package/linux/kernel-source/arch/mips/brcm-boards/bcm947xx/setup.c

   1 /*
   2  * Generic setup routines for Broadcom MIPS boards
   3  *
   4  * Copyright 2004, Broadcom Corporation
   5  * All Rights Reserved.
   6  *
   7  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   8  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   9  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  10  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  11  *
  12  * $Id$
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/serialP.h>
  19 #include <linux/ide.h>
  20 #include <asm/bootinfo.h>
  21 #include <asm/time.h>
  22 #include <asm/reboot.h>
  23
  24 #ifdef CONFIG_MTD_PARTITIONS
  25 #include <linux/mtd/mtd.h>
  26 #include <linux/mtd/partitions.h>
  27 #endif
  28
  29 #include <typedefs.h>
  30 #include <bcmutils.h>
  31 #include <bcmnvram.h>
  32 #include <sbmips.h>
  33 #include <sbutils.h>
  34 #include <trxhdr.h>
  35
  36 extern void bcm947xx_time_init(void);
  37 extern void bcm947xx_timer_setup(struct irqaction *irq);
  38
  39 #ifdef CONFIG_REMOTE_DEBUG
  40 extern void set_debug_traps(void);
  41 extern void rs_kgdb_hook(struct serial_state *);
  42 extern void breakpoint(void);
  43 #endif
  44
  45 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
  46 extern struct ide_ops std_ide_ops;
  47 #endif
  48
  49 /* Global SB handle */
  50 void *bcm947xx_sbh = NULL;
  51 spinlock_t bcm947xx_sbh_lock = SPIN_LOCK_UNLOCKED;
  52 EXPORT_SYMBOL(bcm947xx_sbh);
  53 EXPORT_SYMBOL(bcm947xx_sbh_lock);
  54
  55 /* Convenience */
  56 #define sbh bcm947xx_sbh
  57 #define sbh_lock bcm947xx_sbh_lock
  58
  59 /* Kernel command line */
  60 char arcs_cmdline[CL_SIZE] __initdata = CONFIG_CMDLINE;
  61
  62 void
  63 bcm947xx_machine_restart(char *command)
  64 {
  65         printk("Please stand by while rebooting the system...\n");
  66
  67         /* Set the watchdog timer to reset immediately */
  68         __cli();
  69         sb_watchdog(sbh, 1);
  70         while (1);
  71 }
  72
  73 void
  74 bcm947xx_machine_halt(void)
  75 {
  76         printk("System halted\n");
  77
  78         /* Disable interrupts and watchdog and spin forever */
  79         __cli();
  80         sb_watchdog(sbh, 0);
  81         while (1);
  82 }
  83
  84 #ifdef CONFIG_SERIAL
  85
  86 static struct serial_struct rs = {
  87         line: 0,
  88         flags: ASYNC_BOOT_AUTOCONF,
  89         io_type: SERIAL_IO_MEM,
  90 };
  91
  92 static void __init
  93 serial_add(void *regs, uint irq, uint baud_base, uint reg_shift)
  94 {
  95         rs.iomem_base = regs;
  96         rs.irq = irq + 2;
  97         rs.baud_base = baud_base / 16;
  98         rs.iomem_reg_shift = reg_shift;
  99
 100         early_serial_setup(&rs);
 101
 102         rs.line++;
 103 }
 104
 105 static void __init
 106 serial_setup(void *sbh)
 107 {
 108         sb_serial_init(sbh, serial_add);
 109
 110 #ifdef CONFIG_REMOTE_DEBUG
 111         /* Use the last port for kernel debugging */
 112         if (rs.iomem_base)
 113                 rs_kgdb_hook(&rs);
 114 #endif
 115 }
 116
 117 #endif /* CONFIG_SERIAL */
 118
 119 void __init
 120 brcm_setup(void)
 121 {
 122         char *value;
 123
 124         /* Get global SB handle */
 125         sbh = sb_kattach();
 126
 127         /* Initialize clocks and interrupts */
 128         sb_mips_init(sbh);
 129
 130 #ifdef CONFIG_SERIAL
 131         /* Initialize UARTs */
 132         serial_setup(sbh);
 133 #endif
 134
 135 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
 136         ide_ops = &std_ide_ops;
 137 #endif
 138
 139         /* Override default command line arguments */
 140         value = nvram_get("kernel_args");
 141         if (value && strlen(value) && strncmp(value, "empty", 5))
 142                 strncpy(arcs_cmdline, value, sizeof(arcs_cmdline));
 143
 144
 145         /* Generic setup */
 146         _machine_restart = bcm947xx_machine_restart;
 147         _machine_halt = bcm947xx_machine_halt;
 148         _machine_power_off = bcm947xx_machine_halt;
 149
 150         board_time_init = bcm947xx_time_init;
 151         board_timer_setup = bcm947xx_timer_setup;
 152 }
 153
 154 const char *
 155 get_system_type(void)
 156 {
 157         return "Broadcom BCM947XX";
 158 }
 159
 160 void __init
 161 bus_error_init(void)
 162 {
 163 }
 164
 165 #ifdef CONFIG_MTD_PARTITIONS
 166
 167 static struct mtd_partition bcm947xx_parts[] = {
 168         { name: "pmon", offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
 169         { name: "linux", offset: 0, size: 0, },
 170         { name: "rootfs", offset: 0, size: 0, },
 171         { name: "nvram", offset: 0, size: 0, },
 172         { name: "OpenWrt", offset: 0, size: 0, },
 173         { name: NULL, },
 174 };
 175
 176 static int __init
 177 find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
 178 {
 179         struct trx_header *trx;
 180         unsigned char buf[512];
 181         int off;
 182         size_t len;
 183
 184         trx = (struct trx_header *) buf;
 185
 186         for (off = (256*1024); off < size; off += mtd->erasesize) {
 187                 memset(buf, 0xe5, sizeof(buf));
 188
 189                 /*
 190                  * Read into buffer
 191                  */
 192                 if (MTD_READ(mtd, off, sizeof(buf), &len, buf) ||
 193                     len != sizeof(buf))
 194                         continue;
 195
 196                 /* found a TRX header */
 197                 if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
 198                         part->offset = le32_to_cpu(trx->offsets[1]);
 199                         part->size = le32_to_cpu(trx->len);
 200
 201                         part->size -= part->offset;
 202                         part->offset += off;
 203
 204                         goto done;
 205                 }
 206         }
 207
 208         printk(KERN_NOTICE
 209                "%s: Couldn't find root filesystem\n",
 210                mtd->name);
 211         return -1;
 212
 213  done:
 214                 return part->size;
 215 }
 216
 217 struct mtd_partition * __init
 218 init_mtd_partitions(struct mtd_info *mtd, size_t size)
 219 {
 220
 221         /* boot loader */
 222         bcm947xx_parts[0].offset=0;
 223         bcm947xx_parts[0].size=256*1024;
 224
 225         /* nvram */
 226         bcm947xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 227         bcm947xx_parts[3].size   = size - bcm947xx_parts[3].offset;
 228
 229         /* Size linux (kernel and rootfs) */
 230         bcm947xx_parts[1].offset = bcm947xx_parts[0].size;
 231         bcm947xx_parts[1].size   = bcm947xx_parts[3].offset - bcm947xx_parts[1].offset;
 232
 233         /* Find and size rootfs */
 234         if (find_root(mtd,size,&bcm947xx_parts[2])==0) {
 235                 /* entirely jffs2 */
 236                 bcm947xx_parts[2].size = bcm947xx_parts[3].offset - bcm947xx_parts[2].offset;
 237                 bcm947xx_parts[4].name = NULL;
 238         } else {
 239                 /* legacy setup */
 240                 /* calculate leftover flash, and assign it to the jffs2 partition */
 241                 bcm947xx_parts[4].offset = bcm947xx_parts[2].offset + bcm947xx_parts[2].size;
 242                 bcm947xx_parts[4].offset = ROUNDUP(bcm947xx_parts[4].offset, mtd->erasesize);
 243                 bcm947xx_parts[4].size = bcm947xx_parts[3].offset - bcm947xx_parts[4].offset;
 244         }
 245
 246         return bcm947xx_parts;
 247 }
 248
 249 EXPORT_SYMBOL(init_mtd_partitions);
 250
 251 #endif