2 * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/linkage.h>
23 #include <linux/blkdev.h>
24 #include <linux/bootmem.h>
26 #include <linux/smp.h>
28 #include <asm/bootinfo.h>
29 #include <asm/reboot.h>
30 #include <asm/setup.h>
31 #include <asm/sibyte/board.h>
32 #include <asm/smp-ops.h>
34 #include <asm/fw/cfe/cfe_api.h>
35 #include <asm/fw/cfe/cfe_error.h>
37 /* Max ram addressable in 32-bit segments */
39 #define MAX_RAM_SIZE (~0ULL)
42 #ifdef CONFIG_PHYS_ADDR_T_64BIT
43 #define MAX_RAM_SIZE (~0ULL)
45 #define MAX_RAM_SIZE (0xffffffffULL)
48 #define MAX_RAM_SIZE (0x1fffffffULL)
52 #define SIBYTE_MAX_MEM_REGIONS 8
53 phys_addr_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
54 phys_addr_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
55 unsigned int board_mem_region_count;
59 #ifdef CONFIG_BLK_DEV_INITRD
60 extern unsigned long initrd_start, initrd_end;
63 static void __noreturn cfe_linux_exit(void *arg)
65 int warm = *(int *)arg;
67 if (smp_processor_id()) {
68 static int reboot_smp;
70 /* Don't repeat the process from another CPU */
72 /* Get CPU 0 to do the cfe_exit */
74 smp_call_function(cfe_linux_exit, arg, 0);
77 printk("Passing control back to CFE...\n");
79 printk("cfe_exit returned??\n");
84 static void __noreturn cfe_linux_restart(char *command)
86 static const int zero;
88 cfe_linux_exit((void *)&zero);
91 static void __noreturn cfe_linux_halt(void)
93 static const int one = 1;
95 cfe_linux_exit((void *)&one);
98 static __init void prom_meminit(void)
100 u64 addr, size, type; /* regardless of PHYS_ADDR_T_64BIT */
104 #ifdef CONFIG_BLK_DEV_INITRD
105 unsigned long initrd_pstart;
106 unsigned long initrd_pend;
108 initrd_pstart = CPHYSADDR(initrd_start);
109 initrd_pend = CPHYSADDR(initrd_end);
111 ((initrd_pstart > MAX_RAM_SIZE)
112 || (initrd_pend > MAX_RAM_SIZE))) {
113 panic("initrd out of addressable memory");
118 for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
121 if (type == CFE_MI_AVAILABLE) {
123 * See if this block contains (any portion of) the
126 #ifdef CONFIG_BLK_DEV_INITRD
128 if ((initrd_pstart > addr) &&
129 (initrd_pstart < (addr + size))) {
130 add_memory_region(addr,
131 initrd_pstart - addr,
135 if ((initrd_pend > addr) &&
136 (initrd_pend < (addr + size))) {
137 add_memory_region(initrd_pend,
138 (addr + size) - initrd_pend,
145 if (addr > MAX_RAM_SIZE)
147 if (addr+size > MAX_RAM_SIZE)
148 size = MAX_RAM_SIZE - (addr+size) + 1;
150 * memcpy/__copy_user prefetch, which
151 * will cause a bus error for
152 * KSEG/KUSEG addrs not backed by RAM.
153 * Hence, reserve some padding for the
158 add_memory_region(addr, size, BOOT_MEM_RAM);
160 board_mem_region_addrs[board_mem_region_count] = addr;
161 board_mem_region_sizes[board_mem_region_count] = size;
162 board_mem_region_count++;
163 if (board_mem_region_count ==
164 SIBYTE_MAX_MEM_REGIONS) {
166 * Too many regions. Need to configure more
172 #ifdef CONFIG_BLK_DEV_INITRD
174 add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
180 #ifdef CONFIG_BLK_DEV_INITRD
181 static int __init initrd_setup(char *str)
186 unsigned long initrd_size;
188 /* Make a copy of the initrd argument so we can smash it up here */
189 for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
190 if (!str[idx] || (str[idx] == ' ')) break;
191 rdarg[idx] = str[idx];
198 *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
199 * e.g. initrd=3abfd@80010000. This is set up by the loader.
201 for (tmp = str; *tmp != '@'; tmp++) {
211 initrd_size = simple_strtoul(str, &endptr, 16);
217 initrd_start = simple_strtoul(tmp, &endptr, 16);
221 initrd_end = initrd_start + initrd_size;
222 printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
225 printk("Bad initrd argument. Disabling initrd\n");
233 extern const struct plat_smp_ops sb_smp_ops;
234 extern const struct plat_smp_ops bcm1480_smp_ops;
237 * prom_init is called just after the cpu type is determined, from setup_arch()
239 void __init prom_init(void)
241 uint64_t cfe_ept, cfe_handle;
242 unsigned int cfe_eptseal;
244 char **envp = (char **) fw_arg2;
245 int *prom_vec = (int *) fw_arg3;
247 _machine_restart = cfe_linux_restart;
248 _machine_halt = cfe_linux_halt;
249 pm_power_off = cfe_linux_halt;
252 * Check if a loader was used; if NOT, the 4 arguments are
253 * what CFE gives us (handle, 0, EPT and EPTSEAL)
256 cfe_handle = (uint64_t)(long)argc;
257 cfe_ept = (long)envp;
258 cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
260 if ((int32_t)(long)prom_vec < 0) {
262 * Old loader; all it gives us is the handle,
263 * so use the "known" entrypoint and assume
266 cfe_handle = (uint64_t)(long)prom_vec;
267 cfe_ept = (uint64_t)((int32_t)0x9fc00500);
268 cfe_eptseal = CFE_EPTSEAL;
271 * Newer loaders bundle the handle/ept/eptseal
272 * Note: prom_vec is in the loader's useg
273 * which is still alive in the TLB.
275 cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
276 cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
277 cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
280 if (cfe_eptseal != CFE_EPTSEAL) {
281 /* too early for panic to do any good */
282 printk("CFE's entrypoint seal doesn't match. Spinning.");
285 cfe_init(cfe_handle, cfe_ept);
287 * Get the handle for (at least) prom_putchar, possibly for
290 cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
291 if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
293 /* The loader should have set the command line */
294 /* too early for panic to do any good */
295 printk("LINUX_CMDLINE not defined in cfe.");
300 #ifdef CONFIG_BLK_DEV_INITRD
303 /* Need to find out early whether we've got an initrd. So scan
304 the list looking now */
305 for (ptr = arcs_cmdline; *ptr; ptr++) {
306 while (*ptr == ' ') {
309 if (!strncmp(ptr, "initrd=", 7)) {
313 while (*ptr && (*ptr != ' ')) {
319 #endif /* CONFIG_BLK_DEV_INITRD */
321 /* Not sure this is needed, but it's the safe way. */
322 arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;
326 #if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
327 register_smp_ops(&sb_smp_ops);
329 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
330 register_smp_ops(&bcm1480_smp_ops);
334 void __init prom_free_prom_memory(void)
336 /* Not sure what I'm supposed to do here. Nothing, I think */
339 void prom_putchar(char c)
343 while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)