1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Initial setup-routines for HP 9000 based hardware.
4 *
5 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
6 * Modifications for PA-RISC (C) 1999 Helge Deller <deller@gmx.de>
7 * Modifications copyright 1999 SuSE GmbH (Philipp Rumpf)
8 * Modifications copyright 2000 Martin K. Petersen <mkp@mkp.net>
9 * Modifications copyright 2000 Philipp Rumpf <prumpf@tux.org>
10 * Modifications copyright 2001 Ryan Bradetich <rbradetich@uswest.net>
11 *
12 * Initial PA-RISC Version: 04-23-1999 by Helge Deller
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/initrd.h>
17 #include <linux/init.h>
18 #include <linux/console.h>
19 #include <linux/seq_file.h>
20 #define PCI_DEBUG
21 #include <linux/pci.h>
22 #undef PCI_DEBUG
23 #include <linux/proc_fs.h>
24 #include <linux/export.h>
25 #include <linux/sched.h>
26 #include <linux/sched/clock.h>
27 #include <linux/start_kernel.h>
28
29 #include <asm/cacheflush.h>
30 #include <asm/processor.h>
31 #include <asm/sections.h>
32 #include <asm/pdc.h>
33 #include <asm/led.h>
34 #include <asm/machdep.h> /* for pa7300lc_init() proto */
35 #include <asm/pdc_chassis.h>
36 #include <asm/io.h>
37 #include <asm/setup.h>
38 #include <asm/unwind.h>
39 #include <asm/smp.h>
40
41 static char __initdata command_line[COMMAND_LINE_SIZE];
42
43 /* Intended for ccio/sba/cpu statistics under /proc/bus/{runway|gsc} */
44 struct proc_dir_entry * proc_runway_root __read_mostly = NULL;
45 struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
46 struct proc_dir_entry * proc_mckinley_root __read_mostly = NULL;
47
setup_cmdline(char ** cmdline_p)48 void __init setup_cmdline(char **cmdline_p)
49 {
50 extern unsigned int boot_args[];
51 char *p;
52
53 /* Collect stuff passed in from the boot loader */
54
55 /* boot_args[0] is free-mem start, boot_args[1] is ptr to command line */
56 if (boot_args[0] < 64) {
57 /* called from hpux boot loader */
58 boot_command_line[0] = '\0';
59 } else {
60 strscpy(boot_command_line, (char *)__va(boot_args[1]),
61 COMMAND_LINE_SIZE);
62
63 /* autodetect console type (if not done by palo yet) */
64 p = boot_command_line;
65 if (!str_has_prefix(p, "console=") && !strstr(p, " console=")) {
66 strlcat(p, " console=", COMMAND_LINE_SIZE);
67 if (PAGE0->mem_cons.cl_class == CL_DUPLEX)
68 strlcat(p, "ttyS0", COMMAND_LINE_SIZE);
69 else
70 strlcat(p, "tty0", COMMAND_LINE_SIZE);
71 }
72
73 /* default to use early console */
74 if (!strstr(p, "earlycon"))
75 strlcat(p, " earlycon=pdc", COMMAND_LINE_SIZE);
76
77 #ifdef CONFIG_BLK_DEV_INITRD
78 if (boot_args[2] != 0) /* did palo pass us a ramdisk? */
79 {
80 initrd_start = (unsigned long)__va(boot_args[2]);
81 initrd_end = (unsigned long)__va(boot_args[3]);
82 }
83 #endif
84 }
85
86 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
87 *cmdline_p = command_line;
88 }
89
90 #ifdef CONFIG_PA11
dma_ops_init(void)91 void __init dma_ops_init(void)
92 {
93 switch (boot_cpu_data.cpu_type) {
94 case pcx:
95 /*
96 * We've got way too many dependencies on 1.1 semantics
97 * to support 1.0 boxes at this point.
98 */
99 panic( "PA-RISC Linux currently only supports machines that conform to\n"
100 "the PA-RISC 1.1 or 2.0 architecture specification.\n");
101
102 case pcxl2:
103 pa7300lc_init();
104 break;
105 default:
106 break;
107 }
108 }
109 #endif
110
111 extern void collect_boot_cpu_data(void);
112
setup_arch(char ** cmdline_p)113 void __init setup_arch(char **cmdline_p)
114 {
115 #ifdef CONFIG_64BIT
116 extern int parisc_narrow_firmware;
117 #endif
118 unwind_init();
119
120 init_per_cpu(smp_processor_id()); /* Set Modes & Enable FP */
121
122 #ifdef CONFIG_64BIT
123 printk(KERN_INFO "The 64-bit Kernel has started...\n");
124 #else
125 printk(KERN_INFO "The 32-bit Kernel has started...\n");
126 #endif
127
128 printk(KERN_INFO "Kernel default page size is %d KB. Huge pages ",
129 (int)(PAGE_SIZE / 1024));
130 #ifdef CONFIG_HUGETLB_PAGE
131 printk(KERN_CONT "enabled with %d MB physical and %d MB virtual size",
132 1 << (REAL_HPAGE_SHIFT - 20), 1 << (HPAGE_SHIFT - 20));
133 #else
134 printk(KERN_CONT "disabled");
135 #endif
136 printk(KERN_CONT ".\n");
137
138 /*
139 * Check if initial kernel page mappings are sufficient.
140 * panic early if not, else we may access kernel functions
141 * and variables which can't be reached.
142 */
143 if (__pa((unsigned long) &_end) >= KERNEL_INITIAL_SIZE)
144 panic("KERNEL_INITIAL_ORDER too small!");
145
146 #ifdef CONFIG_64BIT
147 if(parisc_narrow_firmware) {
148 printk(KERN_INFO "Kernel is using PDC in 32-bit mode.\n");
149 }
150 #endif
151 setup_pdc();
152 setup_cmdline(cmdline_p);
153 collect_boot_cpu_data();
154 do_memory_inventory(); /* probe for physical memory */
155 parisc_cache_init();
156 paging_init();
157
158 #ifdef CONFIG_CHASSIS_LCD_LED
159 /* initialize the LCD/LED after boot_cpu_data is available ! */
160 led_init(); /* LCD/LED initialization */
161 #endif
162
163 #ifdef CONFIG_PA11
164 dma_ops_init();
165 #endif
166
167 clear_sched_clock_stable();
168 }
169
170 /*
171 * Display CPU info for all CPUs.
172 * for parisc this is in processor.c
173 */
174 extern int show_cpuinfo (struct seq_file *m, void *v);
175
176 static void *
c_start(struct seq_file * m,loff_t * pos)177 c_start (struct seq_file *m, loff_t *pos)
178 {
179 /* Looks like the caller will call repeatedly until we return
180 * 0, signaling EOF perhaps. This could be used to sequence
181 * through CPUs for example. Since we print all cpu info in our
182 * show_cpuinfo() disregarding 'pos' (which I assume is 'v' above)
183 * we only allow for one "position". */
184 return ((long)*pos < 1) ? (void *)1 : NULL;
185 }
186
187 static void *
c_next(struct seq_file * m,void * v,loff_t * pos)188 c_next (struct seq_file *m, void *v, loff_t *pos)
189 {
190 ++*pos;
191 return c_start(m, pos);
192 }
193
194 static void
c_stop(struct seq_file * m,void * v)195 c_stop (struct seq_file *m, void *v)
196 {
197 }
198
199 const struct seq_operations cpuinfo_op = {
200 .start = c_start,
201 .next = c_next,
202 .stop = c_stop,
203 .show = show_cpuinfo
204 };
205
parisc_proc_mkdir(void)206 static void __init parisc_proc_mkdir(void)
207 {
208 /*
209 ** Can't call proc_mkdir() until after proc_root_init() has been
210 ** called by start_kernel(). In other words, this code can't
211 ** live in arch/.../setup.c because start_parisc() calls
212 ** start_kernel().
213 */
214 switch (boot_cpu_data.cpu_type) {
215 case pcxl:
216 case pcxl2:
217 if (NULL == proc_gsc_root)
218 {
219 proc_gsc_root = proc_mkdir("bus/gsc", NULL);
220 }
221 break;
222 case pcxt_:
223 case pcxu:
224 case pcxu_:
225 case pcxw:
226 case pcxw_:
227 case pcxw2:
228 if (NULL == proc_runway_root)
229 {
230 proc_runway_root = proc_mkdir("bus/runway", NULL);
231 }
232 break;
233 case mako:
234 case mako2:
235 if (NULL == proc_mckinley_root)
236 {
237 proc_mckinley_root = proc_mkdir("bus/mckinley", NULL);
238 }
239 break;
240 default:
241 /* FIXME: this was added to prevent the compiler
242 * complaining about missing pcx, pcxs and pcxt
243 * I'm assuming they have neither gsc nor runway */
244 break;
245 }
246 }
247
248 static struct resource central_bus = {
249 .name = "Central Bus",
250 .start = F_EXTEND(0xfff80000),
251 .end = F_EXTEND(0xfffaffff),
252 .flags = IORESOURCE_MEM,
253 };
254
255 static struct resource local_broadcast = {
256 .name = "Local Broadcast",
257 .start = F_EXTEND(0xfffb0000),
258 .end = F_EXTEND(0xfffdffff),
259 .flags = IORESOURCE_MEM,
260 };
261
262 static struct resource global_broadcast = {
263 .name = "Global Broadcast",
264 .start = F_EXTEND(0xfffe0000),
265 .end = F_EXTEND(0xffffffff),
266 .flags = IORESOURCE_MEM,
267 };
268
parisc_init_resources(void)269 static int __init parisc_init_resources(void)
270 {
271 int result;
272
273 result = request_resource(&iomem_resource, ¢ral_bus);
274 if (result < 0) {
275 printk(KERN_ERR
276 "%s: failed to claim %s address space!\n",
277 __FILE__, central_bus.name);
278 return result;
279 }
280
281 result = request_resource(&iomem_resource, &local_broadcast);
282 if (result < 0) {
283 printk(KERN_ERR
284 "%s: failed to claim %s address space!\n",
285 __FILE__, local_broadcast.name);
286 return result;
287 }
288
289 result = request_resource(&iomem_resource, &global_broadcast);
290 if (result < 0) {
291 printk(KERN_ERR
292 "%s: failed to claim %s address space!\n",
293 __FILE__, global_broadcast.name);
294 return result;
295 }
296
297 return 0;
298 }
299
300 extern void gsc_init(void);
301 extern void processor_init(void);
302 extern void ccio_init(void);
303 extern void hppb_init(void);
304 extern void dino_init(void);
305 extern void iosapic_init(void);
306 extern void lba_init(void);
307 extern void sba_init(void);
308 extern void eisa_init(void);
309
parisc_init(void)310 static int __init parisc_init(void)
311 {
312 u32 osid = (OS_ID_LINUX << 16);
313
314 parisc_proc_mkdir();
315 parisc_init_resources();
316 do_device_inventory(); /* probe for hardware */
317
318 parisc_pdc_chassis_init();
319
320 /* set up a new led state on systems shipped LED State panel */
321 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BSTART);
322
323 /* tell PDC we're Linux. Nevermind failure. */
324 pdc_stable_write(0x40, &osid, sizeof(osid));
325
326 /* start with known state */
327 flush_cache_all_local();
328 flush_tlb_all_local(NULL);
329
330 processor_init();
331 #ifdef CONFIG_SMP
332 pr_info("CPU(s): %d out of %d %s at %d.%06d MHz online\n",
333 num_online_cpus(), num_present_cpus(),
334 #else
335 pr_info("CPU(s): 1 x %s at %d.%06d MHz\n",
336 #endif
337 boot_cpu_data.cpu_name,
338 boot_cpu_data.cpu_hz / 1000000,
339 boot_cpu_data.cpu_hz % 1000000 );
340
341 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
342 /* Don't serialize TLB flushes if we run on one CPU only. */
343 if (num_online_cpus() == 1)
344 pa_serialize_tlb_flushes = 0;
345 #endif
346
347 apply_alternatives_all();
348 parisc_setup_cache_timing();
349
350 /* These are in a non-obvious order, will fix when we have an iotree */
351 #if defined(CONFIG_IOSAPIC)
352 iosapic_init();
353 #endif
354 #if defined(CONFIG_IOMMU_SBA)
355 sba_init();
356 #endif
357 #if defined(CONFIG_PCI_LBA)
358 lba_init();
359 #endif
360
361 /* CCIO before any potential subdevices */
362 #if defined(CONFIG_IOMMU_CCIO)
363 ccio_init();
364 #endif
365
366 /*
367 * Need to register Asp & Wax before the EISA adapters for the IRQ
368 * regions. EISA must come before PCI to be sure it gets IRQ region
369 * 0.
370 */
371 #if defined(CONFIG_GSC_LASI) || defined(CONFIG_GSC_WAX)
372 gsc_init();
373 #endif
374 #ifdef CONFIG_EISA
375 eisa_init();
376 #endif
377
378 #if defined(CONFIG_HPPB)
379 hppb_init();
380 #endif
381
382 #if defined(CONFIG_GSC_DINO)
383 dino_init();
384 #endif
385
386 #ifdef CONFIG_CHASSIS_LCD_LED
387 register_led_regions(); /* register LED port info in procfs */
388 #endif
389
390 return 0;
391 }
392 arch_initcall(parisc_init);
393
start_parisc(void)394 void __init start_parisc(void)
395 {
396 extern void early_trap_init(void);
397
398 int ret, cpunum;
399 struct pdc_coproc_cfg coproc_cfg;
400
401 /* check QEMU/SeaBIOS marker in PAGE0 */
402 running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0);
403
404 cpunum = smp_processor_id();
405
406 init_cpu_topology();
407
408 set_firmware_width_unlocked();
409
410 ret = pdc_coproc_cfg_unlocked(&coproc_cfg);
411 if (ret >= 0 && coproc_cfg.ccr_functional) {
412 mtctl(coproc_cfg.ccr_functional, 10);
413
414 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
415 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
416
417 asm volatile ("fstd %fr0,8(%sp)");
418 } else {
419 panic("must have an fpu to boot linux");
420 }
421
422 early_trap_init(); /* initialize checksum of fault_vector */
423
424 start_kernel();
425 // not reached
426 }
427