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-rw-r--r--arch/powerpc/platforms/pseries/setup.c607
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diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
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index 00000000000..10cb0f2d9b5
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -0,0 +1,607 @@
+/*
+ * 64-bit pSeries and RS/6000 setup code.
+ *
+ * Copyright (C) 1995 Linus Torvalds
+ * Adapted from 'alpha' version by Gary Thomas
+ * Modified by Cort Dougan (cort@cs.nmt.edu)
+ * Modified by PPC64 Team, IBM Corp
+ *
+ * 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..
+ */
+
+#undef DEBUG
+
+#include <linux/config.h>
+#include <linux/cpu.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/slab.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/tty.h>
+#include <linux/major.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/console.h>
+#include <linux/pci.h>
+#include <linux/utsname.h>
+#include <linux/adb.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/seq_file.h>
+#include <linux/root_dev.h>
+
+#include <asm/mmu.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/prom.h>
+#include <asm/rtas.h>
+#include <asm/pci-bridge.h>
+#include <asm/iommu.h>
+#include <asm/dma.h>
+#include <asm/machdep.h>
+#include <asm/irq.h>
+#include <asm/time.h>
+#include <asm/nvram.h>
+#include <asm/plpar_wrappers.h>
+#include "xics.h"
+#include <asm/firmware.h>
+#include <asm/pmc.h>
+#include <asm/mpic.h>
+#include <asm/ppc-pci.h>
+#include <asm/i8259.h>
+#include <asm/udbg.h>
+
+#include "rtas-fw.h"
+
+#ifdef DEBUG
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+extern void find_udbg_vterm(void);
+extern void system_reset_fwnmi(void); /* from head.S */
+extern void machine_check_fwnmi(void); /* from head.S */
+extern void generic_find_legacy_serial_ports(u64 *physport,
+ unsigned int *default_speed);
+
+int fwnmi_active; /* TRUE if an FWNMI handler is present */
+
+extern void pSeries_system_reset_exception(struct pt_regs *regs);
+extern int pSeries_machine_check_exception(struct pt_regs *regs);
+
+static void pseries_shared_idle(void);
+static void pseries_dedicated_idle(void);
+
+struct mpic *pSeries_mpic;
+
+void pSeries_show_cpuinfo(struct seq_file *m)
+{
+ struct device_node *root;
+ const char *model = "";
+
+ root = of_find_node_by_path("/");
+ if (root)
+ model = get_property(root, "model", NULL);
+ seq_printf(m, "machine\t\t: CHRP %s\n", model);
+ of_node_put(root);
+}
+
+/* Initialize firmware assisted non-maskable interrupts if
+ * the firmware supports this feature.
+ *
+ */
+static void __init fwnmi_init(void)
+{
+ int ret;
+ int ibm_nmi_register = rtas_token("ibm,nmi-register");
+ if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
+ return;
+ ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
+ __pa((unsigned long)system_reset_fwnmi),
+ __pa((unsigned long)machine_check_fwnmi));
+ if (ret == 0)
+ fwnmi_active = 1;
+}
+
+static void __init pSeries_init_mpic(void)
+{
+ unsigned int *addrp;
+ struct device_node *np;
+ unsigned long intack = 0;
+
+ /* All ISUs are setup, complete initialization */
+ mpic_init(pSeries_mpic);
+
+ /* Check what kind of cascade ACK we have */
+ if (!(np = of_find_node_by_name(NULL, "pci"))
+ || !(addrp = (unsigned int *)
+ get_property(np, "8259-interrupt-acknowledge", NULL)))
+ printk(KERN_ERR "Cannot find pci to get ack address\n");
+ else
+ intack = addrp[prom_n_addr_cells(np)-1];
+ of_node_put(np);
+
+ /* Setup the legacy interrupts & controller */
+ i8259_init(intack, 0);
+
+ /* Hook cascade to mpic */
+ mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
+}
+
+static void __init pSeries_setup_mpic(void)
+{
+ unsigned int *opprop;
+ unsigned long openpic_addr = 0;
+ unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
+ struct device_node *root;
+ int irq_count;
+
+ /* Find the Open PIC if present */
+ root = of_find_node_by_path("/");
+ opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
+ if (opprop != 0) {
+ int n = prom_n_addr_cells(root);
+
+ for (openpic_addr = 0; n > 0; --n)
+ openpic_addr = (openpic_addr << 32) + *opprop++;
+ printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
+ }
+ of_node_put(root);
+
+ BUG_ON(openpic_addr == 0);
+
+ /* Get the sense values from OF */
+ prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
+
+ /* Setup the openpic driver */
+ irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
+ pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
+ 16, 16, irq_count, /* isu size, irq offset, irq count */
+ NR_IRQS - 4, /* ipi offset */
+ senses, irq_count, /* sense & sense size */
+ " MPIC ");
+}
+
+static void pseries_lpar_enable_pmcs(void)
+{
+ unsigned long set, reset;
+
+ power4_enable_pmcs();
+
+ set = 1UL << 63;
+ reset = 0;
+ plpar_hcall_norets(H_PERFMON, set, reset);
+
+ /* instruct hypervisor to maintain PMCs */
+ if (firmware_has_feature(FW_FEATURE_SPLPAR))
+ get_paca()->lppaca.pmcregs_in_use = 1;
+}
+
+static void __init pSeries_setup_arch(void)
+{
+ /* Fixup ppc_md depending on the type of interrupt controller */
+ if (ppc64_interrupt_controller == IC_OPEN_PIC) {
+ ppc_md.init_IRQ = pSeries_init_mpic;
+ ppc_md.get_irq = mpic_get_irq;
+ ppc_md.cpu_irq_down = mpic_teardown_this_cpu;
+ /* Allocate the mpic now, so that find_and_init_phbs() can
+ * fill the ISUs */
+ pSeries_setup_mpic();
+ } else {
+ ppc_md.init_IRQ = xics_init_IRQ;
+ ppc_md.get_irq = xics_get_irq;
+ ppc_md.cpu_irq_down = xics_teardown_cpu;
+ }
+
+#ifdef CONFIG_SMP
+ smp_init_pSeries();
+#endif
+ /* openpic global configuration register (64-bit format). */
+ /* openpic Interrupt Source Unit pointer (64-bit format). */
+ /* python0 facility area (mmio) (64-bit format) REAL address. */
+
+ /* init to some ~sane value until calibrate_delay() runs */
+ loops_per_jiffy = 50000000;
+
+ if (ROOT_DEV == 0) {
+ printk("No ramdisk, default root is /dev/sda2\n");
+ ROOT_DEV = Root_SDA2;
+ }
+
+ fwnmi_init();
+
+ /* Find and initialize PCI host bridges */
+ init_pci_config_tokens();
+ find_and_init_phbs();
+ eeh_init();
+
+ pSeries_nvram_init();
+
+ /* Choose an idle loop */
+ if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
+ vpa_init(boot_cpuid);
+ if (get_paca()->lppaca.shared_proc) {
+ printk(KERN_INFO "Using shared processor idle loop\n");
+ ppc_md.idle_loop = pseries_shared_idle;
+ } else {
+ printk(KERN_INFO "Using dedicated idle loop\n");
+ ppc_md.idle_loop = pseries_dedicated_idle;
+ }
+ } else {
+ printk(KERN_INFO "Using default idle loop\n");
+ ppc_md.idle_loop = default_idle;
+ }
+
+ if (systemcfg->platform & PLATFORM_LPAR)
+ ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
+ else
+ ppc_md.enable_pmcs = power4_enable_pmcs;
+}
+
+static int __init pSeries_init_panel(void)
+{
+ /* Manually leave the kernel version on the panel. */
+ ppc_md.progress("Linux ppc64\n", 0);
+ ppc_md.progress(system_utsname.version, 0);
+
+ return 0;
+}
+arch_initcall(pSeries_init_panel);
+
+
+/* Build up the ppc64_firmware_features bitmask field
+ * using contents of device-tree/ibm,hypertas-functions.
+ * Ultimately this functionality may be moved into prom.c prom_init().
+ */
+static void __init fw_feature_init(void)
+{
+ struct device_node * dn;
+ char * hypertas;
+ unsigned int len;
+
+ DBG(" -> fw_feature_init()\n");
+
+ ppc64_firmware_features = 0;
+ dn = of_find_node_by_path("/rtas");
+ if (dn == NULL) {
+ printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
+ goto no_rtas;
+ }
+
+ hypertas = get_property(dn, "ibm,hypertas-functions", &len);
+ if (hypertas) {
+ while (len > 0){
+ int i, hypertas_len;
+ /* check value against table of strings */
+ for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
+ if ((firmware_features_table[i].name) &&
+ (strcmp(firmware_features_table[i].name,hypertas))==0) {
+ /* we have a match */
+ ppc64_firmware_features |=
+ (firmware_features_table[i].val);
+ break;
+ }
+ }
+ hypertas_len = strlen(hypertas);
+ len -= hypertas_len +1;
+ hypertas+= hypertas_len +1;
+ }
+ }
+
+ of_node_put(dn);
+ no_rtas:
+ printk(KERN_INFO "firmware_features = 0x%lx\n",
+ ppc64_firmware_features);
+
+ DBG(" <- fw_feature_init()\n");
+}
+
+
+static void __init pSeries_discover_pic(void)
+{
+ struct device_node *np;
+ char *typep;
+
+ /*
+ * Setup interrupt mapping options that are needed for finish_device_tree
+ * to properly parse the OF interrupt tree & do the virtual irq mapping
+ */
+ __irq_offset_value = NUM_ISA_INTERRUPTS;
+ ppc64_interrupt_controller = IC_INVALID;
+ for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
+ typep = (char *)get_property(np, "compatible", NULL);
+ if (strstr(typep, "open-pic"))
+ ppc64_interrupt_controller = IC_OPEN_PIC;
+ else if (strstr(typep, "ppc-xicp"))
+ ppc64_interrupt_controller = IC_PPC_XIC;
+ else
+ printk("pSeries_discover_pic: failed to recognize"
+ " interrupt-controller\n");
+ break;
+ }
+}
+
+static void pSeries_mach_cpu_die(void)
+{
+ local_irq_disable();
+ idle_task_exit();
+ /* Some hardware requires clearing the CPPR, while other hardware does not
+ * it is safe either way
+ */
+ pSeriesLP_cppr_info(0, 0);
+ rtas_stop_self();
+ /* Should never get here... */
+ BUG();
+ for(;;);
+}
+
+
+/*
+ * Early initialization. Relocation is on but do not reference unbolted pages
+ */
+static void __init pSeries_init_early(void)
+{
+ void *comport;
+ int iommu_off = 0;
+ unsigned int default_speed;
+ u64 physport;
+
+ DBG(" -> pSeries_init_early()\n");
+
+ fw_feature_init();
+
+ if (systemcfg->platform & PLATFORM_LPAR)
+ hpte_init_lpar();
+ else {
+ hpte_init_native();
+ iommu_off = (of_chosen &&
+ get_property(of_chosen, "linux,iommu-off", NULL));
+ }
+
+ generic_find_legacy_serial_ports(&physport, &default_speed);
+
+ if (systemcfg->platform & PLATFORM_LPAR)
+ find_udbg_vterm();
+ else if (physport) {
+ /* Map the uart for udbg. */
+ comport = (void *)ioremap(physport, 16);
+ udbg_init_uart(comport, default_speed);
+
+ DBG("Hello World !\n");
+ }
+
+
+ iommu_init_early_pSeries();
+
+ pSeries_discover_pic();
+
+ DBG(" <- pSeries_init_early()\n");
+}
+
+
+static int pSeries_check_legacy_ioport(unsigned int baseport)
+{
+ struct device_node *np;
+
+#define I8042_DATA_REG 0x60
+#define FDC_BASE 0x3f0
+
+
+ switch(baseport) {
+ case I8042_DATA_REG:
+ np = of_find_node_by_type(NULL, "8042");
+ if (np == NULL)
+ return -ENODEV;
+ of_node_put(np);
+ break;
+ case FDC_BASE:
+ np = of_find_node_by_type(NULL, "fdc");
+ if (np == NULL)
+ return -ENODEV;
+ of_node_put(np);
+ break;
+ }
+ return 0;
+}
+
+/*
+ * Called very early, MMU is off, device-tree isn't unflattened
+ */
+extern struct machdep_calls pSeries_md;
+
+static int __init pSeries_probe(int platform)
+{
+ if (platform != PLATFORM_PSERIES &&
+ platform != PLATFORM_PSERIES_LPAR)
+ return 0;
+
+ /* if we have some ppc_md fixups for LPAR to do, do
+ * it here ...
+ */
+
+ return 1;
+}
+
+DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
+
+static inline void dedicated_idle_sleep(unsigned int cpu)
+{
+ struct paca_struct *ppaca = &paca[cpu ^ 1];
+
+ /* Only sleep if the other thread is not idle */
+ if (!(ppaca->lppaca.idle)) {
+ local_irq_disable();
+
+ /*
+ * We are about to sleep the thread and so wont be polling any
+ * more.
+ */
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+
+ /*
+ * SMT dynamic mode. Cede will result in this thread going
+ * dormant, if the partner thread is still doing work. Thread
+ * wakes up if partner goes idle, an interrupt is presented, or
+ * a prod occurs. Returning from the cede enables external
+ * interrupts.
+ */
+ if (!need_resched())
+ cede_processor();
+ else
+ local_irq_enable();
+ } else {
+ /*
+ * Give the HV an opportunity at the processor, since we are
+ * not doing any work.
+ */
+ poll_pending();
+ }
+}
+
+static void pseries_dedicated_idle(void)
+{
+ long oldval;
+ struct paca_struct *lpaca = get_paca();
+ unsigned int cpu = smp_processor_id();
+ unsigned long start_snooze;
+ unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
+
+ while (1) {
+ /*
+ * Indicate to the HV that we are idle. Now would be
+ * a good time to find other work to dispatch.
+ */
+ lpaca->lppaca.idle = 1;
+
+ oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
+ if (!oldval) {
+ set_thread_flag(TIF_POLLING_NRFLAG);
+
+ start_snooze = __get_tb() +
+ *smt_snooze_delay * tb_ticks_per_usec;
+
+ while (!need_resched() && !cpu_is_offline(cpu)) {
+ ppc64_runlatch_off();
+
+ /*
+ * Go into low thread priority and possibly
+ * low power mode.
+ */
+ HMT_low();
+ HMT_very_low();
+
+ if (*smt_snooze_delay != 0 &&
+ __get_tb() > start_snooze) {
+ HMT_medium();
+ dedicated_idle_sleep(cpu);
+ }
+
+ }
+
+ HMT_medium();
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+ } else {
+ set_need_resched();
+ }
+
+ lpaca->lppaca.idle = 0;
+ ppc64_runlatch_on();
+
+ schedule();
+
+ if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
+ cpu_die();
+ }
+}
+
+static void pseries_shared_idle(void)
+{
+ struct paca_struct *lpaca = get_paca();
+ unsigned int cpu = smp_processor_id();
+
+ while (1) {
+ /*
+ * Indicate to the HV that we are idle. Now would be
+ * a good time to find other work to dispatch.
+ */
+ lpaca->lppaca.idle = 1;
+
+ while (!need_resched() && !cpu_is_offline(cpu)) {
+ local_irq_disable();
+ ppc64_runlatch_off();
+
+ /*
+ * Yield the processor to the hypervisor. We return if
+ * an external interrupt occurs (which are driven prior
+ * to returning here) or if a prod occurs from another
+ * processor. When returning here, external interrupts
+ * are enabled.
+ *
+ * Check need_resched() again with interrupts disabled
+ * to avoid a race.
+ */
+ if (!need_resched())
+ cede_processor();
+ else
+ local_irq_enable();
+
+ HMT_medium();
+ }
+
+ lpaca->lppaca.idle = 0;
+ ppc64_runlatch_on();
+
+ schedule();
+
+ if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
+ cpu_die();
+ }
+}
+
+static int pSeries_pci_probe_mode(struct pci_bus *bus)
+{
+ if (systemcfg->platform & PLATFORM_LPAR)
+ return PCI_PROBE_DEVTREE;
+ return PCI_PROBE_NORMAL;
+}
+
+struct machdep_calls __initdata pSeries_md = {
+ .probe = pSeries_probe,
+ .setup_arch = pSeries_setup_arch,
+ .init_early = pSeries_init_early,
+ .show_cpuinfo = pSeries_show_cpuinfo,
+ .log_error = pSeries_log_error,
+ .pcibios_fixup = pSeries_final_fixup,
+ .pci_probe_mode = pSeries_pci_probe_mode,
+ .irq_bus_setup = pSeries_irq_bus_setup,
+ .restart = rtas_fw_restart,
+ .power_off = rtas_fw_power_off,
+ .halt = rtas_fw_halt,
+ .panic = rtas_os_term,
+ .cpu_die = pSeries_mach_cpu_die,
+ .get_boot_time = rtas_get_boot_time,
+ .get_rtc_time = rtas_get_rtc_time,
+ .set_rtc_time = rtas_set_rtc_time,
+ .calibrate_decr = generic_calibrate_decr,
+ .progress = rtas_progress,
+ .check_legacy_ioport = pSeries_check_legacy_ioport,
+ .system_reset_exception = pSeries_system_reset_exception,
+ .machine_check_exception = pSeries_machine_check_exception,
+};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-29 14:09:06 +0000