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/config.h>
  10 #include <linux/sched.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mm.h>
  13 #include <linux/stddef.h>
  14 #include <linux/slab.h>
  15 #include <linux/init.h>
  16 #include <linux/initrd.h>
  17 #include <linux/root_dev.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/irq.h>
  20
  21 #include <asm/mmu.h>
  22 #include <asm/io.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/mpc8260.h>
  25 #include <asm/cpm2.h>
  26 #include <asm/machdep.h>
  27 #include <asm/bootinfo.h>
  28 #include <asm/time.h>
  29
  30 #include "cpm2_pic.h"
  31
  32 unsigned char __res[sizeof(bd_t)];
  33
  34 extern void pq2_find_bridges(void);
  35 extern void pq2pci_init_irq(void);
  36 extern void idma_pci9_init(void);
  37
  38 /* Place-holder for board-specific init */
  39 void __attribute__ ((weak)) __init
  40 m82xx_board_setup(void)
  41 {
  42 }
  43
  44 static void __init
  45 m8260_setup_arch(void)
  46 {
  47         /* Print out Vendor and Machine info. */
  48         printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE);
  49
  50         /* Reset the Communication Processor Module. */
  51         cpm2_reset();
  52 #ifdef CONFIG_8260_PCI9
  53         /* Initialise IDMA for PCI erratum workaround */
  54         idma_pci9_init();
  55 #endif
  56 #ifdef CONFIG_PCI_8260
  57         pq2_find_bridges();
  58 #endif
  59 #ifdef CONFIG_BLK_DEV_INITRD
  60         if (initrd_start)
  61                 ROOT_DEV = Root_RAM0;
  62 #endif
  63
  64         identify_ppc_sys_by_name_and_id(BOARD_CHIP_NAME,
  65                                 in_be32(CPM_MAP_ADDR + CPM_IMMR_OFFSET));
  66
  67         m82xx_board_setup();
  68 }
  69
  70 /* The decrementer counts at the system (internal) clock frequency
  71  * divided by four.
  72  */
  73 static void __init
  74 m8260_calibrate_decr(void)
  75 {
  76         bd_t *binfo = (bd_t *)__res;
  77         int freq, divisor;
  78
  79         freq = binfo->bi_busfreq;
  80         divisor = 4;
  81         tb_ticks_per_jiffy = freq / HZ / divisor;
  82         tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
  83 }
  84
  85 /* The 8260 has an internal 1-second timer update register that
  86  * we should use for this purpose.
  87  */
  88 static uint rtc_time;
  89
  90 static int
  91 m8260_set_rtc_time(unsigned long time)
  92 {
  93         rtc_time = time;
  94
  95         return(0);
  96 }
  97
  98 static unsigned long
  99 m8260_get_rtc_time(void)
 100 {
 101         /* Get time from the RTC.
 102         */
 103         return((unsigned long)rtc_time);
 104 }
 105
 106 #ifndef BOOTROM_RESTART_ADDR
 107 #warning "Using default BOOTROM_RESTART_ADDR!"
 108 #define BOOTROM_RESTART_ADDR    0xff000104
 109 #endif
 110
 111 static void
 112 m8260_restart(char *cmd)
 113 {
 114         extern void m8260_gorom(bd_t *bi, uint addr);
 115         uint    startaddr;
 116
 117         /* Most boot roms have a warmstart as the second instruction
 118          * of the reset vector.  If that doesn't work for you, change this
 119          * or the reboot program to send a proper address.
 120          */
 121         startaddr = BOOTROM_RESTART_ADDR;
 122         if (cmd != NULL) {
 123                 if (!strncmp(cmd, "startaddr=", 10))
 124                         startaddr = simple_strtoul(&cmd[10], NULL, 0);
 125         }
 126
 127         m8260_gorom((void*)__pa(__res), startaddr);
 128 }
 129
 130 static void
 131 m8260_halt(void)
 132 {
 133         local_irq_disable();
 134         while (1);
 135 }
 136
 137 static void
 138 m8260_power_off(void)
 139 {
 140         m8260_halt();
 141 }
 142
 143 static int
 144 m8260_show_cpuinfo(struct seq_file *m)
 145 {
 146         bd_t *bp = (bd_t *)__res;
 147
 148         seq_printf(m, "vendor\t\t: %s\n"
 149                    "machine\t\t: %s\n"
 150                    "\n"
 151                    "mem size\t\t: 0x%08x\n"
 152                    "console baud\t\t: %d\n"
 153                    "\n"
 154                    "core clock\t: %u MHz\n"
 155                    "CPM  clock\t: %u MHz\n"
 156                    "bus  clock\t: %u MHz\n",
 157                    CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize,
 158                    bp->bi_baudrate, bp->bi_intfreq / 1000000,
 159                    bp->bi_cpmfreq / 1000000, bp->bi_busfreq / 1000000);
 160         return 0;
 161 }
 162
 163 /* Initialize the internal interrupt controller.  The number of
 164  * interrupts supported can vary with the processor type, and the
 165  * 8260 family can have up to 64.
 166  * External interrupts can be either edge or level triggered, and
 167  * need to be initialized by the appropriate driver.
 168  */
 169 static void __init
 170 m8260_init_IRQ(void)
 171 {
 172         cpm2_init_IRQ();
 173
 174         /* Initialize the default interrupt mapping priorities,
 175          * in case the boot rom changed something on us.
 176          */
 177         cpm2_immr->im_intctl.ic_siprr = 0x05309770;
 178
 179 #if defined(CONFIG_PCI) && (defined(CONFIG_ADS8272) || defined(CONFIG_PQ2FADS))
 180         /* Initialize stuff for the 82xx CPLD IC and install demux  */
 181         pq2pci_init_irq();
 182 #endif
 183
 184 }
 185
 186 /*
 187  * Same hack as 8xx
 188  */
 189 static unsigned long __init
 190 m8260_find_end_of_memory(void)
 191 {
 192         bd_t *binfo = (bd_t *)__res;
 193
 194         return binfo->bi_memsize;
 195 }
 196
 197 /* Map the IMMR, plus anything else we can cover
 198  * in that upper space according to the memory controller
 199  * chip select mapping.  Grab another bunch of space
 200  * below that for stuff we can't cover in the upper.
 201  */
 202 static void __init
 203 m8260_map_io(void)
 204 {
 205         uint addr;
 206
 207         /* Map IMMR region to a 256MB BAT */
 208         addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
 209         io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
 210
 211         /* Map I/O region to a 256MB BAT */
 212         io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
 213 }
 214
 215 /* Place-holder for board-specific ppc_md hooking */
 216 void __attribute__ ((weak)) __init
 217 m82xx_board_init(void)
 218 {
 219 }
 220
 221 /* Inputs:
 222  *   r3 - Optional pointer to a board information structure.
 223  *   r4 - Optional pointer to the physical starting address of the init RAM
 224  *        disk.
 225  *   r5 - Optional pointer to the physical ending address of the init RAM
 226  *        disk.
 227  *   r6 - Optional pointer to the physical starting address of any kernel
 228  *        command-line parameters.
 229  *   r7 - Optional pointer to the physical ending address of any kernel
 230  *        command-line parameters.
 231  */
 232 void __init
 233 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 234               unsigned long r6, unsigned long r7)
 235 {
 236         parse_bootinfo(find_bootinfo());
 237
 238         if ( r3 )
 239                 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
 240
 241 #ifdef CONFIG_BLK_DEV_INITRD
 242         /* take care of initrd if we have one */
 243         if ( r4 ) {
 244                 initrd_start = r4 + KERNELBASE;
 245                 initrd_end = r5 + KERNELBASE;
 246         }
 247 #endif /* CONFIG_BLK_DEV_INITRD */
 248         /* take care of cmd line */
 249         if ( r6 ) {
 250                 *(char *)(r7+KERNELBASE) = 0;
 251                 strcpy(cmd_line, (char *)(r6+KERNELBASE));
 252         }
 253
 254         ppc_md.setup_arch               = m8260_setup_arch;
 255         ppc_md.show_cpuinfo             = m8260_show_cpuinfo;
 256         ppc_md.init_IRQ                 = m8260_init_IRQ;
 257         ppc_md.get_irq                  = cpm2_get_irq;
 258
 259         ppc_md.restart                  = m8260_restart;
 260         ppc_md.power_off                = m8260_power_off;
 261         ppc_md.halt                     = m8260_halt;
 262
 263         ppc_md.set_rtc_time             = m8260_set_rtc_time;
 264         ppc_md.get_rtc_time             = m8260_get_rtc_time;
 265         ppc_md.calibrate_decr           = m8260_calibrate_decr;
 266
 267         ppc_md.find_end_of_memory       = m8260_find_end_of_memory;
 268         ppc_md.setup_io_mappings        = m8260_map_io;
 269
 270         /* Call back for board-specific settings and overrides. */
 271         m82xx_board_init();
 272 }