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[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / arch / mips / cavium-octeon / executive / cvmx-l2c.c

/***********************license start***************
 * Author: Cavium Networks
 *
 * Contact: support@caviumnetworks.com
 * This file is part of the OCTEON SDK
 *
 * Copyright (c) 2003-2008 Cavium Networks
 *
 * This file is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, Version 2, as
 * published by the Free Software Foundation.
 *
 * This file is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this file; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 * or visit http://www.gnu.org/licenses/.
 *
 * This file may also be available under a different license from Cavium.
 * Contact Cavium Networks for more information
 ***********************license end**************************************/

/*
 * Implementation of the Level 2 Cache (L2C) control, measurement, and
 * debugging facilities.
 */

#include <asm/octeon/cvmx.h>
#include <asm/octeon/cvmx-l2c.h>
#include <asm/octeon/cvmx-spinlock.h>

/*
 * This spinlock is used internally to ensure that only one core is
 * performing certain L2 operations at a time.
 *
 * NOTE: This only protects calls from within a single application -
 * if multiple applications or operating systems are running, then it
 * is up to the user program to coordinate between them.
 */
static cvmx_spinlock_t cvmx_l2c_spinlock;

static inline int l2_size_half(void)
{
        uint64_t val = cvmx_read_csr(CVMX_L2D_FUS3);
        return !!(val & (1ull << 34));
}

int cvmx_l2c_get_core_way_partition(uint32_t core)
{
        uint32_t field;

        /* Validate the core number */
        if (core >= cvmx_octeon_num_cores())
                return -1;

        /*
         * Use the lower two bits of the coreNumber to determine the
         * bit offset of the UMSK[] field in the L2C_SPAR register.
         */
        field = (core & 0x3) * 8;

        /*
         * Return the UMSK[] field from the appropriate L2C_SPAR
         * register based on the coreNumber.
         */

        switch (core & 0xC) {
        case 0x0:
                return (cvmx_read_csr(CVMX_L2C_SPAR0) & (0xFF << field)) >>
                        field;
        case 0x4:
                return (cvmx_read_csr(CVMX_L2C_SPAR1) & (0xFF << field)) >>
                        field;
        case 0x8:
                return (cvmx_read_csr(CVMX_L2C_SPAR2) & (0xFF << field)) >>
                        field;
        case 0xC:
                return (cvmx_read_csr(CVMX_L2C_SPAR3) & (0xFF << field)) >>
                        field;
        }
        return 0;
}

int cvmx_l2c_set_core_way_partition(uint32_t core, uint32_t mask)
{
        uint32_t field;
        uint32_t valid_mask;

        valid_mask = (0x1 << cvmx_l2c_get_num_assoc()) - 1;

        mask &= valid_mask;

        /* A UMSK setting which blocks all L2C Ways is an error. */
        if (mask == valid_mask)
                return -1;

        /* Validate the core number */
        if (core >= cvmx_octeon_num_cores())
                return -1;

        /* Check to make sure current mask & new mask don't block all ways */
        if (((mask | cvmx_l2c_get_core_way_partition(core)) & valid_mask) ==
            valid_mask)
                return -1;

        /* Use the lower two bits of core to determine the bit offset of the
         * UMSK[] field in the L2C_SPAR register.
         */
        field = (core & 0x3) * 8;

        /* Assign the new mask setting to the UMSK[] field in the appropriate
         * L2C_SPAR register based on the core_num.
         *
         */
        switch (core & 0xC) {
        case 0x0:
                cvmx_write_csr(CVMX_L2C_SPAR0,
                               (cvmx_read_csr(CVMX_L2C_SPAR0) &
                                ~(0xFF << field)) | mask << field);
                break;
        case 0x4:
                cvmx_write_csr(CVMX_L2C_SPAR1,
                               (cvmx_read_csr(CVMX_L2C_SPAR1) &
                                ~(0xFF << field)) | mask << field);
                break;
        case 0x8:
                cvmx_write_csr(CVMX_L2C_SPAR2,
                               (cvmx_read_csr(CVMX_L2C_SPAR2) &
                                ~(0xFF << field)) | mask << field);
                break;
        case 0xC:
                cvmx_write_csr(CVMX_L2C_SPAR3,
                               (cvmx_read_csr(CVMX_L2C_SPAR3) &
                                ~(0xFF << field)) | mask << field);
                break;
        }
        return 0;
}

int cvmx_l2c_set_hw_way_partition(uint32_t mask)
{
        uint32_t valid_mask;

        valid_mask = 0xff;

        if (OCTEON_IS_MODEL(OCTEON_CN58XX) || OCTEON_IS_MODEL(OCTEON_CN38XX)) {
                if (l2_size_half())
                        valid_mask = 0xf;
        } else if (l2_size_half())
                valid_mask = 0x3;

        mask &= valid_mask;

        /* A UMSK setting which blocks all L2C Ways is an error. */
        if (mask == valid_mask)
                return -1;
        /* Check to make sure current mask & new mask don't block all ways */
        if (((mask | cvmx_l2c_get_hw_way_partition()) & valid_mask) ==
            valid_mask)
                return -1;

        cvmx_write_csr(CVMX_L2C_SPAR4,
                       (cvmx_read_csr(CVMX_L2C_SPAR4) & ~0xFF) | mask);
        return 0;
}

int cvmx_l2c_get_hw_way_partition(void)
{
        return cvmx_read_csr(CVMX_L2C_SPAR4) & (0xFF);
}

void cvmx_l2c_config_perf(uint32_t counter, enum cvmx_l2c_event event,
                          uint32_t clear_on_read)
{
        union cvmx_l2c_pfctl pfctl;

        pfctl.u64 = cvmx_read_csr(CVMX_L2C_PFCTL);

        switch (counter) {
        case 0:
                pfctl.s.cnt0sel = event;
                pfctl.s.cnt0ena = 1;
                if (!cvmx_octeon_is_pass1())
                        pfctl.s.cnt0rdclr = clear_on_read;
                break;
        case 1:
                pfctl.s.cnt1sel = event;
                pfctl.s.cnt1ena = 1;
                if (!cvmx_octeon_is_pass1())
                        pfctl.s.cnt1rdclr = clear_on_read;
                break;
        case 2:
                pfctl.s.cnt2sel = event;
                pfctl.s.cnt2ena = 1;
                if (!cvmx_octeon_is_pass1())
                        pfctl.s.cnt2rdclr = clear_on_read;
                break;
        case 3:
        default:
                pfctl.s.cnt3sel = event;
                pfctl.s.cnt3ena = 1;
                if (!cvmx_octeon_is_pass1())
                        pfctl.s.cnt3rdclr = clear_on_read;
                break;
        }

        cvmx_write_csr(CVMX_L2C_PFCTL, pfctl.u64);
}

uint64_t cvmx_l2c_read_perf(uint32_t counter)
{
        switch (counter) {
        case 0:
                return cvmx_read_csr(CVMX_L2C_PFC0);
        case 1:
                return cvmx_read_csr(CVMX_L2C_PFC1);
        case 2:
                return cvmx_read_csr(CVMX_L2C_PFC2);
        case 3:
        default:
                return cvmx_read_csr(CVMX_L2C_PFC3);
        }
}

/**
 * @INTERNAL
 * Helper function use to fault in cache lines for L2 cache locking
 *
 * @addr:   Address of base of memory region to read into L2 cache
 * @len:    Length (in bytes) of region to fault in
 */
static void fault_in(uint64_t addr, int len)
{
        volatile char *ptr;
        volatile char dummy;
        /*
         * Adjust addr and length so we get all cache lines even for
         * small ranges spanning two cache lines
         */
        len += addr & CVMX_CACHE_LINE_MASK;
        addr &= ~CVMX_CACHE_LINE_MASK;
        ptr = (volatile char *)cvmx_phys_to_ptr(addr);
        /*
         * Invalidate L1 cache to make sure all loads result in data
         * being in L2.
         */
        CVMX_DCACHE_INVALIDATE;
        while (len > 0) {
                dummy += *ptr;
                len -= CVMX_CACHE_LINE_SIZE;
                ptr += CVMX_CACHE_LINE_SIZE;
        }
}

int cvmx_l2c_lock_line(uint64_t addr)
{
        int retval = 0;
        union cvmx_l2c_dbg l2cdbg;
        union cvmx_l2c_lckbase lckbase;
        union cvmx_l2c_lckoff lckoff;
        union cvmx_l2t_err l2t_err;
        l2cdbg.u64 = 0;
        lckbase.u64 = 0;
        lckoff.u64 = 0;

        cvmx_spinlock_lock(&cvmx_l2c_spinlock);

        /* Clear l2t error bits if set */
        l2t_err.u64 = cvmx_read_csr(CVMX_L2T_ERR);
        l2t_err.s.lckerr = 1;
        l2t_err.s.lckerr2 = 1;
        cvmx_write_csr(CVMX_L2T_ERR, l2t_err.u64);

        addr &= ~CVMX_CACHE_LINE_MASK;

        /* Set this core as debug core */
        l2cdbg.s.ppnum = cvmx_get_core_num();
        CVMX_SYNC;
        cvmx_write_csr(CVMX_L2C_DBG, l2cdbg.u64);
        cvmx_read_csr(CVMX_L2C_DBG);

        lckoff.s.lck_offset = 0;        /* Only lock 1 line at a time */
        cvmx_write_csr(CVMX_L2C_LCKOFF, lckoff.u64);
        cvmx_read_csr(CVMX_L2C_LCKOFF);

        if (((union cvmx_l2c_cfg) (cvmx_read_csr(CVMX_L2C_CFG))).s.idxalias) {
                int alias_shift =
                    CVMX_L2C_IDX_ADDR_SHIFT + 2 * CVMX_L2_SET_BITS - 1;
                uint64_t addr_tmp =
                    addr ^ (addr & ((1 << alias_shift) - 1)) >>
                    CVMX_L2_SET_BITS;
                lckbase.s.lck_base = addr_tmp >> 7;
        } else {
                lckbase.s.lck_base = addr >> 7;
        }

        lckbase.s.lck_ena = 1;
        cvmx_write_csr(CVMX_L2C_LCKBASE, lckbase.u64);
        cvmx_read_csr(CVMX_L2C_LCKBASE);        /* Make sure it gets there */

        fault_in(addr, CVMX_CACHE_LINE_SIZE);

        lckbase.s.lck_ena = 0;
        cvmx_write_csr(CVMX_L2C_LCKBASE, lckbase.u64);
        cvmx_read_csr(CVMX_L2C_LCKBASE);        /* Make sure it gets there */

        /* Stop being debug core */
        cvmx_write_csr(CVMX_L2C_DBG, 0);
        cvmx_read_csr(CVMX_L2C_DBG);

        l2t_err.u64 = cvmx_read_csr(CVMX_L2T_ERR);
        if (l2t_err.s.lckerr || l2t_err.s.lckerr2)
                retval = 1;     /* We were unable to lock the line */

        cvmx_spinlock_unlock(&cvmx_l2c_spinlock);

        return retval;
}

int cvmx_l2c_lock_mem_region(uint64_t start, uint64_t len)
{
        int retval = 0;

        /* Round start/end to cache line boundaries */
        len += start & CVMX_CACHE_LINE_MASK;
        start &= ~CVMX_CACHE_LINE_MASK;
        len = (len + CVMX_CACHE_LINE_MASK) & ~CVMX_CACHE_LINE_MASK;

        while (len) {
                retval += cvmx_l2c_lock_line(start);
                start += CVMX_CACHE_LINE_SIZE;
                len -= CVMX_CACHE_LINE_SIZE;
        }

        return retval;
}

void cvmx_l2c_flush(void)
{
        uint64_t assoc, set;
        uint64_t n_assoc, n_set;
        union cvmx_l2c_dbg l2cdbg;

        cvmx_spinlock_lock(&cvmx_l2c_spinlock);

        l2cdbg.u64 = 0;
        if (!OCTEON_IS_MODEL(OCTEON_CN30XX))
                l2cdbg.s.ppnum = cvmx_get_core_num();
        l2cdbg.s.finv = 1;
        n_set = CVMX_L2_SETS;
        n_assoc = l2_size_half() ? (CVMX_L2_ASSOC / 2) : CVMX_L2_ASSOC;
        for (set = 0; set < n_set; set++) {
                for (assoc = 0; assoc < n_assoc; assoc++) {
                        l2cdbg.s.set = assoc;
                        /* Enter debug mode, and make sure all other
                         ** writes complete before we enter debug
                         ** mode */
                        CVMX_SYNCW;
                        cvmx_write_csr(CVMX_L2C_DBG, l2cdbg.u64);
                        cvmx_read_csr(CVMX_L2C_DBG);

                        CVMX_PREPARE_FOR_STORE(CVMX_ADD_SEG
                                               (CVMX_MIPS_SPACE_XKPHYS,
                                                set * CVMX_CACHE_LINE_SIZE), 0);
                        CVMX_SYNCW;     /* Push STF out to L2 */
                        /* Exit debug mode */
                        CVMX_SYNC;
                        cvmx_write_csr(CVMX_L2C_DBG, 0);
                        cvmx_read_csr(CVMX_L2C_DBG);
                }
        }

        cvmx_spinlock_unlock(&cvmx_l2c_spinlock);
}

int cvmx_l2c_unlock_line(uint64_t address)
{
        int assoc;
        union cvmx_l2c_tag tag;
        union cvmx_l2c_dbg l2cdbg;
        uint32_t tag_addr;

        uint32_t index = cvmx_l2c_address_to_index(address);

        cvmx_spinlock_lock(&cvmx_l2c_spinlock);
        /* Compute portion of address that is stored in tag */
        tag_addr =
            ((address >> CVMX_L2C_TAG_ADDR_ALIAS_SHIFT) &
             ((1 << CVMX_L2C_TAG_ADDR_ALIAS_SHIFT) - 1));
        for (assoc = 0; assoc < CVMX_L2_ASSOC; assoc++) {
                tag = cvmx_get_l2c_tag(assoc, index);

                if (tag.s.V && (tag.s.addr == tag_addr)) {
                        l2cdbg.u64 = 0;
                        l2cdbg.s.ppnum = cvmx_get_core_num();
                        l2cdbg.s.set = assoc;
                        l2cdbg.s.finv = 1;

                        CVMX_SYNC;
                        /* Enter debug mode */
                        cvmx_write_csr(CVMX_L2C_DBG, l2cdbg.u64);
                        cvmx_read_csr(CVMX_L2C_DBG);

                        CVMX_PREPARE_FOR_STORE(CVMX_ADD_SEG
                                               (CVMX_MIPS_SPACE_XKPHYS,
                                                address), 0);
                        CVMX_SYNC;
                        /* Exit debug mode */
                        cvmx_write_csr(CVMX_L2C_DBG, 0);
                        cvmx_read_csr(CVMX_L2C_DBG);
                        cvmx_spinlock_unlock(&cvmx_l2c_spinlock);
                        return tag.s.L;
                }
        }
        cvmx_spinlock_unlock(&cvmx_l2c_spinlock);
        return 0;
}

int cvmx_l2c_unlock_mem_region(uint64_t start, uint64_t len)
{
        int num_unlocked = 0;
        /* Round start/end to cache line boundaries */
        len += start & CVMX_CACHE_LINE_MASK;
        start &= ~CVMX_CACHE_LINE_MASK;
        len = (len + CVMX_CACHE_LINE_MASK) & ~CVMX_CACHE_LINE_MASK;
        while (len > 0) {
                num_unlocked += cvmx_l2c_unlock_line(start);
                start += CVMX_CACHE_LINE_SIZE;
                len -= CVMX_CACHE_LINE_SIZE;
        }

        return num_unlocked;
}

/*
 * Internal l2c tag types.  These are converted to a generic structure
 * that can be used on all chips.
 */
union __cvmx_l2c_tag {
        uint64_t u64;
        struct cvmx_l2c_tag_cn50xx {
                uint64_t reserved:40;
                uint64_t V:1;   /* Line valid */
                uint64_t D:1;   /* Line dirty */
                uint64_t L:1;   /* Line locked */
                uint64_t U:1;   /* Use, LRU eviction */
                uint64_t addr:20;       /* Phys mem addr (33..14) */
        } cn50xx;
        struct cvmx_l2c_tag_cn30xx {
                uint64_t reserved:41;
                uint64_t V:1;   /* Line valid */
                uint64_t D:1;   /* Line dirty */
                uint64_t L:1;   /* Line locked */
                uint64_t U:1;   /* Use, LRU eviction */
                uint64_t addr:19;       /* Phys mem addr (33..15) */
        } cn30xx;
        struct cvmx_l2c_tag_cn31xx {
                uint64_t reserved:42;
                uint64_t V:1;   /* Line valid */
                uint64_t D:1;   /* Line dirty */
                uint64_t L:1;   /* Line locked */
                uint64_t U:1;   /* Use, LRU eviction */
                uint64_t addr:18;       /* Phys mem addr (33..16) */
        } cn31xx;
        struct cvmx_l2c_tag_cn38xx {
                uint64_t reserved:43;
                uint64_t V:1;   /* Line valid */
                uint64_t D:1;   /* Line dirty */
                uint64_t L:1;   /* Line locked */
                uint64_t U:1;   /* Use, LRU eviction */
                uint64_t addr:17;       /* Phys mem addr (33..17) */
        } cn38xx;
        struct cvmx_l2c_tag_cn58xx {
                uint64_t reserved:44;
                uint64_t V:1;   /* Line valid */
                uint64_t D:1;   /* Line dirty */
                uint64_t L:1;   /* Line locked */
                uint64_t U:1;   /* Use, LRU eviction */
                uint64_t addr:16;       /* Phys mem addr (33..18) */
        } cn58xx;
        struct cvmx_l2c_tag_cn58xx cn56xx;      /* 2048 sets */
        struct cvmx_l2c_tag_cn31xx cn52xx;      /* 512 sets */
};

/**
 * @INTERNAL
 * Function to read a L2C tag.  This code make the current core
 * the 'debug core' for the L2.  This code must only be executed by
 * 1 core at a time.
 *
 * @assoc:  Association (way) of the tag to dump
 * @index:  Index of the cacheline
 *
 * Returns The Octeon model specific tag structure.  This is
 *         translated by a wrapper function to a generic form that is
 *         easier for applications to use.
 */
static union __cvmx_l2c_tag __read_l2_tag(uint64_t assoc, uint64_t index)
{

        uint64_t debug_tag_addr = (((1ULL << 63) | (index << 7)) + 96);
        uint64_t core = cvmx_get_core_num();
        union __cvmx_l2c_tag tag_val;
        uint64_t dbg_addr = CVMX_L2C_DBG;
        unsigned long flags;

        union cvmx_l2c_dbg debug_val;
        debug_val.u64 = 0;
        /*
         * For low core count parts, the core number is always small enough
         * to stay in the correct field and not set any reserved bits.
         */
        debug_val.s.ppnum = core;
        debug_val.s.l2t = 1;
        debug_val.s.set = assoc;
        /*
         * Make sure core is quiet (no prefetches, etc.) before
         * entering debug mode.
         */
        CVMX_SYNC;
        /* Flush L1 to make sure debug load misses L1 */
        CVMX_DCACHE_INVALIDATE;

        local_irq_save(flags);

        /*
         * The following must be done in assembly as when in debug
         * mode all data loads from L2 return special debug data, not
         * normal memory contents.  Also, interrupts must be
         * disabled, since if an interrupt occurs while in debug mode
         * the ISR will get debug data from all its memory reads
         * instead of the contents of memory
         */

        asm volatile (".set push              \n"
                "        .set mips64              \n"
                "        .set noreorder           \n"
                /* Enter debug mode, wait for store */
                "        sd    %[dbg_val], 0(%[dbg_addr])  \n"
                "        ld    $0, 0(%[dbg_addr]) \n"
                /* Read L2C tag data */
                "        ld    %[tag_val], 0(%[tag_addr]) \n"
                /* Exit debug mode, wait for store */
                "        sd    $0, 0(%[dbg_addr])  \n"
                "        ld    $0, 0(%[dbg_addr]) \n"
                /* Invalidate dcache to discard debug data */
                "        cache 9, 0($0) \n"
                "        .set pop" :
                [tag_val] "=r"(tag_val.u64) : [dbg_addr] "r"(dbg_addr),
                [dbg_val] "r"(debug_val.u64),
                [tag_addr] "r"(debug_tag_addr) : "memory");

        local_irq_restore(flags);
        return tag_val;

}

union cvmx_l2c_tag cvmx_l2c_get_tag(uint32_t association, uint32_t index)
{
        union __cvmx_l2c_tag tmp_tag;
        union cvmx_l2c_tag tag;
        tag.u64 = 0;

        if ((int)association >= cvmx_l2c_get_num_assoc()) {
                cvmx_dprintf
                    ("ERROR: cvmx_get_l2c_tag association out of range\n");
                return tag;
        }
        if ((int)index >= cvmx_l2c_get_num_sets()) {
                cvmx_dprintf("ERROR: cvmx_get_l2c_tag "
                             "index out of range (arg: %d, max: %d\n",
                     index, cvmx_l2c_get_num_sets());
                return tag;
        }
        /* __read_l2_tag is intended for internal use only */
        tmp_tag = __read_l2_tag(association, index);

        /*
         * Convert all tag structure types to generic version, as it
         * can represent all models.
         */
        if (OCTEON_IS_MODEL(OCTEON_CN58XX) || OCTEON_IS_MODEL(OCTEON_CN56XX)) {
                tag.s.V = tmp_tag.cn58xx.V;
                tag.s.D = tmp_tag.cn58xx.D;
                tag.s.L = tmp_tag.cn58xx.L;
                tag.s.U = tmp_tag.cn58xx.U;
                tag.s.addr = tmp_tag.cn58xx.addr;
        } else if (OCTEON_IS_MODEL(OCTEON_CN38XX)) {
                tag.s.V = tmp_tag.cn38xx.V;
                tag.s.D = tmp_tag.cn38xx.D;
                tag.s.L = tmp_tag.cn38xx.L;
                tag.s.U = tmp_tag.cn38xx.U;
                tag.s.addr = tmp_tag.cn38xx.addr;
        } else if (OCTEON_IS_MODEL(OCTEON_CN31XX)
                   || OCTEON_IS_MODEL(OCTEON_CN52XX)) {
                tag.s.V = tmp_tag.cn31xx.V;
                tag.s.D = tmp_tag.cn31xx.D;
                tag.s.L = tmp_tag.cn31xx.L;
                tag.s.U = tmp_tag.cn31xx.U;
                tag.s.addr = tmp_tag.cn31xx.addr;
        } else if (OCTEON_IS_MODEL(OCTEON_CN30XX)) {
                tag.s.V = tmp_tag.cn30xx.V;
                tag.s.D = tmp_tag.cn30xx.D;
                tag.s.L = tmp_tag.cn30xx.L;
                tag.s.U = tmp_tag.cn30xx.U;
                tag.s.addr = tmp_tag.cn30xx.addr;
        } else if (OCTEON_IS_MODEL(OCTEON_CN50XX)) {
                tag.s.V = tmp_tag.cn50xx.V;
                tag.s.D = tmp_tag.cn50xx.D;
                tag.s.L = tmp_tag.cn50xx.L;
                tag.s.U = tmp_tag.cn50xx.U;
                tag.s.addr = tmp_tag.cn50xx.addr;
        } else {
                cvmx_dprintf("Unsupported OCTEON Model in %s\n", __func__);
        }

        return tag;
}

uint32_t cvmx_l2c_address_to_index(uint64_t addr)
{
        uint64_t idx = addr >> CVMX_L2C_IDX_ADDR_SHIFT;
        union cvmx_l2c_cfg l2c_cfg;
        l2c_cfg.u64 = cvmx_read_csr(CVMX_L2C_CFG);

        if (l2c_cfg.s.idxalias) {
                idx ^=
                    ((addr & CVMX_L2C_ALIAS_MASK) >>
                     CVMX_L2C_TAG_ADDR_ALIAS_SHIFT);
        }
        idx &= CVMX_L2C_IDX_MASK;
        return idx;
}

int cvmx_l2c_get_cache_size_bytes(void)
{
        return cvmx_l2c_get_num_sets() * cvmx_l2c_get_num_assoc() *
                CVMX_CACHE_LINE_SIZE;
}

/**
 * Return log base 2 of the number of sets in the L2 cache
 * Returns
 */
int cvmx_l2c_get_set_bits(void)
{
        int l2_set_bits;
        if (OCTEON_IS_MODEL(OCTEON_CN56XX) || OCTEON_IS_MODEL(OCTEON_CN58XX))
                l2_set_bits = 11;       /* 2048 sets */
        else if (OCTEON_IS_MODEL(OCTEON_CN38XX))
                l2_set_bits = 10;       /* 1024 sets */
        else if (OCTEON_IS_MODEL(OCTEON_CN31XX)
                 || OCTEON_IS_MODEL(OCTEON_CN52XX))
                l2_set_bits = 9;        /* 512 sets */
        else if (OCTEON_IS_MODEL(OCTEON_CN30XX))
                l2_set_bits = 8;        /* 256 sets */
        else if (OCTEON_IS_MODEL(OCTEON_CN50XX))
                l2_set_bits = 7;        /* 128 sets */
        else {
                cvmx_dprintf("Unsupported OCTEON Model in %s\n", __func__);
                l2_set_bits = 11;       /* 2048 sets */
        }
        return l2_set_bits;

}

/* Return the number of sets in the L2 Cache */
int cvmx_l2c_get_num_sets(void)
{
        return 1 << cvmx_l2c_get_set_bits();
}

/* Return the number of associations in the L2 Cache */
int cvmx_l2c_get_num_assoc(void)
{
        int l2_assoc;
        if (OCTEON_IS_MODEL(OCTEON_CN56XX) ||
            OCTEON_IS_MODEL(OCTEON_CN52XX) ||
            OCTEON_IS_MODEL(OCTEON_CN58XX) ||
            OCTEON_IS_MODEL(OCTEON_CN50XX) || OCTEON_IS_MODEL(OCTEON_CN38XX))
                l2_assoc = 8;
        else if (OCTEON_IS_MODEL(OCTEON_CN31XX) ||
                 OCTEON_IS_MODEL(OCTEON_CN30XX))
                l2_assoc = 4;
        else {
                cvmx_dprintf("Unsupported OCTEON Model in %s\n", __func__);
                l2_assoc = 8;
        }

        /* Check to see if part of the cache is disabled */
        if (cvmx_fuse_read(265))
                l2_assoc = l2_assoc >> 2;
        else if (cvmx_fuse_read(264))
                l2_assoc = l2_assoc >> 1;

        return l2_assoc;
}

/**
 * Flush a line from the L2 cache
 * This should only be called from one core at a time, as this routine
 * sets the core to the 'debug' core in order to flush the line.
 *
 * @assoc:  Association (or way) to flush
 * @index:  Index to flush
 */
void cvmx_l2c_flush_line(uint32_t assoc, uint32_t index)
{
        union cvmx_l2c_dbg l2cdbg;

        l2cdbg.u64 = 0;
        l2cdbg.s.ppnum = cvmx_get_core_num();
        l2cdbg.s.finv = 1;

        l2cdbg.s.set = assoc;
        /*
         * Enter debug mode, and make sure all other writes complete
         * before we enter debug mode.
         */
        asm volatile ("sync" : : : "memory");
        cvmx_write_csr(CVMX_L2C_DBG, l2cdbg.u64);
        cvmx_read_csr(CVMX_L2C_DBG);

        CVMX_PREPARE_FOR_STORE(((1ULL << 63) + (index) * 128), 0);
        /* Exit debug mode */
        asm volatile ("sync" : : : "memory");
        cvmx_write_csr(CVMX_L2C_DBG, 0);
        cvmx_read_csr(CVMX_L2C_DBG);
}