xref: /linux/arch/powerpc/platforms/pseries/setup.c (revision b454cc6636d254fbf6049b73e9560aee76fb04a3) 
1 /*
2  *  64-bit pSeries and RS/6000 setup code.
3  *
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
8  *
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.
13  */
14 
15 /*
16  * bootup setup stuff..
17  */
18 
19 #undef DEBUG
20 
21 #include <linux/cpu.h>
22 #include <linux/errno.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
25 #include <linux/mm.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>
46 
47 #include <asm/mmu.h>
48 #include <asm/processor.h>
49 #include <asm/io.h>
50 #include <asm/pgtable.h>
51 #include <asm/prom.h>
52 #include <asm/rtas.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/iommu.h>
55 #include <asm/dma.h>
56 #include <asm/machdep.h>
57 #include <asm/irq.h>
58 #include <asm/kexec.h>
59 #include <asm/time.h>
60 #include <asm/nvram.h>
61 #include "xics.h"
62 #include <asm/pmc.h>
63 #include <asm/mpic.h>
64 #include <asm/ppc-pci.h>
65 #include <asm/i8259.h>
66 #include <asm/udbg.h>
67 #include <asm/smp.h>
68 
69 #include "plpar_wrappers.h"
70 #include "ras.h"
71 #include "firmware.h"
72 
73 #ifdef DEBUG
74 #define DBG(fmt...) udbg_printf(fmt)
75 #else
76 #define DBG(fmt...)
77 #endif
78 
79 /* move those away to a .h */
80 extern void smp_init_pseries_mpic(void);
81 extern void smp_init_pseries_xics(void);
82 extern void find_udbg_vterm(void);
83 
84 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
85 
86 static void pseries_shared_idle_sleep(void);
87 static void pseries_dedicated_idle_sleep(void);
88 
89 static struct device_node *pSeries_mpic_node;
90 
91 static void pSeries_show_cpuinfo(struct seq_file *m)
92 {
93 	struct device_node *root;
94 	const char *model = "";
95 
96 	root = of_find_node_by_path("/");
97 	if (root)
98 		model = get_property(root, "model", NULL);
99 	seq_printf(m, "machine\t\t: CHRP %s\n", model);
100 	of_node_put(root);
101 }
102 
103 /* Initialize firmware assisted non-maskable interrupts if
104  * the firmware supports this feature.
105  */
106 static void __init fwnmi_init(void)
107 {
108 	unsigned long system_reset_addr, machine_check_addr;
109 
110 	int ibm_nmi_register = rtas_token("ibm,nmi-register");
111 	if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
112 		return;
113 
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;
118 
119 	if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
120 				machine_check_addr))
121 		fwnmi_active = 1;
122 }
123 
124 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
125 {
126 	unsigned int cascade_irq = i8259_irq();
127 	if (cascade_irq != NO_IRQ)
128 		generic_handle_irq(cascade_irq);
129 	desc->chip->eoi(irq);
130 }
131 
132 static void __init pseries_mpic_init_IRQ(void)
133 {
134 	struct device_node *np, *old, *cascade = NULL;
135         const unsigned int *addrp;
136 	unsigned long intack = 0;
137 	const unsigned int *opprop;
138 	unsigned long openpic_addr = 0;
139 	unsigned int cascade_irq;
140 	int naddr, n, i, opplen;
141 	struct mpic *mpic;
142 
143 	np = of_find_node_by_path("/");
144 	naddr = prom_n_addr_cells(np);
145 	opprop = get_property(np, "platform-open-pic", &opplen);
146 	if (opprop != 0) {
147 		openpic_addr = of_read_number(opprop, naddr);
148 		printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
149 	}
150 	of_node_put(np);
151 
152 	BUG_ON(openpic_addr == 0);
153 
154 	/* Setup the openpic driver */
155 	mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
156 			  MPIC_PRIMARY,
157 			  16, 250, /* isu size, irq count */
158 			  " MPIC     ");
159 	BUG_ON(mpic == NULL);
160 
161 	/* Add ISUs */
162 	opplen /= sizeof(u32);
163 	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
164 		unsigned long isuaddr = of_read_number(opprop + i, naddr);
165 		mpic_assign_isu(mpic, n, isuaddr);
166 	}
167 
168 	/* All ISUs are setup, complete initialization */
169 	mpic_init(mpic);
170 
171 	/* Look for cascade */
172 	for_each_node_by_type(np, "interrupt-controller")
173 		if (device_is_compatible(np, "chrp,iic")) {
174 			cascade = np;
175 			break;
176 		}
177 	if (cascade == NULL)
178 		return;
179 
180 	cascade_irq = irq_of_parse_and_map(cascade, 0);
181 	if (cascade == NO_IRQ) {
182 		printk(KERN_ERR "mpic: failed to map cascade interrupt");
183 		return;
184 	}
185 
186 	/* Check ACK type */
187 	for (old = of_node_get(cascade); old != NULL ; old = np) {
188 		np = of_get_parent(old);
189 		of_node_put(old);
190 		if (np == NULL)
191 			break;
192 		if (strcmp(np->name, "pci") != 0)
193 			continue;
194 		addrp = get_property(np, "8259-interrupt-acknowledge",
195 					    NULL);
196 		if (addrp == NULL)
197 			continue;
198 		naddr = prom_n_addr_cells(np);
199 		intack = addrp[naddr-1];
200 		if (naddr > 1)
201 			intack |= ((unsigned long)addrp[naddr-2]) << 32;
202 	}
203 	if (intack)
204 		printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
205 		       intack);
206 	i8259_init(cascade, intack);
207 	of_node_put(cascade);
208 	set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
209 }
210 
211 static void pseries_lpar_enable_pmcs(void)
212 {
213 	unsigned long set, reset;
214 
215 	set = 1UL << 63;
216 	reset = 0;
217 	plpar_hcall_norets(H_PERFMON, set, reset);
218 
219 	/* instruct hypervisor to maintain PMCs */
220 	if (firmware_has_feature(FW_FEATURE_SPLPAR))
221 		get_lppaca()->pmcregs_in_use = 1;
222 }
223 
224 #ifdef CONFIG_KEXEC
225 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
226 {
227 	/* Don't risk a hypervisor call if we're crashing */
228 	if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
229 		unsigned long addr;
230 
231 		addr = __pa(get_slb_shadow());
232 		if (unregister_slb_shadow(hard_smp_processor_id(), addr))
233 			printk("SLB shadow buffer deregistration of "
234 			       "cpu %u (hw_cpu_id %d) failed\n",
235 			       smp_processor_id(),
236 			       hard_smp_processor_id());
237 
238 		addr = __pa(get_lppaca());
239 		if (unregister_vpa(hard_smp_processor_id(), addr)) {
240 			printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
241 					"failed\n", smp_processor_id(),
242 					hard_smp_processor_id());
243 		}
244 	}
245 }
246 
247 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
248 {
249 	pseries_kexec_cpu_down(crash_shutdown, secondary);
250 	mpic_teardown_this_cpu(secondary);
251 }
252 
253 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
254 {
255 	pseries_kexec_cpu_down(crash_shutdown, secondary);
256 	xics_teardown_cpu(secondary);
257 }
258 #endif /* CONFIG_KEXEC */
259 
260 static void __init pseries_discover_pic(void)
261 {
262 	struct device_node *np;
263 	const char *typep;
264 
265 	for (np = NULL; (np = of_find_node_by_name(np,
266 						   "interrupt-controller"));) {
267 		typep = get_property(np, "compatible", NULL);
268 		if (strstr(typep, "open-pic")) {
269 			pSeries_mpic_node = of_node_get(np);
270 			ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
271 			ppc_md.get_irq        = mpic_get_irq;
272 #ifdef CONFIG_KEXEC
273 			ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
274 #endif
275 #ifdef CONFIG_SMP
276 			smp_init_pseries_mpic();
277 #endif
278 			return;
279 		} else if (strstr(typep, "ppc-xicp")) {
280 			ppc_md.init_IRQ       = xics_init_IRQ;
281 #ifdef CONFIG_KEXEC
282 			ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
283 #endif
284 #ifdef CONFIG_SMP
285 			smp_init_pseries_xics();
286 #endif
287 			return;
288 		}
289 	}
290 	printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
291 	       " interrupt-controller\n");
292 }
293 
294 static void __init pSeries_setup_arch(void)
295 {
296 	/* Discover PIC type and setup ppc_md accordingly */
297 	pseries_discover_pic();
298 
299 	/* openpic global configuration register (64-bit format). */
300 	/* openpic Interrupt Source Unit pointer (64-bit format). */
301 	/* python0 facility area (mmio) (64-bit format) REAL address. */
302 
303 	/* init to some ~sane value until calibrate_delay() runs */
304 	loops_per_jiffy = 50000000;
305 
306 	if (ROOT_DEV == 0) {
307 		printk("No ramdisk, default root is /dev/sda2\n");
308 		ROOT_DEV = Root_SDA2;
309 	}
310 
311 	fwnmi_init();
312 
313 	/* Find and initialize PCI host bridges */
314 	init_pci_config_tokens();
315 	find_and_init_phbs();
316 	eeh_init();
317 
318 	pSeries_nvram_init();
319 
320 	/* Choose an idle loop */
321 	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
322 		vpa_init(boot_cpuid);
323 		if (get_lppaca()->shared_proc) {
324 			printk(KERN_DEBUG "Using shared processor idle loop\n");
325 			ppc_md.power_save = pseries_shared_idle_sleep;
326 		} else {
327 			printk(KERN_DEBUG "Using dedicated idle loop\n");
328 			ppc_md.power_save = pseries_dedicated_idle_sleep;
329 		}
330 	} else {
331 		printk(KERN_DEBUG "Using default idle loop\n");
332 	}
333 
334 	if (firmware_has_feature(FW_FEATURE_LPAR))
335 		ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
336 	else
337 		ppc_md.enable_pmcs = power4_enable_pmcs;
338 }
339 
340 static int __init pSeries_init_panel(void)
341 {
342 	/* Manually leave the kernel version on the panel. */
343 	ppc_md.progress("Linux ppc64\n", 0);
344 	ppc_md.progress(init_utsname()->version, 0);
345 
346 	return 0;
347 }
348 arch_initcall(pSeries_init_panel);
349 
350 static int pseries_set_dabr(unsigned long dabr)
351 {
352 	return plpar_hcall_norets(H_SET_DABR, dabr);
353 }
354 
355 static int pseries_set_xdabr(unsigned long dabr)
356 {
357 	/* We want to catch accesses from kernel and userspace */
358 	return plpar_hcall_norets(H_SET_XDABR, dabr,
359 			H_DABRX_KERNEL | H_DABRX_USER);
360 }
361 
362 /*
363  * Early initialization.  Relocation is on but do not reference unbolted pages
364  */
365 static void __init pSeries_init_early(void)
366 {
367 	DBG(" -> pSeries_init_early()\n");
368 
369 	fw_feature_init();
370 
371 	if (firmware_has_feature(FW_FEATURE_LPAR))
372 		find_udbg_vterm();
373 
374 	if (firmware_has_feature(FW_FEATURE_DABR))
375 		ppc_md.set_dabr = pseries_set_dabr;
376 	else if (firmware_has_feature(FW_FEATURE_XDABR))
377 		ppc_md.set_dabr = pseries_set_xdabr;
378 
379 	iommu_init_early_pSeries();
380 
381 	DBG(" <- pSeries_init_early()\n");
382 }
383 
384 
385 static int pSeries_check_legacy_ioport(unsigned int baseport)
386 {
387 	struct device_node *np;
388 
389 #define I8042_DATA_REG	0x60
390 #define FDC_BASE	0x3f0
391 
392 
393 	switch(baseport) {
394 	case I8042_DATA_REG:
395 		np = of_find_node_by_type(NULL, "8042");
396 		if (np == NULL)
397 			return -ENODEV;
398 		of_node_put(np);
399 		break;
400 	case FDC_BASE:
401 		np = of_find_node_by_type(NULL, "fdc");
402 		if (np == NULL)
403 			return -ENODEV;
404 		of_node_put(np);
405 		break;
406 	}
407 	return 0;
408 }
409 
410 /*
411  * Called very early, MMU is off, device-tree isn't unflattened
412  */
413 
414 static int __init pSeries_probe_hypertas(unsigned long node,
415 					 const char *uname, int depth,
416 					 void *data)
417 {
418 	if (depth != 1 ||
419 	    (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
420  		return 0;
421 
422 	if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
423  		powerpc_firmware_features |= FW_FEATURE_LPAR;
424 
425  	return 1;
426 }
427 
428 static int __init pSeries_probe(void)
429 {
430 	unsigned long root = of_get_flat_dt_root();
431  	char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
432 
433  	if (dtype == NULL)
434  		return 0;
435  	if (strcmp(dtype, "chrp"))
436 		return 0;
437 
438 	/* Cell blades firmware claims to be chrp while it's not. Until this
439 	 * is fixed, we need to avoid those here.
440 	 */
441 	if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
442 	    of_flat_dt_is_compatible(root, "IBM,CBEA"))
443 		return 0;
444 
445 	DBG("pSeries detected, looking for LPAR capability...\n");
446 
447 	/* Now try to figure out if we are running on LPAR */
448 	of_scan_flat_dt(pSeries_probe_hypertas, NULL);
449 
450 	if (firmware_has_feature(FW_FEATURE_LPAR))
451 		hpte_init_lpar();
452 	else
453 		hpte_init_native();
454 
455 	DBG("Machine is%s LPAR !\n",
456 	    (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
457 
458 	return 1;
459 }
460 
461 
462 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
463 
464 static void pseries_dedicated_idle_sleep(void)
465 {
466 	unsigned int cpu = smp_processor_id();
467 	unsigned long start_snooze;
468 
469 	/*
470 	 * Indicate to the HV that we are idle. Now would be
471 	 * a good time to find other work to dispatch.
472 	 */
473 	get_lppaca()->idle = 1;
474 
475 	/*
476 	 * We come in with interrupts disabled, and need_resched()
477 	 * has been checked recently.  If we should poll for a little
478 	 * while, do so.
479 	 */
480 	if (__get_cpu_var(smt_snooze_delay)) {
481 		start_snooze = get_tb() +
482 			__get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
483 		local_irq_enable();
484 		set_thread_flag(TIF_POLLING_NRFLAG);
485 
486 		while (get_tb() < start_snooze) {
487 			if (need_resched() || cpu_is_offline(cpu))
488 				goto out;
489 			ppc64_runlatch_off();
490 			HMT_low();
491 			HMT_very_low();
492 		}
493 
494 		HMT_medium();
495 		clear_thread_flag(TIF_POLLING_NRFLAG);
496 		smp_mb();
497 		local_irq_disable();
498 		if (need_resched() || cpu_is_offline(cpu))
499 			goto out;
500 	}
501 
502 	cede_processor();
503 
504 out:
505 	HMT_medium();
506 	get_lppaca()->idle = 0;
507 }
508 
509 static void pseries_shared_idle_sleep(void)
510 {
511 	/*
512 	 * Indicate to the HV that we are idle. Now would be
513 	 * a good time to find other work to dispatch.
514 	 */
515 	get_lppaca()->idle = 1;
516 
517 	/*
518 	 * Yield the processor to the hypervisor.  We return if
519 	 * an external interrupt occurs (which are driven prior
520 	 * to returning here) or if a prod occurs from another
521 	 * processor. When returning here, external interrupts
522 	 * are enabled.
523 	 */
524 	cede_processor();
525 
526 	get_lppaca()->idle = 0;
527 }
528 
529 static int pSeries_pci_probe_mode(struct pci_bus *bus)
530 {
531 	if (firmware_has_feature(FW_FEATURE_LPAR))
532 		return PCI_PROBE_DEVTREE;
533 	return PCI_PROBE_NORMAL;
534 }
535 
536 define_machine(pseries) {
537 	.name			= "pSeries",
538 	.probe			= pSeries_probe,
539 	.setup_arch		= pSeries_setup_arch,
540 	.init_early		= pSeries_init_early,
541 	.show_cpuinfo		= pSeries_show_cpuinfo,
542 	.log_error		= pSeries_log_error,
543 	.pcibios_fixup		= pSeries_final_fixup,
544 	.pci_probe_mode		= pSeries_pci_probe_mode,
545 	.restart		= rtas_restart,
546 	.power_off		= rtas_power_off,
547 	.halt			= rtas_halt,
548 	.panic			= rtas_os_term,
549 	.get_boot_time		= rtas_get_boot_time,
550 	.get_rtc_time		= rtas_get_rtc_time,
551 	.set_rtc_time		= rtas_set_rtc_time,
552 	.calibrate_decr		= generic_calibrate_decr,
553 	.progress		= rtas_progress,
554 	.check_legacy_ioport	= pSeries_check_legacy_ioport,
555 	.system_reset_exception = pSeries_system_reset_exception,
556 	.machine_check_exception = pSeries_machine_check_exception,
557 #ifdef CONFIG_KEXEC
558 	.machine_kexec		= default_machine_kexec,
559 	.machine_kexec_prepare	= default_machine_kexec_prepare,
560 	.machine_crash_shutdown	= default_machine_crash_shutdown,
561 #endif
562 };
563