2 * linux/arch/ppc/kernel/setup.c
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/config.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/version.h>
40 #include <linux/adb.h>
41 #include <linux/module.h>
42 #include <linux/delay.h>
44 #include <linux/irq.h>
45 #include <linux/seq_file.h>
46 #include <linux/root_dev.h>
49 #include <asm/processor.h>
51 #include <asm/pgtable.h>
54 #include <asm/pci-bridge.h>
55 #include <asm/iommu.h>
57 #include <asm/machdep.h>
61 #include <asm/nvram.h>
65 #include <asm/ppcdebug.h>
66 #include <asm/cputable.h>
71 #define DBG(fmt...) udbg_printf(fmt)
76 extern void find_and_init_phbs(void);
77 extern void pSeries_final_fixup(void);
79 extern void pSeries_get_boot_time(struct rtc_time *rtc_time);
80 extern void pSeries_get_rtc_time(struct rtc_time *rtc_time);
81 extern int pSeries_set_rtc_time(struct rtc_time *rtc_time);
82 extern void find_udbg_vterm(void);
83 extern void SystemReset_FWNMI(void), MachineCheck_FWNMI(void); /* from head.S */
84 extern void generic_find_legacy_serial_ports(unsigned int *default_speed);
86 int fwnmi_active; /* TRUE if an FWNMI handler is present */
88 unsigned long virtPython0Facilities = 0; // python0 facility area (memory mapped io) (64-bit format) VIRTUAL address.
90 extern unsigned long loops_per_jiffy;
92 extern unsigned long ppc_proc_freq;
93 extern unsigned long ppc_tb_freq;
95 static volatile void __iomem * chrp_int_ack_special;
96 struct mpic *pSeries_mpic;
98 void pSeries_get_cpuinfo(struct seq_file *m)
100 struct device_node *root;
101 const char *model = "";
103 root = of_find_node_by_path("/");
105 model = get_property(root, "model", NULL);
106 seq_printf(m, "machine\t\t: CHRP %s\n", model);
110 /* Initialize firmware assisted non-maskable interrupts if
111 * the firmware supports this feature.
114 static void __init fwnmi_init(void)
117 int ibm_nmi_register = rtas_token("ibm,nmi-register");
118 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
120 ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
121 __pa((unsigned long)SystemReset_FWNMI),
122 __pa((unsigned long)MachineCheck_FWNMI));
127 static int pSeries_irq_cascade(struct pt_regs *regs, void *data)
129 if (chrp_int_ack_special)
130 return readb(chrp_int_ack_special);
132 return i8259_irq(smp_processor_id());
135 static void __init pSeries_init_mpic(void)
138 struct device_node *np;
141 /* All ISUs are setup, complete initialization */
142 mpic_init(pSeries_mpic);
144 /* Check what kind of cascade ACK we have */
145 if (!(np = of_find_node_by_name(NULL, "pci"))
146 || !(addrp = (unsigned int *)
147 get_property(np, "8259-interrupt-acknowledge", NULL)))
148 printk(KERN_ERR "Cannot find pci to get ack address\n");
150 chrp_int_ack_special = ioremap(addrp[prom_n_addr_cells(np)-1], 1);
153 /* Setup the legacy interrupts & controller */
154 for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
155 irq_desc[i].handler = &i8259_pic;
158 /* Hook cascade to mpic */
159 mpic_setup_cascade(NUM_ISA_INTERRUPTS, pSeries_irq_cascade, NULL);
162 static void __init pSeries_setup_mpic(void)
164 unsigned int *opprop;
165 unsigned long openpic_addr = 0;
166 unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
167 struct device_node *root;
170 /* Find the Open PIC if present */
171 root = of_find_node_by_path("/");
172 opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
174 int n = prom_n_addr_cells(root);
176 for (openpic_addr = 0; n > 0; --n)
177 openpic_addr = (openpic_addr << 32) + *opprop++;
178 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
182 BUG_ON(openpic_addr == 0);
184 /* Get the sense values from OF */
185 prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
187 /* Setup the openpic driver */
188 irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
189 pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
190 16, 16, irq_count, /* isu size, irq offset, irq count */
191 NR_IRQS - 4, /* ipi offset */
192 senses, irq_count, /* sense & sense size */
196 static void __init pSeries_setup_arch(void)
198 /* Fixup ppc_md depending on the type of interrupt controller */
199 if (naca->interrupt_controller == IC_OPEN_PIC) {
200 ppc_md.init_IRQ = pSeries_init_mpic;
201 ppc_md.get_irq = mpic_get_irq;
202 /* Allocate the mpic now, so that find_and_init_phbs() can
204 pSeries_setup_mpic();
206 ppc_md.init_IRQ = xics_init_IRQ;
207 ppc_md.get_irq = xics_get_irq;
213 /* openpic global configuration register (64-bit format). */
214 /* openpic Interrupt Source Unit pointer (64-bit format). */
215 /* python0 facility area (mmio) (64-bit format) REAL address. */
217 /* init to some ~sane value until calibrate_delay() runs */
218 loops_per_jiffy = 50000000;
221 printk("No ramdisk, default root is /dev/sda2\n");
222 ROOT_DEV = Root_SDA2;
227 /* Find and initialize PCI host bridges */
228 /* iSeries needs to be done much later. */
230 find_and_init_phbs();
232 #ifdef CONFIG_DUMMY_CONSOLE
233 conswitchp = &dummy_con;
236 pSeries_nvram_init();
238 if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR)
239 vpa_init(boot_cpuid);
242 static int __init pSeries_init_panel(void)
244 /* Manually leave the kernel version on the panel. */
245 ppc_md.progress("Linux ppc64\n", 0);
246 ppc_md.progress(UTS_RELEASE, 0);
250 arch_initcall(pSeries_init_panel);
253 /* Build up the firmware_features bitmask field
254 * using contents of device-tree/ibm,hypertas-functions.
255 * Ultimately this functionality may be moved into prom.c prom_init().
257 void __init fw_feature_init(void)
259 struct device_node * dn;
263 DBG(" -> fw_feature_init()\n");
265 cur_cpu_spec->firmware_features = 0;
266 dn = of_find_node_by_path("/rtas");
268 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
272 hypertas = get_property(dn, "ibm,hypertas-functions", &len);
276 /* check value against table of strings */
277 for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
278 if ((firmware_features_table[i].name) &&
279 (strcmp(firmware_features_table[i].name,hypertas))==0) {
280 /* we have a match */
281 cur_cpu_spec->firmware_features |=
282 (firmware_features_table[i].val);
286 hypertas_len = strlen(hypertas);
287 len -= hypertas_len +1;
288 hypertas+= hypertas_len +1;
294 printk(KERN_INFO "firmware_features = 0x%lx\n",
295 cur_cpu_spec->firmware_features);
297 DBG(" <- fw_feature_init()\n");
301 static void __init pSeries_discover_pic(void)
303 struct device_node *np;
307 * Setup interrupt mapping options that are needed for finish_device_tree
308 * to properly parse the OF interrupt tree & do the virtual irq mapping
310 __irq_offset_value = NUM_ISA_INTERRUPTS;
311 naca->interrupt_controller = IC_INVALID;
312 for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
313 typep = (char *)get_property(np, "compatible", NULL);
314 if (strstr(typep, "open-pic"))
315 naca->interrupt_controller = IC_OPEN_PIC;
316 else if (strstr(typep, "ppc-xicp"))
317 naca->interrupt_controller = IC_PPC_XIC;
319 printk("initialize_naca: failed to recognize"
320 " interrupt-controller\n");
325 static void pSeries_cpu_die(void)
328 /* Some hardware requires clearing the CPPR, while other hardware does not
329 * it is safe either way
331 pSeriesLP_cppr_info(0, 0);
333 /* Should never get here... */
340 * Early initialization. Relocation is on but do not reference unbolted pages
342 static void __init pSeries_init_early(void)
346 unsigned int default_speed;
348 DBG(" -> pSeries_init_early()\n");
352 if (systemcfg->platform & PLATFORM_LPAR)
356 iommu_off = (of_chosen &&
357 get_property(of_chosen, "linux,iommu-off", NULL));
360 generic_find_legacy_serial_ports(&default_speed);
362 if (systemcfg->platform & PLATFORM_LPAR)
364 else if (naca->serialPortAddr) {
365 /* Map the uart for udbg. */
366 comport = (void *)__ioremap(naca->serialPortAddr, 16, _PAGE_NO_CACHE);
367 udbg_init_uart(comport, default_speed);
369 ppc_md.udbg_putc = udbg_putc;
370 ppc_md.udbg_getc = udbg_getc;
371 ppc_md.udbg_getc_poll = udbg_getc_poll;
372 DBG("Hello World !\n");
377 pci_dma_init_direct();
381 pSeries_discover_pic();
383 DBG(" <- pSeries_init_early()\n");
387 static void pSeries_progress(char *s, unsigned short hex)
389 struct device_node *root;
392 static int display_character, set_indicator;
393 static int max_width;
394 static spinlock_t progress_lock = SPIN_LOCK_UNLOCKED;
395 static int pending_newline = 0; /* did last write end with unprinted newline? */
400 if (max_width == 0) {
401 if ((root = find_path_device("/rtas")) &&
402 (p = (unsigned int *)get_property(root,
403 "ibm,display-line-length",
408 display_character = rtas_token("display-character");
409 set_indicator = rtas_token("set-indicator");
412 if (display_character == RTAS_UNKNOWN_SERVICE) {
413 /* use hex display if available */
414 if (set_indicator != RTAS_UNKNOWN_SERVICE)
415 rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
419 spin_lock(&progress_lock);
422 * Last write ended with newline, but we didn't print it since
423 * it would just clear the bottom line of output. Print it now
426 * If no newline is pending, print a CR to start output at the
427 * beginning of the line.
429 if (pending_newline) {
430 rtas_call(display_character, 1, 1, NULL, '\r');
431 rtas_call(display_character, 1, 1, NULL, '\n');
434 rtas_call(display_character, 1, 1, NULL, '\r');
440 if (*os == '\n' || *os == '\r') {
441 /* Blank to end of line. */
443 rtas_call(display_character, 1, 1, NULL, ' ');
445 /* If newline is the last character, save it
446 * until next call to avoid bumping up the
449 if (*os == '\n' && !os[1]) {
451 spin_unlock(&progress_lock);
455 /* RTAS wants CR-LF, not just LF */
458 rtas_call(display_character, 1, 1, NULL, '\r');
459 rtas_call(display_character, 1, 1, NULL, '\n');
461 /* CR might be used to re-draw a line, so we'll
462 * leave it alone and not add LF.
464 rtas_call(display_character, 1, 1, NULL, *os);
470 rtas_call(display_character, 1, 1, NULL, *os);
475 /* if we overwrite the screen length */
477 while ((*os != 0) && (*os != '\n') && (*os != '\r'))
481 /* Blank to end of line. */
483 rtas_call(display_character, 1, 1, NULL, ' ');
485 spin_unlock(&progress_lock);
488 extern void setup_default_decr(void);
490 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
491 #define DEFAULT_TB_FREQ 125000000UL
492 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
494 static void __init pSeries_calibrate_decr(void)
496 struct device_node *cpu;
497 struct div_result divres;
502 * The cpu node should have a timebase-frequency property
503 * to tell us the rate at which the decrementer counts.
505 cpu = of_find_node_by_type(NULL, "cpu");
507 ppc_tb_freq = DEFAULT_TB_FREQ; /* hardcoded default */
510 fp = (unsigned int *)get_property(cpu, "timebase-frequency",
518 printk(KERN_ERR "WARNING: Estimating decrementer frequency "
521 ppc_proc_freq = DEFAULT_PROC_FREQ;
524 fp = (unsigned int *)get_property(cpu, "clock-frequency",
532 printk(KERN_ERR "WARNING: Estimating processor frequency "
537 printk(KERN_INFO "time_init: decrementer frequency = %lu.%.6lu MHz\n",
538 ppc_tb_freq/1000000, ppc_tb_freq%1000000);
539 printk(KERN_INFO "time_init: processor frequency = %lu.%.6lu MHz\n",
540 ppc_proc_freq/1000000, ppc_proc_freq%1000000);
542 tb_ticks_per_jiffy = ppc_tb_freq / HZ;
543 tb_ticks_per_sec = tb_ticks_per_jiffy * HZ;
544 tb_ticks_per_usec = ppc_tb_freq / 1000000;
545 tb_to_us = mulhwu_scale_factor(ppc_tb_freq, 1000000);
546 div128_by_32(1024*1024, 0, tb_ticks_per_sec, &divres);
547 tb_to_xs = divres.result_low;
549 setup_default_decr();
552 static int pSeries_check_legacy_ioport(unsigned int baseport)
554 struct device_node *np;
556 #define I8042_DATA_REG 0x60
557 #define FDC_BASE 0x3f0
562 np = of_find_node_by_type(NULL, "8042");
568 np = of_find_node_by_type(NULL, "fdc");
578 * Called very early, MMU is off, device-tree isn't unflattened
580 extern struct machdep_calls pSeries_md;
582 static int __init pSeries_probe(int platform)
584 if (platform != PLATFORM_PSERIES &&
585 platform != PLATFORM_PSERIES_LPAR)
588 /* if we have some ppc_md fixups for LPAR to do, do
595 struct machdep_calls __initdata pSeries_md = {
596 .probe = pSeries_probe,
597 .setup_arch = pSeries_setup_arch,
598 .init_early = pSeries_init_early,
599 .get_cpuinfo = pSeries_get_cpuinfo,
600 .log_error = pSeries_log_error,
601 .pcibios_fixup = pSeries_final_fixup,
602 .restart = rtas_restart,
603 .power_off = rtas_power_off,
605 .panic = rtas_os_term,
606 .cpu_die = pSeries_cpu_die,
607 .get_boot_time = pSeries_get_boot_time,
608 .get_rtc_time = pSeries_get_rtc_time,
609 .set_rtc_time = pSeries_set_rtc_time,
610 .calibrate_decr = pSeries_calibrate_decr,
611 .progress = pSeries_progress,
612 .check_legacy_ioport = pSeries_check_legacy_ioport,