target/linux/atheros/files/arch/mips/atheros/board.c

   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 Felix Fietkau <nbd@openwrt.org>
  10  */
  11
  12 /*
  13  * Platform devices for Atheros SoCs
  14  */
  15
  16 #include <linux/autoconf.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/types.h>
  20 #include <linux/string.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/serial.h>
  24 #include <linux/serial_core.h>
  25 #include <asm/bootinfo.h>
  26 #include <asm/irq_cpu.h>
  27 #include <asm/io.h>
  28 #include <ar531x.h>
  29
  30 char *board_config, *radio_config;
  31
  32 extern int early_serial_setup(struct uart_port *port);
  33
  34 static u8 *find_board_config(char *flash_limit)
  35 {
  36         char *addr;
  37         int found = 0;
  38
  39         for (addr = (char *) (flash_limit - 0x1000);
  40                 addr >= (char *) (flash_limit - 0x30000);
  41                 addr -= 0x1000) {
  42
  43                 if ( *(int *)addr == 0x35333131) {
  44                         /* config magic found */
  45                         found = 1;
  46                         break;
  47                 }
  48         }
  49
  50         if (!found) {
  51                 printk("WARNING: No board configuration data found!\n");
  52                 addr = NULL;
  53         }
  54
  55         return addr;
  56 }
  57
  58 static u8 *find_radio_config(char *flash_limit, char *board_config)
  59 {
  60         int dataFound;
  61         u32 radio_config;
  62
  63         /*
  64          * Now find the start of Radio Configuration data, using heuristics:
  65          * Search forward from Board Configuration data by 0x1000 bytes
  66          * at a time until we find non-0xffffffff.
  67          */
  68         dataFound = 0;
  69         for (radio_config = (u32) board_config + 0x1000;
  70              (radio_config < (u32) flash_limit);
  71              radio_config += 0x1000) {
  72                 if (*(int *)radio_config != 0xffffffff) {
  73                         dataFound = 1;
  74                         break;
  75                 }
  76         }
  77
  78 #ifdef CONFIG_ATHEROS_AR5315
  79         if (!dataFound) { /* AR2316 relocates radio config to new location */
  80             for (radio_config = (u32) board_config + 0xf8;
  81                 (radio_config < (u32) flash_limit - 0x1000 + 0xf8);
  82                          radio_config += 0x1000) {
  83                         if (*(int *)radio_config != 0xffffffff) {
  84                                 dataFound = 1;
  85                                 break;
  86                         }
  87             }
  88         }
  89 #endif
  90
  91         if (!dataFound) {
  92                 printk("Could not find Radio Configuration data\n");
  93                 radio_config = 0;
  94         }
  95
  96         return (u8 *) radio_config;
  97 }
  98
  99 int __init ar531x_find_config(char *flash_limit)
 100 {
 101         unsigned int rcfg_size;
 102         char *bcfg, *rcfg;
 103
 104         /* Copy the board and radio data to RAM, because with the new
 105          * spiflash driver, accessing the mapped memory directly is no
 106          * longer safe */
 107
 108         bcfg = find_board_config(flash_limit);
 109         if (!bcfg)
 110                 return -ENODEV;
 111
 112         board_config = kzalloc(BOARD_CONFIG_BUFSZ, GFP_KERNEL);
 113         memcpy(board_config, bcfg, 0x100);
 114
 115         /* Radio config starts 0x100 bytes after board config, regardless
 116          * of what the physical layout on the flash chip looks like */
 117
 118         rcfg = find_radio_config(flash_limit, bcfg);
 119         if (!rcfg)
 120                 return -ENODEV;
 121
 122         radio_config = board_config + 0x100 + ((rcfg - bcfg) & 0xfff);
 123         printk("Radio config found at offset 0x%x(0x%x)\n", rcfg - bcfg, radio_config - board_config);
 124         rcfg_size = BOARD_CONFIG_BUFSZ - ((rcfg - bcfg) & (BOARD_CONFIG_BUFSZ - 1));
 125         memcpy(radio_config, rcfg, rcfg_size);
 126
 127         return 0;
 128 }
 129
 130 void __init serial_setup(unsigned long mapbase, unsigned int uartclk)
 131 {
 132         struct uart_port s;
 133
 134         memset(&s, 0, sizeof(s));
 135
 136         s.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST;
 137         s.iotype = UPIO_MEM;
 138         s.irq = AR531X_MISC_IRQ_UART0;
 139         s.regshift = 2;
 140         s.mapbase = mapbase;
 141         s.uartclk = uartclk;
 142         s.membase = (void __iomem *)s.mapbase;
 143
 144         early_serial_setup(&s);
 145 }
 146
 147 void __init plat_mem_setup(void)
 148 {
 149         DO_AR5312(ar5312_plat_setup();)
 150         DO_AR5315(ar5315_plat_setup();)
 151
 152         /* Disable data watchpoints */
 153         write_c0_watchlo0(0);
 154 }
 155
 156 const char *get_system_type(void)
 157 {
 158         switch (mips_machtype) {
 159 #ifdef CONFIG_ATHEROS_AR5312
 160         case MACH_ATHEROS_AR5312:
 161                 return "Atheros AR5312";
 162
 163         case MACH_ATHEROS_AR2312:
 164                 return "Atheros AR2312";
 165
 166         case MACH_ATHEROS_AR2313:
 167                 return "Atheros AR2313";
 168 #endif
 169 #ifdef CONFIG_ATHEROS_AR5315
 170         case MACH_ATHEROS_AR2315:
 171                 return "Atheros AR2315";
 172         case MACH_ATHEROS_AR2316:
 173                 return "Atheros AR2316";
 174         case MACH_ATHEROS_AR2317:
 175                 return "Atheros AR2317";
 176         case MACH_ATHEROS_AR2318:
 177                 return "Atheros AR2318";
 178 #endif
 179         }
 180         return "Atheros (unknown)";
 181 }
 182
 183 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24))
 184 void __init plat_timer_setup(struct irqaction *irq)
 185 {
 186         unsigned int count;
 187
 188         /* Usually irq is timer_irqaction (timer_interrupt) */
 189         setup_irq(AR531X_IRQ_CPU_CLOCK, irq);
 190
 191         /* to generate the first CPU timer interrupt */
 192         count = read_c0_count();
 193         write_c0_compare(count + 1000);
 194 }
 195 #endif
 196
 197 asmlinkage void plat_irq_dispatch(void)
 198 {
 199         DO_AR5312(ar5312_irq_dispatch();)
 200         DO_AR5315(ar5315_irq_dispatch();)
 201 }
 202
 203 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
 204 void (*board_time_init)(void);
 205 void __init plat_time_init(void) {
 206     board_time_init();
 207 }
 208 #endif
 209
 210 void __init arch_init_irq(void)
 211 {
 212         clear_c0_status(ST0_IM);
 213         mips_cpu_irq_init();
 214
 215         /* Initialize interrupt controllers */
 216         DO_AR5312(ar5312_misc_intr_init(AR531X_MISC_IRQ_BASE);)
 217         DO_AR5315(ar5315_misc_intr_init(AR531X_MISC_IRQ_BASE);)
 218 }
 219
 220 static int __init ar531x_register_gpiodev(void)
 221 {
 222         static struct resource res = {
 223                 .start = 0xFFFFFFFF,
 224         };
 225         struct platform_device *pdev;
 226
 227         printk(KERN_INFO "ar531x: Registering GPIODEV device\n");
 228
 229         pdev = platform_device_register_simple("GPIODEV", 0, &res, 1);
 230
 231         if (!pdev) {
 232                 printk(KERN_ERR "ar531x: GPIODEV init failed\n");
 233                 return -ENODEV;
 234         }
 235
 236         return 0;
 237 }
 238
 239 device_initcall(ar531x_register_gpiodev);