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net: dsa: mv88e6xxx: add mv88e6352_g2_scratch_port_has_serdes()

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Read the hardware configuration to determine which port is attached
to the serdes.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King (Oracle) 2022-02-03 13:30:36 +00:00 committed by David S. Miller
parent 0947644332
commit 62001548a6
2 changed files with 31 additions and 0 deletions
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3
drivers/net/dsa/mv88e6xxx/global2.h
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@ -299,6 +299,8 @@
#define MV88E6352_G2_SCRATCH_CONFIG_DATA1_NO_CPU BIT(2)
#define MV88E6352_G2_SCRATCH_CONFIG_DATA2 0x72
#define MV88E6352_G2_SCRATCH_CONFIG_DATA2_P0_MODE_MASK 0x3
#define MV88E6352_G2_SCRATCH_CONFIG_DATA3 0x73
#define MV88E6352_G2_SCRATCH_CONFIG_DATA3_S_SEL BIT(1)
#define MV88E6352_G2_SCRATCH_GPIO_PCTL_GPIO 0
#define MV88E6352_G2_SCRATCH_GPIO_PCTL_TRIG 1
@ -370,6 +372,7 @@ extern const struct mv88e6xxx_gpio_ops mv88e6352_gpio_ops;
int mv88e6xxx_g2_scratch_gpio_set_smi(struct mv88e6xxx_chip *chip,
bool external);
int mv88e6352_g2_scratch_port_has_serdes(struct mv88e6xxx_chip *chip, int port);
int mv88e6xxx_g2_atu_stats_set(struct mv88e6xxx_chip *chip, u16 kind, u16 bin);
int mv88e6xxx_g2_atu_stats_get(struct mv88e6xxx_chip *chip, u16 *stats);

28
drivers/net/dsa/mv88e6xxx/global2_scratch.c
View File

@ -289,3 +289,31 @@ int mv88e6xxx_g2_scratch_gpio_set_smi(struct mv88e6xxx_chip *chip,
return mv88e6xxx_g2_scratch_write(chip, misc_cfg, val);
}
/**
* mv88e6352_g2_scratch_port_has_serdes - indicate if a port can have a serdes
* @chip: chip private data
* @port: port number to check for serdes
*
* Indicates whether the port may have a serdes attached according to the
* pin strapping. Returns negative error number, 0 if the port is not
* configured to have a serdes, and 1 if the port is configured to have a
* serdes attached.
*/
int mv88e6352_g2_scratch_port_has_serdes(struct mv88e6xxx_chip *chip, int port)
{
u8 config3, p;
int err;
err = mv88e6xxx_g2_scratch_read(chip, MV88E6352_G2_SCRATCH_CONFIG_DATA3,
&config3);
if (err)
return err;
if (config3 & MV88E6352_G2_SCRATCH_CONFIG_DATA3_S_SEL)
p = 5;
else
p = 4;
return port == p;
}