LXR uboot/drivers/net/fsl-mc/mc

   1/*
   2 * Freescale Layerscape MC I/O wrapper
   3 *
   4 * Copyright (C) 2013-2015 Freescale Semiconductor, Inc.
   5 * Author: German Rivera <German.Rivera@freescale.com>
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <fsl-mc/fsl_mc_sys.h>
  11#include <fsl-mc/fsl_mc_cmd.h>
  12#include <common.h>
  13#include <errno.h>
  14#include <asm/io.h>
  15
  16#define MC_CMD_HDR_READ_CMDID(_hdr) \
  17        ((uint16_t)mc_dec((_hdr), MC_CMD_HDR_CMDID_O, MC_CMD_HDR_CMDID_S))
  18
  19/**
  20 * mc_send_command - Send MC command and wait for response
  21 *
  22 * @mc_io: Pointer to MC I/O object to be used
  23 * @cmd: MC command buffer. On input, it contains the command to send to the MC.
  24 * On output, it contains the response from the MC if any.
  25 *
  26 * Depending on the sharing option specified when creating the MC portal
  27 * wrapper, this function will use a spinlock or mutex to ensure exclusive
  28 * access to the MC portal from the point when the command is sent until a
  29 * response is received from the MC.
  30 */
  31int mc_send_command(struct fsl_mc_io *mc_io,
  32                    struct mc_command *cmd)
  33{
  34        enum mc_cmd_status status;
  35        int timeout = 12000;
  36
  37        mc_write_command(mc_io->mmio_regs, cmd);
  38
  39        for ( ; ; ) {
  40                status = mc_read_response(mc_io->mmio_regs, cmd);
  41                if (status != MC_CMD_STATUS_READY)
  42                        break;
  43
  44                if (--timeout == 0) {
  45                        printf("Error: Timeout waiting for MC response\n");
  46                        return -ETIMEDOUT;
  47                }
  48
  49                udelay(500);
  50        }
  51
  52        if (status != MC_CMD_STATUS_OK) {
  53                printf("Error: MC command failed (portal: %p, obj handle: %#x, command: %#x, status: %#x)\n",
  54                       mc_io->mmio_regs,
  55                        (unsigned int)MC_CMD_HDR_READ_TOKEN(cmd->header),
  56                       (unsigned int)MC_CMD_HDR_READ_CMDID(cmd->header),
  57                       (unsigned int)status);
  58
  59                return -EIO;
  60        }
  61
  62        return 0;
  63}
  64