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1c0c13eb AJ |
1 | /* |
2 | * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org> | |
25e5fb97 | 3 | * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net> |
1c0c13eb AJ |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the | |
7 | * Free Software Foundation; either version 2 of the License, or (at your | |
8 | * option) any later version. | |
9 | * | |
10 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
11 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
12 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
13 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
14 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
15 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
16 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
17 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
18 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
19 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License along | |
22 | * with this program; if not, write to the Free Software Foundation, Inc., | |
23 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/init.h> | |
25e5fb97 AJ |
27 | #include <linux/types.h> |
28 | #include <linux/kernel.h> | |
29 | #include <linux/spinlock.h> | |
1c0c13eb | 30 | #include <asm/bootinfo.h> |
25e5fb97 AJ |
31 | #include <asm/fw/cfe/cfe_api.h> |
32 | #include <asm/fw/cfe/cfe_error.h> | |
33 | ||
34 | static int cfe_cons_handle; | |
1c0c13eb AJ |
35 | |
36 | const char *get_system_type(void) | |
37 | { | |
38 | return "Broadcom BCM47XX"; | |
39 | } | |
40 | ||
25e5fb97 AJ |
41 | void prom_putchar(char c) |
42 | { | |
43 | while (cfe_write(cfe_cons_handle, &c, 1) == 0) | |
44 | ; | |
45 | } | |
46 | ||
47 | static __init void prom_init_cfe(void) | |
48 | { | |
49 | uint32_t cfe_ept; | |
50 | uint32_t cfe_handle; | |
51 | uint32_t cfe_eptseal; | |
52 | int argc = fw_arg0; | |
53 | char **envp = (char **) fw_arg2; | |
54 | int *prom_vec = (int *) fw_arg3; | |
55 | ||
56 | /* | |
57 | * Check if a loader was used; if NOT, the 4 arguments are | |
58 | * what CFE gives us (handle, 0, EPT and EPTSEAL) | |
59 | */ | |
60 | if (argc < 0) { | |
61 | cfe_handle = (uint32_t)argc; | |
62 | cfe_ept = (uint32_t)envp; | |
63 | cfe_eptseal = (uint32_t)prom_vec; | |
64 | } else { | |
65 | if ((int)prom_vec < 0) { | |
66 | /* | |
67 | * Old loader; all it gives us is the handle, | |
68 | * so use the "known" entrypoint and assume | |
69 | * the seal. | |
70 | */ | |
71 | cfe_handle = (uint32_t)prom_vec; | |
72 | cfe_ept = 0xBFC00500; | |
73 | cfe_eptseal = CFE_EPTSEAL; | |
74 | } else { | |
75 | /* | |
76 | * Newer loaders bundle the handle/ept/eptseal | |
77 | * Note: prom_vec is in the loader's useg | |
78 | * which is still alive in the TLB. | |
79 | */ | |
80 | cfe_handle = prom_vec[0]; | |
81 | cfe_ept = prom_vec[2]; | |
82 | cfe_eptseal = prom_vec[3]; | |
83 | } | |
84 | } | |
85 | ||
86 | if (cfe_eptseal != CFE_EPTSEAL) { | |
87 | /* too early for panic to do any good */ | |
88 | printk(KERN_ERR "CFE's entrypoint seal doesn't match."); | |
89 | while (1) ; | |
90 | } | |
91 | ||
92 | cfe_init(cfe_handle, cfe_ept); | |
93 | } | |
94 | ||
95 | static __init void prom_init_console(void) | |
96 | { | |
97 | /* Initialize CFE console */ | |
98 | cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE); | |
99 | } | |
100 | ||
101 | static __init void prom_init_cmdline(void) | |
102 | { | |
7580c9c3 | 103 | static char buf[COMMAND_LINE_SIZE] __initdata; |
25e5fb97 AJ |
104 | |
105 | /* Get the kernel command line from CFE */ | |
7580c9c3 DV |
106 | if (cfe_getenv("LINUX_CMDLINE", buf, COMMAND_LINE_SIZE) >= 0) { |
107 | buf[COMMAND_LINE_SIZE - 1] = 0; | |
25e5fb97 AJ |
108 | strcpy(arcs_cmdline, buf); |
109 | } | |
110 | ||
111 | /* Force a console handover by adding a console= argument if needed, | |
112 | * as CFE is not available anymore later in the boot process. */ | |
113 | if ((strstr(arcs_cmdline, "console=")) == NULL) { | |
114 | /* Try to read the default serial port used by CFE */ | |
7580c9c3 | 115 | if ((cfe_getenv("BOOT_CONSOLE", buf, COMMAND_LINE_SIZE) < 0) |
25e5fb97 AJ |
116 | || (strncmp("uart", buf, 4))) |
117 | /* Default to uart0 */ | |
118 | strcpy(buf, "uart0"); | |
119 | ||
120 | /* Compute the new command line */ | |
7580c9c3 | 121 | snprintf(arcs_cmdline, COMMAND_LINE_SIZE, "%s console=ttyS%c,115200", |
25e5fb97 AJ |
122 | arcs_cmdline, buf[4]); |
123 | } | |
124 | } | |
125 | ||
126 | static __init void prom_init_mem(void) | |
1c0c13eb AJ |
127 | { |
128 | unsigned long mem; | |
129 | ||
25e5fb97 AJ |
130 | /* Figure out memory size by finding aliases. |
131 | * | |
132 | * We should theoretically use the mapping from CFE using cfe_enummem(). | |
133 | * However as the BCM47XX is mostly used on low-memory systems, we | |
134 | * want to reuse the memory used by CFE (around 4MB). That means cfe_* | |
135 | * functions stop to work at some point during the boot, we should only | |
136 | * call them at the beginning of the boot. | |
137 | */ | |
1c0c13eb AJ |
138 | for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) { |
139 | if (*(unsigned long *)((unsigned long)(prom_init) + mem) == | |
140 | *(unsigned long *)(prom_init)) | |
141 | break; | |
142 | } | |
143 | ||
84a6fcb3 HM |
144 | /* Ignoring the last page when ddr size is 128M. Cached |
145 | * accesses to last page is causing the processor to prefetch | |
146 | * using address above 128M stepping out of the ddr address | |
147 | * space. | |
148 | */ | |
149 | if (mem == 0x8000000) | |
150 | mem -= 0x1000; | |
151 | ||
1c0c13eb AJ |
152 | add_memory_region(0, mem, BOOT_MEM_RAM); |
153 | } | |
154 | ||
25e5fb97 AJ |
155 | void __init prom_init(void) |
156 | { | |
157 | prom_init_cfe(); | |
158 | prom_init_console(); | |
159 | prom_init_cmdline(); | |
160 | prom_init_mem(); | |
161 | } | |
162 | ||
1c0c13eb AJ |
163 | void __init prom_free_prom_memory(void) |
164 | { | |
165 | } | |
25e5fb97 | 166 |