drivers/net/wireless/wl1251/io.c

   1 /*
   2  * This file is part of wl12xx
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18  * 02110-1301 USA
  19  *
  20  */
  21
  22 #include "wl1251.h"
  23 #include "reg.h"
  24 #include "io.h"
  25
  26 /* FIXME: this is static data nowadays and the table can be removed */
  27 static enum wl12xx_acx_int_reg wl1251_io_reg_table[ACX_REG_TABLE_LEN] = {
  28         [ACX_REG_INTERRUPT_TRIG]     = (REGISTERS_BASE + 0x0474),
  29         [ACX_REG_INTERRUPT_TRIG_H]   = (REGISTERS_BASE + 0x0478),
  30         [ACX_REG_INTERRUPT_MASK]     = (REGISTERS_BASE + 0x0494),
  31         [ACX_REG_HINT_MASK_SET]      = (REGISTERS_BASE + 0x0498),
  32         [ACX_REG_HINT_MASK_CLR]      = (REGISTERS_BASE + 0x049C),
  33         [ACX_REG_INTERRUPT_NO_CLEAR] = (REGISTERS_BASE + 0x04B0),
  34         [ACX_REG_INTERRUPT_CLEAR]    = (REGISTERS_BASE + 0x04A4),
  35         [ACX_REG_INTERRUPT_ACK]      = (REGISTERS_BASE + 0x04A8),
  36         [ACX_REG_SLV_SOFT_RESET]     = (REGISTERS_BASE + 0x0000),
  37         [ACX_REG_EE_START]           = (REGISTERS_BASE + 0x080C),
  38         [ACX_REG_ECPU_CONTROL]       = (REGISTERS_BASE + 0x0804)
  39 };
  40
  41 static int wl1251_translate_reg_addr(struct wl1251 *wl, int addr)
  42 {
  43         /* If the address is lower than REGISTERS_BASE, it means that this is
  44          * a chip-specific register address, so look it up in the registers
  45          * table */
  46         if (addr < REGISTERS_BASE) {
  47                 /* Make sure we don't go over the table */
  48                 if (addr >= ACX_REG_TABLE_LEN) {
  49                         wl1251_error("address out of range (%d)", addr);
  50                         return -EINVAL;
  51                 }
  52                 addr = wl1251_io_reg_table[addr];
  53         }
  54
  55         return addr - wl->physical_reg_addr + wl->virtual_reg_addr;
  56 }
  57
  58 static int wl1251_translate_mem_addr(struct wl1251 *wl, int addr)
  59 {
  60         return addr - wl->physical_mem_addr + wl->virtual_mem_addr;
  61 }
  62
  63 void wl1251_mem_read(struct wl1251 *wl, int addr, void *buf, size_t len)
  64 {
  65         int physical;
  66
  67         physical = wl1251_translate_mem_addr(wl, addr);
  68
  69         wl->if_ops->read(wl, physical, buf, len);
  70 }
  71
  72 void wl1251_mem_write(struct wl1251 *wl, int addr, void *buf, size_t len)
  73 {
  74         int physical;
  75
  76         physical = wl1251_translate_mem_addr(wl, addr);
  77
  78         wl->if_ops->write(wl, physical, buf, len);
  79 }
  80
  81 u32 wl1251_mem_read32(struct wl1251 *wl, int addr)
  82 {
  83         return wl1251_read32(wl, wl1251_translate_mem_addr(wl, addr));
  84 }
  85
  86 void wl1251_mem_write32(struct wl1251 *wl, int addr, u32 val)
  87 {
  88         wl1251_write32(wl, wl1251_translate_mem_addr(wl, addr), val);
  89 }
  90
  91 u32 wl1251_reg_read32(struct wl1251 *wl, int addr)
  92 {
  93         return wl1251_read32(wl, wl1251_translate_reg_addr(wl, addr));
  94 }
  95
  96 void wl1251_reg_write32(struct wl1251 *wl, int addr, u32 val)
  97 {
  98         wl1251_write32(wl, wl1251_translate_reg_addr(wl, addr), val);
  99 }
 100
 101 /* Set the partitions to access the chip addresses.
 102  *
 103  * There are two VIRTUAL partitions (the memory partition and the
 104  * registers partition), which are mapped to two different areas of the
 105  * PHYSICAL (hardware) memory.  This function also makes other checks to
 106  * ensure that the partitions are not overlapping.  In the diagram below, the
 107  * memory partition comes before the register partition, but the opposite is
 108  * also supported.
 109  *
 110  *                               PHYSICAL address
 111  *                                     space
 112  *
 113  *                                    |    |
 114  *                                 ...+----+--> mem_start
 115  *          VIRTUAL address     ...   |    |
 116  *               space       ...      |    | [PART_0]
 117  *                        ...         |    |
 118  * 0x00000000 <--+----+...         ...+----+--> mem_start + mem_size
 119  *               |    |         ...   |    |
 120  *               |MEM |      ...      |    |
 121  *               |    |   ...         |    |
 122  *  part_size <--+----+...            |    | {unused area)
 123  *               |    |   ...         |    |
 124  *               |REG |      ...      |    |
 125  *  part_size    |    |         ...   |    |
 126  *      +     <--+----+...         ...+----+--> reg_start
 127  *  reg_size              ...         |    |
 128  *                           ...      |    | [PART_1]
 129  *                              ...   |    |
 130  *                                 ...+----+--> reg_start + reg_size
 131  *                                    |    |
 132  *
 133  */
 134 void wl1251_set_partition(struct wl1251 *wl,
 135                           u32 mem_start, u32 mem_size,
 136                           u32 reg_start, u32 reg_size)
 137 {
 138         struct wl1251_partition partition[2];
 139
 140         wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 141                      mem_start, mem_size);
 142         wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 143                      reg_start, reg_size);
 144
 145         /* Make sure that the two partitions together don't exceed the
 146          * address range */
 147         if ((mem_size + reg_size) > HW_ACCESS_MEMORY_MAX_RANGE) {
 148                 wl1251_debug(DEBUG_SPI, "Total size exceeds maximum virtual"
 149                              " address range.  Truncating partition[0].");
 150                 mem_size = HW_ACCESS_MEMORY_MAX_RANGE - reg_size;
 151                 wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 152                              mem_start, mem_size);
 153                 wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 154                              reg_start, reg_size);
 155         }
 156
 157         if ((mem_start < reg_start) &&
 158             ((mem_start + mem_size) > reg_start)) {
 159                 /* Guarantee that the memory partition doesn't overlap the
 160                  * registers partition */
 161                 wl1251_debug(DEBUG_SPI, "End of partition[0] is "
 162                              "overlapping partition[1].  Adjusted.");
 163                 mem_size = reg_start - mem_start;
 164                 wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 165                              mem_start, mem_size);
 166                 wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 167                              reg_start, reg_size);
 168         } else if ((reg_start < mem_start) &&
 169                    ((reg_start + reg_size) > mem_start)) {
 170                 /* Guarantee that the register partition doesn't overlap the
 171                  * memory partition */
 172                 wl1251_debug(DEBUG_SPI, "End of partition[1] is"
 173                              " overlapping partition[0].  Adjusted.");
 174                 reg_size = mem_start - reg_start;
 175                 wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 176                              mem_start, mem_size);
 177                 wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 178                              reg_start, reg_size);
 179         }
 180
 181         partition[0].start = mem_start;
 182         partition[0].size  = mem_size;
 183         partition[1].start = reg_start;
 184         partition[1].size  = reg_size;
 185
 186         wl->physical_mem_addr = mem_start;
 187         wl->physical_reg_addr = reg_start;
 188
 189         wl->virtual_mem_addr = 0;
 190         wl->virtual_reg_addr = mem_size;
 191
 192         wl->if_ops->write(wl, HW_ACCESS_PART0_SIZE_ADDR, partition,
 193                 sizeof(partition));
 194 }