text: /*
   *  Powermac setup and early boot code plus other random bits.
   *
   *  PowerPC version
   *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   *
   *  Adapted for Power Macintosh by Paul Mackerras
   *    Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
   *
   *  Derived from "arch/alpha/kernel/setup.c"
   *    Copyright (C) 1995 Linus Torvalds
   *
   *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
   *
   *  This program is free software; you can redistribute it and/or
   *  modify it under the terms of the GNU General Public License
   *  as published by the Free Software Foundation; either version
   *  2 of the License, or (at your option) any later version.
   *
   */
  
  /*
   * bootup setup stuff..
   */
  
  #include <linux/init.h>
  #include <linux/errno.h>
  #include <linux/sched.h>
  #include <linux/kernel.h>
  #include <linux/mm.h>
  #include <linux/stddef.h>
  #include <linux/unistd.h>
  #include <linux/ptrace.h>
  #include <linux/export.h>
  #include <linux/user.h>
  #include <linux/tty.h>
  #include <linux/string.h>
  #include <linux/delay.h>
  #include <linux/ioport.h>
  #include <linux/major.h>
  #include <linux/initrd.h>
  #include <linux/vt_kern.h>
  #include <linux/console.h>
  #include <linux/pci.h>
  #include <linux/adb.h>
  #include <linux/cuda.h>
  #include <linux/pmu.h>
  #include <linux/irq.h>
  #include <linux/seq_file.h>
  #include <linux/root_dev.h>
  #include <linux/bitops.h>
  #include <linux/suspend.h>
  #include <linux/of_device.h>
  #include <linux/of_platform.h>
  
  #include <asm/reg.h>
  #include <asm/sections.h>
  #include <asm/prom.h>
  #include <asm/pgtable.h>
  #include <asm/io.h>
  #include <asm/pci-bridge.h>
  #include <asm/ohare.h>
  #include <asm/mediabay.h>
  #include <asm/machdep.h>
  #include <asm/dma.h>
  #include <asm/cputable.h>
  #include <asm/btext.h>
  #include <asm/pmac_feature.h>
  #include <asm/time.h>
  #include <asm/mmu_context.h>
  #include <asm/iommu.h>
  #include <asm/smu.h>
  #include <asm/pmc.h>
  #include <asm/udbg.h>
  
  #include "pmac.h"
  
  #undef SHOW_GATWICK_IRQS
  
  int ppc_override_l2cr = 0;
  int ppc_override_l2cr_value;
  int has_l2cache = 0;
  
  int pmac_newworld;
  
  static int current_root_goodness = -1;
  
  extern struct machdep_calls pmac_md;
  
  #define DEFAULT_ROOT_DEVICE Root_SDA1	/* sda1 - slightly silly choice */
  
  #ifdef CONFIG_PPC64
  int sccdbg;
  #endif
  
  sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
  EXPORT_SYMBOL(sys_ctrler);
  
  static void pmac_show_cpuinfo(struct seq_file *m)
  {
  	struct device_node *np;
  	const char *pp;
  	int plen;
  	int mbmodel;
  	unsigned int mbflags;
  	char* mbname;
  
  	mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
  				    PMAC_MB_INFO_MODEL, 0);
  	mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
  				    PMAC_MB_INFO_FLAGS, 0);
  	if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
  			      (long) &mbname) != 0)
  		mbname = "Unknown";
  
  	/* find motherboard type */
  	seq_printf(m, "machine\t\t: ");
  	np = of_find_node_by_path("/");
  	if (np != NULL) {
  		pp = of_get_property(np, "model", NULL);
  		if (pp != NULL)
  			seq_printf(m, "%s\n", pp);
  		else
  			seq_printf(m, "PowerMac\n");
  		pp = of_get_property(np, "compatible", &plen);
  		if (pp != NULL) {
  			seq_printf(m, "motherboard\t:");
  			while (plen > 0) {
  				int l = strlen(pp) + 1;
  				seq_printf(m, " %s", pp);
  				plen -= l;
  				pp += l;
  			}
  			seq_printf(m, "\n");
  		}
  		of_node_put(np);
  	} else
  		seq_printf(m, "PowerMac\n");
  
  	/* print parsed model */
  	seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
  	seq_printf(m, "pmac flags\t: %08x\n", mbflags);
  
  	/* find l2 cache info */
  	np = of_find_node_by_name(NULL, "l2-cache");
  	if (np == NULL)
  		np = of_find_node_by_type(NULL, "cache");
  	if (np != NULL) {
  		const unsigned int *ic =
  			of_get_property(np, "i-cache-size", NULL);
  		const unsigned int *dc =
  			of_get_property(np, "d-cache-size", NULL);
  		seq_printf(m, "L2 cache\t:");
  		has_l2cache = 1;
  		if (of_get_property(np, "cache-unified", NULL) && dc) {
  			seq_printf(m, " %dK unified", *dc / 1024);
  		} else {
  			if (ic)
  				seq_printf(m, " %dK instruction", *ic / 1024);
  			if (dc)
  				seq_printf(m, "%s %dK data",
  					   (ic? " +": ""), *dc / 1024);
  		}
  		pp = of_get_property(np, "ram-type", NULL);
  		if (pp)
  			seq_printf(m, " %s", pp);
  		seq_printf(m, "\n");
  		of_node_put(np);
  	}
  
  	/* Indicate newworld/oldworld */
  	seq_printf(m, "pmac-generation\t: %s\n",
  		   pmac_newworld ? "NewWorld" : "OldWorld");
  }
  
  #ifndef CONFIG_ADB_CUDA
  int find_via_cuda(void)
  {
  	struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
  
  	if (!dn)
  		return 0;
  	of_node_put(dn);
  	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
  	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
  	return 0;
  }
  #endif
  
  #ifndef CONFIG_ADB_PMU
  int find_via_pmu(void)
  {
  	struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
  
  	if (!dn)
  		return 0;
  	of_node_put(dn);
  	printk("WARNING ! Your machine is PMU-based but your kernel\n");
  	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
  	return 0;
  }
  #endif
  
  #ifndef CONFIG_PMAC_SMU
  int smu_init(void)
  {
  	/* should check and warn if SMU is present */
  	return 0;
  }
  #endif
  
  #ifdef CONFIG_PPC32
  static volatile u32 *sysctrl_regs;
  
  static void __init ohare_init(void)
  {
  	struct device_node *dn;
  
  	/* this area has the CPU identification register
  	   and some registers used by smp boards */
  	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
  
  	/*
  	 * Turn on the L2 cache.
  	 * We assume that we have a PSX memory controller iff
  	 * we have an ohare I/O controller.
  	 */
  	dn = of_find_node_by_name(NULL, "ohare");
  	if (dn) {
  		of_node_put(dn);
  		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
  			if (sysctrl_regs[4] & 0x10)
  				sysctrl_regs[4] |= 0x04000020;
  			else
  				sysctrl_regs[4] |= 0x04000000;
  			if(has_l2cache)
  				printk(KERN_INFO "Level 2 cache enabled\n");
  		}
  	}
  }
  
  static void __init l2cr_init(void)
  {
  	/* Checks "l2cr-value" property in the registry */
  	if (cpu_has_feature(CPU_FTR_L2CR)) {
  		struct device_node *np;
  
  		for_each_of_cpu_node(np) {
  			const unsigned int *l2cr =
  				of_get_property(np, "l2cr-value", NULL);
  			if (l2cr) {
  				ppc_override_l2cr = 1;
  				ppc_override_l2cr_value = *l2cr;
  				_set_L2CR(0);
  				_set_L2CR(ppc_override_l2cr_value);
  			}
  			of_node_put(np);
  			break;
  		}
  	}
  
  	if (ppc_override_l2cr)
  		printk(KERN_INFO "L2CR overridden (0x%x), "
  		       "backside cache is %s\n",
  		       ppc_override_l2cr_value,
  		       (ppc_override_l2cr_value & 0x80000000)
  				? "enabled" : "disabled");
  }
  #endif
  
  static void __init pmac_setup_arch(void)
  {
  	struct device_node *cpu, *ic;
  	const int *fp;
  	unsigned long pvr;
  
  	pvr = PVR_VER(mfspr(SPRN_PVR));
  
  	/* Set loops_per_jiffy to a half-way reasonable value,
  	   for use until calibrate_delay gets called. */
  	loops_per_jiffy = 50000000 / HZ;
  
  	for_each_of_cpu_node(cpu) {
  		fp = of_get_property(cpu, "clock-frequency", NULL);
  		if (fp != NULL) {
  			if (pvr >= 0x30 && pvr < 0x80)
  				/* PPC970 etc. */
  				loops_per_jiffy = *fp / (3 * HZ);
  			else if (pvr == 4 || pvr >= 8)
  				/* 604, G3, G4 etc. */
  				loops_per_jiffy = *fp / HZ;
  			else
  				/* 601, 603, etc. */
  				loops_per_jiffy = *fp / (2 * HZ);
  			of_node_put(cpu);
  			break;
  		}
  	}
  
  	/* See if newworld or oldworld */
  	ic = of_find_node_with_property(NULL, "interrupt-controller");
  	if (ic) {
  		pmac_newworld = 1;
  		of_node_put(ic);
  	}
  
  	/* Lookup PCI hosts */
  	pmac_pci_init();
  
  #ifdef CONFIG_PPC32
  	ohare_init();
  	l2cr_init();
  #endif /* CONFIG_PPC32 */
  
  	find_via_cuda();
  	find_via_pmu();
  	smu_init();
  
  #if IS_ENABLED(CONFIG_NVRAM)
  	pmac_nvram_init();
  #endif
  #ifdef CONFIG_PPC32
  #ifdef CONFIG_BLK_DEV_INITRD
  	if (initrd_start)
  		ROOT_DEV = Root_RAM0;
  	else
  #endif
  		ROOT_DEV = DEFAULT_ROOT_DEVICE;
  #endif
  
  #ifdef CONFIG_ADB
  	if (strstr(boot_command_line, "adb_sync")) {
  		extern int __adb_probe_sync;
  		__adb_probe_sync = 1;
  	}
  #endif /* CONFIG_ADB */
  }
  
  #ifdef CONFIG_SCSI
  void note_scsi_host(struct device_node *node, void *host)
  {
  }
  EXPORT_SYMBOL(note_scsi_host);
  #endif
  
  static int initializing = 1;
  
  static int pmac_late_init(void)
  {
  	initializing = 0;
  	return 0;
  }
  machine_late_initcall(powermac, pmac_late_init);
  
  void note_bootable_part(dev_t dev, int part, int goodness);
  /*
   * This is __ref because we check for "initializing" before
   * touching any of the __init sensitive things and "initializing"
   * will be false after __init time. This can't be __init because it
   * can be called whenever a disk is first accessed.
   */
  void __ref note_bootable_part(dev_t dev, int part, int goodness)
  {
  	char *p;
  
  	if (!initializing)
  		return;
  	if ((goodness <= current_root_goodness) &&
  	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
  		return;
  	p = strstr(boot_command_line, "root=");
  	if (p != NULL && (p == boot_command_line || p[-1] == ' '))
  		return;
  
  	ROOT_DEV = dev + part;
  	current_root_goodness = goodness;
  }
  
  #ifdef CONFIG_ADB_CUDA
  static void __noreturn cuda_restart(void)
  {
  	struct adb_request req;
  
  	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
  	for (;;)
  		cuda_poll();
  }
  
  static void __noreturn cuda_shutdown(void)
  {
  	struct adb_request req;
  
  	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
  	for (;;)
  		cuda_poll();
  }
  
  #else
  #define cuda_restart()
  #define cuda_shutdown()
  #endif
  
  #ifndef CONFIG_ADB_PMU
  #define pmu_restart()
  #define pmu_shutdown()
  #endif
  
  #ifndef CONFIG_PMAC_SMU
  #define smu_restart()
  #define smu_shutdown()
  #endif
  
  static void __noreturn pmac_restart(char *cmd)
  {
  	switch (sys_ctrler) {
  	case SYS_CTRLER_CUDA:
  		cuda_restart();
  		break;
  	case SYS_CTRLER_PMU:
  		pmu_restart();
  		break;
  	case SYS_CTRLER_SMU:
  		smu_restart();
  		break;
  	default: ;
  	}
  	while (1) ;
  }
  
  static void __noreturn pmac_power_off(void)
  {
  	switch (sys_ctrler) {
  	case SYS_CTRLER_CUDA:
  		cuda_shutdown();
  		break;
  	case SYS_CTRLER_PMU:
  		pmu_shutdown();
  		break;
  	case SYS_CTRLER_SMU:
  		smu_shutdown();
  		break;
  	default: ;
  	}
  	while (1) ;
  }
  
  static void __noreturn
  pmac_halt(void)
  {
  	pmac_power_off();
  }
  
  /* 
   * Early initialization.
   */
  static void __init pmac_init(void)
  {
  	/* Enable early btext debug if requested */
  	if (strstr(boot_command_line, "btextdbg")) {
  		udbg_adb_init_early();
  		register_early_udbg_console();
  	}
  
  	/* Probe motherboard chipset */
  	pmac_feature_init();
  
  	/* Initialize debug stuff */
  	udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
  	udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
  
  #ifdef CONFIG_PPC64
  	iommu_init_early_dart(&pmac_pci_controller_ops);
  #endif
  
  	/* SMP Init has to be done early as we need to patch up
  	 * cpu_possible_mask before interrupt stacks are allocated
  	 * or kaboom...
  	 */
  #ifdef CONFIG_SMP
  	pmac_setup_smp();
  #endif
  }
  
  static int __init pmac_declare_of_platform_devices(void)
  {
  	struct device_node *np;
  
  	np = of_find_node_by_name(NULL, "valkyrie");
  	if (np) {
  		of_platform_device_create(np, "valkyrie", NULL);
  		of_node_put(np);
  	}
  	np = of_find_node_by_name(NULL, "platinum");
  	if (np) {
  		of_platform_device_create(np, "platinum", NULL);
  		of_node_put(np);
  	}
          np = of_find_node_by_type(NULL, "smu");
          if (np) {
  		of_platform_device_create(np, "smu", NULL);
  		of_node_put(np);
  	}
  	np = of_find_node_by_type(NULL, "fcu");
  	if (np == NULL) {
  		/* Some machines have strangely broken device-tree */
  		np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
  	}
  	if (np) {
  		of_platform_device_create(np, "temperature", NULL);
  		of_node_put(np);
  	}
  
  	return 0;
  }
  machine_device_initcall(powermac, pmac_declare_of_platform_devices);
  
  #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
  /*
   * This is called very early, as part of console_init() (typically just after
   * time_init()). This function is respondible for trying to find a good
   * default console on serial ports. It tries to match the open firmware
   * default output with one of the available serial console drivers.
   */
  static int __init check_pmac_serial_console(void)
  {
  	struct device_node *prom_stdout = NULL;
  	int offset = 0;
  	const char *name;
  #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
  	char *devname = "ttyS";
  #else
  	char *devname = "ttyPZ";
  #endif
  
  	pr_debug(" -> check_pmac_serial_console()\n");
  
  	/* The user has requested a console so this is already set up. */
  	if (strstr(boot_command_line, "console=")) {
  		pr_debug(" console was specified !\n");
  		return -EBUSY;
  	}
  
  	if (!of_chosen) {
  		pr_debug(" of_chosen is NULL !\n");
  		return -ENODEV;
  	}
  
  	/* We are getting a weird phandle from OF ... */
  	/* ... So use the full path instead */
  	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
  	if (name == NULL) {
  		pr_debug(" no linux,stdout-path !\n");
  		return -ENODEV;
  	}
  	prom_stdout = of_find_node_by_path(name);
  	if (!prom_stdout) {
  		pr_debug(" can't find stdout package %s !\n", name);
  		return -ENODEV;
  	}
  	pr_debug("stdout is %pOF\n", prom_stdout);
  
  	if (of_node_name_eq(prom_stdout, "ch-a"))
  		offset = 0;
  	else if (of_node_name_eq(prom_stdout, "ch-b"))
  		offset = 1;
  	else
  		goto not_found;
  	of_node_put(prom_stdout);
  
  	pr_debug("Found serial console at %s%d\n", devname, offset);
  
  	return add_preferred_console(devname, offset, NULL);
  
   not_found:
  	pr_debug("No preferred console found !\n");
  	of_node_put(prom_stdout);
  	return -ENODEV;
  }
  console_initcall(check_pmac_serial_console);
  
  #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
  
  /*
   * Called very early, MMU is off, device-tree isn't unflattened
   */
  static int __init pmac_probe(void)
  {
  	if (!of_machine_is_compatible("Power Macintosh") &&
  	    !of_machine_is_compatible("MacRISC"))
  		return 0;
  
  #ifdef CONFIG_PPC32
  	/* isa_io_base gets set in pmac_pci_init */
  	ISA_DMA_THRESHOLD = ~0L;
  	DMA_MODE_READ = 1;
  	DMA_MODE_WRITE = 2;
  #endif /* CONFIG_PPC32 */
  
  	pm_power_off = pmac_power_off;
  
  	pmac_init();
  
  	return 1;
  }
  
  define_machine(powermac) {
  	.name			= "PowerMac",
  	.probe			= pmac_probe,
  	.setup_arch		= pmac_setup_arch,
  	.show_cpuinfo		= pmac_show_cpuinfo,
  	.init_IRQ		= pmac_pic_init,
  	.get_irq		= NULL,	/* changed later */
  	.pci_irq_fixup		= pmac_pci_irq_fixup,
  	.restart		= pmac_restart,
  	.halt			= pmac_halt,
  	.time_init		= pmac_time_init,
  	.get_boot_time		= pmac_get_boot_time,
  	.set_rtc_time		= pmac_set_rtc_time,
  	.get_rtc_time		= pmac_get_rtc_time,
  	.calibrate_decr		= pmac_calibrate_decr,
  	.feature_call		= pmac_do_feature_call,
  	.progress		= udbg_progress,
  #ifdef CONFIG_PPC64
  	.power_save		= power4_idle,
  	.enable_pmcs		= power4_enable_pmcs,
  #endif /* CONFIG_PPC64 */
  #ifdef CONFIG_PPC32
  	.pcibios_after_init	= pmac_pcibios_after_init,
  	.phys_mem_access_prot	= pci_phys_mem_access_prot,
  #endif
  };
  