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/cpu.h>
22 #include <linux/errno.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
26 #include <linux/stddef.h>
27 #include <linux/unistd.h>
28 #include <linux/slab.h>
29 #include <linux/user.h>
30 #include <linux/a.out.h>
31 #include <linux/tty.h>
32 #include <linux/major.h>
33 #include <linux/interrupt.h>
34 #include <linux/reboot.h>
35 #include <linux/init.h>
36 #include <linux/ioport.h>
37 #include <linux/console.h>
38 #include <linux/pci.h>
39 #include <linux/utsname.h>
40 #include <linux/adb.h>
41 #include <linux/module.h>
42 #include <linux/delay.h>
43 #include <linux/irq.h>
44 #include <linux/seq_file.h>
45 #include <linux/root_dev.h>
48 #include <asm/processor.h>
50 #include <asm/pgtable.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/iommu.h>
56 #include <asm/machdep.h>
58 #include <asm/kexec.h>
60 #include <asm/nvram.h>
64 #include <asm/ppc-pci.h>
65 #include <asm/i8259.h>
68 #include <asm/firmware.h>
70 #include "plpar_wrappers.h"
74 #define DBG(fmt...) udbg_printf(fmt)
79 /* move those away to a .h */
80 extern void find_udbg_vterm(void);
82 int fwnmi_active; /* TRUE if an FWNMI handler is present */
84 static void pseries_shared_idle_sleep(void);
85 static void pseries_dedicated_idle_sleep(void);
87 static struct device_node *pSeries_mpic_node;
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 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
124 unsigned int cascade_irq = i8259_irq();
125 if (cascade_irq != NO_IRQ)
126 generic_handle_irq(cascade_irq);
127 desc->chip->eoi(irq);
130 static void __init pseries_mpic_init_IRQ(void)
132 struct device_node *np, *old, *cascade = NULL;
133 const unsigned int *addrp;
134 unsigned long intack = 0;
135 const unsigned int *opprop;
136 unsigned long openpic_addr = 0;
137 unsigned int cascade_irq;
138 int naddr, n, i, opplen;
141 np = of_find_node_by_path("/");
142 naddr = prom_n_addr_cells(np);
143 opprop = get_property(np, "platform-open-pic", &opplen);
145 openpic_addr = of_read_number(opprop, naddr);
146 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
150 BUG_ON(openpic_addr == 0);
152 /* Setup the openpic driver */
153 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
155 16, 250, /* isu size, irq count */
157 BUG_ON(mpic == NULL);
160 opplen /= sizeof(u32);
161 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
162 unsigned long isuaddr = of_read_number(opprop + i, naddr);
163 mpic_assign_isu(mpic, n, isuaddr);
166 /* All ISUs are setup, complete initialization */
169 /* Look for cascade */
170 for_each_node_by_type(np, "interrupt-controller")
171 if (device_is_compatible(np, "chrp,iic")) {
178 cascade_irq = irq_of_parse_and_map(cascade, 0);
179 if (cascade == NO_IRQ) {
180 printk(KERN_ERR "mpic: failed to map cascade interrupt");
185 for (old = of_node_get(cascade); old != NULL ; old = np) {
186 np = of_get_parent(old);
190 if (strcmp(np->name, "pci") != 0)
192 addrp = get_property(np, "8259-interrupt-acknowledge",
196 naddr = prom_n_addr_cells(np);
197 intack = addrp[naddr-1];
199 intack |= ((unsigned long)addrp[naddr-2]) << 32;
202 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
204 i8259_init(cascade, intack);
205 of_node_put(cascade);
206 set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
209 static void pseries_lpar_enable_pmcs(void)
211 unsigned long set, reset;
215 plpar_hcall_norets(H_PERFMON, set, reset);
217 /* instruct hypervisor to maintain PMCs */
218 if (firmware_has_feature(FW_FEATURE_SPLPAR))
219 get_lppaca()->pmcregs_in_use = 1;
223 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
225 /* Don't risk a hypervisor call if we're crashing */
226 if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
229 addr = __pa(get_slb_shadow());
230 if (unregister_slb_shadow(hard_smp_processor_id(), addr))
231 printk("SLB shadow buffer deregistration of "
232 "cpu %u (hw_cpu_id %d) failed\n",
234 hard_smp_processor_id());
236 addr = __pa(get_lppaca());
237 if (unregister_vpa(hard_smp_processor_id(), addr)) {
238 printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
239 "failed\n", smp_processor_id(),
240 hard_smp_processor_id());
245 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
247 pseries_kexec_cpu_down(crash_shutdown, secondary);
248 mpic_teardown_this_cpu(secondary);
251 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
253 pseries_kexec_cpu_down(crash_shutdown, secondary);
254 xics_teardown_cpu(secondary);
256 #endif /* CONFIG_KEXEC */
258 static void __init pseries_discover_pic(void)
260 struct device_node *np;
263 for (np = NULL; (np = of_find_node_by_name(np,
264 "interrupt-controller"));) {
265 typep = get_property(np, "compatible", NULL);
266 if (strstr(typep, "open-pic")) {
267 pSeries_mpic_node = of_node_get(np);
268 ppc_md.init_IRQ = pseries_mpic_init_IRQ;
269 ppc_md.get_irq = mpic_get_irq;
271 ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
273 smp_init_pseries_mpic();
275 } else if (strstr(typep, "ppc-xicp")) {
276 ppc_md.init_IRQ = xics_init_IRQ;
278 ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
280 smp_init_pseries_xics();
284 printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
285 " interrupt-controller\n");
288 static void __init pSeries_setup_arch(void)
290 /* Discover PIC type and setup ppc_md accordingly */
291 pseries_discover_pic();
293 /* openpic global configuration register (64-bit format). */
294 /* openpic Interrupt Source Unit pointer (64-bit format). */
295 /* python0 facility area (mmio) (64-bit format) REAL address. */
297 /* init to some ~sane value until calibrate_delay() runs */
298 loops_per_jiffy = 50000000;
301 printk("No ramdisk, default root is /dev/sda2\n");
302 ROOT_DEV = Root_SDA2;
307 /* Find and initialize PCI host bridges */
308 init_pci_config_tokens();
309 find_and_init_phbs();
312 pSeries_nvram_init();
314 /* Choose an idle loop */
315 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
316 vpa_init(boot_cpuid);
317 if (get_lppaca()->shared_proc) {
318 printk(KERN_DEBUG "Using shared processor idle loop\n");
319 ppc_md.power_save = pseries_shared_idle_sleep;
321 printk(KERN_DEBUG "Using dedicated idle loop\n");
322 ppc_md.power_save = pseries_dedicated_idle_sleep;
325 printk(KERN_DEBUG "Using default idle loop\n");
328 if (firmware_has_feature(FW_FEATURE_LPAR))
329 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
331 ppc_md.enable_pmcs = power4_enable_pmcs;
334 static int __init pSeries_init_panel(void)
336 /* Manually leave the kernel version on the panel. */
337 ppc_md.progress("Linux ppc64\n", 0);
338 ppc_md.progress(init_utsname()->version, 0);
342 arch_initcall(pSeries_init_panel);
344 static int pseries_set_dabr(unsigned long dabr)
346 return plpar_hcall_norets(H_SET_DABR, dabr);
349 static int pseries_set_xdabr(unsigned long dabr)
351 /* We want to catch accesses from kernel and userspace */
352 return plpar_hcall_norets(H_SET_XDABR, dabr,
353 H_DABRX_KERNEL | H_DABRX_USER);
357 * Early initialization. Relocation is on but do not reference unbolted pages
359 static void __init pSeries_init_early(void)
361 DBG(" -> pSeries_init_early()\n");
365 if (firmware_has_feature(FW_FEATURE_LPAR))
368 if (firmware_has_feature(FW_FEATURE_DABR))
369 ppc_md.set_dabr = pseries_set_dabr;
370 else if (firmware_has_feature(FW_FEATURE_XDABR))
371 ppc_md.set_dabr = pseries_set_xdabr;
373 iommu_init_early_pSeries();
375 DBG(" <- pSeries_init_early()\n");
379 static int pSeries_check_legacy_ioport(unsigned int baseport)
381 struct device_node *np;
383 #define I8042_DATA_REG 0x60
384 #define FDC_BASE 0x3f0
389 np = of_find_node_by_type(NULL, "8042");
395 np = of_find_node_by_type(NULL, "fdc");
405 * Called very early, MMU is off, device-tree isn't unflattened
408 static int __init pSeries_probe_hypertas(unsigned long node,
409 const char *uname, int depth,
413 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
416 if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
417 powerpc_firmware_features |= FW_FEATURE_LPAR;
422 static int __init pSeries_probe(void)
424 unsigned long root = of_get_flat_dt_root();
425 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
429 if (strcmp(dtype, "chrp"))
432 /* Cell blades firmware claims to be chrp while it's not. Until this
433 * is fixed, we need to avoid those here.
435 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
436 of_flat_dt_is_compatible(root, "IBM,CBEA"))
439 DBG("pSeries detected, looking for LPAR capability...\n");
441 /* Now try to figure out if we are running on LPAR */
442 of_scan_flat_dt(pSeries_probe_hypertas, NULL);
444 if (firmware_has_feature(FW_FEATURE_LPAR))
449 DBG("Machine is%s LPAR !\n",
450 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
456 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
458 static void pseries_dedicated_idle_sleep(void)
460 unsigned int cpu = smp_processor_id();
461 unsigned long start_snooze;
464 * Indicate to the HV that we are idle. Now would be
465 * a good time to find other work to dispatch.
467 get_lppaca()->idle = 1;
470 * We come in with interrupts disabled, and need_resched()
471 * has been checked recently. If we should poll for a little
474 if (__get_cpu_var(smt_snooze_delay)) {
475 start_snooze = get_tb() +
476 __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
478 set_thread_flag(TIF_POLLING_NRFLAG);
480 while (get_tb() < start_snooze) {
481 if (need_resched() || cpu_is_offline(cpu))
483 ppc64_runlatch_off();
489 clear_thread_flag(TIF_POLLING_NRFLAG);
492 if (need_resched() || cpu_is_offline(cpu))
500 get_lppaca()->idle = 0;
503 static void pseries_shared_idle_sleep(void)
506 * Indicate to the HV that we are idle. Now would be
507 * a good time to find other work to dispatch.
509 get_lppaca()->idle = 1;
512 * Yield the processor to the hypervisor. We return if
513 * an external interrupt occurs (which are driven prior
514 * to returning here) or if a prod occurs from another
515 * processor. When returning here, external interrupts
520 get_lppaca()->idle = 0;
523 static int pSeries_pci_probe_mode(struct pci_bus *bus)
525 if (firmware_has_feature(FW_FEATURE_LPAR))
526 return PCI_PROBE_DEVTREE;
527 return PCI_PROBE_NORMAL;
530 define_machine(pseries) {
532 .probe = pSeries_probe,
533 .setup_arch = pSeries_setup_arch,
534 .init_early = pSeries_init_early,
535 .show_cpuinfo = pSeries_show_cpuinfo,
536 .log_error = pSeries_log_error,
537 .pcibios_fixup = pSeries_final_fixup,
538 .pci_probe_mode = pSeries_pci_probe_mode,
539 .restart = rtas_restart,
540 .power_off = rtas_power_off,
542 .panic = rtas_os_term,
543 .get_boot_time = rtas_get_boot_time,
544 .get_rtc_time = rtas_get_rtc_time,
545 .set_rtc_time = rtas_set_rtc_time,
546 .calibrate_decr = generic_calibrate_decr,
547 .progress = rtas_progress,
548 .check_legacy_ioport = pSeries_check_legacy_ioport,
549 .system_reset_exception = pSeries_system_reset_exception,
550 .machine_check_exception = pSeries_machine_check_exception,
552 .machine_kexec = default_machine_kexec,
553 .machine_kexec_prepare = default_machine_kexec_prepare,
554 .machine_crash_shutdown = default_machine_crash_shutdown,