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                 pr_err("%s: TRICN write timed out\n", adapter->name);
  80
  81         return busy;
  82 }
  83
  84 static int tricn_init(adapter_t *adapter)
  85 {
  86         int i, sme = 1;
  87
  88         if (!(readl(adapter->regs + A_ESPI_RX_RESET)  & F_RX_CLK_STATUS)) {
  89                 pr_err("%s: ESPI clock not ready\n", adapter->name);
  90                 return -1;
  91         }
  92
  93         writel(F_ESPI_RX_CORE_RST, adapter->regs + A_ESPI_RX_RESET);
  94
  95         if (sme) {
  96                 tricn_write(adapter, 0, 0, 0, TRICN_CNFG, 0x81);
  97                 tricn_write(adapter, 0, 1, 0, TRICN_CNFG, 0x81);
  98                 tricn_write(adapter, 0, 2, 0, TRICN_CNFG, 0x81);
  99         }
 100         for (i = 1; i <= 8; i++)
 101                 tricn_write(adapter, 0, 0, i, TRICN_CNFG, 0xf1);
 102         for (i = 1; i <= 2; i++)
 103                 tricn_write(adapter, 0, 1, i, TRICN_CNFG, 0xf1);
 104         for (i = 1; i <= 3; i++)
 105                 tricn_write(adapter, 0, 2, i, TRICN_CNFG, 0xe1);
 106         tricn_write(adapter, 0, 2, 4, TRICN_CNFG, 0xf1);
 107         tricn_write(adapter, 0, 2, 5, TRICN_CNFG, 0xe1);
 108         tricn_write(adapter, 0, 2, 6, TRICN_CNFG, 0xf1);
 109         tricn_write(adapter, 0, 2, 7, TRICN_CNFG, 0x80);
 110         tricn_write(adapter, 0, 2, 8, TRICN_CNFG, 0xf1);
 111
 112         writel(F_ESPI_RX_CORE_RST | F_ESPI_RX_LNK_RST,
 113                adapter->regs + A_ESPI_RX_RESET);
 114
 115         return 0;
 116 }
 117
 118 void t1_espi_intr_enable(struct peespi *espi)
 119 {
 120         u32 enable, pl_intr = readl(espi->adapter->regs + A_PL_ENABLE);
 121
 122         /*
 123          * Cannot enable ESPI interrupts on T1B because HW asserts the
 124          * interrupt incorrectly, namely the driver gets ESPI interrupts
 125          * but no data is actually dropped (can verify this reading the ESPI
 126          * drop registers).  Also, once the ESPI interrupt is asserted it
 127          * cannot be cleared (HW bug).
 128          */
 129         enable = t1_is_T1B(espi->adapter) ? 0 : ESPI_INTR_MASK;
 130         writel(enable, espi->adapter->regs + A_ESPI_INTR_ENABLE);
 131         writel(pl_intr | F_PL_INTR_ESPI, espi->adapter->regs + A_PL_ENABLE);
 132 }
 133
 134 void t1_espi_intr_clear(struct peespi *espi)
 135 {
 136         readl(espi->adapter->regs + A_ESPI_DIP2_ERR_COUNT);
 137         writel(0xffffffff, espi->adapter->regs + A_ESPI_INTR_STATUS);
 138         writel(F_PL_INTR_ESPI, espi->adapter->regs + A_PL_CAUSE);
 139 }
 140
 141 void t1_espi_intr_disable(struct peespi *espi)
 142 {
 143         u32 pl_intr = readl(espi->adapter->regs + A_PL_ENABLE);
 144
 145         writel(0, espi->adapter->regs + A_ESPI_INTR_ENABLE);
 146         writel(pl_intr & ~F_PL_INTR_ESPI, espi->adapter->regs + A_PL_ENABLE);
 147 }
 148
 149 int t1_espi_intr_handler(struct peespi *espi)
 150 {
 151         u32 status = readl(espi->adapter->regs + A_ESPI_INTR_STATUS);
 152
 153         if (status & F_DIP4ERR)
 154                 espi->intr_cnt.DIP4_err++;
 155         if (status & F_RXDROP)
 156                 espi->intr_cnt.rx_drops++;
 157         if (status & F_TXDROP)
 158                 espi->intr_cnt.tx_drops++;
 159         if (status & F_RXOVERFLOW)
 160                 espi->intr_cnt.rx_ovflw++;
 161         if (status & F_RAMPARITYERR)
 162                 espi->intr_cnt.parity_err++;
 163         if (status & F_DIP2PARITYERR) {
 164                 espi->intr_cnt.DIP2_parity_err++;
 165
 166                 /*
 167                  * Must read the error count to clear the interrupt
 168                  * that it causes.
 169                  */
 170                 readl(espi->adapter->regs + A_ESPI_DIP2_ERR_COUNT);
 171         }
 172
 173         /*
 174          * For T1B we need to write 1 to clear ESPI interrupts.  For T2+ we
 175          * write the status as is.
 176          */
 177         if (status && t1_is_T1B(espi->adapter))
 178                 status = 1;
 179         writel(status, espi->adapter->regs + A_ESPI_INTR_STATUS);
 180         return 0;
 181 }
 182
 183 const struct espi_intr_counts *t1_espi_get_intr_counts(struct peespi *espi)
 184 {
 185         return &espi->intr_cnt;
 186 }
 187
 188 static void espi_setup_for_pm3393(adapter_t *adapter)
 189 {
 190         u32 wmark = t1_is_T1B(adapter) ? 0x4000 : 0x3200;
 191
 192         writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN0);
 193         writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN1);
 194         writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN2);
 195         writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN3);
 196         writel(0x100, adapter->regs + A_ESPI_RX_FIFO_ALMOST_EMPTY_WATERMARK);
 197         writel(wmark, adapter->regs + A_ESPI_RX_FIFO_ALMOST_FULL_WATERMARK);
 198         writel(3, adapter->regs + A_ESPI_CALENDAR_LENGTH);
 199         writel(0x08000008, adapter->regs + A_ESPI_TRAIN);
 200         writel(V_RX_NPORTS(1) | V_TX_NPORTS(1), adapter->regs + A_PORT_CONFIG);
 201 }
 202
 203 static void espi_setup_for_vsc7321(adapter_t *adapter)
 204 {
 205         writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN0);
 206         writel(0x1f401f4, adapter->regs + A_ESPI_SCH_TOKEN1);
 207         writel(0x1f4, adapter->regs + A_ESPI_SCH_TOKEN2);
 208         writel(0xa00, adapter->regs + A_ESPI_RX_FIFO_ALMOST_FULL_WATERMARK);
 209         writel(0x1ff, adapter->regs + A_ESPI_RX_FIFO_ALMOST_EMPTY_WATERMARK);
 210         writel(1, adapter->regs + A_ESPI_CALENDAR_LENGTH);
 211         writel(V_RX_NPORTS(4) | V_TX_NPORTS(4), adapter->regs + A_PORT_CONFIG);
 212
 213         writel(0x08000008, adapter->regs + A_ESPI_TRAIN);
 214 }
 215
 216 /*
 217  * Note that T1B requires at least 2 ports for IXF1010 due to a HW bug.
 218  */
 219 static void espi_setup_for_ixf1010(adapter_t *adapter, int nports)
 220 {
 221         writel(1, adapter->regs + A_ESPI_CALENDAR_LENGTH);
 222         if (nports == 4) {
 223                 if (is_T2(adapter)) {
 224                         writel(0xf00, adapter->regs + A_ESPI_RX_FIFO_ALMOST_FULL_WATERMARK);
 225                         writel(0x3c0, adapter->regs + A_ESPI_RX_FIFO_ALMOST_EMPTY_WATERMARK);
 226                 } else {
 227                         writel(0x7ff, adapter->regs + A_ESPI_RX_FIFO_ALMOST_FULL_WATERMARK);
 228                         writel(0x1ff, adapter->regs + A_ESPI_RX_FIFO_ALMOST_EMPTY_WATERMARK);
 229                 }
 230         } else {
 231                 writel(0x1fff, adapter->regs + A_ESPI_RX_FIFO_ALMOST_FULL_WATERMARK);
 232                 writel(0x7ff, adapter->regs + A_ESPI_RX_FIFO_ALMOST_EMPTY_WATERMARK);
 233         }
 234         writel(V_RX_NPORTS(nports) | V_TX_NPORTS(nports), adapter->regs + A_PORT_CONFIG);
 235
 236 }
 237
 238 int t1_espi_init(struct peespi *espi, int mac_type, int nports)
 239 {
 240         u32 status_enable_extra = 0;
 241         adapter_t *adapter = espi->adapter;
 242
 243         /* Disable ESPI training.  MACs that can handle it enable it below. */
 244         writel(0, adapter->regs + A_ESPI_TRAIN);
 245
 246         if (is_T2(adapter)) {
 247                 writel(V_OUT_OF_SYNC_COUNT(4) |
 248                        V_DIP2_PARITY_ERR_THRES(3) |
 249                        V_DIP4_THRES(1), adapter->regs + A_ESPI_MISC_CONTROL);
 250                 writel(nports == 4 ? 0x200040 : 0x1000080,
 251                        adapter->regs + A_ESPI_MAXBURST1_MAXBURST2);
 252         } else
 253                 writel(0x800100, adapter->regs + A_ESPI_MAXBURST1_MAXBURST2);
 254
 255         if (mac_type == CHBT_MAC_PM3393)
 256                 espi_setup_for_pm3393(adapter);
 257         else if (mac_type == CHBT_MAC_VSC7321)
 258                 espi_setup_for_vsc7321(adapter);
 259         else if (mac_type == CHBT_MAC_IXF1010) {
 260                 status_enable_extra = F_INTEL1010MODE;
 261                 espi_setup_for_ixf1010(adapter, nports);
 262         } else
 263                 return -1;
 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                 espi->misc_ctrl &= ~MON_MASK;
 276                 espi->misc_ctrl |= F_MONITORED_DIRECTION;
 277                 if (adapter->params.nports == 1)
 278                         espi->misc_ctrl |= F_MONITORED_INTERFACE;
 279                 writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
 280                 spin_lock_init(&espi->lock);
 281         }
 282
 283         return 0;
 284 }
 285
 286 void t1_espi_destroy(struct peespi *espi)
 287 {
 288         kfree(espi);
 289 }
 290
 291 struct peespi *t1_espi_create(adapter_t *adapter)
 292 {
 293         struct peespi *espi = kzalloc(sizeof(*espi), GFP_KERNEL);
 294
 295         if (espi)
 296                 espi->adapter = adapter;
 297         return espi;
 298 }
 299
 300 #if 0
 301 void t1_espi_set_misc_ctrl(adapter_t *adapter, u32 val)
 302 {
 303         struct peespi *espi = adapter->espi;
 304
 305         if (!is_T2(adapter))
 306                 return;
 307         spin_lock(&espi->lock);
 308         espi->misc_ctrl = (val & ~MON_MASK) |
 309                           (espi->misc_ctrl & MON_MASK);
 310         writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
 311         spin_unlock(&espi->lock);
 312 }
 313 #endif  /*  0  */
 314
 315 u32 t1_espi_get_mon(adapter_t *adapter, u32 addr, u8 wait)
 316 {
 317         struct peespi *espi = adapter->espi;
 318         u32 sel;
 319
 320         if (!is_T2(adapter))
 321                 return 0;
 322
 323         sel = V_MONITORED_PORT_NUM((addr & 0x3c) >> 2);
 324         if (!wait) {
 325                 if (!spin_trylock(&espi->lock))
 326                         return 0;
 327         } else
 328                 spin_lock(&espi->lock);
 329
 330         if ((sel != (espi->misc_ctrl & MON_MASK))) {
 331                 writel(((espi->misc_ctrl & ~MON_MASK) | sel),
 332                        adapter->regs + A_ESPI_MISC_CONTROL);
 333                 sel = readl(adapter->regs + A_ESPI_SCH_TOKEN3);
 334                 writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
 335         } else
 336                 sel = readl(adapter->regs + A_ESPI_SCH_TOKEN3);
 337         spin_unlock(&espi->lock);
 338         return sel;
 339 }
 340
 341 /*
 342  * This function is for T204 only.
 343  * compare with t1_espi_get_mon(), it reads espiInTxSop[0 ~ 3] in
 344  * one shot, since there is no per port counter on the out side.
 345  */
 346 int t1_espi_get_mon_t204(adapter_t *adapter, u32 *valp, u8 wait)
 347 {
 348         struct peespi *espi = adapter->espi;
 349         u8 i, nport = (u8)adapter->params.nports;
 350
 351         if (!wait) {
 352                 if (!spin_trylock(&espi->lock))
 353                         return -1;
 354         } else
 355                 spin_lock(&espi->lock);
 356
 357         if ((espi->misc_ctrl & MON_MASK) != F_MONITORED_DIRECTION) {
 358                 espi->misc_ctrl = (espi->misc_ctrl & ~MON_MASK) |
 359                                         F_MONITORED_DIRECTION;
 360                 writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
 361         }
 362         for (i = 0 ; i < nport; i++, valp++) {
 363                 if (i) {
 364                         writel(espi->misc_ctrl | V_MONITORED_PORT_NUM(i),
 365                                adapter->regs + A_ESPI_MISC_CONTROL);
 366                 }
 367                 *valp = readl(adapter->regs + A_ESPI_SCH_TOKEN3);
 368         }
 369
 370         writel(espi->misc_ctrl, adapter->regs + A_ESPI_MISC_CONTROL);
 371         spin_unlock(&espi->lock);
 372         return 0;
 373 }