2 * 64-bit pSeries and RS/6000 setup code.
4 * Copyright (C) 1995 Linus Torvalds
5 * Adapted from 'alpha' version by Gary Thomas
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * Modified by PPC64 Team, IBM Corp
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
16 * bootup setup stuff..
21 #include <linux/cpu.h>
22 #include <linux/errno.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
26 #include <linux/stddef.h>
27 #include <linux/unistd.h>
28 #include <linux/slab.h>
29 #include <linux/user.h>
30 #include <linux/a.out.h>
31 #include <linux/tty.h>
32 #include <linux/major.h>
33 #include <linux/interrupt.h>
34 #include <linux/reboot.h>
35 #include <linux/init.h>
36 #include <linux/ioport.h>
37 #include <linux/console.h>
38 #include <linux/pci.h>
39 #include <linux/utsname.h>
40 #include <linux/adb.h>
41 #include <linux/module.h>
42 #include <linux/delay.h>
43 #include <linux/irq.h>
44 #include <linux/seq_file.h>
45 #include <linux/root_dev.h>
48 #include <asm/processor.h>
50 #include <asm/pgtable.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/iommu.h>
56 #include <asm/machdep.h>
59 #include <asm/nvram.h>
63 #include <asm/ppc-pci.h>
64 #include <asm/i8259.h>
67 #include <asm/firmware.h>
70 #include "plpar_wrappers.h"
74 #define DBG(fmt...) udbg_printf(fmt)
79 int fwnmi_active; /* TRUE if an FWNMI handler is present */
81 static void pseries_shared_idle_sleep(void);
82 static void pseries_dedicated_idle_sleep(void);
84 static struct device_node *pSeries_mpic_node;
86 static void pSeries_show_cpuinfo(struct seq_file *m)
88 struct device_node *root;
89 const char *model = "";
91 root = of_find_node_by_path("/");
93 model = of_get_property(root, "model", NULL);
94 seq_printf(m, "machine\t\t: CHRP %s\n", model);
98 /* Initialize firmware assisted non-maskable interrupts if
99 * the firmware supports this feature.
101 static void __init fwnmi_init(void)
103 unsigned long system_reset_addr, machine_check_addr;
105 int ibm_nmi_register = rtas_token("ibm,nmi-register");
106 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
109 /* If the kernel's not linked at zero we point the firmware at low
110 * addresses anyway, and use a trampoline to get to the real code. */
111 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
112 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
114 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
119 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
121 unsigned int cascade_irq = i8259_irq();
122 if (cascade_irq != NO_IRQ)
123 generic_handle_irq(cascade_irq);
124 desc->chip->eoi(irq);
127 static void __init pseries_mpic_init_IRQ(void)
129 struct device_node *np, *old, *cascade = NULL;
130 const unsigned int *addrp;
131 unsigned long intack = 0;
132 const unsigned int *opprop;
133 unsigned long openpic_addr = 0;
134 unsigned int cascade_irq;
135 int naddr, n, i, opplen;
138 np = of_find_node_by_path("/");
139 naddr = of_n_addr_cells(np);
140 opprop = of_get_property(np, "platform-open-pic", &opplen);
142 openpic_addr = of_read_number(opprop, naddr);
143 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
147 BUG_ON(openpic_addr == 0);
149 /* Setup the openpic driver */
150 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
152 16, 250, /* isu size, irq count */
154 BUG_ON(mpic == NULL);
157 opplen /= sizeof(u32);
158 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
159 unsigned long isuaddr = of_read_number(opprop + i, naddr);
160 mpic_assign_isu(mpic, n, isuaddr);
163 /* All ISUs are setup, complete initialization */
166 /* Look for cascade */
167 for_each_node_by_type(np, "interrupt-controller")
168 if (of_device_is_compatible(np, "chrp,iic")) {
175 cascade_irq = irq_of_parse_and_map(cascade, 0);
176 if (cascade_irq == NO_IRQ) {
177 printk(KERN_ERR "mpic: failed to map cascade interrupt");
182 for (old = of_node_get(cascade); old != NULL ; old = np) {
183 np = of_get_parent(old);
187 if (strcmp(np->name, "pci") != 0)
189 addrp = of_get_property(np, "8259-interrupt-acknowledge",
193 naddr = of_n_addr_cells(np);
194 intack = addrp[naddr-1];
196 intack |= ((unsigned long)addrp[naddr-2]) << 32;
199 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
201 i8259_init(cascade, intack);
202 of_node_put(cascade);
203 set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
206 static void pseries_lpar_enable_pmcs(void)
208 unsigned long set, reset;
212 plpar_hcall_norets(H_PERFMON, set, reset);
214 /* instruct hypervisor to maintain PMCs */
215 if (firmware_has_feature(FW_FEATURE_SPLPAR))
216 get_lppaca()->pmcregs_in_use = 1;
219 static void __init pseries_discover_pic(void)
221 struct device_node *np;
224 for (np = NULL; (np = of_find_node_by_name(np,
225 "interrupt-controller"));) {
226 typep = of_get_property(np, "compatible", NULL);
227 if (strstr(typep, "open-pic")) {
228 pSeries_mpic_node = of_node_get(np);
229 ppc_md.init_IRQ = pseries_mpic_init_IRQ;
230 ppc_md.get_irq = mpic_get_irq;
231 setup_kexec_cpu_down_mpic();
232 smp_init_pseries_mpic();
234 } else if (strstr(typep, "ppc-xicp")) {
235 ppc_md.init_IRQ = xics_init_IRQ;
236 setup_kexec_cpu_down_xics();
237 smp_init_pseries_xics();
241 printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
242 " interrupt-controller\n");
245 static void __init pSeries_setup_arch(void)
247 /* Discover PIC type and setup ppc_md accordingly */
248 pseries_discover_pic();
250 /* openpic global configuration register (64-bit format). */
251 /* openpic Interrupt Source Unit pointer (64-bit format). */
252 /* python0 facility area (mmio) (64-bit format) REAL address. */
254 /* init to some ~sane value until calibrate_delay() runs */
255 loops_per_jiffy = 50000000;
259 /* Find and initialize PCI host bridges */
260 init_pci_config_tokens();
261 find_and_init_phbs();
264 pSeries_nvram_init();
266 /* Choose an idle loop */
267 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
268 vpa_init(boot_cpuid);
269 if (get_lppaca()->shared_proc) {
270 printk(KERN_DEBUG "Using shared processor idle loop\n");
271 ppc_md.power_save = pseries_shared_idle_sleep;
273 printk(KERN_DEBUG "Using dedicated idle loop\n");
274 ppc_md.power_save = pseries_dedicated_idle_sleep;
277 printk(KERN_DEBUG "Using default idle loop\n");
280 if (firmware_has_feature(FW_FEATURE_LPAR))
281 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
283 ppc_md.enable_pmcs = power4_enable_pmcs;
286 static int __init pSeries_init_panel(void)
288 /* Manually leave the kernel version on the panel. */
289 ppc_md.progress("Linux ppc64\n", 0);
290 ppc_md.progress(init_utsname()->version, 0);
294 arch_initcall(pSeries_init_panel);
296 static int pseries_set_dabr(unsigned long dabr)
298 return plpar_hcall_norets(H_SET_DABR, dabr);
301 static int pseries_set_xdabr(unsigned long dabr)
303 /* We want to catch accesses from kernel and userspace */
304 return plpar_hcall_norets(H_SET_XDABR, dabr,
305 H_DABRX_KERNEL | H_DABRX_USER);
309 * Early initialization. Relocation is on but do not reference unbolted pages
311 static void __init pSeries_init_early(void)
313 DBG(" -> pSeries_init_early()\n");
315 if (firmware_has_feature(FW_FEATURE_LPAR))
318 if (firmware_has_feature(FW_FEATURE_DABR))
319 ppc_md.set_dabr = pseries_set_dabr;
320 else if (firmware_has_feature(FW_FEATURE_XDABR))
321 ppc_md.set_dabr = pseries_set_xdabr;
323 iommu_init_early_pSeries();
325 DBG(" <- pSeries_init_early()\n");
329 * Called very early, MMU is off, device-tree isn't unflattened
332 static int __init pSeries_probe_hypertas(unsigned long node,
333 const char *uname, int depth,
336 const char *hypertas;
340 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
343 hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
347 powerpc_firmware_features |= FW_FEATURE_LPAR;
348 fw_feature_init(hypertas, len);
353 static int __init pSeries_probe(void)
355 unsigned long root = of_get_flat_dt_root();
356 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
360 if (strcmp(dtype, "chrp"))
363 /* Cell blades firmware claims to be chrp while it's not. Until this
364 * is fixed, we need to avoid those here.
366 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
367 of_flat_dt_is_compatible(root, "IBM,CBEA"))
370 DBG("pSeries detected, looking for LPAR capability...\n");
372 /* Now try to figure out if we are running on LPAR */
373 of_scan_flat_dt(pSeries_probe_hypertas, NULL);
375 if (firmware_has_feature(FW_FEATURE_LPAR))
380 DBG("Machine is%s LPAR !\n",
381 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
387 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
389 static void pseries_dedicated_idle_sleep(void)
391 unsigned int cpu = smp_processor_id();
392 unsigned long start_snooze;
393 unsigned long in_purr, out_purr;
396 * Indicate to the HV that we are idle. Now would be
397 * a good time to find other work to dispatch.
399 get_lppaca()->idle = 1;
400 get_lppaca()->donate_dedicated_cpu = 1;
401 in_purr = mfspr(SPRN_PURR);
404 * We come in with interrupts disabled, and need_resched()
405 * has been checked recently. If we should poll for a little
408 if (__get_cpu_var(smt_snooze_delay)) {
409 start_snooze = get_tb() +
410 __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
412 set_thread_flag(TIF_POLLING_NRFLAG);
414 while (get_tb() < start_snooze) {
415 if (need_resched() || cpu_is_offline(cpu))
417 ppc64_runlatch_off();
423 clear_thread_flag(TIF_POLLING_NRFLAG);
426 if (need_resched() || cpu_is_offline(cpu))
434 out_purr = mfspr(SPRN_PURR);
435 get_lppaca()->wait_state_cycles += out_purr - in_purr;
436 get_lppaca()->donate_dedicated_cpu = 0;
437 get_lppaca()->idle = 0;
440 static void pseries_shared_idle_sleep(void)
443 * Indicate to the HV that we are idle. Now would be
444 * a good time to find other work to dispatch.
446 get_lppaca()->idle = 1;
449 * Yield the processor to the hypervisor. We return if
450 * an external interrupt occurs (which are driven prior
451 * to returning here) or if a prod occurs from another
452 * processor. When returning here, external interrupts
457 get_lppaca()->idle = 0;
460 static int pSeries_pci_probe_mode(struct pci_bus *bus)
462 if (firmware_has_feature(FW_FEATURE_LPAR))
463 return PCI_PROBE_DEVTREE;
464 return PCI_PROBE_NORMAL;
468 * pSeries_power_off - tell firmware about how to power off the system.
470 * This function calls either the power-off rtas token in normal cases
471 * or the ibm,power-off-ups token (if present & requested) in case of
472 * a power failure. If power-off token is used, power on will only be
473 * possible with power button press. If ibm,power-off-ups token is used
474 * it will allow auto poweron after power is restored.
476 void pSeries_power_off(void)
479 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
481 if (rtas_flash_term_hook)
482 rtas_flash_term_hook(SYS_POWER_OFF);
484 if (rtas_poweron_auto == 0 ||
485 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
486 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
487 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
489 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
490 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
496 void pSeries_final_fixup(void) { }
499 define_machine(pseries) {
501 .probe = pSeries_probe,
502 .setup_arch = pSeries_setup_arch,
503 .init_early = pSeries_init_early,
504 .show_cpuinfo = pSeries_show_cpuinfo,
505 .log_error = pSeries_log_error,
506 .pcibios_fixup = pSeries_final_fixup,
507 .pci_probe_mode = pSeries_pci_probe_mode,
508 .restart = rtas_restart,
509 .power_off = pSeries_power_off,
511 .panic = rtas_os_term,
512 .get_boot_time = rtas_get_boot_time,
513 .get_rtc_time = rtas_get_rtc_time,
514 .set_rtc_time = rtas_set_rtc_time,
515 .calibrate_decr = generic_calibrate_decr,
516 .progress = rtas_progress,
517 .system_reset_exception = pSeries_system_reset_exception,
518 .machine_check_exception = pSeries_machine_check_exception,