diff options
Diffstat (limited to 'arch/alpha/kernel/sys_ruffian.c')
| -rw-r--r-- | arch/alpha/kernel/sys_ruffian.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/arch/alpha/kernel/sys_ruffian.c b/arch/alpha/kernel/sys_ruffian.c new file mode 100644 index 000000000..4b1c8d85c --- /dev/null +++ b/arch/alpha/kernel/sys_ruffian.c @@ -0,0 +1,240 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/arch/alpha/kernel/sys_ruffian.c + * + * Copyright (C) 1995 David A Rusling + * Copyright (C) 1996 Jay A Estabrook + * Copyright (C) 1998, 1999, 2000 Richard Henderson + * + * Code supporting the RUFFIAN. + */ + +#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/timex.h> +#include <linux/init.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 __init +ruffian_init_irq(void) +{ + /* Invert 6&7 for i82371 */ + *(vulp)PYXIS_INT_HILO = 0x000000c0UL; mb(); + *(vulp)PYXIS_INT_CNFG = 0x00002064UL; mb(); /* all clear */ + + 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); + + /* Finish writing the 82C59A PIC Operation Control Words */ + outb(0x20,0xA0); + outb(0x20,0x20); + + init_i8259a_irqs(); + + /* Not interested in the bogus interrupts (0,3,6), + NMI (1), HALT (2), flash (5), or 21142 (8). */ + init_pyxis_irqs(0x16f0000); + + common_init_isa_dma(); +} + +#define RUFFIAN_LATCH DIV_ROUND_CLOSEST(PIT_TICK_RATE, HZ) + +static void __init +ruffian_init_rtc(void) +{ + /* Ruffian does not have the RTC connected to the CPU timer + interrupt. Instead, it uses the PIT connected to IRQ 0. */ + + /* Setup interval timer. */ + outb(0x34, 0x43); /* binary, mode 2, LSB/MSB, ch 0 */ + outb(RUFFIAN_LATCH & 0xff, 0x40); /* LSB */ + outb(RUFFIAN_LATCH >> 8, 0x40); /* MSB */ + + outb(0xb6, 0x43); /* pit counter 2: speaker */ + outb(0x31, 0x42); + outb(0x13, 0x42); + + if (request_irq(0, rtc_timer_interrupt, 0, "timer", NULL)) + pr_err("Failed to request irq 0 (timer)\n"); +} + +static void +ruffian_kill_arch (int mode) +{ + cia_kill_arch(mode); +#if 0 + /* This only causes re-entry to ARCSBIOS */ + /* Perhaps this works for other PYXIS as well? */ + *(vuip) PYXIS_RESET = 0x0000dead; + mb(); +#endif +} + +/* + * Interrupt routing: + * + * Primary bus + * IdSel INTA INTB INTC INTD + * 21052 13 - - - - + * SIO 14 23 - - - + * 21143 15 44 - - - + * Slot 0 17 43 42 41 40 + * + * Secondary bus + * IdSel INTA INTB INTC INTD + * Slot 0 8 (18) 19 18 17 16 + * Slot 1 9 (19) 31 30 29 28 + * Slot 2 10 (20) 27 26 25 24 + * Slot 3 11 (21) 39 38 37 36 + * Slot 4 12 (22) 35 34 33 32 + * 53c875 13 (23) 20 - - - + * + */ + +static int +ruffian_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +{ + static char irq_tab[11][5] = { + /*INT INTA INTB INTC INTD */ + {-1, -1, -1, -1, -1}, /* IdSel 13, 21052 */ + {-1, -1, -1, -1, -1}, /* IdSel 14, SIO */ + {44, 44, 44, 44, 44}, /* IdSel 15, 21143 */ + {-1, -1, -1, -1, -1}, /* IdSel 16, none */ + {43, 43, 42, 41, 40}, /* IdSel 17, 64-bit slot */ + /* the next 6 are actually on PCI bus 1, across the bridge */ + {19, 19, 18, 17, 16}, /* IdSel 8, slot 0 */ + {31, 31, 30, 29, 28}, /* IdSel 9, slot 1 */ + {27, 27, 26, 25, 24}, /* IdSel 10, slot 2 */ + {39, 39, 38, 37, 36}, /* IdSel 11, slot 3 */ + {35, 35, 34, 33, 32}, /* IdSel 12, slot 4 */ + {20, 20, 20, 20, 20}, /* IdSel 13, 53c875 */ + }; + const long min_idsel = 13, max_idsel = 23, irqs_per_slot = 5; + return COMMON_TABLE_LOOKUP; +} + +static u8 +ruffian_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) == 13) { + slot = PCI_SLOT(dev->devfn) + 10; + } + else + { + /* Must be a card-based bridge. */ + do { + if (PCI_SLOT(dev->bus->self->devfn) == 13) { + slot = PCI_SLOT(dev->devfn) + 10; + 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; +} + +#ifdef BUILDING_FOR_MILO +/* + * 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 < ARRAY_SIZE(size)) + ret = size[bank]; + } + + return ret; +} +#endif /* BUILDING_FOR_MILO */ + +/* + * The System Vector + */ + +struct alpha_machine_vector ruffian_mv __initmv = { + .vector_name = "Ruffian", + DO_EV5_MMU, + DO_DEFAULT_RTC, + DO_PYXIS_IO, + .machine_check = cia_machine_check, + .max_isa_dma_address = ALPHA_RUFFIAN_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 = ruffian_init_irq, + .init_rtc = ruffian_init_rtc, + .init_pci = cia_init_pci, + .kill_arch = ruffian_kill_arch, + .pci_map_irq = ruffian_map_irq, + .pci_swizzle = ruffian_swizzle, +}; +ALIAS_MV(ruffian) |