git.oblomov.eu Git - linux-2.6/blob - arch/powerpc/sysdev/qe_lib/ucc_fast.c

   1 /*
   2  * Copyright (C) 2006 Freescale Semicondutor, Inc. All rights reserved.
   3  *
   4  * Authors:     Shlomi Gridish <gridish@freescale.com>
   5  *              Li Yang <leoli@freescale.com>
   6  *
   7  * Description:
   8  * QE UCC Fast API Set - UCC Fast specific routines implementations.
   9  *
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  */
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19 #include <linux/stddef.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/err.h>
  22
  23 #include <asm/io.h>
  24 #include <asm/immap_qe.h>
  25 #include <asm/qe.h>
  26
  27 #include <asm/ucc.h>
  28 #include <asm/ucc_fast.h>
  29
  30 void ucc_fast_dump_regs(struct ucc_fast_private * uccf)
  31 {
  32         printk(KERN_INFO "UCC%d Fast registers:", uccf->uf_info->ucc_num);
  33         printk(KERN_INFO "Base address: 0x%08x", (u32) uccf->uf_regs);
  34
  35         printk(KERN_INFO "gumr  : addr - 0x%08x, val - 0x%08x",
  36                   (u32) & uccf->uf_regs->gumr, in_be32(&uccf->uf_regs->gumr));
  37         printk(KERN_INFO "upsmr : addr - 0x%08x, val - 0x%08x",
  38                   (u32) & uccf->uf_regs->upsmr, in_be32(&uccf->uf_regs->upsmr));
  39         printk(KERN_INFO "utodr : addr - 0x%08x, val - 0x%04x",
  40                   (u32) & uccf->uf_regs->utodr, in_be16(&uccf->uf_regs->utodr));
  41         printk(KERN_INFO "udsr  : addr - 0x%08x, val - 0x%04x",
  42                   (u32) & uccf->uf_regs->udsr, in_be16(&uccf->uf_regs->udsr));
  43         printk(KERN_INFO "ucce  : addr - 0x%08x, val - 0x%08x",
  44                   (u32) & uccf->uf_regs->ucce, in_be32(&uccf->uf_regs->ucce));
  45         printk(KERN_INFO "uccm  : addr - 0x%08x, val - 0x%08x",
  46                   (u32) & uccf->uf_regs->uccm, in_be32(&uccf->uf_regs->uccm));
  47         printk(KERN_INFO "uccs  : addr - 0x%08x, val - 0x%02x",
  48                   (u32) & uccf->uf_regs->uccs, uccf->uf_regs->uccs);
  49         printk(KERN_INFO "urfb  : addr - 0x%08x, val - 0x%08x",
  50                   (u32) & uccf->uf_regs->urfb, in_be32(&uccf->uf_regs->urfb));
  51         printk(KERN_INFO "urfs  : addr - 0x%08x, val - 0x%04x",
  52                   (u32) & uccf->uf_regs->urfs, in_be16(&uccf->uf_regs->urfs));
  53         printk(KERN_INFO "urfet : addr - 0x%08x, val - 0x%04x",
  54                   (u32) & uccf->uf_regs->urfet, in_be16(&uccf->uf_regs->urfet));
  55         printk(KERN_INFO "urfset: addr - 0x%08x, val - 0x%04x",
  56                   (u32) & uccf->uf_regs->urfset,
  57                   in_be16(&uccf->uf_regs->urfset));
  58         printk(KERN_INFO "utfb  : addr - 0x%08x, val - 0x%08x",
  59                   (u32) & uccf->uf_regs->utfb, in_be32(&uccf->uf_regs->utfb));
  60         printk(KERN_INFO "utfs  : addr - 0x%08x, val - 0x%04x",
  61                   (u32) & uccf->uf_regs->utfs, in_be16(&uccf->uf_regs->utfs));
  62         printk(KERN_INFO "utfet : addr - 0x%08x, val - 0x%04x",
  63                   (u32) & uccf->uf_regs->utfet, in_be16(&uccf->uf_regs->utfet));
  64         printk(KERN_INFO "utftt : addr - 0x%08x, val - 0x%04x",
  65                   (u32) & uccf->uf_regs->utftt, in_be16(&uccf->uf_regs->utftt));
  66         printk(KERN_INFO "utpt  : addr - 0x%08x, val - 0x%04x",
  67                   (u32) & uccf->uf_regs->utpt, in_be16(&uccf->uf_regs->utpt));
  68         printk(KERN_INFO "urtry : addr - 0x%08x, val - 0x%08x",
  69                   (u32) & uccf->uf_regs->urtry, in_be32(&uccf->uf_regs->urtry));
  70         printk(KERN_INFO "guemr : addr - 0x%08x, val - 0x%02x",
  71                   (u32) & uccf->uf_regs->guemr, uccf->uf_regs->guemr);
  72 }
  73
  74 u32 ucc_fast_get_qe_cr_subblock(int uccf_num)
  75 {
  76         switch (uccf_num) {
  77         case 0: return QE_CR_SUBBLOCK_UCCFAST1;
  78         case 1: return QE_CR_SUBBLOCK_UCCFAST2;
  79         case 2: return QE_CR_SUBBLOCK_UCCFAST3;
  80         case 3: return QE_CR_SUBBLOCK_UCCFAST4;
  81         case 4: return QE_CR_SUBBLOCK_UCCFAST5;
  82         case 5: return QE_CR_SUBBLOCK_UCCFAST6;
  83         case 6: return QE_CR_SUBBLOCK_UCCFAST7;
  84         case 7: return QE_CR_SUBBLOCK_UCCFAST8;
  85         default: return QE_CR_SUBBLOCK_INVALID;
  86         }
  87 }
  88
  89 void ucc_fast_transmit_on_demand(struct ucc_fast_private * uccf)
  90 {
  91         out_be16(&uccf->uf_regs->utodr, UCC_FAST_TOD);
  92 }
  93
  94 void ucc_fast_enable(struct ucc_fast_private * uccf, enum comm_dir mode)
  95 {
  96         struct ucc_fast *uf_regs;
  97         u32 gumr;
  98
  99         uf_regs = uccf->uf_regs;
 100
 101         /* Enable reception and/or transmission on this UCC. */
 102         gumr = in_be32(&uf_regs->gumr);
 103         if (mode & COMM_DIR_TX) {
 104                 gumr |= UCC_FAST_GUMR_ENT;
 105                 uccf->enabled_tx = 1;
 106         }
 107         if (mode & COMM_DIR_RX) {
 108                 gumr |= UCC_FAST_GUMR_ENR;
 109                 uccf->enabled_rx = 1;
 110         }
 111         out_be32(&uf_regs->gumr, gumr);
 112 }
 113
 114 void ucc_fast_disable(struct ucc_fast_private * uccf, enum comm_dir mode)
 115 {
 116         struct ucc_fast *uf_regs;
 117         u32 gumr;
 118
 119         uf_regs = uccf->uf_regs;
 120
 121         /* Disable reception and/or transmission on this UCC. */
 122         gumr = in_be32(&uf_regs->gumr);
 123         if (mode & COMM_DIR_TX) {
 124                 gumr &= ~UCC_FAST_GUMR_ENT;
 125                 uccf->enabled_tx = 0;
 126         }
 127         if (mode & COMM_DIR_RX) {
 128                 gumr &= ~UCC_FAST_GUMR_ENR;
 129                 uccf->enabled_rx = 0;
 130         }
 131         out_be32(&uf_regs->gumr, gumr);
 132 }
 133
 134 int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** uccf_ret)
 135 {
 136         struct ucc_fast_private *uccf;
 137         struct ucc_fast *uf_regs;
 138         u32 gumr;
 139         int ret;
 140
 141         if (!uf_info)
 142                 return -EINVAL;
 143
 144         /* check if the UCC port number is in range. */
 145         if ((uf_info->ucc_num < 0) || (uf_info->ucc_num > UCC_MAX_NUM - 1)) {
 146                 printk(KERN_ERR "%s: illegal UCC number", __FUNCTION__);
 147                 return -EINVAL;
 148         }
 149
 150         /* Check that 'max_rx_buf_length' is properly aligned (4). */
 151         if (uf_info->max_rx_buf_length & (UCC_FAST_MRBLR_ALIGNMENT - 1)) {
 152                 printk(KERN_ERR "%s: max_rx_buf_length not aligned", __FUNCTION__);
 153                 return -EINVAL;
 154         }
 155
 156         /* Validate Virtual Fifo register values */
 157         if (uf_info->urfs < UCC_FAST_URFS_MIN_VAL) {
 158                 printk(KERN_ERR "%s: urfs is too small", __FUNCTION__);
 159                 return -EINVAL;
 160         }
 161
 162         if (uf_info->urfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 163                 printk(KERN_ERR "%s: urfs is not aligned", __FUNCTION__);
 164                 return -EINVAL;
 165         }
 166
 167         if (uf_info->urfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 168                 printk(KERN_ERR "%s: urfet is not aligned.", __FUNCTION__);
 169                 return -EINVAL;
 170         }
 171
 172         if (uf_info->urfset & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 173                 printk(KERN_ERR "%s: urfset is not aligned", __FUNCTION__);
 174                 return -EINVAL;
 175         }
 176
 177         if (uf_info->utfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 178                 printk(KERN_ERR "%s: utfs is not aligned", __FUNCTION__);
 179                 return -EINVAL;
 180         }
 181
 182         if (uf_info->utfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 183                 printk(KERN_ERR "%s: utfet is not aligned", __FUNCTION__);
 184                 return -EINVAL;
 185         }
 186
 187         if (uf_info->utftt & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 188                 printk(KERN_ERR "%s: utftt is not aligned", __FUNCTION__);
 189                 return -EINVAL;
 190         }
 191
 192         uccf = kzalloc(sizeof(struct ucc_fast_private), GFP_KERNEL);
 193         if (!uccf) {
 194                 printk(KERN_ERR "%s: Cannot allocate private data", __FUNCTION__);
 195                 return -ENOMEM;
 196         }
 197
 198         /* Fill fast UCC structure */
 199         uccf->uf_info = uf_info;
 200         /* Set the PHY base address */
 201         uccf->uf_regs = ioremap(uf_info->regs, sizeof(struct ucc_fast));
 202         if (uccf->uf_regs == NULL) {
 203                 printk(KERN_ERR "%s: Cannot map UCC registers", __FUNCTION__);
 204                 return -ENOMEM;
 205         }
 206
 207         uccf->enabled_tx = 0;
 208         uccf->enabled_rx = 0;
 209         uccf->stopped_tx = 0;
 210         uccf->stopped_rx = 0;
 211         uf_regs = uccf->uf_regs;
 212         uccf->p_ucce = (u32 *) & (uf_regs->ucce);
 213         uccf->p_uccm = (u32 *) & (uf_regs->uccm);
 214 #ifdef CONFIG_UGETH_TX_ON_DEMAND
 215         uccf->p_utodr = (u16 *) & (uf_regs->utodr);
 216 #endif
 217 #ifdef STATISTICS
 218         uccf->tx_frames = 0;
 219         uccf->rx_frames = 0;
 220         uccf->rx_discarded = 0;
 221 #endif                          /* STATISTICS */
 222
 223         /* Init Guemr register */
 224         if ((ret = ucc_init_guemr((struct ucc_common *) (uf_regs)))) {
 225                 printk(KERN_ERR "%s: cannot init GUEMR", __FUNCTION__);
 226                 ucc_fast_free(uccf);
 227                 return ret;
 228         }
 229
 230         /* Set UCC to fast type */
 231         if ((ret = ucc_set_type(uf_info->ucc_num,
 232                                 (struct ucc_common *) (uf_regs),
 233                                 UCC_SPEED_TYPE_FAST))) {
 234                 printk(KERN_ERR "%s: cannot set UCC type", __FUNCTION__);
 235                 ucc_fast_free(uccf);
 236                 return ret;
 237         }
 238
 239         uccf->mrblr = uf_info->max_rx_buf_length;
 240
 241         /* Set GUMR */
 242         /* For more details see the hardware spec. */
 243         gumr = uf_info->ttx_trx;
 244         if (uf_info->tci)
 245                 gumr |= UCC_FAST_GUMR_TCI;
 246         if (uf_info->cdp)
 247                 gumr |= UCC_FAST_GUMR_CDP;
 248         if (uf_info->ctsp)
 249                 gumr |= UCC_FAST_GUMR_CTSP;
 250         if (uf_info->cds)
 251                 gumr |= UCC_FAST_GUMR_CDS;
 252         if (uf_info->ctss)
 253                 gumr |= UCC_FAST_GUMR_CTSS;
 254         if (uf_info->txsy)
 255                 gumr |= UCC_FAST_GUMR_TXSY;
 256         if (uf_info->rsyn)
 257                 gumr |= UCC_FAST_GUMR_RSYN;
 258         gumr |= uf_info->synl;
 259         if (uf_info->rtsm)
 260                 gumr |= UCC_FAST_GUMR_RTSM;
 261         gumr |= uf_info->renc;
 262         if (uf_info->revd)
 263                 gumr |= UCC_FAST_GUMR_REVD;
 264         gumr |= uf_info->tenc;
 265         gumr |= uf_info->tcrc;
 266         gumr |= uf_info->mode;
 267         out_be32(&uf_regs->gumr, gumr);
 268
 269         /* Allocate memory for Tx Virtual Fifo */
 270         uccf->ucc_fast_tx_virtual_fifo_base_offset =
 271             qe_muram_alloc(uf_info->utfs, UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
 272         if (IS_ERR_VALUE(uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
 273                 printk(KERN_ERR "%s: cannot allocate MURAM for TX FIFO", __FUNCTION__);
 274                 uccf->ucc_fast_tx_virtual_fifo_base_offset = 0;
 275                 ucc_fast_free(uccf);
 276                 return -ENOMEM;
 277         }
 278
 279         /* Allocate memory for Rx Virtual Fifo */
 280         uccf->ucc_fast_rx_virtual_fifo_base_offset =
 281                 qe_muram_alloc(uf_info->urfs +
 282                            UCC_FAST_RECEIVE_VIRTUAL_FIFO_SIZE_FUDGE_FACTOR,
 283                            UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
 284         if (IS_ERR_VALUE(uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
 285                 printk(KERN_ERR "%s: cannot allocate MURAM for RX FIFO", __FUNCTION__);
 286                 uccf->ucc_fast_rx_virtual_fifo_base_offset = 0;
 287                 ucc_fast_free(uccf);
 288                 return -ENOMEM;
 289         }
 290
 291         /* Set Virtual Fifo registers */
 292         out_be16(&uf_regs->urfs, uf_info->urfs);
 293         out_be16(&uf_regs->urfet, uf_info->urfet);
 294         out_be16(&uf_regs->urfset, uf_info->urfset);
 295         out_be16(&uf_regs->utfs, uf_info->utfs);
 296         out_be16(&uf_regs->utfet, uf_info->utfet);
 297         out_be16(&uf_regs->utftt, uf_info->utftt);
 298         /* utfb, urfb are offsets from MURAM base */
 299         out_be32(&uf_regs->utfb, uccf->ucc_fast_tx_virtual_fifo_base_offset);
 300         out_be32(&uf_regs->urfb, uccf->ucc_fast_rx_virtual_fifo_base_offset);
 301
 302         /* Mux clocking */
 303         /* Grant Support */
 304         ucc_set_qe_mux_grant(uf_info->ucc_num, uf_info->grant_support);
 305         /* Breakpoint Support */
 306         ucc_set_qe_mux_bkpt(uf_info->ucc_num, uf_info->brkpt_support);
 307         /* Set Tsa or NMSI mode. */
 308         ucc_set_qe_mux_tsa(uf_info->ucc_num, uf_info->tsa);
 309         /* If NMSI (not Tsa), set Tx and Rx clock. */
 310         if (!uf_info->tsa) {
 311                 /* Rx clock routing */
 312                 if ((uf_info->rx_clock != QE_CLK_NONE) &&
 313                     ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->rx_clock,
 314                                         COMM_DIR_RX)) {
 315                         printk(KERN_ERR "%s: illegal value for RX clock",
 316                                __FUNCTION__);
 317                         ucc_fast_free(uccf);
 318                         return -EINVAL;
 319                 }
 320                 /* Tx clock routing */
 321                 if ((uf_info->tx_clock != QE_CLK_NONE) &&
 322                     ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->tx_clock,
 323                                         COMM_DIR_TX)) {
 324                         printk(KERN_ERR "%s: illegal value for TX clock",
 325                                __FUNCTION__);
 326                         ucc_fast_free(uccf);
 327                         return -EINVAL;
 328                 }
 329         }
 330
 331         /* Set interrupt mask register at UCC level. */
 332         out_be32(&uf_regs->uccm, uf_info->uccm_mask);
 333
 334         /* First, clear anything pending at UCC level,
 335          * otherwise, old garbage may come through
 336          * as soon as the dam is opened. */
 337
 338         /* Writing '1' clears */
 339         out_be32(&uf_regs->ucce, 0xffffffff);
 340
 341         *uccf_ret = uccf;
 342         return 0;
 343 }
 344
 345 void ucc_fast_free(struct ucc_fast_private * uccf)
 346 {
 347         if (!uccf)
 348                 return;
 349
 350         if (uccf->ucc_fast_tx_virtual_fifo_base_offset)
 351                 qe_muram_free(uccf->ucc_fast_tx_virtual_fifo_base_offset);
 352
 353         if (uccf->ucc_fast_rx_virtual_fifo_base_offset)
 354                 qe_muram_free(uccf->ucc_fast_rx_virtual_fifo_base_offset);
 355
 356         kfree(uccf);
 357 }