diff options
Diffstat (limited to 'arch/powerpc/platforms/iseries/setup.c')
| -rw-r--r-- | arch/powerpc/platforms/iseries/setup.c | 996 |
1 files changed, 996 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c new file mode 100644 index 00000000000..1544c6f10a3 --- /dev/null +++ b/arch/powerpc/platforms/iseries/setup.c @@ -0,0 +1,996 @@ +/* + * 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/config.h> +#include <linux/init.h> +#include <linux/threads.h> +#include <linux/smp.h> +#include <linux/param.h> +#include <linux/string.h> +#include <linux/initrd.h> +#include <linux/seq_file.h> +#include <linux/kdev_t.h> +#include <linux/major.h> +#include <linux/root_dev.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/time.h> +#include <asm/naca.h> +#include <asm/paca.h> +#include <asm/cache.h> +#include <asm/sections.h> +#include <asm/abs_addr.h> +#include <asm/iSeries/HvLpConfig.h> +#include <asm/iSeries/HvCallEvent.h> +#include <asm/iSeries/HvCallXm.h> +#include <asm/iSeries/ItLpQueue.h> +#include <asm/iSeries/mf.h> +#include <asm/iSeries/HvLpEvent.h> +#include <asm/iSeries/LparMap.h> + +#include "setup.h" +#include "irq.h" +#include "vpd_areas.h" +#include "processor_vpd.h" +#include "main_store.h" +#include "call_sm.h" +#include "call_hpt.h" + +extern void hvlog(char *fmt, ...); + +#ifdef DEBUG +#define DBG(fmt...) hvlog(fmt) +#else +#define DBG(fmt...) +#endif + +/* Function Prototypes */ +extern void ppcdbg_initialize(void); + +static void build_iSeries_Memory_Map(void); +static void iseries_shared_idle(void); +static void iseries_dedicated_idle(void); +#ifdef CONFIG_PCI +extern void iSeries_pci_final_fixup(void); +#else +static void iSeries_pci_final_fixup(void) { } +#endif + +/* Global Variables */ +int piranha_simulator; + +extern int rd_size; /* Defined in drivers/block/rd.c */ +extern unsigned long klimit; +extern unsigned long embedded_sysmap_start; +extern unsigned long embedded_sysmap_end; + +extern unsigned long iSeries_recal_tb; +extern unsigned long iSeries_recal_titan; + +static int mf_initialized; + +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 = 0x100000000; + mb_array[0].absStart = 0; + mb_array[0].absEnd = 0x100000000; + + if (holeSize) { + numMemoryBlocks = 2; + holeStart = holeStart & 0x000fffffffffffff; + 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 = 0x100000000 - holeSizeChunks; + mb_array[1].absStart = holeFirstChunk + holeSizeChunks; + mb_array[1].absEnd = 0x100000000; + } + 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 & + 0x000fffffffffffff); + mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd & + 0x000fffffffffffff); + 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"); + + ppc64_firmware_features = FW_FEATURE_ISERIES; + + ppcdbg_initialize(); + + ppc64_interrupt_controller = IC_ISERIES; + +#if defined(CONFIG_BLK_DEV_INITRD) + /* + * If the init RAM disk has been configured and there is + * a non-zero starting address for it, set it up + */ + if (naca.xRamDisk) { + initrd_start = (unsigned long)__va(naca.xRamDisk); + initrd_end = initrd_start + naca.xRamDiskSize * PAGE_SIZE; + initrd_below_start_ok = 1; // ramdisk in kernel space + ROOT_DEV = Root_RAM0; + if (((rd_size * 1024) / PAGE_SIZE) < naca.xRamDiskSize) + rd_size = (naca.xRamDiskSize * PAGE_SIZE) / 1024; + } else +#endif /* CONFIG_BLK_DEV_INITRD */ + { + /* ROOT_DEV = MKDEV(VIODASD_MAJOR, 1); */ + } + + iSeries_recal_tb = get_tb(); + iSeries_recal_titan = HvCallXm_loadTod(); + + /* + * Initialize the hash table management pointers + */ + hpte_init_iSeries(); + + /* + * Initialize the DMA/TCE management + */ + iommu_init_early_iSeries(); + + iSeries_get_cmdline(); + + /* Save unparsed command line copy for /proc/cmdline */ + strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE); + + /* Parse early parameters, in particular mem=x */ + parse_early_param(); + + if (memory_limit) { + if (memory_limit < systemcfg->physicalMemorySize) + systemcfg->physicalMemorySize = memory_limit; + else { + printk("Ignoring mem=%lu >= ram_top.\n", memory_limit); + memory_limit = 0; + } + } + + /* Initialize machine-dependency vectors */ +#ifdef CONFIG_SMP + smp_init_iSeries(); +#endif + if (itLpNaca.xPirEnvironMode == 0) + piranha_simulator = 1; + + /* Associate Lp Event Queue 0 with processor 0 */ + HvCallEvent_setLpEventQueueInterruptProc(0, 0); + + mf_init(); + mf_initialized = 1; + mb(); + + /* If we were passed an initrd, set the ROOT_DEV properly if the values + * look sensible. If not, clear initrd reference. + */ +#ifdef CONFIG_BLK_DEV_INITRD + if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE && + initrd_end > initrd_start) + ROOT_DEV = Root_RAM0; + else + initrd_start = initrd_end = 0; +#endif /* CONFIG_BLK_DEV_INITRD */ + + 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); + +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) + */ + +static void __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 - PAGE_SHIFT); + hptLastChunk = hptFirstChunk + hptSizeChunks - 1; + + printk("HPT absolute addr = %016lx, size = %dK\n", + chunk_to_addr(hptFirstChunk), hptSizeChunks * 256); + + ppc64_pft_size = __ilog2(hptSizePages * PAGE_SIZE); + + /* + * The actual hashed page table is in the hypervisor, + * we have no direct access + */ + htab_address = NULL; + + /* + * 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 + */ + systemcfg->physicalMemorySize = chunk_to_addr(nextPhysChunk); +} + +/* + * Document me. + */ +static void __init iSeries_setup_arch(void) +{ + unsigned procIx = get_paca()->lppaca.dyn_hv_phys_proc_index; + + if (get_paca()->lppaca.shared_proc) { + ppc_md.idle_loop = iseries_shared_idle; + printk(KERN_INFO "Using shared processor idle loop\n"); + } else { + ppc_md.idle_loop = iseries_dedicated_idle; + printk(KERN_INFO "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); + + systemcfg->processor = xIoHriProcessorVpd[procIx].xPVR; + printk("Processor version = %x\n", systemcfg->processor); +} + +static void iSeries_show_cpuinfo(struct seq_file *m) +{ + seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n"); +} + +/* + * Document me. + * and Implement me. + */ +static int iSeries_get_irq(struct pt_regs *regs) +{ + /* -2 means ignore this interrupt */ + return -2; +} + +/* + * Document me. + */ +static void iSeries_restart(char *cmd) +{ + mf_reboot(); +} + +/* + * Document me. + */ +static void iSeries_power_off(void) +{ + mf_power_off(); +} + +/* + * Document me. + */ +static void iSeries_halt(void) +{ + mf_power_off(); +} + +static void __init iSeries_progress(char * st, unsigned short code) +{ + printk("Progress: [%04x] - %s\n", (unsigned)code, st); + if (!piranha_simulator && mf_initialized) { + if (code != 0xffff) + mf_display_progress(code); + else + mf_clear_src(); + } +} + +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 * PAGE_SIZE); + else { + /* + * No ram disk was included - check and see if there + * was an embedded system map. Change klimit to take + * into account any embedded system map + */ + if (embedded_sysmap_end) + klimit = KERNELBASE + ((embedded_sysmap_end + 4095) & + 0xfffffffffffff000); + } +} + +static int __init iSeries_src_init(void) +{ + /* clear the progress line */ + 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_paca()->lppaca.int_dword.fields.decr_int = 1; + process_iSeries_events(); +} + +static void iseries_shared_idle(void) +{ + while (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(); + + if (hvlpevent_is_pending()) + process_iSeries_events(); + + schedule(); + } +} + +static void iseries_dedicated_idle(void) +{ + long oldval; + + while (1) { + oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED); + + if (!oldval) { + set_thread_flag(TIF_POLLING_NRFLAG); + + while (!need_resched()) { + ppc64_runlatch_off(); + HMT_low(); + + if (hvlpevent_is_pending()) { + HMT_medium(); + ppc64_runlatch_on(); + process_iSeries_events(); + } + } + + HMT_medium(); + clear_thread_flag(TIF_POLLING_NRFLAG); + } else { + set_need_resched(); + } + + ppc64_runlatch_on(); + schedule(); + } +} + +#ifndef CONFIG_PCI +void __init iSeries_init_IRQ(void) { } +#endif + +static int __init iseries_probe(int platform) +{ + return PLATFORM_ISERIES_LPAR == platform; +} + +struct machdep_calls __initdata iseries_md = { + .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, + .restart = iSeries_restart, + .power_off = iSeries_power_off, + .halt = iSeries_halt, + .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, + /* XXX Implement enable_pmcs for iSeries */ +}; + +struct blob { + unsigned char data[PAGE_SIZE]; + unsigned long next; +}; + +struct iseries_flat_dt { + struct boot_param_header header; + u64 reserve_map[2]; + struct blob dt; + struct blob strings; +}; + +struct iseries_flat_dt iseries_dt; + +void dt_init(struct iseries_flat_dt *dt) +{ + dt->header.off_mem_rsvmap = + offsetof(struct iseries_flat_dt, reserve_map); + dt->header.off_dt_struct = offsetof(struct iseries_flat_dt, dt); + dt->header.off_dt_strings = offsetof(struct iseries_flat_dt, strings); + dt->header.totalsize = sizeof(struct iseries_flat_dt); + dt->header.dt_strings_size = sizeof(struct blob); + + /* There is no notion of hardware cpu id on iSeries */ + dt->header.boot_cpuid_phys = smp_processor_id(); + + dt->dt.next = (unsigned long)&dt->dt.data; + dt->strings.next = (unsigned long)&dt->strings.data; + + dt->header.magic = OF_DT_HEADER; + dt->header.version = 0x10; + dt->header.last_comp_version = 0x10; + + dt->reserve_map[0] = 0; + dt->reserve_map[1] = 0; +} + +void dt_check_blob(struct blob *b) +{ + if (b->next >= (unsigned long)&b->next) { + DBG("Ran out of space in flat device tree blob!\n"); + BUG(); + } +} + +void dt_push_u32(struct iseries_flat_dt *dt, u32 value) +{ + *((u32*)dt->dt.next) = value; + dt->dt.next += sizeof(u32); + + dt_check_blob(&dt->dt); +} + +void dt_push_u64(struct iseries_flat_dt *dt, u64 value) +{ + *((u64*)dt->dt.next) = value; + dt->dt.next += sizeof(u64); + + dt_check_blob(&dt->dt); +} + +unsigned long dt_push_bytes(struct blob *blob, char *data, int len) +{ + unsigned long start = blob->next - (unsigned long)blob->data; + + memcpy((char *)blob->next, data, len); + blob->next = _ALIGN(blob->next + len, 4); + + dt_check_blob(blob); + + return start; +} + +void dt_start_node(struct iseries_flat_dt *dt, char *name) +{ + dt_push_u32(dt, OF_DT_BEGIN_NODE); + dt_push_bytes(&dt->dt, name, strlen(name) + 1); +} + +#define dt_end_node(dt) dt_push_u32(dt, OF_DT_END_NODE) + +void dt_prop(struct iseries_flat_dt *dt, char *name, char *data, int len) +{ + unsigned long offset; + + dt_push_u32(dt, OF_DT_PROP); + + /* Length of the data */ + dt_push_u32(dt, len); + + /* Put the property name in the string blob. */ + offset = dt_push_bytes(&dt->strings, name, strlen(name) + 1); + + /* The offset of the properties name in the string blob. */ + dt_push_u32(dt, (u32)offset); + + /* The actual data. */ + dt_push_bytes(&dt->dt, data, len); +} + +void dt_prop_str(struct iseries_flat_dt *dt, char *name, char *data) +{ + dt_prop(dt, name, data, strlen(data) + 1); /* + 1 for NULL */ +} + +void dt_prop_u32(struct iseries_flat_dt *dt, char *name, u32 data) +{ + dt_prop(dt, name, (char *)&data, sizeof(u32)); +} + +void dt_prop_u64(struct iseries_flat_dt *dt, char *name, u64 data) +{ + dt_prop(dt, name, (char *)&data, sizeof(u64)); +} + +void dt_prop_u64_list(struct iseries_flat_dt *dt, char *name, u64 *data, int n) +{ + dt_prop(dt, name, (char *)data, sizeof(u64) * n); +} + +void dt_prop_empty(struct iseries_flat_dt *dt, char *name) +{ + dt_prop(dt, name, NULL, 0); +} + +void dt_cpus(struct iseries_flat_dt *dt) +{ + unsigned char buf[32]; + unsigned char *p; + unsigned int i, index; + struct IoHriProcessorVpd *d; + + /* yuck */ + snprintf(buf, 32, "PowerPC,%s", cur_cpu_spec->cpu_name); + p = strchr(buf, ' '); + if (!p) p = buf + strlen(buf); + + dt_start_node(dt, "cpus"); + dt_prop_u32(dt, "#address-cells", 1); + dt_prop_u32(dt, "#size-cells", 0); + + for (i = 0; i < NR_CPUS; i++) { + if (paca[i].lppaca.dyn_proc_status >= 2) + continue; + + snprintf(p, 32 - (p - buf), "@%d", i); + dt_start_node(dt, buf); + + dt_prop_str(dt, "device_type", "cpu"); + + index = paca[i].lppaca.dyn_hv_phys_proc_index; + d = &xIoHriProcessorVpd[index]; + + dt_prop_u32(dt, "i-cache-size", d->xInstCacheSize * 1024); + dt_prop_u32(dt, "i-cache-line-size", d->xInstCacheOperandSize); + + dt_prop_u32(dt, "d-cache-size", d->xDataL1CacheSizeKB * 1024); + dt_prop_u32(dt, "d-cache-line-size", d->xDataCacheOperandSize); + + /* magic conversions to Hz copied from old code */ + dt_prop_u32(dt, "clock-frequency", + ((1UL << 34) * 1000000) / d->xProcFreq); + dt_prop_u32(dt, "timebase-frequency", + ((1UL << 32) * 1000000) / d->xTimeBaseFreq); + + dt_prop_u32(dt, "reg", i); + + dt_end_node(dt); + } + + dt_end_node(dt); +} + +void build_flat_dt(struct iseries_flat_dt *dt) +{ + u64 tmp[2]; + + dt_init(dt); + + dt_start_node(dt, ""); + + dt_prop_u32(dt, "#address-cells", 2); + dt_prop_u32(dt, "#size-cells", 2); + + /* /memory */ + dt_start_node(dt, "memory@0"); + dt_prop_str(dt, "name", "memory"); + dt_prop_str(dt, "device_type", "memory"); + tmp[0] = 0; + tmp[1] = systemcfg->physicalMemorySize; + dt_prop_u64_list(dt, "reg", tmp, 2); + dt_end_node(dt); + + /* /chosen */ + dt_start_node(dt, "chosen"); + dt_prop_u32(dt, "linux,platform", PLATFORM_ISERIES_LPAR); + dt_end_node(dt); + + dt_cpus(dt); + + dt_end_node(dt); + + dt_push_u32(dt, OF_DT_END); +} + +void * __init iSeries_early_setup(void) +{ + iSeries_fixup_klimit(); + + /* + * Initialize the table which translate Linux physical addresses to + * AS/400 absolute addresses + */ + build_iSeries_Memory_Map(); + + build_flat_dt(&iseries_dt); + + return (void *) __pa(&iseries_dt); +} |