1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
4 */
5
6 #include <linux/init.h>
7 #include <linux/kernel.h>
8 #include <linux/linkage.h>
9 #include <linux/mm.h>
10 #include <linux/memblock.h>
11 #include <linux/pm.h>
12 #include <linux/smp.h>
13
14 #include <asm/bootinfo.h>
15 #include <asm/reboot.h>
16 #include <asm/setup.h>
17 #include <asm/sibyte/board.h>
18 #include <asm/smp-ops.h>
19
20 #include <asm/fw/cfe/cfe_api.h>
21 #include <asm/fw/cfe/cfe_error.h>
22
23 /* Max ram addressable in 32-bit segments */
24 #ifdef CONFIG_64BIT
25 #define MAX_RAM_SIZE (~0ULL)
26 #else
27 #ifdef CONFIG_HIGHMEM
28 #ifdef CONFIG_PHYS_ADDR_T_64BIT
29 #define MAX_RAM_SIZE (~0ULL)
30 #else
31 #define MAX_RAM_SIZE (0xffffffffULL)
32 #endif
33 #else
34 #define MAX_RAM_SIZE (0x1fffffffULL)
35 #endif
36 #endif
37
38 int cfe_cons_handle;
39
40 #ifdef CONFIG_BLK_DEV_INITRD
41 extern unsigned long initrd_start, initrd_end;
42 #endif
43
44 static void __noreturn cfe_linux_exit(void *arg)
45 {
46 int warm = *(int *)arg;
47
48 if (smp_processor_id()) {
49 static int reboot_smp;
50
51 /* Don't repeat the process from another CPU */
52 if (!reboot_smp) {
53 /* Get CPU 0 to do the cfe_exit */
54 reboot_smp = 1;
55 smp_call_function(cfe_linux_exit, arg, 0);
56 }
57 } else {
58 printk("Passing control back to CFE...\n");
59 cfe_exit(warm, 0);
60 printk("cfe_exit returned??\n");
61 }
62 while (1);
63 }
64
65 static void __noreturn cfe_linux_restart(char *command)
66 {
67 static const int zero;
68
69 cfe_linux_exit((void *)&zero);
70 }
71
72 static void __noreturn cfe_linux_halt(void)
73 {
74 static const int one = 1;
75
76 cfe_linux_exit((void *)&one);
77 }
78
79 static __init void prom_meminit(void)
80 {
81 u64 addr, size, type; /* regardless of PHYS_ADDR_T_64BIT */
82 int mem_flags = 0;
83 unsigned int idx;
84 int rd_flag;
85 #ifdef CONFIG_BLK_DEV_INITRD
86 unsigned long initrd_pstart;
87 unsigned long initrd_pend;
88
89 initrd_pstart = CPHYSADDR(initrd_start);
90 initrd_pend = CPHYSADDR(initrd_end);
91 if (initrd_start &&
92 ((initrd_pstart > MAX_RAM_SIZE)
93 || (initrd_pend > MAX_RAM_SIZE))) {
94 panic("initrd out of addressable memory");
95 }
96
97 #endif /* INITRD */
98
99 for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
100 idx++) {
101 rd_flag = 0;
102 if (type == CFE_MI_AVAILABLE) {
103 /*
104 * See if this block contains (any portion of) the
105 * ramdisk
106 */
107 #ifdef CONFIG_BLK_DEV_INITRD
108 if (initrd_start) {
109 if ((initrd_pstart > addr) &&
110 (initrd_pstart < (addr + size))) {
111 memblock_add(addr,
112 initrd_pstart - addr);
113 rd_flag = 1;
114 }
115 if ((initrd_pend > addr) &&
116 (initrd_pend < (addr + size))) {
117 memblock_add(initrd_pend,
118 (addr + size) - initrd_pend);
119 rd_flag = 1;
120 }
121 }
122 #endif
123 if (!rd_flag) {
124 if (addr > MAX_RAM_SIZE)
125 continue;
126 if (addr+size > MAX_RAM_SIZE)
127 size = MAX_RAM_SIZE - (addr+size) + 1;
128 /*
129 * memcpy/__copy_user prefetch, which
130 * will cause a bus error for
131 * KSEG/KUSEG addrs not backed by RAM.
132 * Hence, reserve some padding for the
133 * prefetch distance.
134 */
135 if (size > 512)
136 size -= 512;
137 memblock_add(addr, size);
138 }
139 }
140 }
141 #ifdef CONFIG_BLK_DEV_INITRD
142 if (initrd_start) {
143 memblock_add(initrd_pstart, initrd_pend - initrd_pstart);
144 memblock_reserve(initrd_pstart, initrd_pend - initrd_pstart);
145 }
146 #endif
147 }
148
149 #ifdef CONFIG_BLK_DEV_INITRD
150 static int __init initrd_setup(char *str)
151 {
152 char rdarg[64];
153 int idx;
154 char *tmp, *endptr;
155 unsigned long initrd_size;
156
157 /* Make a copy of the initrd argument so we can smash it up here */
158 for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
159 if (!str[idx] || (str[idx] == ' ')) break;
160 rdarg[idx] = str[idx];
161 }
162
163 rdarg[idx] = 0;
164 str = rdarg;
165
166 /*
167 *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
168 * e.g. initrd=3abfd@80010000. This is set up by the loader.
169 */
170 for (tmp = str; *tmp != '@'; tmp++) {
171 if (!*tmp) {
172 goto fail;
173 }
174 }
175 *tmp = 0;
176 tmp++;
177 if (!*tmp) {
178 goto fail;
179 }
180 initrd_size = simple_strtoul(str, &endptr, 16);
181 if (*endptr) {
182 *(tmp-1) = '@';
183 goto fail;
184 }
185 *(tmp-1) = '@';
186 initrd_start = simple_strtoul(tmp, &endptr, 16);
187 if (*endptr) {
188 goto fail;
189 }
190 initrd_end = initrd_start + initrd_size;
191 printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
192 return 1;
193 fail:
194 printk("Bad initrd argument. Disabling initrd\n");
195 initrd_start = 0;
196 initrd_end = 0;
197 return 1;
198 }
199
200 #endif
201
202 extern const struct plat_smp_ops sb_smp_ops;
203 extern const struct plat_smp_ops bcm1480_smp_ops;
204
205 /*
206 * prom_init is called just after the cpu type is determined, from setup_arch()
207 */
208 void __init prom_init(void)
209 {
210 uint64_t cfe_ept, cfe_handle;
211 unsigned int cfe_eptseal;
212 int argc = fw_arg0;
213 char **envp = (char **) fw_arg2;
214 int *prom_vec = (int *) fw_arg3;
215
216 _machine_restart = cfe_linux_restart;
217 _machine_halt = cfe_linux_halt;
218 pm_power_off = cfe_linux_halt;
219
220 /*
221 * Check if a loader was used; if NOT, the 4 arguments are
222 * what CFE gives us (handle, 0, EPT and EPTSEAL)
223 */
224 if (argc < 0) {
225 cfe_handle = (uint64_t)(long)argc;
226 cfe_ept = (long)envp;
227 cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
228 } else {
229 if ((int32_t)(long)prom_vec < 0) {
230 /*
231 * Old loader; all it gives us is the handle,
232 * so use the "known" entrypoint and assume
233 * the seal.
234 */
235 cfe_handle = (uint64_t)(long)prom_vec;
236 cfe_ept = (uint64_t)((int32_t)0x9fc00500);
237 cfe_eptseal = CFE_EPTSEAL;
238 } else {
239 /*
240 * Newer loaders bundle the handle/ept/eptseal
241 * Note: prom_vec is in the loader's useg
242 * which is still alive in the TLB.
243 */
244 cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
245 cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
246 cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
247 }
248 }
249 if (cfe_eptseal != CFE_EPTSEAL) {
250 /* too early for panic to do any good */
251 printk("CFE's entrypoint seal doesn't match. Spinning.");
252 while (1) ;
253 }
254 cfe_init(cfe_handle, cfe_ept);
255 /*
256 * Get the handle for (at least) prom_putchar, possibly for
257 * boot console
258 */
259 cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
260 if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
261 if (argc >= 0) {
262 /* The loader should have set the command line */
263 /* too early for panic to do any good */
264 printk("LINUX_CMDLINE not defined in cfe.");
265 while (1) ;
266 }
267 }
268
269 #ifdef CONFIG_BLK_DEV_INITRD
270 {
271 char *ptr;
272 /* Need to find out early whether we've got an initrd. So scan
273 the list looking now */
274 for (ptr = arcs_cmdline; *ptr; ptr++) {
275 while (*ptr == ' ') {
276 ptr++;
277 }
278 if (!strncmp(ptr, "initrd=", 7)) {
279 initrd_setup(ptr+7);
280 break;
281 } else {
282 while (*ptr && (*ptr != ' ')) {
283 ptr++;
284 }
285 }
286 }
287 }
288 #endif /* CONFIG_BLK_DEV_INITRD */
289
290 /* Not sure this is needed, but it's the safe way. */
291 arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;
292
293 prom_meminit();
294
295 #if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
296 register_smp_ops(&sb_smp_ops);
297 #endif
298 #ifdef CONFIG_SIBYTE_BCM1x80
299 register_smp_ops(&bcm1480_smp_ops);
300 #endif
301 }
302
303 void prom_putchar(char c)
304 {
305 int ret;
306
307 while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
308 ;
309 }
310
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