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