arch/powerpc/platforms/iseries/setup.c - kernel/msm-4.19 - Gitiles

 /*
  *    Copyright (c) 2000 Mike Corrigan <mikejc@us.ibm.com>
  *    Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
  *
  *    Description:
  *      Architecture- / platform-specific boot-time initialization code for
  *      the IBM iSeries LPAR.  Adapted from original code by Grant Erickson and
  *      code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
  *      <dan@net4x.com>.
  *
  *      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.
  */

 #undef DEBUG

 #include <linux/init.h>
 #include <linux/threads.h>
 #include <linux/smp.h>
 #include <linux/param.h>
 #include <linux/string.h>
 #include <linux/seq_file.h>
 #include <linux/kdev_t.h>
 #include <linux/kexec.h>
 #include <linux/major.h>
 #include <linux/root_dev.h>
 #include <linux/kernel.h>
 #include <linux/hrtimer.h>
 #include <linux/tick.h>

 #include <asm/processor.h>
 #include <asm/machdep.h>
 #include <asm/page.h>
 #include <asm/mmu.h>
 #include <asm/pgtable.h>
 #include <asm/mmu_context.h>
 #include <asm/cputable.h>
 #include <asm/sections.h>
 #include <asm/iommu.h>
 #include <asm/firmware.h>
 #include <asm/system.h>
 #include <asm/time.h>
 #include <asm/paca.h>
 #include <asm/cache.h>
 #include <asm/abs_addr.h>
 #include <asm/iseries/hv_lp_config.h>
 #include <asm/iseries/hv_call_event.h>
 #include <asm/iseries/hv_call_xm.h>
 #include <asm/iseries/it_lp_queue.h>
 #include <asm/iseries/mf.h>
 #include <asm/iseries/hv_lp_event.h>
 #include <asm/iseries/lpar_map.h>
 #include <asm/udbg.h>
 #include <asm/irq.h>

 #include "naca.h"
 #include "setup.h"
 #include "irq.h"
 #include "vpd_areas.h"
 #include "processor_vpd.h"
 #include "it_lp_naca.h"
 #include "main_store.h"
 #include "call_sm.h"
 #include "call_hpt.h"
 #include "pci.h"

 #ifdef DEBUG
 #define DBG(fmt...) udbg_printf(fmt)
 #else
 #define DBG(fmt...)
 #endif

 /* Function Prototypes */
 static unsigned long build_iSeries_Memory_Map(void);
 static void iseries_shared_idle(void);
 static void iseries_dedicated_idle(void);


 struct MemoryBlock {
 	unsigned long absStart;
 	unsigned long absEnd;
 	unsigned long logicalStart;
 	unsigned long logicalEnd;
 };

 /*
  * Process the main store vpd to determine where the holes in memory are
  * and return the number of physical blocks and fill in the array of
  * block data.
  */
 static unsigned long iSeries_process_Condor_mainstore_vpd(
 		struct MemoryBlock *mb_array, unsigned long max_entries)
 {
 	unsigned long holeFirstChunk, holeSizeChunks;
 	unsigned long numMemoryBlocks = 1;
 	struct IoHriMainStoreSegment4 *msVpd =
 		(struct IoHriMainStoreSegment4 *)xMsVpd;
 	unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
 	unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
 	unsigned long holeSize = holeEnd - holeStart;

 	printk("Mainstore_VPD: Condor\n");
 	/*
 	 * Determine if absolute memory has any
 	 * holes so that we can interpret the
 	 * access map we get back from the hypervisor
 	 * correctly.
 	 */
 	mb_array[0].logicalStart = 0;
 	mb_array[0].logicalEnd = 0x100000000UL;
 	mb_array[0].absStart = 0;
 	mb_array[0].absEnd = 0x100000000UL;

 	if (holeSize) {
 		numMemoryBlocks = 2;
 		holeStart = holeStart & 0x000fffffffffffffUL;
 		holeStart = addr_to_chunk(holeStart);
 		holeFirstChunk = holeStart;
 		holeSize = addr_to_chunk(holeSize);
 		holeSizeChunks = holeSize;
 		printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
 				holeFirstChunk, holeSizeChunks );
 		mb_array[0].logicalEnd = holeFirstChunk;
 		mb_array[0].absEnd = holeFirstChunk;
 		mb_array[1].logicalStart = holeFirstChunk;
 		mb_array[1].logicalEnd = 0x100000000UL - holeSizeChunks;
 		mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
 		mb_array[1].absEnd = 0x100000000UL;
 	}
 	return numMemoryBlocks;
 }

 #define MaxSegmentAreas			32
 #define MaxSegmentAdrRangeBlocks	128
 #define MaxAreaRangeBlocks		4

 static unsigned long iSeries_process_Regatta_mainstore_vpd(
 		struct MemoryBlock *mb_array, unsigned long max_entries)
 {
 	struct IoHriMainStoreSegment5 *msVpdP =
 		(struct IoHriMainStoreSegment5 *)xMsVpd;
 	unsigned long numSegmentBlocks = 0;
 	u32 existsBits = msVpdP->msAreaExists;
 	unsigned long area_num;

 	printk("Mainstore_VPD: Regatta\n");

 	for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
 		unsigned long numAreaBlocks;
 		struct IoHriMainStoreArea4 *currentArea;

 		if (existsBits & 0x80000000) {
 			unsigned long block_num;

 			currentArea = &msVpdP->msAreaArray[area_num];
 			numAreaBlocks = currentArea->numAdrRangeBlocks;
 			printk("ms_vpd: processing area %2ld  blocks=%ld",
 					area_num, numAreaBlocks);
 			for (block_num = 0; block_num < numAreaBlocks;
 					++block_num ) {
 				/* Process an address range block */
 				struct MemoryBlock tempBlock;
 				unsigned long i;

 				tempBlock.absStart =
 					(unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
 				tempBlock.absEnd =
 					(unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
 				tempBlock.logicalStart = 0;
 				tempBlock.logicalEnd   = 0;
 				printk("\n          block %ld absStart=%016lx absEnd=%016lx",
 						block_num, tempBlock.absStart,
 						tempBlock.absEnd);

 				for (i = 0; i < numSegmentBlocks; ++i) {
 					if (mb_array[i].absStart ==
 							tempBlock.absStart)
 						break;
 				}
 				if (i == numSegmentBlocks) {
 					if (numSegmentBlocks == max_entries)
 						panic("iSeries_process_mainstore_vpd: too many memory blocks");
 					mb_array[numSegmentBlocks] = tempBlock;
 					++numSegmentBlocks;
 				} else
 					printk(" (duplicate)");
 			}
 			printk("\n");
 		}
 		existsBits <<= 1;
 	}
 	/* Now sort the blocks found into ascending sequence */
 	if (numSegmentBlocks > 1) {
 		unsigned long m, n;

 		for (m = 0; m < numSegmentBlocks - 1; ++m) {
 			for (n = numSegmentBlocks - 1; m < n; --n) {
 				if (mb_array[n].absStart <
 						mb_array[n-1].absStart) {
 					struct MemoryBlock tempBlock;

 					tempBlock = mb_array[n];
 					mb_array[n] = mb_array[n-1];
 					mb_array[n-1] = tempBlock;
 				}
 			}
 		}
 	}
 	/*
 	 * Assign "logical" addresses to each block.  These
 	 * addresses correspond to the hypervisor "bitmap" space.
 	 * Convert all addresses into units of 256K chunks.
 	 */
 	{
 	unsigned long i, nextBitmapAddress;

 	printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
 	nextBitmapAddress = 0;
 	for (i = 0; i < numSegmentBlocks; ++i) {
 		unsigned long length = mb_array[i].absEnd -
 			mb_array[i].absStart;

 		mb_array[i].logicalStart = nextBitmapAddress;
 		mb_array[i].logicalEnd = nextBitmapAddress + length;
 		nextBitmapAddress += length;
 		printk("          Bitmap range: %016lx - %016lx\n"
 				"        Absolute range: %016lx - %016lx\n",
 				mb_array[i].logicalStart,
 				mb_array[i].logicalEnd,
 				mb_array[i].absStart, mb_array[i].absEnd);
 		mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
 				0x000fffffffffffffUL);
 		mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
 				0x000fffffffffffffUL);
 		mb_array[i].logicalStart =
 			addr_to_chunk(mb_array[i].logicalStart);
 		mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
 	}
 	}

 	return numSegmentBlocks;
 }

 static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
 		unsigned long max_entries)
 {
 	unsigned long i;
 	unsigned long mem_blocks = 0;

 	if (cpu_has_feature(CPU_FTR_SLB))
 		mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
 				max_entries);
 	else
 		mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
 				max_entries);

 	printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
 	for (i = 0; i < mem_blocks; ++i) {
 		printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
 		       "                             abs chunks %016lx - %016lx\n",
 			i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
 			mb_array[i].absStart, mb_array[i].absEnd);
 	}
 	return mem_blocks;
 }

 static void __init iSeries_get_cmdline(void)
 {
 	char *p, *q;

 	/* copy the command line parameter from the primary VSP  */
 	HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
 			HvLpDma_Direction_RemoteToLocal);

 	p = cmd_line;
 	q = cmd_line + 255;
 	while(p < q) {
 		if (!*p || *p == '\n')
 			break;
 		++p;
 	}
 	*p = 0;
 }

 static void __init iSeries_init_early(void)
 {
 	DBG(" -> iSeries_init_early()\n");

 	/* Snapshot the timebase, for use in later recalibration */
 	iSeries_time_init_early();

 	/*
 	 * Initialize the DMA/TCE management
 	 */
 	iommu_init_early_iSeries();

 	/* Initialize machine-dependency vectors */
 #ifdef CONFIG_SMP
 	smp_init_iSeries();
 #endif

 	/* Associate Lp Event Queue 0 with processor 0 */
 	HvCallEvent_setLpEventQueueInterruptProc(0, 0);

 	mf_init();

 	DBG(" <- iSeries_init_early()\n");
 }

 struct mschunks_map mschunks_map = {
 	/* XXX We don't use these, but Piranha might need them. */
 	.chunk_size  = MSCHUNKS_CHUNK_SIZE,
 	.chunk_shift = MSCHUNKS_CHUNK_SHIFT,
 	.chunk_mask  = MSCHUNKS_OFFSET_MASK,
 };
 EXPORT_SYMBOL(mschunks_map);

 static void mschunks_alloc(unsigned long num_chunks)
 {
 	klimit = _ALIGN(klimit, sizeof(u32));
 	mschunks_map.mapping = (u32 *)klimit;
 	klimit += num_chunks * sizeof(u32);
 	mschunks_map.num_chunks = num_chunks;
 }

 /*
  * The iSeries may have very large memories ( > 128 GB ) and a partition
  * may get memory in "chunks" that may be anywhere in the 2**52 real
  * address space.  The chunks are 256K in size.  To map this to the
  * memory model Linux expects, the AS/400 specific code builds a
  * translation table to translate what Linux thinks are "physical"
  * addresses to the actual real addresses.  This allows us to make
  * it appear to Linux that we have contiguous memory starting at
  * physical address zero while in fact this could be far from the truth.
  * To avoid confusion, I'll let the words physical and/or real address
  * apply to the Linux addresses while I'll use "absolute address" to
  * refer to the actual hardware real address.
  *
  * build_iSeries_Memory_Map gets information from the Hypervisor and
  * looks at the Main Store VPD to determine the absolute addresses
  * of the memory that has been assigned to our partition and builds
  * a table used to translate Linux's physical addresses to these
  * absolute addresses.  Absolute addresses are needed when
  * communicating with the hypervisor (e.g. to build HPT entries)
  *
  * Returns the physical memory size
  */

 static unsigned long __init build_iSeries_Memory_Map(void)
 {
 	u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
 	u32 nextPhysChunk;
 	u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
 	u32 totalChunks,moreChunks;
 	u32 currChunk, thisChunk, absChunk;
 	u32 currDword;
 	u32 chunkBit;
 	u64 map;
 	struct MemoryBlock mb[32];
 	unsigned long numMemoryBlocks, curBlock;

 	/* Chunk size on iSeries is 256K bytes */
 	totalChunks = (u32)HvLpConfig_getMsChunks();
 	mschunks_alloc(totalChunks);

 	/*
 	 * Get absolute address of our load area
 	 * and map it to physical address 0
 	 * This guarantees that the loadarea ends up at physical 0
 	 * otherwise, it might not be returned by PLIC as the first
 	 * chunks
 	 */

 	loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
 	loadAreaSize =  itLpNaca.xLoadAreaChunks;

 	/*
 	 * Only add the pages already mapped here.
 	 * Otherwise we might add the hpt pages
 	 * The rest of the pages of the load area
 	 * aren't in the HPT yet and can still
 	 * be assigned an arbitrary physical address
 	 */
 	if ((loadAreaSize * 64) > HvPagesToMap)
 		loadAreaSize = HvPagesToMap / 64;

 	loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;

 	/*
 	 * TODO Do we need to do something if the HPT is in the 64MB load area?
 	 * This would be required if the itLpNaca.xLoadAreaChunks includes
 	 * the HPT size
 	 */

 	printk("Mapping load area - physical addr = 0000000000000000\n"
 		"                    absolute addr = %016lx\n",
 		chunk_to_addr(loadAreaFirstChunk));
 	printk("Load area size %dK\n", loadAreaSize * 256);

 	for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
 		mschunks_map.mapping[nextPhysChunk] =
 			loadAreaFirstChunk + nextPhysChunk;

 	/*
 	 * Get absolute address of our HPT and remember it so
 	 * we won't map it to any physical address
 	 */
 	hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
 	hptSizePages = (u32)HvCallHpt_getHptPages();
 	hptSizeChunks = hptSizePages >>
 		(MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
 	hptLastChunk = hptFirstChunk + hptSizeChunks - 1;

 	printk("HPT absolute addr = %016lx, size = %dK\n",
 			chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);

 	/*
 	 * Determine if absolute memory has any
 	 * holes so that we can interpret the
 	 * access map we get back from the hypervisor
 	 * correctly.
 	 */
 	numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);

 	/*
 	 * Process the main store access map from the hypervisor
 	 * to build up our physical -> absolute translation table
 	 */
 	curBlock = 0;
 	currChunk = 0;
 	currDword = 0;
 	moreChunks = totalChunks;

 	while (moreChunks) {
 		map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
 				currDword);
 		thisChunk = currChunk;
 		while (map) {
 			chunkBit = map >> 63;
 			map <<= 1;
 			if (chunkBit) {
 				--moreChunks;
 				while (thisChunk >= mb[curBlock].logicalEnd) {
 					++curBlock;
 					if (curBlock >= numMemoryBlocks)
 						panic("out of memory blocks");
 				}
 				if (thisChunk < mb[curBlock].logicalStart)
 					panic("memory block error");

 				absChunk = mb[curBlock].absStart +
 					(thisChunk - mb[curBlock].logicalStart);
 				if (((absChunk < hptFirstChunk) ||
 				     (absChunk > hptLastChunk)) &&
 				    ((absChunk < loadAreaFirstChunk) ||
 				     (absChunk > loadAreaLastChunk))) {
 					mschunks_map.mapping[nextPhysChunk] =
 						absChunk;
 					++nextPhysChunk;
 				}
 			}
 			++thisChunk;
 		}
 		++currDword;
 		currChunk += 64;
 	}

 	/*
 	 * main store size (in chunks) is
 	 *   totalChunks - hptSizeChunks
 	 * which should be equal to
 	 *   nextPhysChunk
 	 */
 	return chunk_to_addr(nextPhysChunk);
 }

 /*
  * Document me.
  */
 static void __init iSeries_setup_arch(void)
 {
 	if (get_lppaca()->shared_proc) {
 		ppc_md.idle_loop = iseries_shared_idle;
 		printk(KERN_DEBUG "Using shared processor idle loop\n");
 	} else {
 		ppc_md.idle_loop = iseries_dedicated_idle;
 		printk(KERN_DEBUG "Using dedicated idle loop\n");
 	}

 	/* Setup the Lp Event Queue */
 	setup_hvlpevent_queue();

 	printk("Max  logical processors = %d\n",
 			itVpdAreas.xSlicMaxLogicalProcs);
 	printk("Max physical processors = %d\n",
 			itVpdAreas.xSlicMaxPhysicalProcs);

 	iSeries_pcibios_init();
 }

 static void iSeries_show_cpuinfo(struct seq_file *m)
 {
 	seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
 }

 static void __init iSeries_progress(char * st, unsigned short code)
 {
 	printk("Progress: [%04x] - %s\n", (unsigned)code, st);
 	mf_display_progress(code);
 }

 static void __init iSeries_fixup_klimit(void)
 {
 	/*
 	 * Change klimit to take into account any ram disk
 	 * that may be included
 	 */
 	if (naca.xRamDisk)
 		klimit = KERNELBASE + (u64)naca.xRamDisk +
 			(naca.xRamDiskSize * HW_PAGE_SIZE);
 }

 static int __init iSeries_src_init(void)
 {
         /* clear the progress line */
 	if (firmware_has_feature(FW_FEATURE_ISERIES))
 		ppc_md.progress(" ", 0xffff);
         return 0;
 }

 late_initcall(iSeries_src_init);

 static inline void process_iSeries_events(void)
 {
 	asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
 }

 static void yield_shared_processor(void)
 {
 	unsigned long tb;

 	HvCall_setEnabledInterrupts(HvCall_MaskIPI |
 				    HvCall_MaskLpEvent |
 				    HvCall_MaskLpProd |
 				    HvCall_MaskTimeout);

 	tb = get_tb();
 	/* Compute future tb value when yield should expire */
 	HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);

 	/*
 	 * The decrementer stops during the yield.  Force a fake decrementer
 	 * here and let the timer_interrupt code sort out the actual time.
 	 */
 	get_lppaca()->int_dword.fields.decr_int = 1;
 	ppc64_runlatch_on();
 	process_iSeries_events();
 }

 static void iseries_shared_idle(void)
 {
 	while (1) {
 		tick_nohz_stop_sched_tick(1);
 		while (!need_resched() && !hvlpevent_is_pending()) {
 			local_irq_disable();
 			ppc64_runlatch_off();

 			/* Recheck with irqs off */
 			if (!need_resched() && !hvlpevent_is_pending())
 				yield_shared_processor();

 			HMT_medium();
 			local_irq_enable();
 		}

 		ppc64_runlatch_on();
 		tick_nohz_restart_sched_tick();

 		if (hvlpevent_is_pending())
 			process_iSeries_events();

 		preempt_enable_no_resched();
 		schedule();
 		preempt_disable();
 	}
 }

 static void iseries_dedicated_idle(void)
 {
 	set_thread_flag(TIF_POLLING_NRFLAG);

 	while (1) {
 		tick_nohz_stop_sched_tick(1);
 		if (!need_resched()) {
 			while (!need_resched()) {
 				ppc64_runlatch_off();
 				HMT_low();

 				if (hvlpevent_is_pending()) {
 					HMT_medium();
 					ppc64_runlatch_on();
 					process_iSeries_events();
 				}
 			}

 			HMT_medium();
 		}

 		ppc64_runlatch_on();
 		tick_nohz_restart_sched_tick();
 		preempt_enable_no_resched();
 		schedule();
 		preempt_disable();
 	}
 }

 static void __iomem *iseries_ioremap(phys_addr_t address, unsigned long size,
 				     unsigned long flags)
 {
 	return (void __iomem *)address;
 }

 static void iseries_iounmap(volatile void __iomem *token)
 {
 }

 static int __init iseries_probe(void)
 {
 	unsigned long root = of_get_flat_dt_root();
 	if (!of_flat_dt_is_compatible(root, "IBM,iSeries"))
 		return 0;

 	hpte_init_iSeries();
 	/* iSeries does not support 16M pages */
 	cur_cpu_spec->cpu_features &= ~CPU_FTR_16M_PAGE;

 	return 1;
 }

 #ifdef CONFIG_KEXEC
 static int iseries_kexec_prepare(struct kimage *image)
 {
 	return -ENOSYS;
 }
 #endif

 define_machine(iseries) {
 	.name			= "iSeries",
 	.setup_arch		= iSeries_setup_arch,
 	.show_cpuinfo		= iSeries_show_cpuinfo,
 	.init_IRQ		= iSeries_init_IRQ,
 	.get_irq		= iSeries_get_irq,
 	.init_early		= iSeries_init_early,
 	.pcibios_fixup		= iSeries_pci_final_fixup,
 	.pcibios_fixup_resources= iSeries_pcibios_fixup_resources,
 	.restart		= mf_reboot,
 	.power_off		= mf_power_off,
 	.halt			= mf_power_off,
 	.get_boot_time		= iSeries_get_boot_time,
 	.set_rtc_time		= iSeries_set_rtc_time,
 	.get_rtc_time		= iSeries_get_rtc_time,
 	.calibrate_decr		= generic_calibrate_decr,
 	.progress		= iSeries_progress,
 	.probe			= iseries_probe,
 	.ioremap		= iseries_ioremap,
 	.iounmap		= iseries_iounmap,
 #ifdef CONFIG_KEXEC
 	.machine_kexec_prepare	= iseries_kexec_prepare,
 #endif
 	/* XXX Implement enable_pmcs for iSeries */
 };

 void * __init iSeries_early_setup(void)
 {
 	unsigned long phys_mem_size;

 	/* Identify CPU type. This is done again by the common code later
 	 * on but calling this function multiple times is fine.
 	 */
 	identify_cpu(0, mfspr(SPRN_PVR));

 	powerpc_firmware_features |= FW_FEATURE_ISERIES;
 	powerpc_firmware_features |= FW_FEATURE_LPAR;

 	iSeries_fixup_klimit();

 	/*
 	 * Initialize the table which translate Linux physical addresses to
 	 * AS/400 absolute addresses
 	 */
 	phys_mem_size = build_iSeries_Memory_Map();

 	iSeries_get_cmdline();

 	return (void *) __pa(build_flat_dt(phys_mem_size));
 }

 static void hvputc(char c)
 {
 	if (c == '\n')
 		hvputc('\r');

 	HvCall_writeLogBuffer(&c, 1);
 }

 void __init udbg_init_iseries(void)
 {
 	udbg_putc = hvputc;
 }
	/*
	* Copyright (c) 2000 Mike Corrigan <mikejc@us.ibm.com>
	* Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
	*
	* Description:
	* Architecture- / platform-specific boot-time initialization code for
	* the IBM iSeries LPAR. Adapted from original code by Grant Erickson and
	* code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
	* <dan@net4x.com>.
	*
	* 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.
	*/

	#undef DEBUG

	#include <linux/init.h>
	#include <linux/threads.h>
	#include <linux/smp.h>
	#include <linux/param.h>
	#include <linux/string.h>
	#include <linux/seq_file.h>
	#include <linux/kdev_t.h>
	#include <linux/kexec.h>
	#include <linux/major.h>
	#include <linux/root_dev.h>
	#include <linux/kernel.h>
	#include <linux/hrtimer.h>
	#include <linux/tick.h>

	#include <asm/processor.h>
	#include <asm/machdep.h>
	#include <asm/page.h>
	#include <asm/mmu.h>
	#include <asm/pgtable.h>
	#include <asm/mmu_context.h>
	#include <asm/cputable.h>
	#include <asm/sections.h>
	#include <asm/iommu.h>
	#include <asm/firmware.h>
	#include <asm/system.h>
	#include <asm/time.h>
	#include <asm/paca.h>
	#include <asm/cache.h>
	#include <asm/abs_addr.h>
	#include <asm/iseries/hv_lp_config.h>
	#include <asm/iseries/hv_call_event.h>
	#include <asm/iseries/hv_call_xm.h>
	#include <asm/iseries/it_lp_queue.h>
	#include <asm/iseries/mf.h>
	#include <asm/iseries/hv_lp_event.h>
	#include <asm/iseries/lpar_map.h>
	#include <asm/udbg.h>
	#include <asm/irq.h>

	#include "naca.h"
	#include "setup.h"
	#include "irq.h"
	#include "vpd_areas.h"
	#include "processor_vpd.h"
	#include "it_lp_naca.h"
	#include "main_store.h"
	#include "call_sm.h"
	#include "call_hpt.h"
	#include "pci.h"

	#ifdef DEBUG
	#define DBG(fmt...) udbg_printf(fmt)
	#else
	#define DBG(fmt...)
	#endif

	/* Function Prototypes */
	static unsigned long build_iSeries_Memory_Map(void);
	static void iseries_shared_idle(void);
	static void iseries_dedicated_idle(void);


	struct MemoryBlock {
	unsigned long absStart;
	unsigned long absEnd;
	unsigned long logicalStart;
	unsigned long logicalEnd;
	};

	/*
	* Process the main store vpd to determine where the holes in memory are
	* and return the number of physical blocks and fill in the array of
	* block data.
	*/
	static unsigned long iSeries_process_Condor_mainstore_vpd(
	struct MemoryBlock *mb_array, unsigned long max_entries)
	{
	unsigned long holeFirstChunk, holeSizeChunks;
	unsigned long numMemoryBlocks = 1;
	struct IoHriMainStoreSegment4 *msVpd =
	(struct IoHriMainStoreSegment4 *)xMsVpd;
	unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
	unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
	unsigned long holeSize = holeEnd - holeStart;

	printk("Mainstore_VPD: Condor\n");
	/*
	* Determine if absolute memory has any
	* holes so that we can interpret the
	* access map we get back from the hypervisor
	* correctly.
	*/
	mb_array[0].logicalStart = 0;
	mb_array[0].logicalEnd = 0x100000000UL;
	mb_array[0].absStart = 0;
	mb_array[0].absEnd = 0x100000000UL;

	if (holeSize) {
	numMemoryBlocks = 2;
	holeStart = holeStart & 0x000fffffffffffffUL;
	holeStart = addr_to_chunk(holeStart);
	holeFirstChunk = holeStart;
	holeSize = addr_to_chunk(holeSize);
	holeSizeChunks = holeSize;
	printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
	holeFirstChunk, holeSizeChunks );
	mb_array[0].logicalEnd = holeFirstChunk;
	mb_array[0].absEnd = holeFirstChunk;
	mb_array[1].logicalStart = holeFirstChunk;
	mb_array[1].logicalEnd = 0x100000000UL - holeSizeChunks;
	mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
	mb_array[1].absEnd = 0x100000000UL;
	}
	return numMemoryBlocks;
	}

	#define MaxSegmentAreas 32
	#define MaxSegmentAdrRangeBlocks 128
	#define MaxAreaRangeBlocks 4

	static unsigned long iSeries_process_Regatta_mainstore_vpd(
	struct MemoryBlock *mb_array, unsigned long max_entries)
	{
	struct IoHriMainStoreSegment5 *msVpdP =
	(struct IoHriMainStoreSegment5 *)xMsVpd;
	unsigned long numSegmentBlocks = 0;
	u32 existsBits = msVpdP->msAreaExists;
	unsigned long area_num;

	printk("Mainstore_VPD: Regatta\n");

	for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
	unsigned long numAreaBlocks;
	struct IoHriMainStoreArea4 *currentArea;

	if (existsBits & 0x80000000) {
	unsigned long block_num;

	currentArea = &msVpdP->msAreaArray[area_num];
	numAreaBlocks = currentArea->numAdrRangeBlocks;
	printk("ms_vpd: processing area %2ld blocks=%ld",
	area_num, numAreaBlocks);
	for (block_num = 0; block_num < numAreaBlocks;
	++block_num ) {
	/* Process an address range block */
	struct MemoryBlock tempBlock;
	unsigned long i;

	tempBlock.absStart =
	(unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
	tempBlock.absEnd =
	(unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
	tempBlock.logicalStart = 0;
	tempBlock.logicalEnd = 0;
	printk("\n block %ld absStart=%016lx absEnd=%016lx",
	block_num, tempBlock.absStart,
	tempBlock.absEnd);

	for (i = 0; i < numSegmentBlocks; ++i) {
	if (mb_array[i].absStart ==
	tempBlock.absStart)
	break;
	}
	if (i == numSegmentBlocks) {
	if (numSegmentBlocks == max_entries)
	panic("iSeries_process_mainstore_vpd: too many memory blocks");
	mb_array[numSegmentBlocks] = tempBlock;
	++numSegmentBlocks;
	} else
	printk(" (duplicate)");
	}
	printk("\n");
	}
	existsBits <<= 1;
	}
	/* Now sort the blocks found into ascending sequence */
	if (numSegmentBlocks > 1) {
	unsigned long m, n;

	for (m = 0; m < numSegmentBlocks - 1; ++m) {
	for (n = numSegmentBlocks - 1; m < n; --n) {
	if (mb_array[n].absStart <
	mb_array[n-1].absStart) {
	struct MemoryBlock tempBlock;

	tempBlock = mb_array[n];
	mb_array[n] = mb_array[n-1];
	mb_array[n-1] = tempBlock;
	}
	}
	}
	}
	/*
	* Assign "logical" addresses to each block. These
	* addresses correspond to the hypervisor "bitmap" space.
	* Convert all addresses into units of 256K chunks.
	*/
	{
	unsigned long i, nextBitmapAddress;

	printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
	nextBitmapAddress = 0;
	for (i = 0; i < numSegmentBlocks; ++i) {
	unsigned long length = mb_array[i].absEnd -
	mb_array[i].absStart;

	mb_array[i].logicalStart = nextBitmapAddress;
	mb_array[i].logicalEnd = nextBitmapAddress + length;
	nextBitmapAddress += length;
	printk(" Bitmap range: %016lx - %016lx\n"
	" Absolute range: %016lx - %016lx\n",
	mb_array[i].logicalStart,
	mb_array[i].logicalEnd,
	mb_array[i].absStart, mb_array[i].absEnd);
	mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
	0x000fffffffffffffUL);
	mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
	0x000fffffffffffffUL);
	mb_array[i].logicalStart =
	addr_to_chunk(mb_array[i].logicalStart);
	mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
	}
	}

	return numSegmentBlocks;
	}

	static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
	unsigned long max_entries)
	{
	unsigned long i;
	unsigned long mem_blocks = 0;

	if (cpu_has_feature(CPU_FTR_SLB))
	mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
	max_entries);
	else
	mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
	max_entries);

	printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
	for (i = 0; i < mem_blocks; ++i) {
	printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
	" abs chunks %016lx - %016lx\n",
	i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
	mb_array[i].absStart, mb_array[i].absEnd);
	}
	return mem_blocks;
	}

	static void __init iSeries_get_cmdline(void)
	{
	char p, q;

	/* copy the command line parameter from the primary VSP */
	HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
	HvLpDma_Direction_RemoteToLocal);

	p = cmd_line;
	q = cmd_line + 255;
	while(p < q) {
	if (!p \|\| p == '\n')
	break;
	++p;
	}
	*p = 0;
	}

	static void __init iSeries_init_early(void)
	{
	DBG(" -> iSeries_init_early()\n");

	/* Snapshot the timebase, for use in later recalibration */
	iSeries_time_init_early();

	/*
	* Initialize the DMA/TCE management
	*/
	iommu_init_early_iSeries();

	/* Initialize machine-dependency vectors */
	#ifdef CONFIG_SMP
	smp_init_iSeries();
	#endif

	/* Associate Lp Event Queue 0 with processor 0 */
	HvCallEvent_setLpEventQueueInterruptProc(0, 0);

	mf_init();

	DBG(" <- iSeries_init_early()\n");
	}

	struct mschunks_map mschunks_map = {
	/* XXX We don't use these, but Piranha might need them. */
	.chunk_size = MSCHUNKS_CHUNK_SIZE,
	.chunk_shift = MSCHUNKS_CHUNK_SHIFT,
	.chunk_mask = MSCHUNKS_OFFSET_MASK,
	};
	EXPORT_SYMBOL(mschunks_map);

	static void mschunks_alloc(unsigned long num_chunks)
	{
	klimit = _ALIGN(klimit, sizeof(u32));
	mschunks_map.mapping = (u32 *)klimit;
	klimit += num_chunks * sizeof(u32);
	mschunks_map.num_chunks = num_chunks;
	}

	/*
	* The iSeries may have very large memories ( > 128 GB ) and a partition
	* may get memory in "chunks" that may be anywhere in the 2**52 real
	* address space. The chunks are 256K in size. To map this to the
	* memory model Linux expects, the AS/400 specific code builds a
	* translation table to translate what Linux thinks are "physical"
	* addresses to the actual real addresses. This allows us to make
	* it appear to Linux that we have contiguous memory starting at
	* physical address zero while in fact this could be far from the truth.
	* To avoid confusion, I'll let the words physical and/or real address
	* apply to the Linux addresses while I'll use "absolute address" to
	* refer to the actual hardware real address.
	*
	* build_iSeries_Memory_Map gets information from the Hypervisor and
	* looks at the Main Store VPD to determine the absolute addresses
	* of the memory that has been assigned to our partition and builds
	* a table used to translate Linux's physical addresses to these
	* absolute addresses. Absolute addresses are needed when
	* communicating with the hypervisor (e.g. to build HPT entries)
	*
	* Returns the physical memory size
	*/

	static unsigned long __init build_iSeries_Memory_Map(void)
	{
	u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
	u32 nextPhysChunk;
	u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
	u32 totalChunks,moreChunks;
	u32 currChunk, thisChunk, absChunk;
	u32 currDword;
	u32 chunkBit;
	u64 map;
	struct MemoryBlock mb[32];
	unsigned long numMemoryBlocks, curBlock;

	/* Chunk size on iSeries is 256K bytes */
	totalChunks = (u32)HvLpConfig_getMsChunks();
	mschunks_alloc(totalChunks);

	/*
	* Get absolute address of our load area
	* and map it to physical address 0
	* This guarantees that the loadarea ends up at physical 0
	* otherwise, it might not be returned by PLIC as the first
	* chunks
	*/

	loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
	loadAreaSize = itLpNaca.xLoadAreaChunks;

	/*
	* Only add the pages already mapped here.
	* Otherwise we might add the hpt pages
	* The rest of the pages of the load area
	* aren't in the HPT yet and can still
	* be assigned an arbitrary physical address
	*/
	if ((loadAreaSize * 64) > HvPagesToMap)
	loadAreaSize = HvPagesToMap / 64;

	loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;

	/*
	* TODO Do we need to do something if the HPT is in the 64MB load area?
	* This would be required if the itLpNaca.xLoadAreaChunks includes
	* the HPT size
	*/

	printk("Mapping load area - physical addr = 0000000000000000\n"
	" absolute addr = %016lx\n",
	chunk_to_addr(loadAreaFirstChunk));
	printk("Load area size %dK\n", loadAreaSize * 256);

	for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
	mschunks_map.mapping[nextPhysChunk] =
	loadAreaFirstChunk + nextPhysChunk;

	/*
	* Get absolute address of our HPT and remember it so
	* we won't map it to any physical address
	*/
	hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
	hptSizePages = (u32)HvCallHpt_getHptPages();
	hptSizeChunks = hptSizePages >>
	(MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
	hptLastChunk = hptFirstChunk + hptSizeChunks - 1;

	printk("HPT absolute addr = %016lx, size = %dK\n",
	chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);

	/*
	* Determine if absolute memory has any
	* holes so that we can interpret the
	* access map we get back from the hypervisor
	* correctly.
	*/
	numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);

	/*
	* Process the main store access map from the hypervisor
	* to build up our physical -> absolute translation table
	*/
	curBlock = 0;
	currChunk = 0;
	currDword = 0;
	moreChunks = totalChunks;

	while (moreChunks) {
	map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
	currDword);
	thisChunk = currChunk;
	while (map) {
	chunkBit = map >> 63;
	map <<= 1;
	if (chunkBit) {
	--moreChunks;
	while (thisChunk >= mb[curBlock].logicalEnd) {
	++curBlock;
	if (curBlock >= numMemoryBlocks)
	panic("out of memory blocks");
	}
	if (thisChunk < mb[curBlock].logicalStart)
	panic("memory block error");

	absChunk = mb[curBlock].absStart +
	(thisChunk - mb[curBlock].logicalStart);
	if (((absChunk < hptFirstChunk) \|\|
	(absChunk > hptLastChunk)) &&
	((absChunk < loadAreaFirstChunk) \|\|
	(absChunk > loadAreaLastChunk))) {
	mschunks_map.mapping[nextPhysChunk] =
	absChunk;
	++nextPhysChunk;
	}
	}
	++thisChunk;
	}
	++currDword;
	currChunk += 64;
	}

	/*
	* main store size (in chunks) is
	* totalChunks - hptSizeChunks
	* which should be equal to
	* nextPhysChunk
	*/
	return chunk_to_addr(nextPhysChunk);
	}

	/*
	* Document me.
	*/
	static void __init iSeries_setup_arch(void)
	{
	if (get_lppaca()->shared_proc) {
	ppc_md.idle_loop = iseries_shared_idle;
	printk(KERN_DEBUG "Using shared processor idle loop\n");
	} else {
	ppc_md.idle_loop = iseries_dedicated_idle;
	printk(KERN_DEBUG "Using dedicated idle loop\n");
	}

	/* Setup the Lp Event Queue */
	setup_hvlpevent_queue();

	printk("Max logical processors = %d\n",
	itVpdAreas.xSlicMaxLogicalProcs);
	printk("Max physical processors = %d\n",
	itVpdAreas.xSlicMaxPhysicalProcs);

	iSeries_pcibios_init();
	}

	static void iSeries_show_cpuinfo(struct seq_file *m)
	{
	seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
	}

	static void __init iSeries_progress(char * st, unsigned short code)
	{
	printk("Progress: [%04x] - %s\n", (unsigned)code, st);
	mf_display_progress(code);
	}

	static void __init iSeries_fixup_klimit(void)
	{
	/*
	* Change klimit to take into account any ram disk
	* that may be included
	*/
	if (naca.xRamDisk)
	klimit = KERNELBASE + (u64)naca.xRamDisk +
	(naca.xRamDiskSize * HW_PAGE_SIZE);
	}

	static int __init iSeries_src_init(void)
	{
	/* clear the progress line */
	if (firmware_has_feature(FW_FEATURE_ISERIES))
	ppc_md.progress(" ", 0xffff);
	return 0;
	}

	late_initcall(iSeries_src_init);

	static inline void process_iSeries_events(void)
	{
	asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
	}

	static void yield_shared_processor(void)
	{
	unsigned long tb;

	HvCall_setEnabledInterrupts(HvCall_MaskIPI \|
	HvCall_MaskLpEvent \|
	HvCall_MaskLpProd \|
	HvCall_MaskTimeout);

	tb = get_tb();
	/* Compute future tb value when yield should expire */
	HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);

	/*
	* The decrementer stops during the yield. Force a fake decrementer
	* here and let the timer_interrupt code sort out the actual time.
	*/
	get_lppaca()->int_dword.fields.decr_int = 1;
	ppc64_runlatch_on();
	process_iSeries_events();
	}

	static void iseries_shared_idle(void)
	{
	while (1) {
	tick_nohz_stop_sched_tick(1);
	while (!need_resched() && !hvlpevent_is_pending()) {
	local_irq_disable();
	ppc64_runlatch_off();

	/* Recheck with irqs off */
	if (!need_resched() && !hvlpevent_is_pending())
	yield_shared_processor();

	HMT_medium();
	local_irq_enable();
	}

	ppc64_runlatch_on();
	tick_nohz_restart_sched_tick();

	if (hvlpevent_is_pending())
	process_iSeries_events();

	preempt_enable_no_resched();
	schedule();
	preempt_disable();
	}
	}

	static void iseries_dedicated_idle(void)
	{
	set_thread_flag(TIF_POLLING_NRFLAG);

	while (1) {
	tick_nohz_stop_sched_tick(1);
	if (!need_resched()) {
	while (!need_resched()) {
	ppc64_runlatch_off();
	HMT_low();

	if (hvlpevent_is_pending()) {
	HMT_medium();
	ppc64_runlatch_on();
	process_iSeries_events();
	}
	}

	HMT_medium();
	}

	ppc64_runlatch_on();
	tick_nohz_restart_sched_tick();
	preempt_enable_no_resched();
	schedule();
	preempt_disable();
	}
	}

	static void __iomem *iseries_ioremap(phys_addr_t address, unsigned long size,
	unsigned long flags)
	{
	return (void __iomem *)address;
	}

	static void iseries_iounmap(volatile void __iomem *token)
	{
	}

	static int __init iseries_probe(void)
	{
	unsigned long root = of_get_flat_dt_root();
	if (!of_flat_dt_is_compatible(root, "IBM,iSeries"))
	return 0;

	hpte_init_iSeries();
	/* iSeries does not support 16M pages */
	cur_cpu_spec->cpu_features &= ~CPU_FTR_16M_PAGE;

	return 1;
	}

	#ifdef CONFIG_KEXEC
	static int iseries_kexec_prepare(struct kimage *image)
	{
	return -ENOSYS;
	}
	#endif

	define_machine(iseries) {
	.name = "iSeries",
	.setup_arch = iSeries_setup_arch,
	.show_cpuinfo = iSeries_show_cpuinfo,
	.init_IRQ = iSeries_init_IRQ,
	.get_irq = iSeries_get_irq,
	.init_early = iSeries_init_early,
	.pcibios_fixup = iSeries_pci_final_fixup,
	.pcibios_fixup_resources= iSeries_pcibios_fixup_resources,
	.restart = mf_reboot,
	.power_off = mf_power_off,
	.halt = mf_power_off,
	.get_boot_time = iSeries_get_boot_time,
	.set_rtc_time = iSeries_set_rtc_time,
	.get_rtc_time = iSeries_get_rtc_time,
	.calibrate_decr = generic_calibrate_decr,
	.progress = iSeries_progress,
	.probe = iseries_probe,
	.ioremap = iseries_ioremap,
	.iounmap = iseries_iounmap,
	#ifdef CONFIG_KEXEC
	.machine_kexec_prepare = iseries_kexec_prepare,
	#endif
	/* XXX Implement enable_pmcs for iSeries */
	};

	void * __init iSeries_early_setup(void)
	{
	unsigned long phys_mem_size;

	/* Identify CPU type. This is done again by the common code later
	* on but calling this function multiple times is fine.
	*/
	identify_cpu(0, mfspr(SPRN_PVR));

	powerpc_firmware_features \|= FW_FEATURE_ISERIES;
	powerpc_firmware_features \|= FW_FEATURE_LPAR;

	iSeries_fixup_klimit();

	/*
	* Initialize the table which translate Linux physical addresses to
	* AS/400 absolute addresses
	*/
	phys_mem_size = build_iSeries_Memory_Map();

	iSeries_get_cmdline();

	return (void *) __pa(build_flat_dt(phys_mem_size));
	}

	static void hvputc(char c)
	{
	if (c == '\n')
	hvputc('\r');

	HvCall_writeLogBuffer(&c, 1);
	}

	void __init udbg_init_iseries(void)
	{
	udbg_putc = hvputc;
	}