drivers/net/chelsio/espi.c

   1 /*****************************************************************************
   2  *                                                                           *
   3  * File: espi.c                                                              *
   4  * $Revision: 1.14 $                                                         *
   5  * $Date: 2005/05/14 00:59:32 $                                              *
   6  * Description:                                                              *
   7  *  Ethernet SPI functionality.                                              *
   8  *  part of the Chelsio 10Gb Ethernet Driver.                                *
   9  *                                                                           *
  10  * This program is free software; you can redistribute it and/or modify      *
  11  * it under the terms of the GNU General Public License, version 2, as       *
  12  * published by the Free Software Foundation.                                *
  13  *                                                                           *
  14  * You should have received a copy of the GNU General Public License along   *
  15  * with this program; if not, write to the Free Software Foundation, Inc.,   *
  16  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.                 *
  17  *                                                                           *
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED    *
  19  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF      *
  20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.                     *
  21  *                                                                           *
  22  * http://www.chelsio.com                                                    *
  23  *                                                                           *
  24  * Copyright (c) 2003 - 2005 Chelsio Communications, Inc.                    *
  25  * All rights reserved.                                                      *
  26  *                                                                           *
  27  * Maintainers: maintainers@chelsio.com                                      *
  28  *                                                                           *
  29  * Authors: Dimitrios Michailidis   <dm@chelsio.com>                         *
  30  *          Tina Yang               <tainay@chelsio.com>                     *
  31  *          Felix Marti             <felix@chelsio.com>                      *
  32  *          Scott Bardone           <sbardone@chelsio.com>                   *
  33  *          Kurt Ottaway            <kottaway@chelsio.com>                   *
  34  *          Frank DiMambro          <frank@chelsio.com>                      *
  35  *                                                                           *
  36  * History:                                                                  *
  37  *                                                                           *
  38  ****************************************************************************/
  39
  40 #include "common.h"
  41 #include "regs.h"
  42 #include "espi.h"
  43
  44 struct peespi {
  45         adapter_t *adapter;
  46         struct espi_intr_counts intr_cnt;
  47         u32 misc_ctrl;
  48         spinlock_t lock;
  49 };
  50
  51 #define ESPI_INTR_MASK (F_DIP4ERR | F_RXDROP | F_TXDROP | F_RXOVERFLOW | \
  52                         F_RAMPARITYERR | F_DIP2PARITYERR)
  53 #define MON_MASK  (V_MONITORED_PORT_NUM(3) | F_MONITORED_DIRECTION \
  54                    | F_MONITORED_INTERFACE)
  55
  56 #define TRICN_CNFG 14
  57 #define TRICN_CMD_READ  0x11
  58 #define TRICN_CMD_WRITE 0x21
  59 #define TRICN_CMD_ATTEMPTS 10
  60
  61 static int tricn_write(adapter_t *adapter, int bundle_addr, int module_addr,
  62                        int ch_addr, int reg_offset, u32 wr_data)
  63 {
  64         int busy, attempts = TRICN_CMD_ATTEMPTS;
  65
  66         writel(V_WRITE_DATA(wr_data) |
  67                V_REGISTER_OFFSET(reg_offset) |
  68                V_CHANNEL_ADDR(ch_addr) | V_MODULE_ADDR(module_addr) |
  69                V_BUNDLE_ADDR(bundle_addr) |
  70                V_SPI4_COMMAND(TRICN_CMD_WRITE),
  71                adapter->regs + A_ESPI_CMD_ADDR);
  72         writel(0, adapter->regs + A_ESPI_GOSTAT);
  73
  74         do {
  75                 busy = readl(adapter->regs + A_ESPI_GOSTAT) & F_ESPI_CMD_BUSY;
  76         } while (busy && --attempts);
  77
  78         if (busy)
  79                 CH_ERR("%s: TRICN write timed out\n", adapter->name);
  80
  81         return busy;
  82 }
  83
  84 /* 1. Deassert rx_reset_core. */
  85 /* 2. Program TRICN_CNFG registers. */
  86 /* 3. Deassert rx_reset_link */
  87 static int tricn_init(adapter_t *adapter)
  88 {
  89         int     i               = 0;
  90         int     stat            = 0;
  91         int     timeout         = 0;
  92         int     is_ready        = 0;
  93
  94         /* 1 */
  95         timeout=1000;
  96         do {
  97                 stat = readl(adapter->regs + A_ESPI_RX_RESET);
  98                 is_ready = (stat & 0x4);
  99                 timeout--;
 100                 udelay(5);
 101         } while (!is_ready || (timeout==0));
 102         writel(0x2, adapter->regs + A_ESPI_RX_RESET);
 103         if (timeout==0)
 104         {
 105                 CH_ERR("ESPI : ERROR : Timeout tricn_init() \n");
 106                 t1_fatal_err(adapter);
 107         }
 108
 109         /* 2 */
 110         tricn_write(adapter, 0, 0, 0, TRICN_CNFG, 0x81);
 111         tricn_write(adapter, 0, 1, 0, TRICN_CNFG, 0x81);
 112         tricn_write(adapter, 0, 2, 0, TRICN_CNFG, 0x81);
 113         for (i=1; i<= 8; i++) tricn_write(adapter, 0, 0, i, TRICN_CNFG, 0xf1);
 114         for (i=1; i<= 2; i++) tricn_write(adapter, 0, 1, i, TRICN_CNFG, 0xf1);
 115         for (i=1; i<= 3; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xe1);
 116         for (i=4; i<= 4; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xf1);
 117         for (i=5; i<= 5; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xe1);
 118         for (i=6; i<= 6; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xf1);
 119         for (i=7; i<= 7; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0x80);
 120         for (i=8; i<= 8; i++) tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xf1);
 121
 122         /* 3 */
 123         writel(0x3, adapter->regs + A_ESPI_RX_RESET);
 124
 125         return 0;
 126 }
 127
 128 void t1_espi_intr_enable(struct peespi *espi)
 129 {
 130         u32 enable, pl_intr = readl(espi->adapter->regs + A_PL_ENABLE);
 131
 132         /*
 133          * Cannot enable ESPI interrupts on T1B because HW asserts the
 134          * interrupt incorrectly, namely the driver gets ESPI interrupts
 135          * but no data is actually dropped (can verify this reading the ESPI
 136          * drop registers).  Also, once the ESPI interrupt is asserted it
 137          * cannot be cleared (HW bug).
 138          */
 139         enable = t1_is_T1B(espi->adapter) ? 0 : ESPI_INTR_MASK;
 140         writel(enable, espi->adapter->regs + A_ESPI_INTR_ENABLE);
 141         writel(pl_intr | F_PL_INTR_ESPI, espi->adapter->regs + A_PL_ENABLE);
 142 }
 143
 144 void t1_espi_intr_clear(struct peespi *espi)
 145 {
 146         writel(0xffffffff, espi->adapter->regs + A_ESPI_INTR_STATUS);
 147         writel(F_PL_INTR_ESPI, espi->adapter->regs + A_PL_CAUSE);
 148 }
 149
 150 void t1_espi_intr_disable(struct peespi *espi)
 151 {
 152         u32 pl_intr = readl(espi->adapter->regs + A_PL_ENABLE);
 153
 154         writel(0, espi->adapter->regs + A_ESPI_INTR_ENABLE);
 155         writel(pl_intr & ~F_PL_INTR_ESPI, espi->adapter->regs + A_PL_ENABLE);
 156 }
 157
 158 int t1_espi_intr_handler(struct peespi *espi)
 159 {
 160         u32 cnt;
 161         u32 status = readl(espi->adapter->regs + A_ESPI_INTR_STATUS);
 162
 163         if (status & F_DIP4ERR)
 164                 espi->intr_cnt.DIP4_err++;
 165         if (status & F_RXDROP)
 166                 espi->intr_cnt.rx_drops++;
 167         if (status & F_TXDROP)
 168                 espi->intr_cnt.tx_drops++;
 169         if (status & F_RXOVERFLOW)
 170                 espi->intr_cnt.rx_ovflw++;
 171         if (status & F_RAMPARITYERR)
 172                 espi->intr_cnt.parity_err++;
 173         if (status & F_DIP2PARITYERR) {
 174                 espi->intr_cnt.DIP2_parity_err++;
 175
 176                 /*
 177                  * Must read the error count to clear the interrupt
 178                  * that it causes.
 179                  */
 180                 cnt = readl(espi->adapter->regs + A_ESPI_DIP2_ERR_COUNT);
 181         }
 182
 183         /*
 184          * For T1B we need to write 1 to clear ESPI interrupts.  For T2+ we
 185          * write the status as is.
 186          */
 187         if (status && t1_is_T1B(espi->adapter))
 188                 status = 1;
 189         writel(status, espi->adapter->regs + A_ESPI_INTR_STATUS);
 190         return 0;
 191 }
 192
 193 const struct espi_intr_counts *t1_espi_get_intr_counts(struct peespi *espi)
 194 {
 195     return &espi->intr_cnt;
 196 }
 197
 198 static void espi_setup_for_pm3393(adapter_t *adapter)
 199 {
 200         u32 wmark = t1_is_T1B(adapter) ? 0x4000 : 0x3200;
 201
 202         writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN0);
 203         writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN1);
 204         writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN2);
 205         writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN3);
 206         writel(0x100, adapter->regs + A_ESPI_RX_FIFO_ALMOST_EMPTY_WATERMARK);
 207         writel(wmark, adapter->regs + A_ESPI_RX_FIFO_ALMOST_FULL_WATERMARK);
 208         writel(3, adapter->regs + A_ESPI_CALENDAR_LENGTH);
 209         writel(0x08000008, adapter->regs + A_ESPI_TRAIN);
 210         writel(V_RX_NPORTS(1) | V_TX_NPORTS(1), adapter->regs + A_PORT_CONFIG);
 211 }
 212
 213 /* T2 Init part --  */
 214 /* 1. Set T_ESPI_MISCCTRL_ADDR */
 215 /* 2. Init ESPI registers. */
 216 /* 3. Init TriCN Hard Macro */
 217 int t1_espi_init(struct peespi *espi, int mac_type, int nports)
 218 {
 219         u32 cnt;
 220
 221         u32 status_enable_extra = 0;
 222         adapter_t *adapter = espi->adapter;
 223         u32 status, burstval = 0x800100;
 224
 225         /* Disable ESPI training.  MACs that can handle it enable it below. */
 226         writel(0, adapter->regs + A_ESPI_TRAIN);
 227
 228         if (is_T2(adapter)) {
 229                 writel(V_OUT_OF_SYNC_COUNT(4) |
 230                        V_DIP2_PARITY_ERR_THRES(3) |
 231                        V_DIP4_THRES(1), adapter->regs + A_ESPI_MISC_CONTROL);
 232                 if (nports == 4) {
 233                         /* T204: maxburst1 = 0x40, maxburst2 = 0x20 */
 234                         burstval = 0x200040;
 235                 }
 236         }
 237         writel(burstval, adapter->regs + A_ESPI_MAXBURST1_MAXBURST2);
 238
 239         switch (mac_type) {
 240         case CHBT_MAC_PM3393:
 241                 espi_setup_for_pm3393(adapter);
 242                 break;
 243         default:
 244                 return -1;
 245         }
 246
 247         /*
 248          * Make sure any pending interrupts from the SPI are
 249          * Cleared before enabling the interrupt.
 250          */
 251         writel(ESPI_INTR_MASK, espi->adapter->regs + A_ESPI_INTR_ENABLE);
 252         status = readl(espi->adapter->regs + A_ESPI_INTR_STATUS);
 253         if (status & F_DIP2PARITYERR) {
 254                 cnt = readl(espi->adapter->regs + A_ESPI_DIP2_ERR_COUNT);
 255         }
 256
 257         /*
 258          * For T1B we need to write 1 to clear ESPI interrupts.  For T2+ we
 259          * write the status as is.
 260          */
 261         if (status && t1_is_T1B(espi->adapter))
 262                 status = 1;
 263         writel(status, espi->adapter->regs + A_ESPI_INTR_STATUS);
 264
 265         writel(status_enable_extra | F_RXSTATUSENABLE,
 266                adapter->regs + A_ESPI_FIFO_STATUS_ENABLE);
 267
 268         if (is_T2(adapter)) {
 269                 tricn_init(adapter);
 270                 /*
 271                  * Always position the control at the 1st port egress IN
 272                  * (sop,eop) counter to reduce PIOs for T/N210 workaround.
 273                  */
 274                 espi->misc_ctrl = (readl(adapter->regs + A_ESPI_MISC_CONTROL)
 275                                    & ~MON_MASK) | (F_MONITORED_DIRECTION
 276                                    | F_MONITORED_INTERFACE);
 277                 writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
 278                 spin_lock_init(&espi->lock);
 279         }
 280
 281         return 0;
 282 }
 283
 284 void t1_espi_destroy(struct peespi *espi)
 285 {
 286         kfree(espi);
 287 }
 288
 289 struct peespi *t1_espi_create(adapter_t *adapter)
 290 {
 291         struct peespi *espi = kzalloc(sizeof(*espi), GFP_KERNEL);
 292
 293         if (espi)
 294                 espi->adapter = adapter;
 295         return espi;
 296 }
 297
 298 void t1_espi_set_misc_ctrl(adapter_t *adapter, u32 val)
 299 {
 300         struct peespi *espi = adapter->espi;
 301
 302         if (!is_T2(adapter))
 303                 return;
 304         spin_lock(&espi->lock);
 305         espi->misc_ctrl = (val & ~MON_MASK) |
 306                           (espi->misc_ctrl & MON_MASK);
 307         writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
 308         spin_unlock(&espi->lock);
 309 }
 310
 311 u32 t1_espi_get_mon(adapter_t *adapter, u32 addr, u8 wait)
 312 {
 313         u32 sel;
 314
 315         struct peespi *espi = adapter->espi;
 316
 317         if (!is_T2(adapter))
 318                 return 0;
 319         sel = V_MONITORED_PORT_NUM((addr & 0x3c) >> 2);
 320         if (!wait) {
 321                 if (!spin_trylock(&espi->lock))
 322                         return 0;
 323         }
 324         else
 325                 spin_lock(&espi->lock);
 326         if ((sel != (espi->misc_ctrl & MON_MASK))) {
 327                 writel(((espi->misc_ctrl & ~MON_MASK) | sel),
 328                        adapter->regs + A_ESPI_MISC_CONTROL);
 329                 sel = readl(adapter->regs + A_ESPI_SCH_TOKEN3);
 330                 writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
 331         }
 332         else
 333                 sel = readl(adapter->regs + A_ESPI_SCH_TOKEN3);
 334         spin_unlock(&espi->lock);
 335         return sel;
 336 }