Quelle  io.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * This file is part of wl12xx
 *
 * Copyright (C) 2008 Nokia Corporation
 */

#include "wl1251.h"
#include "reg.h"
#include "io.h"

/* FIXME: this is static data nowadays and the table can be removed */
static enum wl12xx_acx_int_reg wl1251_io_reg_table[ACX_REG_TABLE_LEN] = {
 [ACX_REG_INTERRUPT_TRIG]     = (REGISTERS_BASE + 0x0474),
 [ACX_REG_INTERRUPT_TRIG_H]   = (REGISTERS_BASE + 0x0478),
 [ACX_REG_INTERRUPT_MASK]     = (REGISTERS_BASE + 0x0494),
 [ACX_REG_HINT_MASK_SET]      = (REGISTERS_BASE + 0x0498),
 [ACX_REG_HINT_MASK_CLR]      = (REGISTERS_BASE + 0x049C),
 [ACX_REG_INTERRUPT_NO_CLEAR] = (REGISTERS_BASE + 0x04B0),
 [ACX_REG_INTERRUPT_CLEAR]    = (REGISTERS_BASE + 0x04A4),
 [ACX_REG_INTERRUPT_ACK]      = (REGISTERS_BASE + 0x04A8),
 [ACX_REG_SLV_SOFT_RESET]     = (REGISTERS_BASE + 0x0000),
 [ACX_REG_EE_START]           = (REGISTERS_BASE + 0x080C),
 [ACX_REG_ECPU_CONTROL]       = (REGISTERS_BASE + 0x0804)
};

static int wl1251_translate_reg_addr(struct wl1251 *wl, int addr)
{
 /* If the address is lower than REGISTERS_BASE, it means that this is
 * a chip-specific register address, so look it up in the registers
 * table */
 if (addr < REGISTERS_BASE) {
  /* Make sure we don't go over the table */
  if (addr >= ACX_REG_TABLE_LEN) {
   wl1251_error("address out of range (%d)", addr);
   return -EINVAL;
  }
  addr = wl1251_io_reg_table[addr];
 }

 return addr - wl->physical_reg_addr + wl->virtual_reg_addr;
}

static int wl1251_translate_mem_addr(struct wl1251 *wl, int addr)
{
 return addr - wl->physical_mem_addr + wl->virtual_mem_addr;
}

void wl1251_mem_read(struct wl1251 *wl, int addr, void *buf, size_t len)
{
 int physical;

 physical = wl1251_translate_mem_addr(wl, addr);

 wl->if_ops->read(wl, physical, buf, len);
}

void wl1251_mem_write(struct wl1251 *wl, int addr, void *buf, size_t len)
{
 int physical;

 physical = wl1251_translate_mem_addr(wl, addr);

 wl->if_ops->write(wl, physical, buf, len);
}

u32 wl1251_mem_read32(struct wl1251 *wl, int addr)
{
 return wl1251_read32(wl, wl1251_translate_mem_addr(wl, addr));
}

void wl1251_mem_write32(struct wl1251 *wl, int addr, u32 val)
{
 wl1251_write32(wl, wl1251_translate_mem_addr(wl, addr), val);
}

u32 wl1251_reg_read32(struct wl1251 *wl, int addr)
{
 return wl1251_read32(wl, wl1251_translate_reg_addr(wl, addr));
}

void wl1251_reg_write32(struct wl1251 *wl, int addr, u32 val)
{
 wl1251_write32(wl, wl1251_translate_reg_addr(wl, addr), val);
}

/* Set the partitions to access the chip addresses.
 *
 * There are two VIRTUAL partitions (the memory partition and the
 * registers partition), which are mapped to two different areas of the
 * PHYSICAL (hardware) memory.  This function also makes other checks to
 * ensure that the partitions are not overlapping.  In the diagram below, the
 * memory partition comes before the register partition, but the opposite is
 * also supported.
 *
 *                               PHYSICAL address
 *                                     space
 *
 *                                    |    |
 *                                 ...+----+--> mem_start
 *          VIRTUAL address     ...   |    |
 *               space       ...      |    | [PART_0]
 *                        ...         |    |
 * 0x00000000 <--+----+...         ...+----+--> mem_start + mem_size
 *               |    |         ...   |    |
 *               |MEM |      ...      |    |
 *               |    |   ...         |    |
 *  part_size <--+----+...            |    | {unused area)
 *               |    |   ...         |    |
 *               |REG |      ...      |    |
 *  part_size    |    |         ...   |    |
 *      +     <--+----+...         ...+----+--> reg_start
 *  reg_size              ...         |    |
 *                           ...      |    | [PART_1]
 *                              ...   |    |
 *                                 ...+----+--> reg_start + reg_size
 *                                    |    |
 *
 */
void wl1251_set_partition(struct wl1251 *wl,
     u32 mem_start, u32 mem_size,
     u32 reg_start, u32 reg_size)
{
 struct wl1251_partition_set *partition;

 partition = kmalloc(sizeof(*partition), GFP_KERNEL);
 if (!partition) {
  wl1251_error("can not allocate partition buffer");
  return;
 }

 wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
       mem_start, mem_size);
 wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
       reg_start, reg_size);

 /* Make sure that the two partitions together don't exceed the
 * address range */
 if ((mem_size + reg_size) > HW_ACCESS_MEMORY_MAX_RANGE) {
  wl1251_debug(DEBUG_SPI, "Total size exceeds maximum virtual"
        " address range. Truncating partition[0].");
  mem_size = HW_ACCESS_MEMORY_MAX_RANGE - reg_size;
  wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
        mem_start, mem_size);
  wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
        reg_start, reg_size);
 }

 if ((mem_start < reg_start) &&
     ((mem_start + mem_size) > reg_start)) {
  /* Guarantee that the memory partition doesn't overlap the
 * registers partition */
  wl1251_debug(DEBUG_SPI, "End of partition[0] is "
        "overlapping partition[1]. Adjusted.");
  mem_size = reg_start - mem_start;
  wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
        mem_start, mem_size);
  wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
        reg_start, reg_size);
 } else if ((reg_start < mem_start) &&
     ((reg_start + reg_size) > mem_start)) {
  /* Guarantee that the register partition doesn't overlap the
 * memory partition */
  wl1251_debug(DEBUG_SPI, "End of partition[1] is"
        " overlapping partition[0]. Adjusted.");
  reg_size = mem_start - reg_start;
  wl1251_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
        mem_start, mem_size);
  wl1251_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
        reg_start, reg_size);
 }

 partition->mem.start = mem_start;
 partition->mem.size  = mem_size;
 partition->reg.start = reg_start;
 partition->reg.size  = reg_size;

 wl->physical_mem_addr = mem_start;
 wl->physical_reg_addr = reg_start;

 wl->virtual_mem_addr = 0;
 wl->virtual_reg_addr = mem_size;

 wl->if_ops->write(wl, HW_ACCESS_PART0_SIZE_ADDR, partition,
  sizeof(*partition));

 kfree(partition);
}