1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2003 Atheros Communications, Inc., All Rights Reserved.
7 * Copyright (C) 2006 FON Technology, SL.
8 * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
9 * Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
10 */
11
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <asm/irq_cpu.h>
15 #include <asm/reboot.h>
16 #include <asm/bootinfo.h>
17 #include <asm/time.h>
18
19 #include <ath25_platform.h>
20 #include "devices.h"
21 #include "ar5312.h"
22 #include "ar2315.h"
23
24 void (*ath25_irq_dispatch)(void);
25
26 static inline bool check_radio_magic(const void __iomem *addr)
27 {
28 addr += 0x7a; /* offset for flash magic */
29 return (__raw_readb(addr) == 0x5a) && (__raw_readb(addr + 1) == 0xa5);
30 }
31
32 static inline bool check_notempty(const void __iomem *addr)
33 {
34 return __raw_readl(addr) != 0xffffffff;
35 }
36
37 static inline bool check_board_data(const void __iomem *addr, bool broken)
38 {
39 /* config magic found */
40 if (__raw_readl(addr) == ATH25_BD_MAGIC)
41 return true;
42
43 if (!broken)
44 return false;
45
46 /* broken board data detected, use radio data to find the
47 * offset, user will fix this */
48
49 if (check_radio_magic(addr + 0x1000))
50 return true;
51 if (check_radio_magic(addr + 0xf8))
52 return true;
53
54 return false;
55 }
56
57 static const void __iomem * __init find_board_config(const void __iomem *limit,
58 const bool broken)
59 {
60 const void __iomem *addr;
61 const void __iomem *begin = limit - 0x1000;
62 const void __iomem *end = limit - 0x30000;
63
64 for (addr = begin; addr >= end; addr -= 0x1000)
65 if (check_board_data(addr, broken))
66 return addr;
67
68 return NULL;
69 }
70
71 static const void __iomem * __init find_radio_config(const void __iomem *limit,
72 const void __iomem *bcfg)
73 {
74 const void __iomem *rcfg, *begin, *end;
75
76 /*
77 * Now find the start of Radio Configuration data, using heuristics:
78 * Search forward from Board Configuration data by 0x1000 bytes
79 * at a time until we find non-0xffffffff.
80 */
81 begin = bcfg + 0x1000;
82 end = limit;
83 for (rcfg = begin; rcfg < end; rcfg += 0x1000)
84 if (check_notempty(rcfg) && check_radio_magic(rcfg))
85 return rcfg;
86
87 /* AR2316 relocates radio config to new location */
88 begin = bcfg + 0xf8;
89 end = limit - 0x1000 + 0xf8;
90 for (rcfg = begin; rcfg < end; rcfg += 0x1000)
91 if (check_notempty(rcfg) && check_radio_magic(rcfg))
92 return rcfg;
93
94 return NULL;
95 }
96
97 /*
98 * NB: Search region size could be larger than the actual flash size,
99 * but this shouldn't be a problem here, because the flash
100 * will simply be mapped multiple times.
101 */
102 int __init ath25_find_config(phys_addr_t base, unsigned long size)
103 {
104 const void __iomem *flash_base, *flash_limit;
105 struct ath25_boarddata *config;
106 unsigned int rcfg_size;
107 int broken_boarddata = 0;
108 const void __iomem *bcfg, *rcfg;
109 u8 *board_data;
110 u8 *radio_data;
111 u8 *mac_addr;
112 u32 offset;
113
114 flash_base = ioremap(base, size);
115 flash_limit = flash_base + size;
116
117 ath25_board.config = NULL;
118 ath25_board.radio = NULL;
119
120 /* Copy the board and radio data to RAM, because accessing the mapped
121 * memory of the flash directly after booting is not safe */
122
123 /* Try to find valid board and radio data */
124 bcfg = find_board_config(flash_limit, false);
125
126 /* If that fails, try to at least find valid radio data */
127 if (!bcfg) {
128 bcfg = find_board_config(flash_limit, true);
129 broken_boarddata = 1;
130 }
131
132 if (!bcfg) {
133 pr_warn("WARNING: No board configuration data found!\n");
134 goto error;
135 }
136
137 board_data = kzalloc(BOARD_CONFIG_BUFSZ, GFP_KERNEL);
138 if (!board_data)
139 goto error;
140 ath25_board.config = (struct ath25_boarddata *)board_data;
141 memcpy_fromio(board_data, bcfg, 0x100);
142 if (broken_boarddata) {
143 pr_warn("WARNING: broken board data detected\n");
144 config = ath25_board.config;
145 if (is_zero_ether_addr(config->enet0_mac)) {
146 pr_info("Fixing up empty mac addresses\n");
147 config->reset_config_gpio = 0xffff;
148 config->sys_led_gpio = 0xffff;
149 eth_random_addr(config->wlan0_mac);
150 config->wlan0_mac[0] &= ~0x06;
151 eth_random_addr(config->enet0_mac);
152 eth_random_addr(config->enet1_mac);
153 }
154 }
155
156 /* Radio config starts 0x100 bytes after board config, regardless
157 * of what the physical layout on the flash chip looks like */
158
159 rcfg = find_radio_config(flash_limit, bcfg);
160 if (!rcfg) {
161 pr_warn("WARNING: Could not find Radio Configuration data\n");
162 goto error;
163 }
164
165 radio_data = board_data + 0x100 + ((rcfg - bcfg) & 0xfff);
166 ath25_board.radio = radio_data;
167 offset = radio_data - board_data;
168 pr_info("Radio config found at offset 0x%x (0x%x)\n", rcfg - bcfg,
169 offset);
170 rcfg_size = BOARD_CONFIG_BUFSZ - offset;
171 memcpy_fromio(radio_data, rcfg, rcfg_size);
172
173 mac_addr = &radio_data[0x1d * 2];
174 if (is_broadcast_ether_addr(mac_addr)) {
175 pr_info("Radio MAC is blank; using board-data\n");
176 ether_addr_copy(mac_addr, ath25_board.config->wlan0_mac);
177 }
178
179 iounmap(flash_base);
180
181 return 0;
182
183 error:
184 iounmap(flash_base);
185 return -ENODEV;
186 }
187
188 static void ath25_halt(void)
189 {
190 local_irq_disable();
191 unreachable();
192 }
193
194 void __init plat_mem_setup(void)
195 {
196 _machine_halt = ath25_halt;
197 pm_power_off = ath25_halt;
198
199 if (is_ar5312())
200 ar5312_plat_mem_setup();
201 else
202 ar2315_plat_mem_setup();
203
204 /* Disable data watchpoints */
205 write_c0_watchlo0(0);
206 }
207
208 asmlinkage void plat_irq_dispatch(void)
209 {
210 ath25_irq_dispatch();
211 }
212
213 void __init plat_time_init(void)
214 {
215 if (is_ar5312())
216 ar5312_plat_time_init();
217 else
218 ar2315_plat_time_init();
219 }
220
221 unsigned int get_c0_compare_int(void)
222 {
223 return CP0_LEGACY_COMPARE_IRQ;
224 }
225
226 void __init arch_init_irq(void)
227 {
228 clear_c0_status(ST0_IM);
229 mips_cpu_irq_init();
230
231 /* Initialize interrupt controllers */
232 if (is_ar5312())
233 ar5312_arch_init_irq();
234 else
235 ar2315_arch_init_irq();
236 }
237
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