net: dsa: mv88x6xxx: mv88e6390 errata

[ Upstream commit ea89098ef9a574bceca00d3b5df14aaf0b3f9ccf ]

The 6390 copper ports have an errata which require poking magic values
into undocumented magic registers and then performing a software
reset.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index eebda5e..34998ec 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1979,6 +1979,107 @@ static int mv88e6xxx_g1_setup(struct mv88e6xxx_chip *chip)
        return 0;
 }
 
+/* The mv88e6390 has some hidden registers used for debug and
+ * development. The errata also makes use of them.
+ */
+static int mv88e6390_hidden_write(struct mv88e6xxx_chip *chip, int port,
+                                 int reg, u16 val)
+{
+       u16 ctrl;
+       int err;
+
+       err = mv88e6xxx_port_write(chip, PORT_RESERVED_1A_DATA_PORT,
+                                  PORT_RESERVED_1A, val);
+       if (err)
+               return err;
+
+       ctrl = PORT_RESERVED_1A_BUSY | PORT_RESERVED_1A_WRITE |
+              PORT_RESERVED_1A_BLOCK | port << PORT_RESERVED_1A_PORT_SHIFT |
+              reg;
+
+       return mv88e6xxx_port_write(chip, PORT_RESERVED_1A_CTRL_PORT,
+                                   PORT_RESERVED_1A, ctrl);
+}
+
+static int mv88e6390_hidden_wait(struct mv88e6xxx_chip *chip)
+{
+       return mv88e6xxx_wait(chip, PORT_RESERVED_1A_CTRL_PORT,
+                             PORT_RESERVED_1A, PORT_RESERVED_1A_BUSY);
+}
+
+
+static int mv88e6390_hidden_read(struct mv88e6xxx_chip *chip, int port,
+                                 int reg, u16 *val)
+{
+       u16 ctrl;
+       int err;
+
+       ctrl = PORT_RESERVED_1A_BUSY | PORT_RESERVED_1A_READ |
+              PORT_RESERVED_1A_BLOCK | port << PORT_RESERVED_1A_PORT_SHIFT |
+              reg;
+
+       err = mv88e6xxx_port_write(chip, PORT_RESERVED_1A_CTRL_PORT,
+                                  PORT_RESERVED_1A, ctrl);
+       if (err)
+               return err;
+
+       err = mv88e6390_hidden_wait(chip);
+       if (err)
+               return err;
+
+       return  mv88e6xxx_port_read(chip, PORT_RESERVED_1A_DATA_PORT,
+                                   PORT_RESERVED_1A, val);
+}
+
+/* Check if the errata has already been applied. */
+static bool mv88e6390_setup_errata_applied(struct mv88e6xxx_chip *chip)
+{
+       int port;
+       int err;
+       u16 val;
+
+       for (port = 0; port < mv88e6xxx_num_ports(chip); port++) {
+               err = mv88e6390_hidden_read(chip, port, 0, &val);
+               if (err) {
+                       dev_err(chip->dev,
+                               "Error reading hidden register: %d\n", err);
+                       return false;
+               }
+               if (val != 0x01c0)
+                       return false;
+       }
+
+       return true;
+}
+
+/* The 6390 copper ports have an errata which require poking magic
+ * values into undocumented hidden registers and then performing a
+ * software reset.
+ */
+static int mv88e6390_setup_errata(struct mv88e6xxx_chip *chip)
+{
+       int port;
+       int err;
+
+       if (mv88e6390_setup_errata_applied(chip))
+               return 0;
+
+       /* Set the ports into blocking mode */
+       for (port = 0; port < mv88e6xxx_num_ports(chip); port++) {
+               err = mv88e6xxx_port_set_state(chip, port, BR_STATE_DISABLED);
+               if (err)
+                       return err;
+       }
+
+       for (port = 0; port < mv88e6xxx_num_ports(chip); port++) {
+               err = mv88e6390_hidden_write(chip, port, 0, 0x01c0);
+               if (err)
+                       return err;
+       }
+
+       return mv88e6xxx_software_reset(chip);
+}
+
 static int mv88e6xxx_setup(struct dsa_switch *ds)
 {
        struct mv88e6xxx_chip *chip = ds->priv;
@@ -1990,6 +2091,12 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
 
        mutex_lock(&chip->reg_lock);
 
+       if (chip->info->ops->setup_errata) {
+               err = chip->info->ops->setup_errata(chip);
+               if (err)
+                       goto unlock;
+       }
+
        /* Setup Switch Port Registers */
        for (i = 0; i < mv88e6xxx_num_ports(chip); i++) {
                err = mv88e6xxx_setup_port(chip, i);
@@ -2652,6 +2759,7 @@ static const struct mv88e6xxx_ops mv88e6185_ops = {
 
 static const struct mv88e6xxx_ops mv88e6190_ops = {
        /* MV88E6XXX_FAMILY_6390 */
+       .setup_errata = mv88e6390_setup_errata,
        .irl_init_all = mv88e6390_g2_irl_init_all,
        .get_eeprom = mv88e6xxx_g2_get_eeprom8,
        .set_eeprom = mv88e6xxx_g2_set_eeprom8,
@@ -2687,6 +2795,7 @@ static const struct mv88e6xxx_ops mv88e6190_ops = {
 
 static const struct mv88e6xxx_ops mv88e6190x_ops = {
        /* MV88E6XXX_FAMILY_6390 */
+       .setup_errata = mv88e6390_setup_errata,
        .irl_init_all = mv88e6390_g2_irl_init_all,
        .get_eeprom = mv88e6xxx_g2_get_eeprom8,
        .set_eeprom = mv88e6xxx_g2_set_eeprom8,
@@ -2722,6 +2831,7 @@ static const struct mv88e6xxx_ops mv88e6190x_ops = {
 
 static const struct mv88e6xxx_ops mv88e6191_ops = {
        /* MV88E6XXX_FAMILY_6390 */
+       .setup_errata = mv88e6390_setup_errata,
        .irl_init_all = mv88e6390_g2_irl_init_all,
        .get_eeprom = mv88e6xxx_g2_get_eeprom8,
        .set_eeprom = mv88e6xxx_g2_set_eeprom8,
@@ -2793,6 +2903,7 @@ static const struct mv88e6xxx_ops mv88e6240_ops = {
 
 static const struct mv88e6xxx_ops mv88e6290_ops = {
        /* MV88E6XXX_FAMILY_6390 */
+       .setup_errata = mv88e6390_setup_errata,
        .irl_init_all = mv88e6390_g2_irl_init_all,
        .get_eeprom = mv88e6xxx_g2_get_eeprom8,
        .set_eeprom = mv88e6xxx_g2_set_eeprom8,
@@ -3030,6 +3141,7 @@ static const struct mv88e6xxx_ops mv88e6352_ops = {
 
 static const struct mv88e6xxx_ops mv88e6390_ops = {
        /* MV88E6XXX_FAMILY_6390 */
+       .setup_errata = mv88e6390_setup_errata,
        .irl_init_all = mv88e6390_g2_irl_init_all,
        .get_eeprom = mv88e6xxx_g2_get_eeprom8,
        .set_eeprom = mv88e6xxx_g2_set_eeprom8,
@@ -3068,6 +3180,7 @@ static const struct mv88e6xxx_ops mv88e6390_ops = {
 
 static const struct mv88e6xxx_ops mv88e6390x_ops = {
        /* MV88E6XXX_FAMILY_6390 */
+       .setup_errata = mv88e6390_setup_errata,
        .irl_init_all = mv88e6390_g2_irl_init_all,
        .get_eeprom = mv88e6xxx_g2_get_eeprom8,
        .set_eeprom = mv88e6xxx_g2_set_eeprom8,

diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index 334f6f7..0913eec 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -222,6 +222,11 @@ struct mv88e6xxx_mdio_bus {
 };
 
 struct mv88e6xxx_ops {
+       /* Switch Setup Errata, called early in the switch setup to
+        * allow any errata actions to be performed
+        */
+       int (*setup_errata)(struct mv88e6xxx_chip *chip);
+
        /* Ingress Rate Limit unit (IRL) operations */
        int (*irl_init_all)(struct mv88e6xxx_chip *chip, int port);
 

diff --git a/drivers/net/dsa/mv88e6xxx/port.h b/drivers/net/dsa/mv88e6xxx/port.h
index b16d5f0..ccdc67f 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/port.h
+++ b/drivers/net/dsa/mv88e6xxx/port.h
@@ -236,6 +236,16 @@
 /* Offset 0x19: Port IEEE Priority Remapping Registers (4-7) */
 #define MV88E6095_PORT_IEEE_PRIO_REMAP_4567    0x19
 
+/* Offset 0x1a: Magic undocumented errata register */
+#define PORT_RESERVED_1A                       0x1a
+#define PORT_RESERVED_1A_BUSY                  BIT(15)
+#define PORT_RESERVED_1A_WRITE                 BIT(14)
+#define PORT_RESERVED_1A_READ                  0
+#define PORT_RESERVED_1A_PORT_SHIFT            5
+#define PORT_RESERVED_1A_BLOCK                 (0xf << 10)
+#define PORT_RESERVED_1A_CTRL_PORT             4
+#define PORT_RESERVED_1A_DATA_PORT             5
+
 int mv88e6xxx_port_read(struct mv88e6xxx_chip *chip, int port, int reg,
                        u16 *val);
 int mv88e6xxx_port_write(struct mv88e6xxx_chip *chip, int port, int reg,