1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * net/dsa/mv88e6060.c - Driver for Marvell 88e6060 switch chips 4 * Copyright (c) 2008-2009 Marvell Semiconductor 5 */ 6 7 #include <linux/delay.h> 8 #include <linux/etherdevice.h> 9 #include <linux/jiffies.h> 10 #include <linux/list.h> 11 #include <linux/module.h> 12 #include <linux/netdevice.h> 13 #include <linux/phy.h> 14 #include <net/dsa.h> 15 #include "mv88e6060.h" 16 17 static int reg_read(struct mv88e6060_priv *priv, int addr, int reg) 18 { 19 return mdiobus_read_nested(priv->bus, priv->sw_addr + addr, reg); 20 } 21 22 static int reg_write(struct mv88e6060_priv *priv, int addr, int reg, u16 val) 23 { 24 return mdiobus_write_nested(priv->bus, priv->sw_addr + addr, reg, val); 25 } 26 27 static const char *mv88e6060_get_name(struct mii_bus *bus, int sw_addr) 28 { 29 int ret; 30 31 ret = mdiobus_read(bus, sw_addr + REG_PORT(0), PORT_SWITCH_ID); 32 if (ret >= 0) { 33 if (ret == PORT_SWITCH_ID_6060) 34 return "Marvell 88E6060 (A0)"; 35 if (ret == PORT_SWITCH_ID_6060_R1 || 36 ret == PORT_SWITCH_ID_6060_R2) 37 return "Marvell 88E6060 (B0)"; 38 if ((ret & PORT_SWITCH_ID_6060_MASK) == PORT_SWITCH_ID_6060) 39 return "Marvell 88E6060"; 40 } 41 42 return NULL; 43 } 44 45 static enum dsa_tag_protocol mv88e6060_get_tag_protocol(struct dsa_switch *ds, 46 int port, 47 enum dsa_tag_protocol m) 48 { 49 return DSA_TAG_PROTO_TRAILER; 50 } 51 52 static int mv88e6060_switch_reset(struct mv88e6060_priv *priv) 53 { 54 int i; 55 int ret; 56 unsigned long timeout; 57 58 /* Set all ports to the disabled state. */ 59 for (i = 0; i < MV88E6060_PORTS; i++) { 60 ret = reg_read(priv, REG_PORT(i), PORT_CONTROL); 61 if (ret < 0) 62 return ret; 63 ret = reg_write(priv, REG_PORT(i), PORT_CONTROL, 64 ret & ~PORT_CONTROL_STATE_MASK); 65 if (ret) 66 return ret; 67 } 68 69 /* Wait for transmit queues to drain. */ 70 usleep_range(2000, 4000); 71 72 /* Reset the switch. */ 73 ret = reg_write(priv, REG_GLOBAL, GLOBAL_ATU_CONTROL, 74 GLOBAL_ATU_CONTROL_SWRESET | 75 GLOBAL_ATU_CONTROL_LEARNDIS); 76 if (ret) 77 return ret; 78 79 /* Wait up to one second for reset to complete. */ 80 timeout = jiffies + 1 * HZ; 81 while (time_before(jiffies, timeout)) { 82 ret = reg_read(priv, REG_GLOBAL, GLOBAL_STATUS); 83 if (ret < 0) 84 return ret; 85 86 if (ret & GLOBAL_STATUS_INIT_READY) 87 break; 88 89 usleep_range(1000, 2000); 90 } 91 if (time_after(jiffies, timeout)) 92 return -ETIMEDOUT; 93 94 return 0; 95 } 96 97 static int mv88e6060_setup_global(struct mv88e6060_priv *priv) 98 { 99 int ret; 100 101 /* Disable discarding of frames with excessive collisions, 102 * set the maximum frame size to 1536 bytes, and mask all 103 * interrupt sources. 104 */ 105 ret = reg_write(priv, REG_GLOBAL, GLOBAL_CONTROL, 106 GLOBAL_CONTROL_MAX_FRAME_1536); 107 if (ret) 108 return ret; 109 110 /* Disable automatic address learning. 111 */ 112 return reg_write(priv, REG_GLOBAL, GLOBAL_ATU_CONTROL, 113 GLOBAL_ATU_CONTROL_LEARNDIS); 114 } 115 116 static int mv88e6060_setup_port(struct mv88e6060_priv *priv, int p) 117 { 118 int addr = REG_PORT(p); 119 int ret; 120 121 if (dsa_is_unused_port(priv->ds, p)) 122 return 0; 123 124 /* Do not force flow control, disable Ingress and Egress 125 * Header tagging, disable VLAN tunneling, and set the port 126 * state to Forwarding. Additionally, if this is the CPU 127 * port, enable Ingress and Egress Trailer tagging mode. 128 */ 129 ret = reg_write(priv, addr, PORT_CONTROL, 130 dsa_is_cpu_port(priv->ds, p) ? 131 PORT_CONTROL_TRAILER | 132 PORT_CONTROL_INGRESS_MODE | 133 PORT_CONTROL_STATE_FORWARDING : 134 PORT_CONTROL_STATE_FORWARDING); 135 if (ret) 136 return ret; 137 138 /* Port based VLAN map: give each port its own address 139 * database, allow the CPU port to talk to each of the 'real' 140 * ports, and allow each of the 'real' ports to only talk to 141 * the CPU port. 142 */ 143 ret = reg_write(priv, addr, PORT_VLAN_MAP, 144 ((p & 0xf) << PORT_VLAN_MAP_DBNUM_SHIFT) | 145 (dsa_is_cpu_port(priv->ds, p) ? 146 dsa_user_ports(priv->ds) : 147 BIT(dsa_to_port(priv->ds, p)->cpu_dp->index))); 148 if (ret) 149 return ret; 150 151 /* Port Association Vector: when learning source addresses 152 * of packets, add the address to the address database using 153 * a port bitmap that has only the bit for this port set and 154 * the other bits clear. 155 */ 156 return reg_write(priv, addr, PORT_ASSOC_VECTOR, BIT(p)); 157 } 158 159 static int mv88e6060_setup_addr(struct mv88e6060_priv *priv) 160 { 161 u8 addr[ETH_ALEN]; 162 int ret; 163 u16 val; 164 165 eth_random_addr(addr); 166 167 val = addr[0] << 8 | addr[1]; 168 169 /* The multicast bit is always transmitted as a zero, so the switch uses 170 * bit 8 for "DiffAddr", where 0 means all ports transmit the same SA. 171 */ 172 val &= 0xfeff; 173 174 ret = reg_write(priv, REG_GLOBAL, GLOBAL_MAC_01, val); 175 if (ret) 176 return ret; 177 178 ret = reg_write(priv, REG_GLOBAL, GLOBAL_MAC_23, 179 (addr[2] << 8) | addr[3]); 180 if (ret) 181 return ret; 182 183 return reg_write(priv, REG_GLOBAL, GLOBAL_MAC_45, 184 (addr[4] << 8) | addr[5]); 185 } 186 187 static int mv88e6060_setup(struct dsa_switch *ds) 188 { 189 struct mv88e6060_priv *priv = ds->priv; 190 int ret; 191 int i; 192 193 priv->ds = ds; 194 195 ret = mv88e6060_switch_reset(priv); 196 if (ret < 0) 197 return ret; 198 199 /* @@@ initialise atu */ 200 201 ret = mv88e6060_setup_global(priv); 202 if (ret < 0) 203 return ret; 204 205 ret = mv88e6060_setup_addr(priv); 206 if (ret < 0) 207 return ret; 208 209 for (i = 0; i < MV88E6060_PORTS; i++) { 210 ret = mv88e6060_setup_port(priv, i); 211 if (ret < 0) 212 return ret; 213 } 214 215 return 0; 216 } 217 218 static int mv88e6060_port_to_phy_addr(int port) 219 { 220 if (port >= 0 && port < MV88E6060_PORTS) 221 return port; 222 return -1; 223 } 224 225 static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum) 226 { 227 struct mv88e6060_priv *priv = ds->priv; 228 int addr; 229 230 addr = mv88e6060_port_to_phy_addr(port); 231 if (addr == -1) 232 return 0xffff; 233 234 return reg_read(priv, addr, regnum); 235 } 236 237 static int 238 mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val) 239 { 240 struct mv88e6060_priv *priv = ds->priv; 241 int addr; 242 243 addr = mv88e6060_port_to_phy_addr(port); 244 if (addr == -1) 245 return 0xffff; 246 247 return reg_write(priv, addr, regnum, val); 248 } 249 250 static const struct dsa_switch_ops mv88e6060_switch_ops = { 251 .get_tag_protocol = mv88e6060_get_tag_protocol, 252 .setup = mv88e6060_setup, 253 .phy_read = mv88e6060_phy_read, 254 .phy_write = mv88e6060_phy_write, 255 }; 256 257 static int mv88e6060_probe(struct mdio_device *mdiodev) 258 { 259 struct device *dev = &mdiodev->dev; 260 struct mv88e6060_priv *priv; 261 struct dsa_switch *ds; 262 const char *name; 263 264 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 265 if (!priv) 266 return -ENOMEM; 267 268 priv->bus = mdiodev->bus; 269 priv->sw_addr = mdiodev->addr; 270 271 name = mv88e6060_get_name(priv->bus, priv->sw_addr); 272 if (!name) 273 return -ENODEV; 274 275 dev_info(dev, "switch %s detected\n", name); 276 277 ds = devm_kzalloc(dev, sizeof(*ds), GFP_KERNEL); 278 if (!ds) 279 return -ENOMEM; 280 281 ds->dev = dev; 282 ds->num_ports = MV88E6060_PORTS; 283 ds->priv = priv; 284 ds->dev = dev; 285 ds->ops = &mv88e6060_switch_ops; 286 287 dev_set_drvdata(dev, ds); 288 289 return dsa_register_switch(ds); 290 } 291 292 static void mv88e6060_remove(struct mdio_device *mdiodev) 293 { 294 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev); 295 296 if (!ds) 297 return; 298 299 dsa_unregister_switch(ds); 300 } 301 302 static void mv88e6060_shutdown(struct mdio_device *mdiodev) 303 { 304 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev); 305 306 if (!ds) 307 return; 308 309 dsa_switch_shutdown(ds); 310 311 dev_set_drvdata(&mdiodev->dev, NULL); 312 } 313 314 static const struct of_device_id mv88e6060_of_match[] = { 315 { 316 .compatible = "marvell,mv88e6060", 317 }, 318 { /* sentinel */ }, 319 }; 320 321 static struct mdio_driver mv88e6060_driver = { 322 .probe = mv88e6060_probe, 323 .remove = mv88e6060_remove, 324 .shutdown = mv88e6060_shutdown, 325 .mdiodrv.driver = { 326 .name = "mv88e6060", 327 .of_match_table = mv88e6060_of_match, 328 }, 329 }; 330 331 mdio_module_driver(mv88e6060_driver); 332 333 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>"); 334 MODULE_DESCRIPTION("Driver for Marvell 88E6060 ethernet switch chip"); 335 MODULE_LICENSE("GPL"); 336 MODULE_ALIAS("platform:mv88e6060"); 337