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linux/arch/ppc/syslib/ppc4xx_setup.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
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!
2005-04-16 15:20:36 -07:00

322 lines
7.6 KiB
C
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/*
*
* Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
*
* Copyright 2000-2001 MontaVista Software Inc.
* Completed implementation.
* Author: MontaVista Software, Inc. <source@mvista.com>
* Frank Rowand <frank_rowand@mvista.com>
* Debbie Chu <debbie_chu@mvista.com>
* Further modifications by Armin Kuster
*
* Module name: ppc4xx_setup.c
*
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/irq.h>
#include <linux/reboot.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/initrd.h>
#include <linux/pci.h>
#include <linux/rtc.h>
#include <linux/console.h>
#include <linux/ide.h>
#include <linux/serial_reg.h>
#include <linux/seq_file.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/machdep.h>
#include <asm/page.h>
#include <asm/kgdb.h>
#include <asm/ibm4xx.h>
#include <asm/time.h>
#include <asm/todc.h>
#include <asm/ppc4xx_pic.h>
#include <asm/pci-bridge.h>
#include <asm/bootinfo.h>
#include <syslib/gen550.h>
/* Function Prototypes */
extern void abort(void);
extern void ppc4xx_find_bridges(void);
extern void ppc4xx_wdt_heartbeat(void);
extern int wdt_enable;
extern unsigned long wdt_period;
/* Global Variables */
bd_t __res;
void __init
ppc4xx_setup_arch(void)
{
#if !defined(CONFIG_BDI_SWITCH)
/*
* The Abatron BDI JTAG debugger does not tolerate others
* mucking with the debug registers.
*/
mtspr(SPRN_DBCR0, (DBCR0_IDM));
mtspr(SPRN_DBSR, 0xffffffff);
#endif
/* Setup PCI host bridges */
#ifdef CONFIG_PCI
ppc4xx_find_bridges();
#endif
}
/*
* This routine pretty-prints the platform's internal CPU clock
* frequencies into the buffer for usage in /proc/cpuinfo.
*/
static int
ppc4xx_show_percpuinfo(struct seq_file *m, int i)
{
seq_printf(m, "clock\t\t: %ldMHz\n", (long)__res.bi_intfreq / 1000000);
return 0;
}
/*
* This routine pretty-prints the platform's internal bus clock
* frequencies into the buffer for usage in /proc/cpuinfo.
*/
static int
ppc4xx_show_cpuinfo(struct seq_file *m)
{
bd_t *bip = &__res;
seq_printf(m, "machine\t\t: %s\n", PPC4xx_MACHINE_NAME);
seq_printf(m, "plb bus clock\t: %ldMHz\n",
(long) bip->bi_busfreq / 1000000);
#ifdef CONFIG_PCI
seq_printf(m, "pci bus clock\t: %dMHz\n",
bip->bi_pci_busfreq / 1000000);
#endif
return 0;
}
/*
* Return the virtual address representing the top of physical RAM.
*/
static unsigned long __init
ppc4xx_find_end_of_memory(void)
{
return ((unsigned long) __res.bi_memsize);
}
void __init
ppc4xx_map_io(void)
{
io_block_mapping(PPC4xx_ONB_IO_VADDR,
PPC4xx_ONB_IO_PADDR, PPC4xx_ONB_IO_SIZE, _PAGE_IO);
#ifdef CONFIG_PCI
io_block_mapping(PPC4xx_PCI_IO_VADDR,
PPC4xx_PCI_IO_PADDR, PPC4xx_PCI_IO_SIZE, _PAGE_IO);
io_block_mapping(PPC4xx_PCI_CFG_VADDR,
PPC4xx_PCI_CFG_PADDR, PPC4xx_PCI_CFG_SIZE, _PAGE_IO);
io_block_mapping(PPC4xx_PCI_LCFG_VADDR,
PPC4xx_PCI_LCFG_PADDR, PPC4xx_PCI_LCFG_SIZE, _PAGE_IO);
#endif
}
void __init
ppc4xx_init_IRQ(void)
{
ppc4xx_pic_init();
}
static void
ppc4xx_restart(char *cmd)
{
printk("%s\n", cmd);
abort();
}
static void
ppc4xx_power_off(void)
{
printk("System Halted\n");
local_irq_disable();
while (1) ;
}
static void
ppc4xx_halt(void)
{
printk("System Halted\n");
local_irq_disable();
while (1) ;
}
/*
* This routine retrieves the internal processor frequency from the board
* information structure, sets up the kernel timer decrementer based on
* that value, enables the 4xx programmable interval timer (PIT) and sets
* it up for auto-reload.
*/
static void __init
ppc4xx_calibrate_decr(void)
{
unsigned int freq;
bd_t *bip = &__res;
#if defined(CONFIG_WALNUT) || defined(CONFIG_ASH) || defined(CONFIG_SYCAMORE)
/* Walnut boot rom sets DCR CHCR1 (aka CPC0_CR1) bit CETE to 1 */
mtdcr(DCRN_CHCR1, mfdcr(DCRN_CHCR1) & ~CHR1_CETE);
#endif
freq = bip->bi_tbfreq;
tb_ticks_per_jiffy = freq / HZ;
tb_to_us = mulhwu_scale_factor(freq, 1000000);
/* Set the time base to zero.
** At 200 Mhz, time base will rollover in ~2925 years.
*/
mtspr(SPRN_TBWL, 0);
mtspr(SPRN_TBWU, 0);
/* Clear any pending timer interrupts */
mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_PIS | TSR_FIS);
mtspr(SPRN_TCR, TCR_PIE | TCR_ARE);
/* Set the PIT reload value and just let it run. */
mtspr(SPRN_PIT, tb_ticks_per_jiffy);
}
/*
* IDE stuff.
* should be generic for every IDE PCI chipset
*/
#if defined(CONFIG_PCI) && defined(CONFIG_IDE)
static void
ppc4xx_ide_init_hwif_ports(hw_regs_t * hw, unsigned long data_port,
unsigned long ctrl_port, int *irq)
{
int i;
for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; ++i)
hw->io_ports[i] = data_port + i - IDE_DATA_OFFSET;
hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;
}
#endif /* defined(CONFIG_PCI) && defined(CONFIG_IDE) */
TODC_ALLOC();
/*
* 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.
*/
void __init
ppc4xx_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)
__res = *(bd_t *)(r3 + KERNELBASE);
#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));
}
#if defined(CONFIG_PPC405_WDT)
/* Look for wdt= option on command line */
if (strstr(cmd_line, "wdt=")) {
int valid_wdt = 0;
char *p, *q;
for (q = cmd_line; (p = strstr(q, "wdt=")) != 0;) {
q = p + 4;
if (p > cmd_line && p[-1] != ' ')
continue;
wdt_period = simple_strtoul(q, &q, 0);
valid_wdt = 1;
++q;
}
wdt_enable = valid_wdt;
}
#endif
/* Initialize machine-dependent vectors */
ppc_md.setup_arch = ppc4xx_setup_arch;
ppc_md.show_percpuinfo = ppc4xx_show_percpuinfo;
ppc_md.show_cpuinfo = ppc4xx_show_cpuinfo;
ppc_md.init_IRQ = ppc4xx_init_IRQ;
ppc_md.restart = ppc4xx_restart;
ppc_md.power_off = ppc4xx_power_off;
ppc_md.halt = ppc4xx_halt;
ppc_md.calibrate_decr = ppc4xx_calibrate_decr;
#ifdef CONFIG_PPC405_WDT
ppc_md.heartbeat = ppc4xx_wdt_heartbeat;
#endif
ppc_md.heartbeat_count = 0;
ppc_md.find_end_of_memory = ppc4xx_find_end_of_memory;
ppc_md.setup_io_mappings = ppc4xx_map_io;
#ifdef CONFIG_SERIAL_TEXT_DEBUG
ppc_md.progress = gen550_progress;
#endif
#if defined(CONFIG_PCI) && defined(CONFIG_IDE)
ppc_ide_md.ide_init_hwif = ppc4xx_ide_init_hwif_ports;
#endif /* defined(CONFIG_PCI) && defined(CONFIG_IDE) */
}
/* Called from MachineCheckException */
void platform_machine_check(struct pt_regs *regs)
{
#if defined(DCRN_PLB0_BEAR)
printk("PLB0: BEAR= 0x%08x ACR= 0x%08x BESR= 0x%08x\n",
mfdcr(DCRN_PLB0_BEAR), mfdcr(DCRN_PLB0_ACR),
mfdcr(DCRN_PLB0_BESR));
#endif
#if defined(DCRN_POB0_BEAR)
printk("PLB0 to OPB: BEAR= 0x%08x BESR0= 0x%08x BESR1= 0x%08x\n",
mfdcr(DCRN_POB0_BEAR), mfdcr(DCRN_POB0_BESR0),
mfdcr(DCRN_POB0_BESR1));
#endif
}
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