| /* |
| * 64-bit pSeries and RS/6000 setup code. |
| * |
| * Copyright (C) 1995 Linus Torvalds |
| * Adapted from 'alpha' version by Gary Thomas |
| * Modified by Cort Dougan (cort@cs.nmt.edu) |
| * Modified by PPC64 Team, IBM Corp |
| * |
| * 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. |
| */ |
| |
| /* |
| * bootup setup stuff.. |
| */ |
| |
| #include <linux/cpu.h> |
| #include <linux/errno.h> |
| #include <linux/sched.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/stddef.h> |
| #include <linux/unistd.h> |
| #include <linux/user.h> |
| #include <linux/tty.h> |
| #include <linux/major.h> |
| #include <linux/interrupt.h> |
| #include <linux/reboot.h> |
| #include <linux/init.h> |
| #include <linux/ioport.h> |
| #include <linux/console.h> |
| #include <linux/pci.h> |
| #include <linux/utsname.h> |
| #include <linux/adb.h> |
| #include <linux/export.h> |
| #include <linux/delay.h> |
| #include <linux/irq.h> |
| #include <linux/seq_file.h> |
| #include <linux/root_dev.h> |
| #include <linux/cpuidle.h> |
| |
| #include <asm/mmu.h> |
| #include <asm/processor.h> |
| #include <asm/io.h> |
| #include <asm/pgtable.h> |
| #include <asm/prom.h> |
| #include <asm/rtas.h> |
| #include <asm/pci-bridge.h> |
| #include <asm/iommu.h> |
| #include <asm/dma.h> |
| #include <asm/machdep.h> |
| #include <asm/irq.h> |
| #include <asm/time.h> |
| #include <asm/nvram.h> |
| #include <asm/pmc.h> |
| #include <asm/mpic.h> |
| #include <asm/xics.h> |
| #include <asm/ppc-pci.h> |
| #include <asm/i8259.h> |
| #include <asm/udbg.h> |
| #include <asm/smp.h> |
| #include <asm/firmware.h> |
| #include <asm/eeh.h> |
| #include <asm/pSeries_reconfig.h> |
| |
| #include "plpar_wrappers.h" |
| #include "pseries.h" |
| |
| int CMO_PrPSP = -1; |
| int CMO_SecPSP = -1; |
| unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT); |
| EXPORT_SYMBOL(CMO_PageSize); |
| |
| int fwnmi_active; /* TRUE if an FWNMI handler is present */ |
| |
| static struct device_node *pSeries_mpic_node; |
| |
| static void pSeries_show_cpuinfo(struct seq_file *m) |
| { |
| struct device_node *root; |
| const char *model = ""; |
| |
| root = of_find_node_by_path("/"); |
| if (root) |
| model = of_get_property(root, "model", NULL); |
| seq_printf(m, "machine\t\t: CHRP %s\n", model); |
| of_node_put(root); |
| } |
| |
| /* Initialize firmware assisted non-maskable interrupts if |
| * the firmware supports this feature. |
| */ |
| static void __init fwnmi_init(void) |
| { |
| unsigned long system_reset_addr, machine_check_addr; |
| |
| int ibm_nmi_register = rtas_token("ibm,nmi-register"); |
| if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE) |
| return; |
| |
| /* If the kernel's not linked at zero we point the firmware at low |
| * addresses anyway, and use a trampoline to get to the real code. */ |
| system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START; |
| machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START; |
| |
| if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr, |
| machine_check_addr)) |
| fwnmi_active = 1; |
| } |
| |
| static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc) |
| { |
| struct irq_chip *chip = irq_desc_get_chip(desc); |
| unsigned int cascade_irq = i8259_irq(); |
| |
| if (cascade_irq != NO_IRQ) |
| generic_handle_irq(cascade_irq); |
| |
| chip->irq_eoi(&desc->irq_data); |
| } |
| |
| static void __init pseries_setup_i8259_cascade(void) |
| { |
| struct device_node *np, *old, *found = NULL; |
| unsigned int cascade; |
| const u32 *addrp; |
| unsigned long intack = 0; |
| int naddr; |
| |
| for_each_node_by_type(np, "interrupt-controller") { |
| if (of_device_is_compatible(np, "chrp,iic")) { |
| found = np; |
| break; |
| } |
| } |
| |
| if (found == NULL) { |
| printk(KERN_DEBUG "pic: no ISA interrupt controller\n"); |
| return; |
| } |
| |
| cascade = irq_of_parse_and_map(found, 0); |
| if (cascade == NO_IRQ) { |
| printk(KERN_ERR "pic: failed to map cascade interrupt"); |
| return; |
| } |
| pr_debug("pic: cascade mapped to irq %d\n", cascade); |
| |
| for (old = of_node_get(found); old != NULL ; old = np) { |
| np = of_get_parent(old); |
| of_node_put(old); |
| if (np == NULL) |
| break; |
| if (strcmp(np->name, "pci") != 0) |
| continue; |
| addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL); |
| if (addrp == NULL) |
| continue; |
| naddr = of_n_addr_cells(np); |
| intack = addrp[naddr-1]; |
| if (naddr > 1) |
| intack |= ((unsigned long)addrp[naddr-2]) << 32; |
| } |
| if (intack) |
| printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack); |
| i8259_init(found, intack); |
| of_node_put(found); |
| irq_set_chained_handler(cascade, pseries_8259_cascade); |
| } |
| |
| static void __init pseries_mpic_init_IRQ(void) |
| { |
| struct device_node *np; |
| const unsigned int *opprop; |
| unsigned long openpic_addr = 0; |
| int naddr, n, i, opplen; |
| struct mpic *mpic; |
| |
| np = of_find_node_by_path("/"); |
| naddr = of_n_addr_cells(np); |
| opprop = of_get_property(np, "platform-open-pic", &opplen); |
| if (opprop != 0) { |
| openpic_addr = of_read_number(opprop, naddr); |
| printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr); |
| } |
| of_node_put(np); |
| |
| BUG_ON(openpic_addr == 0); |
| |
| /* Setup the openpic driver */ |
| mpic = mpic_alloc(pSeries_mpic_node, openpic_addr, |
| MPIC_NO_RESET, 16, 0, " MPIC "); |
| BUG_ON(mpic == NULL); |
| |
| /* Add ISUs */ |
| opplen /= sizeof(u32); |
| for (n = 0, i = naddr; i < opplen; i += naddr, n++) { |
| unsigned long isuaddr = of_read_number(opprop + i, naddr); |
| mpic_assign_isu(mpic, n, isuaddr); |
| } |
| |
| /* Setup top-level get_irq */ |
| ppc_md.get_irq = mpic_get_irq; |
| |
| /* All ISUs are setup, complete initialization */ |
| mpic_init(mpic); |
| |
| /* Look for cascade */ |
| pseries_setup_i8259_cascade(); |
| } |
| |
| static void __init pseries_xics_init_IRQ(void) |
| { |
| xics_init(); |
| pseries_setup_i8259_cascade(); |
| } |
| |
| static void pseries_lpar_enable_pmcs(void) |
| { |
| unsigned long set, reset; |
| |
| set = 1UL << 63; |
| reset = 0; |
| plpar_hcall_norets(H_PERFMON, set, reset); |
| } |
| |
| static void __init pseries_discover_pic(void) |
| { |
| struct device_node *np; |
| const char *typep; |
| |
| for (np = NULL; (np = of_find_node_by_name(np, |
| "interrupt-controller"));) { |
| typep = of_get_property(np, "compatible", NULL); |
| if (strstr(typep, "open-pic")) { |
| pSeries_mpic_node = of_node_get(np); |
| ppc_md.init_IRQ = pseries_mpic_init_IRQ; |
| setup_kexec_cpu_down_mpic(); |
| smp_init_pseries_mpic(); |
| return; |
| } else if (strstr(typep, "ppc-xicp")) { |
| ppc_md.init_IRQ = pseries_xics_init_IRQ; |
| setup_kexec_cpu_down_xics(); |
| smp_init_pseries_xics(); |
| return; |
| } |
| } |
| printk(KERN_ERR "pSeries_discover_pic: failed to recognize" |
| " interrupt-controller\n"); |
| } |
| |
| static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node) |
| { |
| struct device_node *np = node; |
| struct pci_dn *pci = NULL; |
| int err = NOTIFY_OK; |
| |
| switch (action) { |
| case PSERIES_RECONFIG_ADD: |
| pci = np->parent->data; |
| if (pci) { |
| update_dn_pci_info(np, pci->phb); |
| |
| /* Create EEH device for the OF node */ |
| eeh_dev_init(np, pci->phb); |
| } |
| break; |
| default: |
| err = NOTIFY_DONE; |
| break; |
| } |
| return err; |
| } |
| |
| static struct notifier_block pci_dn_reconfig_nb = { |
| .notifier_call = pci_dn_reconfig_notifier, |
| }; |
| |
| struct kmem_cache *dtl_cache; |
| |
| #ifdef CONFIG_VIRT_CPU_ACCOUNTING |
| /* |
| * Allocate space for the dispatch trace log for all possible cpus |
| * and register the buffers with the hypervisor. This is used for |
| * computing time stolen by the hypervisor. |
| */ |
| static int alloc_dispatch_logs(void) |
| { |
| int cpu, ret; |
| struct paca_struct *pp; |
| struct dtl_entry *dtl; |
| |
| if (!firmware_has_feature(FW_FEATURE_SPLPAR)) |
| return 0; |
| |
| if (!dtl_cache) |
| return 0; |
| |
| for_each_possible_cpu(cpu) { |
| pp = &paca[cpu]; |
| dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL); |
| if (!dtl) { |
| pr_warn("Failed to allocate dispatch trace log for cpu %d\n", |
| cpu); |
| pr_warn("Stolen time statistics will be unreliable\n"); |
| break; |
| } |
| |
| pp->dtl_ridx = 0; |
| pp->dispatch_log = dtl; |
| pp->dispatch_log_end = dtl + N_DISPATCH_LOG; |
| pp->dtl_curr = dtl; |
| } |
| |
| /* Register the DTL for the current (boot) cpu */ |
| dtl = get_paca()->dispatch_log; |
| get_paca()->dtl_ridx = 0; |
| get_paca()->dtl_curr = dtl; |
| get_paca()->lppaca_ptr->dtl_idx = 0; |
| |
| /* hypervisor reads buffer length from this field */ |
| dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES; |
| ret = register_dtl(hard_smp_processor_id(), __pa(dtl)); |
| if (ret) |
| pr_err("WARNING: DTL registration of cpu %d (hw %d) failed " |
| "with %d\n", smp_processor_id(), |
| hard_smp_processor_id(), ret); |
| get_paca()->lppaca_ptr->dtl_enable_mask = 2; |
| |
| return 0; |
| } |
| #else /* !CONFIG_VIRT_CPU_ACCOUNTING */ |
| static inline int alloc_dispatch_logs(void) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_VIRT_CPU_ACCOUNTING */ |
| |
| static int alloc_dispatch_log_kmem_cache(void) |
| { |
| dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES, |
| DISPATCH_LOG_BYTES, 0, NULL); |
| if (!dtl_cache) { |
| pr_warn("Failed to create dispatch trace log buffer cache\n"); |
| pr_warn("Stolen time statistics will be unreliable\n"); |
| return 0; |
| } |
| |
| return alloc_dispatch_logs(); |
| } |
| early_initcall(alloc_dispatch_log_kmem_cache); |
| |
| static void pSeries_idle(void) |
| { |
| /* This would call on the cpuidle framework, and the back-end pseries |
| * driver to go to idle states |
| */ |
| if (cpuidle_idle_call()) { |
| /* On error, execute default handler |
| * to go into low thread priority and possibly |
| * low power mode. |
| */ |
| HMT_low(); |
| HMT_very_low(); |
| } |
| } |
| |
| static void __init pSeries_setup_arch(void) |
| { |
| panic_timeout = 10; |
| |
| /* Discover PIC type and setup ppc_md accordingly */ |
| pseries_discover_pic(); |
| |
| /* openpic global configuration register (64-bit format). */ |
| /* openpic Interrupt Source Unit pointer (64-bit format). */ |
| /* python0 facility area (mmio) (64-bit format) REAL address. */ |
| |
| /* init to some ~sane value until calibrate_delay() runs */ |
| loops_per_jiffy = 50000000; |
| |
| fwnmi_init(); |
| |
| /* By default, only probe PCI (can be overriden by rtas_pci) */ |
| pci_add_flags(PCI_PROBE_ONLY); |
| |
| /* Find and initialize PCI host bridges */ |
| init_pci_config_tokens(); |
| eeh_pseries_init(); |
| find_and_init_phbs(); |
| pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb); |
| eeh_init(); |
| |
| pSeries_nvram_init(); |
| |
| if (firmware_has_feature(FW_FEATURE_SPLPAR)) { |
| vpa_init(boot_cpuid); |
| ppc_md.power_save = pSeries_idle; |
| } |
| |
| if (firmware_has_feature(FW_FEATURE_LPAR)) |
| ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; |
| else |
| ppc_md.enable_pmcs = power4_enable_pmcs; |
| } |
| |
| static int __init pSeries_init_panel(void) |
| { |
| /* Manually leave the kernel version on the panel. */ |
| ppc_md.progress("Linux ppc64\n", 0); |
| ppc_md.progress(init_utsname()->version, 0); |
| |
| return 0; |
| } |
| machine_arch_initcall(pseries, pSeries_init_panel); |
| |
| static int pseries_set_dabr(unsigned long dabr) |
| { |
| return plpar_hcall_norets(H_SET_DABR, dabr); |
| } |
| |
| static int pseries_set_xdabr(unsigned long dabr) |
| { |
| /* We want to catch accesses from kernel and userspace */ |
| return plpar_hcall_norets(H_SET_XDABR, dabr, |
| H_DABRX_KERNEL | H_DABRX_USER); |
| } |
| |
| #define CMO_CHARACTERISTICS_TOKEN 44 |
| #define CMO_MAXLENGTH 1026 |
| |
| void pSeries_coalesce_init(void) |
| { |
| struct hvcall_mpp_x_data mpp_x_data; |
| |
| if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data)) |
| powerpc_firmware_features |= FW_FEATURE_XCMO; |
| else |
| powerpc_firmware_features &= ~FW_FEATURE_XCMO; |
| } |
| |
| /** |
| * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, |
| * handle that here. (Stolen from parse_system_parameter_string) |
| */ |
| void pSeries_cmo_feature_init(void) |
| { |
| char *ptr, *key, *value, *end; |
| int call_status; |
| int page_order = IOMMU_PAGE_SHIFT; |
| |
| pr_debug(" -> fw_cmo_feature_init()\n"); |
| spin_lock(&rtas_data_buf_lock); |
| memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); |
| call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, |
| NULL, |
| CMO_CHARACTERISTICS_TOKEN, |
| __pa(rtas_data_buf), |
| RTAS_DATA_BUF_SIZE); |
| |
| if (call_status != 0) { |
| spin_unlock(&rtas_data_buf_lock); |
| pr_debug("CMO not available\n"); |
| pr_debug(" <- fw_cmo_feature_init()\n"); |
| return; |
| } |
| |
| end = rtas_data_buf + CMO_MAXLENGTH - 2; |
| ptr = rtas_data_buf + 2; /* step over strlen value */ |
| key = value = ptr; |
| |
| while (*ptr && (ptr <= end)) { |
| /* Separate the key and value by replacing '=' with '\0' and |
| * point the value at the string after the '=' |
| */ |
| if (ptr[0] == '=') { |
| ptr[0] = '\0'; |
| value = ptr + 1; |
| } else if (ptr[0] == '\0' || ptr[0] == ',') { |
| /* Terminate the string containing the key/value pair */ |
| ptr[0] = '\0'; |
| |
| if (key == value) { |
| pr_debug("Malformed key/value pair\n"); |
| /* Never found a '=', end processing */ |
| break; |
| } |
| |
| if (0 == strcmp(key, "CMOPageSize")) |
| page_order = simple_strtol(value, NULL, 10); |
| else if (0 == strcmp(key, "PrPSP")) |
| CMO_PrPSP = simple_strtol(value, NULL, 10); |
| else if (0 == strcmp(key, "SecPSP")) |
| CMO_SecPSP = simple_strtol(value, NULL, 10); |
| value = key = ptr + 1; |
| } |
| ptr++; |
| } |
| |
| /* Page size is returned as the power of 2 of the page size, |
| * convert to the page size in bytes before returning |
| */ |
| CMO_PageSize = 1 << page_order; |
| pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); |
| |
| if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { |
| pr_info("CMO enabled\n"); |
| pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, |
| CMO_SecPSP); |
| powerpc_firmware_features |= FW_FEATURE_CMO; |
| pSeries_coalesce_init(); |
| } else |
| pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, |
| CMO_SecPSP); |
| spin_unlock(&rtas_data_buf_lock); |
| pr_debug(" <- fw_cmo_feature_init()\n"); |
| } |
| |
| /* |
| * Early initialization. Relocation is on but do not reference unbolted pages |
| */ |
| static void __init pSeries_init_early(void) |
| { |
| pr_debug(" -> pSeries_init_early()\n"); |
| |
| #ifdef CONFIG_HVC_CONSOLE |
| if (firmware_has_feature(FW_FEATURE_LPAR)) |
| hvc_vio_init_early(); |
| #endif |
| if (firmware_has_feature(FW_FEATURE_XDABR)) |
| ppc_md.set_dabr = pseries_set_xdabr; |
| else if (firmware_has_feature(FW_FEATURE_DABR)) |
| ppc_md.set_dabr = pseries_set_dabr; |
| |
| pSeries_cmo_feature_init(); |
| iommu_init_early_pSeries(); |
| |
| pr_debug(" <- pSeries_init_early()\n"); |
| } |
| |
| /* |
| * Called very early, MMU is off, device-tree isn't unflattened |
| */ |
| |
| static int __init pSeries_probe_hypertas(unsigned long node, |
| const char *uname, int depth, |
| void *data) |
| { |
| const char *hypertas; |
| unsigned long len; |
| |
| if (depth != 1 || |
| (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0)) |
| return 0; |
| |
| hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len); |
| if (!hypertas) |
| return 1; |
| |
| powerpc_firmware_features |= FW_FEATURE_LPAR; |
| fw_feature_init(hypertas, len); |
| |
| return 1; |
| } |
| |
| static int __init pSeries_probe(void) |
| { |
| unsigned long root = of_get_flat_dt_root(); |
| char *dtype = of_get_flat_dt_prop(root, "device_type", NULL); |
| |
| if (dtype == NULL) |
| return 0; |
| if (strcmp(dtype, "chrp")) |
| return 0; |
| |
| /* Cell blades firmware claims to be chrp while it's not. Until this |
| * is fixed, we need to avoid those here. |
| */ |
| if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || |
| of_flat_dt_is_compatible(root, "IBM,CBEA")) |
| return 0; |
| |
| pr_debug("pSeries detected, looking for LPAR capability...\n"); |
| |
| /* Now try to figure out if we are running on LPAR */ |
| of_scan_flat_dt(pSeries_probe_hypertas, NULL); |
| |
| if (firmware_has_feature(FW_FEATURE_LPAR)) |
| hpte_init_lpar(); |
| else |
| hpte_init_native(); |
| |
| pr_debug("Machine is%s LPAR !\n", |
| (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); |
| |
| return 1; |
| } |
| |
| static int pSeries_pci_probe_mode(struct pci_bus *bus) |
| { |
| if (firmware_has_feature(FW_FEATURE_LPAR)) |
| return PCI_PROBE_DEVTREE; |
| return PCI_PROBE_NORMAL; |
| } |
| |
| /** |
| * pSeries_power_off - tell firmware about how to power off the system. |
| * |
| * This function calls either the power-off rtas token in normal cases |
| * or the ibm,power-off-ups token (if present & requested) in case of |
| * a power failure. If power-off token is used, power on will only be |
| * possible with power button press. If ibm,power-off-ups token is used |
| * it will allow auto poweron after power is restored. |
| */ |
| static void pSeries_power_off(void) |
| { |
| int rc; |
| int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); |
| |
| if (rtas_flash_term_hook) |
| rtas_flash_term_hook(SYS_POWER_OFF); |
| |
| if (rtas_poweron_auto == 0 || |
| rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { |
| rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); |
| printk(KERN_INFO "RTAS power-off returned %d\n", rc); |
| } else { |
| rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); |
| printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); |
| } |
| for (;;); |
| } |
| |
| #ifndef CONFIG_PCI |
| void pSeries_final_fixup(void) { } |
| #endif |
| |
| define_machine(pseries) { |
| .name = "pSeries", |
| .probe = pSeries_probe, |
| .setup_arch = pSeries_setup_arch, |
| .init_early = pSeries_init_early, |
| .show_cpuinfo = pSeries_show_cpuinfo, |
| .log_error = pSeries_log_error, |
| .pcibios_fixup = pSeries_final_fixup, |
| .pci_probe_mode = pSeries_pci_probe_mode, |
| .restart = rtas_restart, |
| .power_off = pSeries_power_off, |
| .halt = rtas_halt, |
| .panic = rtas_os_term, |
| .get_boot_time = rtas_get_boot_time, |
| .get_rtc_time = rtas_get_rtc_time, |
| .set_rtc_time = rtas_set_rtc_time, |
| .calibrate_decr = generic_calibrate_decr, |
| .progress = rtas_progress, |
| .system_reset_exception = pSeries_system_reset_exception, |
| .machine_check_exception = pSeries_machine_check_exception, |
| }; |