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 *, struct pt_regs *);
75 extern unsigned long loops_per_jiffy;
78 extern struct smp_ops_t chrp_smp_ops;
81 static const char *gg2_memtypes[4] = {
82 "FPM", "SDRAM", "EDO", "BEDO"
84 static const char *gg2_cachesizes[4] = {
85 "256 KB", "512 KB", "1 MB", "Reserved"
87 static const char *gg2_cachetypes[4] = {
88 "Asynchronous", "Reserved", "Flow-Through Synchronous",
89 "Pipelined Synchronous"
91 static const char *gg2_cachemodes[4] = {
92 "Disabled", "Write-Through", "Copy-Back", "Transparent Mode"
95 void chrp_show_cpuinfo(struct seq_file *m)
99 struct device_node *root;
100 const char *model = "";
102 root = find_path_device("/");
104 model = get_property(root, "model", NULL);
105 seq_printf(m, "machine\t\t: CHRP %s\n", model);
107 /* longtrail (goldengate) stuff */
108 if (!strncmp(model, "IBM,LongTrail", 13)) {
109 /* VLSI VAS96011/12 `Golden Gate 2' */
111 sdramen = (in_le32(gg2_pci_config_base + GG2_PCI_DRAM_CTRL)
113 for (i = 0; i < (sdramen ? 4 : 6); i++) {
114 t = in_le32(gg2_pci_config_base+
119 switch ((t>>8) & 0x1f) {
142 seq_printf(m, "memory bank %d\t: %s %s\n", i, model,
143 gg2_memtypes[sdramen ? 1 : ((t>>1) & 3)]);
146 t = in_le32(gg2_pci_config_base+GG2_PCI_CC_CTRL);
147 seq_printf(m, "board l2\t: %s %s (%s)\n",
148 gg2_cachesizes[(t>>7) & 3],
149 gg2_cachetypes[(t>>2) & 3],
150 gg2_cachemodes[t & 3]);
155 * Fixes for the National Semiconductor PC78308VUL SuperI/O
157 * Some versions of Open Firmware incorrectly initialize the IRQ settings
158 * for keyboard and mouse
160 static inline void __init sio_write(u8 val, u8 index)
166 static inline u8 __init sio_read(u8 index)
172 static void __init sio_fixup_irq(const char *name, u8 device, u8 level,
175 u8 level0, type0, active;
177 /* select logical device */
178 sio_write(device, 0x07);
179 active = sio_read(0x30);
180 level0 = sio_read(0x70);
181 type0 = sio_read(0x71);
182 if (level0 != level || type0 != type || !active) {
183 printk(KERN_WARNING "sio: %s irq level %d, type %d, %sactive: "
184 "remapping to level %d, type %d, active\n",
185 name, level0, type0, !active ? "in" : "", level, type);
186 sio_write(0x01, 0x30);
187 sio_write(level, 0x70);
188 sio_write(type, 0x71);
192 static void __init sio_init(void)
194 struct device_node *root;
196 if ((root = find_path_device("/")) &&
197 !strncmp(get_property(root, "model", NULL), "IBM,LongTrail", 13)) {
198 /* logical device 0 (KBC/Keyboard) */
199 sio_fixup_irq("keyboard", 0, 1, 2);
200 /* select logical device 1 (KBC/Mouse) */
201 sio_fixup_irq("mouse", 1, 12, 2);
206 static void __init pegasos_set_l2cr(void)
208 struct device_node *np;
210 /* On Pegasos, enable the l2 cache if needed, as the OF forgets it */
211 if (_chrp_type != _CHRP_Pegasos)
214 /* Enable L2 cache if needed */
215 np = find_type_devices("cpu");
217 unsigned int *l2cr = (unsigned int *)
218 get_property (np, "l2cr", NULL);
220 printk ("Pegasos l2cr : no cpu l2cr property found\n");
223 if (!((*l2cr) & 0x80000000)) {
224 printk ("Pegasos l2cr : L2 cache was not active, "
227 _set_L2CR((*l2cr) | 0x80000000);
232 void __init chrp_setup_arch(void)
234 struct device_node *root = find_path_device ("/");
235 char *machine = NULL;
237 /* init to some ~sane value until calibrate_delay() runs */
238 loops_per_jiffy = 50000000/HZ;
241 machine = get_property(root, "model", NULL);
242 if (machine && strncmp(machine, "Pegasos", 7) == 0) {
243 _chrp_type = _CHRP_Pegasos;
244 } else if (machine && strncmp(machine, "IBM", 3) == 0) {
245 _chrp_type = _CHRP_IBM;
246 } else if (machine && strncmp(machine, "MOT", 3) == 0) {
247 _chrp_type = _CHRP_Motorola;
249 /* Let's assume it is an IBM chrp if all else fails */
250 _chrp_type = _CHRP_IBM;
252 printk("chrp type = %x\n", _chrp_type);
255 if (rtas_token("display-character") >= 0)
256 ppc_md.progress = rtas_progress;
258 /* use RTAS time-of-day routines if available */
259 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
260 ppc_md.get_boot_time = rtas_get_boot_time;
261 ppc_md.get_rtc_time = rtas_get_rtc_time;
262 ppc_md.set_rtc_time = rtas_set_rtc_time;
265 #ifdef CONFIG_BLK_DEV_INITRD
266 /* this is fine for chrp */
267 initrd_below_start_ok = 1;
270 ROOT_DEV = Root_RAM0;
273 ROOT_DEV = Root_SDA2; /* sda2 (sda1 is for the kernel) */
275 /* On pegasos, enable the L2 cache if not already done by OF */
278 /* Lookup PCI host bridges */
282 * Temporary fixes for PCI devices.
285 hydra_init(); /* Mac I/O */
288 * Fix the Super I/O configuration
292 pci_create_OF_bus_map();
295 * Print the banner, then scroll down so boot progress
296 * can be printed. -- Cort
298 if (ppc_md.progress) ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0x0);
302 chrp_event_scan(unsigned long unused)
304 unsigned char log[1024];
307 /* XXX: we should loop until the hardware says no more error logs -- Cort */
308 rtas_call(rtas_token("event-scan"), 4, 1, &ret, 0xffffffff, 0,
310 mod_timer(&__get_cpu_var(heartbeat_timer),
311 jiffies + event_scan_interval);
314 static void chrp_8259_cascade(unsigned int irq, struct irq_desc *desc,
315 struct pt_regs *regs)
317 unsigned int cascade_irq = i8259_irq(regs);
318 if (cascade_irq != NO_IRQ)
319 generic_handle_irq(cascade_irq, regs);
320 desc->chip->eoi(irq);
324 * Finds the open-pic node and sets up the mpic driver.
326 static void __init chrp_find_openpic(void)
328 struct device_node *np, *root;
330 int isu_size, idu_size;
331 unsigned int *iranges, *opprop = NULL;
333 unsigned long opaddr;
336 np = of_find_node_by_type(NULL, "open-pic");
339 root = of_find_node_by_path("/");
341 opprop = (unsigned int *) get_property
342 (root, "platform-open-pic", &oplen);
343 na = prom_n_addr_cells(root);
345 if (opprop && oplen >= na * sizeof(unsigned int)) {
346 opaddr = opprop[na-1]; /* assume 32-bit */
347 oplen /= na * sizeof(unsigned int);
350 if (of_address_to_resource(np, 0, &r)) {
357 printk(KERN_INFO "OpenPIC at %lx\n", opaddr);
359 iranges = (unsigned int *) get_property(np, "interrupt-ranges", &len);
361 len = 0; /* non-distributed mpic */
363 len /= 2 * sizeof(unsigned int);
366 * The first pair of cells in interrupt-ranges refers to the
367 * IDU; subsequent pairs refer to the ISUs.
370 printk(KERN_ERR "Insufficient addresses for distributed"
371 " OpenPIC (%d < %d)\n", oplen, len);
377 if (len > 0 && iranges[1] != 0) {
378 printk(KERN_INFO "OpenPIC irqs %d..%d in IDU\n",
379 iranges[0], iranges[0] + iranges[1] - 1);
380 idu_size = iranges[1];
383 isu_size = iranges[3];
385 chrp_mpic = mpic_alloc(np, opaddr, MPIC_PRIMARY,
386 isu_size, 0, " MPIC ");
387 if (chrp_mpic == NULL) {
388 printk(KERN_ERR "Failed to allocate MPIC structure\n");
392 for (i = 1; i < len; ++i) {
395 printk(KERN_INFO "OpenPIC irqs %d..%d in ISU at %x\n",
396 iranges[0], iranges[0] + iranges[1] - 1,
398 mpic_assign_isu(chrp_mpic, i - 1, opprop[j]);
401 mpic_init(chrp_mpic);
402 ppc_md.get_irq = mpic_get_irq;
408 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
409 static struct irqaction xmon_irqaction = {
411 .mask = CPU_MASK_NONE,
412 .name = "XMON break",
416 static void __init chrp_find_8259(void)
418 struct device_node *np, *pic = NULL;
419 unsigned long chrp_int_ack = 0;
420 unsigned int cascade_irq;
422 /* Look for cascade */
423 for_each_node_by_type(np, "interrupt-controller")
424 if (device_is_compatible(np, "chrp,iic")) {
428 /* Ok, 8259 wasn't found. We need to handle the case where
429 * we have a pegasos that claims to be chrp but doesn't have
430 * a proper interrupt tree
432 if (pic == NULL && chrp_mpic != NULL) {
433 printk(KERN_ERR "i8259: Not found in device-tree"
434 " assuming no legacy interrupts\n");
438 /* Look for intack. In a perfect world, we would look for it on
439 * the ISA bus that holds the 8259 but heh... Works that way. If
440 * we ever see a problem, we can try to re-use the pSeries code here.
441 * Also, Pegasos-type platforms don't have a proper node to start
444 for (np = find_devices("pci"); np != NULL; np = np->next) {
445 unsigned int *addrp = (unsigned int *)
446 get_property(np, "8259-interrupt-acknowledge", NULL);
450 chrp_int_ack = addrp[prom_n_addr_cells(np)-1];
454 printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
455 " address, polling\n");
457 i8259_init(pic, chrp_int_ack);
458 if (ppc_md.get_irq == NULL)
459 ppc_md.get_irq = i8259_irq;
460 if (chrp_mpic != NULL) {
461 cascade_irq = irq_of_parse_and_map(pic, 0);
462 if (cascade_irq == NO_IRQ)
463 printk(KERN_ERR "i8259: failed to map cascade irq\n");
465 set_irq_chained_handler(cascade_irq,
470 void __init chrp_init_IRQ(void)
472 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
473 struct device_node *kbd;
479 /* Pegasos has no MPIC, those ops would make it crash. It might be an
480 * option to move setting them to after we probe the PIC though
482 if (chrp_mpic != NULL)
483 smp_ops = &chrp_smp_ops;
484 #endif /* CONFIG_SMP */
486 if (_chrp_type == _CHRP_Pegasos)
487 ppc_md.get_irq = i8259_irq;
489 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
490 /* see if there is a keyboard in the device tree
491 with a parent of type "adb" */
492 for (kbd = find_devices("keyboard"); kbd; kbd = kbd->next)
493 if (kbd->parent && kbd->parent->type
494 && strcmp(kbd->parent->type, "adb") == 0)
497 setup_irq(HYDRA_INT_ADB_NMI, &xmon_irqaction);
504 struct device_node *device;
505 unsigned int *p = NULL;
511 request_region(0x20,0x20,"pic1");
512 request_region(0xa0,0x20,"pic2");
513 request_region(0x00,0x20,"dma1");
514 request_region(0x40,0x20,"timer");
515 request_region(0x80,0x10,"dma page reg");
516 request_region(0xc0,0x20,"dma2");
518 /* Get the event scan rate for the rtas so we know how
519 * often it expects a heartbeat. -- Cort
521 device = find_devices("rtas");
523 p = (unsigned int *) get_property
524 (device, "rtas-event-scan-rate", NULL);
527 * Arrange to call chrp_event_scan at least *p times
528 * per minute. We use 59 rather than 60 here so that
529 * the rate will be slightly higher than the minimum.
530 * This all assumes we don't do hotplug CPU on any
531 * machine that needs the event scans done.
533 unsigned long interval, offset;
535 struct timer_list *timer;
537 interval = HZ * 59 / *p;
539 ncpus = num_online_cpus();
540 event_scan_interval = ncpus * interval;
541 for (cpu = 0; cpu < ncpus; ++cpu) {
542 timer = &per_cpu(heartbeat_timer, cpu);
543 setup_timer(timer, chrp_event_scan, 0);
544 timer->expires = jiffies + offset;
545 add_timer_on(timer, cpu);
548 printk("RTAS Event Scan Rate: %u (%lu jiffies)\n",
553 ppc_md.progress(" Have fun! ", 0x7777);
556 static int __init chrp_probe(void)
558 char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
559 "device_type", NULL);
562 if (strcmp(dtype, "chrp"))
565 ISA_DMA_THRESHOLD = ~0L;
566 DMA_MODE_READ = 0x44;
567 DMA_MODE_WRITE = 0x48;
568 isa_io_base = CHRP_ISA_IO_BASE; /* default value */
573 define_machine(chrp) {
576 .setup_arch = chrp_setup_arch,
578 .show_cpuinfo = chrp_show_cpuinfo,
579 .init_IRQ = chrp_init_IRQ,
580 .pcibios_fixup = chrp_pcibios_fixup,
581 .restart = rtas_restart,
582 .power_off = rtas_power_off,
584 .time_init = chrp_time_init,
585 .set_rtc_time = chrp_set_rtc_time,
586 .get_rtc_time = chrp_get_rtc_time,
587 .calibrate_decr = generic_calibrate_decr,
588 .phys_mem_access_prot = pci_phys_mem_access_prot,