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 #ifdef CONFIG_PPC32
302 ohare_init();
303 l2cr_init();
304 #endif /* CONFIG_PPC32 */
305
306 find_via_cuda();
307 find_via_pmu();
308 smu_init();
309
310 #if IS_ENABLED(CONFIG_NVRAM)
311 pmac_nvram_init();
312 #endif
313 #ifdef CONFIG_PPC32
314 #ifdef CONFIG_BLK_DEV_INITRD
315 if (initrd_start)
316 ROOT_DEV = Root_RAM0;
317 else
318 #endif
319 ROOT_DEV = DEFAULT_ROOT_DEVICE;
320 #endif
321
322 #ifdef CONFIG_ADB
323 if (strstr(boot_command_line, "adb_sync")) {
324 extern int __adb_probe_sync;
325 __adb_probe_sync = 1;
326 }
327 #endif /* CONFIG_ADB */
328 }
329
330 #ifdef CONFIG_SCSI
note_scsi_host(struct device_node * node,void * host)331 void note_scsi_host(struct device_node *node, void *host)
332 {
333 }
334 EXPORT_SYMBOL(note_scsi_host);
335 #endif
336
337 static int initializing = 1;
338
pmac_late_init(void)339 static int pmac_late_init(void)
340 {
341 initializing = 0;
342 return 0;
343 }
344 machine_late_initcall(powermac, pmac_late_init);
345
346 void note_bootable_part(dev_t dev, int part, int goodness);
347 /*
348 * This is __ref because we check for "initializing" before
349 * touching any of the __init sensitive things and "initializing"
350 * will be false after __init time. This can't be __init because it
351 * can be called whenever a disk is first accessed.
352 */
note_bootable_part(dev_t dev,int part,int goodness)353 void __ref note_bootable_part(dev_t dev, int part, int goodness)
354 {
355 char *p;
356
357 if (!initializing)
358 return;
359 if ((goodness <= current_root_goodness) &&
360 ROOT_DEV != DEFAULT_ROOT_DEVICE)
361 return;
362 p = strstr(boot_command_line, "root=");
363 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
364 return;
365
366 ROOT_DEV = dev + part;
367 current_root_goodness = goodness;
368 }
369
370 #ifdef CONFIG_ADB_CUDA
cuda_restart(void)371 static void __noreturn cuda_restart(void)
372 {
373 struct adb_request req;
374
375 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
376 for (;;)
377 cuda_poll();
378 }
379
cuda_shutdown(void)380 static void __noreturn cuda_shutdown(void)
381 {
382 struct adb_request req;
383
384 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
385 for (;;)
386 cuda_poll();
387 }
388
389 #else
390 #define cuda_restart()
391 #define cuda_shutdown()
392 #endif
393
394 #ifndef CONFIG_ADB_PMU
395 #define pmu_restart()
396 #define pmu_shutdown()
397 #endif
398
399 #ifndef CONFIG_PMAC_SMU
400 #define smu_restart()
401 #define smu_shutdown()
402 #endif
403
pmac_restart(char * cmd)404 static void __noreturn pmac_restart(char *cmd)
405 {
406 switch (sys_ctrler) {
407 case SYS_CTRLER_CUDA:
408 cuda_restart();
409 break;
410 case SYS_CTRLER_PMU:
411 pmu_restart();
412 break;
413 case SYS_CTRLER_SMU:
414 smu_restart();
415 break;
416 default: ;
417 }
418 while (1) ;
419 }
420
pmac_power_off(void)421 static void __noreturn pmac_power_off(void)
422 {
423 switch (sys_ctrler) {
424 case SYS_CTRLER_CUDA:
425 cuda_shutdown();
426 break;
427 case SYS_CTRLER_PMU:
428 pmu_shutdown();
429 break;
430 case SYS_CTRLER_SMU:
431 smu_shutdown();
432 break;
433 default: ;
434 }
435 while (1) ;
436 }
437
438 static void __noreturn
pmac_halt(void)439 pmac_halt(void)
440 {
441 pmac_power_off();
442 }
443
444 /*
445 * Early initialization.
446 */
pmac_init(void)447 static void __init pmac_init(void)
448 {
449 /* Enable early btext debug if requested */
450 if (strstr(boot_command_line, "btextdbg")) {
451 udbg_adb_init_early();
452 register_early_udbg_console();
453 }
454
455 /* Probe motherboard chipset */
456 pmac_feature_init();
457
458 /* Initialize debug stuff */
459 udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
460 udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
461
462 #ifdef CONFIG_PPC64
463 iommu_init_early_dart(&pmac_pci_controller_ops);
464 #endif
465
466 /* SMP Init has to be done early as we need to patch up
467 * cpu_possible_mask before interrupt stacks are allocated
468 * or kaboom...
469 */
470 #ifdef CONFIG_SMP
471 pmac_setup_smp();
472 #endif
473 }
474
pmac_declare_of_platform_devices(void)475 static int __init pmac_declare_of_platform_devices(void)
476 {
477 struct device_node *np;
478
479 np = of_find_node_by_name(NULL, "valkyrie");
480 if (np) {
481 of_platform_device_create(np, "valkyrie", NULL);
482 of_node_put(np);
483 }
484 np = of_find_node_by_name(NULL, "platinum");
485 if (np) {
486 of_platform_device_create(np, "platinum", NULL);
487 of_node_put(np);
488 }
489 np = of_find_node_by_type(NULL, "smu");
490 if (np) {
491 of_platform_device_create(np, "smu", NULL);
492 of_node_put(np);
493 }
494 np = of_find_node_by_type(NULL, "fcu");
495 if (np == NULL) {
496 /* Some machines have strangely broken device-tree */
497 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
498 }
499 if (np) {
500 of_platform_device_create(np, "temperature", NULL);
501 of_node_put(np);
502 }
503
504 return 0;
505 }
506 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
507
508 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
509 /*
510 * This is called very early, as part of console_init() (typically just after
511 * time_init()). This function is respondible for trying to find a good
512 * default console on serial ports. It tries to match the open firmware
513 * default output with one of the available serial console drivers.
514 */
check_pmac_serial_console(void)515 static int __init check_pmac_serial_console(void)
516 {
517 struct device_node *prom_stdout = NULL;
518 int offset = 0;
519 const char *name;
520 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
521 char *devname = "ttyS";
522 #else
523 char *devname = "ttyPZ";
524 #endif
525
526 pr_debug(" -> check_pmac_serial_console()\n");
527
528 /* The user has requested a console so this is already set up. */
529 if (strstr(boot_command_line, "console=")) {
530 pr_debug(" console was specified !\n");
531 return -EBUSY;
532 }
533
534 if (!of_chosen) {
535 pr_debug(" of_chosen is NULL !\n");
536 return -ENODEV;
537 }
538
539 /* We are getting a weird phandle from OF ... */
540 /* ... So use the full path instead */
541 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
542 if (name == NULL) {
543 pr_debug(" no linux,stdout-path !\n");
544 return -ENODEV;
545 }
546 prom_stdout = of_find_node_by_path(name);
547 if (!prom_stdout) {
548 pr_debug(" can't find stdout package %s !\n", name);
549 return -ENODEV;
550 }
551 pr_debug("stdout is %pOF\n", prom_stdout);
552
553 if (of_node_name_eq(prom_stdout, "ch-a"))
554 offset = 0;
555 else if (of_node_name_eq(prom_stdout, "ch-b"))
556 offset = 1;
557 else
558 goto not_found;
559 of_node_put(prom_stdout);
560
561 pr_debug("Found serial console at %s%d\n", devname, offset);
562
563 return add_preferred_console(devname, offset, NULL);
564
565 not_found:
566 pr_debug("No preferred console found !\n");
567 of_node_put(prom_stdout);
568 return -ENODEV;
569 }
570 console_initcall(check_pmac_serial_console);
571
572 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
573
574 /*
575 * Called very early, MMU is off, device-tree isn't unflattened
576 */
pmac_probe(void)577 static int __init pmac_probe(void)
578 {
579 if (!of_machine_is_compatible("Power Macintosh") &&
580 !of_machine_is_compatible("MacRISC"))
581 return 0;
582
583 #ifdef CONFIG_PPC32
584 /* isa_io_base gets set in pmac_pci_init */
585 DMA_MODE_READ = 1;
586 DMA_MODE_WRITE = 2;
587 #endif /* CONFIG_PPC32 */
588
589 pm_power_off = pmac_power_off;
590
591 pmac_init();
592
593 return 1;
594 }
595
define_machine(powermac)596 define_machine(powermac) {
597 .name = "PowerMac",
598 .probe = pmac_probe,
599 .setup_arch = pmac_setup_arch,
600 .discover_phbs = pmac_pci_init,
601 .show_cpuinfo = pmac_show_cpuinfo,
602 .init_IRQ = pmac_pic_init,
603 .get_irq = NULL, /* changed later */
604 .pci_irq_fixup = pmac_pci_irq_fixup,
605 .restart = pmac_restart,
606 .halt = pmac_halt,
607 .time_init = pmac_time_init,
608 .get_boot_time = pmac_get_boot_time,
609 .set_rtc_time = pmac_set_rtc_time,
610 .get_rtc_time = pmac_get_rtc_time,
611 .calibrate_decr = pmac_calibrate_decr,
612 .feature_call = pmac_do_feature_call,
613 .progress = udbg_progress,
614 #ifdef CONFIG_PPC64
615 .power_save = power4_idle,
616 .enable_pmcs = power4_enable_pmcs,
617 #endif /* CONFIG_PPC64 */
618 #ifdef CONFIG_PPC32
619 .pcibios_after_init = pmac_pcibios_after_init,
620 .phys_mem_access_prot = pci_phys_mem_access_prot,
621 #endif
622 };
623