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net: dsa: rtl8366rb: Support port 4 (WAN) 

The totally undocumented IO mode needs to be set to enumerator
0 to enable port 4 also known as WAN in most configurations,
for ordinary traffic. The 3 bits in the register come up as
010 after reset, but need to be set to 000.

The Realtek source code contains a name for these bits, but
no explanation of what the 8 different IO modes may be.

Set it to zero for the time being and drop a comment so
people know what is going on if they run into trouble. This
"mode zero" works fine with the D-Link DIR-685 with
RTL8366RB.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Linus Walleij 2018-08-08 14:38:55 +02:00 committed by David S. Miller
parent cd16e5b233
commit 933de7866b
1 changed files with 30 additions and 0 deletions
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30
drivers/net/dsa/rtl8366rb.c
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@ -48,6 +48,23 @@
#define RTL8366RB_SSCR2 0x0004
#define RTL8366RB_SSCR2_DROP_UNKNOWN_DA BIT(0)
/* Port Mode Control registers */
#define RTL8366RB_PMC0 0x0005
#define RTL8366RB_PMC0_SPI BIT(0)
#define RTL8366RB_PMC0_EN_AUTOLOAD BIT(1)
#define RTL8366RB_PMC0_PROBE BIT(2)
#define RTL8366RB_PMC0_DIS_BISR BIT(3)
#define RTL8366RB_PMC0_ADCTEST BIT(4)
#define RTL8366RB_PMC0_SRAM_DIAG BIT(5)
#define RTL8366RB_PMC0_EN_SCAN BIT(6)
#define RTL8366RB_PMC0_P4_IOMODE_SHIFT 7
#define RTL8366RB_PMC0_P4_IOMODE_MASK GENMASK(9, 7)
#define RTL8366RB_PMC0_P5_IOMODE_SHIFT 10
#define RTL8366RB_PMC0_P5_IOMODE_MASK GENMASK(12, 10)
#define RTL8366RB_PMC0_SDSMODE_SHIFT 13
#define RTL8366RB_PMC0_SDSMODE_MASK GENMASK(15, 13)
#define RTL8366RB_PMC1 0x0006
/* Port Mirror Control Register */
#define RTL8366RB_PMCR 0x0007
#define RTL8366RB_PMCR_SOURCE_PORT(a) (a)
@ -860,6 +877,19 @@ static int rtl8366rb_setup(struct dsa_switch *ds)
if (ret)
return ret;
/* Port 4 setup: this enables Port 4, usually the WAN port,
* common PHY IO mode is apparently mode 0, and this is not what
* the port is initialized to. There is no explanation of the
* IO modes in the Realtek source code, if your WAN port is
* connected to something exotic such as fiber, then this might
* be worth experimenting with.
*/
ret = regmap_update_bits(smi->map, RTL8366RB_PMC0,
RTL8366RB_PMC0_P4_IOMODE_MASK,
0 << RTL8366RB_PMC0_P4_IOMODE_SHIFT);
if (ret)
return ret;
/* Discard VLAN tagged packets if the port is not a member of
* the VLAN with which the packets is associated.
*/