arch/ppc/syslib/m8260_setup.c

   1 /*
   2  *  arch/ppc/syslib/m8260_setup.c
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Adapted from 'alpha' version by Gary Thomas
   6  *  Modified by Cort Dougan (cort@cs.nmt.edu)
   7  *  Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net)
   8  *  Further modified for generic 8xx and 8260 by Dan.
   9  */
  10
  11 #include <linux/config.h>
  12 #include <linux/sched.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mm.h>
  15 #include <linux/stddef.h>
  16 #include <linux/slab.h>
  17 #include <linux/init.h>
  18 #include <linux/initrd.h>
  19 #include <linux/root_dev.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/irq.h>
  22
  23 #include <asm/mmu.h>
  24 #include <asm/io.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/mpc8260.h>
  27 #include <asm/immap_cpm2.h>
  28 #include <asm/machdep.h>
  29 #include <asm/bootinfo.h>
  30 #include <asm/time.h>
  31
  32 #include "cpm2_pic.h"
  33
  34 unsigned char __res[sizeof(bd_t)];
  35
  36 extern void cpm2_reset(void);
  37 extern void m8260_find_bridges(void);
  38 extern void idma_pci9_init(void);
  39
  40 /* Place-holder for board-specific init */
  41 void __attribute__ ((weak)) __init
  42 m82xx_board_setup(void)
  43 {
  44 }
  45
  46 static void __init
  47 m8260_setup_arch(void)
  48 {
  49         /* Print out Vendor and Machine info. */
  50         printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE);
  51
  52         /* Reset the Communication Processor Module. */
  53         cpm2_reset();
  54 #ifdef CONFIG_8260_PCI9
  55         /* Initialise IDMA for PCI erratum workaround */
  56         idma_pci9_init();
  57 #endif
  58 #ifdef CONFIG_PCI_8260
  59         m8260_find_bridges();
  60 #endif
  61 #ifdef CONFIG_BLK_DEV_INITRD
  62         if (initrd_start)
  63                 ROOT_DEV = Root_RAM0;
  64 #endif
  65         m82xx_board_setup();
  66 }
  67
  68 /* The decrementer counts at the system (internal) clock frequency
  69  * divided by four.
  70  */
  71 static void __init
  72 m8260_calibrate_decr(void)
  73 {
  74         bd_t *binfo = (bd_t *)__res;
  75         int freq, divisor;
  76
  77         freq = binfo->bi_busfreq;
  78         divisor = 4;
  79         tb_ticks_per_jiffy = freq / HZ / divisor;
  80         tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
  81 }
  82
  83 /* The 8260 has an internal 1-second timer update register that
  84  * we should use for this purpose.
  85  */
  86 static uint rtc_time;
  87
  88 static int
  89 m8260_set_rtc_time(unsigned long time)
  90 {
  91         rtc_time = time;
  92
  93         return(0);
  94 }
  95
  96 static unsigned long
  97 m8260_get_rtc_time(void)
  98 {
  99         /* Get time from the RTC.
 100         */
 101         return((unsigned long)rtc_time);
 102 }
 103
 104 #ifndef BOOTROM_RESTART_ADDR
 105 #warning "Using default BOOTROM_RESTART_ADDR!"
 106 #define BOOTROM_RESTART_ADDR    0xff000104
 107 #endif
 108
 109 static void
 110 m8260_restart(char *cmd)
 111 {
 112         extern void m8260_gorom(bd_t *bi, uint addr);
 113         uint    startaddr;
 114
 115         /* Most boot roms have a warmstart as the second instruction
 116          * of the reset vector.  If that doesn't work for you, change this
 117          * or the reboot program to send a proper address.
 118          */
 119         startaddr = BOOTROM_RESTART_ADDR;
 120         if (cmd != NULL) {
 121                 if (!strncmp(cmd, "startaddr=", 10))
 122                         startaddr = simple_strtoul(&cmd[10], NULL, 0);
 123         }
 124
 125         m8260_gorom((void*)__pa(__res), startaddr);
 126 }
 127
 128 static void
 129 m8260_halt(void)
 130 {
 131         local_irq_disable();
 132         while (1);
 133 }
 134
 135 static void
 136 m8260_power_off(void)
 137 {
 138         m8260_halt();
 139 }
 140
 141 static int
 142 m8260_show_cpuinfo(struct seq_file *m)
 143 {
 144         bd_t *bp = (bd_t *)__res;
 145
 146         seq_printf(m, "vendor\t\t: %s\n"
 147                    "machine\t\t: %s\n"
 148                    "\n"
 149                    "mem size\t\t: 0x%08x\n"
 150                    "console baud\t\t: %d\n"
 151                    "\n"
 152                    "core clock\t: %u MHz\n"
 153                    "CPM  clock\t: %u MHz\n"
 154                    "bus  clock\t: %u MHz\n",
 155                    CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize,
 156                    bp->bi_baudrate, bp->bi_intfreq / 1000000,
 157                    bp->bi_cpmfreq / 1000000, bp->bi_busfreq / 1000000);
 158         return 0;
 159 }
 160
 161 /* Initialize the internal interrupt controller.  The number of
 162  * interrupts supported can vary with the processor type, and the
 163  * 8260 family can have up to 64.
 164  * External interrupts can be either edge or level triggered, and
 165  * need to be initialized by the appropriate driver.
 166  */
 167 static void __init
 168 m8260_init_IRQ(void)
 169 {
 170         cpm2_init_IRQ();
 171
 172         /* Initialize the default interrupt mapping priorities,
 173          * in case the boot rom changed something on us.
 174          */
 175         cpm2_immr->im_intctl.ic_siprr = 0x05309770;
 176 }
 177
 178 /*
 179  * Same hack as 8xx
 180  */
 181 static unsigned long __init
 182 m8260_find_end_of_memory(void)
 183 {
 184         bd_t *binfo = (bd_t *)__res;
 185
 186         return binfo->bi_memsize;
 187 }
 188
 189 /* Map the IMMR, plus anything else we can cover
 190  * in that upper space according to the memory controller
 191  * chip select mapping.  Grab another bunch of space
 192  * below that for stuff we can't cover in the upper.
 193  */
 194 static void __init
 195 m8260_map_io(void)
 196 {
 197         uint addr;
 198
 199         /* Map IMMR region to a 256MB BAT */
 200         addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
 201         io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
 202
 203         /* Map I/O region to a 256MB BAT */
 204         io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
 205 }
 206
 207 /* Place-holder for board-specific ppc_md hooking */
 208 void __attribute__ ((weak)) __init
 209 m82xx_board_init(void)
 210 {
 211 }
 212
 213 /* Inputs:
 214  *   r3 - Optional pointer to a board information structure.
 215  *   r4 - Optional pointer to the physical starting address of the init RAM
 216  *        disk.
 217  *   r5 - Optional pointer to the physical ending address of the init RAM
 218  *        disk.
 219  *   r6 - Optional pointer to the physical starting address of any kernel
 220  *        command-line parameters.
 221  *   r7 - Optional pointer to the physical ending address of any kernel
 222  *        command-line parameters.
 223  */
 224 void __init
 225 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 226               unsigned long r6, unsigned long r7)
 227 {
 228         parse_bootinfo(find_bootinfo());
 229
 230         if ( r3 )
 231                 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
 232
 233 #ifdef CONFIG_BLK_DEV_INITRD
 234         /* take care of initrd if we have one */
 235         if ( r4 ) {
 236                 initrd_start = r4 + KERNELBASE;
 237                 initrd_end = r5 + KERNELBASE;
 238         }
 239 #endif /* CONFIG_BLK_DEV_INITRD */
 240         /* take care of cmd line */
 241         if ( r6 ) {
 242                 *(char *)(r7+KERNELBASE) = 0;
 243                 strcpy(cmd_line, (char *)(r6+KERNELBASE));
 244         }
 245
 246         ppc_md.setup_arch               = m8260_setup_arch;
 247         ppc_md.show_cpuinfo             = m8260_show_cpuinfo;
 248         ppc_md.init_IRQ                 = m8260_init_IRQ;
 249         ppc_md.get_irq                  = cpm2_get_irq;
 250
 251         ppc_md.restart                  = m8260_restart;
 252         ppc_md.power_off                = m8260_power_off;
 253         ppc_md.halt                     = m8260_halt;
 254
 255         ppc_md.set_rtc_time             = m8260_set_rtc_time;
 256         ppc_md.get_rtc_time             = m8260_get_rtc_time;
 257         ppc_md.calibrate_decr           = m8260_calibrate_decr;
 258
 259         ppc_md.find_end_of_memory       = m8260_find_end_of_memory;
 260         ppc_md.setup_io_mappings        = m8260_map_io;
 261
 262         /* Call back for board-specific settings and overrides. */
 263         m82xx_board_init();
 264 }