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

• Lines: 268
• Date: Sun Aug 9 12:09:05 1998
• Orig file: v2.1.115/linux/arch/alpha/kernel/sys_ruffian.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.115/linux/arch/alpha/kernel/sys_ruffian.c linux/arch/alpha/kernel/sys_ruffian.c
@@ -0,0 +1,267 @@
+/*
+ *	linux/arch/alpha/kernel/sys_ruffian.c
+ *
+ *	Copyright (C) 1995 David A Rusling
+ *	Copyright (C) 1996 Jay A Estabrook
+ *	Copyright (C) 1998 Richard Henderson
+ *
+ * Code supporting the RUFFIAN.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/core_pyxis.h>
+
+#include "proto.h"
+#include "irq.h"
+#include "bios32.h"
+#include "machvec.h"
+
+
+static void
+ruffian_update_irq_hw(unsigned long irq, unsigned long mask, int unmask_p)
+{
+	if (irq >= 16) {
+		/* Note inverted sense of mask bits: */
+		/* Make CERTAIN none of the bogus ints get enabled... */
+		*(vulp)PYXIS_INT_MASK =
+			~((long)mask >> 16) & 0x00000000ffffffbfUL;
+		mb();
+		/* ... and read it back to make sure it got written.  */
+		*(vulp)PYXIS_INT_MASK;
+	}
+	else if (irq >= 8)
+		outb(mask >> 8, 0xA1);	/* ISA PIC2 */
+	else
+		outb(mask, 0x21);	/* ISA PIC1 */
+}
+
+static void
+ruffian_ack_irq(unsigned long irq)
+{
+	if (irq < 16) {
+		/* Ack PYXIS ISA interrupt.  */
+		*(vulp)PYXIS_INT_REQ = 1L << 7; mb();
+		/* ... and read it back to make sure it got written.  */
+		*(vulp)PYXIS_INT_REQ;
+		if (irq > 7) {
+			outb(0x20, 0xa0);
+		}
+		outb(0x20, 0x20);
+	} else {
+		/* Ack PYXIS PCI interrupt.  */
+		*(vulp)PYXIS_INT_REQ = (1UL << (irq - 16));
+		/* ... and read it back to make sure it got written.  */
+		*(vulp)PYXIS_INT_REQ;
+	}
+}
+
+static void
+ruffian_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 PYXIS */
+	pld = *(vulp)PYXIS_INT_REQ;
+
+	/* For now, AND off any bits we are not interested in:
+	 * HALT (2), timer (6), ISA Bridge (7), 21142 (8)
+	 * then all the PCI slots/INTXs (12-31) 
+	 * flash(5) :DWH:
+	 */
+        pld &= 0x00000000ffffff9fUL; /* was ffff7f */
+
+	/*
+	 * 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 == 7) {
+			/* Copy this bit from isa_device_interrupt cause
+			   we need to hook into int 0 for the timer.  I
+			   refuse to soil device_interrupt with ifdefs.  */
+
+			/* Generate a PCI interrupt acknowledge cycle.
+			   The PIC will respond with the interrupt
+			   vector of the highest priority interrupt
+			   that is pending.  The PALcode sets up the
+			   interrupts vectors such that irq level L
+			   generates vector L.  */
+
+			unsigned int j = *(vuip)PYXIS_IACK_SC & 0xff;
+			if (j == 7 && !(inb(0x20) & 0x80)) {
+				/* It's only a passive release... */
+			} else if (j == 0) {
+				timer_interrupt(regs);
+				ruffian_ack_irq(0);
+			} else {
+				handle_irq(j, j, regs);
+			}
+                } else {
+			/* if not timer int */
+			handle_irq(16 + i, 16 + i, regs);
+		}
+
+                *(vulp)PYXIS_INT_REQ = 1UL << i; mb();
+                *(vulp)PYXIS_INT_REQ; /* read to force the write */
+	}
+	restore_flags(flags);
+}
+
+static void __init
+ruffian_init_irq(void)
+{
+	STANDARD_INIT_IRQ_PROLOG;
+
+	/* Invert 6&7 for i82371 */
+	*(vulp)PYXIS_INT_HILO  = 0x000000c0UL; mb();
+	*(vulp)PYXIS_INT_CNFG  = 0x00002064UL; mb();	 /* all clear */
+	*(vulp)PYXIS_INT_MASK  = 0x00000000UL; mb();
+	*(vulp)PYXIS_INT_REQ   = 0xffffffffUL; mb();
+
+	outb(0x11,0xA0);
+	outb(0x08,0xA1);
+	outb(0x02,0xA1);
+	outb(0x01,0xA1);
+	outb(0xFF,0xA1);
+	
+	outb(0x11,0x20);
+	outb(0x00,0x21);
+	outb(0x04,0x21);
+	outb(0x01,0x21);
+	outb(0xFF,0x21);
+	
+	/* Send -INTA pulses to clear any pending interrupts ...*/
+	*(vuip) PYXIS_IACK_SC;
+
+	/* Finish writing the 82C59A PIC Operation Control Words */
+	outb(0x20,0xA0);
+	outb(0x20,0x20);
+	
+	/* Turn on the interrupt controller, the timer interrupt  */
+	enable_irq(16 + 7);	/* enable ISA PIC cascade */
+	enable_irq(0);		/* enable timer */
+	enable_irq(2);		/* enable 2nd PIC cascade */
+}
+
+
+/*
+ * For RUFFIAN, we do not want to make any modifications to the PCI
+ * setup.  So just scan the busses.
+ */
+
+static void __init
+ruffian_pci_fixup(void)
+{
+	layout_all_busses(DEFAULT_IO_BASE, DEFAULT_MEM_BASE);
+}
+
+
+/*
+ * The DeskStation Ruffian motherboard firmware does not place
+ * the memory size in the PALimpure area.  Therefore, we use
+ * the Bank Configuration Registers in PYXIS to obtain the size.
+ */
+static unsigned long __init
+ruffian_get_bank_size(unsigned long offset)
+{
+	unsigned long bank_addr, bank, ret = 0;
+  
+	/* Valid offsets are: 0x800, 0x840 and 0x880
+	   since Ruffian only uses three banks.  */
+	bank_addr = (unsigned long)PYXIS_MCR + offset;
+	bank = *(vulp)bank_addr;
+    
+	/* Check BANK_ENABLE */
+	if (bank & 0x01) {
+		static unsigned long size[] __initdata = {
+			0x40000000UL, /* 0x00,   1G */ 
+			0x20000000UL, /* 0x02, 512M */
+			0x10000000UL, /* 0x04, 256M */
+			0x08000000UL, /* 0x06, 128M */
+			0x04000000UL, /* 0x08,  64M */
+			0x02000000UL, /* 0x0a,  32M */
+			0x01000000UL, /* 0x0c,  16M */
+			0x00800000UL, /* 0x0e,   8M */
+			0x80000000UL, /* 0x10,   2G */
+		};
+
+		bank = (bank & 0x1e) >> 1;
+		if (bank < sizeof(size)/sizeof(*size))
+			ret = size[bank];
+	}
+
+	return ret;
+}
+
+static void __init
+ruffian_init_arch(unsigned long *mem_start, unsigned long *mem_end)
+{
+	/* FIXME: What do we do with ruffian_get_bank_size above?  */
+
+	pyxis_enable_errors();
+	if (!pyxis_srm_window_setup()) {
+	        printk("ruffian_init_arch: Skipping window register rewrites."
+		       "\n... Trust DeskStation firmware!\n");
+	}
+	pyxis_finish_init_arch();
+}
+
+
+static void
+ruffian_init_pit (void)
+{
+	/* Ruffian depends on the system timer established in MILO! */
+	request_region(0x70, 0x10, "timer");
+	init_pit_rest();
+}
+
+
+/*
+ * The System Vector
+ */
+
+#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_RUFFIAN)
+struct alpha_machine_vector ruffian_mv __initmv = {
+	vector_name:		"Ruffian",
+	DO_EV5_MMU,
+	DO_DEFAULT_RTC,
+	DO_PYXIS_IO,
+	DO_PYXIS_BUS,
+	machine_check:		pyxis_machine_check,
+	max_dma_address:	ALPHA_MAX_DMA_ADDRESS,
+
+	nr_irqs:		48,
+	irq_probe_mask:		RUFFIAN_PROBE_MASK,
+	update_irq_hw:		ruffian_update_irq_hw,
+	ack_irq:		ruffian_ack_irq,
+	device_interrupt:	ruffian_device_interrupt,
+
+	init_arch:		ruffian_init_arch,
+	init_irq:		ruffian_init_irq,
+	init_pit:		ruffian_init_pit,
+	pci_fixup:		ruffian_pci_fixup,
+	kill_arch:		generic_kill_arch,
+};
+ALIAS_MV(ruffian)
+#endif