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>
65 #include <asm/ppc-pci.h>
66 #include <asm/i8259.h>
70 #include "plpar_wrappers.h"
75 #define DBG(fmt...) udbg_printf(fmt)
80 extern void find_udbg_vterm(void);
82 int fwnmi_active; /* TRUE if an FWNMI handler is present */
84 static void pseries_shared_idle(void);
85 static void pseries_dedicated_idle(void);
87 struct mpic *pSeries_mpic;
89 static void pSeries_show_cpuinfo(struct seq_file *m)
91 struct device_node *root;
92 const char *model = "";
94 root = of_find_node_by_path("/");
96 model = get_property(root, "model", NULL);
97 seq_printf(m, "machine\t\t: CHRP %s\n", model);
101 /* Initialize firmware assisted non-maskable interrupts if
102 * the firmware supports this feature.
104 static void __init fwnmi_init(void)
106 unsigned long system_reset_addr, machine_check_addr;
108 int ibm_nmi_register = rtas_token("ibm,nmi-register");
109 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
112 /* If the kernel's not linked at zero we point the firmware at low
113 * addresses anyway, and use a trampoline to get to the real code. */
114 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
115 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
117 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
122 static void __init pSeries_init_mpic(void)
125 struct device_node *np;
126 unsigned long intack = 0;
128 /* All ISUs are setup, complete initialization */
129 mpic_init(pSeries_mpic);
131 /* Check what kind of cascade ACK we have */
132 if (!(np = of_find_node_by_name(NULL, "pci"))
133 || !(addrp = (unsigned int *)
134 get_property(np, "8259-interrupt-acknowledge", NULL)))
135 printk(KERN_ERR "Cannot find pci to get ack address\n");
137 intack = addrp[prom_n_addr_cells(np)-1];
140 /* Setup the legacy interrupts & controller */
141 i8259_init(intack, 0);
143 /* Hook cascade to mpic */
144 mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
147 static void __init pSeries_setup_mpic(void)
149 unsigned int *opprop;
150 unsigned long openpic_addr = 0;
151 unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
152 struct device_node *root;
155 /* Find the Open PIC if present */
156 root = of_find_node_by_path("/");
157 opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
159 int n = prom_n_addr_cells(root);
161 for (openpic_addr = 0; n > 0; --n)
162 openpic_addr = (openpic_addr << 32) + *opprop++;
163 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
167 BUG_ON(openpic_addr == 0);
169 /* Get the sense values from OF */
170 prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
172 /* Setup the openpic driver */
173 irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
174 pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
175 16, 16, irq_count, /* isu size, irq offset, irq count */
176 NR_IRQS - 4, /* ipi offset */
177 senses, irq_count, /* sense & sense size */
181 static void pseries_lpar_enable_pmcs(void)
183 unsigned long set, reset;
185 power4_enable_pmcs();
189 plpar_hcall_norets(H_PERFMON, set, reset);
191 /* instruct hypervisor to maintain PMCs */
192 if (firmware_has_feature(FW_FEATURE_SPLPAR))
193 get_lppaca()->pmcregs_in_use = 1;
196 static void __init pSeries_setup_arch(void)
198 /* Fixup ppc_md depending on the type of interrupt controller */
199 if (ppc64_interrupt_controller == IC_OPEN_PIC) {
200 ppc_md.init_IRQ = pSeries_init_mpic;
201 ppc_md.get_irq = mpic_get_irq;
202 /* Allocate the mpic now, so that find_and_init_phbs() can
204 pSeries_setup_mpic();
206 ppc_md.init_IRQ = xics_init_IRQ;
207 ppc_md.get_irq = xics_get_irq;
213 /* openpic global configuration register (64-bit format). */
214 /* openpic Interrupt Source Unit pointer (64-bit format). */
215 /* python0 facility area (mmio) (64-bit format) REAL address. */
217 /* init to some ~sane value until calibrate_delay() runs */
218 loops_per_jiffy = 50000000;
221 printk("No ramdisk, default root is /dev/sda2\n");
222 ROOT_DEV = Root_SDA2;
227 /* Find and initialize PCI host bridges */
228 init_pci_config_tokens();
229 find_and_init_phbs();
232 pSeries_nvram_init();
234 /* Choose an idle loop */
235 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
236 vpa_init(boot_cpuid);
237 if (get_lppaca()->shared_proc) {
238 printk(KERN_INFO "Using shared processor idle loop\n");
239 ppc_md.idle_loop = pseries_shared_idle;
241 printk(KERN_INFO "Using dedicated idle loop\n");
242 ppc_md.idle_loop = pseries_dedicated_idle;
245 printk(KERN_INFO "Using default idle loop\n");
246 ppc_md.idle_loop = default_idle;
249 if (firmware_has_feature(FW_FEATURE_LPAR))
250 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
252 ppc_md.enable_pmcs = power4_enable_pmcs;
255 static int __init pSeries_init_panel(void)
257 /* Manually leave the kernel version on the panel. */
258 ppc_md.progress("Linux ppc64\n", 0);
259 ppc_md.progress(system_utsname.version, 0);
263 arch_initcall(pSeries_init_panel);
265 static void __init pSeries_discover_pic(void)
267 struct device_node *np;
271 * Setup interrupt mapping options that are needed for finish_device_tree
272 * to properly parse the OF interrupt tree & do the virtual irq mapping
274 __irq_offset_value = NUM_ISA_INTERRUPTS;
275 ppc64_interrupt_controller = IC_INVALID;
276 for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
277 typep = (char *)get_property(np, "compatible", NULL);
278 if (strstr(typep, "open-pic")) {
279 ppc64_interrupt_controller = IC_OPEN_PIC;
281 } else if (strstr(typep, "ppc-xicp")) {
282 ppc64_interrupt_controller = IC_PPC_XIC;
286 if (ppc64_interrupt_controller == IC_INVALID)
287 printk("pSeries_discover_pic: failed to recognize"
288 " interrupt-controller\n");
292 static void pSeries_mach_cpu_die(void)
296 /* Some hardware requires clearing the CPPR, while other hardware does not
297 * it is safe either way
299 pSeriesLP_cppr_info(0, 0);
301 /* Should never get here... */
306 static int pseries_set_dabr(unsigned long dabr)
308 return plpar_hcall_norets(H_SET_DABR, dabr);
311 static int pseries_set_xdabr(unsigned long dabr)
313 /* We want to catch accesses from kernel and userspace */
314 return plpar_hcall_norets(H_SET_XDABR, dabr,
315 H_DABRX_KERNEL | H_DABRX_USER);
319 * Early initialization. Relocation is on but do not reference unbolted pages
321 static void __init pSeries_init_early(void)
323 DBG(" -> pSeries_init_early()\n");
327 if (firmware_has_feature(FW_FEATURE_LPAR))
332 if (firmware_has_feature(FW_FEATURE_LPAR))
335 if (firmware_has_feature(FW_FEATURE_DABR))
336 ppc_md.set_dabr = pseries_set_dabr;
337 else if (firmware_has_feature(FW_FEATURE_XDABR))
338 ppc_md.set_dabr = pseries_set_xdabr;
340 iommu_init_early_pSeries();
342 pSeries_discover_pic();
344 DBG(" <- pSeries_init_early()\n");
348 static int pSeries_check_legacy_ioport(unsigned int baseport)
350 struct device_node *np;
352 #define I8042_DATA_REG 0x60
353 #define FDC_BASE 0x3f0
358 np = of_find_node_by_type(NULL, "8042");
364 np = of_find_node_by_type(NULL, "fdc");
374 * Called very early, MMU is off, device-tree isn't unflattened
376 extern struct machdep_calls pSeries_md;
378 static int __init pSeries_probe(int platform)
380 if (platform != PLATFORM_PSERIES &&
381 platform != PLATFORM_PSERIES_LPAR)
384 /* if we have some ppc_md fixups for LPAR to do, do
388 if (platform == PLATFORM_PSERIES_LPAR)
389 ppc64_firmware_features |= FW_FEATURE_LPAR;
394 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
396 static inline void dedicated_idle_sleep(unsigned int cpu)
398 struct lppaca *plppaca = &lppaca[cpu ^ 1];
400 /* Only sleep if the other thread is not idle */
401 if (!(plppaca->idle)) {
405 * We are about to sleep the thread and so wont be polling any
408 clear_thread_flag(TIF_POLLING_NRFLAG);
409 smp_mb__after_clear_bit();
412 * SMT dynamic mode. Cede will result in this thread going
413 * dormant, if the partner thread is still doing work. Thread
414 * wakes up if partner goes idle, an interrupt is presented, or
415 * a prod occurs. Returning from the cede enables external
422 set_thread_flag(TIF_POLLING_NRFLAG);
425 * Give the HV an opportunity at the processor, since we are
426 * not doing any work.
432 static void pseries_dedicated_idle(void)
434 unsigned int cpu = smp_processor_id();
435 unsigned long start_snooze;
436 unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
437 set_thread_flag(TIF_POLLING_NRFLAG);
441 * Indicate to the HV that we are idle. Now would be
442 * a good time to find other work to dispatch.
444 get_lppaca()->idle = 1;
446 if (!need_resched()) {
447 start_snooze = get_tb() +
448 *smt_snooze_delay * tb_ticks_per_usec;
450 while (!need_resched() && !cpu_is_offline(cpu)) {
451 ppc64_runlatch_off();
454 * Go into low thread priority and possibly
460 if (*smt_snooze_delay != 0 &&
461 get_tb() > start_snooze) {
463 dedicated_idle_sleep(cpu);
471 get_lppaca()->idle = 0;
474 preempt_enable_no_resched();
478 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
483 static void pseries_shared_idle(void)
485 unsigned int cpu = smp_processor_id();
489 * Indicate to the HV that we are idle. Now would be
490 * a good time to find other work to dispatch.
492 get_lppaca()->idle = 1;
494 while (!need_resched() && !cpu_is_offline(cpu)) {
496 ppc64_runlatch_off();
499 * Yield the processor to the hypervisor. We return if
500 * an external interrupt occurs (which are driven prior
501 * to returning here) or if a prod occurs from another
502 * processor. When returning here, external interrupts
505 * Check need_resched() again with interrupts disabled
516 get_lppaca()->idle = 0;
519 preempt_enable_no_resched();
523 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
528 static int pSeries_pci_probe_mode(struct pci_bus *bus)
530 if (firmware_has_feature(FW_FEATURE_LPAR))
531 return PCI_PROBE_DEVTREE;
532 return PCI_PROBE_NORMAL;
536 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
538 /* Don't risk a hypervisor call if we're crashing */
539 if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
540 unsigned long vpa = __pa(get_lppaca());
542 if (unregister_vpa(hard_smp_processor_id(), vpa)) {
543 printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
544 "failed\n", smp_processor_id(),
545 hard_smp_processor_id());
549 if (ppc64_interrupt_controller == IC_OPEN_PIC)
550 mpic_teardown_this_cpu(secondary);
552 xics_teardown_cpu(secondary);
556 struct machdep_calls __initdata pSeries_md = {
557 .probe = pSeries_probe,
558 .setup_arch = pSeries_setup_arch,
559 .init_early = pSeries_init_early,
560 .show_cpuinfo = pSeries_show_cpuinfo,
561 .log_error = pSeries_log_error,
562 .pcibios_fixup = pSeries_final_fixup,
563 .pci_probe_mode = pSeries_pci_probe_mode,
564 .irq_bus_setup = pSeries_irq_bus_setup,
565 .restart = rtas_restart,
566 .power_off = rtas_power_off,
568 .panic = rtas_os_term,
569 .cpu_die = pSeries_mach_cpu_die,
570 .get_boot_time = rtas_get_boot_time,
571 .get_rtc_time = rtas_get_rtc_time,
572 .set_rtc_time = rtas_set_rtc_time,
573 .calibrate_decr = generic_calibrate_decr,
574 .progress = rtas_progress,
575 .check_legacy_ioport = pSeries_check_legacy_ioport,
576 .system_reset_exception = pSeries_system_reset_exception,
577 .machine_check_exception = pSeries_machine_check_exception,
579 .kexec_cpu_down = pseries_kexec_cpu_down,
580 .machine_kexec = default_machine_kexec,
581 .machine_kexec_prepare = default_machine_kexec_prepare,
582 .machine_crash_shutdown = default_machine_crash_shutdown,