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/blkdev.h>
11#include <linux/memblock.h>
12#include <linux/pm.h>
13#include <linux/smp.h>
14
15#include <asm/bootinfo.h>
16#include <asm/reboot.h>
17#include <asm/setup.h>
18#include <asm/sibyte/board.h>
19#include <asm/smp-ops.h>
20
21#include <asm/fw/cfe/cfe_api.h>
22#include <asm/fw/cfe/cfe_error.h>
23
24/* Max ram addressable in 32-bit segments */
25#ifdef CONFIG_64BIT
26#define MAX_RAM_SIZE (~0ULL)
27#else
28#ifdef CONFIG_HIGHMEM
29#ifdef CONFIG_PHYS_ADDR_T_64BIT
30#define MAX_RAM_SIZE (~0ULL)
31#else
32#define MAX_RAM_SIZE (0xffffffffULL)
33#endif
34#else
35#define MAX_RAM_SIZE (0x1fffffffULL)
36#endif
37#endif
38
39#define SIBYTE_MAX_MEM_REGIONS 8
40phys_addr_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
41phys_addr_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
42unsigned int board_mem_region_count;
43
44int cfe_cons_handle;
45
46#ifdef CONFIG_BLK_DEV_INITRD
47extern unsigned long initrd_start, initrd_end;
48#endif
49
50static void __noreturn cfe_linux_exit(void *arg)
51{
52	int warm = *(int *)arg;
53
54	if (smp_processor_id()) {
55		static int reboot_smp;
56
57		/* Don't repeat the process from another CPU */
58		if (!reboot_smp) {
59			/* Get CPU 0 to do the cfe_exit */
60			reboot_smp = 1;
61			smp_call_function(cfe_linux_exit, arg, 0);
62		}
63	} else {
64		printk("Passing control back to CFE...\n");
65		cfe_exit(warm, 0);
66		printk("cfe_exit returned??\n");
67	}
68	while (1);
69}
70
71static void __noreturn cfe_linux_restart(char *command)
72{
73	static const int zero;
74
75	cfe_linux_exit((void *)&zero);
76}
77
78static void __noreturn cfe_linux_halt(void)
79{
80	static const int one = 1;
81
82	cfe_linux_exit((void *)&one);
83}
84
85static __init void prom_meminit(void)
86{
87	u64 addr, size, type; /* regardless of PHYS_ADDR_T_64BIT */
88	int mem_flags = 0;
89	unsigned int idx;
90	int rd_flag;
91#ifdef CONFIG_BLK_DEV_INITRD
92	unsigned long initrd_pstart;
93	unsigned long initrd_pend;
94
95	initrd_pstart = CPHYSADDR(initrd_start);
96	initrd_pend = CPHYSADDR(initrd_end);
97	if (initrd_start &&
98	    ((initrd_pstart > MAX_RAM_SIZE)
99	     || (initrd_pend > MAX_RAM_SIZE))) {
100		panic("initrd out of addressable memory");
101	}
102
103#endif /* INITRD */
104
105	for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
106	     idx++) {
107		rd_flag = 0;
108		if (type == CFE_MI_AVAILABLE) {
109			/*
110			 * See if this block contains (any portion of) the
111			 * ramdisk
112			 */
113#ifdef CONFIG_BLK_DEV_INITRD
114			if (initrd_start) {
115				if ((initrd_pstart > addr) &&
116				    (initrd_pstart < (addr + size))) {
117					memblock_add(addr,
118						     initrd_pstart - addr);
119					rd_flag = 1;
120				}
121				if ((initrd_pend > addr) &&
122				    (initrd_pend < (addr + size))) {
123					memblock_add(initrd_pend,
124						(addr + size) - initrd_pend);
125					rd_flag = 1;
126				}
127			}
128#endif
129			if (!rd_flag) {
130				if (addr > MAX_RAM_SIZE)
131					continue;
132				if (addr+size > MAX_RAM_SIZE)
133					size = MAX_RAM_SIZE - (addr+size) + 1;
134				/*
135				 * memcpy/__copy_user prefetch, which
136				 * will cause a bus error for
137				 * KSEG/KUSEG addrs not backed by RAM.
138				 * Hence, reserve some padding for the
139				 * prefetch distance.
140				 */
141				if (size > 512)
142					size -= 512;
143				memblock_add(addr, size);
144			}
145			board_mem_region_addrs[board_mem_region_count] = addr;
146			board_mem_region_sizes[board_mem_region_count] = size;
147			board_mem_region_count++;
148			if (board_mem_region_count ==
149			    SIBYTE_MAX_MEM_REGIONS) {
150				/*
151				 * Too many regions.  Need to configure more
152				 */
153				while(1);
154			}
155		}
156	}
157#ifdef CONFIG_BLK_DEV_INITRD
158	if (initrd_start) {
159		memblock_add(initrd_pstart, initrd_pend - initrd_pstart);
160		memblock_reserve(initrd_pstart, initrd_pend - initrd_pstart);
161	}
162#endif
163}
164
165#ifdef CONFIG_BLK_DEV_INITRD
166static int __init initrd_setup(char *str)
167{
168	char rdarg[64];
169	int idx;
170	char *tmp, *endptr;
171	unsigned long initrd_size;
172
173	/* Make a copy of the initrd argument so we can smash it up here */
174	for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
175		if (!str[idx] || (str[idx] == ' ')) break;
176		rdarg[idx] = str[idx];
177	}
178
179	rdarg[idx] = 0;
180	str = rdarg;
181
182	/*
183	 *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
184	 *  e.g. initrd=3abfd@80010000.	 This is set up by the loader.
185	 */
186	for (tmp = str; *tmp != '@'; tmp++) {
187		if (!*tmp) {
188			goto fail;
189		}
190	}
191	*tmp = 0;
192	tmp++;
193	if (!*tmp) {
194		goto fail;
195	}
196	initrd_size = simple_strtoul(str, &endptr, 16);
197	if (*endptr) {
198		*(tmp-1) = '@';
199		goto fail;
200	}
201	*(tmp-1) = '@';
202	initrd_start = simple_strtoul(tmp, &endptr, 16);
203	if (*endptr) {
204		goto fail;
205	}
206	initrd_end = initrd_start + initrd_size;
207	printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
208	return 1;
209 fail:
210	printk("Bad initrd argument.  Disabling initrd\n");
211	initrd_start = 0;
212	initrd_end = 0;
213	return 1;
214}
215
216#endif
217
218extern const struct plat_smp_ops sb_smp_ops;
219extern const struct plat_smp_ops bcm1480_smp_ops;
220
221/*
222 * prom_init is called just after the cpu type is determined, from setup_arch()
223 */
224void __init prom_init(void)
225{
226	uint64_t cfe_ept, cfe_handle;
227	unsigned int cfe_eptseal;
228	int argc = fw_arg0;
229	char **envp = (char **) fw_arg2;
230	int *prom_vec = (int *) fw_arg3;
231
232	_machine_restart   = cfe_linux_restart;
233	_machine_halt	   = cfe_linux_halt;
234	pm_power_off = cfe_linux_halt;
235
236	/*
237	 * Check if a loader was used; if NOT, the 4 arguments are
238	 * what CFE gives us (handle, 0, EPT and EPTSEAL)
239	 */
240	if (argc < 0) {
241		cfe_handle = (uint64_t)(long)argc;
242		cfe_ept = (long)envp;
243		cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
244	} else {
245		if ((int32_t)(long)prom_vec < 0) {
246			/*
247			 * Old loader; all it gives us is the handle,
248			 * so use the "known" entrypoint and assume
249			 * the seal.
250			 */
251			cfe_handle = (uint64_t)(long)prom_vec;
252			cfe_ept = (uint64_t)((int32_t)0x9fc00500);
253			cfe_eptseal = CFE_EPTSEAL;
254		} else {
255			/*
256			 * Newer loaders bundle the handle/ept/eptseal
257			 * Note: prom_vec is in the loader's useg
258			 * which is still alive in the TLB.
259			 */
260			cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
261			cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
262			cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
263		}
264	}
265	if (cfe_eptseal != CFE_EPTSEAL) {
266		/* too early for panic to do any good */
267		printk("CFE's entrypoint seal doesn't match. Spinning.");
268		while (1) ;
269	}
270	cfe_init(cfe_handle, cfe_ept);
271	/*
272	 * Get the handle for (at least) prom_putchar, possibly for
273	 * boot console
274	 */
275	cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
276	if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
277		if (argc >= 0) {
278			/* The loader should have set the command line */
279			/* too early for panic to do any good */
280			printk("LINUX_CMDLINE not defined in cfe.");
281			while (1) ;
282		}
283	}
284
285#ifdef CONFIG_BLK_DEV_INITRD
286	{
287		char *ptr;
288		/* Need to find out early whether we've got an initrd.	So scan
289		   the list looking now */
290		for (ptr = arcs_cmdline; *ptr; ptr++) {
291			while (*ptr == ' ') {
292				ptr++;
293			}
294			if (!strncmp(ptr, "initrd=", 7)) {
295				initrd_setup(ptr+7);
296				break;
297			} else {
298				while (*ptr && (*ptr != ' ')) {
299					ptr++;
300				}
301			}
302		}
303	}
304#endif /* CONFIG_BLK_DEV_INITRD */
305
306	/* Not sure this is needed, but it's the safe way. */
307	arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;
308
309	prom_meminit();
310
311#if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
312	register_smp_ops(&sb_smp_ops);
313#endif
314#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
315	register_smp_ops(&bcm1480_smp_ops);
316#endif
317}
318
319void __init prom_free_prom_memory(void)
320{
321	/* Not sure what I'm supposed to do here.  Nothing, I think */
322}
323
324void prom_putchar(char c)
325{
326	int ret;
327
328	while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
329		;
330}
331