patch-2.4.20 linux-2.4.20/arch/parisc/kernel/processor.c

• Lines: 375
• Date: Thu Nov 28 15:53:10 2002
• Orig file: linux-2.4.19/arch/parisc/kernel/processor.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/parisc/kernel/processor.c linux-2.4.20/arch/parisc/kernel/processor.c
@@ -0,0 +1,374 @@
+/*    $Id: processor.c,v 1.13 2002/07/04 19:33:01 grundler Exp $
+ *
+ *    Initial setup-routines for HP 9000 based hardware.
+ *
+ *    Copyright (C) 1991, 1992, 1995  Linus Torvalds
+ *    Modifications for PA-RISC (C) 1999 Helge Deller <deller@gmx.de>
+ *    Modifications copyright 1999 SuSE GmbH (Philipp Rumpf)
+ *    Modifications copyright 2000 Martin K. Petersen <mkp@mkp.net>
+ *    Modifications copyright 2000 Philipp Rumpf <prumpf@tux.org>
+ *    Modifications copyright 2001 Ryan Bradetich <rbradetich@uswest.net>
+ *
+ *    Initial PA-RISC Version: 04-23-1999 by Helge Deller
+ *
+ *    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, or (at your option)
+ *    any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#define PCI_DEBUG
+#include <linux/pci.h>
+#undef PCI_DEBUG
+
+#include <asm/cache.h>
+#include <asm/hardware.h>	/* for register_parisc_driver() stuff */
+#include <asm/processor.h>
+#include <asm/page.h>
+#include <asm/pdc.h>
+#include <asm/irq.h>		/* for struct irq_region */
+
+struct system_cpuinfo_parisc boot_cpu_data;
+struct cpuinfo_parisc cpu_data[NR_CPUS];
+
+/*
+**  	PARISC CPU driver - claim "device" and initialize CPU data structures.
+**
+** Consolidate per CPU initialization into (mostly) one module.
+** Monarch CPU will initialize boot_cpu_data which shouldn't
+** change once the system has booted.
+**
+** The callback *should* do per-instance initialization of
+** everything including the monarch. "Per CPU" init code in
+** setup.c:start_parisc() has migrated here and start_parisc()
+** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
+**
+** The goal of consolidating CPU initialization into one place is
+** to make sure all CPU's get initialized the same way.
+** The code path not shared is how PDC hands control of the CPU to the OS.
+** The initialization of OS data structures is the same (done below).
+*/
+
+/**
+ * processor_probe - Determine if processor driver should claim this device.
+ * @dev: The device which has been found.
+ *
+ * Determine if processor driver should claim this chip (return 0) or not 
+ * (return 1).  If so, initialize the chip and tell other partners in crime 
+ * they have work to do.
+ */
+static int __init processor_probe(struct parisc_device *dev)
+{
+	unsigned long txn_addr;
+	unsigned long cpuid;
+	struct cpuinfo_parisc *p;
+
+#ifndef CONFIG_SMP
+	if (boot_cpu_data.cpu_count > 0) {
+		printk(KERN_INFO "CONFIG_SMP=n  ignoring additional CPUs\n");
+		return 1;
+	}
+#endif
+
+	/* logical CPU ID and update global counter
+	 * May get overwritten by PAT code.
+	 */
+	cpuid = boot_cpu_data.cpu_count;
+	txn_addr = dev->hpa;	/* for legacy PDC */
+
+#ifdef __LP64__
+	if (is_pdc_pat()) {
+		ulong status;
+		unsigned long bytecnt;
+	        pdc_pat_cell_mod_maddr_block_t pa_pdc_cell;
+#undef USE_PAT_CPUID
+#ifdef USE_PAT_CPUID
+		struct pdc_pat_cpu_num cpu_info;
+#endif
+
+		status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
+			dev->mod_index, PA_VIEW, &pa_pdc_cell);
+
+		ASSERT(PDC_OK == status);
+
+		/* verify it's the same as what do_pat_inventory() found */
+		ASSERT(dev->mod_info == pa_pdc_cell.mod_info);
+		ASSERT(dev->pmod_loc == pa_pdc_cell.mod_location);
+
+		txn_addr = pa_pdc_cell.mod[0];   /* id_eid for IO sapic */
+
+#ifdef USE_PAT_CPUID
+/* We need contiguous numbers for cpuid. Firmware's notion
+ * of cpuid is for physical CPUs and we just don't care yet.
+ * We'll care when we need to query PAT PDC about a CPU *after*
+ * boot time (ie shutdown a CPU from an OS perspective).
+ */
+		/* get the cpu number */
+		status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa);
+
+		ASSERT(PDC_OK == status);
+
+		if (cpu_info.cpu_num >= NR_CPUS) {
+			printk(KERN_WARNING "IGNORING CPU at 0x%x,"
+				" cpu_slot_id > NR_CPUS"
+				" (%ld > %d)\n",
+				dev->hpa, cpu_info.cpu_num, NR_CPUS);
+			/* Ignore CPU since it will only crash */
+			boot_cpu_data.cpu_count--;
+			return 1;
+		} else {
+			cpuid = cpu_info.cpu_num;
+		}
+#endif
+	}
+#endif
+
+	p = &cpu_data[cpuid];
+	boot_cpu_data.cpu_count++;
+
+	/* initialize counters */
+	memset(p, 0, sizeof(struct cpuinfo_parisc));
+
+	p->dev = dev;		/* Save IODC data in case we need it */
+	p->hpa = dev->hpa;	/* save CPU hpa */
+	p->cpuid = cpuid;	/* save CPU id */
+	p->txn_addr = txn_addr;	/* save CPU IRQ address */
+#ifdef CONFIG_SMP
+	p->lock = SPIN_LOCK_UNLOCKED;
+
+	/*
+	** FIXME: review if any other initialization is clobbered
+	**	for boot_cpu by the above memset().
+	*/
+
+	/* stolen from init_percpu_prof() */
+	cpu_data[cpuid].prof_counter = 1;
+	cpu_data[cpuid].prof_multiplier = 1;
+#endif
+
+	/*
+	** CONFIG_SMP: init_smp_config() will attempt to get CPU's into
+	** OS control. RENDEZVOUS is the default state - see mem_set above.
+	**	p->state = STATE_RENDEZVOUS;
+	*/
+
+	/*
+	** itimer and ipi IRQ handlers are statically initialized in
+	** arch/parisc/kernel/irq.c. ie Don't need to register them.
+	*/
+	p->region = irq_region[IRQ_FROM_REGION(CPU_IRQ_REGION)];
+
+	return 0;
+}
+
+/**
+ * collect_boot_cpu_data - Fill the boot_cpu_data structure.
+ *
+ * This function collects and stores the generic processor information
+ * in the boot_cpu_data structure.
+ */
+void __init collect_boot_cpu_data(void)
+{
+	memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
+
+	boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
+
+	/* get CPU-Model Information... */
+#define p ((unsigned long *)&boot_cpu_data.pdc.model)
+	if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK)
+		printk(KERN_INFO 
+			"model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
+			p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
+#undef p
+
+	if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK)
+		printk(KERN_INFO "vers  %08lx\n", 
+			boot_cpu_data.pdc.versions);
+
+	if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK)
+		printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
+			(boot_cpu_data.pdc.cpuid >> 5) & 127,
+			boot_cpu_data.pdc.cpuid & 31,
+			boot_cpu_data.pdc.cpuid);
+
+	if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
+		printk(KERN_INFO "capabilities 0x%lx\n",
+			boot_cpu_data.pdc.capabilities);
+
+	if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
+		printk(KERN_INFO "model %s\n",
+			boot_cpu_data.pdc.sys_model_name);
+
+	boot_cpu_data.hversion =  boot_cpu_data.pdc.model.hversion;
+	boot_cpu_data.sversion =  boot_cpu_data.pdc.model.sversion;
+
+	boot_cpu_data.cpu_type =
+			parisc_get_cpu_type(boot_cpu_data.hversion);
+
+	boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
+	boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
+}
+
+
+/**
+ * init_cpu_profiler - enable/setup per cpu profiling hooks.
+ * @cpunum: The processor instance.
+ *
+ * FIXME: doesn't do much yet...
+ */
+static inline void __init
+init_percpu_prof(int cpunum)
+{
+	cpu_data[cpunum].prof_counter = 1;
+	cpu_data[cpunum].prof_multiplier = 1;
+}
+
+
+/**
+ * init_per_cpu - Handle individual processor initializations.
+ * @cpunum: logical processor number.
+ *
+ * This function handles initialization for *every* CPU
+ * in the system:
+ *
+ * o Set "default" CPU width for trap handlers
+ *
+ * o Enable FP coprocessor
+ *   REVISIT: this could be done in the "code 22" trap handler.
+ *	(frowands idea - that way we know which processes need FP
+ *	registers saved on the interrupt stack.)
+ *   NEWS FLASH: wide kernels need FP coprocessor enabled to handle
+ *	formatted printing of %lx for example (double divides I think)
+ *
+ * o Enable CPU profiling hooks.
+ */
+int __init init_per_cpu(int cpunum)
+{
+	int ret;
+	struct pdc_coproc_cfg coproc_cfg;
+
+	ret = pdc_coproc_cfg(&coproc_cfg);
+
+	if(ret >= 0 && coproc_cfg.ccr_functional) {
+		mtctl(coproc_cfg.ccr_functional, 10);  /* 10 == Coprocessor Control Reg */
+
+		/* FWIW, FP rev/model is a more accurate way to determine
+		** CPU type. CPU rev/model has some ambiguous cases.
+		*/
+		cpu_data[cpunum].fp_rev = coproc_cfg.revision;
+		cpu_data[cpunum].fp_model = coproc_cfg.model;
+
+		printk(KERN_INFO  "FP[%d] enabled: Rev %ld Model %ld\n",
+			cpunum, coproc_cfg.revision, coproc_cfg.model);
+
+		/*
+		** store status register to stack (hopefully aligned)
+		** and clear the T-bit.
+		*/
+		asm volatile ("fstd    %fr0,8(%sp)");
+
+	} else {
+		printk(KERN_WARNING  "WARNING: No FP CoProcessor?!"
+			" (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
+#ifdef __LP64__
+			"Halting Machine - FP required\n"
+#endif
+			, coproc_cfg.ccr_functional);
+#ifdef __LP64__
+		mdelay(100);	/* previous chars get pushed to console */
+		panic("FP CoProc not reported");
+#endif
+	}
+
+	/* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
+	init_percpu_prof(cpunum);
+
+	return ret;
+}
+
+/*
+ * Display cpu info for all cpu's.
+ */
+int
+show_cpuinfo (struct seq_file *m, void *v)
+{
+	int	n;
+
+	for(n=0; n<boot_cpu_data.cpu_count; n++) {
+#ifdef CONFIG_SMP
+		if (0 == cpu_data[n].hpa)
+			continue;
+#ifdef ENTRY_SYS_CPUS
+#error iCOD support wants to show CPU state here
+#endif
+#endif
+		seq_printf(m, "processor\t: %d\n"
+				"cpu family\t: PA-RISC %s\n",
+				 n, boot_cpu_data.family_name);
+
+		seq_printf(m, "cpu\t\t: %s\n",  boot_cpu_data.cpu_name );
+
+		/* cpu MHz */
+		seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
+				 boot_cpu_data.cpu_hz / 1000000,
+				 boot_cpu_data.cpu_hz % 1000000  );
+
+		seq_printf(m, "model\t\t: %s\n"
+				"model name\t: %s\n",
+				 boot_cpu_data.pdc.sys_model_name,
+				 cpu_data[n].dev ? 
+				 cpu_data[n].dev->name : "Unknown" );
+
+		seq_printf(m, "hversion\t: 0x%08x\n"
+			        "sversion\t: 0x%08x\n",
+				 boot_cpu_data.hversion,
+				 boot_cpu_data.sversion );
+
+		/* print cachesize info */
+		show_cache_info(m);
+
+		seq_printf(m, "bogomips\t: %lu.%02lu\n",
+			     loops_per_jiffy / (500000 / HZ),
+			     (loops_per_jiffy / (5000 / HZ)) % 100);
+
+		seq_printf(m, "software id\t: %ld\n\n",
+				boot_cpu_data.pdc.model.sw_id);
+	}
+	return 0;
+}
+
+static struct parisc_device_id processor_tbl[] = {
+	{ HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
+	{ 0, }
+};
+
+static struct parisc_driver cpu_driver = {
+	name:		"CPU",
+	id_table:	processor_tbl,
+	probe:		processor_probe
+};
+
+/**
+ * processor_init - Processor initalization procedure.
+ *
+ * Register this driver.
+ */
+void __init processor_init(void)
+{
+	register_parisc_driver(&cpu_driver);
+}