drivers/net/ethernet/xscale/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/module.h>
  13 #include <linux/delay.h>
  14 #include <linux/netdevice.h>
  15 #include <asm/io.h>
  16 #include "pm3386.h"
  17
  18 /*
  19  * Read from register 'reg' of PM3386 device 'pm'.
  20  */
  21 static u16 pm3386_reg_read(int pm, int reg)
  22 {
  23         void *_reg;
  24         u16 value;
  25
  26         _reg = (void *)ENP2611_PM3386_0_VIRT_BASE;
  27         if (pm == 1)
  28                 _reg = (void *)ENP2611_PM3386_1_VIRT_BASE;
  29
  30         value = *((volatile u16 *)(_reg + (reg << 1)));
  31
  32 //      printk(KERN_INFO "pm3386_reg_read(%d, %.3x) = %.8x\n", pm, reg, value);
  33
  34         return value;
  35 }
  36
  37 /*
  38  * Write to register 'reg' of PM3386 device 'pm', and perform
  39  * a readback from the identification register.
  40  */
  41 static void pm3386_reg_write(int pm, int reg, u16 value)
  42 {
  43         void *_reg;
  44         u16 dummy;
  45
  46 //      printk(KERN_INFO "pm3386_reg_write(%d, %.3x, %.8x)\n", pm, reg, value);
  47
  48         _reg = (void *)ENP2611_PM3386_0_VIRT_BASE;
  49         if (pm == 1)
  50                 _reg = (void *)ENP2611_PM3386_1_VIRT_BASE;
  51
  52         *((volatile u16 *)(_reg + (reg << 1))) = value;
  53
  54         dummy = *((volatile u16 *)_reg);
  55         __asm__ __volatile__("mov %0, %0" : "+r" (dummy));
  56 }
  57
  58 /*
  59  * Read from port 'port' register 'reg', where the registers
  60  * for the different ports are 'spacing' registers apart.
  61  */
  62 static u16 pm3386_port_reg_read(int port, int _reg, int spacing)
  63 {
  64         int reg;
  65
  66         reg = _reg;
  67         if (port & 1)
  68                 reg += spacing;
  69
  70         return pm3386_reg_read(port >> 1, reg);
  71 }
  72
  73 /*
  74  * Write to port 'port' register 'reg', where the registers
  75  * for the different ports are 'spacing' registers apart.
  76  */
  77 static void pm3386_port_reg_write(int port, int _reg, int spacing, u16 value)
  78 {
  79         int reg;
  80
  81         reg = _reg;
  82         if (port & 1)
  83                 reg += spacing;
  84
  85         pm3386_reg_write(port >> 1, reg, value);
  86 }
  87
  88 int pm3386_secondary_present(void)
  89 {
  90         return pm3386_reg_read(1, 0) == 0x3386;
  91 }
  92
  93 void pm3386_reset(void)
  94 {
  95         u8 mac[3][6];
  96         int secondary;
  97
  98         secondary = pm3386_secondary_present();
  99
 100         /* Save programmed MAC addresses.  */
 101         pm3386_get_mac(0, mac[0]);
 102         pm3386_get_mac(1, mac[1]);
 103         if (secondary)
 104                 pm3386_get_mac(2, mac[2]);
 105
 106         /* Assert analog and digital reset.  */
 107         pm3386_reg_write(0, 0x002, 0x0060);
 108         if (secondary)
 109                 pm3386_reg_write(1, 0x002, 0x0060);
 110         mdelay(1);
 111
 112         /* Deassert analog reset.  */
 113         pm3386_reg_write(0, 0x002, 0x0062);
 114         if (secondary)
 115                 pm3386_reg_write(1, 0x002, 0x0062);
 116         mdelay(10);
 117
 118         /* Deassert digital reset.  */
 119         pm3386_reg_write(0, 0x002, 0x0063);
 120         if (secondary)
 121                 pm3386_reg_write(1, 0x002, 0x0063);
 122         mdelay(10);
 123
 124         /* Restore programmed MAC addresses.  */
 125         pm3386_set_mac(0, mac[0]);
 126         pm3386_set_mac(1, mac[1]);
 127         if (secondary)
 128                 pm3386_set_mac(2, mac[2]);
 129
 130         /* Disable carrier on all ports.  */
 131         pm3386_set_carrier(0, 0);
 132         pm3386_set_carrier(1, 0);
 133         if (secondary)
 134                 pm3386_set_carrier(2, 0);
 135 }
 136
 137 static u16 swaph(u16 x)
 138 {
 139         return ((x << 8) | (x >> 8)) & 0xffff;
 140 }
 141
 142 int pm3386_port_count(void)
 143 {
 144         return 2 + pm3386_secondary_present();
 145 }
 146
 147 void pm3386_init_port(int port)
 148 {
 149         int pm = port >> 1;
 150
 151         /*
 152          * Work around ENP2611 bootloader programming MAC address
 153          * in reverse.
 154          */
 155         if (pm3386_port_reg_read(port, 0x30a, 0x100) == 0x0000 &&
 156             (pm3386_port_reg_read(port, 0x309, 0x100) & 0xff00) == 0x5000) {
 157                 u16 temp[3];
 158
 159                 temp[0] = pm3386_port_reg_read(port, 0x308, 0x100);
 160                 temp[1] = pm3386_port_reg_read(port, 0x309, 0x100);
 161                 temp[2] = pm3386_port_reg_read(port, 0x30a, 0x100);
 162                 pm3386_port_reg_write(port, 0x308, 0x100, swaph(temp[2]));
 163                 pm3386_port_reg_write(port, 0x309, 0x100, swaph(temp[1]));
 164                 pm3386_port_reg_write(port, 0x30a, 0x100, swaph(temp[0]));
 165         }
 166
 167         /*
 168          * Initialise narrowbanding mode.  See application note 2010486
 169          * for more information.  (@@@ We also need to issue a reset
 170          * when ROOL or DOOL are detected.)
 171          */
 172         pm3386_port_reg_write(port, 0x708, 0x10, 0xd055);
 173         udelay(500);
 174         pm3386_port_reg_write(port, 0x708, 0x10, 0x5055);
 175
 176         /*
 177          * SPI-3 ingress block.  Set 64 bytes SPI-3 burst size
 178          * towards SPI-3 bridge.
 179          */
 180         pm3386_port_reg_write(port, 0x122, 0x20, 0x0002);
 181
 182         /*
 183          * Enable ingress protocol checking, and soft reset the
 184          * SPI-3 ingress block.
 185          */
 186         pm3386_reg_write(pm, 0x103, 0x0003);
 187         while (!(pm3386_reg_read(pm, 0x103) & 0x80))
 188                 ;
 189
 190         /*
 191          * SPI-3 egress block.  Gather 12288 bytes of the current
 192          * packet in the TX fifo before initiating transmit on the
 193          * SERDES interface.  (Prevents TX underflows.)
 194          */
 195         pm3386_port_reg_write(port, 0x221, 0x20, 0x0007);
 196
 197         /*
 198          * Enforce odd parity from the SPI-3 bridge, and soft reset
 199          * the SPI-3 egress block.
 200          */
 201         pm3386_reg_write(pm, 0x203, 0x000d & ~(4 << (port & 1)));
 202         while ((pm3386_reg_read(pm, 0x203) & 0x000c) != 0x000c)
 203                 ;
 204
 205         /*
 206          * EGMAC block.  Set this channels to reject long preambles,
 207          * not send or transmit PAUSE frames, enable preamble checking,
 208          * disable frame length checking, enable FCS appending, enable
 209          * TX frame padding.
 210          */
 211         pm3386_port_reg_write(port, 0x302, 0x100, 0x0113);
 212
 213         /*
 214          * Soft reset the EGMAC block.
 215          */
 216         pm3386_port_reg_write(port, 0x301, 0x100, 0x8000);
 217         pm3386_port_reg_write(port, 0x301, 0x100, 0x0000);
 218
 219         /*
 220          * Auto-sense autonegotiation status.
 221          */
 222         pm3386_port_reg_write(port, 0x306, 0x100, 0x0100);
 223
 224         /*
 225          * Allow reception of jumbo frames.
 226          */
 227         pm3386_port_reg_write(port, 0x310, 0x100, 9018);
 228
 229         /*
 230          * Allow transmission of jumbo frames.
 231          */
 232         pm3386_port_reg_write(port, 0x336, 0x100, 9018);
 233
 234         /* @@@ Should set 0x337/0x437 (RX forwarding threshold.)  */
 235
 236         /*
 237          * Set autonegotiation parameters to 'no PAUSE, full duplex.'
 238          */
 239         pm3386_port_reg_write(port, 0x31c, 0x100, 0x0020);
 240
 241         /*
 242          * Enable and restart autonegotiation.
 243          */
 244         pm3386_port_reg_write(port, 0x318, 0x100, 0x0003);
 245         pm3386_port_reg_write(port, 0x318, 0x100, 0x0002);
 246 }
 247
 248 void pm3386_get_mac(int port, u8 *mac)
 249 {
 250         u16 temp;
 251
 252         temp = pm3386_port_reg_read(port, 0x308, 0x100);
 253         mac[0] = temp & 0xff;
 254         mac[1] = (temp >> 8) & 0xff;
 255
 256         temp = pm3386_port_reg_read(port, 0x309, 0x100);
 257         mac[2] = temp & 0xff;
 258         mac[3] = (temp >> 8) & 0xff;
 259
 260         temp = pm3386_port_reg_read(port, 0x30a, 0x100);
 261         mac[4] = temp & 0xff;
 262         mac[5] = (temp >> 8) & 0xff;
 263 }
 264
 265 void pm3386_set_mac(int port, u8 *mac)
 266 {
 267         pm3386_port_reg_write(port, 0x308, 0x100, (mac[1] << 8) | mac[0]);
 268         pm3386_port_reg_write(port, 0x309, 0x100, (mac[3] << 8) | mac[2]);
 269         pm3386_port_reg_write(port, 0x30a, 0x100, (mac[5] << 8) | mac[4]);
 270 }
 271
 272 static u32 pm3386_get_stat(int port, u16 base)
 273 {
 274         u32 value;
 275
 276         value = pm3386_port_reg_read(port, base, 0x100);
 277         value |= pm3386_port_reg_read(port, base + 1, 0x100) << 16;
 278
 279         return value;
 280 }
 281
 282 void pm3386_get_stats(int port, struct net_device_stats *stats)
 283 {
 284         /*
 285          * Snapshot statistics counters.
 286          */
 287         pm3386_port_reg_write(port, 0x500, 0x100, 0x0001);
 288         while (pm3386_port_reg_read(port, 0x500, 0x100) & 0x0001)
 289                 ;
 290
 291         memset(stats, 0, sizeof(*stats));
 292
 293         stats->rx_packets = pm3386_get_stat(port, 0x510);
 294         stats->tx_packets = pm3386_get_stat(port, 0x590);
 295         stats->rx_bytes = pm3386_get_stat(port, 0x514);
 296         stats->tx_bytes = pm3386_get_stat(port, 0x594);
 297         /* @@@ Add other stats.  */
 298 }
 299
 300 void pm3386_set_carrier(int port, int state)
 301 {
 302         pm3386_port_reg_write(port, 0x703, 0x10, state ? 0x1001 : 0x0000);
 303 }
 304
 305 int pm3386_is_link_up(int port)
 306 {
 307         u16 temp;
 308
 309         temp = pm3386_port_reg_read(port, 0x31a, 0x100);
 310         temp = pm3386_port_reg_read(port, 0x31a, 0x100);
 311
 312         return !!(temp & 0x0002);
 313 }
 314
 315 void pm3386_enable_rx(int port)
 316 {
 317         u16 temp;
 318
 319         temp = pm3386_port_reg_read(port, 0x303, 0x100);
 320         temp |= 0x1000;
 321         pm3386_port_reg_write(port, 0x303, 0x100, temp);
 322 }
 323
 324 void pm3386_disable_rx(int port)
 325 {
 326         u16 temp;
 327
 328         temp = pm3386_port_reg_read(port, 0x303, 0x100);
 329         temp &= 0xefff;
 330         pm3386_port_reg_write(port, 0x303, 0x100, temp);
 331 }
 332
 333 void pm3386_enable_tx(int port)
 334 {
 335         u16 temp;
 336
 337         temp = pm3386_port_reg_read(port, 0x303, 0x100);
 338         temp |= 0x4000;
 339         pm3386_port_reg_write(port, 0x303, 0x100, temp);
 340 }
 341
 342 void pm3386_disable_tx(int port)
 343 {
 344         u16 temp;
 345
 346         temp = pm3386_port_reg_read(port, 0x303, 0x100);
 347         temp &= 0xbfff;
 348         pm3386_port_reg_write(port, 0x303, 0x100, temp);
 349 }
 350
 351 MODULE_LICENSE("GPL");