// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 1995 Linus Torvalds * Adapted from 'alpha' version by Gary Thomas * Modified by Cort Dougan (cort@cs.nmt.edu) */ /* * bootup setup stuff.. */ #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/user.h> #include <linux/tty.h> #include <linux/major.h> #include <linux/interrupt.h> #include <linux/reboot.h> #include <linux/init.h> #include <linux/pci.h> #include <generated/utsrelease.h> #include <linux/adb.h> #include <linux/module.h> #include <linux/delay.h> #include <linux/console.h> #include <linux/seq_file.h> #include <linux/root_dev.h> #include <linux/initrd.h> #include <linux/timer.h> #include <asm/io.h> #include <asm/pgtable.h> #include <asm/prom.h> #include <asm/pci-bridge.h> #include <asm/dma.h> #include <asm/machdep.h> #include <asm/irq.h> #include <asm/hydra.h> #include <asm/sections.h> #include <asm/time.h> #include <asm/i8259.h> #include <asm/mpic.h> #include <asm/rtas.h> #include <asm/xmon.h> #include "chrp.h" #include "gg2.h" void rtas_indicator_progress(char *, unsigned short); int _chrp_type; EXPORT_SYMBOL(_chrp_type); static struct mpic *chrp_mpic; /* Used for doing CHRP event-scans */ DEFINE_PER_CPU(struct timer_list, heartbeat_timer); unsigned long event_scan_interval; extern unsigned long loops_per_jiffy; /* To be replaced by RTAS when available */ static unsigned int __iomem *briq_SPOR; #ifdef CONFIG_SMP extern struct smp_ops_t chrp_smp_ops; #endif static const char *gg2_memtypes[4] = { "FPM", "SDRAM", "EDO", "BEDO" }; static const char *gg2_cachesizes[4] = { "256 KB", "512 KB", "1 MB", "Reserved" }; static const char *gg2_cachetypes[4] = { "Asynchronous", "Reserved", "Flow-Through Synchronous", "Pipelined Synchronous" }; static const char *gg2_cachemodes[4] = { "Disabled", "Write-Through", "Copy-Back", "Transparent Mode" }; static const char *chrp_names[] = { "Unknown", "","","", "Motorola", "IBM or Longtrail", "Genesi Pegasos", "Total Impact Briq" }; static void chrp_show_cpuinfo(struct seq_file *m) { int i, sdramen; unsigned int t; struct device_node *root; const char *model = ""; root = of_find_node_by_path("/"); if (root) model = of_get_property(root, "model", NULL); seq_printf(m, "machine\t\t: CHRP %s\n", model); /* longtrail (goldengate) stuff */ if (model && !strncmp(model, "IBM,LongTrail", 13)) { /* VLSI VAS96011/12 `Golden Gate 2' */ /* Memory banks */ sdramen = (in_le32(gg2_pci_config_base + GG2_PCI_DRAM_CTRL) >>31) & 1; for (i = 0; i < (sdramen ? 4 : 6); i++) { t = in_le32(gg2_pci_config_base+ GG2_PCI_DRAM_BANK0+ i*4); if (!(t & 1)) continue; switch ((t>>8) & 0x1f) { case 0x1f: model = "4 MB"; break; case 0x1e: model = "8 MB"; break; case 0x1c: model = "16 MB"; break; case 0x18: model = "32 MB"; break; case 0x10: model = "64 MB"; break; case 0x00: model = "128 MB"; break; default: model = "Reserved"; break; } seq_printf(m, "memory bank %d\t: %s %s\n", i, model, gg2_memtypes[sdramen ? 1 : ((t>>1) & 3)]); } /* L2 cache */ t = in_le32(gg2_pci_config_base+GG2_PCI_CC_CTRL); seq_printf(m, "board l2\t: %s %s (%s)\n", gg2_cachesizes[(t>>7) & 3], gg2_cachetypes[(t>>2) & 3], gg2_cachemodes[t & 3]); } of_node_put(root); } /* * Fixes for the National Semiconductor PC78308VUL SuperI/O * * Some versions of Open Firmware incorrectly initialize the IRQ settings * for keyboard and mouse */ static inline void __init sio_write(u8 val, u8 index) { outb(index, 0x15c); outb(val, 0x15d); } static inline u8 __init sio_read(u8 index) { outb(index, 0x15c); return inb(0x15d); } static void __init sio_fixup_irq(const char *name, u8 device, u8 level, u8 type) { u8 level0, type0, active; /* select logical device */ sio_write(device, 0x07); active = sio_read(0x30); level0 = sio_read(0x70); type0 = sio_read(0x71); if (level0 != level || type0 != type || !active) { printk(KERN_WARNING "sio: %s irq level %d, type %d, %sactive: " "remapping to level %d, type %d, active\n", name, level0, type0, !active ? "in" : "", level, type); sio_write(0x01, 0x30); sio_write(level, 0x70); sio_write(type, 0x71); } } static void __init sio_init(void) { struct device_node *root; const char *model; root = of_find_node_by_path("/"); if (!root) return; model = of_get_property(root, "model", NULL); if (model && !strncmp(model, "IBM,LongTrail", 13)) { /* logical device 0 (KBC/Keyboard) */ sio_fixup_irq("keyboard", 0, 1, 2); /* select logical device 1 (KBC/Mouse) */ sio_fixup_irq("mouse", 1, 12, 2); } of_node_put(root); } static void __init pegasos_set_l2cr(void) { struct device_node *np; /* On Pegasos, enable the l2 cache if needed, as the OF forgets it */ if (_chrp_type != _CHRP_Pegasos) return; /* Enable L2 cache if needed */ np = of_find_node_by_type(NULL, "cpu"); if (np != NULL) { const unsigned int *l2cr = of_get_property(np, "l2cr", NULL); if (l2cr == NULL) { printk ("Pegasos l2cr : no cpu l2cr property found\n"); goto out; } if (!((*l2cr) & 0x80000000)) { printk ("Pegasos l2cr : L2 cache was not active, " "activating\n"); _set_L2CR(0); _set_L2CR((*l2cr) | 0x80000000); } } out: of_node_put(np); } static void __noreturn briq_restart(char *cmd) { local_irq_disable(); if (briq_SPOR) out_be32(briq_SPOR, 0); for(;;); } /* * Per default, input/output-device points to the keyboard/screen * If no card is installed, the built-in serial port is used as a fallback. * But unfortunately, the firmware does not connect /chosen/{stdin,stdout} * the the built-in serial node. Instead, a /failsafe node is created. */ static __init void chrp_init(void) { struct device_node *node; const char *property; if (strstr(boot_command_line, "console=")) return; /* find the boot console from /chosen/stdout */ if (!of_chosen) return; node = of_find_node_by_path("/"); if (!node) return; property = of_get_property(node, "model", NULL); if (!property) goto out_put; if (strcmp(property, "Pegasos2")) goto out_put; /* this is a Pegasos2 */ property = of_get_property(of_chosen, "linux,stdout-path", NULL); if (!property) goto out_put; of_node_put(node); node = of_find_node_by_path(property); if (!node) return; if (!of_node_is_type(node, "serial")) goto out_put; /* * The 9pin connector is either /failsafe * or /pci@80000000/isa@C/serial@i2F8 * The optional graphics card has also type 'serial' in VGA mode. */ if (of_node_name_eq(node, "failsafe") || of_node_name_eq(node, "serial")) add_preferred_console("ttyS", 0, NULL); out_put: of_node_put(node); } static void __init chrp_setup_arch(void) { struct device_node *root = of_find_node_by_path("/"); const char *machine = NULL; /* init to some ~sane value until calibrate_delay() runs */ loops_per_jiffy = 50000000/HZ; if (root) machine = of_get_property(root, "model", NULL); if (machine && strncmp(machine, "Pegasos", 7) == 0) { _chrp_type = _CHRP_Pegasos; } else if (machine && strncmp(machine, "IBM", 3) == 0) { _chrp_type = _CHRP_IBM; } else if (machine && strncmp(machine, "MOT", 3) == 0) { _chrp_type = _CHRP_Motorola; } else if (machine && strncmp(machine, "TotalImpact,BRIQ-1", 18) == 0) { _chrp_type = _CHRP_briq; /* Map the SPOR register on briq and change the restart hook */ briq_SPOR = ioremap(0xff0000e8, 4); ppc_md.restart = briq_restart; } else { /* Let's assume it is an IBM chrp if all else fails */ _chrp_type = _CHRP_IBM; } of_node_put(root); printk("chrp type = %x [%s]\n", _chrp_type, chrp_names[_chrp_type]); rtas_initialize(); if (rtas_token("display-character") >= 0) ppc_md.progress = rtas_progress; /* use RTAS time-of-day routines if available */ if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) { ppc_md.get_boot_time = rtas_get_boot_time; ppc_md.get_rtc_time = rtas_get_rtc_time; ppc_md.set_rtc_time = rtas_set_rtc_time; } /* On pegasos, enable the L2 cache if not already done by OF */ pegasos_set_l2cr(); /* Lookup PCI host bridges */ chrp_find_bridges(); /* * Temporary fixes for PCI devices. * -- Geert */ hydra_init(); /* Mac I/O */ /* * Fix the Super I/O configuration */ sio_init(); pci_create_OF_bus_map(); /* * Print the banner, then scroll down so boot progress * can be printed. -- Cort */ if (ppc_md.progress) ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0x0); } static void chrp_8259_cascade(struct irq_desc *desc) { struct irq_chip *chip = irq_desc_get_chip(desc); unsigned int cascade_irq = i8259_irq(); if (cascade_irq) generic_handle_irq(cascade_irq); chip->irq_eoi(&desc->irq_data); } /* * Finds the open-pic node and sets up the mpic driver. */ static void __init chrp_find_openpic(void) { struct device_node *np, *root; int len, i, j; int isu_size; const unsigned int *iranges, *opprop = NULL; int oplen = 0; unsigned long opaddr; int na = 1; np = of_find_node_by_type(NULL, "open-pic"); if (np == NULL) return; root = of_find_node_by_path("/"); if (root) { opprop = of_get_property(root, "platform-open-pic", &oplen); na = of_n_addr_cells(root); } if (opprop && oplen >= na * sizeof(unsigned int)) { opaddr = opprop[na-1]; /* assume 32-bit */ oplen /= na * sizeof(unsigned int); } else { struct resource r; if (of_address_to_resource(np, 0, &r)) { goto bail; } opaddr = r.start; oplen = 0; } printk(KERN_INFO "OpenPIC at %lx\n", opaddr); iranges = of_get_property(np, "interrupt-ranges", &len); if (iranges == NULL) len = 0; /* non-distributed mpic */ else len /= 2 * sizeof(unsigned int); /* * The first pair of cells in interrupt-ranges refers to the * IDU; subsequent pairs refer to the ISUs. */ if (oplen < len) { printk(KERN_ERR "Insufficient addresses for distributed" " OpenPIC (%d < %d)\n", oplen, len); len = oplen; } isu_size = 0; if (len > 0 && iranges[1] != 0) { printk(KERN_INFO "OpenPIC irqs %d..%d in IDU\n", iranges[0], iranges[0] + iranges[1] - 1); } if (len > 1) isu_size = iranges[3]; chrp_mpic = mpic_alloc(np, opaddr, MPIC_NO_RESET, isu_size, 0, " MPIC "); if (chrp_mpic == NULL) { printk(KERN_ERR "Failed to allocate MPIC structure\n"); goto bail; } j = na - 1; for (i = 1; i < len; ++i) { iranges += 2; j += na; printk(KERN_INFO "OpenPIC irqs %d..%d in ISU at %x\n", iranges[0], iranges[0] + iranges[1] - 1, opprop[j]); mpic_assign_isu(chrp_mpic, i - 1, opprop[j]); } mpic_init(chrp_mpic); ppc_md.get_irq = mpic_get_irq; bail: of_node_put(root); of_node_put(np); } static void __init chrp_find_8259(void) { struct device_node *np, *pic = NULL; unsigned long chrp_int_ack = 0; unsigned int cascade_irq; /* Look for cascade */ for_each_node_by_type(np, "interrupt-controller") if (of_device_is_compatible(np, "chrp,iic")) { pic = np; break; } /* Ok, 8259 wasn't found. We need to handle the case where * we have a pegasos that claims to be chrp but doesn't have * a proper interrupt tree */ if (pic == NULL && chrp_mpic != NULL) { printk(KERN_ERR "i8259: Not found in device-tree" " assuming no legacy interrupts\n"); return; } /* Look for intack. In a perfect world, we would look for it on * the ISA bus that holds the 8259 but heh... Works that way. If * we ever see a problem, we can try to re-use the pSeries code here. * Also, Pegasos-type platforms don't have a proper node to start * from anyway */ for_each_node_by_name(np, "pci") { const unsigned int *addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL); if (addrp == NULL) continue; chrp_int_ack = addrp[of_n_addr_cells(np)-1]; break; } of_node_put(np); if (np == NULL) printk(KERN_WARNING "Cannot find PCI interrupt acknowledge" " address, polling\n"); i8259_init(pic, chrp_int_ack); if (ppc_md.get_irq == NULL) { ppc_md.get_irq = i8259_irq; irq_set_default_host(i8259_get_host()); } if (chrp_mpic != NULL) { cascade_irq = irq_of_parse_and_map(pic, 0); if (!cascade_irq) printk(KERN_ERR "i8259: failed to map cascade irq\n"); else irq_set_chained_handler(cascade_irq, chrp_8259_cascade); } } static void __init chrp_init_IRQ(void) { #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON) struct device_node *kbd; #endif chrp_find_openpic(); chrp_find_8259(); #ifdef CONFIG_SMP /* Pegasos has no MPIC, those ops would make it crash. It might be an * option to move setting them to after we probe the PIC though */ if (chrp_mpic != NULL) smp_ops = &chrp_smp_ops; #endif /* CONFIG_SMP */ if (_chrp_type == _CHRP_Pegasos) ppc_md.get_irq = i8259_irq; #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON) /* see if there is a keyboard in the device tree with a parent of type "adb" */ for_each_node_by_name(kbd, "keyboard") if (of_node_is_type(kbd->parent, "adb")) break; of_node_put(kbd); if (kbd) { if (request_irq(HYDRA_INT_ADB_NMI, xmon_irq, 0, "XMON break", NULL)) pr_err("Failed to register XMON break interrupt\n"); } #endif } static void __init chrp_init2(void) { #if IS_ENABLED(CONFIG_NVRAM) chrp_nvram_init(); #endif request_region(0x20,0x20,"pic1"); request_region(0xa0,0x20,"pic2"); request_region(0x00,0x20,"dma1"); request_region(0x40,0x20,"timer"); request_region(0x80,0x10,"dma page reg"); request_region(0xc0,0x20,"dma2"); if (ppc_md.progress) ppc_md.progress(" Have fun! ", 0x7777); } static int __init chrp_probe(void) { const char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(), "device_type", NULL); if (dtype == NULL) return 0; if (strcmp(dtype, "chrp")) return 0; DMA_MODE_READ = 0x44; DMA_MODE_WRITE = 0x48; pm_power_off = rtas_power_off; chrp_init(); return 1; } define_machine(chrp) { .name = "CHRP", .probe = chrp_probe, .setup_arch = chrp_setup_arch, .init = chrp_init2, .show_cpuinfo = chrp_show_cpuinfo, .init_IRQ = chrp_init_IRQ, .restart = rtas_restart, .halt = rtas_halt, .time_init = chrp_time_init, .set_rtc_time = chrp_set_rtc_time, .get_rtc_time = chrp_get_rtc_time, .calibrate_decr = generic_calibrate_decr, .phys_mem_access_prot = pci_phys_mem_access_prot, };