drivers/uwb/i1480/dfu/phy.c

   1 /*
   2  * Intel Wireless UWB Link 1480
   3  * PHY parameters upload
   4  *
   5  * Copyright (C) 2005-2006 Intel Corporation
   6  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version
  10  * 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  *
  22  *
  23  * Code for uploading the PHY parameters to the PHY through the UWB
  24  * Radio Control interface.
  25  *
  26  * We just send the data through the MPI interface using HWA-like
  27  * commands and then reset the PHY to make sure it is ok.
  28  */
  29 #include <linux/delay.h>
  30 #include <linux/device.h>
  31 #include <linux/firmware.h>
  32 #include <linux/usb/wusb.h>
  33 #include "i1480-dfu.h"
  34
  35
  36 /**
  37  * Write a value array to an address of the MPI interface
  38  *
  39  * @i1480:      Device descriptor
  40  * @data:       Data array to write
  41  * @size:       Size of the data array
  42  * @returns:    0 if ok, < 0 errno code on error.
  43  *
  44  * The data array is organized into pairs:
  45  *
  46  * ADDRESS VALUE
  47  *
  48  * ADDRESS is BE 16 bit unsigned, VALUE 8 bit unsigned. Size thus has
  49  * to be a multiple of three.
  50  */
  51 static
  52 int i1480_mpi_write(struct i1480 *i1480, const void *data, size_t size)
  53 {
  54         int result;
  55         struct i1480_cmd_mpi_write *cmd = i1480->cmd_buf;
  56         struct i1480_evt_confirm *reply = i1480->evt_buf;
  57
  58         BUG_ON(size > 480);
  59         result = -ENOMEM;
  60         cmd->rccb.bCommandType = i1480_CET_VS1;
  61         cmd->rccb.wCommand = cpu_to_le16(i1480_CMD_MPI_WRITE);
  62         cmd->size = cpu_to_le16(size);
  63         memcpy(cmd->data, data, size);
  64         reply->rceb.bEventType = i1480_CET_VS1;
  65         reply->rceb.wEvent = i1480_CMD_MPI_WRITE;
  66         result = i1480_cmd(i1480, "MPI-WRITE", sizeof(*cmd) + size, sizeof(*reply));
  67         if (result < 0)
  68                 goto out;
  69         if (reply->bResultCode != UWB_RC_RES_SUCCESS) {
  70                 dev_err(i1480->dev, "MPI-WRITE: command execution failed: %d\n",
  71                         reply->bResultCode);
  72                 result = -EIO;
  73         }
  74 out:
  75         return result;
  76 }
  77
  78
  79 /**
  80  * Read a value array to from an address of the MPI interface
  81  *
  82  * @i1480:      Device descriptor
  83  * @data:       where to place the read array
  84  * @srcaddr:    Where to read from
  85  * @size:       Size of the data read array
  86  * @returns:    0 if ok, < 0 errno code on error.
  87  *
  88  * The command data array is organized into pairs ADDR0 ADDR1..., and
  89  * the returned data in ADDR0 VALUE0 ADDR1 VALUE1...
  90  *
  91  * We generate the command array to be a sequential read and then
  92  * rearrange the result.
  93  *
  94  * We use the i1480->cmd_buf for the command, i1480->evt_buf for the reply.
  95  *
  96  * As the reply has to fit in 512 bytes (i1480->evt_buffer), the max amount
  97  * of values we can read is (512 - sizeof(*reply)) / 3
  98  */
  99 static
 100 int i1480_mpi_read(struct i1480 *i1480, u8 *data, u16 srcaddr, size_t size)
 101 {
 102         int result;
 103         struct i1480_cmd_mpi_read *cmd = i1480->cmd_buf;
 104         struct i1480_evt_mpi_read *reply = i1480->evt_buf;
 105         unsigned cnt;
 106
 107         memset(i1480->cmd_buf, 0x69, 512);
 108         memset(i1480->evt_buf, 0x69, 512);
 109
 110         BUG_ON(size > (i1480->buf_size - sizeof(*reply)) / 3);
 111         result = -ENOMEM;
 112         cmd->rccb.bCommandType = i1480_CET_VS1;
 113         cmd->rccb.wCommand = cpu_to_le16(i1480_CMD_MPI_READ);
 114         cmd->size = cpu_to_le16(3*size);
 115         for (cnt = 0; cnt < size; cnt++) {
 116                 cmd->data[cnt].page = (srcaddr + cnt) >> 8;
 117                 cmd->data[cnt].offset = (srcaddr + cnt) & 0xff;
 118         }
 119         reply->rceb.bEventType = i1480_CET_VS1;
 120         reply->rceb.wEvent = i1480_CMD_MPI_READ;
 121         result = i1480_cmd(i1480, "MPI-READ", sizeof(*cmd) + 2*size,
 122                         sizeof(*reply) + 3*size);
 123         if (result < 0)
 124                 goto out;
 125         if (reply->bResultCode != UWB_RC_RES_SUCCESS) {
 126                 dev_err(i1480->dev, "MPI-READ: command execution failed: %d\n",
 127                         reply->bResultCode);
 128                 result = -EIO;
 129                 goto out;
 130         }
 131         for (cnt = 0; cnt < size; cnt++) {
 132                 if (reply->data[cnt].page != (srcaddr + cnt) >> 8)
 133                         dev_err(i1480->dev, "MPI-READ: page inconsistency at "
 134                                 "index %u: expected 0x%02x, got 0x%02x\n", cnt,
 135                                 (srcaddr + cnt) >> 8, reply->data[cnt].page);
 136                 if (reply->data[cnt].offset != ((srcaddr + cnt) & 0x00ff))
 137                         dev_err(i1480->dev, "MPI-READ: offset inconsistency at "
 138                                 "index %u: expected 0x%02x, got 0x%02x\n", cnt,
 139                                 (srcaddr + cnt) & 0x00ff,
 140                                 reply->data[cnt].offset);
 141                 data[cnt] = reply->data[cnt].value;
 142         }
 143         result = 0;
 144 out:
 145         return result;
 146 }
 147
 148
 149 /**
 150  * Upload a PHY firmware, wait for it to start
 151  *
 152  * @i1480:     Device instance
 153  * @fw_name: Name of the file that contains the firmware
 154  *
 155  * We assume the MAC fw is up and running. This means we can use the
 156  * MPI interface to write the PHY firmware. Once done, we issue an
 157  * MBOA Reset, which will force the MAC to reset and reinitialize the
 158  * PHY. If that works, we are ready to go.
 159  *
 160  * Max packet size for the MPI write is 512, so the max buffer is 480
 161  * (which gives us 160 byte triads of MSB, LSB and VAL for the data).
 162  */
 163 int i1480_phy_fw_upload(struct i1480 *i1480)
 164 {
 165         int result;
 166         const struct firmware *fw;
 167         const char *data_itr, *data_top;
 168         const size_t MAX_BLK_SIZE = 480;        /* 160 triads */
 169         size_t data_size;
 170         u8 phy_stat;
 171
 172         result = request_firmware(&fw, i1480->phy_fw_name, i1480->dev);
 173         if (result < 0)
 174                 goto out;
 175         /* Loop writing data in chunks as big as possible until done. */
 176         for (data_itr = fw->data, data_top = data_itr + fw->size;
 177              data_itr < data_top; data_itr += MAX_BLK_SIZE) {
 178                 data_size = min(MAX_BLK_SIZE, (size_t) (data_top - data_itr));
 179                 result = i1480_mpi_write(i1480, data_itr, data_size);
 180                 if (result < 0)
 181                         goto error_mpi_write;
 182         }
 183         /* Read MPI page 0, offset 6; if 0, PHY was initialized correctly. */
 184         result = i1480_mpi_read(i1480, &phy_stat, 0x0006, 1);
 185         if (result < 0) {
 186                 dev_err(i1480->dev, "PHY: can't get status: %d\n", result);
 187                 goto error_mpi_status;
 188         }
 189         if (phy_stat != 0) {
 190                 result = -ENODEV;
 191                 dev_info(i1480->dev, "error, PHY not ready: %u\n", phy_stat);
 192                 goto error_phy_status;
 193         }
 194         dev_info(i1480->dev, "PHY fw '%s': uploaded\n", i1480->phy_fw_name);
 195 error_phy_status:
 196 error_mpi_status:
 197 error_mpi_write:
 198         release_firmware(fw);
 199         if (result < 0)
 200                 dev_err(i1480->dev, "PHY fw '%s': failed to upload (%d), "
 201                         "power cycle device\n", i1480->phy_fw_name, result);
 202 out:
 203         return result;
 204 }