/*
 * Copyright 2008-2011 Freescale Semiconductor, Inc.
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <asm/processor.h>
#include <ioports.h>
#include <lmb.h>
#include <asm/io.h>
#include <asm/mmu.h>
#include <asm/fsl_law.h>
#include <fsl_ddr_sdram.h>
#include "mp.h"

DECLARE_GLOBAL_DATA_PTR;
u32 fsl_ddr_get_intl3r(void);

extern u32 __spin_table[];

u32 get_my_id()
{
        return mfspr(SPRN_PIR);
}

/*
 * Determine if U-Boot should keep secondary cores in reset, or let them out
 * of reset and hold them in a spinloop
 */
int hold_cores_in_reset(int verbose)
{
        /* Default to no, overridden by 'y', 'yes', 'Y', 'Yes', or '1' */
        if (env_get_yesno("mp_holdoff") == 1) {
                if (verbose) {
                        puts("Secondary cores are being held in reset.\n");
                        puts("See 'mp_holdoff' environment variable\n");
                }

                return 1;
        }

        return 0;
}

int cpu_reset(int nr)
{
        volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);
        out_be32(&pic->pir, 1 << nr);
        /* the dummy read works around an errata on early 85xx MP PICs */
        (void)in_be32(&pic->pir);
        out_be32(&pic->pir, 0x0);

        return 0;
}

int cpu_status(int nr)
{
        u32 *table, id = get_my_id();

        if (hold_cores_in_reset(1))
                return 0;

        if (nr == id) {
                table = (u32 *)&__spin_table;
                printf("table base @ 0x%p\n", table);
        } else if (is_core_disabled(nr)) {
                puts("Disabled\n");
        } else {
                table = (u32 *)&__spin_table + nr * NUM_BOOT_ENTRY;
                printf("Running on cpu %d\n", id);
                printf("\n");
                printf("table @ 0x%p\n", table);
                printf("   addr - 0x%08x\n", table[BOOT_ENTRY_ADDR_LOWER]);
                printf("   r3   - 0x%08x\n", table[BOOT_ENTRY_R3_LOWER]);
                printf("   pir  - 0x%08x\n", table[BOOT_ENTRY_PIR]);
        }

        return 0;
}

#ifdef CONFIG_FSL_CORENET
int cpu_disable(int nr)
{
        volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);

        setbits_be32(&gur->coredisrl, 1 << nr);

        return 0;
}

int is_core_disabled(int nr) {
        ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
        u32 coredisrl = in_be32(&gur->coredisrl);

        return (coredisrl & (1 << nr));
}
#else
int cpu_disable(int nr)
{
        volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);

        switch (nr) {
        case 0:
                setbits_be32(&gur->devdisr, MPC85xx_DEVDISR_CPU0);
                break;
        case 1:
                setbits_be32(&gur->devdisr, MPC85xx_DEVDISR_CPU1);
                break;
        default:
                printf("Invalid cpu number for disable %d\n", nr);
                return 1;
        }

        return 0;
}

int is_core_disabled(int nr) {
        ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
        u32 devdisr = in_be32(&gur->devdisr);

        switch (nr) {
        case 0:
                return (devdisr & MPC85xx_DEVDISR_CPU0);
        case 1:
                return (devdisr & MPC85xx_DEVDISR_CPU1);
        default:
                printf("Invalid cpu number for disable %d\n", nr);
        }

        return 0;
}
#endif

static u8 boot_entry_map[4] = {
        0,
        BOOT_ENTRY_PIR,
        BOOT_ENTRY_R3_LOWER,
};

int cpu_release(int nr, int argc, char * const argv[])
{
        u32 i, val, *table = (u32 *)&__spin_table + nr * NUM_BOOT_ENTRY;
        u64 boot_addr;

        if (hold_cores_in_reset(1))
                return 0;

        if (nr == get_my_id()) {
                printf("Invalid to release the boot core.\n\n");
                return 1;
        }

        if (argc != 4) {
                printf("Invalid number of arguments to release.\n\n");
                return 1;
        }

        boot_addr = simple_strtoull(argv[0], NULL, 16);

        /* handle pir, r3 */
        for (i = 1; i < 3; i++) {
                if (argv[i][0] != '-') {
                        u8 entry = boot_entry_map[i];
                        val = simple_strtoul(argv[i], NULL, 16);
                        table[entry] = val;
                }
        }

        table[BOOT_ENTRY_ADDR_UPPER] = (u32)(boot_addr >> 32);

        /* ensure all table updates complete before final address write */
        eieio();

        table[BOOT_ENTRY_ADDR_LOWER] = (u32)(boot_addr & 0xffffffff);

        return 0;
}

u32 determine_mp_bootpg(unsigned int *pagesize)
{
        u32 bootpg;
#ifdef CONFIG_SYS_FSL_ERRATUM_A004468
        u32 svr = get_svr();
        u32 granule_size, check;
        struct law_entry e;
#endif


        /* use last 4K of mapped memory */
        bootpg = ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ?
                CONFIG_MAX_MEM_MAPPED : gd->ram_size) +
                CONFIG_SYS_SDRAM_BASE - 4096;
        if (pagesize)
                *pagesize = 4096;

#ifdef CONFIG_SYS_FSL_ERRATUM_A004468
/*
 * Erratum A004468 has two parts. The 3-way interleaving applies to T4240,
 * to be fixed in rev 2.0. The 2-way interleaving applies to many SoCs. But
 * the way boot page chosen in u-boot avoids hitting this erratum. So only
 * thw workaround for 3-way interleaving is needed.
 *
 * To make sure boot page translation works with 3-Way DDR interleaving
 * enforce a check for the following constrains
 * 8K granule size requires BRSIZE=8K and
 *    bootpg >> log2(BRSIZE) %3 == 1
 * 4K and 1K granule size requires BRSIZE=4K and
 *    bootpg >> log2(BRSIZE) %3 == 0
 */
        if (SVR_SOC_VER(svr) == SVR_T4240 && SVR_MAJ(svr) < 2) {
                e = find_law(bootpg);
                switch (e.trgt_id) {
                case LAW_TRGT_IF_DDR_INTLV_123:
                        granule_size = fsl_ddr_get_intl3r() & 0x1f;
                        if (granule_size == FSL_DDR_3WAY_8KB_INTERLEAVING) {
                                if (pagesize)
                                        *pagesize = 8192;
                                bootpg &= 0xffffe000;   /* align to 8KB */
                                check = bootpg >> 13;
                                while ((check % 3) != 1)
                                        check--;
                                bootpg = check << 13;
                                debug("Boot page (8K) at 0x%08x\n", bootpg);
                                break;
                        } else {
                                bootpg &= 0xfffff000;   /* align to 4KB */
                                check = bootpg >> 12;
                                while ((check % 3) != 0)
                                        check--;
                                bootpg = check << 12;
                                debug("Boot page (4K) at 0x%08x\n", bootpg);
                        }
                                break;
                default:
                        break;
                }
        }
#endif /* CONFIG_SYS_FSL_ERRATUM_A004468 */

        return bootpg;
}

phys_addr_t get_spin_phys_addr(void)
{
        return virt_to_phys(&__spin_table);
}

#ifdef CONFIG_FSL_CORENET
static void plat_mp_up(unsigned long bootpg, unsigned int pagesize)
{
        u32 cpu_up_mask, whoami, brsize = LAW_SIZE_4K;
        u32 *table = (u32 *)&__spin_table;
        volatile ccsr_gur_t *gur;
        volatile ccsr_local_t *ccm;
        volatile ccsr_rcpm_t *rcpm;
        volatile ccsr_pic_t *pic;
        int timeout = 10;
        u32 mask = cpu_mask();
        struct law_entry e;

        gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
        ccm = (void *)(CONFIG_SYS_FSL_CORENET_CCM_ADDR);
        rcpm = (void *)(CONFIG_SYS_FSL_CORENET_RCPM_ADDR);
        pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);

        whoami = in_be32(&pic->whoami);
        cpu_up_mask = 1 << whoami;
        out_be32(&ccm->bstrl, bootpg);

        e = find_law(bootpg);
        /* pagesize is only 4K or 8K */
        if (pagesize == 8192)
                brsize = LAW_SIZE_8K;
        out_be32(&ccm->bstrar, LAW_EN | e.trgt_id << 20 | brsize);
        debug("BRSIZE is 0x%x\n", brsize);

        /* readback to sync write */
        in_be32(&ccm->bstrar);

        /* disable time base at the platform */
        out_be32(&rcpm->ctbenrl, cpu_up_mask);

        out_be32(&gur->brrl, mask);

        /* wait for everyone */
        while (timeout) {
                unsigned int i, cpu, nr_cpus = cpu_numcores();

                for_each_cpu(i, cpu, nr_cpus, mask) {
                        if (table[cpu * NUM_BOOT_ENTRY + BOOT_ENTRY_ADDR_LOWER])
                                cpu_up_mask |= (1 << cpu);
                }

                if ((cpu_up_mask & mask) == mask)
                        break;

                udelay(100);
                timeout--;
        }

        if (timeout == 0)
                printf("CPU up timeout. CPU up mask is %x should be %x\n",
                        cpu_up_mask, mask);

        /* enable time base at the platform */
        out_be32(&rcpm->ctbenrl, 0);

        /* readback to sync write */
        in_be32(&rcpm->ctbenrl);

        mtspr(SPRN_TBWU, 0);
        mtspr(SPRN_TBWL, 0);

        out_be32(&rcpm->ctbenrl, mask);

#ifdef CONFIG_MPC8xxx_DISABLE_BPTR
        /*
         * Disabling Boot Page Translation allows the memory region 0xfffff000
         * to 0xffffffff to be used normally.  Leaving Boot Page Translation
         * enabled remaps 0xfffff000 to SDRAM which makes that memory region
         * unusable for normal operation but it does allow OSes to easily
         * reset a processor core to put it back into U-Boot's spinloop.
         */
        clrbits_be32(&ccm->bstrar, LAW_EN);
#endif
}
#else
static void plat_mp_up(unsigned long bootpg, unsigned int pagesize)
{
        u32 up, cpu_up_mask, whoami;
        u32 *table = (u32 *)&__spin_table;
        volatile u32 bpcr;
        volatile ccsr_local_ecm_t *ecm = (void *)(CONFIG_SYS_MPC85xx_ECM_ADDR);
        volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
        volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);
        u32 devdisr;
        int timeout = 10;

        whoami = in_be32(&pic->whoami);
        out_be32(&ecm->bptr, 0x80000000 | (bootpg >> 12));

        /* disable time base at the platform */
        devdisr = in_be32(&gur->devdisr);
        if (whoami)
                devdisr |= MPC85xx_DEVDISR_TB0;
        else
                devdisr |= MPC85xx_DEVDISR_TB1;
        out_be32(&gur->devdisr, devdisr);

        /* release the hounds */
        up = ((1 << cpu_numcores()) - 1);
        bpcr = in_be32(&ecm->eebpcr);
        bpcr |= (up << 24);
        out_be32(&ecm->eebpcr, bpcr);
        asm("sync; isync; msync");

        cpu_up_mask = 1 << whoami;
        /* wait for everyone */
        while (timeout) {
                int i;
                for (i = 0; i < cpu_numcores(); i++) {
                        if (table[i * NUM_BOOT_ENTRY + BOOT_ENTRY_ADDR_LOWER])
                                cpu_up_mask |= (1 << i);
                };

                if ((cpu_up_mask & up) == up)
                        break;

                udelay(100);
                timeout--;
        }

        if (timeout == 0)
                printf("CPU up timeout. CPU up mask is %x should be %x\n",
                        cpu_up_mask, up);

        /* enable time base at the platform */
        if (whoami)
                devdisr |= MPC85xx_DEVDISR_TB1;
        else
                devdisr |= MPC85xx_DEVDISR_TB0;
        out_be32(&gur->devdisr, devdisr);

        /* readback to sync write */
        in_be32(&gur->devdisr);

        mtspr(SPRN_TBWU, 0);
        mtspr(SPRN_TBWL, 0);

        devdisr &= ~(MPC85xx_DEVDISR_TB0 | MPC85xx_DEVDISR_TB1);
        out_be32(&gur->devdisr, devdisr);

#ifdef CONFIG_MPC8xxx_DISABLE_BPTR
        /*
         * Disabling Boot Page Translation allows the memory region 0xfffff000
         * to 0xffffffff to be used normally.  Leaving Boot Page Translation
         * enabled remaps 0xfffff000 to SDRAM which makes that memory region
         * unusable for normal operation but it does allow OSes to easily
         * reset a processor core to put it back into U-Boot's spinloop.
         */
        clrbits_be32(&ecm->bptr, 0x80000000);
#endif
}
#endif

void cpu_mp_lmb_reserve(struct lmb *lmb)
{
        u32 bootpg = determine_mp_bootpg(NULL);

        lmb_reserve(lmb, bootpg, 4096);
}

void setup_mp(void)
{
        extern u32 __secondary_start_page;
        extern u32 __bootpg_addr, __spin_table_addr, __second_half_boot_page;

        int i;
        ulong fixup = (u32)&__secondary_start_page;
        u32 bootpg, bootpg_map, pagesize;

        bootpg = determine_mp_bootpg(&pagesize);

        /*
         * pagesize is only 4K or 8K
         * we only use the last 4K of boot page
         * bootpg_map saves the address for the boot page
         * 8K is used for the workaround of 3-way DDR interleaving
         */

        bootpg_map = bootpg;

        if (pagesize == 8192)
                bootpg += 4096; /* use 2nd half */

        /* Some OSes expect secondary cores to be held in reset */
        if (hold_cores_in_reset(0))
                return;

        /*
         * Store the bootpg's cache-able half address for use by secondary
         * CPU cores to continue to boot
         */
        __bootpg_addr = (u32)virt_to_phys(&__second_half_boot_page);

        /* Store spin table's physical address for use by secondary cores */
        __spin_table_addr = (u32)get_spin_phys_addr();

        /* flush bootpg it before copying invalidate any staled cacheline */
        flush_cache(bootpg, 4096);

        /* look for the tlb covering the reset page, there better be one */
        i = find_tlb_idx((void *)CONFIG_BPTR_VIRT_ADDR, 1);

        /* we found a match */
        if (i != -1) {
                /* map reset page to bootpg so we can copy code there */
                disable_tlb(i);

                set_tlb(1, CONFIG_BPTR_VIRT_ADDR, bootpg, /* tlb, epn, rpn */
                        MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G, /* perms, wimge */
                        0, i, BOOKE_PAGESZ_4K, 1); /* ts, esel, tsize, iprot */

                memcpy((void *)CONFIG_BPTR_VIRT_ADDR, (void *)fixup, 4096);

                plat_mp_up(bootpg_map, pagesize);
        } else {
                puts("WARNING: No reset page TLB. "
                        "Skipping secondary core setup\n");
        }
}