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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_rawhide.c
downloadlinux-stericsson-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_rawhide.c')
-rw-r--r--arch/alpha/kernel/sys_rawhide.c270
1 files changed, 270 insertions, 0 deletions
diff --git a/arch/alpha/kernel/sys_rawhide.c b/arch/alpha/kernel/sys_rawhide.c
new file mode 100644
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+++ b/arch/alpha/kernel/sys_rawhide.c
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+/*
+ * linux/arch/alpha/kernel/sys_rawhide.c
+ *
+ * Copyright (C) 1995 David A Rusling
+ * Copyright (C) 1996 Jay A Estabrook
+ * Copyright (C) 1998, 1999 Richard Henderson
+ *
+ * Code supporting the RAWHIDE.
+ */
+
+#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_mcpcia.h>
+#include <asm/tlbflush.h>
+
+#include "proto.h"
+#include "irq_impl.h"
+#include "pci_impl.h"
+#include "machvec_impl.h"
+
+
+/*
+ * HACK ALERT! only the boot cpu is used for interrupts.
+ */
+
+
+/* Note mask bit is true for ENABLED irqs. */
+
+static unsigned int hose_irq_masks[4] = {
+ 0xff0000, 0xfe0000, 0xff0000, 0xff0000
+};
+static unsigned int cached_irq_masks[4];
+DEFINE_SPINLOCK(rawhide_irq_lock);
+
+static inline void
+rawhide_update_irq_hw(int hose, int mask)
+{
+ *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(hose)) = mask;
+ mb();
+ *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(hose));
+}
+
+static inline void
+rawhide_enable_irq(unsigned int irq)
+{
+ unsigned int mask, hose;
+
+ irq -= 16;
+ hose = irq / 24;
+ irq -= hose * 24;
+ mask = 1 << irq;
+
+ spin_lock(&rawhide_irq_lock);
+ mask |= cached_irq_masks[hose];
+ cached_irq_masks[hose] = mask;
+ rawhide_update_irq_hw(hose, mask);
+ spin_unlock(&rawhide_irq_lock);
+}
+
+static void
+rawhide_disable_irq(unsigned int irq)
+{
+ unsigned int mask, hose;
+
+ irq -= 16;
+ hose = irq / 24;
+ irq -= hose * 24;
+ mask = ~(1 << irq) | hose_irq_masks[hose];
+
+ spin_lock(&rawhide_irq_lock);
+ mask &= cached_irq_masks[hose];
+ cached_irq_masks[hose] = mask;
+ rawhide_update_irq_hw(hose, mask);
+ spin_unlock(&rawhide_irq_lock);
+}
+
+static void
+rawhide_mask_and_ack_irq(unsigned int irq)
+{
+ unsigned int mask, mask1, hose;
+
+ irq -= 16;
+ hose = irq / 24;
+ irq -= hose * 24;
+ mask1 = 1 << irq;
+ mask = ~mask1 | hose_irq_masks[hose];
+
+ spin_lock(&rawhide_irq_lock);
+
+ mask &= cached_irq_masks[hose];
+ cached_irq_masks[hose] = mask;
+ rawhide_update_irq_hw(hose, mask);
+
+ /* Clear the interrupt. */
+ *(vuip)MCPCIA_INT_REQ(MCPCIA_HOSE2MID(hose)) = mask1;
+
+ spin_unlock(&rawhide_irq_lock);
+}
+
+static unsigned int
+rawhide_startup_irq(unsigned int irq)
+{
+ rawhide_enable_irq(irq);
+ return 0;
+}
+
+static void
+rawhide_end_irq(unsigned int irq)
+{
+ if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+ rawhide_enable_irq(irq);
+}
+
+static struct hw_interrupt_type rawhide_irq_type = {
+ .typename = "RAWHIDE",
+ .startup = rawhide_startup_irq,
+ .shutdown = rawhide_disable_irq,
+ .enable = rawhide_enable_irq,
+ .disable = rawhide_disable_irq,
+ .ack = rawhide_mask_and_ack_irq,
+ .end = rawhide_end_irq,
+};
+
+static void
+rawhide_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+ int irq;
+
+ irq = (vector - 0x800) >> 4;
+
+ /*
+ * The RAWHIDE SRM console reports PCI interrupts with a vector
+ * 0x80 *higher* than one might expect, as PCI IRQ 0 (ie bit 0)
+ * shows up as IRQ 24, etc, etc. We adjust it down by 8 to have
+ * it line up with the actual bit numbers from the REQ registers,
+ * which is how we manage the interrupts/mask. Sigh...
+ *
+ * Also, PCI #1 interrupts are offset some more... :-(
+ */
+
+ if (irq == 52) {
+ /* SCSI on PCI1 is special. */
+ irq = 72;
+ }
+
+ /* Adjust by which hose it is from. */
+ irq -= ((irq + 16) >> 2) & 0x38;
+
+ handle_irq(irq, regs);
+}
+
+static void __init
+rawhide_init_irq(void)
+{
+ struct pci_controller *hose;
+ long i;
+
+ mcpcia_init_hoses();
+
+ for (hose = hose_head; hose; hose = hose->next) {
+ unsigned int h = hose->index;
+ unsigned int mask = hose_irq_masks[h];
+
+ cached_irq_masks[h] = mask;
+ *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(h)) = mask;
+ *(vuip)MCPCIA_INT_MASK1(MCPCIA_HOSE2MID(h)) = 0;
+ }
+
+ for (i = 16; i < 128; ++i) {
+ irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
+ irq_desc[i].handler = &rawhide_irq_type;
+ }
+
+ init_i8259a_irqs();
+ common_init_isa_dma();
+}
+
+/*
+ * PCI Fixup configuration.
+ *
+ * Summary @ MCPCIA_PCI0_INT_REQ:
+ * Bit Meaning
+ * 0 Interrupt Line A from slot 2 PCI0
+ * 1 Interrupt Line B from slot 2 PCI0
+ * 2 Interrupt Line C from slot 2 PCI0
+ * 3 Interrupt Line D from slot 2 PCI0
+ * 4 Interrupt Line A from slot 3 PCI0
+ * 5 Interrupt Line B from slot 3 PCI0
+ * 6 Interrupt Line C from slot 3 PCI0
+ * 7 Interrupt Line D from slot 3 PCI0
+ * 8 Interrupt Line A from slot 4 PCI0
+ * 9 Interrupt Line B from slot 4 PCI0
+ * 10 Interrupt Line C from slot 4 PCI0
+ * 11 Interrupt Line D from slot 4 PCI0
+ * 12 Interrupt Line A from slot 5 PCI0
+ * 13 Interrupt Line B from slot 5 PCI0
+ * 14 Interrupt Line C from slot 5 PCI0
+ * 15 Interrupt Line D from slot 5 PCI0
+ * 16 EISA interrupt (PCI 0) or SCSI interrupt (PCI 1)
+ * 17-23 NA
+ *
+ * IdSel
+ * 1 EISA bridge (PCI bus 0 only)
+ * 2 PCI option slot 2
+ * 3 PCI option slot 3
+ * 4 PCI option slot 4
+ * 5 PCI option slot 5
+ *
+ */
+
+static int __init
+rawhide_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+ static char irq_tab[5][5] __initdata = {
+ /*INT INTA INTB INTC INTD */
+ { 16+16, 16+16, 16+16, 16+16, 16+16}, /* IdSel 1 SCSI PCI 1 */
+ { 16+ 0, 16+ 0, 16+ 1, 16+ 2, 16+ 3}, /* IdSel 2 slot 2 */
+ { 16+ 4, 16+ 4, 16+ 5, 16+ 6, 16+ 7}, /* IdSel 3 slot 3 */
+ { 16+ 8, 16+ 8, 16+ 9, 16+10, 16+11}, /* IdSel 4 slot 4 */
+ { 16+12, 16+12, 16+13, 16+14, 16+15} /* IdSel 5 slot 5 */
+ };
+ const long min_idsel = 1, max_idsel = 5, irqs_per_slot = 5;
+
+ struct pci_controller *hose = dev->sysdata;
+ int irq = COMMON_TABLE_LOOKUP;
+ if (irq >= 0)
+ irq += 24 * hose->index;
+ return irq;
+}
+
+
+/*
+ * The System Vector
+ */
+
+struct alpha_machine_vector rawhide_mv __initmv = {
+ .vector_name = "Rawhide",
+ DO_EV5_MMU,
+ DO_DEFAULT_RTC,
+ DO_MCPCIA_IO,
+ .machine_check = mcpcia_machine_check,
+ .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
+ .min_io_address = DEFAULT_IO_BASE,
+ .min_mem_address = MCPCIA_DEFAULT_MEM_BASE,
+ .pci_dac_offset = MCPCIA_DAC_OFFSET,
+
+ .nr_irqs = 128,
+ .device_interrupt = rawhide_srm_device_interrupt,
+
+ .init_arch = mcpcia_init_arch,
+ .init_irq = rawhide_init_irq,
+ .init_rtc = common_init_rtc,
+ .init_pci = common_init_pci,
+ .kill_arch = NULL,
+ .pci_map_irq = rawhide_map_irq,
+ .pci_swizzle = common_swizzle,
+};
+ALIAS_MV(rawhide)