drivers/net/wireless/wl12xx/wl1251_io.c

   1 /*
   2  * This file is part of wl12xx
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  *
   6  * Contact: Kalle Valo <kalle.valo@nokia.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
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * 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 St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include "wl1251.h"
  25 #include "reg.h"
  26 #include "wl1251_io.h"
  27
  28 /* FIXME: this is static data nowadays and the table can be removed */
  29 static enum wl12xx_acx_int_reg wl1251_io_reg_table[ACX_REG_TABLE_LEN] = {
  30         [ACX_REG_INTERRUPT_TRIG]     = (REGISTERS_BASE + 0x0474),
  31         [ACX_REG_INTERRUPT_TRIG_H]   = (REGISTERS_BASE + 0x0478),
  32         [ACX_REG_INTERRUPT_MASK]     = (REGISTERS_BASE + 0x0494),
  33         [ACX_REG_HINT_MASK_SET]      = (REGISTERS_BASE + 0x0498),
  34         [ACX_REG_HINT_MASK_CLR]      = (REGISTERS_BASE + 0x049C),
  35         [ACX_REG_INTERRUPT_NO_CLEAR] = (REGISTERS_BASE + 0x04B0),
  36         [ACX_REG_INTERRUPT_CLEAR]    = (REGISTERS_BASE + 0x04A4),
  37         [ACX_REG_INTERRUPT_ACK]      = (REGISTERS_BASE + 0x04A8),
  38         [ACX_REG_SLV_SOFT_RESET]     = (REGISTERS_BASE + 0x0000),
  39         [ACX_REG_EE_START]           = (REGISTERS_BASE + 0x080C),
  40         [ACX_REG_ECPU_CONTROL]       = (REGISTERS_BASE + 0x0804)
  41 };
  42
  43 static int wl1251_translate_reg_addr(struct wl1251 *wl, int addr)
  44 {
  45         /* If the address is lower than REGISTERS_BASE, it means that this is
  46          * a chip-specific register address, so look it up in the registers
  47          * table */
  48         if (addr < REGISTERS_BASE) {
  49                 /* Make sure we don't go over the table */
  50                 if (addr >= ACX_REG_TABLE_LEN) {
  51                         wl1251_error("address out of range (%d)", addr);
  52                         return -EINVAL;
  53                 }
  54                 addr = wl1251_io_reg_table[addr];
  55         }
  56
  57         return addr - wl->physical_reg_addr + wl->virtual_reg_addr;
  58 }
  59
  60 static int wl1251_translate_mem_addr(struct wl1251 *wl, int addr)
  61 {
  62         return addr - wl->physical_mem_addr + wl->virtual_mem_addr;
  63 }
  64
  65 void wl1251_mem_read(struct wl1251 *wl, int addr, void *buf, size_t len)
  66 {
  67         int physical;
  68
  69         physical = wl1251_translate_mem_addr(wl, addr);
  70
  71         wl->if_ops->read(wl, physical, buf, len);
  72 }
  73
  74 void wl1251_mem_write(struct wl1251 *wl, int addr, void *buf, size_t len)
  75 {
  76         int physical;
  77
  78         physical = wl1251_translate_mem_addr(wl, addr);
  79
  80         wl->if_ops->write(wl, physical, buf, len);
  81 }
  82
  83 u32 wl1251_mem_read32(struct wl1251 *wl, int addr)
  84 {
  85         return wl1251_read32(wl, wl1251_translate_mem_addr(wl, addr));
  86 }
  87
  88 void wl1251_mem_write32(struct wl1251 *wl, int addr, u32 val)
  89 {
  90         wl1251_write32(wl, wl1251_translate_mem_addr(wl, addr), val);
  91 }
  92
  93 u32 wl1251_reg_read32(struct wl1251 *wl, int addr)
  94 {
  95         return wl1251_read32(wl, wl1251_translate_reg_addr(wl, addr));
  96 }
  97
  98 void wl1251_reg_write32(struct wl1251 *wl, int addr, u32 val)
  99 {
 100         wl1251_write32(wl, wl1251_translate_reg_addr(wl, addr), val);
 101 }
 102
 103 /* Set the partitions to access the chip addresses.
 104  *
 105  * There are two VIRTUAL partitions (the memory partition and the
 106  * registers partition), which are mapped to two different areas of the
 107  * PHYSICAL (hardware) memory.  This function also makes other checks to
 108  * ensure that the partitions are not overlapping.  In the diagram below, the
 109  * memory partition comes before the register partition, but the opposite is
 110  * also supported.
 111  *
 112  *                               PHYSICAL address
 113  *                                     space
 114  *
 115  *                                    |    |
 116  *                                 ...+----+--> mem_start
 117  *          VIRTUAL address     ...   |    |
 118  *               space       ...      |    | [PART_0]
 119  *                        ...         |    |
 120  * 0x00000000 <--+----+...         ...+----+--> mem_start + mem_size
 121  *               |    |         ...   |    |
 122  *               |MEM |      ...      |    |
 123  *               |    |   ...         |    |
 124  *  part_size <--+----+...            |    | {unused area)
 125  *               |    |   ...         |    |
 126  *               |REG |      ...      |    |
 127  *  part_size    |    |         ...   |    |
 128  *      +     <--+----+...         ...+----+--> reg_start
 129  *  reg_size              ...         |    |
 130  *                           ...      |    | [PART_1]
 131  *                              ...   |    |
 132  *                                 ...+----+--> reg_start + reg_size
 133  *                                    |    |
 134  *
 135  */
 136 void wl1251_set_partition(struct wl1251 *wl,
 137                           u32 mem_start, u32 mem_size,
 138                           u32 reg_start, u32 reg_size)
 139 {
 140         struct wl1251_partition partition[2];
 141
 142         wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 143                      mem_start, mem_size);
 144         wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 145                      reg_start, reg_size);
 146
 147         /* Make sure that the two partitions together don't exceed the
 148          * address range */
 149         if ((mem_size + reg_size) > HW_ACCESS_MEMORY_MAX_RANGE) {
 150                 wl1251_debug(DEBUG_SPI, "Total size exceeds maximum virtual"
 151                              " address range.  Truncating partition[0].");
 152                 mem_size = HW_ACCESS_MEMORY_MAX_RANGE - reg_size;
 153                 wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 154                              mem_start, mem_size);
 155                 wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 156                              reg_start, reg_size);
 157         }
 158
 159         if ((mem_start < reg_start) &&
 160             ((mem_start + mem_size) > reg_start)) {
 161                 /* Guarantee that the memory partition doesn't overlap the
 162                  * registers partition */
 163                 wl1251_debug(DEBUG_SPI, "End of partition[0] is "
 164                              "overlapping partition[1].  Adjusted.");
 165                 mem_size = reg_start - mem_start;
 166                 wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 167                              mem_start, mem_size);
 168                 wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 169                              reg_start, reg_size);
 170         } else if ((reg_start < mem_start) &&
 171                    ((reg_start + reg_size) > mem_start)) {
 172                 /* Guarantee that the register partition doesn't overlap the
 173                  * memory partition */
 174                 wl1251_debug(DEBUG_SPI, "End of partition[1] is"
 175                              " overlapping partition[0].  Adjusted.");
 176                 reg_size = mem_start - reg_start;
 177                 wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 178                              mem_start, mem_size);
 179                 wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 180                              reg_start, reg_size);
 181         }
 182
 183         partition[0].start = mem_start;
 184         partition[0].size  = mem_size;
 185         partition[1].start = reg_start;
 186         partition[1].size  = reg_size;
 187
 188         wl->physical_mem_addr = mem_start;
 189         wl->physical_reg_addr = reg_start;
 190
 191         wl->virtual_mem_addr = 0;
 192         wl->virtual_reg_addr = mem_size;
 193
 194         wl->if_ops->write(wl, HW_ACCESS_PART0_SIZE_ADDR, partition,
 195                 sizeof(partition));
 196 }