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-rw-r--r--arch/parisc/kernel/processor.c470
1 files changed, 470 insertions, 0 deletions
diff --git a/arch/parisc/kernel/processor.c b/arch/parisc/kernel/processor.c
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+++ b/arch/parisc/kernel/processor.c
@@ -0,0 +1,470 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Initial setup-routines for HP 9000 based hardware.
+ *
+ * Copyright (C) 1991, 1992, 1995 Linus Torvalds
+ * Modifications for PA-RISC (C) 1999-2008 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
+ */
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/cpu.h>
+#include <asm/param.h>
+#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/pdcpat.h>
+#include <asm/irq.h> /* for struct irq_region */
+#include <asm/parisc-device.h>
+
+struct system_cpuinfo_parisc boot_cpu_data __ro_after_init;
+EXPORT_SYMBOL(boot_cpu_data);
+#ifdef CONFIG_PA8X00
+int _parisc_requires_coherency __ro_after_init;
+EXPORT_SYMBOL(_parisc_requires_coherency);
+#endif
+
+DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
+
+/*
+** 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 CPUs 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).
+*/
+
+/**
+ * init_cpu_profiler - enable/setup per cpu profiling hooks.
+ * @cpunum: The processor instance.
+ *
+ * FIXME: doesn't do much yet...
+ */
+static void
+init_percpu_prof(unsigned long cpunum)
+{
+}
+
+
+/**
+ * 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;
+ struct pdc_pat_cpu_num cpu_info = { };
+
+#ifdef CONFIG_SMP
+ if (num_online_cpus() >= nr_cpu_ids) {
+ printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n");
+ return 1;
+ }
+#else
+ 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.start; /* for legacy PDC */
+ cpu_info.cpu_num = cpu_info.cpu_loc = cpuid;
+
+#ifdef CONFIG_64BIT
+ if (is_pdc_pat()) {
+ ulong status;
+ unsigned long bytecnt;
+ pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;
+
+ pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
+ if (!pa_pdc_cell)
+ panic("couldn't allocate memory for PDC_PAT_CELL!");
+
+ status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
+ dev->mod_index, PA_VIEW, pa_pdc_cell);
+
+ BUG_ON(PDC_OK != status);
+
+ /* verify it's the same as what do_pat_inventory() found */
+ BUG_ON(dev->mod_info != pa_pdc_cell->mod_info);
+ BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location);
+
+ txn_addr = pa_pdc_cell->mod[0]; /* id_eid for IO sapic */
+
+ kfree(pa_pdc_cell);
+
+ /* get the cpu number */
+ status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
+ BUG_ON(PDC_OK != status);
+
+ pr_info("Logical CPU #%lu is physical cpu #%lu at location "
+ "0x%lx with hpa %pa\n",
+ cpuid, cpu_info.cpu_num, cpu_info.cpu_loc,
+ &dev->hpa.start);
+
+#undef USE_PAT_CPUID
+#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).
+ */
+ if (cpu_info.cpu_num >= NR_CPUS) {
+ printk(KERN_WARNING "IGNORING CPU at %pa,"
+ " cpu_slot_id > NR_CPUS"
+ " (%ld > %d)\n",
+ &dev->hpa.start, 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 = &per_cpu(cpu_data, cpuid);
+ boot_cpu_data.cpu_count++;
+
+ /* initialize counters - CPU 0 gets it_value set in time_init() */
+ if (cpuid)
+ memset(p, 0, sizeof(struct cpuinfo_parisc));
+
+ p->dev = dev; /* Save IODC data in case we need it */
+ p->hpa = dev->hpa.start; /* save CPU hpa */
+ p->cpuid = cpuid; /* save CPU id */
+ p->txn_addr = txn_addr; /* save CPU IRQ address */
+ p->cpu_num = cpu_info.cpu_num;
+ p->cpu_loc = cpu_info.cpu_loc;
+
+ store_cpu_topology(cpuid);
+
+#ifdef CONFIG_SMP
+ /*
+ ** FIXME: review if any other initialization is clobbered
+ ** for boot_cpu by the above memset().
+ */
+ init_percpu_prof(cpuid);
+#endif
+
+ /*
+ ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
+ ** OS control. RENDEZVOUS is the default state - see mem_set above.
+ ** p->state = STATE_RENDEZVOUS;
+ */
+
+#if 0
+ /* CPU 0 IRQ table is statically allocated/initialized */
+ if (cpuid) {
+ struct irqaction actions[];
+
+ /*
+ ** itimer and ipi IRQ handlers are statically initialized in
+ ** arch/parisc/kernel/irq.c. ie Don't need to register them.
+ */
+ actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
+ if (!actions) {
+ /* not getting it's own table, share with monarch */
+ actions = cpu_irq_actions[0];
+ }
+
+ cpu_irq_actions[cpuid] = actions;
+ }
+#endif
+
+ /*
+ * Bring this CPU up now! (ignore bootstrap cpuid == 0)
+ */
+#ifdef CONFIG_SMP
+ if (cpuid) {
+ set_cpu_present(cpuid, true);
+ add_cpu(cpuid);
+ }
+#endif
+
+ 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)
+{
+ unsigned long cr16_seed;
+ char orig_prod_num[64], current_prod_num[64], serial_no[64];
+
+ memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
+
+ cr16_seed = get_cycles();
+ add_device_randomness(&cr16_seed, sizeof(cr16_seed));
+
+ 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]);
+
+ add_device_randomness(&boot_cpu_data.pdc.model,
+ sizeof(boot_cpu_data.pdc.model));
+ }
+#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);
+
+ add_device_randomness(&boot_cpu_data.pdc.versions,
+ sizeof(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);
+
+ add_device_randomness(&boot_cpu_data.pdc.cpuid,
+ sizeof(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);
+
+ dump_stack_set_arch_desc("%s", 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];
+
+#ifdef CONFIG_PA8X00
+ _parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) ||
+ (boot_cpu_data.cpu_type == mako2);
+#endif
+
+ if (pdc_model_platform_info(orig_prod_num, current_prod_num, serial_no) == PDC_OK) {
+ printk(KERN_INFO "product %s, original product %s, S/N: %s\n",
+ current_prod_num[0] ? current_prod_num : "n/a",
+ orig_prod_num, serial_no);
+ add_device_randomness(orig_prod_num, strlen(orig_prod_num));
+ add_device_randomness(current_prod_num, strlen(current_prod_num));
+ add_device_randomness(serial_no, strlen(serial_no));
+ }
+}
+
+
+/**
+ * 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;
+
+ set_firmware_width();
+ ret = pdc_coproc_cfg(&coproc_cfg);
+
+ store_cpu_topology(cpunum);
+
+ 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.
+ */
+ per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
+ per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
+
+ if (cpunum == 0)
+ 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 CONFIG_64BIT
+ "Halting Machine - FP required\n"
+#endif
+ , coproc_cfg.ccr_functional);
+#ifdef CONFIG_64BIT
+ 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 CPUs.
+ */
+int
+show_cpuinfo (struct seq_file *m, void *v)
+{
+ unsigned long cpu;
+ char cpu_name[60], *p;
+
+ /* strip PA path from CPU name to not confuse lscpu */
+ strlcpy(cpu_name, per_cpu(cpu_data, 0).dev->name, sizeof(cpu_name));
+ p = strrchr(cpu_name, '[');
+ if (p)
+ *(--p) = 0;
+
+ for_each_online_cpu(cpu) {
+#ifdef CONFIG_SMP
+ const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
+
+ if (0 == cpuinfo->hpa)
+ continue;
+#endif
+ seq_printf(m, "processor\t: %lu\n"
+ "cpu family\t: PA-RISC %s\n",
+ cpu, 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 );
+
+#ifdef CONFIG_PARISC_CPU_TOPOLOGY
+ seq_printf(m, "physical id\t: %d\n",
+ topology_physical_package_id(cpu));
+ seq_printf(m, "siblings\t: %d\n",
+ cpumask_weight(topology_core_cpumask(cpu)));
+ seq_printf(m, "core id\t\t: %d\n", topology_core_id(cpu));
+#endif
+
+ seq_printf(m, "capabilities\t:");
+ if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
+ seq_puts(m, " os32");
+ if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
+ seq_puts(m, " os64");
+ if (boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC)
+ seq_puts(m, " iopdir_fdc");
+ switch (boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) {
+ case PDC_MODEL_NVA_SUPPORTED:
+ seq_puts(m, " nva_supported");
+ break;
+ case PDC_MODEL_NVA_SLOW:
+ seq_puts(m, " nva_slow");
+ break;
+ case PDC_MODEL_NVA_UNSUPPORTED:
+ seq_puts(m, " needs_equivalent_aliasing");
+ break;
+ }
+ seq_printf(m, " (0x%02lx)\n", boot_cpu_data.pdc.capabilities);
+
+ seq_printf(m, "model\t\t: %s - %s\n",
+ boot_cpu_data.pdc.sys_model_name,
+ cpu_name);
+
+ 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 const struct parisc_device_id processor_tbl[] __initconst = {
+ { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
+ { 0, }
+};
+
+static struct parisc_driver cpu_driver __refdata = {
+ .name = "CPU",
+ .id_table = processor_tbl,
+ .probe = processor_probe
+};
+
+/**
+ * processor_init - Processor initialization procedure.
+ *
+ * Register this driver.
+ */
+void __init processor_init(void)
+{
+ register_parisc_driver(&cpu_driver);
+}
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