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 /*
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 #ifdef CONFIG_64BIT
132 if(parisc_narrow_firmware) {
133 printk(KERN_INFO "Kernel is using PDC in 32-bit mode.\n");
134 }
135 #endif
136 setup_pdc();
137 setup_cmdline(cmdline_p);
138 collect_boot_cpu_data();
139 do_memory_inventory(); /* probe for physical memory */
140 parisc_cache_init();
141 paging_init();
142
143 #ifdef CONFIG_PA11
144 dma_ops_init();
145 #endif
146
147 clear_sched_clock_stable();
148 }
149
150 /*
151 * Display CPU info for all CPUs.
152 */
153 static void *
c_start(struct seq_file * m,loff_t * pos)154 c_start (struct seq_file *m, loff_t *pos)
155 {
156 /* Looks like the caller will call repeatedly until we return
157 * 0, signaling EOF perhaps. This could be used to sequence
158 * through CPUs for example. Since we print all cpu info in our
159 * show_cpuinfo() disregarding 'pos' (which I assume is 'v' above)
160 * we only allow for one "position". */
161 return ((long)*pos < 1) ? (void *)1 : NULL;
162 }
163
164 static void *
c_next(struct seq_file * m,void * v,loff_t * pos)165 c_next (struct seq_file *m, void *v, loff_t *pos)
166 {
167 ++*pos;
168 return c_start(m, pos);
169 }
170
171 static void
c_stop(struct seq_file * m,void * v)172 c_stop (struct seq_file *m, void *v)
173 {
174 }
175
176 const struct seq_operations cpuinfo_op = {
177 .start = c_start,
178 .next = c_next,
179 .stop = c_stop,
180 .show = show_cpuinfo
181 };
182
183 static struct resource central_bus = {
184 .name = "Central Bus",
185 .start = F_EXTEND(0xfff80000),
186 .end = F_EXTEND(0xfffaffff),
187 .flags = IORESOURCE_MEM,
188 };
189
190 static struct resource local_broadcast = {
191 .name = "Local Broadcast",
192 .start = F_EXTEND(0xfffb0000),
193 .end = F_EXTEND(0xfffdffff),
194 .flags = IORESOURCE_MEM,
195 };
196
197 static struct resource global_broadcast = {
198 .name = "Global Broadcast",
199 .start = F_EXTEND(0xfffe0000),
200 .end = F_EXTEND(0xffffffff),
201 .flags = IORESOURCE_MEM,
202 };
203
parisc_init_resources(void)204 static int __init parisc_init_resources(void)
205 {
206 int result;
207
208 result = request_resource(&iomem_resource, ¢ral_bus);
209 if (result < 0) {
210 printk(KERN_ERR
211 "%s: failed to claim %s address space!\n",
212 __FILE__, central_bus.name);
213 return result;
214 }
215
216 result = request_resource(&iomem_resource, &local_broadcast);
217 if (result < 0) {
218 printk(KERN_ERR
219 "%s: failed to claim %s address space!\n",
220 __FILE__, local_broadcast.name);
221 return result;
222 }
223
224 result = request_resource(&iomem_resource, &global_broadcast);
225 if (result < 0) {
226 printk(KERN_ERR
227 "%s: failed to claim %s address space!\n",
228 __FILE__, global_broadcast.name);
229 return result;
230 }
231
232 return 0;
233 }
234
parisc_init(void)235 static int __init parisc_init(void)
236 {
237 u32 osid = (OS_ID_LINUX << 16);
238
239 parisc_init_resources();
240 do_device_inventory(); /* probe for hardware */
241
242 parisc_pdc_chassis_init();
243
244 /* set up a new led state on systems shipped LED State panel */
245 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BSTART);
246
247 /* tell PDC we're Linux. Nevermind failure. */
248 pdc_stable_write(0x40, &osid, sizeof(osid));
249
250 /* start with known state */
251 flush_cache_all_local();
252 flush_tlb_all_local(NULL);
253
254 processor_init();
255 #ifdef CONFIG_SMP
256 pr_info("CPU(s): %d out of %d %s at %d.%06d MHz online\n",
257 num_online_cpus(), num_present_cpus(),
258 #else
259 pr_info("CPU(s): 1 x %s at %d.%06d MHz\n",
260 #endif
261 boot_cpu_data.cpu_name,
262 boot_cpu_data.cpu_hz / 1000000,
263 boot_cpu_data.cpu_hz % 1000000 );
264
265 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
266 /* Don't serialize TLB flushes if we run on one CPU only. */
267 if (num_online_cpus() == 1)
268 pa_serialize_tlb_flushes = 0;
269 #endif
270
271 apply_alternatives_all();
272 parisc_setup_cache_timing();
273 return 0;
274 }
275 arch_initcall(parisc_init);
276
start_parisc(void)277 void __init start_parisc(void)
278 {
279 int ret, cpunum;
280 struct pdc_coproc_cfg coproc_cfg;
281
282 /* check QEMU/SeaBIOS marker in PAGE0 */
283 running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0);
284
285 cpunum = smp_processor_id();
286
287 init_cpu_topology();
288
289 set_firmware_width_unlocked();
290
291 ret = pdc_coproc_cfg_unlocked(&coproc_cfg);
292 if (ret >= 0 && coproc_cfg.ccr_functional) {
293 mtctl(coproc_cfg.ccr_functional, 10);
294
295 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
296 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
297
298 asm volatile ("fstd %fr0,8(%sp)");
299 } else {
300 panic("must have an fpu to boot linux");
301 }
302
303 early_trap_init(); /* initialize checksum of fault_vector */
304
305 start_kernel();
306 // not reached
307 }
308