patch-2.3.17 linux/arch/m68k/mac/macints.c
Next file: linux/arch/m68k/mac/oss.c
Previous file: linux/arch/m68k/mac/macboing.c
Back to the patch index
Back to the overall index
- Lines: 2029
- Date:
Sat Sep 4 13:06:41 1999
- Orig file:
v2.3.16/linux/arch/m68k/mac/macints.c
- Orig date:
Tue Jan 5 11:20:43 1999
diff -u --recursive --new-file v2.3.16/linux/arch/m68k/mac/macints.c linux/arch/m68k/mac/macints.c
@@ -7,8 +7,8 @@
* interrupts with exception vectors 0x19-0x1f). The following interrupt levels
* are used:
* 1 - VIA1
- * - slot 0: one second interrupt
- * - slot 1: VBlank
+ * - slot 0: one second interrupt (CA2)
+ * - slot 1: VBlank (CA1)
* - slot 2: ADB data ready (SR full)
* - slot 3: ADB data (CB2)
* - slot 4: ADB clock (CB1)
@@ -16,57 +16,103 @@
* - slot 6: timer 1
* - slot 7: status of IRQ; signals 'any enabled int.'
*
- * 2 - VIA2, RBV or OSS
- * - slot 0: SCSI DRQ
- * - slot 1: NUBUS IRQ
- * - slot 3: SCSI IRQ
- *
- * 4 - SCC
- * - subdivided into Channel B and Channel A interrupts
- *
- * 6 - Off switch (??)
- *
- * 7 - Debug output
- *
- * AV Macs only, handled by PSC:
- *
- * 3 - MACE ethernet IRQ (DMA complete on level 4)
- *
- * 5 - DSP ??
- *
- * Using the autovector irq numbers for Linux/m68k hardware interrupts without
- * the IRQ_MACHSPEC bit set would interfere with the general m68k interrupt
- * handling in kernel versions 2.0.x, so the following strategy is used:
- *
- * - mac_init_IRQ installs the low-level entry points for the via1 and via2
- * exception vectors and the corresponding handlers (C functions); these
- * entry points just add the machspec bit and call the handlers proper.
- * (in principle, the C functions can be installed as the exception vectors
- * directly, as they are hardcoded anyway; that's the current method).
- *
- * - via[12]_irq determine what interrupt sources have triggered the interrupt,
- * and call the corresponding device interrupt handlers.
- * (currently, via1_irq and via2_irq just call via_irq, passing the via base
- * address. RBV interrupts are handled by (you guessed it) rbv_irq).
- * Some interrupt functions want to have the interrupt number passed, so
- * via_irq and rbv_irq need to generate the 'fake' numbers from scratch.
- *
- * - for the request/free/enable/disable business, interrupt sources are
- * numbered internally (suggestion: keep irq 0-7 unused :-). One bit in the
- * irq number specifies the via# to use, i.e. via1 interrupts are 8-16,
- * via2 interrupts 17-32, rbv interrupts ...
- * The device interrupt table and the irq_enable bitmap is maintained by
- * the machspec interrupt code; all device drivers should only use these
- * functions !
- *
- * - For future porting to version 2.1 (and removing of the machspec bit) it
- * should be sufficient to use the same numbers (everything > 7 is assumed
- * to be machspec, according to Jes!).
+ * 2 - VIA2 or RBV
+ * - slot 0: SCSI DRQ (CA2)
+ * - slot 1: NUBUS IRQ (CA1) need to read port A to find which
+ * - slot 2: /EXP IRQ (only on IIci)
+ * - slot 3: SCSI IRQ (CB2)
+ * - slot 4: ASC IRQ (CB1)
+ * - slot 5: timer 2 (not on IIci)
+ * - slot 6: timer 1 (not on IIci)
+ * - slot 7: status of IRQ; signals 'any enabled int.'
+ *
+ * 2 - OSS (IIfx only?)
+ * - slot 0: SCSI interrupt
+ * - slot 1: Sound interrupt
+ *
+ * Levels 3-6 vary by machine type. For VIA or RBV Macintohes:
+ *
+ * 3 - unused (?)
+ *
+ * 4 - SCC (slot number determined by reading RR3 on the SSC itself)
+ * - slot 0: SCC channel A
+ * - slot 1: SCC channel B
+ *
+ * 5 - unused (?)
+ * [serial errors or special conditions seem to raise level 6
+ * interrupts on some models (LC4xx?)]
+ *
+ * 6 - off switch (?)
+ *
+ * For OSS Macintoshes (IIfx only at this point):
+ *
+ * 3 - Nubus interrupt
+ * - slot 0: Slot $9
+ * - slot 1: Slot $A
+ * - slot 2: Slot $B
+ * - slot 3: Slot $C
+ * - slot 4: Slot $D
+ * - slot 5: Slot $E
+ *
+ * 4 - SCC IOP
+ * - slot 0: SCC channel A
+ * - slot 1: SCC channel B
+ *
+ * 5 - ISM IOP (ADB?)
+ *
+ * 6 - unused
+ *
+ * For PSC Macintoshes (660AV, 840AV):
+ *
+ * 3 - PSC level 3
+ * - slot 0: MACE
+ *
+ * 4 - PSC level 4
+ * - slot 1: SCC channel A interrupt
+ * - slot 2: SCC channel B interrupt
+ * - slot 3: MACE DMA
+ *
+ * 5 - PSC level 5
+ *
+ * 6 - PSC level 6
+ *
+ * Finally we have good 'ole level 7, the non-maskable interrupt:
+ *
+ * 7 - NMI (programmer's switch on the back of some Macs)
+ * Also RAM parity error on models which support it (IIc, IIfx?)
+ *
+ * The current interrupt logic looks something like this:
+ *
+ * - We install dispatchers for the autovector interrupts (1-7). These
+ * dispatchers are responsible for querying the hardware (the
+ * VIA/RBV/OSS/PSC chips) to determine the actual interrupt source. Using
+ * this information a machspec interrupt number is generated by placing the
+ * index of the interrupt hardware into the low three bits and the original
+ * autovector interrupt number in the upper 5 bits. The handlers for the
+ * resulting machspec interrupt are then called.
+ *
+ * - Nubus is a special case because its interrupts are hidden behind two
+ * layers of hardware. Nubus interrupts come in as index 1 on VIA #2,
+ * which translates to IRQ number 17. In this spot we install _another_
+ * dispatcher. This dispatcher finds the interrupting slot number (9-F) and
+ * then forms a new machspec interrupt number as above with the slot number
+ * minus 9 in the low three bits and the pseudo-level 7 in the upper five
+ * bits. The handlers for this new machspec interrupt number are then
+ * called. This puts Nubus interrupts into the range 56-62.
+ *
+ * - We support "fast" and "slow" handlers, just like the Amiga port. The
+ * fast handlers are called first and with all interrupts disabled. They
+ * are expected to execute quickly (hence the name). The slow handlers are
+ * called last with interrupts enabled and the interrupt level restored.
+ * They must therefore be reentrant.
+ *
+ * - Drivers should never try to request autovector interrupt numbers. It
+ * won't work.
*
* TODO:
- * - integrate Nubus interrupts in request/free_irq
*
- * -
+ * o Perhaps build some intelligence into mac_SCC_handler(); we could check
+ * the SCC ourselves and only call the handler for the appopriate channel.
*/
#include <linux/config.h>
@@ -82,124 +128,53 @@
#include <asm/traps.h>
#include <asm/machw.h>
#include <asm/macintosh.h>
-#include "via6522.h"
+#include <asm/mac_via.h>
+#include <asm/mac_psc.h>
#include <asm/macints.h>
/*
- * Interrupt handler and parameter types
- */
-struct irqhandler {
- void (*handler)(int, void *, struct pt_regs *);
- void *dev_id;
-};
-
-struct irqparam {
- unsigned long flags;
- const char *devname;
-};
-
-struct irqflags {
- unsigned int disabled;
- unsigned int pending;
-};
-
-/*
- * Array with irq's and their parameter data.
- */
-static struct irqhandler via1_handler[8];
-static struct irqhandler via2_handler[8];
-static struct irqhandler rbv_handler[8];
-static struct irqhandler psc3_handler[8];
-static struct irqhandler scc_handler[8];
-static struct irqhandler psc5_handler[8];
-static struct irqhandler psc6_handler[8];
-static struct irqhandler nubus_handler[8];
-
-static struct irqhandler *handler_table[8];
-
-/*
- * This array hold the rest of parameters of int handlers: type
- * (slow,fast,prio) and the name of the handler. These values are only
- * accessed from C
- */
-static struct irqparam via1_param[8];
-static struct irqparam via2_param[8];
-static struct irqparam rbv_param[8];
-static struct irqparam psc3_param[8];
-static struct irqparam scc_param[8];
-static struct irqparam psc5_param[8];
-static struct irqparam psc6_param[8];
-static struct irqparam nubus_param[8];
-
-static struct irqparam *param_table[8];
-
-/*
- * This array holds the 'disabled' and 'pending' software flags maintained
- * by mac_{enable,disable}_irq and the generic via_irq function.
+ * VIA/RBV hooks
*/
-static struct irqflags irq_flags[8];
+extern void via_init(void);
+extern void via_register_interrupts(void);
+extern void via_irq_enable(int);
+extern void via_irq_disable(int);
+extern void via_irq_clear(int);
+extern int via_irq_pending(int);
/*
- * This array holds the pointers to the various VIA or other interrupt
- * controllers, indexed by interrupt level
+ * OSS hooks
*/
-static volatile unsigned char *via_table[8];
-
-/*
- * Arrays with irq statistics
- */
-static unsigned long via1_irqs[8];
-static unsigned long via2_irqs[8];
-static unsigned long rbv_irqs[8];
-static unsigned long psc3_irqs[8];
-static unsigned long scc_irqs[8];
-static unsigned long psc5_irqs[8];
-static unsigned long psc6_irqs[8];
-static unsigned long nubus_irqs[8];
-
-static unsigned long *mac_irqs[8];
-
-/*
- * Some special nutcases ...
- */
+extern int oss_present;
-static unsigned long mac_ide_irqs = 0;
-static unsigned long nubus_stuck_events = 0;
+extern void oss_init(void);
+extern void oss_register_interrupts(void);
+extern void oss_irq_enable(int);
+extern void oss_irq_disable(int);
+extern void oss_irq_clear(int);
+extern int oss_irq_pending(int);
/*
- * VIA/RBV/OSS/PSC register base pointers
+ * PSC hooks
*/
-volatile unsigned char *via2_regp=(volatile unsigned char *)VIA2_BAS;
-volatile unsigned char *rbv_regp=(volatile unsigned char *)VIA2_BAS_IIci;
-volatile unsigned char *oss_regp=(volatile unsigned char *)OSS_BAS;
-volatile unsigned char *psc_regp=(volatile unsigned char *)PSC_BAS;
-
-/*
- * Flags to control via2 / rbv behaviour
- */
-
-static int via2_is_rbv = 0;
-static int via2_is_oss = 0;
-static int rbv_clear = 0;
+extern int psc_present;
-/* fake VIA2 to OSS bit mapping */
-static int oss_map[8] = {2, 7, 0, 1, 3, 4, 5};
-
-void oss_irq(int irq, void *dev_id, struct pt_regs *regs);
-static void oss_do_nubus(int irq, void *dev_id, struct pt_regs *regs);
-
-/* PSC ints */
-void psc_irq(int irq, void *dev_id, struct pt_regs *regs);
+extern void psc_init(void);
+extern void psc_register_interrupts(void);
+extern void psc_irq_enable(int);
+extern void psc_irq_disable(int);
+extern void psc_irq_clear(int);
+extern int psc_irq_pending(int);
/*
- * PSC hooks
+ * IOP hooks
*/
-extern void psc_init(void);
+extern void iop_register_interrupts(void);
/*
* console_loglevel determines NMI handler function
@@ -207,656 +182,317 @@
extern int console_loglevel;
-/*
- * ADB test hooks
- */
-extern int in_keybinit;
-void adb_queue_poll(void);
-
-/* Defined in entry.S; only increments 'num_spurious' */
-asmlinkage void bad_interrupt(void);
-
-void nubus_wtf(int slot, void *via, struct pt_regs *regs);
-
-void mac_nmi_handler(int irq, void *dev_id, struct pt_regs *regs);
-void mac_debug_handler(int irq, void *dev_id, struct pt_regs *regs);
+extern void mac_bang(int, void *, struct pt_regs *);
-static void via_do_nubus(int slot, void *via, struct pt_regs *regs);
+void mac_nmi_handler(int, void *, struct pt_regs *);
+void mac_SCC_handler(int, void *, struct pt_regs *);
/* #define DEBUG_MACINTS */
-#define DEBUG_SPURIOUS
-#define DEBUG_NUBUS_SPURIOUS
-#define DEBUG_NUBUS_INT
-
-/* #define DEBUG_VIA */
-#define DEBUG_VIA_NUBUS
-
void mac_init_IRQ(void)
{
- int i;
-
#ifdef DEBUG_MACINTS
- printk("Mac interrupt stuff initializing ...\n");
+ printk("mac_init_IRQ(): Setting things up...\n");
#endif
-
- via2_regp = (unsigned char *)VIA2_BAS;
- rbv_regp = (unsigned char *)VIA2_BAS_IIci;
-
- /* initialize the hardwired (primary, autovector) IRQs */
-
- /* level 1 IRQ: VIA1, always present */
- sys_request_irq(1, via1_irq, IRQ_FLG_LOCK, "via1", via1_irq);
-
- /* via2 or rbv?? */
- if (macintosh_config->via_type == MAC_VIA_IIci) {
- /*
- * A word of caution: the definitions here only affect interrupt
- * handling, see via6522.c for yet another file to change
- * base addresses and RBV flags
- */
-
- /* yes, this is messy - the IIfx deserves a class of his own */
- if (macintosh_config->ident == MAC_MODEL_IIFX) {
- /* no real VIA2, the OSS seems _very_ different */
- via2_is_oss = 1;
- /* IIfx has OSS, at a different base address than RBV */
- rbv_regp = (unsigned char *) OSS_BAS;
- sys_request_irq(2, oss_irq, IRQ_FLG_LOCK, "oss", oss_irq);
- } else {
- /* VIA2 is part of the RBV: different base, other offsets */
- via2_is_rbv = 1;
-
- /* LC III weirdness: IFR seems to behave like VIA2 */
- /* FIXME: maybe also for LC II ?? */
- if (macintosh_config->ident == MAC_MODEL_LCIII) {
- rbv_clear = 0x0;
- } else {
- rbv_clear = 0x80;
- }
- /* level 2 IRQ: RBV/OSS; we only care about RBV for now */
- sys_request_irq(2, rbv_irq, IRQ_FLG_LOCK, "rbv", rbv_irq);
- }
- } else
- /* level 2 IRQ: VIA2 */
- sys_request_irq(2, via2_irq, IRQ_FLG_LOCK, "via2", via2_irq);
-
/*
- * level 4 IRQ: SCC - use 'master' interrupt routine that calls the
- * registered channel-specific interrupts in turn.
- * Currently, one interrupt per channel is used, solely
- * to pass the correct async_info as parameter!
+ * Register the handlers for the the master IRQ handlers
+ * at levels 1-7. Most of the work is done elsewhere.
*/
- sys_request_irq(4, mac_debug_handler, IRQ_FLG_STD, "INT4", mac_debug_handler);
-
- /* level 6 */
- sys_request_irq(6, mac_bang, IRQ_FLG_LOCK, "offswitch", mac_bang);
-
- /* level 7 (or NMI) : debug stuff */
- sys_request_irq(7, mac_nmi_handler, IRQ_FLG_STD, "NMI", mac_nmi_handler);
-
- /* initialize the handler tables for VIAs */
- for (i = 0; i < 8; i++) {
- via1_handler[i].handler = mac_default_handler;
- via1_handler[i].dev_id = NULL;
- via1_param[i].flags = IRQ_FLG_STD;
- via1_param[i].devname = NULL;
-
- via2_handler[i].handler = mac_default_handler;
- via2_handler[i].dev_id = NULL;
- via2_param[i].flags = IRQ_FLG_STD;
- via2_param[i].devname = NULL;
-
- rbv_handler[i].handler = mac_default_handler;
- rbv_handler[i].dev_id = NULL;
- rbv_param[i].flags = IRQ_FLG_STD;
- rbv_param[i].devname = NULL;
-
- scc_handler[i].handler = mac_default_handler;
- scc_handler[i].dev_id = NULL;
- scc_param[i].flags = IRQ_FLG_STD;
- scc_param[i].devname = NULL;
-
- /* NUBUS interrupts routed through VIA2 slot 2 - special */
- nubus_handler[i].handler = nubus_wtf;
- nubus_handler[i].dev_id = NULL;
- nubus_param[i].flags = IRQ_FLG_STD;
- nubus_param[i].devname = NULL;
-
- }
-
- /* initialize the handler tables (level 1 -> via_handler[0] !!!) */
- via_table[0] = via1_regp;
- handler_table[0] = &via1_handler[0];
- param_table[0] = &via1_param[0];
- mac_irqs[0] = &via1_irqs[0];
-
- if (via2_is_rbv || via2_is_oss) {
- via_table[1] = rbv_regp;
- handler_table[1] = &rbv_handler[0];
- param_table[1] = &rbv_param[0];
- mac_irqs[1] = &rbv_irqs[0];
+ if (oss_present) {
+ oss_register_interrupts();
} else {
- via_table[1] = via2_regp;
- handler_table[1] = &via2_handler[0];
- param_table[1] = &via2_param[0];
- mac_irqs[1] = &via2_irqs[0];
- }
- via_table[2] = NULL;
- via_table[3] = NULL;
-
- handler_table[2] = &rbv_handler[0];
- handler_table[3] = &scc_handler[0];
- handler_table[4] = NULL;
- handler_table[5] = NULL;
- handler_table[6] = NULL;
- handler_table[7] = &nubus_handler[0];
-
- param_table[2] = &rbv_param[0];
- param_table[3] = &scc_param[0];
- param_table[7] = &nubus_param[0];
-
- mac_irqs[2] = &rbv_irqs[0];
- mac_irqs[3] = &scc_irqs[0];
- mac_irqs[7] = &nubus_irqs[0];
-
- /*
- * Nubus Macs: turn off the Nubus dispatch interrupt for now
- */
-
- mac_turnoff_irq(IRQ_MAC_NUBUS);
-
- /*
- * AV Macs: shutup the PSC ints
- */
- if (macintosh_config->ident == MAC_MODEL_C660
- || macintosh_config->ident == MAC_MODEL_Q840)
- {
- psc_init();
-
- handler_table[2] = &psc3_handler[0];
- /* handler_table[3] = &psc4_handler[0]; */
- handler_table[4] = &psc5_handler[0];
- handler_table[5] = &psc6_handler[0];
-
- param_table[2] = &psc3_param[0];
- /* param_table[3] = &psc4_param[0]; */
- param_table[4] = &psc5_param[0];
- param_table[5] = &psc6_param[0];
-
- mac_irqs[2] = &psc3_irqs[0];
- /* mac_irqs[3] = &psc4_irqs[0]; */
- mac_irqs[4] = &psc5_irqs[0];
- mac_irqs[5] = &psc6_irqs[0];
-
- sys_request_irq(3, psc_irq, IRQ_FLG_STD, "PSC3", psc_irq);
- sys_request_irq(4, psc_irq, IRQ_FLG_STD, "PSC4", psc_irq);
- sys_request_irq(5, psc_irq, IRQ_FLG_STD, "PSC5", psc_irq);
- sys_request_irq(6, psc_irq, IRQ_FLG_STD, "PSC6", psc_irq);
+ via_register_interrupts();
}
-
+ if (psc_present) psc_register_interrupts();
+ iop_register_interrupts();
+ request_irq(7, mac_nmi_handler, IRQ_FLG_LOCK, "NMI", mac_nmi_handler);
#ifdef DEBUG_MACINTS
- printk("Mac interrupt init done!\n");
+ printk("mac_init_IRQ(): Done!\n");
#endif
}
/*
- * We have no machine specific interrupts on a macintoy
- * Yet, we need to register/unregister interrupts ... :-)
- * Currently unimplemented: Test for valid irq number, chained irqs,
- * Nubus interrupts (use nubus_request_irq!).
+ * Routines to work with irq_node_t's on linked lists lifted from
+ * the Amiga code written by Roman Zippel.
*/
-
-int mac_request_irq (unsigned int irq, void (*handler)(int, void *, struct pt_regs *),
- unsigned long flags, const char *devname, void *dev_id)
-{
- int srcidx = ((irq & IRQ_SRC_MASK)>>3) - 1;
- int irqidx = (irq & IRQ_IDX_MASK);
- struct irqhandler *via_handler;
- struct irqparam *via_param;
- volatile unsigned char *via;
-
-#ifdef DEBUG_MACINTS
- printk ("%s: IRQ %d on VIA%d[%d] requested from %s\n",
- __FUNCTION__, irq, srcidx+1, irqidx, devname);
-#endif
-
- if (flags < IRQ_TYPE_SLOW || flags > IRQ_TYPE_PRIO) {
- printk ("%s: Bad irq type %ld requested from %s\n",
- __FUNCTION__, flags, devname);
- return -EINVAL;
- }
-
- /* figure out what VIA is handling this irq */
- if (irq < IRQ_IDX(IRQ_VIA1_1) || irq >= IRQ_IDX(IRQ_NUBUS_1)) {
- /* non-via irqs unimplemented */
- printk ("%s: Bad irq source %d on VIA %d requested from %s\n",
- __FUNCTION__, irq, srcidx, devname);
- return -EINVAL;
- }
-
- /* figure out if SCC pseudo-irq (redundant ??) */
- if (irq >= IRQ_IDX(IRQ_SCC) && irq < IRQ_IDX(IRQ_PSC5_0)) {
- /* set specific SCC handler */
- scc_handler[irqidx].handler = handler;
- scc_handler[irqidx].dev_id = dev_id;
- scc_param[irqidx].flags = flags;
- scc_param[irqidx].devname = devname;
- /* and done! */
- return 0;
- }
-
- /*
- * code below: only for VIA irqs currently
- * add similar hack for Nubus pseudo-irq here - hide nubus_request_irq
- */
- via = (volatile unsigned char *) via_table[srcidx];
- if (!via)
- return -EINVAL;
-
- via_handler = handler_table[srcidx];
- via_param = param_table[srcidx];
-
- /* check for conflicts or possible replacement */
-
- /* set the handler - no chained irqs yet !! */
- via_handler[irqidx].handler = handler;
- via_handler[irqidx].dev_id = dev_id;
- via_param[irqidx].flags = flags;
- via_param[irqidx].devname = devname;
-
- /* and turn it on ... careful, that's VIA only ... */
- if (srcidx == SRC_VIA2 && via2_is_rbv)
- via_write(via, rIER, via_read(via, rIER)|0x80|(1<<(irqidx)));
- else if (srcidx == SRC_VIA2 && via2_is_oss)
- via_write(oss_regp, oss_map[irqidx]+8, 2);
- else
- via_write(via, vIER, via_read(via, vIER)|0x80|(1<<(irqidx)));
-
-
- if (irq == IRQ_IDX(IRQ_MAC_SCSI)) {
- /*
- * Set vPCR for SCSI interrupts. (what about RBV here?)
- * 980429 MS: RBV is ok, OSS seems to be different
- */
- if (!via2_is_oss)
- if (macintosh_config->scsi_type == MAC_SCSI_OLD) {
- /* CB2 (IRQ) indep. interrupt input, positive edge */
- /* CA2 (DRQ) indep. interrupt input, positive edge */
- via_write(via, vPCR, 0x66);
- } else {
- /* CB2 (IRQ) indep. interrupt input, negative edge */
- /* CA2 (DRQ) indep. interrupt input, negative edge */
- via_write(via, vPCR, 0x22);
- }
-#if 0
- else
- /* CB2 (IRQ) indep. interrupt input, negative edge */
- /* CA2 (DRQ) indep. interrupt input, negative edge */
- via_write(via, vPCR, 0x22);
-#endif
- }
- return 0;
-}
-
-void mac_free_irq (unsigned int irq, void *dev_id)
+static inline void mac_insert_irq(irq_node_t **list, irq_node_t *node)
{
- unsigned long flags;
- int srcidx = ((irq & IRQ_SRC_MASK)>>3) - 1;
- int irqidx = (irq & IRQ_IDX_MASK);
- struct irqhandler *via_handler;
- struct irqparam *via_param;
- volatile unsigned char *via;
+ unsigned long cpu_flags;
+ irq_node_t *cur;
-#ifdef DEBUG_MACINTS
- printk ("%s: IRQ %d on VIA%d[%d] freed\n",
- __FUNCTION__, irq, srcidx+1, irqidx);
-#endif
+ if (!node->dev_id)
+ printk("%s: Warning: dev_id of %s is zero\n",
+ __FUNCTION__, node->devname);
- /* figure out what VIA is handling this irq */
- if (irq < IRQ_IDX(IRQ_VIA1_1) || irq >= IRQ_IDX(IRQ_NUBUS_1)) {
- /* non-via irqs unimplemented */
- return;
- }
-
- save_flags(flags);
+ save_flags(cpu_flags);
cli();
- /* figure out if SCC pseudo-irq */
- if (irq >= IRQ_IDX(IRQ_SCC) && irq < IRQ_IDX(IRQ_PSC5_0)) {
- /* clear specific SCC handler */
- scc_handler[irqidx].handler = mac_default_handler;
- scc_handler[irqidx].dev_id = NULL;
- scc_param[irqidx].flags = IRQ_FLG_STD;
- scc_param[irqidx].devname = NULL;
- /* and done! */
- restore_flags(flags);
- return;
- }
+ cur = *list;
- via = (volatile unsigned char *) via_table[srcidx];
- via_handler = handler_table[srcidx];
- via_param = param_table[srcidx];
-
- if ( !via || (via_handler[irqidx].dev_id != dev_id) ) {
- restore_flags(flags);
- goto not_found;
+ if (node->flags & IRQ_FLG_FAST) {
+ node->flags &= ~IRQ_FLG_SLOW;
+ while (cur && cur->flags & IRQ_FLG_FAST) {
+ list = &cur->next;
+ cur = cur->next;
+ }
+ } else if (node->flags & IRQ_FLG_SLOW) {
+ while (cur) {
+ list = &cur->next;
+ cur = cur->next;
+ }
+ } else {
+ while (cur && !(cur->flags & IRQ_FLG_SLOW)) {
+ list = &cur->next;
+ cur = cur->next;
+ }
}
- /* clear the handler - no chained irqs yet !! */
- via_handler[irqidx].handler = mac_default_handler;
- via_handler[irqidx].dev_id = NULL;
- via_param[irqidx].flags = IRQ_FLG_STD;
- via_param[irqidx].devname = NULL;
-
- /* and turn it off */
- if (srcidx == SRC_VIA2 && via2_is_rbv)
- via_write(via, rIER, (via_read(via, rIER)&(1<<irqidx)));
- else if (srcidx == SRC_VIA2 && via2_is_oss)
- via_write(oss_regp, oss_map[irqidx]+8, 0);
- else
- via_write(via, vIER, (via_read(via, vIER)&(1<<irqidx)));
-
- restore_flags(flags);
- return;
-
-not_found:
- printk("%s: tried to remove invalid irq\n", __FUNCTION__);
- return;
+ node->next = cur;
+ *list = node;
+ restore_flags(cpu_flags);
}
-/*
- * {en,dis}able_irq have the usual semantics of temporary blocking the
- * interrupt, but not loosing requests that happen between disabling and
- * enabling. On Atari, this is done with the MFP mask registers.
- *
- * On the Mac, this isn't possible: there is no VIA mask register.
- * Needs to be implemented in software, setting 'mask' bits in a separate
- * struct for each interrupt controller. These mask bits need to be checked
- * by the VIA interrupt routine which should ignore requests for masked IRQs
- * (after possibly ack'ing them).
- *
- * On second thought: some of the IRQ sources _can_ be turned off via bits
- * in the VIA output registers. Need to check this ...
- *
- * TBI: According to the VIA docs, clearing a bit in the IER has the effect of
- * blocking generation of the interrupt, but the internal interrupt condition
- * is preserved. So the IER might be used as mask register here, and turnon_irq
- * would need to clear the interrupt bit in the IFR to prevent getting an
- * interrupt at all.
- *
- * Implementation note: the irq no's here are the _machspec_ irqs, hence the
- * hack with srcidx to figure out which VIA/RBV handles the interrupt.
- * That's fundamentally different when it comes to the interrupt handlers
- * proper: these get the interrupt level no. as argument, all information about
- * which source triggered the int. is buried in the VIA IFR ... The int. level
- * points us to the proper handler, so we could do a sanity check there ...
- */
-
-void mac_enable_irq (unsigned int irq)
+static inline void mac_delete_irq(irq_node_t **list, void *dev_id)
{
- int srcidx = ((irq & IRQ_SRC_MASK)>>3) - 1;
- int irqidx = (irq & IRQ_IDX_MASK);
+ unsigned long cpu_flags;
+ irq_node_t *node;
- irq_flags[srcidx].disabled &= ~(1<<irqidx);
- /*
- * Call handler here if irq_flags[srcidx].pending & 1<<irqidx ??
- * The structure of via_irq prevents this, sort of: it warns if
- * no true events are pending. Maybe that's being changed ...
- * Other problem: is it always possible to call an interrupt handler,
- * or should that depend on the current interrupt level?
- */
-}
-
-void mac_disable_irq (unsigned int irq)
-{
- int srcidx = ((irq & IRQ_SRC_MASK)>>3) - 1;
- int irqidx = (irq & IRQ_IDX_MASK);
+ save_flags(cpu_flags);
+ cli();
- irq_flags[srcidx].disabled |= (1<<irqidx);
+ for (node = *list; node; list = &node->next, node = *list) {
+ if (node->dev_id == dev_id) {
+ *list = node->next;
+ /* Mark it as free. */
+ node->handler = NULL;
+ restore_flags(cpu_flags);
+ return;
+ }
+ }
+ restore_flags(cpu_flags);
+ printk ("%s: tried to remove invalid irq\n", __FUNCTION__);
}
/*
- * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not
- * "stored". This is done with the VIA interrupt enable register on VIAs.
+ * Call all the handlers for a given interrupt. Fast handlers are called
+ * first followed by slow handlers.
*
- * Note: Using these functions on non-VIA/OSS/PSC ints will panic, or at least
- * have undesired side effects.
+ * This code taken from the original Amiga code written by Roman Zippel.
*/
-void mac_turnon_irq( unsigned int irq )
+void mac_do_irq_list(int irq, struct pt_regs *fp)
{
- int srcidx = ((irq & IRQ_SRC_MASK)>>3) - 1;
- int irqidx = (irq & IRQ_IDX_MASK);
- volatile unsigned char *via;
-
- via = (volatile unsigned char *) via_table[srcidx];
- if (!via)
- return;
+ irq_node_t *node, *slow_nodes, **list = NULL;
+ unsigned long cpu_flags;
- if (srcidx == SRC_VIA2 && via2_is_rbv) /* RBV as VIA2 */
- via_write(via, rIER, via_read(via, rIER)|0x80|(1<<(irqidx)));
- else if (srcidx == SRC_VIA2 && via2_is_oss) /* OSS */
- via_write(oss_regp, oss_map[irqidx]+8, 2);
- else if (srcidx > SRC_VIA2) /* hope AVs have VIA2 */
- via_write(via, (0x104 + 0x10*srcidx),
- via_read(via, (0x104 + 0x10*srcidx))|0x80|(1<<(irqidx)));
- else /* VIA1+2 */
- via_write(via, vIER, via_read(via, vIER)|0x80|(1<<(irqidx)));
+ kstat.irqs[0][irq]++;
-}
-
-void mac_turnoff_irq( unsigned int irq )
-{
- int srcidx = ((irq & IRQ_SRC_MASK)>>3) - 1;
- int irqidx = (irq & IRQ_IDX_MASK);
- volatile unsigned char *via;
+ if (irq < VIA1_SOURCE_BASE) {
+ list = &autoirq_list[irq];
+ } else if (irq < NUM_MAC_SOURCES) {
+ list = &userirq_list[irq - VIA1_SOURCE_BASE];
+ }
+ if (!list) return;
- via = (volatile unsigned char *) via_table[srcidx];
- if (!via)
+#ifdef DEBUG_SPURIOUS
+ if (!*list && (console_loglevel > 7)) {
+ printk("mac_do_irq_list: spurious interrupt %d!\n", irq);
return;
+ }
+#endif
- if (srcidx == SRC_VIA2 && via2_is_rbv) /* RBV as VIA2 */
- via_write(via, rIER, (via_read(via, rIER)&(1<<irqidx)));
- else if (srcidx == SRC_VIA2 && via2_is_oss) /* OSS */
- via_write(oss_regp, oss_map[irqidx]+8, 0);
- /*
- * VIA2 is fixed. The stuff above VIA2 is for later
- * macintoshes only.
- */
- else if (srcidx > SRC_VIA2)
- via_write(via, (0x104 + 0x10*srcidx),
- via_read(via, (0x104 + 0x10*srcidx))|(1<<(irqidx)));
- else /* VIA1+2 */
- via_write(via, vIER, (via_read(via, vIER)&(1<<irqidx)));
+ /* serve first fast and normal handlers */
+ for (node = *list;
+ node && (!(node->flags & IRQ_FLG_SLOW));
+ node = node->next)
+ node->handler(irq, node->dev_id, fp);
+ if (!node) return;
+ save_flags(cpu_flags);
+ restore_flags((cpu_flags & ~0x0700) | (fp->sr & 0x0700));
+ /* if slow handlers exists, serve them now */
+ slow_nodes = node;
+ for (; node; node = node->next) {
+ node->handler(irq, node->dev_id, fp);
+ }
}
/*
- * These functions currently only handle the software-maintained irq pending
- * list for disabled irqs - manipulating the actual irq flags in the via would
- * require clearing single bits in the via, such as (probably)
- * via_write(via, vIFR, (via_read(via, vIFR)&(1<<irqidx))); - don't know if
- * this has side-effects ...
+ * mac_enable_irq - enable an interrupt source
+ * mac_disable_irq - disable an interrupt source
+ * mac_clear_irq - clears a pending interrupt
+ * mac_pending_irq - Returns the pending status of an IRQ (nonzero = pending)
+ *
+ * These routines are just dispatchers to the VIA/OSS/PSC routines.
*/
-void mac_clear_pending_irq( unsigned int irq )
+void mac_enable_irq (unsigned int irq)
{
- int srcidx = ((irq & IRQ_SRC_MASK)>>3) - 1;
- int irqidx = (irq & IRQ_IDX_MASK);
-
- irq_flags[srcidx].pending &= ~(1<<irqidx);
+ switch(IRQ_SRC(irq)) {
+ case 1: via_irq_enable(irq);
+ break;
+ case 2:
+ case 7: if (oss_present) {
+ oss_irq_enable(irq);
+ } else {
+ via_irq_enable(irq);
+ }
+ break;
+ case 3:
+ case 4:
+ case 5:
+ case 6: if (psc_present) {
+ psc_irq_enable(irq);
+ } else if (oss_present) {
+ oss_irq_enable(irq);
+ }
+ break;
+ }
}
-int mac_irq_pending( unsigned int irq )
+void mac_disable_irq (unsigned int irq)
{
- int pending = 0;
- volatile unsigned char *via;
-
- int srcidx = ((irq & IRQ_SRC_MASK)>>3) - 1;
- int irqidx = (irq & IRQ_IDX_MASK);
-
- pending = irq_flags[srcidx].pending & (1<<irqidx);
+ switch(IRQ_SRC(irq)) {
+ case 1: via_irq_disable(irq);
+ break;
+ case 2:
+ case 7:
+ if (oss_present) {
+ oss_irq_disable(irq);
+ } else {
+ via_irq_disable(irq);
+ }
+ break;
+ case 3:
+ case 4:
+ case 5:
+ case 6: if (psc_present) {
+ psc_irq_disable(irq);
+ } else if (oss_present) {
+ oss_irq_disable(irq);
+ }
+ break;
+ }
+}
- via = (volatile unsigned char *) via_table[srcidx];
- if (!via)
- return (pending);
-
- if (srcidx == SRC_VIA2 && via2_is_rbv)
- pending |= via_read(via, rIFR)&(1<<irqidx);
- else if (srcidx == SRC_VIA2 && via2_is_oss)
- pending |= via_read(via, oIFR)&0x03&(1<<oss_map[irqidx]);
- else if (srcidx > SRC_VIA2)
- pending |= via_read(via, (0x100 + 0x10*srcidx))&(1<<irqidx);
- else
- pending |= via_read(via, vIFR)&(1<<irqidx);
+void mac_clear_irq( unsigned int irq )
+{
+ switch(IRQ_SRC(irq)) {
+ case 1: via_irq_clear(irq);
+ break;
+ case 2:
+ case 7: if (oss_present) {
+ oss_irq_clear(irq);
+ } else {
+ via_irq_clear(irq);
+ }
+ break;
+ case 3:
+ case 4:
+ case 5:
+ case 6: if (psc_present) {
+ psc_irq_clear(irq);
+ } else if (oss_present) {
+ oss_irq_clear(irq);
+ }
+ break;
+ }
+}
- return (pending);
+int mac_irq_pending( unsigned int irq )
+{
+ switch(IRQ_SRC(irq)) {
+ case 1: return via_irq_pending(irq);
+ case 2:
+ case 7: if (oss_present) {
+ return oss_irq_pending(irq);
+ } else {
+ return via_irq_pending(irq);
+ }
+ case 3:
+ case 4:
+ case 5:
+ case 6: if (psc_present) {
+ return psc_irq_pending(irq);
+ } else if (oss_present) {
+ return oss_irq_pending(irq);
+ }
+ }
+ return 0;
}
/*
- * for /proc/interrupts: log interrupt stats broken down by
- * autovector int first, then by actual interrupt source.
+ * Add an interrupt service routine to an interrupt source.
+ * Returns 0 on success.
+ *
+ * FIXME: You can register interrupts on nonexistant source (ie PSC4 on a
+ * non-PSC machine). We should return -EINVAL in those cases.
*/
-
-int mac_get_irq_list (char *buf)
+
+int mac_request_irq(unsigned int irq,
+ void (*handler)(int, void *, struct pt_regs *),
+ unsigned long flags, const char *devname, void *dev_id)
{
- int i, len = 0;
- int srcidx, irqidx;
+ int vec, ret;
- for (i = VIA1_SOURCE_BASE; i < NUM_MAC_SOURCES+8; ++i) {
- /* XXX fixme: IRQ_SRC_MASK should cover VIA1 - Nubus */
- srcidx = ((i & IRQ_SRC_MASK)>>3) - 1;
- irqidx = (i & IRQ_IDX_MASK);
-
- /*
- * Not present: skip
- */
-
- if (mac_irqs[srcidx] == NULL)
- continue;
-
- /*
- * never used by VIAs, unused by others so far, counts
- * the magic 'nothing pending' cases ...
- */
- if (irqidx == 7 && mac_irqs[srcidx][irqidx]) {
- len += sprintf(buf+len, "Level %01d: %10lu (spurious) \n",
- srcidx,
- mac_irqs[srcidx][irqidx]);
- continue;
- }
-
- /*
- * Nothing registered for this IPL: skip
- */
-
- if (handler_table[srcidx] == NULL)
- continue;
-
- /*
- * No handler installed: skip
- */
-
- if (handler_table[srcidx][irqidx].handler == mac_default_handler ||
- handler_table[srcidx][irqidx].handler == nubus_wtf)
- continue;
-
-
- if (i < VIA2_SOURCE_BASE)
- len += sprintf(buf+len, "via1 %01d: %10lu ",
- irqidx,
- mac_irqs[srcidx][irqidx]);
- else if (i < RBV_SOURCE_BASE)
- len += sprintf(buf+len, "via2 %01d: %10lu ",
- irqidx,
- mac_irqs[srcidx][irqidx]);
- else if (i < MAC_SCC_SOURCE_BASE)
- len += sprintf(buf+len, "rbv %01d: %10lu ",
- irqidx,
- mac_irqs[srcidx][irqidx]);
- else if (i < NUBUS_SOURCE_BASE)
- len += sprintf(buf+len, "scc %01d: %10lu ",
- irqidx,
- mac_irqs[srcidx][irqidx]);
- else /* Nubus */
- len += sprintf(buf+len, "nubus %01d: %10lu ",
- irqidx,
- mac_irqs[srcidx][irqidx]);
-
- len += sprintf(buf+len, "%s\n",
- param_table[srcidx][irqidx].devname);
+#ifdef DEBUG_MACINTS
+ printk ("%s: irq %d requested for %s\n", __FUNCTION__, irq, devname);
+#endif
+ if (irq < VIA1_SOURCE_BASE) {
+ vec = VEC_SPUR + irq;
+ } else if (irq < NUM_MAC_SOURCES) {
+ vec = VEC_USER + irq - VIA1_SOURCE_BASE;
+ } else {
+ printk ("%s: unknown irq %d requested by %s\n",
+ __FUNCTION__, irq, devname);
+ return -EAGAIN;
}
- if (num_spurious)
- len += sprintf(buf+len, "spurio.: %10u\n", num_spurious);
-
- /*
- * XXX Fixme: Nubus sources are never logged above ...
- */
-
- len += sprintf(buf+len, "Nubus interrupts:\n");
-
- for (i = 0; i < 7; i++) {
- if (nubus_handler[i].handler == nubus_wtf)
- continue;
- len += sprintf(buf+len, "nubus %01X: %10lu ",
- i+9,
- nubus_irqs[i]);
- len += sprintf(buf+len, "%s\n",
- nubus_param[i].devname);
+ ret = sys_request_listirq(vec, handler, flags, devname, dev_id);
+ if (!ret) {
+ vectors[vec] = autoirq_listhandler;
+ mac_enable_irq(irq);
}
- len += sprintf(buf+len, "nubus spurious ints: %10lu\n",
- nubus_irqs[7]);
- len += sprintf(buf+len, "nubus stuck events : %10lu\n",
- nubus_stuck_events);
-#ifdef CONFIG_BLK_DEV_IDE
- len += sprintf(buf+len, "nubus/IDE interrupt: %10lu\n",
- mac_ide_irqs);
-#endif
- return len;
+ return ret;
}
+
+/*
+ * Removes an interrupt service routine from an interrupt source.
+ */
-void via_scsi_clear(void)
+void mac_free_irq(unsigned int irq, void *dev_id)
{
- volatile unsigned char deep_magic;
- if (via2_is_rbv) {
- via_write(rbv_regp, rIFR, (1<<3)|(1<<0)|0x80);
- deep_magic = via_read(rbv_regp, rBufB);
- } else if (via2_is_oss) {
- /* nothing */
- /* via_write(oss_regp, 9, 0) */;
- } else
- deep_magic = via_read(via2_regp, vBufB);
- mac_enable_irq( IRQ_IDX(IRQ_MAC_SCSI) );
-}
+ irq_node_t **list = NULL;
+ int vec = 0;
-
-void mac_default_handler(int irq, void *dev_id, struct pt_regs *regs)
-{
-#ifdef DEBUG_SPURIOUS
- if (console_loglevel > 6)
- printk("Unexpected IRQ %d on device %p\n", irq, dev_id);
+#ifdef DEBUG_MACINTS
+ printk ("%s: irq %d freed by %p\n", __FUNCTION__, irq, dev_id);
#endif
-}
-static int num_debug[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
+ if (irq < VIA1_SOURCE_BASE) {
+ vec = VEC_SPUR + irq;
+ list = &autoirq_list[irq];
+ } else if (irq < NUM_MAC_SOURCES) {
+ vec = VEC_USER + irq - VIA1_SOURCE_BASE;
+ list = &userirq_list[irq - VIA1_SOURCE_BASE];
+ }
+ if (!list) return;
-void mac_debug_handler(int irq, void *dev_id, struct pt_regs *regs)
-{
- if (num_debug[irq] < 10) {
- printk("DEBUG: Unexpected IRQ %d\n", irq);
- num_debug[irq]++;
+ sys_free_irq(vec, dev_id);
+
+ /* If the list for this interrupt is */
+ /* empty then disable the source. */
+
+ if (!*list) {
+ mac_disable_irq(irq);
+ vectors[vec] = bad_interrupt;
}
}
-void scsi_mac_debug(void);
-void scsi_mac_polled(void);
-
static int in_nmi = 0;
static volatile int nmi_hold = 0;
@@ -869,10 +505,6 @@
*/
in_nmi++;
-#if 0
- scsi_mac_debug();
- printk("PC: %08lx\nSR: %04x SP: %p\n", fp->pc, fp->sr, fp);
-#endif
for (i=0; i<100; i++)
udelay(1000);
@@ -889,10 +521,6 @@
while (nmi_hold == 1)
udelay(1000);
-#if 0
- scsi_mac_polled();
-#endif
-
if ( console_loglevel >= 8 ) {
#if 0
show_state();
@@ -916,799 +544,12 @@
}
/*
- * Unexpected via interrupt
- */
-
-void via_wtf(int slot, void *via, struct pt_regs *regs)
-{
-#ifdef DEBUG_SPURIOUS
- if (console_loglevel > 6)
- printk("Unexpected nubus event %d on via %p\n",slot,via);
-#endif
-}
-
-/*
- * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's
- * via6522.c :-), disable/pending masks added.
- * The int *viaidx etc. is just to keep the prototype happy ...
- */
-
-static void via_irq(unsigned char *via, int *viaidx, struct pt_regs *regs)
-{
- unsigned char events=(via_read(via, vIFR)&via_read(via,vIER))&0x7F;
- int i;
- int ct = 0;
- struct irqhandler *via_handler = handler_table[*viaidx];
- struct irqparam *via_param = param_table[*viaidx];
- unsigned long *via_irqs = mac_irqs[*viaidx];
-
- /* to be changed, possibly: for each non'masked', enabled IRQ, read
- * flag bit, ack and call handler ...
- * Currently: all pending irqs ack'ed en bloc.
- * If ack for masked IRQ required: keep 'pending' info separate.
- */
-
- /* shouldn't we disable interrupts here ?? */
-
-
- /*
- * Shouldnt happen
- */
-
- if(events==0)
- {
-#ifdef DEBUG_VIA
- /* should go away; mostly missing timer ticks and ADB events */
- printk("via%d_irq: nothing pending, flags %x mask %x!\n",
- *viaidx + 1, via_read(via, vIFR), via_read(via,vIER));
-#endif
- via_irqs[7]++;
- return;
- }
-
-#ifdef DEBUG_VIA
- /*
- * limited verbosity for VIA interrupts
- */
-#if 0
- if ( (*viaidx == 0 && events != 1<<6) /* timer int */
- || (*viaidx == 1 && events != 1<<3) ) /* SCSI IRQ */
-#else
- if ( *viaidx == 0 && (events & 1<<2) )
-#endif
- printk("via_irq: irq %d events %x !\n", (*viaidx)+1, events);
-#endif
-
- do {
- /*
- * Clear the pending flag
- */
-
- via_write(via, vIFR, events);
-
- /*
- * Now see what bits are raised
- */
-
- for(i=0;i<7;i++)
- {
- /* determine machspec. irq no. */
- int irq = ((*viaidx)+1)* 8 + i;
- /* call corresponding handlers */
- if (events&(1<<i)) {
- if (irq_flags[*viaidx].disabled & (1<<i)) {
- if (!irq_flags[*viaidx].pending&(1<<i))
- via_irqs[i]++;
- /* irq disabled -> mark pending */
- irq_flags[*viaidx].pending |= (1<<i);
- } else {
- via_irqs[i]++;
- /* irq enabled -> call handler */
- (via_handler[i].handler)(irq, via, regs);
- }
- }
- /* and call handlers for pending irqs - first ?? */
- if ( (irq_flags[*viaidx].pending & (1<<i))
- && !(irq_flags[*viaidx].disabled & (1<<i)) ) {
- /* call handler for re-enabled irq */
- (via_handler[i].handler)(irq, via, regs);
- /* and clear pending flag :-) */
- irq_flags[*viaidx].pending &= ~(1<<i);
- }
- }
-
- /*
- * And done ... check for more punishment!
- */
-
- events=(via_read(via, vIFR)&via_read(via,vIER))&0x7F;
- ct++;
- if(events && ct>8)
- {
-#ifdef DEBUG_VIA
- printk("via%d: stuck events %x\n", (*viaidx)+1, events);
-#endif
- break;
- }
- }
- while(events);
-#if 0
- scsi_mac_polled();
-#endif
-}
-
-/*
- * Caution: the following stuff is called from process_int as _autovector_
- * system interrupts. So irq is always in the range 0-7 :-( and the selection
- * of the appropriate VIA is up to the irq handler here based on the autovec
- * irq number. There's no information whatsoever about which source on the VIA
- * triggered the int - and that's what the machspec irq no's are about.
- * Broken design :-((((
- */
-
-/*
- * System interrupts
- */
-
-void via1_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
- int srcidx = IRQ_IDX(irq) - 1;
- via_irq((unsigned char *)via1_regp, &srcidx, regs);
-}
-
-
-/*
- * Nubus / SCSI interrupts, VIA style (could be wrapped into via1_irq or
- * via_irq directly by selecting the regp based on the irq!)
- */
-
-void via2_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
- int srcidx = IRQ_IDX(irq) - 1;
- via_irq((unsigned char *)via2_regp, &srcidx, regs);
-}
-
-/*
- * Nubus / SCSI interrupts; RBV style
- * The RBV is different. RBV appears to stand for randomly broken
- * VIA (or even real broken VIA).
- */
-
-void rbv_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
- int srcidx = IRQ_IDX(irq) - 1; /* MUST be 1 !! */
- volatile unsigned char *via = rbv_regp;
- unsigned char events=(via_read(via, rIFR)&via_read(via,rIER))&0x7F;
- int i;
- int ct = 0;
- struct irqhandler *via_handler = handler_table[srcidx];
- struct irqparam *via_param = param_table[srcidx];
-
- /* shouldn't we disable interrupts here ?? */
-
-
- /*
- * Shouldnt happen
- */
-
- if(events==0)
- {
-#ifdef DEBUG_VIA
- printk("rbv_irq: nothing pending, flags %x mask %x!\n",
- via_read(via, rIFR), via_read(via,rIER));
-#endif
- rbv_irqs[7]++;
- return;
- }
-
-#ifdef DEBUG_VIA
- /*
- * limited verbosity for RBV interrupts (add more if needed)
- */
- if ( srcidx == 1 && events != 1<<3 ) /* SCSI IRQ */
- printk("rbv_irq: irq %d (%d) events %x !\n", irq, srcidx+1, events);
-#endif
-
- /* to be changed, possibly: for each non'masked', enabled IRQ, read
- * flag bit, ack and call handler ...
- * Currently: all pending irqs ack'ed en bloc.
- * If ack for masked IRQ required: keep 'pending' info separate.
- */
-
- do {
- /*
- * Clear the pending flag
- */
-
- via_write(via, rIFR, events | rbv_clear);
-
- /*
- * Now see what bits are raised
- */
-
- for(i=0;i<7;i++)
- {
- /* determine machspec. irq no. */
- int irq = (srcidx+1)* 8 + i;
- /* call corresponding handlers */
- if (events&(1<<i)) {
- if (irq_flags[srcidx].disabled & (1<<i)) {
- if (!irq_flags[srcidx].pending&(1<<i))
- rbv_irqs[i]++;
- /* irq disabled -> mark pending */
- irq_flags[srcidx].pending |= (1<<i);
- } else {
- rbv_irqs[i]++;
- /* irq enabled -> call handler */
- (via_handler[i].handler)(irq, via, regs);
- }
- }
- /* and call handlers for pending irqs - first ?? */
- if ( (irq_flags[srcidx].pending & (1<<i))
- && !(irq_flags[srcidx].disabled & (1<<i)) ) {
- /* call handler for re-enabled irq */
- (via_handler[i].handler)(irq, via, regs);
- /* and clear pending flag :-) */
- irq_flags[srcidx].pending &= ~(1<<i);
- }
- }
-
- /*
- * And done ... check for more punishment!
- */
-
- events=(via_read(via, rIFR)&via_read(via,rIER))&0x7F;
- ct++;
- if(events && ct>8)
- {
- printk("rbv: stuck events %x\n",events);
- for(i=0;i<7;i++)
- {
- if(events&(1<<i))
- {
- printk("rbv - bashing source %d\n",
- i);
- via_write(via, rIER, 1<<i);
- via_write(via, rIFR, (1<<i) | rbv_clear);
- }
- }
- break;
- }
- }
- while(events);
-#if 0
- scsi_mac_polled();
-#endif
-}
-
-/*
- * Nubus / SCSI interrupts; OSS style
- * The OSS is even more different than the RBV. OSS appears to stand for
- * Obscenely Screwed Silicon ...
- *
- * Latest NetBSD sources suggest the OSS should behave like a RBV, but
- * that's probably true for the 0x203 offset (Nubus/ADB-SWIM IOP) at best
- */
-
-void oss_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
- int srcidx = IRQ_IDX(irq) - 1; /* MUST be 1 !! */
- volatile unsigned char *via = oss_regp;
- unsigned char events=(via_read(via, oIFR))&0x03;
- unsigned char nub_ev=(via_read(via, nIFR))&0x4F;
- unsigned char adb_ev;
- int i;
- int ct = 0;
- struct irqhandler *via_handler = handler_table[srcidx];
- struct irqparam *via_param = param_table[srcidx];
-
- /* shouldn't we disable interrupts here ?? */
-
- adb_ev = nub_ev & 0x40;
- nub_ev &= 0x3F;
-
- /*
- * Shouldnt happen
- */
-
- if (events==0 && adb_ev==0 && nub_ev==0)
- {
- printk("oss_irq: nothing pending, flags %x %x!\n",
- via_read(via, oIFR), via_read(via, nIFR));
- rbv_irqs[7]++;
- return;
- }
-
-#ifdef DEBUG_VIA
- /*
- * limited verbosity for RBV interrupts (add more if needed)
- */
- if ( events != 1<<3 ) /* SCSI IRQ */
- printk("oss_irq: irq %d srcidx+1 %d events %x %x %x !\n", irq, srcidx+1,
- events, adb_ev, nub_ev);
-#endif
-
- /*
- * OSS priorities: call ADB handler first if registered, other events,
- * then Nubus
- * ADB: yet to be implemented!
- */
-
- /*
- * ADB: try to shutup the IOP
- */
- if (adb_ev) {
- printk("Hands off ! Don't press this button ever again !!!\n");
- via_write(via, 6, 0);
- }
-
- do {
- /*
- * Clear the pending flags
- * How exactly is that supposed to work ??
- */
-
- /*
- * Now see what bits are raised
- */
-
- for(i=0;i<7;i++)
- {
- /* HACK HACK: map to bit number in OSS register */
- int irqidx = oss_map[i];
- /* determine machspec. irq no. */
- int irq = (srcidx+1)* 8 + i;
- /* call corresponding handlers */
- if ( (events&(1<<irqidx)) && /* bit set*/
- (via_read(via, irqidx+8)&0x7) ) { /* irq enabled */
- if (irq_flags[srcidx].disabled & (1<<i)) {
- if (!irq_flags[srcidx].pending&(1<<i))
- rbv_irqs[i]++;
- /* irq disabled -> mark pending */
- irq_flags[srcidx].pending |= (1<<i);
- } else {
- rbv_irqs[i]++;
- /* irq enabled -> call handler */
- (via_handler[i].handler)(irq, via, regs);
- }
- }
- /* and call handlers for pending irqs - first ?? */
- if ( (irq_flags[srcidx].pending & (1<<i))
- && !(irq_flags[srcidx].disabled & (1<<i)) ) {
- /* call handler for re-enabled irq */
- (via_handler[i].handler)(irq, via, regs);
- /* and clear pending flag :-) */
- irq_flags[srcidx].pending &= ~(1<<i);
- }
- }
-
- /*
- * And done ... check for more punishment!
- */
-
- events=(via_read(via, oIFR)/*&via_read(via,rIER)*/)&0x03;
- ct++;
- if(events && ct>8)
- {
- printk("oss: stuck events %x\n",events);
- for(i=0;i<7;i++)
- {
- if(events&(1<<i))
- {
- printk("oss - bashing source %d\n",
- i);
- /* that should disable it */
- via_write(via, 8+i, 0);
- }
- }
- break;
- }
- }
- while(events);
-#if 0
- scsi_mac_polled();
-#endif
-
- if (nub_ev)
- oss_do_nubus(irq, via, regs);
-
-}
-
-/*
- * Unexpected slot interrupt
- */
-
-void nubus_wtf(int slot, void *via, struct pt_regs *regs)
-{
-#ifdef DEBUG_NUBUS_SPURIOUS
- if (console_loglevel > 6)
- printk("Unexpected interrupt on nubus slot %d\n",slot);
-#endif
-}
-
-/*
* SCC master interrupt handler; sole purpose: pass the registered
* async struct to the SCC handler proper.
*/
void mac_SCC_handler(int irq, void *dev_id, struct pt_regs *regs)
{
- int i;
- /* 1+2: compatibility with PSC ! */
- for (i = 1; i < 3; i++) /* currently only these two used */
- if (scc_handler[i].handler != mac_default_handler) {
- (scc_handler[i].handler)(i, scc_handler[i].dev_id, regs);
- scc_irqs[i]++;
- }
-}
-
-/*
- * PSC interrupt handler
- */
-
-void psc_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
- int srcidx = IRQ_IDX(irq) - 1;
- volatile unsigned char *via = psc_regp;
- unsigned int pIFR = 0x100 + 0x10*srcidx;
- unsigned int pIER = 0x104 + 0x10*srcidx;
- unsigned char events=(via_read(via, pIFR)&via_read(via,pIER))&0xF;
- int i;
- int ct = 0;
- struct irqhandler *via_handler = handler_table[srcidx];
- struct irqparam *via_param = param_table[srcidx];
-
- /* shouldn't we disable interrupts here ?? */
-
-
- /*
- * Shouldnt happen
- */
-
- if(events==0)
- {
-#ifdef DEBUG_VIA
- printk("psc_irq: nothing pending, flags %x mask %x!\n",
- via_read(via, pIFR), via_read(via,pIER));
-#endif
- mac_irqs[srcidx][7]++;
- return;
- }
-
-#ifdef DEBUG_VIA
- /*
- * limited verbosity for PSC interrupts (add more if needed)
- */
- if ( srcidx == 1 && events != 1<<3 && events != 1<<1 ) /* SCSI IRQ */
- printk("psc_irq: irq %d srcidx+1 %d events %x !\n", irq, srcidx+1, events);
-#endif
-
- /* to be changed, possibly: for each non'masked', enabled IRQ, read
- * flag bit, ack and call handler ...
- * Currently: all pending irqs ack'ed en bloc.
- * If ack for masked IRQ required: keep 'pending' info separate.
- */
-
- do {
- /*
- * Clear the pending flag
- */
-
- /* via_write(via, pIFR, events); */
-
- /*
- * Now see what bits are raised
- */
-
- for(i=0;i<7;i++)
- {
- /* determine machspec. irq no. */
- int irq = (srcidx+1)* 8 + i;
- /* call corresponding handlers */
- if (events&(1<<i)) {
- if (irq_flags[srcidx].disabled & (1<<i)) {
- if (!irq_flags[srcidx].pending&(1<<i))
- mac_irqs[srcidx][i]++;
- /* irq disabled -> mark pending */
- irq_flags[srcidx].pending |= (1<<i);
- } else {
- mac_irqs[srcidx][i]++;
- /* irq enabled -> call handler */
- (via_handler[i].handler)(irq, via, regs);
- }
- }
- /* and call handlers for pending irqs - first ?? */
- if ( (irq_flags[srcidx].pending & (1<<i))
- && !(irq_flags[srcidx].disabled & (1<<i)) ) {
- /* call handler for re-enabled irq */
- (via_handler[i].handler)(irq, via, regs);
- /* and clear pending flag :-) */
- irq_flags[srcidx].pending &= ~(1<<i);
- }
- }
-
- /*
- * And done ... check for more punishment!
- */
-
- events=(via_read(via,pIFR)&via_read(via,pIER))&0x7F;
- ct++;
- if(events && ct>8)
- {
- printk("psc: stuck events %x\n",events);
- for(i=0;i<7;i++)
- {
- if(events&(1<<i))
- {
- printk("psc - bashing source %d\n",
- i);
- via_write(via, pIER, 1<<i);
- /* via_write(via, pIFR, (1<<i)); */
- }
- }
- break;
- }
- }
- while(events);
-}
-
-
-/*
- * Nubus handling
- * Caution: slot numbers are currently 'hardcoded' to the range 9-15!
- * In general, the same request_irq() functions as above can be used if
- * the interrupt numbers specifed in macints.h are used.
- */
-
-static int nubus_active=0;
-
-int nubus_request_irq(int slot, void *dev_id, void (*handler)(int,void *,struct pt_regs *))
-{
- slot-=9;
-/* printk("Nubus request irq for slot %d\n",slot);*/
- if(nubus_handler[slot].handler!=nubus_wtf)
- return -EBUSY;
- nubus_handler[slot].handler=handler;
- nubus_handler[slot].dev_id =dev_id;
- nubus_param[slot].flags = IRQ_FLG_LOCK;
- nubus_param[slot].devname = "nubus slot";
-
- /*
- * if no nubus int. was active previously: register the main nubus irq
- * handler now!
- */
-
- if (!nubus_active && !via2_is_oss) {
- request_irq(IRQ_MAC_NUBUS, via_do_nubus, IRQ_FLG_LOCK,
- "nubus dispatch", via_do_nubus);
- mac_turnon_irq(IRQ_MAC_NUBUS);
- }
-
- nubus_active|=1<<slot;
-/* printk("program slot %d\n",slot);*/
-/* printk("via2=%p\n",via2);*/
-#if 0
- via_write(via2, vDirA,
- via_read(via2, vDirA)|(1<<slot));
- via_write(via2, vBufA, 0);
-#endif
- if (via2_is_oss)
- via_write(oss_regp, slot, 2);
- else if (!via2_is_rbv) {
- /* Make sure the bit is an input */
- via_write(via2_regp, vDirA,
- via_read(via2_regp, vDirA)&~(1<<slot));
- }
-/* printk("nubus irq on\n");*/
- return 0;
-}
-
-int nubus_free_irq(int slot)
-{
- slot-=9;
- nubus_active&=~(1<<slot);
- nubus_handler[slot].handler=nubus_wtf;
- nubus_handler[slot].dev_id = NULL;
- nubus_param[slot].flags = IRQ_FLG_STD;
- nubus_param[slot].devname = NULL;
-
- if (via2_is_rbv)
- via_write(rbv_regp, rBufA, 1<<slot);
- else if (via2_is_oss)
- via_write(oss_regp, slot, 0);
- else {
- via_write(via2_regp, vDirA,
- via_read(via2_regp, vDirA)|(1<<slot));
- via_write(via2_regp, vBufA, 1<<slot);
- via_write(via2_regp, vDirA,
- via_read(via2_regp, vDirA)&~(1<<slot));
- }
- return 0;
-}
-
-#ifdef CONFIG_BLK_DEV_MAC_IDE
-/*
- * IDE interrupt hook
- */
-extern void (*mac_ide_intr_hook)(int, void *, struct pt_regs *);
-extern int (*mac_ide_irq_p_hook)(void);
-#endif
-
-/*
- * Nubus dispatch handler - VIA/RBV style
- */
-static void via_do_nubus(int slot, void *via, struct pt_regs *regs)
-{
- unsigned char map, allints;
- int i;
- int ct=0;
- int ide_pending = 0;
-
- /* lock the nubus interrupt */
- /* That's just 'clear Nubus IRQ bit in VIA2' BTW. Pretty obsolete ? */
- if (via2_is_rbv)
- via_write(rbv_regp, rIFR, 0x82);
- else
- via_write(via2_regp, vIFR, 0x82);
-
-#ifdef CONFIG_BLK_DEV_MAC_IDE
- /* IDE hack */
- if (mac_ide_intr_hook) {
- /* 'slot' is lacking the machspec bit in 2.0 */
- /* need to pass proper dev_id = hwgroup here */
- mac_ide_intr_hook(IRQ_MAC_NUBUS, via, regs);
- mac_ide_irqs++;
- }
-#endif
-
- while(1)
- {
- if (via2_is_rbv)
- allints = ~via_read(rbv_regp, rBufA);
- else
- allints = ~via_read(via2_regp, vBufA);
-
-#ifdef CONFIG_BLK_DEV_MAC_IDE
- if (mac_ide_irq_p_hook)
- ide_pending = mac_ide_irq_p_hook();
-#endif
-
- if ( (map = (allints&nubus_active)) == 0
-#ifdef CONFIG_BLK_DEV_MAC_IDE
- && !ide_pending
-#endif
- )
- {
- if (ct == 0) {
-#ifdef DEBUG_VIA_NUBUS
- if (console_loglevel > 5)
- printk("nubus_irq: nothing pending, map %x mask %x active %x\n",
- allints, nubus_active, map);
-#endif
- nubus_irqs[7]++;
- }
- /* clear it */
- if (allints)
- if (via2_is_rbv)
- via_write(rbv_regp, rIFR, 0x02);
- else
- via_write(via2_regp, vIFR, 0x02);
- break;
- }
-
-#ifdef DEBUG_VIA_NUBUS
- if (console_loglevel > 6)
- printk("nubus_irq: map %x mask %x active %x\n",
- allints, nubus_active, map);
-#endif
-
-#ifdef CONFIG_BLK_DEV_MAC_IDE
- if (mac_ide_intr_hook && ide_pending) {
- mac_ide_intr_hook(IRQ_MAC_NUBUS, via, regs);
- mac_ide_irqs++;
- }
-#endif
-
- if(ct++>2)
- {
- if (console_loglevel > 5)
- printk("nubus stuck events - %x/%x/%x ide %x\n",
- allints, nubus_active, map, ide_pending);
- nubus_stuck_events++;
-
- return;
- }
-
- for(i=0;i<7;i++)
- {
- if(map&(1<<i))
- {
- nubus_irqs[i]++;
- (nubus_handler[i].handler)(i+9, nubus_handler[i].dev_id, regs);
- }
- }
- /* clear it */
- if (via2_is_rbv)
- via_write(rbv_regp, rIFR, 0x02);
- else
- via_write(via2_regp, vIFR, 0x02);
-
- }
-
- /* And done */
-}
-
-/*
- * Nubus dispatch handler - OSS style
- */
-static void oss_do_nubus(int slot, void *via, struct pt_regs *regs)
-{
- unsigned char map;
- int i;
- int ct=0;
-
-/* printk("nubus interrupt\n");*/
-
-#if 0
- /* lock the nubus interrupt */
- if (via2_is_rbv)
- via_write(rbv_regp, rIFR, 0x82);
- else
- via_write(via2_regp, vIFR, 0x82);
-#endif
-
- /* IDE hack for Quadra: uses Nubus interrupt without any slot bit set */
-#ifdef CONFIG_BLK_DEV_MAC_IDE
- if (mac_ide_intr_hook)
- mac_ide_intr_hook(IRQ_MAC_NUBUS, via, regs);
-#endif
-
- while(1)
- {
- /* pending events */
- map=(via_read(via, nIFR))&0x3F;
-
-#ifdef DEBUG_VIA_NUBUS
- printk("nubus_irq: map %x mask %x\n", map, nubus_active);
-#endif
- if( (map = (map&nubus_active)) ==0 ) {
- if (ct == 0) {
-#ifdef CONFIG_BLK_DEV_MAC_IDE
- if (!mac_ide_intr_hook)
- printk("nubus_irq: nothing pending, map %x mask %x\n",
- map, nubus_active);
-#endif
- nubus_irqs[7]++;
- }
- break;
- }
-
- if(ct++>2)
- {
-#if 0
- printk("nubus stuck events - %d/%d\n", map, nubus_active);
-#endif
- return;
- }
-
- for(i=0;i<7;i++)
- {
- if(map&(1<<i))
- {
- nubus_irqs[i]++;
- /* call handler */
- (nubus_handler[i].handler)((i+9), nubus_handler[i].dev_id, regs);
- /* clear interrupt ?? */
-#if 0
- via_write(oss_regp, i, 0);
-#endif
- }
- }
- /* clear it */
-#if 0
- via_write(oss_regp, nIFR, map);
-#endif
- }
-
- /* And done */
+ mac_do_irq_list(IRQ_SCCA, regs);
+ mac_do_irq_list(IRQ_SCCB, regs);
}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)