[PATCH] S2io: Offline diagnostics fixes

This patch fixes the following bugs with offline diagnostics
code(run with "ethtool -t").

1. After running offline diagnostics, adapter would report
corrupted packets on receive. This was because of adapter not
being brought out of "RLDRAM test mode".
2. Current EEPROM test works only for Xframe I. Since Xframe II
uses different interface(SPI), support for this interface has
been added. Also, since SPI supports write access to all areas
of EEPROM, negative testing is done only for Xframe I.
3. Return values from subfunctions of offline diagnostics have
been corrected.
4. In register test, expected value from rx_queue_cfg register
is made to depend on adapter type.
5. After the test, need to restore values at EEPROM offsets
0x4F0 and 0x7F0. These locations were modified as part of test.
6. Use macro SPECIAL_REG_WRITE for write access to mc_rldram_test_ctrl
register. Also, couple of unnecessary writes to mc_rldram_test_ctrl
have been removed.

Signed-off-by: Ravinandan Arakali <ravinandan.arakali@neterion.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

2 files changed, 162 insertions, 80 deletions

diff --git a/drivers/net/s2io-regs.h b/drivers/net/s2io-regs.h
index 7cefe5507b9..00179bc3437 100644
--- a/drivers/net/s2io-regs.h
+++ b/drivers/net/s2io-regs.h
@@ -814,6 +814,17 @@ typedef struct _XENA_dev_config {
 	u64 rxgxs_ber_0;	/* CHANGED */
 	u64 rxgxs_ber_1;	/* CHANGED */
 
+	u64 spi_control;
+#define SPI_CONTROL_KEY(key)		vBIT(key,0,4)
+#define SPI_CONTROL_BYTECNT(cnt)	vBIT(cnt,29,3)
+#define SPI_CONTROL_CMD(cmd)		vBIT(cmd,32,8)
+#define SPI_CONTROL_ADDR(addr)		vBIT(addr,40,24)
+#define SPI_CONTROL_SEL1		BIT(4)
+#define SPI_CONTROL_REQ			BIT(7)
+#define SPI_CONTROL_NACK		BIT(5)
+#define SPI_CONTROL_DONE		BIT(6)
+	u64 spi_data;
+#define SPI_DATA_WRITE(data,len)	vBIT(data,0,len)
 } XENA_dev_config_t;
 
 #define XENA_REG_SPACE	sizeof(XENA_dev_config_t)
diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index fcf61107046..30fbaf04773 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -4378,29 +4378,53 @@ static int s2io_ethtool_setpause_data(struct net_device *dev,
  */
 
 #define S2IO_DEV_ID		5
-static int read_eeprom(nic_t * sp, int off, u32 * data)
+static int read_eeprom(nic_t * sp, int off, u64 * data)
 {
 	int ret = -1;
 	u32 exit_cnt = 0;
 	u64 val64;
 	XENA_dev_config_t __iomem *bar0 = sp->bar0;
 
-	val64 = I2C_CONTROL_DEV_ID(S2IO_DEV_ID) | I2C_CONTROL_ADDR(off) |
-	    I2C_CONTROL_BYTE_CNT(0x3) | I2C_CONTROL_READ |
-	    I2C_CONTROL_CNTL_START;
-	SPECIAL_REG_WRITE(val64, &bar0->i2c_control, LF);
+	if (sp->device_type == XFRAME_I_DEVICE) {
+		val64 = I2C_CONTROL_DEV_ID(S2IO_DEV_ID) | I2C_CONTROL_ADDR(off) |
+		    I2C_CONTROL_BYTE_CNT(0x3) | I2C_CONTROL_READ |
+		    I2C_CONTROL_CNTL_START;
+		SPECIAL_REG_WRITE(val64, &bar0->i2c_control, LF);
 
-	while (exit_cnt < 5) {
-		val64 = readq(&bar0->i2c_control);
-		if (I2C_CONTROL_CNTL_END(val64)) {
-			*data = I2C_CONTROL_GET_DATA(val64);
-			ret = 0;
-			break;
+		while (exit_cnt < 5) {
+			val64 = readq(&bar0->i2c_control);
+			if (I2C_CONTROL_CNTL_END(val64)) {
+				*data = I2C_CONTROL_GET_DATA(val64);
+				ret = 0;
+				break;
+			}
+			msleep(50);
+			exit_cnt++;
 		}
-		msleep(50);
-		exit_cnt++;
 	}
 
+	if (sp->device_type == XFRAME_II_DEVICE) {
+		val64 = SPI_CONTROL_KEY(0x9) | SPI_CONTROL_SEL1 |
+			SPI_CONTROL_BYTECNT(0x3) | 
+			SPI_CONTROL_CMD(0x3) | SPI_CONTROL_ADDR(off);
+		SPECIAL_REG_WRITE(val64, &bar0->spi_control, LF);
+		val64 |= SPI_CONTROL_REQ;
+		SPECIAL_REG_WRITE(val64, &bar0->spi_control, LF);
+		while (exit_cnt < 5) {
+			val64 = readq(&bar0->spi_control);
+			if (val64 & SPI_CONTROL_NACK) {
+				ret = 1;
+				break;
+			} else if (val64 & SPI_CONTROL_DONE) {
+				*data = readq(&bar0->spi_data);
+				*data &= 0xffffff;
+				ret = 0;
+				break;
+			}
+			msleep(50);
+			exit_cnt++;
+		}
+	}
 	return ret;
 }
 
@@ -4419,28 +4443,53 @@ static int read_eeprom(nic_t * sp, int off, u32 * data)
  *  0 on success, -1 on failure.
  */
 
-static int write_eeprom(nic_t * sp, int off, u32 data, int cnt)
+static int write_eeprom(nic_t * sp, int off, u64 data, int cnt)
 {
 	int exit_cnt = 0, ret = -1;
 	u64 val64;
 	XENA_dev_config_t __iomem *bar0 = sp->bar0;
 
-	val64 = I2C_CONTROL_DEV_ID(S2IO_DEV_ID) | I2C_CONTROL_ADDR(off) |
-	    I2C_CONTROL_BYTE_CNT(cnt) | I2C_CONTROL_SET_DATA(data) |
-	    I2C_CONTROL_CNTL_START;
-	SPECIAL_REG_WRITE(val64, &bar0->i2c_control, LF);
+	if (sp->device_type == XFRAME_I_DEVICE) {
+		val64 = I2C_CONTROL_DEV_ID(S2IO_DEV_ID) | I2C_CONTROL_ADDR(off) |
+		    I2C_CONTROL_BYTE_CNT(cnt) | I2C_CONTROL_SET_DATA((u32)data) |
+		    I2C_CONTROL_CNTL_START;
+		SPECIAL_REG_WRITE(val64, &bar0->i2c_control, LF);
+
+		while (exit_cnt < 5) {
+			val64 = readq(&bar0->i2c_control);
+			if (I2C_CONTROL_CNTL_END(val64)) {
+				if (!(val64 & I2C_CONTROL_NACK))
+					ret = 0;
+				break;
+			}
+			msleep(50);
+			exit_cnt++;
+		}
+	}
 
-	while (exit_cnt < 5) {
-		val64 = readq(&bar0->i2c_control);
-		if (I2C_CONTROL_CNTL_END(val64)) {
-			if (!(val64 & I2C_CONTROL_NACK))
+	if (sp->device_type == XFRAME_II_DEVICE) {
+		int write_cnt = (cnt == 8) ? 0 : cnt;
+		writeq(SPI_DATA_WRITE(data,(cnt<<3)), &bar0->spi_data);
+
+		val64 = SPI_CONTROL_KEY(0x9) | SPI_CONTROL_SEL1 |
+			SPI_CONTROL_BYTECNT(write_cnt) | 
+			SPI_CONTROL_CMD(0x2) | SPI_CONTROL_ADDR(off);
+		SPECIAL_REG_WRITE(val64, &bar0->spi_control, LF);
+		val64 |= SPI_CONTROL_REQ;
+		SPECIAL_REG_WRITE(val64, &bar0->spi_control, LF);
+		while (exit_cnt < 5) {
+			val64 = readq(&bar0->spi_control);
+			if (val64 & SPI_CONTROL_NACK) {
+				ret = 1;
+				break;
+			} else if (val64 & SPI_CONTROL_DONE) {
 				ret = 0;
-			break;
+				break;
+			}
+			msleep(50);
+			exit_cnt++;
 		}
-		msleep(50);
-		exit_cnt++;
 	}
-
 	return ret;
 }
 
@@ -4460,7 +4509,8 @@ static int write_eeprom(nic_t * sp, int off, u32 data, int cnt)
 static int s2io_ethtool_geeprom(struct net_device *dev,
 			 struct ethtool_eeprom *eeprom, u8 * data_buf)
 {
-	u32 data, i, valid;
+	u32 i, valid;
+	u64 data;
 	nic_t *sp = dev->priv;
 
 	eeprom->magic = sp->pdev->vendor | (sp->pdev->device << 16);
@@ -4498,7 +4548,7 @@ static int s2io_ethtool_seeprom(struct net_device *dev,
 				u8 * data_buf)
 {
 	int len = eeprom->len, cnt = 0;
-	u32 valid = 0, data;
+	u64 valid = 0, data;
 	nic_t *sp = dev->priv;
 
 	if (eeprom->magic != (sp->pdev->vendor | (sp->pdev->device << 16))) {
@@ -4546,7 +4596,7 @@ static int s2io_ethtool_seeprom(struct net_device *dev,
 static int s2io_register_test(nic_t * sp, uint64_t * data)
 {
 	XENA_dev_config_t __iomem *bar0 = sp->bar0;
-	u64 val64 = 0;
+	u64 val64 = 0, exp_val;
 	int fail = 0;
 
 	val64 = readq(&bar0->pif_rd_swapper_fb);
@@ -4562,7 +4612,11 @@ static int s2io_register_test(nic_t * sp, uint64_t * data)
 	}
 
 	val64 = readq(&bar0->rx_queue_cfg);
-	if (val64 != 0x0808080808080808ULL) {
+	if (sp->device_type == XFRAME_II_DEVICE)
+		exp_val = 0x0404040404040404ULL;
+	else
+		exp_val = 0x0808080808080808ULL;
+	if (val64 != exp_val) {
 		fail = 1;
 		DBG_PRINT(INFO_DBG, "Read Test level 3 fails\n");
 	}
@@ -4590,7 +4644,7 @@ static int s2io_register_test(nic_t * sp, uint64_t * data)
 	}
 
 	*data = fail;
-	return 0;
+	return fail;
 }
 
 /**
@@ -4609,58 +4663,83 @@ static int s2io_register_test(nic_t * sp, uint64_t * data)
 static int s2io_eeprom_test(nic_t * sp, uint64_t * data)
 {
 	int fail = 0;
-	u32 ret_data;
+	u64 ret_data, org_4F0, org_7F0;
+	u8 saved_4F0 = 0, saved_7F0 = 0;
+	struct net_device *dev = sp->dev;
 
 	/* Test Write Error at offset 0 */
-	if (!write_eeprom(sp, 0, 0, 3))
-		fail = 1;
+	/* Note that SPI interface allows write access to all areas
+	 * of EEPROM. Hence doing all negative testing only for Xframe I.
+	 */
+	if (sp->device_type == XFRAME_I_DEVICE)
+		if (!write_eeprom(sp, 0, 0, 3))
+			fail = 1;
+
+	/* Save current values at offsets 0x4F0 and 0x7F0 */
+	if (!read_eeprom(sp, 0x4F0, &org_4F0))
+		saved_4F0 = 1;
+	if (!read_eeprom(sp, 0x7F0, &org_7F0))
+		saved_7F0 = 1;
 
 	/* Test Write at offset 4f0 */
-	if (write_eeprom(sp, 0x4F0, 0x01234567, 3))
+	if (write_eeprom(sp, 0x4F0, 0x012345, 3))
 		fail = 1;
 	if (read_eeprom(sp, 0x4F0, &ret_data))
 		fail = 1;
 
-	if (ret_data != 0x01234567)
+	if (ret_data != 0x012345) {
+		DBG_PRINT(ERR_DBG, "%s: eeprom test error at offset 0x4F0. Data written %llx Data read %llx\n", dev->name, (u64)0x12345, ret_data); 
 		fail = 1;
+	}
 
 	/* Reset the EEPROM data go FFFF */
-	write_eeprom(sp, 0x4F0, 0xFFFFFFFF, 3);
+	write_eeprom(sp, 0x4F0, 0xFFFFFF, 3);
 
 	/* Test Write Request Error at offset 0x7c */
-	if (!write_eeprom(sp, 0x07C, 0, 3))
-		fail = 1;
+	if (sp->device_type == XFRAME_I_DEVICE)
+		if (!write_eeprom(sp, 0x07C, 0, 3))
+			fail = 1;
 
-	/* Test Write Request at offset 0x7fc */
-	if (write_eeprom(sp, 0x7FC, 0x01234567, 3))
+	/* Test Write Request at offset 0x7f0 */
+	if (write_eeprom(sp, 0x7F0, 0x012345, 3))
 		fail = 1;
-	if (read_eeprom(sp, 0x7FC, &ret_data))
+	if (read_eeprom(sp, 0x7F0, &ret_data))
 		fail = 1;
 
-	if (ret_data != 0x01234567)
+	if (ret_data != 0x012345) {
+		DBG_PRINT(ERR_DBG, "%s: eeprom test error at offset 0x7F0. Data written %llx Data read %llx\n", dev->name, (u64)0x12345, ret_data); 
 		fail = 1;
+	}
 
 	/* Reset the EEPROM data go FFFF */
-	write_eeprom(sp, 0x7FC, 0xFFFFFFFF, 3);
+	write_eeprom(sp, 0x7F0, 0xFFFFFF, 3);
 
-	/* Test Write Error at offset 0x80 */
-	if (!write_eeprom(sp, 0x080, 0, 3))
-		fail = 1;
+	if (sp->device_type == XFRAME_I_DEVICE) {
+		/* Test Write Error at offset 0x80 */
+		if (!write_eeprom(sp, 0x080, 0, 3))
+			fail = 1;
 
-	/* Test Write Error at offset 0xfc */
-	if (!write_eeprom(sp, 0x0FC, 0, 3))
-		fail = 1;
+		/* Test Write Error at offset 0xfc */
+		if (!write_eeprom(sp, 0x0FC, 0, 3))
+			fail = 1;
 
-	/* Test Write Error at offset 0x100 */
-	if (!write_eeprom(sp, 0x100, 0, 3))
-		fail = 1;
+		/* Test Write Error at offset 0x100 */
+		if (!write_eeprom(sp, 0x100, 0, 3))
+			fail = 1;
 
-	/* Test Write Error at offset 4ec */
-	if (!write_eeprom(sp, 0x4EC, 0, 3))
-		fail = 1;
+		/* Test Write Error at offset 4ec */
+		if (!write_eeprom(sp, 0x4EC, 0, 3))
+			fail = 1;
+	}
+
+	/* Restore values at offsets 0x4F0 and 0x7F0 */
+	if (saved_4F0)
+		write_eeprom(sp, 0x4F0, org_4F0, 3);
+	if (saved_7F0)
+		write_eeprom(sp, 0x7F0, org_7F0, 3);
 
 	*data = fail;
-	return 0;
+	return fail;
 }
 
 /**
@@ -4742,7 +4821,7 @@ static int s2io_rldram_test(nic_t * sp, uint64_t * data)
 {
 	XENA_dev_config_t __iomem *bar0 = sp->bar0;
 	u64 val64;
-	int cnt, iteration = 0, test_pass = 0;
+	int cnt, iteration = 0, test_fail = 0;
 
 	val64 = readq(&bar0->adapter_control);
 	val64 &= ~ADAPTER_ECC_EN;
@@ -4750,7 +4829,7 @@ static int s2io_rldram_test(nic_t * sp, uint64_t * data)
 
 	val64 = readq(&bar0->mc_rldram_test_ctrl);
 	val64 |= MC_RLDRAM_TEST_MODE;
-	writeq(val64, &bar0->mc_rldram_test_ctrl);
+	SPECIAL_REG_WRITE(val64, &bar0->mc_rldram_test_ctrl, LF);
 
 	val64 = readq(&bar0->mc_rldram_mrs);
 	val64 |= MC_RLDRAM_QUEUE_SIZE_ENABLE;
@@ -4778,17 +4857,12 @@ static int s2io_rldram_test(nic_t * sp, uint64_t * data)
 		}
 		writeq(val64, &bar0->mc_rldram_test_d2);
 
-		val64 = (u64) (0x0000003fffff0000ULL);
+		val64 = (u64) (0x0000003ffffe0100ULL);
 		writeq(val64, &bar0->mc_rldram_test_add);
 
-
-		val64 = MC_RLDRAM_TEST_MODE;
-		writeq(val64, &bar0->mc_rldram_test_ctrl);
-
-		val64 |=
-		    MC_RLDRAM_TEST_MODE | MC_RLDRAM_TEST_WRITE |
-		    MC_RLDRAM_TEST_GO;
-		writeq(val64, &bar0->mc_rldram_test_ctrl);
+		val64 = MC_RLDRAM_TEST_MODE | MC_RLDRAM_TEST_WRITE |
+		    	MC_RLDRAM_TEST_GO;
+		SPECIAL_REG_WRITE(val64, &bar0->mc_rldram_test_ctrl, LF);
 
 		for (cnt = 0; cnt < 5; cnt++) {
 			val64 = readq(&bar0->mc_rldram_test_ctrl);
@@ -4800,11 +4874,8 @@ static int s2io_rldram_test(nic_t * sp, uint64_t * data)
 		if (cnt == 5)
 			break;
 
-		val64 = MC_RLDRAM_TEST_MODE;
-		writeq(val64, &bar0->mc_rldram_test_ctrl);
-
-		val64 |= MC_RLDRAM_TEST_MODE | MC_RLDRAM_TEST_GO;
-		writeq(val64, &bar0->mc_rldram_test_ctrl);
+		val64 = MC_RLDRAM_TEST_MODE | MC_RLDRAM_TEST_GO;
+		SPECIAL_REG_WRITE(val64, &bar0->mc_rldram_test_ctrl, LF);
 
 		for (cnt = 0; cnt < 5; cnt++) {
 			val64 = readq(&bar0->mc_rldram_test_ctrl);
@@ -4817,18 +4888,18 @@ static int s2io_rldram_test(nic_t * sp, uint64_t * data)
 			break;
 
 		val64 = readq(&bar0->mc_rldram_test_ctrl);
-		if (val64 & MC_RLDRAM_TEST_PASS)
-			test_pass = 1;
+		if (!(val64 & MC_RLDRAM_TEST_PASS))
+			test_fail = 1;
 
 		iteration++;
 	}
 
-	if (!test_pass)
-		*data = 1;
-	else
-		*data = 0;
+	*data = test_fail;
 
-	return 0;
+	/* Bring the adapter out of test mode */
+	SPECIAL_REG_WRITE(0, &bar0->mc_rldram_test_ctrl, LF);
+
+	return test_fail;
 }
 
 /**