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 */
 13static 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
 27static 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
 44static int wl1251_translate_mem_addr(struct wl1251 *wl, int addr)
 45{
 46	return addr - wl->physical_mem_addr + wl->virtual_mem_addr;
 47}
 48
 49void 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
 58void 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
 67u32 wl1251_mem_read32(struct wl1251 *wl, int addr)
 68{
 69	return wl1251_read32(wl, wl1251_translate_mem_addr(wl, addr));
 70}
 71
 72void wl1251_mem_write32(struct wl1251 *wl, int addr, u32 val)
 73{
 74	wl1251_write32(wl, wl1251_translate_mem_addr(wl, addr), val);
 75}
 76
 77u32 wl1251_reg_read32(struct wl1251 *wl, int addr)
 78{
 79	return wl1251_read32(wl, wl1251_translate_reg_addr(wl, addr));
 80}
 81
 82void 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 */
120void 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}