pmac_setup.c

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/*
 *  linux/arch/ppc/kernel/setup.c
 *
 *  PowerPC version 
 *    Copyright (C) 1995-1996 Gary Thomas ([e-mail])
 *
 *  Adapted for Power Macintosh by Paul Mackerras
 *    Copyright (C) 1996 Paul Mackerras ([e-mail])
 *
 *  Derived from "arch/alpha/kernel/setup.c"
 *    Copyright (C) 1995 Linus Torvalds
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

/*
 * bootup setup stuff..
 */

#include <linux/config.h>
#include <linux/init.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/malloc.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/blk.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <linux/ide.h>
#include <linux/pci.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/pmu.h>

#include <asm/init.h>
#include <asm/prom.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/ohare.h>
#include <asm/mediabay.h>
#include <asm/feature.h>
#include <asm/machdep.h>
#include <asm/keyboard.h>
#include <asm/dma.h>
#include <asm/bootx.h>

#include <asm/time.h>
#include "local_irq.h"
#include "pmac_pic.h"

#undef SHOW_GATWICK_IRQS

extern long pmac_time_init(void);
extern unsigned long pmac_get_rtc_time(void);
extern int pmac_set_rtc_time(unsigned long nowtime);
extern void pmac_read_rtc_time(void);
extern void pmac_calibrate_decr(void);
extern void pmac_setup_pci_ptrs(void);

extern int mackbd_setkeycode(unsigned int scancode, unsigned int keycode);
extern int mackbd_getkeycode(unsigned int scancode);
extern int mackbd_translate(unsigned char keycode, unsigned char *keycodep,
		     char raw_mode);
extern int mackbd_unexpected_up(unsigned char keycode);
extern void mackbd_leds(unsigned char leds);
extern void __init mackbd_init_hw(void);
extern int mac_hid_kbd_translate(unsigned char scancode, unsigned char *keycode,
				 char raw_mode);
extern char mac_hid_kbd_unexpected_up(unsigned char keycode);
extern void mac_hid_init_hw(void);
#ifdef CONFIG_MAGIC_SYSRQ
extern unsigned char mac_hid_kbd_sysrq_xlate[128];
extern unsigned char pckbd_sysrq_xlate[128];
extern unsigned char mackbd_sysrq_xlate[128];
#endif /* CONFIG_MAGIC_SYSRQ */
extern int pckbd_setkeycode(unsigned int scancode, unsigned int keycode);
extern int pckbd_getkeycode(unsigned int scancode);
extern int pckbd_translate(unsigned char scancode, unsigned char *keycode,
			   char raw_mode);
extern char pckbd_unexpected_up(unsigned char keycode);
extern int keyboard_sends_linux_keycodes;
extern void pmac_nvram_update(void);

extern void *pmac_pci_dev_io_base(unsigned char bus, unsigned char devfn, int physical);
extern void *pmac_pci_dev_mem_base(unsigned char bus, unsigned char devfn);
extern int pmac_pci_dev_root_bridge(unsigned char bus, unsigned char devfn);

unsigned char drive_info;

int ppc_override_l2cr = 0;
int ppc_override_l2cr_value;
int has_l2cache = 0;

static int current_root_goodness = -1;

extern char saved_command_line[];

extern int pmac_newworld;

#define DEFAULT_ROOT_DEVICE 0x0801	/* sda1 - slightly silly choice */

extern void zs_kgdb_hook(int tty_num);
static void ohare_init(void);
static void init_p2pbridge(void);
#ifdef CONFIG_BOOTX_TEXT
void pmac_progress(char *s, unsigned short hex);
#endif

sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;

__pmac
int
pmac_get_cpuinfo(char *buffer)
{
	int len;
	struct device_node *np;
	char *pp;
	int plen;

	/* find motherboard type */
	len = sprintf(buffer, "machine\t\t: ");
	np = find_devices("device-tree");
	if (np != NULL) {
		pp = (char *) get_property(np, "model", NULL);
		if (pp != NULL)
			len += sprintf(buffer+len, "%s\n", pp);
		else
			len += sprintf(buffer+len, "PowerMac\n");
		pp = (char *) get_property(np, "compatible", &plen);
		if (pp != NULL) {
			len += sprintf(buffer+len, "motherboard\t:");
			while (plen > 0) {
				int l = strlen(pp) + 1;
				len += sprintf(buffer+len, " %s", pp);
				plen -= l;
				pp += l;
			}
			buffer[len++] = '\n';
		}
	} else
		len += sprintf(buffer+len, "PowerMac\n");

	/* find l2 cache info */
	np = find_devices("l2-cache");
	if (np == 0)
		np = find_type_devices("cache");
	if (np != 0) {
		unsigned int *ic = (unsigned int *)
			get_property(np, "i-cache-size", NULL);
		unsigned int *dc = (unsigned int *)
			get_property(np, "d-cache-size", NULL);
		len += sprintf(buffer+len, "L2 cache\t:");
		has_l2cache = 1;
		if (get_property(np, "cache-unified", NULL) != 0 && dc) {
			len += sprintf(buffer+len, " %dK unified", *dc / 1024);
		} else {
			if (ic)
				len += sprintf(buffer+len, " %dK instruction",
					       *ic / 1024);
			if (dc)
				len += sprintf(buffer+len, "%s %dK data",
					       (ic? " +": ""), *dc / 1024);
		}
		pp = get_property(np, "ram-type", NULL);
		if (pp)
			len += sprintf(buffer+len, " %s", pp);
		buffer[len++] = '\n';
	}

	/* find ram info */
	np = find_devices("memory");
	if (np != 0) {
		int n;
		struct reg_property *reg = (struct reg_property *)
			get_property(np, "reg", &n);
		
		if (reg != 0) {
			unsigned long total = 0;

			for (n /= sizeof(struct reg_property); n > 0; --n)
				total += (reg++)->size;
			len += sprintf(buffer+len, "memory\t\t: %luMB\n",
				       total >> 20);
		}
	}

	/* Checks "l2cr-value" property in the registry */
	np = find_devices("cpus");		
	if (np == 0)
		np = find_type_devices("cpu");		
	if (np != 0) {
		unsigned int *l2cr = (unsigned int *)
			get_property(np, "l2cr-value", NULL);
		if (l2cr != 0) {
			len += sprintf(buffer+len, "l2cr override\t: 0x%x\n", *l2cr);
		}
	}
	
	/* Indicate newworld/oldworld */
	len += sprintf(buffer+len, "pmac-generation\t: %s\n",
		pmac_newworld ? "NewWorld" : "OldWorld");		
	

	return len;
}

#ifdef CONFIG_SCSI
/* Find the device number for the disk (if any) at target tgt
   on host adaptor host.  We just need to get the prototype from
   sd.h */
#include <linux/blkdev.h>
#include "../../../drivers/scsi/scsi.h"
#include "../../../drivers/scsi/sd.h"

#endif

/*
 * Dummy mksound function that does nothing.
 * The real one is in the dmasound driver.
 */
__pmac
static void
pmac_mksound(unsigned int hz, unsigned int ticks)
{
}

static volatile u32 *sysctrl_regs;

void __init
pmac_setup_arch(void)
{
	struct device_node *cpu;
	int *fp;

	/* Set loops_per_sec to a half-way reasonable value,
	   for use until calibrate_delay gets called. */
	cpu = find_type_devices("cpu");
	if (cpu != 0) {
		fp = (int *) get_property(cpu, "clock-frequency", NULL);
		if (fp != 0) {
			switch (_get_PVR() >> 16) {
			case 4:		/* 604 */
			case 8:		/* G3 */
			case 9:		/* 604e */
			case 10:	/* mach V (604ev5) */
			case 12:	/* G4 */
			case 20:	/* 620 */
				loops_per_sec = *fp;
				break;
			default:	/* 601, 603, etc. */
				loops_per_sec = *fp / 2;
			}
		} else
			loops_per_sec = 50000000;
	}

	/* this area has the CPU identification register
	   and some registers used by smp boards */
	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
	__ioremap(0xffc00000, 0x400000, pgprot_val(PAGE_READONLY));
	ohare_init();

	pmac_find_bridges();
	init_p2pbridge();
	
	/* Checks "l2cr-value" property in the registry */
	if ( (_get_PVR() >> 16) == 8 || (_get_PVR() >> 16) == 12 ) {
		struct device_node *np = find_devices("cpus");		
		if (np == 0)
			np = find_type_devices("cpu");		
		if (np != 0) {
			unsigned int *l2cr = (unsigned int *)
				get_property(np, "l2cr-value", NULL);
			if (l2cr != 0) {
				ppc_override_l2cr = 1;
				ppc_override_l2cr_value = *l2cr;
				_set_L2CR(0);
				_set_L2CR(ppc_override_l2cr_value);
			}
		}
	}

	if (ppc_override_l2cr)
		printk(KERN_INFO "L2CR overriden (0x%x), backside cache is %s\n",
			ppc_override_l2cr_value, (ppc_override_l2cr_value & 0x80000000)
				? "enabled" : "disabled");

#ifdef CONFIG_KGDB
	zs_kgdb_hook(0);
#endif

#ifdef CONFIG_ADB_CUDA
	find_via_cuda();
#endif	
#ifdef CONFIG_ADB_PMU
	find_via_pmu();
#endif	
#ifdef CONFIG_NVRAM
	pmac_nvram_init();
#endif
#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
#endif

	kd_mksound = pmac_mksound;

#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start)
		ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
	else
#endif
		ROOT_DEV = to_kdev_t(DEFAULT_ROOT_DEVICE);
}

/*
 * Tweak the PCI-PCI bridge chip on the blue & white G3s.
 */
static void __init init_p2pbridge(void)
{
	struct device_node *p2pbridge;
	unsigned char bus, devfn;
	unsigned short val;

	/* XXX it would be better here to identify the specific
	   PCI-PCI bridge chip we have. */
	if ((p2pbridge = find_devices("pci-bridge")) == 0
	    || p2pbridge->parent == NULL
	    || strcmp(p2pbridge->parent->name, "pci") != 0)
		return;
	if (pci_device_loc(p2pbridge, &bus, &devfn) < 0)
		return;
	if (ppc_md.pcibios_read_config_word(bus, devfn, PCI_BRIDGE_CONTROL, &val) < 0) {
		printk(KERN_ERR "init_p2pbridge: couldn't read bridge control\n");
		return;
	}
	val &= ~PCI_BRIDGE_CTL_MASTER_ABORT;
	ppc_md.pcibios_write_config_word(bus, devfn, PCI_BRIDGE_CONTROL, val);
	ppc_md.pcibios_read_config_word(bus, devfn, PCI_BRIDGE_CONTROL, &val);
}

static void __init ohare_init(void)
{
	/*
	 * Turn on the L2 cache.
	 * We assume that we have a PSX memory controller iff
	 * we have an ohare I/O controller.
	 */
	if (find_devices("ohare") != NULL) {