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>
49 #include <linux/of_platform.h>
52 #include <asm/sections.h>
54 #include <asm/pci-bridge.h>
55 #include <asm/ohare.h>
56 #include <asm/mediabay.h>
57 #include <asm/machdep.h>
59 #include <asm/cputable.h>
60 #include <asm/btext.h>
61 #include <asm/pmac_feature.h>
63 #include <asm/mmu_context.h>
64 #include <asm/iommu.h>
71 #undef SHOW_GATWICK_IRQS
73 static int has_l2cache;
77 static int current_root_goodness = -1;
79 /* sda1 - slightly silly choice */
80 #define DEFAULT_ROOT_DEVICE MKDEV(SCSI_DISK0_MAJOR, 1)
82 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
83 EXPORT_SYMBOL(sys_ctrler);
85 static void pmac_show_cpuinfo(struct seq_file *m)
87 struct device_node *np;
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,
102 /* find motherboard type */
103 seq_printf(m, "machine\t\t: ");
104 np = of_find_node_by_path("/");
106 pp = of_get_property(np, "model", NULL);
108 seq_printf(m, "%s\n", pp);
110 seq_printf(m, "PowerMac\n");
111 pp = of_get_property(np, "compatible", &plen);
113 seq_printf(m, "motherboard\t:");
115 int l = strlen(pp) + 1;
116 seq_printf(m, " %s", pp);
124 seq_printf(m, "PowerMac\n");
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);
130 /* find l2 cache info */
131 np = of_find_node_by_name(NULL, "l2-cache");
133 np = of_find_node_by_type(NULL, "cache");
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:");
141 if (of_property_read_bool(np, "cache-unified") && dc) {
142 seq_printf(m, " %dK unified", *dc / 1024);
145 seq_printf(m, " %dK instruction", *ic / 1024);
147 seq_printf(m, "%s %dK data",
148 (ic? " +": ""), *dc / 1024);
150 pp = of_get_property(np, "ram-type", NULL);
152 seq_printf(m, " %s", pp);
157 /* Indicate newworld/oldworld */
158 seq_printf(m, "pmac-generation\t: %s\n",
159 pmac_newworld ? "NewWorld" : "OldWorld");
162 #ifndef CONFIG_ADB_CUDA
163 int __init find_via_cuda(void)
165 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
170 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
171 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
176 #ifndef CONFIG_ADB_PMU
177 int __init find_via_pmu(void)
179 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
184 printk("WARNING ! Your machine is PMU-based but your kernel\n");
185 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
190 #ifndef CONFIG_PMAC_SMU
191 int __init smu_init(void)
193 /* should check and warn if SMU is present */
199 static volatile u32 *sysctrl_regs;
201 static void __init ohare_init(void)
203 struct device_node *dn;
205 /* this area has the CPU identification register
206 and some registers used by smp boards */
207 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
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.
214 dn = of_find_node_by_name(NULL, "ohare");
217 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
218 if (sysctrl_regs[4] & 0x10)
219 sysctrl_regs[4] |= 0x04000020;
221 sysctrl_regs[4] |= 0x04000000;
223 printk(KERN_INFO "Level 2 cache enabled\n");
228 static void __init l2cr_init(void)
230 /* Checks "l2cr-value" property in the registry */
231 if (cpu_has_feature(CPU_FTR_L2CR)) {
232 struct device_node *np;
234 for_each_of_cpu_node(np) {
235 const unsigned int *l2cr =
236 of_get_property(np, "l2cr-value", NULL);
240 pr_info("L2CR overridden (0x%x), backside cache is %s\n",
241 *l2cr, ((*l2cr) & 0x80000000) ?
242 "enabled" : "disabled");
251 static void __init pmac_setup_arch(void)
253 struct device_node *cpu, *ic;
257 pvr = PVR_VER(mfspr(SPRN_PVR));
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;
263 for_each_of_cpu_node(cpu) {
264 fp = of_get_property(cpu, "clock-frequency", NULL);
266 if (pvr >= 0x30 && pvr < 0x80)
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;
274 loops_per_jiffy = *fp / (2 * HZ);
280 /* See if newworld or oldworld */
281 ic = of_find_node_with_property(NULL, "interrupt-controller");
290 #endif /* CONFIG_PPC32 */
296 #if IS_ENABLED(CONFIG_NVRAM)
300 #ifdef CONFIG_BLK_DEV_INITRD
302 ROOT_DEV = Root_RAM0;
305 ROOT_DEV = DEFAULT_ROOT_DEVICE;
309 if (strstr(boot_command_line, "adb_sync")) {
310 extern int __adb_probe_sync;
311 __adb_probe_sync = 1;
313 #endif /* CONFIG_ADB */
316 static int initializing = 1;
318 static int pmac_late_init(void)
323 machine_late_initcall(powermac, pmac_late_init);
325 void note_bootable_part(dev_t dev, int part, int goodness);
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.
332 void __ref note_bootable_part(dev_t dev, int part, int goodness)
338 if ((goodness <= current_root_goodness) &&
339 ROOT_DEV != DEFAULT_ROOT_DEVICE)
341 p = strstr(boot_command_line, "root=");
342 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
345 ROOT_DEV = dev + part;
346 current_root_goodness = goodness;
349 #ifdef CONFIG_ADB_CUDA
350 static void __noreturn cuda_restart(void)
352 struct adb_request req;
354 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
359 static void __noreturn cuda_shutdown(void)
361 struct adb_request req;
363 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
369 #define cuda_restart()
370 #define cuda_shutdown()
373 #ifndef CONFIG_ADB_PMU
374 #define pmu_restart()
375 #define pmu_shutdown()
378 #ifndef CONFIG_PMAC_SMU
379 #define smu_restart()
380 #define smu_shutdown()
383 static void __noreturn pmac_restart(char *cmd)
385 switch (sys_ctrler) {
386 case SYS_CTRLER_CUDA:
400 static void __noreturn pmac_power_off(void)
402 switch (sys_ctrler) {
403 case SYS_CTRLER_CUDA:
417 static void __noreturn
424 * Early initialization.
426 static void __init pmac_init(void)
428 /* Enable early btext debug if requested */
429 if (strstr(boot_command_line, "btextdbg")) {
430 udbg_adb_init_early();
431 register_early_udbg_console();
434 /* Probe motherboard chipset */
437 /* Initialize debug stuff */
438 udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
439 udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
442 iommu_init_early_dart(&pmac_pci_controller_ops);
445 /* SMP Init has to be done early as we need to patch up
446 * cpu_possible_mask before interrupt stacks are allocated
454 static int __init pmac_declare_of_platform_devices(void)
456 struct device_node *np;
458 np = of_find_node_by_name(NULL, "valkyrie");
460 of_platform_device_create(np, "valkyrie", NULL);
463 np = of_find_node_by_name(NULL, "platinum");
465 of_platform_device_create(np, "platinum", NULL);
468 np = of_find_node_by_type(NULL, "smu");
470 of_platform_device_create(np, "smu", NULL);
473 np = of_find_node_by_type(NULL, "fcu");
475 /* Some machines have strangely broken device-tree */
476 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
479 of_platform_device_create(np, "temperature", NULL);
485 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
487 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
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.
494 static int __init check_pmac_serial_console(void)
496 struct device_node *prom_stdout = NULL;
499 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
500 char *devname = "ttyS";
502 char *devname = "ttyPZ";
505 pr_debug(" -> check_pmac_serial_console()\n");
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");
514 pr_debug(" of_chosen is NULL !\n");
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);
522 pr_debug(" no linux,stdout-path !\n");
525 prom_stdout = of_find_node_by_path(name);
527 pr_debug(" can't find stdout package %s !\n", name);
530 pr_debug("stdout is %pOF\n", prom_stdout);
532 if (of_node_name_eq(prom_stdout, "ch-a"))
534 else if (of_node_name_eq(prom_stdout, "ch-b"))
538 of_node_put(prom_stdout);
540 pr_debug("Found serial console at %s%d\n", devname, offset);
542 return add_preferred_console(devname, offset, NULL);
545 pr_debug("No preferred console found !\n");
546 of_node_put(prom_stdout);
549 console_initcall(check_pmac_serial_console);
551 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
554 * Called very early, MMU is off, device-tree isn't unflattened
556 static int __init pmac_probe(void)
558 if (!of_machine_is_compatible("Power Macintosh") &&
559 !of_machine_is_compatible("MacRISC"))
563 /* isa_io_base gets set in pmac_pci_init */
566 #endif /* CONFIG_PPC32 */
568 pm_power_off = pmac_power_off;
575 define_machine(powermac) {
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,
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,
594 .power_save = power4_idle,
595 .enable_pmcs = power4_enable_pmcs,
596 #endif /* CONFIG_PPC64 */
598 .pcibios_after_init = pmac_pcibios_after_init,
599 .phys_mem_access_prot = pci_phys_mem_access_prot,