1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Powermac setup and early boot code plus other random bits.
6 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
8 * Adapted for Power Macintosh by Paul Mackerras
9 * Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
11 * Derived from "arch/alpha/kernel/setup.c"
12 * Copyright (C) 1995 Linus Torvalds
14 * Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
18 * bootup setup stuff..
21 #include <linux/init.h>
22 #include <linux/errno.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.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>
52 #include <asm/sections.h>
54 #include <asm/pgtable.h>
56 #include <asm/pci-bridge.h>
57 #include <asm/ohare.h>
58 #include <asm/mediabay.h>
59 #include <asm/machdep.h>
61 #include <asm/cputable.h>
62 #include <asm/btext.h>
63 #include <asm/pmac_feature.h>
65 #include <asm/mmu_context.h>
66 #include <asm/iommu.h>
73 #undef SHOW_GATWICK_IRQS
75 int ppc_override_l2cr = 0;
76 int ppc_override_l2cr_value;
81 static int current_root_goodness = -1;
83 extern struct machdep_calls pmac_md;
85 #define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */
91 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
92 EXPORT_SYMBOL(sys_ctrler);
94 static void pmac_show_cpuinfo(struct seq_file *m)
96 struct device_node *np;
100 unsigned int mbflags;
103 mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
104 PMAC_MB_INFO_MODEL, 0);
105 mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
106 PMAC_MB_INFO_FLAGS, 0);
107 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
108 (long) &mbname) != 0)
111 /* find motherboard type */
112 seq_printf(m, "machine\t\t: ");
113 np = of_find_node_by_path("/");
115 pp = of_get_property(np, "model", NULL);
117 seq_printf(m, "%s\n", pp);
119 seq_printf(m, "PowerMac\n");
120 pp = of_get_property(np, "compatible", &plen);
122 seq_printf(m, "motherboard\t:");
124 int l = strlen(pp) + 1;
125 seq_printf(m, " %s", pp);
133 seq_printf(m, "PowerMac\n");
135 /* print parsed model */
136 seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
137 seq_printf(m, "pmac flags\t: %08x\n", mbflags);
139 /* find l2 cache info */
140 np = of_find_node_by_name(NULL, "l2-cache");
142 np = of_find_node_by_type(NULL, "cache");
144 const unsigned int *ic =
145 of_get_property(np, "i-cache-size", NULL);
146 const unsigned int *dc =
147 of_get_property(np, "d-cache-size", NULL);
148 seq_printf(m, "L2 cache\t:");
150 if (of_get_property(np, "cache-unified", NULL) && dc) {
151 seq_printf(m, " %dK unified", *dc / 1024);
154 seq_printf(m, " %dK instruction", *ic / 1024);
156 seq_printf(m, "%s %dK data",
157 (ic? " +": ""), *dc / 1024);
159 pp = of_get_property(np, "ram-type", NULL);
161 seq_printf(m, " %s", pp);
166 /* Indicate newworld/oldworld */
167 seq_printf(m, "pmac-generation\t: %s\n",
168 pmac_newworld ? "NewWorld" : "OldWorld");
171 #ifndef CONFIG_ADB_CUDA
172 int find_via_cuda(void)
174 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
179 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
180 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
185 #ifndef CONFIG_ADB_PMU
186 int find_via_pmu(void)
188 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
193 printk("WARNING ! Your machine is PMU-based but your kernel\n");
194 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
199 #ifndef CONFIG_PMAC_SMU
202 /* should check and warn if SMU is present */
208 static volatile u32 *sysctrl_regs;
210 static void __init ohare_init(void)
212 struct device_node *dn;
214 /* this area has the CPU identification register
215 and some registers used by smp boards */
216 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
219 * Turn on the L2 cache.
220 * We assume that we have a PSX memory controller iff
221 * we have an ohare I/O controller.
223 dn = of_find_node_by_name(NULL, "ohare");
226 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
227 if (sysctrl_regs[4] & 0x10)
228 sysctrl_regs[4] |= 0x04000020;
230 sysctrl_regs[4] |= 0x04000000;
232 printk(KERN_INFO "Level 2 cache enabled\n");
237 static void __init l2cr_init(void)
239 /* Checks "l2cr-value" property in the registry */
240 if (cpu_has_feature(CPU_FTR_L2CR)) {
241 struct device_node *np;
243 for_each_of_cpu_node(np) {
244 const unsigned int *l2cr =
245 of_get_property(np, "l2cr-value", NULL);
247 ppc_override_l2cr = 1;
248 ppc_override_l2cr_value = *l2cr;
250 _set_L2CR(ppc_override_l2cr_value);
257 if (ppc_override_l2cr)
258 printk(KERN_INFO "L2CR overridden (0x%x), "
259 "backside cache is %s\n",
260 ppc_override_l2cr_value,
261 (ppc_override_l2cr_value & 0x80000000)
262 ? "enabled" : "disabled");
266 static void __init pmac_setup_arch(void)
268 struct device_node *cpu, *ic;
272 pvr = PVR_VER(mfspr(SPRN_PVR));
274 /* Set loops_per_jiffy to a half-way reasonable value,
275 for use until calibrate_delay gets called. */
276 loops_per_jiffy = 50000000 / HZ;
278 for_each_of_cpu_node(cpu) {
279 fp = of_get_property(cpu, "clock-frequency", NULL);
281 if (pvr >= 0x30 && pvr < 0x80)
283 loops_per_jiffy = *fp / (3 * HZ);
284 else if (pvr == 4 || pvr >= 8)
285 /* 604, G3, G4 etc. */
286 loops_per_jiffy = *fp / HZ;
289 loops_per_jiffy = *fp / (2 * HZ);
295 /* See if newworld or oldworld */
296 ic = of_find_node_with_property(NULL, "interrupt-controller");
302 /* Lookup PCI hosts */
308 #endif /* CONFIG_PPC32 */
314 #if IS_ENABLED(CONFIG_NVRAM)
318 #ifdef CONFIG_BLK_DEV_INITRD
320 ROOT_DEV = Root_RAM0;
323 ROOT_DEV = DEFAULT_ROOT_DEVICE;
327 if (strstr(boot_command_line, "adb_sync")) {
328 extern int __adb_probe_sync;
329 __adb_probe_sync = 1;
331 #endif /* CONFIG_ADB */
335 void note_scsi_host(struct device_node *node, void *host)
338 EXPORT_SYMBOL(note_scsi_host);
341 static int initializing = 1;
343 static int pmac_late_init(void)
348 machine_late_initcall(powermac, pmac_late_init);
350 void note_bootable_part(dev_t dev, int part, int goodness);
352 * This is __ref because we check for "initializing" before
353 * touching any of the __init sensitive things and "initializing"
354 * will be false after __init time. This can't be __init because it
355 * can be called whenever a disk is first accessed.
357 void __ref note_bootable_part(dev_t dev, int part, int goodness)
363 if ((goodness <= current_root_goodness) &&
364 ROOT_DEV != DEFAULT_ROOT_DEVICE)
366 p = strstr(boot_command_line, "root=");
367 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
370 ROOT_DEV = dev + part;
371 current_root_goodness = goodness;
374 #ifdef CONFIG_ADB_CUDA
375 static void __noreturn cuda_restart(void)
377 struct adb_request req;
379 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
384 static void __noreturn cuda_shutdown(void)
386 struct adb_request req;
388 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
394 #define cuda_restart()
395 #define cuda_shutdown()
398 #ifndef CONFIG_ADB_PMU
399 #define pmu_restart()
400 #define pmu_shutdown()
403 #ifndef CONFIG_PMAC_SMU
404 #define smu_restart()
405 #define smu_shutdown()
408 static void __noreturn pmac_restart(char *cmd)
410 switch (sys_ctrler) {
411 case SYS_CTRLER_CUDA:
425 static void __noreturn pmac_power_off(void)
427 switch (sys_ctrler) {
428 case SYS_CTRLER_CUDA:
442 static void __noreturn
449 * Early initialization.
451 static void __init pmac_init(void)
453 /* Enable early btext debug if requested */
454 if (strstr(boot_command_line, "btextdbg")) {
455 udbg_adb_init_early();
456 register_early_udbg_console();
459 /* Probe motherboard chipset */
462 /* Initialize debug stuff */
463 udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
464 udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
467 iommu_init_early_dart(&pmac_pci_controller_ops);
470 /* SMP Init has to be done early as we need to patch up
471 * cpu_possible_mask before interrupt stacks are allocated
479 static int __init pmac_declare_of_platform_devices(void)
481 struct device_node *np;
483 np = of_find_node_by_name(NULL, "valkyrie");
485 of_platform_device_create(np, "valkyrie", NULL);
488 np = of_find_node_by_name(NULL, "platinum");
490 of_platform_device_create(np, "platinum", NULL);
493 np = of_find_node_by_type(NULL, "smu");
495 of_platform_device_create(np, "smu", NULL);
498 np = of_find_node_by_type(NULL, "fcu");
500 /* Some machines have strangely broken device-tree */
501 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
504 of_platform_device_create(np, "temperature", NULL);
510 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
512 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
514 * This is called very early, as part of console_init() (typically just after
515 * time_init()). This function is respondible for trying to find a good
516 * default console on serial ports. It tries to match the open firmware
517 * default output with one of the available serial console drivers.
519 static int __init check_pmac_serial_console(void)
521 struct device_node *prom_stdout = NULL;
524 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
525 char *devname = "ttyS";
527 char *devname = "ttyPZ";
530 pr_debug(" -> check_pmac_serial_console()\n");
532 /* The user has requested a console so this is already set up. */
533 if (strstr(boot_command_line, "console=")) {
534 pr_debug(" console was specified !\n");
539 pr_debug(" of_chosen is NULL !\n");
543 /* We are getting a weird phandle from OF ... */
544 /* ... So use the full path instead */
545 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
547 pr_debug(" no linux,stdout-path !\n");
550 prom_stdout = of_find_node_by_path(name);
552 pr_debug(" can't find stdout package %s !\n", name);
555 pr_debug("stdout is %pOF\n", prom_stdout);
557 if (of_node_name_eq(prom_stdout, "ch-a"))
559 else if (of_node_name_eq(prom_stdout, "ch-b"))
563 of_node_put(prom_stdout);
565 pr_debug("Found serial console at %s%d\n", devname, offset);
567 return add_preferred_console(devname, offset, NULL);
570 pr_debug("No preferred console found !\n");
571 of_node_put(prom_stdout);
574 console_initcall(check_pmac_serial_console);
576 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
579 * Called very early, MMU is off, device-tree isn't unflattened
581 static int __init pmac_probe(void)
583 if (!of_machine_is_compatible("Power Macintosh") &&
584 !of_machine_is_compatible("MacRISC"))
588 /* isa_io_base gets set in pmac_pci_init */
589 ISA_DMA_THRESHOLD = ~0L;
592 #endif /* CONFIG_PPC32 */
594 pm_power_off = pmac_power_off;
601 define_machine(powermac) {
604 .setup_arch = pmac_setup_arch,
605 .show_cpuinfo = pmac_show_cpuinfo,
606 .init_IRQ = pmac_pic_init,
607 .get_irq = NULL, /* changed later */
608 .pci_irq_fixup = pmac_pci_irq_fixup,
609 .restart = pmac_restart,
611 .time_init = pmac_time_init,
612 .get_boot_time = pmac_get_boot_time,
613 .set_rtc_time = pmac_set_rtc_time,
614 .get_rtc_time = pmac_get_rtc_time,
615 .calibrate_decr = pmac_calibrate_decr,
616 .feature_call = pmac_do_feature_call,
617 .progress = udbg_progress,
619 .power_save = power4_idle,
620 .enable_pmcs = power4_enable_pmcs,
621 #endif /* CONFIG_PPC64 */
623 .pcibios_after_init = pmac_pcibios_after_init,
624 .phys_mem_access_prot = pci_phys_mem_access_prot,