1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Powermac setup and early boot code plus other random bits.
4 *
5 * PowerPC version
6 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 *
8 * Adapted for Power Macintosh by Paul Mackerras
9 * Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
10 *
11 * Derived from "arch/alpha/kernel/setup.c"
12 * Copyright (C) 1995 Linus Torvalds
13 *
14 * Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
15 */
16
17 /*
18 * bootup setup stuff..
19 */
20
21 #include <linux/init.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/ptrace.h>
29 #include <linux/export.h>
30 #include <linux/user.h>
31 #include <linux/tty.h>
32 #include <linux/string.h>
33 #include <linux/delay.h>
34 #include <linux/ioport.h>
35 #include <linux/major.h>
36 #include <linux/initrd.h>
37 #include <linux/vt_kern.h>
38 #include <linux/console.h>
39 #include <linux/pci.h>
40 #include <linux/adb.h>
41 #include <linux/cuda.h>
42 #include <linux/pmu.h>
43 #include <linux/irq.h>
44 #include <linux/seq_file.h>
45 #include <linux/root_dev.h>
46 #include <linux/bitops.h>
47 #include <linux/suspend.h>
48 #include <linux/of_device.h>
49 #include <linux/of_platform.h>
50
51 #include <asm/reg.h>
52 #include <asm/sections.h>
53 #include <asm/prom.h>
54 #include <asm/io.h>
55 #include <asm/pci-bridge.h>
56 #include <asm/ohare.h>
57 #include <asm/mediabay.h>
58 #include <asm/machdep.h>
59 #include <asm/dma.h>
60 #include <asm/cputable.h>
61 #include <asm/btext.h>
62 #include <asm/pmac_feature.h>
63 #include <asm/time.h>
64 #include <asm/mmu_context.h>
65 #include <asm/iommu.h>
66 #include <asm/smu.h>
67 #include <asm/pmc.h>
68 #include <asm/udbg.h>
69
70 #include "pmac.h"
71
72 #undef SHOW_GATWICK_IRQS
73
74 int ppc_override_l2cr = 0;
75 int ppc_override_l2cr_value;
76 int has_l2cache = 0;
77
78 int pmac_newworld;
79
80 static int current_root_goodness = -1;
81
82 extern struct machdep_calls pmac_md;
83
84 #define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */
85
86 #ifdef CONFIG_PPC64
87 int sccdbg;
88 #endif
89
90 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
91 EXPORT_SYMBOL(sys_ctrler);
92
pmac_show_cpuinfo(struct seq_file * m)93 static void pmac_show_cpuinfo(struct seq_file *m)
94 {
95 struct device_node *np;
96 const char *pp;
97 int plen;
98 int mbmodel;
99 unsigned int mbflags;
100 char* mbname;
101
102 mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
103 PMAC_MB_INFO_MODEL, 0);
104 mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
105 PMAC_MB_INFO_FLAGS, 0);
106 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
107 (long) &mbname) != 0)
108 mbname = "Unknown";
109
110 /* find motherboard type */
111 seq_printf(m, "machine\t\t: ");
112 np = of_find_node_by_path("/");
113 if (np != NULL) {
114 pp = of_get_property(np, "model", NULL);
115 if (pp != NULL)
116 seq_printf(m, "%s\n", pp);
117 else
118 seq_printf(m, "PowerMac\n");
119 pp = of_get_property(np, "compatible", &plen);
120 if (pp != NULL) {
121 seq_printf(m, "motherboard\t:");
122 while (plen > 0) {
123 int l = strlen(pp) + 1;
124 seq_printf(m, " %s", pp);
125 plen -= l;
126 pp += l;
127 }
128 seq_printf(m, "\n");
129 }
130 of_node_put(np);
131 } else
132 seq_printf(m, "PowerMac\n");
133
134 /* print parsed model */
135 seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
136 seq_printf(m, "pmac flags\t: %08x\n", mbflags);
137
138 /* find l2 cache info */
139 np = of_find_node_by_name(NULL, "l2-cache");
140 if (np == NULL)
141 np = of_find_node_by_type(NULL, "cache");
142 if (np != NULL) {
143 const unsigned int *ic =
144 of_get_property(np, "i-cache-size", NULL);
145 const unsigned int *dc =
146 of_get_property(np, "d-cache-size", NULL);
147 seq_printf(m, "L2 cache\t:");
148 has_l2cache = 1;
149 if (of_get_property(np, "cache-unified", NULL) && dc) {
150 seq_printf(m, " %dK unified", *dc / 1024);
151 } else {
152 if (ic)
153 seq_printf(m, " %dK instruction", *ic / 1024);
154 if (dc)
155 seq_printf(m, "%s %dK data",
156 (ic? " +": ""), *dc / 1024);
157 }
158 pp = of_get_property(np, "ram-type", NULL);
159 if (pp)
160 seq_printf(m, " %s", pp);
161 seq_printf(m, "\n");
162 of_node_put(np);
163 }
164
165 /* Indicate newworld/oldworld */
166 seq_printf(m, "pmac-generation\t: %s\n",
167 pmac_newworld ? "NewWorld" : "OldWorld");
168 }
169
170 #ifndef CONFIG_ADB_CUDA
find_via_cuda(void)171 int find_via_cuda(void)
172 {
173 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
174
175 if (!dn)
176 return 0;
177 of_node_put(dn);
178 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
179 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
180 return 0;
181 }
182 #endif
183
184 #ifndef CONFIG_ADB_PMU
find_via_pmu(void)185 int find_via_pmu(void)
186 {
187 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
188
189 if (!dn)
190 return 0;
191 of_node_put(dn);
192 printk("WARNING ! Your machine is PMU-based but your kernel\n");
193 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
194 return 0;
195 }
196 #endif
197
198 #ifndef CONFIG_PMAC_SMU
smu_init(void)199 int smu_init(void)
200 {
201 /* should check and warn if SMU is present */
202 return 0;
203 }
204 #endif
205
206 #ifdef CONFIG_PPC32
207 static volatile u32 *sysctrl_regs;
208
ohare_init(void)209 static void __init ohare_init(void)
210 {
211 struct device_node *dn;
212
213 /* this area has the CPU identification register
214 and some registers used by smp boards */
215 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
216
217 /*
218 * Turn on the L2 cache.
219 * We assume that we have a PSX memory controller iff
220 * we have an ohare I/O controller.
221 */
222 dn = of_find_node_by_name(NULL, "ohare");
223 if (dn) {
224 of_node_put(dn);
225 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
226 if (sysctrl_regs[4] & 0x10)
227 sysctrl_regs[4] |= 0x04000020;
228 else
229 sysctrl_regs[4] |= 0x04000000;
230 if(has_l2cache)
231 printk(KERN_INFO "Level 2 cache enabled\n");
232 }
233 }
234 }
235
l2cr_init(void)236 static void __init l2cr_init(void)
237 {
238 /* Checks "l2cr-value" property in the registry */
239 if (cpu_has_feature(CPU_FTR_L2CR)) {
240 struct device_node *np;
241
242 for_each_of_cpu_node(np) {
243 const unsigned int *l2cr =
244 of_get_property(np, "l2cr-value", NULL);
245 if (l2cr) {
246 ppc_override_l2cr = 1;
247 ppc_override_l2cr_value = *l2cr;
248 _set_L2CR(0);
249 _set_L2CR(ppc_override_l2cr_value);
250 }
251 of_node_put(np);
252 break;
253 }
254 }
255
256 if (ppc_override_l2cr)
257 printk(KERN_INFO "L2CR overridden (0x%x), "
258 "backside cache is %s\n",
259 ppc_override_l2cr_value,
260 (ppc_override_l2cr_value & 0x80000000)
261 ? "enabled" : "disabled");
262 }
263 #endif
264
pmac_setup_arch(void)265 static void __init pmac_setup_arch(void)
266 {
267 struct device_node *cpu, *ic;
268 const int *fp;
269 unsigned long pvr;
270
271 pvr = PVR_VER(mfspr(SPRN_PVR));
272
273 /* Set loops_per_jiffy to a half-way reasonable value,
274 for use until calibrate_delay gets called. */
275 loops_per_jiffy = 50000000 / HZ;
276
277 for_each_of_cpu_node(cpu) {
278 fp = of_get_property(cpu, "clock-frequency", NULL);
279 if (fp != NULL) {
280 if (pvr >= 0x30 && pvr < 0x80)
281 /* PPC970 etc. */
282 loops_per_jiffy = *fp / (3 * HZ);
283 else if (pvr == 4 || pvr >= 8)
284 /* 604, G3, G4 etc. */
285 loops_per_jiffy = *fp / HZ;
286 else
287 /* 603, etc. */
288 loops_per_jiffy = *fp / (2 * HZ);
289 of_node_put(cpu);
290 break;
291 }
292 }
293
294 /* See if newworld or oldworld */
295 ic = of_find_node_with_property(NULL, "interrupt-controller");
296 if (ic) {
297 pmac_newworld = 1;
298 of_node_put(ic);
299 }
300
301 /* Lookup PCI hosts */
302 pmac_pci_init();
303
304 #ifdef CONFIG_PPC32
305 ohare_init();
306 l2cr_init();
307 #endif /* CONFIG_PPC32 */
308
309 find_via_cuda();
310 find_via_pmu();
311 smu_init();
312
313 #if IS_ENABLED(CONFIG_NVRAM)
314 pmac_nvram_init();
315 #endif
316 #ifdef CONFIG_PPC32
317 #ifdef CONFIG_BLK_DEV_INITRD
318 if (initrd_start)
319 ROOT_DEV = Root_RAM0;
320 else
321 #endif
322 ROOT_DEV = DEFAULT_ROOT_DEVICE;
323 #endif
324
325 #ifdef CONFIG_ADB
326 if (strstr(boot_command_line, "adb_sync")) {
327 extern int __adb_probe_sync;
328 __adb_probe_sync = 1;
329 }
330 #endif /* CONFIG_ADB */
331 }
332
333 #ifdef CONFIG_SCSI
note_scsi_host(struct device_node * node,void * host)334 void note_scsi_host(struct device_node *node, void *host)
335 {
336 }
337 EXPORT_SYMBOL(note_scsi_host);
338 #endif
339
340 static int initializing = 1;
341
pmac_late_init(void)342 static int pmac_late_init(void)
343 {
344 initializing = 0;
345 return 0;
346 }
347 machine_late_initcall(powermac, pmac_late_init);
348
349 void note_bootable_part(dev_t dev, int part, int goodness);
350 /*
351 * This is __ref because we check for "initializing" before
352 * touching any of the __init sensitive things and "initializing"
353 * will be false after __init time. This can't be __init because it
354 * can be called whenever a disk is first accessed.
355 */
note_bootable_part(dev_t dev,int part,int goodness)356 void __ref note_bootable_part(dev_t dev, int part, int goodness)
357 {
358 char *p;
359
360 if (!initializing)
361 return;
362 if ((goodness <= current_root_goodness) &&
363 ROOT_DEV != DEFAULT_ROOT_DEVICE)
364 return;
365 p = strstr(boot_command_line, "root=");
366 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
367 return;
368
369 ROOT_DEV = dev + part;
370 current_root_goodness = goodness;
371 }
372
373 #ifdef CONFIG_ADB_CUDA
cuda_restart(void)374 static void __noreturn cuda_restart(void)
375 {
376 struct adb_request req;
377
378 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
379 for (;;)
380 cuda_poll();
381 }
382
cuda_shutdown(void)383 static void __noreturn cuda_shutdown(void)
384 {
385 struct adb_request req;
386
387 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
388 for (;;)
389 cuda_poll();
390 }
391
392 #else
393 #define cuda_restart()
394 #define cuda_shutdown()
395 #endif
396
397 #ifndef CONFIG_ADB_PMU
398 #define pmu_restart()
399 #define pmu_shutdown()
400 #endif
401
402 #ifndef CONFIG_PMAC_SMU
403 #define smu_restart()
404 #define smu_shutdown()
405 #endif
406
pmac_restart(char * cmd)407 static void __noreturn pmac_restart(char *cmd)
408 {
409 switch (sys_ctrler) {
410 case SYS_CTRLER_CUDA:
411 cuda_restart();
412 break;
413 case SYS_CTRLER_PMU:
414 pmu_restart();
415 break;
416 case SYS_CTRLER_SMU:
417 smu_restart();
418 break;
419 default: ;
420 }
421 while (1) ;
422 }
423
pmac_power_off(void)424 static void __noreturn pmac_power_off(void)
425 {
426 switch (sys_ctrler) {
427 case SYS_CTRLER_CUDA:
428 cuda_shutdown();
429 break;
430 case SYS_CTRLER_PMU:
431 pmu_shutdown();
432 break;
433 case SYS_CTRLER_SMU:
434 smu_shutdown();
435 break;
436 default: ;
437 }
438 while (1) ;
439 }
440
441 static void __noreturn
pmac_halt(void)442 pmac_halt(void)
443 {
444 pmac_power_off();
445 }
446
447 /*
448 * Early initialization.
449 */
pmac_init(void)450 static void __init pmac_init(void)
451 {
452 /* Enable early btext debug if requested */
453 if (strstr(boot_command_line, "btextdbg")) {
454 udbg_adb_init_early();
455 register_early_udbg_console();
456 }
457
458 /* Probe motherboard chipset */
459 pmac_feature_init();
460
461 /* Initialize debug stuff */
462 udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
463 udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
464
465 #ifdef CONFIG_PPC64
466 iommu_init_early_dart(&pmac_pci_controller_ops);
467 #endif
468
469 /* SMP Init has to be done early as we need to patch up
470 * cpu_possible_mask before interrupt stacks are allocated
471 * or kaboom...
472 */
473 #ifdef CONFIG_SMP
474 pmac_setup_smp();
475 #endif
476 }
477
pmac_declare_of_platform_devices(void)478 static int __init pmac_declare_of_platform_devices(void)
479 {
480 struct device_node *np;
481
482 np = of_find_node_by_name(NULL, "valkyrie");
483 if (np) {
484 of_platform_device_create(np, "valkyrie", NULL);
485 of_node_put(np);
486 }
487 np = of_find_node_by_name(NULL, "platinum");
488 if (np) {
489 of_platform_device_create(np, "platinum", NULL);
490 of_node_put(np);
491 }
492 np = of_find_node_by_type(NULL, "smu");
493 if (np) {
494 of_platform_device_create(np, "smu", NULL);
495 of_node_put(np);
496 }
497 np = of_find_node_by_type(NULL, "fcu");
498 if (np == NULL) {
499 /* Some machines have strangely broken device-tree */
500 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
501 }
502 if (np) {
503 of_platform_device_create(np, "temperature", NULL);
504 of_node_put(np);
505 }
506
507 return 0;
508 }
509 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
510
511 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
512 /*
513 * This is called very early, as part of console_init() (typically just after
514 * time_init()). This function is respondible for trying to find a good
515 * default console on serial ports. It tries to match the open firmware
516 * default output with one of the available serial console drivers.
517 */
check_pmac_serial_console(void)518 static int __init check_pmac_serial_console(void)
519 {
520 struct device_node *prom_stdout = NULL;
521 int offset = 0;
522 const char *name;
523 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
524 char *devname = "ttyS";
525 #else
526 char *devname = "ttyPZ";
527 #endif
528
529 pr_debug(" -> check_pmac_serial_console()\n");
530
531 /* The user has requested a console so this is already set up. */
532 if (strstr(boot_command_line, "console=")) {
533 pr_debug(" console was specified !\n");
534 return -EBUSY;
535 }
536
537 if (!of_chosen) {
538 pr_debug(" of_chosen is NULL !\n");
539 return -ENODEV;
540 }
541
542 /* We are getting a weird phandle from OF ... */
543 /* ... So use the full path instead */
544 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
545 if (name == NULL) {
546 pr_debug(" no linux,stdout-path !\n");
547 return -ENODEV;
548 }
549 prom_stdout = of_find_node_by_path(name);
550 if (!prom_stdout) {
551 pr_debug(" can't find stdout package %s !\n", name);
552 return -ENODEV;
553 }
554 pr_debug("stdout is %pOF\n", prom_stdout);
555
556 if (of_node_name_eq(prom_stdout, "ch-a"))
557 offset = 0;
558 else if (of_node_name_eq(prom_stdout, "ch-b"))
559 offset = 1;
560 else
561 goto not_found;
562 of_node_put(prom_stdout);
563
564 pr_debug("Found serial console at %s%d\n", devname, offset);
565
566 return add_preferred_console(devname, offset, NULL);
567
568 not_found:
569 pr_debug("No preferred console found !\n");
570 of_node_put(prom_stdout);
571 return -ENODEV;
572 }
573 console_initcall(check_pmac_serial_console);
574
575 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
576
577 /*
578 * Called very early, MMU is off, device-tree isn't unflattened
579 */
pmac_probe(void)580 static int __init pmac_probe(void)
581 {
582 if (!of_machine_is_compatible("Power Macintosh") &&
583 !of_machine_is_compatible("MacRISC"))
584 return 0;
585
586 #ifdef CONFIG_PPC32
587 /* isa_io_base gets set in pmac_pci_init */
588 DMA_MODE_READ = 1;
589 DMA_MODE_WRITE = 2;
590 #endif /* CONFIG_PPC32 */
591
592 pm_power_off = pmac_power_off;
593
594 pmac_init();
595
596 return 1;
597 }
598
define_machine(powermac)599 define_machine(powermac) {
600 .name = "PowerMac",
601 .probe = pmac_probe,
602 .setup_arch = pmac_setup_arch,
603 .show_cpuinfo = pmac_show_cpuinfo,
604 .init_IRQ = pmac_pic_init,
605 .get_irq = NULL, /* changed later */
606 .pci_irq_fixup = pmac_pci_irq_fixup,
607 .restart = pmac_restart,
608 .halt = pmac_halt,
609 .time_init = pmac_time_init,
610 .get_boot_time = pmac_get_boot_time,
611 .set_rtc_time = pmac_set_rtc_time,
612 .get_rtc_time = pmac_get_rtc_time,
613 .calibrate_decr = pmac_calibrate_decr,
614 .feature_call = pmac_do_feature_call,
615 .progress = udbg_progress,
616 #ifdef CONFIG_PPC64
617 .power_save = power4_idle,
618 .enable_pmcs = power4_enable_pmcs,
619 #endif /* CONFIG_PPC64 */
620 #ifdef CONFIG_PPC32
621 .pcibios_after_init = pmac_pcibios_after_init,
622 .phys_mem_access_prot = pci_phys_mem_access_prot,
623 #endif
624 };
625
