satip-axe/kernel/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);
}