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/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 pq2_find_bridges(void);
  37 extern void pq2pci_init_irq(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         pq2_find_bridges();
  60 #endif
  61 #ifdef CONFIG_BLK_DEV_INITRD
  62         if (initrd_start)
  63                 ROOT_DEV = Root_RAM0;
  64 #endif
  65
  66         identify_ppc_sys_by_name_and_id(BOARD_CHIP_NAME,
  67                                 in_be32(CPM_MAP_ADDR + CPM_IMMR_OFFSET));
  68
  69         m82xx_board_setup();
  70 }
  71
  72 /* The decrementer counts at the system (internal) clock frequency
  73  * divided by four.
  74  */
  75 static void __init
  76 m8260_calibrate_decr(void)
  77 {
  78         bd_t *binfo = (bd_t *)__res;
  79         int freq, divisor;
  80
  81         freq = binfo->bi_busfreq;
  82         divisor = 4;
  83         tb_ticks_per_jiffy = freq / HZ / divisor;
  84         tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
  85 }
  86
  87 /* The 8260 has an internal 1-second timer update register that
  88  * we should use for this purpose.
  89  */
  90 static uint rtc_time;
  91
  92 static int
  93 m8260_set_rtc_time(unsigned long time)
  94 {
  95         rtc_time = time;
  96
  97         return(0);
  98 }
  99
 100 static unsigned long
 101 m8260_get_rtc_time(void)
 102 {
 103         /* Get time from the RTC.
 104         */
 105         return((unsigned long)rtc_time);
 106 }
 107
 108 #ifndef BOOTROM_RESTART_ADDR
 109 #warning "Using default BOOTROM_RESTART_ADDR!"
 110 #define BOOTROM_RESTART_ADDR    0xff000104
 111 #endif
 112
 113 static void
 114 m8260_restart(char *cmd)
 115 {
 116         extern void m8260_gorom(bd_t *bi, uint addr);
 117         uint    startaddr;
 118
 119         /* Most boot roms have a warmstart as the second instruction
 120          * of the reset vector.  If that doesn't work for you, change this
 121          * or the reboot program to send a proper address.
 122          */
 123         startaddr = BOOTROM_RESTART_ADDR;
 124         if (cmd != NULL) {
 125                 if (!strncmp(cmd, "startaddr=", 10))
 126                         startaddr = simple_strtoul(&cmd[10], NULL, 0);
 127         }
 128
 129         m8260_gorom((void*)__pa(__res), startaddr);
 130 }
 131
 132 static void
 133 m8260_halt(void)
 134 {
 135         local_irq_disable();
 136         while (1);
 137 }
 138
 139 static void
 140 m8260_power_off(void)
 141 {
 142         m8260_halt();
 143 }
 144
 145 static int
 146 m8260_show_cpuinfo(struct seq_file *m)
 147 {
 148         bd_t *bp = (bd_t *)__res;
 149
 150         seq_printf(m, "vendor\t\t: %s\n"
 151                    "machine\t\t: %s\n"
 152                    "\n"
 153                    "mem size\t\t: 0x%08x\n"
 154                    "console baud\t\t: %d\n"
 155                    "\n"
 156                    "core clock\t: %u MHz\n"
 157                    "CPM  clock\t: %u MHz\n"
 158                    "bus  clock\t: %u MHz\n",
 159                    CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize,
 160                    bp->bi_baudrate, bp->bi_intfreq / 1000000,
 161                    bp->bi_cpmfreq / 1000000, bp->bi_busfreq / 1000000);
 162         return 0;
 163 }
 164
 165 /* Initialize the internal interrupt controller.  The number of
 166  * interrupts supported can vary with the processor type, and the
 167  * 8260 family can have up to 64.
 168  * External interrupts can be either edge or level triggered, and
 169  * need to be initialized by the appropriate driver.
 170  */
 171 static void __init
 172 m8260_init_IRQ(void)
 173 {
 174         cpm2_init_IRQ();
 175
 176         /* Initialize the default interrupt mapping priorities,
 177          * in case the boot rom changed something on us.
 178          */
 179         cpm2_immr->im_intctl.ic_siprr = 0x05309770;
 180
 181 #if defined(CONFIG_PCI) && (defined(CONFIG_ADS8272) || defined(CONFIG_PQ2FADS))
 182         /* Initialize stuff for the 82xx CPLD IC and install demux  */
 183         pq2pci_init_irq();
 184 #endif
 185
 186 }
 187
 188 /*
 189  * Same hack as 8xx
 190  */
 191 static unsigned long __init
 192 m8260_find_end_of_memory(void)
 193 {
 194         bd_t *binfo = (bd_t *)__res;
 195
 196         return binfo->bi_memsize;
 197 }
 198
 199 /* Map the IMMR, plus anything else we can cover
 200  * in that upper space according to the memory controller
 201  * chip select mapping.  Grab another bunch of space
 202  * below that for stuff we can't cover in the upper.
 203  */
 204 static void __init
 205 m8260_map_io(void)
 206 {
 207         uint addr;
 208
 209         /* Map IMMR region to a 256MB BAT */
 210         addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
 211         io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
 212
 213         /* Map I/O region to a 256MB BAT */
 214         io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
 215 }
 216
 217 /* Place-holder for board-specific ppc_md hooking */
 218 void __attribute__ ((weak)) __init
 219 m82xx_board_init(void)
 220 {
 221 }
 222
 223 /* Inputs:
 224  *   r3 - Optional pointer to a board information structure.
 225  *   r4 - Optional pointer to the physical starting address of the init RAM
 226  *        disk.
 227  *   r5 - Optional pointer to the physical ending address of the init RAM
 228  *        disk.
 229  *   r6 - Optional pointer to the physical starting address of any kernel
 230  *        command-line parameters.
 231  *   r7 - Optional pointer to the physical ending address of any kernel
 232  *        command-line parameters.
 233  */
 234 void __init
 235 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 236               unsigned long r6, unsigned long r7)
 237 {
 238         parse_bootinfo(find_bootinfo());
 239
 240         if ( r3 )
 241                 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
 242
 243 #ifdef CONFIG_BLK_DEV_INITRD
 244         /* take care of initrd if we have one */
 245         if ( r4 ) {
 246                 initrd_start = r4 + KERNELBASE;
 247                 initrd_end = r5 + KERNELBASE;
 248         }
 249 #endif /* CONFIG_BLK_DEV_INITRD */
 250         /* take care of cmd line */
 251         if ( r6 ) {
 252                 *(char *)(r7+KERNELBASE) = 0;
 253                 strcpy(cmd_line, (char *)(r6+KERNELBASE));
 254         }
 255
 256         ppc_md.setup_arch               = m8260_setup_arch;
 257         ppc_md.show_cpuinfo             = m8260_show_cpuinfo;
 258         ppc_md.init_IRQ                 = m8260_init_IRQ;
 259         ppc_md.get_irq                  = cpm2_get_irq;
 260
 261         ppc_md.restart                  = m8260_restart;
 262         ppc_md.power_off                = m8260_power_off;
 263         ppc_md.halt                     = m8260_halt;
 264
 265         ppc_md.set_rtc_time             = m8260_set_rtc_time;
 266         ppc_md.get_rtc_time             = m8260_get_rtc_time;
 267         ppc_md.calibrate_decr           = m8260_calibrate_decr;
 268
 269         ppc_md.find_end_of_memory       = m8260_find_end_of_memory;
 270         ppc_md.setup_io_mappings        = m8260_map_io;
 271
 272         /* Call back for board-specific settings and overrides. */
 273         m82xx_board_init();
 274 }