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/pdc_chassis.h>
35 #include <asm/io.h>
36 #include <asm/setup.h>
37 #include <asm/unwind.h>
38 #include <asm/smp.h>
39
40 static char __initdata command_line[COMMAND_LINE_SIZE];
41
setup_cmdline(char ** cmdline_p)42 static void __init setup_cmdline(char **cmdline_p)
43 {
44 extern unsigned int boot_args[];
45 char *p;
46
47 *cmdline_p = command_line;
48
49 /* boot_args[0] is free-mem start, boot_args[1] is ptr to command line */
50 if (boot_args[0] < 64)
51 return; /* return if called from hpux boot loader */
52
53 /* Collect stuff passed in from the boot loader */
54 strscpy(boot_command_line, (char *)__va(boot_args[1]),
55 COMMAND_LINE_SIZE);
56
57 /* autodetect console type (if not done by palo yet) */
58 p = boot_command_line;
59 if (!str_has_prefix(p, "console=") && !strstr(p, " console=")) {
60 strlcat(p, " console=", COMMAND_LINE_SIZE);
61 if (PAGE0->mem_cons.cl_class == CL_DUPLEX)
62 strlcat(p, "ttyS0", COMMAND_LINE_SIZE);
63 else
64 strlcat(p, "tty0", COMMAND_LINE_SIZE);
65 }
66
67 /* default to use early console */
68 if (!strstr(p, "earlycon"))
69 strlcat(p, " earlycon=pdc", COMMAND_LINE_SIZE);
70
71 #ifdef CONFIG_BLK_DEV_INITRD
72 /* did palo pass us a ramdisk? */
73 if (boot_args[2] != 0) {
74 initrd_start = (unsigned long)__va(boot_args[2]);
75 initrd_end = (unsigned long)__va(boot_args[3]);
76 }
77 #endif
78
79 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
80 }
81
82 #ifdef CONFIG_PA11
dma_ops_init(void)83 static void __init dma_ops_init(void)
84 {
85 switch (boot_cpu_data.cpu_type) {
86 case pcx:
87 /*
88 * We've got way too many dependencies on 1.1 semantics
89 * to support 1.0 boxes at this point.
90 */
91 panic( "PA-RISC Linux currently only supports machines that conform to\n"
92 "the PA-RISC 1.1 or 2.0 architecture specification.\n");
93
94 case pcxl2:
95 default:
96 break;
97 }
98 }
99 #endif
100
setup_arch(char ** cmdline_p)101 void __init setup_arch(char **cmdline_p)
102 {
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 #ifdef CONFIG_64BIT
124 if(parisc_narrow_firmware) {
125 printk(KERN_INFO "Kernel is using PDC in 32-bit mode.\n");
126 }
127 #endif
128 setup_pdc();
129 setup_cmdline(cmdline_p);
130 collect_boot_cpu_data();
131 do_memory_inventory(); /* probe for physical memory */
132 parisc_cache_init();
133 paging_init();
134
135 /*
136 * Parse early parameters before mm_core_init_early() runs.
137 * Several early_param() handlers only record data that is consumed
138 * from there - for example hugepages=, hugepagesz=,
139 * default_hugepagesz=, hugetlb_cma= and hugetlb_free_vmemmap= - so
140 * the generic parse_early_param() call in start_kernel() is too late
141 * for them. jump_label_init() must come first, since early param
142 * handlers may enable or disable static keys.
143 */
144 jump_label_init();
145 parse_early_param();
146
147 #ifdef CONFIG_PA11
148 dma_ops_init();
149 #endif
150
151 clear_sched_clock_stable();
152 }
153
154 /*
155 * Display CPU info for all CPUs.
156 */
157 static void *
c_start(struct seq_file * m,loff_t * pos)158 c_start (struct seq_file *m, loff_t *pos)
159 {
160 /* Looks like the caller will call repeatedly until we return
161 * 0, signaling EOF perhaps. This could be used to sequence
162 * through CPUs for example. Since we print all cpu info in our
163 * show_cpuinfo() disregarding 'pos' (which I assume is 'v' above)
164 * we only allow for one "position". */
165 return ((long)*pos < 1) ? (void *)1 : NULL;
166 }
167
168 static void *
c_next(struct seq_file * m,void * v,loff_t * pos)169 c_next (struct seq_file *m, void *v, loff_t *pos)
170 {
171 ++*pos;
172 return c_start(m, pos);
173 }
174
175 static void
c_stop(struct seq_file * m,void * v)176 c_stop (struct seq_file *m, void *v)
177 {
178 }
179
180 const struct seq_operations cpuinfo_op = {
181 .start = c_start,
182 .next = c_next,
183 .stop = c_stop,
184 .show = show_cpuinfo
185 };
186
187 static struct resource central_bus = {
188 .name = "Central Bus",
189 .start = F_EXTEND(0xfff80000),
190 .end = F_EXTEND(0xfffaffff),
191 .flags = IORESOURCE_MEM,
192 };
193
194 static struct resource local_broadcast = {
195 .name = "Local Broadcast",
196 .start = F_EXTEND(0xfffb0000),
197 .end = F_EXTEND(0xfffdffff),
198 .flags = IORESOURCE_MEM,
199 };
200
201 static struct resource global_broadcast = {
202 .name = "Global Broadcast",
203 .start = F_EXTEND(0xfffe0000),
204 .end = F_EXTEND(0xffffffff),
205 .flags = IORESOURCE_MEM,
206 };
207
parisc_init_resources(void)208 static int __init parisc_init_resources(void)
209 {
210 int result;
211
212 result = request_resource(&iomem_resource, ¢ral_bus);
213 if (result < 0) {
214 printk(KERN_ERR
215 "%s: failed to claim %s address space!\n",
216 __FILE__, central_bus.name);
217 return result;
218 }
219
220 result = request_resource(&iomem_resource, &local_broadcast);
221 if (result < 0) {
222 printk(KERN_ERR
223 "%s: failed to claim %s address space!\n",
224 __FILE__, local_broadcast.name);
225 return result;
226 }
227
228 result = request_resource(&iomem_resource, &global_broadcast);
229 if (result < 0) {
230 printk(KERN_ERR
231 "%s: failed to claim %s address space!\n",
232 __FILE__, global_broadcast.name);
233 return result;
234 }
235
236 return 0;
237 }
238
parisc_init(void)239 static int __init parisc_init(void)
240 {
241 u32 osid = (OS_ID_LINUX << 16);
242
243 parisc_init_resources();
244 do_device_inventory(); /* probe for hardware */
245
246 parisc_pdc_chassis_init();
247
248 /* set up a new led state on systems shipped LED State panel */
249 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BSTART);
250
251 /* tell PDC we're Linux. Nevermind failure. */
252 pdc_stable_write(0x40, &osid, sizeof(osid));
253
254 /* start with known state */
255 flush_cache_all_local();
256 flush_tlb_all_local(NULL);
257
258 processor_init();
259 #ifdef CONFIG_SMP
260 pr_info("CPU(s): %d out of %d %s at %d.%06d MHz online\n",
261 num_online_cpus(), num_present_cpus(),
262 #else
263 pr_info("CPU(s): 1 x %s at %d.%06d MHz\n",
264 #endif
265 boot_cpu_data.cpu_name,
266 boot_cpu_data.cpu_hz / 1000000,
267 boot_cpu_data.cpu_hz % 1000000 );
268
269 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
270 /* Don't serialize TLB flushes if we run on one CPU only. */
271 if (num_online_cpus() == 1)
272 pa_serialize_tlb_flushes = 0;
273 #endif
274
275 apply_alternatives_all();
276 parisc_setup_cache_timing();
277 return 0;
278 }
279 arch_initcall(parisc_init);
280
start_parisc(void)281 void __init start_parisc(void)
282 {
283 int ret, cpunum;
284 struct pdc_coproc_cfg coproc_cfg;
285
286 /*
287 * Check if initial kernel page mapping is sufficient.
288 * Print warning if not, because we may access kernel functions and
289 * variables which can't be reached yet through the initial mappings.
290 * Note that the panic() and printk() functions are not functional
291 * yet, so we need to use direct iodc() firmware calls instead.
292 */
293 const char warn1[] = "CRITICAL: Kernel may crash because "
294 "KERNEL_INITIAL_ORDER is too small.\n";
295 if (__pa((unsigned long) &_end) >= KERNEL_INITIAL_SIZE)
296 pdc_iodc_print(warn1, sizeof(warn1) - 1);
297
298 /* check QEMU/SeaBIOS marker in PAGE0 */
299 running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0);
300
301 cpunum = smp_processor_id();
302
303 init_cpu_topology();
304
305 set_firmware_width_unlocked();
306
307 ret = pdc_coproc_cfg_unlocked(&coproc_cfg);
308 if (ret >= 0 && coproc_cfg.ccr_functional) {
309 mtctl(coproc_cfg.ccr_functional, 10);
310
311 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
312 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
313
314 asm volatile ("fstd %fr0,8(%sp)");
315 } else {
316 panic("must have an fpu to boot linux");
317 }
318
319 early_trap_init(); /* initialize checksum of fault_vector */
320
321 start_kernel();
322 // not reached
323 }
324