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
24void (*ath25_irq_dispatch)(void);
25
26static 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
32static inline bool check_notempty(const void __iomem *addr)
33{
34	return __raw_readl(addr) != 0xffffffff;
35}
36
37static 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
57static 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
71static 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 */
102int __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_nocache(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	ath25_board.config = (struct ath25_boarddata *)board_data;
139	memcpy_fromio(board_data, bcfg, 0x100);
140	if (broken_boarddata) {
141		pr_warn("WARNING: broken board data detected\n");
142		config = ath25_board.config;
143		if (is_zero_ether_addr(config->enet0_mac)) {
144			pr_info("Fixing up empty mac addresses\n");
145			config->reset_config_gpio = 0xffff;
146			config->sys_led_gpio = 0xffff;
147			random_ether_addr(config->wlan0_mac);
148			config->wlan0_mac[0] &= ~0x06;
149			random_ether_addr(config->enet0_mac);
150			random_ether_addr(config->enet1_mac);
151		}
152	}
153
154	/* Radio config starts 0x100 bytes after board config, regardless
155	 * of what the physical layout on the flash chip looks like */
156
157	rcfg = find_radio_config(flash_limit, bcfg);
158	if (!rcfg) {
159		pr_warn("WARNING: Could not find Radio Configuration data\n");
160		goto error;
161	}
162
163	radio_data = board_data + 0x100 + ((rcfg - bcfg) & 0xfff);
164	ath25_board.radio = radio_data;
165	offset = radio_data - board_data;
166	pr_info("Radio config found at offset 0x%x (0x%x)\n", rcfg - bcfg,
167		offset);
168	rcfg_size = BOARD_CONFIG_BUFSZ - offset;
169	memcpy_fromio(radio_data, rcfg, rcfg_size);
170
171	mac_addr = &radio_data[0x1d * 2];
172	if (is_broadcast_ether_addr(mac_addr)) {
173		pr_info("Radio MAC is blank; using board-data\n");
174		ether_addr_copy(mac_addr, ath25_board.config->wlan0_mac);
175	}
176
177	iounmap(flash_base);
178
179	return 0;
180
181error:
182	iounmap(flash_base);
183	return -ENODEV;
184}
185
186static void ath25_halt(void)
187{
188	local_irq_disable();
189	unreachable();
190}
191
192void __init plat_mem_setup(void)
193{
194	_machine_halt = ath25_halt;
195	pm_power_off = ath25_halt;
196
197	if (is_ar5312())
198		ar5312_plat_mem_setup();
199	else
200		ar2315_plat_mem_setup();
201
202	/* Disable data watchpoints */
203	write_c0_watchlo0(0);
204}
205
206asmlinkage void plat_irq_dispatch(void)
207{
208	ath25_irq_dispatch();
209}
210
211void __init plat_time_init(void)
212{
213	if (is_ar5312())
214		ar5312_plat_time_init();
215	else
216		ar2315_plat_time_init();
217}
218
219unsigned int __cpuinit get_c0_compare_int(void)
220{
221	return CP0_LEGACY_COMPARE_IRQ;
222}
223
224void __init arch_init_irq(void)
225{
226	clear_c0_status(ST0_IM);
227	mips_cpu_irq_init();
228
229	/* Initialize interrupt controllers */
230	if (is_ar5312())
231		ar5312_arch_init_irq();
232	else
233		ar2315_arch_init_irq();
234}
235