1/*
2 * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
3 *
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.
8 *
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.
13 *
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.
17 */
18
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/linkage.h>
22#include <linux/mm.h>
23#include <linux/blkdev.h>
24#include <linux/bootmem.h>
25#include <linux/pm.h>
26#include <linux/smp.h>
27
28#include <asm/bootinfo.h>
29#include <asm/reboot.h>
30#include <asm/sibyte/board.h>
31#include <asm/smp-ops.h>
32
33#include <asm/fw/cfe/cfe_api.h>
34#include <asm/fw/cfe/cfe_error.h>
35
36/* Max ram addressable in 32-bit segments */
37#ifdef CONFIG_64BIT
38#define MAX_RAM_SIZE (~0ULL)
39#else
40#ifdef CONFIG_HIGHMEM
41#ifdef CONFIG_PHYS_ADDR_T_64BIT
42#define MAX_RAM_SIZE (~0ULL)
43#else
44#define MAX_RAM_SIZE (0xffffffffULL)
45#endif
46#else
47#define MAX_RAM_SIZE (0x1fffffffULL)
48#endif
49#endif
50
51#define SIBYTE_MAX_MEM_REGIONS 8
52phys_addr_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
53phys_addr_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
54unsigned int board_mem_region_count;
55
56int cfe_cons_handle;
57
58#ifdef CONFIG_BLK_DEV_INITRD
59extern unsigned long initrd_start, initrd_end;
60#endif
61
62static void __noreturn cfe_linux_exit(void *arg)
63{
64	int warm = *(int *)arg;
65
66	if (smp_processor_id()) {
67		static int reboot_smp;
68
69		/* Don't repeat the process from another CPU */
70		if (!reboot_smp) {
71			/* Get CPU 0 to do the cfe_exit */
72			reboot_smp = 1;
73			smp_call_function(cfe_linux_exit, arg, 0);
74		}
75	} else {
76		printk("Passing control back to CFE...\n");
77		cfe_exit(warm, 0);
78		printk("cfe_exit returned??\n");
79	}
80	while (1);
81}
82
83static void __noreturn cfe_linux_restart(char *command)
84{
85	static const int zero;
86
87	cfe_linux_exit((void *)&zero);
88}
89
90static void __noreturn cfe_linux_halt(void)
91{
92	static const int one = 1;
93
94	cfe_linux_exit((void *)&one);
95}
96
97static __init void prom_meminit(void)
98{
99	u64 addr, size, type; /* regardless of PHYS_ADDR_T_64BIT */
100	int mem_flags = 0;
101	unsigned int idx;
102	int rd_flag;
103#ifdef CONFIG_BLK_DEV_INITRD
104	unsigned long initrd_pstart;
105	unsigned long initrd_pend;
106
107	initrd_pstart = CPHYSADDR(initrd_start);
108	initrd_pend = CPHYSADDR(initrd_end);
109	if (initrd_start &&
110	    ((initrd_pstart > MAX_RAM_SIZE)
111	     || (initrd_pend > MAX_RAM_SIZE))) {
112		panic("initrd out of addressable memory");
113	}
114
115#endif /* INITRD */
116
117	for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
118	     idx++) {
119		rd_flag = 0;
120		if (type == CFE_MI_AVAILABLE) {
121			/*
122			 * See if this block contains (any portion of) the
123			 * ramdisk
124			 */
125#ifdef CONFIG_BLK_DEV_INITRD
126			if (initrd_start) {
127				if ((initrd_pstart > addr) &&
128				    (initrd_pstart < (addr + size))) {
129					add_memory_region(addr,
130							  initrd_pstart - addr,
131							  BOOT_MEM_RAM);
132					rd_flag = 1;
133				}
134				if ((initrd_pend > addr) &&
135				    (initrd_pend < (addr + size))) {
136					add_memory_region(initrd_pend,
137						(addr + size) - initrd_pend,
138						 BOOT_MEM_RAM);
139					rd_flag = 1;
140				}
141			}
142#endif
143			if (!rd_flag) {
144				if (addr > MAX_RAM_SIZE)
145					continue;
146				if (addr+size > MAX_RAM_SIZE)
147					size = MAX_RAM_SIZE - (addr+size) + 1;
148				/*
149				 * memcpy/__copy_user prefetch, which
150				 * will cause a bus error for
151				 * KSEG/KUSEG addrs not backed by RAM.
152				 * Hence, reserve some padding for the
153				 * prefetch distance.
154				 */
155				if (size > 512)
156					size -= 512;
157				add_memory_region(addr, size, BOOT_MEM_RAM);
158			}
159			board_mem_region_addrs[board_mem_region_count] = addr;
160			board_mem_region_sizes[board_mem_region_count] = size;
161			board_mem_region_count++;
162			if (board_mem_region_count ==
163			    SIBYTE_MAX_MEM_REGIONS) {
164				/*
165				 * Too many regions.  Need to configure more
166				 */
167				while(1);
168			}
169		}
170	}
171#ifdef CONFIG_BLK_DEV_INITRD
172	if (initrd_start) {
173		add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
174				  BOOT_MEM_RESERVED);
175	}
176#endif
177}
178
179#ifdef CONFIG_BLK_DEV_INITRD
180static int __init initrd_setup(char *str)
181{
182	char rdarg[64];
183	int idx;
184	char *tmp, *endptr;
185	unsigned long initrd_size;
186
187	/* Make a copy of the initrd argument so we can smash it up here */
188	for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
189		if (!str[idx] || (str[idx] == ' ')) break;
190		rdarg[idx] = str[idx];
191	}
192
193	rdarg[idx] = 0;
194	str = rdarg;
195
196	/*
197	 *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
198	 *  e.g. initrd=3abfd@80010000.	 This is set up by the loader.
199	 */
200	for (tmp = str; *tmp != '@'; tmp++) {
201		if (!*tmp) {
202			goto fail;
203		}
204	}
205	*tmp = 0;
206	tmp++;
207	if (!*tmp) {
208		goto fail;
209	}
210	initrd_size = simple_strtoul(str, &endptr, 16);
211	if (*endptr) {
212		*(tmp-1) = '@';
213		goto fail;
214	}
215	*(tmp-1) = '@';
216	initrd_start = simple_strtoul(tmp, &endptr, 16);
217	if (*endptr) {
218		goto fail;
219	}
220	initrd_end = initrd_start + initrd_size;
221	printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
222	return 1;
223 fail:
224	printk("Bad initrd argument.  Disabling initrd\n");
225	initrd_start = 0;
226	initrd_end = 0;
227	return 1;
228}
229
230#endif
231
232extern struct plat_smp_ops sb_smp_ops;
233extern struct plat_smp_ops bcm1480_smp_ops;
234
235/*
236 * prom_init is called just after the cpu type is determined, from setup_arch()
237 */
238void __init prom_init(void)
239{
240	uint64_t cfe_ept, cfe_handle;
241	unsigned int cfe_eptseal;
242	int argc = fw_arg0;
243	char **envp = (char **) fw_arg2;
244	int *prom_vec = (int *) fw_arg3;
245
246	_machine_restart   = cfe_linux_restart;
247	_machine_halt	   = cfe_linux_halt;
248	pm_power_off = cfe_linux_halt;
249
250	/*
251	 * Check if a loader was used; if NOT, the 4 arguments are
252	 * what CFE gives us (handle, 0, EPT and EPTSEAL)
253	 */
254	if (argc < 0) {
255		cfe_handle = (uint64_t)(long)argc;
256		cfe_ept = (long)envp;
257		cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
258	} else {
259		if ((int32_t)(long)prom_vec < 0) {
260			/*
261			 * Old loader; all it gives us is the handle,
262			 * so use the "known" entrypoint and assume
263			 * the seal.
264			 */
265			cfe_handle = (uint64_t)(long)prom_vec;
266			cfe_ept = (uint64_t)((int32_t)0x9fc00500);
267			cfe_eptseal = CFE_EPTSEAL;
268		} else {
269			/*
270			 * Newer loaders bundle the handle/ept/eptseal
271			 * Note: prom_vec is in the loader's useg
272			 * which is still alive in the TLB.
273			 */
274			cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
275			cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
276			cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
277		}
278	}
279	if (cfe_eptseal != CFE_EPTSEAL) {
280		/* too early for panic to do any good */
281		printk("CFE's entrypoint seal doesn't match. Spinning.");
282		while (1) ;
283	}
284	cfe_init(cfe_handle, cfe_ept);
285	/*
286	 * Get the handle for (at least) prom_putchar, possibly for
287	 * boot console
288	 */
289	cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
290	if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
291		if (argc >= 0) {
292			/* The loader should have set the command line */
293			/* too early for panic to do any good */
294			printk("LINUX_CMDLINE not defined in cfe.");
295			while (1) ;
296		}
297	}
298
299#ifdef CONFIG_BLK_DEV_INITRD
300	{
301		char *ptr;
302		/* Need to find out early whether we've got an initrd.	So scan
303		   the list looking now */
304		for (ptr = arcs_cmdline; *ptr; ptr++) {
305			while (*ptr == ' ') {
306				ptr++;
307			}
308			if (!strncmp(ptr, "initrd=", 7)) {
309				initrd_setup(ptr+7);
310				break;
311			} else {
312				while (*ptr && (*ptr != ' ')) {
313					ptr++;
314				}
315			}
316		}
317	}
318#endif /* CONFIG_BLK_DEV_INITRD */
319
320	/* Not sure this is needed, but it's the safe way. */
321	arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;
322
323	prom_meminit();
324
325#if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
326	register_smp_ops(&sb_smp_ops);
327#endif
328#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
329	register_smp_ops(&bcm1480_smp_ops);
330#endif
331}
332
333void __init prom_free_prom_memory(void)
334{
335	/* Not sure what I'm supposed to do here.  Nothing, I think */
336}
337
338void prom_putchar(char c)
339{
340	int ret;
341
342	while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
343		;
344}
345