patch-2.1.116 linux/arch/alpha/kernel/sys_dp264.c

• Lines: 232
• Date: Sun Aug 9 12:09:05 1998
• Orig file: v2.1.115/linux/arch/alpha/kernel/sys_dp264.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.115/linux/arch/alpha/kernel/sys_dp264.c linux/arch/alpha/kernel/sys_dp264.c
@@ -0,0 +1,231 @@
+/*
+ *	linux/arch/alpha/kernel/sys_dp264.c
+ *
+ *	Copyright (C) 1995 David A Rusling
+ *	Copyright (C) 1996 Jay A Estabrook
+ *	Copyright (C) 1998 Richard Henderson
+ *
+ * Code supporting the DP264 (EV6+TSUNAMI).
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/bitops.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/core_tsunami.h>
+
+#include "proto.h"
+#include "irq.h"
+#include "bios32.h"
+#include "machvec.h"
+
+
+/*
+ * HACK ALERT! only CPU#0 is used currently
+ */
+
+static void
+dp264_update_irq_hw(unsigned long irq, unsigned long mask, int unmask_p)
+{
+	if (irq >= 16) {
+		/* Make CERTAIN none of the bogus ints get enabled */
+		*(vulp)TSUNAMI_CSR_DIM0 =
+			~(mask) & ~0x0000000000000000UL;
+		mb();
+		/* ... and read it back to make sure it got written.  */
+		*(vulp)TSUNAMI_CSR_DIM0;
+	}
+	else if (irq >= 8)
+		outb(mask >> 8, 0xA1);	/* ISA PIC2 */
+	else
+		outb(mask, 0x21);	/* ISA PIC1 */
+}
+
+static void
+dp264_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+        unsigned long pld;
+        unsigned int i;
+        unsigned long flags;
+
+	__save_and_cli(flags);
+
+        /* Read the interrupt summary register of TSUNAMI */
+        pld = (*(vulp)TSUNAMI_CSR_DIR0);
+
+        /*
+         * Now for every possible bit set, work through them and call
+         * the appropriate interrupt handler.
+         */
+        while (pld) {
+                i = ffz(~pld);
+                pld &= pld - 1; /* clear least bit set */
+                if (i == 55) {
+                        isa_device_interrupt(vector, regs);
+		} else { /* if not timer int */
+                        handle_irq(16 + i, 16 + i, regs);
+                }
+#if 0
+		*(vulp)TSUNAMI_CSR_DIR0 = 1UL << i; mb();
+		tmp = *(vulp)TSUNAMI_CSR_DIR0;
+#endif
+        }
+	__restore_flags(flags);
+}
+
+static void 
+dp264_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+	int irq, ack;
+	unsigned long flags;
+
+	__save_and_cli(flags);
+	ack = irq = (vector - 0x800) >> 4;
+
+        /*
+         * The DP264 SRM console reports PCI interrupts with a vector
+	 * 0x100 *higher* than one might expect, as PCI IRQ 0 (ie bit 0)
+	 * shows up as IRQ 16, etc, etc. We adjust it down by 16 to have
+	 * it line up with the actual bit numbers from the DIM registers,
+	 * which is how we manage the interrupts/mask. Sigh...
+         */
+        if (irq >= 32)
+                ack = irq = irq - 16;
+
+	handle_irq(irq, ack, regs);
+	__restore_flags(flags);
+}
+
+static void __init
+dp264_init_irq(void)
+{
+	STANDARD_INIT_IRQ_PROLOG;
+
+	if (alpha_using_srm)
+		alpha_mv.device_interrupt = dp264_srm_device_interrupt;
+
+	/* Note invert on MASK bits.  */
+        *(vulp)TSUNAMI_CSR_DIM0 = ~(alpha_irq_mask) & ~0UL; mb();
+        *(vulp)TSUNAMI_CSR_DIM0;
+
+        enable_irq(55);     /* Enable CYPRESS interrupt controller (ISA).  */
+	enable_irq(2);
+}
+
+
+/*
+ * PCI Fixup configuration.
+ *
+ * Summary @ TSUNAMI_CSR_DIM0:
+ * Bit      Meaning
+ * 0-17     Unused
+ *18        Interrupt SCSI B (Adaptec 7895 builtin)
+ *19        Interrupt SCSI A (Adaptec 7895 builtin)
+ *20        Interrupt Line D from slot 2 PCI0
+ *21        Interrupt Line C from slot 2 PCI0
+ *22        Interrupt Line B from slot 2 PCI0
+ *23        Interrupt Line A from slot 2 PCI0
+ *24        Interrupt Line D from slot 1 PCI0
+ *25        Interrupt Line C from slot 1 PCI0
+ *26        Interrupt Line B from slot 1 PCI0
+ *27        Interrupt Line A from slot 1 PCI0
+ *28        Interrupt Line D from slot 0 PCI0
+ *29        Interrupt Line C from slot 0 PCI0
+ *30        Interrupt Line B from slot 0 PCI0
+ *31        Interrupt Line A from slot 0 PCI0
+ *
+ *32        Interrupt Line D from slot 3 PCI1
+ *33        Interrupt Line C from slot 3 PCI1
+ *34        Interrupt Line B from slot 3 PCI1
+ *35        Interrupt Line A from slot 3 PCI1
+ *36        Interrupt Line D from slot 2 PCI1
+ *37        Interrupt Line C from slot 2 PCI1
+ *38        Interrupt Line B from slot 2 PCI1
+ *39        Interrupt Line A from slot 2 PCI1
+ *40        Interrupt Line D from slot 1 PCI1
+ *41        Interrupt Line C from slot 1 PCI1
+ *42        Interrupt Line B from slot 1 PCI1
+ *43        Interrupt Line A from slot 1 PCI1
+ *44        Interrupt Line D from slot 0 PCI1
+ *45        Interrupt Line C from slot 0 PCI1
+ *46        Interrupt Line B from slot 0 PCI1
+ *47        Interrupt Line A from slot 0 PCI1
+ *48-52     Unused
+ *53        PCI0 NMI (from Cypress)
+ *54        PCI0 SMI INT (from Cypress)
+ *55        PCI0 ISA Interrupt (from Cypress)
+ *56-60     Unused
+ *61        PCI1 Bus Error
+ *62        PCI0 Bus Error
+ *63        Reserved
+ *
+ * IdSel	
+ *   5	 Cypress Bridge I/O
+ *   6	 SCSI Adaptec builtin
+ *   7	 64 bit PCI option slot 0
+ *   8	 64 bit PCI option slot 1
+ *   9	 64 bit PCI option slot 2
+ * 
+ */
+
+static int __init
+dp264_map_irq(struct pci_dev *dev, int slot, int pin)
+{
+	static char irq_tab[5][5] __initlocaldata = {
+		/*INT    INTA   INTB   INTC   INTD */
+		{    -1,    -1,    -1,    -1,    -1}, /* IdSel 5 ISA Bridge */
+		{ 16+ 2, 16+ 2, 16+ 2, 16+ 2, 16+ 2}, /* IdSel 6 SCSI builtin*/
+		{ 16+15, 16+15, 16+14, 16+13, 16+12}, /* IdSel 7 slot 0 */
+		{ 16+11, 16+11, 16+10, 16+ 9, 16+ 8}, /* IdSel 8 slot 1 */
+		{ 16+ 7, 16+ 7, 16+ 6, 16+ 5, 16+ 4}  /* IdSel 9 slot 2 */
+	};
+	const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
+	return COMMON_TABLE_LOOKUP;
+}
+
+static void __init
+dp264_pci_fixup(void)
+{
+	layout_all_busses(DEFAULT_IO_BASE, DEFAULT_MEM_BASE);
+	common_pci_fixup(dp264_map_irq, common_swizzle);
+	SMC669_Init();
+}
+
+
+/*
+ * The System Vector
+ */
+
+struct alpha_machine_vector dp264_mv __initmv = {
+	vector_name:		"DP264",
+	DO_EV6_MMU,
+	DO_DEFAULT_RTC,
+	DO_TSUNAMI_IO,
+	DO_TSUNAMI_BUS,
+	machine_check:		tsunami_machine_check,
+	max_dma_address:	ALPHA_MAX_DMA_ADDRESS,
+
+	nr_irqs:		64,
+	irq_probe_mask:		_PROBE_MASK(64),
+	update_irq_hw:		dp264_update_irq_hw,
+	ack_irq:		generic_ack_irq,
+	device_interrupt:	dp264_device_interrupt,
+
+	init_arch:		tsunami_init_arch,
+	init_irq:		dp264_init_irq,
+	init_pit:		generic_init_pit,
+	pci_fixup:		dp264_pci_fixup,
+	kill_arch:		generic_kill_arch,
+};
+ALIAS_MV(dp264)