// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright (C) 1995  Linus Torvalds
 *  Adapted from 'alpha' version by Gary Thomas
 *  Modified by Cort Dougan (cort@cs.nmt.edu)
 */

/*
 * bootup setup stuff..
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/tty.h>
#include <linux/major.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <generated/utsrelease.h>
#include <linux/adb.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/console.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/initrd.h>
#include <linux/timer.h>
#include <linux/of_address.h>
#include <linux/of_fdt.h>
#include <linux/of_irq.h>

#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/dma.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/hydra.h>
#include <asm/sections.h>
#include <asm/time.h>
#include <asm/i8259.h>
#include <asm/mpic.h>
#include <asm/rtas.h>
#include <asm/xmon.h>

#include "chrp.h"
#include "gg2.h"

void rtas_indicator_progress(char *, unsigned short);

int _chrp_type;
EXPORT_SYMBOL(_chrp_type);

static struct mpic *chrp_mpic;

/* Used for doing CHRP event-scans */
DEFINE_PER_CPU(struct timer_list, heartbeat_timer);
unsigned long event_scan_interval;

extern unsigned long loops_per_jiffy;

/* To be replaced by RTAS when available */
static unsigned int __iomem *briq_SPOR;

#ifdef CONFIG_SMP
extern struct smp_ops_t chrp_smp_ops;
#endif

static const char *gg2_memtypes[4] = {
        "FPM", "SDRAM", "EDO", "BEDO"
};
static const char *gg2_cachesizes[4] = {
        "256 KB", "512 KB", "1 MB", "Reserved"
};
static const char *gg2_cachetypes[4] = {
        "Asynchronous", "Reserved", "Flow-Through Synchronous",
        "Pipelined Synchronous"
};
static const char *gg2_cachemodes[4] = {
        "Disabled", "Write-Through", "Copy-Back", "Transparent Mode"
};

static const char *chrp_names[] = {
        "Unknown",
        "","","",
        "Motorola",
        "IBM or Longtrail",
        "Genesi Pegasos",
        "Total Impact Briq"
};

static void chrp_show_cpuinfo(struct seq_file *m)
{
        int i, sdramen;
        unsigned int t;
        struct device_node *root;
        const char *model = "";

        root = of_find_node_by_path("/");
        if (root)
                model = of_get_property(root, "model", NULL);
        seq_printf(m, "machine\t\t: CHRP %s\n", model);

        /* longtrail (goldengate) stuff */
        if (model && !strncmp(model, "IBM,LongTrail", 13)) {
                /* VLSI VAS96011/12 `Golden Gate 2' */
                /* Memory banks */
                sdramen = (in_le32(gg2_pci_config_base + GG2_PCI_DRAM_CTRL)
                           >>31) & 1;
                for (i = 0; i < (sdramen ? 4 : 6); i++) {
                        t = in_le32(gg2_pci_config_base+
                                                 GG2_PCI_DRAM_BANK0+
                                                 i*4);
                        if (!(t & 1))
                                continue;
                        switch ((t>>8) & 0x1f) {
                        case 0x1f:
                                model = "4 MB";
                                break;
                        case 0x1e:
                                model = "8 MB";
                                break;
                        case 0x1c:
                                model = "16 MB";
                                break;
                        case 0x18:
                                model = "32 MB";
                                break;
                        case 0x10:
                                model = "64 MB";
                                break;
                        case 0x00:
                                model = "128 MB";
                                break;
                        default:
                                model = "Reserved";
                                break;
                        }
                        seq_printf(m, "memory bank %d\t: %s %s\n", i, model,
                                   gg2_memtypes[sdramen ? 1 : ((t>>1) & 3)]);
                }
                /* L2 cache */
                t = in_le32(gg2_pci_config_base+GG2_PCI_CC_CTRL);
                seq_printf(m, "board l2\t: %s %s (%s)\n",
                           gg2_cachesizes[(t>>7) & 3],
                           gg2_cachetypes[(t>>2) & 3],
                           gg2_cachemodes[t & 3]);
        }
        of_node_put(root);
}

/*
 *  Fixes for the National Semiconductor PC78308VUL SuperI/O
 *
 *  Some versions of Open Firmware incorrectly initialize the IRQ settings
 *  for keyboard and mouse
 */
static inline void __init sio_write(u8 val, u8 index)
{
        outb(index, 0x15c);
        outb(val, 0x15d);
}

static inline u8 __init sio_read(u8 index)
{
        outb(index, 0x15c);
        return inb(0x15d);
}

static void __init sio_fixup_irq(const char *name, u8 device, u8 level,
                                     u8 type)
{
        u8 level0, type0, active;

        /* select logical device */
        sio_write(device, 0x07);
        active = sio_read(0x30);
        level0 = sio_read(0x70);
        type0 = sio_read(0x71);
        if (level0 != level || type0 != type || !active) {
                printk(KERN_WARNING "sio: %s irq level %d, type %d, %sactive: "
                       "remapping to level %d, type %d, active\n",
                       name, level0, type0, !active ? "in" : "", level, type);
                sio_write(0x01, 0x30);
                sio_write(level, 0x70);
                sio_write(type, 0x71);
        }
}

static void __init sio_init(void)
{
        struct device_node *root;
        const char *model;

        root = of_find_node_by_path("/");
        if (!root)
                return;

        model = of_get_property(root, "model", NULL);
        if (model && !strncmp(model, "IBM,LongTrail", 13)) {
                /* logical device 0 (KBC/Keyboard) */
                sio_fixup_irq("keyboard", 0, 1, 2);
                /* select logical device 1 (KBC/Mouse) */
                sio_fixup_irq("mouse", 1, 12, 2);
        }

        of_node_put(root);
}


static void __init pegasos_set_l2cr(void)
{
        struct device_node *np;

        /* On Pegasos, enable the l2 cache if needed, as the OF forgets it */
        if (_chrp_type != _CHRP_Pegasos)
                return;

        /* Enable L2 cache if needed */
        np = of_find_node_by_type(NULL, "cpu");
        if (np != NULL) {
                const unsigned int *l2cr = of_get_property(np, "l2cr", NULL);
                if (l2cr == NULL) {
                        printk ("Pegasos l2cr : no cpu l2cr property found\n");
                        goto out;
                }
                if (!((*l2cr) & 0x80000000)) {
                        printk ("Pegasos l2cr : L2 cache was not active, "
                                "activating\n");
                        _set_L2CR(0);
                        _set_L2CR((*l2cr) | 0x80000000);
                }
        }
out:
        of_node_put(np);
}

static void __noreturn briq_restart(char *cmd)
{
        local_irq_disable();
        if (briq_SPOR)
                out_be32(briq_SPOR, 0);
        for(;;);
}

/*
 * Per default, input/output-device points to the keyboard/screen
 * If no card is installed, the built-in serial port is used as a fallback.
 * But unfortunately, the firmware does not connect /chosen/{stdin,stdout}
 * to the built-in serial node. Instead, a /failsafe node is created.
 */
static __init void chrp_init(void)
{
        struct device_node *node;
        const char *property;

        if (strstr(boot_command_line, "console="))
                return;
        /* find the boot console from /chosen/stdout */
        if (!of_chosen)
                return;
        node = of_find_node_by_path("/");
        if (!node)
                return;
        property = of_get_property(node, "model", NULL);
        if (!property)
                goto out_put;
        if (strcmp(property, "Pegasos2"))
                goto out_put;
        /* this is a Pegasos2 */
        property = of_get_property(of_chosen, "linux,stdout-path", NULL);
        if (!property)
                goto out_put;
        of_node_put(node);
        node = of_find_node_by_path(property);
        if (!node)
                return;
        if (!of_node_is_type(node, "serial"))
                goto out_put;
        /*
         * The 9pin connector is either /failsafe
         * or /pci@80000000/isa@C/serial@i2F8
         * The optional graphics card has also type 'serial' in VGA mode.
         */
        if (of_node_name_eq(node, "failsafe") || of_node_name_eq(node, "serial"))
                add_preferred_console("ttyS", 0, NULL);
out_put:
        of_node_put(node);
}

static void __init chrp_setup_arch(void)
{
        struct device_node *root = of_find_node_by_path("/");
        const char *machine = NULL;

        /* init to some ~sane value until calibrate_delay() runs */
        loops_per_jiffy = 50000000/HZ;

        if (root)
                machine = of_get_property(root, "model", NULL);
        if (machine && strncmp(machine, "Pegasos", 7) == 0) {
                _chrp_type = _CHRP_Pegasos;
        } else if (machine && strncmp(machine, "IBM", 3) == 0) {
                _chrp_type = _CHRP_IBM;
        } else if (machine && strncmp(machine, "MOT", 3) == 0) {
                _chrp_type = _CHRP_Motorola;
        } else if (machine && strncmp(machine, "TotalImpact,BRIQ-1", 18) == 0) {
                _chrp_type = _CHRP_briq;
                /* Map the SPOR register on briq and change the restart hook */
                briq_SPOR = ioremap(0xff0000e8, 4);
                ppc_md.restart = briq_restart;
        } else {
                /* Let's assume it is an IBM chrp if all else fails */
                _chrp_type = _CHRP_IBM;
        }
        of_node_put(root);
        printk("chrp type = %x [%s]\n", _chrp_type, chrp_names[_chrp_type]);

        rtas_initialize();
        if (rtas_function_token(RTAS_FN_DISPLAY_CHARACTER) >= 0)
                ppc_md.progress = rtas_progress;

        /* use RTAS time-of-day routines if available */
        if (rtas_function_token(RTAS_FN_GET_TIME_OF_DAY) != RTAS_UNKNOWN_SERVICE) {
                ppc_md.get_boot_time    = rtas_get_boot_time;
                ppc_md.get_rtc_time     = rtas_get_rtc_time;
                ppc_md.set_rtc_time     = rtas_set_rtc_time;
        }

        /* On pegasos, enable the L2 cache if not already done by OF */
        pegasos_set_l2cr();

        /*
         *  Fix the Super I/O configuration
         */
        sio_init();

        /*
         * Print the banner, then scroll down so boot progress
         * can be printed.  -- Cort
         */
        if (ppc_md.progress) ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0x0);
}

static void chrp_8259_cascade(struct irq_desc *desc)
{
        struct irq_chip *chip = irq_desc_get_chip(desc);
        unsigned int cascade_irq = i8259_irq();

        if (cascade_irq)
                generic_handle_irq(cascade_irq);

        chip->irq_eoi(&desc->irq_data);
}

/*
 * Finds the open-pic node and sets up the mpic driver.
 */
static void __init chrp_find_openpic(void)
{
        struct device_node *np, *root;
        int len, i, j;
        int isu_size;
        const unsigned int *iranges, *opprop = NULL;
        int oplen = 0;
        unsigned long opaddr;
        int na = 1;

        np = of_find_node_by_type(NULL, "open-pic");
        if (np == NULL)
                return;
        root = of_find_node_by_path("/");
        if (root) {
                opprop = of_get_property(root, "platform-open-pic", &oplen);
                na = of_n_addr_cells(root);
        }
        if (opprop && oplen >= na * sizeof(unsigned int)) {
                opaddr = opprop[na-1];  /* assume 32-bit */
                oplen /= na * sizeof(unsigned int);
        } else {
                struct resource r;
                if (of_address_to_resource(np, 0, &r)) {
                        goto bail;
                }
                opaddr = r.start;
                oplen = 0;
        }

        printk(KERN_INFO "OpenPIC at %lx\n", opaddr);

        iranges = of_get_property(np, "interrupt-ranges", &len);
        if (iranges == NULL)
                len = 0;        /* non-distributed mpic */
        else
                len /= 2 * sizeof(unsigned int);

        /*
         * The first pair of cells in interrupt-ranges refers to the
         * IDU; subsequent pairs refer to the ISUs.
         */
        if (oplen < len) {
                printk(KERN_ERR "Insufficient addresses for distributed"
                       " OpenPIC (%d < %d)\n", oplen, len);
                len = oplen;
        }

        isu_size = 0;
        if (len > 0 && iranges[1] != 0) {
                printk(KERN_INFO "OpenPIC irqs %d..%d in IDU\n",
                       iranges[0], iranges[0] + iranges[1] - 1);
        }
        if (len > 1)
                isu_size = iranges[3];

        chrp_mpic = mpic_alloc(np, opaddr, MPIC_NO_RESET,
                        isu_size, 0, " MPIC    ");
        if (chrp_mpic == NULL) {
                printk(KERN_ERR "Failed to allocate MPIC structure\n");
                goto bail;
        }
        j = na - 1;
        for (i = 1; i < len; ++i) {
                iranges += 2;
                j += na;
                printk(KERN_INFO "OpenPIC irqs %d..%d in ISU at %x\n",
                       iranges[0], iranges[0] + iranges[1] - 1,
                       opprop[j]);
                mpic_assign_isu(chrp_mpic, i - 1, opprop[j]);
        }

        mpic_init(chrp_mpic);
        ppc_md.get_irq = mpic_get_irq;
 bail:
        of_node_put(root);
        of_node_put(np);
}

static void __init chrp_find_8259(void)
{
        struct device_node *np, *pic = NULL;
        unsigned long chrp_int_ack = 0;
        unsigned int cascade_irq;

        /* Look for cascade */
        for_each_node_by_type(np, "interrupt-controller")
                if (of_device_is_compatible(np, "chrp,iic")) {
                        pic = np;
                        break;
                }
        /* Ok, 8259 wasn't found. We need to handle the case where
         * we have a pegasos that claims to be chrp but doesn't have
         * a proper interrupt tree
         */
        if (pic == NULL && chrp_mpic != NULL) {
                printk(KERN_ERR "i8259: Not found in device-tree"
                       " assuming no legacy interrupts\n");
                return;
        }

        /* Look for intack. In a perfect world, we would look for it on
         * the ISA bus that holds the 8259 but heh... Works that way. If
         * we ever see a problem, we can try to re-use the pSeries code here.
         * Also, Pegasos-type platforms don't have a proper node to start
         * from anyway
         */
        for_each_node_by_name(np, "pci") {
                const unsigned int *addrp = of_get_property(np,
                                "8259-interrupt-acknowledge", NULL);

                if (addrp == NULL)
                        continue;
                chrp_int_ack = addrp[of_n_addr_cells(np)-1];
                break;
        }
        of_node_put(np);
        if (np == NULL)
                printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
                       " address, polling\n");

        i8259_init(pic, chrp_int_ack);
        if (ppc_md.get_irq == NULL) {
                ppc_md.get_irq = i8259_irq;
                irq_set_default_domain(i8259_get_host());
        }
        if (chrp_mpic != NULL) {
                cascade_irq = irq_of_parse_and_map(pic, 0);
                if (!cascade_irq)
                        printk(KERN_ERR "i8259: failed to map cascade irq\n");
                else
                        irq_set_chained_handler(cascade_irq,
                                                chrp_8259_cascade);
        }
}

static void __init chrp_init_IRQ(void)
{
#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
        struct device_node *kbd;
#endif
        chrp_find_openpic();
        chrp_find_8259();

#ifdef CONFIG_SMP
        /* Pegasos has no MPIC, those ops would make it crash. It might be an
         * option to move setting them to after we probe the PIC though
         */
        if (chrp_mpic != NULL)
                smp_ops = &chrp_smp_ops;
#endif /* CONFIG_SMP */

        if (_chrp_type == _CHRP_Pegasos)
                ppc_md.get_irq        = i8259_irq;

#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
        /* see if there is a keyboard in the device tree
           with a parent of type "adb" */
        for_each_node_by_name(kbd, "keyboard")
                if (of_node_is_type(kbd->parent, "adb"))
                        break;
        of_node_put(kbd);
        if (kbd) {
                if (request_irq(HYDRA_INT_ADB_NMI, xmon_irq, 0, "XMON break",
                                NULL))
                        pr_err("Failed to register XMON break interrupt\n");
        }
#endif
}

static void __init
chrp_init2(void)
{
#if IS_ENABLED(CONFIG_NVRAM)
        chrp_nvram_init();
#endif

        request_region(0x20,0x20,"pic1");
        request_region(0xa0,0x20,"pic2");
        request_region(0x00,0x20,"dma1");
        request_region(0x40,0x20,"timer");
        request_region(0x80,0x10,"dma page reg");
        request_region(0xc0,0x20,"dma2");

        if (ppc_md.progress)
                ppc_md.progress("  Have fun!    ", 0x7777);
}

static int __init chrp_probe(void)
{
        const char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
                                                "device_type", NULL);
        if (dtype == NULL)
                return 0;
        if (strcmp(dtype, "chrp"))
                return 0;

        DMA_MODE_READ = 0x44;
        DMA_MODE_WRITE = 0x48;

        pm_power_off = rtas_power_off;

        chrp_init();

        return 1;
}

define_machine(chrp) {
        .name                   = "CHRP",
        .probe                  = chrp_probe,
        .setup_arch             = chrp_setup_arch,
        .discover_phbs          = chrp_find_bridges,
        .init                   = chrp_init2,
        .show_cpuinfo           = chrp_show_cpuinfo,
        .init_IRQ               = chrp_init_IRQ,
        .restart                = rtas_restart,
        .halt                   = rtas_halt,
        .time_init              = chrp_time_init,
        .set_rtc_time           = chrp_set_rtc_time,
        .get_rtc_time           = chrp_get_rtc_time,
        .phys_mem_access_prot   = pci_phys_mem_access_prot,
};