2 * 64-bit pSeries and RS/6000 setup code.
4 * Copyright (C) 1995 Linus Torvalds
5 * Adapted from 'alpha' version by Gary Thomas
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * Modified by PPC64 Team, IBM Corp
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
16 * bootup setup stuff..
21 #include <linux/config.h>
22 #include <linux/cpu.h>
23 #include <linux/errno.h>
24 #include <linux/sched.h>
25 #include <linux/kernel.h>
27 #include <linux/stddef.h>
28 #include <linux/unistd.h>
29 #include <linux/slab.h>
30 #include <linux/user.h>
31 #include <linux/a.out.h>
32 #include <linux/tty.h>
33 #include <linux/major.h>
34 #include <linux/interrupt.h>
35 #include <linux/reboot.h>
36 #include <linux/init.h>
37 #include <linux/ioport.h>
38 #include <linux/console.h>
39 #include <linux/pci.h>
40 #include <linux/utsname.h>
41 #include <linux/adb.h>
42 #include <linux/module.h>
43 #include <linux/delay.h>
44 #include <linux/irq.h>
45 #include <linux/seq_file.h>
46 #include <linux/root_dev.h>
49 #include <asm/processor.h>
51 #include <asm/pgtable.h>
54 #include <asm/pci-bridge.h>
55 #include <asm/iommu.h>
57 #include <asm/machdep.h>
59 #include <asm/kexec.h>
61 #include <asm/nvram.h>
63 #include <asm/firmware.h>
66 #include <asm/ppc-pci.h>
67 #include <asm/i8259.h>
71 #include "plpar_wrappers.h"
74 #define DBG(fmt...) udbg_printf(fmt)
79 extern void find_udbg_vterm(void);
81 int fwnmi_active; /* TRUE if an FWNMI handler is present */
83 extern void pSeries_system_reset_exception(struct pt_regs *regs);
84 extern int pSeries_machine_check_exception(struct pt_regs *regs);
86 static void pseries_shared_idle(void);
87 static void pseries_dedicated_idle(void);
89 struct mpic *pSeries_mpic;
91 void pSeries_show_cpuinfo(struct seq_file *m)
93 struct device_node *root;
94 const char *model = "";
96 root = of_find_node_by_path("/");
98 model = get_property(root, "model", NULL);
99 seq_printf(m, "machine\t\t: CHRP %s\n", model);
103 /* Initialize firmware assisted non-maskable interrupts if
104 * the firmware supports this feature.
106 static void __init fwnmi_init(void)
108 unsigned long system_reset_addr, machine_check_addr;
110 int ibm_nmi_register = rtas_token("ibm,nmi-register");
111 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
114 /* If the kernel's not linked at zero we point the firmware at low
115 * addresses anyway, and use a trampoline to get to the real code. */
116 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
117 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
119 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
124 static void __init pSeries_init_mpic(void)
127 struct device_node *np;
128 unsigned long intack = 0;
130 /* All ISUs are setup, complete initialization */
131 mpic_init(pSeries_mpic);
133 /* Check what kind of cascade ACK we have */
134 if (!(np = of_find_node_by_name(NULL, "pci"))
135 || !(addrp = (unsigned int *)
136 get_property(np, "8259-interrupt-acknowledge", NULL)))
137 printk(KERN_ERR "Cannot find pci to get ack address\n");
139 intack = addrp[prom_n_addr_cells(np)-1];
142 /* Setup the legacy interrupts & controller */
143 i8259_init(intack, 0);
145 /* Hook cascade to mpic */
146 mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
149 static void __init pSeries_setup_mpic(void)
151 unsigned int *opprop;
152 unsigned long openpic_addr = 0;
153 unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
154 struct device_node *root;
157 /* Find the Open PIC if present */
158 root = of_find_node_by_path("/");
159 opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
161 int n = prom_n_addr_cells(root);
163 for (openpic_addr = 0; n > 0; --n)
164 openpic_addr = (openpic_addr << 32) + *opprop++;
165 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
169 BUG_ON(openpic_addr == 0);
171 /* Get the sense values from OF */
172 prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
174 /* Setup the openpic driver */
175 irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
176 pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
177 16, 16, irq_count, /* isu size, irq offset, irq count */
178 NR_IRQS - 4, /* ipi offset */
179 senses, irq_count, /* sense & sense size */
183 static void pseries_lpar_enable_pmcs(void)
185 unsigned long set, reset;
187 power4_enable_pmcs();
191 plpar_hcall_norets(H_PERFMON, set, reset);
193 /* instruct hypervisor to maintain PMCs */
194 if (firmware_has_feature(FW_FEATURE_SPLPAR))
195 get_paca()->lppaca.pmcregs_in_use = 1;
198 static void __init pSeries_setup_arch(void)
200 /* Fixup ppc_md depending on the type of interrupt controller */
201 if (ppc64_interrupt_controller == IC_OPEN_PIC) {
202 ppc_md.init_IRQ = pSeries_init_mpic;
203 ppc_md.get_irq = mpic_get_irq;
204 /* Allocate the mpic now, so that find_and_init_phbs() can
206 pSeries_setup_mpic();
208 ppc_md.init_IRQ = xics_init_IRQ;
209 ppc_md.get_irq = xics_get_irq;
215 /* openpic global configuration register (64-bit format). */
216 /* openpic Interrupt Source Unit pointer (64-bit format). */
217 /* python0 facility area (mmio) (64-bit format) REAL address. */
219 /* init to some ~sane value until calibrate_delay() runs */
220 loops_per_jiffy = 50000000;
223 printk("No ramdisk, default root is /dev/sda2\n");
224 ROOT_DEV = Root_SDA2;
229 /* Find and initialize PCI host bridges */
230 init_pci_config_tokens();
231 find_and_init_phbs();
234 pSeries_nvram_init();
236 /* Choose an idle loop */
237 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
238 vpa_init(boot_cpuid);
239 if (get_paca()->lppaca.shared_proc) {
240 printk(KERN_INFO "Using shared processor idle loop\n");
241 ppc_md.idle_loop = pseries_shared_idle;
243 printk(KERN_INFO "Using dedicated idle loop\n");
244 ppc_md.idle_loop = pseries_dedicated_idle;
247 printk(KERN_INFO "Using default idle loop\n");
248 ppc_md.idle_loop = default_idle;
251 if (platform_is_lpar())
252 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
254 ppc_md.enable_pmcs = power4_enable_pmcs;
257 static int __init pSeries_init_panel(void)
259 /* Manually leave the kernel version on the panel. */
260 ppc_md.progress("Linux ppc64\n", 0);
261 ppc_md.progress(system_utsname.version, 0);
265 arch_initcall(pSeries_init_panel);
268 /* Build up the ppc64_firmware_features bitmask field
269 * using contents of device-tree/ibm,hypertas-functions.
270 * Ultimately this functionality may be moved into prom.c prom_init().
272 static void __init fw_feature_init(void)
274 struct device_node * dn;
278 DBG(" -> fw_feature_init()\n");
280 ppc64_firmware_features = 0;
281 dn = of_find_node_by_path("/rtas");
283 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
287 hypertas = get_property(dn, "ibm,hypertas-functions", &len);
291 /* check value against table of strings */
292 for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
293 if ((firmware_features_table[i].name) &&
294 (strcmp(firmware_features_table[i].name,hypertas))==0) {
295 /* we have a match */
296 ppc64_firmware_features |=
297 (firmware_features_table[i].val);
301 hypertas_len = strlen(hypertas);
302 len -= hypertas_len +1;
303 hypertas+= hypertas_len +1;
310 DBG(" <- fw_feature_init()\n");
314 static void __init pSeries_discover_pic(void)
316 struct device_node *np;
320 * Setup interrupt mapping options that are needed for finish_device_tree
321 * to properly parse the OF interrupt tree & do the virtual irq mapping
323 __irq_offset_value = NUM_ISA_INTERRUPTS;
324 ppc64_interrupt_controller = IC_INVALID;
325 for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
326 typep = (char *)get_property(np, "compatible", NULL);
327 if (strstr(typep, "open-pic")) {
328 ppc64_interrupt_controller = IC_OPEN_PIC;
330 } else if (strstr(typep, "ppc-xicp")) {
331 ppc64_interrupt_controller = IC_PPC_XIC;
335 if (ppc64_interrupt_controller == IC_INVALID)
336 printk("pSeries_discover_pic: failed to recognize"
337 " interrupt-controller\n");
341 static void pSeries_mach_cpu_die(void)
345 /* Some hardware requires clearing the CPPR, while other hardware does not
346 * it is safe either way
348 pSeriesLP_cppr_info(0, 0);
350 /* Should never get here... */
355 static int pseries_set_dabr(unsigned long dabr)
357 return plpar_hcall_norets(H_SET_DABR, dabr);
360 static int pseries_set_xdabr(unsigned long dabr)
362 /* We want to catch accesses from kernel and userspace */
363 return plpar_hcall_norets(H_SET_XDABR, dabr,
364 H_DABRX_KERNEL | H_DABRX_USER);
368 * Early initialization. Relocation is on but do not reference unbolted pages
370 static void __init pSeries_init_early(void)
374 DBG(" -> pSeries_init_early()\n");
378 if (platform_is_lpar())
382 iommu_off = (of_chosen &&
383 get_property(of_chosen, "linux,iommu-off", NULL));
386 if (platform_is_lpar())
389 if (firmware_has_feature(FW_FEATURE_DABR))
390 ppc_md.set_dabr = pseries_set_dabr;
391 else if (firmware_has_feature(FW_FEATURE_XDABR))
392 ppc_md.set_dabr = pseries_set_xdabr;
394 iommu_init_early_pSeries();
396 pSeries_discover_pic();
398 DBG(" <- pSeries_init_early()\n");
402 static int pSeries_check_legacy_ioport(unsigned int baseport)
404 struct device_node *np;
406 #define I8042_DATA_REG 0x60
407 #define FDC_BASE 0x3f0
412 np = of_find_node_by_type(NULL, "8042");
418 np = of_find_node_by_type(NULL, "fdc");
428 * Called very early, MMU is off, device-tree isn't unflattened
430 extern struct machdep_calls pSeries_md;
432 static int __init pSeries_probe(int platform)
434 if (platform != PLATFORM_PSERIES &&
435 platform != PLATFORM_PSERIES_LPAR)
438 /* if we have some ppc_md fixups for LPAR to do, do
445 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
447 static inline void dedicated_idle_sleep(unsigned int cpu)
449 struct paca_struct *ppaca = &paca[cpu ^ 1];
451 /* Only sleep if the other thread is not idle */
452 if (!(ppaca->lppaca.idle)) {
456 * We are about to sleep the thread and so wont be polling any
459 clear_thread_flag(TIF_POLLING_NRFLAG);
460 smp_mb__after_clear_bit();
463 * SMT dynamic mode. Cede will result in this thread going
464 * dormant, if the partner thread is still doing work. Thread
465 * wakes up if partner goes idle, an interrupt is presented, or
466 * a prod occurs. Returning from the cede enables external
473 set_thread_flag(TIF_POLLING_NRFLAG);
476 * Give the HV an opportunity at the processor, since we are
477 * not doing any work.
483 static void pseries_dedicated_idle(void)
485 struct paca_struct *lpaca = get_paca();
486 unsigned int cpu = smp_processor_id();
487 unsigned long start_snooze;
488 unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
489 set_thread_flag(TIF_POLLING_NRFLAG);
493 * Indicate to the HV that we are idle. Now would be
494 * a good time to find other work to dispatch.
496 lpaca->lppaca.idle = 1;
498 if (!need_resched()) {
499 start_snooze = get_tb() +
500 *smt_snooze_delay * tb_ticks_per_usec;
502 while (!need_resched() && !cpu_is_offline(cpu)) {
503 ppc64_runlatch_off();
506 * Go into low thread priority and possibly
512 if (*smt_snooze_delay != 0 &&
513 get_tb() > start_snooze) {
515 dedicated_idle_sleep(cpu);
523 lpaca->lppaca.idle = 0;
526 preempt_enable_no_resched();
530 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
535 static void pseries_shared_idle(void)
537 struct paca_struct *lpaca = get_paca();
538 unsigned int cpu = smp_processor_id();
542 * Indicate to the HV that we are idle. Now would be
543 * a good time to find other work to dispatch.
545 lpaca->lppaca.idle = 1;
547 while (!need_resched() && !cpu_is_offline(cpu)) {
549 ppc64_runlatch_off();
552 * Yield the processor to the hypervisor. We return if
553 * an external interrupt occurs (which are driven prior
554 * to returning here) or if a prod occurs from another
555 * processor. When returning here, external interrupts
558 * Check need_resched() again with interrupts disabled
569 lpaca->lppaca.idle = 0;
572 preempt_enable_no_resched();
576 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
581 static int pSeries_pci_probe_mode(struct pci_bus *bus)
583 if (platform_is_lpar())
584 return PCI_PROBE_DEVTREE;
585 return PCI_PROBE_NORMAL;
589 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
591 /* Don't risk a hypervisor call if we're crashing */
592 if (!crash_shutdown) {
593 unsigned long vpa = __pa(&get_paca()->lppaca);
595 if (unregister_vpa(hard_smp_processor_id(), vpa)) {
596 printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
597 "failed\n", smp_processor_id(),
598 hard_smp_processor_id());
602 if (ppc64_interrupt_controller == IC_OPEN_PIC)
603 mpic_teardown_this_cpu(secondary);
605 xics_teardown_cpu(secondary);
609 struct machdep_calls __initdata pSeries_md = {
610 .probe = pSeries_probe,
611 .setup_arch = pSeries_setup_arch,
612 .init_early = pSeries_init_early,
613 .show_cpuinfo = pSeries_show_cpuinfo,
614 .log_error = pSeries_log_error,
615 .pcibios_fixup = pSeries_final_fixup,
616 .pci_probe_mode = pSeries_pci_probe_mode,
617 .irq_bus_setup = pSeries_irq_bus_setup,
618 .restart = rtas_restart,
619 .power_off = rtas_power_off,
621 .panic = rtas_os_term,
622 .cpu_die = pSeries_mach_cpu_die,
623 .get_boot_time = rtas_get_boot_time,
624 .get_rtc_time = rtas_get_rtc_time,
625 .set_rtc_time = rtas_set_rtc_time,
626 .calibrate_decr = generic_calibrate_decr,
627 .progress = rtas_progress,
628 .check_legacy_ioport = pSeries_check_legacy_ioport,
629 .system_reset_exception = pSeries_system_reset_exception,
630 .machine_check_exception = pSeries_machine_check_exception,
632 .kexec_cpu_down = pseries_kexec_cpu_down,
633 .machine_kexec = default_machine_kexec,
634 .machine_kexec_prepare = default_machine_kexec_prepare,
635 .machine_crash_shutdown = default_machine_crash_shutdown,