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.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 static int has_l2cache;
74
75 int pmac_newworld;
76
77 static int current_root_goodness = -1;
78
79 /* sda1 - slightly silly choice */
80 #define DEFAULT_ROOT_DEVICE MKDEV(SCSI_DISK0_MAJOR, 1)
81
82 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
83 EXPORT_SYMBOL(sys_ctrler);
84
pmac_show_cpuinfo(struct seq_file * m)85 static void pmac_show_cpuinfo(struct seq_file *m)
86 {
87 struct device_node *np;
88 const char *pp;
89 int plen;
90 int mbmodel;
91 unsigned int mbflags;
92 char* mbname;
93
94 mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
95 PMAC_MB_INFO_MODEL, 0);
96 mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
97 PMAC_MB_INFO_FLAGS, 0);
98 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
99 (long) &mbname) != 0)
100 mbname = "Unknown";
101
102 /* find motherboard type */
103 seq_printf(m, "machine\t\t: ");
104 np = of_find_node_by_path("/");
105 if (np != NULL) {
106 pp = of_get_property(np, "model", NULL);
107 if (pp != NULL)
108 seq_printf(m, "%s\n", pp);
109 else
110 seq_printf(m, "PowerMac\n");
111 pp = of_get_property(np, "compatible", &plen);
112 if (pp != NULL) {
113 seq_printf(m, "motherboard\t:");
114 while (plen > 0) {
115 int l = strlen(pp) + 1;
116 seq_printf(m, " %s", pp);
117 plen -= l;
118 pp += l;
119 }
120 seq_printf(m, "\n");
121 }
122 of_node_put(np);
123 } else
124 seq_printf(m, "PowerMac\n");
125
126 /* print parsed model */
127 seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
128 seq_printf(m, "pmac flags\t: %08x\n", mbflags);
129
130 /* find l2 cache info */
131 np = of_find_node_by_name(NULL, "l2-cache");
132 if (np == NULL)
133 np = of_find_node_by_type(NULL, "cache");
134 if (np != NULL) {
135 const unsigned int *ic =
136 of_get_property(np, "i-cache-size", NULL);
137 const unsigned int *dc =
138 of_get_property(np, "d-cache-size", NULL);
139 seq_printf(m, "L2 cache\t:");
140 has_l2cache = 1;
141 if (of_property_read_bool(np, "cache-unified") && dc) {
142 seq_printf(m, " %dK unified", *dc / 1024);
143 } else {
144 if (ic)
145 seq_printf(m, " %dK instruction", *ic / 1024);
146 if (dc)
147 seq_printf(m, "%s %dK data",
148 (ic? " +": ""), *dc / 1024);
149 }
150 pp = of_get_property(np, "ram-type", NULL);
151 if (pp)
152 seq_printf(m, " %s", pp);
153 seq_printf(m, "\n");
154 of_node_put(np);
155 }
156
157 /* Indicate newworld/oldworld */
158 seq_printf(m, "pmac-generation\t: %s\n",
159 pmac_newworld ? "NewWorld" : "OldWorld");
160 }
161
162 #ifndef CONFIG_ADB_CUDA
find_via_cuda(void)163 int __init find_via_cuda(void)
164 {
165 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
166
167 if (!dn)
168 return 0;
169 of_node_put(dn);
170 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
171 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
172 return 0;
173 }
174 #endif
175
176 #ifndef CONFIG_ADB_PMU
find_via_pmu(void)177 int __init find_via_pmu(void)
178 {
179 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
180
181 if (!dn)
182 return 0;
183 of_node_put(dn);
184 printk("WARNING ! Your machine is PMU-based but your kernel\n");
185 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
186 return 0;
187 }
188 #endif
189
190 #ifndef CONFIG_PMAC_SMU
smu_init(void)191 int __init smu_init(void)
192 {
193 /* should check and warn if SMU is present */
194 return 0;
195 }
196 #endif
197
198 #ifdef CONFIG_PPC32
199 static volatile u32 *sysctrl_regs;
200
ohare_init(void)201 static void __init ohare_init(void)
202 {
203 struct device_node *dn;
204
205 /* this area has the CPU identification register
206 and some registers used by smp boards */
207 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
208
209 /*
210 * Turn on the L2 cache.
211 * We assume that we have a PSX memory controller iff
212 * we have an ohare I/O controller.
213 */
214 dn = of_find_node_by_name(NULL, "ohare");
215 if (dn) {
216 of_node_put(dn);
217 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
218 if (sysctrl_regs[4] & 0x10)
219 sysctrl_regs[4] |= 0x04000020;
220 else
221 sysctrl_regs[4] |= 0x04000000;
222 if(has_l2cache)
223 printk(KERN_INFO "Level 2 cache enabled\n");
224 }
225 }
226 }
227
l2cr_init(void)228 static void __init l2cr_init(void)
229 {
230 /* Checks "l2cr-value" property in the registry */
231 if (cpu_has_feature(CPU_FTR_L2CR)) {
232 struct device_node *np;
233
234 for_each_of_cpu_node(np) {
235 const unsigned int *l2cr =
236 of_get_property(np, "l2cr-value", NULL);
237 if (l2cr) {
238 _set_L2CR(0);
239 _set_L2CR(*l2cr);
240 pr_info("L2CR overridden (0x%x), backside cache is %s\n",
241 *l2cr, ((*l2cr) & 0x80000000) ?
242 "enabled" : "disabled");
243 }
244 of_node_put(np);
245 break;
246 }
247 }
248 }
249 #endif
250
pmac_setup_arch(void)251 static void __init pmac_setup_arch(void)
252 {
253 struct device_node *cpu, *ic;
254 const int *fp;
255 unsigned long pvr;
256
257 pvr = PVR_VER(mfspr(SPRN_PVR));
258
259 /* Set loops_per_jiffy to a half-way reasonable value,
260 for use until calibrate_delay gets called. */
261 loops_per_jiffy = 50000000 / HZ;
262
263 for_each_of_cpu_node(cpu) {
264 fp = of_get_property(cpu, "clock-frequency", NULL);
265 if (fp != NULL) {
266 if (pvr >= 0x30 && pvr < 0x80)
267 /* PPC970 etc. */
268 loops_per_jiffy = *fp / (3 * HZ);
269 else if (pvr == 4 || pvr >= 8)
270 /* 604, G3, G4 etc. */
271 loops_per_jiffy = *fp / HZ;
272 else
273 /* 603, etc. */
274 loops_per_jiffy = *fp / (2 * HZ);
275 of_node_put(cpu);
276 break;
277 }
278 }
279
280 /* See if newworld or oldworld */
281 ic = of_find_node_with_property(NULL, "interrupt-controller");
282 if (ic) {
283 pmac_newworld = 1;
284 of_node_put(ic);
285 }
286
287 #ifdef CONFIG_PPC32
288 ohare_init();
289 l2cr_init();
290 #endif /* CONFIG_PPC32 */
291
292 find_via_cuda();
293 find_via_pmu();
294 smu_init();
295
296 #if IS_ENABLED(CONFIG_NVRAM)
297 pmac_nvram_init();
298 #endif
299 #ifdef CONFIG_PPC32
300 #ifdef CONFIG_BLK_DEV_INITRD
301 if (initrd_start)
302 ROOT_DEV = Root_RAM0;
303 else
304 #endif
305 ROOT_DEV = DEFAULT_ROOT_DEVICE;
306 #endif
307
308 #ifdef CONFIG_ADB
309 if (strstr(boot_command_line, "adb_sync")) {
310 extern int __adb_probe_sync;
311 __adb_probe_sync = 1;
312 }
313 #endif /* CONFIG_ADB */
314 }
315
316 static int initializing = 1;
317
pmac_late_init(void)318 static int pmac_late_init(void)
319 {
320 initializing = 0;
321 return 0;
322 }
323 machine_late_initcall(powermac, pmac_late_init);
324
325 void note_bootable_part(dev_t dev, int part, int goodness);
326 /*
327 * This is __ref because we check for "initializing" before
328 * touching any of the __init sensitive things and "initializing"
329 * will be false after __init time. This can't be __init because it
330 * can be called whenever a disk is first accessed.
331 */
note_bootable_part(dev_t dev,int part,int goodness)332 void __ref note_bootable_part(dev_t dev, int part, int goodness)
333 {
334 char *p;
335
336 if (!initializing)
337 return;
338 if ((goodness <= current_root_goodness) &&
339 ROOT_DEV != DEFAULT_ROOT_DEVICE)
340 return;
341 p = strstr(boot_command_line, "root=");
342 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
343 return;
344
345 ROOT_DEV = dev + part;
346 current_root_goodness = goodness;
347 }
348
349 #ifdef CONFIG_ADB_CUDA
cuda_restart(void)350 static void __noreturn cuda_restart(void)
351 {
352 struct adb_request req;
353
354 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
355 for (;;)
356 cuda_poll();
357 }
358
cuda_shutdown(void)359 static void __noreturn cuda_shutdown(void)
360 {
361 struct adb_request req;
362
363 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
364 for (;;)
365 cuda_poll();
366 }
367
368 #else
369 #define cuda_restart()
370 #define cuda_shutdown()
371 #endif
372
373 #ifndef CONFIG_ADB_PMU
374 #define pmu_restart()
375 #define pmu_shutdown()
376 #endif
377
378 #ifndef CONFIG_PMAC_SMU
379 #define smu_restart()
380 #define smu_shutdown()
381 #endif
382
pmac_restart(char * cmd)383 static void __noreturn pmac_restart(char *cmd)
384 {
385 switch (sys_ctrler) {
386 case SYS_CTRLER_CUDA:
387 cuda_restart();
388 break;
389 case SYS_CTRLER_PMU:
390 pmu_restart();
391 break;
392 case SYS_CTRLER_SMU:
393 smu_restart();
394 break;
395 default: ;
396 }
397 while (1) ;
398 }
399
pmac_power_off(void)400 static void __noreturn pmac_power_off(void)
401 {
402 switch (sys_ctrler) {
403 case SYS_CTRLER_CUDA:
404 cuda_shutdown();
405 break;
406 case SYS_CTRLER_PMU:
407 pmu_shutdown();
408 break;
409 case SYS_CTRLER_SMU:
410 smu_shutdown();
411 break;
412 default: ;
413 }
414 while (1) ;
415 }
416
417 static void __noreturn
pmac_halt(void)418 pmac_halt(void)
419 {
420 pmac_power_off();
421 }
422
423 /*
424 * Early initialization.
425 */
pmac_init(void)426 static void __init pmac_init(void)
427 {
428 /* Enable early btext debug if requested */
429 if (strstr(boot_command_line, "btextdbg")) {
430 udbg_adb_init_early();
431 register_early_udbg_console();
432 }
433
434 /* Probe motherboard chipset */
435 pmac_feature_init();
436
437 /* Initialize debug stuff */
438 udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
439 udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
440
441 #ifdef CONFIG_PPC64
442 iommu_init_early_dart(&pmac_pci_controller_ops);
443 #endif
444
445 /* SMP Init has to be done early as we need to patch up
446 * cpu_possible_mask before interrupt stacks are allocated
447 * or kaboom...
448 */
449 #ifdef CONFIG_SMP
450 pmac_setup_smp();
451 #endif
452 }
453
pmac_declare_of_platform_devices(void)454 static int __init pmac_declare_of_platform_devices(void)
455 {
456 struct device_node *np;
457
458 np = of_find_node_by_name(NULL, "valkyrie");
459 if (np) {
460 of_platform_device_create(np, "valkyrie", NULL);
461 of_node_put(np);
462 }
463 np = of_find_node_by_name(NULL, "platinum");
464 if (np) {
465 of_platform_device_create(np, "platinum", NULL);
466 of_node_put(np);
467 }
468 np = of_find_node_by_type(NULL, "smu");
469 if (np) {
470 of_platform_device_create(np, "smu", NULL);
471 of_node_put(np);
472 }
473 np = of_find_node_by_type(NULL, "fcu");
474 if (np == NULL) {
475 /* Some machines have strangely broken device-tree */
476 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
477 }
478 if (np) {
479 of_platform_device_create(np, "temperature", NULL);
480 of_node_put(np);
481 }
482
483 return 0;
484 }
485 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
486
487 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
488 /*
489 * This is called very early, as part of console_init() (typically just after
490 * time_init()). This function is respondible for trying to find a good
491 * default console on serial ports. It tries to match the open firmware
492 * default output with one of the available serial console drivers.
493 */
check_pmac_serial_console(void)494 static int __init check_pmac_serial_console(void)
495 {
496 struct device_node *prom_stdout = NULL;
497 int offset = 0;
498 const char *name;
499 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
500 char *devname = "ttyS";
501 #else
502 char *devname = "ttyPZ";
503 #endif
504
505 pr_debug(" -> check_pmac_serial_console()\n");
506
507 /* The user has requested a console so this is already set up. */
508 if (strstr(boot_command_line, "console=")) {
509 pr_debug(" console was specified !\n");
510 return -EBUSY;
511 }
512
513 if (!of_chosen) {
514 pr_debug(" of_chosen is NULL !\n");
515 return -ENODEV;
516 }
517
518 /* We are getting a weird phandle from OF ... */
519 /* ... So use the full path instead */
520 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
521 if (name == NULL) {
522 pr_debug(" no linux,stdout-path !\n");
523 return -ENODEV;
524 }
525 prom_stdout = of_find_node_by_path(name);
526 if (!prom_stdout) {
527 pr_debug(" can't find stdout package %s !\n", name);
528 return -ENODEV;
529 }
530 pr_debug("stdout is %pOF\n", prom_stdout);
531
532 if (of_node_name_eq(prom_stdout, "ch-a"))
533 offset = 0;
534 else if (of_node_name_eq(prom_stdout, "ch-b"))
535 offset = 1;
536 else
537 goto not_found;
538 of_node_put(prom_stdout);
539
540 pr_debug("Found serial console at %s%d\n", devname, offset);
541
542 return add_preferred_console(devname, offset, NULL);
543
544 not_found:
545 pr_debug("No preferred console found !\n");
546 of_node_put(prom_stdout);
547 return -ENODEV;
548 }
549 console_initcall(check_pmac_serial_console);
550
551 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
552
553 /*
554 * Called very early, MMU is off, device-tree isn't unflattened
555 */
pmac_probe(void)556 static int __init pmac_probe(void)
557 {
558 if (!of_machine_is_compatible("Power Macintosh") &&
559 !of_machine_is_compatible("MacRISC"))
560 return 0;
561
562 #ifdef CONFIG_PPC32
563 /* isa_io_base gets set in pmac_pci_init */
564 DMA_MODE_READ = 1;
565 DMA_MODE_WRITE = 2;
566 #endif /* CONFIG_PPC32 */
567
568 pm_power_off = pmac_power_off;
569
570 pmac_init();
571
572 return 1;
573 }
574
define_machine(powermac)575 define_machine(powermac) {
576 .name = "PowerMac",
577 .probe = pmac_probe,
578 .setup_arch = pmac_setup_arch,
579 .discover_phbs = pmac_pci_init,
580 .show_cpuinfo = pmac_show_cpuinfo,
581 .init_IRQ = pmac_pic_init,
582 .get_irq = NULL, /* changed later */
583 .pci_irq_fixup = pmac_pci_irq_fixup,
584 .restart = pmac_restart,
585 .halt = pmac_halt,
586 .time_init = pmac_time_init,
587 .get_boot_time = pmac_get_boot_time,
588 .set_rtc_time = pmac_set_rtc_time,
589 .get_rtc_time = pmac_get_rtc_time,
590 .calibrate_decr = pmac_calibrate_decr,
591 .feature_call = pmac_do_feature_call,
592 .progress = udbg_progress,
593 #ifdef CONFIG_PPC64
594 .power_save = power4_idle,
595 .enable_pmcs = power4_enable_pmcs,
596 #endif /* CONFIG_PPC64 */
597 #ifdef CONFIG_PPC32
598 .pcibios_after_init = pmac_pcibios_after_init,
599 .phys_mem_access_prot = pci_phys_mem_access_prot,
600 #endif
601 };
602