net: dsa: mv88e6xxx: make global2 code optional

Since not every chip has a Global2 set of registers, make its support
optional, in which case the related functions will return -EOPNOTSUPP.

This also allows to reduce the size of the mv88e6xxx driver for devices
such as home routers embedding Ethernet chips without Global2 support.

It is present on most recent chips, thus enable its support by default.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/mv88e6xxx/Kconfig b/drivers/net/dsa/mv88e6xxx/Kconfig
index ac77737bbd872b4782b8d7e889c069964491e15f..486668813e15eba3a8972919a27cc1b89bce02b7 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/Kconfig
+++ b/drivers/net/dsa/mv88e6xxx/Kconfig
@@ -6,3 +6,14 @@ config NET_DSA_MV88E6XXX
        help
          This driver adds support for most of the Marvell 88E6xxx models of
          Ethernet switch chips, except 88E6060.
+
+config NET_DSA_MV88E6XXX_GLOBAL2
+       bool "Switch Global 2 Registers support"
+       default y
+       depends on NET_DSA_MV88E6XXX
+       help
+         This registers set at internal SMI address 0x1C provides extended
+         features like EEPROM interface, trunking, cross-chip setup, etc.
+
+         It is required on most chips. If the chip you compile the support for
+         doesn't have such registers set, say N here. In doubt, say Y.

diff --git a/drivers/net/dsa/mv88e6xxx/Makefile b/drivers/net/dsa/mv88e6xxx/Makefile
index 5a4206652e92d847a851018c97ec1845f34b671e..6971039343179fcb0adfe344c67b976bc6267ead 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/Makefile
+++ b/drivers/net/dsa/mv88e6xxx/Makefile
@@ -1,3 +1,3 @@
 obj-$(CONFIG_NET_DSA_MV88E6XXX) += mv88e6xxx.o
 mv88e6xxx-objs := chip.o
-mv88e6xxx-objs += global2.o
+mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_GLOBAL2) += global2.o

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 745e1588d83c362112756d9dc06dadde490c0946..70a812d159c9302571b08baf4561b9623dc4ac23 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -3444,6 +3444,10 @@ static int mv88e6xxx_detect(struct mv88e6xxx_chip *chip)
        /* Update the compatible info with the probed one */
        chip->info = info;
 
+       err = mv88e6xxx_g2_require(chip);
+       if (err)
+               return err;
+
        dev_info(chip->dev, "switch 0x%x detected: %s, revision %u\n",
                 chip->info->prod_num, chip->info->name, rev);
 

diff --git a/drivers/net/dsa/mv88e6xxx/global2.h b/drivers/net/dsa/mv88e6xxx/global2.h
index bee1bc98fd97a816aac1020d0f4b2d88ad1f1a67..c4bb9035ee3adc291ae140920147ed0e635575e1 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/global2.h
+++ b/drivers/net/dsa/mv88e6xxx/global2.h
@@ -16,6 +16,13 @@
 
 #include "mv88e6xxx.h"
 
+#ifdef CONFIG_NET_DSA_MV88E6XXX_GLOBAL2
+
+static inline int mv88e6xxx_g2_require(struct mv88e6xxx_chip *chip)
+{
+       return 0;
+}
+
 int mv88e6xxx_g2_smi_phy_read(struct mv88e6xxx_chip *chip, int addr, int reg,
                              u16 *val);
 int mv88e6xxx_g2_smi_phy_write(struct mv88e6xxx_chip *chip, int addr, int reg,
@@ -27,4 +34,55 @@ int mv88e6xxx_g2_set_eeprom16(struct mv88e6xxx_chip *chip,
                              struct ethtool_eeprom *eeprom, u8 *data);
 int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip);
 
+#else /* !CONFIG_NET_DSA_MV88E6XXX_GLOBAL2 */
+
+static inline int mv88e6xxx_g2_require(struct mv88e6xxx_chip *chip)
+{
+       if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_GLOBAL2)) {
+               dev_err(chip->dev, "this chip requires CONFIG_NET_DSA_MV88E6XXX_GLOBAL2 enabled\n");
+               return -EOPNOTSUPP;
+       }
+
+       return 0;
+}
+
+static inline int mv88e6xxx_g2_smi_phy_read(struct mv88e6xxx_chip *chip,
+                                           int addr, int reg, u16 *val)
+{
+       return -EOPNOTSUPP;
+}
+
+static inline int mv88e6xxx_g2_smi_phy_write(struct mv88e6xxx_chip *chip,
+                                            int addr, int reg, u16 val)
+{
+       return -EOPNOTSUPP;
+}
+
+static inline int mv88e6xxx_g2_set_switch_mac(struct mv88e6xxx_chip *chip,
+                                             u8 *addr)
+{
+       return -EOPNOTSUPP;
+}
+
+static inline int mv88e6xxx_g2_get_eeprom16(struct mv88e6xxx_chip *chip,
+                                           struct ethtool_eeprom *eeprom,
+                                           u8 *data)
+{
+       return -EOPNOTSUPP;
+}
+
+static inline int mv88e6xxx_g2_set_eeprom16(struct mv88e6xxx_chip *chip,
+                                           struct ethtool_eeprom *eeprom,
+                                           u8 *data)
+{
+       return -EOPNOTSUPP;
+}
+
+static inline int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip)
+{
+       return -EOPNOTSUPP;
+}
+
+#endif /* CONFIG_NET_DSA_MV88E6XXX_GLOBAL2 */
+
 #endif /* _MV88E6XXX_GLOBAL2_H */