diff options
Diffstat (limited to 'arch/powerpc/platforms/powermac/setup.c')
| -rw-r--r-- | arch/powerpc/platforms/powermac/setup.c | 608 |
1 files changed, 608 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c new file mode 100644 index 000000000..04daa7f0a --- /dev/null +++ b/arch/powerpc/platforms/powermac/setup.c @@ -0,0 +1,608 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 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) + */ + +/* + * 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/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; + +#define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */ + +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 __init 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 __init 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 __init 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 + /* 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); + } + +#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 */ +} + +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 */ + 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, + .discover_phbs = pmac_pci_init, + .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 +}; |