[PATCH] ppc64: make firmware_has_feature() stronger
[linux-2.6] / arch / ppc64 / kernel / pSeries_setup.c
1 /*
2  *  linux/arch/ppc/kernel/setup.c
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/config.h>
22 #include <linux/cpu.h>
23 #include <linux/errno.h>
24 #include <linux/sched.h>
25 #include <linux/kernel.h>
26 #include <linux/mm.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/version.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>
47
48 #include <asm/mmu.h>
49 #include <asm/processor.h>
50 #include <asm/io.h>
51 #include <asm/pgtable.h>
52 #include <asm/prom.h>
53 #include <asm/rtas.h>
54 #include <asm/pci-bridge.h>
55 #include <asm/iommu.h>
56 #include <asm/dma.h>
57 #include <asm/machdep.h>
58 #include <asm/irq.h>
59 #include <asm/time.h>
60 #include <asm/nvram.h>
61 #include <asm/plpar_wrappers.h>
62 #include <asm/xics.h>
63 #include <asm/firmware.h>
64
65 #include "i8259.h"
66 #include "mpic.h"
67 #include "pci.h"
68
69 #ifdef DEBUG
70 #define DBG(fmt...) udbg_printf(fmt)
71 #else
72 #define DBG(fmt...)
73 #endif
74
75 extern void find_udbg_vterm(void);
76 extern void system_reset_fwnmi(void);   /* from head.S */
77 extern void machine_check_fwnmi(void);  /* from head.S */
78 extern void generic_find_legacy_serial_ports(u64 *physport,
79                 unsigned int *default_speed);
80
81 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
82
83 extern void pSeries_system_reset_exception(struct pt_regs *regs);
84 extern int pSeries_machine_check_exception(struct pt_regs *regs);
85
86 static int pseries_shared_idle(void);
87 static int pseries_dedicated_idle(void);
88
89 static volatile void __iomem * chrp_int_ack_special;
90 struct mpic *pSeries_mpic;
91
92 void pSeries_get_cpuinfo(struct seq_file *m)
93 {
94         struct device_node *root;
95         const char *model = "";
96
97         root = of_find_node_by_path("/");
98         if (root)
99                 model = get_property(root, "model", NULL);
100         seq_printf(m, "machine\t\t: CHRP %s\n", model);
101         of_node_put(root);
102 }
103
104 /* Initialize firmware assisted non-maskable interrupts if
105  * the firmware supports this feature.
106  *
107  */
108 static void __init fwnmi_init(void)
109 {
110         int ret;
111         int ibm_nmi_register = rtas_token("ibm,nmi-register");
112         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
113                 return;
114         ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
115                         __pa((unsigned long)system_reset_fwnmi),
116                         __pa((unsigned long)machine_check_fwnmi));
117         if (ret == 0)
118                 fwnmi_active = 1;
119 }
120
121 static int pSeries_irq_cascade(struct pt_regs *regs, void *data)
122 {
123         if (chrp_int_ack_special)
124                 return readb(chrp_int_ack_special);
125         else
126                 return i8259_irq(smp_processor_id());
127 }
128
129 static void __init pSeries_init_mpic(void)
130 {
131         unsigned int *addrp;
132         struct device_node *np;
133         int i;
134
135         /* All ISUs are setup, complete initialization */
136         mpic_init(pSeries_mpic);
137
138         /* Check what kind of cascade ACK we have */
139         if (!(np = of_find_node_by_name(NULL, "pci"))
140             || !(addrp = (unsigned int *)
141                  get_property(np, "8259-interrupt-acknowledge", NULL)))
142                 printk(KERN_ERR "Cannot find pci to get ack address\n");
143         else
144                 chrp_int_ack_special = ioremap(addrp[prom_n_addr_cells(np)-1], 1);
145         of_node_put(np);
146
147         /* Setup the legacy interrupts & controller */
148         for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
149                 irq_desc[i].handler = &i8259_pic;
150         i8259_init(0);
151
152         /* Hook cascade to mpic */
153         mpic_setup_cascade(NUM_ISA_INTERRUPTS, pSeries_irq_cascade, NULL);
154 }
155
156 static void __init pSeries_setup_mpic(void)
157 {
158         unsigned int *opprop;
159         unsigned long openpic_addr = 0;
160         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
161         struct device_node *root;
162         int irq_count;
163
164         /* Find the Open PIC if present */
165         root = of_find_node_by_path("/");
166         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
167         if (opprop != 0) {
168                 int n = prom_n_addr_cells(root);
169
170                 for (openpic_addr = 0; n > 0; --n)
171                         openpic_addr = (openpic_addr << 32) + *opprop++;
172                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
173         }
174         of_node_put(root);
175
176         BUG_ON(openpic_addr == 0);
177
178         /* Get the sense values from OF */
179         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
180         
181         /* Setup the openpic driver */
182         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
183         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
184                                   16, 16, irq_count, /* isu size, irq offset, irq count */ 
185                                   NR_IRQS - 4, /* ipi offset */
186                                   senses, irq_count, /* sense & sense size */
187                                   " MPIC     ");
188 }
189
190 static void __init pSeries_setup_arch(void)
191 {
192         /* Fixup ppc_md depending on the type of interrupt controller */
193         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
194                 ppc_md.init_IRQ       = pSeries_init_mpic;
195                 ppc_md.get_irq        = mpic_get_irq;
196                 ppc_md.cpu_irq_down   = mpic_teardown_this_cpu;
197                 /* Allocate the mpic now, so that find_and_init_phbs() can
198                  * fill the ISUs */
199                 pSeries_setup_mpic();
200         } else {
201                 ppc_md.init_IRQ       = xics_init_IRQ;
202                 ppc_md.get_irq        = xics_get_irq;
203                 ppc_md.cpu_irq_down   = xics_teardown_cpu;
204         }
205
206 #ifdef CONFIG_SMP
207         smp_init_pSeries();
208 #endif
209         /* openpic global configuration register (64-bit format). */
210         /* openpic Interrupt Source Unit pointer (64-bit format). */
211         /* python0 facility area (mmio) (64-bit format) REAL address. */
212
213         /* init to some ~sane value until calibrate_delay() runs */
214         loops_per_jiffy = 50000000;
215
216         if (ROOT_DEV == 0) {
217                 printk("No ramdisk, default root is /dev/sda2\n");
218                 ROOT_DEV = Root_SDA2;
219         }
220
221         fwnmi_init();
222
223         /* Find and initialize PCI host bridges */
224         init_pci_config_tokens();
225         eeh_init();
226         find_and_init_phbs();
227
228 #ifdef CONFIG_DUMMY_CONSOLE
229         conswitchp = &dummy_con;
230 #endif
231
232         pSeries_nvram_init();
233
234         /* Choose an idle loop */
235         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
236                 vpa_init(boot_cpuid);
237                 if (get_paca()->lppaca.shared_proc) {
238                         printk(KERN_INFO "Using shared processor idle loop\n");
239                         ppc_md.idle_loop = pseries_shared_idle;
240                 } else {
241                         printk(KERN_INFO "Using dedicated idle loop\n");
242                         ppc_md.idle_loop = pseries_dedicated_idle;
243                 }
244         } else {
245                 printk(KERN_INFO "Using default idle loop\n");
246                 ppc_md.idle_loop = default_idle;
247         }
248 }
249
250 static int __init pSeries_init_panel(void)
251 {
252         /* Manually leave the kernel version on the panel. */
253         ppc_md.progress("Linux ppc64\n", 0);
254         ppc_md.progress(UTS_RELEASE, 0);
255
256         return 0;
257 }
258 arch_initcall(pSeries_init_panel);
259
260
261 /* Build up the ppc64_firmware_features bitmask field
262  * using contents of device-tree/ibm,hypertas-functions.
263  * Ultimately this functionality may be moved into prom.c prom_init().
264  */
265 void __init fw_feature_init(void)
266 {
267         struct device_node * dn;
268         char * hypertas;
269         unsigned int len;
270
271         DBG(" -> fw_feature_init()\n");
272
273         ppc64_firmware_features = 0;
274         dn = of_find_node_by_path("/rtas");
275         if (dn == NULL) {
276                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
277                 goto no_rtas;
278         }
279
280         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
281         if (hypertas) {
282                 while (len > 0){
283                         int i, hypertas_len;
284                         /* check value against table of strings */
285                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
286                                 if ((firmware_features_table[i].name) &&
287                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
288                                         /* we have a match */
289                                         ppc64_firmware_features |= 
290                                                 (firmware_features_table[i].val);
291                                         break;
292                                 } 
293                         }
294                         hypertas_len = strlen(hypertas);
295                         len -= hypertas_len +1;
296                         hypertas+= hypertas_len +1;
297                 }
298         }
299
300         of_node_put(dn);
301  no_rtas:
302         printk(KERN_INFO "firmware_features = 0x%lx\n", 
303                ppc64_firmware_features);
304
305         DBG(" <- fw_feature_init()\n");
306 }
307
308
309 static  void __init pSeries_discover_pic(void)
310 {
311         struct device_node *np;
312         char *typep;
313
314         /*
315          * Setup interrupt mapping options that are needed for finish_device_tree
316          * to properly parse the OF interrupt tree & do the virtual irq mapping
317          */
318         __irq_offset_value = NUM_ISA_INTERRUPTS;
319         ppc64_interrupt_controller = IC_INVALID;
320         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
321                 typep = (char *)get_property(np, "compatible", NULL);
322                 if (strstr(typep, "open-pic"))
323                         ppc64_interrupt_controller = IC_OPEN_PIC;
324                 else if (strstr(typep, "ppc-xicp"))
325                         ppc64_interrupt_controller = IC_PPC_XIC;
326                 else
327                         printk("pSeries_discover_pic: failed to recognize"
328                                " interrupt-controller\n");
329                 break;
330         }
331 }
332
333 static void pSeries_mach_cpu_die(void)
334 {
335         local_irq_disable();
336         idle_task_exit();
337         /* Some hardware requires clearing the CPPR, while other hardware does not
338          * it is safe either way
339          */
340         pSeriesLP_cppr_info(0, 0);
341         rtas_stop_self();
342         /* Should never get here... */
343         BUG();
344         for(;;);
345 }
346
347
348 /*
349  * Early initialization.  Relocation is on but do not reference unbolted pages
350  */
351 static void __init pSeries_init_early(void)
352 {
353         void *comport;
354         int iommu_off = 0;
355         unsigned int default_speed;
356         u64 physport;
357
358         DBG(" -> pSeries_init_early()\n");
359
360         fw_feature_init();
361         
362         if (systemcfg->platform & PLATFORM_LPAR)
363                 hpte_init_lpar();
364         else {
365                 hpte_init_native();
366                 iommu_off = (of_chosen &&
367                              get_property(of_chosen, "linux,iommu-off", NULL));
368         }
369
370         generic_find_legacy_serial_ports(&physport, &default_speed);
371
372         if (systemcfg->platform & PLATFORM_LPAR)
373                 find_udbg_vterm();
374         else if (physport) {
375                 /* Map the uart for udbg. */
376                 comport = (void *)ioremap(physport, 16);
377                 udbg_init_uart(comport, default_speed);
378
379                 ppc_md.udbg_putc = udbg_putc;
380                 ppc_md.udbg_getc = udbg_getc;
381                 ppc_md.udbg_getc_poll = udbg_getc_poll;
382                 DBG("Hello World !\n");
383         }
384
385
386         iommu_init_early_pSeries();
387
388         pSeries_discover_pic();
389
390         DBG(" <- pSeries_init_early()\n");
391 }
392
393
394 static int pSeries_check_legacy_ioport(unsigned int baseport)
395 {
396         struct device_node *np;
397
398 #define I8042_DATA_REG  0x60
399 #define FDC_BASE        0x3f0
400
401
402         switch(baseport) {
403         case I8042_DATA_REG:
404                 np = of_find_node_by_type(NULL, "8042");
405                 if (np == NULL)
406                         return -ENODEV;
407                 of_node_put(np);
408                 break;
409         case FDC_BASE:
410                 np = of_find_node_by_type(NULL, "fdc");
411                 if (np == NULL)
412                         return -ENODEV;
413                 of_node_put(np);
414                 break;
415         }
416         return 0;
417 }
418
419 /*
420  * Called very early, MMU is off, device-tree isn't unflattened
421  */
422 extern struct machdep_calls pSeries_md;
423
424 static int __init pSeries_probe(int platform)
425 {
426         if (platform != PLATFORM_PSERIES &&
427             platform != PLATFORM_PSERIES_LPAR)
428                 return 0;
429
430         /* if we have some ppc_md fixups for LPAR to do, do
431          * it here ...
432          */
433
434         return 1;
435 }
436
437 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
438
439 static inline void dedicated_idle_sleep(unsigned int cpu)
440 {
441         struct paca_struct *ppaca = &paca[cpu ^ 1];
442
443         /* Only sleep if the other thread is not idle */
444         if (!(ppaca->lppaca.idle)) {
445                 local_irq_disable();
446
447                 /*
448                  * We are about to sleep the thread and so wont be polling any
449                  * more.
450                  */
451                 clear_thread_flag(TIF_POLLING_NRFLAG);
452
453                 /*
454                  * SMT dynamic mode. Cede will result in this thread going
455                  * dormant, if the partner thread is still doing work.  Thread
456                  * wakes up if partner goes idle, an interrupt is presented, or
457                  * a prod occurs.  Returning from the cede enables external
458                  * interrupts.
459                  */
460                 if (!need_resched())
461                         cede_processor();
462                 else
463                         local_irq_enable();
464         } else {
465                 /*
466                  * Give the HV an opportunity at the processor, since we are
467                  * not doing any work.
468                  */
469                 poll_pending();
470         }
471 }
472
473 static int pseries_dedicated_idle(void)
474 {
475         long oldval;
476         struct paca_struct *lpaca = get_paca();
477         unsigned int cpu = smp_processor_id();
478         unsigned long start_snooze;
479         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
480
481         while (1) {
482                 /*
483                  * Indicate to the HV that we are idle. Now would be
484                  * a good time to find other work to dispatch.
485                  */
486                 lpaca->lppaca.idle = 1;
487
488                 oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
489                 if (!oldval) {
490                         set_thread_flag(TIF_POLLING_NRFLAG);
491
492                         start_snooze = __get_tb() +
493                                 *smt_snooze_delay * tb_ticks_per_usec;
494
495                         while (!need_resched() && !cpu_is_offline(cpu)) {
496                                 ppc64_runlatch_off();
497
498                                 /*
499                                  * Go into low thread priority and possibly
500                                  * low power mode.
501                                  */
502                                 HMT_low();
503                                 HMT_very_low();
504
505                                 if (*smt_snooze_delay != 0 &&
506                                     __get_tb() > start_snooze) {
507                                         HMT_medium();
508                                         dedicated_idle_sleep(cpu);
509                                 }
510
511                         }
512
513                         HMT_medium();
514                         clear_thread_flag(TIF_POLLING_NRFLAG);
515                 } else {
516                         set_need_resched();
517                 }
518
519                 lpaca->lppaca.idle = 0;
520                 ppc64_runlatch_on();
521
522                 schedule();
523
524                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
525                         cpu_die();
526         }
527 }
528
529 static int pseries_shared_idle(void)
530 {
531         struct paca_struct *lpaca = get_paca();
532         unsigned int cpu = smp_processor_id();
533
534         while (1) {
535                 /*
536                  * Indicate to the HV that we are idle. Now would be
537                  * a good time to find other work to dispatch.
538                  */
539                 lpaca->lppaca.idle = 1;
540
541                 while (!need_resched() && !cpu_is_offline(cpu)) {
542                         local_irq_disable();
543                         ppc64_runlatch_off();
544
545                         /*
546                          * Yield the processor to the hypervisor.  We return if
547                          * an external interrupt occurs (which are driven prior
548                          * to returning here) or if a prod occurs from another
549                          * processor. When returning here, external interrupts
550                          * are enabled.
551                          *
552                          * Check need_resched() again with interrupts disabled
553                          * to avoid a race.
554                          */
555                         if (!need_resched())
556                                 cede_processor();
557                         else
558                                 local_irq_enable();
559
560                         HMT_medium();
561                 }
562
563                 lpaca->lppaca.idle = 0;
564                 ppc64_runlatch_on();
565
566                 schedule();
567
568                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
569                         cpu_die();
570         }
571
572         return 0;
573 }
574
575 struct machdep_calls __initdata pSeries_md = {
576         .probe                  = pSeries_probe,
577         .setup_arch             = pSeries_setup_arch,
578         .init_early             = pSeries_init_early,
579         .get_cpuinfo            = pSeries_get_cpuinfo,
580         .log_error              = pSeries_log_error,
581         .pcibios_fixup          = pSeries_final_fixup,
582         .irq_bus_setup          = pSeries_irq_bus_setup,
583         .restart                = rtas_restart,
584         .power_off              = rtas_power_off,
585         .halt                   = rtas_halt,
586         .panic                  = rtas_os_term,
587         .cpu_die                = pSeries_mach_cpu_die,
588         .get_boot_time          = rtas_get_boot_time,
589         .get_rtc_time           = rtas_get_rtc_time,
590         .set_rtc_time           = rtas_set_rtc_time,
591         .calibrate_decr         = generic_calibrate_decr,
592         .progress               = rtas_progress,
593         .check_legacy_ioport    = pSeries_check_legacy_ioport,
594         .system_reset_exception = pSeries_system_reset_exception,
595         .machine_check_exception = pSeries_machine_check_exception,
596 };