mirror of
https://github.com/torvalds/linux.git
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1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
256 lines
4.8 KiB
C
256 lines
4.8 KiB
C
/*
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*
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* Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
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*
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* Module name: oak.c
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*
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* Description:
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* Architecture- / platform-specific boot-time initialization code for
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* the IBM PowerPC 403GCX "Oak" evaluation board. Adapted from original
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* code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
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* <dan@net4x.com>.
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*
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/threads.h>
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#include <linux/param.h>
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#include <linux/string.h>
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#include <linux/initrd.h>
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#include <linux/irq.h>
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#include <linux/seq_file.h>
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#include <asm/board.h>
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#include <asm/machdep.h>
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#include <asm/page.h>
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#include <asm/bootinfo.h>
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#include <asm/ppc4xx_pic.h>
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#include <asm/time.h>
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#include "oak.h"
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/* Function Prototypes */
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extern void abort(void);
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/* Global Variables */
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unsigned char __res[sizeof(bd_t)];
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/*
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* void __init oak_init()
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*
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* Description:
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* This routine...
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*
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* Input(s):
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* r3 - Optional pointer to a board information structure.
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* r4 - Optional pointer to the physical starting address of the init RAM
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* disk.
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* r5 - Optional pointer to the physical ending address of the init RAM
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* disk.
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* r6 - Optional pointer to the physical starting address of any kernel
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* command-line parameters.
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* r7 - Optional pointer to the physical ending address of any kernel
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* command-line parameters.
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*
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* Output(s):
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* N/A
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*
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* Returns:
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* N/A
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*
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*/
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void __init
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platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7)
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{
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parse_bootinfo(find_bootinfo());
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/*
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* If we were passed in a board information, copy it into the
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* residual data area.
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*/
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if (r3) {
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memcpy((void *)__res, (void *)(r3 + KERNELBASE), sizeof(bd_t));
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}
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#if defined(CONFIG_BLK_DEV_INITRD)
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/*
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* If the init RAM disk has been configured in, and there's a valid
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* starting address for it, set it up.
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*/
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if (r4) {
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initrd_start = r4 + KERNELBASE;
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initrd_end = r5 + KERNELBASE;
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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/* Copy the kernel command line arguments to a safe place. */
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if (r6) {
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*(char *)(r7 + KERNELBASE) = 0;
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strcpy(cmd_line, (char *)(r6 + KERNELBASE));
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}
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/* Initialize machine-dependency vectors */
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ppc_md.setup_arch = oak_setup_arch;
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ppc_md.show_percpuinfo = oak_show_percpuinfo;
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ppc_md.irq_canonicalize = NULL;
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ppc_md.init_IRQ = ppc4xx_pic_init;
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ppc_md.get_irq = NULL; /* Set in ppc4xx_pic_init() */
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ppc_md.init = NULL;
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ppc_md.restart = oak_restart;
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ppc_md.power_off = oak_power_off;
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ppc_md.halt = oak_halt;
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ppc_md.time_init = oak_time_init;
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ppc_md.set_rtc_time = oak_set_rtc_time;
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ppc_md.get_rtc_time = oak_get_rtc_time;
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ppc_md.calibrate_decr = oak_calibrate_decr;
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}
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/*
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* Document me.
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*/
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void __init
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oak_setup_arch(void)
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{
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/* XXX - Implement me */
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}
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/*
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* int oak_show_percpuinfo()
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*
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* Description:
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* This routine pretty-prints the platform's internal CPU and bus clock
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* frequencies into the buffer for usage in /proc/cpuinfo.
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*
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* Input(s):
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* *buffer - Buffer into which CPU and bus clock frequencies are to be
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* printed.
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*
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* Output(s):
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* *buffer - Buffer with the CPU and bus clock frequencies.
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*
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* Returns:
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* The number of bytes copied into 'buffer' if OK, otherwise zero or less
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* on error.
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*/
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int
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oak_show_percpuinfo(struct seq_file *m, int i)
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{
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bd_t *bp = (bd_t *)__res;
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seq_printf(m, "clock\t\t: %dMHz\n"
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"bus clock\t\t: %dMHz\n",
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bp->bi_intfreq / 1000000,
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bp->bi_busfreq / 1000000);
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return 0;
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}
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/*
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* Document me.
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*/
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void
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oak_restart(char *cmd)
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{
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abort();
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}
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/*
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* Document me.
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*/
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void
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oak_power_off(void)
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{
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oak_restart(NULL);
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}
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/*
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* Document me.
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*/
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void
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oak_halt(void)
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{
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oak_restart(NULL);
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}
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/*
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* Document me.
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*/
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long __init
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oak_time_init(void)
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{
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/* XXX - Implement me */
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return 0;
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}
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/*
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* Document me.
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*/
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int __init
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oak_set_rtc_time(unsigned long time)
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{
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/* XXX - Implement me */
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return (0);
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}
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/*
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* Document me.
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*/
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unsigned long __init
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oak_get_rtc_time(void)
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{
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/* XXX - Implement me */
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return (0);
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}
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/*
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* void __init oak_calibrate_decr()
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*
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* Description:
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* This routine retrieves the internal processor frequency from the board
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* information structure, sets up the kernel timer decrementer based on
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* that value, enables the 403 programmable interval timer (PIT) and sets
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* it up for auto-reload.
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*
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* Input(s):
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* N/A
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*
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* Output(s):
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* N/A
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*
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* Returns:
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* N/A
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*
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*/
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void __init
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oak_calibrate_decr(void)
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{
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unsigned int freq;
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bd_t *bip = (bd_t *)__res;
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freq = bip->bi_intfreq;
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decrementer_count = freq / HZ;
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count_period_num = 1;
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count_period_den = freq;
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/* Enable the PIT and set auto-reload of its value */
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mtspr(SPRN_TCR, TCR_PIE | TCR_ARE);
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/* Clear any pending timer interrupts */
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mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_PIS | TSR_FIS);
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}
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