drivers/net/ixp2000/pm3386.c

   1 /*
   2  * Helper functions for the PM3386s on the Radisys ENP2611
   3  * Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org>
   4  * Dedicated to Marija Kulikova.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/module.h>
  14 #include <linux/delay.h>
  15 #include <linux/netdevice.h>
  16 #include <asm/io.h>
  17 #include "pm3386.h"
  18
  19 /*
  20  * Read from register 'reg' of PM3386 device 'pm'.
  21  */
  22 static u16 pm3386_reg_read(int pm, int reg)
  23 {
  24         void *_reg;
  25         u16 value;
  26
  27         _reg = (void *)ENP2611_PM3386_0_VIRT_BASE;
  28         if (pm == 1)
  29                 _reg = (void *)ENP2611_PM3386_1_VIRT_BASE;
  30
  31         value = *((volatile u16 *)(_reg + (reg << 1)));
  32
  33 //      printk(KERN_INFO "pm3386_reg_read(%d, %.3x) = %.8x\n", pm, reg, value);
  34
  35         return value;
  36 }
  37
  38 /*
  39  * Write to register 'reg' of PM3386 device 'pm', and perform
  40  * a readback from the identification register.
  41  */
  42 static void pm3386_reg_write(int pm, int reg, u16 value)
  43 {
  44         void *_reg;
  45         u16 dummy;
  46
  47 //      printk(KERN_INFO "pm3386_reg_write(%d, %.3x, %.8x)\n", pm, reg, value);
  48
  49         _reg = (void *)ENP2611_PM3386_0_VIRT_BASE;
  50         if (pm == 1)
  51                 _reg = (void *)ENP2611_PM3386_1_VIRT_BASE;
  52
  53         *((volatile u16 *)(_reg + (reg << 1))) = value;
  54
  55         dummy = *((volatile u16 *)_reg);
  56         __asm__ __volatile__("mov %0, %0" : "+r" (dummy));
  57 }
  58
  59 /*
  60  * Read from port 'port' register 'reg', where the registers
  61  * for the different ports are 'spacing' registers apart.
  62  */
  63 static u16 pm3386_port_reg_read(int port, int _reg, int spacing)
  64 {
  65         int reg;
  66
  67         reg = _reg;
  68         if (port & 1)
  69                 reg += spacing;
  70
  71         return pm3386_reg_read(port >> 1, reg);
  72 }
  73
  74 /*
  75  * Write to port 'port' register 'reg', where the registers
  76  * for the different ports are 'spacing' registers apart.
  77  */
  78 static void pm3386_port_reg_write(int port, int _reg, int spacing, u16 value)
  79 {
  80         int reg;
  81
  82         reg = _reg;
  83         if (port & 1)
  84                 reg += spacing;
  85
  86         pm3386_reg_write(port >> 1, reg, value);
  87 }
  88
  89
  90 void pm3386_reset(void)
  91 {
  92         u8 mac[3][6];
  93
  94         /* Save programmed MAC addresses.  */
  95         pm3386_get_mac(0, mac[0]);
  96         pm3386_get_mac(1, mac[1]);
  97         pm3386_get_mac(2, mac[2]);
  98
  99         /* Assert analog and digital reset.  */
 100         pm3386_reg_write(0, 0x002, 0x0060);
 101         pm3386_reg_write(1, 0x002, 0x0060);
 102         mdelay(1);
 103
 104         /* Deassert analog reset.  */
 105         pm3386_reg_write(0, 0x002, 0x0062);
 106         pm3386_reg_write(1, 0x002, 0x0062);
 107         mdelay(10);
 108
 109         /* Deassert digital reset.  */
 110         pm3386_reg_write(0, 0x002, 0x0063);
 111         pm3386_reg_write(1, 0x002, 0x0063);
 112         mdelay(10);
 113
 114         /* Restore programmed MAC addresses.  */
 115         pm3386_set_mac(0, mac[0]);
 116         pm3386_set_mac(1, mac[1]);
 117         pm3386_set_mac(2, mac[2]);
 118
 119         /* Disable carrier on all ports.  */
 120         pm3386_set_carrier(0, 0);
 121         pm3386_set_carrier(1, 0);
 122         pm3386_set_carrier(2, 0);
 123 }
 124
 125 static u16 swaph(u16 x)
 126 {
 127         return ((x << 8) | (x >> 8)) & 0xffff;
 128 }
 129
 130 void pm3386_init_port(int port)
 131 {
 132         int pm = port >> 1;
 133
 134         /*
 135          * Work around ENP2611 bootloader programming MAC address
 136          * in reverse.
 137          */
 138         if (pm3386_port_reg_read(port, 0x30a, 0x100) == 0x0000 &&
 139             (pm3386_port_reg_read(port, 0x309, 0x100) & 0xff00) == 0x5000) {
 140                 u16 temp[3];
 141
 142                 temp[0] = pm3386_port_reg_read(port, 0x308, 0x100);
 143                 temp[1] = pm3386_port_reg_read(port, 0x309, 0x100);
 144                 temp[2] = pm3386_port_reg_read(port, 0x30a, 0x100);
 145                 pm3386_port_reg_write(port, 0x308, 0x100, swaph(temp[2]));
 146                 pm3386_port_reg_write(port, 0x309, 0x100, swaph(temp[1]));
 147                 pm3386_port_reg_write(port, 0x30a, 0x100, swaph(temp[0]));
 148         }
 149
 150         /*
 151          * Initialise narrowbanding mode.  See application note 2010486
 152          * for more information.  (@@@ We also need to issue a reset
 153          * when ROOL or DOOL are detected.)
 154          */
 155         pm3386_port_reg_write(port, 0x708, 0x10, 0xd055);
 156         udelay(500);
 157         pm3386_port_reg_write(port, 0x708, 0x10, 0x5055);
 158
 159         /*
 160          * SPI-3 ingress block.  Set 64 bytes SPI-3 burst size
 161          * towards SPI-3 bridge.
 162          */
 163         pm3386_port_reg_write(port, 0x122, 0x20, 0x0002);
 164
 165         /*
 166          * Enable ingress protocol checking, and soft reset the
 167          * SPI-3 ingress block.
 168          */
 169         pm3386_reg_write(pm, 0x103, 0x0003);
 170         while (!(pm3386_reg_read(pm, 0x103) & 0x80))
 171                 ;
 172
 173         /*
 174          * SPI-3 egress block.  Gather 12288 bytes of the current
 175          * packet in the TX fifo before initiating transmit on the
 176          * SERDES interface.  (Prevents TX underflows.)
 177          */
 178         pm3386_port_reg_write(port, 0x221, 0x20, 0x0007);
 179
 180         /*
 181          * Enforce odd parity from the SPI-3 bridge, and soft reset
 182          * the SPI-3 egress block.
 183          */
 184         pm3386_reg_write(pm, 0x203, 0x000d & ~(4 << (port & 1)));
 185         while ((pm3386_reg_read(pm, 0x203) & 0x000c) != 0x000c)
 186                 ;
 187
 188         /*
 189          * EGMAC block.  Set this channels to reject long preambles,
 190          * not send or transmit PAUSE frames, enable preamble checking,
 191          * disable frame length checking, enable FCS appending, enable
 192          * TX frame padding.
 193          */
 194         pm3386_port_reg_write(port, 0x302, 0x100, 0x0113);
 195
 196         /*
 197          * Soft reset the EGMAC block.
 198          */
 199         pm3386_port_reg_write(port, 0x301, 0x100, 0x8000);
 200         pm3386_port_reg_write(port, 0x301, 0x100, 0x0000);
 201
 202         /*
 203          * Auto-sense autonegotiation status.
 204          */
 205         pm3386_port_reg_write(port, 0x306, 0x100, 0x0100);
 206
 207         /*
 208          * Allow reception of jumbo frames.
 209          */
 210         pm3386_port_reg_write(port, 0x310, 0x100, 9018);
 211
 212         /*
 213          * Allow transmission of jumbo frames.
 214          */
 215         pm3386_port_reg_write(port, 0x336, 0x100, 9018);
 216
 217         /* @@@ Should set 0x337/0x437 (RX forwarding threshold.)  */
 218
 219         /*
 220          * Set autonegotiation parameters to 'no PAUSE, full duplex.'
 221          */
 222         pm3386_port_reg_write(port, 0x31c, 0x100, 0x0020);
 223
 224         /*
 225          * Enable and restart autonegotiation.
 226          */
 227         pm3386_port_reg_write(port, 0x318, 0x100, 0x0003);
 228         pm3386_port_reg_write(port, 0x318, 0x100, 0x0002);
 229 }
 230
 231 void pm3386_get_mac(int port, u8 *mac)
 232 {
 233         u16 temp;
 234
 235         temp = pm3386_port_reg_read(port, 0x308, 0x100);
 236         mac[0] = temp & 0xff;
 237         mac[1] = (temp >> 8) & 0xff;
 238
 239         temp = pm3386_port_reg_read(port, 0x309, 0x100);
 240         mac[2] = temp & 0xff;
 241         mac[3] = (temp >> 8) & 0xff;
 242
 243         temp = pm3386_port_reg_read(port, 0x30a, 0x100);
 244         mac[4] = temp & 0xff;
 245         mac[5] = (temp >> 8) & 0xff;
 246 }
 247
 248 void pm3386_set_mac(int port, u8 *mac)
 249 {
 250         pm3386_port_reg_write(port, 0x308, 0x100, (mac[1] << 8) | mac[0]);
 251         pm3386_port_reg_write(port, 0x309, 0x100, (mac[3] << 8) | mac[2]);
 252         pm3386_port_reg_write(port, 0x30a, 0x100, (mac[5] << 8) | mac[4]);
 253 }
 254
 255 static u32 pm3386_get_stat(int port, u16 base)
 256 {
 257         u32 value;
 258
 259         value = pm3386_port_reg_read(port, base, 0x100);
 260         value |= pm3386_port_reg_read(port, base + 1, 0x100) << 16;
 261
 262         return value;
 263 }
 264
 265 void pm3386_get_stats(int port, struct net_device_stats *stats)
 266 {
 267         /*
 268          * Snapshot statistics counters.
 269          */
 270         pm3386_port_reg_write(port, 0x500, 0x100, 0x0001);
 271         while (pm3386_port_reg_read(port, 0x500, 0x100) & 0x0001)
 272                 ;
 273
 274         memset(stats, 0, sizeof(*stats));
 275
 276         stats->rx_packets = pm3386_get_stat(port, 0x510);
 277         stats->tx_packets = pm3386_get_stat(port, 0x590);
 278         stats->rx_bytes = pm3386_get_stat(port, 0x514);
 279         stats->tx_bytes = pm3386_get_stat(port, 0x594);
 280         /* @@@ Add other stats.  */
 281 }
 282
 283 void pm3386_set_carrier(int port, int state)
 284 {
 285         pm3386_port_reg_write(port, 0x703, 0x10, state ? 0x1001 : 0x0000);
 286 }
 287
 288 int pm3386_is_link_up(int port)
 289 {
 290         u16 temp;
 291
 292         temp = pm3386_port_reg_read(port, 0x31a, 0x100);
 293         temp = pm3386_port_reg_read(port, 0x31a, 0x100);
 294
 295         return !!(temp & 0x0002);
 296 }
 297
 298 void pm3386_enable_rx(int port)
 299 {
 300         u16 temp;
 301
 302         temp = pm3386_port_reg_read(port, 0x303, 0x100);
 303         temp |= 0x1000;
 304         pm3386_port_reg_write(port, 0x303, 0x100, temp);
 305 }
 306
 307 void pm3386_disable_rx(int port)
 308 {
 309         u16 temp;
 310
 311         temp = pm3386_port_reg_read(port, 0x303, 0x100);
 312         temp &= 0xefff;
 313         pm3386_port_reg_write(port, 0x303, 0x100, temp);
 314 }
 315
 316 void pm3386_enable_tx(int port)
 317 {
 318         u16 temp;
 319
 320         temp = pm3386_port_reg_read(port, 0x303, 0x100);
 321         temp |= 0x4000;
 322         pm3386_port_reg_write(port, 0x303, 0x100, temp);
 323 }
 324
 325 void pm3386_disable_tx(int port)
 326 {
 327         u16 temp;
 328
 329         temp = pm3386_port_reg_read(port, 0x303, 0x100);
 330         temp &= 0xbfff;
 331         pm3386_port_reg_write(port, 0x303, 0x100, temp);
 332 }
 333
 334 MODULE_LICENSE("GPL");