1 files changed, 607 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
new file mode 100644
index 000000000000..10cb0f2d9b5b
--- /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,
+};