LXR linux/drivers/net/wireless/ti/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 */
  27static 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
  41static 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
  58static int wl1251_translate_mem_addr(struct wl1251 *wl, int addr)
  59{
  60        return addr - wl->physical_mem_addr + wl->virtual_mem_addr;
  61}
  62
  63void 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
  72void 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
  81u32 wl1251_mem_read32(struct wl1251 *wl, int addr)
  82{
  83        return wl1251_read32(wl, wl1251_translate_mem_addr(wl, addr));
  84}
  85
  86void wl1251_mem_write32(struct wl1251 *wl, int addr, u32 val)
  87{
  88        wl1251_write32(wl, wl1251_translate_mem_addr(wl, addr), val);
  89}
  90
  91u32 wl1251_reg_read32(struct wl1251 *wl, int addr)
  92{
  93        return wl1251_read32(wl, wl1251_translate_reg_addr(wl, addr));
  94}
  95
  96void 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 */
 134void 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}
 195