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Diffstat (limited to 'arch/alpha/kernel/sys_miata.c')
| -rw-r--r-- | arch/alpha/kernel/sys_miata.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/arch/alpha/kernel/sys_miata.c b/arch/alpha/kernel/sys_miata.c new file mode 100644 index 0000000000..e1bee8f84c --- /dev/null +++ b/arch/alpha/kernel/sys_miata.c @@ -0,0 +1,294 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/arch/alpha/kernel/sys_miata.c + * + * Copyright (C) 1995 David A Rusling + * Copyright (C) 1996 Jay A Estabrook + * Copyright (C) 1998, 1999, 2000 Richard Henderson + * + * Code supporting the MIATA (EV56+PYXIS). + */ + +#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/reboot.h> + +#include <asm/ptrace.h> +#include <asm/dma.h> +#include <asm/irq.h> +#include <asm/mmu_context.h> +#include <asm/io.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" + + +static void +miata_srm_device_interrupt(unsigned long vector) +{ + int irq; + + irq = (vector - 0x800) >> 4; + + /* + * I really hate to do this, but the MIATA SRM console ignores the + * low 8 bits in the interrupt summary register, and reports the + * vector 0x80 *lower* than I expected from the bit numbering in + * the documentation. + * This was done because the low 8 summary bits really aren't used + * for reporting any interrupts (the PCI-ISA bridge, bit 7, isn't + * used for this purpose, as PIC interrupts are delivered as the + * vectors 0x800-0x8f0). + * But I really don't want to change the fixup code for allocation + * of IRQs, nor the alpha_irq_mask maintenance stuff, both of which + * look nice and clean now. + * So, here's this grotty hack... :-( + */ + if (irq >= 16) + irq = irq + 8; + + handle_irq(irq); +} + +static void __init +miata_init_irq(void) +{ + if (alpha_using_srm) + alpha_mv.device_interrupt = miata_srm_device_interrupt; + +#if 0 + /* These break on MiataGL so we'll try not to do it at all. */ + *(vulp)PYXIS_INT_HILO = 0x000000B2UL; mb(); /* ISA/NMI HI */ + *(vulp)PYXIS_RT_COUNT = 0UL; mb(); /* clear count */ +#endif + + init_i8259a_irqs(); + + /* Not interested in the bogus interrupts (3,10), Fan Fault (0), + NMI (1), or EIDE (9). + + We also disable the risers (4,5), since we don't know how to + route the interrupts behind the bridge. */ + init_pyxis_irqs(0x63b0000); + + common_init_isa_dma(); + if (request_irq(16 + 2, no_action, 0, "halt-switch", NULL)) + pr_err("Failed to register halt-switch interrupt\n"); + if (request_irq(16 + 6, no_action, 0, "timer-cascade", NULL)) + pr_err("Failed to register timer-cascade interrupt\n"); +} + + +/* + * PCI Fixup configuration. + * + * Summary @ PYXIS_INT_REQ: + * Bit Meaning + * 0 Fan Fault + * 1 NMI + * 2 Halt/Reset switch + * 3 none + * 4 CID0 (Riser ID) + * 5 CID1 (Riser ID) + * 6 Interval timer + * 7 PCI-ISA Bridge + * 8 Ethernet + * 9 EIDE (deprecated, ISA 14/15 used) + *10 none + *11 USB + *12 Interrupt Line A from slot 4 + *13 Interrupt Line B from slot 4 + *14 Interrupt Line C from slot 4 + *15 Interrupt Line D from slot 4 + *16 Interrupt Line A from slot 5 + *17 Interrupt line B from slot 5 + *18 Interrupt Line C from slot 5 + *19 Interrupt Line D from slot 5 + *20 Interrupt Line A from slot 1 + *21 Interrupt Line B from slot 1 + *22 Interrupt Line C from slot 1 + *23 Interrupt Line D from slot 1 + *24 Interrupt Line A from slot 2 + *25 Interrupt Line B from slot 2 + *26 Interrupt Line C from slot 2 + *27 Interrupt Line D from slot 2 + *27 Interrupt Line A from slot 3 + *29 Interrupt Line B from slot 3 + *30 Interrupt Line C from slot 3 + *31 Interrupt Line D from slot 3 + * + * The device to slot mapping looks like: + * + * Slot Device + * 3 DC21142 Ethernet + * 4 EIDE CMD646 + * 5 none + * 6 USB + * 7 PCI-ISA bridge + * 8 PCI-PCI Bridge (SBU Riser) + * 9 none + * 10 none + * 11 PCI on board slot 4 (SBU Riser) + * 12 PCI on board slot 5 (SBU Riser) + * + * These are behind the bridge, so I'm not sure what to do... + * + * 13 PCI on board slot 1 (SBU Riser) + * 14 PCI on board slot 2 (SBU Riser) + * 15 PCI on board slot 3 (SBU Riser) + * + * + * This two layered interrupt approach means that we allocate IRQ 16 and + * above for PCI interrupts. The IRQ relates to which bit the interrupt + * comes in on. This makes interrupt processing much easier. + */ + +static int +miata_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +{ + static char irq_tab[18][5] = { + /*INT INTA INTB INTC INTD */ + {16+ 8, 16+ 8, 16+ 8, 16+ 8, 16+ 8}, /* IdSel 14, DC21142 */ + { -1, -1, -1, -1, -1}, /* IdSel 15, EIDE */ + { -1, -1, -1, -1, -1}, /* IdSel 16, none */ + { -1, -1, -1, -1, -1}, /* IdSel 17, none */ + { -1, -1, -1, -1, -1}, /* IdSel 18, PCI-ISA */ + { -1, -1, -1, -1, -1}, /* IdSel 19, PCI-PCI */ + { -1, -1, -1, -1, -1}, /* IdSel 20, none */ + { -1, -1, -1, -1, -1}, /* IdSel 21, none */ + {16+12, 16+12, 16+13, 16+14, 16+15}, /* IdSel 22, slot 4 */ + {16+16, 16+16, 16+17, 16+18, 16+19}, /* IdSel 23, slot 5 */ + /* the next 7 are actually on PCI bus 1, across the bridge */ + {16+11, 16+11, 16+11, 16+11, 16+11}, /* IdSel 24, QLISP/GL*/ + { -1, -1, -1, -1, -1}, /* IdSel 25, none */ + { -1, -1, -1, -1, -1}, /* IdSel 26, none */ + { -1, -1, -1, -1, -1}, /* IdSel 27, none */ + {16+20, 16+20, 16+21, 16+22, 16+23}, /* IdSel 28, slot 1 */ + {16+24, 16+24, 16+25, 16+26, 16+27}, /* IdSel 29, slot 2 */ + {16+28, 16+28, 16+29, 16+30, 16+31}, /* IdSel 30, slot 3 */ + /* This bridge is on the main bus of the later orig MIATA */ + { -1, -1, -1, -1, -1}, /* IdSel 31, PCI-PCI */ + }; + const long min_idsel = 3, max_idsel = 20, irqs_per_slot = 5; + + /* the USB function of the 82c693 has it's interrupt connected to + the 2nd 8259 controller. So we have to check for it first. */ + + if((slot == 7) && (PCI_FUNC(dev->devfn) == 3)) { + u8 irq=0; + struct pci_dev *pdev = pci_get_slot(dev->bus, dev->devfn & ~7); + if(pdev == NULL || pci_read_config_byte(pdev, 0x40,&irq) != PCIBIOS_SUCCESSFUL) { + pci_dev_put(pdev); + return -1; + } + else { + pci_dev_put(pdev); + return irq; + } + } + + return COMMON_TABLE_LOOKUP; +} + +static u8 +miata_swizzle(struct pci_dev *dev, u8 *pinp) +{ + int slot, pin = *pinp; + + if (dev->bus->number == 0) { + slot = PCI_SLOT(dev->devfn); + } + /* Check for the built-in bridge. */ + else if ((PCI_SLOT(dev->bus->self->devfn) == 8) || + (PCI_SLOT(dev->bus->self->devfn) == 20)) { + slot = PCI_SLOT(dev->devfn) + 9; + } + else + { + /* Must be a card-based bridge. */ + do { + if ((PCI_SLOT(dev->bus->self->devfn) == 8) || + (PCI_SLOT(dev->bus->self->devfn) == 20)) { + slot = PCI_SLOT(dev->devfn) + 9; + break; + } + pin = pci_swizzle_interrupt_pin(dev, pin); + + /* Move up the chain of bridges. */ + dev = dev->bus->self; + /* Slot of the next bridge. */ + slot = PCI_SLOT(dev->devfn); + } while (dev->bus->self); + } + *pinp = pin; + return slot; +} + +static void __init +miata_init_pci(void) +{ + cia_init_pci(); + SMC669_Init(0); /* it might be a GL (fails harmlessly if not) */ + es1888_init(); +} + +static void +miata_kill_arch(int mode) +{ + cia_kill_arch(mode); + +#ifndef ALPHA_RESTORE_SRM_SETUP + switch(mode) { + case LINUX_REBOOT_CMD_RESTART: + /* Who said DEC engineers have no sense of humor? ;-) */ + if (alpha_using_srm) { + *(vuip) PYXIS_RESET = 0x0000dead; + mb(); + } + break; + case LINUX_REBOOT_CMD_HALT: + break; + case LINUX_REBOOT_CMD_POWER_OFF: + break; + } + + halt(); +#endif +} + + +/* + * The System Vector + */ + +struct alpha_machine_vector miata_mv __initmv = { + .vector_name = "Miata", + DO_EV5_MMU, + DO_DEFAULT_RTC, + DO_PYXIS_IO, + .machine_check = cia_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 = PYXIS_DAC_OFFSET, + + .nr_irqs = 48, + .device_interrupt = pyxis_device_interrupt, + + .init_arch = pyxis_init_arch, + .init_irq = miata_init_irq, + .init_rtc = common_init_rtc, + .init_pci = miata_init_pci, + .kill_arch = miata_kill_arch, + .pci_map_irq = miata_map_irq, + .pci_swizzle = miata_swizzle, +}; +ALIAS_MV(miata) |