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