drivers/fpga/intel_sdm_mb.c - github/trini/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2018 Intel Corporation <www.intel.com>
  */

 #include <altera.h>
 #include <log.h>
 #include <time.h>
 #include <watchdog.h>
 #include <asm/arch/mailbox_s10.h>
 #include <asm/arch/smc_api.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/intel-smc.h>
 #include <linux/string.h>

 #define RECONFIG_STATUS_POLL_RESP_TIMEOUT_MS		60000
 #define RECONFIG_STATUS_INTERVAL_DELAY_US		1000000

 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_ATF)

 #define BITSTREAM_CHUNK_SIZE				0xFFFF0
 #define RECONFIG_STATUS_POLL_RETRY_MAX			100

 /*
  * Polling the FPGA configuration status.
  * Return 0 for success, non-zero for error.
  */
 static int reconfig_status_polling_resp(void)
 {
 	int ret;
 	unsigned long start = get_timer(0);

 	while (1) {
 		ret = invoke_smc(INTEL_SIP_SMC_FPGA_CONFIG_ISDONE, NULL, 0,
 				 NULL, 0);

 		if (!ret)
 			return 0;	/* configuration success */

 		if (ret != INTEL_SIP_SMC_STATUS_BUSY)
 			return ret;

 		if (get_timer(start) > RECONFIG_STATUS_POLL_RESP_TIMEOUT_MS)
 			return -ETIMEDOUT;	/* time out */

 		puts(".");
 		udelay(RECONFIG_STATUS_INTERVAL_DELAY_US);
 		schedule();
 	}

 	return -ETIMEDOUT;
 }

 static int send_bitstream(const void *rbf_data, size_t rbf_size)
 {
 	int i;
 	u64 res_buf[3];
 	u64 args[2];
 	u32 xfer_count = 0;
 	int ret, wr_ret = 0, retry = 0;
 	size_t buf_size = (rbf_size > BITSTREAM_CHUNK_SIZE) ?
 				BITSTREAM_CHUNK_SIZE : rbf_size;

 	while (rbf_size || xfer_count) {
 		if (!wr_ret && rbf_size) {
 			args[0] = (u64)rbf_data;
 			args[1] = buf_size;
 			wr_ret = invoke_smc(INTEL_SIP_SMC_FPGA_CONFIG_WRITE,
 					    args, 2, NULL, 0);

 			debug("wr_ret = %d, rbf_data = %p, buf_size = %08lx\n",
 			      wr_ret, rbf_data, buf_size);

 			if (wr_ret)
 				continue;

 			rbf_size -= buf_size;
 			rbf_data += buf_size;

 			if (buf_size >= rbf_size)
 				buf_size = rbf_size;

 			xfer_count++;
 			puts(".");
 		} else {
 			ret = invoke_smc(
 				INTEL_SIP_SMC_FPGA_CONFIG_COMPLETED_WRITE,
 				NULL, 0, res_buf, ARRAY_SIZE(res_buf));
 			if (!ret) {
 				for (i = 0; i < ARRAY_SIZE(res_buf); i++) {
 					if (!res_buf[i])
 						break;
 					xfer_count--;
 					wr_ret = 0;
 					retry = 0;
 				}
 			} else if (ret !=
 				   INTEL_SIP_SMC_STATUS_BUSY)
 				return ret;
 			else if (!xfer_count)
 				return INTEL_SIP_SMC_STATUS_ERROR;

 			if (++retry >= RECONFIG_STATUS_POLL_RETRY_MAX)
 				return -ETIMEDOUT;

 			udelay(20000);
 		}
 		schedule();
 	}

 	return 0;
 }

 /*
  * This is the interface used by FPGA driver.
  * Return 0 for success, non-zero for error.
  */
 int intel_sdm_mb_load(Altera_desc *desc, const void *rbf_data, size_t rbf_size)
 {
 	int ret;
 	u64 arg = 1;

 	debug("Invoking FPGA_CONFIG_START...\n");

 	ret = invoke_smc(INTEL_SIP_SMC_FPGA_CONFIG_START, &arg, 1, NULL, 0);

 	if (ret) {
 		puts("Failure in RECONFIG mailbox command!\n");
 		return ret;
 	}

 	ret = send_bitstream(rbf_data, rbf_size);
 	if (ret) {
 		puts("Error sending bitstream!\n");
 		return ret;
 	}

 	/* Make sure we don't send MBOX_RECONFIG_STATUS too fast */
 	udelay(RECONFIG_STATUS_INTERVAL_DELAY_US);

 	debug("Polling with MBOX_RECONFIG_STATUS...\n");
 	ret = reconfig_status_polling_resp();
 	if (ret) {
 		puts("FPGA reconfiguration failed!");
 		return ret;
 	}

 	puts("FPGA reconfiguration OK!\n");

 	return ret;
 }

 #else

 static const struct mbox_cfgstat_state {
 	int			err_no;
 	const char		*error_name;
 } mbox_cfgstat_state[] = {
 	{MBOX_CFGSTAT_STATE_IDLE, "FPGA in idle mode."},
 	{MBOX_CFGSTAT_STATE_CONFIG, "FPGA in config mode."},
 	{MBOX_CFGSTAT_STATE_FAILACK, "Acknowledgment failed!"},
 	{MBOX_CFGSTAT_STATE_ERROR_INVALID, "Invalid bitstream!"},
 	{MBOX_CFGSTAT_STATE_ERROR_CORRUPT, "Corrupted bitstream!"},
 	{MBOX_CFGSTAT_STATE_ERROR_AUTH, "Authentication failed!"},
 	{MBOX_CFGSTAT_STATE_ERROR_CORE_IO, "I/O error!"},
 	{MBOX_CFGSTAT_STATE_ERROR_HARDWARE, "Hardware error!"},
 	{MBOX_CFGSTAT_STATE_ERROR_FAKE, "Fake error!"},
 	{MBOX_CFGSTAT_STATE_ERROR_BOOT_INFO, "Error in boot info!"},
 	{MBOX_CFGSTAT_STATE_ERROR_QSPI_ERROR, "Error in QSPI!"},
 	{MBOX_RESP_ERROR, "Mailbox general error!"},
 	{-ETIMEDOUT, "I/O timeout error"},
 	{-1, "Unknown error!"}
 };

 #define MBOX_CFGSTAT_MAX ARRAY_SIZE(mbox_cfgstat_state)

 static const char *mbox_cfgstat_to_str(int err)
 {
 	int i;

 	for (i = 0; i < MBOX_CFGSTAT_MAX - 1; i++) {
 		if (mbox_cfgstat_state[i].err_no == err)
 			return mbox_cfgstat_state[i].error_name;
 	}

 	return mbox_cfgstat_state[MBOX_CFGSTAT_MAX - 1].error_name;
 }

 /*
  * Add the ongoing transaction's command ID into pending list and return
  * the command ID for next transfer.
  */
 static u8 add_transfer(u32 *xfer_pending_list, size_t list_size, u8 id)
 {
 	int i;

 	for (i = 0; i < list_size; i++) {
 		if (xfer_pending_list[i])
 			continue;
 		xfer_pending_list[i] = id;
 		debug("ID(%d) added to transaction pending list\n", id);
 		/*
 		 * Increment command ID for next transaction.
 		 * Valid command ID (4 bits) is from 1 to 15.
 		 */
 		id = (id % 15) + 1;
 		break;
 	}

 	return id;
 }

 /*
  * Check whether response ID match the command ID in the transfer
  * pending list. If a match is found in the transfer pending list,
  * it clears the transfer pending list and return the matched
  * command ID.
  */
 static int get_and_clr_transfer(u32 *xfer_pending_list, size_t list_size,
 				u8 id)
 {
 	int i;

 	for (i = 0; i < list_size; i++) {
 		if (id != xfer_pending_list[i])
 			continue;
 		xfer_pending_list[i] = 0;
 		return id;
 	}

 	return 0;
 }

 /*
  * Polling the FPGA configuration status.
  * Return 0 for success, non-zero for error.
  */
 static int reconfig_status_polling_resp(void)
 {
 	int ret;
 	unsigned long start = get_timer(0);

 	while (1) {
 		ret = mbox_get_fpga_config_status(MBOX_RECONFIG_STATUS);
 		if (!ret)
 			return 0;	/* configuration success */

 		if (ret != MBOX_CFGSTAT_STATE_CONFIG)
 			return ret;

 		if (get_timer(start) > RECONFIG_STATUS_POLL_RESP_TIMEOUT_MS)
 			break;	/* time out */

 		puts(".");
 		udelay(RECONFIG_STATUS_INTERVAL_DELAY_US);
 		schedule();
 	}

 	return -ETIMEDOUT;
 }

 static u32 get_resp_hdr(u32 *r_index, u32 *w_index, u32 *resp_count,
 			u32 *resp_buf, u32 buf_size, u32 client_id)
 {
 	u32 buf[MBOX_RESP_BUFFER_SIZE];
 	u32 mbox_hdr;
 	u32 resp_len;
 	u32 hdr_len;
 	u32 i;

 	if (*resp_count < buf_size) {
 		u32 rcv_len_max = buf_size - *resp_count;

 		if (rcv_len_max > MBOX_RESP_BUFFER_SIZE)
 			rcv_len_max = MBOX_RESP_BUFFER_SIZE;
 		resp_len = mbox_rcv_resp(buf, rcv_len_max);

 		for (i = 0; i < resp_len; i++) {
 			resp_buf[(*w_index)++] = buf[i];
 			*w_index %= buf_size;
 			(*resp_count)++;
 		}
 	}

 	/* No response in buffer */
 	if (*resp_count == 0)
 		return 0;

 	mbox_hdr = resp_buf[*r_index];

 	hdr_len = MBOX_RESP_LEN_GET(mbox_hdr);

 	/* Insufficient header length to return a mailbox header */
 	if ((*resp_count - 1) < hdr_len)
 		return 0;

 	*r_index += (hdr_len + 1);
 	*r_index %= buf_size;
 	*resp_count -= (hdr_len + 1);

 	/* Make sure response belongs to us */
 	if (MBOX_RESP_CLIENT_GET(mbox_hdr) != client_id)
 		return 0;

 	return mbox_hdr;
 }

 /* Send bit stream data to SDM via RECONFIG_DATA mailbox command */
 static int send_reconfig_data(const void *rbf_data, size_t rbf_size,
 			      u32 xfer_max, u32 buf_size_max)
 {
 	u32 response_buffer[MBOX_RESP_BUFFER_SIZE];
 	u32 xfer_pending[MBOX_RESP_BUFFER_SIZE];
 	u32 resp_rindex = 0;
 	u32 resp_windex = 0;
 	u32 resp_count = 0;
 	u32 xfer_count = 0;
 	int resp_err = 0;
 	u8 cmd_id = 1;
 	u32 args[3];
 	int ret;

 	debug("SDM xfer_max = %d\n", xfer_max);
 	debug("SDM buf_size_max = %x\n\n", buf_size_max);

 	memset(xfer_pending, 0, sizeof(xfer_pending));

 	while (rbf_size || xfer_count) {
 		if (!resp_err && rbf_size && xfer_count < xfer_max) {
 			args[0] = MBOX_ARG_DESC_COUNT(1);
 			args[1] = (u64)rbf_data;
 			if (rbf_size >= buf_size_max) {
 				args[2] = buf_size_max;
 				rbf_size -= buf_size_max;
 				rbf_data += buf_size_max;
 			} else {
 				args[2] = (u64)rbf_size;
 				rbf_size = 0;
 			}

 			resp_err = mbox_send_cmd_only(cmd_id, MBOX_RECONFIG_DATA,
 						 MBOX_CMD_INDIRECT, 3, args);
 			if (!resp_err) {
 				xfer_count++;
 				cmd_id = add_transfer(xfer_pending,
 						      MBOX_RESP_BUFFER_SIZE,
 						      cmd_id);
 			}
 			puts(".");
 		} else {
 			u32 resp_hdr = get_resp_hdr(&resp_rindex, &resp_windex,
 						    &resp_count,
 						    response_buffer,
 						    MBOX_RESP_BUFFER_SIZE,
 						    MBOX_CLIENT_ID_UBOOT);

 			/*
 			 * If no valid response header found or
 			 * non-zero length from RECONFIG_DATA
 			 */
 			if (!resp_hdr || MBOX_RESP_LEN_GET(resp_hdr))
 				continue;

 			/* Check for response's status */
 			if (!resp_err) {
 				resp_err = MBOX_RESP_ERR_GET(resp_hdr);
 				debug("Response error code: %08x\n", resp_err);
 			}

 			ret = get_and_clr_transfer(xfer_pending,
 						   MBOX_RESP_BUFFER_SIZE,
 						   MBOX_RESP_ID_GET(resp_hdr));
 			if (ret) {
 				/* Claim and reuse the ID */
 				cmd_id = (u8)ret;
 				xfer_count--;
 			}

 			if (resp_err && !xfer_count)
 				return resp_err;
 		}
 		schedule();
 	}

 	return 0;
 }

 /*
  * This is the interface used by FPGA driver.
  * Return 0 for success, non-zero for error.
  */
 int intel_sdm_mb_load(Altera_desc *desc, const void *rbf_data, size_t rbf_size)
 {
 	int ret;
 	u32 resp_len = 2;
 	u32 resp_buf[2];

 	debug("Sending MBOX_RECONFIG...\n");
 	ret = mbox_send_cmd(MBOX_ID_UBOOT, MBOX_RECONFIG, MBOX_CMD_DIRECT, 0,
 			    NULL, 0, &resp_len, resp_buf);
 	if (ret) {
 		puts("Failure in RECONFIG mailbox command!\n");
 		return ret;
 	}

 	ret = send_reconfig_data(rbf_data, rbf_size, resp_buf[0], resp_buf[1]);
 	if (ret) {
 		printf("RECONFIG_DATA error: %08x, %s\n", ret,
 		       mbox_cfgstat_to_str(ret));
 		return ret;
 	}

 	/* Make sure we don't send MBOX_RECONFIG_STATUS too fast */
 	udelay(RECONFIG_STATUS_INTERVAL_DELAY_US);

 	debug("Polling with MBOX_RECONFIG_STATUS...\n");
 	ret = reconfig_status_polling_resp();
 	if (ret) {
 		printf("RECONFIG_STATUS Error: %08x, %s\n", ret,
 		       mbox_cfgstat_to_str(ret));
 		return ret;
 	}

 	puts("FPGA reconfiguration OK!\n");

 	return ret;
 }
 #endif
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2018 Intel Corporation <www.intel.com>
	*/

	#include <altera.h>
	#include <log.h>
	#include <time.h>
	#include <watchdog.h>
	#include <asm/arch/mailbox_s10.h>
	#include <asm/arch/smc_api.h>
	#include <linux/delay.h>
	#include <linux/errno.h>
	#include <linux/intel-smc.h>
	#include <linux/string.h>

	#define RECONFIG_STATUS_POLL_RESP_TIMEOUT_MS 60000
	#define RECONFIG_STATUS_INTERVAL_DELAY_US 1000000

	#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_ATF)

	#define BITSTREAM_CHUNK_SIZE 0xFFFF0
	#define RECONFIG_STATUS_POLL_RETRY_MAX 100

	/*
	* Polling the FPGA configuration status.
	* Return 0 for success, non-zero for error.
	*/
	static int reconfig_status_polling_resp(void)
	{
	int ret;
	unsigned long start = get_timer(0);

	while (1) {
	ret = invoke_smc(INTEL_SIP_SMC_FPGA_CONFIG_ISDONE, NULL, 0,
	NULL, 0);

	if (!ret)
	return 0; /* configuration success */

	if (ret != INTEL_SIP_SMC_STATUS_BUSY)
	return ret;

	if (get_timer(start) > RECONFIG_STATUS_POLL_RESP_TIMEOUT_MS)
	return -ETIMEDOUT; /* time out */

	puts(".");
	udelay(RECONFIG_STATUS_INTERVAL_DELAY_US);
	schedule();
	}

	return -ETIMEDOUT;
	}

	static int send_bitstream(const void *rbf_data, size_t rbf_size)
	{
	int i;
	u64 res_buf[3];
	u64 args[2];
	u32 xfer_count = 0;
	int ret, wr_ret = 0, retry = 0;
	size_t buf_size = (rbf_size > BITSTREAM_CHUNK_SIZE) ?
	BITSTREAM_CHUNK_SIZE : rbf_size;

	while (rbf_size \|\| xfer_count) {
	if (!wr_ret && rbf_size) {
	args[0] = (u64)rbf_data;
	args[1] = buf_size;
	wr_ret = invoke_smc(INTEL_SIP_SMC_FPGA_CONFIG_WRITE,
	args, 2, NULL, 0);

	debug("wr_ret = %d, rbf_data = %p, buf_size = %08lx\n",
	wr_ret, rbf_data, buf_size);

	if (wr_ret)
	continue;

	rbf_size -= buf_size;
	rbf_data += buf_size;

	if (buf_size >= rbf_size)
	buf_size = rbf_size;

	xfer_count++;
	puts(".");
	} else {
	ret = invoke_smc(
	INTEL_SIP_SMC_FPGA_CONFIG_COMPLETED_WRITE,
	NULL, 0, res_buf, ARRAY_SIZE(res_buf));
	if (!ret) {
	for (i = 0; i < ARRAY_SIZE(res_buf); i++) {
	if (!res_buf[i])
	break;
	xfer_count--;
	wr_ret = 0;
	retry = 0;
	}
	} else if (ret !=
	INTEL_SIP_SMC_STATUS_BUSY)
	return ret;
	else if (!xfer_count)
	return INTEL_SIP_SMC_STATUS_ERROR;

	if (++retry >= RECONFIG_STATUS_POLL_RETRY_MAX)
	return -ETIMEDOUT;

	udelay(20000);
	}
	schedule();
	}

	return 0;
	}

	/*
	* This is the interface used by FPGA driver.
	* Return 0 for success, non-zero for error.
	*/
	int intel_sdm_mb_load(Altera_desc desc, const void rbf_data, size_t rbf_size)
	{
	int ret;
	u64 arg = 1;

	debug("Invoking FPGA_CONFIG_START...\n");

	ret = invoke_smc(INTEL_SIP_SMC_FPGA_CONFIG_START, &arg, 1, NULL, 0);

	if (ret) {
	puts("Failure in RECONFIG mailbox command!\n");
	return ret;
	}

	ret = send_bitstream(rbf_data, rbf_size);
	if (ret) {
	puts("Error sending bitstream!\n");
	return ret;
	}

	/* Make sure we don't send MBOX_RECONFIG_STATUS too fast */
	udelay(RECONFIG_STATUS_INTERVAL_DELAY_US);

	debug("Polling with MBOX_RECONFIG_STATUS...\n");
	ret = reconfig_status_polling_resp();
	if (ret) {
	puts("FPGA reconfiguration failed!");
	return ret;
	}

	puts("FPGA reconfiguration OK!\n");

	return ret;
	}

	#else

	static const struct mbox_cfgstat_state {
	int err_no;
	const char *error_name;
	} mbox_cfgstat_state[] = {
	{MBOX_CFGSTAT_STATE_IDLE, "FPGA in idle mode."},
	{MBOX_CFGSTAT_STATE_CONFIG, "FPGA in config mode."},
	{MBOX_CFGSTAT_STATE_FAILACK, "Acknowledgment failed!"},
	{MBOX_CFGSTAT_STATE_ERROR_INVALID, "Invalid bitstream!"},
	{MBOX_CFGSTAT_STATE_ERROR_CORRUPT, "Corrupted bitstream!"},
	{MBOX_CFGSTAT_STATE_ERROR_AUTH, "Authentication failed!"},
	{MBOX_CFGSTAT_STATE_ERROR_CORE_IO, "I/O error!"},
	{MBOX_CFGSTAT_STATE_ERROR_HARDWARE, "Hardware error!"},
	{MBOX_CFGSTAT_STATE_ERROR_FAKE, "Fake error!"},
	{MBOX_CFGSTAT_STATE_ERROR_BOOT_INFO, "Error in boot info!"},
	{MBOX_CFGSTAT_STATE_ERROR_QSPI_ERROR, "Error in QSPI!"},
	{MBOX_RESP_ERROR, "Mailbox general error!"},
	{-ETIMEDOUT, "I/O timeout error"},
	{-1, "Unknown error!"}
	};

	#define MBOX_CFGSTAT_MAX ARRAY_SIZE(mbox_cfgstat_state)

	static const char *mbox_cfgstat_to_str(int err)
	{
	int i;

	for (i = 0; i < MBOX_CFGSTAT_MAX - 1; i++) {
	if (mbox_cfgstat_state[i].err_no == err)
	return mbox_cfgstat_state[i].error_name;
	}

	return mbox_cfgstat_state[MBOX_CFGSTAT_MAX - 1].error_name;
	}

	/*
	* Add the ongoing transaction's command ID into pending list and return
	* the command ID for next transfer.
	*/
	static u8 add_transfer(u32 *xfer_pending_list, size_t list_size, u8 id)
	{
	int i;

	for (i = 0; i < list_size; i++) {
	if (xfer_pending_list[i])
	continue;
	xfer_pending_list[i] = id;
	debug("ID(%d) added to transaction pending list\n", id);
	/*
	* Increment command ID for next transaction.
	* Valid command ID (4 bits) is from 1 to 15.
	*/
	id = (id % 15) + 1;
	break;
	}

	return id;
	}

	/*
	* Check whether response ID match the command ID in the transfer
	* pending list. If a match is found in the transfer pending list,
	* it clears the transfer pending list and return the matched
	* command ID.
	*/
	static int get_and_clr_transfer(u32 *xfer_pending_list, size_t list_size,
	u8 id)
	{
	int i;

	for (i = 0; i < list_size; i++) {
	if (id != xfer_pending_list[i])
	continue;
	xfer_pending_list[i] = 0;
	return id;
	}

	return 0;
	}

	/*
	* Polling the FPGA configuration status.
	* Return 0 for success, non-zero for error.
	*/
	static int reconfig_status_polling_resp(void)
	{
	int ret;
	unsigned long start = get_timer(0);

	while (1) {
	ret = mbox_get_fpga_config_status(MBOX_RECONFIG_STATUS);
	if (!ret)
	return 0; /* configuration success */

	if (ret != MBOX_CFGSTAT_STATE_CONFIG)
	return ret;

	if (get_timer(start) > RECONFIG_STATUS_POLL_RESP_TIMEOUT_MS)
	break; /* time out */

	puts(".");
	udelay(RECONFIG_STATUS_INTERVAL_DELAY_US);
	schedule();
	}

	return -ETIMEDOUT;
	}

	static u32 get_resp_hdr(u32 r_index, u32 w_index, u32 *resp_count,
	u32 *resp_buf, u32 buf_size, u32 client_id)
	{
	u32 buf[MBOX_RESP_BUFFER_SIZE];
	u32 mbox_hdr;
	u32 resp_len;
	u32 hdr_len;
	u32 i;

	if (*resp_count < buf_size) {
	u32 rcv_len_max = buf_size - *resp_count;

	if (rcv_len_max > MBOX_RESP_BUFFER_SIZE)
	rcv_len_max = MBOX_RESP_BUFFER_SIZE;
	resp_len = mbox_rcv_resp(buf, rcv_len_max);

	for (i = 0; i < resp_len; i++) {
	resp_buf[(*w_index)++] = buf[i];
	*w_index %= buf_size;
	(*resp_count)++;
	}
	}

	/* No response in buffer */
	if (*resp_count == 0)
	return 0;

	mbox_hdr = resp_buf[*r_index];

	hdr_len = MBOX_RESP_LEN_GET(mbox_hdr);

	/* Insufficient header length to return a mailbox header */
	if ((*resp_count - 1) < hdr_len)
	return 0;

	*r_index += (hdr_len + 1);
	*r_index %= buf_size;
	*resp_count -= (hdr_len + 1);

	/* Make sure response belongs to us */
	if (MBOX_RESP_CLIENT_GET(mbox_hdr) != client_id)
	return 0;

	return mbox_hdr;
	}

	/* Send bit stream data to SDM via RECONFIG_DATA mailbox command */
	static int send_reconfig_data(const void *rbf_data, size_t rbf_size,
	u32 xfer_max, u32 buf_size_max)
	{
	u32 response_buffer[MBOX_RESP_BUFFER_SIZE];
	u32 xfer_pending[MBOX_RESP_BUFFER_SIZE];
	u32 resp_rindex = 0;
	u32 resp_windex = 0;
	u32 resp_count = 0;
	u32 xfer_count = 0;
	int resp_err = 0;
	u8 cmd_id = 1;
	u32 args[3];
	int ret;

	debug("SDM xfer_max = %d\n", xfer_max);
	debug("SDM buf_size_max = %x\n\n", buf_size_max);

	memset(xfer_pending, 0, sizeof(xfer_pending));

	while (rbf_size \|\| xfer_count) {
	if (!resp_err && rbf_size && xfer_count < xfer_max) {
	args[0] = MBOX_ARG_DESC_COUNT(1);
	args[1] = (u64)rbf_data;
	if (rbf_size >= buf_size_max) {
	args[2] = buf_size_max;
	rbf_size -= buf_size_max;
	rbf_data += buf_size_max;
	} else {
	args[2] = (u64)rbf_size;
	rbf_size = 0;
	}

	resp_err = mbox_send_cmd_only(cmd_id, MBOX_RECONFIG_DATA,
	MBOX_CMD_INDIRECT, 3, args);
	if (!resp_err) {
	xfer_count++;
	cmd_id = add_transfer(xfer_pending,
	MBOX_RESP_BUFFER_SIZE,
	cmd_id);
	}
	puts(".");
	} else {
	u32 resp_hdr = get_resp_hdr(&resp_rindex, &resp_windex,
	&resp_count,
	response_buffer,
	MBOX_RESP_BUFFER_SIZE,
	MBOX_CLIENT_ID_UBOOT);

	/*
	* If no valid response header found or
	* non-zero length from RECONFIG_DATA
	*/
	if (!resp_hdr \|\| MBOX_RESP_LEN_GET(resp_hdr))
	continue;

	/* Check for response's status */
	if (!resp_err) {
	resp_err = MBOX_RESP_ERR_GET(resp_hdr);
	debug("Response error code: %08x\n", resp_err);
	}

	ret = get_and_clr_transfer(xfer_pending,
	MBOX_RESP_BUFFER_SIZE,
	MBOX_RESP_ID_GET(resp_hdr));
	if (ret) {
	/* Claim and reuse the ID */
	cmd_id = (u8)ret;
	xfer_count--;
	}

	if (resp_err && !xfer_count)
	return resp_err;
	}
	schedule();
	}

	return 0;
	}

	/*
	* This is the interface used by FPGA driver.
	* Return 0 for success, non-zero for error.
	*/
	int intel_sdm_mb_load(Altera_desc desc, const void rbf_data, size_t rbf_size)
	{
	int ret;
	u32 resp_len = 2;
	u32 resp_buf[2];

	debug("Sending MBOX_RECONFIG...\n");
	ret = mbox_send_cmd(MBOX_ID_UBOOT, MBOX_RECONFIG, MBOX_CMD_DIRECT, 0,
	NULL, 0, &resp_len, resp_buf);
	if (ret) {
	puts("Failure in RECONFIG mailbox command!\n");
	return ret;
	}

	ret = send_reconfig_data(rbf_data, rbf_size, resp_buf[0], resp_buf[1]);
	if (ret) {
	printf("RECONFIG_DATA error: %08x, %s\n", ret,
	mbox_cfgstat_to_str(ret));
	return ret;
	}

	/* Make sure we don't send MBOX_RECONFIG_STATUS too fast */
	udelay(RECONFIG_STATUS_INTERVAL_DELAY_US);

	debug("Polling with MBOX_RECONFIG_STATUS...\n");
	ret = reconfig_status_polling_resp();
	if (ret) {
	printf("RECONFIG_STATUS Error: %08x, %s\n", ret,
	mbox_cfgstat_to_str(ret));
	return ret;
	}

	puts("FPGA reconfiguration OK!\n");

	return ret;
	}
	#endif