drivers/net/wireless/wl12xx/io.c

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2008-2010 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@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 <linux/module.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/crc7.h>
  27 #include <linux/spi/spi.h>
  28
  29 #include "wl12xx.h"
  30 #include "wl12xx_80211.h"
  31 #include "io.h"
  32 #include "tx.h"
  33
  34 #define OCP_CMD_LOOP  32
  35
  36 #define OCP_CMD_WRITE 0x1
  37 #define OCP_CMD_READ  0x2
  38
  39 #define OCP_READY_MASK  BIT(18)
  40 #define OCP_STATUS_MASK (BIT(16) | BIT(17))
  41
  42 #define OCP_STATUS_NO_RESP    0x00000
  43 #define OCP_STATUS_OK         0x10000
  44 #define OCP_STATUS_REQ_FAILED 0x20000
  45 #define OCP_STATUS_RESP_ERROR 0x30000
  46
  47 bool wl1271_set_block_size(struct wl1271 *wl)
  48 {
  49         if (wl->if_ops->set_block_size) {
  50                 wl->if_ops->set_block_size(wl, WL12XX_BUS_BLOCK_SIZE);
  51                 return true;
  52         }
  53
  54         return false;
  55 }
  56
  57 void wl1271_disable_interrupts(struct wl1271 *wl)
  58 {
  59         wl->if_ops->disable_irq(wl);
  60 }
  61
  62 void wl1271_enable_interrupts(struct wl1271 *wl)
  63 {
  64         wl->if_ops->enable_irq(wl);
  65 }
  66
  67 /* Set the SPI partitions to access the chip addresses
  68  *
  69  * To simplify driver code, a fixed (virtual) memory map is defined for
  70  * register and memory addresses. Because in the chipset, in different stages
  71  * of operation, those addresses will move around, an address translation
  72  * mechanism is required.
  73  *
  74  * There are four partitions (three memory and one register partition),
  75  * which are mapped to two different areas of the hardware memory.
  76  *
  77  *                                Virtual address
  78  *                                     space
  79  *
  80  *                                    |    |
  81  *                                 ...+----+--> mem.start
  82  *          Physical address    ...   |    |
  83  *               space       ...      |    | [PART_0]
  84  *                        ...         |    |
  85  *  00000000  <--+----+...         ...+----+--> mem.start + mem.size
  86  *               |    |         ...   |    |
  87  *               |MEM |      ...      |    |
  88  *               |    |   ...         |    |
  89  *  mem.size  <--+----+...            |    | {unused area)
  90  *               |    |   ...         |    |
  91  *               |REG |      ...      |    |
  92  *  mem.size     |    |         ...   |    |
  93  *      +     <--+----+...         ...+----+--> reg.start
  94  *  reg.size     |    |   ...         |    |
  95  *               |MEM2|      ...      |    | [PART_1]
  96  *               |    |         ...   |    |
  97  *                                 ...+----+--> reg.start + reg.size
  98  *                                    |    |
  99  *
 100  */
 101 int wl1271_set_partition(struct wl1271 *wl,
 102                          struct wl1271_partition_set *p)
 103 {
 104         /* copy partition info */
 105         memcpy(&wl->part, p, sizeof(*p));
 106
 107         wl1271_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
 108                      p->mem.start, p->mem.size);
 109         wl1271_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
 110                      p->reg.start, p->reg.size);
 111         wl1271_debug(DEBUG_SPI, "mem2_start %08X mem2_size %08X",
 112                      p->mem2.start, p->mem2.size);
 113         wl1271_debug(DEBUG_SPI, "mem3_start %08X mem3_size %08X",
 114                      p->mem3.start, p->mem3.size);
 115
 116         /* write partition info to the chipset */
 117         wl1271_raw_write32(wl, HW_PART0_START_ADDR, p->mem.start);
 118         wl1271_raw_write32(wl, HW_PART0_SIZE_ADDR, p->mem.size);
 119         wl1271_raw_write32(wl, HW_PART1_START_ADDR, p->reg.start);
 120         wl1271_raw_write32(wl, HW_PART1_SIZE_ADDR, p->reg.size);
 121         wl1271_raw_write32(wl, HW_PART2_START_ADDR, p->mem2.start);
 122         wl1271_raw_write32(wl, HW_PART2_SIZE_ADDR, p->mem2.size);
 123         wl1271_raw_write32(wl, HW_PART3_START_ADDR, p->mem3.start);
 124
 125         return 0;
 126 }
 127 EXPORT_SYMBOL_GPL(wl1271_set_partition);
 128
 129 void wl1271_io_reset(struct wl1271 *wl)
 130 {
 131         if (wl->if_ops->reset)
 132                 wl->if_ops->reset(wl);
 133 }
 134
 135 void wl1271_io_init(struct wl1271 *wl)
 136 {
 137         if (wl->if_ops->init)
 138                 wl->if_ops->init(wl);
 139 }
 140
 141 void wl1271_top_reg_write(struct wl1271 *wl, int addr, u16 val)
 142 {
 143         /* write address >> 1 + 0x30000 to OCP_POR_CTR */
 144         addr = (addr >> 1) + 0x30000;
 145         wl1271_write32(wl, OCP_POR_CTR, addr);
 146
 147         /* write value to OCP_POR_WDATA */
 148         wl1271_write32(wl, OCP_DATA_WRITE, val);
 149
 150         /* write 1 to OCP_CMD */
 151         wl1271_write32(wl, OCP_CMD, OCP_CMD_WRITE);
 152 }
 153
 154 u16 wl1271_top_reg_read(struct wl1271 *wl, int addr)
 155 {
 156         u32 val;
 157         int timeout = OCP_CMD_LOOP;
 158
 159         /* write address >> 1 + 0x30000 to OCP_POR_CTR */
 160         addr = (addr >> 1) + 0x30000;
 161         wl1271_write32(wl, OCP_POR_CTR, addr);
 162
 163         /* write 2 to OCP_CMD */
 164         wl1271_write32(wl, OCP_CMD, OCP_CMD_READ);
 165
 166         /* poll for data ready */
 167         do {
 168                 val = wl1271_read32(wl, OCP_DATA_READ);
 169         } while (!(val & OCP_READY_MASK) && --timeout);
 170
 171         if (!timeout) {
 172                 wl1271_warning("Top register access timed out.");
 173                 return 0xffff;
 174         }
 175
 176         /* check data status and return if OK */
 177         if ((val & OCP_STATUS_MASK) == OCP_STATUS_OK)
 178                 return val & 0xffff;
 179         else {
 180                 wl1271_warning("Top register access returned error.");
 181                 return 0xffff;
 182         }
 183 }
 184