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https://github.com/torvalds/linux
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da3fb3c9aa
The IOP driver calls into the OSS driver to enable its IRQ. This undesirable coupling between drivers only exists because the OSS driver doesn't correctly handle all of its machspec IRQs. Fix OSS handling of enable/disable for VIA1 IRQs (8 thru 15) which includes MAC_IRQ_ADB. Back when I implemented pmac_zilog support I redefined IRQ_MAC_SCC incorrectly. Change this to a machspec IRQ so that it works on OSS. Clean up the unused OSS audio IRQ and OSS_IRQLEV_* cruft that only confuses things. Fix the OSS description in macints.c and remove an obsolete comment. Don't enable the VIA1 irq before registering the handler. Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
340 lines
8.2 KiB
C
340 lines
8.2 KiB
C
/*
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* Macintosh interrupts
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*
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* General design:
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* In contrary to the Amiga and Atari platforms, the Mac hardware seems to
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* exclusively use the autovector interrupts (the 'generic level0-level7'
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* interrupts with exception vectors 0x19-0x1f). The following interrupt levels
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* are used:
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* 1 - VIA1
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* - slot 0: one second interrupt (CA2)
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* - slot 1: VBlank (CA1)
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* - slot 2: ADB data ready (SR full)
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* - slot 3: ADB data (CB2)
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* - slot 4: ADB clock (CB1)
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* - slot 5: timer 2
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* - slot 6: timer 1
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* - slot 7: status of IRQ; signals 'any enabled int.'
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*
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* 2 - VIA2 or RBV
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* - slot 0: SCSI DRQ (CA2)
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* - slot 1: NUBUS IRQ (CA1) need to read port A to find which
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* - slot 2: /EXP IRQ (only on IIci)
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* - slot 3: SCSI IRQ (CB2)
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* - slot 4: ASC IRQ (CB1)
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* - slot 5: timer 2 (not on IIci)
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* - slot 6: timer 1 (not on IIci)
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* - slot 7: status of IRQ; signals 'any enabled int.'
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*
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* Levels 3-6 vary by machine type. For VIA or RBV Macintoshes:
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*
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* 3 - unused (?)
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*
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* 4 - SCC
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*
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* 5 - unused (?)
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* [serial errors or special conditions seem to raise level 6
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* interrupts on some models (LC4xx?)]
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*
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* 6 - off switch (?)
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*
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* Machines with Quadra-like VIA hardware, except PSC and PMU machines, support
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* an alternate interrupt mapping, as used by A/UX. It spreads ethernet and
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* sound out to their own autovector IRQs and gives VIA1 a higher priority:
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*
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* 1 - unused (?)
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*
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* 3 - on-board SONIC
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*
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* 5 - Apple Sound Chip (ASC)
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*
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* 6 - VIA1
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*
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* For OSS Macintoshes (IIfx only), we apply an interrupt mapping similar to
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* the Quadra (A/UX) mapping:
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*
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* 1 - ISM IOP (ADB)
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*
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* 2 - SCSI
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*
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* 3 - NuBus
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*
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* 4 - SCC IOP
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*
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* 6 - VIA1
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*
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* For PSC Macintoshes (660AV, 840AV):
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*
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* 3 - PSC level 3
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* - slot 0: MACE
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*
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* 4 - PSC level 4
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* - slot 1: SCC channel A interrupt
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* - slot 2: SCC channel B interrupt
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* - slot 3: MACE DMA
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*
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* 5 - PSC level 5
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*
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* 6 - PSC level 6
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*
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* Finally we have good 'ole level 7, the non-maskable interrupt:
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*
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* 7 - NMI (programmer's switch on the back of some Macs)
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* Also RAM parity error on models which support it (IIc, IIfx?)
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*
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* The current interrupt logic looks something like this:
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*
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* - We install dispatchers for the autovector interrupts (1-7). These
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* dispatchers are responsible for querying the hardware (the
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* VIA/RBV/OSS/PSC chips) to determine the actual interrupt source. Using
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* this information a machspec interrupt number is generated by placing the
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* index of the interrupt hardware into the low three bits and the original
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* autovector interrupt number in the upper 5 bits. The handlers for the
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* resulting machspec interrupt are then called.
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*
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* - Nubus is a special case because its interrupts are hidden behind two
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* layers of hardware. Nubus interrupts come in as index 1 on VIA #2,
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* which translates to IRQ number 17. In this spot we install _another_
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* dispatcher. This dispatcher finds the interrupting slot number (9-F) and
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* then forms a new machspec interrupt number as above with the slot number
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* minus 9 in the low three bits and the pseudo-level 7 in the upper five
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* bits. The handlers for this new machspec interrupt number are then
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* called. This puts Nubus interrupts into the range 56-62.
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*
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* - The Baboon interrupts (used on some PowerBooks) are an even more special
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* case. They're hidden behind the Nubus slot $C interrupt thus adding a
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* third layer of indirection. Why oh why did the Apple engineers do that?
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*
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <asm/irq.h>
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#include <asm/macintosh.h>
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#include <asm/macints.h>
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#include <asm/mac_via.h>
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#include <asm/mac_psc.h>
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#include <asm/mac_oss.h>
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#include <asm/mac_iop.h>
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#include <asm/mac_baboon.h>
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#include <asm/hwtest.h>
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#include <asm/irq_regs.h>
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#define SHUTUP_SONIC
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/*
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* console_loglevel determines NMI handler function
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*/
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irqreturn_t mac_nmi_handler(int, void *);
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irqreturn_t mac_debug_handler(int, void *);
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/* #define DEBUG_MACINTS */
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static unsigned int mac_irq_startup(struct irq_data *);
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static void mac_irq_shutdown(struct irq_data *);
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static struct irq_chip mac_irq_chip = {
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.name = "mac",
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.irq_enable = mac_irq_enable,
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.irq_disable = mac_irq_disable,
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.irq_startup = mac_irq_startup,
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.irq_shutdown = mac_irq_shutdown,
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};
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void __init mac_init_IRQ(void)
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{
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#ifdef DEBUG_MACINTS
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printk("mac_init_IRQ(): Setting things up...\n");
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#endif
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m68k_setup_irq_controller(&mac_irq_chip, handle_simple_irq, IRQ_USER,
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NUM_MAC_SOURCES - IRQ_USER);
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/* Make sure the SONIC interrupt is cleared or things get ugly */
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#ifdef SHUTUP_SONIC
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printk("Killing onboard sonic... ");
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/* This address should hopefully be mapped already */
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if (hwreg_present((void*)(0x50f0a000))) {
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*(long *)(0x50f0a014) = 0x7fffL;
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*(long *)(0x50f0a010) = 0L;
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}
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printk("Done.\n");
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#endif /* SHUTUP_SONIC */
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/*
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* Now register the handlers for the master IRQ handlers
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* at levels 1-7. Most of the work is done elsewhere.
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*/
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if (oss_present)
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oss_register_interrupts();
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else
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via_register_interrupts();
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if (psc_present)
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psc_register_interrupts();
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if (baboon_present)
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baboon_register_interrupts();
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iop_register_interrupts();
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if (request_irq(IRQ_AUTO_7, mac_nmi_handler, 0, "NMI",
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mac_nmi_handler))
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pr_err("Couldn't register NMI\n");
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#ifdef DEBUG_MACINTS
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printk("mac_init_IRQ(): Done!\n");
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#endif
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}
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/*
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* mac_irq_enable - enable an interrupt source
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* mac_irq_disable - disable an interrupt source
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*
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* These routines are just dispatchers to the VIA/OSS/PSC routines.
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*/
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void mac_irq_enable(struct irq_data *data)
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{
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int irq = data->irq;
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int irq_src = IRQ_SRC(irq);
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switch(irq_src) {
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case 1:
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case 2:
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case 7:
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if (oss_present)
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oss_irq_enable(irq);
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else
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via_irq_enable(irq);
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break;
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case 3:
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case 4:
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case 5:
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case 6:
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if (psc_present)
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psc_irq_enable(irq);
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else if (oss_present)
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oss_irq_enable(irq);
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break;
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case 8:
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if (baboon_present)
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baboon_irq_enable(irq);
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break;
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}
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}
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void mac_irq_disable(struct irq_data *data)
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{
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int irq = data->irq;
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int irq_src = IRQ_SRC(irq);
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switch(irq_src) {
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case 1:
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case 2:
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case 7:
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if (oss_present)
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oss_irq_disable(irq);
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else
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via_irq_disable(irq);
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break;
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case 3:
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case 4:
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case 5:
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case 6:
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if (psc_present)
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psc_irq_disable(irq);
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else if (oss_present)
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oss_irq_disable(irq);
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break;
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case 8:
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if (baboon_present)
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baboon_irq_disable(irq);
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break;
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}
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}
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static unsigned int mac_irq_startup(struct irq_data *data)
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{
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int irq = data->irq;
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if (IRQ_SRC(irq) == 7 && !oss_present)
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via_nubus_irq_startup(irq);
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else
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mac_irq_enable(data);
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return 0;
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}
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static void mac_irq_shutdown(struct irq_data *data)
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{
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int irq = data->irq;
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if (IRQ_SRC(irq) == 7 && !oss_present)
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via_nubus_irq_shutdown(irq);
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else
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mac_irq_disable(data);
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}
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static int num_debug[8];
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irqreturn_t mac_debug_handler(int irq, void *dev_id)
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{
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if (num_debug[irq] < 10) {
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printk("DEBUG: Unexpected IRQ %d\n", irq);
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num_debug[irq]++;
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}
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return IRQ_HANDLED;
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}
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static int in_nmi;
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static volatile int nmi_hold;
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irqreturn_t mac_nmi_handler(int irq, void *dev_id)
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{
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int i;
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/*
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* generate debug output on NMI switch if 'debug' kernel option given
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* (only works with Penguin!)
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*/
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in_nmi++;
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for (i=0; i<100; i++)
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udelay(1000);
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if (in_nmi == 1) {
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nmi_hold = 1;
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printk("... pausing, press NMI to resume ...");
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} else {
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printk(" ok!\n");
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nmi_hold = 0;
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}
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barrier();
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while (nmi_hold == 1)
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udelay(1000);
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if (console_loglevel >= 8) {
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#if 0
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struct pt_regs *fp = get_irq_regs();
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show_state();
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printk("PC: %08lx\nSR: %04x SP: %p\n", fp->pc, fp->sr, fp);
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printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
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fp->d0, fp->d1, fp->d2, fp->d3);
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printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
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fp->d4, fp->d5, fp->a0, fp->a1);
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if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page)
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printk("Corrupted stack page\n");
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printk("Process %s (pid: %d, stackpage=%08lx)\n",
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current->comm, current->pid, current->kernel_stack_page);
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if (intr_count == 1)
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dump_stack((struct frame *)fp);
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#else
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/* printk("NMI "); */
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#endif
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}
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in_nmi--;
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return IRQ_HANDLED;
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}
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