target/linux/rb532/files/arch/mips/rb500/prom.c

   1 /*
   2 * prom.c
   3 **********************************************************************
   4 * P . Sadik Oct 10, 2003
   5 *
   6 * Started change log
   7 * idt_cpu_freq is make a kernel configuration parameter
   8 * idt_cpu_freq is exported so that other modules can use it.
   9 * Code cleanup
  10 **********************************************************************
  11 * P. Sadik Oct 20, 2003
  12 *
  13 * Removed NVRAM code from here, since they are already available under
  14 * nvram directory.
  15 * Added serial port initialisation.
  16 **********************************************************************
  17 **********************************************************************
  18 * P. Sadik Oct 30, 2003
  19 *
  20 * Added reset_cons_port
  21 **********************************************************************
  22
  23   P.Christeas, 2005-2006
  24   Port to 2.6, add 2.6 cmdline parsing
  25
  26 */
  27
  28 #include <linux/autoconf.h>
  29 #include <linux/init.h>
  30 #include <linux/mm.h>
  31 #include <linux/module.h>
  32 #include <linux/string.h>
  33 #include <linux/console.h>
  34 #include <asm/bootinfo.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/ioport.h>
  37 #include <linux/blkdev.h>
  38 #include <asm/rc32434/ddr.h>
  39
  40 #define PROM_ENTRY(x)   (0xbfc00000+((x)*8))
  41 extern void __init setup_serial_port(void);
  42
  43 unsigned int idt_cpu_freq = 132000000;
  44 EXPORT_SYMBOL(idt_cpu_freq);
  45 unsigned int gpio_bootup_state = 0;
  46 EXPORT_SYMBOL(gpio_bootup_state);
  47
  48 char mips_mac_address[18] = "08:00:06:05:40:01";
  49 EXPORT_SYMBOL(mips_mac_address);
  50
  51 /* what to append to cmdline when button is [not] pressed */
  52 #define GPIO_INIT_NOBUTTON ""
  53 #define GPIO_INIT_BUTTON   " 2"
  54
  55 #ifdef CONFIG_MIKROTIK_RB500
  56 unsigned soft_reboot = 0;
  57 EXPORT_SYMBOL(soft_reboot);
  58 #endif
  59
  60 #define SR_NMI                  0x00180000      /* NMI */
  61 #define SERIAL_SPEED_ENTRY      0x00000001
  62
  63 #ifdef CONFIG_REMOTE_DEBUG
  64 extern int remote_debug;
  65 #endif
  66
  67 #define FREQ_TAG   "HZ="
  68 #define GPIO_TAG   "gpio="
  69 #define KMAC_TAG   "kmac="
  70 #define MEM_TAG    "mem="
  71 #define BOARD_TAG  "board="
  72 #define IGNORE_CMDLINE_MEM 1
  73 #define DEBUG_DDR
  74
  75 #define BOARD_RB532     "500"
  76 #define BOARD_RB532A    "500r5"
  77
  78 void parse_soft_settings(unsigned *ptr, unsigned size);
  79 void parse_hard_settings(unsigned *ptr, unsigned size);
  80
  81 void __init prom_setup_cmdline(void);
  82
  83 void __init prom_init(void)
  84 {
  85         DDR_t ddr = (DDR_t) DDR_VirtualAddress; /* define the pointer to the DDR registers */
  86         phys_t memsize = 0-ddr->ddrmask;
  87
  88         /* this should be the very first message, even before serial is properly initialized */
  89         prom_setup_cmdline();
  90         setup_serial_port();
  91
  92         mips_machgroup = MACH_GROUP_MIKROTIK;
  93         soft_reboot = read_c0_status() & SR_NMI;
  94         pm_power_off = NULL;
  95
  96         /*
  97          * give all RAM to boot allocator,
  98          * except for the first 0x400 and the last 0x200 bytes
  99          */
 100         add_memory_region(ddr->ddrbase + 0x400, memsize - 0x600, BOOT_MEM_RAM);
 101 }
 102
 103 void __init prom_free_prom_memory(void)
 104 {
 105         /* No prom memory to free */
 106 }
 107
 108 static inline int match_tag(char *arg, const char *tag)
 109 {
 110         return (strncmp(arg, tag, strlen(tag)) == 0);
 111 }
 112
 113 static inline unsigned long tag2ul(char *arg, const char *tag)
 114 {
 115         char *num = arg+strlen(tag);
 116         return simple_strtoul(num, 0, 10);
 117 }
 118
 119 extern char _image_cmdline;
 120 void __init prom_setup_cmdline(void){
 121         char cmd_line[CL_SIZE];
 122         char *cp;
 123         int prom_argc;
 124         char **prom_argv, **prom_envp;
 125         int i;
 126
 127         prom_argc = fw_arg0;
 128         prom_argv = (char **) fw_arg1;
 129         prom_envp = (char **) fw_arg2;
 130
 131         cp=cmd_line;
 132                 /* Note: it is common that parameters start at argv[1] and not argv[0],
 133                 however, our elf loader starts at [0] */
 134         for(i=0;i<prom_argc;i++){
 135                 if (match_tag(prom_argv[i], FREQ_TAG)) {
 136                         idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG);
 137                         continue;
 138                 }
 139 #ifdef IGNORE_CMDLINE_MEM
 140                 /* parses out the "mem=xx" arg */
 141                 if (match_tag(prom_argv[i], MEM_TAG)) {
 142                         continue;
 143                 }
 144 #endif
 145                 if (i>0) *(cp++) = ' ';
 146                 if (match_tag(prom_argv[i], BOARD_TAG)) {
 147                         char *board = prom_argv[i] + strlen(BOARD_TAG);
 148                         if (match_tag(board, BOARD_RB532A))
 149                                 mips_machtype = MACH_MIKROTIK_RB532A;
 150                         else
 151                                 mips_machtype = MACH_MIKROTIK_RB532;
 152                 }
 153
 154                 if (match_tag(prom_argv[i], GPIO_TAG)) {
 155                         gpio_bootup_state = tag2ul(prom_argv[i], GPIO_TAG);
 156                 }
 157                 strcpy(cp,prom_argv[i]);
 158                 cp+=strlen(prom_argv[i]);
 159         }
 160         *(cp++) = ' ';
 161         strcpy(cp,(&_image_cmdline + 8));
 162         cp += strlen(&_image_cmdline);
 163
 164         i=strlen(arcs_cmdline);
 165         if (i>0){
 166                 *(cp++) = ' ';
 167                 strcpy(cp,arcs_cmdline);
 168                 cp+=strlen(arcs_cmdline);
 169         }
 170         if (gpio_bootup_state&0x02)
 171                 strcpy(cp,GPIO_INIT_NOBUTTON);
 172         else
 173                 strcpy(cp,GPIO_INIT_BUTTON);
 174         cmd_line[CL_SIZE-1] = '\0';
 175
 176         strcpy(arcs_cmdline,cmd_line);
 177 }
 178