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// SPDX-License-Identifier: GPL-2.0+
/*
* Freescale Layerscape MC I/O wrapper
*
* Copyright (C) 2013-2015 Freescale Semiconductor, Inc.
* Author: German Rivera <German.Rivera@freescale.com>
*/
#include <fsl-mc/fsl_mc_sys.h>
#include <fsl-mc/fsl_mc_cmd.h>
#include <common.h>
#include <errno.h>
#include <asm/io.h>
#include <linux/delay.h>
#define MC_CMD_HDR_READ_CMDID(_hdr) \
((uint16_t)mc_dec((_hdr), MC_CMD_HDR_CMDID_O, MC_CMD_HDR_CMDID_S))
/**
* mc_send_command - Send MC command and wait for response
*
* @mc_io: Pointer to MC I/O object to be used
* @cmd: MC command buffer. On input, it contains the command to send to the MC.
* On output, it contains the response from the MC if any.
*
* Depending on the sharing option specified when creating the MC portal
* wrapper, this function will use a spinlock or mutex to ensure exclusive
* access to the MC portal from the point when the command is sent until a
* response is received from the MC.
*/
int mc_send_command(struct fsl_mc_io *mc_io,
struct mc_command *cmd)
{
enum mc_cmd_status status;
int timeout = 12000;
mc_write_command(mc_io->mmio_regs, cmd);
for ( ; ; ) {
status = mc_read_response(mc_io->mmio_regs, cmd);
if (status != MC_CMD_STATUS_READY)
break;
if (--timeout == 0) {
printf("Error: Timeout waiting for MC response\n");
return -ETIMEDOUT;
}
udelay(500);
}
if (status != MC_CMD_STATUS_OK) {
printf("Error: MC command failed (portal: %p, obj handle: %#x, command: %#x, status: %#x)\n",
mc_io->mmio_regs,
(unsigned int)MC_CMD_HDR_READ_TOKEN(cmd->header),
(unsigned int)MC_CMD_HDR_READ_CMDID(cmd->header),
(unsigned int)status);
return -EIO;
}
return 0;
}
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