// 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)