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 #ifdef CONFIG_64BIT
104 extern int parisc_narrow_firmware;
105 #endif
106 unwind_init();
107
108 init_per_cpu(smp_processor_id()); /* Set Modes & Enable FP */
109
110 #ifdef CONFIG_64BIT
111 printk(KERN_INFO "The 64-bit Kernel has started...\n");
112 #else
113 printk(KERN_INFO "The 32-bit Kernel has started...\n");
114 #endif
115
116 printk(KERN_INFO "Kernel default page size is %d KB. Huge pages ",
117 (int)(PAGE_SIZE / 1024));
118 #ifdef CONFIG_HUGETLB_PAGE
119 printk(KERN_CONT "enabled with %d MB physical and %d MB virtual size",
120 1 << (REAL_HPAGE_SHIFT - 20), 1 << (HPAGE_SHIFT - 20));
121 #else
122 printk(KERN_CONT "disabled");
123 #endif
124 printk(KERN_CONT ".\n");
125
126 /*
127 * Check if initial kernel page mappings are sufficient.
128 * panic early if not, else we may access kernel functions
129 * and variables which can't be reached.
130 */
131 if (__pa((unsigned long) &_end) >= KERNEL_INITIAL_SIZE)
132 panic("KERNEL_INITIAL_ORDER too small!");
133
134 #ifdef CONFIG_64BIT
135 if(parisc_narrow_firmware) {
136 printk(KERN_INFO "Kernel is using PDC in 32-bit mode.\n");
137 }
138 #endif
139 setup_pdc();
140 setup_cmdline(cmdline_p);
141 collect_boot_cpu_data();
142 do_memory_inventory(); /* probe for physical memory */
143 parisc_cache_init();
144 paging_init();
145
146 #ifdef CONFIG_PA11
147 dma_ops_init();
148 #endif
149
150 clear_sched_clock_stable();
151 }
152
153 /*
154 * Display CPU info for all CPUs.
155 */
156 static void *
c_start(struct seq_file * m,loff_t * pos)157 c_start (struct seq_file *m, loff_t *pos)
158 {
159 /* Looks like the caller will call repeatedly until we return
160 * 0, signaling EOF perhaps. This could be used to sequence
161 * through CPUs for example. Since we print all cpu info in our
162 * show_cpuinfo() disregarding 'pos' (which I assume is 'v' above)
163 * we only allow for one "position". */
164 return ((long)*pos < 1) ? (void *)1 : NULL;
165 }
166
167 static void *
c_next(struct seq_file * m,void * v,loff_t * pos)168 c_next (struct seq_file *m, void *v, loff_t *pos)
169 {
170 ++*pos;
171 return c_start(m, pos);
172 }
173
174 static void
c_stop(struct seq_file * m,void * v)175 c_stop (struct seq_file *m, void *v)
176 {
177 }
178
179 const struct seq_operations cpuinfo_op = {
180 .start = c_start,
181 .next = c_next,
182 .stop = c_stop,
183 .show = show_cpuinfo
184 };
185
186 static struct resource central_bus = {
187 .name = "Central Bus",
188 .start = F_EXTEND(0xfff80000),
189 .end = F_EXTEND(0xfffaffff),
190 .flags = IORESOURCE_MEM,
191 };
192
193 static struct resource local_broadcast = {
194 .name = "Local Broadcast",
195 .start = F_EXTEND(0xfffb0000),
196 .end = F_EXTEND(0xfffdffff),
197 .flags = IORESOURCE_MEM,
198 };
199
200 static struct resource global_broadcast = {
201 .name = "Global Broadcast",
202 .start = F_EXTEND(0xfffe0000),
203 .end = F_EXTEND(0xffffffff),
204 .flags = IORESOURCE_MEM,
205 };
206
parisc_init_resources(void)207 static int __init parisc_init_resources(void)
208 {
209 int result;
210
211 result = request_resource(&iomem_resource, ¢ral_bus);
212 if (result < 0) {
213 printk(KERN_ERR
214 "%s: failed to claim %s address space!\n",
215 __FILE__, central_bus.name);
216 return result;
217 }
218
219 result = request_resource(&iomem_resource, &local_broadcast);
220 if (result < 0) {
221 printk(KERN_ERR
222 "%s: failed to claim %s address space!\n",
223 __FILE__, local_broadcast.name);
224 return result;
225 }
226
227 result = request_resource(&iomem_resource, &global_broadcast);
228 if (result < 0) {
229 printk(KERN_ERR
230 "%s: failed to claim %s address space!\n",
231 __FILE__, global_broadcast.name);
232 return result;
233 }
234
235 return 0;
236 }
237
parisc_init(void)238 static int __init parisc_init(void)
239 {
240 u32 osid = (OS_ID_LINUX << 16);
241
242 parisc_init_resources();
243 do_device_inventory(); /* probe for hardware */
244
245 parisc_pdc_chassis_init();
246
247 /* set up a new led state on systems shipped LED State panel */
248 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BSTART);
249
250 /* tell PDC we're Linux. Nevermind failure. */
251 pdc_stable_write(0x40, &osid, sizeof(osid));
252
253 /* start with known state */
254 flush_cache_all_local();
255 flush_tlb_all_local(NULL);
256
257 processor_init();
258 #ifdef CONFIG_SMP
259 pr_info("CPU(s): %d out of %d %s at %d.%06d MHz online\n",
260 num_online_cpus(), num_present_cpus(),
261 #else
262 pr_info("CPU(s): 1 x %s at %d.%06d MHz\n",
263 #endif
264 boot_cpu_data.cpu_name,
265 boot_cpu_data.cpu_hz / 1000000,
266 boot_cpu_data.cpu_hz % 1000000 );
267
268 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
269 /* Don't serialize TLB flushes if we run on one CPU only. */
270 if (num_online_cpus() == 1)
271 pa_serialize_tlb_flushes = 0;
272 #endif
273
274 apply_alternatives_all();
275 parisc_setup_cache_timing();
276 return 0;
277 }
278 arch_initcall(parisc_init);
279
start_parisc(void)280 void __init start_parisc(void)
281 {
282 int ret, cpunum;
283 struct pdc_coproc_cfg coproc_cfg;
284
285 /* check QEMU/SeaBIOS marker in PAGE0 */
286 running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0);
287
288 cpunum = smp_processor_id();
289
290 init_cpu_topology();
291
292 set_firmware_width_unlocked();
293
294 ret = pdc_coproc_cfg_unlocked(&coproc_cfg);
295 if (ret >= 0 && coproc_cfg.ccr_functional) {
296 mtctl(coproc_cfg.ccr_functional, 10);
297
298 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
299 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
300
301 asm volatile ("fstd %fr0,8(%sp)");
302 } else {
303 panic("must have an fpu to boot linux");
304 }
305
306 early_trap_init(); /* initialize checksum of fault_vector */
307
308 start_kernel();
309 // not reached
310 }
311