/* * linux/arch/ppc/kernel/setup.c * * Copyright (C) 1995 Linus Torvalds * Adapted from 'alpha' version by Gary Thomas * Modified by Cort Dougan (cort@cs.nmt.edu) * Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net) * Further modified for generic 8xx by Dan. */ /* * bootup setup stuff.. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ppc8xx_pic.h" extern int i8259_pic_irq_offset; /* defined in arch/ppc/kernel/i8259.c */ static int m8xx_set_rtc_time(unsigned long time); static unsigned long m8xx_get_rtc_time(void); void m8xx_calibrate_decr(void); unsigned char __res[sizeof(bd_t)]; extern void m8xx_ide_init(void); extern unsigned long find_available_memory(void); extern void m8xx_cpm_reset(uint); extern void m8xx_wdt_handler_install(bd_t *bp); void __init m8xx_setup_arch(void) { int cpm_page; cpm_page = (int) alloc_bootmem_pages(PAGE_SIZE); /* Reset the Communication Processor Module. */ m8xx_cpm_reset(cpm_page); #ifdef notdef ROOT_DEV = to_kdev_t(0x0301); /* hda1 */ #endif #ifdef CONFIG_BLK_DEV_INITRD #if 0 ROOT_DEV = to_kdev_t(0x0200); /* floppy */ rd_prompt = 1; rd_doload = 1; rd_image_start = 0; #endif #if 0 /* XXX this may need to be updated for the new bootmem stuff, or possibly just deleted (see set_phys_avail() in init.c). - paulus. */ /* initrd_start and size are setup by boot/head.S and kernel/head.S */ if ( initrd_start ) { if (initrd_end > *memory_end_p) { printk("initrd extends beyond end of memory " "(0x%08lx > 0x%08lx)\ndisabling initrd\n", initrd_end,*memory_end_p); initrd_start = 0; } } #endif #endif } void abort(void) { #ifdef CONFIG_XMON xmon(0); #endif machine_restart(NULL); /* not reached */ for (;;); } /* A place holder for time base interrupts, if they are ever enabled. */ void timebase_interrupt(int irq, void * dev, struct pt_regs * regs) { printk ("timebase_interrupt()\n"); } /* The decrementer counts at the system (internal) clock frequency divided by * sixteen, or external oscillator divided by four. We force the processor * to use system clock divided by sixteen. */ void __init m8xx_calibrate_decr(void) { bd_t *binfo = (bd_t *)__res; int freq, fp, divisor; /* Unlock the SCCR. */ ((volatile immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk = ~KAPWR_KEY; ((volatile immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk = KAPWR_KEY; /* Force all 8xx processors to use divide by 16 processor clock. */ ((volatile immap_t *)IMAP_ADDR)->im_clkrst.car_sccr |= 0x02000000; /* Processor frequency is MHz. * The value 'fp' is the number of decrementer ticks per second. */ fp = binfo->bi_intfreq / 16; freq = fp*60; /* try to make freq/1e6 an integer */ divisor = 60; printk("Decrementer Frequency = %d/%d\n", freq, divisor); tb_ticks_per_jiffy = freq / HZ / divisor; tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000); /* Perform some more timer/timebase initialization. This used * to be done elsewhere, but other changes caused it to get * called more than once....that is a bad thing. * * First, unlock all of the registers we are going to modify. * To protect them from corruption during power down, registers * that are maintained by keep alive power are "locked". To * modify these registers we have to write the key value to * the key location associated with the register. * Some boards power up with these unlocked, while others * are locked. Writing anything (including the unlock code?) * to the unlocked registers will lock them again. So, here * we guarantee the registers are locked, then we unlock them * for our use. */ ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk = ~KAPWR_KEY; ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck = ~KAPWR_KEY; ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk = ~KAPWR_KEY; ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk = KAPWR_KEY; ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck = KAPWR_KEY; ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk = KAPWR_KEY; /* Disable the RTC one second and alarm interrupts. */ ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc &= ~(RTCSC_SIE | RTCSC_ALE); /* Enable the RTC */ ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc |= (RTCSC_RTF | RTCSC_RTE); /* Enabling the decrementer also enables the timebase interrupts * (or from the other point of view, to get decrementer interrupts * we have to enable the timebase). The decrementer interrupt * is wired into the vector table, nothing to do here for that. */ ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_tbscr = ((mk_int_int_mask(DEC_INTERRUPT) << 8) | (TBSCR_TBF | TBSCR_TBE)); if (request_irq(DEC_INTERRUPT, timebase_interrupt, 0, "tbint", NULL) != 0) panic("Could not allocate timer IRQ!"); #ifdef CONFIG_8xx_WDT /* Install watchdog timer handler early because it might be * already enabled by the bootloader */ m8xx_wdt_handler_install(binfo); #endif } /* The RTC on the MPC8xx is an internal register. * We want to protect this during power down, so we need to unlock, * modify, and re-lock. */ static int m8xx_set_rtc_time(unsigned long time) { ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck = KAPWR_KEY; ((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtc = time; ((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck = ~KAPWR_KEY; return(0); } static unsigned long m8xx_get_rtc_time(void) { /* Get time from the RTC. */ return((unsigned long)(((immap_t *)IMAP_ADDR)->im_sit.sit_rtc)); } static void m8xx_restart(char *cmd) { __volatile__ unsigned char dummy; uint msr; cli(); ((immap_t *)IMAP_ADDR)->im_clkrst.car_plprcr |= 0x00000080; /* Clear the ME bit in MSR to cause checkstop on machine check */ __asm__("mfmsr %0" : "=r" (msr) ); msr &= ~0x1000; __asm__("mtmsr %0" : : "r" (msr) ); dummy = ((immap_t *)IMAP_ADDR)->im_clkrst.res[0]; printk("Restart failed\n"); while(1); } static void m8xx_power_off(void) { m8xx_restart(NULL); } static void m8xx_halt(void) { m8xx_restart(NULL); } static int m8xx_show_percpuinfo(struct seq_file *m, int i) { bd_t *bp; bp = (bd_t *)__res; seq_printf(m, "clock\t\t: %dMHz\n" "bus clock\t: %dMHz\n", bp->bi_intfreq / 1000000, bp->bi_busfreq / 1000000); return 0; } /* Initialize the internal interrupt controller. The number of * interrupts supported can vary with the processor type, and the * 82xx family can have up to 64. * External interrupts can be either edge or level triggered, and * need to be initialized by the appropriate driver. */ static void __init m8xx_init_IRQ(void) { int i; void cpm_interrupt_init(void); for (i = SIU_IRQ_OFFSET ; i < SIU_IRQ_OFFSET + NR_SIU_INTS ; i++) irq_desc[i].handler = &ppc8xx_pic; cpm_interrupt_init(); #if defined(CONFIG_PCI) for (i = I8259_IRQ_OFFSET ; i < I8259_IRQ_OFFSET + NR_8259_INTS ; i++) irq_desc[i].handler = &i8259_pic; i8259_pic_irq_offset = I8259_IRQ_OFFSET; i8259_init(0); /* The i8259 cascade interrupt must be level sensitive. */ ((immap_t *)IMAP_ADDR)->im_siu_conf.sc_siel &= ~(0x80000000 >> ISA_BRIDGE_INT); if (request_irq(ISA_BRIDGE_INT, mbx_i8259_action, 0, "i8259 cascade", NULL) != 0) panic("Could not allocate 8259 IRQ!"); #endif /* CONFIG_PCI */ } /* -------------------------------------------------------------------- */ /* * This is a big hack right now, but it may turn into something real * someday. * * For the 8xx boards (at this time anyway), there is nothing to initialize * associated the PROM. Rather than include all of the prom.c * functions in the image just to get prom_init, all we really need right * now is the initialization of the physical memory region. */ static unsigned long __init m8xx_find_end_of_memory(void) { bd_t *binfo; extern unsigned char __res[]; binfo = (bd_t *)__res; return binfo->bi_memsize; } /* * Now map in some of the I/O space that is generically needed * or shared with multiple devices. * All of this fits into the same 4Mbyte region, so it only * requires one page table page. (or at least it used to -- paulus) */ static void __init m8xx_map_io(void) { io_block_mapping(IMAP_ADDR, IMAP_ADDR, IMAP_SIZE, _PAGE_IO); #ifdef CONFIG_MBX io_block_mapping(NVRAM_ADDR, NVRAM_ADDR, NVRAM_SIZE, _PAGE_IO); io_block_mapping(MBX_CSR_ADDR, MBX_CSR_ADDR, MBX_CSR_SIZE, _PAGE_IO); io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO); /* Map some of the PCI/ISA I/O space to get the IDE interface. */ io_block_mapping(PCI_ISA_IO_ADDR, PCI_ISA_IO_ADDR, 0x4000, _PAGE_IO); io_block_mapping(PCI_IDE_ADDR, PCI_IDE_ADDR, 0x4000, _PAGE_IO); #endif #if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC) io_block_mapping(RPX_CSR_ADDR, RPX_CSR_ADDR, RPX_CSR_SIZE, _PAGE_IO); #if !defined(CONFIG_PCI) io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO); #endif #endif #ifdef CONFIG_HTDMSOUND io_block_mapping(HIOX_CSR_ADDR, HIOX_CSR_ADDR, HIOX_CSR_SIZE, _PAGE_IO); #endif #ifdef CONFIG_FADS io_block_mapping(BCSR_ADDR, BCSR_ADDR, BCSR_SIZE, _PAGE_IO); #endif #ifdef CONFIG_PCI io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO); #endif } void __init platform_init(unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, unsigned long r7) { parse_bootinfo(find_bootinfo()); if ( r3 ) memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) ); #ifdef CONFIG_PCI m8xx_setup_pci_ptrs(); #endif #ifdef CONFIG_BLK_DEV_INITRD /* take care of initrd if we have one */ if ( r4 ) { initrd_start = r4 + KERNELBASE; initrd_end = r5 + KERNELBASE; } #endif /* CONFIG_BLK_DEV_INITRD */ /* take care of cmd line */ if ( r6 ) { *(char *)(r7+KERNELBASE) = 0; strcpy(cmd_line, (char *)(r6+KERNELBASE)); } ppc_md.setup_arch = m8xx_setup_arch; ppc_md.show_percpuinfo = m8xx_show_percpuinfo; ppc_md.irq_cannonicalize = NULL; ppc_md.init_IRQ = m8xx_init_IRQ; ppc_md.get_irq = m8xx_get_irq; ppc_md.init = NULL; ppc_md.restart = m8xx_restart; ppc_md.power_off = m8xx_power_off; ppc_md.halt = m8xx_halt; ppc_md.time_init = NULL; ppc_md.set_rtc_time = m8xx_set_rtc_time; ppc_md.get_rtc_time = m8xx_get_rtc_time; ppc_md.calibrate_decr = m8xx_calibrate_decr; ppc_md.find_end_of_memory = m8xx_find_end_of_memory; ppc_md.setup_io_mappings = m8xx_map_io; ppc_md.kbd_setkeycode = NULL; ppc_md.kbd_getkeycode = NULL; ppc_md.kbd_translate = NULL; ppc_md.kbd_unexpected_up = NULL; ppc_md.kbd_leds = NULL; ppc_md.kbd_init_hw = NULL; ppc_md.ppc_kbd_sysrq_xlate = NULL; #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE) m8xx_ide_init(); #endif }