[POWERPC] Fix sparse warnings in arch/powerpc/platforms/pseries
[linux-3.10.git] / arch / powerpc / platforms / pseries / setup.c
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 #include <linux/cpu.h>
20 #include <linux/errno.h>
21 #include <linux/sched.h>
22 #include <linux/kernel.h>
23 #include <linux/mm.h>
24 #include <linux/stddef.h>
25 #include <linux/unistd.h>
26 #include <linux/slab.h>
27 #include <linux/user.h>
28 #include <linux/a.out.h>
29 #include <linux/tty.h>
30 #include <linux/major.h>
31 #include <linux/interrupt.h>
32 #include <linux/reboot.h>
33 #include <linux/init.h>
34 #include <linux/ioport.h>
35 #include <linux/console.h>
36 #include <linux/pci.h>
37 #include <linux/utsname.h>
38 #include <linux/adb.h>
39 #include <linux/module.h>
40 #include <linux/delay.h>
41 #include <linux/irq.h>
42 #include <linux/seq_file.h>
43 #include <linux/root_dev.h>
44
45 #include <asm/mmu.h>
46 #include <asm/processor.h>
47 #include <asm/io.h>
48 #include <asm/pgtable.h>
49 #include <asm/prom.h>
50 #include <asm/rtas.h>
51 #include <asm/pci-bridge.h>
52 #include <asm/iommu.h>
53 #include <asm/dma.h>
54 #include <asm/machdep.h>
55 #include <asm/irq.h>
56 #include <asm/time.h>
57 #include <asm/nvram.h>
58 #include "xics.h"
59 #include <asm/pmc.h>
60 #include <asm/mpic.h>
61 #include <asm/ppc-pci.h>
62 #include <asm/i8259.h>
63 #include <asm/udbg.h>
64 #include <asm/smp.h>
65 #include <asm/firmware.h>
66 #include <asm/eeh.h>
67
68 #include "plpar_wrappers.h"
69 #include "pseries.h"
70
71
72 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
73
74 static void pseries_shared_idle_sleep(void);
75 static void pseries_dedicated_idle_sleep(void);
76
77 static struct device_node *pSeries_mpic_node;
78
79 static void pSeries_show_cpuinfo(struct seq_file *m)
80 {
81         struct device_node *root;
82         const char *model = "";
83
84         root = of_find_node_by_path("/");
85         if (root)
86                 model = of_get_property(root, "model", NULL);
87         seq_printf(m, "machine\t\t: CHRP %s\n", model);
88         of_node_put(root);
89 }
90
91 /* Initialize firmware assisted non-maskable interrupts if
92  * the firmware supports this feature.
93  */
94 static void __init fwnmi_init(void)
95 {
96         unsigned long system_reset_addr, machine_check_addr;
97
98         int ibm_nmi_register = rtas_token("ibm,nmi-register");
99         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
100                 return;
101
102         /* If the kernel's not linked at zero we point the firmware at low
103          * addresses anyway, and use a trampoline to get to the real code. */
104         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
105         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
106
107         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
108                                 machine_check_addr))
109                 fwnmi_active = 1;
110 }
111
112 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
113 {
114         unsigned int cascade_irq = i8259_irq();
115         if (cascade_irq != NO_IRQ)
116                 generic_handle_irq(cascade_irq);
117         desc->chip->eoi(irq);
118 }
119
120 static void __init pseries_setup_i8259_cascade(void)
121 {
122         struct device_node *np, *old, *found = NULL;
123         unsigned int cascade;
124         const u32 *addrp;
125         unsigned long intack = 0;
126         int naddr;
127
128         for_each_node_by_type(np, "interrupt-controller") {
129                 if (of_device_is_compatible(np, "chrp,iic")) {
130                         found = np;
131                         break;
132                 }
133         }
134
135         if (found == NULL) {
136                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
137                 return;
138         }
139
140         cascade = irq_of_parse_and_map(found, 0);
141         if (cascade == NO_IRQ) {
142                 printk(KERN_ERR "pic: failed to map cascade interrupt");
143                 return;
144         }
145         pr_debug("pic: cascade mapped to irq %d\n", cascade);
146
147         for (old = of_node_get(found); old != NULL ; old = np) {
148                 np = of_get_parent(old);
149                 of_node_put(old);
150                 if (np == NULL)
151                         break;
152                 if (strcmp(np->name, "pci") != 0)
153                         continue;
154                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
155                 if (addrp == NULL)
156                         continue;
157                 naddr = of_n_addr_cells(np);
158                 intack = addrp[naddr-1];
159                 if (naddr > 1)
160                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
161         }
162         if (intack)
163                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
164         i8259_init(found, intack);
165         of_node_put(found);
166         set_irq_chained_handler(cascade, pseries_8259_cascade);
167 }
168
169 static void __init pseries_mpic_init_IRQ(void)
170 {
171         struct device_node *np;
172         const unsigned int *opprop;
173         unsigned long openpic_addr = 0;
174         int naddr, n, i, opplen;
175         struct mpic *mpic;
176
177         np = of_find_node_by_path("/");
178         naddr = of_n_addr_cells(np);
179         opprop = of_get_property(np, "platform-open-pic", &opplen);
180         if (opprop != 0) {
181                 openpic_addr = of_read_number(opprop, naddr);
182                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
183         }
184         of_node_put(np);
185
186         BUG_ON(openpic_addr == 0);
187
188         /* Setup the openpic driver */
189         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
190                           MPIC_PRIMARY,
191                           16, 250, /* isu size, irq count */
192                           " MPIC     ");
193         BUG_ON(mpic == NULL);
194
195         /* Add ISUs */
196         opplen /= sizeof(u32);
197         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
198                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
199                 mpic_assign_isu(mpic, n, isuaddr);
200         }
201
202         /* All ISUs are setup, complete initialization */
203         mpic_init(mpic);
204
205         /* Look for cascade */
206         pseries_setup_i8259_cascade();
207 }
208
209 static void __init pseries_xics_init_IRQ(void)
210 {
211         xics_init_IRQ();
212         pseries_setup_i8259_cascade();
213 }
214
215 static void pseries_lpar_enable_pmcs(void)
216 {
217         unsigned long set, reset;
218
219         set = 1UL << 63;
220         reset = 0;
221         plpar_hcall_norets(H_PERFMON, set, reset);
222
223         /* instruct hypervisor to maintain PMCs */
224         if (firmware_has_feature(FW_FEATURE_SPLPAR))
225                 get_lppaca()->pmcregs_in_use = 1;
226 }
227
228 static void __init pseries_discover_pic(void)
229 {
230         struct device_node *np;
231         const char *typep;
232
233         for (np = NULL; (np = of_find_node_by_name(np,
234                                                    "interrupt-controller"));) {
235                 typep = of_get_property(np, "compatible", NULL);
236                 if (strstr(typep, "open-pic")) {
237                         pSeries_mpic_node = of_node_get(np);
238                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
239                         ppc_md.get_irq        = mpic_get_irq;
240                         setup_kexec_cpu_down_mpic();
241                         smp_init_pseries_mpic();
242                         return;
243                 } else if (strstr(typep, "ppc-xicp")) {
244                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
245                         setup_kexec_cpu_down_xics();
246                         smp_init_pseries_xics();
247                         return;
248                 }
249         }
250         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
251                " interrupt-controller\n");
252 }
253
254 static void __init pSeries_setup_arch(void)
255 {
256         /* Discover PIC type and setup ppc_md accordingly */
257         pseries_discover_pic();
258
259         /* openpic global configuration register (64-bit format). */
260         /* openpic Interrupt Source Unit pointer (64-bit format). */
261         /* python0 facility area (mmio) (64-bit format) REAL address. */
262
263         /* init to some ~sane value until calibrate_delay() runs */
264         loops_per_jiffy = 50000000;
265
266         fwnmi_init();
267
268         /* Find and initialize PCI host bridges */
269         init_pci_config_tokens();
270         find_and_init_phbs();
271         eeh_init();
272
273         pSeries_nvram_init();
274
275         /* Choose an idle loop */
276         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
277                 vpa_init(boot_cpuid);
278                 if (get_lppaca()->shared_proc) {
279                         printk(KERN_DEBUG "Using shared processor idle loop\n");
280                         ppc_md.power_save = pseries_shared_idle_sleep;
281                 } else {
282                         printk(KERN_DEBUG "Using dedicated idle loop\n");
283                         ppc_md.power_save = pseries_dedicated_idle_sleep;
284                 }
285         } else {
286                 printk(KERN_DEBUG "Using default idle loop\n");
287         }
288
289         if (firmware_has_feature(FW_FEATURE_LPAR))
290                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
291         else
292                 ppc_md.enable_pmcs = power4_enable_pmcs;
293 }
294
295 static int __init pSeries_init_panel(void)
296 {
297         /* Manually leave the kernel version on the panel. */
298         ppc_md.progress("Linux ppc64\n", 0);
299         ppc_md.progress(init_utsname()->version, 0);
300
301         return 0;
302 }
303 arch_initcall(pSeries_init_panel);
304
305 static int pseries_set_dabr(unsigned long dabr)
306 {
307         return plpar_hcall_norets(H_SET_DABR, dabr);
308 }
309
310 static int pseries_set_xdabr(unsigned long dabr)
311 {
312         /* We want to catch accesses from kernel and userspace */
313         return plpar_hcall_norets(H_SET_XDABR, dabr,
314                         H_DABRX_KERNEL | H_DABRX_USER);
315 }
316
317 /*
318  * Early initialization.  Relocation is on but do not reference unbolted pages
319  */
320 static void __init pSeries_init_early(void)
321 {
322         pr_debug(" -> pSeries_init_early()\n");
323
324         if (firmware_has_feature(FW_FEATURE_LPAR))
325                 find_udbg_vterm();
326
327         if (firmware_has_feature(FW_FEATURE_DABR))
328                 ppc_md.set_dabr = pseries_set_dabr;
329         else if (firmware_has_feature(FW_FEATURE_XDABR))
330                 ppc_md.set_dabr = pseries_set_xdabr;
331
332         iommu_init_early_pSeries();
333
334         pr_debug(" <- pSeries_init_early()\n");
335 }
336
337 /*
338  * Called very early, MMU is off, device-tree isn't unflattened
339  */
340
341 static int __init pSeries_probe_hypertas(unsigned long node,
342                                          const char *uname, int depth,
343                                          void *data)
344 {
345         const char *hypertas;
346         unsigned long len;
347
348         if (depth != 1 ||
349             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
350                 return 0;
351
352         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
353         if (!hypertas)
354                 return 1;
355
356         powerpc_firmware_features |= FW_FEATURE_LPAR;
357         fw_feature_init(hypertas, len);
358
359         return 1;
360 }
361
362 static int __init pSeries_probe(void)
363 {
364         unsigned long root = of_get_flat_dt_root();
365         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
366
367         if (dtype == NULL)
368                 return 0;
369         if (strcmp(dtype, "chrp"))
370                 return 0;
371
372         /* Cell blades firmware claims to be chrp while it's not. Until this
373          * is fixed, we need to avoid those here.
374          */
375         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
376             of_flat_dt_is_compatible(root, "IBM,CBEA"))
377                 return 0;
378
379         pr_debug("pSeries detected, looking for LPAR capability...\n");
380
381         /* Now try to figure out if we are running on LPAR */
382         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
383
384         if (firmware_has_feature(FW_FEATURE_LPAR))
385                 hpte_init_lpar();
386         else
387                 hpte_init_native();
388
389         pr_debug("Machine is%s LPAR !\n",
390                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
391
392         return 1;
393 }
394
395
396 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
397
398 static void pseries_dedicated_idle_sleep(void)
399
400         unsigned int cpu = smp_processor_id();
401         unsigned long start_snooze;
402         unsigned long in_purr, out_purr;
403
404         /*
405          * Indicate to the HV that we are idle. Now would be
406          * a good time to find other work to dispatch.
407          */
408         get_lppaca()->idle = 1;
409         get_lppaca()->donate_dedicated_cpu = 1;
410         in_purr = mfspr(SPRN_PURR);
411
412         /*
413          * We come in with interrupts disabled, and need_resched()
414          * has been checked recently.  If we should poll for a little
415          * while, do so.
416          */
417         if (__get_cpu_var(smt_snooze_delay)) {
418                 start_snooze = get_tb() +
419                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
420                 local_irq_enable();
421                 set_thread_flag(TIF_POLLING_NRFLAG);
422
423                 while (get_tb() < start_snooze) {
424                         if (need_resched() || cpu_is_offline(cpu))
425                                 goto out;
426                         ppc64_runlatch_off();
427                         HMT_low();
428                         HMT_very_low();
429                 }
430
431                 HMT_medium();
432                 clear_thread_flag(TIF_POLLING_NRFLAG);
433                 smp_mb();
434                 local_irq_disable();
435                 if (need_resched() || cpu_is_offline(cpu))
436                         goto out;
437         }
438
439         cede_processor();
440
441 out:
442         HMT_medium();
443         out_purr = mfspr(SPRN_PURR);
444         get_lppaca()->wait_state_cycles += out_purr - in_purr;
445         get_lppaca()->donate_dedicated_cpu = 0;
446         get_lppaca()->idle = 0;
447 }
448
449 static void pseries_shared_idle_sleep(void)
450 {
451         /*
452          * Indicate to the HV that we are idle. Now would be
453          * a good time to find other work to dispatch.
454          */
455         get_lppaca()->idle = 1;
456
457         /*
458          * Yield the processor to the hypervisor.  We return if
459          * an external interrupt occurs (which are driven prior
460          * to returning here) or if a prod occurs from another
461          * processor. When returning here, external interrupts
462          * are enabled.
463          */
464         cede_processor();
465
466         get_lppaca()->idle = 0;
467 }
468
469 static int pSeries_pci_probe_mode(struct pci_bus *bus)
470 {
471         if (firmware_has_feature(FW_FEATURE_LPAR))
472                 return PCI_PROBE_DEVTREE;
473         return PCI_PROBE_NORMAL;
474 }
475
476 /**
477  * pSeries_power_off - tell firmware about how to power off the system.
478  *
479  * This function calls either the power-off rtas token in normal cases
480  * or the ibm,power-off-ups token (if present & requested) in case of
481  * a power failure. If power-off token is used, power on will only be
482  * possible with power button press. If ibm,power-off-ups token is used
483  * it will allow auto poweron after power is restored.
484  */
485 static void pSeries_power_off(void)
486 {
487         int rc;
488         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
489
490         if (rtas_flash_term_hook)
491                 rtas_flash_term_hook(SYS_POWER_OFF);
492
493         if (rtas_poweron_auto == 0 ||
494                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
495                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
496                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
497         } else {
498                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
499                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
500         }
501         for (;;);
502 }
503
504 #ifndef CONFIG_PCI
505 void pSeries_final_fixup(void) { }
506 #endif
507
508 define_machine(pseries) {
509         .name                   = "pSeries",
510         .probe                  = pSeries_probe,
511         .setup_arch             = pSeries_setup_arch,
512         .init_early             = pSeries_init_early,
513         .show_cpuinfo           = pSeries_show_cpuinfo,
514         .log_error              = pSeries_log_error,
515         .pcibios_fixup          = pSeries_final_fixup,
516         .pci_probe_mode         = pSeries_pci_probe_mode,
517         .restart                = rtas_restart,
518         .power_off              = pSeries_power_off,
519         .halt                   = rtas_halt,
520         .panic                  = rtas_os_term,
521         .get_boot_time          = rtas_get_boot_time,
522         .get_rtc_time           = rtas_get_rtc_time,
523         .set_rtc_time           = rtas_set_rtc_time,
524         .calibrate_decr         = generic_calibrate_decr,
525         .progress               = rtas_progress,
526         .system_reset_exception = pSeries_system_reset_exception,
527         .machine_check_exception = pSeries_machine_check_exception,
528 };