1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 1995 Linus Torvalds
4 * Adapted from 'alpha' version by Gary Thomas
5 * Modified by Cort Dougan (cort@cs.nmt.edu)
6 */
7
8 /*
9 * bootup setup stuff..
10 */
11
12 #include <linux/errno.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/stddef.h>
17 #include <linux/unistd.h>
18 #include <linux/ptrace.h>
19 #include <linux/user.h>
20 #include <linux/tty.h>
21 #include <linux/major.h>
22 #include <linux/interrupt.h>
23 #include <linux/reboot.h>
24 #include <linux/init.h>
25 #include <linux/pci.h>
26 #include <generated/utsrelease.h>
27 #include <linux/adb.h>
28 #include <linux/module.h>
29 #include <linux/delay.h>
30 #include <linux/console.h>
31 #include <linux/seq_file.h>
32 #include <linux/root_dev.h>
33 #include <linux/initrd.h>
34 #include <linux/timer.h>
35
36 #include <asm/io.h>
37 #include <asm/prom.h>
38 #include <asm/pci-bridge.h>
39 #include <asm/dma.h>
40 #include <asm/machdep.h>
41 #include <asm/irq.h>
42 #include <asm/hydra.h>
43 #include <asm/sections.h>
44 #include <asm/time.h>
45 #include <asm/i8259.h>
46 #include <asm/mpic.h>
47 #include <asm/rtas.h>
48 #include <asm/xmon.h>
49
50 #include "chrp.h"
51 #include "gg2.h"
52
53 void rtas_indicator_progress(char *, unsigned short);
54
55 int _chrp_type;
56 EXPORT_SYMBOL(_chrp_type);
57
58 static struct mpic *chrp_mpic;
59
60 /* Used for doing CHRP event-scans */
61 DEFINE_PER_CPU(struct timer_list, heartbeat_timer);
62 unsigned long event_scan_interval;
63
64 extern unsigned long loops_per_jiffy;
65
66 /* To be replaced by RTAS when available */
67 static unsigned int __iomem *briq_SPOR;
68
69 #ifdef CONFIG_SMP
70 extern struct smp_ops_t chrp_smp_ops;
71 #endif
72
73 static const char *gg2_memtypes[4] = {
74 "FPM", "SDRAM", "EDO", "BEDO"
75 };
76 static const char *gg2_cachesizes[4] = {
77 "256 KB", "512 KB", "1 MB", "Reserved"
78 };
79 static const char *gg2_cachetypes[4] = {
80 "Asynchronous", "Reserved", "Flow-Through Synchronous",
81 "Pipelined Synchronous"
82 };
83 static const char *gg2_cachemodes[4] = {
84 "Disabled", "Write-Through", "Copy-Back", "Transparent Mode"
85 };
86
87 static const char *chrp_names[] = {
88 "Unknown",
89 "","","",
90 "Motorola",
91 "IBM or Longtrail",
92 "Genesi Pegasos",
93 "Total Impact Briq"
94 };
95
chrp_show_cpuinfo(struct seq_file * m)96 static void chrp_show_cpuinfo(struct seq_file *m)
97 {
98 int i, sdramen;
99 unsigned int t;
100 struct device_node *root;
101 const char *model = "";
102
103 root = of_find_node_by_path("/");
104 if (root)
105 model = of_get_property(root, "model", NULL);
106 seq_printf(m, "machine\t\t: CHRP %s\n", model);
107
108 /* longtrail (goldengate) stuff */
109 if (model && !strncmp(model, "IBM,LongTrail", 13)) {
110 /* VLSI VAS96011/12 `Golden Gate 2' */
111 /* Memory banks */
112 sdramen = (in_le32(gg2_pci_config_base + GG2_PCI_DRAM_CTRL)
113 >>31) & 1;
114 for (i = 0; i < (sdramen ? 4 : 6); i++) {
115 t = in_le32(gg2_pci_config_base+
116 GG2_PCI_DRAM_BANK0+
117 i*4);
118 if (!(t & 1))
119 continue;
120 switch ((t>>8) & 0x1f) {
121 case 0x1f:
122 model = "4 MB";
123 break;
124 case 0x1e:
125 model = "8 MB";
126 break;
127 case 0x1c:
128 model = "16 MB";
129 break;
130 case 0x18:
131 model = "32 MB";
132 break;
133 case 0x10:
134 model = "64 MB";
135 break;
136 case 0x00:
137 model = "128 MB";
138 break;
139 default:
140 model = "Reserved";
141 break;
142 }
143 seq_printf(m, "memory bank %d\t: %s %s\n", i, model,
144 gg2_memtypes[sdramen ? 1 : ((t>>1) & 3)]);
145 }
146 /* L2 cache */
147 t = in_le32(gg2_pci_config_base+GG2_PCI_CC_CTRL);
148 seq_printf(m, "board l2\t: %s %s (%s)\n",
149 gg2_cachesizes[(t>>7) & 3],
150 gg2_cachetypes[(t>>2) & 3],
151 gg2_cachemodes[t & 3]);
152 }
153 of_node_put(root);
154 }
155
156 /*
157 * Fixes for the National Semiconductor PC78308VUL SuperI/O
158 *
159 * Some versions of Open Firmware incorrectly initialize the IRQ settings
160 * for keyboard and mouse
161 */
sio_write(u8 val,u8 index)162 static inline void __init sio_write(u8 val, u8 index)
163 {
164 outb(index, 0x15c);
165 outb(val, 0x15d);
166 }
167
sio_read(u8 index)168 static inline u8 __init sio_read(u8 index)
169 {
170 outb(index, 0x15c);
171 return inb(0x15d);
172 }
173
sio_fixup_irq(const char * name,u8 device,u8 level,u8 type)174 static void __init sio_fixup_irq(const char *name, u8 device, u8 level,
175 u8 type)
176 {
177 u8 level0, type0, active;
178
179 /* select logical device */
180 sio_write(device, 0x07);
181 active = sio_read(0x30);
182 level0 = sio_read(0x70);
183 type0 = sio_read(0x71);
184 if (level0 != level || type0 != type || !active) {
185 printk(KERN_WARNING "sio: %s irq level %d, type %d, %sactive: "
186 "remapping to level %d, type %d, active\n",
187 name, level0, type0, !active ? "in" : "", level, type);
188 sio_write(0x01, 0x30);
189 sio_write(level, 0x70);
190 sio_write(type, 0x71);
191 }
192 }
193
sio_init(void)194 static void __init sio_init(void)
195 {
196 struct device_node *root;
197 const char *model;
198
199 root = of_find_node_by_path("/");
200 if (!root)
201 return;
202
203 model = of_get_property(root, "model", NULL);
204 if (model && !strncmp(model, "IBM,LongTrail", 13)) {
205 /* logical device 0 (KBC/Keyboard) */
206 sio_fixup_irq("keyboard", 0, 1, 2);
207 /* select logical device 1 (KBC/Mouse) */
208 sio_fixup_irq("mouse", 1, 12, 2);
209 }
210
211 of_node_put(root);
212 }
213
214
pegasos_set_l2cr(void)215 static void __init pegasos_set_l2cr(void)
216 {
217 struct device_node *np;
218
219 /* On Pegasos, enable the l2 cache if needed, as the OF forgets it */
220 if (_chrp_type != _CHRP_Pegasos)
221 return;
222
223 /* Enable L2 cache if needed */
224 np = of_find_node_by_type(NULL, "cpu");
225 if (np != NULL) {
226 const unsigned int *l2cr = of_get_property(np, "l2cr", NULL);
227 if (l2cr == NULL) {
228 printk ("Pegasos l2cr : no cpu l2cr property found\n");
229 goto out;
230 }
231 if (!((*l2cr) & 0x80000000)) {
232 printk ("Pegasos l2cr : L2 cache was not active, "
233 "activating\n");
234 _set_L2CR(0);
235 _set_L2CR((*l2cr) | 0x80000000);
236 }
237 }
238 out:
239 of_node_put(np);
240 }
241
briq_restart(char * cmd)242 static void __noreturn briq_restart(char *cmd)
243 {
244 local_irq_disable();
245 if (briq_SPOR)
246 out_be32(briq_SPOR, 0);
247 for(;;);
248 }
249
250 /*
251 * Per default, input/output-device points to the keyboard/screen
252 * If no card is installed, the built-in serial port is used as a fallback.
253 * But unfortunately, the firmware does not connect /chosen/{stdin,stdout}
254 * the the built-in serial node. Instead, a /failsafe node is created.
255 */
chrp_init(void)256 static __init void chrp_init(void)
257 {
258 struct device_node *node;
259 const char *property;
260
261 if (strstr(boot_command_line, "console="))
262 return;
263 /* find the boot console from /chosen/stdout */
264 if (!of_chosen)
265 return;
266 node = of_find_node_by_path("/");
267 if (!node)
268 return;
269 property = of_get_property(node, "model", NULL);
270 if (!property)
271 goto out_put;
272 if (strcmp(property, "Pegasos2"))
273 goto out_put;
274 /* this is a Pegasos2 */
275 property = of_get_property(of_chosen, "linux,stdout-path", NULL);
276 if (!property)
277 goto out_put;
278 of_node_put(node);
279 node = of_find_node_by_path(property);
280 if (!node)
281 return;
282 if (!of_node_is_type(node, "serial"))
283 goto out_put;
284 /*
285 * The 9pin connector is either /failsafe
286 * or /pci@80000000/isa@C/serial@i2F8
287 * The optional graphics card has also type 'serial' in VGA mode.
288 */
289 if (of_node_name_eq(node, "failsafe") || of_node_name_eq(node, "serial"))
290 add_preferred_console("ttyS", 0, NULL);
291 out_put:
292 of_node_put(node);
293 }
294
chrp_setup_arch(void)295 static void __init chrp_setup_arch(void)
296 {
297 struct device_node *root = of_find_node_by_path("/");
298 const char *machine = NULL;
299
300 /* init to some ~sane value until calibrate_delay() runs */
301 loops_per_jiffy = 50000000/HZ;
302
303 if (root)
304 machine = of_get_property(root, "model", NULL);
305 if (machine && strncmp(machine, "Pegasos", 7) == 0) {
306 _chrp_type = _CHRP_Pegasos;
307 } else if (machine && strncmp(machine, "IBM", 3) == 0) {
308 _chrp_type = _CHRP_IBM;
309 } else if (machine && strncmp(machine, "MOT", 3) == 0) {
310 _chrp_type = _CHRP_Motorola;
311 } else if (machine && strncmp(machine, "TotalImpact,BRIQ-1", 18) == 0) {
312 _chrp_type = _CHRP_briq;
313 /* Map the SPOR register on briq and change the restart hook */
314 briq_SPOR = ioremap(0xff0000e8, 4);
315 ppc_md.restart = briq_restart;
316 } else {
317 /* Let's assume it is an IBM chrp if all else fails */
318 _chrp_type = _CHRP_IBM;
319 }
320 of_node_put(root);
321 printk("chrp type = %x [%s]\n", _chrp_type, chrp_names[_chrp_type]);
322
323 rtas_initialize();
324 if (rtas_token("display-character") >= 0)
325 ppc_md.progress = rtas_progress;
326
327 /* use RTAS time-of-day routines if available */
328 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
329 ppc_md.get_boot_time = rtas_get_boot_time;
330 ppc_md.get_rtc_time = rtas_get_rtc_time;
331 ppc_md.set_rtc_time = rtas_set_rtc_time;
332 }
333
334 /* On pegasos, enable the L2 cache if not already done by OF */
335 pegasos_set_l2cr();
336
337 /*
338 * Fix the Super I/O configuration
339 */
340 sio_init();
341
342 /*
343 * Print the banner, then scroll down so boot progress
344 * can be printed. -- Cort
345 */
346 if (ppc_md.progress) ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0x0);
347 }
348
chrp_8259_cascade(struct irq_desc * desc)349 static void chrp_8259_cascade(struct irq_desc *desc)
350 {
351 struct irq_chip *chip = irq_desc_get_chip(desc);
352 unsigned int cascade_irq = i8259_irq();
353
354 if (cascade_irq)
355 generic_handle_irq(cascade_irq);
356
357 chip->irq_eoi(&desc->irq_data);
358 }
359
360 /*
361 * Finds the open-pic node and sets up the mpic driver.
362 */
chrp_find_openpic(void)363 static void __init chrp_find_openpic(void)
364 {
365 struct device_node *np, *root;
366 int len, i, j;
367 int isu_size;
368 const unsigned int *iranges, *opprop = NULL;
369 int oplen = 0;
370 unsigned long opaddr;
371 int na = 1;
372
373 np = of_find_node_by_type(NULL, "open-pic");
374 if (np == NULL)
375 return;
376 root = of_find_node_by_path("/");
377 if (root) {
378 opprop = of_get_property(root, "platform-open-pic", &oplen);
379 na = of_n_addr_cells(root);
380 }
381 if (opprop && oplen >= na * sizeof(unsigned int)) {
382 opaddr = opprop[na-1]; /* assume 32-bit */
383 oplen /= na * sizeof(unsigned int);
384 } else {
385 struct resource r;
386 if (of_address_to_resource(np, 0, &r)) {
387 goto bail;
388 }
389 opaddr = r.start;
390 oplen = 0;
391 }
392
393 printk(KERN_INFO "OpenPIC at %lx\n", opaddr);
394
395 iranges = of_get_property(np, "interrupt-ranges", &len);
396 if (iranges == NULL)
397 len = 0; /* non-distributed mpic */
398 else
399 len /= 2 * sizeof(unsigned int);
400
401 /*
402 * The first pair of cells in interrupt-ranges refers to the
403 * IDU; subsequent pairs refer to the ISUs.
404 */
405 if (oplen < len) {
406 printk(KERN_ERR "Insufficient addresses for distributed"
407 " OpenPIC (%d < %d)\n", oplen, len);
408 len = oplen;
409 }
410
411 isu_size = 0;
412 if (len > 0 && iranges[1] != 0) {
413 printk(KERN_INFO "OpenPIC irqs %d..%d in IDU\n",
414 iranges[0], iranges[0] + iranges[1] - 1);
415 }
416 if (len > 1)
417 isu_size = iranges[3];
418
419 chrp_mpic = mpic_alloc(np, opaddr, MPIC_NO_RESET,
420 isu_size, 0, " MPIC ");
421 if (chrp_mpic == NULL) {
422 printk(KERN_ERR "Failed to allocate MPIC structure\n");
423 goto bail;
424 }
425 j = na - 1;
426 for (i = 1; i < len; ++i) {
427 iranges += 2;
428 j += na;
429 printk(KERN_INFO "OpenPIC irqs %d..%d in ISU at %x\n",
430 iranges[0], iranges[0] + iranges[1] - 1,
431 opprop[j]);
432 mpic_assign_isu(chrp_mpic, i - 1, opprop[j]);
433 }
434
435 mpic_init(chrp_mpic);
436 ppc_md.get_irq = mpic_get_irq;
437 bail:
438 of_node_put(root);
439 of_node_put(np);
440 }
441
chrp_find_8259(void)442 static void __init chrp_find_8259(void)
443 {
444 struct device_node *np, *pic = NULL;
445 unsigned long chrp_int_ack = 0;
446 unsigned int cascade_irq;
447
448 /* Look for cascade */
449 for_each_node_by_type(np, "interrupt-controller")
450 if (of_device_is_compatible(np, "chrp,iic")) {
451 pic = np;
452 break;
453 }
454 /* Ok, 8259 wasn't found. We need to handle the case where
455 * we have a pegasos that claims to be chrp but doesn't have
456 * a proper interrupt tree
457 */
458 if (pic == NULL && chrp_mpic != NULL) {
459 printk(KERN_ERR "i8259: Not found in device-tree"
460 " assuming no legacy interrupts\n");
461 return;
462 }
463
464 /* Look for intack. In a perfect world, we would look for it on
465 * the ISA bus that holds the 8259 but heh... Works that way. If
466 * we ever see a problem, we can try to re-use the pSeries code here.
467 * Also, Pegasos-type platforms don't have a proper node to start
468 * from anyway
469 */
470 for_each_node_by_name(np, "pci") {
471 const unsigned int *addrp = of_get_property(np,
472 "8259-interrupt-acknowledge", NULL);
473
474 if (addrp == NULL)
475 continue;
476 chrp_int_ack = addrp[of_n_addr_cells(np)-1];
477 break;
478 }
479 of_node_put(np);
480 if (np == NULL)
481 printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
482 " address, polling\n");
483
484 i8259_init(pic, chrp_int_ack);
485 if (ppc_md.get_irq == NULL) {
486 ppc_md.get_irq = i8259_irq;
487 irq_set_default_host(i8259_get_host());
488 }
489 if (chrp_mpic != NULL) {
490 cascade_irq = irq_of_parse_and_map(pic, 0);
491 if (!cascade_irq)
492 printk(KERN_ERR "i8259: failed to map cascade irq\n");
493 else
494 irq_set_chained_handler(cascade_irq,
495 chrp_8259_cascade);
496 }
497 }
498
chrp_init_IRQ(void)499 static void __init chrp_init_IRQ(void)
500 {
501 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
502 struct device_node *kbd;
503 #endif
504 chrp_find_openpic();
505 chrp_find_8259();
506
507 #ifdef CONFIG_SMP
508 /* Pegasos has no MPIC, those ops would make it crash. It might be an
509 * option to move setting them to after we probe the PIC though
510 */
511 if (chrp_mpic != NULL)
512 smp_ops = &chrp_smp_ops;
513 #endif /* CONFIG_SMP */
514
515 if (_chrp_type == _CHRP_Pegasos)
516 ppc_md.get_irq = i8259_irq;
517
518 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
519 /* see if there is a keyboard in the device tree
520 with a parent of type "adb" */
521 for_each_node_by_name(kbd, "keyboard")
522 if (of_node_is_type(kbd->parent, "adb"))
523 break;
524 of_node_put(kbd);
525 if (kbd) {
526 if (request_irq(HYDRA_INT_ADB_NMI, xmon_irq, 0, "XMON break",
527 NULL))
528 pr_err("Failed to register XMON break interrupt\n");
529 }
530 #endif
531 }
532
533 static void __init
chrp_init2(void)534 chrp_init2(void)
535 {
536 #if IS_ENABLED(CONFIG_NVRAM)
537 chrp_nvram_init();
538 #endif
539
540 request_region(0x20,0x20,"pic1");
541 request_region(0xa0,0x20,"pic2");
542 request_region(0x00,0x20,"dma1");
543 request_region(0x40,0x20,"timer");
544 request_region(0x80,0x10,"dma page reg");
545 request_region(0xc0,0x20,"dma2");
546
547 if (ppc_md.progress)
548 ppc_md.progress(" Have fun! ", 0x7777);
549 }
550
chrp_probe(void)551 static int __init chrp_probe(void)
552 {
553 const char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
554 "device_type", NULL);
555 if (dtype == NULL)
556 return 0;
557 if (strcmp(dtype, "chrp"))
558 return 0;
559
560 DMA_MODE_READ = 0x44;
561 DMA_MODE_WRITE = 0x48;
562
563 pm_power_off = rtas_power_off;
564
565 chrp_init();
566
567 return 1;
568 }
569
define_machine(chrp)570 define_machine(chrp) {
571 .name = "CHRP",
572 .probe = chrp_probe,
573 .setup_arch = chrp_setup_arch,
574 .discover_phbs = chrp_find_bridges,
575 .init = chrp_init2,
576 .show_cpuinfo = chrp_show_cpuinfo,
577 .init_IRQ = chrp_init_IRQ,
578 .restart = rtas_restart,
579 .halt = rtas_halt,
580 .time_init = chrp_time_init,
581 .set_rtc_time = chrp_set_rtc_time,
582 .get_rtc_time = chrp_get_rtc_time,
583 .calibrate_decr = generic_calibrate_decr,
584 .phys_mem_access_prot = pci_phys_mem_access_prot,
585 };
586