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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/alpha/kernel/sys_eiger.c
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/alpha/kernel/sys_eiger.c')
-rw-r--r--arch/alpha/kernel/sys_eiger.c242
1 files changed, 242 insertions, 0 deletions
diff --git a/arch/alpha/kernel/sys_eiger.c b/arch/alpha/kernel/sys_eiger.c
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+++ b/arch/alpha/kernel/sys_eiger.c
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+/*
+ * linux/arch/alpha/kernel/sys_eiger.c
+ *
+ * Copyright (C) 1995 David A Rusling
+ * Copyright (C) 1996, 1999 Jay A Estabrook
+ * Copyright (C) 1998, 1999 Richard Henderson
+ * Copyright (C) 1999 Iain Grant
+ *
+ * Code supporting the EIGER (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 <linux/bitops.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/pci.h>
+#include <asm/pgtable.h>
+#include <asm/core_tsunami.h>
+#include <asm/hwrpb.h>
+#include <asm/tlbflush.h>
+
+#include "proto.h"
+#include "irq_impl.h"
+#include "pci_impl.h"
+#include "machvec_impl.h"
+
+
+/* Note that this interrupt code is identical to TAKARA. */
+
+/* Note mask bit is true for DISABLED irqs. */
+static unsigned long cached_irq_mask[2] = { -1, -1 };
+
+static inline void
+eiger_update_irq_hw(unsigned long irq, unsigned long mask)
+{
+ int regaddr;
+
+ mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30));
+ regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c);
+ outl(mask & 0xffff0000UL, regaddr);
+}
+
+static inline void
+eiger_enable_irq(unsigned int irq)
+{
+ unsigned long mask;
+ mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
+ eiger_update_irq_hw(irq, mask);
+}
+
+static void
+eiger_disable_irq(unsigned int irq)
+{
+ unsigned long mask;
+ mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
+ eiger_update_irq_hw(irq, mask);
+}
+
+static unsigned int
+eiger_startup_irq(unsigned int irq)
+{
+ eiger_enable_irq(irq);
+ return 0; /* never anything pending */
+}
+
+static void
+eiger_end_irq(unsigned int irq)
+{
+ if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+ eiger_enable_irq(irq);
+}
+
+static struct hw_interrupt_type eiger_irq_type = {
+ .typename = "EIGER",
+ .startup = eiger_startup_irq,
+ .shutdown = eiger_disable_irq,
+ .enable = eiger_enable_irq,
+ .disable = eiger_disable_irq,
+ .ack = eiger_disable_irq,
+ .end = eiger_end_irq,
+};
+
+static void
+eiger_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+ unsigned intstatus;
+
+ /*
+ * The PALcode will have passed us vectors 0x800 or 0x810,
+ * which are fairly arbitrary values and serve only to tell
+ * us whether an interrupt has come in on IRQ0 or IRQ1. If
+ * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's
+ * probably ISA, but PCI interrupts can come through IRQ0
+ * as well if the interrupt controller isn't in accelerated
+ * mode.
+ *
+ * OTOH, the accelerator thing doesn't seem to be working
+ * overly well, so what we'll do instead is try directly
+ * examining the Master Interrupt Register to see if it's a
+ * PCI interrupt, and if _not_ then we'll pass it on to the
+ * ISA handler.
+ */
+
+ intstatus = inw(0x500) & 15;
+ if (intstatus) {
+ /*
+ * This is a PCI interrupt. Check each bit and
+ * despatch an interrupt if it's set.
+ */
+
+ if (intstatus & 8) handle_irq(16+3, regs);
+ if (intstatus & 4) handle_irq(16+2, regs);
+ if (intstatus & 2) handle_irq(16+1, regs);
+ if (intstatus & 1) handle_irq(16+0, regs);
+ } else {
+ isa_device_interrupt(vector, regs);
+ }
+}
+
+static void
+eiger_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+ int irq = (vector - 0x800) >> 4;
+ handle_irq(irq, regs);
+}
+
+static void __init
+eiger_init_irq(void)
+{
+ long i;
+
+ outb(0, DMA1_RESET_REG);
+ outb(0, DMA2_RESET_REG);
+ outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
+ outb(0, DMA2_MASK_REG);
+
+ if (alpha_using_srm)
+ alpha_mv.device_interrupt = eiger_srm_device_interrupt;
+
+ for (i = 16; i < 128; i += 16)
+ eiger_update_irq_hw(i, -1);
+
+ init_i8259a_irqs();
+
+ for (i = 16; i < 128; ++i) {
+ irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
+ irq_desc[i].handler = &eiger_irq_type;
+ }
+}
+
+static int __init
+eiger_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+ u8 irq_orig;
+
+ /* The SRM console has already calculated out the IRQ value's for
+ option cards. As this works lets just read in the value already
+ set and change it to a useable value by Linux.
+
+ All the IRQ values generated by the console are greater than 90,
+ so we subtract 80 because it is (90 - allocated ISA IRQ's). */
+
+ pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq_orig);
+
+ return irq_orig - 0x80;
+}
+
+static u8 __init
+eiger_swizzle(struct pci_dev *dev, u8 *pinp)
+{
+ struct pci_controller *hose = dev->sysdata;
+ int slot, pin = *pinp;
+ int bridge_count = 0;
+
+ /* Find the number of backplane bridges. */
+ int backplane = inw(0x502) & 0x0f;
+
+ switch (backplane)
+ {
+ case 0x00: bridge_count = 0; break; /* No bridges */
+ case 0x01: bridge_count = 1; break; /* 1 */
+ case 0x03: bridge_count = 2; break; /* 2 */
+ case 0x07: bridge_count = 3; break; /* 3 */
+ case 0x0f: bridge_count = 4; break; /* 4 */
+ };
+
+ slot = PCI_SLOT(dev->devfn);
+ while (dev->bus->self) {
+ /* Check for built-in bridges on hose 0. */
+ if (hose->index == 0
+ && (PCI_SLOT(dev->bus->self->devfn)
+ > 20 - bridge_count)) {
+ slot = PCI_SLOT(dev->devfn);
+ break;
+ }
+ /* Must be a card-based bridge. */
+ pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
+
+ /* Move up the chain of bridges. */
+ dev = dev->bus->self;
+ }
+ *pinp = pin;
+ return slot;
+}
+
+/*
+ * The System Vectors
+ */
+
+struct alpha_machine_vector eiger_mv __initmv = {
+ .vector_name = "Eiger",
+ DO_EV6_MMU,
+ DO_DEFAULT_RTC,
+ DO_TSUNAMI_IO,
+ .machine_check = tsunami_machine_check,
+ .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
+ .min_io_address = DEFAULT_IO_BASE,
+ .min_mem_address = DEFAULT_MEM_BASE,
+ .pci_dac_offset = TSUNAMI_DAC_OFFSET,
+
+ .nr_irqs = 128,
+ .device_interrupt = eiger_device_interrupt,
+
+ .init_arch = tsunami_init_arch,
+ .init_irq = eiger_init_irq,
+ .init_rtc = common_init_rtc,
+ .init_pci = common_init_pci,
+ .kill_arch = tsunami_kill_arch,
+ .pci_map_irq = eiger_map_irq,
+ .pci_swizzle = eiger_swizzle,
+};
+ALIAS_MV(eiger)