// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 1999, 2000, 2004, 2005  MIPS Technologies, Inc.
 *      All rights reserved.
 *      Authors: Carsten Langgaard <carstenl@mips.com>
 *               Maciej W. Rozycki <macro@mips.com>
 *
 * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
 *
 * MIPS boards specific PCI support.
 */
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <asm/gt64120.h>
#include <asm/mips-cps.h>
#include <asm/mips-boards/generic.h>
#include <asm/mips-boards/bonito64.h>
#include <asm/mips-boards/msc01_pci.h>

static struct resource bonito64_mem_resource = {
        .name   = "Bonito PCI MEM",
        .flags  = IORESOURCE_MEM,
};

static struct resource bonito64_io_resource = {
        .name   = "Bonito PCI I/O",
        .start  = 0x00000000UL,
        .end    = 0x000fffffUL,
        .flags  = IORESOURCE_IO,
};

static struct resource gt64120_mem_resource = {
        .name   = "GT-64120 PCI MEM",
        .flags  = IORESOURCE_MEM,
};

static struct resource gt64120_io_resource = {
        .name   = "GT-64120 PCI I/O",
        .flags  = IORESOURCE_IO,
};

static struct resource msc_mem_resource = {
        .name   = "MSC PCI MEM",
        .flags  = IORESOURCE_MEM,
};

static struct resource msc_io_resource = {
        .name   = "MSC PCI I/O",
        .flags  = IORESOURCE_IO,
};

extern struct pci_ops bonito64_pci_ops;
extern struct pci_ops gt64xxx_pci0_ops;
extern struct pci_ops msc_pci_ops;

static struct pci_controller bonito64_controller = {
        .pci_ops        = &bonito64_pci_ops,
        .io_resource    = &bonito64_io_resource,
        .mem_resource   = &bonito64_mem_resource,
        .io_offset      = 0x00000000UL,
};

static struct pci_controller gt64120_controller = {
        .pci_ops        = &gt64xxx_pci0_ops,
        .io_resource    = &gt64120_io_resource,
        .mem_resource   = &gt64120_mem_resource,
};

static struct pci_controller msc_controller = {
        .pci_ops        = &msc_pci_ops,
        .io_resource    = &msc_io_resource,
        .mem_resource   = &msc_mem_resource,
};

void __init mips_pcibios_init(void)
{
        struct pci_controller *controller;
        resource_size_t start, end, map, start1, end1, map1, map2, map3, mask;

        switch (mips_revision_sconid) {
        case MIPS_REVISION_SCON_GT64120:
                /*
                 * Due to a bug in the Galileo system controller, we need
                 * to setup the PCI BAR for the Galileo internal registers.
                 * This should be done in the bios/bootprom and will be
                 * fixed in a later revision of YAMON (the MIPS boards
                 * boot prom).
                 */
                GT_WRITE(GT_PCI0_CFGADDR_OFS,
                         (0 << GT_PCI0_CFGADDR_BUSNUM_SHF) | /* Local bus */
                         (0 << GT_PCI0_CFGADDR_DEVNUM_SHF) | /* GT64120 dev */
                         (0 << GT_PCI0_CFGADDR_FUNCTNUM_SHF) | /* Function 0*/
                         ((0x20/4) << GT_PCI0_CFGADDR_REGNUM_SHF) | /* BAR 4*/
                         GT_PCI0_CFGADDR_CONFIGEN_BIT);

                /* Perform the write */
                GT_WRITE(GT_PCI0_CFGDATA_OFS, CPHYSADDR(MIPS_GT_BASE));

                /* Set up resource ranges from the controller's registers.  */
                start = GT_READ(GT_PCI0M0LD_OFS);
                end = GT_READ(GT_PCI0M0HD_OFS);
                map = GT_READ(GT_PCI0M0REMAP_OFS);
                end = (end & GT_PCI_HD_MSK) | (start & ~GT_PCI_HD_MSK);
                start1 = GT_READ(GT_PCI0M1LD_OFS);
                end1 = GT_READ(GT_PCI0M1HD_OFS);
                map1 = GT_READ(GT_PCI0M1REMAP_OFS);
                end1 = (end1 & GT_PCI_HD_MSK) | (start1 & ~GT_PCI_HD_MSK);
                /* Cannot support multiple windows, use the wider.  */
                if (end1 - start1 > end - start) {
                        start = start1;
                        end = end1;
                        map = map1;
                }
                mask = ~(start ^ end);
                /* We don't support remapping with a discontiguous mask.  */
                BUG_ON((start & GT_PCI_HD_MSK) != (map & GT_PCI_HD_MSK) &&
                       mask != ~((mask & -mask) - 1));
                gt64120_mem_resource.start = start;
                gt64120_mem_resource.end = end;
                gt64120_controller.mem_offset = (start & mask) - (map & mask);
                /* Addresses are 36-bit, so do shifts in the destinations.  */
                gt64120_mem_resource.start <<= GT_PCI_DCRM_SHF;
                gt64120_mem_resource.end <<= GT_PCI_DCRM_SHF;
                gt64120_mem_resource.end |= (1 << GT_PCI_DCRM_SHF) - 1;
                gt64120_controller.mem_offset <<= GT_PCI_DCRM_SHF;

                start = GT_READ(GT_PCI0IOLD_OFS);
                end = GT_READ(GT_PCI0IOHD_OFS);
                map = GT_READ(GT_PCI0IOREMAP_OFS);
                end = (end & GT_PCI_HD_MSK) | (start & ~GT_PCI_HD_MSK);
                mask = ~(start ^ end);
                /* We don't support remapping with a discontiguous mask.  */
                BUG_ON((start & GT_PCI_HD_MSK) != (map & GT_PCI_HD_MSK) &&
                       mask != ~((mask & -mask) - 1));
                gt64120_io_resource.start = map & mask;
                gt64120_io_resource.end = (map & mask) | ~mask;
                gt64120_controller.io_offset = 0;
                /* Addresses are 36-bit, so do shifts in the destinations.  */
                gt64120_io_resource.start <<= GT_PCI_DCRM_SHF;
                gt64120_io_resource.end <<= GT_PCI_DCRM_SHF;
                gt64120_io_resource.end |= (1 << GT_PCI_DCRM_SHF) - 1;

                controller = &gt64120_controller;
                break;

        case MIPS_REVISION_SCON_BONITO:
                /* Set up resource ranges from the controller's registers.  */
                map = BONITO_PCIMAP;
                map1 = (BONITO_PCIMAP & BONITO_PCIMAP_PCIMAP_LO0) >>
                       BONITO_PCIMAP_PCIMAP_LO0_SHIFT;
                map2 = (BONITO_PCIMAP & BONITO_PCIMAP_PCIMAP_LO1) >>
                       BONITO_PCIMAP_PCIMAP_LO1_SHIFT;
                map3 = (BONITO_PCIMAP & BONITO_PCIMAP_PCIMAP_LO2) >>
                       BONITO_PCIMAP_PCIMAP_LO2_SHIFT;
                /* Combine as many adjacent windows as possible.  */
                map = map1;
                start = BONITO_PCILO0_BASE;
                end = 1;
                if (map3 == map2 + 1) {
                        map = map2;
                        start = BONITO_PCILO1_BASE;
                        end++;
                }
                if (map2 == map1 + 1) {
                        map = map1;
                        start = BONITO_PCILO0_BASE;
                        end++;
                }
                bonito64_mem_resource.start = start;
                bonito64_mem_resource.end = start +
                                            BONITO_PCIMAP_WINBASE(end) - 1;
                bonito64_controller.mem_offset = start -
                                                 BONITO_PCIMAP_WINBASE(map);

                controller = &bonito64_controller;
                break;

        case MIPS_REVISION_SCON_SOCIT:
        case MIPS_REVISION_SCON_ROCIT:
        case MIPS_REVISION_SCON_SOCITSC:
        case MIPS_REVISION_SCON_SOCITSCP:
                /* Set up resource ranges from the controller's registers.  */
                MSC_READ(MSC01_PCI_SC2PMBASL, start);
                MSC_READ(MSC01_PCI_SC2PMMSKL, mask);
                MSC_READ(MSC01_PCI_SC2PMMAPL, map);
                msc_mem_resource.start = start & mask;
                msc_mem_resource.end = (start & mask) | ~mask;
                msc_controller.mem_offset = (start & mask) - (map & mask);
                if (mips_cps_numiocu(0)) {
                        write_gcr_reg0_base(start);
                        write_gcr_reg0_mask(mask |
                                            CM_GCR_REGn_MASK_CMTGT_IOCU0);
                }
                MSC_READ(MSC01_PCI_SC2PIOBASL, start);
                MSC_READ(MSC01_PCI_SC2PIOMSKL, mask);
                MSC_READ(MSC01_PCI_SC2PIOMAPL, map);
                msc_io_resource.start = map & mask;
                msc_io_resource.end = (map & mask) | ~mask;
                msc_controller.io_offset = 0;
                ioport_resource.end = ~mask;
                if (mips_cps_numiocu(0)) {
                        write_gcr_reg1_base(start);
                        write_gcr_reg1_mask(mask |
                                            CM_GCR_REGn_MASK_CMTGT_IOCU0);
                }
                /* If ranges overlap I/O takes precedence.  */
                start = start & mask;
                end = start | ~mask;
                if ((start >= msc_mem_resource.start &&
                     start <= msc_mem_resource.end) ||
                    (end >= msc_mem_resource.start &&
                     end <= msc_mem_resource.end)) {
                        /* Use the larger space.  */
                        start = max(start, msc_mem_resource.start);
                        end = min(end, msc_mem_resource.end);
                        if (start - msc_mem_resource.start >=
                            msc_mem_resource.end - end)
                                msc_mem_resource.end = start - 1;
                        else
                                msc_mem_resource.start = end + 1;
                }

                controller = &msc_controller;
                break;
        default:
                return;
        }

        /* PIIX4 ACPI starts at 0x1000 */
        if (controller->io_resource->start < 0x00001000UL)
                controller->io_resource->start = 0x00001000UL;

        iomem_resource.end &= 0xfffffffffULL;                   /* 64 GB */
        ioport_resource.end = controller->io_resource->end;

        controller->io_map_base = mips_io_port_base;

        register_pci_controller(controller);
}