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Linux/arch/powerpc/platforms/powermac/setup.c

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  1 /*
  2  *  Powermac setup and early boot code plus other random bits.
  3  *
  4  *  PowerPC version
  5  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  6  *
  7  *  Adapted for Power Macintosh by Paul Mackerras
  8  *    Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
  9  *
 10  *  Derived from "arch/alpha/kernel/setup.c"
 11  *    Copyright (C) 1995 Linus Torvalds
 12  *
 13  *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
 14  *
 15  *  This program is free software; you can redistribute it and/or
 16  *  modify it under the terms of the GNU General Public License
 17  *  as published by the Free Software Foundation; either version
 18  *  2 of the License, or (at your option) any later version.
 19  *
 20  */
 21 
 22 /*
 23  * bootup setup stuff..
 24  */
 25 
 26 #include <linux/init.h>
 27 #include <linux/errno.h>
 28 #include <linux/sched.h>
 29 #include <linux/kernel.h>
 30 #include <linux/mm.h>
 31 #include <linux/stddef.h>
 32 #include <linux/unistd.h>
 33 #include <linux/ptrace.h>
 34 #include <linux/export.h>
 35 #include <linux/user.h>
 36 #include <linux/tty.h>
 37 #include <linux/string.h>
 38 #include <linux/delay.h>
 39 #include <linux/ioport.h>
 40 #include <linux/major.h>
 41 #include <linux/initrd.h>
 42 #include <linux/vt_kern.h>
 43 #include <linux/console.h>
 44 #include <linux/pci.h>
 45 #include <linux/adb.h>
 46 #include <linux/cuda.h>
 47 #include <linux/pmu.h>
 48 #include <linux/irq.h>
 49 #include <linux/seq_file.h>
 50 #include <linux/root_dev.h>
 51 #include <linux/bitops.h>
 52 #include <linux/suspend.h>
 53 #include <linux/of_device.h>
 54 #include <linux/of_platform.h>
 55 #include <linux/memblock.h>
 56 
 57 #include <asm/reg.h>
 58 #include <asm/sections.h>
 59 #include <asm/prom.h>
 60 #include <asm/pgtable.h>
 61 #include <asm/io.h>
 62 #include <asm/pci-bridge.h>
 63 #include <asm/ohare.h>
 64 #include <asm/mediabay.h>
 65 #include <asm/machdep.h>
 66 #include <asm/dma.h>
 67 #include <asm/cputable.h>
 68 #include <asm/btext.h>
 69 #include <asm/pmac_feature.h>
 70 #include <asm/time.h>
 71 #include <asm/mmu_context.h>
 72 #include <asm/iommu.h>
 73 #include <asm/smu.h>
 74 #include <asm/pmc.h>
 75 #include <asm/udbg.h>
 76 
 77 #include "pmac.h"
 78 
 79 #undef SHOW_GATWICK_IRQS
 80 
 81 int ppc_override_l2cr = 0;
 82 int ppc_override_l2cr_value;
 83 int has_l2cache = 0;
 84 
 85 int pmac_newworld;
 86 
 87 static int current_root_goodness = -1;
 88 
 89 extern struct machdep_calls pmac_md;
 90 
 91 #define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
 92 
 93 #ifdef CONFIG_PPC64
 94 int sccdbg;
 95 #endif
 96 
 97 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
 98 EXPORT_SYMBOL(sys_ctrler);
 99 
100 #ifdef CONFIG_PMAC_SMU
101 unsigned long smu_cmdbuf_abs;
102 EXPORT_SYMBOL(smu_cmdbuf_abs);
103 #endif
104 
105 static void pmac_show_cpuinfo(struct seq_file *m)
106 {
107         struct device_node *np;
108         const char *pp;
109         int plen;
110         int mbmodel;
111         unsigned int mbflags;
112         char* mbname;
113 
114         mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
115                                     PMAC_MB_INFO_MODEL, 0);
116         mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
117                                     PMAC_MB_INFO_FLAGS, 0);
118         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
119                               (long) &mbname) != 0)
120                 mbname = "Unknown";
121 
122         /* find motherboard type */
123         seq_printf(m, "machine\t\t: ");
124         np = of_find_node_by_path("/");
125         if (np != NULL) {
126                 pp = of_get_property(np, "model", NULL);
127                 if (pp != NULL)
128                         seq_printf(m, "%s\n", pp);
129                 else
130                         seq_printf(m, "PowerMac\n");
131                 pp = of_get_property(np, "compatible", &plen);
132                 if (pp != NULL) {
133                         seq_printf(m, "motherboard\t:");
134                         while (plen > 0) {
135                                 int l = strlen(pp) + 1;
136                                 seq_printf(m, " %s", pp);
137                                 plen -= l;
138                                 pp += l;
139                         }
140                         seq_printf(m, "\n");
141                 }
142                 of_node_put(np);
143         } else
144                 seq_printf(m, "PowerMac\n");
145 
146         /* print parsed model */
147         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
148         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
149 
150         /* find l2 cache info */
151         np = of_find_node_by_name(NULL, "l2-cache");
152         if (np == NULL)
153                 np = of_find_node_by_type(NULL, "cache");
154         if (np != NULL) {
155                 const unsigned int *ic =
156                         of_get_property(np, "i-cache-size", NULL);
157                 const unsigned int *dc =
158                         of_get_property(np, "d-cache-size", NULL);
159                 seq_printf(m, "L2 cache\t:");
160                 has_l2cache = 1;
161                 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
162                         seq_printf(m, " %dK unified", *dc / 1024);
163                 } else {
164                         if (ic)
165                                 seq_printf(m, " %dK instruction", *ic / 1024);
166                         if (dc)
167                                 seq_printf(m, "%s %dK data",
168                                            (ic? " +": ""), *dc / 1024);
169                 }
170                 pp = of_get_property(np, "ram-type", NULL);
171                 if (pp)
172                         seq_printf(m, " %s", pp);
173                 seq_printf(m, "\n");
174                 of_node_put(np);
175         }
176 
177         /* Indicate newworld/oldworld */
178         seq_printf(m, "pmac-generation\t: %s\n",
179                    pmac_newworld ? "NewWorld" : "OldWorld");
180 }
181 
182 #ifndef CONFIG_ADB_CUDA
183 int find_via_cuda(void)
184 {
185         struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
186 
187         if (!dn)
188                 return 0;
189         of_node_put(dn);
190         printk("WARNING ! Your machine is CUDA-based but your kernel\n");
191         printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
192         return 0;
193 }
194 #endif
195 
196 #ifndef CONFIG_ADB_PMU
197 int find_via_pmu(void)
198 {
199         struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
200 
201         if (!dn)
202                 return 0;
203         of_node_put(dn);
204         printk("WARNING ! Your machine is PMU-based but your kernel\n");
205         printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
206         return 0;
207 }
208 #endif
209 
210 #ifndef CONFIG_PMAC_SMU
211 int smu_init(void)
212 {
213         /* should check and warn if SMU is present */
214         return 0;
215 }
216 #endif
217 
218 #ifdef CONFIG_PPC32
219 static volatile u32 *sysctrl_regs;
220 
221 static void __init ohare_init(void)
222 {
223         struct device_node *dn;
224 
225         /* this area has the CPU identification register
226            and some registers used by smp boards */
227         sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
228 
229         /*
230          * Turn on the L2 cache.
231          * We assume that we have a PSX memory controller iff
232          * we have an ohare I/O controller.
233          */
234         dn = of_find_node_by_name(NULL, "ohare");
235         if (dn) {
236                 of_node_put(dn);
237                 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
238                         if (sysctrl_regs[4] & 0x10)
239                                 sysctrl_regs[4] |= 0x04000020;
240                         else
241                                 sysctrl_regs[4] |= 0x04000000;
242                         if(has_l2cache)
243                                 printk(KERN_INFO "Level 2 cache enabled\n");
244                 }
245         }
246 }
247 
248 static void __init l2cr_init(void)
249 {
250         /* Checks "l2cr-value" property in the registry */
251         if (cpu_has_feature(CPU_FTR_L2CR)) {
252                 struct device_node *np = of_find_node_by_name(NULL, "cpus");
253                 if (np == 0)
254                         np = of_find_node_by_type(NULL, "cpu");
255                 if (np != 0) {
256                         const unsigned int *l2cr =
257                                 of_get_property(np, "l2cr-value", NULL);
258                         if (l2cr != 0) {
259                                 ppc_override_l2cr = 1;
260                                 ppc_override_l2cr_value = *l2cr;
261                                 _set_L2CR(0);
262                                 _set_L2CR(ppc_override_l2cr_value);
263                         }
264                         of_node_put(np);
265                 }
266         }
267 
268         if (ppc_override_l2cr)
269                 printk(KERN_INFO "L2CR overridden (0x%x), "
270                        "backside cache is %s\n",
271                        ppc_override_l2cr_value,
272                        (ppc_override_l2cr_value & 0x80000000)
273                                 ? "enabled" : "disabled");
274 }
275 #endif
276 
277 static void __init pmac_setup_arch(void)
278 {
279         struct device_node *cpu, *ic;
280         const int *fp;
281         unsigned long pvr;
282 
283         pvr = PVR_VER(mfspr(SPRN_PVR));
284 
285         /* Set loops_per_jiffy to a half-way reasonable value,
286            for use until calibrate_delay gets called. */
287         loops_per_jiffy = 50000000 / HZ;
288         cpu = of_find_node_by_type(NULL, "cpu");
289         if (cpu != NULL) {
290                 fp = of_get_property(cpu, "clock-frequency", NULL);
291                 if (fp != NULL) {
292                         if (pvr >= 0x30 && pvr < 0x80)
293                                 /* PPC970 etc. */
294                                 loops_per_jiffy = *fp / (3 * HZ);
295                         else if (pvr == 4 || pvr >= 8)
296                                 /* 604, G3, G4 etc. */
297                                 loops_per_jiffy = *fp / HZ;
298                         else
299                                 /* 601, 603, etc. */
300                                 loops_per_jiffy = *fp / (2 * HZ);
301                 }
302                 of_node_put(cpu);
303         }
304 
305         /* See if newworld or oldworld */
306         ic = of_find_node_with_property(NULL, "interrupt-controller");
307         if (ic) {
308                 pmac_newworld = 1;
309                 of_node_put(ic);
310         }
311 
312         /* Lookup PCI hosts */
313         pmac_pci_init();
314 
315 #ifdef CONFIG_PPC32
316         ohare_init();
317         l2cr_init();
318 #endif /* CONFIG_PPC32 */
319 
320         find_via_cuda();
321         find_via_pmu();
322         smu_init();
323 
324 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
325     defined(CONFIG_PPC64)
326         pmac_nvram_init();
327 #endif
328 
329 #ifdef CONFIG_PPC32
330 #ifdef CONFIG_BLK_DEV_INITRD
331         if (initrd_start)
332                 ROOT_DEV = Root_RAM0;
333         else
334 #endif
335                 ROOT_DEV = DEFAULT_ROOT_DEVICE;
336 #endif
337 
338 #ifdef CONFIG_ADB
339         if (strstr(cmd_line, "adb_sync")) {
340                 extern int __adb_probe_sync;
341                 __adb_probe_sync = 1;
342         }
343 #endif /* CONFIG_ADB */
344 }
345 
346 #ifdef CONFIG_SCSI
347 void note_scsi_host(struct device_node *node, void *host)
348 {
349 }
350 EXPORT_SYMBOL(note_scsi_host);
351 #endif
352 
353 static int initializing = 1;
354 
355 static int pmac_late_init(void)
356 {
357         initializing = 0;
358         return 0;
359 }
360 machine_late_initcall(powermac, pmac_late_init);
361 
362 /*
363  * This is __init_refok because we check for "initializing" before
364  * touching any of the __init sensitive things and "initializing"
365  * will be false after __init time. This can't be __init because it
366  * can be called whenever a disk is first accessed.
367  */
368 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
369 {
370         char *p;
371 
372         if (!initializing)
373                 return;
374         if ((goodness <= current_root_goodness) &&
375             ROOT_DEV != DEFAULT_ROOT_DEVICE)
376                 return;
377         p = strstr(boot_command_line, "root=");
378         if (p != NULL && (p == boot_command_line || p[-1] == ' '))
379                 return;
380 
381         ROOT_DEV = dev + part;
382         current_root_goodness = goodness;
383 }
384 
385 #ifdef CONFIG_ADB_CUDA
386 static void cuda_restart(void)
387 {
388         struct adb_request req;
389 
390         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
391         for (;;)
392                 cuda_poll();
393 }
394 
395 static void cuda_shutdown(void)
396 {
397         struct adb_request req;
398 
399         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
400         for (;;)
401                 cuda_poll();
402 }
403 
404 #else
405 #define cuda_restart()
406 #define cuda_shutdown()
407 #endif
408 
409 #ifndef CONFIG_ADB_PMU
410 #define pmu_restart()
411 #define pmu_shutdown()
412 #endif
413 
414 #ifndef CONFIG_PMAC_SMU
415 #define smu_restart()
416 #define smu_shutdown()
417 #endif
418 
419 static void pmac_restart(char *cmd)
420 {
421         switch (sys_ctrler) {
422         case SYS_CTRLER_CUDA:
423                 cuda_restart();
424                 break;
425         case SYS_CTRLER_PMU:
426                 pmu_restart();
427                 break;
428         case SYS_CTRLER_SMU:
429                 smu_restart();
430                 break;
431         default: ;
432         }
433 }
434 
435 static void pmac_power_off(void)
436 {
437         switch (sys_ctrler) {
438         case SYS_CTRLER_CUDA:
439                 cuda_shutdown();
440                 break;
441         case SYS_CTRLER_PMU:
442                 pmu_shutdown();
443                 break;
444         case SYS_CTRLER_SMU:
445                 smu_shutdown();
446                 break;
447         default: ;
448         }
449 }
450 
451 static void
452 pmac_halt(void)
453 {
454         pmac_power_off();
455 }
456 
457 /* 
458  * Early initialization.
459  */
460 static void __init pmac_init_early(void)
461 {
462         /* Enable early btext debug if requested */
463         if (strstr(cmd_line, "btextdbg")) {
464                 udbg_adb_init_early();
465                 register_early_udbg_console();
466         }
467 
468         /* Probe motherboard chipset */
469         pmac_feature_init();
470 
471         /* Initialize debug stuff */
472         udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
473         udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
474 
475 #ifdef CONFIG_PPC64
476         iommu_init_early_dart();
477 #endif
478 
479         /* SMP Init has to be done early as we need to patch up
480          * cpu_possible_mask before interrupt stacks are allocated
481          * or kaboom...
482          */
483 #ifdef CONFIG_SMP
484         pmac_setup_smp();
485 #endif
486 }
487 
488 static int __init pmac_declare_of_platform_devices(void)
489 {
490         struct device_node *np;
491 
492         if (machine_is(chrp))
493                 return -1;
494 
495         np = of_find_node_by_name(NULL, "valkyrie");
496         if (np) {
497                 of_platform_device_create(np, "valkyrie", NULL);
498                 of_node_put(np);
499         }
500         np = of_find_node_by_name(NULL, "platinum");
501         if (np) {
502                 of_platform_device_create(np, "platinum", NULL);
503                 of_node_put(np);
504         }
505         np = of_find_node_by_type(NULL, "smu");
506         if (np) {
507                 of_platform_device_create(np, "smu", NULL);
508                 of_node_put(np);
509         }
510         np = of_find_node_by_type(NULL, "fcu");
511         if (np == NULL) {
512                 /* Some machines have strangely broken device-tree */
513                 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
514         }
515         if (np) {
516                 of_platform_device_create(np, "temperature", NULL);
517                 of_node_put(np);
518         }
519 
520         return 0;
521 }
522 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
523 
524 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
525 /*
526  * This is called very early, as part of console_init() (typically just after
527  * time_init()). This function is respondible for trying to find a good
528  * default console on serial ports. It tries to match the open firmware
529  * default output with one of the available serial console drivers.
530  */
531 static int __init check_pmac_serial_console(void)
532 {
533         struct device_node *prom_stdout = NULL;
534         int offset = 0;
535         const char *name;
536 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
537         char *devname = "ttyS";
538 #else
539         char *devname = "ttyPZ";
540 #endif
541 
542         pr_debug(" -> check_pmac_serial_console()\n");
543 
544         /* The user has requested a console so this is already set up. */
545         if (strstr(boot_command_line, "console=")) {
546                 pr_debug(" console was specified !\n");
547                 return -EBUSY;
548         }
549 
550         if (!of_chosen) {
551                 pr_debug(" of_chosen is NULL !\n");
552                 return -ENODEV;
553         }
554 
555         /* We are getting a weird phandle from OF ... */
556         /* ... So use the full path instead */
557         name = of_get_property(of_chosen, "linux,stdout-path", NULL);
558         if (name == NULL) {
559                 pr_debug(" no linux,stdout-path !\n");
560                 return -ENODEV;
561         }
562         prom_stdout = of_find_node_by_path(name);
563         if (!prom_stdout) {
564                 pr_debug(" can't find stdout package %s !\n", name);
565                 return -ENODEV;
566         }
567         pr_debug("stdout is %s\n", prom_stdout->full_name);
568 
569         name = of_get_property(prom_stdout, "name", NULL);
570         if (!name) {
571                 pr_debug(" stdout package has no name !\n");
572                 goto not_found;
573         }
574 
575         if (strcmp(name, "ch-a") == 0)
576                 offset = 0;
577         else if (strcmp(name, "ch-b") == 0)
578                 offset = 1;
579         else
580                 goto not_found;
581         of_node_put(prom_stdout);
582 
583         pr_debug("Found serial console at %s%d\n", devname, offset);
584 
585         return add_preferred_console(devname, offset, NULL);
586 
587  not_found:
588         pr_debug("No preferred console found !\n");
589         of_node_put(prom_stdout);
590         return -ENODEV;
591 }
592 console_initcall(check_pmac_serial_console);
593 
594 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
595 
596 /*
597  * Called very early, MMU is off, device-tree isn't unflattened
598  */
599 static int __init pmac_probe(void)
600 {
601         unsigned long root = of_get_flat_dt_root();
602 
603         if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
604             !of_flat_dt_is_compatible(root, "MacRISC"))
605                 return 0;
606 
607 #ifdef CONFIG_PPC64
608         /*
609          * On U3, the DART (iommu) must be allocated now since it
610          * has an impact on htab_initialize (due to the large page it
611          * occupies having to be broken up so the DART itself is not
612          * part of the cacheable linar mapping
613          */
614         alloc_dart_table();
615 
616         hpte_init_native();
617 #endif
618 
619 #ifdef CONFIG_PPC32
620         /* isa_io_base gets set in pmac_pci_init */
621         ISA_DMA_THRESHOLD = ~0L;
622         DMA_MODE_READ = 1;
623         DMA_MODE_WRITE = 2;
624 #endif /* CONFIG_PPC32 */
625 
626 #ifdef CONFIG_PMAC_SMU
627         /*
628          * SMU based G5s need some memory below 2Gb, at least the current
629          * driver needs that. We have to allocate it now. We allocate 4k
630          * (1 small page) for now.
631          */
632         smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
633 #endif /* CONFIG_PMAC_SMU */
634 
635         return 1;
636 }
637 
638 #ifdef CONFIG_PPC64
639 /* Move that to pci.c */
640 static int pmac_pci_probe_mode(struct pci_bus *bus)
641 {
642         struct device_node *node = pci_bus_to_OF_node(bus);
643 
644         /* We need to use normal PCI probing for the AGP bus,
645          * since the device for the AGP bridge isn't in the tree.
646          * Same for the PCIe host on U4 and the HT host bridge.
647          */
648         if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
649                                   of_device_is_compatible(node, "u4-pcie") ||
650                                   of_device_is_compatible(node, "u3-ht")))
651                 return PCI_PROBE_NORMAL;
652         return PCI_PROBE_DEVTREE;
653 }
654 #endif /* CONFIG_PPC64 */
655 
656 define_machine(powermac) {
657         .name                   = "PowerMac",
658         .probe                  = pmac_probe,
659         .setup_arch             = pmac_setup_arch,
660         .init_early             = pmac_init_early,
661         .show_cpuinfo           = pmac_show_cpuinfo,
662         .init_IRQ               = pmac_pic_init,
663         .get_irq                = NULL, /* changed later */
664         .pci_irq_fixup          = pmac_pci_irq_fixup,
665         .restart                = pmac_restart,
666         .power_off              = pmac_power_off,
667         .halt                   = pmac_halt,
668         .time_init              = pmac_time_init,
669         .get_boot_time          = pmac_get_boot_time,
670         .set_rtc_time           = pmac_set_rtc_time,
671         .get_rtc_time           = pmac_get_rtc_time,
672         .calibrate_decr         = pmac_calibrate_decr,
673         .feature_call           = pmac_do_feature_call,
674         .progress               = udbg_progress,
675 #ifdef CONFIG_PPC64
676         .pci_probe_mode         = pmac_pci_probe_mode,
677         .power_save             = power4_idle,
678         .enable_pmcs            = power4_enable_pmcs,
679 #endif /* CONFIG_PPC64 */
680 #ifdef CONFIG_PPC32
681         .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
682         .pcibios_after_init     = pmac_pcibios_after_init,
683         .phys_mem_access_prot   = pci_phys_mem_access_prot,
684 #endif
685 };
686 

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