1/* 2 * net/dsa/mv88e6060.c - Driver for Marvell 88e6060 switch chips 3 * Copyright (c) 2008-2009 Marvell Semiconductor 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 */ 10 11#include <linux/list.h> 12#include <linux/netdevice.h> 13#include <linux/phy.h> 14#include "dsa_priv.h" 15 16#define REG_PORT(p) (8 + (p)) 17#define REG_GLOBAL 0x0f 18 19static int reg_read(struct dsa_switch *ds, int addr, int reg) 20{ 21 return mdiobus_read(ds->master_mii_bus, addr, reg); 22} 23 24#define REG_READ(addr, reg) \ 25 ({ \ 26 int __ret; \ 27 \ 28 __ret = reg_read(ds, addr, reg); \ 29 if (__ret < 0) \ 30 return __ret; \ 31 __ret; \ 32 }) 33 34 35static int reg_write(struct dsa_switch *ds, int addr, int reg, u16 val) 36{ 37 return mdiobus_write(ds->master_mii_bus, addr, reg, val); 38} 39 40#define REG_WRITE(addr, reg, val) \ 41 ({ \ 42 int __ret; \ 43 \ 44 __ret = reg_write(ds, addr, reg, val); \ 45 if (__ret < 0) \ 46 return __ret; \ 47 }) 48 49static char *mv88e6060_probe(struct mii_bus *bus, int sw_addr) 50{ 51 int ret; 52 53 ret = mdiobus_read(bus, REG_PORT(0), 0x03); 54 if (ret >= 0) { 55 ret &= 0xfff0; 56 if (ret == 0x0600) 57 return "Marvell 88E6060"; 58 } 59 60 return NULL; 61} 62 63static int mv88e6060_switch_reset(struct dsa_switch *ds) 64{ 65 int i; 66 int ret; 67 68 /* 69 * Set all ports to the disabled state. 70 */ 71 for (i = 0; i < 6; i++) { 72 ret = REG_READ(REG_PORT(i), 0x04); 73 REG_WRITE(REG_PORT(i), 0x04, ret & 0xfffc); 74 } 75 76 /* 77 * Wait for transmit queues to drain. 78 */ 79 msleep(2); 80 81 /* 82 * Reset the switch. 83 */ 84 REG_WRITE(REG_GLOBAL, 0x0a, 0xa130); 85 86 /* 87 * Wait up to one second for reset to complete. 88 */ 89 for (i = 0; i < 1000; i++) { 90 ret = REG_READ(REG_GLOBAL, 0x00); 91 if ((ret & 0x8000) == 0x0000) 92 break; 93 94 msleep(1); 95 } 96 if (i == 1000) 97 return -ETIMEDOUT; 98 99 return 0; 100} 101 102static int mv88e6060_setup_global(struct dsa_switch *ds) 103{ 104 /* 105 * Disable discarding of frames with excessive collisions, 106 * set the maximum frame size to 1536 bytes, and mask all 107 * interrupt sources. 108 */ 109 REG_WRITE(REG_GLOBAL, 0x04, 0x0800); 110 111 /* 112 * Enable automatic address learning, set the address 113 * database size to 1024 entries, and set the default aging 114 * time to 5 minutes. 115 */ 116 REG_WRITE(REG_GLOBAL, 0x0a, 0x2130); 117 118 return 0; 119} 120 121static int mv88e6060_setup_port(struct dsa_switch *ds, int p) 122{ 123 int addr = REG_PORT(p); 124 125 /* 126 * Do not force flow control, disable Ingress and Egress 127 * Header tagging, disable VLAN tunneling, and set the port 128 * state to Forwarding. Additionally, if this is the CPU 129 * port, enable Ingress and Egress Trailer tagging mode. 130 */ 131 REG_WRITE(addr, 0x04, dsa_is_cpu_port(ds, p) ? 0x4103 : 0x0003); 132 133 /* 134 * Port based VLAN map: give each port its own address 135 * database, allow the CPU port to talk to each of the 'real' 136 * ports, and allow each of the 'real' ports to only talk to 137 * the CPU port. 138 */ 139 REG_WRITE(addr, 0x06, 140 ((p & 0xf) << 12) | 141 (dsa_is_cpu_port(ds, p) ? 142 ds->phys_port_mask : 143 (1 << ds->dst->cpu_port))); 144 145 /* 146 * Port Association Vector: when learning source addresses 147 * of packets, add the address to the address database using 148 * a port bitmap that has only the bit for this port set and 149 * the other bits clear. 150 */ 151 REG_WRITE(addr, 0x0b, 1 << p); 152 153 return 0; 154} 155 156static int mv88e6060_setup(struct dsa_switch *ds) 157{ 158 int i; 159 int ret; 160 161 ret = mv88e6060_switch_reset(ds); 162 if (ret < 0) 163 return ret; 164 165 /* @@@ initialise atu */ 166 167 ret = mv88e6060_setup_global(ds); 168 if (ret < 0) 169 return ret; 170 171 for (i = 0; i < 6; i++) { 172 ret = mv88e6060_setup_port(ds, i); 173 if (ret < 0) 174 return ret; 175 } 176 177 return 0; 178} 179 180static int mv88e6060_set_addr(struct dsa_switch *ds, u8 *addr) 181{ 182 REG_WRITE(REG_GLOBAL, 0x01, (addr[0] << 8) | addr[1]); 183 REG_WRITE(REG_GLOBAL, 0x02, (addr[2] << 8) | addr[3]); 184 REG_WRITE(REG_GLOBAL, 0x03, (addr[4] << 8) | addr[5]); 185 186 return 0; 187} 188 189static int mv88e6060_port_to_phy_addr(int port) 190{ 191 if (port >= 0 && port <= 5) 192 return port; 193 return -1; 194} 195 196static int mv88e6060_phy_read(struct dsa_switch *ds, int port, int regnum) 197{ 198 int addr; 199 200 addr = mv88e6060_port_to_phy_addr(port); 201 if (addr == -1) 202 return 0xffff; 203 204 return reg_read(ds, addr, regnum); 205} 206 207static int 208mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val) 209{ 210 int addr; 211 212 addr = mv88e6060_port_to_phy_addr(port); 213 if (addr == -1) 214 return 0xffff; 215 216 return reg_write(ds, addr, regnum, val); 217} 218 219static void mv88e6060_poll_link(struct dsa_switch *ds) 220{ 221 int i; 222 223 for (i = 0; i < DSA_MAX_PORTS; i++) { 224 struct net_device *dev; 225 int uninitialized_var(port_status); 226 int link; 227 int speed; 228 int duplex; 229 int fc; 230 231 dev = ds->ports[i]; 232 if (dev == NULL) 233 continue; 234 235 link = 0; 236 if (dev->flags & IFF_UP) { 237 port_status = reg_read(ds, REG_PORT(i), 0x00); 238 if (port_status < 0) 239 continue; 240 241 link = !!(port_status & 0x1000); 242 } 243 244 if (!link) { 245 if (netif_carrier_ok(dev)) { 246 printk(KERN_INFO "%s: link down\n", dev->name); 247 netif_carrier_off(dev); 248 } 249 continue; 250 } 251 252 speed = (port_status & 0x0100) ? 100 : 10; 253 duplex = (port_status & 0x0200) ? 1 : 0; 254 fc = ((port_status & 0xc000) == 0xc000) ? 1 : 0; 255 256 if (!netif_carrier_ok(dev)) { 257 printk(KERN_INFO "%s: link up, %d Mb/s, %s duplex, " 258 "flow control %sabled\n", dev->name, 259 speed, duplex ? "full" : "half", 260 fc ? "en" : "dis"); 261 netif_carrier_on(dev); 262 } 263 } 264} 265 266static struct dsa_switch_driver mv88e6060_switch_driver = { 267 .tag_protocol = htons(ETH_P_TRAILER), 268 .probe = mv88e6060_probe, 269 .setup = mv88e6060_setup, 270 .set_addr = mv88e6060_set_addr, 271 .phy_read = mv88e6060_phy_read, 272 .phy_write = mv88e6060_phy_write, 273 .poll_link = mv88e6060_poll_link, 274}; 275 276static int __init mv88e6060_init(void) 277{ 278 register_switch_driver(&mv88e6060_switch_driver); 279 return 0; 280} 281module_init(mv88e6060_init); 282 283static void __exit mv88e6060_cleanup(void) 284{ 285 unregister_switch_driver(&mv88e6060_switch_driver); 286} 287module_exit(mv88e6060_cleanup); 288