[POWERPC] Cleanup pseries kexec code
[linux-2.6.git] / arch / powerpc / platforms / pseries / setup.c
1 /*
2  *  64-bit pSeries and RS/6000 setup code.
3  *
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
8  *
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.
13  */
14
15 /*
16  * bootup setup stuff..
17  */
18
19 #undef DEBUG
20
21 #include <linux/cpu.h>
22 #include <linux/errno.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
25 #include <linux/mm.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>
46
47 #include <asm/mmu.h>
48 #include <asm/processor.h>
49 #include <asm/io.h>
50 #include <asm/pgtable.h>
51 #include <asm/prom.h>
52 #include <asm/rtas.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/iommu.h>
55 #include <asm/dma.h>
56 #include <asm/machdep.h>
57 #include <asm/irq.h>
58 #include <asm/time.h>
59 #include <asm/nvram.h>
60 #include "xics.h"
61 #include <asm/pmc.h>
62 #include <asm/mpic.h>
63 #include <asm/ppc-pci.h>
64 #include <asm/i8259.h>
65 #include <asm/udbg.h>
66 #include <asm/smp.h>
67 #include <asm/firmware.h>
68
69 #include "plpar_wrappers.h"
70 #include "pseries.h"
71
72 #ifdef DEBUG
73 #define DBG(fmt...) udbg_printf(fmt)
74 #else
75 #define DBG(fmt...)
76 #endif
77
78 /* move those away to a .h */
79 extern void find_udbg_vterm(void);
80
81 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
82
83 static void pseries_shared_idle_sleep(void);
84 static void pseries_dedicated_idle_sleep(void);
85
86 static struct device_node *pSeries_mpic_node;
87
88 static void pSeries_show_cpuinfo(struct seq_file *m)
89 {
90         struct device_node *root;
91         const char *model = "";
92
93         root = of_find_node_by_path("/");
94         if (root)
95                 model = get_property(root, "model", NULL);
96         seq_printf(m, "machine\t\t: CHRP %s\n", model);
97         of_node_put(root);
98 }
99
100 /* Initialize firmware assisted non-maskable interrupts if
101  * the firmware supports this feature.
102  */
103 static void __init fwnmi_init(void)
104 {
105         unsigned long system_reset_addr, machine_check_addr;
106
107         int ibm_nmi_register = rtas_token("ibm,nmi-register");
108         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
109                 return;
110
111         /* If the kernel's not linked at zero we point the firmware at low
112          * addresses anyway, and use a trampoline to get to the real code. */
113         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
114         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
115
116         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
117                                 machine_check_addr))
118                 fwnmi_active = 1;
119 }
120
121 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
122 {
123         unsigned int cascade_irq = i8259_irq();
124         if (cascade_irq != NO_IRQ)
125                 generic_handle_irq(cascade_irq);
126         desc->chip->eoi(irq);
127 }
128
129 static void __init pseries_mpic_init_IRQ(void)
130 {
131         struct device_node *np, *old, *cascade = NULL;
132         const unsigned int *addrp;
133         unsigned long intack = 0;
134         const unsigned int *opprop;
135         unsigned long openpic_addr = 0;
136         unsigned int cascade_irq;
137         int naddr, n, i, opplen;
138         struct mpic *mpic;
139
140         np = of_find_node_by_path("/");
141         naddr = prom_n_addr_cells(np);
142         opprop = get_property(np, "platform-open-pic", &opplen);
143         if (opprop != 0) {
144                 openpic_addr = of_read_number(opprop, naddr);
145                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
146         }
147         of_node_put(np);
148
149         BUG_ON(openpic_addr == 0);
150
151         /* Setup the openpic driver */
152         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
153                           MPIC_PRIMARY,
154                           16, 250, /* isu size, irq count */
155                           " MPIC     ");
156         BUG_ON(mpic == NULL);
157
158         /* Add ISUs */
159         opplen /= sizeof(u32);
160         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
161                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
162                 mpic_assign_isu(mpic, n, isuaddr);
163         }
164
165         /* All ISUs are setup, complete initialization */
166         mpic_init(mpic);
167
168         /* Look for cascade */
169         for_each_node_by_type(np, "interrupt-controller")
170                 if (device_is_compatible(np, "chrp,iic")) {
171                         cascade = np;
172                         break;
173                 }
174         if (cascade == NULL)
175                 return;
176
177         cascade_irq = irq_of_parse_and_map(cascade, 0);
178         if (cascade == NO_IRQ) {
179                 printk(KERN_ERR "mpic: failed to map cascade interrupt");
180                 return;
181         }
182
183         /* Check ACK type */
184         for (old = of_node_get(cascade); old != NULL ; old = np) {
185                 np = of_get_parent(old);
186                 of_node_put(old);
187                 if (np == NULL)
188                         break;
189                 if (strcmp(np->name, "pci") != 0)
190                         continue;
191                 addrp = get_property(np, "8259-interrupt-acknowledge",
192                                             NULL);
193                 if (addrp == NULL)
194                         continue;
195                 naddr = prom_n_addr_cells(np);
196                 intack = addrp[naddr-1];
197                 if (naddr > 1)
198                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
199         }
200         if (intack)
201                 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
202                        intack);
203         i8259_init(cascade, intack);
204         of_node_put(cascade);
205         set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
206 }
207
208 static void pseries_lpar_enable_pmcs(void)
209 {
210         unsigned long set, reset;
211
212         set = 1UL << 63;
213         reset = 0;
214         plpar_hcall_norets(H_PERFMON, set, reset);
215
216         /* instruct hypervisor to maintain PMCs */
217         if (firmware_has_feature(FW_FEATURE_SPLPAR))
218                 get_lppaca()->pmcregs_in_use = 1;
219 }
220
221 static void __init pseries_discover_pic(void)
222 {
223         struct device_node *np;
224         const char *typep;
225
226         for (np = NULL; (np = of_find_node_by_name(np,
227                                                    "interrupt-controller"));) {
228                 typep = get_property(np, "compatible", NULL);
229                 if (strstr(typep, "open-pic")) {
230                         pSeries_mpic_node = of_node_get(np);
231                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
232                         ppc_md.get_irq        = mpic_get_irq;
233                         setup_kexec_cpu_down_mpic();
234                         smp_init_pseries_mpic();
235                         return;
236                 } else if (strstr(typep, "ppc-xicp")) {
237                         ppc_md.init_IRQ       = xics_init_IRQ;
238                         setup_kexec_cpu_down_xics();
239                         smp_init_pseries_xics();
240                         return;
241                 }
242         }
243         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
244                " interrupt-controller\n");
245 }
246
247 static void __init pSeries_setup_arch(void)
248 {
249         /* Discover PIC type and setup ppc_md accordingly */
250         pseries_discover_pic();
251
252         /* openpic global configuration register (64-bit format). */
253         /* openpic Interrupt Source Unit pointer (64-bit format). */
254         /* python0 facility area (mmio) (64-bit format) REAL address. */
255
256         /* init to some ~sane value until calibrate_delay() runs */
257         loops_per_jiffy = 50000000;
258
259         if (ROOT_DEV == 0) {
260                 printk("No ramdisk, default root is /dev/sda2\n");
261                 ROOT_DEV = Root_SDA2;
262         }
263
264         fwnmi_init();
265
266         /* Find and initialize PCI host bridges */
267         init_pci_config_tokens();
268         find_and_init_phbs();
269         eeh_init();
270
271         pSeries_nvram_init();
272
273         /* Choose an idle loop */
274         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
275                 vpa_init(boot_cpuid);
276                 if (get_lppaca()->shared_proc) {
277                         printk(KERN_DEBUG "Using shared processor idle loop\n");
278                         ppc_md.power_save = pseries_shared_idle_sleep;
279                 } else {
280                         printk(KERN_DEBUG "Using dedicated idle loop\n");
281                         ppc_md.power_save = pseries_dedicated_idle_sleep;
282                 }
283         } else {
284                 printk(KERN_DEBUG "Using default idle loop\n");
285         }
286
287         if (firmware_has_feature(FW_FEATURE_LPAR))
288                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
289         else
290                 ppc_md.enable_pmcs = power4_enable_pmcs;
291 }
292
293 static int __init pSeries_init_panel(void)
294 {
295         /* Manually leave the kernel version on the panel. */
296         ppc_md.progress("Linux ppc64\n", 0);
297         ppc_md.progress(init_utsname()->version, 0);
298
299         return 0;
300 }
301 arch_initcall(pSeries_init_panel);
302
303 static int pseries_set_dabr(unsigned long dabr)
304 {
305         return plpar_hcall_norets(H_SET_DABR, dabr);
306 }
307
308 static int pseries_set_xdabr(unsigned long dabr)
309 {
310         /* We want to catch accesses from kernel and userspace */
311         return plpar_hcall_norets(H_SET_XDABR, dabr,
312                         H_DABRX_KERNEL | H_DABRX_USER);
313 }
314
315 /*
316  * Early initialization.  Relocation is on but do not reference unbolted pages
317  */
318 static void __init pSeries_init_early(void)
319 {
320         DBG(" -> pSeries_init_early()\n");
321
322         fw_feature_init();
323
324         if (firmware_has_feature(FW_FEATURE_LPAR))
325                 find_udbg_vterm();
326
327         if (firmware_has_feature(FW_FEATURE_DABR))
328                 ppc_md.set_dabr = pseries_set_dabr;
329         else if (firmware_has_feature(FW_FEATURE_XDABR))
330                 ppc_md.set_dabr = pseries_set_xdabr;
331
332         iommu_init_early_pSeries();
333
334         DBG(" <- pSeries_init_early()\n");
335 }
336
337
338 static int pSeries_check_legacy_ioport(unsigned int baseport)
339 {
340         struct device_node *np;
341
342 #define I8042_DATA_REG  0x60
343 #define FDC_BASE        0x3f0
344
345
346         switch(baseport) {
347         case I8042_DATA_REG:
348                 np = of_find_node_by_type(NULL, "8042");
349                 if (np == NULL)
350                         return -ENODEV;
351                 of_node_put(np);
352                 break;
353         case FDC_BASE:
354                 np = of_find_node_by_type(NULL, "fdc");
355                 if (np == NULL)
356                         return -ENODEV;
357                 of_node_put(np);
358                 break;
359         }
360         return 0;
361 }
362
363 /*
364  * Called very early, MMU is off, device-tree isn't unflattened
365  */
366
367 static int __init pSeries_probe_hypertas(unsigned long node,
368                                          const char *uname, int depth,
369                                          void *data)
370 {
371         if (depth != 1 ||
372             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
373                 return 0;
374
375         if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
376                 powerpc_firmware_features |= FW_FEATURE_LPAR;
377
378         return 1;
379 }
380
381 static int __init pSeries_probe(void)
382 {
383         unsigned long root = of_get_flat_dt_root();
384         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
385
386         if (dtype == NULL)
387                 return 0;
388         if (strcmp(dtype, "chrp"))
389                 return 0;
390
391         /* Cell blades firmware claims to be chrp while it's not. Until this
392          * is fixed, we need to avoid those here.
393          */
394         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
395             of_flat_dt_is_compatible(root, "IBM,CBEA"))
396                 return 0;
397
398         DBG("pSeries detected, looking for LPAR capability...\n");
399
400         /* Now try to figure out if we are running on LPAR */
401         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
402
403         if (firmware_has_feature(FW_FEATURE_LPAR))
404                 hpte_init_lpar();
405         else
406                 hpte_init_native();
407
408         DBG("Machine is%s LPAR !\n",
409             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
410
411         return 1;
412 }
413
414
415 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
416
417 static void pseries_dedicated_idle_sleep(void)
418
419         unsigned int cpu = smp_processor_id();
420         unsigned long start_snooze;
421
422         /*
423          * Indicate to the HV that we are idle. Now would be
424          * a good time to find other work to dispatch.
425          */
426         get_lppaca()->idle = 1;
427
428         /*
429          * We come in with interrupts disabled, and need_resched()
430          * has been checked recently.  If we should poll for a little
431          * while, do so.
432          */
433         if (__get_cpu_var(smt_snooze_delay)) {
434                 start_snooze = get_tb() +
435                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
436                 local_irq_enable();
437                 set_thread_flag(TIF_POLLING_NRFLAG);
438
439                 while (get_tb() < start_snooze) {
440                         if (need_resched() || cpu_is_offline(cpu))
441                                 goto out;
442                         ppc64_runlatch_off();
443                         HMT_low();
444                         HMT_very_low();
445                 }
446
447                 HMT_medium();
448                 clear_thread_flag(TIF_POLLING_NRFLAG);
449                 smp_mb();
450                 local_irq_disable();
451                 if (need_resched() || cpu_is_offline(cpu))
452                         goto out;
453         }
454
455         cede_processor();
456
457 out:
458         HMT_medium();
459         get_lppaca()->idle = 0;
460 }
461
462 static void pseries_shared_idle_sleep(void)
463 {
464         /*
465          * Indicate to the HV that we are idle. Now would be
466          * a good time to find other work to dispatch.
467          */
468         get_lppaca()->idle = 1;
469
470         /*
471          * Yield the processor to the hypervisor.  We return if
472          * an external interrupt occurs (which are driven prior
473          * to returning here) or if a prod occurs from another
474          * processor. When returning here, external interrupts
475          * are enabled.
476          */
477         cede_processor();
478
479         get_lppaca()->idle = 0;
480 }
481
482 static int pSeries_pci_probe_mode(struct pci_bus *bus)
483 {
484         if (firmware_has_feature(FW_FEATURE_LPAR))
485                 return PCI_PROBE_DEVTREE;
486         return PCI_PROBE_NORMAL;
487 }
488
489 define_machine(pseries) {
490         .name                   = "pSeries",
491         .probe                  = pSeries_probe,
492         .setup_arch             = pSeries_setup_arch,
493         .init_early             = pSeries_init_early,
494         .show_cpuinfo           = pSeries_show_cpuinfo,
495         .log_error              = pSeries_log_error,
496         .pcibios_fixup          = pSeries_final_fixup,
497         .pci_probe_mode         = pSeries_pci_probe_mode,
498         .restart                = rtas_restart,
499         .power_off              = rtas_power_off,
500         .halt                   = rtas_halt,
501         .panic                  = rtas_os_term,
502         .get_boot_time          = rtas_get_boot_time,
503         .get_rtc_time           = rtas_get_rtc_time,
504         .set_rtc_time           = rtas_set_rtc_time,
505         .calibrate_decr         = generic_calibrate_decr,
506         .progress               = rtas_progress,
507         .check_legacy_ioport    = pSeries_check_legacy_ioport,
508         .system_reset_exception = pSeries_system_reset_exception,
509         .machine_check_exception = pSeries_machine_check_exception,
510 };