release/src-rt-6.x/linux/linux-2.6/arch/ppc/syslib/m8260_setup.c

   1 /*
   2  *  Copyright (C) 1995  Linus Torvalds
   3  *  Adapted from 'alpha' version by Gary Thomas
   4  *  Modified by Cort Dougan (cort@cs.nmt.edu)
   5  *  Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net)
   6  *  Further modified for generic 8xx and 8260 by Dan.
   7  */
   8
   9 #include <linux/sched.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mm.h>
  12 #include <linux/stddef.h>
  13 #include <linux/slab.h>
  14 #include <linux/init.h>
  15 #include <linux/initrd.h>
  16 #include <linux/root_dev.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/irq.h>
  19
  20 #include <asm/mmu.h>
  21 #include <asm/io.h>
  22 #include <asm/pgtable.h>
  23 #include <asm/mpc8260.h>
  24 #include <asm/cpm2.h>
  25 #include <asm/machdep.h>
  26 #include <asm/bootinfo.h>
  27 #include <asm/time.h>
  28
  29 #include "cpm2_pic.h"
  30
  31 unsigned char __res[sizeof(bd_t)];
  32
  33 extern void pq2_find_bridges(void);
  34 extern void pq2pci_init_irq(void);
  35 extern void idma_pci9_init(void);
  36
  37 /* Place-holder for board-specific init */
  38 void __attribute__ ((weak)) __init
  39 m82xx_board_setup(void)
  40 {
  41 }
  42
  43 static void __init
  44 m8260_setup_arch(void)
  45 {
  46         /* Print out Vendor and Machine info. */
  47         printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE);
  48
  49         /* Reset the Communication Processor Module. */
  50         cpm2_reset();
  51 #ifdef CONFIG_8260_PCI9
  52         /* Initialise IDMA for PCI erratum workaround */
  53         idma_pci9_init();
  54 #endif
  55 #ifdef CONFIG_PCI_8260
  56         pq2_find_bridges();
  57 #endif
  58 #ifdef CONFIG_BLK_DEV_INITRD
  59         if (initrd_start)
  60                 ROOT_DEV = Root_RAM0;
  61 #endif
  62
  63         identify_ppc_sys_by_name_and_id(BOARD_CHIP_NAME,
  64                                 in_be32(CPM_MAP_ADDR + CPM_IMMR_OFFSET));
  65
  66         m82xx_board_setup();
  67 }
  68
  69 /* The decrementer counts at the system (internal) clock frequency
  70  * divided by four.
  71  */
  72 static void __init
  73 m8260_calibrate_decr(void)
  74 {
  75         bd_t *binfo = (bd_t *)__res;
  76         int freq, divisor;
  77
  78         freq = binfo->bi_busfreq;
  79         divisor = 4;
  80         tb_ticks_per_jiffy = freq / HZ / divisor;
  81         tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
  82 }
  83
  84 /* The 8260 has an internal 1-second timer update register that
  85  * we should use for this purpose.
  86  */
  87 static uint rtc_time;
  88
  89 static int
  90 m8260_set_rtc_time(unsigned long time)
  91 {
  92         rtc_time = time;
  93
  94         return(0);
  95 }
  96
  97 static unsigned long
  98 m8260_get_rtc_time(void)
  99 {
 100         /* Get time from the RTC.
 101         */
 102         return((unsigned long)rtc_time);
 103 }
 104
 105 #ifndef BOOTROM_RESTART_ADDR
 106 #warning "Using default BOOTROM_RESTART_ADDR!"
 107 #define BOOTROM_RESTART_ADDR    0xff000104
 108 #endif
 109
 110 static void
 111 m8260_restart(char *cmd)
 112 {
 113         extern void m8260_gorom(bd_t *bi, uint addr);
 114         uint    startaddr;
 115
 116         /* Most boot roms have a warmstart as the second instruction
 117          * of the reset vector.  If that doesn't work for you, change this
 118          * or the reboot program to send a proper address.
 119          */
 120         startaddr = BOOTROM_RESTART_ADDR;
 121         if (cmd != NULL) {
 122                 if (!strncmp(cmd, "startaddr=", 10))
 123                         startaddr = simple_strtoul(&cmd[10], NULL, 0);
 124         }
 125
 126         m8260_gorom((void*)__pa(__res), startaddr);
 127 }
 128
 129 static void
 130 m8260_halt(void)
 131 {
 132         local_irq_disable();
 133         while (1);
 134 }
 135
 136 static void
 137 m8260_power_off(void)
 138 {
 139         m8260_halt();
 140 }
 141
 142 static int
 143 m8260_show_cpuinfo(struct seq_file *m)
 144 {
 145         bd_t *bp = (bd_t *)__res;
 146
 147         seq_printf(m, "vendor\t\t: %s\n"
 148                    "machine\t\t: %s\n"
 149                    "\n"
 150                    "mem size\t\t: 0x%08x\n"
 151                    "console baud\t\t: %d\n"
 152                    "\n"
 153                    "core clock\t: %u MHz\n"
 154                    "CPM  clock\t: %u MHz\n"
 155                    "bus  clock\t: %u MHz\n",
 156                    CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize,
 157                    bp->bi_baudrate, bp->bi_intfreq / 1000000,
 158                    bp->bi_cpmfreq / 1000000, bp->bi_busfreq / 1000000);
 159         return 0;
 160 }
 161
 162 /* Initialize the internal interrupt controller.  The number of
 163  * interrupts supported can vary with the processor type, and the
 164  * 8260 family can have up to 64.
 165  * External interrupts can be either edge or level triggered, and
 166  * need to be initialized by the appropriate driver.
 167  */
 168 static void __init
 169 m8260_init_IRQ(void)
 170 {
 171         cpm2_init_IRQ();
 172
 173         /* Initialize the default interrupt mapping priorities,
 174          * in case the boot rom changed something on us.
 175          */
 176         cpm2_immr->im_intctl.ic_siprr = 0x05309770;
 177
 178 #if defined(CONFIG_PCI) && (defined(CONFIG_ADS8272) || defined(CONFIG_PQ2FADS))
 179         /* Initialize stuff for the 82xx CPLD IC and install demux  */
 180         pq2pci_init_irq();
 181 #endif
 182
 183 }
 184
 185 /*
 186  * Same hack as 8xx
 187  */
 188 static unsigned long __init
 189 m8260_find_end_of_memory(void)
 190 {
 191         bd_t *binfo = (bd_t *)__res;
 192
 193         return binfo->bi_memsize;
 194 }
 195
 196 /* Map the IMMR, plus anything else we can cover
 197  * in that upper space according to the memory controller
 198  * chip select mapping.  Grab another bunch of space
 199  * below that for stuff we can't cover in the upper.
 200  */
 201 static void __init
 202 m8260_map_io(void)
 203 {
 204         uint addr;
 205
 206         /* Map IMMR region to a 256MB BAT */
 207         addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
 208         io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
 209
 210         /* Map I/O region to a 256MB BAT */
 211         io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
 212 }
 213
 214 /* Place-holder for board-specific ppc_md hooking */
 215 void __attribute__ ((weak)) __init
 216 m82xx_board_init(void)
 217 {
 218 }
 219
 220 /* Inputs:
 221  *   r3 - Optional pointer to a board information structure.
 222  *   r4 - Optional pointer to the physical starting address of the init RAM
 223  *        disk.
 224  *   r5 - Optional pointer to the physical ending address of the init RAM
 225  *        disk.
 226  *   r6 - Optional pointer to the physical starting address of any kernel
 227  *        command-line parameters.
 228  *   r7 - Optional pointer to the physical ending address of any kernel
 229  *        command-line parameters.
 230  */
 231 void __init
 232 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 233               unsigned long r6, unsigned long r7)
 234 {
 235         parse_bootinfo(find_bootinfo());
 236
 237         if ( r3 )
 238                 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
 239
 240 #ifdef CONFIG_BLK_DEV_INITRD
 241         /* take care of initrd if we have one */
 242         if ( r4 ) {
 243                 initrd_start = r4 + KERNELBASE;
 244                 initrd_end = r5 + KERNELBASE;
 245         }
 246 #endif /* CONFIG_BLK_DEV_INITRD */
 247         /* take care of cmd line */
 248         if ( r6 ) {
 249                 *(char *)(r7+KERNELBASE) = 0;
 250                 strcpy(cmd_line, (char *)(r6+KERNELBASE));
 251         }
 252
 253         ppc_md.setup_arch               = m8260_setup_arch;
 254         ppc_md.show_cpuinfo             = m8260_show_cpuinfo;
 255         ppc_md.init_IRQ                 = m8260_init_IRQ;
 256         ppc_md.get_irq                  = cpm2_get_irq;
 257
 258         ppc_md.restart                  = m8260_restart;
 259         ppc_md.power_off                = m8260_power_off;
 260         ppc_md.halt                     = m8260_halt;
 261
 262         ppc_md.set_rtc_time             = m8260_set_rtc_time;
 263         ppc_md.get_rtc_time             = m8260_get_rtc_time;
 264         ppc_md.calibrate_decr           = m8260_calibrate_decr;
 265
 266         ppc_md.find_end_of_memory       = m8260_find_end_of_memory;
 267         ppc_md.setup_io_mappings        = m8260_map_io;
 268
 269         /* Call back for board-specific settings and overrides. */
 270         m82xx_board_init();
 271 }