xref: /openbmc/linux/drivers/net/wireless/ti/wl1251/io.c (revision 45474475)
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 
wl1251_translate_reg_addr(struct wl1251 * wl,int addr)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 
wl1251_translate_mem_addr(struct wl1251 * wl,int addr)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 
wl1251_mem_read(struct wl1251 * wl,int addr,void * buf,size_t len)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 
wl1251_mem_write(struct wl1251 * wl,int addr,void * buf,size_t len)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 
wl1251_mem_read32(struct wl1251 * wl,int addr)67 u32 wl1251_mem_read32(struct wl1251 *wl, int addr)
68 {
69 	return wl1251_read32(wl, wl1251_translate_mem_addr(wl, addr));
70 }
71 
wl1251_mem_write32(struct wl1251 * wl,int addr,u32 val)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 
wl1251_reg_read32(struct wl1251 * wl,int addr)77 u32 wl1251_reg_read32(struct wl1251 *wl, int addr)
78 {
79 	return wl1251_read32(wl, wl1251_translate_reg_addr(wl, addr));
80 }
81 
wl1251_reg_write32(struct wl1251 * wl,int addr,u32 val)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  */
wl1251_set_partition(struct wl1251 * wl,u32 mem_start,u32 mem_size,u32 reg_start,u32 reg_size)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 }
189