2 * carl9170 firmware - used by the ar9170 wireless device
4 * initialization and main() loop
6 * Copyright (c) 2000-2005 ZyDAS Technology Corporation
7 * Copyright (c) 2007-2009 Atheros Communications, Inc.
8 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2009, 2010 Christian Lamparter <chunkeey@googlemail.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
33 #define AR9170_WATCH_DOG_TIMER 0x100
35 static void timer_init(const unsigned int timer, const unsigned int interval)
37 /* Set timer to periodic mode */
38 orl(AR9170_TIMER_REG_CONTROL, BIT(timer));
40 /* Set time interval */
41 set(AR9170_TIMER_REG_TIMER0 + (timer << 2), interval - 1);
43 /* Clear timer interrupt flag */
44 orl(AR9170_TIMER_REG_INTERRUPT, BIT(timer));
47 static void init(void)
51 #ifdef CONFIG_CARL9170FW_DEBUG_UART
53 #endif /* CONFIG_CARL9170FW_DEBUG_UART */
55 /* 25/50/100ms timer (depends on cpu clock) */
61 /* initialize DMA memory */
62 memset(&dma_mem, 0, sizeof(dma_mem));
65 dma_init_descriptors();
67 /* clear all interrupt */
68 set(AR9170_MAC_REG_INT_CTRL, 0xffff);
70 orl(AR9170_MAC_REG_AFTER_PNP, 1);
72 /* Init watch dog control flag */
73 #ifdef CONFIG_CARL9170FW_WATCHDOG
74 fw.watchdog_enable = 1;
76 set(AR9170_TIMER_REG_WATCH_DOG, AR9170_WATCH_DOG_TIMER);
78 fw.watchdog_enable = 0;
79 set(AR9170_TIMER_REG_WATCH_DOG, 0xffff);
80 #endif /* CONFIG_CARL9170FW_WATCHDOG */
82 #ifdef CONFIG_CARL9170FW_GPIO_INTERRUPT
83 fw.cached_gpio_state.gpio = get(AR9170_GPIO_REG_PORT_DATA) &
85 #endif /* CONFIG_CARL9170FW_GPIO_INTERRUPT */
87 /* this will get the downqueue moving. */
91 static void handle_fw(void)
93 if (fw.watchdog_enable == 1)
94 set(AR9170_TIMER_REG_WATCH_DOG, AR9170_WATCH_DOG_TIMER);
100 static void timer0_isr(void)
104 #ifdef CONFIG_CARL9170FW_GPIO_INTERRUPT
106 #endif /* CONFIG_CARL9170FW_GPIO_INTERRUPT */
108 #ifdef CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT
109 set(AR9170_GPIO_REG_PORT_DATA, get(AR9170_GPIO_REG_PORT_DATA) ^ 1);
110 #endif /* CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT */
113 static void handle_timer(void)
117 intr = get(AR9170_TIMER_REG_INTERRUPT);
119 /* ACK timer interrupt */
120 set(AR9170_TIMER_REG_INTERRUPT, intr);
122 #define HANDLER(intr, flag, func) \
124 if ((intr & flag) != 0) { \
130 HANDLER(intr, BIT(0), timer0_isr);
133 DBG("Unhandled Timer Event %x", (unsigned int) intr);
138 static void __noreturn main_loop(void)
145 * Due to frame order persevation, the wlan subroutines
146 * must be executed before handle_host_interface.
150 handle_host_interface();
161 * The bootcode will work with the device driver to load the firmware
162 * onto the device's Program SRAM. The Program SRAM has a size of 16 KB
163 * and also contains the stack, which grows down from 0x204000.
165 * The Program SRAM starts at address 0x200000 on the device.
166 * The firmware entry point (0x200004) is located in boot.S.
167 * we put _start() there with the linker script carl9170.lds.
172 clock_set(true, AHB_40MHZ_OSC);
174 /* watchdog magic pattern check */
175 if ((get(AR9170_PWR_REG_WATCH_DOG_MAGIC) & 0xffff0000) == 0x12340000) {
176 /* watch dog warm start */
177 incl(AR9170_PWR_REG_WATCH_DOG_MAGIC);
179 } else if ((get(AR9170_PWR_REG_WATCH_DOG_MAGIC) & 0xffff0000) == 0x98760000) {
183 /* write the magic pattern for watch dog */
184 andl(AR9170_PWR_REG_WATCH_DOG_MAGIC, 0xFFFF);
185 orl(AR9170_PWR_REG_WATCH_DOG_MAGIC, 0x12340000);
189 #ifdef CONFIG_CARL9170FW_DEBUG
192 BUG_ON(0x2b || !0x2b);
193 INFO("INFO MESSAGE");
195 /* a set of unique characters to detect transfer data corruptions */
196 DBG("AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz"
197 " ~`!1@2#3$4%%5^6&7*8(9)0_-+={[}]|\\:;\"'<,>.?/");
198 #endif /* CONFIG_CARL9170FW_DEBUG */
201 * Tell the host, that the firmware has booted and is
202 * now ready to process requests.
204 send_cmd_to_host(0, CARL9170_RSP_BOOT, 0x00, NULL);