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Aurelien Jarno1c0c13e2007-09-25 15:40:12 +02001/*
2 * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
Aurelien Jarno25e5fb92007-09-25 15:41:24 +02003 * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
Hauke Mehrtensc47cc202012-10-03 11:34:17 +00004 * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
Aurelien Jarno1c0c13e2007-09-25 15:40:12 +02005 *
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.
10 *
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.
21 *
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.
25 */
26
27#include <linux/init.h>
Aurelien Jarno25e5fb92007-09-25 15:41:24 +020028#include <linux/types.h>
29#include <linux/kernel.h>
30#include <linux/spinlock.h>
Hauke Mehrtensd3dce3d2012-10-03 11:34:16 +000031#include <linux/smp.h>
Aurelien Jarno1c0c13e2007-09-25 15:40:12 +020032#include <asm/bootinfo.h>
Aurelien Jarno25e5fb92007-09-25 15:41:24 +020033#include <asm/fw/cfe/cfe_api.h>
34#include <asm/fw/cfe/cfe_error.h>
35
36static int cfe_cons_handle;
Aurelien Jarno1c0c13e2007-09-25 15:40:12 +020037
38const char *get_system_type(void)
39{
40 return "Broadcom BCM47XX";
41}
42
Aurelien Jarno25e5fb92007-09-25 15:41:24 +020043void prom_putchar(char c)
44{
45 while (cfe_write(cfe_cons_handle, &c, 1) == 0)
46 ;
47}
48
49static __init void prom_init_cfe(void)
50{
51 uint32_t cfe_ept;
52 uint32_t cfe_handle;
53 uint32_t cfe_eptseal;
54 int argc = fw_arg0;
55 char **envp = (char **) fw_arg2;
56 int *prom_vec = (int *) fw_arg3;
57
58 /*
59 * Check if a loader was used; if NOT, the 4 arguments are
60 * what CFE gives us (handle, 0, EPT and EPTSEAL)
61 */
62 if (argc < 0) {
63 cfe_handle = (uint32_t)argc;
64 cfe_ept = (uint32_t)envp;
65 cfe_eptseal = (uint32_t)prom_vec;
66 } else {
67 if ((int)prom_vec < 0) {
68 /*
69 * Old loader; all it gives us is the handle,
70 * so use the "known" entrypoint and assume
71 * the seal.
72 */
73 cfe_handle = (uint32_t)prom_vec;
74 cfe_ept = 0xBFC00500;
75 cfe_eptseal = CFE_EPTSEAL;
76 } else {
77 /*
78 * Newer loaders bundle the handle/ept/eptseal
79 * Note: prom_vec is in the loader's useg
80 * which is still alive in the TLB.
81 */
82 cfe_handle = prom_vec[0];
83 cfe_ept = prom_vec[2];
84 cfe_eptseal = prom_vec[3];
85 }
86 }
87
88 if (cfe_eptseal != CFE_EPTSEAL) {
89 /* too early for panic to do any good */
90 printk(KERN_ERR "CFE's entrypoint seal doesn't match.");
91 while (1) ;
92 }
93
94 cfe_init(cfe_handle, cfe_ept);
95}
96
97static __init void prom_init_console(void)
98{
99 /* Initialize CFE console */
100 cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
101}
102
103static __init void prom_init_cmdline(void)
104{
Dmitri Vorobiev7580c9c2009-10-13 23:43:24 +0300105 static char buf[COMMAND_LINE_SIZE] __initdata;
Aurelien Jarno25e5fb92007-09-25 15:41:24 +0200106
107 /* Get the kernel command line from CFE */
Dmitri Vorobiev7580c9c2009-10-13 23:43:24 +0300108 if (cfe_getenv("LINUX_CMDLINE", buf, COMMAND_LINE_SIZE) >= 0) {
109 buf[COMMAND_LINE_SIZE - 1] = 0;
Aurelien Jarno25e5fb92007-09-25 15:41:24 +0200110 strcpy(arcs_cmdline, buf);
111 }
112
113 /* Force a console handover by adding a console= argument if needed,
114 * as CFE is not available anymore later in the boot process. */
115 if ((strstr(arcs_cmdline, "console=")) == NULL) {
116 /* Try to read the default serial port used by CFE */
Dmitri Vorobiev7580c9c2009-10-13 23:43:24 +0300117 if ((cfe_getenv("BOOT_CONSOLE", buf, COMMAND_LINE_SIZE) < 0)
Aurelien Jarno25e5fb92007-09-25 15:41:24 +0200118 || (strncmp("uart", buf, 4)))
119 /* Default to uart0 */
120 strcpy(buf, "uart0");
121
122 /* Compute the new command line */
Dmitri Vorobiev7580c9c2009-10-13 23:43:24 +0300123 snprintf(arcs_cmdline, COMMAND_LINE_SIZE, "%s console=ttyS%c,115200",
Aurelien Jarno25e5fb92007-09-25 15:41:24 +0200124 arcs_cmdline, buf[4]);
125 }
126}
127
128static __init void prom_init_mem(void)
Aurelien Jarno1c0c13e2007-09-25 15:40:12 +0200129{
130 unsigned long mem;
Hauke Mehrtensaec92222010-07-27 22:12:43 +0200131 unsigned long max;
Hauke Mehrtensc47cc202012-10-03 11:34:17 +0000132 unsigned long off;
Hauke Mehrtensd3dce3d2012-10-03 11:34:16 +0000133 struct cpuinfo_mips *c = &current_cpu_data;
Aurelien Jarno1c0c13e2007-09-25 15:40:12 +0200134
Aurelien Jarno25e5fb92007-09-25 15:41:24 +0200135 /* Figure out memory size by finding aliases.
136 *
137 * We should theoretically use the mapping from CFE using cfe_enummem().
138 * However as the BCM47XX is mostly used on low-memory systems, we
139 * want to reuse the memory used by CFE (around 4MB). That means cfe_*
140 * functions stop to work at some point during the boot, we should only
141 * call them at the beginning of the boot.
Hauke Mehrtensaec92222010-07-27 22:12:43 +0200142 *
143 * BCM47XX uses 128MB for addressing the ram, if the system contains
144 * less that that amount of ram it remaps the ram more often into the
145 * available space.
146 * Accessing memory after 128MB will cause an exception.
147 * max contains the biggest possible address supported by the platform.
148 * If the method wants to try something above we assume 128MB ram.
Aurelien Jarno25e5fb92007-09-25 15:41:24 +0200149 */
Hauke Mehrtensc47cc202012-10-03 11:34:17 +0000150 off = (unsigned long)prom_init;
151 max = off | ((128 << 20) - 1);
Aurelien Jarno1c0c13e2007-09-25 15:40:12 +0200152 for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) {
Hauke Mehrtensc47cc202012-10-03 11:34:17 +0000153 if ((off + mem) > max) {
Hauke Mehrtensaec92222010-07-27 22:12:43 +0200154 mem = (128 << 20);
155 printk(KERN_DEBUG "assume 128MB RAM\n");
156 break;
157 }
Hauke Mehrtensc47cc202012-10-03 11:34:17 +0000158 if (!memcmp(prom_init, prom_init + mem, 32))
Aurelien Jarno1c0c13e2007-09-25 15:40:12 +0200159 break;
160 }
161
Hauke Mehrtensd3dce3d2012-10-03 11:34:16 +0000162 /* Ignoring the last page when ddr size is 128M. Cached
163 * accesses to last page is causing the processor to prefetch
164 * using address above 128M stepping out of the ddr address
165 * space.
166 */
167 if (c->cputype == CPU_74K && (mem == (128 << 20)))
168 mem -= 0x1000;
169
Aurelien Jarno1c0c13e2007-09-25 15:40:12 +0200170 add_memory_region(0, mem, BOOT_MEM_RAM);
171}
172
Aurelien Jarno25e5fb92007-09-25 15:41:24 +0200173void __init prom_init(void)
174{
175 prom_init_cfe();
176 prom_init_console();
177 prom_init_cmdline();
178 prom_init_mem();
179}
180
Aurelien Jarno1c0c13e2007-09-25 15:40:12 +0200181void __init prom_free_prom_memory(void)
182{
183}