4 * Copyright 2011 IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
14 #include <linux/cpu.h>
15 #include <linux/errno.h>
16 #include <linux/sched.h>
17 #include <linux/kernel.h>
18 #include <linux/tty.h>
19 #include <linux/reboot.h>
20 #include <linux/init.h>
21 #include <linux/console.h>
22 #include <linux/delay.h>
23 #include <linux/irq.h>
24 #include <linux/seq_file.h>
26 #include <linux/of_fdt.h>
27 #include <linux/interrupt.h>
28 #include <linux/bug.h>
29 #include <linux/pci.h>
30 #include <linux/cpufreq.h>
32 #include <asm/machdep.h>
33 #include <asm/firmware.h>
37 #include <asm/kexec.h>
42 static void __init pnv_setup_arch(void)
44 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
52 /* Setup RTC and NVRAM callbacks */
53 if (firmware_has_feature(FW_FEATURE_OPAL))
62 static void __init pnv_init_early(void)
65 * Initialize the LPC bus now so that legacy serial
66 * ports can be found on it
70 #ifdef CONFIG_HVC_OPAL
71 if (firmware_has_feature(FW_FEATURE_OPAL))
72 hvc_opal_init_early();
75 add_preferred_console("hvc", 0, NULL);
78 static void __init pnv_init_IRQ(void)
82 WARN_ON(!ppc_md.get_irq);
85 static void pnv_show_cpuinfo(struct seq_file *m)
87 struct device_node *root;
88 const char *model = "";
90 root = of_find_node_by_path("/");
92 model = of_get_property(root, "model", NULL);
93 seq_printf(m, "machine\t\t: PowerNV %s\n", model);
94 if (firmware_has_feature(FW_FEATURE_OPALv3))
95 seq_printf(m, "firmware\t: OPAL v3\n");
96 else if (firmware_has_feature(FW_FEATURE_OPALv2))
97 seq_printf(m, "firmware\t: OPAL v2\n");
98 else if (firmware_has_feature(FW_FEATURE_OPAL))
99 seq_printf(m, "firmware\t: OPAL v1\n");
101 seq_printf(m, "firmware\t: BML\n");
105 static void pnv_prepare_going_down(void)
108 * Disable all notifiers from OPAL, we can't
109 * service interrupts anymore anyway
111 opal_notifier_disable();
113 /* Soft disable interrupts */
117 * Return secondary CPUs to firwmare if a flash update
118 * is pending otherwise we will get all sort of error
119 * messages about CPU being stuck etc.. This will also
120 * have the side effect of hard disabling interrupts so
121 * past this point, the kernel is effectively dead.
123 opal_flash_term_callback();
126 static void __noreturn pnv_restart(char *cmd)
130 pnv_prepare_going_down();
132 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
133 rc = opal_cec_reboot();
134 if (rc == OPAL_BUSY_EVENT)
135 opal_poll_events(NULL);
140 opal_poll_events(NULL);
143 static void __noreturn pnv_power_off(void)
147 pnv_prepare_going_down();
149 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
150 rc = opal_cec_power_down(0);
151 if (rc == OPAL_BUSY_EVENT)
152 opal_poll_events(NULL);
157 opal_poll_events(NULL);
160 static void __noreturn pnv_halt(void)
165 static void pnv_progress(char *s, unsigned short hex)
169 static int pnv_dma_set_mask(struct device *dev, u64 dma_mask)
172 return pnv_pci_dma_set_mask(to_pci_dev(dev), dma_mask);
173 return __dma_set_mask(dev, dma_mask);
176 static u64 pnv_dma_get_required_mask(struct device *dev)
179 return pnv_pci_dma_get_required_mask(to_pci_dev(dev));
181 return __dma_get_required_mask(dev);
184 static void pnv_shutdown(void)
186 /* Let the PCI code clear up IODA tables */
190 * Stop OPAL activity: Unregister all OPAL interrupts so they
191 * don't fire up while we kexec and make sure all potentially
192 * DMA'ing ops are complete (such as dump retrieval).
198 static void pnv_kexec_wait_secondaries_down(void)
200 int my_cpu, i, notified = -1;
204 for_each_online_cpu(i) {
212 rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
214 if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
218 printk(KERN_INFO "kexec: waiting for cpu %d "
219 "(physical %d) to enter OPAL\n",
220 i, paca[i].hw_cpu_id);
227 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
229 xics_kexec_teardown_cpu(secondary);
231 /* On OPAL v3, we return all CPUs to firmware */
233 if (!firmware_has_feature(FW_FEATURE_OPALv3))
237 /* Return secondary CPUs to firmware on OPAL v3 */
239 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
242 /* Return the CPU to OPAL */
244 } else if (crash_shutdown) {
246 * On crash, we don't wait for secondaries to go
247 * down as they might be unreachable or hung, so
248 * instead we just wait a bit and move on.
252 /* Primary waits for the secondaries to have reached OPAL */
253 pnv_kexec_wait_secondaries_down();
256 #endif /* CONFIG_KEXEC */
258 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
259 static unsigned long pnv_memory_block_size(void)
261 return 256UL * 1024 * 1024;
265 static void __init pnv_setup_machdep_opal(void)
267 ppc_md.get_boot_time = opal_get_boot_time;
268 ppc_md.restart = pnv_restart;
269 pm_power_off = pnv_power_off;
270 ppc_md.halt = pnv_halt;
271 ppc_md.machine_check_exception = opal_machine_check;
272 ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
273 ppc_md.hmi_exception_early = opal_hmi_exception_early;
274 ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
277 #ifdef CONFIG_PPC_POWERNV_RTAS
278 static void __init pnv_setup_machdep_rtas(void)
280 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
281 ppc_md.get_boot_time = rtas_get_boot_time;
282 ppc_md.get_rtc_time = rtas_get_rtc_time;
283 ppc_md.set_rtc_time = rtas_set_rtc_time;
285 ppc_md.restart = rtas_restart;
286 pm_power_off = rtas_power_off;
287 ppc_md.halt = rtas_halt;
289 #endif /* CONFIG_PPC_POWERNV_RTAS */
291 static int __init pnv_probe(void)
293 unsigned long root = of_get_flat_dt_root();
295 if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
300 if (firmware_has_feature(FW_FEATURE_OPAL))
301 pnv_setup_machdep_opal();
302 #ifdef CONFIG_PPC_POWERNV_RTAS
304 pnv_setup_machdep_rtas();
305 #endif /* CONFIG_PPC_POWERNV_RTAS */
307 pr_debug("PowerNV detected !\n");
313 * Returns the cpu frequency for 'cpu' in Hz. This is used by
316 static unsigned long pnv_get_proc_freq(unsigned int cpu)
318 unsigned long ret_freq;
320 ret_freq = cpufreq_quick_get(cpu) * 1000ul;
323 * If the backend cpufreq driver does not exist,
324 * then fallback to old way of reporting the clockrate.
327 ret_freq = ppc_proc_freq;
331 define_machine(powernv) {
334 .init_early = pnv_init_early,
335 .setup_arch = pnv_setup_arch,
336 .init_IRQ = pnv_init_IRQ,
337 .show_cpuinfo = pnv_show_cpuinfo,
338 .get_proc_freq = pnv_get_proc_freq,
339 .progress = pnv_progress,
340 .machine_shutdown = pnv_shutdown,
341 .power_save = power7_idle,
342 .calibrate_decr = generic_calibrate_decr,
343 .dma_set_mask = pnv_dma_set_mask,
344 .dma_get_required_mask = pnv_dma_get_required_mask,
346 .kexec_cpu_down = pnv_kexec_cpu_down,
348 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
349 .memory_block_size = pnv_memory_block_size,