// SPDX-License-Identifier: GPL-2.0
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/dma-mapping.h>
#include <asm/leon.h>
#include <asm/leon_amba.h>

#include "of_device_common.h"
#include "irq.h"

/*
 * PCI bus specific translator
 */

static int of_bus_pci_match(struct device_node *np)
{
        if (of_node_is_type(np, "pci") || of_node_is_type(np, "pciex")) {
                /* Do not do PCI specific frobbing if the
                 * PCI bridge lacks a ranges property.  We
                 * want to pass it through up to the next
                 * parent as-is, not with the PCI translate
                 * method which chops off the top address cell.
                 */
                if (!of_find_property(np, "ranges", NULL))
                        return 0;

                return 1;
        }

        return 0;
}

static void of_bus_pci_count_cells(struct device_node *np,
                                   int *addrc, int *sizec)
{
        if (addrc)
                *addrc = 3;
        if (sizec)
                *sizec = 2;
}

static int of_bus_pci_map(u32 *addr, const u32 *range,
                          int na, int ns, int pna)
{
        u32 result[OF_MAX_ADDR_CELLS];
        int i;

        /* Check address type match */
        if ((addr[0] ^ range[0]) & 0x03000000)
                return -EINVAL;

        if (of_out_of_range(addr + 1, range + 1, range + na + pna,
                            na - 1, ns))
                return -EINVAL;

        /* Start with the parent range base.  */
        memcpy(result, range + na, pna * 4);

        /* Add in the child address offset, skipping high cell.  */
        for (i = 0; i < na - 1; i++)
                result[pna - 1 - i] +=
                        (addr[na - 1 - i] -
                         range[na - 1 - i]);

        memcpy(addr, result, pna * 4);

        return 0;
}

static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
{
        u32 w = addr[0];

        /* For PCI, we override whatever child busses may have used.  */
        flags = 0;
        switch((w >> 24) & 0x03) {
        case 0x01:
                flags |= IORESOURCE_IO;
                break;

        case 0x02: /* 32 bits */
        case 0x03: /* 64 bits */
                flags |= IORESOURCE_MEM;
                break;
        }
        if (w & 0x40000000)
                flags |= IORESOURCE_PREFETCH;
        return flags;
}

static unsigned long of_bus_sbus_get_flags(const u32 *addr, unsigned long flags)
{
        return IORESOURCE_MEM;
}

 /*
 * AMBAPP bus specific translator
 */

static int of_bus_ambapp_match(struct device_node *np)
{
        return of_node_is_type(np, "ambapp");
}

static void of_bus_ambapp_count_cells(struct device_node *child,
                                      int *addrc, int *sizec)
{
        if (addrc)
                *addrc = 1;
        if (sizec)
                *sizec = 1;
}

static int of_bus_ambapp_map(u32 *addr, const u32 *range,
                             int na, int ns, int pna)
{
        return of_bus_default_map(addr, range, na, ns, pna);
}

static unsigned long of_bus_ambapp_get_flags(const u32 *addr,
                                             unsigned long flags)
{
        return IORESOURCE_MEM;
}

/*
 * Array of bus specific translators
 */

static struct of_bus of_busses[] = {
        /* PCI */
        {
                .name = "pci",
                .addr_prop_name = "assigned-addresses",
                .match = of_bus_pci_match,
                .count_cells = of_bus_pci_count_cells,
                .map = of_bus_pci_map,
                .get_flags = of_bus_pci_get_flags,
        },
        /* SBUS */
        {
                .name = "sbus",
                .addr_prop_name = "reg",
                .match = of_bus_sbus_match,
                .count_cells = of_bus_sbus_count_cells,
                .map = of_bus_default_map,
                .get_flags = of_bus_sbus_get_flags,
        },
        /* AMBA */
        {
                .name = "ambapp",
                .addr_prop_name = "reg",
                .match = of_bus_ambapp_match,
                .count_cells = of_bus_ambapp_count_cells,
                .map = of_bus_ambapp_map,
                .get_flags = of_bus_ambapp_get_flags,
        },
        /* Default */
        {
                .name = "default",
                .addr_prop_name = "reg",
                .match = NULL,
                .count_cells = of_bus_default_count_cells,
                .map = of_bus_default_map,
                .get_flags = of_bus_default_get_flags,
        },
};

static struct of_bus *of_match_bus(struct device_node *np)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
                if (!of_busses[i].match || of_busses[i].match(np))
                        return &of_busses[i];
        BUG();
        return NULL;
}

static int __init build_one_resource(struct device_node *parent,
                                     struct of_bus *bus,
                                     struct of_bus *pbus,
                                     u32 *addr,
                                     int na, int ns, int pna)
{
        const u32 *ranges;
        unsigned int rlen;
        int rone;

        ranges = of_get_property(parent, "ranges", &rlen);
        if (ranges == NULL || rlen == 0) {
                u32 result[OF_MAX_ADDR_CELLS];
                int i;

                memset(result, 0, pna * 4);
                for (i = 0; i < na; i++)
                        result[pna - 1 - i] =
                                addr[na - 1 - i];

                memcpy(addr, result, pna * 4);
                return 0;
        }

        /* Now walk through the ranges */
        rlen /= 4;
        rone = na + pna + ns;
        for (; rlen >= rone; rlen -= rone, ranges += rone) {
                if (!bus->map(addr, ranges, na, ns, pna))
                        return 0;
        }

        return 1;
}

static int __init use_1to1_mapping(struct device_node *pp)
{
        /* If we have a ranges property in the parent, use it.  */
        if (of_find_property(pp, "ranges", NULL) != NULL)
                return 0;

        /* Some SBUS devices use intermediate nodes to express
         * hierarchy within the device itself.  These aren't
         * real bus nodes, and don't have a 'ranges' property.
         * But, we should still pass the translation work up
         * to the SBUS itself.
         */
        if (of_node_name_eq(pp, "dma") ||
            of_node_name_eq(pp, "espdma") ||
            of_node_name_eq(pp, "ledma") ||
            of_node_name_eq(pp, "lebuffer"))
                return 0;

        return 1;
}

static int of_resource_verbose;

static void __init build_device_resources(struct platform_device *op,
                                          struct device *parent)
{
        struct platform_device *p_op;
        struct of_bus *bus;
        int na, ns;
        int index, num_reg;
        const void *preg;

        if (!parent)
                return;

        p_op = to_platform_device(parent);
        bus = of_match_bus(p_op->dev.of_node);
        bus->count_cells(op->dev.of_node, &na, &ns);

        preg = of_get_property(op->dev.of_node, bus->addr_prop_name, &num_reg);
        if (!preg || num_reg == 0)
                return;

        /* Convert to num-cells.  */
        num_reg /= 4;

        /* Conver to num-entries.  */
        num_reg /= na + ns;

        op->resource = op->archdata.resource;
        op->num_resources = num_reg;
        for (index = 0; index < num_reg; index++) {
                struct resource *r = &op->resource[index];
                u32 addr[OF_MAX_ADDR_CELLS];
                const u32 *reg = (preg + (index * ((na + ns) * 4)));
                struct device_node *dp = op->dev.of_node;
                struct device_node *pp = p_op->dev.of_node;
                struct of_bus *pbus, *dbus;
                u64 size, result = OF_BAD_ADDR;
                unsigned long flags;
                int dna, dns;
                int pna, pns;

                size = of_read_addr(reg + na, ns);

                memcpy(addr, reg, na * 4);

                flags = bus->get_flags(reg, 0);

                if (use_1to1_mapping(pp)) {
                        result = of_read_addr(addr, na);
                        goto build_res;
                }

                dna = na;
                dns = ns;
                dbus = bus;

                while (1) {
                        dp = pp;
                        pp = dp->parent;
                        if (!pp) {
                                result = of_read_addr(addr, dna);
                                break;
                        }

                        pbus = of_match_bus(pp);
                        pbus->count_cells(dp, &pna, &pns);

                        if (build_one_resource(dp, dbus, pbus, addr,
                                               dna, dns, pna))
                                break;

                        flags = pbus->get_flags(addr, flags);

                        dna = pna;
                        dns = pns;
                        dbus = pbus;
                }

        build_res:
                memset(r, 0, sizeof(*r));

                if (of_resource_verbose)
                        printk("%pOF reg[%d] -> %llx\n",
                               op->dev.of_node, index,
                               result);

                if (result != OF_BAD_ADDR) {
                        r->start = result & 0xffffffff;
                        r->end = result + size - 1;
                        r->flags = flags | ((result >> 32ULL) & 0xffUL);
                }
                r->name = op->dev.of_node->full_name;
        }
}

static struct platform_device * __init scan_one_device(struct device_node *dp,
                                                 struct device *parent)
{
        struct platform_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
        const struct linux_prom_irqs *intr;
        struct dev_archdata *sd;
        int len, i;

        if (!op)
                return NULL;

        sd = &op->dev.archdata;
        sd->op = op;

        op->dev.of_node = dp;

        intr = of_get_property(dp, "intr", &len);
        if (intr) {
                op->archdata.num_irqs = len / sizeof(struct linux_prom_irqs);
                for (i = 0; i < op->archdata.num_irqs; i++)
                        op->archdata.irqs[i] =
                            sparc_config.build_device_irq(op, intr[i].pri);
        } else {
                const unsigned int *irq =
                        of_get_property(dp, "interrupts", &len);

                if (irq) {
                        op->archdata.num_irqs = len / sizeof(unsigned int);
                        for (i = 0; i < op->archdata.num_irqs; i++)
                                op->archdata.irqs[i] =
                                    sparc_config.build_device_irq(op, irq[i]);
                } else {
                        op->archdata.num_irqs = 0;
                }
        }

        build_device_resources(op, parent);

        op->dev.parent = parent;
        op->dev.bus = &platform_bus_type;
        if (!parent)
                dev_set_name(&op->dev, "root");
        else
                dev_set_name(&op->dev, "%08x", dp->phandle);

        op->dev.coherent_dma_mask = DMA_BIT_MASK(32);
        op->dev.dma_mask = &op->dev.coherent_dma_mask;

        if (of_device_register(op)) {
                printk("%pOF: Could not register of device.\n", dp);
                kfree(op);
                op = NULL;
        }

        return op;
}

static void __init scan_tree(struct device_node *dp, struct device *parent)
{
        while (dp) {
                struct platform_device *op = scan_one_device(dp, parent);

                if (op)
                        scan_tree(dp->child, &op->dev);

                dp = dp->sibling;
        }
}

static int __init scan_of_devices(void)
{
        struct device_node *root = of_find_node_by_path("/");
        struct platform_device *parent;

        parent = scan_one_device(root, NULL);
        if (!parent)
                return 0;

        scan_tree(root->child, &parent->dev);
        return 0;
}
postcore_initcall(scan_of_devices);

static int __init of_debug(char *str)
{
        int val = 0;

        get_option(&str, &val);
        if (val & 1)
                of_resource_verbose = 1;
        return 1;
}

__setup("of_debug=", of_debug);