// SPDX-License-Identifier: GPL-2.0
/*
 *      linux/arch/alpha/kernel/sys_sx164.c
 *
 *      Copyright (C) 1995 David A Rusling
 *      Copyright (C) 1996 Jay A Estabrook
 *      Copyright (C) 1998, 1999, 2000 Richard Henderson
 *
 * Code supporting the SX164 (PCA56+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/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/pgtable.h>
#include <asm/core_cia.h>
#include <asm/hwrpb.h>
#include <asm/tlbflush.h>
#include <asm/special_insns.h>

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


static void __init
sx164_init_irq(void)
{
        outb(0, DMA1_RESET_REG);
        outb(0, DMA2_RESET_REG);
        outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
        outb(0, DMA2_MASK_REG);

        if (alpha_using_srm)
                alpha_mv.device_interrupt = srm_device_interrupt;

        init_i8259a_irqs();

        /* Not interested in the bogus interrupts (0,3,4,5,40-47),
           NMI (1), or HALT (2).  */
        if (alpha_using_srm)
                init_srm_irqs(40, 0x3f0000);
        else
                init_pyxis_irqs(0xff00003f0000UL);

        setup_irq(16+6, &timer_cascade_irqaction);
}

/*
 * PCI Fixup configuration.
 *
 * Summary @ PYXIS_INT_REQ:
 * Bit      Meaning
 * 0        RSVD
 * 1        NMI
 * 2        Halt/Reset switch
 * 3        MBZ
 * 4        RAZ
 * 5        RAZ
 * 6        Interval timer (RTC)
 * 7        PCI-ISA Bridge
 * 8        Interrupt Line A from slot 3
 * 9        Interrupt Line A from slot 2
 *10        Interrupt Line A from slot 1
 *11        Interrupt Line A from slot 0
 *12        Interrupt Line B from slot 3
 *13        Interrupt Line B from slot 2
 *14        Interrupt Line B from slot 1
 *15        Interrupt line B from slot 0
 *16        Interrupt Line C from slot 3
 *17        Interrupt Line C from slot 2
 *18        Interrupt Line C from slot 1
 *19        Interrupt Line C from slot 0
 *20        Interrupt Line D from slot 3
 *21        Interrupt Line D from slot 2
 *22        Interrupt Line D from slot 1
 *23        Interrupt Line D from slot 0
 *
 * IdSel       
 *   5  32 bit PCI option slot 2
 *   6  64 bit PCI option slot 0
 *   7  64 bit PCI option slot 1
 *   8  Cypress I/O
 *   9  32 bit PCI option slot 3
 */

static int
sx164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
        static char irq_tab[5][5] = {
                /*INT    INTA   INTB   INTC   INTD */
                { 16+ 9, 16+ 9, 16+13, 16+17, 16+21}, /* IdSel 5 slot 2 J17 */
                { 16+11, 16+11, 16+15, 16+19, 16+23}, /* IdSel 6 slot 0 J19 */
                { 16+10, 16+10, 16+14, 16+18, 16+22}, /* IdSel 7 slot 1 J18 */
                {    -1,    -1,    -1,    -1,    -1}, /* IdSel 8 SIO        */
                { 16+ 8, 16+ 8, 16+12, 16+16, 16+20}  /* IdSel 9 slot 3 J15 */
        };
        const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
        return COMMON_TABLE_LOOKUP;
}

static void __init
sx164_init_pci(void)
{
        cia_init_pci();
        SMC669_Init(0);
}

static void __init
sx164_init_arch(void)
{
        /*
         * OSF palcode v1.23 forgets to enable PCA56 Motion Video
         * Instructions. Let's enable it.
         * We have to check palcode revision because CSERVE interface
         * is subject to change without notice. For example, it
         * has been changed completely since v1.16 (found in MILO
         * distribution). -ink
         */
        struct percpu_struct *cpu = (struct percpu_struct*)
                ((char*)hwrpb + hwrpb->processor_offset);

        if (amask(AMASK_MAX) != 0
            && alpha_using_srm
            && (cpu->pal_revision & 0xffff) <= 0x117) {
                __asm__ __volatile__(
                "lda    $16,8($31)\n"
                "call_pal 9\n"          /* Allow PALRES insns in kernel mode */
                ".long  0x64000118\n\n" /* hw_mfpr $0,icsr */
                "ldah   $16,(1<<(19-16))($31)\n"
                "or     $0,$16,$0\n"    /* set MVE bit */
                ".long  0x74000118\n"   /* hw_mtpr $0,icsr */
                "lda    $16,9($31)\n"
                "call_pal 9"            /* Disable PALRES insns */
                : : : "$0", "$16");
                printk("PCA56 MVI set enabled\n");
        }

        pyxis_init_arch();
}

/*
 * The System Vector
 */

struct alpha_machine_vector sx164_mv __initmv = {
        .vector_name            = "SX164",
        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              = sx164_init_arch,
        .init_irq               = sx164_init_irq,
        .init_rtc               = common_init_rtc,
        .init_pci               = sx164_init_pci,
        .kill_arch              = cia_kill_arch,
        .pci_map_irq            = sx164_map_irq,
        .pci_swizzle            = common_swizzle,
};
ALIAS_MV(sx164)