2 * Copyright (C) 1995 Linus Torvalds
3 * Adapted from 'alpha' version by Gary Thomas
4 * Modified by Cort Dougan (cort@cs.nmt.edu)
11 #include <linux/errno.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
15 #include <linux/stddef.h>
16 #include <linux/unistd.h>
17 #include <linux/ptrace.h>
18 #include <linux/slab.h>
19 #include <linux/user.h>
20 #include <linux/a.out.h>
21 #include <linux/tty.h>
22 #include <linux/major.h>
23 #include <linux/interrupt.h>
24 #include <linux/reboot.h>
25 #include <linux/init.h>
26 #include <linux/pci.h>
27 #include <linux/utsrelease.h>
28 #include <linux/adb.h>
29 #include <linux/module.h>
30 #include <linux/delay.h>
31 #include <linux/ide.h>
32 #include <linux/console.h>
33 #include <linux/seq_file.h>
34 #include <linux/root_dev.h>
35 #include <linux/initrd.h>
36 #include <linux/module.h>
37 #include <linux/timer.h>
40 #include <asm/pgtable.h>
43 #include <asm/pci-bridge.h>
45 #include <asm/machdep.h>
47 #include <asm/hydra.h>
48 #include <asm/sections.h>
50 #include <asm/i8259.h>
57 void rtas_indicator_progress(char *, unsigned short);
60 EXPORT_SYMBOL(_chrp_type);
62 static struct mpic *chrp_mpic;
64 /* Used for doing CHRP event-scans */
65 DEFINE_PER_CPU(struct timer_list, heartbeat_timer);
66 unsigned long event_scan_interval;
69 * XXX this should be in xmon.h, but putting it there means xmon.h
70 * has to include <linux/interrupt.h> (to get irqreturn_t), which
71 * causes all sorts of problems. -- paulus
73 extern irqreturn_t xmon_irq(int, void *);
75 extern unsigned long loops_per_jiffy;
77 /* To be replaced by RTAS when available */
78 static unsigned int *briq_SPOR;
81 extern struct smp_ops_t chrp_smp_ops;
84 static const char *gg2_memtypes[4] = {
85 "FPM", "SDRAM", "EDO", "BEDO"
87 static const char *gg2_cachesizes[4] = {
88 "256 KB", "512 KB", "1 MB", "Reserved"
90 static const char *gg2_cachetypes[4] = {
91 "Asynchronous", "Reserved", "Flow-Through Synchronous",
92 "Pipelined Synchronous"
94 static const char *gg2_cachemodes[4] = {
95 "Disabled", "Write-Through", "Copy-Back", "Transparent Mode"
98 static const char *chrp_names[] = {
107 void chrp_show_cpuinfo(struct seq_file *m)
111 struct device_node *root;
112 const char *model = "";
114 root = find_path_device("/");
116 model = get_property(root, "model", NULL);
117 seq_printf(m, "machine\t\t: CHRP %s\n", model);
119 /* longtrail (goldengate) stuff */
120 if (!strncmp(model, "IBM,LongTrail", 13)) {
121 /* VLSI VAS96011/12 `Golden Gate 2' */
123 sdramen = (in_le32(gg2_pci_config_base + GG2_PCI_DRAM_CTRL)
125 for (i = 0; i < (sdramen ? 4 : 6); i++) {
126 t = in_le32(gg2_pci_config_base+
131 switch ((t>>8) & 0x1f) {
154 seq_printf(m, "memory bank %d\t: %s %s\n", i, model,
155 gg2_memtypes[sdramen ? 1 : ((t>>1) & 3)]);
158 t = in_le32(gg2_pci_config_base+GG2_PCI_CC_CTRL);
159 seq_printf(m, "board l2\t: %s %s (%s)\n",
160 gg2_cachesizes[(t>>7) & 3],
161 gg2_cachetypes[(t>>2) & 3],
162 gg2_cachemodes[t & 3]);
167 * Fixes for the National Semiconductor PC78308VUL SuperI/O
169 * Some versions of Open Firmware incorrectly initialize the IRQ settings
170 * for keyboard and mouse
172 static inline void __init sio_write(u8 val, u8 index)
178 static inline u8 __init sio_read(u8 index)
184 static void __init sio_fixup_irq(const char *name, u8 device, u8 level,
187 u8 level0, type0, active;
189 /* select logical device */
190 sio_write(device, 0x07);
191 active = sio_read(0x30);
192 level0 = sio_read(0x70);
193 type0 = sio_read(0x71);
194 if (level0 != level || type0 != type || !active) {
195 printk(KERN_WARNING "sio: %s irq level %d, type %d, %sactive: "
196 "remapping to level %d, type %d, active\n",
197 name, level0, type0, !active ? "in" : "", level, type);
198 sio_write(0x01, 0x30);
199 sio_write(level, 0x70);
200 sio_write(type, 0x71);
204 static void __init sio_init(void)
206 struct device_node *root;
208 if ((root = find_path_device("/")) &&
209 !strncmp(get_property(root, "model", NULL), "IBM,LongTrail", 13)) {
210 /* logical device 0 (KBC/Keyboard) */
211 sio_fixup_irq("keyboard", 0, 1, 2);
212 /* select logical device 1 (KBC/Mouse) */
213 sio_fixup_irq("mouse", 1, 12, 2);
218 static void __init pegasos_set_l2cr(void)
220 struct device_node *np;
222 /* On Pegasos, enable the l2 cache if needed, as the OF forgets it */
223 if (_chrp_type != _CHRP_Pegasos)
226 /* Enable L2 cache if needed */
227 np = find_type_devices("cpu");
229 const unsigned int *l2cr = get_property(np, "l2cr", NULL);
231 printk ("Pegasos l2cr : no cpu l2cr property found\n");
234 if (!((*l2cr) & 0x80000000)) {
235 printk ("Pegasos l2cr : L2 cache was not active, "
238 _set_L2CR((*l2cr) | 0x80000000);
243 static void briq_restart(char *cmd)
247 out_be32(briq_SPOR, 0);
251 void __init chrp_setup_arch(void)
253 struct device_node *root = find_path_device ("/");
254 const char *machine = NULL;
256 /* init to some ~sane value until calibrate_delay() runs */
257 loops_per_jiffy = 50000000/HZ;
260 machine = get_property(root, "model", NULL);
261 if (machine && strncmp(machine, "Pegasos", 7) == 0) {
262 _chrp_type = _CHRP_Pegasos;
263 } else if (machine && strncmp(machine, "IBM", 3) == 0) {
264 _chrp_type = _CHRP_IBM;
265 } else if (machine && strncmp(machine, "MOT", 3) == 0) {
266 _chrp_type = _CHRP_Motorola;
267 } else if (machine && strncmp(machine, "TotalImpact,BRIQ-1", 18) == 0) {
268 _chrp_type = _CHRP_briq;
269 /* Map the SPOR register on briq and change the restart hook */
270 briq_SPOR = (unsigned int *)ioremap(0xff0000e8, 4);
271 ppc_md.restart = briq_restart;
273 /* Let's assume it is an IBM chrp if all else fails */
274 _chrp_type = _CHRP_IBM;
276 printk("chrp type = %x [%s]\n", _chrp_type, chrp_names[_chrp_type]);
279 if (rtas_token("display-character") >= 0)
280 ppc_md.progress = rtas_progress;
282 /* use RTAS time-of-day routines if available */
283 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
284 ppc_md.get_boot_time = rtas_get_boot_time;
285 ppc_md.get_rtc_time = rtas_get_rtc_time;
286 ppc_md.set_rtc_time = rtas_set_rtc_time;
289 #ifdef CONFIG_BLK_DEV_INITRD
290 /* this is fine for chrp */
291 initrd_below_start_ok = 1;
294 ROOT_DEV = Root_RAM0;
297 ROOT_DEV = Root_SDA2; /* sda2 (sda1 is for the kernel) */
299 /* On pegasos, enable the L2 cache if not already done by OF */
302 /* Lookup PCI host bridges */
306 * Temporary fixes for PCI devices.
309 hydra_init(); /* Mac I/O */
312 * Fix the Super I/O configuration
316 pci_create_OF_bus_map();
319 * Print the banner, then scroll down so boot progress
320 * can be printed. -- Cort
322 if (ppc_md.progress) ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0x0);
326 chrp_event_scan(unsigned long unused)
328 unsigned char log[1024];
331 /* XXX: we should loop until the hardware says no more error logs -- Cort */
332 rtas_call(rtas_token("event-scan"), 4, 1, &ret, 0xffffffff, 0,
334 mod_timer(&__get_cpu_var(heartbeat_timer),
335 jiffies + event_scan_interval);
338 static void chrp_8259_cascade(unsigned int irq, struct irq_desc *desc)
340 unsigned int cascade_irq = i8259_irq();
341 if (cascade_irq != NO_IRQ)
342 generic_handle_irq(cascade_irq);
343 desc->chip->eoi(irq);
347 * Finds the open-pic node and sets up the mpic driver.
349 static void __init chrp_find_openpic(void)
351 struct device_node *np, *root;
353 int isu_size, idu_size;
354 const unsigned int *iranges, *opprop = NULL;
356 unsigned long opaddr;
359 np = of_find_node_by_type(NULL, "open-pic");
362 root = of_find_node_by_path("/");
364 opprop = get_property(root, "platform-open-pic", &oplen);
365 na = prom_n_addr_cells(root);
367 if (opprop && oplen >= na * sizeof(unsigned int)) {
368 opaddr = opprop[na-1]; /* assume 32-bit */
369 oplen /= na * sizeof(unsigned int);
372 if (of_address_to_resource(np, 0, &r)) {
379 printk(KERN_INFO "OpenPIC at %lx\n", opaddr);
381 iranges = get_property(np, "interrupt-ranges", &len);
383 len = 0; /* non-distributed mpic */
385 len /= 2 * sizeof(unsigned int);
388 * The first pair of cells in interrupt-ranges refers to the
389 * IDU; subsequent pairs refer to the ISUs.
392 printk(KERN_ERR "Insufficient addresses for distributed"
393 " OpenPIC (%d < %d)\n", oplen, len);
399 if (len > 0 && iranges[1] != 0) {
400 printk(KERN_INFO "OpenPIC irqs %d..%d in IDU\n",
401 iranges[0], iranges[0] + iranges[1] - 1);
402 idu_size = iranges[1];
405 isu_size = iranges[3];
407 chrp_mpic = mpic_alloc(np, opaddr, MPIC_PRIMARY,
408 isu_size, 0, " MPIC ");
409 if (chrp_mpic == NULL) {
410 printk(KERN_ERR "Failed to allocate MPIC structure\n");
414 for (i = 1; i < len; ++i) {
417 printk(KERN_INFO "OpenPIC irqs %d..%d in ISU at %x\n",
418 iranges[0], iranges[0] + iranges[1] - 1,
420 mpic_assign_isu(chrp_mpic, i - 1, opprop[j]);
423 mpic_init(chrp_mpic);
424 ppc_md.get_irq = mpic_get_irq;
430 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
431 static struct irqaction xmon_irqaction = {
433 .mask = CPU_MASK_NONE,
434 .name = "XMON break",
438 static void __init chrp_find_8259(void)
440 struct device_node *np, *pic = NULL;
441 unsigned long chrp_int_ack = 0;
442 unsigned int cascade_irq;
444 /* Look for cascade */
445 for_each_node_by_type(np, "interrupt-controller")
446 if (device_is_compatible(np, "chrp,iic")) {
450 /* Ok, 8259 wasn't found. We need to handle the case where
451 * we have a pegasos that claims to be chrp but doesn't have
452 * a proper interrupt tree
454 if (pic == NULL && chrp_mpic != NULL) {
455 printk(KERN_ERR "i8259: Not found in device-tree"
456 " assuming no legacy interrupts\n");
460 /* Look for intack. In a perfect world, we would look for it on
461 * the ISA bus that holds the 8259 but heh... Works that way. If
462 * we ever see a problem, we can try to re-use the pSeries code here.
463 * Also, Pegasos-type platforms don't have a proper node to start
466 for (np = find_devices("pci"); np != NULL; np = np->next) {
467 const unsigned int *addrp = get_property(np,
468 "8259-interrupt-acknowledge", NULL);
472 chrp_int_ack = addrp[prom_n_addr_cells(np)-1];
476 printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
477 " address, polling\n");
479 i8259_init(pic, chrp_int_ack);
480 if (ppc_md.get_irq == NULL)
481 ppc_md.get_irq = i8259_irq;
482 if (chrp_mpic != NULL) {
483 cascade_irq = irq_of_parse_and_map(pic, 0);
484 if (cascade_irq == NO_IRQ)
485 printk(KERN_ERR "i8259: failed to map cascade irq\n");
487 set_irq_chained_handler(cascade_irq,
492 void __init chrp_init_IRQ(void)
494 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
495 struct device_node *kbd;
501 /* Pegasos has no MPIC, those ops would make it crash. It might be an
502 * option to move setting them to after we probe the PIC though
504 if (chrp_mpic != NULL)
505 smp_ops = &chrp_smp_ops;
506 #endif /* CONFIG_SMP */
508 if (_chrp_type == _CHRP_Pegasos)
509 ppc_md.get_irq = i8259_irq;
511 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
512 /* see if there is a keyboard in the device tree
513 with a parent of type "adb" */
514 for (kbd = find_devices("keyboard"); kbd; kbd = kbd->next)
515 if (kbd->parent && kbd->parent->type
516 && strcmp(kbd->parent->type, "adb") == 0)
519 setup_irq(HYDRA_INT_ADB_NMI, &xmon_irqaction);
526 struct device_node *device;
527 const unsigned int *p = NULL;
533 request_region(0x20,0x20,"pic1");
534 request_region(0xa0,0x20,"pic2");
535 request_region(0x00,0x20,"dma1");
536 request_region(0x40,0x20,"timer");
537 request_region(0x80,0x10,"dma page reg");
538 request_region(0xc0,0x20,"dma2");
540 /* Get the event scan rate for the rtas so we know how
541 * often it expects a heartbeat. -- Cort
543 device = find_devices("rtas");
545 p = get_property(device, "rtas-event-scan-rate", NULL);
548 * Arrange to call chrp_event_scan at least *p times
549 * per minute. We use 59 rather than 60 here so that
550 * the rate will be slightly higher than the minimum.
551 * This all assumes we don't do hotplug CPU on any
552 * machine that needs the event scans done.
554 unsigned long interval, offset;
556 struct timer_list *timer;
558 interval = HZ * 59 / *p;
560 ncpus = num_online_cpus();
561 event_scan_interval = ncpus * interval;
562 for (cpu = 0; cpu < ncpus; ++cpu) {
563 timer = &per_cpu(heartbeat_timer, cpu);
564 setup_timer(timer, chrp_event_scan, 0);
565 timer->expires = jiffies + offset;
566 add_timer_on(timer, cpu);
569 printk("RTAS Event Scan Rate: %u (%lu jiffies)\n",
574 ppc_md.progress(" Have fun! ", 0x7777);
577 static int __init chrp_probe(void)
579 char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
580 "device_type", NULL);
583 if (strcmp(dtype, "chrp"))
586 ISA_DMA_THRESHOLD = ~0L;
587 DMA_MODE_READ = 0x44;
588 DMA_MODE_WRITE = 0x48;
589 isa_io_base = CHRP_ISA_IO_BASE; /* default value */
594 define_machine(chrp) {
597 .setup_arch = chrp_setup_arch,
599 .show_cpuinfo = chrp_show_cpuinfo,
600 .init_IRQ = chrp_init_IRQ,
601 .pcibios_fixup = chrp_pcibios_fixup,
602 .restart = rtas_restart,
603 .power_off = rtas_power_off,
605 .time_init = chrp_time_init,
606 .set_rtc_time = chrp_set_rtc_time,
607 .get_rtc_time = chrp_get_rtc_time,
608 .calibrate_decr = generic_calibrate_decr,
609 .phys_mem_access_prot = pci_phys_mem_access_prot,