powerpc/b4860qds: add workaround for XFI

XFI does not work stable on current board, it's due to heat sink issue,
to make it work stable the board needs additional heat sink, enable two
XFI lanes only. Right now we do not have such an erratum for the issue,
so use a define CONFIG_SYS_FSL_B4860QDS_XFI_ERR to identify it.
The workaround will only be used in XFI protocols and only if the
hwconfig indicates that XFI is prefered.

A new VSC3308 config function is used instead of re-use the original
function, to avoid making the function complex and ugly.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

arch/powerpc/cpu/mpc85xx/cmd_errata.c

@@ -319,6 +319,10 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	if (IS_SVR_REV(svr, 1, 0))
 		puts("Work-around for Erratum A-008044 enabled\n");
 #endif
+#if defined(CONFIG_SYS_FSL_B4860QDS_XFI_ERR) && defined(CONFIG_B4860QDS)
+	puts("Work-around for Erratum XFI on B4860QDS enabled\n");
+#endif
+
 	return 0;
 }
 

board/freescale/b4860qds/b4860qds.c

@@ -548,6 +548,18 @@ int configure_vsc3316_3308(void)
 
 			if (hwconfig_subarg_cmp_f("fsl_b4860_serdes2",
 						  "sfp_amc", "sfp", buf)) {
+#ifdef CONFIG_SYS_FSL_B4860QDS_XFI_ERR
+				/* change default VSC3308 for XFI erratum */
+				ret = vsc3308_config_adjust(VSC3308_TX_ADDRESS,
+						vsc08_tx_sfp, num_vsc08_con);
+				if (ret)
+					return ret;
+
+				ret = vsc3308_config_adjust(VSC3308_RX_ADDRESS,
+						vsc08_rx_sfp, num_vsc08_con);
+				if (ret)
+					return ret;
+#else
 				ret = vsc3308_config(VSC3308_TX_ADDRESS,
 						vsc08_tx_sfp, num_vsc08_con);
 				if (ret)
@@ -557,6 +569,7 @@ int configure_vsc3316_3308(void)
 						vsc08_rx_sfp, num_vsc08_con);
 				if (ret)
 					return ret;
+#endif
 			} else {
 				ret = vsc3308_config(VSC3308_TX_ADDRESS,
 						vsc08_tx_amc, num_vsc08_con);

board/freescale/common/vsc3316_3308.c

@@ -13,7 +13,12 @@
 #define INPUT_STATE_REG		0x13
 #define GLOBAL_INPUT_ISE1		0x51
 #define GLOBAL_INPUT_ISE2		0x52
+#define GLOBAL_INPUT_GAIN		0x53
 #define GLOBAL_INPUT_LOS		0x55
+#define GLOBAL_OUTPUT_PE1		0x56
+#define GLOBAL_OUTPUT_PE2		0x57
+#define GLOBAL_OUTPUT_LEVEL		0x58
+#define GLOBAL_OUTPUT_TERMINATION	0x5A
 #define GLOBAL_CORE_CNTRL		0x5D
 #define OUTPUT_MODE_PAGE		0x23
 #define CORE_CONTROL_PAGE		0x25
@@ -92,6 +97,109 @@ int vsc3316_config(unsigned int vsc_addr, int8_t con_arr[][2],
 	return 0;
 }
 
+#ifdef CONFIG_SYS_FSL_B4860QDS_XFI_ERR
+int vsc3308_config_adjust(unsigned int vsc_addr, const int8_t con_arr[][2],
+		unsigned int num_con)
+{
+	unsigned int i;
+	u8 rev_id = 0;
+	int ret;
+
+	debug("VSC:Initializing VSC3308 at I2C address 0x%x for Tx\n",
+	      vsc_addr);
+
+	ret = i2c_read(vsc_addr, REVISION_ID_REG, 1, &rev_id, 1);
+	if (ret < 0) {
+		printf("VSC:0x%x could not read REV_ID from device.\n",
+		       vsc_addr);
+		return ret;
+	}
+
+	if (rev_id != 0xab) {
+		printf("VSC: device at address 0x%x is not VSC3316/3308.\n",
+		       vsc_addr);
+		return -ENODEV;
+	}
+
+	ret = vsc_if_enable(vsc_addr);
+	if (ret) {
+		printf("VSC:0x%x could not configured for 2-wire I/F.\n",
+		       vsc_addr);
+		return ret;
+	}
+
+	/* config connections - page 0x00 */
+	i2c_reg_write(vsc_addr, CURRENT_PAGE_REGISTER, CONNECTION_CONFIG_PAGE);
+
+	/* Configure Global Input ISE */
+	i2c_reg_write(vsc_addr, GLOBAL_INPUT_ISE1, 0);
+	i2c_reg_write(vsc_addr, GLOBAL_INPUT_ISE2, 0);
+
+	/* Configure Tx/Rx Global Output PE1 */
+	i2c_reg_write(vsc_addr, GLOBAL_OUTPUT_PE1, 0);
+
+	/* Configure Tx/Rx Global Output PE2 */
+	i2c_reg_write(vsc_addr, GLOBAL_OUTPUT_PE2, 0);
+
+	/* Configure Tx/Rx Global Input GAIN */
+	i2c_reg_write(vsc_addr, GLOBAL_INPUT_GAIN, 0x3F);
+
+	/* Setting Global Input LOS threshold value */
+	i2c_reg_write(vsc_addr, GLOBAL_INPUT_LOS, 0xE0);
+
+	/* Setting Global output termination */
+	i2c_reg_write(vsc_addr, GLOBAL_OUTPUT_TERMINATION, 0);
+
+	/* Configure Tx/Rx Global Output level */
+	if (vsc_addr == VSC3308_TX_ADDRESS)
+		i2c_reg_write(vsc_addr, GLOBAL_OUTPUT_LEVEL, 4);
+	else
+		i2c_reg_write(vsc_addr, GLOBAL_OUTPUT_LEVEL, 2);
+
+	/* Making crosspoint connections, by connecting required
+	 * input to output */
+	for (i = 0; i < num_con ; i++)
+		i2c_reg_write(vsc_addr, con_arr[i][1], con_arr[i][0]);
+
+	/* input state - page 0x13 */
+	i2c_reg_write(vsc_addr, CURRENT_PAGE_REGISTER, INPUT_STATE_REG);
+	/* Turning off all the required input of the switch */
+	for (i = 0; i < num_con; i++)
+		i2c_reg_write(vsc_addr, con_arr[i][0], 1);
+
+	/* only turn on specific Tx/Rx requested by the XFI erratum */
+	if (vsc_addr == VSC3308_TX_ADDRESS) {
+		i2c_reg_write(vsc_addr, 2, 0);
+		i2c_reg_write(vsc_addr, 3, 0);
+	} else {
+		i2c_reg_write(vsc_addr, 0, 0);
+		i2c_reg_write(vsc_addr, 1, 0);
+	}
+
+	/* config output mode - page 0x23 */
+	i2c_reg_write(vsc_addr, CURRENT_PAGE_REGISTER, OUTPUT_MODE_PAGE);
+	/* Turn off the Output driver correspond to required output*/
+	for (i = 0; i < num_con ; i++)
+		i2c_reg_write(vsc_addr,  con_arr[i][1], 1);
+
+	/* only turn on specific Tx/Rx requested by the XFI erratum */
+	if (vsc_addr == VSC3308_TX_ADDRESS) {
+		i2c_reg_write(vsc_addr, 0, 0);
+		i2c_reg_write(vsc_addr, 1, 0);
+	} else {
+		i2c_reg_write(vsc_addr, 3, 0);
+		i2c_reg_write(vsc_addr, 4, 0);
+	}
+
+	/* configure global core control register, Turn on Global core power */
+	i2c_reg_write(vsc_addr, GLOBAL_CORE_CNTRL, 0);
+
+	vsc_wp_config(vsc_addr);
+
+	return 0;
+}
+#endif
+
 int vsc3308_config(unsigned int vsc_addr, const int8_t con_arr[][2],
 		unsigned int num_con)
 {

board/freescale/common/vsc3316_3308.h

@@ -14,6 +14,10 @@
 int vsc_if_enable(unsigned int vsc_addr);
 int vsc3316_config(unsigned int vsc_addr, int8_t con_arr[][2],
 		unsigned int num_con);
+#ifdef CONFIG_SYS_FSL_B4860QDS_XFI_ERR
+int vsc3308_config_adjust(unsigned int vsc_addr, const int8_t con_arr[][2],
+		unsigned int num_con);
+#endif
 int vsc3308_config(unsigned int vsc_addr, const int8_t con_arr[][2],
 		unsigned int num_con);
 void vsc_wp_config(unsigned int vsc_addr);

include/configs/B4860QDS.h

@@ -731,6 +731,8 @@ unsigned long get_board_ddr_clk(void);
 #define CONFIG_PHY_GIGE		/* Include GbE speed/duplex detection */
 #endif
 
+#define CONFIG_SYS_FSL_B4860QDS_XFI_ERR
+
 /*
  * Environment
  */