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// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel Wireless UWB Link 1480
* PHY parameters upload
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* Code for uploading the PHY parameters to the PHY through the UWB
* Radio Control interface.
*
* We just send the data through the MPI interface using HWA-like
* commands and then reset the PHY to make sure it is ok.
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/usb/wusb.h>
#include "i1480-dfu.h"
/**
* Write a value array to an address of the MPI interface
*
* @i1480: Device descriptor
* @data: Data array to write
* @size: Size of the data array
* @returns: 0 if ok, < 0 errno code on error.
*
* The data array is organized into pairs:
*
* ADDRESS VALUE
*
* ADDRESS is BE 16 bit unsigned, VALUE 8 bit unsigned. Size thus has
* to be a multiple of three.
*/
static
int i1480_mpi_write(struct i1480 *i1480, const void *data, size_t size)
{
int result;
struct i1480_cmd_mpi_write *cmd = i1480->cmd_buf;
struct i1480_evt_confirm *reply = i1480->evt_buf;
BUG_ON(size > 480);
result = -ENOMEM;
cmd->rccb.bCommandType = i1480_CET_VS1;
cmd->rccb.wCommand = cpu_to_le16(i1480_CMD_MPI_WRITE);
cmd->size = cpu_to_le16(size);
memcpy(cmd->data, data, size);
reply->rceb.bEventType = i1480_CET_VS1;
reply->rceb.wEvent = i1480_CMD_MPI_WRITE;
result = i1480_cmd(i1480, "MPI-WRITE", sizeof(*cmd) + size, sizeof(*reply));
if (result < 0)
goto out;
if (reply->bResultCode != UWB_RC_RES_SUCCESS) {
dev_err(i1480->dev, "MPI-WRITE: command execution failed: %d\n",
reply->bResultCode);
result = -EIO;
}
out:
return result;
}
/**
* Read a value array to from an address of the MPI interface
*
* @i1480: Device descriptor
* @data: where to place the read array
* @srcaddr: Where to read from
* @size: Size of the data read array
* @returns: 0 if ok, < 0 errno code on error.
*
* The command data array is organized into pairs ADDR0 ADDR1..., and
* the returned data in ADDR0 VALUE0 ADDR1 VALUE1...
*
* We generate the command array to be a sequential read and then
* rearrange the result.
*
* We use the i1480->cmd_buf for the command, i1480->evt_buf for the reply.
*
* As the reply has to fit in 512 bytes (i1480->evt_buffer), the max amount
* of values we can read is (512 - sizeof(*reply)) / 3
*/
static
int i1480_mpi_read(struct i1480 *i1480, u8 *data, u16 srcaddr, size_t size)
{
int result;
struct i1480_cmd_mpi_read *cmd = i1480->cmd_buf;
struct i1480_evt_mpi_read *reply = i1480->evt_buf;
unsigned cnt;
memset(i1480->cmd_buf, 0x69, 512);
memset(i1480->evt_buf, 0x69, 512);
BUG_ON(size > (i1480->buf_size - sizeof(*reply)) / 3);
result = -ENOMEM;
cmd->rccb.bCommandType = i1480_CET_VS1;
cmd->rccb.wCommand = cpu_to_le16(i1480_CMD_MPI_READ);
cmd->size = cpu_to_le16(3*size);
for (cnt = 0; cnt < size; cnt++) {
cmd->data[cnt].page = (srcaddr + cnt) >> 8;
cmd->data[cnt].offset = (srcaddr + cnt) & 0xff;
}
reply->rceb.bEventType = i1480_CET_VS1;
reply->rceb.wEvent = i1480_CMD_MPI_READ;
result = i1480_cmd(i1480, "MPI-READ", sizeof(*cmd) + 2*size,
sizeof(*reply) + 3*size);
if (result < 0)
goto out;
if (reply->bResultCode != UWB_RC_RES_SUCCESS) {
dev_err(i1480->dev, "MPI-READ: command execution failed: %d\n",
reply->bResultCode);
result = -EIO;
goto out;
}
for (cnt = 0; cnt < size; cnt++) {
if (reply->data[cnt].page != (srcaddr + cnt) >> 8)
dev_err(i1480->dev, "MPI-READ: page inconsistency at "
"index %u: expected 0x%02x, got 0x%02x\n", cnt,
(srcaddr + cnt) >> 8, reply->data[cnt].page);
if (reply->data[cnt].offset != ((srcaddr + cnt) & 0x00ff))
dev_err(i1480->dev, "MPI-READ: offset inconsistency at "
"index %u: expected 0x%02x, got 0x%02x\n", cnt,
(srcaddr + cnt) & 0x00ff,
reply->data[cnt].offset);
data[cnt] = reply->data[cnt].value;
}
result = 0;
out:
return result;
}
/**
* Upload a PHY firmware, wait for it to start
*
* @i1480: Device instance
* @fw_name: Name of the file that contains the firmware
*
* We assume the MAC fw is up and running. This means we can use the
* MPI interface to write the PHY firmware. Once done, we issue an
* MBOA Reset, which will force the MAC to reset and reinitialize the
* PHY. If that works, we are ready to go.
*
* Max packet size for the MPI write is 512, so the max buffer is 480
* (which gives us 160 byte triads of MSB, LSB and VAL for the data).
*/
int i1480_phy_fw_upload(struct i1480 *i1480)
{
int result;
const struct firmware *fw;
const char *data_itr, *data_top;
const size_t MAX_BLK_SIZE = 480; /* 160 triads */
size_t data_size;
u8 phy_stat;
result = request_firmware(&fw, i1480->phy_fw_name, i1480->dev);
if (result < 0)
goto out;
/* Loop writing data in chunks as big as possible until done. */
for (data_itr = fw->data, data_top = data_itr + fw->size;
data_itr < data_top; data_itr += MAX_BLK_SIZE) {
data_size = min(MAX_BLK_SIZE, (size_t) (data_top - data_itr));
result = i1480_mpi_write(i1480, data_itr, data_size);
if (result < 0)
goto error_mpi_write;
}
/* Read MPI page 0, offset 6; if 0, PHY was initialized correctly. */
result = i1480_mpi_read(i1480, &phy_stat, 0x0006, 1);
if (result < 0) {
dev_err(i1480->dev, "PHY: can't get status: %d\n", result);
goto error_mpi_status;
}
if (phy_stat != 0) {
result = -ENODEV;
dev_info(i1480->dev, "error, PHY not ready: %u\n", phy_stat);
goto error_phy_status;
}
dev_info(i1480->dev, "PHY fw '%s': uploaded\n", i1480->phy_fw_name);
error_phy_status:
error_mpi_status:
error_mpi_write:
release_firmware(fw);
if (result < 0)
dev_err(i1480->dev, "PHY fw '%s': failed to upload (%d), "
"power cycle device\n", i1480->phy_fw_name, result);
out:
return result;
}
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