1 files changed, 457 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/central.c b/arch/sparc64/kernel/central.c
new file mode 100644
index 0000000..3d184a7
--- /dev/null
+++ b/arch/sparc64/kernel/central.c
@@ -0,0 +1,457 @@
+/* $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);
+}