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