1 files changed, 674 insertions, 0 deletions

diff --git a/arch/parisc/kernel/inventory.c b/arch/parisc/kernel/inventory.c
new file mode 100644
index 000000000..7ab2f2a54
--- /dev/null
+++ b/arch/parisc/kernel/inventory.c
@@ -0,0 +1,674 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * inventory.c
+ *
+ * Copyright (c) 1999 The Puffin Group (David Kennedy and Alex deVries)
+ * Copyright (c) 2001 Matthew Wilcox for Hewlett-Packard
+ *
+ * These are the routines to discover what hardware exists in this box.
+ * This task is complicated by there being 3 different ways of
+ * performing an inventory, depending largely on the age of the box.
+ * The recommended way to do this is to check to see whether the machine
+ * is a `Snake' first, then try System Map, then try PAT.  We try System
+ * Map before checking for a Snake -- this probably doesn't cause any
+ * problems, but...
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/platform_device.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/mmzone.h>
+#include <asm/pdc.h>
+#include <asm/pdcpat.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+#include <asm/parisc-device.h>
+#include <asm/tlbflush.h>
+
+/*
+** Debug options
+** DEBUG_PAT Dump details which PDC PAT provides about ranges/devices.
+*/
+#undef DEBUG_PAT
+
+int pdc_type __ro_after_init = PDC_TYPE_ILLEGAL;
+
+/* cell number and location (PAT firmware only) */
+unsigned long parisc_cell_num __ro_after_init;
+unsigned long parisc_cell_loc __ro_after_init;
+unsigned long parisc_pat_pdc_cap __ro_after_init;
+
+
+void __init setup_pdc(void)
+{
+	long status;
+	unsigned int bus_id;
+	struct pdc_system_map_mod_info module_result;
+	struct pdc_module_path module_path;
+	struct pdc_model model;
+#ifdef CONFIG_64BIT
+	struct pdc_pat_cell_num cell_info;
+#endif
+
+	/* Determine the pdc "type" used on this machine */
+
+	printk(KERN_INFO "Determining PDC firmware type: ");
+
+	status = pdc_system_map_find_mods(&module_result, &module_path, 0);
+	if (status == PDC_OK) {
+		pdc_type = PDC_TYPE_SYSTEM_MAP;
+		pr_cont("System Map.\n");
+		return;
+	}
+
+	/*
+	 * If the machine doesn't support PDC_SYSTEM_MAP then either it
+	 * is a pdc pat box, or it is an older box. All 64 bit capable
+	 * machines are either pdc pat boxes or they support PDC_SYSTEM_MAP.
+	 */
+
+	/*
+	 * TODO: We should test for 64 bit capability and give a
+	 * clearer message.
+	 */
+
+#ifdef CONFIG_64BIT
+	status = pdc_pat_cell_get_number(&cell_info);
+	if (status == PDC_OK) {
+		unsigned long legacy_rev, pat_rev;
+		pdc_type = PDC_TYPE_PAT;
+		pr_cont("64 bit PAT.\n");
+		parisc_cell_num = cell_info.cell_num;
+		parisc_cell_loc = cell_info.cell_loc;
+		pr_info("PAT: Running on cell %lu and location %lu.\n",
+			parisc_cell_num, parisc_cell_loc);
+		status = pdc_pat_pd_get_pdc_revisions(&legacy_rev,
+			&pat_rev, &parisc_pat_pdc_cap);
+		pr_info("PAT: legacy revision 0x%lx, pat_rev 0x%lx, pdc_cap 0x%lx, S-PTLB %d, HPMC_RENDEZ %d.\n",
+			legacy_rev, pat_rev, parisc_pat_pdc_cap,
+			parisc_pat_pdc_cap
+			 & PDC_PAT_CAPABILITY_BIT_SIMULTANEOUS_PTLB ? 1:0,
+			parisc_pat_pdc_cap
+			 & PDC_PAT_CAPABILITY_BIT_PDC_HPMC_RENDEZ   ? 1:0);
+		return;
+	}
+#endif
+
+	/* Check the CPU's bus ID.  There's probably a better test.  */
+
+	status = pdc_model_info(&model);
+
+	bus_id = (model.hversion >> (4 + 7)) & 0x1f;
+
+	switch (bus_id) {
+	case 0x4:		/* 720, 730, 750, 735, 755 */
+	case 0x6:		/* 705, 710 */
+	case 0x7:		/* 715, 725 */
+	case 0x8:		/* 745, 747, 742 */
+	case 0xA:		/* 712 and similar */
+	case 0xC:		/* 715/64, at least */
+
+		pdc_type = PDC_TYPE_SNAKE;
+		pr_cont("Snake.\n");
+		return;
+
+	default:		/* Everything else */
+
+		pr_cont("Unsupported.\n");
+		panic("If this is a 64-bit machine, please try a 64-bit kernel.\n");
+	}
+}
+
+#define PDC_PAGE_ADJ_SHIFT (PAGE_SHIFT - 12) /* pdc pages are always 4k */
+
+static void __init
+set_pmem_entry(physmem_range_t *pmem_ptr, unsigned long start,
+	       unsigned long pages4k)
+{
+	/* Rather than aligning and potentially throwing away
+	 * memory, we'll assume that any ranges are already
+	 * nicely aligned with any reasonable page size, and
+	 * panic if they are not (it's more likely that the
+	 * pdc info is bad in this case).
+	 */
+
+	if (unlikely( ((start & (PAGE_SIZE - 1)) != 0)
+	    || ((pages4k & ((1UL << PDC_PAGE_ADJ_SHIFT) - 1)) != 0) )) {
+
+		panic("Memory range doesn't align with page size!\n");
+	}
+
+	pmem_ptr->start_pfn = (start >> PAGE_SHIFT);
+	pmem_ptr->pages = (pages4k >> PDC_PAGE_ADJ_SHIFT);
+}
+
+static void __init pagezero_memconfig(void)
+{
+	unsigned long npages;
+
+	/* Use the 32 bit information from page zero to create a single
+	 * entry in the pmem_ranges[] table.
+	 *
+	 * We currently don't support machines with contiguous memory
+	 * >= 4 Gb, who report that memory using 64 bit only fields
+	 * on page zero. It's not worth doing until it can be tested,
+	 * and it is not clear we can support those machines for other
+	 * reasons.
+	 *
+	 * If that support is done in the future, this is where it
+	 * should be done.
+	 */
+
+	npages = (PAGE_ALIGN(PAGE0->imm_max_mem) >> PAGE_SHIFT);
+	set_pmem_entry(pmem_ranges,0UL,npages);
+	npmem_ranges = 1;
+}
+
+#ifdef CONFIG_64BIT
+
+/* All of the PDC PAT specific code is 64-bit only */
+
+/*
+**  The module object is filled via PDC_PAT_CELL[Return Cell Module].
+**  If a module is found, register module will get the IODC bytes via
+**  pdc_iodc_read() using the PA view of conf_base_addr for the hpa parameter.
+**
+**  The IO view can be used by PDC_PAT_CELL[Return Cell Module]
+**  only for SBAs and LBAs.  This view will cause an invalid
+**  argument error for all other cell module types.
+**
+*/
+
+static int __init 
+pat_query_module(ulong pcell_loc, ulong mod_index)
+{
+	pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;
+	unsigned long bytecnt;
+	unsigned long temp;	/* 64-bit scratch value */
+	long status;		/* PDC return value status */
+	struct parisc_device *dev;
+
+	pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
+	if (!pa_pdc_cell)
+		panic("couldn't allocate memory for PDC_PAT_CELL!");
+
+	/* return cell module (PA or Processor view) */
+	status = pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index,
+				     PA_VIEW, pa_pdc_cell);
+
+	if (status != PDC_OK) {
+		/* no more cell modules or error */
+		kfree(pa_pdc_cell);
+		return status;
+	}
+
+	temp = pa_pdc_cell->cba;
+	dev = alloc_pa_dev(PAT_GET_CBA(temp), &(pa_pdc_cell->mod_path));
+	if (!dev) {
+		kfree(pa_pdc_cell);
+		return PDC_OK;
+	}
+
+	/* alloc_pa_dev sets dev->hpa */
+
+	/*
+	** save parameters in the parisc_device
+	** (The idea being the device driver will call pdc_pat_cell_module()
+	** and store the results in its own data structure.)
+	*/
+	dev->pcell_loc = pcell_loc;
+	dev->mod_index = mod_index;
+
+	/* save generic info returned from the call */
+	/* REVISIT: who is the consumer of this? not sure yet... */
+	dev->mod_info = pa_pdc_cell->mod_info;	/* pass to PAT_GET_ENTITY() */
+	dev->pmod_loc = pa_pdc_cell->mod_location;
+	dev->mod0 = pa_pdc_cell->mod[0];
+
+	register_parisc_device(dev);	/* advertise device */
+
+#ifdef DEBUG_PAT
+	/* dump what we see so far... */
+	switch (PAT_GET_ENTITY(dev->mod_info)) {
+		pdc_pat_cell_mod_maddr_block_t io_pdc_cell;
+		unsigned long i;
+
+	case PAT_ENTITY_PROC:
+		printk(KERN_DEBUG "PAT_ENTITY_PROC: id_eid 0x%lx\n",
+			pa_pdc_cell->mod[0]);
+		break;
+
+	case PAT_ENTITY_MEM:
+		printk(KERN_DEBUG 
+			"PAT_ENTITY_MEM: amount 0x%lx min_gni_base 0x%lx min_gni_len 0x%lx\n",
+			pa_pdc_cell->mod[0], pa_pdc_cell->mod[1],
+			pa_pdc_cell->mod[2]);
+		break;
+	case PAT_ENTITY_CA:
+		printk(KERN_DEBUG "PAT_ENTITY_CA: %ld\n", pcell_loc);
+		break;
+
+	case PAT_ENTITY_PBC:
+		printk(KERN_DEBUG "PAT_ENTITY_PBC: ");
+		goto print_ranges;
+
+	case PAT_ENTITY_SBA:
+		printk(KERN_DEBUG "PAT_ENTITY_SBA: ");
+		goto print_ranges;
+
+	case PAT_ENTITY_LBA:
+		printk(KERN_DEBUG "PAT_ENTITY_LBA: ");
+
+ print_ranges:
+		pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index,
+				    IO_VIEW, &io_pdc_cell);
+		printk(KERN_DEBUG "ranges %ld\n", pa_pdc_cell->mod[1]);
+		for (i = 0; i < pa_pdc_cell->mod[1]; i++) {
+			printk(KERN_DEBUG 
+				"  PA_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n", 
+				i, pa_pdc_cell->mod[2 + i * 3],	/* type */
+				pa_pdc_cell->mod[3 + i * 3],	/* start */
+				pa_pdc_cell->mod[4 + i * 3]);	/* finish (ie end) */
+			printk(KERN_DEBUG 
+				"  IO_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n", 
+				i, io_pdc_cell.mod[2 + i * 3],	/* type */
+				io_pdc_cell.mod[3 + i * 3],	/* start */
+				io_pdc_cell.mod[4 + i * 3]);	/* finish (ie end) */
+		}
+		printk(KERN_DEBUG "\n");
+		break;
+	}
+#endif /* DEBUG_PAT */
+
+	kfree(pa_pdc_cell);
+
+	return PDC_OK;
+}
+
+
+/* pat pdc can return information about a variety of different
+ * types of memory (e.g. firmware,i/o, etc) but we only care about
+ * the usable physical ram right now. Since the firmware specific
+ * information is allocated on the stack, we'll be generous, in
+ * case there is a lot of other information we don't care about.
+ */
+
+#define PAT_MAX_RANGES (4 * MAX_PHYSMEM_RANGES)
+
+static void __init pat_memconfig(void)
+{
+	unsigned long actual_len;
+	struct pdc_pat_pd_addr_map_entry mem_table[PAT_MAX_RANGES+1];
+	struct pdc_pat_pd_addr_map_entry *mtbl_ptr;
+	physmem_range_t *pmem_ptr;
+	long status;
+	int entries;
+	unsigned long length;
+	int i;
+
+	length = (PAT_MAX_RANGES + 1) * sizeof(struct pdc_pat_pd_addr_map_entry);
+
+	status = pdc_pat_pd_get_addr_map(&actual_len, mem_table, length, 0L);
+
+	if ((status != PDC_OK)
+	    || ((actual_len % sizeof(struct pdc_pat_pd_addr_map_entry)) != 0)) {
+
+		/* The above pdc call shouldn't fail, but, just in
+		 * case, just use the PAGE0 info.
+		 */
+
+		printk("\n\n\n");
+		printk(KERN_WARNING "WARNING! Could not get full memory configuration. "
+			"All memory may not be used!\n\n\n");
+		pagezero_memconfig();
+		return;
+	}
+
+	entries = actual_len / sizeof(struct pdc_pat_pd_addr_map_entry);
+
+	if (entries > PAT_MAX_RANGES) {
+		printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
+		printk(KERN_WARNING "Some memory may not be used!\n");
+	}
+
+	/* Copy information into the firmware independent pmem_ranges
+	 * array, skipping types we don't care about. Notice we said
+	 * "may" above. We'll use all the entries that were returned.
+	 */
+
+	npmem_ranges = 0;
+	mtbl_ptr = mem_table;
+	pmem_ptr = pmem_ranges; /* Global firmware independent table */
+	for (i = 0; i < entries; i++,mtbl_ptr++) {
+		if (   (mtbl_ptr->entry_type != PAT_MEMORY_DESCRIPTOR)
+		    || (mtbl_ptr->memory_type != PAT_MEMTYPE_MEMORY)
+		    || (mtbl_ptr->pages == 0)
+		    || (   (mtbl_ptr->memory_usage != PAT_MEMUSE_GENERAL)
+			&& (mtbl_ptr->memory_usage != PAT_MEMUSE_GI)
+			&& (mtbl_ptr->memory_usage != PAT_MEMUSE_GNI) ) ) {
+
+			continue;
+		}
+
+		if (npmem_ranges == MAX_PHYSMEM_RANGES) {
+			printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
+			printk(KERN_WARNING "Some memory will not be used!\n");
+			break;
+		}
+
+		set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages);
+		npmem_ranges++;
+	}
+}
+
+static int __init pat_inventory(void)
+{
+	int status;
+	ulong mod_index = 0;
+	struct pdc_pat_cell_num cell_info;
+
+	/*
+	** Note:  Prelude (and it's successors: Lclass, A400/500) only
+	**        implement PDC_PAT_CELL sub-options 0 and 2.
+	*/
+	status = pdc_pat_cell_get_number(&cell_info);
+	if (status != PDC_OK) {
+		return 0;
+	}
+
+#ifdef DEBUG_PAT
+	printk(KERN_DEBUG "CELL_GET_NUMBER: 0x%lx 0x%lx\n", cell_info.cell_num, 
+	       cell_info.cell_loc);
+#endif
+
+	while (PDC_OK == pat_query_module(cell_info.cell_loc, mod_index)) {
+		mod_index++;
+	}
+
+	return mod_index;
+}
+
+/* We only look for extended memory ranges on a 64 bit capable box */
+static void __init sprockets_memconfig(void)
+{
+	struct pdc_memory_table_raddr r_addr;
+	struct pdc_memory_table mem_table[MAX_PHYSMEM_RANGES];
+	struct pdc_memory_table *mtbl_ptr;
+	physmem_range_t *pmem_ptr;
+	long status;
+	int entries;
+	int i;
+
+	status = pdc_mem_mem_table(&r_addr,mem_table,
+				(unsigned long)MAX_PHYSMEM_RANGES);
+
+	if (status != PDC_OK) {
+
+		/* The above pdc call only works on boxes with sprockets
+		 * firmware (newer B,C,J class). Other non PAT PDC machines
+		 * do support more than 3.75 Gb of memory, but we don't
+		 * support them yet.
+		 */
+
+		pagezero_memconfig();
+		return;
+	}
+
+	if (r_addr.entries_total > MAX_PHYSMEM_RANGES) {
+		printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
+		printk(KERN_WARNING "Some memory will not be used!\n");
+	}
+
+	entries = (int)r_addr.entries_returned;
+
+	npmem_ranges = 0;
+	mtbl_ptr = mem_table;
+	pmem_ptr = pmem_ranges; /* Global firmware independent table */
+	for (i = 0; i < entries; i++,mtbl_ptr++) {
+		set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages);
+		npmem_ranges++;
+	}
+}
+
+#else   /* !CONFIG_64BIT */
+
+#define pat_inventory() do { } while (0)
+#define pat_memconfig() do { } while (0)
+#define sprockets_memconfig() pagezero_memconfig()
+
+#endif	/* !CONFIG_64BIT */
+
+
+#ifndef CONFIG_PA20
+
+/* Code to support Snake machines (7[2350], 7[235]5, 715/Scorpio) */
+
+static struct parisc_device * __init
+legacy_create_device(struct pdc_memory_map *r_addr,
+		struct pdc_module_path *module_path)
+{
+	struct parisc_device *dev;
+	int status = pdc_mem_map_hpa(r_addr, module_path);
+	if (status != PDC_OK)
+		return NULL;
+
+	dev = alloc_pa_dev(r_addr->hpa, &module_path->path);
+	if (dev == NULL)
+		return NULL;
+
+	register_parisc_device(dev);
+	return dev;
+}
+
+/**
+ * snake_inventory
+ *
+ * Before PDC_SYSTEM_MAP was invented, the PDC_MEM_MAP call was used.
+ * To use it, we initialise the mod_path.bc to 0xff and try all values of
+ * mod to get the HPA for the top-level devices.  Bus adapters may have
+ * sub-devices which are discovered by setting bc[5] to 0 and bc[4] to the
+ * module, then trying all possible functions.
+ */
+static void __init snake_inventory(void)
+{
+	int mod;
+	for (mod = 0; mod < 16; mod++) {
+		struct parisc_device *dev;
+		struct pdc_module_path module_path;
+		struct pdc_memory_map r_addr;
+		unsigned int func;
+
+		memset(module_path.path.bc, 0xff, 6);
+		module_path.path.mod = mod;
+		dev = legacy_create_device(&r_addr, &module_path);
+		if ((!dev) || (dev->id.hw_type != HPHW_BA))
+			continue;
+
+		memset(module_path.path.bc, 0xff, 4);
+		module_path.path.bc[4] = mod;
+
+		for (func = 0; func < 16; func++) {
+			module_path.path.bc[5] = 0;
+			module_path.path.mod = func;
+			legacy_create_device(&r_addr, &module_path);
+		}
+	}
+}
+
+#else /* CONFIG_PA20 */
+#define snake_inventory() do { } while (0)
+#endif  /* CONFIG_PA20 */
+
+/* Common 32/64 bit based code goes here */
+
+/**
+ * add_system_map_addresses - Add additional addresses to the parisc device.
+ * @dev: The parisc device.
+ * @num_addrs: Then number of addresses to add;
+ * @module_instance: The system_map module instance.
+ *
+ * This function adds any additional addresses reported by the system_map
+ * firmware to the parisc device.
+ */
+static void __init
+add_system_map_addresses(struct parisc_device *dev, int num_addrs, 
+			 int module_instance)
+{
+	int i;
+	long status;
+	struct pdc_system_map_addr_info addr_result;
+
+	dev->addr = kmalloc_array(num_addrs, sizeof(*dev->addr), GFP_KERNEL);
+	if(!dev->addr) {
+		printk(KERN_ERR "%s %s(): memory allocation failure\n",
+		       __FILE__, __func__);
+		return;
+	}
+
+	for(i = 1; i <= num_addrs; ++i) {
+		status = pdc_system_map_find_addrs(&addr_result, 
+						   module_instance, i);
+		if(PDC_OK == status) {
+			dev->addr[dev->num_addrs] = (unsigned long)addr_result.mod_addr;
+			dev->num_addrs++;
+		} else {
+			printk(KERN_WARNING 
+			       "Bad PDC_FIND_ADDRESS status return (%ld) for index %d\n",
+			       status, i);
+		}
+	}
+}
+
+/**
+ * system_map_inventory - Retrieve firmware devices via SYSTEM_MAP.
+ *
+ * This function attempts to retrieve and register all the devices firmware
+ * knows about via the SYSTEM_MAP PDC call.
+ */
+static void __init system_map_inventory(void)
+{
+	int i;
+	long status = PDC_OK;
+    
+	for (i = 0; i < 256; i++) {
+		struct parisc_device *dev;
+		struct pdc_system_map_mod_info module_result;
+		struct pdc_module_path module_path;
+
+		status = pdc_system_map_find_mods(&module_result,
+				&module_path, i);
+		if ((status == PDC_BAD_PROC) || (status == PDC_NE_MOD))
+			break;
+		if (status != PDC_OK)
+			continue;
+
+		dev = alloc_pa_dev(module_result.mod_addr, &module_path.path);
+		if (!dev)
+			continue;
+		
+		register_parisc_device(dev);
+
+		/* if available, get the additional addresses for a module */
+		if (!module_result.add_addrs)
+			continue;
+
+		add_system_map_addresses(dev, module_result.add_addrs, i);
+	}
+
+	walk_central_bus();
+	return;
+}
+
+void __init do_memory_inventory(void)
+{
+	switch (pdc_type) {
+
+	case PDC_TYPE_PAT:
+		pat_memconfig();
+		break;
+
+	case PDC_TYPE_SYSTEM_MAP:
+		sprockets_memconfig();
+		break;
+
+	case PDC_TYPE_SNAKE:
+		pagezero_memconfig();
+		return;
+
+	default:
+		panic("Unknown PDC type!\n");
+	}
+
+	if (npmem_ranges == 0 || pmem_ranges[0].start_pfn != 0) {
+		printk(KERN_WARNING "Bad memory configuration returned!\n");
+		printk(KERN_WARNING "Some memory may not be used!\n");
+		pagezero_memconfig();
+	}
+}
+
+void __init do_device_inventory(void)
+{
+	printk(KERN_INFO "Searching for devices...\n");
+
+	init_parisc_bus();
+
+	switch (pdc_type) {
+
+	case PDC_TYPE_PAT:
+		pat_inventory();
+		break;
+
+	case PDC_TYPE_SYSTEM_MAP:
+		system_map_inventory();
+		break;
+
+	case PDC_TYPE_SNAKE:
+		snake_inventory();
+		break;
+
+	default:
+		panic("Unknown PDC type!\n");
+	}
+	printk(KERN_INFO "Found devices:\n");
+	print_parisc_devices();
+
+#if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
+	pa_serialize_tlb_flushes = machine_has_merced_bus();
+	if (pa_serialize_tlb_flushes)
+		pr_info("Merced bus found: Enable PxTLB serialization.\n");
+#endif
+
+#if defined(CONFIG_FW_CFG_SYSFS)
+	if (running_on_qemu) {
+		struct resource res[3] = {0,};
+		unsigned int base;
+
+		base = ((unsigned long long) PAGE0->pad0[2] << 32)
+			| PAGE0->pad0[3]; /* SeaBIOS stored it here */
+
+		res[0].name = "fw_cfg";
+		res[0].start = base;
+		res[0].end = base + 8 - 1;
+		res[0].flags = IORESOURCE_MEM;
+
+		res[1].name = "ctrl";
+		res[1].start = 0;
+		res[1].flags = IORESOURCE_REG;
+
+		res[2].name = "data";
+		res[2].start = 4;
+		res[2].flags = IORESOURCE_REG;
+
+		if (base) {
+			pr_info("Found qemu fw_cfg interface at %#08x\n", base);
+			platform_device_register_simple("fw_cfg",
+				PLATFORM_DEVID_NONE, res, 3);
+		}
+	}
+#endif
+}