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 #include <linux/module.h>
  23
  24 #include <asm/io.h>
  25 #include <asm/immap_qe.h>
  26 #include <asm/qe.h>
  27
  28 #include <asm/ucc.h>
  29 #include <asm/ucc_fast.h>
  30
  31 void ucc_fast_dump_regs(struct ucc_fast_private * uccf)
  32 {
  33         printk(KERN_INFO "UCC%u Fast registers:\n", uccf->uf_info->ucc_num);
  34         printk(KERN_INFO "Base address: 0x%p\n", uccf->uf_regs);
  35
  36         printk(KERN_INFO "gumr  : addr=0x%p, val=0x%08x\n",
  37                   &uccf->uf_regs->gumr, in_be32(&uccf->uf_regs->gumr));
  38         printk(KERN_INFO "upsmr : addr=0x%p, val=0x%08x\n",
  39                   &uccf->uf_regs->upsmr, in_be32(&uccf->uf_regs->upsmr));
  40         printk(KERN_INFO "utodr : addr=0x%p, val=0x%04x\n",
  41                   &uccf->uf_regs->utodr, in_be16(&uccf->uf_regs->utodr));
  42         printk(KERN_INFO "udsr  : addr=0x%p, val=0x%04x\n",
  43                   &uccf->uf_regs->udsr, in_be16(&uccf->uf_regs->udsr));
  44         printk(KERN_INFO "ucce  : addr=0x%p, val=0x%08x\n",
  45                   &uccf->uf_regs->ucce, in_be32(&uccf->uf_regs->ucce));
  46         printk(KERN_INFO "uccm  : addr=0x%p, val=0x%08x\n",
  47                   &uccf->uf_regs->uccm, in_be32(&uccf->uf_regs->uccm));
  48         printk(KERN_INFO "uccs  : addr=0x%p, val=0x%02x\n",
  49                   &uccf->uf_regs->uccs, uccf->uf_regs->uccs);
  50         printk(KERN_INFO "urfb  : addr=0x%p, val=0x%08x\n",
  51                   &uccf->uf_regs->urfb, in_be32(&uccf->uf_regs->urfb));
  52         printk(KERN_INFO "urfs  : addr=0x%p, val=0x%04x\n",
  53                   &uccf->uf_regs->urfs, in_be16(&uccf->uf_regs->urfs));
  54         printk(KERN_INFO "urfet : addr=0x%p, val=0x%04x\n",
  55                   &uccf->uf_regs->urfet, in_be16(&uccf->uf_regs->urfet));
  56         printk(KERN_INFO "urfset: addr=0x%p, val=0x%04x\n",
  57                   &uccf->uf_regs->urfset, in_be16(&uccf->uf_regs->urfset));
  58         printk(KERN_INFO "utfb  : addr=0x%p, val=0x%08x\n",
  59                   &uccf->uf_regs->utfb, in_be32(&uccf->uf_regs->utfb));
  60         printk(KERN_INFO "utfs  : addr=0x%p, val=0x%04x\n",
  61                   &uccf->uf_regs->utfs, in_be16(&uccf->uf_regs->utfs));
  62         printk(KERN_INFO "utfet : addr=0x%p, val=0x%04x\n",
  63                   &uccf->uf_regs->utfet, in_be16(&uccf->uf_regs->utfet));
  64         printk(KERN_INFO "utftt : addr=0x%p, val=0x%04x\n",
  65                   &uccf->uf_regs->utftt, in_be16(&uccf->uf_regs->utftt));
  66         printk(KERN_INFO "utpt  : addr=0x%p, val=0x%04x\n",
  67                   &uccf->uf_regs->utpt, in_be16(&uccf->uf_regs->utpt));
  68         printk(KERN_INFO "urtry : addr=0x%p, val=0x%08x\n",
  69                   &uccf->uf_regs->urtry, in_be32(&uccf->uf_regs->urtry));
  70         printk(KERN_INFO "guemr : addr=0x%p, val=0x%02x\n",
  71                   &uccf->uf_regs->guemr, uccf->uf_regs->guemr);
  72 }
  73 EXPORT_SYMBOL(ucc_fast_dump_regs);
  74
  75 u32 ucc_fast_get_qe_cr_subblock(int uccf_num)
  76 {
  77         switch (uccf_num) {
  78         case 0: return QE_CR_SUBBLOCK_UCCFAST1;
  79         case 1: return QE_CR_SUBBLOCK_UCCFAST2;
  80         case 2: return QE_CR_SUBBLOCK_UCCFAST3;
  81         case 3: return QE_CR_SUBBLOCK_UCCFAST4;
  82         case 4: return QE_CR_SUBBLOCK_UCCFAST5;
  83         case 5: return QE_CR_SUBBLOCK_UCCFAST6;
  84         case 6: return QE_CR_SUBBLOCK_UCCFAST7;
  85         case 7: return QE_CR_SUBBLOCK_UCCFAST8;
  86         default: return QE_CR_SUBBLOCK_INVALID;
  87         }
  88 }
  89 EXPORT_SYMBOL(ucc_fast_get_qe_cr_subblock);
  90
  91 void ucc_fast_transmit_on_demand(struct ucc_fast_private * uccf)
  92 {
  93         out_be16(&uccf->uf_regs->utodr, UCC_FAST_TOD);
  94 }
  95 EXPORT_SYMBOL(ucc_fast_transmit_on_demand);
  96
  97 void ucc_fast_enable(struct ucc_fast_private * uccf, enum comm_dir mode)
  98 {
  99         struct ucc_fast *uf_regs;
 100         u32 gumr;
 101
 102         uf_regs = uccf->uf_regs;
 103
 104         /* Enable reception and/or transmission on this UCC. */
 105         gumr = in_be32(&uf_regs->gumr);
 106         if (mode & COMM_DIR_TX) {
 107                 gumr |= UCC_FAST_GUMR_ENT;
 108                 uccf->enabled_tx = 1;
 109         }
 110         if (mode & COMM_DIR_RX) {
 111                 gumr |= UCC_FAST_GUMR_ENR;
 112                 uccf->enabled_rx = 1;
 113         }
 114         out_be32(&uf_regs->gumr, gumr);
 115 }
 116 EXPORT_SYMBOL(ucc_fast_enable);
 117
 118 void ucc_fast_disable(struct ucc_fast_private * uccf, enum comm_dir mode)
 119 {
 120         struct ucc_fast *uf_regs;
 121         u32 gumr;
 122
 123         uf_regs = uccf->uf_regs;
 124
 125         /* Disable reception and/or transmission on this UCC. */
 126         gumr = in_be32(&uf_regs->gumr);
 127         if (mode & COMM_DIR_TX) {
 128                 gumr &= ~UCC_FAST_GUMR_ENT;
 129                 uccf->enabled_tx = 0;
 130         }
 131         if (mode & COMM_DIR_RX) {
 132                 gumr &= ~UCC_FAST_GUMR_ENR;
 133                 uccf->enabled_rx = 0;
 134         }
 135         out_be32(&uf_regs->gumr, gumr);
 136 }
 137 EXPORT_SYMBOL(ucc_fast_disable);
 138
 139 int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** uccf_ret)
 140 {
 141         struct ucc_fast_private *uccf;
 142         struct ucc_fast *uf_regs;
 143         u32 gumr;
 144         int ret;
 145
 146         if (!uf_info)
 147                 return -EINVAL;
 148
 149         /* check if the UCC port number is in range. */
 150         if ((uf_info->ucc_num < 0) || (uf_info->ucc_num > UCC_MAX_NUM - 1)) {
 151                 printk(KERN_ERR "%s: illegal UCC number\n", __func__);
 152                 return -EINVAL;
 153         }
 154
 155         /* Check that 'max_rx_buf_length' is properly aligned (4). */
 156         if (uf_info->max_rx_buf_length & (UCC_FAST_MRBLR_ALIGNMENT - 1)) {
 157                 printk(KERN_ERR "%s: max_rx_buf_length not aligned\n",
 158                         __func__);
 159                 return -EINVAL;
 160         }
 161
 162         /* Validate Virtual Fifo register values */
 163         if (uf_info->urfs < UCC_FAST_URFS_MIN_VAL) {
 164                 printk(KERN_ERR "%s: urfs is too small\n", __func__);
 165                 return -EINVAL;
 166         }
 167
 168         if (uf_info->urfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 169                 printk(KERN_ERR "%s: urfs is not aligned\n", __func__);
 170                 return -EINVAL;
 171         }
 172
 173         if (uf_info->urfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 174                 printk(KERN_ERR "%s: urfet is not aligned.\n", __func__);
 175                 return -EINVAL;
 176         }
 177
 178         if (uf_info->urfset & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 179                 printk(KERN_ERR "%s: urfset is not aligned\n", __func__);
 180                 return -EINVAL;
 181         }
 182
 183         if (uf_info->utfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 184                 printk(KERN_ERR "%s: utfs is not aligned\n", __func__);
 185                 return -EINVAL;
 186         }
 187
 188         if (uf_info->utfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 189                 printk(KERN_ERR "%s: utfet is not aligned\n", __func__);
 190                 return -EINVAL;
 191         }
 192
 193         if (uf_info->utftt & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 194                 printk(KERN_ERR "%s: utftt is not aligned\n", __func__);
 195                 return -EINVAL;
 196         }
 197
 198         uccf = kzalloc(sizeof(struct ucc_fast_private), GFP_KERNEL);
 199         if (!uccf) {
 200                 printk(KERN_ERR "%s: Cannot allocate private data\n",
 201                         __func__);
 202                 return -ENOMEM;
 203         }
 204
 205         /* Fill fast UCC structure */
 206         uccf->uf_info = uf_info;
 207         /* Set the PHY base address */
 208         uccf->uf_regs = ioremap(uf_info->regs, sizeof(struct ucc_fast));
 209         if (uccf->uf_regs == NULL) {
 210                 printk(KERN_ERR "%s: Cannot map UCC registers\n", __func__);
 211                 return -ENOMEM;
 212         }
 213
 214         uccf->enabled_tx = 0;
 215         uccf->enabled_rx = 0;
 216         uccf->stopped_tx = 0;
 217         uccf->stopped_rx = 0;
 218         uf_regs = uccf->uf_regs;
 219         uccf->p_ucce = (u32 *) & (uf_regs->ucce);
 220         uccf->p_uccm = (u32 *) & (uf_regs->uccm);
 221 #ifdef CONFIG_UGETH_TX_ON_DEMAND
 222         uccf->p_utodr = (u16 *) & (uf_regs->utodr);
 223 #endif
 224 #ifdef STATISTICS
 225         uccf->tx_frames = 0;
 226         uccf->rx_frames = 0;
 227         uccf->rx_discarded = 0;
 228 #endif                          /* STATISTICS */
 229
 230         /* Set UCC to fast type */
 231         ret = ucc_set_type(uf_info->ucc_num, UCC_SPEED_TYPE_FAST);
 232         if (ret) {
 233                 printk(KERN_ERR "%s: cannot set UCC type\n", __func__);
 234                 ucc_fast_free(uccf);
 235                 return ret;
 236         }
 237
 238         uccf->mrblr = uf_info->max_rx_buf_length;
 239
 240         /* Set GUMR */
 241         /* For more details see the hardware spec. */
 242         gumr = uf_info->ttx_trx;
 243         if (uf_info->tci)
 244                 gumr |= UCC_FAST_GUMR_TCI;
 245         if (uf_info->cdp)
 246                 gumr |= UCC_FAST_GUMR_CDP;
 247         if (uf_info->ctsp)
 248                 gumr |= UCC_FAST_GUMR_CTSP;
 249         if (uf_info->cds)
 250                 gumr |= UCC_FAST_GUMR_CDS;
 251         if (uf_info->ctss)
 252                 gumr |= UCC_FAST_GUMR_CTSS;
 253         if (uf_info->txsy)
 254                 gumr |= UCC_FAST_GUMR_TXSY;
 255         if (uf_info->rsyn)
 256                 gumr |= UCC_FAST_GUMR_RSYN;
 257         gumr |= uf_info->synl;
 258         if (uf_info->rtsm)
 259                 gumr |= UCC_FAST_GUMR_RTSM;
 260         gumr |= uf_info->renc;
 261         if (uf_info->revd)
 262                 gumr |= UCC_FAST_GUMR_REVD;
 263         gumr |= uf_info->tenc;
 264         gumr |= uf_info->tcrc;
 265         gumr |= uf_info->mode;
 266         out_be32(&uf_regs->gumr, gumr);
 267
 268         /* Allocate memory for Tx Virtual Fifo */
 269         uccf->ucc_fast_tx_virtual_fifo_base_offset =
 270             qe_muram_alloc(uf_info->utfs, UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
 271         if (IS_ERR_VALUE(uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
 272                 printk(KERN_ERR "%s: cannot allocate MURAM for TX FIFO\n",
 273                         __func__);
 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\n",
 286                         __func__);
 287                 uccf->ucc_fast_rx_virtual_fifo_base_offset = 0;
 288                 ucc_fast_free(uccf);
 289                 return -ENOMEM;
 290         }
 291
 292         /* Set Virtual Fifo registers */
 293         out_be16(&uf_regs->urfs, uf_info->urfs);
 294         out_be16(&uf_regs->urfet, uf_info->urfet);
 295         out_be16(&uf_regs->urfset, uf_info->urfset);
 296         out_be16(&uf_regs->utfs, uf_info->utfs);
 297         out_be16(&uf_regs->utfet, uf_info->utfet);
 298         out_be16(&uf_regs->utftt, uf_info->utftt);
 299         /* utfb, urfb are offsets from MURAM base */
 300         out_be32(&uf_regs->utfb, uccf->ucc_fast_tx_virtual_fifo_base_offset);
 301         out_be32(&uf_regs->urfb, uccf->ucc_fast_rx_virtual_fifo_base_offset);
 302
 303         /* Mux clocking */
 304         /* Grant Support */
 305         ucc_set_qe_mux_grant(uf_info->ucc_num, uf_info->grant_support);
 306         /* Breakpoint Support */
 307         ucc_set_qe_mux_bkpt(uf_info->ucc_num, uf_info->brkpt_support);
 308         /* Set Tsa or NMSI mode. */
 309         ucc_set_qe_mux_tsa(uf_info->ucc_num, uf_info->tsa);
 310         /* If NMSI (not Tsa), set Tx and Rx clock. */
 311         if (!uf_info->tsa) {
 312                 /* Rx clock routing */
 313                 if ((uf_info->rx_clock != QE_CLK_NONE) &&
 314                     ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->rx_clock,
 315                                         COMM_DIR_RX)) {
 316                         printk(KERN_ERR "%s: illegal value for RX clock\n",
 317                                __func__);
 318                         ucc_fast_free(uccf);
 319                         return -EINVAL;
 320                 }
 321                 /* Tx clock routing */
 322                 if ((uf_info->tx_clock != QE_CLK_NONE) &&
 323                     ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->tx_clock,
 324                                         COMM_DIR_TX)) {
 325                         printk(KERN_ERR "%s: illegal value for TX clock\n",
 326                                __func__);
 327                         ucc_fast_free(uccf);
 328                         return -EINVAL;
 329                 }
 330         }
 331
 332         /* Set interrupt mask register at UCC level. */
 333         out_be32(&uf_regs->uccm, uf_info->uccm_mask);
 334
 335         /* First, clear anything pending at UCC level,
 336          * otherwise, old garbage may come through
 337          * as soon as the dam is opened. */
 338
 339         /* Writing '1' clears */
 340         out_be32(&uf_regs->ucce, 0xffffffff);
 341
 342         *uccf_ret = uccf;
 343         return 0;
 344 }
 345 EXPORT_SYMBOL(ucc_fast_init);
 346
 347 void ucc_fast_free(struct ucc_fast_private * uccf)
 348 {
 349         if (!uccf)
 350                 return;
 351
 352         if (uccf->ucc_fast_tx_virtual_fifo_base_offset)
 353                 qe_muram_free(uccf->ucc_fast_tx_virtual_fifo_base_offset);
 354
 355         if (uccf->ucc_fast_rx_virtual_fifo_base_offset)
 356                 qe_muram_free(uccf->ucc_fast_rx_virtual_fifo_base_offset);
 357
 358         kfree(uccf);
 359 }
 360 EXPORT_SYMBOL(ucc_fast_free);