xref: /openbmc/u-boot/arch/powerpc/lib/bootm.c (revision 4a2b2724)
1 /*
2  * (C) Copyright 2008 Semihalf
3  *
4  * (C) Copyright 2000-2006
5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
6  *
7  * SPDX-License-Identifier:	GPL-2.0+
8  */
9 
10 
11 #include <common.h>
12 #include <watchdog.h>
13 #include <command.h>
14 #include <image.h>
15 #include <malloc.h>
16 #include <u-boot/zlib.h>
17 #include <bzlib.h>
18 #include <environment.h>
19 #include <asm/byteorder.h>
20 #include <asm/mp.h>
21 
22 #if defined(CONFIG_OF_LIBFDT)
23 #include <libfdt.h>
24 #include <fdt_support.h>
25 #endif
26 
27 #ifdef CONFIG_SYS_INIT_RAM_LOCK
28 #include <asm/cache.h>
29 #endif
30 
31 DECLARE_GLOBAL_DATA_PTR;
32 
33 static ulong get_sp (void);
34 extern void ft_fixup_num_cores(void *blob);
35 static void set_clocks_in_mhz (bd_t *kbd);
36 
37 #ifndef CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
38 #define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE	(768*1024*1024)
39 #endif
40 
41 int arch_fixup_fdt(void *blob)
42 {
43 	return 0;
44 }
45 
46 static void boot_jump_linux(bootm_headers_t *images)
47 {
48 	void	(*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
49 			  ulong r7, ulong r8, ulong r9);
50 #ifdef CONFIG_OF_LIBFDT
51 	char *of_flat_tree = images->ft_addr;
52 #endif
53 
54 	kernel = (void (*)(bd_t *, ulong, ulong, ulong,
55 			   ulong, ulong, ulong))images->ep;
56 	debug ("## Transferring control to Linux (at address %08lx) ...\n",
57 		(ulong)kernel);
58 
59 	bootstage_mark(BOOTSTAGE_ID_RUN_OS);
60 
61 #ifdef CONFIG_BOOTSTAGE_FDT
62 	bootstage_fdt_add_report();
63 #endif
64 #ifdef CONFIG_BOOTSTAGE_REPORT
65 	bootstage_report();
66 #endif
67 
68 #if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
69 	unlock_ram_in_cache();
70 #endif
71 
72 #if defined(CONFIG_OF_LIBFDT)
73 	if (of_flat_tree) {	/* device tree; boot new style */
74 		/*
75 		 * Linux Kernel Parameters (passing device tree):
76 		 *   r3: pointer to the fdt
77 		 *   r4: 0
78 		 *   r5: 0
79 		 *   r6: epapr magic
80 		 *   r7: size of IMA in bytes
81 		 *   r8: 0
82 		 *   r9: 0
83 		 */
84 		debug ("   Booting using OF flat tree...\n");
85 		WATCHDOG_RESET ();
86 		(*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
87 			   getenv_bootm_mapsize(), 0, 0);
88 		/* does not return */
89 	} else
90 #endif
91 	{
92 		/*
93 		 * Linux Kernel Parameters (passing board info data):
94 		 *   r3: ptr to board info data
95 		 *   r4: initrd_start or 0 if no initrd
96 		 *   r5: initrd_end - unused if r4 is 0
97 		 *   r6: Start of command line string
98 		 *   r7: End   of command line string
99 		 *   r8: 0
100 		 *   r9: 0
101 		 */
102 		ulong cmd_start = images->cmdline_start;
103 		ulong cmd_end = images->cmdline_end;
104 		ulong initrd_start = images->initrd_start;
105 		ulong initrd_end = images->initrd_end;
106 		bd_t *kbd = images->kbd;
107 
108 		debug ("   Booting using board info...\n");
109 		WATCHDOG_RESET ();
110 		(*kernel) (kbd, initrd_start, initrd_end,
111 			   cmd_start, cmd_end, 0, 0);
112 		/* does not return */
113 	}
114 	return ;
115 }
116 
117 void arch_lmb_reserve(struct lmb *lmb)
118 {
119 	phys_size_t bootm_size;
120 	ulong size, sp, bootmap_base;
121 
122 	bootmap_base = getenv_bootm_low();
123 	bootm_size = getenv_bootm_size();
124 
125 #ifdef DEBUG
126 	if (((u64)bootmap_base + bootm_size) >
127 	    (CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
128 		puts("WARNING: bootm_low + bootm_size exceed total memory\n");
129 	if ((bootmap_base + bootm_size) > get_effective_memsize())
130 		puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
131 #endif
132 
133 	size = min(bootm_size, get_effective_memsize());
134 	size = min(size, (ulong)CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
135 
136 	if (size < bootm_size) {
137 		ulong base = bootmap_base + size;
138 		printf("WARNING: adjusting available memory to %lx\n", size);
139 		lmb_reserve(lmb, base, bootm_size - size);
140 	}
141 
142 	/*
143 	 * Booting a (Linux) kernel image
144 	 *
145 	 * Allocate space for command line and board info - the
146 	 * address should be as high as possible within the reach of
147 	 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
148 	 * memory, which means far enough below the current stack
149 	 * pointer.
150 	 */
151 	sp = get_sp();
152 	debug ("## Current stack ends at 0x%08lx\n", sp);
153 
154 	/* adjust sp by 4K to be safe */
155 	sp -= 4096;
156 	lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
157 
158 #ifdef CONFIG_MP
159 	cpu_mp_lmb_reserve(lmb);
160 #endif
161 
162 	return ;
163 }
164 
165 static void boot_prep_linux(bootm_headers_t *images)
166 {
167 #ifdef CONFIG_MP
168 	/*
169 	 * if we are MP make sure to flush the device tree so any changes are
170 	 * made visibile to all other cores.  In AMP boot scenarios the cores
171 	 * might not be HW cache coherent with each other.
172 	 */
173 	flush_cache((unsigned long)images->ft_addr, images->ft_len);
174 #endif
175 }
176 
177 static int boot_cmdline_linux(bootm_headers_t *images)
178 {
179 	ulong of_size = images->ft_len;
180 	struct lmb *lmb = &images->lmb;
181 	ulong *cmd_start = &images->cmdline_start;
182 	ulong *cmd_end = &images->cmdline_end;
183 
184 	int ret = 0;
185 
186 	if (!of_size) {
187 		/* allocate space and init command line */
188 		ret = boot_get_cmdline (lmb, cmd_start, cmd_end);
189 		if (ret) {
190 			puts("ERROR with allocation of cmdline\n");
191 			return ret;
192 		}
193 	}
194 
195 	return ret;
196 }
197 
198 static int boot_bd_t_linux(bootm_headers_t *images)
199 {
200 	ulong of_size = images->ft_len;
201 	struct lmb *lmb = &images->lmb;
202 	bd_t **kbd = &images->kbd;
203 
204 	int ret = 0;
205 
206 	if (!of_size) {
207 		/* allocate space for kernel copy of board info */
208 		ret = boot_get_kbd (lmb, kbd);
209 		if (ret) {
210 			puts("ERROR with allocation of kernel bd\n");
211 			return ret;
212 		}
213 		set_clocks_in_mhz(*kbd);
214 	}
215 
216 	return ret;
217 }
218 
219 static int boot_body_linux(bootm_headers_t *images)
220 {
221 	int ret;
222 
223 	/* allocate space for kernel copy of board info */
224 	ret = boot_bd_t_linux(images);
225 	if (ret)
226 		return ret;
227 
228 	ret = image_setup_linux(images);
229 	if (ret)
230 		return ret;
231 
232 	return 0;
233 }
234 
235 noinline
236 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
237 {
238 	int	ret;
239 
240 	if (flag & BOOTM_STATE_OS_CMDLINE) {
241 		boot_cmdline_linux(images);
242 		return 0;
243 	}
244 
245 	if (flag & BOOTM_STATE_OS_BD_T) {
246 		boot_bd_t_linux(images);
247 		return 0;
248 	}
249 
250 	if (flag & BOOTM_STATE_OS_PREP) {
251 		boot_prep_linux(images);
252 		return 0;
253 	}
254 
255 	boot_prep_linux(images);
256 	ret = boot_body_linux(images);
257 	if (ret)
258 		return ret;
259 	boot_jump_linux(images);
260 
261 	return 0;
262 }
263 
264 static ulong get_sp (void)
265 {
266 	ulong sp;
267 
268 	asm( "mr %0,1": "=r"(sp) : );
269 	return sp;
270 }
271 
272 static void set_clocks_in_mhz (bd_t *kbd)
273 {
274 	char	*s;
275 
276 	if ((s = getenv ("clocks_in_mhz")) != NULL) {
277 		/* convert all clock information to MHz */
278 		kbd->bi_intfreq /= 1000000L;
279 		kbd->bi_busfreq /= 1000000L;
280 #if defined(CONFIG_CPM2)
281 		kbd->bi_cpmfreq /= 1000000L;
282 		kbd->bi_brgfreq /= 1000000L;
283 		kbd->bi_sccfreq /= 1000000L;
284 		kbd->bi_vco	/= 1000000L;
285 #endif
286 #if defined(CONFIG_MPC5xxx)
287 		kbd->bi_ipbfreq /= 1000000L;
288 		kbd->bi_pcifreq /= 1000000L;
289 #endif /* CONFIG_MPC5xxx */
290 	}
291 }
292 
293 #if defined(CONFIG_BOOTM_VXWORKS)
294 void boot_prep_vxworks(bootm_headers_t *images)
295 {
296 #if defined(CONFIG_OF_LIBFDT)
297 	int off;
298 	u64 base, size;
299 
300 	if (!images->ft_addr)
301 		return;
302 
303 	base = (u64)gd->bd->bi_memstart;
304 	size = (u64)gd->bd->bi_memsize;
305 
306 	off = fdt_path_offset(images->ft_addr, "/memory");
307 	if (off < 0)
308 		fdt_fixup_memory(images->ft_addr, base, size);
309 
310 #if defined(CONFIG_MP)
311 #if defined(CONFIG_MPC85xx)
312 	ft_fixup_cpu(images->ft_addr, base + size);
313 	ft_fixup_num_cores(images->ft_addr);
314 #elif defined(CONFIG_MPC86xx)
315 	off = fdt_add_mem_rsv(images->ft_addr,
316 			determine_mp_bootpg(NULL), (u64)4096);
317 	if (off < 0)
318 		printf("## WARNING %s: %s\n", __func__, fdt_strerror(off));
319 	ft_fixup_num_cores(images->ft_addr);
320 #endif
321 	flush_cache((unsigned long)images->ft_addr, images->ft_len);
322 #endif
323 #endif
324 }
325 
326 void boot_jump_vxworks(bootm_headers_t *images)
327 {
328 	/* PowerPC VxWorks boot interface conforms to the ePAPR standard
329 	 * general purpuse registers:
330 	 *
331 	 *	r3: Effective address of the device tree image
332 	 *	r4: 0
333 	 *	r5: 0
334 	 *	r6: ePAPR magic value
335 	 *	r7: shall be the size of the boot IMA in bytes
336 	 *	r8: 0
337 	 *	r9: 0
338 	 *	TCR: WRC = 0, no watchdog timer reset will occur
339 	 */
340 	WATCHDOG_RESET();
341 
342 	((void (*)(void *, ulong, ulong, ulong,
343 		ulong, ulong, ulong))images->ep)(images->ft_addr,
344 		0, 0, EPAPR_MAGIC, getenv_bootm_mapsize(), 0, 0);
345 }
346 #endif
347