drivers/net/cxgb3/mc5.c - kernel/skids - Git at Google

 /*
  * Copyright (c) 2003-2008 Chelsio, Inc. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * OpenIB.org BSD license below:
  *
  *     Redistribution and use in source and binary forms, with or
  *     without modification, are permitted provided that the following
  *     conditions are met:
  *
  *      - Redistributions of source code must retain the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer.
  *
  *      - Redistributions in binary form must reproduce the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer in the documentation and/or other materials
  *        provided with the distribution.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
 #include "common.h"
 #include "regs.h"

 enum {
 	IDT75P52100 = 4,
 	IDT75N43102 = 5
 };

 /* DBGI command mode */
 enum {
 	DBGI_MODE_MBUS = 0,
 	DBGI_MODE_IDT52100 = 5
 };

 /* IDT 75P52100 commands */
 #define IDT_CMD_READ   0
 #define IDT_CMD_WRITE  1
 #define IDT_CMD_SEARCH 2
 #define IDT_CMD_LEARN  3

 /* IDT LAR register address and value for 144-bit mode (low 32 bits) */
 #define IDT_LAR_ADR0   	0x180006
 #define IDT_LAR_MODE144	0xffff0000

 /* IDT SCR and SSR addresses (low 32 bits) */
 #define IDT_SCR_ADR0  0x180000
 #define IDT_SSR0_ADR0 0x180002
 #define IDT_SSR1_ADR0 0x180004

 /* IDT GMR base address (low 32 bits) */
 #define IDT_GMR_BASE_ADR0 0x180020

 /* IDT data and mask array base addresses (low 32 bits) */
 #define IDT_DATARY_BASE_ADR0 0
 #define IDT_MSKARY_BASE_ADR0 0x80000

 /* IDT 75N43102 commands */
 #define IDT4_CMD_SEARCH144 3
 #define IDT4_CMD_WRITE     4
 #define IDT4_CMD_READ      5

 /* IDT 75N43102 SCR address (low 32 bits) */
 #define IDT4_SCR_ADR0  0x3

 /* IDT 75N43102 GMR base addresses (low 32 bits) */
 #define IDT4_GMR_BASE0 0x10
 #define IDT4_GMR_BASE1 0x20
 #define IDT4_GMR_BASE2 0x30

 /* IDT 75N43102 data and mask array base addresses (low 32 bits) */
 #define IDT4_DATARY_BASE_ADR0 0x1000000
 #define IDT4_MSKARY_BASE_ADR0 0x2000000

 #define MAX_WRITE_ATTEMPTS 5

 #define MAX_ROUTES 2048

 /*
  * Issue a command to the TCAM and wait for its completion.  The address and
  * any data required by the command must have been setup by the caller.
  */
 static int mc5_cmd_write(struct adapter *adapter, u32 cmd)
 {
 	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_CMD, cmd);
 	return t3_wait_op_done(adapter, A_MC5_DB_DBGI_RSP_STATUS,
 			       F_DBGIRSPVALID, 1, MAX_WRITE_ATTEMPTS, 1);
 }

 static inline void dbgi_wr_addr3(struct adapter *adapter, u32 v1, u32 v2,
 				 u32 v3)
 {
 	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_ADDR0, v1);
 	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_ADDR1, v2);
 	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_ADDR2, v3);
 }

 static inline void dbgi_wr_data3(struct adapter *adapter, u32 v1, u32 v2,
 				 u32 v3)
 {
 	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_DATA0, v1);
 	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_DATA1, v2);
 	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_DATA2, v3);
 }

 static inline void dbgi_rd_rsp3(struct adapter *adapter, u32 *v1, u32 *v2,
 				u32 *v3)
 {
 	*v1 = t3_read_reg(adapter, A_MC5_DB_DBGI_RSP_DATA0);
 	*v2 = t3_read_reg(adapter, A_MC5_DB_DBGI_RSP_DATA1);
 	*v3 = t3_read_reg(adapter, A_MC5_DB_DBGI_RSP_DATA2);
 }

 /*
  * Write data to the TCAM register at address (0, 0, addr_lo) using the TCAM
  * command cmd.  The data to be written must have been set up by the caller.
  * Returns -1 on failure, 0 on success.
  */
 static int mc5_write(struct adapter *adapter, u32 addr_lo, u32 cmd)
 {
 	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_ADDR0, addr_lo);
 	if (mc5_cmd_write(adapter, cmd) == 0)
 		return 0;
 	CH_ERR(adapter, "MC5 timeout writing to TCAM address 0x%x\n",
 	       addr_lo);
 	return -1;
 }

 static int init_mask_data_array(struct mc5 *mc5, u32 mask_array_base,
 				u32 data_array_base, u32 write_cmd,
 				int addr_shift)
 {
 	unsigned int i;
 	struct adapter *adap = mc5->adapter;

 	/*
 	 * We need the size of the TCAM data and mask arrays in terms of
 	 * 72-bit entries.
 	 */
 	unsigned int size72 = mc5->tcam_size;
 	unsigned int server_base = t3_read_reg(adap, A_MC5_DB_SERVER_INDEX);

 	if (mc5->mode == MC5_MODE_144_BIT) {
 		size72 *= 2;	/* 1 144-bit entry is 2 72-bit entries */
 		server_base *= 2;
 	}

 	/* Clear the data array */
 	dbgi_wr_data3(adap, 0, 0, 0);
 	for (i = 0; i < size72; i++)
 		if (mc5_write(adap, data_array_base + (i << addr_shift),
 			      write_cmd))
 			return -1;

 	/* Initialize the mask array. */
 	dbgi_wr_data3(adap, 0xffffffff, 0xffffffff, 0xff);
 	for (i = 0; i < size72; i++) {
 		if (i == server_base)	/* entering server or routing region */
 			t3_write_reg(adap, A_MC5_DB_DBGI_REQ_DATA0,
 				     mc5->mode == MC5_MODE_144_BIT ?
 				     0xfffffff9 : 0xfffffffd);
 		if (mc5_write(adap, mask_array_base + (i << addr_shift),
 			      write_cmd))
 			return -1;
 	}
 	return 0;
 }

 static int init_idt52100(struct mc5 *mc5)
 {
 	int i;
 	struct adapter *adap = mc5->adapter;

 	t3_write_reg(adap, A_MC5_DB_RSP_LATENCY,
 		     V_RDLAT(0x15) | V_LRNLAT(0x15) | V_SRCHLAT(0x15));
 	t3_write_reg(adap, A_MC5_DB_PART_ID_INDEX, 2);

 	/*
 	 * Use GMRs 14-15 for ELOOKUP, GMRs 12-13 for SYN lookups, and
 	 * GMRs 8-9 for ACK- and AOPEN searches.
 	 */
 	t3_write_reg(adap, A_MC5_DB_POPEN_DATA_WR_CMD, IDT_CMD_WRITE);
 	t3_write_reg(adap, A_MC5_DB_POPEN_MASK_WR_CMD, IDT_CMD_WRITE);
 	t3_write_reg(adap, A_MC5_DB_AOPEN_SRCH_CMD, IDT_CMD_SEARCH);
 	t3_write_reg(adap, A_MC5_DB_AOPEN_LRN_CMD, IDT_CMD_LEARN);
 	t3_write_reg(adap, A_MC5_DB_SYN_SRCH_CMD, IDT_CMD_SEARCH | 0x6000);
 	t3_write_reg(adap, A_MC5_DB_SYN_LRN_CMD, IDT_CMD_LEARN);
 	t3_write_reg(adap, A_MC5_DB_ACK_SRCH_CMD, IDT_CMD_SEARCH);
 	t3_write_reg(adap, A_MC5_DB_ACK_LRN_CMD, IDT_CMD_LEARN);
 	t3_write_reg(adap, A_MC5_DB_ILOOKUP_CMD, IDT_CMD_SEARCH);
 	t3_write_reg(adap, A_MC5_DB_ELOOKUP_CMD, IDT_CMD_SEARCH | 0x7000);
 	t3_write_reg(adap, A_MC5_DB_DATA_WRITE_CMD, IDT_CMD_WRITE);
 	t3_write_reg(adap, A_MC5_DB_DATA_READ_CMD, IDT_CMD_READ);

 	/* Set DBGI command mode for IDT TCAM. */
 	t3_write_reg(adap, A_MC5_DB_DBGI_CONFIG, DBGI_MODE_IDT52100);

 	/* Set up LAR */
 	dbgi_wr_data3(adap, IDT_LAR_MODE144, 0, 0);
 	if (mc5_write(adap, IDT_LAR_ADR0, IDT_CMD_WRITE))
 		goto err;

 	/* Set up SSRs */
 	dbgi_wr_data3(adap, 0xffffffff, 0xffffffff, 0);
 	if (mc5_write(adap, IDT_SSR0_ADR0, IDT_CMD_WRITE) ||
 	    mc5_write(adap, IDT_SSR1_ADR0, IDT_CMD_WRITE))
 		goto err;

 	/* Set up GMRs */
 	for (i = 0; i < 32; ++i) {
 		if (i >= 12 && i < 15)
 			dbgi_wr_data3(adap, 0xfffffff9, 0xffffffff, 0xff);
 		else if (i == 15)
 			dbgi_wr_data3(adap, 0xfffffff9, 0xffff8007, 0xff);
 		else
 			dbgi_wr_data3(adap, 0xffffffff, 0xffffffff, 0xff);

 		if (mc5_write(adap, IDT_GMR_BASE_ADR0 + i, IDT_CMD_WRITE))
 			goto err;
 	}

 	/* Set up SCR */
 	dbgi_wr_data3(adap, 1, 0, 0);
 	if (mc5_write(adap, IDT_SCR_ADR0, IDT_CMD_WRITE))
 		goto err;

 	return init_mask_data_array(mc5, IDT_MSKARY_BASE_ADR0,
 				    IDT_DATARY_BASE_ADR0, IDT_CMD_WRITE, 0);
 err:
 	return -EIO;
 }

 static int init_idt43102(struct mc5 *mc5)
 {
 	int i;
 	struct adapter *adap = mc5->adapter;

 	t3_write_reg(adap, A_MC5_DB_RSP_LATENCY,
 		     adap->params.rev == 0 ? V_RDLAT(0xd) | V_SRCHLAT(0x11) :
 		     V_RDLAT(0xd) | V_SRCHLAT(0x12));

 	/*
 	 * Use GMRs 24-25 for ELOOKUP, GMRs 20-21 for SYN lookups, and no mask
 	 * for ACK- and AOPEN searches.
 	 */
 	t3_write_reg(adap, A_MC5_DB_POPEN_DATA_WR_CMD, IDT4_CMD_WRITE);
 	t3_write_reg(adap, A_MC5_DB_POPEN_MASK_WR_CMD, IDT4_CMD_WRITE);
 	t3_write_reg(adap, A_MC5_DB_AOPEN_SRCH_CMD,
 		     IDT4_CMD_SEARCH144 | 0x3800);
 	t3_write_reg(adap, A_MC5_DB_SYN_SRCH_CMD, IDT4_CMD_SEARCH144);
 	t3_write_reg(adap, A_MC5_DB_ACK_SRCH_CMD, IDT4_CMD_SEARCH144 | 0x3800);
 	t3_write_reg(adap, A_MC5_DB_ILOOKUP_CMD, IDT4_CMD_SEARCH144 | 0x3800);
 	t3_write_reg(adap, A_MC5_DB_ELOOKUP_CMD, IDT4_CMD_SEARCH144 | 0x800);
 	t3_write_reg(adap, A_MC5_DB_DATA_WRITE_CMD, IDT4_CMD_WRITE);
 	t3_write_reg(adap, A_MC5_DB_DATA_READ_CMD, IDT4_CMD_READ);

 	t3_write_reg(adap, A_MC5_DB_PART_ID_INDEX, 3);

 	/* Set DBGI command mode for IDT TCAM. */
 	t3_write_reg(adap, A_MC5_DB_DBGI_CONFIG, DBGI_MODE_IDT52100);

 	/* Set up GMRs */
 	dbgi_wr_data3(adap, 0xffffffff, 0xffffffff, 0xff);
 	for (i = 0; i < 7; ++i)
 		if (mc5_write(adap, IDT4_GMR_BASE0 + i, IDT4_CMD_WRITE))
 			goto err;

 	for (i = 0; i < 4; ++i)
 		if (mc5_write(adap, IDT4_GMR_BASE2 + i, IDT4_CMD_WRITE))
 			goto err;

 	dbgi_wr_data3(adap, 0xfffffff9, 0xffffffff, 0xff);
 	if (mc5_write(adap, IDT4_GMR_BASE1, IDT4_CMD_WRITE) ||
 	    mc5_write(adap, IDT4_GMR_BASE1 + 1, IDT4_CMD_WRITE) ||
 	    mc5_write(adap, IDT4_GMR_BASE1 + 4, IDT4_CMD_WRITE))
 		goto err;

 	dbgi_wr_data3(adap, 0xfffffff9, 0xffff8007, 0xff);
 	if (mc5_write(adap, IDT4_GMR_BASE1 + 5, IDT4_CMD_WRITE))
 		goto err;

 	/* Set up SCR */
 	dbgi_wr_data3(adap, 0xf0000000, 0, 0);
 	if (mc5_write(adap, IDT4_SCR_ADR0, IDT4_CMD_WRITE))
 		goto err;

 	return init_mask_data_array(mc5, IDT4_MSKARY_BASE_ADR0,
 				    IDT4_DATARY_BASE_ADR0, IDT4_CMD_WRITE, 1);
 err:
 	return -EIO;
 }

 /* Put MC5 in DBGI mode. */
 static inline void mc5_dbgi_mode_enable(const struct mc5 *mc5)
 {
 	t3_write_reg(mc5->adapter, A_MC5_DB_CONFIG,
 		     V_TMMODE(mc5->mode == MC5_MODE_72_BIT) | F_DBGIEN);
 }

 /* Put MC5 in M-Bus mode. */
 static void mc5_dbgi_mode_disable(const struct mc5 *mc5)
 {
 	t3_write_reg(mc5->adapter, A_MC5_DB_CONFIG,
 		     V_TMMODE(mc5->mode == MC5_MODE_72_BIT) |
 		     V_COMPEN(mc5->mode == MC5_MODE_72_BIT) |
 		     V_PRTYEN(mc5->parity_enabled) | F_MBUSEN);
 }

 /*
  * Initialization that requires the OS and protocol layers to already
  * be intialized goes here.
  */
 int t3_mc5_init(struct mc5 *mc5, unsigned int nservers, unsigned int nfilters,
 		unsigned int nroutes)
 {
 	u32 cfg;
 	int err;
 	unsigned int tcam_size = mc5->tcam_size;
 	struct adapter *adap = mc5->adapter;

 	if (!tcam_size)
 		return 0;

 	if (nroutes > MAX_ROUTES || nroutes + nservers + nfilters > tcam_size)
 		return -EINVAL;

 	/* Reset the TCAM */
 	cfg = t3_read_reg(adap, A_MC5_DB_CONFIG) & ~F_TMMODE;
 	cfg |= V_TMMODE(mc5->mode == MC5_MODE_72_BIT) | F_TMRST;
 	t3_write_reg(adap, A_MC5_DB_CONFIG, cfg);
 	if (t3_wait_op_done(adap, A_MC5_DB_CONFIG, F_TMRDY, 1, 500, 0)) {
 		CH_ERR(adap, "TCAM reset timed out\n");
 		return -1;
 	}

 	t3_write_reg(adap, A_MC5_DB_ROUTING_TABLE_INDEX, tcam_size - nroutes);
 	t3_write_reg(adap, A_MC5_DB_FILTER_TABLE,
 		     tcam_size - nroutes - nfilters);
 	t3_write_reg(adap, A_MC5_DB_SERVER_INDEX,
 		     tcam_size - nroutes - nfilters - nservers);

 	mc5->parity_enabled = 1;

 	/* All the TCAM addresses we access have only the low 32 bits non 0 */
 	t3_write_reg(adap, A_MC5_DB_DBGI_REQ_ADDR1, 0);
 	t3_write_reg(adap, A_MC5_DB_DBGI_REQ_ADDR2, 0);

 	mc5_dbgi_mode_enable(mc5);

 	switch (mc5->part_type) {
 	case IDT75P52100:
 		err = init_idt52100(mc5);
 		break;
 	case IDT75N43102:
 		err = init_idt43102(mc5);
 		break;
 	default:
 		CH_ERR(adap, "Unsupported TCAM type %d\n", mc5->part_type);
 		err = -EINVAL;
 		break;
 	}

 	mc5_dbgi_mode_disable(mc5);
 	return err;
 }

 /*
  *	read_mc5_range - dump a part of the memory managed by MC5
  *	@mc5: the MC5 handle
  *	@start: the start address for the dump
  *	@n: number of 72-bit words to read
  *	@buf: result buffer
  *
  *	Read n 72-bit words from MC5 memory from the given start location.
  */
 int t3_read_mc5_range(const struct mc5 *mc5, unsigned int start,
 		      unsigned int n, u32 *buf)
 {
 	u32 read_cmd;
 	int err = 0;
 	struct adapter *adap = mc5->adapter;

 	if (mc5->part_type == IDT75P52100)
 		read_cmd = IDT_CMD_READ;
 	else if (mc5->part_type == IDT75N43102)
 		read_cmd = IDT4_CMD_READ;
 	else
 		return -EINVAL;

 	mc5_dbgi_mode_enable(mc5);

 	while (n--) {
 		t3_write_reg(adap, A_MC5_DB_DBGI_REQ_ADDR0, start++);
 		if (mc5_cmd_write(adap, read_cmd)) {
 			err = -EIO;
 			break;
 		}
 		dbgi_rd_rsp3(adap, buf + 2, buf + 1, buf);
 		buf += 3;
 	}

 	mc5_dbgi_mode_disable(mc5);
 	return 0;
 }

 #define MC5_INT_FATAL (F_PARITYERR | F_REQQPARERR | F_DISPQPARERR)

 /*
  * MC5 interrupt handler
  */
 void t3_mc5_intr_handler(struct mc5 *mc5)
 {
 	struct adapter *adap = mc5->adapter;
 	u32 cause = t3_read_reg(adap, A_MC5_DB_INT_CAUSE);

 	if ((cause & F_PARITYERR) && mc5->parity_enabled) {
 		CH_ALERT(adap, "MC5 parity error\n");
 		mc5->stats.parity_err++;
 	}

 	if (cause & F_REQQPARERR) {
 		CH_ALERT(adap, "MC5 request queue parity error\n");
 		mc5->stats.reqq_parity_err++;
 	}

 	if (cause & F_DISPQPARERR) {
 		CH_ALERT(adap, "MC5 dispatch queue parity error\n");
 		mc5->stats.dispq_parity_err++;
 	}

 	if (cause & F_ACTRGNFULL)
 		mc5->stats.active_rgn_full++;
 	if (cause & F_NFASRCHFAIL)
 		mc5->stats.nfa_srch_err++;
 	if (cause & F_UNKNOWNCMD)
 		mc5->stats.unknown_cmd++;
 	if (cause & F_DELACTEMPTY)
 		mc5->stats.del_act_empty++;
 	if (cause & MC5_INT_FATAL)
 		t3_fatal_err(adap);

 	t3_write_reg(adap, A_MC5_DB_INT_CAUSE, cause);
 }

 void t3_mc5_prep(struct adapter *adapter, struct mc5 *mc5, int mode)
 {
 #define K * 1024

 	static unsigned int tcam_part_size[] = {	/* in K 72-bit entries */
 		64 K, 128 K, 256 K, 32 K
 	};

 #undef K

 	u32 cfg = t3_read_reg(adapter, A_MC5_DB_CONFIG);

 	mc5->adapter = adapter;
 	mc5->mode = (unsigned char)mode;
 	mc5->part_type = (unsigned char)G_TMTYPE(cfg);
 	if (cfg & F_TMTYPEHI)
 		mc5->part_type |= 4;

 	mc5->tcam_size = tcam_part_size[G_TMPARTSIZE(cfg)];
 	if (mode == MC5_MODE_144_BIT)
 		mc5->tcam_size /= 2;
 }
	/*
	* Copyright (c) 2003-2008 Chelsio, Inc. All rights reserved.
	*
	* This software is available to you under a choice of one of two
	* licenses. You may choose to be licensed under the terms of the GNU
	* General Public License (GPL) Version 2, available from the file
	* COPYING in the main directory of this source tree, or the
	* OpenIB.org BSD license below:
	*
	* Redistribution and use in source and binary forms, with or
	* without modification, are permitted provided that the following
	* conditions are met:
	*
	* - Redistributions of source code must retain the above
	* copyright notice, this list of conditions and the following
	* disclaimer.
	*
	* - Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following
	* disclaimer in the documentation and/or other materials
	* provided with the distribution.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*/
	#include "common.h"
	#include "regs.h"

	enum {
	IDT75P52100 = 4,
	IDT75N43102 = 5
	};

	/* DBGI command mode */
	enum {
	DBGI_MODE_MBUS = 0,
	DBGI_MODE_IDT52100 = 5
	};

	/* IDT 75P52100 commands */
	#define IDT_CMD_READ 0
	#define IDT_CMD_WRITE 1
	#define IDT_CMD_SEARCH 2
	#define IDT_CMD_LEARN 3

	/* IDT LAR register address and value for 144-bit mode (low 32 bits) */
	#define IDT_LAR_ADR0 0x180006
	#define IDT_LAR_MODE144 0xffff0000

	/* IDT SCR and SSR addresses (low 32 bits) */
	#define IDT_SCR_ADR0 0x180000
	#define IDT_SSR0_ADR0 0x180002
	#define IDT_SSR1_ADR0 0x180004

	/* IDT GMR base address (low 32 bits) */
	#define IDT_GMR_BASE_ADR0 0x180020

	/* IDT data and mask array base addresses (low 32 bits) */
	#define IDT_DATARY_BASE_ADR0 0
	#define IDT_MSKARY_BASE_ADR0 0x80000

	/* IDT 75N43102 commands */
	#define IDT4_CMD_SEARCH144 3
	#define IDT4_CMD_WRITE 4
	#define IDT4_CMD_READ 5

	/* IDT 75N43102 SCR address (low 32 bits) */
	#define IDT4_SCR_ADR0 0x3

	/* IDT 75N43102 GMR base addresses (low 32 bits) */
	#define IDT4_GMR_BASE0 0x10
	#define IDT4_GMR_BASE1 0x20
	#define IDT4_GMR_BASE2 0x30

	/* IDT 75N43102 data and mask array base addresses (low 32 bits) */
	#define IDT4_DATARY_BASE_ADR0 0x1000000
	#define IDT4_MSKARY_BASE_ADR0 0x2000000

	#define MAX_WRITE_ATTEMPTS 5

	#define MAX_ROUTES 2048

	/*
	* Issue a command to the TCAM and wait for its completion. The address and
	* any data required by the command must have been setup by the caller.
	*/
	static int mc5_cmd_write(struct adapter *adapter, u32 cmd)
	{
	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_CMD, cmd);
	return t3_wait_op_done(adapter, A_MC5_DB_DBGI_RSP_STATUS,
	F_DBGIRSPVALID, 1, MAX_WRITE_ATTEMPTS, 1);
	}

	static inline void dbgi_wr_addr3(struct adapter *adapter, u32 v1, u32 v2,
	u32 v3)
	{
	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_ADDR0, v1);
	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_ADDR1, v2);
	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_ADDR2, v3);
	}

	static inline void dbgi_wr_data3(struct adapter *adapter, u32 v1, u32 v2,
	u32 v3)
	{
	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_DATA0, v1);
	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_DATA1, v2);
	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_DATA2, v3);
	}

	static inline void dbgi_rd_rsp3(struct adapter adapter, u32 v1, u32 *v2,
	u32 *v3)
	{
	*v1 = t3_read_reg(adapter, A_MC5_DB_DBGI_RSP_DATA0);
	*v2 = t3_read_reg(adapter, A_MC5_DB_DBGI_RSP_DATA1);
	*v3 = t3_read_reg(adapter, A_MC5_DB_DBGI_RSP_DATA2);
	}

	/*
	* Write data to the TCAM register at address (0, 0, addr_lo) using the TCAM
	* command cmd. The data to be written must have been set up by the caller.
	* Returns -1 on failure, 0 on success.
	*/
	static int mc5_write(struct adapter *adapter, u32 addr_lo, u32 cmd)
	{
	t3_write_reg(adapter, A_MC5_DB_DBGI_REQ_ADDR0, addr_lo);
	if (mc5_cmd_write(adapter, cmd) == 0)
	return 0;
	CH_ERR(adapter, "MC5 timeout writing to TCAM address 0x%x\n",
	addr_lo);
	return -1;
	}

	static int init_mask_data_array(struct mc5 *mc5, u32 mask_array_base,
	u32 data_array_base, u32 write_cmd,
	int addr_shift)
	{
	unsigned int i;
	struct adapter *adap = mc5->adapter;

	/*
	* We need the size of the TCAM data and mask arrays in terms of
	* 72-bit entries.
	*/
	unsigned int size72 = mc5->tcam_size;
	unsigned int server_base = t3_read_reg(adap, A_MC5_DB_SERVER_INDEX);

	if (mc5->mode == MC5_MODE_144_BIT) {
	size72 = 2; / 1 144-bit entry is 2 72-bit entries */
	server_base *= 2;
	}

	/* Clear the data array */
	dbgi_wr_data3(adap, 0, 0, 0);
	for (i = 0; i < size72; i++)
	if (mc5_write(adap, data_array_base + (i << addr_shift),
	write_cmd))
	return -1;

	/* Initialize the mask array. */
	dbgi_wr_data3(adap, 0xffffffff, 0xffffffff, 0xff);
	for (i = 0; i < size72; i++) {
	if (i == server_base) /* entering server or routing region */
	t3_write_reg(adap, A_MC5_DB_DBGI_REQ_DATA0,
	mc5->mode == MC5_MODE_144_BIT ?
	0xfffffff9 : 0xfffffffd);
	if (mc5_write(adap, mask_array_base + (i << addr_shift),
	write_cmd))
	return -1;
	}
	return 0;
	}

	static int init_idt52100(struct mc5 *mc5)
	{
	int i;
	struct adapter *adap = mc5->adapter;

	t3_write_reg(adap, A_MC5_DB_RSP_LATENCY,
	V_RDLAT(0x15) \| V_LRNLAT(0x15) \| V_SRCHLAT(0x15));
	t3_write_reg(adap, A_MC5_DB_PART_ID_INDEX, 2);

	/*
	* Use GMRs 14-15 for ELOOKUP, GMRs 12-13 for SYN lookups, and
	* GMRs 8-9 for ACK- and AOPEN searches.
	*/
	t3_write_reg(adap, A_MC5_DB_POPEN_DATA_WR_CMD, IDT_CMD_WRITE);
	t3_write_reg(adap, A_MC5_DB_POPEN_MASK_WR_CMD, IDT_CMD_WRITE);
	t3_write_reg(adap, A_MC5_DB_AOPEN_SRCH_CMD, IDT_CMD_SEARCH);
	t3_write_reg(adap, A_MC5_DB_AOPEN_LRN_CMD, IDT_CMD_LEARN);
	t3_write_reg(adap, A_MC5_DB_SYN_SRCH_CMD, IDT_CMD_SEARCH \| 0x6000);
	t3_write_reg(adap, A_MC5_DB_SYN_LRN_CMD, IDT_CMD_LEARN);
	t3_write_reg(adap, A_MC5_DB_ACK_SRCH_CMD, IDT_CMD_SEARCH);
	t3_write_reg(adap, A_MC5_DB_ACK_LRN_CMD, IDT_CMD_LEARN);
	t3_write_reg(adap, A_MC5_DB_ILOOKUP_CMD, IDT_CMD_SEARCH);
	t3_write_reg(adap, A_MC5_DB_ELOOKUP_CMD, IDT_CMD_SEARCH \| 0x7000);
	t3_write_reg(adap, A_MC5_DB_DATA_WRITE_CMD, IDT_CMD_WRITE);
	t3_write_reg(adap, A_MC5_DB_DATA_READ_CMD, IDT_CMD_READ);

	/* Set DBGI command mode for IDT TCAM. */
	t3_write_reg(adap, A_MC5_DB_DBGI_CONFIG, DBGI_MODE_IDT52100);

	/* Set up LAR */
	dbgi_wr_data3(adap, IDT_LAR_MODE144, 0, 0);
	if (mc5_write(adap, IDT_LAR_ADR0, IDT_CMD_WRITE))
	goto err;

	/* Set up SSRs */
	dbgi_wr_data3(adap, 0xffffffff, 0xffffffff, 0);
	if (mc5_write(adap, IDT_SSR0_ADR0, IDT_CMD_WRITE) \|\|
	mc5_write(adap, IDT_SSR1_ADR0, IDT_CMD_WRITE))
	goto err;

	/* Set up GMRs */
	for (i = 0; i < 32; ++i) {
	if (i >= 12 && i < 15)
	dbgi_wr_data3(adap, 0xfffffff9, 0xffffffff, 0xff);
	else if (i == 15)
	dbgi_wr_data3(adap, 0xfffffff9, 0xffff8007, 0xff);
	else
	dbgi_wr_data3(adap, 0xffffffff, 0xffffffff, 0xff);

	if (mc5_write(adap, IDT_GMR_BASE_ADR0 + i, IDT_CMD_WRITE))
	goto err;
	}

	/* Set up SCR */
	dbgi_wr_data3(adap, 1, 0, 0);
	if (mc5_write(adap, IDT_SCR_ADR0, IDT_CMD_WRITE))
	goto err;

	return init_mask_data_array(mc5, IDT_MSKARY_BASE_ADR0,
	IDT_DATARY_BASE_ADR0, IDT_CMD_WRITE, 0);
	err:
	return -EIO;
	}

	static int init_idt43102(struct mc5 *mc5)
	{
	int i;
	struct adapter *adap = mc5->adapter;

	t3_write_reg(adap, A_MC5_DB_RSP_LATENCY,
	adap->params.rev == 0 ? V_RDLAT(0xd) \| V_SRCHLAT(0x11) :
	V_RDLAT(0xd) \| V_SRCHLAT(0x12));

	/*
	* Use GMRs 24-25 for ELOOKUP, GMRs 20-21 for SYN lookups, and no mask
	* for ACK- and AOPEN searches.
	*/
	t3_write_reg(adap, A_MC5_DB_POPEN_DATA_WR_CMD, IDT4_CMD_WRITE);
	t3_write_reg(adap, A_MC5_DB_POPEN_MASK_WR_CMD, IDT4_CMD_WRITE);
	t3_write_reg(adap, A_MC5_DB_AOPEN_SRCH_CMD,
	IDT4_CMD_SEARCH144 \| 0x3800);
	t3_write_reg(adap, A_MC5_DB_SYN_SRCH_CMD, IDT4_CMD_SEARCH144);
	t3_write_reg(adap, A_MC5_DB_ACK_SRCH_CMD, IDT4_CMD_SEARCH144 \| 0x3800);
	t3_write_reg(adap, A_MC5_DB_ILOOKUP_CMD, IDT4_CMD_SEARCH144 \| 0x3800);
	t3_write_reg(adap, A_MC5_DB_ELOOKUP_CMD, IDT4_CMD_SEARCH144 \| 0x800);
	t3_write_reg(adap, A_MC5_DB_DATA_WRITE_CMD, IDT4_CMD_WRITE);
	t3_write_reg(adap, A_MC5_DB_DATA_READ_CMD, IDT4_CMD_READ);

	t3_write_reg(adap, A_MC5_DB_PART_ID_INDEX, 3);

	/* Set DBGI command mode for IDT TCAM. */
	t3_write_reg(adap, A_MC5_DB_DBGI_CONFIG, DBGI_MODE_IDT52100);

	/* Set up GMRs */
	dbgi_wr_data3(adap, 0xffffffff, 0xffffffff, 0xff);
	for (i = 0; i < 7; ++i)
	if (mc5_write(adap, IDT4_GMR_BASE0 + i, IDT4_CMD_WRITE))
	goto err;

	for (i = 0; i < 4; ++i)
	if (mc5_write(adap, IDT4_GMR_BASE2 + i, IDT4_CMD_WRITE))
	goto err;

	dbgi_wr_data3(adap, 0xfffffff9, 0xffffffff, 0xff);
	if (mc5_write(adap, IDT4_GMR_BASE1, IDT4_CMD_WRITE) \|\|
	mc5_write(adap, IDT4_GMR_BASE1 + 1, IDT4_CMD_WRITE) \|\|
	mc5_write(adap, IDT4_GMR_BASE1 + 4, IDT4_CMD_WRITE))
	goto err;

	dbgi_wr_data3(adap, 0xfffffff9, 0xffff8007, 0xff);
	if (mc5_write(adap, IDT4_GMR_BASE1 + 5, IDT4_CMD_WRITE))
	goto err;

	/* Set up SCR */
	dbgi_wr_data3(adap, 0xf0000000, 0, 0);
	if (mc5_write(adap, IDT4_SCR_ADR0, IDT4_CMD_WRITE))
	goto err;

	return init_mask_data_array(mc5, IDT4_MSKARY_BASE_ADR0,
	IDT4_DATARY_BASE_ADR0, IDT4_CMD_WRITE, 1);
	err:
	return -EIO;
	}

	/* Put MC5 in DBGI mode. */
	static inline void mc5_dbgi_mode_enable(const struct mc5 *mc5)
	{
	t3_write_reg(mc5->adapter, A_MC5_DB_CONFIG,
	V_TMMODE(mc5->mode == MC5_MODE_72_BIT) \| F_DBGIEN);
	}

	/* Put MC5 in M-Bus mode. */
	static void mc5_dbgi_mode_disable(const struct mc5 *mc5)
	{
	t3_write_reg(mc5->adapter, A_MC5_DB_CONFIG,
	V_TMMODE(mc5->mode == MC5_MODE_72_BIT) \|
	V_COMPEN(mc5->mode == MC5_MODE_72_BIT) \|
	V_PRTYEN(mc5->parity_enabled) \| F_MBUSEN);
	}

	/*
	* Initialization that requires the OS and protocol layers to already
	* be intialized goes here.
	*/
	int t3_mc5_init(struct mc5 *mc5, unsigned int nservers, unsigned int nfilters,
	unsigned int nroutes)
	{
	u32 cfg;
	int err;
	unsigned int tcam_size = mc5->tcam_size;
	struct adapter *adap = mc5->adapter;

	if (!tcam_size)
	return 0;

	if (nroutes > MAX_ROUTES \|\| nroutes + nservers + nfilters > tcam_size)
	return -EINVAL;

	/* Reset the TCAM */
	cfg = t3_read_reg(adap, A_MC5_DB_CONFIG) & ~F_TMMODE;
	cfg \|= V_TMMODE(mc5->mode == MC5_MODE_72_BIT) \| F_TMRST;
	t3_write_reg(adap, A_MC5_DB_CONFIG, cfg);
	if (t3_wait_op_done(adap, A_MC5_DB_CONFIG, F_TMRDY, 1, 500, 0)) {
	CH_ERR(adap, "TCAM reset timed out\n");
	return -1;
	}

	t3_write_reg(adap, A_MC5_DB_ROUTING_TABLE_INDEX, tcam_size - nroutes);
	t3_write_reg(adap, A_MC5_DB_FILTER_TABLE,
	tcam_size - nroutes - nfilters);
	t3_write_reg(adap, A_MC5_DB_SERVER_INDEX,
	tcam_size - nroutes - nfilters - nservers);

	mc5->parity_enabled = 1;

	/* All the TCAM addresses we access have only the low 32 bits non 0 */
	t3_write_reg(adap, A_MC5_DB_DBGI_REQ_ADDR1, 0);
	t3_write_reg(adap, A_MC5_DB_DBGI_REQ_ADDR2, 0);

	mc5_dbgi_mode_enable(mc5);

	switch (mc5->part_type) {
	case IDT75P52100:
	err = init_idt52100(mc5);
	break;
	case IDT75N43102:
	err = init_idt43102(mc5);
	break;
	default:
	CH_ERR(adap, "Unsupported TCAM type %d\n", mc5->part_type);
	err = -EINVAL;
	break;
	}

	mc5_dbgi_mode_disable(mc5);
	return err;
	}

	/*
	* read_mc5_range - dump a part of the memory managed by MC5
	* @mc5: the MC5 handle
	* @start: the start address for the dump
	* @n: number of 72-bit words to read
	* @buf: result buffer
	*
	* Read n 72-bit words from MC5 memory from the given start location.
	*/
	int t3_read_mc5_range(const struct mc5 *mc5, unsigned int start,
	unsigned int n, u32 *buf)
	{
	u32 read_cmd;
	int err = 0;
	struct adapter *adap = mc5->adapter;

	if (mc5->part_type == IDT75P52100)
	read_cmd = IDT_CMD_READ;
	else if (mc5->part_type == IDT75N43102)
	read_cmd = IDT4_CMD_READ;
	else
	return -EINVAL;

	mc5_dbgi_mode_enable(mc5);

	while (n--) {
	t3_write_reg(adap, A_MC5_DB_DBGI_REQ_ADDR0, start++);
	if (mc5_cmd_write(adap, read_cmd)) {
	err = -EIO;
	break;
	}
	dbgi_rd_rsp3(adap, buf + 2, buf + 1, buf);
	buf += 3;
	}

	mc5_dbgi_mode_disable(mc5);
	return 0;
	}

	#define MC5_INT_FATAL (F_PARITYERR \| F_REQQPARERR \| F_DISPQPARERR)

	/*
	* MC5 interrupt handler
	*/
	void t3_mc5_intr_handler(struct mc5 *mc5)
	{
	struct adapter *adap = mc5->adapter;
	u32 cause = t3_read_reg(adap, A_MC5_DB_INT_CAUSE);

	if ((cause & F_PARITYERR) && mc5->parity_enabled) {
	CH_ALERT(adap, "MC5 parity error\n");
	mc5->stats.parity_err++;
	}

	if (cause & F_REQQPARERR) {
	CH_ALERT(adap, "MC5 request queue parity error\n");
	mc5->stats.reqq_parity_err++;
	}

	if (cause & F_DISPQPARERR) {
	CH_ALERT(adap, "MC5 dispatch queue parity error\n");
	mc5->stats.dispq_parity_err++;
	}

	if (cause & F_ACTRGNFULL)
	mc5->stats.active_rgn_full++;
	if (cause & F_NFASRCHFAIL)
	mc5->stats.nfa_srch_err++;
	if (cause & F_UNKNOWNCMD)
	mc5->stats.unknown_cmd++;
	if (cause & F_DELACTEMPTY)
	mc5->stats.del_act_empty++;
	if (cause & MC5_INT_FATAL)
	t3_fatal_err(adap);

	t3_write_reg(adap, A_MC5_DB_INT_CAUSE, cause);
	}

	void t3_mc5_prep(struct adapter adapter, struct mc5 mc5, int mode)
	{
	#define K * 1024

	static unsigned int tcam_part_size[] = { /* in K 72-bit entries */
	64 K, 128 K, 256 K, 32 K
	};

	#undef K

	u32 cfg = t3_read_reg(adapter, A_MC5_DB_CONFIG);

	mc5->adapter = adapter;
	mc5->mode = (unsigned char)mode;
	mc5->part_type = (unsigned char)G_TMTYPE(cfg);
	if (cfg & F_TMTYPEHI)
	mc5->part_type \|= 4;

	mc5->tcam_size = tcam_part_size[G_TMPARTSIZE(cfg)];
	if (mode == MC5_MODE_144_BIT)
	mc5->tcam_size /= 2;
	}