arch/ppc/syslib/m8xx_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 by Dan.
   7  */
   8
   9 /*
  10  * bootup setup stuff..
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/errno.h>
  15 #include <linux/sched.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/stddef.h>
  19 #include <linux/unistd.h>
  20 #include <linux/ptrace.h>
  21 #include <linux/slab.h>
  22 #include <linux/user.h>
  23 #include <linux/a.out.h>
  24 #include <linux/tty.h>
  25 #include <linux/major.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/reboot.h>
  28 #include <linux/init.h>
  29 #include <linux/initrd.h>
  30 #include <linux/ioport.h>
  31 #include <linux/bootmem.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/root_dev.h>
  34
  35 #if defined(CONFIG_MTD) && defined(CONFIG_MTD_PHYSMAP)
  36 #include <linux/mtd/partitions.h>
  37 #include <linux/mtd/physmap.h>
  38 #include <linux/mtd/mtd.h>
  39 #include <linux/mtd/map.h>
  40 #endif
  41
  42 #include <asm/mmu.h>
  43 #include <asm/reg.h>
  44 #include <asm/residual.h>
  45 #include <asm/io.h>
  46 #include <asm/pgtable.h>
  47 #include <asm/mpc8xx.h>
  48 #include <asm/8xx_immap.h>
  49 #include <asm/machdep.h>
  50 #include <asm/bootinfo.h>
  51 #include <asm/time.h>
  52 #include <asm/xmon.h>
  53 #include <asm/ppc_sys.h>
  54
  55 #include "ppc8xx_pic.h"
  56
  57 #ifdef CONFIG_MTD_PHYSMAP
  58 #define MPC8xxADS_BANK_WIDTH 4
  59 #endif
  60
  61 #define MPC8xxADS_U_BOOT_SIZE          0x80000
  62 #define MPC8xxADS_FREE_AREA_OFFSET     MPC8xxADS_U_BOOT_SIZE
  63
  64 #if defined(CONFIG_MTD_PARTITIONS)
  65  /*
  66    NOTE: bank width and interleave relative to the installed flash
  67    should have been chosen within MTD_CFI_GEOMETRY options.
  68  */
  69 static struct mtd_partition mpc8xxads_partitions[] = {
  70         {
  71                 .name = "bootloader",
  72                 .size = MPC8xxADS_U_BOOT_SIZE,
  73                 .offset = 0,
  74                 .mask_flags   = MTD_WRITEABLE,  /* force read-only */
  75         }, {
  76                 .name = "User FS",
  77                 .offset = MPC8xxADS_FREE_AREA_OFFSET
  78         }
  79 };
  80
  81 #define mpc8xxads_part_num (sizeof (mpc8xxads_partitions) / sizeof (mpc8xxads_partitions[0]))
  82
  83 #endif
  84
  85 static int m8xx_set_rtc_time(unsigned long time);
  86 static unsigned long m8xx_get_rtc_time(void);
  87 void m8xx_calibrate_decr(void);
  88
  89 unsigned char __res[sizeof(bd_t)];
  90
  91 extern void m8xx_ide_init(void);
  92
  93 extern unsigned long find_available_memory(void);
  94 extern void m8xx_cpm_reset(void);
  95 extern void m8xx_wdt_handler_install(bd_t *bp);
  96 extern void rpxfb_alloc_pages(void);
  97 extern void cpm_interrupt_init(void);
  98
  99 void __attribute__ ((weak))
 100 board_init(void)
 101 {
 102 }
 103
 104 void __init
 105 m8xx_setup_arch(void)
 106 {
 107 #if defined(CONFIG_MTD) && defined(CONFIG_MTD_PHYSMAP)
 108         bd_t *binfo = (bd_t *)__res;
 109 #endif
 110
 111         /* Reset the Communication Processor Module.
 112         */
 113         m8xx_cpm_reset();
 114
 115 #ifdef CONFIG_FB_RPX
 116         rpxfb_alloc_pages();
 117 #endif
 118
 119 #ifdef notdef
 120         ROOT_DEV = Root_HDA1; /* hda1 */
 121 #endif
 122
 123 #ifdef CONFIG_BLK_DEV_INITRD
 124 #if 0
 125         ROOT_DEV = Root_FD0; /* floppy */
 126         rd_prompt = 1;
 127         rd_doload = 1;
 128         rd_image_start = 0;
 129 #endif
 130 #if 0   /* XXX this may need to be updated for the new bootmem stuff,
 131            or possibly just deleted (see set_phys_avail() in init.c).
 132            - paulus. */
 133         /* initrd_start and size are setup by boot/head.S and kernel/head.S */
 134         if ( initrd_start )
 135         {
 136                 if (initrd_end > *memory_end_p)
 137                 {
 138                         printk("initrd extends beyond end of memory "
 139                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 140                                initrd_end,*memory_end_p);
 141                         initrd_start = 0;
 142                 }
 143         }
 144 #endif
 145 #endif
 146
 147 #if defined (CONFIG_MPC86XADS) || defined (CONFIG_MPC885ADS)
 148 #if defined(CONFIG_MTD_PHYSMAP)
 149        physmap_configure(binfo->bi_flashstart, binfo->bi_flashsize,
 150                                                MPC8xxADS_BANK_WIDTH, NULL);
 151 #ifdef CONFIG_MTD_PARTITIONS
 152        physmap_set_partitions(mpc8xxads_partitions, mpc8xxads_part_num);
 153 #endif /* CONFIG_MTD_PARTITIONS */
 154 #endif /* CONFIG_MTD_PHYSMAP */
 155 #endif
 156
 157         board_init();
 158 }
 159
 160 void
 161 abort(void)
 162 {
 163 #ifdef CONFIG_XMON
 164         xmon(0);
 165 #endif
 166         machine_restart(NULL);
 167
 168         /* not reached */
 169         for (;;);
 170 }
 171
 172 /* A place holder for time base interrupts, if they are ever enabled. */
 173 irqreturn_t timebase_interrupt(int irq, void * dev, struct pt_regs * regs)
 174 {
 175         printk ("timebase_interrupt()\n");
 176
 177         return IRQ_HANDLED;
 178 }
 179
 180 static struct irqaction tbint_irqaction = {
 181         .handler = timebase_interrupt,
 182         .mask = CPU_MASK_NONE,
 183         .name = "tbint",
 184 };
 185
 186 /* per-board overridable init_internal_rtc() function. */
 187 void __init __attribute__ ((weak))
 188 init_internal_rtc(void)
 189 {
 190         /* Disable the RTC one second and alarm interrupts. */
 191         clrbits16(&((immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc, (RTCSC_SIE | RTCSC_ALE));
 192
 193         /* Enable the RTC */
 194         setbits16(&((immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc, (RTCSC_RTF | RTCSC_RTE));
 195
 196 }
 197
 198 /* The decrementer counts at the system (internal) clock frequency divided by
 199  * sixteen, or external oscillator divided by four.  We force the processor
 200  * to use system clock divided by sixteen.
 201  */
 202 void __init m8xx_calibrate_decr(void)
 203 {
 204         bd_t    *binfo = (bd_t *)__res;
 205         int freq, fp, divisor;
 206
 207         /* Unlock the SCCR. */
 208         out_be32(&((immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk, ~KAPWR_KEY);
 209         out_be32(&((immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk, KAPWR_KEY);
 210
 211         /* Force all 8xx processors to use divide by 16 processor clock. */
 212         setbits32(&((immap_t *)IMAP_ADDR)->im_clkrst.car_sccr, 0x02000000);
 213         /* Processor frequency is MHz.
 214          * The value 'fp' is the number of decrementer ticks per second.
 215          */
 216         fp = binfo->bi_intfreq / 16;
 217         freq = fp*60;   /* try to make freq/1e6 an integer */
 218         divisor = 60;
 219         printk("Decrementer Frequency = %d/%d\n", freq, divisor);
 220         tb_ticks_per_jiffy = freq / HZ / divisor;
 221         tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
 222
 223         /* Perform some more timer/timebase initialization.  This used
 224          * to be done elsewhere, but other changes caused it to get
 225          * called more than once....that is a bad thing.
 226          *
 227          * First, unlock all of the registers we are going to modify.
 228          * To protect them from corruption during power down, registers
 229          * that are maintained by keep alive power are "locked".  To
 230          * modify these registers we have to write the key value to
 231          * the key location associated with the register.
 232          * Some boards power up with these unlocked, while others
 233          * are locked.  Writing anything (including the unlock code?)
 234          * to the unlocked registers will lock them again.  So, here
 235          * we guarantee the registers are locked, then we unlock them
 236          * for our use.
 237          */
 238         out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk, ~KAPWR_KEY);
 239         out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck, ~KAPWR_KEY);
 240         out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk, ~KAPWR_KEY);
 241         out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk, KAPWR_KEY);
 242         out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck, KAPWR_KEY);
 243         out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk, KAPWR_KEY);
 244
 245         init_internal_rtc();
 246
 247         /* Enabling the decrementer also enables the timebase interrupts
 248          * (or from the other point of view, to get decrementer interrupts
 249          * we have to enable the timebase).  The decrementer interrupt
 250          * is wired into the vector table, nothing to do here for that.
 251          */
 252         out_be16(&((immap_t *)IMAP_ADDR)->im_sit.sit_tbscr, (mk_int_int_mask(DEC_INTERRUPT) << 8) | (TBSCR_TBF | TBSCR_TBE));
 253
 254         if (setup_irq(DEC_INTERRUPT, &tbint_irqaction))
 255                 panic("Could not allocate timer IRQ!");
 256
 257 #ifdef CONFIG_8xx_WDT
 258         /* Install watchdog timer handler early because it might be
 259          * already enabled by the bootloader
 260          */
 261         m8xx_wdt_handler_install(binfo);
 262 #endif
 263 }
 264
 265 /* The RTC on the MPC8xx is an internal register.
 266  * We want to protect this during power down, so we need to unlock,
 267  * modify, and re-lock.
 268  */
 269 static int
 270 m8xx_set_rtc_time(unsigned long time)
 271 {
 272         out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck, KAPWR_KEY);
 273         out_be32(&((immap_t *)IMAP_ADDR)->im_sit.sit_rtc, time);
 274         out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck, ~KAPWR_KEY);
 275         return(0);
 276 }
 277
 278 static unsigned long
 279 m8xx_get_rtc_time(void)
 280 {
 281         /* Get time from the RTC. */
 282         return (unsigned long) in_be32(&((immap_t *)IMAP_ADDR)->im_sit.sit_rtc);
 283 }
 284
 285 static void
 286 m8xx_restart(char *cmd)
 287 {
 288         __volatile__ unsigned char dummy;
 289
 290         local_irq_disable();
 291
 292         setbits32(&((immap_t *)IMAP_ADDR)->im_clkrst.car_plprcr, 0x00000080);
 293         /* Clear the ME bit in MSR to cause checkstop on machine check
 294         */
 295         mtmsr(mfmsr() & ~0x1000);
 296
 297         dummy = in_8(&((immap_t *)IMAP_ADDR)->im_clkrst.res[0]);
 298         printk("Restart failed\n");
 299         while(1);
 300 }
 301
 302 static void
 303 m8xx_power_off(void)
 304 {
 305    m8xx_restart(NULL);
 306 }
 307
 308 static void
 309 m8xx_halt(void)
 310 {
 311    m8xx_restart(NULL);
 312 }
 313
 314
 315 static int
 316 m8xx_show_percpuinfo(struct seq_file *m, int i)
 317 {
 318         bd_t    *bp;
 319
 320         bp = (bd_t *)__res;
 321
 322         seq_printf(m, "clock\t\t: %uMHz\n"
 323                    "bus clock\t: %uMHz\n",
 324                    bp->bi_intfreq / 1000000,
 325                    bp->bi_busfreq / 1000000);
 326
 327         return 0;
 328 }
 329
 330 #ifdef CONFIG_PCI
 331 static struct irqaction mbx_i8259_irqaction = {
 332         .handler = mbx_i8259_action,
 333         .mask = CPU_MASK_NONE,
 334         .name = "i8259 cascade",
 335 };
 336 #endif
 337
 338 /* Initialize the internal interrupt controller.  The number of
 339  * interrupts supported can vary with the processor type, and the
 340  * 82xx family can have up to 64.
 341  * External interrupts can be either edge or level triggered, and
 342  * need to be initialized by the appropriate driver.
 343  */
 344 static void __init
 345 m8xx_init_IRQ(void)
 346 {
 347         int i;
 348
 349         for (i = SIU_IRQ_OFFSET ; i < SIU_IRQ_OFFSET + NR_SIU_INTS ; i++)
 350                 irq_desc[i].chip = &ppc8xx_pic;
 351
 352         cpm_interrupt_init();
 353
 354 #if defined(CONFIG_PCI)
 355         for (i = I8259_IRQ_OFFSET ; i < I8259_IRQ_OFFSET + NR_8259_INTS ; i++)
 356                 irq_desc[i].chip = &i8259_pic;
 357
 358         i8259_pic_irq_offset = I8259_IRQ_OFFSET;
 359         i8259_init(0);
 360
 361         /* The i8259 cascade interrupt must be level sensitive. */
 362
 363         clrbits32(&((immap_t *)IMAP_ADDR)->im_siu_conf.sc_siel, (0x80000000 >> ISA_BRIDGE_INT));
 364         if (setup_irq(ISA_BRIDGE_INT, &mbx_i8259_irqaction))
 365                 enable_irq(ISA_BRIDGE_INT);
 366 #endif  /* CONFIG_PCI */
 367 }
 368
 369 /* -------------------------------------------------------------------- */
 370
 371 /*
 372  * This is a big hack right now, but it may turn into something real
 373  * someday.
 374  *
 375  * For the 8xx boards (at this time anyway), there is nothing to initialize
 376  * associated the PROM.  Rather than include all of the prom.c
 377  * functions in the image just to get prom_init, all we really need right
 378  * now is the initialization of the physical memory region.
 379  */
 380 static unsigned long __init
 381 m8xx_find_end_of_memory(void)
 382 {
 383         bd_t    *binfo;
 384         extern unsigned char __res[];
 385
 386         binfo = (bd_t *)__res;
 387
 388         return binfo->bi_memsize;
 389 }
 390
 391 /*
 392  * Now map in some of the I/O space that is generically needed
 393  * or shared with multiple devices.
 394  * All of this fits into the same 4Mbyte region, so it only
 395  * requires one page table page.  (or at least it used to  -- paulus)
 396  */
 397 static void __init
 398 m8xx_map_io(void)
 399 {
 400         io_block_mapping(IMAP_ADDR, IMAP_ADDR, IMAP_SIZE, _PAGE_IO);
 401 #ifdef CONFIG_MBX
 402         io_block_mapping(NVRAM_ADDR, NVRAM_ADDR, NVRAM_SIZE, _PAGE_IO);
 403         io_block_mapping(MBX_CSR_ADDR, MBX_CSR_ADDR, MBX_CSR_SIZE, _PAGE_IO);
 404         io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO);
 405
 406         /* Map some of the PCI/ISA I/O space to get the IDE interface.
 407         */
 408         io_block_mapping(PCI_ISA_IO_ADDR, PCI_ISA_IO_ADDR, 0x4000, _PAGE_IO);
 409         io_block_mapping(PCI_IDE_ADDR, PCI_IDE_ADDR, 0x4000, _PAGE_IO);
 410 #endif
 411 #if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC)
 412         io_block_mapping(RPX_CSR_ADDR, RPX_CSR_ADDR, RPX_CSR_SIZE, _PAGE_IO);
 413 #if !defined(CONFIG_PCI)
 414         io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO);
 415 #endif
 416 #endif
 417 #if defined(CONFIG_HTDMSOUND) || defined(CONFIG_RPXTOUCH) || defined(CONFIG_FB_RPX)
 418         io_block_mapping(HIOX_CSR_ADDR, HIOX_CSR_ADDR, HIOX_CSR_SIZE, _PAGE_IO);
 419 #endif
 420 #ifdef CONFIG_FADS
 421         io_block_mapping(BCSR_ADDR, BCSR_ADDR, BCSR_SIZE, _PAGE_IO);
 422 #endif
 423 #ifdef CONFIG_PCI
 424         io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO);
 425 #endif
 426 #if defined(CONFIG_NETTA)
 427         io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO);
 428 #endif
 429 }
 430
 431 void __init
 432 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 433                 unsigned long r6, unsigned long r7)
 434 {
 435         parse_bootinfo(find_bootinfo());
 436
 437         if ( r3 )
 438                 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
 439
 440 #ifdef CONFIG_PCI
 441         m8xx_setup_pci_ptrs();
 442 #endif
 443
 444 #ifdef CONFIG_BLK_DEV_INITRD
 445         /* take care of initrd if we have one */
 446         if ( r4 )
 447         {
 448                 initrd_start = r4 + KERNELBASE;
 449                 initrd_end = r5 + KERNELBASE;
 450         }
 451 #endif /* CONFIG_BLK_DEV_INITRD */
 452         /* take care of cmd line */
 453         if ( r6 )
 454         {
 455                 *(char *)(r7+KERNELBASE) = 0;
 456                 strcpy(cmd_line, (char *)(r6+KERNELBASE));
 457         }
 458
 459         identify_ppc_sys_by_name(BOARD_CHIP_NAME);
 460
 461         ppc_md.setup_arch               = m8xx_setup_arch;
 462         ppc_md.show_percpuinfo          = m8xx_show_percpuinfo;
 463         ppc_md.init_IRQ                 = m8xx_init_IRQ;
 464         ppc_md.get_irq                  = m8xx_get_irq;
 465         ppc_md.init                     = NULL;
 466
 467         ppc_md.restart                  = m8xx_restart;
 468         ppc_md.power_off                = m8xx_power_off;
 469         ppc_md.halt                     = m8xx_halt;
 470
 471         ppc_md.time_init                = NULL;
 472         ppc_md.set_rtc_time             = m8xx_set_rtc_time;
 473         ppc_md.get_rtc_time             = m8xx_get_rtc_time;
 474         ppc_md.calibrate_decr           = m8xx_calibrate_decr;
 475
 476         ppc_md.find_end_of_memory       = m8xx_find_end_of_memory;
 477         ppc_md.setup_io_mappings        = m8xx_map_io;
 478
 479 #if defined(CONFIG_BLK_DEV_MPC8xx_IDE)
 480         m8xx_ide_init();
 481 #endif
 482 }