Add support for the latest 1G/10G Chelsio adapter, T3.

This driver is required by the Chelsio T3 RDMA driver posted by
Steve Wise.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 453 insertions, 0 deletions

diff --git a/drivers/net/cxgb3/mc5.c b/drivers/net/cxgb3/mc5.c
new file mode 100644
index 000000000000..44fa9eaedcc3
--- /dev/null
+++ b/drivers/net/cxgb3/mc5.c
@@ -0,0 +1,453 @@
+/*
+ * This file is part of the Chelsio T3 Ethernet driver.
+ *
+ * Copyright (C) 2003-2006 Chelsio Communications.  All rights reserved.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the LICENSE file included in this
+ * release for licensing terms and conditions.
+ */
+
+#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 (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 __devinit 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;
+}