blob: 2551da46b2a6e9938b223c158be8499a6f2658c9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Paul Mackerras033ef332005-10-26 17:05:24 +10002 * 64-bit pSeries and RS/6000 setup code.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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
Michael Ellerman62d60e92005-07-07 17:56:30 -070021#include <linux/cpu.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#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>
Olaf Heringcebb2b12005-07-10 19:35:15 +000039#include <linux/utsname.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#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>
Michael Ellerman3d1229d2005-11-14 23:35:00 +110058#include <asm/kexec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#include <asm/time.h>
60#include <asm/nvram.h>
David Gibson007e8f52005-10-28 15:35:50 +100061#include "xics.h"
Michael Ellerman180a3362005-08-09 11:13:36 +100062#include <asm/pmc.h>
Stephen Rothwellbbeb3f42005-09-27 13:51:59 +100063#include <asm/mpic.h>
Stephen Rothwelld3878992005-09-28 02:50:25 +100064#include <asm/ppc-pci.h>
Paul Mackerras69a80d32005-10-10 22:03:41 +100065#include <asm/i8259.h>
66#include <asm/udbg.h>
Paul Mackerras2249ca92005-11-07 13:18:13 +110067#include <asm/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Michael Ellermana1218722005-11-03 15:33:31 +110069#include "plpar_wrappers.h"
Arnd Bergmannc902be72006-01-04 19:55:53 +000070#include "ras.h"
Michael Ellerman19657462006-02-10 15:47:36 +110071#include "firmware.h"
Michael Ellermana1218722005-11-03 15:33:31 +110072
Linus Torvalds1da177e2005-04-16 15:20:36 -070073#ifdef DEBUG
74#define DBG(fmt...) udbg_printf(fmt)
75#else
76#define DBG(fmt...)
77#endif
78
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +100079/* move those away to a .h */
80extern void smp_init_pseries_mpic(void);
81extern void smp_init_pseries_xics(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082extern void find_udbg_vterm(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84int fwnmi_active; /* TRUE if an FWNMI handler is present */
85
Paul Mackerrasfbd77402006-03-27 15:06:20 +110086static void pseries_shared_idle_sleep(void);
87static void pseries_dedicated_idle_sleep(void);
Michael Ellerman62d60e92005-07-07 17:56:30 -070088
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +100089static struct device_node *pSeries_mpic_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Arnd Bergmann84461962006-01-11 00:00:02 +000091static void pSeries_show_cpuinfo(struct seq_file *m)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092{
93 struct device_node *root;
94 const char *model = "";
95
96 root = of_find_node_by_path("/");
97 if (root)
98 model = get_property(root, "model", NULL);
99 seq_printf(m, "machine\t\t: CHRP %s\n", model);
100 of_node_put(root);
101}
102
103/* Initialize firmware assisted non-maskable interrupts if
104 * the firmware supports this feature.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 */
106static void __init fwnmi_init(void)
107{
Michael Ellerman8c4f1f22005-12-04 18:39:33 +1100108 unsigned long system_reset_addr, machine_check_addr;
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 int ibm_nmi_register = rtas_token("ibm,nmi-register");
111 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
112 return;
Michael Ellerman8c4f1f22005-12-04 18:39:33 +1100113
114 /* If the kernel's not linked at zero we point the firmware at low
115 * addresses anyway, and use a trampoline to get to the real code. */
116 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
117 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
118
119 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
120 machine_check_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 fwnmi_active = 1;
122}
123
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000124void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc,
Benjamin Herrenschmidtb9e5b4e2006-07-03 19:32:51 +1000125 struct pt_regs *regs)
126{
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000127 unsigned int cascade_irq = i8259_irq(regs);
128 if (cascade_irq != NO_IRQ)
Benjamin Herrenschmidtb9e5b4e2006-07-03 19:32:51 +1000129 generic_handle_irq(cascade_irq, regs);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000130 desc->chip->eoi(irq);
Benjamin Herrenschmidtb9e5b4e2006-07-03 19:32:51 +1000131}
132
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000133static void __init pseries_mpic_init_IRQ(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000135 struct device_node *np, *old, *cascade = NULL;
Jeremy Kerr954a46e2006-07-12 15:39:43 +1000136 const unsigned int *addrp;
Paul Mackerrasf9bd1702005-10-26 16:47:42 +1000137 unsigned long intack = 0;
Jeremy Kerr954a46e2006-07-12 15:39:43 +1000138 const unsigned int *opprop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 unsigned long openpic_addr = 0;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000140 unsigned int cascade_irq;
141 int naddr, n, i, opplen;
142 struct mpic *mpic;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000144 np = of_find_node_by_path("/");
145 naddr = prom_n_addr_cells(np);
Jeremy Kerr954a46e2006-07-12 15:39:43 +1000146 opprop = get_property(np, "platform-open-pic", &opplen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 if (opprop != 0) {
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000148 openpic_addr = of_read_number(opprop, naddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
150 }
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000151 of_node_put(np);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153 BUG_ON(openpic_addr == 0);
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 /* Setup the openpic driver */
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000156 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
157 MPIC_PRIMARY,
158 16, 250, /* isu size, irq count */
159 " MPIC ");
160 BUG_ON(mpic == NULL);
161
162 /* Add ISUs */
163 opplen /= sizeof(u32);
164 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
165 unsigned long isuaddr = of_read_number(opprop + i, naddr);
166 mpic_assign_isu(mpic, n, isuaddr);
167 }
168
169 /* All ISUs are setup, complete initialization */
170 mpic_init(mpic);
171
172 /* Look for cascade */
173 for_each_node_by_type(np, "interrupt-controller")
174 if (device_is_compatible(np, "chrp,iic")) {
175 cascade = np;
176 break;
177 }
178 if (cascade == NULL)
179 return;
180
181 cascade_irq = irq_of_parse_and_map(cascade, 0);
182 if (cascade == NO_IRQ) {
183 printk(KERN_ERR "xics: failed to map cascade interrupt");
184 return;
185 }
186
187 /* Check ACK type */
188 for (old = of_node_get(cascade); old != NULL ; old = np) {
189 np = of_get_parent(old);
190 of_node_put(old);
191 if (np == NULL)
192 break;
193 if (strcmp(np->name, "pci") != 0)
194 continue;
Jeremy Kerr954a46e2006-07-12 15:39:43 +1000195 addrp = get_property(np, "8259-interrupt-acknowledge",
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000196 NULL);
197 if (addrp == NULL)
198 continue;
199 naddr = prom_n_addr_cells(np);
200 intack = addrp[naddr-1];
201 if (naddr > 1)
202 intack |= ((unsigned long)addrp[naddr-2]) << 32;
203 }
204 if (intack)
205 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
206 intack);
207 i8259_init(cascade, intack);
208 of_node_put(cascade);
209 set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210}
211
Michael Ellerman180a3362005-08-09 11:13:36 +1000212static void pseries_lpar_enable_pmcs(void)
213{
214 unsigned long set, reset;
215
Michael Ellerman180a3362005-08-09 11:13:36 +1000216 set = 1UL << 63;
217 reset = 0;
218 plpar_hcall_norets(H_PERFMON, set, reset);
219
220 /* instruct hypervisor to maintain PMCs */
221 if (firmware_has_feature(FW_FEATURE_SPLPAR))
David Gibson3356bb92006-01-13 10:26:42 +1100222 get_lppaca()->pmcregs_in_use = 1;
Michael Ellerman180a3362005-08-09 11:13:36 +1000223}
224
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000225#ifdef CONFIG_KEXEC
Michael Ellermanf50d4cf2006-08-24 16:54:08 +1000226static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000227{
228 /* Don't risk a hypervisor call if we're crashing */
229 if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
Michael Neuling2f6093c2006-08-07 16:19:19 +1000230 unsigned long addr;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000231
Michael Neuling2f6093c2006-08-07 16:19:19 +1000232 addr = __pa(get_slb_shadow());
233 if (unregister_slb_shadow(hard_smp_processor_id(), addr))
234 printk("SLB shadow buffer deregistration of "
235 "cpu %u (hw_cpu_id %d) failed\n",
236 smp_processor_id(),
237 hard_smp_processor_id());
238
239 addr = __pa(get_lppaca());
240 if (unregister_vpa(hard_smp_processor_id(), addr)) {
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000241 printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
242 "failed\n", smp_processor_id(),
243 hard_smp_processor_id());
244 }
245 }
Michael Ellermanf50d4cf2006-08-24 16:54:08 +1000246}
247
248static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
249{
250 pseries_kexec_cpu_down(crash_shutdown, secondary);
251 mpic_teardown_this_cpu(secondary);
252}
253
254static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
255{
256 pseries_kexec_cpu_down(crash_shutdown, secondary);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000257 xics_teardown_cpu(secondary);
258}
259#endif /* CONFIG_KEXEC */
260
261static void __init pseries_discover_pic(void)
262{
263 struct device_node *np;
Jeremy Kerr954a46e2006-07-12 15:39:43 +1000264 const char *typep;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000265
266 for (np = NULL; (np = of_find_node_by_name(np,
267 "interrupt-controller"));) {
Jeremy Kerr954a46e2006-07-12 15:39:43 +1000268 typep = get_property(np, "compatible", NULL);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000269 if (strstr(typep, "open-pic")) {
270 pSeries_mpic_node = of_node_get(np);
271 ppc_md.init_IRQ = pseries_mpic_init_IRQ;
272 ppc_md.get_irq = mpic_get_irq;
273#ifdef CONFIG_KEXEC
274 ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
275#endif
276#ifdef CONFIG_SMP
277 smp_init_pseries_mpic();
278#endif
279 return;
280 } else if (strstr(typep, "ppc-xicp")) {
281 ppc_md.init_IRQ = xics_init_IRQ;
282#ifdef CONFIG_KEXEC
283 ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
284#endif
285#ifdef CONFIG_SMP
286 smp_init_pseries_xics();
287#endif
288 return;
289 }
290 }
291 printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
292 " interrupt-controller\n");
293}
294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295static void __init pSeries_setup_arch(void)
296{
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000297 /* Discover PIC type and setup ppc_md accordingly */
298 pseries_discover_pic();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 /* openpic global configuration register (64-bit format). */
301 /* openpic Interrupt Source Unit pointer (64-bit format). */
302 /* python0 facility area (mmio) (64-bit format) REAL address. */
303
304 /* init to some ~sane value until calibrate_delay() runs */
305 loops_per_jiffy = 50000000;
306
307 if (ROOT_DEV == 0) {
308 printk("No ramdisk, default root is /dev/sda2\n");
309 ROOT_DEV = Root_SDA2;
310 }
311
312 fwnmi_init();
313
314 /* Find and initialize PCI host bridges */
315 init_pci_config_tokens();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 find_and_init_phbs();
Paul Mackerras0160f532005-09-13 20:56:20 +1000317 eeh_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 pSeries_nvram_init();
320
Michael Ellerman62d60e92005-07-07 17:56:30 -0700321 /* Choose an idle loop */
Stephen Rothwell1ababe12005-08-03 14:35:25 +1000322 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
Stephen Rothwell8d15a3e2005-08-03 14:40:16 +1000323 vpa_init(boot_cpuid);
David Gibson3356bb92006-01-13 10:26:42 +1100324 if (get_lppaca()->shared_proc) {
Olof Johansson4baaf0c2006-04-12 15:23:22 -0500325 printk(KERN_DEBUG "Using shared processor idle loop\n");
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100326 ppc_md.power_save = pseries_shared_idle_sleep;
Michael Ellerman62d60e92005-07-07 17:56:30 -0700327 } else {
Olof Johansson4baaf0c2006-04-12 15:23:22 -0500328 printk(KERN_DEBUG "Using dedicated idle loop\n");
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100329 ppc_md.power_save = pseries_dedicated_idle_sleep;
Michael Ellerman62d60e92005-07-07 17:56:30 -0700330 }
331 } else {
Olof Johansson4baaf0c2006-04-12 15:23:22 -0500332 printk(KERN_DEBUG "Using default idle loop\n");
Michael Ellerman62d60e92005-07-07 17:56:30 -0700333 }
Michael Ellerman180a3362005-08-09 11:13:36 +1000334
Michael Ellerman57cfb812006-03-21 20:45:59 +1100335 if (firmware_has_feature(FW_FEATURE_LPAR))
Michael Ellerman180a3362005-08-09 11:13:36 +1000336 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
337 else
338 ppc_md.enable_pmcs = power4_enable_pmcs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339}
340
341static int __init pSeries_init_panel(void)
342{
343 /* Manually leave the kernel version on the panel. */
344 ppc_md.progress("Linux ppc64\n", 0);
Anton Blanchard3de620e2006-05-10 13:05:54 +1000345 ppc_md.progress(system_utsname.release, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
347 return 0;
348}
349arch_initcall(pSeries_init_panel);
350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351static void pSeries_mach_cpu_die(void)
352{
353 local_irq_disable();
354 idle_task_exit();
Benjamin Herrenschmidtb9e5b4e2006-07-03 19:32:51 +1000355 xics_teardown_cpu(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 rtas_stop_self();
357 /* Should never get here... */
358 BUG();
359 for(;;);
360}
361
Michael Ellermancab0af92005-11-03 15:30:49 +1100362static int pseries_set_dabr(unsigned long dabr)
363{
Michael Ellerman76032de2005-11-07 13:12:03 +1100364 return plpar_hcall_norets(H_SET_DABR, dabr);
Michael Ellermancab0af92005-11-03 15:30:49 +1100365}
366
Michael Ellerman76032de2005-11-07 13:12:03 +1100367static int pseries_set_xdabr(unsigned long dabr)
368{
369 /* We want to catch accesses from kernel and userspace */
370 return plpar_hcall_norets(H_SET_XDABR, dabr,
371 H_DABRX_KERNEL | H_DABRX_USER);
372}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374/*
375 * Early initialization. Relocation is on but do not reference unbolted pages
376 */
377static void __init pSeries_init_early(void)
378{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 DBG(" -> pSeries_init_early()\n");
380
381 fw_feature_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Michael Ellerman57cfb812006-03-21 20:45:59 +1100383 if (firmware_has_feature(FW_FEATURE_LPAR))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 find_udbg_vterm();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Michael Ellerman76032de2005-11-07 13:12:03 +1100386 if (firmware_has_feature(FW_FEATURE_DABR))
Michael Ellermancab0af92005-11-03 15:30:49 +1100387 ppc_md.set_dabr = pseries_set_dabr;
Michael Ellerman76032de2005-11-07 13:12:03 +1100388 else if (firmware_has_feature(FW_FEATURE_XDABR))
389 ppc_md.set_dabr = pseries_set_xdabr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
391 iommu_init_early_pSeries();
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 DBG(" <- pSeries_init_early()\n");
394}
395
396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397static int pSeries_check_legacy_ioport(unsigned int baseport)
398{
399 struct device_node *np;
400
401#define I8042_DATA_REG 0x60
402#define FDC_BASE 0x3f0
403
404
405 switch(baseport) {
406 case I8042_DATA_REG:
407 np = of_find_node_by_type(NULL, "8042");
408 if (np == NULL)
409 return -ENODEV;
410 of_node_put(np);
411 break;
412 case FDC_BASE:
413 np = of_find_node_by_type(NULL, "fdc");
414 if (np == NULL)
415 return -ENODEV;
416 of_node_put(np);
417 break;
418 }
419 return 0;
420}
421
422/*
423 * Called very early, MMU is off, device-tree isn't unflattened
424 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100426static int __init pSeries_probe_hypertas(unsigned long node,
427 const char *uname, int depth,
428 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100430 if (depth != 1 ||
431 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
432 return 0;
433
434 if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
435 powerpc_firmware_features |= FW_FEATURE_LPAR;
436
Michael Ellerman7d0daae2006-06-23 18:16:38 +1000437 if (firmware_has_feature(FW_FEATURE_LPAR))
438 hpte_init_lpar();
439 else
440 hpte_init_native();
441
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100442 return 1;
443}
444
445static int __init pSeries_probe(void)
446{
Arnd Bergmann133dda12006-06-07 12:04:18 +1000447 unsigned long root = of_get_flat_dt_root();
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100448 char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
449 "device_type", NULL);
450 if (dtype == NULL)
451 return 0;
452 if (strcmp(dtype, "chrp"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 return 0;
454
Arnd Bergmann133dda12006-06-07 12:04:18 +1000455 /* Cell blades firmware claims to be chrp while it's not. Until this
456 * is fixed, we need to avoid those here.
457 */
458 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
459 of_flat_dt_is_compatible(root, "IBM,CBEA"))
460 return 0;
461
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100462 DBG("pSeries detected, looking for LPAR capability...\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100464 /* Now try to figure out if we are running on LPAR */
465 of_scan_flat_dt(pSeries_probe_hypertas, NULL);
466
467 DBG("Machine is%s LPAR !\n",
468 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
Michael Ellerman57cfb812006-03-21 20:45:59 +1100469
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 return 1;
471}
472
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100473
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700474DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
475
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100476static void pseries_dedicated_idle_sleep(void)
Paul Mackerras143a1de2005-10-19 23:11:21 +1000477{
Anton Blanchard050a0932005-07-07 17:56:33 -0700478 unsigned int cpu = smp_processor_id();
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700479 unsigned long start_snooze;
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700480
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100481 /*
482 * Indicate to the HV that we are idle. Now would be
483 * a good time to find other work to dispatch.
484 */
485 get_lppaca()->idle = 1;
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700486
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100487 /*
488 * We come in with interrupts disabled, and need_resched()
489 * has been checked recently. If we should poll for a little
490 * while, do so.
491 */
Anton Blanchard0ddd3e72006-09-22 20:30:14 +1000492 if (__get_cpu_var(smt_snooze_delay)) {
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100493 start_snooze = get_tb() +
Anton Blanchard0ddd3e72006-09-22 20:30:14 +1000494 __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100495 local_irq_enable();
496 set_thread_flag(TIF_POLLING_NRFLAG);
Anton Blanchard050a0932005-07-07 17:56:33 -0700497
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100498 while (get_tb() < start_snooze) {
499 if (need_resched() || cpu_is_offline(cpu))
500 goto out;
501 ppc64_runlatch_off();
502 HMT_low();
503 HMT_very_low();
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700504 }
505
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100506 HMT_medium();
507 clear_thread_flag(TIF_POLLING_NRFLAG);
508 smp_mb();
509 local_irq_disable();
510 if (need_resched() || cpu_is_offline(cpu))
511 goto out;
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700512 }
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100513
Anton Blanchard0ddd3e72006-09-22 20:30:14 +1000514 cede_processor();
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100515
516out:
517 HMT_medium();
518 get_lppaca()->idle = 0;
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700519}
520
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100521static void pseries_shared_idle_sleep(void)
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700522{
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100523 /*
524 * Indicate to the HV that we are idle. Now would be
525 * a good time to find other work to dispatch.
526 */
527 get_lppaca()->idle = 1;
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700528
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100529 /*
530 * Yield the processor to the hypervisor. We return if
531 * an external interrupt occurs (which are driven prior
532 * to returning here) or if a prod occurs from another
533 * processor. When returning here, external interrupts
534 * are enabled.
535 */
536 cede_processor();
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700537
Paul Mackerrasfbd77402006-03-27 15:06:20 +1100538 get_lppaca()->idle = 0;
Michael Ellermanc66d5dd2005-07-07 17:56:29 -0700539}
540
Paul Mackerras42672922005-09-12 17:17:36 +1000541static int pSeries_pci_probe_mode(struct pci_bus *bus)
542{
Michael Ellerman57cfb812006-03-21 20:45:59 +1100543 if (firmware_has_feature(FW_FEATURE_LPAR))
Paul Mackerras42672922005-09-12 17:17:36 +1000544 return PCI_PROBE_DEVTREE;
545 return PCI_PROBE_NORMAL;
546}
547
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100548define_machine(pseries) {
549 .name = "pSeries",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 .probe = pSeries_probe,
551 .setup_arch = pSeries_setup_arch,
552 .init_early = pSeries_init_early,
Paul Mackerras0dd194d2005-10-20 20:48:19 +1000553 .show_cpuinfo = pSeries_show_cpuinfo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 .log_error = pSeries_log_error,
555 .pcibios_fixup = pSeries_final_fixup,
Paul Mackerras42672922005-09-12 17:17:36 +1000556 .pci_probe_mode = pSeries_pci_probe_mode,
John Rosedad32bb2005-06-23 17:09:54 +1000557 .irq_bus_setup = pSeries_irq_bus_setup,
Paul Mackerrasf4fcbbe2005-11-03 14:41:19 +1100558 .restart = rtas_restart,
559 .power_off = rtas_power_off,
560 .halt = rtas_halt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 .panic = rtas_os_term,
562 .cpu_die = pSeries_mach_cpu_die,
Arnd Bergmann773bf9c2005-06-23 09:43:18 +1000563 .get_boot_time = rtas_get_boot_time,
564 .get_rtc_time = rtas_get_rtc_time,
565 .set_rtc_time = rtas_set_rtc_time,
Arnd Bergmann10f7e7c2005-06-23 09:43:07 +1000566 .calibrate_decr = generic_calibrate_decr,
Arnd Bergmann6566c6f2005-06-23 09:43:28 +1000567 .progress = rtas_progress,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 .check_legacy_ioport = pSeries_check_legacy_ioport,
569 .system_reset_exception = pSeries_system_reset_exception,
570 .machine_check_exception = pSeries_machine_check_exception,
Michael Ellermanc5e24352005-11-12 00:06:05 +1100571#ifdef CONFIG_KEXEC
Michael Ellerman3d1229d2005-11-14 23:35:00 +1100572 .machine_kexec = default_machine_kexec,
573 .machine_kexec_prepare = default_machine_kexec_prepare,
Michael Ellermancc532912005-12-04 18:39:43 +1100574 .machine_crash_shutdown = default_machine_crash_shutdown,
Michael Ellermanc5e24352005-11-12 00:06:05 +1100575#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576};