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