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 static int has_l2cache;
74
75 int pmac_newworld;
76
77 static int current_root_goodness = -1;
78
79 #define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */
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_get_property(np, "cache-unified", NULL) && 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, ((*l2cr) & 0x80000000) ?
241 "enabled" : "disabled");
242 }
243 of_node_put(np);
244 break;
245 }
246 }
247 }
248 #endif
249
pmac_setup_arch(void)250 static void __init pmac_setup_arch(void)
251 {
252 struct device_node *cpu, *ic;
253 const int *fp;
254 unsigned long pvr;
255
256 pvr = PVR_VER(mfspr(SPRN_PVR));
257
258 /* Set loops_per_jiffy to a half-way reasonable value,
259 for use until calibrate_delay gets called. */
260 loops_per_jiffy = 50000000 / HZ;
261
262 for_each_of_cpu_node(cpu) {
263 fp = of_get_property(cpu, "clock-frequency", NULL);
264 if (fp != NULL) {
265 if (pvr >= 0x30 && pvr < 0x80)
266 /* PPC970 etc. */
267 loops_per_jiffy = *fp / (3 * HZ);
268 else if (pvr == 4 || pvr >= 8)
269 /* 604, G3, G4 etc. */
270 loops_per_jiffy = *fp / HZ;
271 else
272 /* 603, etc. */
273 loops_per_jiffy = *fp / (2 * HZ);
274 of_node_put(cpu);
275 break;
276 }
277 }
278
279 /* See if newworld or oldworld */
280 ic = of_find_node_with_property(NULL, "interrupt-controller");
281 if (ic) {
282 pmac_newworld = 1;
283 of_node_put(ic);
284 }
285
286 #ifdef CONFIG_PPC32
287 ohare_init();
288 l2cr_init();
289 #endif /* CONFIG_PPC32 */
290
291 find_via_cuda();
292 find_via_pmu();
293 smu_init();
294
295 #if IS_ENABLED(CONFIG_NVRAM)
296 pmac_nvram_init();
297 #endif
298 #ifdef CONFIG_PPC32
299 #ifdef CONFIG_BLK_DEV_INITRD
300 if (initrd_start)
301 ROOT_DEV = Root_RAM0;
302 else
303 #endif
304 ROOT_DEV = DEFAULT_ROOT_DEVICE;
305 #endif
306
307 #ifdef CONFIG_ADB
308 if (strstr(boot_command_line, "adb_sync")) {
309 extern int __adb_probe_sync;
310 __adb_probe_sync = 1;
311 }
312 #endif /* CONFIG_ADB */
313 }
314
315 static int initializing = 1;
316
pmac_late_init(void)317 static int pmac_late_init(void)
318 {
319 initializing = 0;
320 return 0;
321 }
322 machine_late_initcall(powermac, pmac_late_init);
323
324 void note_bootable_part(dev_t dev, int part, int goodness);
325 /*
326 * This is __ref because we check for "initializing" before
327 * touching any of the __init sensitive things and "initializing"
328 * will be false after __init time. This can't be __init because it
329 * can be called whenever a disk is first accessed.
330 */
note_bootable_part(dev_t dev,int part,int goodness)331 void __ref note_bootable_part(dev_t dev, int part, int goodness)
332 {
333 char *p;
334
335 if (!initializing)
336 return;
337 if ((goodness <= current_root_goodness) &&
338 ROOT_DEV != DEFAULT_ROOT_DEVICE)
339 return;
340 p = strstr(boot_command_line, "root=");
341 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
342 return;
343
344 ROOT_DEV = dev + part;
345 current_root_goodness = goodness;
346 }
347
348 #ifdef CONFIG_ADB_CUDA
cuda_restart(void)349 static void __noreturn cuda_restart(void)
350 {
351 struct adb_request req;
352
353 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
354 for (;;)
355 cuda_poll();
356 }
357
cuda_shutdown(void)358 static void __noreturn cuda_shutdown(void)
359 {
360 struct adb_request req;
361
362 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
363 for (;;)
364 cuda_poll();
365 }
366
367 #else
368 #define cuda_restart()
369 #define cuda_shutdown()
370 #endif
371
372 #ifndef CONFIG_ADB_PMU
373 #define pmu_restart()
374 #define pmu_shutdown()
375 #endif
376
377 #ifndef CONFIG_PMAC_SMU
378 #define smu_restart()
379 #define smu_shutdown()
380 #endif
381
pmac_restart(char * cmd)382 static void __noreturn pmac_restart(char *cmd)
383 {
384 switch (sys_ctrler) {
385 case SYS_CTRLER_CUDA:
386 cuda_restart();
387 break;
388 case SYS_CTRLER_PMU:
389 pmu_restart();
390 break;
391 case SYS_CTRLER_SMU:
392 smu_restart();
393 break;
394 default: ;
395 }
396 while (1) ;
397 }
398
pmac_power_off(void)399 static void __noreturn pmac_power_off(void)
400 {
401 switch (sys_ctrler) {
402 case SYS_CTRLER_CUDA:
403 cuda_shutdown();
404 break;
405 case SYS_CTRLER_PMU:
406 pmu_shutdown();
407 break;
408 case SYS_CTRLER_SMU:
409 smu_shutdown();
410 break;
411 default: ;
412 }
413 while (1) ;
414 }
415
416 static void __noreturn
pmac_halt(void)417 pmac_halt(void)
418 {
419 pmac_power_off();
420 }
421
422 /*
423 * Early initialization.
424 */
pmac_init(void)425 static void __init pmac_init(void)
426 {
427 /* Enable early btext debug if requested */
428 if (strstr(boot_command_line, "btextdbg")) {
429 udbg_adb_init_early();
430 register_early_udbg_console();
431 }
432
433 /* Probe motherboard chipset */
434 pmac_feature_init();
435
436 /* Initialize debug stuff */
437 udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
438 udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
439
440 #ifdef CONFIG_PPC64
441 iommu_init_early_dart(&pmac_pci_controller_ops);
442 #endif
443
444 /* SMP Init has to be done early as we need to patch up
445 * cpu_possible_mask before interrupt stacks are allocated
446 * or kaboom...
447 */
448 #ifdef CONFIG_SMP
449 pmac_setup_smp();
450 #endif
451 }
452
pmac_declare_of_platform_devices(void)453 static int __init pmac_declare_of_platform_devices(void)
454 {
455 struct device_node *np;
456
457 np = of_find_node_by_name(NULL, "valkyrie");
458 if (np) {
459 of_platform_device_create(np, "valkyrie", NULL);
460 of_node_put(np);
461 }
462 np = of_find_node_by_name(NULL, "platinum");
463 if (np) {
464 of_platform_device_create(np, "platinum", NULL);
465 of_node_put(np);
466 }
467 np = of_find_node_by_type(NULL, "smu");
468 if (np) {
469 of_platform_device_create(np, "smu", NULL);
470 of_node_put(np);
471 }
472 np = of_find_node_by_type(NULL, "fcu");
473 if (np == NULL) {
474 /* Some machines have strangely broken device-tree */
475 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
476 }
477 if (np) {
478 of_platform_device_create(np, "temperature", NULL);
479 of_node_put(np);
480 }
481
482 return 0;
483 }
484 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
485
486 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
487 /*
488 * This is called very early, as part of console_init() (typically just after
489 * time_init()). This function is respondible for trying to find a good
490 * default console on serial ports. It tries to match the open firmware
491 * default output with one of the available serial console drivers.
492 */
check_pmac_serial_console(void)493 static int __init check_pmac_serial_console(void)
494 {
495 struct device_node *prom_stdout = NULL;
496 int offset = 0;
497 const char *name;
498 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
499 char *devname = "ttyS";
500 #else
501 char *devname = "ttyPZ";
502 #endif
503
504 pr_debug(" -> check_pmac_serial_console()\n");
505
506 /* The user has requested a console so this is already set up. */
507 if (strstr(boot_command_line, "console=")) {
508 pr_debug(" console was specified !\n");
509 return -EBUSY;
510 }
511
512 if (!of_chosen) {
513 pr_debug(" of_chosen is NULL !\n");
514 return -ENODEV;
515 }
516
517 /* We are getting a weird phandle from OF ... */
518 /* ... So use the full path instead */
519 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
520 if (name == NULL) {
521 pr_debug(" no linux,stdout-path !\n");
522 return -ENODEV;
523 }
524 prom_stdout = of_find_node_by_path(name);
525 if (!prom_stdout) {
526 pr_debug(" can't find stdout package %s !\n", name);
527 return -ENODEV;
528 }
529 pr_debug("stdout is %pOF\n", prom_stdout);
530
531 if (of_node_name_eq(prom_stdout, "ch-a"))
532 offset = 0;
533 else if (of_node_name_eq(prom_stdout, "ch-b"))
534 offset = 1;
535 else
536 goto not_found;
537 of_node_put(prom_stdout);
538
539 pr_debug("Found serial console at %s%d\n", devname, offset);
540
541 return add_preferred_console(devname, offset, NULL);
542
543 not_found:
544 pr_debug("No preferred console found !\n");
545 of_node_put(prom_stdout);
546 return -ENODEV;
547 }
548 console_initcall(check_pmac_serial_console);
549
550 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
551
552 /*
553 * Called very early, MMU is off, device-tree isn't unflattened
554 */
pmac_probe(void)555 static int __init pmac_probe(void)
556 {
557 if (!of_machine_is_compatible("Power Macintosh") &&
558 !of_machine_is_compatible("MacRISC"))
559 return 0;
560
561 #ifdef CONFIG_PPC32
562 /* isa_io_base gets set in pmac_pci_init */
563 DMA_MODE_READ = 1;
564 DMA_MODE_WRITE = 2;
565 #endif /* CONFIG_PPC32 */
566
567 pm_power_off = pmac_power_off;
568
569 pmac_init();
570
571 return 1;
572 }
573
define_machine(powermac)574 define_machine(powermac) {
575 .name = "PowerMac",
576 .probe = pmac_probe,
577 .setup_arch = pmac_setup_arch,
578 .discover_phbs = pmac_pci_init,
579 .show_cpuinfo = pmac_show_cpuinfo,
580 .init_IRQ = pmac_pic_init,
581 .get_irq = NULL, /* changed later */
582 .pci_irq_fixup = pmac_pci_irq_fixup,
583 .restart = pmac_restart,
584 .halt = pmac_halt,
585 .time_init = pmac_time_init,
586 .get_boot_time = pmac_get_boot_time,
587 .set_rtc_time = pmac_set_rtc_time,
588 .get_rtc_time = pmac_get_rtc_time,
589 .calibrate_decr = pmac_calibrate_decr,
590 .feature_call = pmac_do_feature_call,
591 .progress = udbg_progress,
592 #ifdef CONFIG_PPC64
593 .power_save = power4_idle,
594 .enable_pmcs = power4_enable_pmcs,
595 #endif /* CONFIG_PPC64 */
596 #ifdef CONFIG_PPC32
597 .pcibios_after_init = pmac_pcibios_after_init,
598 .phys_mem_access_prot = pci_phys_mem_access_prot,
599 #endif
600 };
601