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