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>
41 static void __init pnv_setup_arch(void)
49 /* Setup RTC and NVRAM callbacks */
50 if (firmware_has_feature(FW_FEATURE_OPAL))
59 static void __init pnv_init_early(void)
62 * Initialize the LPC bus now so that legacy serial
63 * ports can be found on it
67 #ifdef CONFIG_HVC_OPAL
68 if (firmware_has_feature(FW_FEATURE_OPAL))
69 hvc_opal_init_early();
72 add_preferred_console("hvc", 0, NULL);
75 static void __init pnv_init_IRQ(void)
79 WARN_ON(!ppc_md.get_irq);
82 static void pnv_show_cpuinfo(struct seq_file *m)
84 struct device_node *root;
85 const char *model = "";
87 root = of_find_node_by_path("/");
89 model = of_get_property(root, "model", NULL);
90 seq_printf(m, "machine\t\t: PowerNV %s\n", model);
91 if (firmware_has_feature(FW_FEATURE_OPALv3))
92 seq_printf(m, "firmware\t: OPAL v3\n");
93 else if (firmware_has_feature(FW_FEATURE_OPALv2))
94 seq_printf(m, "firmware\t: OPAL v2\n");
95 else if (firmware_has_feature(FW_FEATURE_OPAL))
96 seq_printf(m, "firmware\t: OPAL v1\n");
98 seq_printf(m, "firmware\t: BML\n");
102 static void pnv_prepare_going_down(void)
105 * Disable all notifiers from OPAL, we can't
106 * service interrupts anymore anyway
108 opal_notifier_disable();
110 /* Soft disable interrupts */
114 * Return secondary CPUs to firwmare if a flash update
115 * is pending otherwise we will get all sort of error
116 * messages about CPU being stuck etc.. This will also
117 * have the side effect of hard disabling interrupts so
118 * past this point, the kernel is effectively dead.
120 opal_flash_term_callback();
123 static void __noreturn pnv_restart(char *cmd)
127 pnv_prepare_going_down();
129 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
130 rc = opal_cec_reboot();
131 if (rc == OPAL_BUSY_EVENT)
132 opal_poll_events(NULL);
137 opal_poll_events(NULL);
140 static void __noreturn pnv_power_off(void)
144 pnv_prepare_going_down();
146 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
147 rc = opal_cec_power_down(0);
148 if (rc == OPAL_BUSY_EVENT)
149 opal_poll_events(NULL);
154 opal_poll_events(NULL);
157 static void __noreturn pnv_halt(void)
162 static void pnv_progress(char *s, unsigned short hex)
166 static int pnv_dma_set_mask(struct device *dev, u64 dma_mask)
169 return pnv_pci_dma_set_mask(to_pci_dev(dev), dma_mask);
170 return __dma_set_mask(dev, dma_mask);
173 static void pnv_shutdown(void)
175 /* Let the PCI code clear up IODA tables */
179 * Stop OPAL activity: Unregister all OPAL interrupts so they
180 * don't fire up while we kexec and make sure all potentially
181 * DMA'ing ops are complete (such as dump retrieval).
187 static void pnv_kexec_wait_secondaries_down(void)
189 int my_cpu, i, notified = -1;
193 for_each_online_cpu(i) {
201 rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
203 if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
207 printk(KERN_INFO "kexec: waiting for cpu %d "
208 "(physical %d) to enter OPAL\n",
209 i, paca[i].hw_cpu_id);
216 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
218 xics_kexec_teardown_cpu(secondary);
220 /* On OPAL v3, we return all CPUs to firmware */
222 if (!firmware_has_feature(FW_FEATURE_OPALv3))
226 /* Return secondary CPUs to firmware on OPAL v3 */
228 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
231 /* Return the CPU to OPAL */
233 } else if (crash_shutdown) {
235 * On crash, we don't wait for secondaries to go
236 * down as they might be unreachable or hung, so
237 * instead we just wait a bit and move on.
241 /* Primary waits for the secondaries to have reached OPAL */
242 pnv_kexec_wait_secondaries_down();
245 #endif /* CONFIG_KEXEC */
247 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
248 static unsigned long pnv_memory_block_size(void)
250 return 256UL * 1024 * 1024;
254 static void __init pnv_setup_machdep_opal(void)
256 ppc_md.get_boot_time = opal_get_boot_time;
257 ppc_md.get_rtc_time = opal_get_rtc_time;
258 ppc_md.set_rtc_time = opal_set_rtc_time;
259 ppc_md.restart = pnv_restart;
260 ppc_md.power_off = pnv_power_off;
261 ppc_md.halt = pnv_halt;
262 ppc_md.machine_check_exception = opal_machine_check;
263 ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
266 #ifdef CONFIG_PPC_POWERNV_RTAS
267 static void __init pnv_setup_machdep_rtas(void)
269 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
270 ppc_md.get_boot_time = rtas_get_boot_time;
271 ppc_md.get_rtc_time = rtas_get_rtc_time;
272 ppc_md.set_rtc_time = rtas_set_rtc_time;
274 ppc_md.restart = rtas_restart;
275 ppc_md.power_off = rtas_power_off;
276 ppc_md.halt = rtas_halt;
278 #endif /* CONFIG_PPC_POWERNV_RTAS */
280 static int __init pnv_probe(void)
282 unsigned long root = of_get_flat_dt_root();
284 if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
289 if (firmware_has_feature(FW_FEATURE_OPAL))
290 pnv_setup_machdep_opal();
291 #ifdef CONFIG_PPC_POWERNV_RTAS
293 pnv_setup_machdep_rtas();
294 #endif /* CONFIG_PPC_POWERNV_RTAS */
296 pr_debug("PowerNV detected !\n");
302 * Returns the cpu frequency for 'cpu' in Hz. This is used by
305 unsigned long pnv_get_proc_freq(unsigned int cpu)
307 unsigned long ret_freq;
309 ret_freq = cpufreq_quick_get(cpu) * 1000ul;
312 * If the backend cpufreq driver does not exist,
313 * then fallback to old way of reporting the clockrate.
316 ret_freq = ppc_proc_freq;
320 define_machine(powernv) {
323 .init_early = pnv_init_early,
324 .setup_arch = pnv_setup_arch,
325 .init_IRQ = pnv_init_IRQ,
326 .show_cpuinfo = pnv_show_cpuinfo,
327 .get_proc_freq = pnv_get_proc_freq,
328 .progress = pnv_progress,
329 .machine_shutdown = pnv_shutdown,
330 .power_save = power7_idle,
331 .calibrate_decr = generic_calibrate_decr,
332 .dma_set_mask = pnv_dma_set_mask,
334 .kexec_cpu_down = pnv_kexec_cpu_down,
336 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
337 .memory_block_size = pnv_memory_block_size,