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ucc_fast.c

/*
 * Copyright (C) 2006 Freescale Semicondutor, Inc. All rights reserved.
 *
 * Authors:       Shlomi Gridish <gridish@freescale.com>
 *          Li Yang <leoli@freescale.com>
 *
 * Description:
 * QE UCC Fast API Set - UCC Fast specific routines implementations.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/stddef.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/module.h>

#include <asm/io.h>
#include <asm/immap_qe.h>
#include <asm/qe.h>

#include <asm/ucc.h>
#include <asm/ucc_fast.h>

void ucc_fast_dump_regs(struct ucc_fast_private * uccf)
{
      printk(KERN_INFO "UCC%u Fast registers:\n", uccf->uf_info->ucc_num);
      printk(KERN_INFO "Base address: 0x%p\n", uccf->uf_regs);

      printk(KERN_INFO "gumr  : addr=0x%p, val=0x%08x\n",
              &uccf->uf_regs->gumr, in_be32(&uccf->uf_regs->gumr));
      printk(KERN_INFO "upsmr : addr=0x%p, val=0x%08x\n",
              &uccf->uf_regs->upsmr, in_be32(&uccf->uf_regs->upsmr));
      printk(KERN_INFO "utodr : addr=0x%p, val=0x%04x\n",
              &uccf->uf_regs->utodr, in_be16(&uccf->uf_regs->utodr));
      printk(KERN_INFO "udsr  : addr=0x%p, val=0x%04x\n",
              &uccf->uf_regs->udsr, in_be16(&uccf->uf_regs->udsr));
      printk(KERN_INFO "ucce  : addr=0x%p, val=0x%08x\n",
              &uccf->uf_regs->ucce, in_be32(&uccf->uf_regs->ucce));
      printk(KERN_INFO "uccm  : addr=0x%p, val=0x%08x\n",
              &uccf->uf_regs->uccm, in_be32(&uccf->uf_regs->uccm));
      printk(KERN_INFO "uccs  : addr=0x%p, val=0x%02x\n",
              &uccf->uf_regs->uccs, in_8(&uccf->uf_regs->uccs));
      printk(KERN_INFO "urfb  : addr=0x%p, val=0x%08x\n",
              &uccf->uf_regs->urfb, in_be32(&uccf->uf_regs->urfb));
      printk(KERN_INFO "urfs  : addr=0x%p, val=0x%04x\n",
              &uccf->uf_regs->urfs, in_be16(&uccf->uf_regs->urfs));
      printk(KERN_INFO "urfet : addr=0x%p, val=0x%04x\n",
              &uccf->uf_regs->urfet, in_be16(&uccf->uf_regs->urfet));
      printk(KERN_INFO "urfset: addr=0x%p, val=0x%04x\n",
              &uccf->uf_regs->urfset, in_be16(&uccf->uf_regs->urfset));
      printk(KERN_INFO "utfb  : addr=0x%p, val=0x%08x\n",
              &uccf->uf_regs->utfb, in_be32(&uccf->uf_regs->utfb));
      printk(KERN_INFO "utfs  : addr=0x%p, val=0x%04x\n",
              &uccf->uf_regs->utfs, in_be16(&uccf->uf_regs->utfs));
      printk(KERN_INFO "utfet : addr=0x%p, val=0x%04x\n",
              &uccf->uf_regs->utfet, in_be16(&uccf->uf_regs->utfet));
      printk(KERN_INFO "utftt : addr=0x%p, val=0x%04x\n",
              &uccf->uf_regs->utftt, in_be16(&uccf->uf_regs->utftt));
      printk(KERN_INFO "utpt  : addr=0x%p, val=0x%04x\n",
              &uccf->uf_regs->utpt, in_be16(&uccf->uf_regs->utpt));
      printk(KERN_INFO "urtry : addr=0x%p, val=0x%08x\n",
              &uccf->uf_regs->urtry, in_be32(&uccf->uf_regs->urtry));
      printk(KERN_INFO "guemr : addr=0x%p, val=0x%02x\n",
              &uccf->uf_regs->guemr, in_8(&uccf->uf_regs->guemr));
}
EXPORT_SYMBOL(ucc_fast_dump_regs);

u32 ucc_fast_get_qe_cr_subblock(int uccf_num)
{
      switch (uccf_num) {
      case 0: return QE_CR_SUBBLOCK_UCCFAST1;
      case 1: return QE_CR_SUBBLOCK_UCCFAST2;
      case 2: return QE_CR_SUBBLOCK_UCCFAST3;
      case 3: return QE_CR_SUBBLOCK_UCCFAST4;
      case 4: return QE_CR_SUBBLOCK_UCCFAST5;
      case 5: return QE_CR_SUBBLOCK_UCCFAST6;
      case 6: return QE_CR_SUBBLOCK_UCCFAST7;
      case 7: return QE_CR_SUBBLOCK_UCCFAST8;
      default: return QE_CR_SUBBLOCK_INVALID;
      }
}
EXPORT_SYMBOL(ucc_fast_get_qe_cr_subblock);

void ucc_fast_transmit_on_demand(struct ucc_fast_private * uccf)
{
      out_be16(&uccf->uf_regs->utodr, UCC_FAST_TOD);
}
EXPORT_SYMBOL(ucc_fast_transmit_on_demand);

void ucc_fast_enable(struct ucc_fast_private * uccf, enum comm_dir mode)
{
      struct ucc_fast __iomem *uf_regs;
      u32 gumr;

      uf_regs = uccf->uf_regs;

      /* Enable reception and/or transmission on this UCC. */
      gumr = in_be32(&uf_regs->gumr);
      if (mode & COMM_DIR_TX) {
            gumr |= UCC_FAST_GUMR_ENT;
            uccf->enabled_tx = 1;
      }
      if (mode & COMM_DIR_RX) {
            gumr |= UCC_FAST_GUMR_ENR;
            uccf->enabled_rx = 1;
      }
      out_be32(&uf_regs->gumr, gumr);
}
EXPORT_SYMBOL(ucc_fast_enable);

void ucc_fast_disable(struct ucc_fast_private * uccf, enum comm_dir mode)
{
      struct ucc_fast __iomem *uf_regs;
      u32 gumr;

      uf_regs = uccf->uf_regs;

      /* Disable reception and/or transmission on this UCC. */
      gumr = in_be32(&uf_regs->gumr);
      if (mode & COMM_DIR_TX) {
            gumr &= ~UCC_FAST_GUMR_ENT;
            uccf->enabled_tx = 0;
      }
      if (mode & COMM_DIR_RX) {
            gumr &= ~UCC_FAST_GUMR_ENR;
            uccf->enabled_rx = 0;
      }
      out_be32(&uf_regs->gumr, gumr);
}
EXPORT_SYMBOL(ucc_fast_disable);

int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** uccf_ret)
{
      struct ucc_fast_private *uccf;
      struct ucc_fast __iomem *uf_regs;
      u32 gumr;
      int ret;

      if (!uf_info)
            return -EINVAL;

      /* check if the UCC port number is in range. */
      if ((uf_info->ucc_num < 0) || (uf_info->ucc_num > UCC_MAX_NUM - 1)) {
            printk(KERN_ERR "%s: illegal UCC number\n", __func__);
            return -EINVAL;
      }

      /* Check that 'max_rx_buf_length' is properly aligned (4). */
      if (uf_info->max_rx_buf_length & (UCC_FAST_MRBLR_ALIGNMENT - 1)) {
            printk(KERN_ERR "%s: max_rx_buf_length not aligned\n",
                  __func__);
            return -EINVAL;
      }

      /* Validate Virtual Fifo register values */
      if (uf_info->urfs < UCC_FAST_URFS_MIN_VAL) {
            printk(KERN_ERR "%s: urfs is too small\n", __func__);
            return -EINVAL;
      }

      if (uf_info->urfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
            printk(KERN_ERR "%s: urfs is not aligned\n", __func__);
            return -EINVAL;
      }

      if (uf_info->urfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
            printk(KERN_ERR "%s: urfet is not aligned.\n", __func__);
            return -EINVAL;
      }

      if (uf_info->urfset & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
            printk(KERN_ERR "%s: urfset is not aligned\n", __func__);
            return -EINVAL;
      }

      if (uf_info->utfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
            printk(KERN_ERR "%s: utfs is not aligned\n", __func__);
            return -EINVAL;
      }

      if (uf_info->utfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
            printk(KERN_ERR "%s: utfet is not aligned\n", __func__);
            return -EINVAL;
      }

      if (uf_info->utftt & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
            printk(KERN_ERR "%s: utftt is not aligned\n", __func__);
            return -EINVAL;
      }

      uccf = kzalloc(sizeof(struct ucc_fast_private), GFP_KERNEL);
      if (!uccf) {
            printk(KERN_ERR "%s: Cannot allocate private data\n",
                  __func__);
            return -ENOMEM;
      }

      /* Fill fast UCC structure */
      uccf->uf_info = uf_info;
      /* Set the PHY base address */
      uccf->uf_regs = ioremap(uf_info->regs, sizeof(struct ucc_fast));
      if (uccf->uf_regs == NULL) {
            printk(KERN_ERR "%s: Cannot map UCC registers\n", __func__);
            kfree(uccf);
            return -ENOMEM;
      }

      uccf->enabled_tx = 0;
      uccf->enabled_rx = 0;
      uccf->stopped_tx = 0;
      uccf->stopped_rx = 0;
      uf_regs = uccf->uf_regs;
      uccf->p_ucce = &uf_regs->ucce;
      uccf->p_uccm = &uf_regs->uccm;
#ifdef CONFIG_UGETH_TX_ON_DEMAND
      uccf->p_utodr = &uf_regs->utodr;
#endif
#ifdef STATISTICS
      uccf->tx_frames = 0;
      uccf->rx_frames = 0;
      uccf->rx_discarded = 0;
#endif                        /* STATISTICS */

      /* Set UCC to fast type */
      ret = ucc_set_type(uf_info->ucc_num, UCC_SPEED_TYPE_FAST);
      if (ret) {
            printk(KERN_ERR "%s: cannot set UCC type\n", __func__);
            ucc_fast_free(uccf);
            return ret;
      }

      uccf->mrblr = uf_info->max_rx_buf_length;

      /* Set GUMR */
      /* For more details see the hardware spec. */
      gumr = uf_info->ttx_trx;
      if (uf_info->tci)
            gumr |= UCC_FAST_GUMR_TCI;
      if (uf_info->cdp)
            gumr |= UCC_FAST_GUMR_CDP;
      if (uf_info->ctsp)
            gumr |= UCC_FAST_GUMR_CTSP;
      if (uf_info->cds)
            gumr |= UCC_FAST_GUMR_CDS;
      if (uf_info->ctss)
            gumr |= UCC_FAST_GUMR_CTSS;
      if (uf_info->txsy)
            gumr |= UCC_FAST_GUMR_TXSY;
      if (uf_info->rsyn)
            gumr |= UCC_FAST_GUMR_RSYN;
      gumr |= uf_info->synl;
      if (uf_info->rtsm)
            gumr |= UCC_FAST_GUMR_RTSM;
      gumr |= uf_info->renc;
      if (uf_info->revd)
            gumr |= UCC_FAST_GUMR_REVD;
      gumr |= uf_info->tenc;
      gumr |= uf_info->tcrc;
      gumr |= uf_info->mode;
      out_be32(&uf_regs->gumr, gumr);

      /* Allocate memory for Tx Virtual Fifo */
      uccf->ucc_fast_tx_virtual_fifo_base_offset =
          qe_muram_alloc(uf_info->utfs, UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
      if (IS_ERR_VALUE(uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
            printk(KERN_ERR "%s: cannot allocate MURAM for TX FIFO\n",
                  __func__);
            uccf->ucc_fast_tx_virtual_fifo_base_offset = 0;
            ucc_fast_free(uccf);
            return -ENOMEM;
      }

      /* Allocate memory for Rx Virtual Fifo */
      uccf->ucc_fast_rx_virtual_fifo_base_offset =
            qe_muram_alloc(uf_info->urfs +
                     UCC_FAST_RECEIVE_VIRTUAL_FIFO_SIZE_FUDGE_FACTOR,
                     UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
      if (IS_ERR_VALUE(uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
            printk(KERN_ERR "%s: cannot allocate MURAM for RX FIFO\n",
                  __func__);
            uccf->ucc_fast_rx_virtual_fifo_base_offset = 0;
            ucc_fast_free(uccf);
            return -ENOMEM;
      }

      /* Set Virtual Fifo registers */
      out_be16(&uf_regs->urfs, uf_info->urfs);
      out_be16(&uf_regs->urfet, uf_info->urfet);
      out_be16(&uf_regs->urfset, uf_info->urfset);
      out_be16(&uf_regs->utfs, uf_info->utfs);
      out_be16(&uf_regs->utfet, uf_info->utfet);
      out_be16(&uf_regs->utftt, uf_info->utftt);
      /* utfb, urfb are offsets from MURAM base */
      out_be32(&uf_regs->utfb, uccf->ucc_fast_tx_virtual_fifo_base_offset);
      out_be32(&uf_regs->urfb, uccf->ucc_fast_rx_virtual_fifo_base_offset);

      /* Mux clocking */
      /* Grant Support */
      ucc_set_qe_mux_grant(uf_info->ucc_num, uf_info->grant_support);
      /* Breakpoint Support */
      ucc_set_qe_mux_bkpt(uf_info->ucc_num, uf_info->brkpt_support);
      /* Set Tsa or NMSI mode. */
      ucc_set_qe_mux_tsa(uf_info->ucc_num, uf_info->tsa);
      /* If NMSI (not Tsa), set Tx and Rx clock. */
      if (!uf_info->tsa) {
            /* Rx clock routing */
            if ((uf_info->rx_clock != QE_CLK_NONE) &&
                ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->rx_clock,
                              COMM_DIR_RX)) {
                  printk(KERN_ERR "%s: illegal value for RX clock\n",
                         __func__);
                  ucc_fast_free(uccf);
                  return -EINVAL;
            }
            /* Tx clock routing */
            if ((uf_info->tx_clock != QE_CLK_NONE) &&
                ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->tx_clock,
                              COMM_DIR_TX)) {
                  printk(KERN_ERR "%s: illegal value for TX clock\n",
                         __func__);
                  ucc_fast_free(uccf);
                  return -EINVAL;
            }
      }

      /* Set interrupt mask register at UCC level. */
      out_be32(&uf_regs->uccm, uf_info->uccm_mask);

      /* First, clear anything pending at UCC level,
       * otherwise, old garbage may come through
       * as soon as the dam is opened. */

      /* Writing '1' clears */
      out_be32(&uf_regs->ucce, 0xffffffff);

      *uccf_ret = uccf;
      return 0;
}
EXPORT_SYMBOL(ucc_fast_init);

void ucc_fast_free(struct ucc_fast_private * uccf)
{
      if (!uccf)
            return;

      if (uccf->ucc_fast_tx_virtual_fifo_base_offset)
            qe_muram_free(uccf->ucc_fast_tx_virtual_fifo_base_offset);

      if (uccf->ucc_fast_rx_virtual_fifo_base_offset)
            qe_muram_free(uccf->ucc_fast_rx_virtual_fifo_base_offset);

      if (uccf->uf_regs)
            iounmap(uccf->uf_regs);

      kfree(uccf);
}
EXPORT_SYMBOL(ucc_fast_free);

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