Linux Kernel  3.7.1
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io.c
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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 }
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