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!

1 files changed, 296 insertions, 0 deletions

diff --git a/arch/alpha/kernel/sys_takara.c b/arch/alpha/kernel/sys_takara.c
new file mode 100644
index 000000000000..7955bdfc2db0
--- /dev/null
+++ b/arch/alpha/kernel/sys_takara.c
@@ -0,0 +1,296 @@
+/*
+ *      linux/arch/alpha/kernel/sys_takara.c
+ *
+ *      Copyright (C) 1995 David A Rusling
+ *      Copyright (C) 1996 Jay A Estabrook
+ *      Copyright (C) 1998, 1999 Richard Henderson
+ *
+ * Code supporting the TAKARA.
+ */
+
+#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/mmu_context.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/core_cia.h>
+#include <asm/tlbflush.h>
+
+#include "proto.h"
+#include "irq_impl.h"
+#include "pci_impl.h"
+#include "machvec_impl.h"
+
+
+/* Note mask bit is true for DISABLED irqs.  */
+static unsigned long cached_irq_mask[2] = { -1, -1 };
+
+static inline void
+takara_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
+takara_enable_irq(unsigned int irq)
+{
+        unsigned long mask;
+        mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
+        takara_update_irq_hw(irq, mask);
+}
+
+static void
+takara_disable_irq(unsigned int irq)
+{
+        unsigned long mask;
+        mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
+        takara_update_irq_hw(irq, mask);
+}
+
+static unsigned int
+takara_startup_irq(unsigned int irq)
+{
+        takara_enable_irq(irq);
+        return 0; /* never anything pending */
+}
+
+static void
+takara_end_irq(unsigned int irq)
+{
+        if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+                takara_enable_irq(irq);
+}
+
+static struct hw_interrupt_type takara_irq_type = {
+        .typename       = "TAKARA",
+        .startup        = takara_startup_irq,
+        .shutdown       = takara_disable_irq,
+        .enable         = takara_enable_irq,
+        .disable        = takara_disable_irq,
+        .ack            = takara_disable_irq,
+        .end            = takara_end_irq,
+};
+
+static void
+takara_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 
+takara_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+        int irq = (vector - 0x800) >> 4;
+        handle_irq(irq, regs);
+}
+
+static void __init
+takara_init_irq(void)
+{
+        long i;
+
+        init_i8259a_irqs();
+
+        if (alpha_using_srm) {
+                alpha_mv.device_interrupt = takara_srm_device_interrupt;
+        } else {
+                unsigned int ctlreg = inl(0x500);
+
+                /* Return to non-accelerated mode.  */
+                ctlreg &= ~0x8000;
+                outl(ctlreg, 0x500);
+
+                /* Enable the PCI interrupt register.  */
+                ctlreg = 0x05107c00;
+                outl(ctlreg, 0x500);
+        }
+
+        for (i = 16; i < 128; i += 16)
+                takara_update_irq_hw(i, -1);
+
+        for (i = 16; i < 128; ++i) {
+                irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
+                irq_desc[i].handler = &takara_irq_type;
+        }
+
+        common_init_isa_dma();
+}
+
+
+/*
+ * The Takara has PCI devices 1, 2, and 3 configured to slots 20,
+ * 19, and 18 respectively, in the default configuration. They can
+ * also be jumpered to slots 8, 7, and 6 respectively, which is fun
+ * because the SIO ISA bridge can also be slot 7. However, the SIO
+ * doesn't explicitly generate PCI-type interrupts, so we can
+ * assign it whatever the hell IRQ we like and it doesn't matter.
+ */
+
+static int __init
+takara_map_irq_srm(struct pci_dev *dev, u8 slot, u8 pin)
+{
+        static char irq_tab[15][5] __initdata = {
+                { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
+                { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
+                { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
+                /* These are behind the bridges.  */
+                {   12,   12,   13,   14,   15},   /* slot 12 == nothing */
+                {    8,    8,    9,   19,   11},   /* slot 13 == nothing */
+                {    4,    4,    5,    6,    7},   /* slot 14 == nothing */
+                {    0,    0,    1,    2,    3},   /* slot 15 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
+                {64+ 0, 64+0, 64+1, 64+2, 64+3},   /* slot 17= device 4 */
+                {48+ 0, 48+0, 48+1, 48+2, 48+3},   /* slot 18= device 3 */
+                {32+ 0, 32+0, 32+1, 32+2, 32+3},   /* slot 19= device 2 */
+                {16+ 0, 16+0, 16+1, 16+2, 16+3},   /* slot 20= device 1 */
+        };
+        const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
+        int irq = COMMON_TABLE_LOOKUP;
+        if (irq >= 0 && irq < 16) {
+                /* Guess that we are behind a bridge.  */
+                unsigned int busslot = PCI_SLOT(dev->bus->self->devfn);
+                irq += irq_tab[busslot-min_idsel][0];
+        }
+        return irq;
+}
+
+static int __init
+takara_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+        static char irq_tab[15][5] __initdata = {
+                { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
+                { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
+                { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 12 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 13 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 14 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 15 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
+                {   -1,   -1,   -1,   -1,   -1},   /* slot 17 == nothing */
+                { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot 18 == device 3 */
+                { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot 19 == device 2 */
+                { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot 20 == device 1 */
+        };
+        const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
+        return COMMON_TABLE_LOOKUP;
+}
+
+static u8 __init
+takara_swizzle(struct pci_dev *dev, u8 *pinp)
+{
+        int slot = PCI_SLOT(dev->devfn);
+        int pin = *pinp;
+        unsigned int ctlreg = inl(0x500);
+        unsigned int busslot;
+
+        if (!dev->bus->self)
+                return slot;
+
+        busslot = PCI_SLOT(dev->bus->self->devfn);
+        /* Check for built-in bridges.  */
+        if (dev->bus->number != 0
+            && busslot > 16
+            && ((1<<(36-busslot)) & ctlreg)) {
+                if (pin == 1)
+                        pin += (20 - busslot);
+                else {
+                        printk(KERN_WARNING "takara_swizzle: can only "
+                               "handle cards with INTA IRQ pin.\n");
+                }
+        } else {
+                /* Must be a card-based bridge.  */
+                printk(KERN_WARNING "takara_swizzle: cannot handle "
+                       "card-bridge behind builtin bridge yet.\n");
+        }
+
+        *pinp = pin;
+        return slot;
+}
+
+static void __init
+takara_init_pci(void)
+{
+        if (alpha_using_srm)
+                alpha_mv.pci_map_irq = takara_map_irq_srm;
+
+        cia_init_pci();
+        ns87312_enable_ide(0x26e);
+}
+
+
+/*
+ * The System Vector
+ */
+
+struct alpha_machine_vector takara_mv __initmv = {
+        .vector_name            = "Takara",
+        DO_EV5_MMU,
+        DO_DEFAULT_RTC,
+        DO_CIA_IO,
+        .machine_check          = cia_machine_check,
+        .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
+        .min_io_address         = DEFAULT_IO_BASE,
+        .min_mem_address        = CIA_DEFAULT_MEM_BASE,
+
+        .nr_irqs                = 128,
+        .device_interrupt       = takara_device_interrupt,
+
+        .init_arch              = cia_init_arch,
+        .init_irq               = takara_init_irq,
+        .init_rtc               = common_init_rtc,
+        .init_pci               = takara_init_pci,
+        .kill_arch              = cia_kill_arch,
+        .pci_map_irq            = takara_map_irq,
+        .pci_swizzle            = takara_swizzle,
+};
+ALIAS_MV(takara)