2 * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
3 * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
4 * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
12 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
14 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
15 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
16 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
17 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
18 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
19 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
20 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <linux/init.h>
28 #include <linux/types.h>
29 #include <linux/kernel.h>
30 #include <linux/spinlock.h>
31 #include <linux/smp.h>
32 #include <asm/bootinfo.h>
33 #include <asm/fw/cfe/cfe_api.h>
34 #include <asm/fw/cfe/cfe_error.h>
36 #include <bcm47xx_board.h>
38 static int cfe_cons_handle
;
40 static u16
get_chip_id(void)
42 switch (bcm47xx_bus_type
) {
43 #ifdef CONFIG_BCM47XX_SSB
44 case BCM47XX_BUS_TYPE_SSB
:
45 return bcm47xx_bus
.ssb
.chip_id
;
47 #ifdef CONFIG_BCM47XX_BCMA
48 case BCM47XX_BUS_TYPE_BCMA
:
49 return bcm47xx_bus
.bcma
.bus
.chipinfo
.id
;
55 const char *get_system_type(void)
58 u16 chip_id
= get_chip_id();
60 snprintf(buf
, sizeof(buf
),
61 (chip_id
> 0x9999) ? "Broadcom BCM%d (%s)" :
62 "Broadcom BCM%04X (%s)",
63 chip_id
, bcm47xx_board_get_name());
68 void prom_putchar(char c
)
70 while (cfe_write(cfe_cons_handle
, &c
, 1) == 0)
74 static __init
void prom_init_cfe(void)
80 char **envp
= (char **) fw_arg2
;
81 int *prom_vec
= (int *) fw_arg3
;
84 * Check if a loader was used; if NOT, the 4 arguments are
85 * what CFE gives us (handle, 0, EPT and EPTSEAL)
88 cfe_handle
= (uint32_t)argc
;
89 cfe_ept
= (uint32_t)envp
;
90 cfe_eptseal
= (uint32_t)prom_vec
;
92 if ((int)prom_vec
< 0) {
94 * Old loader; all it gives us is the handle,
95 * so use the "known" entrypoint and assume
98 cfe_handle
= (uint32_t)prom_vec
;
100 cfe_eptseal
= CFE_EPTSEAL
;
103 * Newer loaders bundle the handle/ept/eptseal
104 * Note: prom_vec is in the loader's useg
105 * which is still alive in the TLB.
107 cfe_handle
= prom_vec
[0];
108 cfe_ept
= prom_vec
[2];
109 cfe_eptseal
= prom_vec
[3];
113 if (cfe_eptseal
!= CFE_EPTSEAL
) {
114 /* too early for panic to do any good */
115 printk(KERN_ERR
"CFE's entrypoint seal doesn't match.");
119 cfe_init(cfe_handle
, cfe_ept
);
122 static __init
void prom_init_console(void)
124 /* Initialize CFE console */
125 cfe_cons_handle
= cfe_getstdhandle(CFE_STDHANDLE_CONSOLE
);
128 static __init
void prom_init_cmdline(void)
130 static char buf
[COMMAND_LINE_SIZE
] __initdata
;
132 /* Get the kernel command line from CFE */
133 if (cfe_getenv("LINUX_CMDLINE", buf
, COMMAND_LINE_SIZE
) >= 0) {
134 buf
[COMMAND_LINE_SIZE
- 1] = 0;
135 strcpy(arcs_cmdline
, buf
);
138 /* Force a console handover by adding a console= argument if needed,
139 * as CFE is not available anymore later in the boot process. */
140 if ((strstr(arcs_cmdline
, "console=")) == NULL
) {
141 /* Try to read the default serial port used by CFE */
142 if ((cfe_getenv("BOOT_CONSOLE", buf
, COMMAND_LINE_SIZE
) < 0)
143 || (strncmp("uart", buf
, 4)))
144 /* Default to uart0 */
145 strcpy(buf
, "uart0");
147 /* Compute the new command line */
148 snprintf(arcs_cmdline
, COMMAND_LINE_SIZE
, "%s console=ttyS%c,115200",
149 arcs_cmdline
, buf
[4]);
153 static __init
void prom_init_mem(void)
158 struct cpuinfo_mips
*c
= ¤t_cpu_data
;
160 /* Figure out memory size by finding aliases.
162 * We should theoretically use the mapping from CFE using cfe_enummem().
163 * However as the BCM47XX is mostly used on low-memory systems, we
164 * want to reuse the memory used by CFE (around 4MB). That means cfe_*
165 * functions stop to work at some point during the boot, we should only
166 * call them at the beginning of the boot.
168 * BCM47XX uses 128MB for addressing the ram, if the system contains
169 * less that that amount of ram it remaps the ram more often into the
171 * Accessing memory after 128MB will cause an exception.
172 * max contains the biggest possible address supported by the platform.
173 * If the method wants to try something above we assume 128MB ram.
175 off
= (unsigned long)prom_init
;
176 max
= off
| ((128 << 20) - 1);
177 for (mem
= (1 << 20); mem
< (128 << 20); mem
+= (1 << 20)) {
178 if ((off
+ mem
) > max
) {
180 printk(KERN_DEBUG
"assume 128MB RAM\n");
183 if (!memcmp(prom_init
, prom_init
+ mem
, 32))
187 /* Ignoring the last page when ddr size is 128M. Cached
188 * accesses to last page is causing the processor to prefetch
189 * using address above 128M stepping out of the ddr address
192 if (c
->cputype
== CPU_74K
&& (mem
== (128 << 20)))
195 add_memory_region(0, mem
, BOOT_MEM_RAM
);
198 void __init
prom_init(void)
206 void __init
prom_free_prom_memory(void)
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