This patch adds the BitBangedI2c kernel module parameter, which allows
to expose bit-banged i2c buses to the operating system. This is necessary
for custom board designs based on igb-supported chips that wish to
make use of the available i2c pins.
Signed-off-by: Jean-Hugues Deschenes <jean-hugues.desche...@octasic.com>
Index: igb-5.2.9.4/src/igb.h
===================================================================
--- igb-5.2.9.4.orig/src/igb.h 2014-12-11 11:48:34.820033342 -0500
+++ igb-5.2.9.4/src/igb.h 2014-12-19 10:20:50.335856480 -0500
@@ -601,6 +601,8 @@
unsigned int vfs_allocated_count;
/* Malicious Driver Detection flag. Valid only when SR-IOV is enabled */
bool mdd;
+ /* Flag for unconditionally exposing the SFP pins as I2C bus (not just
i350) */
+ uint i2cbb;
int int_mode;
u32 rss_queues;
u32 tss_queues;
Index: igb-5.2.9.4/src/igb_main.c
===================================================================
--- igb-5.2.9.4.orig/src/igb_main.c 2014-12-11 11:49:06.268034458 -0500
+++ igb-5.2.9.4/src/igb_main.c 2014-12-11 11:49:23.368035065 -0500
@@ -1725,8 +1725,8 @@
{
s32 status = E1000_SUCCESS;
- /* I2C interface supported on i350 devices */
- if (adapter->hw.mac.type != e1000_i350)
+ /* I2C interface supported on i350 devices (unless forced) */
+ if (adapter->hw.mac.type != e1000_i350 && !adapter->i2cbb)
return E1000_SUCCESS;
/* Initialize the i2c bus which is controlled by the registers.
@@ -2032,7 +2032,9 @@
igb_init_dmac(adapter, pba);
/* Re-initialize the thermal sensor on i350 devices. */
- if (mac->type == e1000_i350 && hw->bus.func == 0) {
+ if (adapter->i2cbb)
+ e1000_set_i2c_bb(hw);
+ else if (mac->type == e1000_i350 && hw->bus.func == 0) {
/*
* If present, re-initialize the external thermal sensor
* interface.
Index: igb-5.2.9.4/src/igb_param.c
===================================================================
--- igb-5.2.9.4.orig/src/igb_param.c 2014-12-11 11:48:34.796033341 -0500
+++ igb-5.2.9.4/src/igb_param.c 2014-12-19 10:23:23.675856396 -0500
@@ -178,6 +178,19 @@
IGB_PARAM(MDD,
"Malicious Driver Detection (0/1), default 1 = enabled. Only available
when max_vfs is greater than 0");
+#ifdef HAVE_I2C_SUPPORT
+/* BitBangedI2c (Enable bit-banged i2c bus)
+ *
+ * Always enabled on i350.
+ *
+ * Valid Range: 0, 1
+ *
+ * Default Value: 0
+ */
+IGB_PARAM(BitBangedI2c,
+ "Bit-banged i2c busses (0/1), default 0 = disabled. Always enabled on
i350.");
+#endif /* HAVE_I2C_SUPPORT */
+
#ifdef DEBUG
/* Disable Hardware Reset on Tx Hang
@@ -868,5 +881,29 @@
}
#endif
}
+#ifdef HAVE_I2C_SUPPORT
+ { /* BitBangedI2c - Enable bit-banged i2c bus support. */
+ struct igb_option opt = {
+ .type = enable_option,
+ .name = "Bit-banged i2c",
+ .err = "defaulting to 0",
+ .def = OPTION_DISABLED,
+ .arg = { .r = { .min = OPTION_DISABLED,
+ .max = OPTION_ENABLED } }
+ };
+
+#ifdef module_param_array
+ if (num_BitBangedI2c > bd) {
+#endif
+ adapter->i2cbb = BitBangedI2c[bd];
+ igb_validate_option((uint *)&adapter->i2cbb, &opt,
+ adapter);
+#ifdef module_param_array
+ } else {
+ adapter->i2cbb = opt.def;
+ }
+#endif
+ }
+#endif /* HAVE_I2C_SUPPORT */
}
------------------------------------------------------------------------------
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