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/*
* 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.
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/root_dev.h>
#include <linux/seq_file.h>
#include <linux/irq.h>
#include <asm/mmu.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/mpc8260.h>
#include <asm/cpm2.h>
#include <asm/machdep.h>
#include <asm/bootinfo.h>
#include <asm/time.h>
#include "cpm2_pic.h"
unsigned char __res[sizeof(bd_t)];
extern void pq2_find_bridges(void);
extern void pq2pci_init_irq(void);
extern void idma_pci9_init(void);
/* Place-holder for board-specific init */
void __attribute__ ((weak)) __init
m82xx_board_setup(void)
{
}
static void __init
m8260_setup_arch(void)
{
/* Print out Vendor and Machine info. */
printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE);
/* Reset the Communication Processor Module. */
cpm2_reset();
#ifdef CONFIG_8260_PCI9
/* Initialise IDMA for PCI erratum workaround */
idma_pci9_init();
#endif
#ifdef CONFIG_PCI_8260
pq2_find_bridges();
#endif
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start)
ROOT_DEV = Root_RAM0;
#endif
identify_ppc_sys_by_name_and_id(BOARD_CHIP_NAME,
in_be32(CPM_MAP_ADDR + CPM_IMMR_OFFSET));
m82xx_board_setup();
}
/* 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 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);
}
#ifndef BOOTROM_RESTART_ADDR
#warning "Using default BOOTROM_RESTART_ADDR!"
#define BOOTROM_RESTART_ADDR 0xff000104
#endif
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 = BOOTROM_RESTART_ADDR;
if (cmd != NULL) {
if (!strncmp(cmd, "startaddr=", 10))
startaddr = simple_strtoul(&cmd[10], NULL, 0);
}
m8260_gorom((void*)__pa(__res), startaddr);
}
static void
m8260_halt(void)
{
local_irq_disable();
while (1);
}
static void
m8260_power_off(void)
{
m8260_halt();
}
static int
m8260_show_cpuinfo(struct seq_file *m)
{
bd_t *bp = (bd_t *)__res;
seq_printf(m, "vendor\t\t: %s\n"
"machine\t\t: %s\n"
"\n"
"mem size\t\t: 0x%08x\n"
"console baud\t\t: %d\n"
"\n"
"core clock\t: %u MHz\n"
"CPM clock\t: %u MHz\n"
"bus clock\t: %u MHz\n",
CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize,
bp->bi_baudrate, 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)
{
cpm2_init_IRQ();
/* Initialize the default interrupt mapping priorities,
* in case the boot rom changed something on us.
*/
cpm2_immr->im_intctl.ic_siprr = 0x05309770;
#if defined(CONFIG_PCI) && (defined(CONFIG_ADS8272) || defined(CONFIG_PQ2FADS))
/* Initialize stuff for the 82xx CPLD IC and install demux */
pq2pci_init_irq();
#endif
}
/*
* Same hack as 8xx
*/
static unsigned long __init
m8260_find_end_of_memory(void)
{
bd_t *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)
{
uint addr;
/* Map IMMR region to a 256MB BAT */
addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
/* Map I/O region to a 256MB BAT */
io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
}
/* Place-holder for board-specific ppc_md hooking */
void __attribute__ ((weak)) __init
m82xx_board_init(void)
{
}
/* Inputs:
* 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.
*/
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_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_cpuinfo = m8260_show_cpuinfo;
ppc_md.init_IRQ = m8260_init_IRQ;
ppc_md.get_irq = cpm2_get_irq;
ppc_md.restart = m8260_restart;
ppc_md.power_off = m8260_power_off;
ppc_md.halt = m8260_halt;
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;
/* Call back for board-specific settings and overrides. */
m82xx_board_init();
}
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