// SPDX-License-Identifier: GPL-2.0
/*
 *      linux/arch/alpha/kernel/sys_nautilus.c
 *
 *      Copyright (C) 1995 David A Rusling
 *      Copyright (C) 1998 Richard Henderson
 *      Copyright (C) 1999 Alpha Processor, Inc.,
 *              (David Daniel, Stig Telfer, Soohoon Lee)
 *
 * Code supporting NAUTILUS systems.
 *
 *
 * NAUTILUS has the following I/O features:
 *
 * a) Driven by AMD 751 aka IRONGATE (northbridge):
 *     4 PCI slots
 *     1 AGP slot
 *
 * b) Driven by ALI M1543C (southbridge)
 *     2 ISA slots
 *     2 IDE connectors
 *     1 dual drive capable FDD controller
 *     2 serial ports
 *     1 ECP/EPP/SP parallel port
 *     2 USB ports
 */

#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 <linux/memblock.h>
#include <linux/bitops.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_irongate.h>
#include <asm/hwrpb.h>
#include <asm/tlbflush.h>

#include "proto.h"
#include "err_impl.h"
#include "irq_impl.h"
#include "pci_impl.h"
#include "machvec_impl.h"


static void __init
nautilus_init_irq(void)
{
        if (alpha_using_srm) {
                alpha_mv.device_interrupt = srm_device_interrupt;
        }

        init_i8259a_irqs();
        common_init_isa_dma();
}

static int
nautilus_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
        /* Preserve the IRQ set up by the console.  */

        u8 irq;
        /* UP1500: AGP INTA is actually routed to IRQ 5, not IRQ 10 as
           console reports. Check the device id of AGP bridge to distinguish
           UP1500 from UP1000/1100. Note: 'pin' is 2 due to bridge swizzle. */
        if (slot == 1 && pin == 2 &&
            dev->bus->self && dev->bus->self->device == 0x700f)
                return 5;
        pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
        return irq;
}

static void
nautilus_kill_arch(int mode)
{
        struct pci_bus *bus = pci_isa_hose->bus;
        u32 pmuport;
        int off;

        switch (mode) {
        case LINUX_REBOOT_CMD_RESTART:
                if (! alpha_using_srm) {
                        u8 t8;
                        pci_bus_read_config_byte(bus, 0x38, 0x43, &t8);
                        pci_bus_write_config_byte(bus, 0x38, 0x43, t8 | 0x80);
                        outb(1, 0x92);
                        outb(0, 0x92);
                        /* NOTREACHED */
                }
                break;

        case LINUX_REBOOT_CMD_POWER_OFF:
                /* Assume M1543C */
                off = 0x2000;           /* SLP_TYPE = 0, SLP_EN = 1 */
                pci_bus_read_config_dword(bus, 0x88, 0x10, &pmuport);
                if (!pmuport) {
                        /* M1535D/D+ */
                        off = 0x3400;   /* SLP_TYPE = 5, SLP_EN = 1 */
                        pci_bus_read_config_dword(bus, 0x88, 0xe0, &pmuport);
                }
                pmuport &= 0xfffe;
                outw(0xffff, pmuport);  /* Clear pending events. */
                outw(off, pmuport + 4);
                /* NOTREACHED */
                break;
        }
}

/* Perform analysis of a machine check that arrived from the system (NMI) */

static void
naut_sys_machine_check(unsigned long vector, unsigned long la_ptr,
                       struct pt_regs *regs)
{
        printk("PC %lx RA %lx\n", regs->pc, regs->r26);
        irongate_pci_clr_err();
}

/* Machine checks can come from two sources - those on the CPU and those
   in the system.  They are analysed separately but all starts here.  */

static void
nautilus_machine_check(unsigned long vector, unsigned long la_ptr)
{
        char *mchk_class;

        /* Now for some analysis.  Machine checks fall into two classes --
           those picked up by the system, and those picked up by the CPU.
           Add to that the two levels of severity - correctable or not.  */

        if (vector == SCB_Q_SYSMCHK
            && ((IRONGATE0->dramms & 0x300) == 0x300)) {
                unsigned long nmi_ctl;

                /* Clear ALI NMI */
                nmi_ctl = inb(0x61);
                nmi_ctl |= 0x0c;
                outb(nmi_ctl, 0x61);
                nmi_ctl &= ~0x0c;
                outb(nmi_ctl, 0x61);

                /* Write again clears error bits.  */
                IRONGATE0->stat_cmd = IRONGATE0->stat_cmd & ~0x100;
                mb();
                IRONGATE0->stat_cmd;

                /* Write again clears error bits.  */
                IRONGATE0->dramms = IRONGATE0->dramms;
                mb();
                IRONGATE0->dramms;

                draina();
                wrmces(0x7);
                mb();
                return;
        }

        if (vector == SCB_Q_SYSERR)
                mchk_class = "Correctable";
        else if (vector == SCB_Q_SYSMCHK)
                mchk_class = "Fatal";
        else {
                ev6_machine_check(vector, la_ptr);
                return;
        }

        printk(KERN_CRIT "NAUTILUS Machine check 0x%lx "
                         "[%s System Machine Check (NMI)]\n",
               vector, mchk_class);

        naut_sys_machine_check(vector, la_ptr, get_irq_regs());

        /* Tell the PALcode to clear the machine check */
        draina();
        wrmces(0x7);
        mb();
}

static struct resource irongate_mem = {
        .name   = "Irongate PCI MEM",
        .flags  = IORESOURCE_MEM,
};
static struct resource busn_resource = {
        .name   = "PCI busn",
        .start  = 0,
        .end    = 255,
        .flags  = IORESOURCE_BUS,
};

static void __init
nautilus_init_pci(void)
{
        struct pci_controller *hose = hose_head;
        struct pci_host_bridge *bridge;
        struct pci_bus *bus;
        unsigned long bus_align, bus_size, pci_mem;
        unsigned long memtop = max_low_pfn << PAGE_SHIFT;

        bridge = pci_alloc_host_bridge(0);
        if (!bridge)
                return;

        /* Use default IO. */
        pci_add_resource(&bridge->windows, &ioport_resource);
        /* Irongate PCI memory aperture, calculate required size before
           setting it up. */
        pci_add_resource(&bridge->windows, &irongate_mem);

        pci_add_resource(&bridge->windows, &busn_resource);
        bridge->dev.parent = NULL;
        bridge->sysdata = hose;
        bridge->busnr = 0;
        bridge->ops = alpha_mv.pci_ops;
        bridge->swizzle_irq = alpha_mv.pci_swizzle;
        bridge->map_irq = alpha_mv.pci_map_irq;
        bridge->size_windows = 1;

        /* Scan our single hose.  */
        if (pci_scan_root_bus_bridge(bridge)) {
                pci_free_host_bridge(bridge);
                return;
        }
        bus = hose->bus = bridge->bus;
        pcibios_claim_one_bus(bus);

        pci_bus_size_bridges(bus);

        /* Now we've got the size and alignment of PCI memory resources
           stored in irongate_mem. Set up the PCI memory range: limit is
           hardwired to 0xffffffff, base must be aligned to 16Mb. */
        bus_align = irongate_mem.start;
        bus_size = irongate_mem.end + 1 - bus_align;
        if (bus_align < 0x1000000UL)
                bus_align = 0x1000000UL;

        pci_mem = (0x100000000UL - bus_size) & -bus_align;
        irongate_mem.start = pci_mem;
        irongate_mem.end = 0xffffffffUL;

        /* Register our newly calculated PCI memory window in the resource
           tree. */
        if (request_resource(&iomem_resource, &irongate_mem) < 0)
                printk(KERN_ERR "Failed to request MEM on hose 0\n");

        printk(KERN_INFO "Irongate pci_mem %pR\n", &irongate_mem);

        if (pci_mem < memtop)
                memtop = pci_mem;
        if (memtop > alpha_mv.min_mem_address) {
                free_reserved_area(__va(alpha_mv.min_mem_address),
                                   __va(memtop), -1, NULL);
                printk(KERN_INFO "nautilus_init_pci: %ldk freed\n",
                        (memtop - alpha_mv.min_mem_address) >> 10);
        }
        if ((IRONGATE0->dev_vendor >> 16) > 0x7006)     /* Albacore? */
                IRONGATE0->pci_mem = pci_mem;

        pci_bus_assign_resources(bus);
        pci_bus_add_devices(bus);
}

/*
 * The System Vectors
 */

struct alpha_machine_vector nautilus_mv __initmv = {
        .vector_name            = "Nautilus",
        DO_EV6_MMU,
        DO_DEFAULT_RTC,
        DO_IRONGATE_IO,
        .machine_check          = nautilus_machine_check,
        .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
        .min_io_address         = DEFAULT_IO_BASE,
        .min_mem_address        = IRONGATE_DEFAULT_MEM_BASE,

        .nr_irqs                = 16,
        .device_interrupt       = isa_device_interrupt,

        .init_arch              = irongate_init_arch,
        .init_irq               = nautilus_init_irq,
        .init_rtc               = common_init_rtc,
        .init_pci               = nautilus_init_pci,
        .kill_arch              = nautilus_kill_arch,
        .pci_map_irq            = nautilus_map_irq,
        .pci_swizzle            = common_swizzle,
};
ALIAS_MV(nautilus)