net: dsa: mv88e6xxx: support 256 databases

The 6185 family of devices has only 256 address databases. Their 8-bit
FID for ATU and VTU operations are split into ATU Control and ATU/VTU
Operation registers.

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

1 files changed, 35 insertions, 1 deletions

diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index f103319dbe14..75a4abc595b1 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -1003,6 +1003,20 @@ static int _mv88e6xxx_atu_cmd(struct dsa_switch *ds, u16 fid, u16 cmd)
                 ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_FID, fid);
                 if (ret < 0)
                         return ret;
+        } else if (mv88e6xxx_num_databases(ds) == 256) {
+                /* ATU DBNum[7:4] are located in ATU Control 15:12 */
+                ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL, GLOBAL_ATU_CONTROL);
+                if (ret < 0)
+                        return ret;
+
+                ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_CONTROL,
+                                           (ret & 0xfff) |
+                                           ((fid << 8) & 0xf000));
+                if (ret < 0)
+                        return ret;
+
+                /* ATU DBNum[3:0] are located in ATU Operation 3:0 */
+                cmd |= fid & 0xf;
         }
 
         ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_OP, cmd);
@@ -1373,6 +1387,17 @@ static int _mv88e6xxx_vtu_getnext(struct dsa_switch *ds,
                                 return ret;
 
                         next.fid = ret & GLOBAL_VTU_FID_MASK;
+                } else if (mv88e6xxx_num_databases(ds) == 256) {
+                        /* VTU DBNum[7:4] are located in VTU Operation 11:8, and
+                         * VTU DBNum[3:0] are located in VTU Operation 3:0
+                         */
+                        ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL,
+                                                  GLOBAL_VTU_OP);
+                        if (ret < 0)
+                                return ret;
+
+                        next.fid = (ret & 0xf00) >> 4;
+                        next.fid |= ret & 0xf;
                 }
 
                 if (mv88e6xxx_has_stu(ds)) {
@@ -1443,6 +1468,7 @@ unlock:
 static int _mv88e6xxx_vtu_loadpurge(struct dsa_switch *ds,
                                     struct mv88e6xxx_vtu_stu_entry *entry)
 {
+        u16 op = GLOBAL_VTU_OP_VTU_LOAD_PURGE;
         u16 reg = 0;
         int ret;
 
@@ -1470,6 +1496,12 @@ static int _mv88e6xxx_vtu_loadpurge(struct dsa_switch *ds,
                 ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_FID, reg);
                 if (ret < 0)
                         return ret;
+        } else if (mv88e6xxx_num_databases(ds) == 256) {
+                /* VTU DBNum[7:4] are located in VTU Operation 11:8, and
+                 * VTU DBNum[3:0] are located in VTU Operation 3:0
+                 */
+                op |= (entry->fid & 0xf0) << 8;
+                op |= entry->fid & 0xf;
         }
 
         reg = GLOBAL_VTU_VID_VALID;
@@ -1479,7 +1511,7 @@ loadpurge:
         if (ret < 0)
                 return ret;
 
-        return _mv88e6xxx_vtu_cmd(ds, GLOBAL_VTU_OP_VTU_LOAD_PURGE);
+        return _mv88e6xxx_vtu_cmd(ds, op);
 }
 
 static int _mv88e6xxx_stu_getnext(struct dsa_switch *ds, u8 sid,
@@ -1564,6 +1596,8 @@ static int _mv88e6xxx_port_fid(struct dsa_switch *ds, int port, u16 *new,
 
         if (mv88e6xxx_num_databases(ds) == 4096)
                 upper_mask = 0xff;
+        else if (mv88e6xxx_num_databases(ds) == 256)
+                upper_mask = 0xf;
         else
                 return -EOPNOTSUPP;