drivers/net/wireless/ti/wl1251/io.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This file is part of wl12xx
   4  *
   5  * Copyright (C) 2008 Nokia Corporation
   6  */
   7
   8 #include "wl1251.h"
   9 #include "reg.h"
  10 #include "io.h"
  11
  12 /* FIXME: this is static data nowadays and the table can be removed */
  13 static enum wl12xx_acx_int_reg wl1251_io_reg_table[ACX_REG_TABLE_LEN] = {
  14         [ACX_REG_INTERRUPT_TRIG]     = (REGISTERS_BASE + 0x0474),
  15         [ACX_REG_INTERRUPT_TRIG_H]   = (REGISTERS_BASE + 0x0478),
  16         [ACX_REG_INTERRUPT_MASK]     = (REGISTERS_BASE + 0x0494),
  17         [ACX_REG_HINT_MASK_SET]      = (REGISTERS_BASE + 0x0498),
  18         [ACX_REG_HINT_MASK_CLR]      = (REGISTERS_BASE + 0x049C),
  19         [ACX_REG_INTERRUPT_NO_CLEAR] = (REGISTERS_BASE + 0x04B0),
  20         [ACX_REG_INTERRUPT_CLEAR]    = (REGISTERS_BASE + 0x04A4),
  21         [ACX_REG_INTERRUPT_ACK]      = (REGISTERS_BASE + 0x04A8),
  22         [ACX_REG_SLV_SOFT_RESET]     = (REGISTERS_BASE + 0x0000),
  23         [ACX_REG_EE_START]           = (REGISTERS_BASE + 0x080C),
  24         [ACX_REG_ECPU_CONTROL]       = (REGISTERS_BASE + 0x0804)
  25 };
  26
  27 static int wl1251_translate_reg_addr(struct wl1251 *wl, int addr)
  28 {
  29         /* If the address is lower than REGISTERS_BASE, it means that this is
  30          * a chip-specific register address, so look it up in the registers
  31          * table */
  32         if (addr < REGISTERS_BASE) {
  33                 /* Make sure we don't go over the table */
  34                 if (addr >= ACX_REG_TABLE_LEN) {
  35                         wl1251_error("address out of range (%d)", addr);
  36                         return -EINVAL;
  37                 }
  38                 addr = wl1251_io_reg_table[addr];
  39         }
  40
  41         return addr - wl->physical_reg_addr + wl->virtual_reg_addr;
  42 }
  43
  44 static int wl1251_translate_mem_addr(struct wl1251 *wl, int addr)
  45 {
  46         return addr - wl->physical_mem_addr + wl->virtual_mem_addr;
  47 }
  48
  49 void wl1251_mem_read(struct wl1251 *wl, int addr, void *buf, size_t len)
  50 {
  51         int physical;
  52
  53         physical = wl1251_translate_mem_addr(wl, addr);
  54
  55         wl->if_ops->read(wl, physical, buf, len);
  56 }
  57
  58 void wl1251_mem_write(struct wl1251 *wl, int addr, void *buf, size_t len)
  59 {
  60         int physical;
  61
  62         physical = wl1251_translate_mem_addr(wl, addr);
  63
  64         wl->if_ops->write(wl, physical, buf, len);
  65 }
  66
  67 u32 wl1251_mem_read32(struct wl1251 *wl, int addr)
  68 {
  69         return wl1251_read32(wl, wl1251_translate_mem_addr(wl, addr));
  70 }
  71
  72 void wl1251_mem_write32(struct wl1251 *wl, int addr, u32 val)
  73 {
  74         wl1251_write32(wl, wl1251_translate_mem_addr(wl, addr), val);
  75 }
  76
  77 u32 wl1251_reg_read32(struct wl1251 *wl, int addr)
  78 {
  79         return wl1251_read32(wl, wl1251_translate_reg_addr(wl, addr));
  80 }
  81
  82 void wl1251_reg_write32(struct wl1251 *wl, int addr, u32 val)
  83 {
  84         wl1251_write32(wl, wl1251_translate_reg_addr(wl, addr), val);
  85 }
  86
  87 /* Set the partitions to access the chip addresses.
  88  *
  89  * There are two VIRTUAL partitions (the memory partition and the
  90  * registers partition), which are mapped to two different areas of the
  91  * PHYSICAL (hardware) memory.  This function also makes other checks to
  92  * ensure that the partitions are not overlapping.  In the diagram below, the
  93  * memory partition comes before the register partition, but the opposite is
  94  * also supported.
  95  *
  96  *                               PHYSICAL address
  97  *                                     space
  98  *
  99  *                                    |    |
 100  *                                 ...+----+--> mem_start
 101  *          VIRTUAL address     ...   |    |
 102  *               space       ...      |    | [PART_0]
 103  *                        ...         |    |
 104  * 0x00000000 <--+----+...         ...+----+--> mem_start + mem_size
 105  *               |    |         ...   |    |
 106  *               |MEM |      ...      |    |
 107  *               |    |   ...         |    |
 108  *  part_size <--+----+...            |    | {unused area)
 109  *               |    |   ...         |    |
 110  *               |REG |      ...      |    |
 111  *  part_size    |    |         ...   |    |
 112  *      +     <--+----+...         ...+----+--> reg_start
 113  *  reg_size              ...         |    |
 114  *                           ...      |    | [PART_1]
 115  *                              ...   |    |
 116  *                                 ...+----+--> reg_start + reg_size
 117  *                                    |    |
 118  *
 119  */
 120 void wl1251_set_partition(struct wl1251 *wl,
 121                           u32 mem_start, u32 mem_size,
 122                           u32 reg_start, u32 reg_size)
 123 {
 124         struct wl1251_partition_set *partition;
 125
 126         partition = kmalloc(sizeof(*partition), GFP_KERNEL);
 127         if (!partition) {
 128                 wl1251_error("can not allocate partition buffer");
 129                 return;
 130         }
 131
 132         wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 133                      mem_start, mem_size);
 134         wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 135                      reg_start, reg_size);
 136
 137         /* Make sure that the two partitions together don't exceed the
 138          * address range */
 139         if ((mem_size + reg_size) > HW_ACCESS_MEMORY_MAX_RANGE) {
 140                 wl1251_debug(DEBUG_SPI, "Total size exceeds maximum virtual"
 141                              " address range.  Truncating partition[0].");
 142                 mem_size = HW_ACCESS_MEMORY_MAX_RANGE - reg_size;
 143                 wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 144                              mem_start, mem_size);
 145                 wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 146                              reg_start, reg_size);
 147         }
 148
 149         if ((mem_start < reg_start) &&
 150             ((mem_start + mem_size) > reg_start)) {
 151                 /* Guarantee that the memory partition doesn't overlap the
 152                  * registers partition */
 153                 wl1251_debug(DEBUG_SPI, "End of partition[0] is "
 154                              "overlapping partition[1].  Adjusted.");
 155                 mem_size = reg_start - mem_start;
 156                 wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 157                              mem_start, mem_size);
 158                 wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 159                              reg_start, reg_size);
 160         } else if ((reg_start < mem_start) &&
 161                    ((reg_start + reg_size) > mem_start)) {
 162                 /* Guarantee that the register partition doesn't overlap the
 163                  * memory partition */
 164                 wl1251_debug(DEBUG_SPI, "End of partition[1] is"
 165                              " overlapping partition[0].  Adjusted.");
 166                 reg_size = mem_start - reg_start;
 167                 wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 168                              mem_start, mem_size);
 169                 wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 170                              reg_start, reg_size);
 171         }
 172
 173         partition->mem.start = mem_start;
 174         partition->mem.size  = mem_size;
 175         partition->reg.start = reg_start;
 176         partition->reg.size  = reg_size;
 177
 178         wl->physical_mem_addr = mem_start;
 179         wl->physical_reg_addr = reg_start;
 180
 181         wl->virtual_mem_addr = 0;
 182         wl->virtual_reg_addr = mem_size;
 183
 184         wl->if_ops->write(wl, HW_ACCESS_PART0_SIZE_ADDR, partition,
 185                 sizeof(*partition));
 186
 187         kfree(partition);
 188 }