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

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diff -urN linux-2.4.19/arch/parisc/kernel/inventory.c linux-2.4.20/arch/parisc/kernel/inventory.c
@@ -1,40 +1,157 @@
-
-/* Copyright (c) 1999 The Puffin Group */
-/* Written by David Kennedy and Alex deVries */
+/*
+ * inventory.c
+ *
+ * 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 of the License, or (at your option) any later version.
+ *
+ * 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 <asm/hardware.h>
 #include <asm/io.h>
 #include <asm/pdc.h>
+#include <asm/processor.h>
+#include <asm/page.h>
 
 /*
 ** Debug options
-**    DEBUG_PAT	Dump details which PDC PAT provides about ranges/devices.
+** DEBUG_PAT Dump details which PDC PAT provides about ranges/devices.
 */
 #undef DEBUG_PAT
 
-extern char *parisc_getHWtype(unsigned short hw_type);
+int pdc_type = PDC_TYPE_ILLEGAL;
+
+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 __LP64__
+	struct pdc_pat_cell_num cell_info;
+#endif
 
-extern struct hp_device * register_module(void *hpa);
-extern void print_devices(char * buf);
+	/* Determine the pdc "type" used on this machine */
 
+	printk(KERN_INFO "Determining PDC firmware type: ");
 
-int pdc_hpa_processor(void *address);
+	status = pdc_system_map_find_mods(&module_result, &module_path, 0);
+	if (status == PDC_OK) {
+		pdc_type = PDC_TYPE_SYSTEM_MAP;
+		printk("System Map.\n");
+		return;
+	}
 
-#ifndef __LP64__ 
-static	u8 iodc_data[32] __attribute__ ((aligned (64)));
-static	struct pdc_model model __attribute__ ((aligned (8)));
+	/*
+	 * 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 __LP64__
+	status = pdc_pat_cell_get_number(&cell_info);
+	if (status == PDC_OK) {
+		pdc_type = PDC_TYPE_PAT;
+		printk("64 bit PAT.\n");
+		return;
+	}
 #endif
-static	unsigned long pdc_result[32] __attribute__ ((aligned (8))) = {0,0,0,0};
-static	struct pdc_hpa processor_hpa __attribute__ ((aligned (8)));
-static	struct pdc_system_map module_result __attribute__ ((aligned (8)));
-static	struct pdc_module_path module_path __attribute__ ((aligned (8)));
+
+	/* 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 similiar */
+	case 0xC:		/* 715/64, at least */
+
+		pdc_type = PDC_TYPE_SNAKE;
+		printk("Snake.\n");
+		return;
+
+	default:		/* Everything else */
+
+		printk("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 (   ((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 __LP64__
-#include <asm/pdcpat.h>
 
-int pdc_pat = 0;
+/* All of the PDC PAT specific code is 64-bit only */
 
 /*
 **  The module object is filled via PDC_PAT_CELL[Return Cell Module].
@@ -47,30 +164,37 @@
 **
 */
 
-static int
-pat_query_module( ulong pcell_loc, ulong mod_index)
+static int __init 
+pat_query_module(ulong pcell_loc, ulong mod_index)
 {
-	extern int num_devices;
-	extern struct hp_device devices[];
-
 	pdc_pat_cell_mod_maddr_block_t pa_pdc_cell;
-        struct hp_device * dev = &devices[num_devices];
-	uint64_t temp;             /* 64-bit scratch value */
-	long status;               /* PDC return value status */
+	pdc_pat_cell_mod_maddr_block_t io_pdc_cell;
+	unsigned long bytecnt;
+	unsigned long temp;	/* 64-bit scratch value */
+	long status;		/* PDC return value status */
+	struct parisc_device *dev;
 
 	/* return cell module (PA or Processor view) */
-	status = pdc_pat_cell_module(& pdc_result, pcell_loc, mod_index,
-		PA_VIEW, & pa_pdc_cell);
+	status = pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index,
+				     PA_VIEW, &pa_pdc_cell);
 
-	if (status != PDC_RET_OK) {
+	if (status != PDC_OK) {
 		/* no more cell modules or error */
 		return status;
 	}
 
+	temp = pa_pdc_cell.cba;
+	dev = alloc_pa_dev(PAT_GET_CBA(temp), &pa_pdc_cell.mod_path);
+	if (!dev) {
+		return PDC_NE_MOD;
+	}
+
+	/* alloc_pa_dev sets dev->hpa */
+
 	/*
-	** save parameters in the hp_device
+	** save parameters in the parisc_device
 	** (The idea being the device driver will call pdc_pat_cell_module()
-	** and store the results in it's own data structure.)
+	** and store the results in its own data structure.)
 	*/
 	dev->pcell_loc = pcell_loc;
 	dev->mod_index = mod_index;
@@ -79,319 +203,410 @@
 	/* 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->mod_path = pa_pdc_cell.mod_path;
 
-	temp = pa_pdc_cell.cba;
-	register_module((void *) PAT_GET_CBA(temp));	/* fills in dev->hpa */
+	register_parisc_device(dev);	/* advertise device */
 
 #ifdef DEBUG_PAT
 	/* dump what we see so far... */
 	switch (PAT_GET_ENTITY(dev->mod_info)) {
-		ulong i;
+		unsigned long i;
 
 	case PAT_ENTITY_PROC:
-		printk ("PAT_ENTITY_PROC: id_eid 0x%lx\n", pa_pdc_cell.mod[0]);
+		printk(KERN_DEBUG "PAT_ENTITY_PROC: id_eid 0x%lx\n",
+			pa_pdc_cell.mod[0]);
 		break;
 
 	case PAT_ENTITY_MEM:
-		printk ("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],
+		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 ("PAT_ENTITY_CA: %ld\n",pcell_loc);
+		printk(KERN_DEBUG "PAT_ENTITY_CA: %ld\n", pcell_loc);
 		break;
 
 	case PAT_ENTITY_PBC:
-		printk ("PAT_ENTITY_PBC: ");
+		printk(KERN_DEBUG "PAT_ENTITY_PBC: ");
 		goto print_ranges;
 
 	case PAT_ENTITY_SBA:
-		printk ("PAT_ENTITY_SBA: ");
+		printk(KERN_DEBUG "PAT_ENTITY_SBA: ");
 		goto print_ranges;
 
 	case PAT_ENTITY_LBA:
-		printk ("PAT_ENTITY_LBA: ");
+		printk(KERN_DEBUG "PAT_ENTITY_LBA: ");
 
-print_ranges:
-		printk ("ranges %ld\n", pa_pdc_cell.mod[1]);
+ 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 ("	%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 
+				"  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("\n");
+		printk(KERN_DEBUG "\n");
 		break;
 	}
 #endif /* DEBUG_PAT */
-	return PDC_RET_OK;
+	return PDC_OK;
 }
 
 
-static int do_pat_inventory(void)
-{
-	ulong mod_index=0;
-	int status;
-	ulong cell_num;
-	ulong pcell_loc;
+/* 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.
+ */
 
-	pdc_pat = (pdc_pat_cell_get_number(&pdc_result) == PDC_OK);
-	if (!pdc_pat)
-	{
-		return 0;
-	}
-
-	cell_num = pdc_result[0];	/* Cell number call was made */
-
-	/* As of PDC PAT ARS 2.5, ret[1] is NOT architected! */
-	pcell_loc = pdc_result[1];	/* Physical location of the cell */
-
-#ifdef DEBUG_PAT
-	printk("CELL_GET_NUMBER: 0x%lx 0x%lx\n", cell_num, pcell_loc);
-#endif
-
-        status = pdc_pat_cell_num_to_loc(&pdc_result, cell_num);
-        if (status == PDC_BAD_OPTION)
-	{
-		/* Prelude (and it's successors: Lclass, A400/500) only
-		** implement PDC_PAT_CELL sub-options 0 and 2.
-		** "Home cook'n is best anyhow!"
-		*/
-	} else if (PDC_OK == status) {
-		/* so far only Halfdome supports this */
-		pcell_loc = pdc_result[0];
-	} else {
-		panic("WTF? CELL_GET_NUMBER give me invalid cell number?");
-	}
-
-	while (PDC_RET_OK == pat_query_module(pcell_loc, mod_index))
-	{
-		mod_index++;
-	}
-
-	return mod_index;
-}
-#endif /* __LP64__ */
+#define PAT_MAX_RANGES (4 * MAX_PHYSMEM_RANGES)
 
-static int do_newer_workstation_inventory(void)
+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 i, num = 0;
+	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;
+	}
 
-	/* So the idea here is to simply try one SYSTEM_MAP call.  If 
-	   that one works, great, otherwise do it another way */
+	entries = actual_len / sizeof(struct pdc_pat_pd_addr_map_entry);
 
-	status = pdc_system_map_find_mods(&module_result,&module_path,0);
+	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");
+	}
 
-	if (status == PDC_RET_OK) {
-		/* This is for newer non-PDC-PAT boxes */
+	/* 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) ) ) {
 
-		printk("a newer box...\n");
-		for(i=0, status=PDC_RET_OK; status != PDC_RET_NE_PROC && 
-			status != PDC_RET_NE_MOD ;i++) {
+			continue;
+		}
 
-			status = pdc_system_map_find_mods(&module_result,&module_path,i);
-			if (status == PDC_RET_OK) {
-				num++;
-				register_module(module_result.mod_addr);
-			}
+		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;
 		}
-	}
 
-	return (num > 0);
+		set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages);
+		npmem_ranges++;
+	}
 }
 
-#ifndef __LP64__
-static	struct  pdc_memory_map r_addr __attribute__ ((aligned (8)));
-
-static int really_do_oldhw_inventory(void)
+static int __init pat_inventory(void)
 {
-	int i, mod, num = 0;
 	int status;
-	unsigned int hw_type;
-	unsigned int func;
+	ulong mod_index = 0;
+	struct pdc_pat_cell_num cell_info;
 
-	/* This is undocumented at the time of writing, but basically 
-	   we're setting up mod_path so that bc[0..4]=0xff, and step
-	   through mod to get the "Path Structure for GSC Modules".  If
-	   it works, use the returned HPA and determine the hardware type.  */
+	/*
+	** 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;
+	}
 
-	for (i=0;i<6;i++) module_path.bc[i]=0xff;
+#ifdef DEBUG_PAT
+	printk(KERN_DEBUG "CELL_GET_NUMBER: 0x%lx 0x%lx\n", cell_info.cell_num, 
+	       cell_info.cell_loc);
+#endif
 
-	for (mod=0;mod<16;mod++) {
-		char *stype = NULL;
+	while (PDC_OK == pat_query_module(cell_info.cell_loc, mod_index)) {
+		mod_index++;
+	}
 
-		module_path.mod=mod;
-		status = pdc_mem_map_hpa(&r_addr, &module_path);
-		if (status!=PDC_RET_OK) continue;
-	
-		status = pdc_iodc_read(&pdc_result,(void *) r_addr.hpa,
-			0, &iodc_data,32 );
-		if (status!=PDC_RET_OK) continue;
-		hw_type = iodc_data[3]&0x1f;
+	return mod_index;
+}
 
-		switch (hw_type)
-		{
-		case HPHW_NPROC:	/* 0 */
-			stype="Processor"; break;
+/* 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;
 
-		case HPHW_MEMORY:	/* 1 */
-			stype="Memory"; break;
+	status = pdc_mem_mem_table(&r_addr,mem_table,
+				(unsigned long)MAX_PHYSMEM_RANGES);
 
-		case HPHW_B_DMA:	/* 2 */
-			stype="Type B DMA"; break;
+	if (status != PDC_OK) {
 
-		case HPHW_A_DMA:	/* 4 */
-			stype="Type A DMA"; break;
+		/* 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.
+		 */
 
-		case HPHW_A_DIRECT:	/* 5 */
-			stype="Type A Direct"; break;
+		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");
+	}
 
-		case HPHW_BCPORT:	/* 7 */
-			stype="Bus Converter Port"; break;
+	entries = (int)r_addr.entries_returned;
 
-		case HPHW_CONSOLE:	/* 9 */
-			stype="Console"; break;
+	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++;
+	}
+}
 
-		case HPHW_FIO:		/* 10 - Graphics */
-			stype="Foreign I/O (Graphics)"; break;
+#else   /* !__LP64__ */
 
-		case HPHW_BA:		/* 11 - Bus Adapter */
-			stype="Bus Adapter"; break;
+#define pat_inventory() do { } while (0)
+#define pat_memconfig() do { } while (0)
+#define sprockets_memconfig() pagezero_memconfig()
 
-		case HPHW_IOA:		/* 12 */
-			stype="I/O Adapter"; break;
+#endif	/* !__LP64__ */
 
-		case HPHW_BRIDGE:	/* 13 */
-			stype="Bridge"; break;
 
-		case HPHW_FABRIC:	/* 14 */
-			stype="Fabric"; break;
+#ifndef CONFIG_PA20
 
-		case HPHW_FAULTY:	/* 31 */
-			stype="Faulty HW"; break;
+/* Code to support Snake machines (7[2350], 7[235]5, 715/Scorpio) */
 
-		case HPHW_OTHER:	/* 42 */
-		default:	
-			printk("Don't know this hw_type: %d\n", hw_type);
-			break;
-		}
+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;
 
-		// This is kluged. But don't want to replicate code for
-		// most of the above cases.
-		if (stype) {
-#ifdef DBG_PDC_QUERY
-			// parisc/kernel/drivers.c
-			extern int num_devices; 
-			extern struct hp_device devices[];
-			struct hp_hardware *h;
-#endif
+	register_parisc_device(dev);
+	return dev;
+}
 
-			status = pdc_mem_map_hpa(&r_addr, &module_path);
-			if (status==PDC_RET_OK && register_module((void *) r_addr.hpa) != NULL)
-					num++;
-
-
-		    if (hw_type == HPHW_BA) {
-			/* Now, we're checking for devices for each
-			   module.  I seem to think that the
-			   modules in question are Lasi (2), 2nd Lasi (6)
-			   Wax (5).  To do this, set bc[5]=0, and set
-			   bc[4] to the module, and step through the
-			   functions. */
-
-			for (i=0;i<4;i++) module_path.bc[i]=0xff;
-			module_path.bc[4]=mod;
-			for (func=0;func<16;func++) {
-				module_path.mod = func;
-				module_path.bc[5]=0;
-				status = pdc_mem_map_hpa(&r_addr, &module_path);
-				if (status!=PDC_RET_OK) continue;
-				if (register_module((void *) r_addr.hpa) != NULL) 
-					num++;
-			}
+/**
+ * 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);
 		}
-		// reset module_path.bc[]
-		for (i=0;i<6;i++) module_path.bc[i]=0xff;
+	}
+}
 
+#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;
 
-#ifdef DBG_PDC_QUERY
-//
-// Let print_devices() dump everything which is registered.
-//
-			h = devices[num_devices-1].reference;
+	dev->addr = kmalloc(num_addrs * sizeof(unsigned long), GFP_KERNEL);
+	if(!dev->addr) {
+		printk(KERN_ERR "%s %s(): memory allocation failure\n",
+		       __FILE__, __FUNCTION__);
+		return;
+	}
 
-			if (h) stype = h->name;
-			printk("Found %s at %d\n", stype, module_path.mod);
-#endif
+	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);
 		}
 	}
-	return num;
 }
 
-static int
-do_old_inventory(void)
+/**
+ * do_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)
 {
-        unsigned int bus_id;
-	long status;
-	int ok = 0;
-
-	printk(" an older box...\n");
+	int i;
+	long status = PDC_OK;
+    
+	/*
+	 * first stop the usb controller, otherwise the machine
+	 * might crash during iommu setup
+	 */
+	pdc_suspend_usb();
+
+	for (i = 0; status != PDC_BAD_PROC && status != PDC_NE_MOD; 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_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;
 
-	/* Here, we're going to check the model, and decide
-	   if we should even bother trying. */
+		add_system_map_addresses(dev, module_result.add_addrs, i);
+	}
 
-	status = pdc_model_info(&model);
+	walk_central_bus();
+	return;
+}
 
-	bus_id = (model.hversion >> (4+7) ) &0x1f;
+void __init do_memory_inventory(void)
+{
+	switch (pdc_type) {
 
-	/* Here, we're checking the HVERSION of the CPU.
-	   We're only checking the 0th CPU, since it'll
-	   be the same on an SMP box. */
+	case PDC_TYPE_PAT:
+		pat_memconfig();
+		break;
 
-	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 similiar */
-		case 0xC: 	/* 715/64, at least */
-
-		/* Do inventory using MEM_MAP */
-		really_do_oldhw_inventory();
-		ok = 1;
+	case PDC_TYPE_SYSTEM_MAP:
+		sprockets_memconfig();
 		break;
-	default: 	/* Everything else */
-		printk("This is a very very old machine, with a bus_id of 0x%x.\n",bus_id);
-		panic("This will probably never run Linux.\n");
+
+	case PDC_TYPE_SNAKE:
+		pagezero_memconfig();
+		return;
+
+	default:
+		panic("Unknown PDC type!\n");
 	}
 
-	return ok;
+	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();
+	}
 }
 
-#endif /* !__LP64__ */
+void __init do_device_inventory(void)
+{
+	printk(KERN_INFO "Searching for devices...\n");
 
-void do_inventory(void){
-	if((pdc_hpa_processor(&processor_hpa))<0){
-		printk(KERN_INFO "Couldn't get the HPA of the processor.\n" );
-	}
+	switch (pdc_type) {
+
+	case PDC_TYPE_PAT:
+		pat_inventory();
+		break;
 
-	printk("Searching for devices in PDC firmware... ");
-	printk("processor hpa 0x%lx\n", processor_hpa.hpa);
+	case PDC_TYPE_SYSTEM_MAP:
+		system_map_inventory();
+		break;
 
-	if (!(
-		do_newer_workstation_inventory()
-#ifdef __LP64__
-		|| do_pat_inventory()
-#else /* __LP64__ */
-		|| do_old_inventory()
-#endif /* __LP64__ */
-	    ))
-	{
-	    panic("I can't get the hardware inventory on this machine");
+	case PDC_TYPE_SNAKE:
+		snake_inventory();
+		break;
+
+	default:
+		panic("Unknown PDC type!\n");
 	}
-	print_devices(NULL);
-}
 
+	printk(KERN_INFO "Found devices:\n");
+	print_parisc_devices();
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)