m8260_setup.c
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上传日期:2013-02-24
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- /*
- * BK Id: SCCS/s.m8260_setup.c 1.30 11/13/01 21:26:07 paulus
- */
- /*
- * 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 and 8260 by Dan.
- */
- /*
- * bootup setup stuff..
- */
- #include <linux/config.h>
- #include <linux/errno.h>
- #include <linux/sched.h>
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/stddef.h>
- #include <linux/unistd.h>
- #include <linux/ptrace.h>
- #include <linux/slab.h>
- #include <linux/user.h>
- #include <linux/a.out.h>
- #include <linux/tty.h>
- #include <linux/major.h>
- #include <linux/interrupt.h>
- #include <linux/reboot.h>
- #include <linux/init.h>
- #include <linux/blk.h>
- #include <linux/ioport.h>
- #include <linux/ide.h>
- #include <linux/seq_file.h>
- #include <asm/mmu.h>
- #include <asm/processor.h>
- #include <asm/residual.h>
- #include <asm/io.h>
- #include <asm/pgtable.h>
- #include <asm/ide.h>
- #include <asm/mpc8260.h>
- #include <asm/immap_8260.h>
- #include <asm/machdep.h>
- #include <asm/time.h>
- #include "ppc8260_pic.h"
- static int m8260_set_rtc_time(unsigned long time);
- static unsigned long m8260_get_rtc_time(void);
- static void m8260_calibrate_decr(void);
- unsigned char __res[sizeof(bd_t)];
- extern void m8260_cpm_reset(void);
- static void __init
- m8260_setup_arch(void)
- {
- /* Reset the Communication Processor Module.
- */
- m8260_cpm_reset();
- }
- static void
- abort(void)
- {
- #ifdef CONFIG_XMON
- extern void xmon(void *);
- xmon(0);
- #endif
- machine_restart(NULL);
- }
- /* The decrementer counts at the system (internal) clock frequency
- * divided by four.
- */
- static void __init
- m8260_calibrate_decr(void)
- {
- bd_t *binfo = (bd_t *)__res;
- int freq, divisor;
- freq = binfo->bi_busfreq;
- divisor = 4;
- tb_ticks_per_jiffy = freq / HZ / divisor;
- tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
- }
- /* The 8260 has an internal 1-second timer update register that
- * we should use for this purpose.
- */
- static uint rtc_time;
- static static int
- m8260_set_rtc_time(unsigned long time)
- {
- rtc_time = time;
- return(0);
- }
- static unsigned long
- m8260_get_rtc_time(void)
- {
- /* Get time from the RTC.
- */
- return((unsigned long)rtc_time);
- }
- static void
- m8260_restart(char *cmd)
- {
- extern void m8260_gorom(bd_t *bi, uint addr);
- uint startaddr;
- /* Most boot roms have a warmstart as the second instruction
- * of the reset vector. If that doesn't work for you, change this
- * or the reboot program to send a proper address.
- */
- startaddr = 0xff000104;
- if (cmd != NULL) {
- if (!strncmp(cmd, "startaddr=", 10))
- startaddr = simple_strtoul(&cmd[10], NULL, 0);
- }
- m8260_gorom((unsigned int)__pa(__res), startaddr);
- }
- static void
- m8260_power_off(void)
- {
- m8260_restart(NULL);
- }
- static void
- m8260_halt(void)
- {
- m8260_restart(NULL);
- }
- static int
- m8260_show_percpuinfo(struct seq_file *m, int i)
- {
- bd_t *bp;
- bp = (bd_t *)__res;
-
- seq_printf(m, "core clockt: %d MHzn"
- "CPM clockt: %d MHzn"
- "bus clockt: %d MHzn",
- bp->bi_intfreq / 1000000,
- bp->bi_cpmfreq / 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
- * 8260 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
- m8260_init_IRQ(void)
- {
- int i;
- void cpm_interrupt_init(void);
- #if 0
- ppc8260_pic.irq_offset = 0;
- #endif
- for ( i = 0 ; i < NR_SIU_INTS ; i++ )
- irq_desc[i].handler = &ppc8260_pic;
-
- /* Initialize the default interrupt mapping priorities,
- * in case the boot rom changed something on us.
- */
- immr->im_intctl.ic_sicr = 0;
- immr->im_intctl.ic_siprr = 0x05309770;
- immr->im_intctl.ic_scprrh = 0x05309770;
- immr->im_intctl.ic_scprrl = 0x05309770;
- }
- /*
- * Same hack as 8xx
- */
- static unsigned long __init
- m8260_find_end_of_memory(void)
- {
- bd_t *binfo;
- extern unsigned char __res[];
-
- binfo = (bd_t *)__res;
- return binfo->bi_memsize;
- }
- /* Map the IMMR, plus anything else we can cover
- * in that upper space according to the memory controller
- * chip select mapping. Grab another bunch of space
- * below that for stuff we can't cover in the upper.
- */
- static void __init
- m8260_map_io(void)
- {
- io_block_mapping(0xf0000000, 0xf0000000, 0x10000000, _PAGE_IO);
- io_block_mapping(0xe0000000, 0xe0000000, 0x10000000, _PAGE_IO);
- }
- void __init
- platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7)
- {
- if ( r3 )
- memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
-
- #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 = m8260_setup_arch;
- ppc_md.show_percpuinfo = m8260_show_percpuinfo;
- ppc_md.irq_cannonicalize = NULL;
- ppc_md.init_IRQ = m8260_init_IRQ;
- ppc_md.get_irq = m8260_get_irq;
- ppc_md.init = NULL;
- ppc_md.restart = m8260_restart;
- ppc_md.power_off = m8260_power_off;
- ppc_md.halt = m8260_halt;
- ppc_md.time_init = NULL;
- ppc_md.set_rtc_time = m8260_set_rtc_time;
- ppc_md.get_rtc_time = m8260_get_rtc_time;
- ppc_md.calibrate_decr = m8260_calibrate_decr;
- ppc_md.find_end_of_memory = m8260_find_end_of_memory;
- ppc_md.setup_io_mappings = m8260_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;
- }
- /* Mainly for ksyms.
- */
- int
- request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *),
- unsigned long flag, const char *naem, void *dev)
- {
- panic("request IRQn");
- }