_register_static(&mos6522_q800_via1_type_info);
type_register_static(&mos6522_q800_via2_type_info);
type_register_static(&mac_via_info);
}
type_init(mac_via_register_types);
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