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/string.h>
32 #include <linux/delay.h>
33 #include <linux/ioport.h>
34 #include <linux/major.h>
35 #include <linux/initrd.h>
36 #include <linux/console.h>
37 #include <linux/pci.h>
38 #include <linux/adb.h>
39 #include <linux/cuda.h>
40 #include <linux/pmu.h>
41 #include <linux/irq.h>
42 #include <linux/seq_file.h>
43 #include <linux/root_dev.h>
44 #include <linux/bitops.h>
45 #include <linux/suspend.h>
46 #include <linux/string_choices.h>
47 #include <linux/of.h>
48 #include <linux/of_platform.h>
49
50 #include <asm/reg.h>
51 #include <asm/sections.h>
52 #include <asm/io.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/ohare.h>
55 #include <asm/mediabay.h>
56 #include <asm/machdep.h>
57 #include <asm/dma.h>
58 #include <asm/cputable.h>
59 #include <asm/btext.h>
60 #include <asm/pmac_feature.h>
61 #include <asm/time.h>
62 #include <asm/mmu_context.h>
63 #include <asm/iommu.h>
64 #include <asm/smu.h>
65 #include <asm/pmc.h>
66 #include <asm/udbg.h>
67
68 #include "pmac.h"
69
70 #undef SHOW_GATWICK_IRQS
71
72 static int has_l2cache;
73
74 int pmac_newworld;
75
76 static int current_root_goodness = -1;
77
78 /* sda1 - slightly silly choice */
79 #define DEFAULT_ROOT_DEVICE MKDEV(SCSI_DISK0_MAJOR, 1)
80
81 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
82 EXPORT_SYMBOL(sys_ctrler);
83
pmac_show_cpuinfo(struct seq_file * m)84 static void pmac_show_cpuinfo(struct seq_file *m)
85 {
86 struct device_node *np;
87 const char *pp;
88 int plen;
89 int mbmodel;
90 unsigned int mbflags;
91 char* mbname;
92
93 mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
94 PMAC_MB_INFO_MODEL, 0);
95 mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
96 PMAC_MB_INFO_FLAGS, 0);
97 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
98 (long) &mbname) != 0)
99 mbname = "Unknown";
100
101 /* find motherboard type */
102 seq_printf(m, "machine\t\t: ");
103 np = of_find_node_by_path("/");
104 if (np != NULL) {
105 pp = of_get_property(np, "model", NULL);
106 if (pp != NULL)
107 seq_printf(m, "%s\n", pp);
108 else
109 seq_printf(m, "PowerMac\n");
110 pp = of_get_property(np, "compatible", &plen);
111 if (pp != NULL) {
112 seq_printf(m, "motherboard\t:");
113 while (plen > 0) {
114 int l = strlen(pp) + 1;
115 seq_printf(m, " %s", pp);
116 plen -= l;
117 pp += l;
118 }
119 seq_printf(m, "\n");
120 }
121 of_node_put(np);
122 } else
123 seq_printf(m, "PowerMac\n");
124
125 /* print parsed model */
126 seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
127 seq_printf(m, "pmac flags\t: %08x\n", mbflags);
128
129 /* find l2 cache info */
130 np = of_find_node_by_name(NULL, "l2-cache");
131 if (np == NULL)
132 np = of_find_node_by_type(NULL, "cache");
133 if (np != NULL) {
134 const unsigned int *ic =
135 of_get_property(np, "i-cache-size", NULL);
136 const unsigned int *dc =
137 of_get_property(np, "d-cache-size", NULL);
138 seq_printf(m, "L2 cache\t:");
139 has_l2cache = 1;
140 if (of_property_read_bool(np, "cache-unified") && dc) {
141 seq_printf(m, " %dK unified", *dc / 1024);
142 } else {
143 if (ic)
144 seq_printf(m, " %dK instruction", *ic / 1024);
145 if (dc)
146 seq_printf(m, "%s %dK data",
147 (ic? " +": ""), *dc / 1024);
148 }
149 pp = of_get_property(np, "ram-type", NULL);
150 if (pp)
151 seq_printf(m, " %s", pp);
152 seq_printf(m, "\n");
153 of_node_put(np);
154 }
155
156 /* Indicate newworld/oldworld */
157 seq_printf(m, "pmac-generation\t: %s\n",
158 pmac_newworld ? "NewWorld" : "OldWorld");
159 }
160
161 #ifndef CONFIG_ADB_CUDA
find_via_cuda(void)162 int __init find_via_cuda(void)
163 {
164 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
165
166 if (!dn)
167 return 0;
168 of_node_put(dn);
169 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
170 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
171 return 0;
172 }
173 #endif
174
175 #ifndef CONFIG_ADB_PMU
find_via_pmu(void)176 int __init find_via_pmu(void)
177 {
178 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
179
180 if (!dn)
181 return 0;
182 of_node_put(dn);
183 printk("WARNING ! Your machine is PMU-based but your kernel\n");
184 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
185 return 0;
186 }
187 #endif
188
189 #ifndef CONFIG_PMAC_SMU
smu_init(void)190 int __init smu_init(void)
191 {
192 /* should check and warn if SMU is present */
193 return 0;
194 }
195 #endif
196
197 #ifdef CONFIG_PPC32
198 static volatile u32 *sysctrl_regs;
199
ohare_init(void)200 static void __init ohare_init(void)
201 {
202 struct device_node *dn;
203
204 /* this area has the CPU identification register
205 and some registers used by smp boards */
206 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
207
208 /*
209 * Turn on the L2 cache.
210 * We assume that we have a PSX memory controller iff
211 * we have an ohare I/O controller.
212 */
213 dn = of_find_node_by_name(NULL, "ohare");
214 if (dn) {
215 of_node_put(dn);
216 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
217 if (sysctrl_regs[4] & 0x10)
218 sysctrl_regs[4] |= 0x04000020;
219 else
220 sysctrl_regs[4] |= 0x04000000;
221 if(has_l2cache)
222 printk(KERN_INFO "Level 2 cache enabled\n");
223 }
224 }
225 }
226
l2cr_init(void)227 static void __init l2cr_init(void)
228 {
229 /* Checks "l2cr-value" property in the registry */
230 if (cpu_has_feature(CPU_FTR_L2CR)) {
231 struct device_node *np;
232
233 for_each_of_cpu_node(np) {
234 const unsigned int *l2cr =
235 of_get_property(np, "l2cr-value", NULL);
236 if (l2cr) {
237 _set_L2CR(0);
238 _set_L2CR(*l2cr);
239 pr_info("L2CR overridden (0x%x), backside cache is %s\n",
240 *l2cr, str_enabled_disabled((*l2cr) & 0x80000000));
241 }
242 of_node_put(np);
243 break;
244 }
245 }
246 }
247 #endif
248
pmac_setup_arch(void)249 static void __init pmac_setup_arch(void)
250 {
251 struct device_node *cpu, *ic;
252 const int *fp;
253 unsigned long pvr;
254
255 pvr = PVR_VER(mfspr(SPRN_PVR));
256
257 /* Set loops_per_jiffy to a half-way reasonable value,
258 for use until calibrate_delay gets called. */
259 loops_per_jiffy = 50000000 / HZ;
260
261 for_each_of_cpu_node(cpu) {
262 fp = of_get_property(cpu, "clock-frequency", NULL);
263 if (fp != NULL) {
264 if (pvr >= 0x30 && pvr < 0x80)
265 /* PPC970 etc. */
266 loops_per_jiffy = *fp / (3 * HZ);
267 else if (pvr == 4 || pvr >= 8)
268 /* 604, G3, G4 etc. */
269 loops_per_jiffy = *fp / HZ;
270 else
271 /* 603, etc. */
272 loops_per_jiffy = *fp / (2 * HZ);
273 of_node_put(cpu);
274 break;
275 }
276 }
277
278 /* See if newworld or oldworld */
279 ic = of_find_node_with_property(NULL, "interrupt-controller");
280 if (ic) {
281 pmac_newworld = 1;
282 of_node_put(ic);
283 }
284
285 #ifdef CONFIG_PPC32
286 ohare_init();
287 l2cr_init();
288 #endif /* CONFIG_PPC32 */
289
290 find_via_cuda();
291 find_via_pmu();
292 smu_init();
293
294 #if IS_ENABLED(CONFIG_NVRAM)
295 pmac_nvram_init();
296 #endif
297 #ifdef CONFIG_PPC32
298 #ifdef CONFIG_BLK_DEV_INITRD
299 if (initrd_start)
300 ROOT_DEV = Root_RAM0;
301 else
302 #endif
303 ROOT_DEV = DEFAULT_ROOT_DEVICE;
304 #endif
305
306 #ifdef CONFIG_ADB
307 if (strstr(boot_command_line, "adb_sync")) {
308 extern int __adb_probe_sync;
309 __adb_probe_sync = 1;
310 }
311 #endif /* CONFIG_ADB */
312 }
313
314 static int initializing = 1;
315
pmac_late_init(void)316 static int pmac_late_init(void)
317 {
318 initializing = 0;
319 return 0;
320 }
321 machine_late_initcall(powermac, pmac_late_init);
322
323 void note_bootable_part(dev_t dev, int part, int goodness);
324 /*
325 * This is __ref because we check for "initializing" before
326 * touching any of the __init sensitive things and "initializing"
327 * will be false after __init time. This can't be __init because it
328 * can be called whenever a disk is first accessed.
329 */
note_bootable_part(dev_t dev,int part,int goodness)330 void __ref note_bootable_part(dev_t dev, int part, int goodness)
331 {
332 char *p;
333
334 if (!initializing)
335 return;
336 if ((goodness <= current_root_goodness) &&
337 ROOT_DEV != DEFAULT_ROOT_DEVICE)
338 return;
339 p = strstr(boot_command_line, "root=");
340 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
341 return;
342
343 ROOT_DEV = dev + part;
344 current_root_goodness = goodness;
345 }
346
347 #ifdef CONFIG_ADB_CUDA
cuda_restart(void)348 static void __noreturn cuda_restart(void)
349 {
350 struct adb_request req;
351
352 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
353 for (;;)
354 cuda_poll();
355 }
356
cuda_shutdown(void)357 static void __noreturn cuda_shutdown(void)
358 {
359 struct adb_request req;
360
361 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
362 for (;;)
363 cuda_poll();
364 }
365
366 #else
367 #define cuda_restart()
368 #define cuda_shutdown()
369 #endif
370
371 #ifndef CONFIG_ADB_PMU
372 #define pmu_restart()
373 #define pmu_shutdown()
374 #endif
375
376 #ifndef CONFIG_PMAC_SMU
377 #define smu_restart()
378 #define smu_shutdown()
379 #endif
380
pmac_restart(char * cmd)381 static void __noreturn pmac_restart(char *cmd)
382 {
383 switch (sys_ctrler) {
384 case SYS_CTRLER_CUDA:
385 cuda_restart();
386 break;
387 case SYS_CTRLER_PMU:
388 pmu_restart();
389 break;
390 case SYS_CTRLER_SMU:
391 smu_restart();
392 break;
393 default: ;
394 }
395 while (1) ;
396 }
397
pmac_power_off(void)398 static void __noreturn pmac_power_off(void)
399 {
400 switch (sys_ctrler) {
401 case SYS_CTRLER_CUDA:
402 cuda_shutdown();
403 break;
404 case SYS_CTRLER_PMU:
405 pmu_shutdown();
406 break;
407 case SYS_CTRLER_SMU:
408 smu_shutdown();
409 break;
410 default: ;
411 }
412 while (1) ;
413 }
414
415 static void __noreturn
pmac_halt(void)416 pmac_halt(void)
417 {
418 pmac_power_off();
419 }
420
421 /*
422 * Early initialization.
423 */
pmac_init(void)424 static void __init pmac_init(void)
425 {
426 /* Enable early btext debug if requested */
427 if (strstr(boot_command_line, "btextdbg")) {
428 udbg_adb_init_early();
429 register_early_udbg_console();
430 }
431
432 /* Probe motherboard chipset */
433 pmac_feature_init();
434
435 /* Initialize debug stuff */
436 udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
437 udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
438
439 #ifdef CONFIG_PPC64
440 iommu_init_early_dart(&pmac_pci_controller_ops);
441 #endif
442
443 /* SMP Init has to be done early as we need to patch up
444 * cpu_possible_mask before interrupt stacks are allocated
445 * or kaboom...
446 */
447 #ifdef CONFIG_SMP
448 pmac_setup_smp();
449 #endif
450 }
451
pmac_declare_of_platform_devices(void)452 static int __init pmac_declare_of_platform_devices(void)
453 {
454 struct device_node *np;
455
456 np = of_find_node_by_name(NULL, "valkyrie");
457 if (np) {
458 of_platform_device_create(np, "valkyrie", NULL);
459 of_node_put(np);
460 }
461 np = of_find_node_by_name(NULL, "platinum");
462 if (np) {
463 of_platform_device_create(np, "platinum", NULL);
464 of_node_put(np);
465 }
466 np = of_find_node_by_type(NULL, "smu");
467 if (np) {
468 of_platform_device_create(np, "smu", NULL);
469 of_node_put(np);
470 }
471 np = of_find_node_by_type(NULL, "fcu");
472 if (np == NULL) {
473 /* Some machines have strangely broken device-tree */
474 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
475 }
476 if (np) {
477 of_platform_device_create(np, "temperature", NULL);
478 of_node_put(np);
479 }
480
481 return 0;
482 }
483 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
484
485 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
486 /*
487 * This is called very early, as part of console_init() (typically just after
488 * time_init()). This function is respondible for trying to find a good
489 * default console on serial ports. It tries to match the open firmware
490 * default output with one of the available serial console drivers.
491 */
check_pmac_serial_console(void)492 static int __init check_pmac_serial_console(void)
493 {
494 struct device_node *prom_stdout = NULL;
495 int offset = 0;
496 const char *name;
497 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
498 char *devname = "ttyS";
499 #else
500 char *devname = "ttyPZ";
501 #endif
502
503 pr_debug(" -> check_pmac_serial_console()\n");
504
505 /* The user has requested a console so this is already set up. */
506 if (strstr(boot_command_line, "console=")) {
507 pr_debug(" console was specified !\n");
508 return -EBUSY;
509 }
510
511 if (!of_chosen) {
512 pr_debug(" of_chosen is NULL !\n");
513 return -ENODEV;
514 }
515
516 /* We are getting a weird phandle from OF ... */
517 /* ... So use the full path instead */
518 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
519 if (name == NULL) {
520 pr_debug(" no linux,stdout-path !\n");
521 return -ENODEV;
522 }
523 prom_stdout = of_find_node_by_path(name);
524 if (!prom_stdout) {
525 pr_debug(" can't find stdout package %s !\n", name);
526 return -ENODEV;
527 }
528 pr_debug("stdout is %pOF\n", prom_stdout);
529
530 if (of_node_name_eq(prom_stdout, "ch-a"))
531 offset = 0;
532 else if (of_node_name_eq(prom_stdout, "ch-b"))
533 offset = 1;
534 else
535 goto not_found;
536 of_node_put(prom_stdout);
537
538 pr_debug("Found serial console at %s%d\n", devname, offset);
539
540 return add_preferred_console(devname, offset, NULL);
541
542 not_found:
543 pr_debug("No preferred console found !\n");
544 of_node_put(prom_stdout);
545 return -ENODEV;
546 }
547 console_initcall(check_pmac_serial_console);
548
549 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
550
551 /*
552 * Called very early, MMU is off, device-tree isn't unflattened
553 */
pmac_probe(void)554 static int __init pmac_probe(void)
555 {
556 if (!of_machine_is_compatible("Power Macintosh") &&
557 !of_machine_is_compatible("MacRISC"))
558 return 0;
559
560 #ifdef CONFIG_PPC32
561 /* isa_io_base gets set in pmac_pci_init */
562 DMA_MODE_READ = 1;
563 DMA_MODE_WRITE = 2;
564 #endif /* CONFIG_PPC32 */
565
566 pm_power_off = pmac_power_off;
567
568 pmac_init();
569
570 return 1;
571 }
572
define_machine(powermac)573 define_machine(powermac) {
574 .name = "PowerMac",
575 .probe = pmac_probe,
576 .setup_arch = pmac_setup_arch,
577 .discover_phbs = pmac_pci_init,
578 .show_cpuinfo = pmac_show_cpuinfo,
579 .init_IRQ = pmac_pic_init,
580 .get_irq = NULL, /* changed later */
581 .pci_irq_fixup = pmac_pci_irq_fixup,
582 .restart = pmac_restart,
583 .halt = pmac_halt,
584 .time_init = pmac_time_init,
585 .get_boot_time = pmac_get_boot_time,
586 .set_rtc_time = pmac_set_rtc_time,
587 .get_rtc_time = pmac_get_rtc_time,
588 .calibrate_decr = pmac_calibrate_decr,
589 .feature_call = pmac_do_feature_call,
590 .progress = udbg_progress,
591 #ifdef CONFIG_PPC64
592 .power_save = power4_idle,
593 .enable_pmcs = power4_enable_pmcs,
594 #endif /* CONFIG_PPC64 */
595 #ifdef CONFIG_PPC32
596 .pcibios_after_init = pmac_pcibios_after_init,
597 .phys_mem_access_prot = pci_phys_mem_access_prot,
598 #endif
599 };
600