Add RL_TWISTER_ENABLE option. This enables the magic bits to do long

cable tuning.  This has helped in some installations for hardware
deployed by a former employer.  Made optional because the lists aren't
full of complaints about these cards... even when they were wildly
popular.

Reviewed by:	attilio@, jhb@, trhodes@ (all an older version of the patch)

1 files changed, 30 insertions, 0 deletions

diff --git a/sys/pci/if_rlreg.h b/sys/pci/if_rlreg.h
index c75365c..f33eaed 100644
--- a/sys/pci/if_rlreg.h
+++ b/sys/pci/if_rlreg.h
@@ -309,6 +309,27 @@
 #define RL_CMD_RESET		0x0010
 
 /*
+ * Twister register values.  These are completely undocumented and derived
+ * from public sources.
+ */
+#define RL_CSCFG_LINK_OK	0x0400
+#define RL_CSCFG_CHANGE		0x0800
+#define RL_CSCFG_STATUS		0xf000
+#define RL_CSCFG_ROW3		0x7000
+#define RL_CSCFG_ROW2		0x3000
+#define RL_CSCFG_ROW1		0x1000
+#define RL_CSCFG_LINK_DOWN_OFF_CMD 0x03c0
+#define RL_CSCFG_LINK_DOWN_CMD	0xf3c0
+
+#define RL_NWAYTST_RESET	0
+#define RL_NWAYTST_CBL_TEST	0x20
+
+#define RL_PARA78		0x78
+#define RL_PARA78_DEF		0x78fa8388
+#define RL_PARA7C		0x7C
+#define RL_PARA7C_DEF		0xcb38de43
+#define RL_PARA7C_RETUNE	0xfb38de03
+/*
  * EEPROM control register
  */
 #define RL_EE_DATAOUT		0x01	/* Data out */
@@ -809,6 +830,10 @@ struct rl_list_data {
 	bus_addr_t		rl_tx_list_addr;
 };
 
+#ifdef RL_TWISTER_ENABLE
+enum rl_twist { DONE, CHK_LINK, FIND_ROW, SET_PARAM, RECHK_LONG, RETUNE };
+#endif
+
 struct rl_softc {
 	struct ifnet		*rl_ifp;	/* interface info */
 	bus_space_handle_t	rl_bhandle;	/* bus space handle */
@@ -837,6 +862,11 @@ struct rl_softc {
 	uint32_t		rl_rxlenmask;
 	int			rl_testmode;
 	int			rl_if_flags;
+#ifdef RL_TWISTER_ENABLE
+	enum rl_twist		rl_twister;
+	int			rl_twist_row;
+	int			rl_twist_col;
+#endif
 	int			suspended;	/* 0 = normal  1 = suspended */
 #ifdef DEVICE_POLLING
 	int			rxcycles;