/* $Id: central.c,v 1.15 2001/12/19 00:29:51 davem Exp $ * central.c: Central FHC driver for Sunfire/Starfire/Wildfire. * * Copyright (C) 1997, 1999 David S. Miller (davem@redhat.com) */#include <linux/kernel.h>#include <linux/types.h>#include <linux/string.h>#include <linux/timer.h>#include <linux/sched.h>#include <linux/delay.h>#include <linux/init.h>#include <linux/bootmem.h>#include <asm/page.h>#include <asm/fhc.h>#include <asm/starfire.h>struct linux_central *central_bus = NULL;struct linux_fhc *fhc_list = NULL;#define IS_CENTRAL_FHC(__fhc)	((__fhc) == central_bus->child)static void central_probe_failure(int line){	prom_printf("CENTRAL: Critical device probe failure at central.c:%d\n",		    line);	prom_halt();}static void central_ranges_init(int cnode, struct linux_central *central){	int success;		central->num_central_ranges = 0;	success = prom_getproperty(central->prom_node, "ranges",				   (char *) central->central_ranges,				   sizeof (central->central_ranges));	if (success != -1)		central->num_central_ranges = (success/sizeof(struct linux_prom_ranges));}static void fhc_ranges_init(int fnode, struct linux_fhc *fhc){	int success;		fhc->num_fhc_ranges = 0;	success = prom_getproperty(fhc->prom_node, "ranges",				   (char *) fhc->fhc_ranges,				   sizeof (fhc->fhc_ranges));	if (success != -1)		fhc->num_fhc_ranges = (success/sizeof(struct linux_prom_ranges));}/* Range application routines are exported to various drivers, * so do not __init this. */static void adjust_regs(struct linux_prom_registers *regp, int nregs,			struct linux_prom_ranges *rangep, int nranges){	int regc, rngc;	for (regc = 0; regc < nregs; regc++) {		for (rngc = 0; rngc < nranges; rngc++)			if (regp[regc].which_io == rangep[rngc].ot_child_space)				break; /* Fount it */		if (rngc == nranges) /* oops */			central_probe_failure(__LINE__);		regp[regc].which_io = rangep[rngc].ot_parent_space;		regp[regc].phys_addr -= rangep[rngc].ot_child_base;		regp[regc].phys_addr += rangep[rngc].ot_parent_base;	}}/* Apply probed fhc ranges to registers passed, if no ranges return. */void apply_fhc_ranges(struct linux_fhc *fhc,		      struct linux_prom_registers *regs,		      int nregs){	if (fhc->num_fhc_ranges)		adjust_regs(regs, nregs, fhc->fhc_ranges,			    fhc->num_fhc_ranges);}/* Apply probed central ranges to registers passed, if no ranges return. */void apply_central_ranges(struct linux_central *central,			  struct linux_prom_registers *regs, int nregs){	if (central->num_central_ranges)		adjust_regs(regs, nregs, central->central_ranges,			    central->num_central_ranges);}void * __init central_alloc_bootmem(unsigned long size){	void *ret;	ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);	if (ret != NULL)		memset(ret, 0, size);	return ret;}static unsigned long prom_reg_to_paddr(struct linux_prom_registers *r){	unsigned long ret = ((unsigned long) r->which_io) << 32;	return ret | (unsigned long) r->phys_addr;}static void probe_other_fhcs(void){	struct linux_prom64_registers fpregs[6];	char namebuf[128];	int node;	node = prom_getchild(prom_root_node);	node = prom_searchsiblings(node, "fhc");	if (node == 0)		central_probe_failure(__LINE__);	while (node) {		struct linux_fhc *fhc;		int board;		u32 tmp;		fhc = (struct linux_fhc *)			central_alloc_bootmem(sizeof(struct linux_fhc));		if (fhc == NULL)			central_probe_failure(__LINE__);		/* Link it into the FHC chain. */		fhc->next = fhc_list;		fhc_list = fhc;		/* Toplevel FHCs have no parent. */		fhc->parent = NULL;				fhc->prom_node = node;		prom_getstring(node, "name", namebuf, sizeof(namebuf));		strcpy(fhc->prom_name, namebuf);		fhc_ranges_init(node, fhc);		/* Non-central FHC's have 64-bit OBP format registers. */		if (prom_getproperty(node, "reg",				    (char *)&fpregs[0], sizeof(fpregs)) == -1)			central_probe_failure(__LINE__);		/* Only central FHC needs special ranges applied. */		fhc->fhc_regs.pregs = fpregs[0].phys_addr;		fhc->fhc_regs.ireg = fpregs[1].phys_addr;		fhc->fhc_regs.ffregs = fpregs[2].phys_addr;		fhc->fhc_regs.sregs = fpregs[3].phys_addr;		fhc->fhc_regs.uregs = fpregs[4].phys_addr;		fhc->fhc_regs.tregs = fpregs[5].phys_addr;		board = prom_getintdefault(node, "board#", -1);		fhc->board = board;		tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_JCTRL);		if ((tmp & FHC_JTAG_CTRL_MENAB) != 0)			fhc->jtag_master = 1;		else			fhc->jtag_master = 0;		tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_ID);		printk("FHC(board %d): Version[%x] PartID[%x] Manuf[%x] %s\n",		       board,		       (tmp & FHC_ID_VERS) >> 28,		       (tmp & FHC_ID_PARTID) >> 12,		       (tmp & FHC_ID_MANUF) >> 1,		       (fhc->jtag_master ? "(JTAG Master)" : ""));				/* This bit must be set in all non-central FHC's in		 * the system.  When it is clear, this identifies		 * the central board.		 */		tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);		tmp |= FHC_CONTROL_IXIST;		upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);		/* Look for the next FHC. */		node = prom_getsibling(node);		if (node == 0)			break;		node = prom_searchsiblings(node, "fhc");		if (node == 0)			break;	}}static void probe_clock_board(struct linux_central *central,			      struct linux_fhc *fhc,			      int cnode, int fnode){	struct linux_prom_registers cregs[3];	int clknode, nslots, tmp, nregs;	clknode = prom_searchsiblings(prom_getchild(fnode), "clock-board");	if (clknode == 0 || clknode == -1)		central_probe_failure(__LINE__);	nregs = prom_getproperty(clknode, "reg", (char *)&cregs[0], sizeof(cregs));	if (nregs == -1)		central_probe_failure(__LINE__);	nregs /= sizeof(struct linux_prom_registers);	apply_fhc_ranges(fhc, &cregs[0], nregs);	apply_central_ranges(central, &cregs[0], nregs);	central->cfreg = prom_reg_to_paddr(&cregs[0]);	central->clkregs = prom_reg_to_paddr(&cregs[1]);	if (nregs == 2)		central->clkver = 0UL;	else		central->clkver = prom_reg_to_paddr(&cregs[2]);	tmp = upa_readb(central->clkregs + CLOCK_STAT1);	tmp &= 0xc0;	switch(tmp) {	case 0x40:		nslots = 16;		break;	case 0xc0:		nslots = 8;		break;	case 0x80:		if (central->clkver != 0UL &&		   upa_readb(central->clkver) != 0) {			if ((upa_readb(central->clkver) & 0x80) != 0)				nslots = 4;			else				nslots = 5;			break;		}	default:		nslots = 4;		break;	};	central->slots = nslots;	printk("CENTRAL: Detected %d slot Enterprise system. cfreg[%02x] cver[%02x]\n",	       central->slots, upa_readb(central->cfreg),	       (central->clkver ? upa_readb(central->clkver) : 0x00));}static void ZAP(unsigned long iclr, unsigned long imap){	u32 imap_tmp;	upa_writel(0, iclr);	upa_readl(iclr);	imap_tmp = upa_readl(imap);	imap_tmp &= ~(0x80000000);	upa_writel(imap_tmp, imap);	upa_readl(imap);}static void init_all_fhc_hw(void){	struct linux_fhc *fhc;	for (fhc = fhc_list; fhc != NULL; fhc = fhc->next) {		u32 tmp;		/* Clear all of the interrupt mapping registers		 * just in case OBP left them in a foul state.		 */		ZAP(fhc->fhc_regs.ffregs + FHC_FFREGS_ICLR,		    fhc->fhc_regs.ffregs + FHC_FFREGS_IMAP);		ZAP(fhc->fhc_regs.sregs + FHC_SREGS_ICLR,		    fhc->fhc_regs.sregs + FHC_SREGS_IMAP);		ZAP(fhc->fhc_regs.uregs + FHC_UREGS_ICLR,		    fhc->fhc_regs.uregs + FHC_UREGS_IMAP);		ZAP(fhc->fhc_regs.tregs + FHC_TREGS_ICLR,		    fhc->fhc_regs.tregs + FHC_TREGS_IMAP);		/* Setup FHC control register. */		tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);		/* All non-central boards have this bit set. */		if (! IS_CENTRAL_FHC(fhc))			tmp |= FHC_CONTROL_IXIST;		/* For all FHCs, clear the firmware synchronization		 * line and both low power mode enables.		 */		tmp &= ~(FHC_CONTROL_AOFF | FHC_CONTROL_BOFF |			 FHC_CONTROL_SLINE);		upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);		upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);	}}void central_probe(void){	struct linux_prom_registers fpregs[6];	struct linux_fhc *fhc;	char namebuf[128];	int cnode, fnode, err;	cnode = prom_finddevice("/central");	if (cnode == 0 || cnode == -1) {		if (this_is_starfire)			starfire_cpu_setup();		return;	}	/* Ok we got one, grab some memory for software state. */	central_bus = (struct linux_central *)		central_alloc_bootmem(sizeof(struct linux_central));	if (central_bus == NULL)		central_probe_failure(__LINE__);	fhc = (struct linux_fhc *)		central_alloc_bootmem(sizeof(struct linux_fhc));	if (fhc == NULL)		central_probe_failure(__LINE__);	/* First init central. */	central_bus->child = fhc;	central_bus->prom_node = cnode;	prom_getstring(cnode, "name", namebuf, sizeof(namebuf));	strcpy(central_bus->prom_name, namebuf);	central_ranges_init(cnode, central_bus);	/* And then central's FHC. */	fhc->next = fhc_list;	fhc_list = fhc;	fhc->parent = central_bus;	fnode = prom_searchsiblings(prom_getchild(cnode), "fhc");	if (fnode == 0 || fnode == -1)		central_probe_failure(__LINE__);	fhc->prom_node = fnode;	prom_getstring(fnode, "name", namebuf, sizeof(namebuf));	strcpy(fhc->prom_name, namebuf);	fhc_ranges_init(fnode, fhc);	/* Now, map in FHC register set. */	if (prom_getproperty(fnode, "reg", (char *)&fpregs[0], sizeof(fpregs)) == -1)		central_probe_failure(__LINE__);	apply_central_ranges(central_bus, &fpregs[0], 6);		fhc->fhc_regs.pregs = prom_reg_to_paddr(&fpregs[0]);	fhc->fhc_regs.ireg = prom_reg_to_paddr(&fpregs[1]);	fhc->fhc_regs.ffregs = prom_reg_to_paddr(&fpregs[2]);	fhc->fhc_regs.sregs = prom_reg_to_paddr(&fpregs[3]);	fhc->fhc_regs.uregs = prom_reg_to_paddr(&fpregs[4]);	fhc->fhc_regs.tregs = prom_reg_to_paddr(&fpregs[5]);	/* Obtain board number from board status register, Central's	 * FHC lacks "board#" property.	 */	err = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_BSR);	fhc->board = (((err >> 16) & 0x01) |		      ((err >> 12) & 0x0e));	fhc->jtag_master = 0;	/* Attach the clock board registers for CENTRAL. */	probe_clock_board(central_bus, fhc, cnode, fnode);	err = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_ID);	printk("FHC(board %d): Version[%x] PartID[%x] Manuf[%x] (CENTRAL)\n",	       fhc->board,	       ((err & FHC_ID_VERS) >> 28),	       ((err & FHC_ID_PARTID) >> 12),	       ((err & FHC_ID_MANUF) >> 1));	probe_other_fhcs();	init_all_fhc_hw();}static __inline__ void fhc_ledblink(struct linux_fhc *fhc, int on){	u32 tmp;	tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);	/* NOTE: reverse logic on this bit */	if (on)		tmp &= ~(FHC_CONTROL_RLED);	else		tmp |= FHC_CONTROL_RLED;	tmp &= ~(FHC_CONTROL_AOFF | FHC_CONTROL_BOFF | FHC_CONTROL_SLINE);	upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);	upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);}static __inline__ void central_ledblink(struct linux_central *central, int on){	u8 tmp;	tmp = upa_readb(central->clkregs + CLOCK_CTRL);	/* NOTE: reverse logic on this bit */	if (on)		tmp &= ~(CLOCK_CTRL_RLED);	else		tmp |= CLOCK_CTRL_RLED;	upa_writeb(tmp, central->clkregs + CLOCK_CTRL);	upa_readb(central->clkregs + CLOCK_CTRL);}static struct timer_list sftimer;static int led_state;static void sunfire_timer(unsigned long __ignored){	struct linux_fhc *fhc;	central_ledblink(central_bus, led_state);	for (fhc = fhc_list; fhc != NULL; fhc = fhc->next)		if (! IS_CENTRAL_FHC(fhc))			fhc_ledblink(fhc, led_state);	led_state = ! led_state;	sftimer.expires = jiffies + (HZ >> 1);	add_timer(&sftimer);}/* After PCI/SBUS busses have been probed, this is called to perform * final initialization of all FireHose Controllers in the system. */void firetruck_init(void){	struct linux_central *central = central_bus;	u8 ctrl;	/* No central bus, nothing to do. */	if (central == NULL)		return;	/* OBP leaves it on, turn it off so clock board timer LED	 * is in sync with FHC ones.	 */	ctrl = upa_readb(central->clkregs + CLOCK_CTRL);	ctrl &= ~(CLOCK_CTRL_RLED);	upa_writeb(ctrl, central->clkregs + CLOCK_CTRL);	led_state = 0;	init_timer(&sftimer);	sftimer.data = 0;	sftimer.function = &sunfire_timer;	sftimer.expires = jiffies + (HZ >> 1);	add_timer(&sftimer);}